Auxiliary positioning device for clamping conversion process of double-action clamp

Abstract

The utility model discloses an auxiliary positioning device for a clamping conversion process of a double-action clamp. The auxiliary positioning device comprises a base, the supporting column is fixedly connected to the base, and a sliding way is formed in the middle of the supporting column in an axial penetrating mode. The floating connecting block can be inserted into the slide way of the supporting column in an axial sliding manner; the buffer spring is arranged in the slide way, one end of the buffer spring abuts against the bottom of the slide way, and the other end of the buffer spring abuts against the bottom of the floating connecting block so as to support the floating connecting block away from the bottom of the slide way; the end rest is fixedly connected to the upper end of the floating connecting block, and the end face of the end rest is parallel to the end face of the machined gear; and the positioning disc is arranged on the end rest, so that the positioning disc can extend into the inner hole of the gear in a sliding fit manner when the base is axially jacked. According to the scheme, the gear can be tightly propped against the double-action clamp before the reference of the gear is replaced, the inner hole of the gear is limited, the gear is prevented from moving after the outer circle clamp is loosened, the radial deformation of the gear is released after the outer circle clamp is loosened, and the deformation error during inner hole machining is eliminated.

Description

Technical Field

[0001] The utility model relates to a positioning device, in particular to an auxiliary positioning device for the clamping transformation process of a double-action fixture. Background Art

[0002] The gear ring is a gear fitting inside a hybrid transmission. As Figure 1 shown, such gear rings are usually of special-shaped and complex structures with thin walls, and are extremely prone to clamping deformation during post-heat turning processing, resulting in unqualified machining accuracy, and thus subsequent normal assembly cannot be carried out. The conventional machining process involves datum conversion, with many processes and low product qualification rate, and does not meet the mass production conditions. In order to avoid the occurrence of clamping deformation, we usually use a tooling with a double clamping method function (such as Figure 2 shown as the tooling for two clamping methods of clamping the pitch circle and rear pulling) for turning processing. When turning thin-walled and easily deformable positions such as the inner hole, the clamping method is changed from clamping the outer circle or pitch circle to rear pulling the end face, so that clamping deformation during inner hole machining can be eliminated and the inner hole machining accuracy can be guaranteed. However, during the datum conversion (during the process of changing the fixture clamping method from clamping the pitch circle or outer circle to rear pulling), in order to ensure that the gear can fully release the deformation caused by clamping before machining, it is necessary to first loosen the clamping jaw state on the outer circle of the gear, and then adopt the rear pulling type fixation. During this process, the workpiece will move, resulting in a reduction in the gear positioning accuracy after rear pulling fixation, affecting the concentricity between the shaft hole and the gear pitch circle processed subsequently.

[0003] Therefore, it is necessary to design an auxiliary positioning device that can solve the problem of inaccurate positioning caused by datum conversion during gear machining. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an auxiliary positioning device for the clamping transformation process of a double-action fixture to solve the problem of inaccurate positioning easily caused by datum change during gear machining.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An auxiliary positioning device for the clamping transformation process of a double-action fixture, comprising

[0007] a base;

[0008] a support column, fixedly connected to the base, and a slideway axially penetrating through the support column is provided;

[0009] a floating connection block, axially slidably inserted into the slideway of the support column;

[0010] A buffer spring is disposed in the slideway, with one end abutting against the bottom of the slideway and the other end abutting against the bottom of the floating connection block, so as to lift the bottom of the floating connection block to be disengaged from contact with the bottom of the slideway;

[0011] An end support is fixedly connected to the upper end of the floating connection block, and the end face of the end support is parallel to the end face of the processing gear;

[0012] A positioning disk is disposed on the end support so as to be able to slide and fit into the inner hole of the gear when axially jacking up the base.

[0013] Preferably, the positioning disk and the end support are detachably connected by bolts.

[0014] Preferably, the slideway is a stepped channel, and the caliber of the slideway near the base is larger than that of the end far from the base. The floating connection block is a stepped shaft, and the floating connection block can be slidably inserted into the slideway.

[0015] Preferably, an axially extending guide pin is fixedly inserted at the bottom of the slideway, and an axially extending guide channel A is provided at the bottom of the floating connection block, and the guide pin is slidably inserted into the guide channel A.

[0016] Preferably, an upwardly extending guide channel B is provided in the floating connection block, and the upper part of the buffer spring is placed in the guide channel B.

[0017] Preferably, at least one circle of oil grooves is provided around the outer surface of the floating connection block.

[0018] Preferably, a circle of grooves surrounding the outside of the floating connection block is provided on the end face of the support column facing the end support, and a sealing ring hoop-mounted on the outer surface of the floating connection block is installed in the grooves.

[0019] Preferably, a positioning pin is provided at the bottom of the base.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] Applying this solution to the reference conversion process in gear processing, especially in the reference conversion process when the gear end face is processed and then the gear inner hole is processed. At this time, after making the surface of the end support press against the end face of the gear and making the positioning disk slide into the gear inner hole, the double-action fixture can release the fixture clamped on the pitch circle or outer circle of the gear, so that the clamping deformation of the gear is released. Subsequently, the double-action fixture can complete the re-positioning and fixing of the gear by axially tightening the end face of the gear. It should be noted that through this solution, the problem of gear loosening and resulting misalignment during reference conversion in the gear processing process can be effectively solved, and the accuracy during subsequent gear shaft hole processing is effectively guaranteed. Brief Description of the Drawings

[0022] Figure 1 is a sectional view of the gear to be machined;

[0023] Figure 2 is a state diagram when the double-action fixture is used for fixing during gear machining;

[0024] Figure 3 is a state diagram when the present utility model performs auxiliary positioning on the gear when converting the positioning reference;

[0025] Figure 4 is a schematic structural diagram from another perspective when the present utility model performs auxiliary positioning on the gear when converting the positioning reference;

[0026] Figure 5 is a sectional view of the present utility model.

[0027] Reference Numerals: 1. positioning disc; 2. end rest; 3. sealing ring; 4. floating connection block, 41. guiding channel A, 42. oil groove, 43. guiding channel B; 5. buffer spring; 6. support column, 61. slideway; 7. guiding pin; 8. base; 9. positioning pin; 10. gear, 101. rear pulling end face, 102. inner hole, 103. positioning end face; 11. double-action fixture, 1101. outer circular clamping jaw, 1102. end pulling clamping jaw. Detailed Description of the Preferred Embodiments

[0028] Next, the technical solutions of the present utility model will be described clearly and completely with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] As Figures 1 to 5 shown, a double-action fixture clamping transformation process auxiliary positioning device includes a base 8 installed on a lifting table (not shown in the figure). A support column 6 is fixedly installed on the base by bolts. It should be noted that an axially penetrating slideway 61 is provided in the support column, and a floating connection block 4 is slidably inserted in the slideway so that the floating connection block can move up and down along the axis of the slideway. At the same time, an end support 2 is fixedly installed at the upper end of the floating connection block by bolts. The surface of the end support facing away from the base serves as a reference surface when positioning the gear. Before the conversion of the gear clamping reference, the end support is pushed against the end face of the gear after finish machining and fits with it under the drive of the rising base, so as to ensure that the gear can be stably pressed against the double-action fixture 11 after the outer circle clamping jaw 1101 is released subsequently. In order to further improve the accuracy of the gear auxiliary positioning after the outer circle clamping jaw is released, a positioning disk 1 is further installed on the upper part of the end support. It should be noted that the positioning disk is coaxial with the inner hole of the gear to be processed, and when the base is lifted, the positioning disk can be slidably inserted into the inner hole of the gear to ensure that the gear does not shift horizontally. In addition, in the above embodiment, if a rigid contact is adopted between the end support and the gear when the gear is tightened, the gear will inevitably be impacted and deformed. For this reason, this solution proposes to provide a buffer spring 5 in the slideway 61. One end of the buffer spring abuts against the bottom of the floating connection block, and the other end abuts against the bottom of the slideway to lift the floating connection block. Then when the base rises and moves a certain height, the end face of the end support 2 fits with the end face of the gear with a certain pressure to ensure that the gear does not move axially. It should be noted that during the rising process of the base, the buffer spring is compressed to prevent the end support from stamping and deforming the gear.

[0032] In addition, based on the above solution, the following optimizations can be made. Specifically, the positioning disk 1 and the end support 2 in this solution are a detachable structure connected by bolts. Then when the inner hole size of the gear changes, the matching positioning disk can be conveniently replaced.

[0033] In addition, it should also be noted that in this solution, to ensure the stability of the connection between the floating connection block and the support column 6, a stepped channel can be provided in the slideway of the support column 6. Specifically, the diameter of the slideway 61 near the base is larger, and the diameter of the section far from the base is smaller. The stepped holes are coaxially arranged. Correspondingly, the floating connection block 4 also adopts the form of a stepped shaft to ensure that the end with a larger diameter of the floating connection block cannot slide out from the channel with a smaller diameter of the slideway.

[0034] In addition, when positioning the gear, to prevent the positioning disk and the end support from rotating on their own, which may cause the gear to rotate and displace. A guide pin 7 extending along the axial direction of the slideway is fixedly inserted at the bottom of the slideway 61. At the same time, a guide channel A41 adapted to the guide pin 7 is provided at the bottom of the floating connection block 4. The guide pin is slidably inserted into the guide channel A. When the floating connection block moves axially, the guide pin slides in the guide channel A. It should be noted that through the cooperation between the guide pin and the guide channel A, the floating connection block can be prevented from rotating on its own during sliding.

[0035] It should also be noted that during the high-frequency scaling process of the buffer spring, irreversible side bending is inevitable. To prevent the spring from being distorted in the slideway after side bending and affecting normal operation. A guide channel B extending along the axial direction of the slideway is also provided in the floating connection block 4, and the upper half of the buffer spring is located in the guide channel B to ensure that the buffer spring can be compressed in the correct posture for a long time, thereby extending the service life of the spring.

[0036] In addition, at least one circle of oil grooves 42 is provided around the outer side surface of the floating connection block. Grease can be stored in the oil grooves to reduce the resistance and wear when the floating connection block slides in the slideway.

[0037] To prevent the grease from overflowing, a groove 62 surrounding the outside of the floating connection block 4 is provided on the end face of the support column facing the end support, and a sealing ring 3 is fixedly installed in the groove. The sealing ring can be a rubber sealing ring, which is hermetically clamped on the outer surface of the floating connection block to seal the grease on the surface of the floating connection block and prevent external dust and impurities from entering.

[0038] Finally, it should also be noted that to improve the matching accuracy between the base and the lifting platform, four positioning pins 9 are evenly distributed on the bottom surface of the base 8.

[0039] Working principle: After the end face of gear 10 is turned, start the lifting table to lift this solution towards the gear end face 102. When it is lifted to a certain height, the positioning disc 1 first enters into the inner hole 103 of the gear, that is, the radial free end of the gear is restricted and cannot move radially. Subsequently, this structure is continuously lifted until the end face of the end support 2 presses against the gear end face 102 with a certain pressure. At this time, the axial free end of the gear is also restricted and cannot move axially. After the above steps are completed, the outer edge jaws 1101 of the double-action fixture are loosened from the outer circle (or pitch circle) of the gear, and then the end pull jaws 1102 retract towards the gear and press against the rear pull end face 101 of the gear with a certain pressure, and the gear is immediately fixed at three points. When the gear is clamped and fixed by the end pull jaws, this solution can retract to the initial state. At this time, after the gear loses the radial clamping of the outer circle jaws, the radial deformation amount caused by the outer circle clamping is restored. When the inner hole of the gear is machined, there will be no error caused by radial deformation.

[0040] It should be noted that this solution effectively positions the gear before it is clamped by the end pull, avoiding the problem that the gear is prone to loosen and displace during the period when the outer circle jaws are loosened and the end pull jaws have not been clamped. It ensures the accuracy of positioning during the reference conversion process.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary positioning device for the clamping transformation process of a double-action fixture, characterized in that: including a base (8); a support column (6) fixedly connected to the base (8), and a slideway (61) axially penetrating through the support column (6); a floating connection block (4) axially slidably inserted into the slideway (61) of the support column (6); a buffer spring (5) disposed in the slideway (61), with one end abutted against the bottom of the slideway (61) and the other end abutted against the bottom of the floating connection block (4) to lift the bottom of the floating connection block (4) away from contact with the bottom of the slideway (61); an end rest (2) fixedly connected to the upper end of the floating connection block (4), and the end face of the end rest (2) being parallel to the end face of the processed gear; a positioning disk (1) disposed on the end rest (2) to slidably fit into the inner hole of the gear when the base (8) is axially lifted.

2. The auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 1, characterized in that: The positioning disk (1) and the end rest (2) are detachably connected by bolts.

3. The auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 2, characterized in that: The slideway (61) is a stepped channel, and the diameter of the slideway (61) at the end close to the base (8) is larger than that at the end far from the base (8). The floating connection block (4) is a stepped shaft and can be slidably inserted into the slideway (61).

4. The auxiliary positioning device for the clamping transformation process of a double-action fixture according to claim 3, characterized in that: An axially extending guide pin (7) is fixedly inserted at the bottom of the slideway (61). An axially extending guide channel A (41) is provided at the bottom of the floating connection block (4), and the guide pin (7) is slidably inserted into the guide channel A (41).

5. An auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 4, characterized in that: An upwardly extending guide channel B (43) is provided in the floating connection block (4), and the upper part of the buffer spring (5) is placed in the guide channel B (43).

6. The auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 5, characterized in that: At least one oil groove (42) is provided around the outer surface of the floating connection block (4).

7. The auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 6, characterized in that: A groove (62) surrounding the outside of the floating connection block (4) is provided on the end face of the support column (6) facing the end rest (2), and a sealing ring (3) hoop-mounted on the outer surface of the floating connection block (4) is installed in the groove (62).

8. The auxiliary positioning device for the clamping transformation process of a double-acting fixture according to claim 7, characterized in that: A positioning pin (9) is provided at the bottom of the base (8).

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