Quick-change clamp for spline grinding shaft parts

Abstract

The utility model provides a quick-change clamp for spline grinding shaft parts, which is mainly used for solving the technical problems that the machining range is limited when the traditional spline grinding is used for machining light-weight and short-length gear parts, and the quick-change clamp for replacing bonding expansion sleeves with different diameters depends on a hydraulic system and is poor in stability. The utility model relates to a spline grinding shaft type part quick-change clamp which comprises a center shaft, an index plate clamping hoop and an expansion sleeve which are sequentially connected, the center shaft is sleeved with the index plate clamping hoop, the expansion sleeve is used for being installed on the outer circle of a workpiece to be machined, and the expansion sleeve is connected with the index plate clamping hoop. During production changing, the whole clamp does not need to be dismantled, only expansion sleeves with different diameters need to be replaced, the clamping range is large, and rapid production changing can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to quick change fixture, concretely relates to a spline grinding axle class spare quick change fixture, BACKGROUND

[0002] Gear is commonly used power transmission component, commonly used to realize force transmission in different motion directions, with the rapid development of the automobile industry, the demand of gear is also more and more big;In the production process of spline grinding of gear shaft, it is necessary to ensure the accurate movement and rotation of the gear in the machining process, so the positioning requirement of the gear is very strict;The following problems exist: the traditional spline grinding fixture has more accessories, the assembly relationship is complex, and the positioning accuracy after the wear of the accessory is difficult to guarantee;And the traditional spline grinding fixture is mainly used for machining light weight, short length gear parts, and the machining range is limited;

[0003] The Chinese patent with publication number CN221064698U discloses a forming gear grinding axle class spare quick change fixture, which comprises a connecting flange, a clamp, an adhesive expansion sleeve and a piston, the adhesive expansion sleeve can be driven to move axially reciprocatingly by the piston, the clamp is adapted to different sizes of parts by replacing adhesive expansion sleeves of different diameters;But its disadvantage is that the piston and the adhesive expansion sleeve are pushed by the hydraulic system, and if the hydraulic system fails, the normal work of the clamp may be affected. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the technical problem that the traditional spline grinding process is used for machining light weight, short length gear parts, and the machining range is limited, and the quick change fixture by replacing adhesive expansion sleeves of different diameters relies on the hydraulic system and has poor stability, and proposes a spline grinding axle class spare quick change fixture;

[0005] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0006] A spline grinding axle class spare quick change fixture, characterized in that: comprising top pin shaft, index plate clamp and expansion sleeve connected in sequence;

[0007] The top pin shaft comprises first connecting section, first extension section, second connecting section, second extension section and top pin connected coaxially in sequence;The first connecting section is used for connecting with the main shaft of external machine tool;The outer diameter of the first extension section is greater than the outer diameter of the first connecting section and the second connecting section;

[0008] The index plate clamp comprises mounting part, clamping part and knob connected in sequence;

[0009] The mounting part is cylindrical with an axially oriented mounting hole inside. The second connecting section passes through the mounting hole and is detachably connected to the mounting part. The mounting part has a first through-slit that runs through its inner and outer walls and both ends. The outer diameter of the first extension section is the same as the outer diameter of the mounting part.

[0010] The clamping part is hollow inside, and the second extension section is located inside the clamping part; a semi-circular groove with an outward opening is provided at the connection between the clamping part and the mounting part; the dial is located at the end of the clamping part away from the mounting part.

[0011] The expansion sleeve is annular and is used to be fitted onto the outer circle of the workpiece to be processed; a connecting groove is provided on the outer wall of the expansion sleeve, and the dial is installed in the connecting groove;

[0012] The expansion sleeve is provided with a second through-slit that runs through its inner and outer walls and both ends.

[0013] The tip is used to be installed inside the workpiece to be processed, and the tip's shaft head is a spherical head.

[0014] Furthermore, a rivet hole is provided axially inside the end of the first connecting segment away from the first extension segment for installing rivets.

[0015] Furthermore, the outer diameter of the second connecting section is 0.05 mm smaller than the inner diameter of the mounting section.

[0016] Furthermore, the tip is made of low-carbon steel and is fitted with a hard alloy replacement layer.

[0017] Furthermore, it also includes N first bolts, where N≥2 and is a positive integer;

[0018] The outer wall of the mounting part is provided with N first threaded holes and N first threaded hole pairs located on both sides of the first through-slit; the N first threaded holes and N first threaded hole pairs correspond one-to-one and are interconnected; the central axes of the corresponding first threaded holes and first threaded hole pairs coincide.

[0019] The first threaded hole is located at the port on the outer wall of the mounting part, and the first bolt is sequentially inserted into the first countersunk hole, the first threaded hole and the first threaded hole pair to tighten the mounting part and realize the detachable connection between the mounting part and the second connecting section.

[0020] Furthermore, the clamping part includes a conical section and a cylindrical section, the small end of the conical section is chamfered to the mounting part, and the large end is connected to the cylindrical section; the dial is disposed on the cylindrical section; the semi-circular groove is disposed on the outer wall of the conical section and is disposed near the small end;

[0021] The dial head has a screw hole on its side wall, and an adjusting screw is installed in the screw hole; the tail of the adjusting screw corresponds to the inner wall of one side of the connecting groove.

[0022] Furthermore, it also includes a second bolt;

[0023] The outer wall of the expansion sleeve is provided with a second threaded hole and a second threaded hole pair located on both sides of the second through-slit. The central axes of the second threaded hole and the second threaded hole pair coincide and are interconnected.

[0024] The second threaded hole is located at the port on the outer wall of the expansion sleeve, and the second bolt is sequentially inserted into the second countersunk hole, the second threaded hole, and the second threaded hole pair to tighten the expansion sleeve.

[0025] Furthermore, four evenly distributed semi-cut grooves are provided on the outer and inner walls of the expansion sleeve, and the depth of the semi-cut groove on the outer wall is greater than the depth of the semi-cut groove on the inner wall.

[0026] Furthermore, the tail of the adjusting screw is hemispherical.

[0027] Furthermore, the expansion sleeve is made of steel.

[0028] The beneficial effects of this utility model are:

[0029] 1. This utility model discloses a quick-change fixture for spline grinding shaft parts, comprising a center shaft, an indexing plate clamp, and an expansion sleeve connected in sequence. The indexing plate clamp is detachably fitted onto the center shaft, and the expansion sleeve is used to fit onto the outer wall of the workpiece to be processed. The expansion sleeve and the indexing plate clamp are detachably connected. When changing production, it is not necessary to disassemble the entire fixture set; only the expansion sleeve of different diameters needs to be replaced. It not only has a large clamping range but also enables rapid production changeover.

[0030] 2. This utility model provides a quick-change fixture for spline grinding shaft parts. The indexing plate clamp has a first through slot along the axial direction and a semi-circular groove with an outward opening along the radial direction. The expansion sleeve has a second through slot and multiple semi-cut-off grooves along the axial direction, all of which are used to reduce the deformation stress during clamping.

[0031] 3. This utility model discloses a quick-change fixture for spline grinding shaft parts. The dial head is adjustablely mounted in the connecting groove of the expansion sleeve via an adjusting screw, with the tail of the adjusting screw corresponding to the inner wall of one side of the connecting groove. By changing the relative position of the adjusting screw and the screw hole, the gap between the inner wall of the connecting groove and the outer side of the dial head is adjusted.

[0032] 4. This utility model provides a quick-change fixture for spline grinding shaft parts, which features simple structure, convenient operation, safety and reliability, and strong adaptability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an embodiment of a quick-change fixture for spline grinding shaft parts according to the present invention;

[0034] Figure 2 This is a cross-sectional view of an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model;

[0035] Figure 3 This is a schematic diagram of the top structure in an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model;

[0036] Figure 4 This is a schematic diagram of the indexing plate clamp in an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model;

[0037] Figure 5 This is a sectional view of the mounting portion in an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model;

[0038] Figure 6 This is a schematic diagram of the expansion sleeve in an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model;

[0039] Figure 7 This is a cross-sectional view of the expansion sleeve in an embodiment of a quick-change fixture for spline grinding shaft parts according to this utility model.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Center shaft; 11. Pull pin hole; 12. First connecting section; 13. First extension section; 14. Second connecting section; 15. Second extension section; 16. Ball head; 17. Carbide replacement layer;

[0042] 2. Indexing plate clamp; 21. Mounting part; 22. Mounting hole; 23. Conical section; 24. Cylindrical section; 25. Die head; 26. Screw hole; 27. Semicircular groove; 28. First through slot; 29. ​​First threaded hole; 20. First threaded hole pair;

[0043] 3. Expansion sleeve; 31. Second threaded hole; 32. Second through slot; 33. Connecting groove; 34. Semi-cut-off groove; 35. Second threaded hole pair;

[0044] 4. Workpiece to be processed; 5. First bolt; 6. Adjusting screw; 7. Second bolt. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0046] This utility model relates to a quick-change fixture for spline grinding shaft parts, such as... Figure 1 , Figure 2 As shown, it includes a center shaft 1, an indexing plate clamp 2, an expansion sleeve 3, and N first bolts 5 connected in sequence, where N ≥ 2 and is a positive integer; as well as an adjusting screw 6 and a second bolt 7; the indexing plate clamp 2 is sleeved on the center shaft 1, and the expansion sleeve 3 is sleeved on the outer circle of the workpiece 4 to be processed, and the expansion sleeve 3 is connected to the indexing plate clamp 2.

[0047] like Figure 3 As shown, the tip shaft 1 includes a first connecting segment 12, a first extension segment 13, a second connecting segment 14, a second extension segment 15, and a tip that are coaxially connected in sequence.

[0048] The first connecting section 12 is used to connect with the spindle of an external machine tool; the end of the first connecting section 12 away from the first extension section 13 has an axially oriented pull pin hole 11 for installing pull pins; the first connecting section 12 adopts a 7:24 taper, which is consistent with the taper surface of the BT50 tool holder, ensuring reliable connection and easy assembly and disassembly, reducing the difficulty of machining process and ensuring positioning stability; the outer diameter of the first extension section 13 is larger than the outer diameter of the first connecting section 12 and the second connecting section 14, ensuring that the center has sufficient rigidity.

[0049] The second connecting section 14 and the second extension section 15 pass through the interior of the indexing plate clamp 2. The center is used to install in the center of the workpiece 4 to be processed, and the taper of the center is matched with the taper of the center hole of the workpiece 4 to be processed. The shaft head of the center is a spherical head 16 to avoid puncturing the parts. The center is made of low carbon steel and is fitted with a carbide replacement layer 17 to increase the wear resistance and service life of the center. After wear, only the carbide replacement layer 17 needs to be replaced.

[0050] like Figure 4 As shown, the indexing plate clamp 2 includes a mounting part 21, a clamping part, and a dial head 25 connected in sequence. The mounting part 21 is cylindrical, with an axially oriented mounting hole 22 inside. A second connecting section 14 passes through the mounting hole 22 and is detachably connected to the mounting part 21. The outer diameter of the second connecting section 14 is 0.05 mm smaller than the inner diameter of the mounting part 21, and the outer diameter of the first extension section 13 is the same as the outer diameter of the mounting part 21. One end face of the mounting part 21 contacts one end face of the first extension section 13 to ensure axial dimension. A first through-slit 28 is provided on the mounting part 21, penetrating its inner and outer walls and both ends, to reduce deformation stress.

[0051] like Figure 4 , Figure 5 As shown, the outer wall of the mounting part 21 is provided with N first threaded holes 29 and N first threaded hole pairs 20 located on both sides of the first through-slit 28; the N first threaded holes 29 and N first threaded hole pairs 20 correspond one-to-one and are interconnected; the central axes of the corresponding first threaded holes 29 and first threaded hole pairs 20 coincide. One end of the first threaded hole 29 on the outer wall of the mounting part 21 is also provided with a first countersunk hole. A first bolt 5 is sequentially inserted into the first countersunk hole, the first threaded hole 29, and the first threaded hole pair 20. By tightening the first bolt 5, the mounting part 21 clamps the second connecting section 14, achieving a detachable connection between the mounting part 21 and the second connecting section 14. The first countersunk hole facilitates the concealment of the first bolt 5, avoiding interference with the machine tool during fixture rotation.

[0052] The clamping part is conical and hollow inside, comprising a conical section 23 and a cylindrical section 24. The small end of the conical section 23 is chamfered to the mounting part 21, and a semi-circular groove 27 is provided at the connection to reduce deformation stress; the semi-circular groove 27 is located near the small end; the large end is connected to the cylindrical section 24. The first through slot 28 and the semi-circular groove 27 help the mounting part 21 deform and clamp the center shaft 1 when the first bolt 5 is tightened. The second extension section 15 is located inside the conical section 23 and the cylindrical section 24; the dial 25 is located at one end of the cylindrical section 24.

[0053] like Figure 6 As shown, the expansion sleeve 3 is annular and made of steel, used to fit onto the outer circle of the workpiece 4 to be processed. The expansion sleeve 3 has a second through-slit 32 that extends through the inner and outer walls and both ends, facilitating deformation when the expansion sleeve 3 is clamped. A connecting groove 33 is provided on the outer wall of the expansion sleeve 3, and a dial 25 is installed within the connecting groove 33. The dial 25 has a screw hole 26 along the vertical axial direction, and an adjusting screw 6 is installed in the screw hole 26. The tail of the adjusting screw 6 is hemispherical, corresponding to one side of the inner wall of the connecting groove 33. By changing the relative position of the adjusting screw 6 and the screw hole 26, the length of the adjusting screw 6 is adjusted, thereby connecting or disassembling the expansion sleeve 3 and the dial 25.

[0054] like Figure 6 , Figure 7 As shown, the outer wall of the expansion sleeve 3 is provided with a second threaded hole 31 and a second threaded hole pair 35 located on both sides of the second through-slit 32. The central axes of the second threaded hole 31 and the second threaded hole pair 35 coincide and are interconnected. The second threaded hole 31 is provided with a second countersunk hole at the end on the outer wall of the expansion sleeve 3. The second bolt 7 is sequentially inserted into the second countersunk hole, the second threaded hole 31, and the second threaded hole pair 35 for tightening the expansion sleeve 3. In order to ensure uniform deformation when tightening with the second bolt 7, four evenly distributed semi-cut grooves 34 are provided on the outer wall and the inner wall of the expansion sleeve 3, and the depth of the semi-cut grooves 34 on the outer wall is greater than the depth of the semi-cut grooves 34 on the inner wall.

[0055] Work process:

[0056] A pull stud is installed at the pull stud hole 11, and the first connecting section 12 is inserted into the machine tool spindle. The second connecting section 14 and the second extension section 15 pass through the mounting part 21 and the clamping part. The first bolt 5 passes through the first countersunk hole, the first threaded hole 29, and the first threaded hole pair 20 in sequence. By tightening the first bolt 5, the mounting part 21 is fixed to the second connecting section 14. The expansion sleeve 3 is fitted onto the outer wall of the workpiece 4 to be processed. The second bolt 7 passes through the second countersunk hole, the second threaded hole 31, and the second threaded hole pair 35 in sequence. By tightening the second bolt 7, the expansion sleeve 3 is tightened and fixed on the outer circle of the workpiece 4 to be processed. Finally, the dial head 25 is installed in the connecting groove 33 of the expansion sleeve 3. By adjusting the screw 6, its tail end is pressed tightly against the inner wall of one side of the connecting groove 33. The machine tool spindle drives the center shaft 1 to rotate, and the indexing plate clamp 2 on the center shaft 1 drives the expansion sleeve 3 to rotate.

Claims

1. A quick-change fixture for spline grinding shaft parts, characterized in that: It includes a center shaft (1), an indexing plate clamp (2), and an expansion sleeve (3) connected in sequence; The center shaft (1) includes a first connecting section (12), a first extension section (13), a second connecting section (14), a second extension section (15), and a center that are coaxially connected in sequence; the first connecting section (12) is used to connect with the spindle of an external machine tool; the outer diameter of the first extension section (13) is larger than the outer diameter of the first connecting section (12) and the second connecting section (14); The indexing plate clamp (2) includes a mounting part (21), a clamping part, and a dial head (25) connected in sequence; The mounting part (21) is cylindrical, with an axially arranged mounting hole (22) inside. The second connecting section (14) passes through the mounting hole (22) and is detachably connected to the mounting part (21). The mounting part (21) has a first through slot (28) that passes through its inner and outer walls and both ends. The outer diameter of the first extension section (13) is the same as the outer diameter of the mounting part (21). The clamping part is hollow inside, and the second extension section (15) is located inside the clamping part; a semi-circular groove (27) with an outward opening is provided at the connection between the clamping part and the mounting part (21); the dial (25) is located at the end of the clamping part away from the mounting part (21); The expansion sleeve (3) is annular and is used to be fitted onto the outer circle of the workpiece (4) to be processed; a connecting groove (33) is provided on the outer wall of the expansion sleeve (3), and the dial (25) is installed in the connecting groove (33); The expansion sleeve (3) is provided with a second through-slit (32) that runs through its inner and outer walls and both ends; The tip is used to be installed inside the workpiece (4) to be processed, and the tip has a spherical head (16).

2. A quick-change fixture for spline grinding shaft parts according to claim 1, characterized in that: The first connecting segment (12) has a rivet hole (11) axially formed inside the end away from the first extension segment (13) for installing rivets.

3. A quick-change fixture for spline grinding shaft parts according to claim 2, characterized in that: The outer diameter of the second connecting section (14) is 0.05 mm smaller than the inner diameter of the mounting part (21).

4. A quick-change fixture for spline grinding shaft parts according to claim 3, characterized in that: The tip is made of low carbon steel and is fitted with a hard alloy replacement layer (17).

5. A quick-change fixture for spline grinding shaft parts according to claim 4, characterized in that: It also includes N first bolts (5), where N≥2 and is a positive integer; The outer wall of the mounting part (21) is provided with N first threaded holes (29) and N first threaded hole pairs (20) located on both sides of the first through-slit (28); the N first threaded holes (29) and the N first threaded hole pairs (20) correspond one-to-one and are interconnected; the central axes of the corresponding first threaded holes (29) and first threaded hole pairs (20) coincide. The first threaded hole (29) is provided with a first countersunk hole at the port on the outer wall of the mounting part (21). The first bolt (5) is sequentially inserted into the first countersunk hole, the first threaded hole (29) and the first threaded hole pair (20) to tighten the mounting part (21) and realize the detachable connection between the mounting part (21) and the second connecting section (14).

6. A quick-change fixture for spline grinding shaft parts according to claim 5, characterized in that: The clamping part includes a conical section (23) and a cylindrical section (24). The small end of the conical section (23) is connected to the mounting part (21) with a chamfer, and the large end is connected to the cylindrical section (24). The dial (25) is disposed on the cylindrical section (24). The semi-circular groove (27) is disposed on the outer wall of the conical section (23) and is disposed near the small end. The dial (25) has a screw hole (26) on its side wall, and an adjusting screw (6) is provided in the screw hole (26); the tail of the adjusting screw (6) corresponds to the inner wall of one side of the connecting groove (33).

7. A quick-change fixture for spline grinding shaft parts according to claim 6, characterized in that: It also includes the second bolt (7); The outer wall of the expansion sleeve (3) is provided with a second threaded hole (31) and a second threaded hole pair (35) located on both sides of the second through slot (32). The central axes of the second threaded hole (31) and the second threaded hole pair (35) coincide and are connected to each other. The second threaded hole (31) is located at the port on the outer wall of the expansion sleeve (3) and the second bolt (7) is sequentially inserted into the second countersunk hole, the second threaded hole (31) and the second threaded hole pair (35) to tighten the expansion sleeve (3).

8. A quick-change fixture for spline grinding shaft parts according to claim 7, characterized in that: The expansion sleeve (3) has four evenly distributed semi-cut grooves (34) on its outer and inner walls, and the depth of the semi-cut grooves (34) on the outer wall is greater than the depth of the semi-cut grooves (34) on the inner wall.

9. A quick-change fixture for spline grinding shaft parts according to claim 8, characterized in that: The tail of the adjusting screw (6) is hemispherical.

10. A quick-change fixture for spline grinding shaft parts according to claim 9, characterized in that: The expansion sleeve (3) is made of steel.

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