A spline sleeve single-tooth pulling fixture and use method thereof

Abstract

The present invention discloses a spline sleeve single-tooth pulling fixture, which includes an upper centering fixture and a lower centering fixture. The lower centering fixture is connected to the rotary table of the pulling machine as a whole. The lower section of the spline sleeve is arranged in the lower centering fixture. The upper centering fixture is sleeved on the upper section of the spline sleeve and is connected to the tool guide column as a whole. There is rolling friction between the upper centering fixture and the inner hole of the upper section of the spline sleeve. Among them, the upper centering fixture includes an upper centering clamp body, a directional key, a set screw, and a rolling friction component. The rolling friction component includes a plurality of rolling friction units; the upper centering clamp body is a hollow sleeve; the inner hole of the upper centering clamp body and the outer circle of the tool guide column have a small clearance fit, the lower small diameter outer circle and the inner hole of the upper part of the spline sleeve have a clearance fit, and a plurality of step holes are arranged on the lower end surface. The rolling friction unit is arranged in the step hole and has rolling friction with the inner hole of the upper part of the spline sleeve. The spline sleeve single-tooth pulling fixture of the present invention adopts rolling friction instead of sliding friction when indexing, which greatly improves production efficiency.

Description

Technical Field

[0001] The invention relates to the field of mechanical manufacturing, and in particular to a spline sleeve single-tooth pulling clamp and a use method thereof. Background Art

[0002] In mechanical processing, we often encounter the processing of internal splines with a relatively large length-to-diameter ratio. Since the stroke of the gear shaping machine is short, the wire cutting efficiency is low, and the large thickness precision is not high, the CNC single-tooth broaching machine is a more ideal internal spline processing equipment. The characteristic of the single-tooth broaching machine for processing spline sleeves is that after processing a tooth groove, the workpiece needs to rotate and index one tooth before processing the next tooth groove.

[0003] The structure of the existing spline sleeve single-tooth pulling fixture is as shown in the attached figure. Figure 5 , Attachment Figure 6 As shown, its disadvantages are: 1. The inner hole of the existing upper centering clamp body 24 is in clearance with the tool guide column 2, its outer circle is in clearance with the inner hole of the spline sleeve 17, and the lower outer circle of the spline sleeve 17 is in clearance with the existing lower centering clamp body 18, so the fixture positioning error is large and the processing accuracy is low; 2. The contact length between the lower outer circle of the spline sleeve 17 and the lower centering clamp body 18 is short and easy to shake, so the fixture positioning error is large and the system rigidity is poor; 3. The clamping ring 20 clamps the outer circle of the spline sleeve 17 through the screw 19, and then through The screw 21 and the clamping block 22 lock the lever 23, and the clamping force of the screw 19 is small, which makes the spline sleeve 17 easy to shake, so the processing accuracy of the fixture is low; Fourth, the spline sleeve 17 slides and rubs against the inner hole of the existing upper centering clamp body 24, so the medium and large spline sleeves cannot be directly indexed. When the spline sleeve needs to be indexed after processing one tooth, the upper centering fixture must be lifted, and the workpiece must be rotated one tooth before the upper centering fixture is loaded into the workpiece, which has low processing efficiency, and the matching surface of the existing upper centering fixture and the tool guide column 2 wears faster. In short, the existing spline sleeve single-tooth pulling fixture has a large positioning error and poor system rigidity. The spline sleeve will shake during processing, and the processing accuracy and efficiency are low. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a new type of spline sleeve single-tooth pulling clamp, which uses rolling friction instead of sliding friction during indexing, so that the rotation is flexible and the production efficiency is greatly improved. In addition, the spline sleeve single-tooth pulling clamp of the present invention is convenient and quick to clamp, has high positioning accuracy, good system rigidity, and high processing accuracy. At the same time, the present invention also provides a method for using the spline sleeve single-tooth pulling clamp.

[0005] The invention discloses a spline sleeve single-tooth pulling fixture, which comprises an upper centering fixture and a lower centering fixture. The lower centering fixture is connected to a rotary table of a pulling machine as a whole, the lower section of the spline sleeve is arranged in the lower centering fixture, the upper centering fixture is sleeved on the upper section of the spline sleeve and is connected to a tool guide column as a whole, and rolling friction is formed between the upper centering fixture and the inner hole of the upper section of the spline sleeve.

[0006] Furthermore, the upper centering clamp includes an upper centering clamp body, an directional key, a locking screw, and a rolling friction component, and the rolling friction component includes a plurality of rolling friction units; the upper centering clamp body is a hollow sleeve, and a notch is processed in its inner hole; the inner hole of the upper centering clamp body and the outer circle of the tool guide column have a small clearance fit, the lower small diameter outer circle and the inner hole of the upper part of the spline sleeve have a clearance fit, and a plurality of step holes are arranged on the lower end surface, and the rolling friction unit is arranged in the step hole and has rolling friction with the inner hole of the upper part of the spline sleeve; a keyway is arranged on the top of the upper centering clamp body, and the directional key is arranged in the keyway and cooperates with the keyway of the tool guide column and is locked by a locking screw.

[0007] Furthermore, each rolling friction unit includes a bearing and a stepped pin, and the stepped pin and the bearing are arranged in a step hole; the diameter of the large step hole of the upper centering clamp is slightly larger than the diameter of the bearing and intersects with its small diameter outer circle, the bearing is arranged in the large step hole, the stepped pin passes through the bearing and presses the bearing against the step surface of the step hole; the inner ring of the bearing cooperates with the small diameter section of the stepped pin, and its outer ring contacts the inner hole on the upper part of the spline sleeve to form rolling friction.

[0008] Furthermore, the step holes of the upper centering clamp are evenly distributed, and no step holes are arranged at the notch of the inner hole.

[0009] Furthermore, a portion of the large diameter outer circle of the stepped pin is cut into a straight edge, and the upper and lower sections thereof are respectively interference fit with the stepped small hole and the stepped large hole.

[0010] Furthermore, the upper centering clamp also includes a screw, and a transverse screw hole is arranged opposite to the notch of the inner hole of the upper centering clamp, and the screw is arranged in the transverse screw hole.

[0011] Furthermore, the lower centering clamp includes a lower centering clamp body, a lower tapered sleeve, a spring sleeve, an upper tapered sleeve, two handles, and a round nut; the lower centering clamp body is sleeve-shaped, and its lower flange stop cooperates with the inner hole of the rotary table of the pulling machine and is connected to the rotary table of the pulling machine through screws, and the lower inner hole of the lower centering clamp body is provided with a lower tapered sleeve, and the inner cone of the lower tapered sleeve cooperates with the lower outer cone of the spline sleeve; the upper inner hole of the lower centering clamp body is provided with an upper tapered sleeve and a spring sleeve from the outside to the inside, the upper tapered sleeve cooperates with the spring sleeve through the tapered surface, and the spring sleeve cooperates with the spline sleeve; the round nut is screwed onto the thread on the upper part of the lower centering clamp body, and the two handles are symmetrically arranged on the outer circumference of the round nut.

[0012] Furthermore, the outer cone on the upper part of the spring jacket matches with the inner cone of the upper cone sleeve, and the inner and outer surfaces of the lower cylinder respectively match with the outer circle of the spline sleeve and the clearance of the middle inner hole of the lower centering clamp.

[0013] Furthermore, a plurality of evenly distributed vertical grooves are arranged on the outer circle of the spring jacket.

[0014] The method for using the single-tooth drawing fixture of the spline sleeve of the present invention is as follows: 1. First, the lower centering fixture is installed on the rotary table of the broaching machine, and then the table seat is fixed on the tool guide column, the rotary table of the broaching machine is rotated to check the center of the lower centering fixture, and then the lower centering fixture is fixed on the rotary table of the broaching machine with screws, and then the spline sleeve is inserted into the lower centering fixture. Under the action of the deadweight of the spline sleeve, the lower outer cone of the spline sleeve and the inner cone of the lower cone sleeve are fitted, and the middle outer circle is fitted with the spring sleeve. Finally, the handle is turned to drive the round nut to move downward to realize the positioning of the spline sleeve by the spring sleeve. First, install the upper centering fixture into the tool guide column so that the bearing is on the spline sleeve, and then tighten the screw to fix the upper centering fixture on the tool guide column. Next, fix the table seat on the spline sleeve, adjust the moving table of the broaching machine, rotate the broaching machine rotary table to align, so that the distribution center of multiple bearings on the upper centering fixture coincides with the center of the broaching machine rotary table, and then loosen the screw to lower the upper centering fixture along the tool guide column to make the bearing contact with the inner hole on the upper part of the spline sleeve. Finally, tighten the screw to fix the upper centering fixture on the tool guide column to pull the teeth.

[0015] The advantages of the spline sleeve single-tooth pulling clamp of the present invention are: first, the upper centering clamp forms rolling friction through the bearing in the friction assembly and the inner hole of the spline sleeve workpiece. When the spline sleeve has processed one tooth, it can rotate relative to the upper centering clamp through rolling friction to complete the indexing, so as to process the next tooth; because the sliding friction can rotate flexibly, there is no need to lift the upper centering clamp even when processing a large spline sleeve, thereby improving the processing efficiency; second, the bearing accurately centers the inner hole of the upper part of the spline sleeve, so the positioning error of the clamp is small and the processing accuracy is high; third, the spring jacket in the lower centering clamp has a long contact length with the lower outer circle of the spline sleeve, so the positioning error of the clamp is small and the system rigidity is strong; the radial clamping of the spring jacket makes the clamping of the spline sleeve reliable and the processing accuracy is high; fourth, the lower cone sleeve in the lower centering clamp, the spring jacket and the bearing in the upper centering clamp make the spline sleeve single-tooth pulling clamp convenient and quick to clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a spline sleeve single-tooth pulling fixture of the present invention;

[0017] Figure 2 for Figure 1 A top view of

[0018] Figure 3 It is a structural schematic diagram of the upper centering fixture;

[0019] Figure 4 It is a structural schematic diagram of the lower centering fixture;

[0020] Figure 5 It is a structural schematic diagram of an existing spline sleeve single-tooth pulling fixture;

[0021] Figure 6 for Figure 5 Top view of the .

[0022] In the figure: 1. fixed worktable of broaching machine; 2. tool guide column; 3. rotary worktable of broaching machine; 4. screw; 5. lower centering clamp body; 6. lower taper sleeve; 7. spring clamp sleeve; 8. upper taper sleeve; 9. handle; 10. round nut; 11. stepped pin; 12. bearing; 13. screw; 14. upper centering clamp body; 15. directional key; 16. screw; 17. spline sleeve; 18. existing lower centering clamp body; 19. screw; 20. clamping ring; 21. screw; 22. clamping block; 23. lever; 24. existing upper centering clamp body. DETAILED DESCRIPTION

[0023] The present invention will be further described below through embodiments in conjunction with the accompanying drawings.

[0024] Example 1

[0025] from Figure 1 , Figure 2 , Figure 3 , Figure 4 It can be seen that the spline sleeve single-tooth pulling fixture of the present invention includes an upper centering fixture and a lower centering fixture. The lower centering fixture and the rotary table 3 of the pulling machine are connected as a whole. The lower section of the spline sleeve 17 is arranged in the lower centering fixture. The upper centering fixture is sleeved on the upper section of the spline sleeve 17 and is connected as a whole with the tool guide column 2. There is rolling friction between the upper centering fixture and the inner hole of the upper section of the spline sleeve 17.

[0026] After the spline sleeve 17 has processed one tooth, the spline sleeve 17 can rotate relative to the upper centering fixture through rolling friction to complete indexing, thereby processing the next tooth. Since rolling friction is used instead of sliding friction during indexing, the rotation is flexible, and even when processing a large spline sleeve, there is no need to lift the upper centering fixture, which improves processing efficiency and delays the wear of the mating surface of the upper centering fixture and the tool guide column 2.

[0027] Example 2

[0028] from Figure 1 , Figure 2 , Figure 3It can be known that the spline sleeve single-tooth pulling clamp of the present invention: the upper centering clamp includes an upper centering clamp body 14, an directional key 15, a locking screw 16, and a rolling friction component, and the rolling friction component includes a plurality of rolling friction units; the upper centering clamp body 14 is a hollow sleeve, and its inner hole is processed with a notch; the inner hole of the upper centering clamp body 14 and the outer circle of the tool guide column 2 have a small clearance fit, the lower small diameter outer circle and the inner hole of the upper part of the spline sleeve 17 have a clearance fit, and a plurality of step holes are arranged on the lower end surface, the rolling friction unit is arranged in the step hole, and has rolling friction with the inner hole of the upper part of the spline sleeve 17; a keyway is arranged on the top of the upper centering clamp body 14, and the directional key 15 is arranged in the keyway and matches the keyway of the tool guide column 2 and is locked by the locking screw 16.

[0029] The rolling friction unit is arranged in the stepped hole of the upper centering clamp body 14, and is in rolling friction with the inner hole of the spline sleeve 17; after processing one tooth, the spline sleeve 17 can be rotated relative to the upper centering clamp through the rolling friction unit to complete the indexing, so as to process the next tooth. Since rolling friction is used instead of sliding friction during indexing, the rotation is flexible, and there is no need to lift the upper centering clamp even when processing a large spline sleeve. Among them, the directional key 15 can prevent the upper centering clamp from rotating circumferentially, thereby ensuring the processing quality.

[0030] Example 3

[0031] from Figure 1 , Figure 2 , Figure 3 It can be known that the spline sleeve single-tooth pulling clamp of the present invention: each rolling friction unit includes a bearing 12 and a stepped pin 11, and the stepped pin 11 and the bearing 12 are arranged in a step hole; the diameter of the large step hole of the upper centering clamp body 14 is slightly larger than the diameter of the bearing 12 and intersects with its small diameter outer circle, the bearing 12 is arranged in the large step hole, the stepped pin 11 passes through the bearing 12 and presses the bearing 12 against the step surface of the step hole; the inner ring of the bearing 12 cooperates with the small diameter section of the stepped pin 11, and its outer ring contacts the inner hole on the upper part of the spline sleeve 17 to form rolling friction.

[0032] Among them, the step holes of the upper centering clamp body 14 are evenly distributed, and no step holes are set at the inner hole notch.

[0033] When the spline sleeve 17 is indexed, the broaching machine rotary table 3 drives the spline sleeve 17 to rotate through the lower centering fixture, and the rolling friction resistance between the inner hole of the upper part of the spline sleeve 17 and the bearing 12 is very small, so the indexing is easily completed. At the same time, the bearing 12 is in contact with the inner hole of the upper part of the spline sleeve 17, and the inner hole of the upper part of the spline sleeve 17 can be accurately centered relative to the clearance fit, so that the spline sleeve 17 and the tool guide column 2 are accurately positioned, so that the fixture positioning error is small and the processing accuracy is high.

[0034] Example 4

[0035] from Figure 1 , Figure 2 , Figure 3 It can be seen that in the spline sleeve single-tooth pulling clamp of the present invention: a part of the large-diameter outer circle of the stepped pin shaft 11 is cut into a straight edge, and its upper and lower sections are respectively interference-fitted with the stepped small hole and the stepped large hole.

[0036] In order to prevent the stepped pin 11 from interfering with the inner hole at the top of the spline sleeve 17 and affecting the indexing of the spline sleeve 17, the straight edge of the large diameter outer circle of the stepped pin 11 is directed toward the inner hole at the top of the spline sleeve 17. In this way, only the bearing 12 and the inner hole at the top of the spline sleeve 17 have rolling friction, thereby ensuring the indexing of the spline sleeve 17.

[0037] When the stepped hole space of the upper centering clamp body 14 is large, a larger bearing and a stepped pin with high rigidity can be selected, and the stepped pin does not need a large outer circle of the step, and the bearing can be cantilever supported.

[0038] Example 5

[0039] from Figure 1 , Figure 2 , Figure 3 It can be known that the spline sleeve single-tooth pulling clamp of the present invention: the upper centering clamp also includes a screw 13, and a transverse screw hole is arranged opposite to the inner hole notch of the upper centering clamp body 14, and the screw 13 is arranged in the transverse screw hole.

[0040] The locking screw 13 fixes the upper centering fixture and the tool guide column 2 relatively to prevent the tool guide column 2 from shaking relative to the upper centering fixture body 14 during processing, thereby ensuring processing accuracy.

[0041] Example 6

[0042] from Figure 1 , Figure 2 , Figure 4 It can be known that the spline sleeve single-tooth pulling clamp of the present invention: the lower centering clamp includes a lower centering clamp body 5, a lower tapered sleeve 6, a spring sleeve 7, an upper tapered sleeve 8, two handles 9, and a round nut 10; the lower centering clamp body 5 is sleeve-shaped, and its lower flange stop cooperates with the inner hole of the pull machine rotary table 3 and is connected to the pull machine rotary table 3 through a screw 4, and the lower inner hole of the lower centering clamp body 5 is provided with a lower tapered sleeve 6, and the inner cone of the lower tapered sleeve 6 cooperates with the lower outer cone of the spline sleeve 17; the upper inner hole of the lower centering clamp body 5 is provided with an upper tapered sleeve 8 and a spring sleeve 7 from the outside to the inside, and the upper tapered sleeve 8 cooperates with the spring sleeve 7 through the tapered surface, and the spring sleeve 7 cooperates with the spline sleeve 17; the round nut 10 is screwed on the thread on the upper part of the lower centering clamp body 5, and the two handles 9 are symmetrically arranged on the outer circumference of the round nut 10.

[0043] After the spline sleeve 17 is placed in the lower centering fixture, the lower outer circle of the spline sleeve 17 matches with the lower cone sleeve 6, and the middle outer circle matches with the spring jacket 7, so the spline sleeve 17 is reliably positioned. When the handle 9 turns the round nut 10 to lock, on the one hand, it drives the spring jacket 7 to move downward, and on the other hand, the upper cone sleeve 8 matches with the cone surface of the spring jacket 7 to compress the spring jacket 7 radially, thereby achieving the compression and precise positioning of the spline sleeve 17. Therefore, the fixture positioning error is small and the processing accuracy is high.

[0044] Example 7

[0045] from Figure 1 , Figure 2 , Figure 4 It can be seen that the spline sleeve single-tooth pulling clamp of the present invention: the outer cone on the upper part of the spring clamp sleeve 7 cooperates with the inner cone of the upper cone sleeve 8, and the inner and outer surfaces of the lower cylinder respectively cooperate with the outer circle of the spline sleeve 17 and the middle inner hole clearance of the lower centering clamp body 5.

[0046] The spring clip 7 ensures accurate positioning of the spline sleeve 17 by cooperating with the middle inner hole of the lower centering clamp body 5 and the outer circle of the spline sleeve 17. At the same time, the spline sleeve 17 can be pressed after the round nut 10 is locked.

[0047] The contact length between the spring jacket 7 and the lower outer circle of the spline sleeve 17 is long, which not only reduces the positioning error but also improves the rigidity of the clamping system; at the same time, the radial clamping of the spring jacket 7 makes the clamping of the spline sleeve 17 reliable, the spline sleeve 17 will not shake during the processing, and the processing accuracy is high.

[0048] The outer circumference of the spring jacket 7 is provided with a plurality of evenly distributed vertical grooves.

[0049] The spring clip 7 is provided with a vertical groove to make it more elastic, so that the spline sleeve 17 can be clamped better when the round nut 10 is locked.

[0050] Example 8

[0051] When using the spline sleeve single-tooth drawing fixture of the present invention: 1. First, install the lower centering fixture on the broaching machine rotary table 3, then fix the table seat on the tool guide column 2, rotate the broaching machine rotary table 3 to check the center of the lower centering fixture, then fix the lower centering fixture on the broaching machine rotary table 3 with a screw 4, and then install the spline sleeve 17 into the lower centering fixture. Under the deadweight of the spline sleeve 17, the lower outer cone of the spline sleeve 17 fits with the inner cone of the lower cone sleeve 6, and the middle outer circle fits with the spring jacket 7. Finally, the handle 9 is turned to drive the round nut 10 to move downward, so that the spring jacket 7 can position and clamp the spline sleeve 17; 2. 1. First, install the upper centering fixture into the tool guide column 2, so that the bearing 12 is on the spline sleeve 17, and then tighten the screw 13 to fix the upper centering fixture on the tool guide column 2. Then fix the table seat on the spline sleeve 17, adjust the broaching machine moving table 1, rotate the broaching machine rotary table 3 to check the table, so that the distribution center of multiple bearings 12 on the upper centering fixture coincides with the center of the broaching machine rotary table 3, and then loosen the screw 13 to make the upper centering fixture descend along the tool guide column 2, so that the bearing 12 and the inner hole of the upper part of the spline sleeve 17 are in contact, and finally tighten the screw 13 to fix the upper centering fixture on the tool guide column 2, and then the tooth can be pulled. After pulling a tooth, the rotating broaching machine rotary table 3 drives the spline sleeve 17 to rotate through the lower centering fixture, so as to easily complete the indexing and pull the next tooth. As can be seen from the above, the lower cone sleeve in the lower centering fixture, the spring sleeve and the bearing in the upper centering fixture make the spline sleeve single-tooth pulling fixture easy and quick to clamp.

[0052] The single-tooth pull fixture of the spline sleeve of the present invention adopts rolling friction instead of sliding friction when indexing, so it can rotate flexibly, and even if a large spline sleeve is processed, it is not necessary to lift the upper centering fixture, which greatly improves the production efficiency. At the same time, the spline sleeve can be connected to the rotary table through the lower centering fixture, the upper centering fixture and the tool guide column are connected to each other, and the upper centering fixture is accurately positioned through the bearing and the inner hole of the workpiece; therefore, the fixture has high positioning accuracy, good system rigidity, high processing accuracy of the spline sleeve, and convenient and quick clamping of the spline sleeve.

Claims

1. A spline sleeve single-tooth pulling fixture, characterized by: It comprises an upper centering fixture and a lower centering fixture. The lower centering fixture is connected to a rotary table (3) of a broaching machine as a whole. The lower section of a spline sleeve (17) is arranged in the lower centering fixture. The upper centering fixture is sleeved on the upper section of the spline sleeve (17) and is connected to a tool guide column (2) as a whole. There is rolling friction between the upper centering fixture and the inner hole of the upper section of the spline sleeve (17). The upper centering fixture comprises an upper centering fixture body (14), an orientation key (15), a set screw (16), and a rolling friction component. The rolling friction component comprises a plurality of rolling friction units. The upper centering fixture body (14) is a hollow sleeve, and a notch is processed in its inner hole. The inner hole of the upper centering fixture body (14) is provided with a plurality of rolling friction units. The tool guide column (2) has a small clearance fit with the outer circle, the lower small diameter outer circle has a clearance fit with the inner hole of the upper part of the spline sleeve (17), and the lower end surface is provided with a plurality of step holes, and the rolling friction unit is arranged in the step hole and has rolling friction with the inner hole of the upper part of the spline sleeve (17); the upper centering clamp body (14) is provided with a keyway, and the directional key (15) is arranged in the keyway and matches the keyway of the tool guide column (2) and is locked by a set screw (16); each rolling friction unit includes a bearing (12) and a stepped pin shaft (11), and the stepped pin shaft (11) and the bearing (12) are arranged in the step hole; the step of the upper centering clamp body (14) The diameter of the large hole is slightly larger than the diameter of the bearing (12) and intersects with its small diameter outer circle. The bearing (12) is arranged in the stepped large hole. The stepped pin shaft (11) passes through the bearing (12) and presses the bearing (12) against the stepped surface of the stepped hole. The inner ring of the bearing (12) cooperates with the small diameter section of the stepped pin shaft (11), and its outer ring contacts with the inner hole of the upper part of the spline sleeve (17) to form rolling friction. The lower centering fixture comprises a lower centering fixture body (5), a lower taper sleeve (6), a spring clamping sleeve (7), an upper taper sleeve (8), two handles (9), and a round nut (10). The lower centering fixture body (5) is sleeve-shaped, and its lower flange stop is connected to the return of the broaching machine. The inner hole of the rotary table (3) is matched and connected to the rotary table (3) of the broaching machine through a screw (4); the lower inner hole of the lower centering clamp body (5) is provided with a lower cone sleeve (6), and the inner cone of the lower cone sleeve (6) is matched with the lower outer cone of the spline sleeve (17); the upper inner hole of the lower centering clamp body (5) is provided with an upper cone sleeve (8) and a spring sleeve (7) from the outside to the inside; the upper cone sleeve (8) is matched with the spring sleeve (7) through a cone surface, and the spring sleeve (7) is matched with the spline sleeve (17); a round nut (10) is screwed on the thread on the upper part of the lower centering clamp body (5), and two handles (9) are symmetrically arranged on the outer circumference of the round nut (10).

2. The spline sleeve single-tooth pulling fixture according to claim 1 is characterized in that: The step holes of the upper centering clamp body (14) are evenly distributed, and no step holes are arranged at the inner hole notch.

3. The spline sleeve single-tooth pulling fixture according to claim 1 is characterized in that: A part of the outer circle of the large diameter of the stepped pin shaft (11) is cut into a straight edge, and the upper and lower sections thereof are respectively interference-fitted with the stepped small hole and the stepped large hole.

4. The spline sleeve single-tooth pulling fixture according to claim 1 is characterized in that: The upper centering clamp also includes a screw (13). A transverse screw hole is arranged opposite to the inner hole notch of the upper centering clamp body (14), and the screw (13) is arranged in the transverse screw hole.

5. The spline sleeve single-tooth pulling fixture according to claim 1 is characterized in that: The outer cone on the upper part of the spring clamp (7) matches with the inner cone of the upper cone sleeve (8), and the inner and outer surfaces of the lower cylinder respectively match with the outer circle of the spline sleeve (17) and the middle inner hole clearance of the lower centering clamp body (5).

6. The spline sleeve single-tooth pulling fixture according to claim 1, characterized in that: A plurality of evenly distributed vertical grooves are arranged on the outer circle of the spring clip (7).

7. The method for using the spline sleeve single-tooth pulling fixture according to any one of claims 1 to 6, characterized in that:

1. First, install the lower centering fixture on the rotary table (3) of the broaching machine, then fix the table seat on the tool guide column (2), rotate the broaching machine rotary table (3) to check the center of the lower centering fixture, then use the screw (4) to fix the lower centering fixture on the broaching machine rotary table (3), and then install the spline sleeve (17) into the lower centering fixture. Under the weight of the spline sleeve (17), the lower outer cone of the spline sleeve (17) fits with the inner cone of the lower cone sleeve (6), and the middle outer circle fits with the spring sleeve (7). Finally, by turning the handle (9), the round nut (10) is driven to move downward to achieve the positioning and clamping of the spring sleeve (7) on the spline sleeve (17); 2. First, install the upper centering fixture on the rotary table (3) of the broaching machine. Install the tool guide column (2) so that the bearing (12) is located on the spline sleeve (17), and then tighten the screw (13) to fix the upper centering fixture on the tool guide column (2). Then fix the table seat on the spline sleeve (17), adjust the movable table (1) of the broaching machine, rotate the broaching machine rotary table (3) to align the table, so that the distribution center of multiple bearings (12) on the upper centering fixture coincides with the center of the broaching machine rotary table (3), and then loosen the screw (13) to make the upper centering fixture descend along the tool guide column (2) so that the bearing (12) and the inner hole of the upper part of the spline sleeve (17) are in contact. Finally, tighten the screw (13) to fix the upper centering fixture on the tool guide column (2) to pull the teeth.

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