Tension type gear groove milling clamp

Abstract

The utility model provides a tensioning type gear groove milling clamp and belongs to the field of gear machining device.The tensioning type gear groove milling clamp comprises a base and further comprises a first inner hexagon bolt and a second inner hexagon bolt, a positioning seat is fastened to the base through the second inner hexagon bolt, and a platform used for supporting the bottom end of a gear is fastened to the positioning seat through the second inner hexagon bolt; the positioning seat is sleeved with an expansion sleeve used for being matched with an inner hole of the gear, a shoulder nut is arranged above the expansion sleeve, the shoulder nut is in threaded connection with the upper end of the positioning seat, and the shoulder nut tightly presses the expansion sleeve above the platform. The groove milling clamp is simple and clear in principle, economical and practical, has obvious superiority in practicability and is very easy to popularize and use, the positioning accuracy of the gear and the tool can be improved to a great extent by using the clamp, and the situation that the positioning accuracy error of the gear and the tool is large due to the fact that the fit clearance between the inner hole of the gear and the tool is too large is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of gear processing devices, in particular to a tensioning type gear slot milling fixture. Background Art

[0002] The existing milling fixture uses the inner hole of the gear and the outer circle of the tooling for positioning. The upper and lower deviations of the inner hole of the gear will greatly affect the positioning accuracy, causing the symmetry of the end face groove of the processed product to be sometimes good and sometimes bad.

[0003] A transmission output shaft drilling and milling fixture is currently disclosed (patent application number: CN202021218358.9), which includes a clamping body, which is composed of a first connecting part, a second connecting part and a third connecting part; the first connecting part is connected to a positioning claw plate on a lathe, and the first connecting part is clamped by the positioning claw plate; a positioning bracket is detachably connected to the second connecting part, and an elastic and retractable positioning pin is installed on the positioning bracket, and the axis of the positioning pin is perpendicular to the axis of the clamping body, and the positioning pin and the drill bit on the lathe correspond to the same tooth groove; an expansion sleeve is sleeved on the third connecting part, and a pressure plate presses the expansion sleeve, and a through hole is provided on the pressure plate, and a hexagon socket screw passes through the through hole and is threadedly connected to the third connecting part, and the gear shaft sleeve is on the expansion sleeve.

[0004] The disclosed solution achieves the fixation of the gear shaft by the cooperation between the expansion sleeve and the conical surface of the third connecting part, so that the expansion sleeve expands outward and tightens the gear shaft. However, when positioning the gear shaft, the device needs to use a locating pin for positioning. After positioning, the locating pin needs to be reset before drilling can be performed. The operation is relatively complicated, and the tightening of the expansion sleeve is achieved by pushing the gear shaft. Therefore, the degree of tightening and limiting depends on the thrust. When the thrust is too large, it is difficult to remove after drilling. When the thrust is small, the limiting state is not good, and deviations are prone to occur during the drilling process. Utility Model Content

[0005] The present application provides a tensioning gear slot milling fixture, which aims to solve the problems that the positioning operation of the workpiece to be processed in the above-mentioned fixture is inconvenient, and the tensioning effect of the expansion sleeve is affected by the thrust, and there are defects when the thrust is too large or too small.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A tensioning gear slot milling fixture includes a base, a first hexagon socket bolt and a second hexagon socket bolt. The base is fastened with a positioning seat by the second hexagon socket bolt. The positioning seat is fastened with a platform for supporting the bottom end of the gear by the second hexagon socket bolt. The positioning seat sleeve is provided with an expansion sleeve for cooperating with the inner hole of the gear. A shoulder nut is provided above the expansion sleeve. The shoulder nut is threadedly connected to the upper end of the positioning seat. The shoulder nut presses the expansion sleeve above the platform.

[0008] Preferably, it also includes a pin, and the positioning seat includes an integrated column and a seat body, the expansion sleeve is sleeved on the outside of the column, the upper end of the column is threadedly connected to the shoulder nut, the column is provided with a radial hole, the expansion sleeve is provided with a radial through hole, the pin passes through the radial through hole and the radial hole, and limits the expansion sleeve.

[0009] Preferably, the seat body is provided with a first screw hole and a second screw hole, the platform is provided with a third screw hole and an axial through hole, the axis of the first screw hole coincides with the axis of the axial through hole, the axis of the second screw hole coincides with the axis of the third screw hole, the second hexagon socket bolt matches the first screw hole, and the first hexagon socket bolt matches the second screw hole and the third screw hole.

[0010] Preferably, a groove is provided at the bottom of the seat body, and a boss is provided at the upper end of the base, and the groove and the boss are clearance-matched.

[0011] Preferably, the number of the first screw holes and the number of the second screw holes are both at least three, and the at least three first screw holes and the second screw holes are equidistantly arranged.

[0012] Preferably, the number of the axial through holes is equal to the number of the first screw holes, and the number of the third screw holes is equal to the number of the second screw holes.

[0013] Preferably, the expansion sleeve head is provided with a number of expansion plates, U-shaped grooves are provided between adjacent expansion plates, and radial perforations are located below the expansion plates.

[0014] The utility model has the following beneficial effects:

[0015] (1) When positioning the gear to be processed, first put the gear on the expansion sleeve, make the lower end of the gear contact the platform, and then customize the rotation of the gear according to the milling groove requirements. After determining the position, you only need to tighten the shoulder nut with a socket wrench to complete the gear positioning, which is convenient to operate;

[0016] (2) When tightening the expansion sleeve, you only need to install the gear on the expansion sleeve first, and then tighten the shoulder nut with a socket wrench. As the shoulder nut rotates, the expansion plate on the expansion sleeve will radially spring open until it cannot be twisted. At this time, the expansion sleeve reaches the optimal tightening state and the gear is limited and fixed. After the gear is processed, you only need to rotate the shoulder nut in the opposite direction to reset the expansion sleeve, so that the gear can be easily removed from the expansion sleeve without scratching the inner wall, ensuring the quality of the gear. The method of tightening the expansion sleeve is simple, and there is no need to consider the situation where the workpiece is inconvenient to remove due to excessive force. By using a socket wrench, it does not require a lot of force to tighten the expansion sleeve, and the operation is easy;

[0017] (3) The principle of this slot milling fixture is simple and clear, economical and practical, and has obvious advantages in practicality. It is very easy to promote and use. By using this fixture, the positioning accuracy of the gear and the tooling can be greatly improved, avoiding the situation where the positioning accuracy error between the inner hole of the gear and the tooling is large due to the large clearance between the inner hole of the gear and the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a slot milling fixture equipped with a gear in the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the slot milling fixture in the utility model;

[0020] Figure 3 It is an exploded view of the slot milling fixture in the utility model;

[0021] Figure 4 It is a cross-sectional view of the slot milling fixture in the utility model;

[0022] Figure 5 It is a structural schematic diagram of the expansion sleeve in the utility model.

[0023] Among them, 1-shoulder nut, 2-expansion sleeve, 21-U-shaped groove, 22-expansion plate, 23-radial through hole, 3-platform, 31-third screw hole, 32-axial through hole, 4-positioning seat, 41-column, 411-radial socket, 42-seat body, 421-first screw hole, 422-second screw hole, 5-first hexagon socket bolt, 6-second hexagon socket bolt, 7-base, 8-pin, 9-gear. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figure 1-4 As shown, a tensioning gear milling fixture includes a base 7, a first hexagon socket bolt 5 and a second hexagon socket bolt 6. The base 7 is fastened with a positioning seat 4 through the second hexagon socket bolt 6. The positioning seat 4 is fastened with a platform 3 for supporting the bottom end of the gear 9 through the second hexagon socket bolt 6. The positioning seat 4 is provided with an expansion sleeve 2 for cooperating with the inner hole of the gear 9. A shoulder nut 1 is provided above the expansion sleeve 2. The shoulder nut 1 is threadedly connected to the upper end of the positioning seat 4. The shoulder nut 1 presses the expansion sleeve 2 onto the platform 3.

[0026] By driving the shoulder nut 1 to rotate with a socket wrench, the shoulder nut 1 continuously squeezes the expansion sleeve 2, causing the expansion sleeve 2 to continuously spring open radially, thereby tightening and clamping the inner wall of the gear 9 to be processed.

[0027] The expansion sleeve 2 can adopt an expansion sleeve of an existing structure, such as the expansion sleeve in the "transmission output shaft drilling and milling fixture" solution in the background technology, which can be directly applied to this solution.

[0028] like Figure 3 As shown, it also includes a pin 8, the positioning seat 4 includes an integrated column 41 and a seat body 42, the expansion sleeve 2 is sleeved on the outside of the column 41, the upper end of the column 41 is threadedly connected to the shoulder nut 1, the column 41 is provided with a radial hole 411, the expansion sleeve 2 is provided with a radial through hole 23, the pin 8 passes through the radial through hole 23 and the radial hole 411, and limits the expansion sleeve 2.

[0029] The latch pin 8 can be used to limit the expansion sleeve 2 to prevent it from rotating during the groove milling process, which would result in reduced machining accuracy.

[0030] like Figure 2-4 As shown, the seat body 42 is provided with a first screw hole 421 and a second screw hole 422, the platform 3 is provided with a third screw hole 31 and an axial through hole 32, the axis of the first screw hole 421 coincides with the axis of the axial through hole 32, the axis of the second screw hole 422 coincides with the axis of the third screw hole 31, the second hexagon socket bolt 6 matches the first screw hole 421, and the first hexagon socket bolt 5 matches the second screw hole 422 and the third screw hole 31.

[0031] The axial through hole 32 is only used for the second hexagon socket bolt 6 to pass through, and it is not connected to the second hexagon socket bolt 6. A screw hole is also provided at the corresponding position of the base 7. During assembly, the second hexagon socket bolt 6 passes through the axial through hole 32, and then extends into the first screw hole 421 and the screw hole at the corresponding position of the base 7, and is tightened to fix the positioning seat 4 and the base 7.

[0032] The first hexagon socket bolt 5 is tightened and fixed with the second screw hole 422 and the third screw hole 31 to fix the platform 3 and the positioning seat 4.

[0033] A groove is provided at the bottom of the seat body 42, and a boss is provided at the upper end of the base 7, and the groove and the boss are clearance-matched.

[0034] The number of the first screw holes 421 and the number of the second screw holes 422 are both three, and the three first screw holes 421 and the three second screw holes 422 are equidistantly arranged.

[0035] The first screw hole 421 and the second screw hole 422 are arranged one by one; the axial through hole 32 and the third screw hole 31 are also arranged in the same corresponding manner.

[0036] The number of the axial through holes 32 is equal to the number of the first screw holes 421 , and the number of the third screw holes 31 is equal to the number of the second screw holes 422 .

[0037] The working principle of this solution is: first assemble the groove milling fixture. At this time, the shoulder nut 1 is not tightened and only contacts with the expansion sleeve 2. Then the gear 9 to be processed is put on the expansion sleeve 2 and rotated to a suitable position. Then, the shoulder nut 1 is driven to rotate by a socket wrench to continuously squeeze the expansion sleeve 2, and finally the expansion sleeve 2 is tightened to fix the gear 9, and then the groove milling process is started.

[0038] Example 2

[0039] The difference between this embodiment and embodiment 1 is that: Figure 5 As shown, a number of expansion plates 22 are provided at the head of the expansion sleeve 2 , U-shaped grooves 21 are provided between adjacent expansion plates 22 , and radial through holes 23 are located below the expansion plates 22 .

[0040] In this embodiment, each expansion plate 22 is provided with a plurality of grooves. The structural design of the expansion plate 22 can increase the friction with the inner wall of the gear 9; the design of the U-shaped groove 21 can facilitate the radial rebound of the expansion plate 22 when it is squeezed.

[0041] Example 3

[0042] The difference between this embodiment and embodiment 1 is that:

[0043] like Figure 3 As shown, the number of the first screw holes 421 and the number of the second screw holes 422 are both four, and the number of the axial through holes 32 and the number of the third screw holes 31 are also four.

[0044] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A tensioning gear slot milling fixture, comprising a base (7), characterized in that: It also includes a first hexagon socket bolt (5) and a second hexagon socket bolt (6); the base (7) is fastened with a positioning seat (4) through the second hexagon socket bolt (6); the positioning seat (4) is fastened with a platform (3) for supporting the bottom end of the gear (9) through the second hexagon socket bolt (6); the positioning seat (4) is sleeved with an expansion sleeve (2) for matching with the inner hole of the gear (9); a shoulder nut (1) is provided above the expansion sleeve (2); the shoulder nut (1) is threadedly connected to the upper end of the positioning seat (4); the shoulder nut (1) presses the expansion sleeve (2) onto the platform (3).

2. The tensioning gear slot milling fixture according to claim 1, characterized in that: It also includes a latch (8), the positioning seat (4) includes an integrated column (41) and a seat body (42), the expansion sleeve (2) is sleeved on the outside of the column (41), the upper end of the column (41) is threadedly connected to the shoulder nut (1), the column (41) is provided with a radial insertion hole (411), the expansion sleeve (2) is provided with a radial through hole (23), the latch (8) passes through the radial through hole (23) and the radial insertion hole (411), and limits the expansion sleeve (2).

3. The tensioning gear slot milling fixture according to claim 2, characterized in that: The seat body (42) is provided with a first screw hole (421) and a second screw hole (422), the platform (3) is provided with a third screw hole (31) and an axial through hole (32), the axis of the first screw hole (421) coincides with the axis of the axial through hole (32), the axis of the second screw hole (422) coincides with the axis of the third screw hole (31), the second hexagon socket bolt (6) matches the first screw hole (421), and the first hexagon socket bolt (5) matches the second screw hole (422) and the third screw hole (31).

4. A tensioning gear slot milling fixture according to claim 2 or 3, characterized in that: The bottom of the seat body (42) is provided with a groove, and the upper end of the base (7) is provided with a boss, and the groove and the boss are clearance-matched.

5. The tensioning gear slot milling fixture according to claim 3, characterized in that: The number of the first screw holes (421) and the number of the second screw holes (422) are both at least three, and the first screw holes (421) and the second screw holes (422), which are at least three in number, are arranged at equal intervals.

6. The tensioning gear slot milling fixture according to claim 5, characterized in that: The number of the axial through holes (32) is equal to the number of the first screw holes (421), and the number of the third screw holes (31) is equal to the number of the second screw holes (422).

7. The tensioning gear slot milling fixture according to claim 2, characterized in that: The head of the expansion sleeve (2) is provided with a number of expansion plates (22), U-shaped grooves (21) are provided between adjacent expansion plates (22), and radial through holes (23) are located below the expansion plates (22).

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