Double-expansion-sleeve clamping fixture

Abstract

The utility model relates to the field of transmission part machining equipment, in particular to a double-expansion-sleeve clamping fixture which comprises a body, a support, a driving piece, a connecting sleeve, a reducing sleeve, expansion sleeves and an upper gland, the support is fixed in the body, and the support is matched with the non-machining end of a spline shaft key; the expansion sleeve is slidably arranged in the upper gland, and a positioning structure is arranged between the expansion sleeve and the upper gland; the outer side of the bottom of the expansion sleeve is matched with the conical surface of the connecting sleeve; the inner side of the bottom of the expansion sleeve is matched with the phi 60mm part of the spline shaft key; the outer side of the top of the expansion sleeve is matched with the conical surface of the upper gland, and the conical surface angle between the expansion sleeve and the upper gland is smaller than that between the expansion sleeve and the connecting sleeve; and the inner side of the top of the expansion sleeve is matched with the phi 40mm part of the spline shaft key. Under the condition that a machining center is not used, the position degree requirement can be met; in the machining process, the outer circle with the diameter phi being 40 mm and the outer circle with the diameter phi being 60 mm are clamped at the same time, under the condition that the rigidity of the clamp is improved, the measuring datum and the outer circle datum are unified, and the machining requirement that the position degree is 0.075 can be stably met.

Description

Technical Field

[0001] The utility model relates to the field of transmission part processing equipment, and specifically relates to a double-expansion sleeve clamping fixture. Background Art

[0002] In shaft parts of automotive transmissions and retarders, it is often necessary to drill or tap the shaft head, such as the second shaft of a 12-speed gearbox, the intermediate shaft, the retarder spline shaft, etc. At present, for shaft parts with relatively high positional tolerance in end face drilling of the same type, a probe is used to find the edge and then machining is carried out, which affects the machining cycle time.

[0003] Taking the retarder spline shaft as an example, such parts require positional tolerance between the hole and the outer circle. After heat treatment, the positional tolerance between the pin hole and the outer circle should be within 0.075. The original process plan is that due to the structure of the part itself, the φ40 outer circle datum cannot be used as the positioning surface, but the φ60 outer circle is used as the datum. However, due to micro-deformation during heat treatment and pre-heat runout problems, the 0.075 positional tolerance cannot be stably guaranteed. Due to unstable runout during repeated clamping, it is necessary to use a probe on the machining center to find the center before machining and then carry out machining again. However, due to the limited number of machine tools with probes, the machining of the φ4 hole and the M20 drilling and tapping processes cannot be combined. At the same time, the edge-finding time during machining is about 0.5 minutes, resulting in a long machining cycle time and high machining costs. Secondly, the outer circle of the existing fixture for machining is φ60, resulting in too long a cantilever depth during part machining, poor fixture rigidity, and low tool life. Summary of the Utility Model

[0004] Aiming at the problems of runout of the fixture datum position and poor rigidity in the prior art, the utility model provides a double-expansion sleeve clamping fixture, which can meet the positional tolerance requirements without using a machining center and at the same time combine the drilling process with the M20 drilling and tapping process.

[0005] The utility model is realized through the following technical solutions:

[0006] A double-expansion sleeve clamping fixture includes a body, a support, a driving member, a connecting sleeve, a reducing sleeve, an expansion sleeve, and an upper pressing cover. The upper pressing cover is detachably connected to the body and cooperates to form a hollow fixed cavity; the support is fixed in the body and cooperates with the non-machined end of the spline shaft; the expansion sleeve is slidably arranged in the upper pressing cover, and a positioning structure is arranged between the expansion sleeve and the upper pressing cover; the outer side of the bottom of the expansion sleeve is in tapered surface fit with the connecting sleeve, and the inner side of the bottom of the expansion sleeve is in fit with the φ60mm part of the spline shaft; the outer side of the top of the expansion sleeve is in tapered surface fit with the upper pressing cover, and the tapered surface angle between the expansion sleeve and the upper pressing cover is smaller than the tapered surface angle between the expansion sleeve and the connecting sleeve; the inner side of the top of the expansion sleeve is in fit with the φ40mm part of the spline shaft; the bottom of the body is connected to a hydraulic fixture, the connecting sleeve is connected to the driving member, and the input end of the driving member is connected to a hydraulic rod.

[0007] Preferably, the conical angle between the expansion sleeve and the upper gland is 10°, and the conical angle between the expansion sleeve and the connecting sleeve is 20°.

[0008] Preferably, a reducing sleeve is provided between the top of the expansion sleeve and the φ40mm part of the flower shaft key.

[0009] Preferably, the positioning structure includes a set screw, and a long hole is provided on the side wall of the expansion sleeve. The length axis of the long hole is parallel to the length axis of the expansion sleeve, and the set screw passes through the upper gland and extends into the long hole.

[0010] Preferably, a first bolt is provided between the support and the body, and the first bolt passes through the boss of the support and is threadedly connected to the bottom of the body.

[0011] Preferably, the driving member includes a pull rod and a transfer rod. The pull rod is located at the bottom of the body, and the lower end of the pull rod is connected to the hydraulic rod; the transfer rod includes a sliding sleeve and a sliding rod. The sliding sleeve is vertically fixed between the body and the support. One end of the sliding rod is fixed to the upper part of the pull rod, and the other end passes through the sliding sleeve and is fixedly connected to the bottom of the connecting sleeve. The sliding rod is slidably connected to the sliding sleeve.

[0012] Preferably, a plurality of transfer rods are provided, and the plurality of transfer rods are ground to the same height.

[0013] Preferably, the bottom of the body is connected to the hydraulic fixture through a flange, and the lower end of the pull rod passes through the flange and is connected to the hydraulic rod.

[0014] Preferably, a transfer plate is provided between the bottom of the body and the flange, and the transfer plate is fixedly connected to the bottom of the body through a second bolt.

[0015] Preferably, a plurality of lifting lug bolts are further provided on the outer side of the upper gland.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The double-expanding sleeve clamping fixture of the utility model can meet the position accuracy requirements without using a machining center by setting expanding sleeves and connecting sleeves with tapered surface fits, and at the same time combines the drilling process with the M20 drilling and tapping process. Meanwhile, during the machining process, the φ40mm outer diameter and the φ60mm outer diameter are clamped simultaneously. While improving the rigidity of the fixture, the measurement reference is unified with the outer diameter reference, and the machining requirement of a position accuracy of 0.075 can be stably met. When in use, the driving part pulls the connecting sleeve downward, the connecting sleeve drives the expanding sleeve to descend, and during the descending process of the expanding sleeve, it fits with the tapered surface of the upper upper pressure cover, causing the mouth of the expanding sleeve to contract, tightly holding the stepped sleeve, and then tightly holding the φ40mm outer diameter of the part. After the stepped sleeve tightly holds the outer diameter, the expanding sleeve can no longer move downward under the pulling force of the connecting sleeve, and the connecting surface between the expanding sleeve and the stepped sleeve is also a tapered surface. During the process of the connecting sleeve continuing to be pulled downward, the lower end of the expanding sleeve expands and tightens again. After tightly holding the φ60mm outer diameter, the lower port of the expanding sleeve cannot continue to move axially. The connecting sleeve cannot continue to move downward, and the tightening of the part is completed. The support is connected to the body, and axial positioning of the spline shaft can be performed.

[0018] Further, the adapter plate is used to ensure the coaxiality between the flange and the body. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the double-expanding sleeve clamping fixture of the utility model;

[0020] Figure 2 is a schematic diagram of the expanding sleeve in the double-expanding sleeve clamping fixture of the utility model;

[0021] Figure 3 is a schematic diagram of the stepped sleeve in the double-expanding sleeve clamping fixture of the utility model;

[0022] Figure 4 is a schematic diagram of the upper upper pressure cover in the double-expanding sleeve clamping fixture of the utility model;

[0023] Figure 5 is a schematic diagram of the connecting sleeve in the double-expanding sleeve clamping fixture of the utility model;

[0024] Figure 6 is a schematic diagram of the body in the double-expanding sleeve clamping fixture of the utility model;

[0025] Figure 7 is a schematic diagram of the support in the double-expanding sleeve clamping fixture of the utility model;

[0026] Figure 8 is a schematic diagram of the flange in the double-expanding sleeve clamping fixture of the utility model;

[0027] Figure 9 is a schematic diagram of the adapter plate in the double-expanding sleeve clamping fixture of the utility model;

[0028] Figure 10 It is a schematic diagram of the pull rod in a double-expansion sleeve clamping fixture of the present utility model;

[0029] Figure 11 It is a schematic diagram of the adapter rod in a double-expansion sleeve clamping fixture of the present utility model.

[0030] In the figure, 1. Expansion sleeve; 2. Reducing sleeve; 3. Upper gland; 4. Lifting eye bolt; 5. Set screw; 6. Connecting sleeve; 7. Body; 8. First bolt; 9. Support; 10. Second bolt; 11. Third bolt; 12. Flange; 13. Adapter plate; 14. Fourth bolt; 15. Pull rod; 16. Sliding sleeve; 17. Fixed bolt; 18. Sliding rod. Specific embodiments

[0031] The following further elaborates on the present utility model in conjunction with specific embodiments, which is an explanation rather than a limitation of the present utility model.

[0032] The present utility model discloses a double-expansion sleeve 1 clamping fixture. Referring to Figure 1 , it includes a body 7, a support 9, a driving member, a connecting sleeve 6, a reducing sleeve 2, an expansion sleeve 1 and an upper gland 3. The upper gland 3 and the body 7 are detachably connected and cooperate to form a hollow fixing cavity. In this embodiment, the upper gland 3 and the body 7 are connected by a fixed bolt 17, and it can also be other detachable connection methods such as a clamp or a pin shaft structure.

[0033] The support 9, the connecting sleeve 6 and the expansion sleeve 1 are arranged in the fixing cavity from bottom to top. The support 9 is fixed in the body 7 and cooperates with the non-machined end of the spline shaft to achieve the axial positioning of the spline shaft. In this embodiment, a first bolt 8 is arranged between the support 9 and the body 7, and the first bolt 8 passes through the boss of the support 9 and is threadedly connected to the bottom of the body 7. It can also be a pin shaft structure, etc.

[0034] The expansion sleeve 1 is slidably arranged in the upper gland 3, and a positioning structure is arranged between the expansion sleeve 1 and the upper gland 3. The positioning structure includes a set screw 5 and a long hole is formed on the side wall of the expansion sleeve 1. The length axis of the long hole is parallel to the length axis of the expansion sleeve 1. The set screw 5 passes through the upper gland 3 and extends into the long hole. The set screw 5 can ensure the position of the expansion sleeve 1 in the upper gland 3 and prevent the expansion sleeve 1 from detaching from the upper gland 3; one of the long holes can be used as a guiding structure when the expansion sleeve 1 slides, and the other is for making way to facilitate the up and down sliding of the expansion sleeve 1.

[0035] The outer side of the bottom of the expansion sleeve 1 is in conical fit with the connecting sleeve 6, the inner side of the bottom of the expansion sleeve 1 is in fit with the φ60mm part of the flower shaft key, a reducing sleeve 2 is arranged between the top of the expansion sleeve 1 and the φ40mm part of the flower shaft key, the inner side of the top of the expansion sleeve 1 is in fit with the φ40mm part of the flower shaft key, the outer side of the top of the expansion sleeve 1 is in conical fit with the upper pressing cover 3, and the conical angle between the expansion sleeve 1 and the upper pressing cover 3 is smaller than the conical angle between the expansion sleeve 1 and the connecting sleeve 6. In this embodiment, the conical angle between the expansion sleeve 1 and the upper pressing cover 3 is 10°, and the conical angle between the expansion sleeve 1 and the connecting sleeve 6 is 20°.

[0036] The connecting sleeve 6 is connected with the driving part, and the input end of the driving part is connected with the hydraulic rod. Among them, the driving part includes a pull rod 15 and a plurality of adapter rods. The pull rod 15 is located at the bottom of the body 7, the lower end of the pull rod 15 is connected with the hydraulic rod, and the plurality of adapter rods are ground to the same height. In this embodiment, six adapter rods are provided.

[0037] The adapter rod includes a sliding sleeve 16 and a sliding rod 18. The sliding sleeve 16 is vertically fixed between the body 7 and the support 9. One end of the sliding rod 18 is fixed to the upper part of the pull rod 15, and the other end passes through the sliding sleeve 16 and is fixed to the bottom of the connecting sleeve 6 through a threaded structure. The sliding rod 18 is slidably connected with the sliding sleeve 16.

[0038] The bottom of the body 7 is connected with the hydraulic fixture through a flange 12 and an adapter plate 13. The adapter plate 13 is located between the bottom of the body 7 and the flange 12. The adapter plate 13 is fixedly connected with the bottom of the body 7 through a second bolt 10. In this embodiment, the bottom of the body 7 and the flange 12 are connected through a second bolt 10, and the adapter plate 13 and the bottom of the body 7 are connected through a third bolt 11. In this embodiment, the cross section of the pull rod 15 is in an inverted T shape, and its structure includes a disc and a driving rod. An inverted T-shaped through hole is formed in the disc, and the through hole is matched with the bottom of the sliding rod 18. The disc is fixed between the adapter plate 13 and the bottom of the body 7, and the driving rod passes through the central hole of the adapter plate 13 and is connected with the hydraulic rod.

[0039] A plurality of lifting lug bolts 4 are further arranged on the outer side of the upper pressing cover 3. In this embodiment, two lifting lugs are provided and are oppositely arranged on the outer side of the upper pressing cover 3. The lifting lug bolts 4 are used to facilitate the lifting of the upper pressing cover 33 and the entire fixture.

[0040] The assembly process of a double-expansion sleeve clamping fixture of the present utility model is as follows:

[0041] (1) Fixture installation; install the fixture on the hydraulic fixture with a hydraulic base.

[0042] (2) Clamping parts; after clamping the parts, put on the reducing sleeve 2.

[0043] (3) Centering; use a dial indicator and a dial indicator stand to be installed on the tool to find the center of the part, and ensure that the initial machining position of the drill bit is concentric with the φ40mm outer circle within 0.01.

[0044] (4) Tool setting: Use the drill bit to find the coordinates of the end face of the part for tool setting.

[0045] (5) Prepare programs; prepare drilling and tapping programs.

[0046] (6) Trial cutting; start the program and drill holes.

[0047] When in use, the flange 12 is assembled with the hydraulic clamp, the pull rod 15 is connected with the hydraulic rod, and the pull rod 15 is connected with six adapter rods with the same height. The hydraulic rod pulls the pull rod 15 downward, and the pull rod 15 drives the sliding rod 18 of the adapter rod downward, so that the sliding rod 18 pulls the connecting sleeve 6 downward, and the connecting sleeve 6 and the expanding sleeve 1 pull the expanding sleeve 1 downward by the conical surface cooperation. During the process of the expanding sleeve 1 descending, due to the cooperation with the conical surface of the upper pressure cover 3, the top opening of the expanding sleeve 1 shrinks, and the reducing sleeve 2 is tightly held. The reducing sleeve 2 then holds the φ40mm outer circle of the part. After the reducing sleeve 2 holds the outer circle tightly, the expanding sleeve 1 can no longer move downward under the pulling force of the connecting sleeve 6, and the lower end of the expanding sleeve 1 is tightened to complete the clamping of the φ60mm outer circle during the process of the connecting sleeve 6 continuing to pull downward. The lower end of the expanding sleeve 1 cannot continue to move axially. Until the connecting sleeve 6 can no longer move downward, the tightening of the part is completed.

[0048] Since the conical surface of the expansion sleeve 1 and the upper pressure cover 3 is matched at 10°, and the conical surface of the expansion sleeve 1 and the connecting sleeve 6 is matched at 20°, during the downward movement of the expansion sleeve 1, the downward pulling force required for the expansion sleeve 1 to hold the reducing sleeve 2 is less than the pulling force required for the expansion sleeve 1 to hold the φ60mm outer circle. Therefore, during the downward movement of the connecting sleeve 6, the expansion sleeve is first moved downward to hold the reducing sleeve 1, then to hold the φ40mm outer circle, and then to hold the φ60mm outer circle.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and replacements, and these modifications and replacements are also within the scope of protection covered by the claims.

Claims

1. A double expansion sleeve clamping fixture, characterized in that: The invention comprises a body (7), a support (9), a driving member, a connecting sleeve (6), a reducing sleeve (2), an expanding sleeve (1) and an upper pressure cover (3), wherein the upper pressure cover (3) and the body (7) are detachably connected; the support (9) is fixed in the body (7), and the support (9) cooperates with the non-processed end of the spline key; the expanding sleeve (1) is slidably arranged in the upper pressure cover (3), and a positioning structure is arranged between the expanding sleeve (1) and the upper pressure cover (3); the outer side of the bottom of the expanding sleeve (1) cooperates with the conical surface of the connecting sleeve (6) The inner side of the bottom of the expansion sleeve (1) cooperates with the φ60 mm portion of the spline key; the outer side of the top of the expansion sleeve (1) cooperates with the conical surface of the upper pressure cover (3), and the conical surface angle between the expansion sleeve (1) and the upper pressure cover (3) is smaller than the conical surface angle between the expansion sleeve (1) and the connecting sleeve (6); the inner side of the top of the expansion sleeve (1) cooperates with the φ40 mm portion of the spline key; the bottom of the body (7) is connected to the hydraulic clamp, the connecting sleeve (6) is connected to the driving member, and the input end of the driving member is connected to the hydraulic rod.

2. The double expansion sleeve clamping fixture according to claim 1, characterized in that: The cone angle between the expansion sleeve (1) and the upper pressure cover (3) is 10°, and the cone angle between the expansion sleeve (1) and the connecting sleeve (6) is 20°.

3. The double expansion sleeve clamping fixture according to claim 1, characterized in that: A reducing sleeve (2) is arranged between the top of the expansion sleeve (1) and the φ40mm portion of the spline key.

4. The double expansion sleeve clamping fixture according to claim 1, characterized in that: The positioning structure includes a fixing bolt (5) and an elongated hole on the side wall of the expansion sleeve (1), the length axis of the elongated hole is parallel to the length axis of the expansion sleeve (1), and the fixing bolt (5) passes through the upper pressure cover (3) and extends into the elongated hole.

5. The double expansion sleeve clamping fixture according to claim 1, characterized in that: A first bolt (8) is arranged between the support (9) and the body (7), and the first bolt (8) passes through the boss of the support (9) and is threadedly connected to the bottom of the body (7).

6. The double expansion sleeve clamping fixture according to claim 1, characterized in that: The driving member includes a pull rod (15) and a transfer rod. The pull rod (15) is located at the bottom of the main body (7). The lower end of the pull rod (15) is connected to the hydraulic rod. The transfer rod includes a sliding sleeve (16) and a sliding rod (18). The sliding sleeve (16) is vertically fixed between the main body (7) and the support (9). One end of the sliding rod (18) is fixed to the upper part of the pull rod (15), and the other end passes through the sliding sleeve (16) and is fixedly connected to the bottom of the connecting sleeve (6). The sliding rod (18) is slidably connected to the sliding sleeve (16).

7. The double expansion sleeve clamping fixture according to claim 6, characterized in that: A plurality of transfer rods are provided, and the plurality of transfer rods are ground with the same height.

8. The double expansion sleeve clamping fixture according to claim 6, characterized in that: The bottom of the body (7) is connected to the hydraulic clamp via a flange (12), and the lower end of the pull rod (15) passes through the flange (12) and is connected to the hydraulic rod.

9. The double expansion sleeve clamping fixture according to claim 8, characterized in that: An adapter plate (13) is provided between the bottom of the body (7) and the flange (12), and the adapter plate (13) is fixedly connected to the bottom of the body (7) via a second bolt (10).

10. The double expansion sleeve clamping fixture according to claim 1, characterized in that: A plurality of lifting eye bolts (4) are also provided on the outer side of the upper gland (3).

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