• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for manufacturing a screw rotor (1), wherein at least the following steps are performed: clamping the workpiece (14) with the outer diameter of the rotor body (2) in a machine tool (27); - drill center holes (13) in the end faces (12a, 12b) of the journals (3a, 3b); - clamping the workpiece (14) with the center holes (13); - roughly turning a clamping surface (16) on a journal 15 (3a); clamping the workpiece (14) with the aforementioned clamping surface (16) performing rough turning and profile milling operations of the rotor body (2) and the shaft journals (3a, 4b); 20 - perform fine profile grinding, profile milling and turning operations of the rotor body and the shaft journals (3a, 3b); all steps being performed with the same machine tool (27). 25 Figure: 9.
    公开号:BE1022226B1
    申请号:E2014/0433
    申请日:2014-06-06
    公开日:2016-03-03
    发明作者:
    申请人:Atlas Copco Airpower, Naamloze Vennootschap；
    IPC主号:
    专利说明:

    Method and machine tool for manufacturing a screw rotor for a compressor, an expander or the like.
    The present invention relates to a method for manufacturing a screw rotor for a compressor, an expander or the like.
    More specifically, the invention is very suitable for manufacturing a screw rotor of a screw compressor, which are also known as the lysholm compressor.
    It is known that a screw rotor of a compressor consists of a helical rotor body and a rotor shaft with two journals projecting radially with respect to the end faces of the rotor body.
    The rotor body has a complex profile, the contours of this rotor body being encased between two end faces and within an outer cylinder shell defining the outer diameter of the rotor body.
    The spindles are provided with different parts, such as, for example, a part for driving the spindle, parts for applying bearings, parts for applying a seal and so on. Thus, the journals usually have different cylindrical portions with varying shaft diameters. End faces are provided between the various cylindrical sections that can serve as a stop surface.
    The complex shape has the consequence that many different operations are needed to manufacture a rotor, such as milling, grinding and turning.
    Traditional methods for manufacturing a rotor therefore also take place in two or more phases or processing steps.
    A first set of operations can be done on a first rotary milling machine.
    This first set of operations comprises: - face milling, drilling, tapping and center drilling of the shaft ends; - pre-turning the shaft journals, the end faces of the rotor body and along the outer diameter of the rotor body; - the rough profile milling of the rotor body with a form mill; - the rotation of the spindles, the end faces of the rotor body and along the outer diameter of the rotor body with a more accurate tolerance.
    A second set of operations can be done on a second machine, namely an axis grinder.
    The axis journals are processed during this second set of operations, for example by means of a corundum or CBN (Cubic Boron Nitride) circular grinding wheel.
    Finally, the profile of the rotor body is finished on a third machine, namely a profile grinding machine.
    Herewith a third set of operations is performed to grind the roughly milled and cast or forged rotors by performing a first, rough profile grinding operation and then a fine profile grinding operation, for example by using, for example, profile grinding discs with corundum or CBN.
    Such known methods exhibit a number of disadvantages.
    First of all, two or three different machine tools are needed, which use a different technology and each have their own programming and tools.
    This has the disadvantage that this entails additional costs, both in the purchase and in the maintenance of such machines.
    Providing your own tools and restraining means for both the tools and the workpieces also entails extra costs.
    For the people who have to operate the machine tools, working with two types of machine tools also requires a thorough form of organization.
    The preparation and adaptation of the different types of machine tools for the manufacture of a specific rotor also requires a lot of work and time since they each have their own set-up.
    An additional disadvantage is that with the traditional method the rotor must be clamped three times and then relaxed in a machine tool, which of course takes extra time.
    Moreover, the time that a workpiece spends in a machine tool is not the same for every machine. This has the disadvantage that there is a need for accurate planning and that the capacity of the machine tools is not used to the maximum, which also entails an economic loss.
    Another important disadvantage is the fact that the rotor has to be clamped several times in the different machine tools, which is often not automated but by hand, which means that all kinds of errors can occur.
    For the rotor to be produced to function properly, it is of great importance that the rotor profile is manufactured with a very high accuracy. In particular, the whole should be very well aligned with respect to the rotor shaft of the rotor.
    However, by repeatedly clamping and relaxing in the different machine tools, the rotor runs the risk of being damaged during these manipulations, whereby not only the functional parts can be damaged, but also the center holes used in a subsequent machine tool for reference for clamping.
    Not only damage to the center holes, but also the clamping errors that inevitably occur during multiple manual clamping, can have an adverse effect on the accuracy of the rotor body alignment in the machine tool and consequently on the quality of the finish.
    Indeed, every machine tool has different clamping means and a different set-up, making clamping errors almost inevitable.
    During the rough profile grinding, a large part of the grinding capacity is converted into heat that accumulates in the rotor.
    This has a negative influence on the quality of the end faces of the rotor body and on the diameter of the outer cylinder shell of the rotor body that has already been rotated and finished.
    Moreover, after the rough profile grinding, a fine profile grinding operation is immediately carried out, wherein the aforementioned heat that has accumulated in the workpiece is only gradually removed during this fine grinding operation.
    A consequence of this is that due to the change in temperature the dimensions of the workpiece change during the fine grinding and thus the profile of the rotor body is not uniform.
    This can ultimately lead to leaks between two co-operating rotors when they are used in, for example, a compressor or between the rotors and the housing. This of course has a negative influence on the performance of the compressor that uses such rotors.
    Also, during the rough grinding operations, large burrs are formed on the already finished end faces of the rotor body and / or on the external cylinder shell of the rotor body. These burrs cannot be removed during the fine grinding operations of the rotor body and are subsequently removed by hand.
    This additional processing step not only takes time, there is also the disadvantage that damage to the already finished parts of the rotor is removed during the removal of these large burrs. Consequently, removal must be done with great caution.
    The present invention has for its object to provide a solution to at least one of the aforementioned and other disadvantages.
    To this end the invention relates to a method for manufacturing a screw rotor for a compressor, an expander or the like, the method comprising at least the following steps: - providing a cast or forged workpiece with a rough shape of the screw rotor to be produced with a helical rotor body and a rotor shaft with two journals projecting radially with respect to the end faces of the rotor body; clamping in a machine tool the workpiece at the outer diameter of the rotor body; - drilling center holes and possibly other holes or cavities in the end faces at the ends of the journals; optionally further finishing of the end faces at the ends of the journals by milling into the desired shape and cutting a thread if necessary; - clamping the workpiece (14) using the center holes (13) and releasing the workpiece (14) at the location of the outer diameter of the rotor body (2); roughly rotating a clamping surface on a journal; - clamping the workpiece with the aid of a chuck at the location of the aforementioned clamping surface of the spindle; roughly rotating the rotor body and the end faces of the rotor body for removing the casting crust or forging skin; rough profile milling of the rotor body with the aid of a form mill so that a workpiece is obtained with a rough milled rotor body; - roughly rotating the spindles and end faces of the rotor body; fine profile milling or grinding of the rotor body; - fine rotation of the spindles, end faces of the rotor body and along the outer diameter of the rotor body; wherein all steps are performed with the same machine tool.
    All processing steps of a method according to the invention take place on the same machine tool, which offers many advantages.
    First of all, only one machine tool must be purchased and the people involved in the production process of a screw rotor must only learn to work with one machine.
    Moreover, the capacity of the machine tool is fully utilized and a step-by-step capacity expansion is possible.
    In addition, only one machine must be set and adjusted depending on the type of screw rotor that must be manufactured.
    Moreover, there is no loss of time when exchanging workpieces between different machines, so that the degree of utilization of a machine tool in a method according to the invention is therefore greater than in the known methods and whereby the time required to manufacture a screw rotor is considerably shortened.
    Since the workpieces no longer have to be exchanged between different types of machine tools, it is possible that one person operates different machine tools.
    Because the workpiece must be clamped in only one machine tool, clamping errors can be reduced to a minimum or even avoided altogether.
    This will ensure that the quality of the finished screw rotor is higher.
    In addition, the chance of damage that can occur with frequent manipulation of a workpiece to, for example, exchange it between different machine tools, will be drastically reduced or even avoided.
    Another advantage is that the rough profile operations are not immediately followed by fine finishing operations whereby the heat accumulation that occurs during the rough profile milling can be discharged during the next step, namely the rough rotation of the journals, so that no temperature changes can occur in the processing step of the fine finishing operations that could adversely affect quality.
    Moreover, less heat will be generated during fine profile milling or grinding when the rotor body is roughly profiled, since material is milled away during this step, so that only a limited layer of material must be removed during the fine machining step.
    In addition, the fine turning of the journals, end faces of the rotor body and along the outer diameter of the rotor body will take place as the final step. This has the advantage that the large burrs that arise during the rough machining steps, such as, for example, the rough profile milling, can be removed before the aforementioned finishing operations are started, for example during the rough rotation of the journal steps and end faces of the rotor body.
    As a consequence, the removal of the burrs will not only not have to be done manually, but also the mechanical removal will not be able to damage the finished parts of the workpiece, since the workpiece is not finished until the final processing step.
    Small remaining burrs can possibly be removed on the machine with a specially designed deburring brush.
    The invention also relates to a machine tool for manufacturing a screw rotor according to a method according to any one of the preceding claims, starting from a cast or forged workpiece with a rough shape of the screw rotor to be manufactured with a helical rotor body and a rotor shaft with two radially projecting journals, wherein the machine tool is at least provided with: clamping means for clamping the rotor body of the workpiece; - center points for clamping a workpiece through center holes in the journals; - a claw plate; - one or more cutting tools, chisels, knives or the like; - one or more form milling cutters with flushing nozzles; and wherein the machine tool is further provided with: - either one or more mills with one to a maximum of three hard metal inserts that repeatedly return to the mill; or one or more workpiece spindle for profile milling that is or will be provided with a profile grinding wheel and with means to increase the speed of the profile grinding wheel.
    With the insight to better demonstrate the characteristics of the invention, a few preferred variants of a method according to the invention and a machine tool have been used herewith as an example without any limiting character, with reference to the accompanying drawings, in which: figure 1 schematically and in side view a screw rotor of a screw compressor; figures 2 to 8 schematically represent the successive steps of a method according to the invention; Figure 9 schematically represents a machine tool according to the invention.
    The rotor 1 shown in Figure 1 is a screw rotor 1 of a screw compressor, which consists of a helical rotor body 2 and a rotor shaft AA 'with two radially projecting journals 3a, 3b.
    The rotor body 2 can be enclosed in a cylindrical body between two end faces 4a, 4b.
    The cylindrical body has an outer diameter D.
    The rotor body 2 is provided with a helical toothing 5, the helical teeth 6 being separated from each other by helical grooves 7.
    The journals 3a, 3b consist of different sections with varying diameters. In the example of Fig. 1, a modified portion 8 is provided at one end of a spindle 3b for driving the rotor 1. Furthermore, each spindle 3a, 3b is provided with a portion 9a, 9b which serves as a bearing seat.
    Adjacent the bearing seat 9a, the journal 3a shows a certain offset to form an axial stop surface 10 which is perpendicular to the axis line AA 'of the rotor 1 and which can be used as a stop surface 10 for the bearing to be provided.
    Furthermore, on the spindles 3a, 3b, against the rotor body 2, portions 11a, 11b are provided for sealing the screw rotor 1 in the housing of the screw compressor.
    Finally, a center hole 13 is provided in each end face 12a, 12b of the journals 3a and 3b, respectively. This center hole 13 is used for clamping and centering the journals 3a, 3b in a machine tool.
    In addition to the center holes 13, the end faces 12a, 12b can also contain bores and threaded bores.
    It is clear that this complex form requires a multitude of different operations.
    The method according to the invention makes it possible to perform these different operations on one machine tool and is illustrated with reference to Figures 2 to 8.
    A method according to the invention is based on a workpiece 14, for example a cast workpiece 14 or a forging with a rough shape of the screw rotor 1 to be manufactured, in other words a workpiece which is already more or less in the form of a rotor 1 such as shown in Figure 1.
    In the first step, this workpiece 14 is clamped in a machine tool at the outer diameter of the rotor body 2. This is shown schematically in Figures 2 and 3. This can be done with the aid of suitable clamping tools 15 such as clamps or the like.
    By clamping in the rotor body 2, the end faces 12a, 12b of the journals 3a, 3b remain free, so that the second step can be carried out.
    This second step comprises the machining and finishing of the end faces 12a, 12b of the journals 3a, 3b by: optionally milling the end faces 12a, 12b into the desired shape; - drilling center holes 13 and possibly other holes and cavities in the end faces 12a, 12b at the ends of the journals 3a, 3b.
    Optionally, this step also comprises the following step for finishing the end faces 12a, 12b: - cutting out a screw thread if necessary.
    The center holes 13 can be used in a later step for clamping the workpiece 14.
    Preferably, the workpiece 14 is then centered by clamping the workpiece with the center holes 13 of the journals 3a, 3b between center points 18 provided for this purpose on the machine tool.
    The clamping tool 15 which engages the outer diameter of the rotor body is also preferably removed automatically, so that the rotor body is free.
    It is important to note that the workpiece 14 is clamped in the same machine tool and that during all subsequent steps of a method according to the invention the workpiece 14 is no longer relaxed, in other words the workpiece 14 is clamped in the same machine machine during the entire process remains without the intervention of a machine operator.
    A clamping surface 16 is then roughly turned on a journal 3a. This clamping surface 16 coincides in this case with a part of the bearing seat 9a.
    As shown in Figure 2, this rough turning in this example takes place in the known manner by means of longitudinal turning with the aid of a suitable bit 17 or the like.
    Preferably, for roughly rotating the clamping surface 16, use is made of a so-called star drive 19a mounted on a jaw plate 19 to drive the workpiece.
    In the next step, the workpiece 14 is clamped in the machine tool with the aid of the chuck plate 19 provided for this purpose at the location of the aforementioned clamping surface 16 which was prepared during the previous processing step.
    Figure 4 shows the clamping of the workpiece 14 with the aid of the center points 18 and the claw plate 19.
    Such clamping of the workpiece 14 will ensure that the workpiece 14 is sufficiently supported to be able to absorb the large forces that occur during the following processing steps.
    In a next step, the rotor body 2 and the end faces 4a, 4b of the rotor body 2 are roughly turned to remove the casting crust, for example with a suitable bit 17.
    Subsequently, the rotor body 2 undergoes a rough profile milling operation with a form mill 20, as shown in Figure 5, wherein the rotor body 2 of the workpiece 14 is shown in simplified form for the sake of clarity.
    Due to this rough profile milling operation, material will be removed from the rotor body 2 and a workpiece 14 will be obtained with a rough milled rotor body 2.
    During this step, material is removed from the workpiece 14 such that only a limited layer of material has to be removed during the following operations of the rotor body 2.
    The profile milling requires a complex combined movement of the workpiece 14 and the form mill 20, the form mill 20 having a profile corresponding to the profile of the helical grooves 7 of the rotor body 2.
    Hereby it is important to note that by changing the form cutter 20, both male and female rotors 1 can be manufactured.
    The spindles 3a, 3b and the end faces 4a, 4b of the rotor body are then roughly turned. This can be done with the aid of a standard bit 17 or the like in the known manner.
    This step preferably comprises the following operations: - turning the journals 3a, 3b into a suitable diameter; - turning the bearing seats 9a, 9b; - rotating the end faces 4a, 4b of the rotor body.
    During this step, it is also possible to remove the large burrs that have formed during the rough profile milling of the rotor body 2.
    Also, sufficient cooling is preferably carried out during this step to be able to dissipate the heat created during the profile milling.
    This can be done, for example, by directing a flushing nozzle 21 to the contact between the bit 17 and the workpiece 14 as shown in Figure 6.
    After these first rough machining steps, the workpiece 14 is finished with a number of fine milling and turning operations to finish the rotor 1.
    A first fine processing step comprises fine profile milling or grinding of the rotor body 2.
    When the fine profile milling is chosen, use is preferably made of at least one milling cutter with one to a maximum of three hard metal inserts that repeatedly return to the milling cutter, as it were around the circumference of the milling cutter. These inserts have the exact shape of the profile.
    When the fine profile milling is chosen, use is preferably made of a workpiece spindle 22 for profile milling, that is to say that such workpiece spindle 22 rotates at a relatively low speed and exerts a large torque.
    If, on the other hand, the fine profile grinding is chosen, the workpiece spindle 22 is or is preferably provided with a profile grinding wheel 23 and with means 24 for increasing the speed of the profile grinding wheel 23. This is shown in Figure 7 where, analogously to Figure 5, the rotor body 2 of the workpiece 14 is shown in simplified form.
    The profile grinding wheel 23 has a shape corresponding to the profile of the helical grooves 7 of the rotor body 2.
    In order to make the profile mill workpiece spindle 22 suitable for fine profile grinding operations with the profile grinding wheel 23, the means 24 for increasing the speed of the profile grinding wheel 23 are provided. These means can be formed by a gear transmission which transfers the rotation of the workpiece spindle 22 to a profile grinding wheel 23 with a ratio of, for example, 1: 2 or 1: 3.
    Furthermore, these means 24 can also be provided with bearings which have the advantage that they can handle these high speeds and have virtually no play.
    It is important that these means 24 are sufficiently sturdy and stable to ensure that the profile grinding wheel 23 is held in place so that a high accuracy can be obtained.
    It is also important that during the fine profile grinding operations a cooling is provided, which can take the form of a rinsing mouth 21 as in the example of Figure 7, in order to be able to dissipate the heat that arises during the fine profile grinding operations.
    It is not excluded that means are provided that allow a tool such as a profile grinding wheel 23 on the workpiece spindle 22 to be changed automatically. This will ensure that no time loss will occur during the process.
    After the fine machining of the rotor body 2, the step of fine turning of the journals 3a, 3b, end faces 4a, 4b of the rotor body 2 and along the outer diameter of the rotor body 2 follows.
    By carrying out this finishing step after the fine profile milling or grinding of the rotor body 2, the fine burrs formed during the fine profile milling or grinding can be removed before proceeding to finishing the other parts of the workpiece 14.
    For this step, the claws are released from the jaw plate 19 so that the workpiece 14 is only clamped by means of the center points 18 and possibly a so-called star carrier.
    The pivot pins 3a, 3b, the end faces 4a, 4b of the rotor body 2 and the outer diameter of the rotor body 2 can be turned finely with the aid of standard tools, such as knives, chisels 17 and the like.
    According to a preferred characteristic, this fine turning takes place with the aid of a plurality of tools 25 which are provided in an exchange system 26 of the so-called turret head type as shown in figure 8.
    The advantage of such a turret head 26 is that the tool 25 can be changed quickly by rotating the turret head 26 until the appropriate tool 25 is rotated towards the workpiece 14, so that the time required for fine turning is shorter.
    Moreover, a turret head 26 will increase the accuracy, since no standard tool change must be performed, but only a rotation of the turret head 26.
    The fine turning of the journals 3a, 3b includes fine turning of the rotor shaft diameters and of the bearing seats 9a, 9b and optionally other parts 8, 10, 11a, 11b of the journals 3a, 3b.
    Small remaining burrs can possibly be removed with a deburring brush provided for this purpose.
    Subsequently, the finished workpiece 14, which is now in the form of a finished screw rotor 1 as shown in Figure 1, can be released from the machine tool and a subsequent cast or forged workpiece 14 can be clamped in the machine tool.
    As already mentioned, in a method according to the invention, all steps are performed by the same machine tool.
    A possible embodiment of a machine tool 27 according to the invention is shown in Figure 9.
    The machine tool 27 according to the invention firstly comprises the following clamping means: - clamping means 15, such as clamps or the like, which allow to clamp a workpiece 14 at the location of the outer diameter of the rotor body 2; center points 18 for clamping a workpiece 14 by means of center holes 13 in the journals 3a, 3b; - a chuck 19.
    The clamping means 15, 18, 19 are arranged on the machine tool 27 and displaceable via an NC axis of the machine machine 27 so that they do not interfere with the machining steps or so that they are movable when they are not being used.
    The machine tool 27 further comprises a number of tools or tools which in this case are provided in a magazine 28 with an automated changer 29 of the machine machine 27.
    The automated changer 29 will be able to place a tool from the magazine 28 into the machine tool 27 and to place a tool back into the magazine 28.
    These tools comprise first of all a number of cutting tools, chisels 17, knives or the like which are schematically represented in Figure 9 by means of the chisel 17. A suitable tool holder 30 is optionally also provided here, which is suitable for mounting in and driven by the processing machine 27 and which is suitable for mounting one of the aforementioned tools 17.
    This tool holder 30 and possibly other tool holders can also be fitted by the exchanger 29 and removed from the machine tool 27.
    The aforementioned tools 17 can be used for the step of roughly turning the different parts 8, 9a, 9b, 10, 11a, 11b of the journal journals 3a, 3b and the rotor body 2 and during the optional finishing of the end faces 12a, 12b of the axle journals 3a, 3b.
    The magazine 28 also contains one or more form milling cutters 31 with flushing nozzles 21 which are used during the rough profile milling of the rotor body 2.
    Furthermore, the magazine also comprises a number of profile grinding discs 23 for fine profile grinding of the rotor body 2.
    These profile grinding discs 23 can be mounted on a tool spindle 22 for profile milling, which is also provided.
    To this end, this tool spindle 22 is provided with means 24 for increasing the speed of the profile grinding wheel 23 on the tool spindle 22.
    These means 24 are shown schematically in Figure 9, but may, for example, comprise a gear transmission, as already mentioned above.
    It is possible that instead of a workpiece spindle 22 with profile grinding discs 23, one or more cutters are provided with one to a maximum of three hard metal inserts that repeatedly return to the profile cutter that can be used for fine profile milling of the rotor body.
    In this case, the machine tool 27 is also provided with an exchange system 26 of the so-called turret head type, which is provided with a number of tools 25 for finishing the journals 3a, 3b.
    It is also possible that the machine tool is equipped with one or more deburring brushes.
    It is also possible to provide one or more drill heads and one or more cutters in the magazine 28.
    In this case, the machine tool 27 is provided with means 32 for automatically changing a tool 23 on the aforementioned workpiece spindle 22.
    These means 32 may for example be the automatic changer 29, in other words the automatic changer 29 will not only be able to take tools 17, 20, 21, 23, 31 from the magazine 28, but also the appropriate tool 17, 20, 21, 23 , 31 on the appropriate tool holder 22, 30 places.
    This automatic changer 29 can be controlled, for example, on the basis of a CNC control 33 or a computer-controlled control.
    With the aid of this CNC control 33, the turret head 26 can also be controlled and can also control the machine tool 27 for carrying out the various machining steps and driving tools 17, 20, 21, 23, 31 in the appropriate manner.
    It is clear that such CNC control 33 can be used to control the machine tool 27, the automatic changer 29 and the turret head 26 such that a rotor 1 can be manufactured with the machine machine 27 according to a method according to the invention, and this by ensuring ensuring that the appropriate tools 17, 20, 21, 23, 31 and tool holders 22, 30 are fitted in and driven by the machine tool 27 at the appropriate moments and that the machine machine 27 performs the appropriate machining steps.
    The present invention is by no means limited to the embodiments described as examples and shown in the figures, but such a method and processing machine can be realized according to different variants without departing from the scope of the invention.
    权利要求:
    Claims (19)
    [1]
    Conclusions.
    Method for manufacturing a screw rotor (1) for a compressor, an expander or the like, characterized in that the method comprises at least the following steps: - providing a cast or forged workpiece (14) with a rough shape of the screw rotor (1) to be manufactured with a screw-shaped rotor body (2) and a rotor shaft (AA ') with two journals (3a, 3b) projecting radially with respect to the end faces (4a, 4b) of the rotor body (2); - clamping in a machine tool (27) the workpiece (14) at the location of the outer diameter of the rotor body (2); - drilling center holes (13) and optionally other holes or cavities in the end faces (12a, 12b) at the ends of the journals (3a, 3b); - optionally further finishing the end faces (12a, 12b) at the ends of the journals (3a, 3b) by milling in the desired shape and cutting a thread if necessary; - clamping the workpiece (14) using the center holes (13) and releasing the workpiece (14) at the location of the outer diameter of the rotor body (2); - roughly rotating a clamping surface (16) on a spindle (3a); - clamping the workpiece (14) with the aid of a claw plate (19) at the location of the aforementioned clamping surface (16) of the journal (3a); - roughly rotating the rotor body (2) and the end faces (4a, 4b) of the rotor body (2) for removing the casting crust; - rough profile milling of the rotor body (2) with the aid of a form mill (20) so that a workpiece (14) is obtained with a rough milled rotor body (2); roughly rotating the spindles (3a, 3b) and end faces (4a, 4b) of the rotor body (2); fine profile milling or grinding of the rotor body (2); finely rotating the journals (3a, 3b), end faces (4a, 4b) of the rotor body (2) and along the outer diameter of the rotor body (2); wherein all steps are performed with the same machine tool (27).
    [2]
    Method according to claim 1, characterized in that for clamping the workpiece (14) with the jaw plate (19), the workpiece (14) is centered by the workpiece (14) with the center holes (13) of the journals (13) 3a, 3b) to be clamped between center points (18) provided for this purpose on the machine tool (27), after which the rotor body (2) is relaxed.
    [3]
    Method according to claim 1 or 2, characterized in that for roughly rotating the clamping surface (16) use is made of a star drive (19a) mounted on the jaw plate (19) to mount the workpiece (14) float.
    [4]
    Method according to one of the preceding claims, characterized in that during the aforementioned step of roughly rotating the spindles (3a, 3b) and end faces (4a, 4b) of the rotor body (2) at least one of the following operations are carried out: - turning spindles (3a, 3b) to an appropriate diameter; - turning the bearing seats (9a, 9b).
    [5]
    Method according to one of the preceding claims, characterized in that cooling takes place during the aforementioned step of rough rotation of the spindles (3a, 3b) and end faces (4a, 4b) of the rotor body (2).
    [6]
    Method according to one of the preceding claims, characterized in that for the aforementioned step of fine profile milling or grinding of the rotor body (2) use is made of at least one cutter with one to a maximum of three hard metal inserts that repeatedly return to the cutter and which have the exact shape of the profile.
    [7]
    Method according to one of the preceding claims, characterized in that for the aforementioned step the fine profile milling or grinding of the rotor body (2) is made use of a workpiece spindle (22) for profile milling.
    [8]
    The method according to claim 7, characterized in that for the aforementioned fine profile step, the workpiece spindle (22) is or will be provided with a profile grinding wheel (23) and with means (24) around the speed of the profile grinding wheel (23) ) increase.
    [9]
    Method according to claim 8, characterized in that the aforementioned means (24) for increasing the speed of rotation are formed by a gear transmission.
    [10]
    Method according to claim 8 or 9, characterized in that the above-mentioned means (24) for increasing the speed of rotation are provided with bearings with a small play.
    [11]
    Method according to one of the preceding claims 8 to 10, characterized in that the means (24) for increasing the speed of rotation are provided with a cooling.
    [12]
    Method according to one of the preceding claims 7 to 11, characterized in that the workpiece spindle (22) is provided with means (32) that allow a tool to be changed automatically on the workpiece spindle (22).
    [13]
    Method according to one of the preceding claims, characterized in that, for the aforementioned step of fine turning the journals (3a, 3b), the end faces (4a, 4b) of the rotor body (2) and the diameter of the rotor body ( 2), the claw plate (19) is released.
    [14]
    Method according to claim 13, characterized in that use is made of standard tools.
    [15]
    Method according to claim 13, characterized in that use is made of a plurality of tools (25) which are provided with an exchange system (26) of the so-called turret head type.
    [16]
    Machine tool for manufacturing a screw rotor (1) according to a method according to one of the preceding claims, starting from a cast or forged workpiece (14) with a rough shape of the screw rotor (1) to be produced with a screw-shaped rotor body (2) ) and a rotor shaft (AA ') with two radially projecting journals (3a, 3b), characterized in that the machine tool (27) is provided with at least: clamping means (15) for clamping the rotor body (2) of the workpiece (14) ); center points (18) for clamping a workpiece (14) by means of center holes (13) in the journals (3a, 3b); - a claw plate (19); - one or more cutting tools, chisels (17), knives or the like; - one or more form mills (20) with flushing nozzles (21); - one or more suitable tool holders (22, 30) for mounting a tool in the machine tool (27); and wherein the machine tool (27) further comprises: one or more mills with one to a maximum of three carbide inserts that repeatedly return to the mill; and / or - one or more workpiece spindles (22) for profile milling that is or will be provided with a profile grinding wheel (23) and with means (24) to increase the speed of the profile grinding wheel (23).
    [17]
    Machine tool according to claim 16, characterized in that the jaw plate (19) is provided with retractable jaws and a star drive (19a).
    [18]
    Machine tool according to claim 16 or 17, characterized in that the machine machine (27) is further optionally provided with: - one or more drill heads; - one or more milling; - one or more circular grinding wheels (31); - one or more deburring brushes; - means (32) for automatically changing a tool on the workpiece spindle (22); - one or more interchangeable systems (26) of the so-called turret head type provided with a plurality of tools (25).
    [19]
    Machine tool according to one of the preceding claims 16 to 18, characterized in that the machine machine (27) is provided with an automated changer (29) for changing workpieces in the machine machine (27) and with a computer-controlled control (33) for appropriate control of the machine tool (27), the automated changer (29), optionally the turret head (26) and optionally the means (32) for automatically changing a tool (23) on the workpiece spindle (22).
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5052089A|1988-05-25|1991-10-01|Somab, S.A.|Multi-function machine tool which permits complex machining of long pieces|
    EP1402982A1|2002-09-26|2004-03-31|Mori Seiki Hitech Co., Ltd.|Multi-function machine tool and machining method in multi-function machine tool|
    US20090217528A1|2008-02-29|2009-09-03|Mitsubishi Electric Corporation|Method and apparatus for working a screw rotor, end mill for working , and method of manufacturing a screw compressor|
    EP2450134A1|2009-06-30|2012-05-09|Yamazaki Mazak Corporation|Composite working lathe|
    WO2012100307A1|2011-01-24|2012-08-02|Atlas Copco Airpower, Naamloze Vennootschap|Method and grinding machine for the manufacturing of a rotor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US201461847165P| true| 2014-06-06|2014-06-06|
    US61/847165|2014-06-06|PCT/BE2014/000028| WO2015021515A2|2013-07-17|2014-06-13|Method and machine tool for manufacturing a screw rotor of a compressor, an expander of the like|
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