An electrolytic machining method for the inner raceway of a workpiece

Abstract

The present invention relates to the field of precision electrochemical machining technology, and provides an electrochemical machining method for the inner raceway of a workpiece. By assembling the workpiece on a mounting seat, using a liquid sealing cover to seal the workpiece, sealing the flowing electrolyte within the liquid sealing cover and submerging the workpiece, a stepped spiral electrode is prepared. The stepped spiral electrode includes N segments of stepped spiral threads. Then, by assembling the stepped spiral electrode onto the spindle of an electrochemical machine tool, in the order from the smallest to the largest thread height, controlling the spindle of the electrochemical machine tool to drive the stepped spiral threads with different thread heights among the N segments of stepped spiral threads to be successively positioned at the machining positions inside the workpiece, and performing staged radial electrochemical machining on the workpiece, an inner raceway is machined in a staged manner from shallow to deep in the radial direction of the inner wall of the workpiece, thereby improving the machining accuracy and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of precision electrochemical machining, and particularly to an electrochemical machining method, an electrochemical device, and an electrochemical machine tool for an inner raceway of a workpiece. Background Art

[0002] In the electrochemical machining process, the electrochemical forming process is a high-precision and non-thermal electrochemical machining method, which is suitable for manufacturing workpieces with complex shapes. Generally, the electrochemical forming uses electrodes with special shapes, and these electrodes are often designed according to the required workpiece shape and structure. Since the electrochemical forming uses electrodes with special shapes, very high machining precision can be achieved, and subsequent machining steps are not required or reduced, which is beneficial to reducing the number of machining times and costs of the workpiece. At the same time, since the electrochemical forming is a non-thermal machining method, it will not cause heating or thermal stress of the workpiece, which is beneficial to maintaining the material properties and dimensional stability of the workpiece. In addition, the electrochemical forming can be used to machine various materials, including metal materials with higher hardness, such as stainless steel, nickel-based alloys, and titanium alloys. In the prior art, a conical spiral electrode is used in the electrolysis process to machine the required shape of the workpiece. The conical spiral electrode can usually only machine workpiece shapes with relatively low precision requirements, and the efficiency is relatively low. For the requirement of machining an inner raceway with high precision requirements inside the workpiece, the conical spiral electrode cannot meet the need.

[0003] In summary, the existing electrochemical machining technology has technical problems such as low machining precision and low efficiency. Summary of the Invention

[0004] The purpose of the present invention is to solve at least to some extent the deficiencies in the prior art, and to provide an electrochemical machining method for an inner raceway of a workpiece to improve the machining precision and efficiency.

[0005] The electrochemical machining method for an inner raceway of a workpiece provided by the present invention includes:

[0006] Assemble the workpiece on the mounting seat, seal the workpiece with a sealing liquid cover, seal the flowing electrolyte inside the sealing liquid cover, and submerge the workpiece. Seal the flowing electrolyte inside the sealing liquid cover and submerge the workpiece;

[0007] Prepare a stepped spiral electrode, where the stepped spiral electrode includes N stepped spiral threads; among the N stepped spiral threads, the thread height of the Kth stepped spiral thread is less than the thread height of the (K + 1)th stepped spiral thread; K is a natural number greater than or equal to 1.

[0008] Assemble the stepped spiral electrode onto the main shaft of the electrolytic machine tool. According to the order of the thread heights from the smallest to the largest, control the main shaft of the electrolytic machine tool to drive the stepped spiral threads with different thread heights among the N-section stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece, so as to generate an internal raceway on the inner wall of the workpiece.

[0009] Further, when N is equal to 3, control the main shaft of the electrolytic machine tool to drive the stepped spiral threads with the lowest, the second lowest, and the third lowest thread heights among the 3-section stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece, so as to generate an internal raceway on the inner wall of the workpiece.

[0010] Further, controlling the main shaft of the electrolytic machine tool to drive the stepped spiral threads with the lowest, the second lowest, and the third lowest thread heights among the 3-section stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece, so as to generate an internal raceway on the inner wall of the workpiece, includes:

[0011] Control the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the lowest thread height among the 3-section stepped spiral threads to move to the inner wall inside the workpiece, and electrolytically machine a first-depth groove at the machining position on the inner wall inside the workpiece;

[0012] Control the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the second lowest thread height among the 3-section stepped spiral threads to gradually spiral to the first-depth groove, and electrolytically machine a second-depth groove at the radial machining position of the first-depth groove;

[0013] Control the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the third lowest thread height among the 3-section stepped spiral threads to gradually spiral to the second-lowest-depth groove, and electrolytically machine a third-depth groove at the radial machining position of the second-lowest-depth groove.

[0014] Further, when the workpiece is located below the stepped spiral electrode before starting the machining, controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the lowest thread height among the 3-section stepped spiral threads to move to the inner wall inside the workpiece, includes: controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the lowest thread height among the 3-section stepped spiral threads to move downward to the inner wall inside the workpiece.

[0015] Further, when the stepped spiral electrode is located inside the workpiece, controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the second lowest thread height among the 3-section stepped spiral threads to gradually spiral to the first-depth groove, includes: controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the second lowest thread height among the 3-section stepped spiral threads to gradually spiral downward to the first-depth groove.

[0016] Further, when the stepped spiral electrode is located inside the workpiece, controlling the spindle of the electrolytic machine tool to drive the stepped spiral thread with the third lowest thread height among the three stepped spiral threads to gradually spiral into the groove with the second lowest depth, includes: controlling the spindle of the electrolytic machine tool to drive the stepped spiral thread with the third lowest thread height among the three stepped spiral threads to spiral downward gradually into the second depth groove.

[0017] Further, sealing the flowing electrolyte in a liquid sealing cover and submerging the workpiece, includes:

[0018] Connecting the electrolyte transmission system to the liquid inlet of the mounting seat, and the liquid inlet communicates with the liquid sealing cover;

[0019] Controlling the electrolyte transmission system to transmit the flowing electrolyte to the liquid inlet, sealing the flowing electrolyte in the liquid sealing cover, and submerging the workpiece.

[0020] Further, the workpiece is an annular body, and the annular body includes an inner ring and an outer ring; the inner ring is the inner side of the workpiece.

[0021] Further, the inner raceway is a thread groove.

[0022] Further, the stepped spiral electrode includes a spiral cathode body and stepped spiral threads, and the stepped spiral threads are formed on the outer wall of the spiral cathode body and are electrically connected to the inside of the spiral cathode body; the stepped spiral threads include the N stepped spiral threads.

[0023] Further, the spiral cathode body includes a shaft connection part and a spiral thread setting part, the shaft connection part is used to connect the spindle of the electrolytic machine tool, and the spiral thread setting part is used to set and form the stepped spiral threads.

[0024] Further, the shaft connection part and the spiral thread setting part are integrally connected, the shaft connection part is a cylinder, and the spiral thread setting part is a cylinder; the diameter of the shaft connection part is smaller than the diameter of the spiral thread setting part.

[0025] 5. Further, among the N stepped spiral threads, the pitches of different stepped spiral threads are equal, the thread lengths are equal, and they are located on the same spiral line.

[0026] Further, among the N stepped spiral threads, the thread heights of different stepped spiral threads are different; with the direction close to the spindle of the electrolytic machine tool as a reference, the closer to the spindle of the electrolytic machine tool, the higher the thread height;

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] The electrolytic machining method for the inner raceway of a workpiece proposed by the present invention involves assembling the workpiece on a mounting base, using a liquid sealing cover to seal the workpiece, sealing the flowing electrolyte within the liquid sealing cover, and submerging the workpiece. A stepped spiral electrode is prepared. The stepped spiral electrode includes N sections of stepped spiral threads. Among the N sections of stepped spiral threads, the thread height of the K-th section of stepped spiral threads is less than that of the (K + 1)-th section of stepped spiral threads, where K is a natural number greater than or equal to 1. Then, the stepped spiral electrode is assembled onto the spindle of an electrolytic machine tool. According to the order of increasing thread height, the spindle of the electrolytic machine tool is controlled to drive the stepped spiral threads with different thread heights among the N sections of stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece, so as to generate an inner raceway on the inner wall of the workpiece. Thus, the stepped spiral threads spirally move to the machining positions inside the workpiece, and the workpiece is subjected to staged radial electrolytic machining. The inner raceway is machined in stages from shallow to deep in the radial direction of the inner wall of the workpiece, improving the machining accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is a flow schematic diagram of the electrolytic machining method for the inner raceway of a workpiece in an embodiment of the present invention;

[0031] Figure 2 is a structural schematic diagram of a stepped spiral electrode in an embodiment of the present invention;

[0032] Figure 3 is another structural schematic diagram of a stepped spiral electrode in an embodiment of the present invention;

[0033] Figure 4 is another structural schematic diagram of a stepped spiral electrode in an embodiment of the present invention;

[0034] Figure 5 is another structural schematic diagram of a stepped spiral electrode in an embodiment of the present invention;

[0035] Figure 6 is a structural schematic diagram of a workpiece in an embodiment of the present invention;

[0036] Figure 7 is a structural schematic diagram of an electrolytic device in an embodiment of the present invention;

[0037] Figure 8 It is another structural schematic diagram of the electrolysis device according to the embodiment of the present invention; Figure 9 It is a schematic diagram of the architecture of the electrolysis machine tool according to the embodiment of the present invention.

[0038] In the drawings, each reference numeral represents:

[0039] 1. Spiral cathode body; 10. Shaft connection part; 11. Spiral thread setting part;

[0040] 2. Step-shaped spiral thread; 20. First-stage step-shaped spiral thread; 21. Second-stage step-shaped spiral thread; 22. Third-stage step-shaped spiral thread; 23. Step spacing; 24. Pitch;

[0041] 3. Workpiece; 30. Inner raceway; 31. Inner ring; 32. Outer ring;

[0042] 4. Spindle of the electrolysis machine tool;

[0043] 5. Mounting seat;

[0044] 6. Liquid sealing cover. Specific embodiments

[0045] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar methods or methods with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] Embodiment 1

[0047] Referring to Figures 1-9 , this embodiment provides an electrolytic machining method for the inner raceway of a workpiece, including the following steps:

[0048] S101. Assemble the workpiece on the mounting seat, use the liquid sealing cover to seal the workpiece, seal the flowing electrolyte in the liquid sealing cover, and submerge the workpiece. Seal the flowing electrolyte in the liquid sealing cover and submerge the workpiece;

[0049] S102. Prepare a stepped spiral electrode, and the stepped spiral electrode includes N sections of step-shaped spiral threads; among the N sections of step-shaped spiral threads, the thread height of the Kth section of step-shaped spiral thread is less than the thread height of the (K + 1)th section of step-shaped spiral thread; K is a natural number greater than or equal to 1;

[0050] S103. Assemble the stepped spiral electrode onto the main shaft of the electrolytic machine tool; control the main shaft of the electrolytic machine tool to drive the stepped spiral threads with different thread heights among the N stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece in the order from the smallest to the largest thread height, so as to generate an inner raceway on the inner wall of the workpiece.

[0051] It should be noted that after assembling the stepped spiral electrode onto the main shaft of the electrolytic machine tool, it may include: controlling the main shaft of the electrolytic machine tool to drive the stepped spiral electrode to move so that the central axis of the stepped spiral electrode is coaxial with the central axis inside the workpiece. For example, when the workpiece is annular, the central axis of the stepped spiral electrode is coaxial with the cylindrical axis of the annular workpiece.

[0052] It should be noted that in this embodiment, by assembling the workpiece 3 onto the mounting seat 5, using the liquid sealing cover 6 to seal the workpiece, sealing the flowing electrolyte inside the liquid sealing cover 6, and submerging the workpiece, a stepped spiral electrode is prepared. The stepped spiral electrode includes N stepped spiral threads. Among the N stepped spiral threads, the thread height of the Kth stepped spiral thread is less than the thread height of the (K + 1)th stepped spiral thread, where K is a natural number greater than or equal to 1. Then, by assembling the stepped spiral electrode onto the main shaft 4 of the electrolytic machine tool, controlling the main shaft of the electrolytic machine tool to drive the stepped spiral threads with different thread heights among the N stepped spiral threads to successively perform radial electrolytic machining at the machining positions inside the workpiece in the order from the smallest to the largest thread height, so as to generate an inner raceway on the inner wall of the workpiece, so that the stepped spiral threads spirally move to the machining positions inside the workpiece, perform staged radial electrolytic machining on the workpiece, and generate the inner raceway in a staged manner from shallow to deep in the radial direction of the inner wall of the workpiece, thereby improving the machining accuracy and efficiency.

[0053] It should be noted that in this embodiment, N can be any natural number greater than 2. When N is equal to 3, the main shaft of the electrolytic machine tool is controlled to drive the stepped helical threads with the lowest, the second lowest, and the third lowest thread heights among the three sections of stepped helical threads to perform radial electrolytic machining at the machining positions inside the workpiece in sequence, so as to generate an inner raceway on the inner wall of the workpiece. Preferably, controlling the main shaft of the electrolytic machine tool to drive the stepped helical threads with the lowest, the second lowest, and the third lowest thread heights among the three sections of stepped helical threads to perform radial electrolytic machining at the machining positions inside the workpiece in sequence, so as to generate an inner raceway on the inner wall of the workpiece, may include: controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the lowest thread height among the three sections of stepped helical threads to move to the inner wall of the inner side of the workpiece, and electrolytically machining a first-depth groove at the machining position on the inner wall of the inner side of the workpiece; controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the second lowest thread height among the three sections of stepped helical threads to helically progress to the first-depth groove, and electrolytically machining a second-depth groove at the radial machining position of the first-depth groove; controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three stepped helical threads to helically progress to the second-lowest-depth groove, and electrolytically machining a third-depth groove at the radial machining position of the second-lowest-depth groove.

[0054] Preferably, when the workpiece is located below the stepped helical electrode before starting machining, controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the lowest thread height among the three sections of stepped helical threads to move to the inner wall of the inner side of the workpiece includes: controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the lowest thread height among the three sections of stepped helical threads to move downward to the inner wall of the inner side of the workpiece.

[0055] Preferably, when the stepped helical electrode is located inside the workpiece, controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the second lowest thread height among the three sections of stepped helical threads to helically progress to the first-depth groove includes: controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the second lowest thread height among the three sections of stepped helical threads to helically progress downward to the first-depth groove.

[0056] Preferably, when the stepped helical electrode is located inside the workpiece, controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three stepped helical threads to helically progress to the second-lowest-depth groove includes: controlling the main shaft of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three sections of stepped helical threads to helically progress downward to the second-depth groove.

[0057] It should be noted that sealing the flowing electrolyte in the liquid sealing cover and submerging the workpiece may include: connecting the electrolyte transmission system to the liquid inlet of the mounting seat, where the liquid inlet communicates with the liquid sealing cover; controlling the electrolyte transmission system to transmit the flowing electrolyte to the liquid inlet, sealing the flowing electrolyte in the liquid sealing cover, and submerging the workpiece.

[0058] Embodiment 2

[0059] Please refer to Figures 1-9 , the prepared stepped spiral electrode includes:

[0060] The spiral cathode body 1, and the inside of the spiral cathode body 1 is used for conducting current;

[0061] The stepped spiral thread 2 is formed on the outer wall of the spiral cathode body 1 and is electrically connected to the inside of the spiral cathode body 1; before the electrolytic machining of the inner raceway 30 on the inner side of the workpiece, the stepped spiral thread 2 spirally moves to the machining position on the inner side of the workpiece to perform staged radial electrolytic machining on the workpiece 3, so as to generate the inner raceway 30 on the inner wall of the workpiece 3.

[0062] It should be noted that the inner raceway 30 refers to a circular structure groove machined on the inner side of the workpiece. For example, the inner raceway 30 can be a thread groove. Wherein, the workpiece 3 can be a ring-shaped body, and the ring-shaped body includes an inner ring 31 and an outer ring 32; the inner ring 31 is the inner side of the workpiece. The inner raceway 30 is generated on the side wall of the inner ring 31 of the ring-shaped workpiece 3 through electrolytic machining.

[0063] It should be noted that in the prior art, there is a technology of using a conical spiral electrode to machine the required shape of the workpiece 3, but the conical spiral electrode can usually only machine the shape of the workpiece 3 with relatively low precision requirements, and the efficiency is relatively low. For the requirement of machining a high-precision inner raceway 30 inside the workpiece 3, the conical spiral electrode cannot be satisfied. In this embodiment, by arranging the stepped spiral thread 2 on the outer wall of the spiral cathode body 1, before the electrolytic machining of the inner raceway 30 on the inner side of the workpiece, the stepped spiral thread 2 spirally moves to the machining position on the inner side of the workpiece to perform staged radial electrolytic machining on the workpiece 3, so as to generate the inner raceway 30 on the inner wall of the workpiece 3, realizing high-precision and high-efficiency electrolytic machining.

[0064] It should be noted that the staged radial electrochemical machining of the workpiece 3 refers to the segmented characteristics of the stepped spiral groove 2. First, the machining position on the inner side of the workpiece is machined with the K-th stepped spiral groove 2, and then the machining position on the inner side of the workpiece is machined with the (K + 1)-th stepped spiral groove 2. The K-th stepped spiral groove 2 is adjacent to the (K + 1)-th stepped spiral groove 2. For example, first, the machining position on the inner side of the workpiece is machined with the first stepped spiral groove 20, then the machining position on the inner side of the workpiece is machined with the second stepped spiral groove 21, then the machining position on the inner side of the workpiece is machined with the third stepped spiral groove 22, and then the machining position on the inner side of the workpiece is machined with the K-th stepped spiral groove 2, and so on, until the inner raceway 30 is formed on the inner wall of the workpiece 3. Among them, the first stepped spiral groove 20 is adjacent to the second stepped spiral groove 21, the third stepped spiral groove 22 is adjacent to the second stepped spiral groove 21, and the K-th stepped spiral groove 2 is adjacent to the (K + 1)-th stepped spiral groove 2.

[0065] It should be noted that the machining position on the inner side of the workpiece changes along the radial direction of the inner side of the workpiece. For example, before electrochemical machining, the machining position on the inner side of the workpiece is the inner wall of the workpiece, and the bottom of the groove formed after machining the inner wall of the workpiece with the first stepped spiral groove 20 is the new machining position on the inner side of the workpiece.

[0066] In some preferred embodiments, the spiral cathode body 1 includes a shaft connection portion 10 and a spiral groove setting portion 11. The shaft connection portion 10 is used to connect the main shaft 4 of the electrochemical machine tool, and the spiral groove setting portion 11 is used to set and form the stepped spiral groove 2. Further, the shaft connection portion 10 and the spiral groove setting portion 11 are integrally connected. The shaft connection portion 10 is a cylinder, and the spiral groove setting portion 11 is a cylinder; the diameter of the shaft connection portion 10 is smaller than the diameter of the spiral groove setting portion 11.

[0067] In some preferred embodiments, among the N stepped spiral grooves, the pitches of different stepped spiral grooves are equal, the lengths of the thread lines are equal, and they are located on the same spiral line.

[0068] In some preferred embodiments, among the N stepped spiral grooves, the thread heights of different stepped spiral grooves are different; with the direction close to the main shaft 4 of the electrochemical machine tool as a reference, the closer to the main shaft 4 of the electrochemical machine tool, the higher the thread height.

[0069] It should be noted that in this embodiment, through the height sequence of the spiral threads and using the height difference of the spiral threads, electrolytic machining is carried out in stages from the radial direction of the machining position of the workpiece 3, so that the inner raceway 30 with the required depth can be machined efficiently and precisely. At the same time, since the stepped spiral threads 2 with different thread heights all spiral into the machining position of the previous state. For example, the stepped spiral thread 2 with the lowest first thread height spirally moves to the machining position inside the workpiece, and electrolytically generates a thread groove with a first depth along the radial direction of the machining position on the inner surface of the workpiece. The stepped spiral thread 2 with the second lowest thread height spirally moves to the first-depth thread groove and electrolytically generates a second-depth thread groove along the radial direction of the first-depth thread groove. The stepped spiral thread 2 with the third lowest thread height spirally moves to the second-depth thread groove, thus avoiding mechanical collision between the stepped spiral threads 2 with different thread heights and the machining position inside the workpiece and damaging the electrode and the workpiece 3.

[0070] In some further preferred embodiments, among the N-section stepped spiral threads, the thread lengths of the stepped spiral threads in different sections are the same, the number of turns wound around the spiral cathode body 1 is the same, and the pitch 24 is the same. It should be noted that in this embodiment, since the thread lengths of the stepped spiral threads in different sections among the N-section stepped spiral threads are the same, the number of turns wound around the spiral cathode body 1 is the same, and the pitch 24 is the same, the spiral movement of the N-section stepped spiral threads to the machining position inside the workpiece can be uniformly controlled to perform staged radial electrolytic machining on the workpiece 3, achieving refined and quantified electrolytic machining, generating the inner raceway 30 on the inner wall of the workpiece 3, and improving the accuracy and efficiency of electrolytic machining.

[0071] Embodiment Three

[0072] Please refer to Figures 1-9 , the stepped spiral electrode as described in any of the above embodiments can be assembled into an electrolytic device, and the electrolytic device includes:

[0073] The stepped spiral electrode as described in any of the above embodiments;

[0074] The main shaft 4 of the electrolytic machine tool, which is connected to the stepped spiral electrode and is used to control the spiral movement of the stepped spiral electrode to the machining position inside the workpiece;

[0075] The sealed mounting seat 5, which is used to mount the workpiece 3 and the liquid sealing cover 6; the liquid sealing cover 6 seals the workpiece 3 and the stepped spiral electrode in the electrolyte.

[0076] It should be noted that the inner raceway 30 refers to a ring-shaped groove structure machined on the inner side of the workpiece. For example, the inner raceway 30 can be a thread groove. Among them, the workpiece 3 can be a ring-shaped body, and the ring-shaped body includes an inner ring 31 and an outer ring 32; the inner ring 31 is the inner side of the workpiece. The inner raceway 30 is generated on the side wall of the inner ring 31 of the ring-shaped workpiece 3 through electrolytic machining.

[0077] It should be noted that in the prior art, there is a technology of using a conical spiral electrode to machine the required shape of the workpiece 3. However, the conical spiral electrode can usually only machine the shape of the workpiece 3 with relatively low precision requirements, and the efficiency is relatively low. For the requirement of machining a high-precision inner raceway 30 inside the workpiece 3, the conical spiral electrode cannot meet the need. In this embodiment, by providing a stepped spiral thread 2 on the outer wall of the spiral cathode body 1, before the electrolytic machining of the inner raceway 30 on the inner side of the workpiece, the stepped spiral thread 2 spirally moves to the machining position on the inner side of the workpiece to perform staged radial electrolytic machining on the workpiece 3, so as to generate the inner raceway 30 on the inner wall of the workpiece 3, realizing high-precision and high-efficiency electrolytic machining.

[0078] It should be noted that the staged radial electrolytic machining of the workpiece 3 refers to the segmented characteristic of the stepped spiral thread 2. First, the K-th stepped spiral thread 2 is used to machine the machining position on the inner side of the workpiece, and then the (K + 1)-th stepped spiral thread 2 is used to machine the machining position on the inner side of the workpiece. K is a natural number greater than or equal to 2. The K-th stepped spiral thread 2 is adjacent to the (K + 1)-th stepped spiral thread 2. For example, first, the first stepped spiral thread 20 is used to machine the machining position on the inner side of the workpiece, then the second stepped spiral thread 21 is used to machine the machining position on the inner side of the workpiece, then the third stepped spiral thread 22 is used to machine the machining position on the inner side of the workpiece, and then the K-th stepped spiral thread 2 is used to machine the machining position on the inner side of the workpiece, and so on, until the inner raceway 30 is generated on the inner wall of the workpiece 3. Among them, the first stepped spiral thread 20 is adjacent to the second stepped spiral thread 21, the third stepped spiral thread 22 is adjacent to the second stepped spiral thread 21, and the K-th stepped spiral thread 2 is adjacent to the (K + 1)-th stepped spiral thread 2.

[0079] It should be noted that the machining position on the inner side of the workpiece changes along the radial direction of the inner side of the workpiece. For example, before electrolytic machining, the machining position on the inner side of the workpiece is the inner wall of the inner side of the workpiece, and the bottom of the groove formed after machining the inner wall of the inner side of the workpiece with the first stepped spiral thread 20 is the new machining position on the inner side of the workpiece.

[0080] It should be noted that the sealed mounting base 5 may include a liquid inlet and a liquid outlet, which are respectively arranged on both sides of the bottom of the sealed mounting base 5. The liquid inlet is connected to the electrolyte transmission system, and the electrolyte transmission system conveys the electrolyte from the liquid inlet to the liquid sealing cover 6.

[0081] Embodiment 4

[0082] Please refer to Figures 1-9 , the above electrolysis device can be applied to an electrolysis machine tool. The electrolysis machine tool includes the electrolysis device described in the above embodiment. Therefore, it has the characteristics of the stepped spiral electrode described in any of the above embodiments and can be used to process a workpiece to generate an inner raceway.

[0083] It should be noted that the inner raceway 30 refers to a circular structure groove machined on the inner side of the workpiece. For example, the inner raceway 30 can be a thread groove. Wherein, the workpiece 3 can be a circular ring-shaped body, and the circular ring-shaped body includes an inner ring 31 and an outer ring 32; the inner ring 31 is the inner side of the workpiece. The inner raceway 30 is generated on the side wall of the inner ring 31 of the circular ring-shaped workpiece 3 through electrolytic machining.

[0084] It should be noted that in the prior art, there is a technology of using a conical spiral electrode to machine the required shape of the workpiece 3. However, the conical spiral electrode can usually only machine the shape of the workpiece 3 with relatively low precision requirements, and the efficiency is relatively low. For the need to machine a high-precision inner raceway 30 inside the workpiece 3, the conical spiral electrode cannot meet the requirements. In this embodiment, by arranging stepped spiral threads 2 on the outer wall of the spiral cathode body 1, before the electrolytic machining of the inner raceway 30 on the inner side of the workpiece, the stepped spiral threads 2 spirally move to the machining position on the inner side of the workpiece to perform staged radial electrolytic machining on the workpiece 3, so as to generate the inner raceway 30 on the inner wall of the workpiece 3, realizing high-precision and high-efficiency electrolytic machining.

[0085] It should be noted that the staged radial electrochemical machining of the workpiece 3 refers to the segmented characteristics of the stepped spiral groove 2. First, the machining position on the inner side of the workpiece is machined with the K-th stepped spiral groove 2, and then the machining position on the inner side of the workpiece is machined with the (K + 1)-th stepped spiral groove 2, where K is a natural number greater than or equal to 2. The K-th stepped spiral groove 2 is adjacent to the (K + 1)-th stepped spiral groove 2. For example, first, the machining position on the inner side of the workpiece is machined with the first stepped spiral groove 20, then the machining position on the inner side of the workpiece is machined with the second stepped spiral groove 21, then the machining position on the inner side of the workpiece is machined with the third stepped spiral groove 22, and then the machining position on the inner side of the workpiece is machined with the K-th stepped spiral groove 2, and so on, until the inner raceway 30 is formed on the inner wall of the workpiece 3. Among them, the first stepped spiral groove 20 is adjacent to the second stepped spiral groove 21, the third stepped spiral groove 22 is adjacent to the second stepped spiral groove 21, and the K-th stepped spiral groove 2 is adjacent to the (K + 1)-th stepped spiral groove 2.

[0086] It should be noted that the machining position on the inner side of the workpiece changes along the radial direction of the inner side of the workpiece. For example, before electrochemical machining, the machining position on the inner side of the workpiece is the inner wall of the workpiece, and the bottom of the groove formed after machining the inner wall of the workpiece with the first stepped spiral groove 20 is the new machining position on the inner side of the workpiece.

[0087] The above is the description of the technical solution provided by the present invention. For those skilled in the art, according to the idea of the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An electrolytic machining method for the inner raceway of a workpiece, characterized in that Including: Assemble the workpiece on the mounting base, seal the workpiece using a liquid sealing cover, seal the flowing electrolyte within the liquid sealing cover, and submerge the workpiece in the sealed flowing electrolyte within the liquid sealing cover; Prepare a stepped spiral electrode, where the prepared stepped spiral electrode includes: a spiral cathode body and stepped spiral threads; the interior of the spiral cathode body is used for conducting current; the stepped spiral threads are formed on the outer wall of the spiral cathode body and are electrically connected to the interior of the spiral cathode body; before the electrolytic machining of the inner raceway on the inner side of the workpiece, the stepped spiral threads spirally move to the machining position on the inner side of the workpiece; the spiral cathode body includes a shaft connection part and a spiral thread setting part, the shaft connection part is used for connecting the main shaft of the electrolytic machine tool, and the spiral thread setting part is used for setting and forming the stepped spiral threads; the shaft connection part and the spiral thread setting part are integrally connected, the shaft connection part is a cylinder, and the spiral thread setting part is a cylinder; the diameter of the shaft connection part is smaller than the diameter of the spiral thread setting part; The stepped spiral electrode includes N segments of stepped spiral threads; among the N segments of stepped spiral threads, the thread height of the K-th segment of stepped spiral threads is smaller than the thread height of the (K + 1)-th segment of stepped spiral threads; K is a natural number greater than or equal to 1; among the N segments of stepped spiral threads, the pitches of different segments of stepped spiral threads are equal, the lengths of the thread lines are equal, and they are located on the same spiral line; among the N segments of stepped spiral threads, the thread heights of different segments of stepped spiral threads are different; with the direction closer to the main shaft of the electrolytic machine tool as a reference, the closer to the main shaft of the electrolytic machine tool, the higher the thread height; Assemble the stepped spiral electrode onto the main shaft of the electrolytic machine tool, and according to the order of increasing thread height, control the main shaft of the electrolytic machine tool to drive the stepped spiral threads with different thread heights among the N segments of stepped spiral threads to successively perform radial electrolytic machining at the machining position on the inner side of the workpiece, so as to generate an inner raceway on the inner wall of the workpiece; the inner raceway refers to a circular structure groove machined on the inner side of the workpiece.

2. The electrochemical machining method for the inner raceway of the workpiece according to claim 1, characterized in that Including: When N is equal to 3, control the main shaft of the electrolytic machine tool to drive the stepped spiral threads with the lowest, second lowest, and third lowest thread heights among the 3 segments of stepped spiral threads to successively perform radial electrolytic machining at the machining position on the inner side of the workpiece, so as to generate an inner raceway on the inner wall of the workpiece.

3. The electrolytic machining method for the inner raceway of the workpiece according to claim 2, characterized in that, Controlling the main shaft of the electrolytic machine tool to drive the stepped spiral threads with the lowest, second lowest, and third lowest thread heights among the 3 segments of stepped spiral threads to successively perform radial electrolytic machining at the machining position on the inner side of the workpiece, so as to generate an inner raceway on the inner wall of the workpiece, includes: Controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the lowest thread height among the 3 segments of stepped spiral threads to move to the inner wall of the inner side of the workpiece, and electrolytically machine the first depth groove at the machining position on the inner wall of the inner side of the workpiece; Controlling the main shaft of the electrolytic machine tool to drive the stepped spiral thread with the second lowest thread height among the 3 segments of stepped spiral threads to spirally approach the first depth groove, and electrolytically machine the second depth groove at the radial machining position of the first depth groove; Control the spindle of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three stepped helical threads to helically progress to the groove with the second lowest depth, and electrolytically machine the third depth groove at the radial machining position of the groove with the second lowest depth.

4. The electrolytic machining method for the inner raceway of the workpiece according to claim 3, characterized in that, When the workpiece is located below the stepped helical electrode before starting the machining, control the spindle of the electrolytic machine tool to drive the stepped helical thread with the lowest thread height among the three stepped helical threads to move to the inner wall of the workpiece, including: controlling the spindle of the electrolytic machine tool to drive the stepped helical thread with the lowest thread height among the three stepped helical threads to move downward to the inner wall of the workpiece.

5. The electrolytic machining method for the inner raceway of the workpiece according to claim 3, characterized in that, When the stepped helical electrode is located inside the workpiece, control the spindle of the electrolytic machine tool to drive the stepped helical thread with the second lowest thread height among the three stepped helical threads to helically progress to the first depth groove, including: controlling the spindle of the electrolytic machine tool to drive the stepped helical thread with the second lowest thread height among the three stepped helical threads to helically progress downward to the first depth groove.

6. The electrolytic machining method for the inner raceway of the workpiece according to claim 3, characterized in that, When the stepped helical electrode is located inside the workpiece, control the spindle of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three stepped helical threads to helically progress to the groove with the second lowest depth, including: controlling the spindle of the electrolytic machine tool to drive the stepped helical thread with the third lowest thread height among the three stepped helical threads to helically progress downward to the second depth groove.

7. The electrochemical machining method for the inner raceway of the workpiece according to any one of claims 1-6, characterized in that, Seal the flowing electrolyte in the liquid sealing cover and immerse the workpiece, including: Connect the electrolyte transmission system to the liquid inlet of the mounting seat, and the liquid inlet communicates with the liquid sealing cover; Control the electrolyte transmission system to transmit the flowing electrolyte to the liquid inlet, seal the flowing electrolyte in the liquid sealing cover, and immerse the workpiece.

8. The electrochemical machining method for the inner raceway of the workpiece according to any one of claims 1-6, characterized in that, The workpiece is a ring-shaped body, and the ring-shaped body includes an inner ring and an outer ring; the inner ring is the inner side of the workpiece.

9. The electrochemical machining method for the inner raceway of the workpiece according to any one of claims 1-6, characterized in that The inner raceway is a thread groove.

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