Stress removing equipment for milling cutter and stress removing method of stress removing equipment

Abstract

The invention discloses destressing equipment for a milling cutter and a destressing method of the destressing equipment, and belongs to the technical field of milling cutter machining. The destressing equipment comprises a positioning tool and a vibration module, and the positioning tool comprises a positioning part; the vibration module comprises a vibration part, and the vibration part is located above the positioning part; the positioning part can rotate along a fixed axis in the horizontal direction, and the vibration part generates vibration in the vertical direction; the vibration part can also move in the horizontal direction in the direction parallel to the axial direction of the positioning part. The destressing method comprises the following steps that S1, the milling cutter is fixed to the positioning part, and the cutting edge of the milling cutter abuts against the lower portion of the vibration part; s2, a vibration module, a magnetic force module and an ultrasonic pulse module are started, and the milling cutter is subjected to destressing operation through a vibration part, magnetic force and ultrasonic pulses; s3, the index plate is started, and the milling cutter is made to rotate in a fixed-axis mode; meanwhile, the vibration module is driven to axially move along the milling cutter; and S4, after the destressing operation is completed, the milling cutter is taken down.

Description

Technical Field

[0001] The invention relates to a milling cutter stress relief technology, and more specifically, to a milling cutter stress relief device and a stress relief method thereof. Background Art

[0002] At present, for milling cutters, especially high-precision milling cutters, it is necessary to perform a stress relief process on the milling cutter before coating to remove the processing stress remaining in the milling cutter at the internal processing edge, so as to improve the precision and life of the milling cutter. Common stress relief methods are thermal stress relief, aging stress relief and vibration stress relief. Thermal stress relief takes a long time, and the entire temperature curve requires several days, and aging stress relief takes even longer. Vibration stress relief is more commonly used on large steel parts. For small products such as milling cutters, previous equipment is not applicable, and the stress is mostly concentrated at the cutting edge, so the single method of pressing and fixing through vibration stress relief is not effective.

[0003] For example: Chinese patent announcement number CN110509016B, announcement date December 11, 2020, the invention name is a manufacturing process for an ultra-fine cemented carbide milling cutter, and the application discloses a stress relief method for a milling cutter, and a low-temperature stress relief aging treatment process is arranged between the rough grinding step and the fine grinding step. The low-temperature stress relief aging treatment is to place the milling cutter in a low-temperature aging oil furnace, and perform aging treatment at a set heating temperature and insulation time. This scheme realizes high-precision, high-efficiency and high-durability milling of worms with small-modulus milling cutters. However, this scheme adopts a thermal stress relief method, which not only has a longer stress relief time, but is also only suitable for stress relief after the rough grinding step and before the fine grinding step, and cannot relieve stress on products after fine processing. Summary of the invention

[0004] The present invention overcomes the problems of long stress relief time and poor stress relief effect of the milling cutter, and provides a stress relief device and a stress relief method for the milling cutter. This scheme can eliminate the stress of the milling cutter after fine machining is completed, and at the same time can reduce the stress relief time and improve the precision and life of the milling cutter cutting edge.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: a stress relief device for a milling cutter, comprising a positioning tool and a vibration module, the positioning tool comprising a positioning part; the vibration module comprising a vibration part, the vibration part being located above the positioning part; the positioning part being able to rotate along a fixed axis in the horizontal direction, and the vibration part generating vibrations in the vertical direction; the vibration part being able to move in the horizontal direction parallel to the axial direction of the positioning part. In this scheme, the positioning part can clamp and position the milling cutter, and the vibration part can perform vibration stress relief on the cutting edge of the milling cutter. The fixed axis rotation of the positioning part can drive the fixed axis rotation of the milling cutter, thereby ensuring that the spiral cutting edge of the milling cutter is subjected to stress relief operation, while the vibration part performs vibration stress relief in the radial direction of the milling cutter in the vertical direction, and performs stress relief operation along the axial movement of the milling cutter at the same time. Finally, the stress relief of the milling cutter is achieved, and the cutting edge of the milling cutter is fully stress-relieved, thereby improving the precision and life of the cutting edge of the milling cutter.

[0006] Preferably, it further comprises a working platform, the positioning fixture is slidably connected to the working platform, the positioning fixture further comprises a dividing plate, and the dividing plate is provided with the positioning part. The working platform is a support platform for the entire device, and the positioning fixture can slide on the working platform. On the one hand, the position of the positioning fixture relative to the vibration module can be adjusted to improve the vibration stress relief effect of the milling cutter, and on the other hand, it is also convenient to assemble the milling cutter on the positioning fixture and facilitate operation.

[0007] Preferably, the vibration module comprises a fixed bracket, a vibration device is provided on the fixed bracket, the vibration device is connected to the fixed bracket by sliding along the axial direction of the positioning part, and the vibration part is provided at the bottom of the vibration device. The vibration device is a vibration generator, and the vibration device slides along the axial direction of the positioning part, that is, the vibration device can move relatively along the axial direction of the milling cutter, so as to achieve full coverage of the milling cutter cutting edge by the vibration device and improve the vibration stress relief effect.

[0008] Preferably, the working platform is further provided with a vertically arranged support plate, and the fixed bracket is rotatably connected to the support plate. The support plate is used to support the vibration device, and can also be used to arrange other mechanisms on the support plate. The fixed bracket is rotatably connected to the support plate, so that the vibration module on the fixed bracket can rotate on a vertical plane, which is conducive to the contact and separation of the milling cutter on the vibration part and the positioning part.

[0009] Preferably, the device further comprises a magnetic module, the position of which is flush with the position of the positioning portion and corresponds to the position of the positioning portion. The magnetic module can perform magnetic stress relief on the milling cutter, further improving the stress relief effect of the milling cutter.

[0010] Preferably, an ultrasonic pulse module is also included, and the ultrasonic pulse module is arranged below the positioning tool. The ultrasonic pulse module can perform ultrasonic pulse stress relief on the milling cutter, further improving the stress relief effect of the milling cutter. Through the high frequency, high efficiency and high energy under focusing of ultrasonic waves, the metal surface can produce a large compressive plastic deformation, while changing the original stress field, generating a certain value of compressive stress, so that the impacted part can be strengthened. This treatment can not only reduce the stress concentration caused by the excess height and eliminate the defects on the surface of the milling cutter, but also produce a large compressive plastic deformation at the milling cutter, thereby adjusting the residual stress field of the milling cutter edge, so that the milling cutter part is strengthened and hardened. In addition, ultrasonic pulse stress relief can also significantly improve the fatigue life and fatigue strength of the milling cutter.

[0011] Preferably, the positioning fixture further comprises a positioning bracket, the positioning bracket is provided with a locking portion, and the locking portion is provided with a rotating seat corresponding to the positioning portion. The locking portion on the positioning bracket can cooperate with the positioning portion of the positioning fixture to completely position the milling cutter to avoid the milling cutter being subjected to force on only one side, and the rotating seat can ensure the rotational movement of the milling cutter to ensure that it can normally complete the circumferential rotation to relieve stress.

[0012] A method for relieving stress of a milling cutter is implemented by using the above-mentioned stress relieving device for a milling cutter, and includes the following steps: S1: fixing the milling cutter on a positioning part, and making the cutting edge of the milling cutter abut against the bottom of a vibration part; S2: starting a vibration module, a magnetic module and an ultrasonic pulse module, and performing a stress relieving operation on the milling cutter by using the vibration part, magnetic force and ultrasonic pulse; S3: starting a dividing plate to rotate the fixed axis of the milling cutter; and at the same time driving the vibration module to move along the axial direction of the milling cutter; S4: the stress relieving operation is completed, and the milling cutter is removed.

[0013] Preferably, in step S3, after the vibration module moves along the axial direction of the milling cutter to complete the stress relief operation of a cutting edge, the dividing plate is driven to rotate so that the vibration part is aligned with the position of the next adjacent cutting edge, and the vibration module moves in the opposite direction along the axial direction of the milling cutter, driving the positioning part to rotate the fixed axis of the milling cutter in the opposite direction.

[0014] Preferably, in step S2, the coil of the ultrasonic pulse module is passed with pulses whose intensity gradually increases and then gradually decreases and whose frequency varies from 10kHz to 60kHz. By using electric pulse processing, transient energy can be periodically input to control and adjust the physical properties of the material, and electric pulses have a unique ability to improve the material.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This scheme can eliminate the stress of the milling cutter after fine machining, and at the same time can reduce the stress removal time, thereby improving the precision and life of the milling cutter edge; (2) The combination of vibration stress removal, magnetic stress removal and ultrasonic pulse stress removal improves the stress removal effect of the milling cutter; (3) The stress removal operation is simple and can be completed by automated equipment, which is stable and saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the present invention.

[0017] Figure 2 It is the front view of the present invention.

[0018] Figure 3 It is an exploded view of the vibration module of the present invention.

[0019] Figure 4 It is a schematic diagram of the structure on the working platform of the present invention.

[0020] Figure 5 It is an exploded view of the structure on the working platform of the present invention.

[0021] Figure 6 It is a schematic diagram of the positioning tooling of the present invention.

[0022] Figure 7 Schematic diagram of the locking part.

[0023] In the figure: 1. positioning tool, 2. positioning part, 3. vibration module, 4. vibration part, 5. working platform, 6. indexing plate, 7. fixed bracket, 8. vibration device, 9. fixed groove, 10. support plate, 11. magnetic module, 12. ultrasonic pulse module, 13. positioning bracket, 14. locking part, 15. rotating seat, 16. milling cutter, 17. vibration mounting plate, 18. first motor, 19. transmission gear, 20. punching , 21. Sliding plate, 22. Slide groove, 23. Embedded groove, 24. Rack, 25. Middle plate, 26. Support frame, 27. Dovetail protrusion, 28. Dovetail groove, 29. Slide plate, 30. Positioning mounting plate, 31. Second motor, 32. First gear, 33. Second gear, 34. Magnetic pole generator, 35. Magnetic pole mounting plate, 36. Articulated seat, 37. Operating part, 38. Pressure rod, 39. Support rod, 40. Tightening part. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0025] Example 1: Figures 1 to 5A stress relief device for a milling cutter shown in the figure includes structures such as a working platform 5, a positioning fixture 1, a vibration module 3, a magnetic module 11 and an ultrasonic pulse module 12. The working platform 5 is the basic support plate of the entire device. The positioning fixture 1 is arranged on the working platform 5 for fixing and positioning the milling cutter 16. The ultrasonic pulse module 12 is fixed on the working platform 5 and is located at the bottom of the positioning fixture 1. It can perform ultrasonic pulse stress relief on the milling cutter 16 on the positioning fixture 1. The vibration module 3 is arranged above the positioning fixture 1 and can perform vibration stress relief on the milling cutter 16 on the positioning fixture 1. The magnetic module 11 is arranged on both sides of the positioning fixture 1 and can perform magnetic stress relief on the milling cutter 16 on the positioning fixture 1. This solution is mainly used to relieve stress of the milling cutter 16 after fine machining. Through three stress relief methods, the stress relief effect of the milling cutter 16 is greatly improved. At the same time, the stress relief time can be reduced, and the precision and life of the cutting edge of the milling cutter 16 can be improved.

[0026] The vibration module 3 includes a vibration device 8, a fixing bracket 7, a vibration part 4 and other structures; specifically, two parallel fixing grooves 9 are provided on the working platform 5, and a support plate 10 is vertically fixedly provided in each fixing groove 9. The top of the support plate 10 is also provided with a connecting hole, and the fixing bracket 7 is rotatably connected to the connecting hole; Figure 1 or Figure 2 or Figure 3 As shown, the fixed bracket 7 is an inverted U-shaped structure and is located between two support plates 10. In the middle of the fixed bracket 7 is a horizontally arranged vibration mounting plate 17. A vibration device 8 is arranged at the bottom of the vibration mounting plate 17. The vibration device 8 can move as a whole in a horizontal direction. The moving direction is the same as the direction of the two parallel supported plates 10, that is, the axial direction of the milling cutter 16.

[0027] Specifically, a first motor 18 is arranged on the top of the vibration mounting plate 17, and a transmission gear 19 is fixedly connected to the output end of the first motor 18. A through hole 20 is provided on the vibration mounting plate 17 and corresponds to the position of the transmission gear 19. A part of the transmission gear 19 is arranged inside the through hole 20 and passes through the vibration mounting plate 17; a sliding plate 21 is provided at the bottom of the vibration mounting plate 17, and slide grooves 22 are provided on both sides of the sliding plate 21. The slide groove 22 is fixed at the bottom of the vibration mounting plate 17, and the sliding plate 21 is slidably connected in the slide groove 22. An embedded groove 23 is provided on the upper surface of the sliding plate 21, and a rack 24 is embedded in the embedded groove 23. The rack 24 is fixed inside the embedded groove 23 and meshes with the transmission gear 19 passing through the vibration mounting plate 17. A vibration device 8 is also arranged at the bottom of the sliding plate 21. Specifically, an intermediate plate 25 is arranged at the bottom of the sliding plate 21. The intermediate plate 25 is connected to the sliding plate 21 by bolts, and a certain interval is maintained between the intermediate plate 25 and the sliding plate 21. Two symmetrically distributed support frames 26 are arranged at the bottom of the intermediate plate 25. The support frame 26 is a Z-shaped plate structure. One side of the support frame 26 is fastened by screws or bolts. One end of the fastener is located in the interval between the sliding plate 21 and the intermediate plate 25. A vibration device 8 is arranged between the two support frames 26. The vibration device 8 is supported by the Z-shaped bottom of the two support frames 26. The vibration device 8 is a vibration generator. A vibration part 4 is arranged at the bottom of the vibration device 8. The vibration part 4 is in the shape of a rectangular plate, which can achieve the effect of vibration stress relief on the milling cutter 16; of course, the vibration part 4 can also be designed as a structure adapted to the cutting edge of the milling cutter 16 to achieve direct stress relief on the cutting edge surface of the milling cutter 16.

[0028] When the first motor 18 is started, the transmission gear 19 is driven to rotate, and the transmission gear 19 drives the rack 24 to move, so that the sliding plate 21 embedded with the rack 24 moves horizontally, thereby driving the vibration device 8 at the bottom to move horizontally. The surface of the milling cutter 16 is vibrated to remove stress by controlling the horizontal movement of the vibration device 8, so that the vibration part 4 of the vibration device 8 can vibrate on the cutting edge surface of the milling cutter 16 to remove stress.

[0029] It should be noted that, in addition to using the meshing transmission of the gear rack to achieve the sliding effect of the vibration device 8, a telescopic device can also be directly used to achieve the horizontal movement of the vibration device 8. Specifically, a telescopic cylinder (not shown in the figure) can be arranged on the top of the vibration mounting plate 17, and a connecting plate (not shown in the figure) is fixed to the telescopic end of the telescopic cylinder, and the connecting plate is also fixedly connected to the sliding plate 21, so that when the telescopic cylinder performs telescopic movement, the vibration device 8 can also achieve horizontal movement to achieve the same effect.

[0030] The positioning tool 1 is arranged on the working platform 5, and the positioning tool 1 is slidably connected to the working platform 5. Specifically, a dovetail protrusion 27 is provided on the working platform 5. The positioning tool 1 includes a slide plate 29. A dovetail groove 28 is provided at the bottom of the slide plate 29. The slide plate 29 and the dovetail protrusion 27 on the working platform 5 are slidably connected. Therefore, while ensuring the sliding connection between the slide plate 29 and the working platform 5, it is also ensured that the slide plate 29 and the working platform 5 will not be separated, thereby avoiding the influence of the vibration device 8 on the overall positioning tool 1. A positioning mounting plate 30 is vertically arranged on the slide plate 29, and a dividing plate 6 is fixed on the positioning mounting plate 30. The dividing plate 6 is a four-station dividing plate, and the dividing plate 6 faces the side where the vibration device 8 is located. The dividing plate 6 rotates 90 degrees each time. A positioning part 2 is arranged on the dividing plate 6. The positioning part 2 is a quick clamping structure, which is used to clamp and position the milling cutter 16, and the height position of the positioning part 2 is aligned with the position of the vibration part 4 when the vibration device 8 is in a vertical arrangement, so that after the positioning part 2 clamps the milling cutter 16, the milling cutter 16 can be just located on the lower surface of the vibration part 4 and directly contact the vibration part 4.

[0031] It should be noted that the positioning part 2 is rotatably connected to the dividing plate 6, and the rotation of the positioning part 2 and the rotation of the dividing plate 6 are independent of each other. The rotation of the dividing plate 6 is used for the overall rotation of the milling cutter 16, which is a one-time operation, and the rotation of the positioning part 2 is the rotation of the milling cutter 16 when it is vibrating to relieve stress, which is a continuous rotation. That is, when the milling cutter 16 is vibrating to relieve stress at the cutting edge, the rotation of the positioning part 2 enables the vibration part 4 to move along the spiral line of the cutting edge of the milling cutter 16, accurately perform vibration to relieve stress, and avoid vibration in other positions of the milling cutter.

[0032] It should also be noted that the fixed bracket 7 is rotatably connected to the two support plates 10. When the fixed bracket 7 is arranged in a vertical state, the fixed bracket 7 can only rotate toward the side away from the positioning fixture 1 to prevent the vibration part 4 on the fixed bracket 7 from crushing the milling cutter. When the fixed bracket 7 rotates toward the side away from the positioning fixture 1, the vibration device 8 above the positioning fixture 1 will be removed, so that the milling cutter 16 can be removed and replaced on the positioning fixture 1, and inspection and maintenance can also be performed when stress relief fails. In addition, a second motor 31 is also provided on the working platform 5. The output end of the second motor 31 is fixed with a first gear 32 structure, and a second gear 33 structure is provided corresponding to the rotation position of the fixed bracket 7 and the support plate 10. A toothed belt (not shown) is connected between the two gears, wherein the first gear 32 and the second gear 33 can also be pulleys, and the toothed belt can be a transmission belt. When the second motor 31 is started, the toothed belt can drive the fixed bracket 7 as a whole to rotate relative to the support plate 10.

[0033] The magnetic module 11 includes two magnetic pole generators 34, which are respectively arranged on two support plates 10. Specifically, a magnetic pole mounting plate 35 is arranged on each of the two support plates 10. The magnetic pole mounting plate 35 is horizontally arranged on the support plate 10 and symmetrically arranged about the positioning tool 1. A magnetic pole generator 34 is arranged on each of the two magnetic pole mounting plates 35. The two magnetic pole generators 34 can generate magnetic force and perform stress relief operation on the milling cutter 16 through the magnetostrictive effect.

[0034] The ultrasonic pulse module 12 includes an ultrasonic pulse generator, which is arranged on the slide plate 29 and is located directly below the positioning part 2. The ultrasonic pulse module 12 can perform ultrasonic pulse stress relief on the milling cutter 16, further improving the stress relief effect of the milling cutter 16. Through the high frequency, high efficiency and high energy under focusing of ultrasonic waves, the metal surface can produce a large compressive plastic deformation, while changing the original stress field, generating a certain value of compressive stress, so that the impacted part can be strengthened. This treatment can not only reduce the stress concentration caused by the excess height and eliminate the defects on the surface of the milling cutter 16, but also produce a large compressive plastic deformation at the milling cutter 16, thereby adjusting the residual stress field at the cutting edge of the milling cutter 16, so that the milling cutter 16 part is strengthened and hardened. In addition, ultrasonic pulse stress relief can also significantly improve the fatigue life and fatigue strength of the milling cutter 16.

[0035] Example 2: Figures 1 to 7 A stress relief device for a milling cutter shown in the figure includes structures such as a working platform 5, a positioning fixture 1, a vibration module 3, a magnetic module 11 and an ultrasonic pulse module 12. The working platform 5 is the basic support plate of the entire device. The positioning fixture 1 is arranged on the working platform 5 for fixing and positioning the milling cutter 16. The ultrasonic pulse module 12 is fixed on the working platform 5 and is located at the bottom of the positioning fixture 1. It can perform ultrasonic pulse stress relief on the milling cutter 16 on the positioning fixture 1. The vibration module 3 is arranged above the positioning fixture 1 and can perform vibration stress relief on the milling cutter 16 on the positioning fixture 1. The magnetic module 11 is arranged on both sides of the positioning fixture 1 and can perform magnetic stress relief on the milling cutter 16 on the positioning fixture 1. This solution is mainly used to relieve stress of the milling cutter 16 after fine machining. Through three stress relief methods, the stress relief effect of the milling cutter 16 is greatly improved. At the same time, the stress relief time can be reduced, and the precision and life of the cutting edge of the milling cutter 16 can be improved.

[0036] The vibration module 3 includes a vibration device 8, a fixing bracket 7, a vibration part 4 and other structures; specifically, two parallel fixing grooves 9 are provided on the working platform 5, and a support plate 10 is vertically fixedly provided in each fixing groove 9. The top of the support plate 10 is also provided with a connecting hole, and the fixing bracket 7 is rotatably connected to the connecting hole; Figure 1 or Figure 2 or Figure 3As shown, the fixed bracket 7 is an inverted U-shaped structure and is located between two support plates 10. In the middle of the fixed bracket 7 is a horizontally arranged vibration mounting plate 17. A vibration device 8 is arranged at the bottom of the vibration mounting plate 17. The vibration device 8 can move as a whole in a horizontal direction. The moving direction is the same as the direction of the two parallel supported plates 10, that is, the axial direction of the milling cutter 16.

[0037] Specifically, a first motor 18 is arranged on the top of the vibration mounting plate 17, and a transmission gear 19 is fixedly connected to the output end of the first motor 18. A through hole 20 is provided on the vibration mounting plate 17 and corresponds to the position of the transmission gear 19. A part of the transmission gear 19 is arranged inside the through hole 20 and passes through the vibration mounting plate 17; a sliding plate 21 is provided at the bottom of the vibration mounting plate 17, and slide grooves 22 are provided on both sides of the sliding plate 21. The slide groove 22 is fixed at the bottom of the vibration mounting plate 17, and the sliding plate 21 is slidably connected in the slide groove 22. An embedded groove 23 is provided on the upper surface of the sliding plate 21, and a rack 24 is embedded in the embedded groove 23. The rack 24 is fixed inside the embedded groove 23 and meshes with the transmission gear 19 passing through the vibration mounting plate 17. A vibration device 8 is also arranged at the bottom of the sliding plate 21. Specifically, an intermediate plate 25 is arranged at the bottom of the sliding plate 21. The intermediate plate 25 is connected to the sliding plate 21 by bolts, and a certain interval is maintained between the intermediate plate 25 and the sliding plate 21. Two symmetrically distributed support frames 26 are arranged at the bottom of the intermediate plate 25. The support frame 26 is a Z-shaped plate structure. One side of the support frame 26 is fastened by screws or bolts. One end of the fastener is located in the interval between the sliding plate 21 and the intermediate plate 25. A vibration device 8 is arranged between the two support frames 26. The vibration device 8 is supported by the Z-shaped bottom of the two support frames 26. The vibration device 8 is a vibration generator. A vibration part 4 is arranged at the bottom of the vibration device 8. The vibration part 4 is in the shape of a rectangular plate, which can achieve the effect of vibration stress relief on the milling cutter 16; of course, the vibration part 4 can also be designed as a structure adapted to the cutting edge of the milling cutter 16 to achieve direct stress relief on the cutting edge surface of the milling cutter 16.

[0038] When the first motor 18 is started, the transmission gear 19 is driven to rotate, and the transmission gear 19 drives the rack 24 to move, so that the sliding plate 21 embedded with the rack 24 moves horizontally, thereby driving the vibration device 8 at the bottom to move horizontally. The surface of the milling cutter 16 is vibrated to remove stress by controlling the horizontal movement of the vibration device 8, so that the vibration part 4 of the vibration device 8 can vibrate on the cutting edge surface of the milling cutter 16 to remove stress.

[0039] It should be noted that, in addition to using the meshing transmission of the gear rack to achieve the sliding effect of the vibration device 8, a telescopic device can also be directly used to achieve the horizontal movement of the vibration device 8. Specifically, a telescopic cylinder (not shown in the figure) can be arranged on the top of the vibration mounting plate 17, and a connecting plate (not shown in the figure) is fixed to the telescopic end of the telescopic cylinder, and the connecting plate is also fixedly connected to the sliding plate 21, so that when the telescopic cylinder performs telescopic movement, the vibration device 8 can also achieve horizontal movement to achieve the same effect.

[0040] The positioning tool 1 is arranged on the working platform 5, and the positioning tool 1 is slidably connected to the working platform 5. Specifically, a dovetail protrusion 27 is provided on the working platform 5. The positioning tool 1 includes a slide plate 29. A dovetail groove 28 is provided at the bottom of the slide plate 29. The slide plate 29 and the dovetail protrusion 27 on the working platform 5 are slidably connected. Therefore, while ensuring the sliding connection between the slide plate 29 and the working platform 5, it is also ensured that the slide plate 29 and the working platform 5 will not be separated, thereby avoiding the influence of the vibration device 8 on the overall positioning tool 1. A positioning mounting plate 30 is vertically arranged on the slide plate 29, and a dividing plate 6 is fixed on the positioning mounting plate 30. The dividing plate 6 is a four-station dividing plate, and the dividing plate 6 faces the side where the vibration device 8 is located. The dividing plate 6 rotates 90 degrees each time. A positioning part 2 is arranged on the dividing plate 6. The positioning part 2 is a quick clamping structure, which is used to clamp and position the milling cutter 16, and the height position of the positioning part 2 is aligned with the position of the vibration part 4 when the vibration device 8 is in a vertical arrangement, so that after the positioning part 2 clamps the milling cutter 16, the milling cutter 16 can be just located on the lower surface of the vibration part 4 and directly contact the vibration part 4.

[0041] It should be noted that the positioning part 2 is rotatably connected to the dividing plate 6, and the rotation of the positioning part 2 and the rotation of the dividing plate 6 are independent of each other. The rotation of the dividing plate 6 is used for the overall rotation of the milling cutter 16, which is a one-time operation, and the rotation of the positioning part 2 is the rotation of the milling cutter 16 when it is vibrating to relieve stress, which is a continuous rotation. That is, when the milling cutter 16 is vibrating to relieve stress at the cutting edge, the rotation of the positioning part 2 enables the vibration part 4 to move along the spiral line of the cutting edge of the milling cutter 16, accurately perform vibration to relieve stress, and avoid vibration in other positions of the milling cutter.

[0042] A positioning bracket 13 is also provided on the positioning mounting plate 30. The positioning bracket 13 is L-shaped and arranged horizontally. One end of the positioning bracket 13 is fixed on the positioning mounting plate 30, and the other end is arranged just in front of the positioning portion 2. After the positioning milling cutter 16 is clamped in the positioning portion 2, only one end of the milling cutter 16 is clamped by the fixing column, and the other end is a cantilever beam structure. Under the vibration of the vibration portion 4, the main part of the milling cutter 16 is prone to bending and other deformations, which will have an adverse effect on the milling cutter 16. Therefore, a rotating seat 15 is arranged at one end of the positioning bracket 13 located just in front of the positioning portion 2. The specific rotating seat 15 can be a bearing structure. On the one hand, it can provide support for one end of the milling cutter 16, which is not easy to bend and deform. On the other hand, it can also ensure the normal rotation of the milling cutter 16.

[0043] Specifically, a locking portion 14 is further provided on the positioning bracket 13, and the locking portion 14 is a locking bracket structure, such as Figure 7 As shown, the locking portion 14 includes an articulated seat 36, which is mounted on the positioning bracket 13. An operating portion 37 is hinged on the articulated seat 36, and a pressure rod 38 is hinged in the middle of the operating portion 37. One end of the pressure rod 38 is hinged to the operating portion 37, and the other end of the pressure rod 38 is hinged to a support rod 39. The hinge point of the pressure rod 38 and the support rod 39 is located in the middle of the support rod 39. The bottom of the support rod 39 is hinged to the articulated seat 36, and a rotating seat 15 is fixed to the top of the support rod 39, and the rotating seat 15 can rotate freely relative to the support rod 39. A tightening portion 40 is provided on the pressure rod 38, and the tightening portion 40 is provided above the pressure rod 38. When the operating portion 37 is rotated to a horizontal position, the tightening portion 40 of the pressure rod 38 will also be located in a horizontal position and tightened on the support rod 39, so that the support rod 39 is in a horizontal state and is locked by the action force between the operating portion 37, the pressure rod 38 and the support rod 39. At this time, the rotating seat 15 can be aligned with the end of the milling cutter 16. When the operating portion 37 is rotated downward, the locking state of the locking portion 14 can be released. Of course, the tightening portion 40 is provided at the lower part of the pressure rod 38, and the operating portion 37 is rotated upward to release the locking state of the locking portion 14, which can effectively avoid the influence of gravity on the operating portion 37.

[0044] It should also be noted that the fixed bracket 7 is rotatably connected to the two support plates 10. When the fixed bracket 7 is arranged in a vertical state, the fixed bracket 7 can only rotate toward the side away from the positioning fixture 1 to prevent the vibration part 4 on the fixed bracket 7 from crushing the milling cutter. When the fixed bracket 7 rotates toward the side away from the positioning fixture 1, the vibration device 8 above the positioning fixture 1 will be removed, so that the milling cutter 16 can be removed and replaced on the positioning fixture 1, and inspection and maintenance can also be performed when stress relief fails. In addition, a second motor 31 is also provided on the working platform 5. The output end of the second motor 31 is fixed with a first gear 32 structure, and a second gear 33 structure is provided corresponding to the rotation position of the fixed bracket 7 and the support plate 10. A toothed belt (not shown) is connected between the two gears, wherein the first gear 32 and the second gear 33 can also be pulleys, and the toothed belt can be a transmission belt. When the second motor 31 is started, the toothed belt can drive the fixed bracket 7 as a whole to rotate relative to the support plate 10.

[0045] The magnetic module 11 includes two magnetic pole generators 34, which are respectively arranged on two support plates 10. Specifically, a magnetic pole mounting plate 35 is arranged on each of the two support plates 10. The magnetic pole mounting plate 35 is horizontally arranged on the support plate 10 and symmetrically arranged about the positioning tool 1. A magnetic pole generator 34 is arranged on each of the two magnetic pole mounting plates 35. The two magnetic pole generators 34 can generate magnetic force and perform stress relief operation on the milling cutter 16 through the magnetostrictive effect.

[0046] The ultrasonic pulse module 12 includes an ultrasonic pulse generator, which is arranged on the slide plate 29 and is located directly below the positioning part 2. The ultrasonic pulse module 12 can perform ultrasonic pulse stress relief on the milling cutter 16, further improving the stress relief effect of the milling cutter 16. Through the high frequency, high efficiency and high energy under focusing of ultrasonic waves, the metal surface can produce a large compressive plastic deformation, while changing the original stress field, generating a certain value of compressive stress, so that the impacted part can be strengthened. This treatment can not only reduce the stress concentration caused by the excess height and eliminate the defects on the surface of the milling cutter 16, but also produce a large compressive plastic deformation at the milling cutter 16, thereby adjusting the residual stress field at the cutting edge of the milling cutter 16, so that the milling cutter 16 part is strengthened and hardened. In addition, ultrasonic pulse stress relief can also significantly improve the fatigue life and fatigue strength of the milling cutter 16.

[0047] Embodiment 3: A method for relieving stress of a milling cutter. In this solution, the milling cutter 16 has four spiral cutting edges, and is implemented using a stress relieving device for a milling cutter according to Embodiment 1 or Embodiment 2, and includes the following steps.

[0048] First, in the initial state, the positioning fixture 1 is located at one end of the working platform 5, the milling cutter 16 is fixed on the indexing plate 6 of the positioning fixture 1, and the milling cutter 16 is clamped and positioned using the quick clamping structure of the positioning part 2, and then the positioning fixture 1 is pushed to move on the working platform 5, and the milling cutter 16 is located at the bottom of the vibration device 8. If the milling cutter 16 is not in direct contact with the vibration part 4 of the vibration device 8 at this time, the vibration module 3 can be driven by the second motor 31 to rotate the entirety, so that the vibration part 4 of the vibration device 8 is in contact with the cutting edge of the milling cutter 16 on the positioning part 2.

[0049] After the vibration part 4 is aligned with the cutting edge of the milling cutter 16, the vibration device 8 is started, and the vibration part 4 of the vibration device 8 is pressed against the surface of the milling cutter 16 to perform a vibration stress relief operation. In order to enable the vibration part 4 to move along the spiral profile of the milling cutter 16, it is also necessary to start the first motor 18 and drive the positioning part 2 to rotate. The first motor 18 is started to drive the transmission gear 19 to rotate, and the transmission gear 19 drives the sliding plate 21 to slide, so that the vibration part 4 of the vibration device 8 can move along the axial direction of the milling cutter 16. At the same time, because the positioning part 2 can also clamp the milling cutter 16, the milling cutter 16 is rotated, so that the vibration part 4 of the vibration device 8 can move along the spiral profile of the cutting edge of the milling cutter 16.

[0050] When the vibration device 8 is started, the magnetic pole generator 34 and the ultrasonic pulse generator on both sides of the positioning tool 1 are started synchronously. The magnetic pole generator 34 can perform magnetic stress relief on the milling cutter 16, and the ultrasonic pulse generator can perform ultrasonic pulse stress relief on the milling cutter 16. In addition, the ultrasonic pulse generator has a heating function, which is achieved by converting the energy generated by ultrasonic waves in the medium into heat energy. The basic characteristics of ultrasound include high-frequency vibration and high-energy transfer. When this high-frequency vibration propagates in the medium, it can trigger a series of physical effects, including heating effects. When the frequency of the ultrasound matches the natural frequency of the molecules in the medium, it will cause the resonance of the molecules, greatly increase the vibration amplitude of the molecules, and then intensify the friction and collision between the molecules. This friction and collision will release energy, which is expressed in the form of heat energy, thereby increasing the temperature of the medium. The heating effect of the ultrasonic pulse generator is also beneficial to the stress relief effect of the milling cutter 16.

[0051] When the vibration part 4 completes the vibration stress relief of a spiral cutting edge of the milling cutter 16, the first motor 18 stops moving. At this time, the vibration device 8 no longer runs along the axial direction of the milling cutter 16 and is in a stopped state. Then, the indexing plate 6 is driven to rotate 90°, so that the next spiral cutting edge on the milling cutter 16 rotates to the bottom of the vibration part 4 and is close to the vibration part 4. Then, the positioning part 2 is driven to rotate in the reverse direction, and the first motor 18 is started to rotate in the reverse direction. At this time, the vibration part 4 of the driving device 8 will move along the second spiral cutting edge on the milling cutter 16. After completing the stress relief operation of the second spiral cutting edge, continue to repeat the above steps until the four spiral cutting edges of the milling cutter 16 have completed the stress relief operation. Finally, remove the milling cutter 16, replace the milling cutter 16 to be destressed, and repeat all the above steps.

[0052] It should be noted that in this solution, the rotation speed of the positioning part 2 is 0.5°m / sec, that is, the rotation speed of the milling cutter 16 is 0.5°m / sec, and the first motor 18 drives the sliding plate 21 to move at a speed of 1mm / sec, so as to ensure that the vibration part 4 of the vibration device 8 can move along the spiral profile of the cutting edge of the milling cutter 16. In addition, the coil of the ultrasonic pulse module 12 is passed through a pulse whose intensity gradually increases and then gradually decreases and whose frequency changes from 10kHz to 60kHz. The milling cutter 16 rotates one circle, and the pulse frequency also changes one cycle. By adopting electric pulse processing, transient energy can be periodically input to control and adjust the physical properties of the material.

Claims

1. A stress relief device for a milling cutter, characterized in that: include Positioning tooling, including a positioning portion; A vibration module, comprising a vibration part, wherein the vibration part is located above the positioning part; The positioning part can rotate along a fixed axis in the horizontal direction, and the vibration part can vibrate in the vertical direction; the vibration part can also move in the horizontal direction parallel to the axial direction of the positioning part.

2. A stress relief device for a milling cutter according to claim 1, characterized in that: It also includes a working platform, the positioning tool is slidably connected to the working platform, and the positioning tool also includes a dividing plate, and the dividing plate is provided with the positioning part.

3. A stress relief device for a milling cutter according to claim 2, characterized in that: The vibration module comprises a fixed bracket, a vibration device is arranged on the fixed bracket, the vibration device is connected to the fixed bracket in an axial sliding manner along the positioning portion, and the vibration portion is arranged at the bottom of the vibration device.

4. A stress relief device for a milling cutter according to claim 3, characterized in that: The working platform is also provided with a vertically arranged support plate, and the fixed bracket is rotatably connected to the support plate.

5. A stress relief device for a milling cutter according to any one of claims 1 to 4, characterized in that: It also includes a magnetic module, the position of the magnetic module is flush with the position of the positioning part.

6. A stress relief device for a milling cutter according to any one of claims 1 to 4, characterized in that: It also includes an ultrasonic pulse module, which is arranged below the positioning tooling.

7. A stress relief device for a milling cutter according to any one of claims 1 to 4, characterized in that: The positioning tool also includes a positioning bracket, the positioning bracket is provided with a locking portion, and the locking portion is provided with a rotating seat corresponding to the positioning portion.

8. A method for relieving stress of a milling cutter, characterized in that: The stress relief device for a milling cutter according to any one of claims 1 to 7 is implemented, comprising the following steps: S1: Fix the milling cutter on the positioning part, and make the cutting edge of the milling cutter abut against the bottom of the vibration part; S2: Start the vibration module, magnetic module and ultrasonic pulse module, and use the vibration part, magnetic force and ultrasonic pulse to perform stress relief operation on the milling cutter; S3: Start the indexing plate to drive the positioning part to rotate the fixed axis of the milling cutter; at the same time, drive the vibration module to move along the axial direction of the milling cutter; S4: The stress relief operation is completed and the milling cutter is removed.

9. A method for relieving stress of a milling cutter according to claim 8, characterized in that In step S3, after the vibration module moves along the axial direction of the milling cutter to complete the stress relief operation of a cutting edge, the dividing plate is driven to rotate so that the vibration part is aligned with the position of the next adjacent cutting edge. The vibration module then moves in the opposite direction along the axial direction of the milling cutter, and the positioning part is driven to rotate the fixed axis of the milling cutter in the opposite direction.

10. A method for relieving stress of a milling cutter according to claim 8, characterized in that: In step S2, the coil of the ultrasonic pulse module is passed through a pulse whose intensity gradually increases and then gradually decreases and whose frequency varies from 10 kHz to 60 kHz.

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