• 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:
    A method for reducing the eccentricity of the inner to outer surface (7, 9) of a hollow workpiece (1), in particular a hollow shaft, rotatably clamped in a machine tool (2) is shown, in which one of a plurality of contours of the inner surface (7) of the hollow workpiece (1) dependent measurement data, in particular by means of ultrasound, using the recorded measurement data calculated a target surface (13) for at least a portion of the outer surface (9) with a reduced eccentricity to the inner surface (7) and in a further step, the rotating workpiece (1) on its outer surface (9) corresponding to the desired surface (13) is at least partially machined. In order to create special process conditions, it is proposed that at least one partial surface (14, 15) corresponding to the calculated nominal surface (13) be machined on the outer surface (9) of the workpiece (1) and the workpiece (1) using at least the generated partial surface (14, 15) via clamping means (3, 4), in particular chuck (3 ') and / or bezel (17), is newly clamped, after which in this new clamping at least the remaining outer surface (9) of the rotating workpiece ( 1) is at least partially machined so as to reduce the eccentricity of the inner to the outer surface (7, 9).
    公开号:AT511195A4
    申请号:T121/2011
    申请日:2011-01-28
    公开日:2012-10-15
    发明作者:Reinhard Koll
    申请人:Wfl Millturn Tech Gmbh & Co Kg；
    IPC主号:
    专利说明:

    -1 - 2_ (00 032PAT) each!
    The invention relates to a method for reducing the eccentricity of the inner to the outer surface of a hollow workpiece rotatably mounted in a machine tool, in particular a hollow shaft, in which a plurality of measured data dependent on the contour of the inner surface of the hollow workpiece, in particular with the aid of ultrasound, are recorded, using the recorded measurement data calculated a target area for at least part of the outer surface with a reduced eccentricity to the inner surface and in a further step, the rotating workpiece is machined on its outer surface corresponding to the target surface at least partially.
    In order to reduce the imbalance in hollow workpieces, methods are known from the prior art, in which the degree of concentricity between the inner and outer surface can be increased. It is also known (DE19958373A1) rotatably clamp a hollow workpiece and record in this clamping a plurality of the course or from the contour of the inner surface of the hollow workpiece dependent measurement data. On the basis of these coordinates of measuring points obtained by means of an ultrasound measurement, a desired course of the outer surface or a desired outer surface is calculated, corresponding to which, in the same clamping as in the measurement, the outer surface of the workpiece is turned by cutting. Thus, the course of the outer surface can be formed parallel to the inner surface or thus the eccentricity of the inner to the outer surface can be improved. A disadvantage of this method is the comparatively high measurement, calculation and control effort. Thus, first of all, a considerable number of measurement data has to be recorded, which must then also be processed in order to be able to mathematically map a precise target outer surface of the hollow workpiece. The processing of the high
    In the next step, the workpiece also requires a comparatively high control wall because the entire hollow workpiece is turned off in a controlled manner. Such methods are therefore not only expensive, but also slow, which in turn precludes a precise machining, in particular with optimal cutting data with respect to the tool used. For example, such slow processes can not guarantee a comparatively high surface quality. However, a reduction in the number of recorded measurement data for process acceleration can disadvantageously lead to a significant loss of accuracy in the machining of the workpiece, so that no improvements to the process are possible. In addition, operator errors in the selection of the number of measuring points can have a considerable influence on the quality of the method result. Such methods can therefore not handle high quality workpieces satisfactorily, such methods being prone to error, slow and unfriendly to use.
    The invention is therefore based on the object to improve a method of the type described in such a way that not only a comparatively high degree of concentricity of inner and outer surfaces can be achieved, but that at the same time also a precise machining of the outer surface of the workpiece becomes possible. In addition, the process should be fast and easy to use.
    The invention achieves this object by producing at least one partial surface corresponding to the calculated nominal surface in a machining operation on the outer surface of the workpiece and re-clamping the workpiece by using at least the produced surface via clamping means, in particular chuck and / or steady rest, after which in this new clamping at least the remaining outer surface of the rotating workpiece is at least partially machined to thereby at least partially reduce the eccentricity of the inner to the outer surface.
    POSSIBLE ....... ·· ·· • · · * · · ·· * · * ........ ·; ; »* · 99 99 ·· · · 3
    If at least one partial surface corresponding to the calculated nominal surface is machined on the outer surface of the workpiece and the workpiece re-clamped using at least the generated partial surface, then the workpiece can be prepared for precise further processing with comparatively simple and rapid method steps. This relative to the entire outer surface comparatively small partial area can namely be adapted comparatively quickly in the concentricity to the inner surface of the cavity of the workpiece, so that without special measures on the workpiece, a surface can be made, which can be suitable for a new and precise clamping. Advantageously, the extension of the partial surface must be provided according to the requirements of the clamping means on the workpiece. In the new clamping can then be provided with simple handling steps these clamping means to align the axis of symmetry of the inner surface particularly accurate to the axis of rotation of the machine tool or bring these two axes in exact agreement. Thus, in this new setup also a very accurate rotation guide of the workpiece can be made possible, which can be an excellent starting point for reducing the eccentricity of the inner to the outer surface by means of a machining. For this purpose, at least the remaining outer surface of the rotating workpiece must now at least partially be machined in this new setting. Such a clamping can be created for example by means of a chuck or a supporting and / or clamping bezel. Since no correction controls on the guide of the tool with respect to a reduction of the eccentricity of the inner to the outer surface must be made during the new setup, the inventive method is also particularly fast. In contrast to the prior art, therefore, no negative impact on the quality of the machining of the outer surface, for example in the feed and / or in the cutting speed, must be taken into account, which can always ensure a precise machining, even if at the same time a the eccentricity of the inner to the outer surface is reduced. This is mainly because the tool can also be used with optimal cutting data
    POSSIBLE - 4 - 2- and unaffected by well-known and ever-changing guide parameters for the tool against the unbalanced workpiece. For example, it can be used to meet the highest requirements in terms of surface quality. Furthermore, by simple handling steps in the preparation of the new clamping an easy to use method can be created.
    The degree of concentricity of inner and outer surfaces can be significantly improved if the part surface is milled. In fact, because of the rotary milling, a cutting tool can be guided in a compensating manner, particularly precisely in relation to the eccentricity of the outer surface, in order to provide a surface for a precise re-clamping. In addition to improved process results due to a reduced eccentricity of the inner surface to the outer surface, the method step for applying the partial surface can also be significantly accelerated with the aid of rotary milling. The process can not only be more accurate but also run faster. Axis-parallel turning milling has been particularly excellent for creating the partial surface.
    The unbalance of the hollow workpiece can be further reduced if the outer surface is at least partially machined by turning round in the new setup. In particular, a longitudinal rotation can prove to be advantageous.
    If the workpiece is re-clamped over the inner surface and over the generated partial surface for the new clamping, then the method can be further simplified by using an already existing surface, namely the inner surface, for the new clamping. In addition, there is the fact that the clamping on the inner surface, which indeed represents a reference surface for shaping the outer surface, so can be used for the new setup, without having to accept a loss of accuracy in purchasing. It can therefore be created simultaneously with a reduction in the operating effort and an increase in the accuracy of the method.
    FOLLOWED · * · «* * ►» »· · · · · ♦ * * · · * * φ t · *» φ · · · # · «· ♦ · 5
    With regard to a further reduction of the operating effort as well as a further increase in accuracy, it may further prove to be advantageous if the inner surface is tensioned in in particular via a clamping mandrel and is supported on its generated partial surface via a steady rest.
    If a first Teitfläche the chuck and a second part of the opposite end of the workpiece, which is supported in this particular area of a bezel, attached to the workpiece, then long hollow workpieces can be precisely reduced in the unbalance. Because of their comparatively close clamping means, the two partial surfaces can be manufactured with the highest accuracy, so that a particularly high degree of concentricity of partial surface and inner surface can be made possible. By means of these special partial surfaces, the entire eccentricity of the inner to the entire outer surface can then also be markedly improved if the hollow workpiece for the new clamping is clamped by one partial surface of the chuck and the other partial surface is supported by a steady rest and subsequently processed further.
    In the figures, for example, the inventive method is explained in more detail. Show it
    1 is a front view of a clamped in a machine tool hollow workpiece,
    2 is a processing view of the clamped according to FIG. 1 workpiece,
    3 is a front view of the workpiece according to FIG. 2 in a new clamping, FIG.
    4 shows a torn-off front view of the workpiece clamped according to FIG. 3 during machining with regard to the reduction of the eccentricity of the inner surface to the outer surface, FIG.
    5 is a sectional view of an alternative clamping of FIG .. 3
    According to the figures 1 to 4, for example, the inventive method is described in detail. 1 is a hollow workpiece 1, in particular a
    POSSIBLE -6- 9 · ♦ · 2-6- 9 · ♦ · 2- # · ♦ · • ♦ • ♦
    Hollow shaft, shown cut, which workpiece 1 is clamped in a machine tool 2. For this purpose, engage on the workpiece 1, two clamping means 3 and 4, namely on the one hand, an external clamping chuck 3 'and on the other opposite side of a tailstock 4', which spans the end face of the workpiece 1 with centering. The chuck 3 'is connected to a spindle drive 6 in order to clamp the workpiece 1 rotatably. As can be seen in Fig. 1, there is an eccentricity between the inner surface 7 of the cavity 8 and the outer surface 9, as can be seen at the angular position of the axis of symmetry 10 of the inner surface 7 and the axis of rotation 11 of the machine tool 2. In order to determine the eccentricity of the inner to outer surface 7 or 9, the wall thickness of the workpiece 1 is measured by an ultrasonic measuring device 12, at different locations in the circumferential direction or preferably also in the longitudinal direction of the workpiece 1. In this setup, therefore, several recorded by the contour of the inner surface 7 of the hollow workpiece 1 dependent measurement data. Using the recorded measurement data, a desired surface 13 is calculated for at least part of the outer surface 9 with a reduced eccentricity to the inner surface 7. In order to enable a particularly fast and stable method, only two partial surface 14,15 corresponding to the calculated target surface 13 are produced in a machining on the outer surface 9 of the workpiece 1. For machining at least one tool 16 is used. In contrast to the prior art, therefore, the outer surface 9 is not machined completely corresponding to the target surface, but only partially. The generated partial surfaces 14,15 are used to re-tension the workpiece 1. As can be seen in FIG. 3, the workpiece 1 is clamped with its first partial surface 14 into the chuck 3 'and supported on its second partial surface 15 by a steady rest 17 as further clamping means 4. Needless to say, other surfaces can be used for the new setup. In this new clamping, the symmetry axis 10 of the inner surface 7 and the axis of rotation 11 of the machine tool 2 can now be brought into the same position. Without special further measures, the remaining outer surface 9 of the rotating workpiece can now be machined, as can be seen in FIG. 4. The outer surface 9 can do so
    FOLLOWED according to the soil surface 13 are completed without the target surface 13 must be calculated for the entire outer surface 9. Therefore, it also does not require a lot of control effort for the tool 16, which simplifies the process. The eccentricity of the inner to the outer surface 7 to 9 can thus be reduced rapidly. In contrast to the prior art, the method allows a high processing speed, so that a comparatively high surface quality can be achieved.
    The partial surfaces 14 and 15 of FIG. 2 are rotationally milled with a tool 16 designed as a milling cutter 18, with preferably an axis-parallel rotary milling being carried out, which can produce particularly concentric partial surfaces 14 and 14 for the corresponding inner surface 7.
    According to FIG. 4, the outer surface 8 is machined by turning round with a turning tool 19 in the new clamping. In particular, longitudinal rounding is used for accurate process results.
    According to FIG. 5, it is shown that a surface other than the partial surfaces 14, 15 can also be used on the workpiece 1 for the new clamping. Namely, the inner surface 7 can be used for this purpose, with the help of the or the partial surfaces 14 and 15, the workpiece 1 precisely aufzuspannen new. This can be done for example via a mandrel not shown or on stepped jaws of the chuck 3. The second support or the second bearing can form a bezel, not shown in greater detail in FIG. 5, which acts on one of the finished partial surfaces 14 and 15.
    It need not be further mentioned that the faces 14, 15 are given for example. Depending on the needs of the workpiece 1, a partial surfaces or multiple partial surfaces can be provided on the workpiece, each position on the workpiece 1 is conceivable.
    SUBSEQUENT
    权利要求:
    Claims (6)
    [1]
    Patent Attorney Dipl.-Ing. Friedrich Jell Hittmairstraße 11, A-4020 Linz (00 032PAT) Claims 1. A method for reducing the eccentricity of the inner to the outer surface (7, 9) of a hollow workpiece (1) rotatably mounted in a machine tool (2), in particular one Hollow shaft, in which in a single clamping several of the contour of the inner surface (7) of the hollow workpiece (1) dependent measurement data, in particular by means of ultrasound, are recorded, using the recorded measurement data, a target surface (13) for at least part of the outer surface (9) calculated with a reduced eccentricity to the inner surface (7) and in a further step, the rotating workpiece (1) on its outer surface (9) corresponding to the target surface (13) is machined at least partially, characterized in that on the outer surface (9) of the workpiece (1) at least one partial surface (14, 15) corresponding to the calculated target surface (13) in a machined machining generated and the workpiece (1) using at least the part surface produced (14,15) via clamping means (3,4), in particular chuck (3 ') and / or bezel (17), re-tensioned, after which in this new setup at least the remaining outer surface (9) of the rotating workpiece (1) is at least partially machined so as to at least partially reduce the eccentricity of the inner to outer surface (7, 9).
    [2]
    2. The method according to claim 1, characterized in that the partial surface (14,15) is in particular axially parallel rotatably milled.
    [3]
    3. The method according to claim 1 or 2, characterized in that in the new clamping the outer surface (9) is machined at least partially by turning, in particular by longitudinal turning. AFTERWORK 11
    [4]
    4. The method of claim 1, 2 or 3, characterized in that for the new clamping the hollow workpiece (1) via its inner surface (7) and over the generated part surface (14 or 15) is newly clamped.
    [5]
    5. The method according to claim 4, characterized in that the inner surface (7) is biased in particular by a mandrel and a bezel (17) on its part surface generated (14 or 15) is supported.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that a first part surface (15) at the chuck of the clamping and a second part surface (14) at the opposite end of the workpiece, which is supported in this region of particular a bezel (17) on the workpiece (1), after which the hollow / f workpiece (1) is clamped by the chuck (3) at least with its second partial surface (14) and by a bezel (17) with its first partial surface (15). is supported. Linz, January 28, 2011 WFL Millturn Technologies GmbH & Co. KG by:

    SUBSEQUENT

    00032PAT • * · «« · · «« «« 9 W · · · · · «*« »» • t «* · · · · · · · · · · · · 9 9 9 9»

    <3π: | Submitted 2-00032PAT * 4 * *

    00032PAT «« · · · · · · ·

    oo CDEC FOLLOWED 2. 00032PAT u * * * * um um u ·· * · t »* ·« · · ·

    FIG.5

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    ATA121/2011A|AT511195B1|2011-01-28|2011-01-28|METHOD FOR REDUCING THE ECCENTRICITY OF THE INTERIOR TO EXTERNAL SURFACE|ATA121/2011A| AT511195B1|2011-01-28|2011-01-28|METHOD FOR REDUCING THE ECCENTRICITY OF THE INTERIOR TO EXTERNAL SURFACE|
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    RU2013139731/02A| RU2605042C2|2011-01-28|2012-01-27|Method for reducing eccentricity between inner and outer surfaces of hollow part clamped rotatably in machine|
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