Machining device for snap spring groove of inner hole of part

Abstract

The invention discloses a part inner hole clamp spring groove machining device which comprises a driving assembly, a clutch assembly, a transmission assembly, a lifting rod assembly and an electric spark machining assembly. The clutch assembly is driven by the driving assembly, and the state of the clutch assembly can be switched; the driving assembly comprises a main motor and a motor gear installed at the output end of the main motor. The clutch assembly comprises a clutch rod, a clutch gear and a clutch friction wheel. When the clutch assembly is switched to the first state, the motor gear is meshed with the clutch gear, the clutch friction wheel is connected with the input end of the transmission assembly, and when the main motor works, the lifting rod assembly ascends or descends; when the clutch assembly is switched to the second state, the motor gear is meshed with the clutch gear, the clutch friction wheel is connected with the input end of the lifting rod assembly, and when the main motor works, the lifting rod assembly rotates in the axial direction.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing of a circlip groove, and in particular to a processing device for a circlip groove in an inner hole of a part. Background Art

[0002] In the prior art, engine cylinder head travel fixtures are available in two types: those without and those with circlip grooves, depending on the engine model. The traditional travel fixture manufacturing process involves turning the circlip grooves and then performing a quenching heat treatment. With the EVO2 engine cylinder head discontinued, the EVO2 model's travel fixture without circlip grooves needed to be modified to a GEN3 model with circlip grooves. However, due to the increased hardness of the quenching process, the circlip grooves could no longer be completed using traditional turning methods.

[0003] The general method of making a circlip groove is as follows:

[0004] 1. Small-diameter profiled grinding wheel grinding solution: This solution uses a custom-made profiled grinding wheel that matches the shape of the retaining spring groove, uses a precision fixture to fix the workpiece, and uses a high-speed electric spindle to drive the grinding wheel to grind the hardened hole wall. The core problem is that the grinding wheel diameter is limited by the aperture of the retaining spring groove, the profile of the micro-grinding wheel needs to be manufactured through electroplating or sintering processes, the pitch accuracy is difficult to control (error > ±0.01mm), and the insufficient distribution density of diamond abrasive grains leads to a short grinding wheel life. At the same time, the insufficient rigidity of the grinding wheel shaft can easily cause processing vibration, fluctuations in the groove width, and surface roughness Ra > 0.8μm. More seriously, a special dresser is required for grinding wheel dressing, and the dressing cost accounts for more than 40% of the total processing cost, making it extremely uneconomical.

[0005] 2. Carbide turning tool solution: This solution uses ultra-fine-grain carbide turning tools (such as YS8, hardness HRA92.5) to drive the tool through a CNC lathe to perform radial plunge turning on hardened holes (HRC60+). Its fundamental drawback is that the turning tool tip arc radius needs to match the narrow groove width (such as 0.8mm groove), but the cutting edge is prone to micro-chipping when cutting high-hardness materials, resulting in a gradual decrease in groove depth (reduced by 2-5μm per piece); the axial resistance during cutting exceeds 150N, and the aspect ratio of the small-diameter turning tool shank is greater than 5:1 (such as The tool bar overhang was 10mm, and insufficient rigidity caused the tool to deflect, resulting in a measured groove bottom position deviation of ±0.05mm. In addition, the high turning temperature (locally >800°C) caused diffusion wear of the cobalt in the tool's binder phase, forcing the tool to need replacement after a lifespan of less than 30 pieces, resulting in a machining efficiency as low as 4-6 minutes per groove.

[0006] In order to overcome the technical problems mentioned in the above-mentioned prior art, the present invention relates to a processing device for a retaining ring groove in an inner hole of a part. Summary of the Invention

[0007] In order to achieve the above-mentioned purpose, the present invention provides a processing device for a retaining ring groove in an inner hole of a part, comprising a drive assembly, a clutch assembly, a transmission assembly, a lifting rod assembly and an electrospark machining assembly; the clutch assembly is driven by the drive assembly, and the state of the clutch assembly is switchable; wherein the drive assembly comprises a main motor and a motor gear installed at the output end of the main motor; the clutch assembly comprises a clutch rod, a clutch gear and a clutch friction wheel; when the clutch assembly switches to a first state, the motor gear and the clutch gear are engaged, and the clutch friction wheel is connected to the input end of the transmission assembly, and when the main motor is working, the lifting rod assembly rises and falls; when the clutch assembly switches to a second state, the motor gear and the clutch gear are engaged, and the clutch friction wheel is connected to the input end of the lifting rod assembly, and when the main motor is working, the lifting rod assembly rotates around the axis.

[0008] Furthermore, the transmission assembly includes an intermediate friction wheel, a friction toggle wheel, a toggle rod, a rack component and a double gear; wherein the intermediate friction wheel is in contact with the friction toggle wheel, an axial toggle rod is provided in the circumferential direction of the friction toggle wheel, and the end of the toggle rod away from the friction toggle wheel is connected to the input end of the rack component, and the double gear includes two coaxially mounted double main gears and double sub gears, wherein the double main gear is connected to the output end of the rack component, and the double sub gear is engaged with the input end of the lifting platform assembly; when the clutch assembly is switched to the first state, the clutch friction wheel is in contact with the intermediate friction wheel.

[0009] Furthermore, the rack component is composed of a rack and a T-shaped piece, a through groove is provided in the transverse part of the T-shaped piece, and the end of the toggle rod away from the friction toggle wheel can slide in the through groove, the bottom of the T-shaped piece is connected to the rack, and the rack is engaged with the double main gear.

[0010] Furthermore, the lifting rod assembly includes a lifting rod and a lifting rod friction wheel. The lifting rod friction wheel is provided at the lower part of the lifting rod, and several corrugations from top to bottom are provided on the outer side of the middle part of the lifting rod, which engage with the double pinion gears. A processed part is installed on the top of the lifting rod; when the clutch assembly switches to the second state, the clutch friction wheel contacts the lifting rod friction wheel.

[0011] Furthermore, the EDM assembly includes a micro motor, a machining electrode head and a lever; wherein the first end of the lever is connected to the top of the machining electrode head, the output end of the micro motor is connected to the eccentric shaft through a coupling, the eccentric shaft is connected to the lever near the first end, the bottom end of the machining electrode head is the EDM end, and the second end of the lever is installed with an electric pulse generator.

[0012] Furthermore, the processing device for the retaining ring groove in the inner hole of the part also includes a switching device for the clutch assembly, the switching device includes a handle, a handle rod, a concave slider and a guide block, the clutch assembly also includes a disc, the disc is arranged at the bottom of the clutch rod, the disc is installed in the concave groove of the concave groove block, the bottom of the concave groove block is provided with a guide block, the outer side of the concave groove block is provided with a raised slider, a handle through groove is provided at the front part of the handle rod, the raised slider slides in the handle through groove, and a handle is provided at the tail of the handle rod. The handle is a force-applying end, which is used to switch the first state and the second state of the clutch assembly.

[0013] Furthermore, it also includes a locking screw and a locking screw seat, the output end of the locking screw seat is connected to the locking screw, and the locking screw is installed on the outside of the friction toggle wheel to lock the friction toggle wheel.

[0014] Furthermore, it also includes a base bracket, and the processing device for the retaining ring groove in the inner hole of the part is installed on the base bracket.

[0015] Furthermore, it also includes a shell, which is partially or completely installed on the processing device of the retaining ring groove in the inner hole of the part or the outside of the base bracket.

[0016] Furthermore, the inner hole retaining ring groove of the part processed is the inner hole retaining ring groove of the accompanying fixture.

[0017] The main beneficial effects of the present invention are: the processing device for the retaining ring groove in the inner hole of the part of the present invention has a simple structure, and a driving source can perform the two major functions of lifting and rotating the lifting rod through the clutch assembly; in addition, the device uses electric spark machining technology and micro motors to meet the processing needs of retaining ring grooves in the inner holes of small-sized parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a three-dimensional structure at a certain angle in one embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle I direction;

[0020] Figure 3 is a schematic diagram of a three-dimensional structure from another angle in one embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the local approach in the middle IV direction;

[0022] Figure 5 This is an installation diagram of an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of a partial structure after removing the outer shell in one embodiment of the present invention;

[0024] Figure 7 Schematic diagram of a three-dimensional structure with a housing at a certain angle in one embodiment of the present invention;

[0025] Figure 8 A schematic diagram of a three-dimensional structure with a housing from another angle in one embodiment of the present invention;

[0026] Figure 9 This is a front view of an embodiment of the present invention;

[0027] Figure 10 for Figure 9 Schematic diagram of the middle DD direction;

[0028] Figure 11 for Figure 10 Schematic diagram of the FF direction;

[0029] Figure 12 is a top view of an embodiment of the present invention;

[0030] Figure 13 A side view of an embodiment of the present invention;

[0031] Figure 14 for Figure 13 Schematic diagram of CC direction;

[0032] Figure 15 for Figure 13 Schematic diagram of the GG direction;

[0033] Figure 16 This is a schematic diagram of the installation of a clutch assembly in one embodiment of the present invention;

[0034] Figure 17 This is a schematic diagram of the installation of some components in a switching device of a clutch assembly in one embodiment of the present invention;

[0035] Figure 18 FIG. 1 is a schematic diagram of a rack component in one embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will further explain and illustrate the processing device for the inner hole retaining ring groove of the part described in the present invention in combination with the drawings and specific embodiments of the specification. However, this explanation and illustration does not constitute an improper limitation to the technical solution of the present invention.

[0037] refer to Figure 1 Combined with Figure 2 — Figure 15In one embodiment of the present invention, a processing device for a retaining ring groove in an inner hole of a part is provided, comprising a driving assembly, a clutch assembly 2, a transmission assembly, a lifting rod assembly and an electrospark machining assembly; the driving assembly drives the clutch assembly, and the state of the clutch assembly 2 can be switched; wherein the driving assembly comprises a main motor 1 and a motor gear 11 installed at the output end of the main motor; the clutch assembly 2 comprises a clutch rod 20, a clutch gear 21 and a clutch friction wheel 22; when the clutch assembly 2 switches to the first state, the motor gear 11 and the clutch gear 21 are engaged (refer to Figure 10 ), and the clutch friction wheel 22 is connected to the input end of the transmission assembly. When the main motor 1 is working, the lifting rod assembly rises or falls; when the clutch assembly 2 switches to the second state, the motor gear 11 and the clutch gear 21 are engaged, and the clutch friction wheel 22 is connected to the input end of the lifting rod assembly. When the main motor 1 is working, the lifting rod assembly rotates around the axis.

[0038] As a preferred option, the transmission assembly includes an intermediate friction wheel 31, a friction toggle wheel 32, a toggle rod 33, a rack component 34 and a double gear 35; wherein the intermediate friction wheel 31 is in contact with the friction toggle wheel 32, and an axial toggle rod 33 is provided in the circumferential direction of the friction toggle wheel 32, and the end of the toggle rod 33 away from the friction toggle wheel 32 is connected to the input end of the rack component 34, and the double gear 35 includes two coaxially mounted double main gears 351 and double sub-gears 352, wherein the double main gear 351 is engaged with the output end of the rack component 34, and the double sub-gear 352 is connected to the input end of the lifting platform assembly; when the clutch assembly switches to the first state, the clutch friction wheel 22 is in contact with the intermediate friction wheel 31.

[0039] As another preferred option, the intermediate friction wheel 31 and the friction shifting wheel 32 may also be replaced by another transmission form of gears.

[0040] As a preferred option, the rack component 34 is composed of a rack 342 and a T-shaped piece 343. A through groove 344 is provided in the transverse portion of the T-shaped piece. The end of the toggle rod 33 away from the friction toggle wheel 32 can slide in the through groove 34. The bottom of the T-shaped piece is connected to the rack 342, and the rack 342 is engaged with the double main gear 351.

[0041] As a preferred option, the lifting rod assembly includes a lifting rod 41 and a lifting rod friction wheel 42. The lifting rod friction wheel 42 is provided at the lower part of the lifting rod 41, and several corrugations 43 from top to bottom are provided on the outer side of the middle part of the lifting rod 41, which are engaged with the double pinion 352, and a processing part 44 is installed on the top of the lifting rod 41; when the clutch assembly switches to the second state, the clutch friction wheel 22 contacts the lifting rod friction wheel 42.

[0042] As another preferred option, the clutch friction wheel 22 and the lifting rod friction wheel 42 can also be replaced by another transmission form of gears.

[0043] As an option, refer to Figure 1 Combined with Figure 2 The EDM assembly includes a micro motor 51, a machining electrode head 52 and a lever 53; the first end of the lever 53 is connected to the top of the machining electrode head 52, the output end of the micro motor 51 is connected to the eccentric shaft 55 through a coupling 54, the eccentric shaft 55 is connected to the lever 53 near the first end, the bottom end of the machining electrode head 52 is the EDM end (not marked in the figure), and the second end of the lever 53 is installed with an electric pulse generator (not marked in the figure).

[0044] It can be understood that the electric pulse generator is electrically connected to the machining electrode head 52, and the machining electrode head 52 outputs electrical energy when the inner cavity retaining spring groove is electrospark machined.

[0045] As a preferred option, refer to Figure 1 Combined with Figure 17 The processing device for the retaining ring groove in the inner hole of the part also includes a switching device of the clutch assembly, the switching device includes a handle 61, a handle rod 62, a concave slider 63 and a guide block 64, the clutch assembly also includes a disc 23, the disc 23 is arranged at the bottom of the clutch rod 20, the disc 23 is installed in the concave groove 67 of the concave groove block 63, the bottom of the concave groove block 63 is provided with a guide block 64, the outer side of the concave groove block 63 is provided with a raised slider 65, a handle through groove 66 is provided at the front part of the handle rod, the raised slider 65 slides in the handle through groove 66, and a handle 61 is provided at the tail end of the handle rod 62. The handle 61 is a force-applying end, which is used to switch the first state and the second state of the clutch assembly.

[0046] As a preferred option, it also includes a locking screw 71 and a locking screw seat 72. The output end of the locking screw seat 72 is connected to the locking screw 71. The locking screw 71 is installed on the outside of the friction toggle wheel 32, which can lock the friction toggle wheel 32.

[0047] As a preferred option, a base bracket 81 is further included, and a processing device for the retaining ring groove in the inner hole of the part is installed on the base bracket 81.

[0048] As a preferred option, it also includes a housing 82 (refer to Figure 7 and Figure 8 ), the outer shell 82 is partially or completely installed on the processing device of the inner hole retaining ring groove of the part or the outer side of the base bracket 81.

[0049] As a preferred option, the inner hole retaining ring groove of the processed part is the inner hole retaining ring groove of the accompanying fixture.

[0050] Continue to refer Figure 1A guide rail seat 100 is also installed on the base bracket 81, and a dovetail guide rail pair 101 is provided between the rack 342 and the guide rail seat 100; a bracket 102 of an EDM assembly is also installed on the base bracket 81, and the micro motor 51, the machining electrode head 52 and the lever 53 are all installed on the bracket 102 of the EDM assembly; the limit screw 103 is installed on the fulcrum of the lever 53, and the fulcrum is installed on the bracket 102 of the EDM assembly.

[0051] Continue to refer Figure 3 Combined with Figure 5 The clutch gear 21 is rotationally connected to the clutch gear shaft and the bearing seat 210 of the clutch gear.

[0052] Continue to refer Figure 5 The base bracket is respectively provided with an intermediate friction wheel mounting hole 310, a friction toggle wheel mounting hole 320, and a clutch friction wheel mounting hole 220. The base bracket is also provided with a lifting rod guide sleeve 410, and the lifting rod 41 is installed on the guide sleeve 410. The bottom of the bracket 102 of the EDM assembly is also provided with a handle rod fulcrum hole 620. The fulcrum of the handle rod is installed in this fulcrum hole 620 through a pin, and the guide hole 110 is rotatably connected to the motor gear 11 through an axis component.

[0053] The working principle of the present invention is: when the handle is moved, the handle rod rotates in one direction, and the handle slot of the handle rod drives the raised slider in the handle slot to slide. After the raised slider transmits power through the guide block, the concave slot block, and the disc, the clutch friction wheel contacts the intermediate friction wheel, forming the first state of the clutch assembly, the main motor starts working, the motor gear drives the clutch gear, the clutch gear drives the clutch friction wheel, the clutch friction wheel drives the intermediate friction wheel, and the intermediate friction wheel transmits power through the friction toggle wheel, the toggle rod, the rack and the double gear, and the double pinion engages with the corrugation of the lifting platform to drive the lifting rod to rise. The output of the micromotor drives the eccentric shaft through the coupling, and the eccentric shaft drives the machining electrode head to enter the machining area of the internal cavity of the machining part and starts machining. The machining electrode head generates electric sparks to cut into the internal cavity. After the electric spark machining end cuts into the required retaining ring groove depth of the machined part, the micromotor stops rotating and the cutting ends. It is also understood that the workpiece is mounted on top of the lift rod, and its rotation drives the workpiece to rotate synchronously. During machining, the handle slot in the handle rod drives the raised slider in the handle slot to slide. After the raised slider transmits power through the guide block, the concave slot block, and the disc, the clutch friction wheel contacts the lift rod friction wheel, forming the second state of the clutch assembly. The main motor then activates, the motor gear drives the clutch gear, which in turn drives the clutch friction wheel, which in turn drives the lift rod friction wheel, thereby driving the lift rod and the workpiece to rotate synchronously. When the lift rod is axially rotating to form the retaining ring groove, the locking screw locks the friction toggle wheel, preventing it from rotating, thereby preventing the lift rod from moving up and down and causing failure in the retaining ring groove machining. After machining is completed, the micromotor reverses, allowing the EDM end to disengage from the inner surface of the retaining ring groove. Operating the handle lowers the lift rod, allowing the EDM end to be removed from the hole in the workpiece.

[0054] It should be noted that the prior art within the scope of protection of the present invention is not limited to the embodiments given in this application document. All prior art that does not contradict the solutions of the present invention, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included in the scope of protection of the present invention.

[0055] In addition, the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0056] It should also be noted that the above-listed embodiments are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above-listed embodiments. Similar variations or modifications that can be directly derived from or easily conceived by those skilled in the art based on the disclosure of the present invention should fall within the scope of protection of the present invention.

Claims

1. A processing device for a retaining ring groove in an inner hole of a part, characterized by: It includes a driving assembly, a clutch assembly, a transmission assembly, a lifting rod assembly and an EDM assembly; the driving assembly drives the clutch assembly, and the state of the clutch assembly can be switched; wherein, The driving assembly includes a main motor and a motor gear installed at the output end of the main motor; the clutch assembly includes a clutch rod, a clutch gear and a clutch friction wheel; when the clutch assembly is switched to a first state, the motor gear and the clutch gear are engaged, and the clutch friction wheel is connected to the input end of the transmission assembly. When the main motor is working, the lifting rod assembly rises or falls; when the clutch assembly is switched to a second state, the motor gear and the clutch gear are engaged, and the clutch friction wheel is connected to the input end of the lifting rod assembly. When the main motor is working, the lifting rod assembly rotates around the axis.

2. The processing device for the retaining ring groove in the inner hole of a component according to claim 1, characterized in that: The transmission assembly includes an intermediate friction wheel, a friction toggle wheel, a toggle rod, a rack component and a double gear; wherein the intermediate friction wheel contacts the friction toggle wheel, an axial toggle rod is provided in the circumferential direction of the friction toggle wheel, and the end of the toggle rod away from the friction toggle wheel is connected to the input end of the rack component, and the double gear includes two coaxially mounted double main gears and double sub gears, wherein the double main gear is connected to the output end of the rack component, and the double sub gear is engaged with the input end of the lifting platform assembly; when the clutch assembly is switched to the first state, the clutch friction wheel contacts the intermediate friction wheel.

3. The processing device for the retaining ring groove in the inner hole of a component according to claim 2, characterized in that: The rack component consists of a rack and a T-shaped piece. A through groove is provided in the transverse part of the T-shaped piece. The end of the toggle rod away from the friction toggle wheel can slide in the through groove. The bottom of the T-shaped piece is connected to the rack, and the rack is engaged with the double main gear.

4. The processing device for the retaining ring groove in the inner hole of a component according to claim 3, characterized in that: The lifting rod assembly includes a lifting rod and a lifting rod friction wheel. The lifting rod friction wheel is provided at the lower part of the lifting rod, and several corrugations from top to bottom are provided on the outer side of the middle part of the lifting rod, which are engaged with the double pinion gear. A processing part is installed on the top of the lifting rod. When the clutch assembly switches to the second state, the clutch friction wheel contacts the lifting rod friction wheel.

5. The processing device for the retaining ring groove in the inner hole of a component according to claim 4, characterized in that: The EDM assembly includes a micro motor, a machining electrode head and a lever; the first end of the lever is connected to the top of the machining electrode head, the output end of the micro motor is connected to the eccentric shaft through a coupling, the eccentric shaft is connected to the lever near the first end, the bottom end of the machining electrode head is the EDM end, and the second end of the lever is installed with an electric pulse generator.

6. The device for processing a retaining ring groove in a component inner hole according to claim 5, characterized in that: The processing device for the retaining ring groove in the inner hole of the part also includes a switching device of the clutch assembly, the switching device includes a handle, a handle rod, a concave slider and a guide block, the clutch assembly also includes a disc, the disc is arranged at the bottom of the clutch rod, the disc is installed in the concave groove of the concave groove block, the bottom of the concave groove block is provided with a guide block, the outer side of the concave groove block is provided with a raised slider, a handle groove is provided at the front part of the handle rod, the raised slider slides in the handle groove, and a handle is provided at the tail of the handle rod. The handle is a force-applying end, which is used to switch the first state and the second state of the clutch assembly.

7. The device for processing a retaining ring groove in a component inner hole according to any one of claims 2 to 6, characterized in that: It also includes a locking screw and a locking screw seat. The output end of the locking screw seat is connected to the locking screw. The locking screw is installed on the outside of the friction toggle wheel and can lock the friction toggle wheel.

8. The device for processing a retaining ring groove in a component inner hole according to claim 7, characterized in that: It also includes a base bracket, and the processing device for the retaining ring groove in the inner hole of the part is installed on the base bracket.

9. The processing device for the retaining ring groove in the inner hole of a component according to claim 8, characterized in that: It also includes a shell, which is partially or completely installed on the processing device of the retaining ring groove in the inner hole of the part or the outer side of the base bracket.

10. The processing device for the retaining ring groove in the inner hole of a component according to claim 9, characterized in that: The inner hole retaining ring groove of the part being processed is the inner hole retaining ring groove of the accompanying fixture.

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