• 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 treating a surface of a machine part, the method comprising the steps of: - applying a pattern to the surface of the machine part by means of a laser; - applying a coating to the patterned surface.
    公开号:BE1027351B1
    申请号:E20205454
    申请日:2020-06-22
    公开日:2021-10-14
    发明作者:Karel Vennens；Timmerman Chiara De
    申请人:Atlas Copco Airpower Nv；
    IPC主号:
    专利说明:

    Method for manufacturing machine parts such as, but not limited to compressors, expanders, or vacuum pump parts and machine parts made by the method The present invention relates to a method for manufacturing machine parts, such as, but not limited to compressors, expanders or vacuum pump parts.
    The surface of a machine part can be provided with a coating to influence the behavior of a machine part. For oil-free screw compressors, for example, a coating is applied to the surface of the rotor and housing to improve the operation of the oil-free screw compressor. The coating has several purposes. One goal is to reduce wear on the machine part. Another purpose is to improve the conduction of heat through the machine part. Another goal is to minimize the generation of heat during operation. Yet another object is to minimize leakage of air from the air chambers formed between the machine parts.
    When a machine part is coated, the aim is to obtain a good adhesion between the coating layer and the machine part. Particularly when the machine part ages, a sub-optimal adhesion of the coating layer can lead to delamination of the coating layer. This reduces the operational performance of the machine part and can potentially damage the machine. To obtain good adhesion, the surface of the machine part is pre-treated before applying the coating. This pre-treatment includes one or more cleaning steps, typically mechanical and/or chemical cleaning. During cleaning, dirt and grease are removed from the machine part. The pretreatment typically further includes a roughening operation to improve coating adhesion. A roughening operation can be carried out, for example, by means of sandblasting.
    A drawback of known techniques for treating a surface of a machine part is the significant impact on the environment. In particular, the pre-treatment steps such as cleaning and roughening generate harmful waste streams. Furthermore, at least some of these operations are complex to automate such that an operator performing the operations bears the risk of coming into physical contact with these harmful waste streams.
    It is an object of the present invention to improve the handling of machine parts. To this end, the invention provides a method for treating a surface of a machine part, the method comprises the steps of: - applying a pattern to the surface of the machine part by means of a laser;
    BE2020/5454 - application of a coating to the patterned surface.
    The invention is based on the insight that a laser can be used to clean a surface of a machine part and at the same time influence a roughness of the surface. By applying a pattern to the surface, the surface can be cleaned and a predetermined roughness can be obtained. Furthermore, the generation of harmful waste streams is greatly reduced using a laser, compared to traditional cleaning and roughening operations. In addition, the application of the pattern to the surface by means of a laser can be automated such that the load on and the risk to the operators is reduced.
    Preferably, the method further includes manufacturing the machine part. In the preferred embodiment, the machine part is a new machine part. Alternatively, the surface of an already used machine part can be treated. This is also called a refurbished machine part.
    Preferably, the machine part is selected from a group consisting of at least part of a screw rotor for an oil-free screw compressor, and at least part of a housing element for such an oil-free screw compressor. Particularly in the field of oil-free screw compressors, the surface treatment has been shown to be of great importance for the operation, efficiency and life of the compressor. For this reason, the proposed treatment is particularly advantageous for oil-free screw compressors.
    Preferably, the step of applying the pattern includes: - defining at least one path on the surface such that the at least one path extends over the surface; and - operating the laser in such a way that a laser is incident centrally on the surface on the at least one path.
    Preferably, the laser is directed toward the surface such that this beam is incident on the surface at an angle of approximately 90°. By impinging on the surface at an angle of approximately 90°, most of the laser beam's energy is transferred to the surface. Furthermore, reflection rays, which can have a harmful effect on the environment, are minimized.
    Preferably, operating the laser includes moving the laser relative to the surface such that a point where the laser impinges is said to follow at least one path at a predetermined speed. It should be noted that the displacement is defined in a relative manner, i.e. the laser relative to the surface. This means that the laser can move while the surface is fixed. Alternatively, the surface can move while the laser is fixed. Further alternatively and preferably, both the laser and the surface are moved to achieve a predetermined relative displacement of the laser with respect to the
    ; BE2020/5454 surface. By following at least one path at a predetermined speed, the laser impinges on the surface along the path. Because the path extends over the surface, the laser also impinges on the entire surface.
    Preferably, the laser is a pulsed laser and operating the laser includes delaying the laser beam at a predetermined operating frequency and at a predetermined operating intensity. Further preferably, the predetermined speed and the predetermined operating frequency are kept in a predetermined relationship to each other. Further preferably, this predetermined relationship is chosen such that successive laser beam pulses m fall at locations with a point-to-point distance from each other that is less than a diameter of the surface on which the laser is incident. The combination of these features allows it to fall into the surface along the path without interruption. In other words, at least the path is completely treated and no zones or surface parts can be found along the path that have not been processed by the laser beam. A laser beam spot is defined as an impact zone of a laser beam detectable on the surface.
    Preferably, the at least one path includes a plurality of path segments, adjacent path segments having a center to center distance that is preferably less than the diameter of the impact surface of the laser. The effect of the preferred embodiment is also that between adjacent path segments each portion of the surface is treated with the laser beam. In other words, no surface portion can be found between adjacent path segments, where the laser has not treated the surface.
    Preferably, the patterning is parameterized to obtain a surface roughness higher than 0.1 Ra, preferably higher than 1.3 Ra and optionally also a surface roughness higher than 10.0 Ry, at preferably higher than 15.0 Ry. Field tests and experiments have shown that the coating can be applied with a high degree of success when the surface roughness is higher than 1.0 Ra and optionally also higher than 10.0 Ry. The patterning parameters include laser beam intensity, travel speed, operating frequency, distance between adjacent path segments, which can be parameterized differently for different surfaces. In particular, the machine part material influences how these parameters should be selected to obtain the predetermined surface roughness.
    Preferably, the coating is applied in several layers. Further preferably, the method further comprises applying a first coating layer to the surface of the machine part before the patterning step, and wherein applying a coating involves applying a second coating layer to the patterned surface . This can be used when the quality of the first coating layer
    * BE2020/5454 is insufficient, and the surface needs a new coating. In this case, applying the laser pattern will remove the first coating layer and prepare the surface for good adhesion with the second coating layer. The quality of the first coating layer can be considered unsatisfactory after the machine part has been used. The quality of the first coating layer can also be considered unsatisfactory immediately after application of this layer, for example if something went wrong during manufacture.
    Preferably, the coating has a composition as described in European Patent Application No. 14155385.9, European Patent Application No. 17169341.9 and Chinese Patent Application No. CN 105132086.
    The invention further relates to an oil-free screw compressor comprising a rotor and a housing, at least one of which is at least partially treated according to the invention.
    The accompanying drawings are used only to illustrate preferred and non-limiting embodiments of devices according to the present invention. The above and other advantages of features and objects of the invention will become apparent, and the invention will be better understood from the following detailed description when read in conjunction with the accompanying drawings in which: Figure 1 illustrates some parameters of applying a pattern on a surface with a laser, Figure 2 shows a surface that has been treated with a laser; Figure 3 shows another surface treated with a laser; Figure 4 shows a system for carrying out the method according to the invention; Figure 5A-5D shows multiple patterns; and Figures 6A and 6B show a cross-section and a top view, respectively, of a further system for carrying out the method according to the invention.
    The method according to a preferred embodiment of the invention comprises the steps of: - manufacturing the machine part: - applying a pattern to the surface of the machine part by means of a laser; - applying a coating to the patterned surface. In an alternative embodiment, the method comprises the steps of: - renovating a machine part; - applying a pattern to the surface of a machine part by means of a laser; - applying a coating to the patterned surface.
    BE2020/5454 The method according to the invention is particularly useful for manufacturing coated machine parts, such as, for example, screw rotors or compressor housings for oil-free screw compressors, for scroll or tooth compressor manufacture. Analogously, the method can be used for manufacturing rotors, housings or shafts of expanders (e.g. screw expanders), vacuum pumps (e.g. vacuum jaws) or low pressure applications (e.g. screw loaders).
    According to a particular embodiment of the invention, the step of applying the coating to the patterned surface includes any coating assembly as described in European Patent Applications Nos. 14155385.9 and 14169341.9, where both are incorporated in their entirety by reference herein, at least for the purpose of providing technical characteristics with regard to the application of the coating and for the purpose of providing technical characteristics of the coating assembly itself. It will be clear that the invention is not limited to these specific coating compositions, but other types of coatings can also be used.
    Further, the polytetrafluoroethylene bonded solid lubricant as described in Chinese Patent Application No. CN 105132086 can be used as a coating material and can be applied according to any of the methods described in this Chinese Patent Application, which is incorporated herein by reference at least for providing technical features with regard to the application of the coating and for the purpose of providing technical characteristics of the coating composition itself.
    More specifically, the coating material used in a method according to the invention may be polytetrafluoroethylene bonded solid lubricant prepared with polyamideimide, resin and epoxy resin as binders, polytetrafluoroethylene, melamine cyanurate and molybdenum disulfide as solid lubricants and a diluent and may have various fillers and a cleaning additive. The lubricant can be coated on the surfaces of the machine part and subjected to heating and curing to form polytetrafluoroethylene bonded solid lubricant coating layers.
    A coating material used in a method according to the invention may contain a thermoplastic material such as, for example, but not exclusively polyaryletherketone (PAEK), polyetheretherketones (PEEK). Additives may also be included in the coating material such as, for example, aluminum oxide (A 1203), silicon dioxide (S102), glass (for example, borosilicate glass). Graphite may be added to the coating material, whether or not in combination with one of the compounds mentioned above.
    One of the following elements may be added to the coating material, alone or in combination with another compound or additive: hexagonal boron nitride;
    ° BE2020/5454 - carbon nanotubes (CNT): - talc; - polytetrafluoroethylene (PTFE), - perfluoroalkoxy polymer (for example perfluoroalkoxyalkane or PFA); - fluoroethylene propylene (FEP): - any other fluoropolymer; - silicone carbide (SiC).
    Alternatively, the composition of the coating material can be as follows: - polytetrafluoroethylene (954G 303 C Teflon, DuPont) 750-850 - amorphous graphite powder 300-400 - thinner for spray cleaners (8395 thinner, DuPont) 200-270 - methyl ethyl ketone (MEK ) 170-220 - cellosolve acetate coating additive (Syn Fac 800 resin) 200-300 A special formulation of the new coating can be as follows: - polytetrafluoroethylene (945G 303 C Teflon, DuPont) 800 - amorphous graphite powder 360 - thinner for spray cleaners (8395 thinner, DuPont) 240 - methyl ethyl ketone (MEK) 195 - cellosolve acetate coating additive (Syn Fac 800 resin) 240 Tests have shown that the step of applying a pattern to a surface of a machine part completely or partially eliminates the need from roughening that surface, for example by sandblasting, while a good adhesion of the coating material to the machine part can be ensured. Said machine part is typically a metal part, for example cast iron.
    The present invention further relates to a method for refurbishing a machine part, such as for example a rotor or rotor housing of a compressor, expander or vacuum pump, the method comprising the steps; a. removing a coating layer from a surface of said machine part by means of a laser; and B. applying a new or additional coating material to the laser treated surface.
    According to a further preferred embodiment of the invention, step a. is performed by means of a laser which applies a pattern to the surface.
    Figure 1 schematically illustrates the effect of applying the pattern 2 to a surface by means of a laser. The laser is a pulsed laser. The pulsed laser emits a laser beam at a predetermined frequency. The result is that the optical power arrives at an impact zone in pulses of a predetermined duration and frequency, typically with a predetermined repetition cycle. Such laser can be performed using various technologies.
    The laser used in the present invention is preferably a pulsed laser because the application has an advantage in generating pulses with a predetermined, large amount of energy. Since the pulse energy is equal to the average power divided by the repetition cycle, the predetermined amount of energy can be achieved by lowering the frequency of pulses so that more energy can be built up between pulses. For example, in laser erosion, a small volume of material can be vaporized from the surface of the workpiece including being heated one in a very short time, while the gradual application of energy would allow the heat to be absorbed into the mass of the part. , thus never reaching a temperature high enough at any given point.
    Referring to Figure 1, each circle segment illustrates the impact of a laser pulse on the surface to be treated. A circle segment is illustrated with reference numeral 1. It shows a three-dimensional coordinate system with X-Y-Z directions. In the example of Figure 1, the laser beam extends in the Z direction while the surface extends in the X and Y directions. To maximize the energy transferred from the laser to the surface, the laser beam is preferably oriented substantially perpendicular to the surface.
    When the laser beam is directed to the surface and operates at a predetermined operating frequency, the beam moves over the surface along a path 2. The paths 2a and 2b form a pattern 2 covering the surface to be treated. The pattern 2 contains multiple path segments. Figure 1 illustrates segments 2a and 2b placed at a path segment distance 4 from each other.
    The laser is configured with a laser beam diameter. Optical elements of the laser, in combination with the distance between the laser source and the surface, determine the diameter of the impact zone of the laser beam on the surface. The impact diameter is illustrated in Figure 1 with reference numeral 5. The laser preferably has a power output greater than 50 Watts, preferably greater than 70 Watts, more preferably greater than 90 Watts. Such power output, with a properly selected laser beam diameter, preferably provides an energy transfer to the surface that is greater than 8 J/cm”, preferably greater than 12 J/em”, more preferably greater than 18 J/cm”, most preferably higher than 23 J/cm”.
    The pulse frequency and speed at which the laser beam travels across the surface determines a distance between adjacent laser beam impact zones in a path segment of the surface. The
    ; BE2020/5454 distance is illustrated in figure 1 with reference numeral 3, and is measured as segment distance. Preferably the distance 3 is smaller than the diameter 5. The path segment distance is also preferably smaller than diameter 5.
    Tests and simulations have shown that a laser pulse impact on a metal surface typically by burning or evaporation removes the impurity such as grease, dirt, old coatings present on the surface. Furthermore, the laser pulse impact creates a miniature crater in the surface of the metal. The crater depth and shape is dependent on the type of metal, and can be determined experimentally by those skilled in the art. Laser pulse frequency and laser speed determine distance 3 between adjacent impact zones 1 in a single path segment 2a, 2b. Path segment distance 4 determines the distance between laser impact zones 1 in adjacent paths 2a, 2b. The pulse intensity determines the depth of the miniature crater in the surface, which forms the impact zones 1. The pulse diameter and the impact on the depth of the crater in the surface forming the impact zones 1. At least the above parameters can be balanced to obtain a predetermined roughness of the surface.
    The parameters are balanced to obtain a surface roughness higher than 1.0 Ra, preferably higher than 1.3 Ra and preferably also a surface roughness higher than 10.0 Ry, preferably higher than 15.0 Ry to obtain. Ra is defined as arithmetic mean value measured in µm of the absolute values of the profile deviations from the mean line within a sample length. The sampling length may be predetermined between 0.2 and 3.0 mm. The mean line is a reference line having the shape of the geometric profile and positioned such that within the sample length the sum of squares of the profile deviations from this line is minimal. Ry is defined as the distance measured mm between the highest profile peak and the lowest profile trough in the profile diagram, measured vertically, within the sample length. The measurement of the mathematical mean roughness Ra and Ry of the surface is preferably done in accordance with ISO 4287:1997. One skilled in the art can determine the parameters based on the teachings above to obtain a predetermined surface roughness. It will be appreciated that different surface materials will require different parameters.
    Preferably, the pattern is chosen to obtain a surface roughness of maximum 3 Ra, preferably maximum 2.7 Ra. Instead of increasing the roughness by applying a pattern, the roughness can also be decreased. In particular, by increasing the overlap between adjacent laser beam points, for example by decreasing the path segment distance 4 and/or decreasing the speed to decrease the distance between adjacent laser beam impact zones against a path segment, the roughness can be lowered.
    Figure 2 shows an example of a surface treated by laser patterning. In Figure 2, several adjacent path segments are shown,
    ) BE2020/5454 in analogy with figure 1. The result 1s that the surface shows a pattern composed by several adjacent craters formed on the surface. The presence of these craters means that any impurity present on the surface prior to patterning has been removed by the laser. These craters, especially due to their relative position and to each other, give the surface a roughness. The roughness ensures that the coating adheres well, as described above.
    Figure 3 shows another example of a surface treated by laser patterning. In Figure 3, the adjacent path distance 4 is larger than the diameter 5. The result is that between the paths 2, strips of untreated surface areas 6 can be observed. For some surfaces to be treated, this may be sufficient to obtain the predetermined roughness. This may be sufficient to obtain sufficient adhesion of the coating despite the presence of apparently untreated surface areas 6. Because these apparently untreated surface areas 6 are enclosed by treated surface areas, impurities such as grease are removed and the untreated surface area 6 becomes sufficient. cleaned. Separate cleaning steps may be required to remove impurities from the surface at least prior to coating application. Such separate cleaning steps will be largely superfluous when the laser beam irradiates the entire surface by means of the pattern.
    The laser beam mainly irradiates the entire surface when the laser beam speed along the path 2 is selected such that adjacent laser beam impact zones have a center to center distance 3 that is smaller than the laser impact diameter 5 and when the distance between the paths 2a and 2b is more cramped than the impact diameter 5.
    Figure 4 illustrates an apparatus 10 in which at least part of the method of the invention can be performed. The device 10 includes a laser source 11 and optical elements 12 for emitting a laser beam 13 . The device 10 further comprises a support 14 for a machine part being a rotor 15 of a compressor, preferably a rotor 15 for an oil-free screw compressor. The device preferably includes a user interface 16 to allow a user to control the operation settings of the device 10 . The user interface 16 is shown as an integral part of the device 10. It will be appreciated that the direction 10 alternatively has a communication module such that an external user interface 16 can be operatively connected to the device 10.
    The invention has been especially developed for treating surfaces of rotors 15 and housing parts of oil-free compressors. The coatings of such machine parts are applied with high mechanical precision and the machine parts with the coatings are used in extreme conditions. Therefore, a pre-treatment of the surface to ensure that the coating can be applied optimally is advantageous.
    When a pattern is applied to a surface having a complex three-dimensional shape such as the surface of a rotor 15, the device 10 preferably includes at least three degrees of freedom, more preferably 4 degrees of freedom, most preferably 5 degrees of freedom.
    In the example shown, the rotor 15 is rotatable about an upright axis.
    Furthermore, at least the optical elements 12 of the laser, and preferably also the laser source, are movable up and down, illustrated by arrow 17, and can be moved toward and away from the machine part 15, as illustrated by arrow 18. the optical elements 12 of the laser and more preferably on the laser source 11 are rotatable about a horizontal axis such that the laser beam 13 can be oriented partly downwards and partly upwards towards the rotor 15. This allows the laser beam 15 to move substantially perpendicular to the surface to be achieved even when different surface segments have different orientations with respect to the rotor axis.
    Alternatively, the rotor 15 may be rotated about a horizontal axis to change the angle of impact of the laser beam 13 relative to the upward axis of the rotor 15 .
    By operating various movements of the device 10, the laser beam 13 can be directed towards the rotor surface, at least for most of the surface, in a substantially perpendicular manner.
    The same technique can be used to treat parts of a compressor housing, as will be explained below with reference to Figure 6. An alternative arrangement can also be used in which a laser beam is mounted at a distance from the laser beam exit, and where optical elements determine the location checking the laser beam exit and the direction in which the laser beam extends.
    Figure 5 illustrates multiple patterns for treating a surface.
    Figure 5A shows a pattern of which several separate parallel path segments 2A, 2B, ... 2E lie next to each other.
    As described above, the distance between adjacent path segments 2 can be selected to obtain the preferred surface treatment.
    Figure 5B shows a pattern containing a single path that snakes across the surface.
    Such a single path can be seen as several parallel path segments 2A, 2B, ... 2E connected to each other, which path segments are adjacent to each other.
    As described above, the distance between adjacent path segments 2 can be selected to obtain the preferred surface treatment.
    The pattern of Figure 5B is advantageous because it allows time efficient use of the laser.
    The path is continuous such that the laser can operate with a minimum of interruptions.
    Figure 5C shows a pattern including a single path winding across the surface with multiple path segments not parallel.
    The figure shows two zones 2F and 2G, and shows that the orientation of the path segments in zone 2F is different from the orientation of the
    U BE2020/5454 path segments in zone 2G. However, the pattern is chosen in such a way that adjacent path segments have a predetermined maximum distance from each other to achieve the preferred surface treatment.
    Figure 5D shows a further pattern including a spiral path. As an alternative to the spiral, concentric circles can be formed. In the spiral path shown, spiral segments, which can be freely defined, for example as shown in the figure, can be positioned a predetermined distance from each other to obtain the predetermined surface treatment.
    The arrangement of Figure 4 is provided for patterning a machine part having a substantially outwardly facing surface. An outward facing surface is a surface whose perpendicular path points away from the center of the machine part. In addition, the perpendicular to the surface typically does not intersect with any other part of the machine part. In other words, a predominantly outwardly facing surface has a plurality of convex surface segments.
    The arrangement of Figure 6 is provided for patterning a machine part having a substantially inwardly facing surface. An inwardly facing surface is a surface whose surface of the perpendicular to the surface faces at least partially towards the center of the machine part. Typically, the perpendicular to an inward-facing surface intersects, or at least comes close to, another part of the machine part. In other words, a substantially inwardly facing surface has a plurality of concave surface segments.
    Figure 6 illustrates an arrangement for applying a cartridge to a housing of a compressor, for example an oil-free screw compressor. Figure 6A illustrates a cross-section and Figure 6B a top view. The arrangement includes a laser source 11. A light guide arrangement typically includes one or more mirrors and is arranged to direct laser light to a laser beam exit 19. The laser beam exit 19 is adapted to move within the housing. This is partially illustrated by arrows 20 and 21 in Figure 6A, and is partially illustrated by the rotation arrow 22 in Figure 6B. Those skilled in the art understand that a combined motion can rotate in a laser beam output 19 that faces the inwardly facing surface 23 to follow a predetermined path that forms a pattern.
    The invention is not limited to embodiments described above by way of example, or to method steps listed above to illustrate the invention, however, the method according to the invention for manufacturing a machine part can be realized in many ways, without deviate from the scope of protection.
    权利要求:
    Claims (15)
    [1]
    A method for treating a surface of a machine part (15, 24), the method comprising the steps of: - applying a pattern (2) to the surface of the machine part (15, 24) by means of a laser ( 11, 12, 13); - applying a coating to the patterned surface.
    [2]
    The method of claim 1, wherein the method further comprises manufacturing the machine part (15, 24).
    [3]
    A method according to claim 1 or 2, wherein said machine part (15, 24) is selected from a group consisting of at least part of a screw rotor (15) for an oil-free screw compressor and at least part of a housing element (24) for such an oil-free screw compressor.
    [4]
    Method according to any one of claims 1 to 3, wherein the step of applying a pattern (2) comprises: - determining at least one path (2a, 2b, ... 2g) on the surface such that the at least one path extends over the surface; - operating the laser (11, 12, 13) in such a way that a laser beam (13) from the laser strikes the surface on the at least one path (2a, 2b, ... 28).
    [5]
    The method of claim 4, wherein the laser (11, 12, 13) is directed toward the surface such that the laser beam (13) strikes the surface at an angle of approximately 90 degrees.
    [6]
    The method of claim 4 or 5, wherein operating the laser (11, 12, 13) includes moving the laser (11, 12, 13) relative to the surface such that a point of tangency of the laser beam (13 ) mentioned at least one path (2a, 2b, … 29) follows at a predetermined speed.
    [7]
    A method according to any one of claims 4 to 6, wherein the laser comprises a pulsed laser source (11) and wherein operating the laser (11, 12, 13) comprises sending the laser beam (13) at a predetermined operating frequency and a predetermined operating intensity.
    [8]
    A method according to claims 6 and 7, wherein the predetermined speed and the predetermined operating frequency m are kept in a predetermined relationship to each other.
    [9]
    A method according to claim 8, wherein the predetermined ratio is selected so that successive laser beam points (1) exhibit a point-to-point distance (3) with respect to each other which is tighter than a laser surface impact diameter (5).
    [10]
    A method according to claim 9, wherein at least one path (2a, 2b, ... 29) comprises a plurality of adjacent path segments, the adjacent path segments exhibiting a center-to-center distance (4) that is less than the laser surface impact diameter (5) .
    [11]
    Method according to one of the preceding claims 1 to 10, wherein the application of a pattern (2) is parameterized to obtain a surface roughness of the surface greater than 1.0 Ra, preferably greater than 1.3 Ra and optionally, a surface roughness of the surface greater than 10.0 Ry, preferably greater than 15.0 Ry.
    [12]
    A method according to any one of claims 1 to 11, wherein the coating is applied in multiple layers.
    [13]
    A method according to any one of claims 1 to 12, further comprising applying a first coating layer to the surface of the machine part before the patterning step (2) and wherein applying a coating comprises applying a second coating layer on the patterned surface.
    [14]
    A method according to any one of claims 1 to 13, wherein the coating has one of the compositions described in European Patent Application No. 14155385.9, European Patent Application No. 17169341.9 and Chinese Patent Application No. CN 105132086.
    [15]
    An oil-free screw compressor comprising a rotor (15) and a housing (24) at least one of which is at least partially treated according to any one of claims 1 to
    14.
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    同族专利:
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    CN114025909A|2022-02-08|
    WO2020260192A1|2020-12-30|
    BE1027351A1|2021-01-13|
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    法律状态:
    2021-10-27| FG| Patent granted|Effective date: 20211014 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201962865357P| true| 2019-06-24|2019-06-24|
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