A small short shaft forming gear grinding fixture

Abstract

The utility model relates to a clamp, concretely relates to a small short shaft forming gear grinding clamp, solves the technical problem that small short shaft type parts cannot be processed due to the interference of existing machine tool clamp, gear grinding clamp, grinding wheel and tool rest because of the limitation of forming gear grinding, the small short shaft forming gear grinding clamp, including the coaxial setting base, front centre, drive clamp, locking clamp, tail centre and positioning piece, the base is provided with mounting hole along the axial direction, the front end of front centre is inserted into mounting hole, drive clamp is sleeved in the rear end of front centre, and the front end of drive clamp is used for locking the rear end of front centre, locking clamp is sleeved in the front end of the part to be processed, and the position corresponding with the convex on the lateral wall of locking clamp is provided with recess through both ends in the position, the recess wall is abutted with threaded hole through the tie bolt and recess, and then the drive clamp and locking clamp are clamped tightly, the front end of tail centre is abutted with the rear end of the part to be processed, the rear end is connected with machine tool tailstock, and the rotation frequency of tail centre and front centre is same.

Description

Technical Field

[0001] This utility model relates to a clamp, specifically a small short shaft forming gear grinding clamp. Background Technology

[0002] The demand for high-precision gears is an inevitable trend in market development, and the replacement of traditional shaving processes with grinding processes is a development trend for high-end gears. As a branch of grinding processes, profile grinding offers advantages such as flexible adjustment and wide applicability. However, during processing, profile grinding is limited by machine tool fixtures and interference from grinding fixtures, grinding wheels, and tool holders, making it unsuitable for machining small, short shaft parts.

[0003] Chinese patent CN106513869A discloses a "face-driven small gear shaft grinding fixture", comprising an upper center, a clamping sleeve, a floating center, a first set screw, an end-face pawl, a pin, a center seat, a second set screw, a spring, a connecting seat, and an adjusting nut. The upper center is installed inside the tailstock sleeve of a machine tool, and its axial movement is achieved by the pressure of the tailstock. The lower end of the upper center abuts against the center hole at the upper end of the gear shaft. The clamping sleeve is fitted onto the outer circle at the lower end of the gear shaft, and the clamping sleeve is fixed or released from the gear shaft by the first set screw located on the side of the clamping sleeve. The center seat is fixed to the top of the connecting seat. The center seat is provided with circumferentially distributed end-face pawls, and the pin is embedded in the radial holes of the center seat and the end-face pawls. The end-face pawls cut into the end face of the clamping sleeve located above the center seat. The center seat and the connecting seat are provided with a central hole, and the floating center is installed in the central hole. The spring force causes the upper end of the floating center to abut against the center hole at the lower end of the gear shaft. This fixture can meet the requirements of high precision and batch processing of gear shaft grinding.

[0004] Chinese patent CN217095616U discloses a "hydraulic gear grinding fixture and its working method," which includes a body with a central hole, a pull rod disposed within the central hole, both ends of the pull rod extending out of the central hole, an upper pressure cap fixed to the top of the pull rod, a frustum-shaped top of the body, a support base fixed to the bottom of the frustum, an expansion sleeve disposed on the support base, a standard expansion sleeve component disposed on the outside of the expansion sleeve, a sliding piston disposed at the bottom of the body, the pull rod connected to the sliding piston, a base disposed at the bottom of the body, and several springs disposed on the base that contact the sliding piston. The fixture can be switched by simply replacing the expansion sleeve, pull rod, support base, and upper pressure cap each time. It is compatible with toothed parts with a bore diameter of 35-120mm. This fixture has an automated loading and unloading function. The fixture must not only have an automatic clamping function but also an automatic releasing function. It is simple and convenient to use and improves work efficiency.

[0005] However, none of the gear grinding fixtures can solve the technical problem that shaped gear grinding cannot process small short shaft parts. Utility Model Content

[0006] The purpose of this utility model is to solve the technical problem that forming gear grinding cannot process small and short shaft parts due to the limitations of existing machine tool fixtures, grinding fixtures, grinding wheels and tool holders, and to provide a small and short shaft forming gear grinding fixture.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A small short shaft forming gear grinding fixture is characterized by including a base, a front center, a drive clamp, a locking clamp, a tail center, and positioning components arranged coaxially.

[0009] The base has mounting holes along the axial direction. The front end of the base is connected to the machine tool spindle. The rear side wall has positioning holes that are compatible with the positioning parts along the radial direction. The positioning holes are connected to the mounting holes.

[0010] The front end of the center is inserted into the mounting hole, and a positioning groove adapted to the positioning element is provided at the position corresponding to the positioning hole on the front end of the center; the positioning element passes through the positioning hole and abuts against the positioning groove, thereby restricting the circumferential and axial displacement of the center; the rear end of the center is used to abut against the front end of the part to be processed.

[0011] The drive clamp is a cylindrical structure, which is sleeved on the rear end of the front center. The front end of the drive clamp is used to lock the rear end of the front center. A protrusion is provided on one side of the rear end of the drive clamp. The protrusion has a threaded hole along the width direction, and a tightening bolt is provided in the threaded hole.

[0012] The locking clamp is a cylindrical structure that is fitted onto the front end of the part to be processed. The side wall of the locking clamp has a groove that runs through both ends of the protrusion at a position corresponding to the protrusion. The width of the groove is greater than the width of the protrusion, and the axial length of the groove is greater than or equal to the axial length of the protrusion. The tightening bolt passes through the threaded hole and abuts against the groove wall to clamp the driving clamp and the locking clamp.

[0013] The front end of the tailstock tip abuts against the rear end of the workpiece to be processed, and the rear end is connected to the tailstock of the machine tool.

[0014] Furthermore, the side wall of the drive clamp is provided with multiple sets of first locking holes along the tangential direction, and a strip-shaped notch is provided along the axial direction through its front end, and the strip-shaped notch is connected to the multiple sets of first locking holes respectively; a first locking bolt is provided in the first locking hole, and the inlet and outlet of the first locking hole are located on both sides of the strip-shaped notch respectively; the first locking bolt passes through the first locking hole to lock the rear end of the front center.

[0015] Furthermore, an arc-shaped notch is provided circumferentially on the side wall of the drive clamp; the arc-shaped notch is perpendicularly connected to the strip-shaped notch.

[0016] Furthermore, the side wall of the locking clamp is provided with a second locking hole tangentially and a notch communicating with the center of the locking clamp radially; the inlet and outlet of the second locking hole are located on both sides of the notch; a second locking bolt is provided in the second locking hole; the second locking bolt passes through the second locking hole to lock the front end of the part to be processed.

[0017] Furthermore, the side wall of the locking clamp is provided with multiple strip-shaped blind holes extending through both ends of the clamp in a radial direction; the position of the strip-shaped blind holes near the center of the locking clamp is set as an arc-shaped groove.

[0018] Furthermore, the front end of the leading tip is provided with a first through hole; the rear end of the tail tip is provided with a second through hole.

[0019] Furthermore, the diameter of the front tip gradually increases from front to back; the diameter of the tail tip gradually decreases from front to back.

[0020] Furthermore, a limit ring is provided on the outer wall of the tail tip.

[0021] Furthermore, the base includes a first cylindrical segment, a second cylindrical segment, a conical segment, and a third cylindrical segment coaxially connected from front to back; the diameter of the first cylindrical segment is larger than the diameter of the second cylindrical segment; the diameter of the third cylindrical segment is smaller than the diameter of the second cylindrical segment; the large end of the conical segment is connected to the second cylindrical segment, and the small end is connected to the third cylindrical segment; the mounting hole is a stepped hole, the large end of which is adapted to the machine tool spindle and located in the first and second cylindrical segments, and the small end is adapted to the front end of the center and located in the second, conical, and third cylindrical segments; the positioning hole is radially disposed on the third cylindrical segment.

[0022] Furthermore, there are two sets of first locking holes, arranged axially; the front center adopts a Morse taper #5.

[0023] The beneficial effects of this utility model are:

[0024] 1. The base of this utility model can effectively avoid interference between the grinding wheel tool holder and the spindle headstock of the gear grinding machine. The center hole of the shaft end of the workpiece is positioned by double centers (i.e., front center and tail center), which can ensure that the coaxiality of the workpiece is within 0.005; the positioning accuracy is high, up to 0.005; the clamping length adjustment range can reach 400mm.

[0025] 2. This utility model is applicable to the processing of shaft gears with an outer diameter ≥30mm and a length ≥85mm; it adopts an extended base, double center positioning and clamp drive structure, which expands the processing capability of the forming gear grinding machine.

[0026] 3. This utility model utilizes a locking clamp to hold the workpiece on its outer diameter, which can drive the workpiece to rotate synchronously. It is stable and reliable, and can ensure the indexing requirements of the gear grinding process. It enables the forming gear grinding machine to process small short shafts. Moreover, the locking clamp with different inner holes can clamp workpieces of different diameters, making it highly applicable.

[0027] 4. This utility model solves the problem of interference in small short shaft gear grinding, expands the processing range of forming gear grinding machine tools, has a simple structure, is quick to disassemble, and reduces fixture costs.

[0028] 5. This utility model utilizes a driving clamp to drive and lock the clamp. The driving clamp is locked by the first locking bolt, which is reliable and can also avoid the grinding wheel, enabling the processing of smaller gears.

[0029] 6. This utility model increases the elasticity of the drive clamp by setting a strip-shaped notch along the axial direction on the drive clamp, which helps the drive clamp deform and tighten; an arc-shaped notch is set along the circumferential direction on the side wall of the drive clamp to separate the front and rear sections of the drive clamp, so that the rear section does not deform and improves rigidity.

[0030] 7. This utility model increases the elasticity of the locking clamp by setting a notch communicating with the center of the locking clamp in the radial direction and setting multiple strip-shaped blind holes in the radial direction. The position of the strip-shaped blind holes near the center of the locking clamp 4 is set as an arc-shaped groove to prevent the locking clamp from breaking when it deforms. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0032] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the first cylindrical segment in an embodiment of this utility model;

[0034] Figure 4 This is a schematic diagram of the structure of the driving clamp in an embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram of the locking clamp structure in an embodiment of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Base, 11-Mounting hole, 12-Positioning hole, 13-First cylindrical section, 14-Second cylindrical section, 15-Conical section, 16-Third cylindrical section, 2-Front center, 3-Drive clamp, 31-Protrusion, 32-Tightening bolt, 33-First locking hole, 34-Strip notch, 35-First locking bolt, 36-Arc notch, 4-Locking clamp, 41-Groove, 42-Second locking hole, 43-Second locking bolt, 44-Notch, 45-Strip blind hole, 5-Tail center, 51-Limiting ring, 6-Positioning component, 7-Grinding wheel tool. Detailed Implementation

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, a small short shaft forming gear grinding fixture includes a base 1, a front center 2, a drive clamp 3, a locking clamp 4, a tail center 5, and positioning components 6 and multiple connecting components, all coaxially arranged. The base 1 has a cylindrical structure with mounting holes 11 along its axial direction. A first cylindrical section 13, a second cylindrical section 14, a conical section 15, and a third cylindrical section 16 are coaxially connected from front to back. The diameter of the first cylindrical section 13 is larger than the diameter of the second cylindrical section 14; the diameter of the third cylindrical section 16 is smaller than the diameter of the second cylindrical section 14; the large end of the conical section 15 is connected to the second cylindrical section 16. Section 14 is connected, and the small end is connected to the third cylindrical section 16; the mounting hole 11 is a stepped hole, the large end of which is adapted to the machine tool spindle and is located in the first cylindrical section 13 and the second cylindrical section 14, and the small end is adapted to the front end of the front center 2 and is located in the second cylindrical section 14, the tapered section 15, and the third cylindrical section 16; the side wall of the third cylindrical section 16 is provided with a positioning hole 12 that is adapted to the positioning member 6 along the radial direction. The positioning hole 12 is connected to the mounting hole 11. The positioning member 6 is pressed against the outer circle of the tapered surface of the front center 2 through the positioning hole 12 to ensure the circumferential positioning of the front center 2.

[0039] The front center 2 is made of Morse taper #5, which has a self-locking function, and its diameter gradually increases from front to back. The front end of the front center 2 is inserted into the small end of the stepped hole, and the front end of the front center 2 is provided with a positioning groove that matches the positioning member 6 at the position corresponding to the positioning hole 12. The positioning member 6 passes through the positioning hole 12 and abuts against the positioning groove, thereby restricting the circumferential and axial displacement of the front center 2. The rear end of the front center 2 is provided with an L-shaped first through hole, which can prevent air from being trapped and unable to be installed in place during installation. The rear end of the front center 2 is used to abut against the front end of the part to be processed.

[0040] like Figure 4As shown, the driving clamp 3 is a cylindrical structure, which is sleeved on the rear end of the front center 2; the driving clamp 3 has two sets of first locking holes 33 tangentially, and the two sets of first locking holes 33 are arranged axially, with the inlet and outlet of the first locking holes 33 located on both sides of the strip-shaped notch 34; a strip-shaped notch 34 is provided axially through its front end; the strip-shaped notch 34 is connected to multiple sets of first locking holes 33 to increase the elasticity of the driving clamp 3 and help the driving clamp 3 deform and clamp; the first locking holes 33 are provided with a first A locking bolt 35 passes through a first locking hole 33 to lock the rear end of the front tip 2. A protrusion 31 is provided on one side of the rear end of the drive clamp 3 for moving the locking clamp 4 in a circular motion. A threaded hole is provided along the width direction of the protrusion 31, and a tightening bolt 32 is provided in the threaded hole. An arc-shaped notch 36 is provided along the circumferential direction on the side wall of the drive clamp 3. The arc-shaped notch 36 is perpendicularly connected to the strip-shaped notch 34 to separate the front and rear sections of the drive clamp 3, so that the rear section does not deform and improves rigidity.

[0041] like Figure 5 As shown, the locking clamp 4 is a cylindrical structure, which is sleeved on the front end of the part to be processed; the side wall of the locking clamp 4 has a second locking hole 42 tangentially provided and a notch 44 radially provided, which passes through both ends and communicates with the center of the locking clamp 4; the inlet and outlet of the second locking hole 42 are located on both sides of the notch 44, and the notch 44 is used to increase the elasticity of the locking clamp 4; a second locking bolt 43 is provided in the second locking hole 42, and the locking clamp 4 has a groove 41 that passes through both ends at the position corresponding to the protrusion 31, which is used to utilize the top The tightening bolt 32 and the protrusion 31 can press against the groove wall of the locking clamp 41, and the width of the groove 41 is greater than the width of the protrusion 31, and the axial length of the groove 41 is greater than or equal to the axial length of the protrusion 31, so that the axial position of the locking clamp 4 can be adjusted; the tightening bolt 32 passes through the threaded hole and abuts against the groove wall of the groove 41 to lock the drive clamp 3 and the locking clamp 4; a second locking bolt 43 is provided in the second locking hole 42, and the second locking bolt 43 passes through the second locking hole 42 to lock the front end of the workpiece to be processed. Multiple strip-shaped blind holes 45 are provided radially on the side wall of the locking clamp 4, which are used to further increase the elasticity of the locking clamp 4; the strip-shaped blind holes 45 are set with arc-shaped grooves near the center of the locking clamp 4 to prevent the locking clamp 4 from breaking when it deforms.

[0042] The diameter of the tailstock center 5 gradually decreases from front to back, which can clamp the workpiece to be processed and perform axial positioning. The front end of the tailstock center 5 abuts against the rear end of the workpiece to be processed, and the rear end is connected to the machine tool tailstock through a bearing. A limit ring 51 is provided on the outer wall of the tailstock center 5 to facilitate the disassembly of the tailstock center 5, and an L-shaped second through hole is provided at the rear end. Moving the machine tool tailstock will cause its tailstock center to press against the center hole of the workpiece to be processed, clamping the workpiece.

[0043] The specific working steps of this utility model based on the above-mentioned small short shaft forming grinding fixture are as follows:

[0044] 1. The front end of the front tip 2 is installed in the base 1, and the positioning piece 6 passes through the positioning hole 12 and abuts against the positioning groove to restrict the circumferential and axial displacement of the front tip 2.

[0045] 2】The drive clamp 3 is fitted onto the rear end of the front center 2, and the first locking bolt 35 is passed through the two sets of first locking holes 33 to lock the drive clamp 3 onto the rear end of the front center 2.

[0046] 3】The groove 41 on the locking clamp 4 is nested with the protrusion on the driving clamp 3, and the connecting piece passes through the threaded hole and abuts against the groove wall of the groove 41, thereby clamping the driving clamp 3 and the locking clamp 4; then the second locking bolt 43 passes through the second locking hole 42 to lock the front end of the part to be processed.

[0047] 4. Install the part to be processed between the rear end of the front center 2 and the front end of the tail center 5, and move the tailstock of the machine tool so that the tail center 5 and the front center 2 clamp the part to be processed, ensuring the coaxiality of the part to be processed.

[0048] 5. The machine tool spindle and tailstock rotate synchronously. The base 1 drives the front center 2, drive clamp 3, locking clamp 4, and the workpiece to rotate. At the same time, the tailstock drives the tail center 5 to rotate synchronously with the machine tool spindle. The external grinding wheel tool 7 is used to achieve the grinding tooth indexing requirements during the grinding process of the workpiece. After grinding, simply loosen the top bolt 32 on the protrusion 31 of the drive clamp 3, move the tail center 5 backward using the machine tool tailstock, remove the workpiece, loosen the second locking bolt 43 on the locking clamp 4, replace the workpiece with a new one, and then perform locking processing.

Claims

1. A small short shaft forming gear grinding fixture, characterized in that: It includes a coaxially arranged base (1), a front center (2), a drive clamp (3), a locking clamp (4), a tail center (5), and a positioning component (6); The base (1) is provided with an axial mounting hole (11), the front end of the base (1) is connected to the machine tool spindle, and the rear side wall is provided with a radial positioning hole (12) that is compatible with the positioning component (6), and the positioning hole (12) is connected to the mounting hole (11). The front end of the front center (2) is inserted into the mounting hole (11), and a positioning groove adapted to the positioning member (6) is provided at the position corresponding to the positioning hole (12) at the front end of the front center (2); the positioning member (6) passes through the positioning hole (12) and abuts against the positioning groove, thereby restricting the circumferential and axial displacement of the front center (2); the rear end of the front center (2) is used to abut against the front end of the part to be processed. The driving clamp (3) is a cylindrical structure, which is sleeved on the rear end of the front center (2), and the front end of the driving clamp (3) is used to lock the rear end of the front center (2). A protrusion (31) is provided on one side of the rear end of the driving clamp (3); the protrusion (31) is provided with a threaded hole along the width direction, and a tightening bolt (32) is provided in the threaded hole. The locking clamp (4) is a cylindrical structure, which is sleeved on the front end of the part to be processed. The side wall of the locking clamp (4) is provided with a groove (41) that runs through both ends of the protrusion (31). The width of the groove (41) is greater than the width of the protrusion (31), and the axial length of the groove (41) is greater than or equal to the axial length of the protrusion (31). The tightening bolt (32) passes through the threaded hole and abuts against the groove wall of the groove (41) to clamp the driving clamp (3) and the locking clamp (4). The front end of the tail tip (5) abuts against the rear end of the part to be processed, and the rear end is connected to the tailstock of the machine tool.

2. The small short shaft forming grinding fixture according to claim 1, characterized in that: The drive clamp (3) has multiple sets of first locking holes (33) tangentially arranged on its side wall, and a strip-shaped notch (34) penetrating its front end is arranged axially. The strip-shaped notch (34) is connected to the multiple sets of first locking holes (33) respectively. The entrance and exit of the first locking holes (33) are located on both sides of the strip-shaped notch (34). A first locking bolt (35) is provided in the first locking hole (33); the first locking bolt (35) passes through the first locking hole (33) to lock the rear end of the front tip (2).

3. The small short shaft forming grinding fixture according to claim 2, characterized in that: The drive clamp (3) has an arc-shaped notch (36) circumferentially provided on the side wall; The arc-shaped notch (36) is perpendicularly connected to the strip-shaped notch (34).

4. The small short shaft forming grinding fixture according to claim 3, characterized in that: The locking clamp (4) has a second locking hole (42) tangentially arranged on its side wall and a notch (44) radially arranged that communicates with the center of the locking clamp (4); the inlet and outlet of the second locking hole (42) are located on both sides of the notch (44); A second locking bolt (43) is provided in the second locking hole (42); the second locking bolt (43) passes through the second locking hole (42) to lock the front end of the part to be processed.

5. The small short shaft forming grinding fixture according to claim 4, characterized in that: The locking clamp (4) has multiple strip-shaped blind holes (45) extending radially through both ends on its side wall; the strip-shaped blind holes (45) are set as arc-shaped grooves near the center of the locking clamp (4).

6. The small short shaft forming grinding fixture according to claim 5, characterized in that: The front end of the front tip (2) is provided with a first through hole; The tail tip (5) has a second through hole at its rear end.

7. The small short shaft forming grinding fixture according to claim 6, characterized in that: The diameter of the front tip (2) gradually increases from front to back; The diameter of the tail tip (5) gradually decreases from front to back.

8. The small short shaft forming grinding fixture according to claim 7, characterized in that: A limit ring (51) is provided on the outer wall of the tail tip (5).

9. The small short shaft forming grinding fixture according to claim 8, characterized in that: The base (1) includes a first cylindrical segment (13), a second cylindrical segment (14), a conical segment (15), and a third cylindrical segment (16) that are coaxially connected from front to back; The diameter of the first cylindrical segment (13) is larger than the diameter of the second cylindrical segment (14); The diameter of the third cylindrical segment (16) is smaller than the diameter of the second cylindrical segment (14); The large end of the conical segment (15) is connected to the second cylindrical segment (14), and the small end is connected to the third cylindrical segment (16); The mounting hole (11) is a stepped hole. The large end of the stepped hole is adapted to the machine tool spindle and is located in the first cylindrical section (13) and the second cylindrical section (14). The small end is adapted to the front end of the front center (2) and is located in the second cylindrical section (14), the tapered section (15), and the third cylindrical section (16). The positioning hole (12) is radially disposed on the third cylindrical section (16).

10. The small short shaft forming grinding fixture according to claim 9, characterized in that: The first locking hole (33) is in two sets, and the two sets of first locking holes (33) are arranged along the axial direction; The front tip (2) is a Morse 5# cone.

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