A method for machining inner raceway of stator ring

Abstract

The present invention relates to the technical field of plunger pump parts processing, and specifically, to a method for processing a stator ring inner track. The stator ring inner track processing method comprises: based on the completion of the initial positioning of the stator ring semi-finished product and the grinding wheel, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a first path. Based on the completion of the grinding wheel processing along the first path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a second path. Among them, the stator ring semi-finished product is sequentially provided with a first dividing point, a first inflection point, a second dividing point, a second inflection point and a target dividing point. The inner circle trajectory of the stator ring semi-finished product between the first dividing point and the second dividing point is the first trajectory, and the first path covers the first trajectory. The inner circle trajectory of the stator ring semi-finished product between the second dividing point and the target dividing point is the second trajectory, and the second path covers the second trajectory. In this way, the problem of the difficulty of grinding processing caused by the complex trajectory of the stator ring inner track is solved.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pump parts processing, and in particular to a method for processing a stator ring inner raceway. Background Art

[0002] The plunger pump is an indispensable part of the space shuttle, providing power for the hydraulic system. In the plunger pump, the stator ring and the rotor cooperate with each other, and a circular inner track with a changing radius is provided on the inner circumferential wall of the stator ring. The function of the circular inner track is to allow the rotor to orbit along the theoretical curve while completing its rotation. The track radius of the inner track changes gradually, and the precision requirement is high, which makes the processing difficult.

[0003] Currently, the common processing method often uses grinding to process the track on the inner wall of the stator ring. However, due to the irregular track contour, complex tool path, easy wear of the grinding wheel, and the need for repeated resting of the grinding wheel, it is difficult to control the accuracy during the processing. Therefore, the processing method of the track inside the stator ring still needs to be improved to optimize the processing steps while ensuring the processing accuracy. Summary of the invention

[0004] In order to solve the problem of difficulty in grinding caused by complex track of the inner track of the stator ring, the present invention provides a method for machining the inner track of the stator ring, comprising:

[0005] Step S10, based on the completion of the initial positioning of the stator ring semi-finished product and the grinding wheel, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a first path;

[0006] Wherein, the stator ring semi-finished product is annular; the inner ring of the stator ring semi-finished product is provided with a first dividing point, a first inflection point, a second dividing point, a second inflection point and a target dividing point at intervals of a preset central angle; the first dividing point and the second dividing point are respectively at an equal distance from the center of the stator ring semi-finished product and are a first radius; the first inflection point and the second inflection point are respectively at an equal distance from the center of the stator ring semi-finished product and are a second radius; the first radius is smaller than the second radius; the inner ring radius of the stator ring semi-finished product gradually changes along the circumferential direction; the inner ring trajectory of the stator ring semi-finished product between the first dividing point and the second dividing point is a first trajectory; the first path covers the first trajectory; the starting end of the first path extends to the side of the first dividing point away from the first inflection point; the ending end of the first path extends to the side of the second dividing point away from the first inflection point;

[0007] Step S20, based on the grinding wheel completing the processing along the first path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the second path;

[0008] Among them, the inner ring trajectory of the stator ring semi-finished product between the second dividing point and the target dividing point is the second trajectory; the target dividing point coincides with or has a gap with the first dividing point; the second path covers the second trajectory; the starting end of the second path extends to the side of the second dividing point away from the second inflection point; the ending end of the second path extends to the side of the target dividing point away from the second inflection point.

[0009] In some embodiments, the stator ring inner track processing method further includes:

[0010] Step S30, based on the grinding wheel completing the processing along the second path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a third path;

[0011] Among them, the inner circle of the stator ring semi-finished product is sequentially provided with a third dividing point, a third inflection point, a fourth dividing point and a fourth inflection point at intervals of the preset center angle; the preset center angle is 45°; the third dividing point coincides with the target dividing point; the third dividing point is located between the second inflection point and the third inflection point; the distances from the third dividing point and the fourth dividing point to the center of the stator ring semi-finished product are respectively equal to the first radius; the distances from the third inflection point and the fourth inflection point to the center of the stator ring semi-finished product are respectively equal to the second radius; the inner circle trajectory of the stator ring semi-finished product between the third dividing point and the fourth dividing point is the third trajectory; the third path covers the third trajectory; the starting end of the third path extends to the side of the third dividing point away from the third inflection point; the ending end of the third path extends to the side of the fourth dividing point away from the third inflection point.

[0012] In some embodiments, the stator ring inner track processing method further includes:

[0013] Step S40, based on the completion of the processing of the grinding wheel along the third path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the fourth path; the inner ring trajectory of the stator ring semi-finished product between the fourth dividing point and the first dividing point is the fourth trajectory; the fourth path covers the fourth trajectory; the starting end of the fourth path extends to the side of the fourth dividing point away from the fourth inflection point; the ending end of the fourth path extends to the side of the first dividing point away from the fourth inflection point.

[0014] In some embodiments, the tangents of the inner ring trajectory of the stator ring semi-finished product at the first dividing point and the second dividing point are respectively the first tangent and the second tangent; the moving direction of the grinding wheel at the starting end of the first path gradually becomes parallel to the first tangent; the moving direction of the grinding wheel at the ending end of the first path gradually becomes perpendicular to the second tangent.

[0015] In some embodiments, the starting end and the ending end of the first path are both arcs; the radius of the arc at the starting end of the first path is smaller than the radius of the arc at the ending end of the first path; the starting end and the ending end of the first path are tangent to the first trajectory respectively.

[0016] In some embodiments, the starting end and the ending end of the second path are both arcs; the arc radius of the starting end of the second path is smaller than the arc radius of the ending end of the second path; the starting end and the ending end of the second path are tangent to the second trajectory respectively; the arc radius of the starting end of the second path is equal to the arc radius of the ending end of the first path.

[0017] In some embodiments, the starting end and the ending end of the third path are both arcs; the arc radius of the starting end of the third path is smaller than the arc radius of the ending end of the third path; the starting end and the ending end of the third path are tangent to the third trajectory respectively; the arc radius of the starting end of the third path is equal to the arc radius of the ending end of the second path.

[0018] In some embodiments, the starting end and the ending end of the fourth path are both arcs; the arc radius of the starting end of the fourth path is smaller than the arc radius of the ending end of the fourth path; the starting end and the ending end of the fourth path are tangent to the fourth trajectory respectively; the arc radius of the starting end of the fourth path is equal to the arc radius of the ending end of the third path.

[0019] In some embodiments, the stator ring inner track processing method further includes:

[0020] Step S50, based on the completion of the processing of the grinding wheel along the fourth path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the fifth path; the fifth path covers the first trajectory, the second trajectory, the third trajectory and the fourth trajectory; the rotation direction of the fifth path around the center of the stator ring semi-finished product is opposite to the rotation direction of the first path around the center of the stator ring semi-finished product.

[0021] In some embodiments, in step S10, the rotation direction of the grinding wheel is opposite to the rotation direction of the first path around the stator ring semi-finished product;

[0022] In the step S20, the rotation direction of the grinding wheel is opposite to the rotation direction of the second path around the stator ring semi-finished product;

[0023] In the step S30, the rotation direction of the grinding wheel is opposite to the rotation direction of the third path around the stator ring semi-finished product;

[0024] In the step S40, the rotation direction of the grinding wheel is opposite to the rotation direction of the fourth path around the stator ring semi-finished product;

[0025] In the step S50, the rotation direction of the grinding wheel is the same as the rotation direction of the fifth path around the stator ring semi-finished product.

[0026] In order to solve the problem of difficulty in machining the inner track of the stator ring, the present invention has the following advantages:

[0027] The processing of the annular inner track of the stator ring is divided into at least two steps, and the feed and retract of each processing are designed as arc tracks. The arc feed and retract can achieve a smooth transition between the grinding wheel and the workpiece, reduce the impact and vibration caused by sudden cutting in or out, and thus improve the grinding accuracy. In addition, since the grinding wheel is constantly worn during the processing, the present invention gradually increases the arc radius of the retract and feed to avoid processing errors, and the retract of the first processing can reduce the resistance for the feed of the second processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a process flow of a method for machining a raceway in a stator ring according to an embodiment is shown;

[0029] Figure 2 A schematic diagram of a method for machining a raceway in a stator ring according to an embodiment is shown;

[0030] Figure 3 A schematic cross-sectional view of a semi-finished stator ring of an embodiment is shown;

[0031] Figure 4 A schematic diagram of a first path for machining a raceway in a stator ring according to an embodiment is shown;

[0032] Figure 5 A schematic diagram of a second path for machining a raceway in a stator ring according to an embodiment is shown;

[0033] Figure 6 A schematic diagram of a third path for machining a raceway in a stator ring according to an embodiment is shown;

[0034] Figure 7 A schematic diagram of a fourth path for machining a raceway in a stator ring according to an embodiment is shown;

[0035] Figure 8A schematic cross-sectional view of a finished product inside a stator ring of an embodiment is shown.

[0036] Figure numerals: 10 stator ring body; 20 annular inner track; 30 stator ring semi-finished product; 31 first dividing point; 32 first inflection point; 33 second dividing point; 34 second inflection point; 35 third dividing point; 36 third inflection point; 37 fourth dividing point; 38 fourth inflection point; 40 grinding wheel; 41 grinding wheel rod; 42 grinding wheel disc; 50 first path; 60 second path; 70 third path; 80 fourth path. DETAILED DESCRIPTION

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0038] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0039] In a plunger pump, Figure 8 As shown, an annular inner track 20 is provided on the inner circumferential wall of the stator ring body 10, and the rotor can cooperate with the annular inner track 20 and rotate along its track. The trajectory radius of the annular inner track 20 changes gradually, and the precision requirement is relatively high. The common processing method currently often uses grinding to process the track on the inner circumferential wall of the stator ring. However, due to the irregular track contour, complex tool path, and the grinding wheel 40 is prone to wear and the need to repeatedly rest the grinding wheel 40, it is difficult to control the precision during the processing. In this embodiment, a method for processing the inner track of a stator ring is provided, such as Figure 1 As shown, the stator ring inner track processing method may include steps S10 to S20, and each step is described in detail as follows:

[0040] Step S10 , based on the completion of the initial positioning of the stator ring semi-finished product 30 and the grinding wheel 40 , the grinding wheel 40 is controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the first path 50 .

[0041] Among them, Figure 3 As shown, the stator ring semi-finished product 30 is annular, and the outer ring of the stator ring semi-finished product 30 is circular. The first dividing point 31, the first inflection point 32, the second dividing point 33, the second inflection point 34 and the target dividing point are sequentially arranged on the stator ring semi-finished product 30 at preset central angles. The distances from the first dividing point 31 and the second dividing point 33 to the center of the stator ring semi-finished product 30 are equal and are the first radius, and the radii from the first inflection point 32 and the second inflection point 34 to the center of the stator ring semi-finished product 30 are equal and are the second radius. The first radius is smaller than the second radius. The inner ring radius of the stator ring semi-finished product 30 gradually changes along the circumferential direction. The inner ring trajectory of the stator ring semi-finished product 30 between the first dividing point 31 and the second dividing point 33 is the first trajectory, and the first path 50 covers the first trajectory. As shown Figure 4 As shown, the starting end of the first path 50 extends to the side of the first dividing point 31 away from the first inflection point 32; the terminal end of the first path 50 extends to the side of the second dividing point 33 away from the first inflection point 32. The first path 50 is the tool path of the first step of processing. The first path 50 uses the starting end close to the first dividing point 31 as the starting point for arc feed, so that the arc path of feed can be tangent to the first trajectory, and the tangent point is the first dividing point 31. The first path 50 can start arc retraction from the second dividing point 33, and the retraction path is also tangent to the first trajectory. Through arc feed and retraction, a smooth transition between the grinding wheel 40 and the workpiece can be achieved, reducing the resistance caused by sudden changes in the cutting-in or cutting-out angles, while reducing the impact and vibration of the grinding wheel 40 during grinding, thereby improving the grinding accuracy.

[0042] Step S20 , based on the grinding wheel 40 completing the machining along the first path 50 , controlling the grinding wheel 40 to grind the inner circumferential wall of the stator ring semi-finished product 30 along the second path 60 .

[0043] The inner circle track of the stator ring semi-finished product 30 between the second separation point 33 and the target separation point is the second track, and the target separation point coincides with or has a gap with the first separation point 31. The second path 60 covers the second track. Figure 5 As shown, the starting end of the second path 60 extends to the side of the second dividing point 33 away from the second inflection point 34, and the terminal end of the second path 60 extends to the side of the target dividing point away from the second inflection point 34. The second path 60 is the tool path of the second step processing. The second path 60 uses the starting end close to the second dividing point 33 as the starting point for arc feed, so that the arc path of the feed can be tangent to the second trajectory, and the tangent point is the second dividing point 33. The second path 60 can start the arc retraction from the target dividing point, and the retraction path is also tangent to the second trajectory. Through arc feed and retraction, a smooth transition between the grinding wheel 40 and the workpiece can be achieved, reducing the grinding resistance caused by the sudden change of the cutting-in or cutting-out angle, thereby reducing the impact and vibration, thereby improving the grinding accuracy.

[0044] It should be understood that in some embodiments, the target separation point coincides with the first separation point 31, that is, the preset center angle is 90°. Thus, the stator ring inner track processing method of the present invention can process an ellipse or an ellipse-like track. In some embodiments, the center angle interval between the target separation point and the first separation point 31 is 120°, that is, the preset center angle is 60°. In some embodiments, the center angle interval between the target separation point and the first separation point 31 is 90°, that is, the preset center angle is 45°.

[0045] In some other embodiments, step S20 includes step S21 and step S22.

[0046] Step S21 , based on the grinding wheel 40 being processed along the first path 50 , the grinding wheel 40 is repaired.

[0047] Step S22, based on the grinding wheel 40 being cleaned, the grinding wheel 40 is controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the second path 60. Therefore, the processing path is divided into multiple sections, so that the grinding wheel 40 can be cleaned in time, and the processing error caused by the complex change of the contour radius of the annular inner runway 20 and the wear of the grinding wheel 40 and the adhesion of grinding debris can be reduced, and finally the purpose of improving the processing accuracy is achieved.

[0048] In addition, the arc path of the first step of tool retraction is ground appropriately for the second step of tool feed path processing, so that the first step of tool retraction path can reduce the resistance for the second step of tool feed processing, so as to further improve the overall grinding processing accuracy of the product.

[0049] In some embodiments, the method for processing the inner track of the stator ring also includes bonding of the grinding wheel 40. The grinding wheel 40 may include a grinding wheel 40 rod and a grinding wheel 40 sheet, and the grinding wheel 40 rod and the grinding wheel 40 sheet may be bonded together by a mixed adhesive. The mixed adhesive may be a mixture of copper oxide powder passing through a 240-mesh screen and phosphate glue in a ratio of 4:1. Before bonding, the grinding wheel 40 rod may be roughened with an emery cloth having a particle size of 120, and the inner hole of the grinding wheel 40 sheet may be polished at the same time, so that the hole size and the gap between the bonding part of the grinding wheel 40 rod are controlled within 0.1~0.15mm. After bonding, the bonded grinding wheel 40 may be placed between two 20W bulbs, with the spacing controlled within 15-20MM. The detailed bonding state may be observed at any time in conjunction with the brightness of the bulb, and the grinding wheel 40 is completely bonded after a standing time of 1-2 hours.

[0050] The temperature of the outer periphery of the bulb is between 30° and 50°, which is milder than other heat sources and can make the bonding structure more stable. A good heating environment can significantly reduce the waiting time for solidification, improve the bonding efficiency and bonding effect of the grinding wheel 40, and thus improve the overall grinding stability of the grinding wheel 40 in high-hardness profiling.

[0051] In this embodiment, the stator ring inner track processing method further includes step S30, which is described in detail as follows:

[0052] Step S30 , based on the grinding wheel 40 completing the machining along the second path 60 , controlling the grinding wheel 40 to grind the inner circumferential wall of the stator ring semi-finished product 30 along the third path 70 .

[0053] Among them, Figure 3 As shown, the inner circle interval preset center angle of the stator ring semi-finished product 30 is sequentially provided with a third dividing point 35, a third inflection point 36, a fourth dividing point 37 and a fourth inflection point 38, and the preset center angle is 45°. At this time, the third dividing point 35 coincides with the target dividing point; the third dividing point 35 is located between the second inflection point 34 and the third inflection point 36. The distances from the third dividing point 35 and the fourth dividing point 37 to the center of the stator ring semi-finished product 30 are respectively equal to the first radius, and the distances from the third inflection point 36 and the fourth inflection point 38 to the center of the stator ring semi-finished product 30 are respectively equal to the second radius. The inner circle trajectory of the stator ring semi-finished product 30 between the third dividing point 35 and the fourth dividing point 37 is the third trajectory, and the third path 70 covers the third trajectory. As shown Figure 6As shown, the starting end of the third path 70 extends to the side of the third dividing point 35 away from the third inflection point 36, and the terminal end of the third path 70 extends to the side of the fourth dividing point 37 away from the third inflection point 36. The third path 70 is the tool path of the third step of processing. The third path 70 uses the starting end close to the third dividing point 35 as the starting point for arc feed, so that the arc path of feed can be tangent to the third trajectory, and the tangent point is the third dividing point 35. The third path 70 can start arc retraction from the fourth dividing point 37, and the retraction path is also tangent to the third trajectory. Through arc feed and retraction, a smooth transition between the grinding wheel 40 and the workpiece can be achieved, reducing the grinding resistance caused by sudden changes in the cutting-in or cutting-out angles, thereby reducing impact and vibration, thereby improving grinding accuracy.

[0054] In some other embodiments, step S30 includes step S31 and step S32.

[0055] Step S31 , based on the grinding wheel 40 being processed along the second path 60 , the grinding wheel 40 is repaired.

[0056] Step S32, based on the grinding wheel 40 being cleaned, the grinding wheel 40 is controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the third path 70. Therefore, the processing path is divided into multiple sections, so that the grinding wheel 40 can be cleaned in time, and the processing error caused by the complex change of the contour radius of the annular inner runway 20 and the wear of the grinding wheel 40 and the adhesion of grinding debris can be reduced, and finally the purpose of improving the processing accuracy is achieved.

[0057] In addition, the arc path of the tool retraction in the second step performs appropriate grinding for the tool feed path processing in the third step, so that the tool retraction path in the second step can reduce the resistance for the tool feed in the third step, so as to further improve the overall grinding processing accuracy of the product.

[0058] In this embodiment, the method for machining the inner track of the stator ring further includes step S40, which is described in detail as follows:

[0059] Step S40 , based on the grinding wheel 40 completing the machining along the third path 70 , controlling the grinding wheel 40 to grind the inner circumferential wall of the stator ring semi-finished product 30 along the fourth path 80 .

[0060] The inner circle trajectory of the stator ring semi-finished product 30 between the fourth dividing point 37 and the first dividing point 31 is the fourth trajectory, and the fourth path 80 covers the fourth trajectory. Figure 7As shown, the starting end of the fourth path 80 extends to the side of the fourth dividing point 37 away from the fourth inflection point 38, and the terminal end of the fourth path 80 extends to the side of the first dividing point 31 away from the fourth inflection point 38. The fourth path 80 is the tool path of the fourth step processing. The fourth path 80 uses the starting end close to the third dividing point 35 as the starting point for arc feed, so that the arc path of the feed can be tangent to the fourth trajectory, and the tangent point is the fourth dividing point 37. The fourth path 80 can start the arc retraction from the first dividing point 31, and the retraction path is also tangent to the fourth trajectory. Through the arc feed and retraction, a smooth transition between the grinding wheel 40 and the workpiece can be achieved, and the grinding resistance caused by the sudden change of the cutting-in or cutting-out angle is reduced, thereby reducing the impact and vibration, thereby improving the grinding accuracy. In other embodiments, step S40 includes step S41 and step S42.

[0061] Step S41 , based on the grinding wheel 40 being processed along the third path 70 , the grinding wheel 40 is repaired.

[0062] Step S42, based on the grinding wheel 40 being cleaned, the grinding wheel 40 is controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the fourth path 80. Therefore, the processing path is divided into multiple sections, so that the grinding wheel 40 can be cleaned in time, and the processing error caused by the complex change of the contour radius of the annular inner runway 20 and the wear of the grinding wheel 40 and the adhesion of grinding debris can be reduced, and finally the purpose of improving the processing accuracy is achieved.

[0063] In addition, the arc path of the tool retraction in the third step performs appropriate grinding for the tool feed path processing in the fourth step, so that the tool retraction path in the third step can reduce the resistance for the tool feed in the fourth step, so as to further improve the overall grinding processing accuracy of the product.

[0064] In this embodiment, the tangents of the inner circle trajectory of the stator ring semi-finished product 30 at the first dividing point 31 and the second dividing point 33 are the first tangent and the second tangent, respectively. The moving direction of the grinding wheel 40 at the starting end of the first path is gradually parallel to the first tangent; the moving direction of the grinding wheel at the ending end of the first path is gradually perpendicular to the second tangent.

[0065] In other embodiments, the tangents of the inner ring trajectory of the stator ring semi-finished product 30 at the third dividing point 35 and the fourth dividing point 37 are the third tangent and the fourth tangent, respectively. The travel direction of the grinding wheel 40 at the starting end of the second path is gradually parallel to the second tangent; the travel direction of the grinding wheel 40 at the ending end of the second path is gradually perpendicular to the third tangent. The travel direction of the grinding wheel 40 at the starting end of the third path is gradually parallel to the third tangent; the travel direction of the grinding wheel 40 at the ending end of the third path is gradually perpendicular to the fourth tangent. The travel direction of the grinding wheel 40 at the starting end of the fourth path is gradually parallel to the fourth tangent; the travel direction of the grinding wheel 40 at the ending end of the fourth path is gradually perpendicular to the first tangent.

[0066] In this embodiment, if Figure 4 As shown, the starting end and the ending end of the first path 50 are both arcs, and the starting end and the ending end of the first path 50 are tangent to the first trajectory respectively. The radius of the arc at the starting end of the first path 50 can be smaller than the radius of the arc at the ending end of the first path 50. Since the grinding wheel 40 will wear during the processing, it is easy to cause insufficient processing depth near the end of the tool path, resulting in poor product precision. Therefore, setting the radius of the arc at the ending end to be larger can make the tool withdrawal route closer to the inner circumferential wall of the stator ring finished product, thereby ensuring the processing depth and product processing precision of the end section of the first trajectory when withdrawing the tool.

[0067] In this embodiment, if Figure 5 As shown, the starting end and the ending end of the second path 60 are both arcs, and the starting end and the ending end of the second path 60 are tangent to the second trajectory respectively. The arc radius of the starting end of the second path 60 can be smaller than the arc radius of the ending end of the second path 60, and the arc radius of the starting end of the second path 60 can be equal to the arc radius of the ending end of the first path 50. Since the grinding wheel 40 will wear during the processing, it is easy to cause the processing accuracy of the position near the end of the tool path to be poor. Therefore, the arc radius of the ending end is set to be larger, so that the path of the tool withdrawal can be closer to the inner circumferential wall of the finished product of the stator ring, thereby ensuring that the processing accuracy of the end section of the first trajectory is higher when the tool is withdrawn. At the same time, the tool path of the ending end of the first step processing reduces the resistance for the tool feed at the starting end of the second step processing. Since the wear of the grinding wheel 40 at the ending end of the first path 50 and the starting end of the second path 60 is basically the same, the arc trajectory of the starting end of the second path 60 and the arc trajectory of the ending end of the first path 50 are set to be equal, which can ensure the consistency of the processing depth at the same position twice, thereby ensuring the processing accuracy of the product.

[0068] In this embodiment, if Figure 6 As shown, the starting end and the ending end of the third path 70 are both arcs, and the starting end and the ending end of the third path 70 are tangent to the third trajectory respectively. The arc radius of the starting end of the third path 70 can be smaller than the arc radius of the ending end of the third path 70; the arc radius of the starting end of the third path 70 can be equal to the arc radius of the ending end of the second path 60. Since the grinding wheel 40 will wear during the processing, it is easy to cause poor processing accuracy near the end of the tool path. Therefore, setting the arc radius of the ending end to be larger can make the retraction route closer to the inner circumferential wall of the stator ring finished product, thereby ensuring that the processing accuracy of the end section of the first trajectory is higher when retracting. At the same time, the tool path of the ending end of the second step processing reduces the resistance for the feed at the starting end of the third step processing.

[0069] In this embodiment, if Figure 7As shown, the starting end and the ending end of the fourth path 80 are both arcs, and the starting end and the ending end of the fourth path 80 are tangent to the fourth trajectory respectively. The arc radius of the starting end of the fourth path 80 can be smaller than the arc radius of the ending end of the fourth path 80, and the arc radius of the starting end of the fourth path 80 can be equal to the arc radius of the ending end of the third path 70. Since the grinding wheel 40 will wear out during the processing, it is easy to cause poor processing accuracy near the end of the tool path. Therefore, setting the arc radius of the ending end to be larger can make the retraction route closer to the inner circumferential wall of the stator ring finished product, thereby ensuring that the processing accuracy of the end section of the first trajectory is higher when retracting. At the same time, the tool path of the ending end of the third step processing reduces the resistance for the feed at the starting end of the fourth step processing.

[0070] In this embodiment, the method for processing the inner track of the stator ring further includes:

[0071] Step S50, based on the grinding wheel 40 completing the processing along the fourth path 80, the grinding wheel 40 can be controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the fifth path. The fifth path covers the first track, the second track, the third track and the fourth track. The rotation direction of the fifth path around the center of the stator ring semi-finished product 30 is opposite to the rotation direction of the first path 50 around the center of the stator ring semi-finished product 30. The processing of the stator ring semi-finished product in steps S10 to S40 is rough processing, and the processing step of step S50, that is, the grinding processing along the fifth path, is fine processing, and the part with insufficient precision during the rough processing process can be further ground. In addition, the rotation direction around the center of the stator ring semi-finished product 30 during the processing is opposite to the rough processing, which can improve the precision of the processed surface, remove burrs, protrusions and other undesirable defects, and make the workpiece surface smoother, thereby meeting the needs of high-precision workpieces.

[0072] In step S10 to step S40, the depth feed is increased by 0.003 mm each time the next step is performed, and the processing is stopped when the minimum tolerance is reached.

[0073] In some other embodiments, step S50 includes steps S51 to S53.

[0074] Step S51, based on the grinding wheel 40 completing the processing along the fourth path 80, use alcohol to cool the fourth track of the stator ring semi-finished product 30 to room temperature; this can prevent the grinding heat in step S40 from affecting the size of the entire part processing.

[0075] Step S52, based on the fourth track of the stator ring semi-finished product 30 cooling to room temperature, the grinding wheel 40 is repaired and a compensation of +0.005mm in the ball diameter direction of the grinding wheel 40 is given. In addition, a tool projector can also be used to check and inspect the grinding dimensions.

[0076] In step S53, based on the completion of the repair and size compensation of the grinding wheel 40, the grinding wheel 40 can be controlled to grind the inner circumferential wall of the stator ring semi-finished product 30 along the fifth path. By performing size compensation on the grinding wheel 40, the tool deflection caused by the reverse grinding in step S53 can be resisted.

[0077] In this embodiment, if Figure 2 As shown, the method for processing the inner track of the stator ring may also include:

[0078] In step S10, the rotation direction of the grinding wheel 40 may be opposite to the rotation direction of the first path 50 around the stator ring semi-finished product 30;

[0079] In step S20, the rotation direction of the grinding wheel 40 may be opposite to the rotation direction of the second path 60 around the stator ring semi-finished product 30;

[0080] In step S30, the rotation direction of the grinding wheel 40 may be opposite to the rotation direction of the third path 70 around the stator ring semi-finished product 30;

[0081] In step S40, the rotation direction of the grinding wheel 40 may be opposite to the rotation direction of the fourth path 80 around the stator ring semi-finished product 30;

[0082] In step S50 , the rotation direction of the grinding wheel 40 may be the same as the rotation direction of the fifth path around the stator ring semi-finished product 30 .

[0083] When the grinding wheel 40 is used for rough machining, the self-rotation direction of the grinding wheel 40 is opposite to the rotation direction of the grinding wheel 40 around the center of the stator ring semi-finished product 30, which can help to evenly distribute the grinding force on the workpiece and improve the grinding effect. When the grinding wheel 40 is used for fine machining, the self-rotation direction of the grinding wheel 40 is the same as the rotation direction of the grinding wheel 40 around the center of the stator ring semi-finished product 30, which can reduce the resistance of the grinding wheel 40, improve efficiency and accuracy, and obtain a more accurate inner runway processing surface.

[0084] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A method for machining a stator ring inner raceway, characterized in that: The stator ring inner track processing method comprises: Step S10, based on the completion of the initial positioning of the stator ring semi-finished product and the grinding wheel, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a first path; Wherein, the stator ring semi-finished product is annular; the inner ring of the stator ring semi-finished product is provided with a first dividing point, a first inflection point, a second dividing point, a second inflection point and a target dividing point at intervals of a preset central angle; the first dividing point and the second dividing point are respectively at an equal distance from the center of the stator ring semi-finished product and are a first radius; the first inflection point and the second inflection point are respectively at an equal distance from the center of the stator ring semi-finished product and are a second radius; the first radius is smaller than the second radius; the inner ring radius of the stator ring semi-finished product gradually changes along the circumferential direction; the inner ring trajectory of the stator ring semi-finished product between the first dividing point and the second dividing point is a first trajectory; the first path covers the first trajectory; the starting end of the first path extends to the side of the first dividing point away from the first inflection point; the ending end of the first path extends to the side of the second dividing point away from the first inflection point; Step S20, based on the grinding wheel completing the processing along the first path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the second path; Among them, the inner ring trajectory of the stator ring semi-finished product between the second dividing point and the target dividing point is the second trajectory; the target dividing point coincides with or has a gap with the first dividing point; the second path covers the second trajectory; the starting end of the second path extends to the side of the second dividing point away from the second inflection point; the ending end of the second path extends to the side of the target dividing point away from the second inflection point.

2. A method for machining a stator ring inner raceway according to claim 1, characterized in that: The stator ring inner track processing method also includes: Step S30, based on the grinding wheel completing the processing along the second path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along a third path; Among them, the inner circle of the stator ring semi-finished product is sequentially provided with a third dividing point, a third inflection point, a fourth dividing point and a fourth inflection point at intervals of the preset center angle; the preset center angle is 45°; the third dividing point coincides with the target dividing point; the third dividing point is located between the second inflection point and the third inflection point; the distances from the third dividing point and the fourth dividing point to the center of the stator ring semi-finished product are respectively equal to the first radius; the distances from the third inflection point and the fourth inflection point to the center of the stator ring semi-finished product are respectively equal to the second radius; the inner circle trajectory of the stator ring semi-finished product between the third dividing point and the fourth dividing point is the third trajectory; the third path covers the third trajectory; the starting end of the third path extends to the side of the third dividing point away from the third inflection point; the ending end of the third path extends to the side of the fourth dividing point away from the third inflection point.

3. A method for machining a stator ring inner raceway according to claim 2, characterized in that: The stator ring inner track processing method also includes: Step S40, based on the completion of the processing of the grinding wheel along the third path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the fourth path; the inner ring trajectory of the stator ring semi-finished product between the fourth dividing point and the first dividing point is the fourth trajectory; the fourth path covers the fourth trajectory; the starting end of the fourth path extends to the side of the fourth dividing point away from the fourth inflection point; the ending end of the fourth path extends to the side of the first dividing point away from the fourth inflection point.

4. A method for machining a stator ring inner raceway according to claim 3, characterized in that: The tangents of the inner ring trajectory of the stator ring semi-finished product at the first dividing point and the second dividing point are the first tangent and the second tangent respectively; the moving direction of the grinding wheel at the starting end of the first path gradually becomes perpendicular to the first tangent; the moving direction of the grinding wheel at the ending end of the first path gradually becomes parallel to the second tangent.

5. A method for machining a stator ring inner raceway according to claim 4, characterized in that: The starting end and the ending end of the first path are both arcs; the radius of the arc at the starting end of the first path is smaller than the radius of the arc at the ending end of the first path; the starting end and the ending end of the first path are tangent to the first trajectory respectively.

6. A method for machining a stator ring inner raceway according to claim 5, characterized in that: The starting end and the ending end of the second path are both arcs; the arc radius of the starting end of the second path is smaller than the arc radius of the ending end of the second path; the starting end and the ending end of the second path are tangent to the second trajectory respectively; The arc radius of the starting end of the second path is equal to the arc radius of the terminating end of the first path.

7. A method for machining a stator ring inner raceway according to claim 6, characterized in that: The starting end and the ending end of the third path are both arcs; the arc radius of the starting end of the third path is smaller than the arc radius of the ending end of the third path; the starting end and the ending end of the third path are tangent to the third trajectory respectively; the arc radius of the starting end of the third path is equal to the arc radius of the ending end of the second path.

8. A method for machining a stator ring inner raceway according to claim 7, characterized in that: The starting end and the ending end of the fourth path are both arcs; the arc radius of the starting end of the fourth path is smaller than the arc radius of the ending end of the fourth path; the starting end and the ending end of the fourth path are tangent to the fourth trajectory respectively; The arc radius of the starting end of the fourth path is equal to the arc radius of the terminating end of the third path.

9. The method for machining the inner track of a stator ring according to claim 3, characterized in that: The stator ring inner track processing method also includes: Step S50, based on the completion of the processing of the grinding wheel along the fourth path, controlling the grinding wheel to grind the inner circumferential wall of the stator ring semi-finished product along the fifth path; the fifth path covers the first trajectory, the second trajectory, the third trajectory and the fourth trajectory; the rotation direction of the fifth path around the center of the stator ring semi-finished product is opposite to the rotation direction of the first path around the center of the stator ring semi-finished product.

10. A method for machining a stator ring inner raceway according to claim 9, characterized in that: In the step S10, the rotation direction of the grinding wheel is opposite to the rotation direction of the first path around the stator ring semi-finished product; In the step S20, the rotation direction of the grinding wheel is opposite to the rotation direction of the second path around the stator ring semi-finished product; In the step S30, the rotation direction of the grinding wheel is opposite to the rotation direction of the third path around the stator ring semi-finished product; In the step S40, the rotation direction of the grinding wheel is opposite to the rotation direction of the fourth path around the stator ring semi-finished product; In the step S50, the rotation direction of the grinding wheel is the same as the rotation direction of the fifth path around the stator ring semi-finished product.

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