A fixture for eccentric processing
By designing an eccentric processing fixture for automotive tightening wheels, the problems of low machining accuracy, easy damage to the inner and outer walls and long time in the prior art are solved, and high-precision eccentricity adjustment and processing quality improvement are achieved.
Patent Information
- Application Number
- CN202010694758.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-17
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2040-07-17
AI Technical Summary
When processing automobile tightening wheels, the prior art has problems such as low processing accuracy, easy damage to the inner and outer walls of the holes and long processing time, resulting in low production efficiency and high cost.
A clamp for eccentric processing is designed, including inner support clamp, inner support screw, connector, eccentric and limiting parts. Through the cooperation of inner support clamp and eccentric, the precise positioning and eccentricity of the tightening wheel blank is achieved. High precision adjustment of quantity.
The processing accuracy and quality of the tightening wheel is improved, processing time is shortened, production costs are reduced, and damage to the inner hole and outer wall is avoided.
Smart Images
Figure CN111730084B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of eccentric component processing, in particular to a clamp for eccentric processing. Background Art
[0002] Figure 1 The tensioner pulley 01 shown is for automobiles. The tensioner pulley 01 is mainly used to adjust the tightness of the automobile belt to prevent the belt from slipping or wearing too quickly, thereby extending the service life of the belt. Figure 1 The inner hole 011 and outer wall 012 of the tensioner 01 are eccentrically arranged. At present, when processing the tensioner 01, it is necessary to first clamp the blank with a fixture and use a lathe to machine the inner hole 011; then, according to the eccentricity between the inner hole 011 and the outer wall 012 and with the inner hole 011 as the reference, a radially eccentric fixture is made to clamp the blank, and the outer wall 012 of the tensioner is machined. The following problems exist when processing the tensioner in this way:
[0003] 1. The processing is divided into two steps, and the clamp needs to be clamped twice during processing, which leads to low processing accuracy and cannot guarantee the processing size of the tensioner, especially the processing accuracy of the eccentricity between the inner hole and the outer wall of the tensioner;
[0004] 2. During the processing, secondary clamping can easily cause scratches on the inner hole wall, affecting the subsequent finish treatment and further affecting the processing quality of the tensioner;
[0005] 3. The processing process is divided into two steps, which greatly increases the processing time cost, resulting in low processing efficiency and high production cost. Summary of the invention
[0006] In order to improve the processing accuracy, processing quality and production efficiency of the tensioner wheel and reduce the production cost, the inventor carefully studied the structure of the tensioner wheel blank to be processed and found that: the bottom of the tensioner wheel blank to be processed is provided with an inner support groove, and the outer wall of the inner support groove is provided with a clamping groove. Therefore, the present invention proposes an eccentric processing fixture, which includes an inner support clamp, an inner support screw, a connecting piece, an eccentric piece and a limiting piece. A connecting through hole is provided in the middle of the inner support clamp, an inner support convex ring and a positioning key are provided on the top of the inner support clamp, the inner support convex ring is concentric with the connecting through hole, the positioning key is located on the outside of the inner support convex ring, and a limiting protrusion is provided at the bottom of the inner support clamp; the inner support clamp is installed in the receiving groove on the top of the connecting piece, and the limiting protrusion is clamped on the connecting piece. In the limiting groove, the internal support screw is inserted into the connecting through hole and the screw hole at the bottom of the accommodating groove and is threadedly connected to the connecting piece; the eccentric piece is installed and fixed at the bottom of the connecting piece, and the central axis of the eccentric piece coincides with the central axis of the internal support screw, and two eccentric protrusions are symmetrically arranged at the bottom end of the eccentric piece, and the eccentric protrusions are inserted in the eccentric slot at the top of the limiting piece; on the limiting piece, both ends of the eccentric slot are respectively provided with eccentric flow channels connected to the eccentric slot.
[0007] When the eccentric processing fixture of the present invention is used to clamp the tension wheel blank to be processed, the inner support convex ring on the top of the inner support clamp can be inserted into the inner support groove on the tension wheel blank, and the positioning piece can be clamped in the clamping groove on the tension wheel blank to position the tension wheel blank to prevent the tension wheel blank from moving and misaligning on the inner support clamp; the limiting protrusion can be used to cooperate with the limiting groove to prevent the inner support clamp from relative displacement relative to the connecting piece during the processing. During the processing, after the inner hole or outer wall of the tension wheel is processed, the regulating gas or liquid can be injected into the eccentric clamping groove through the eccentric flow channel to adjust the position of the two eccentric protrusions in the eccentric piece in the eccentric clamping groove on the limiting piece, thereby adjusting the eccentricity between the inner hole and the outer wall of the tension wheel blank. It can be seen that after the eccentric processing fixture of the present invention is used to clamp the blank of the tension wheel to be processed, the adjusting gas or liquid is injected into the eccentric groove through the eccentric flow channel to adjust the positions of the two eccentric protrusions in the eccentric piece in the eccentric groove, and the adjustment accuracy is high, thereby ensuring the eccentricity accuracy between the inner hole and the outer wall of the tension wheel formed by the processing, thereby improving the processing accuracy; the inner hole and the outer wall on the blank of the tension wheel are processed by turning, and there is no need to perform secondary clamping on the blank of the tension wheel, which can avoid the inner hole wall or the outer wall of the tension wheel formed by the processing being damaged or scratched by the fixture, thereby improving the processing quality, shortening the processing time, improving the processing efficiency, and reducing the production cost.
[0008] Preferably, the inner support clamp is formed by docking at least two clamping blocks, the connecting through hole is set to an inverted cone-shaped hole near the top of the inner support clamp, the lower part of the inner support clamp is an inverted cone-shaped structure, and the receiving groove at the top of the connecting piece is an inverted cone-shaped groove. In this way, when using the eccentric processing fixture of the present invention, the tightness of the inner support screw can be adjusted as needed to loosen or clamp the blank of the tension wheel to be processed by the inner support clamp, which is simple and convenient to clamp the blank of the tension wheel, which can shorten the clamping time and improve the processing efficiency. Further, the limiting protrusion is a limiting column, and the limiting column is located on the side of the inverted cone-shaped structure at the lower part of the inner support clamp. In this way, the limiting column is directly inserted and clamped in the limiting groove, which can prevent the limiting protrusion from slipping out of the limiting groove when the inner support clamp is subjected to force, thereby affecting the processing. Further preferably, the central axis of the limiting column is parallel to the central axis of the connecting through hole. Such a limiting column is simple and convenient to process and position, which can reduce the processing cost of the inner support clamp.
[0009] Preferably, the eccentric piece is a symmetrical T-shaped structure, a guide groove is provided on the free end face of the eccentric protrusion of the eccentric piece, and a connecting guide groove is provided on the eccentric side face of the upper part of the eccentric piece parallel to the free end face of the eccentric protrusion. In this way, when in use, the guide groove and the connecting guide groove can be used to remove water and oil in the eccentric flow channel, so that the eccentric protrusion of the eccentric piece can reach the limit position, and the eccentric protrusion of the eccentric piece cannot be moved to the required eccentric position due to blockage, and even the eccentricity accuracy of the tensioning wheel formed by the processing cannot meet the processing requirements, affecting the processing quality of the tensioning wheel formed by the processing. Furthermore, the connecting guide groove and the guide groove are parallel to the centerline axis of the eccentric piece. In this way, the flow guiding performance of the guide groove and the connecting guide groove can be improved.
[0010] Preferably, the eccentric slot is a symmetrical inverted T-shaped slot. In this way, when in use, the position of the eccentric piece in the eccentric slot can be freely adjusted as needed, that is, the eccentricity between the inner hole and the outer wall of the tensioner to be processed can be adjusted, and the adjustment is simple and convenient.
[0011] Preferably, the limiting member includes a limiting seat and a limiting pressure block, the limiting seat includes a limiting base and a limiting clamping block, the limiting clamping block is fixed on the limiting seat, the limiting pressure block is pressed on the limiting base and is fitted and docked with the limiting clamping block on the side of the limiting clamping block. In this way, when assembling the eccentric processing fixture of the present invention, the limiting pressure block can be separated from the limiting clamping block on the limiting seat first, and then the eccentric member is inserted into the eccentric clamping groove, and finally the limiting pressure block is fitted and docked with the limiting clamping block, and the assembly is simple and convenient. Furthermore, the limiting pressure block and the limiting clamping block are docked and connected by at least two connecting bolts. In this way, the limiting pressure block and the limiting clamping block are connected by connecting bolts, which is simple to connect and convenient to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the eccentric processing fixture of the present invention in a use state;
[0013] Figure 2 for Figure 1 AA cross-sectional structure diagram in;
[0014] Figure 3 It is a structural schematic diagram of another angle of the eccentric processing fixture of the present invention in a use state;
[0015] Figure 4 for Figure 3 BB cross-sectional structure diagram in FIG.
[0016] Figure 5 It is a schematic diagram of the exploded structure of the eccentric processing fixture of the present invention;
[0017] Figure 6 The utility model relates to a fixture for eccentric processing of the present invention. DETAILED DESCRIPTION
[0018] Next, combine Figure 1-5 The eccentric processing jig of the present invention will be described in detail.
[0019] like Figure 1-5As shown, the eccentric processing fixture of the present invention includes an inner support clamp 1, an inner support screw 2, a connecting piece 3, a limiting piece 4 and an eccentric piece 5. Among them, a connecting through hole 101 is provided in the middle of the inner support clamp 1, an inner support convex ring 102 and a positioning key 103 are provided on the top of the inner support clamp 1, the inner support convex ring 12 is concentric with the connecting through hole 101, the positioning key 103 is located outside the inner support convex ring 102, and a limiting protrusion 104 is provided at the bottom of the inner support clamp 1. The inner support clamp 1 is installed in the receiving groove 31 at the top of the connecting piece 3, the limiting protrusion 104 is clamped in the limiting groove 32 on the connecting piece 3, and the inner support screw 2 is inserted in the connecting through hole 11 and the screw hole at the bottom of the receiving groove 31 and is threadedly connected with the connecting piece 3. Preferably, the inner support clamp 1 is formed by docking at least two clamping blocks 11, the connecting through hole 101 is set to an inverted cone-shaped hole near the top of the inner support clamp 1, the lower part of the inner support clamp 1 is an inverted cone-shaped structure, and the receiving groove 31 at the top of the connecting member 3 is an inverted cone-shaped groove. In this way, when using the eccentric processing fixture of the present invention, the tightness of the inner support screw 2 can be adjusted as needed to loosen or clamp the blank of the tension wheel 6 to be processed by the inner support clamp, and the clamping of the blank of the tension wheel 6 is simple and convenient, which can shorten the clamping time and improve the processing efficiency. Preferably, the limiting protrusion 104 is a limiting column, and the limiting column is located on the side of the inverted cone-shaped structure at the lower part of the inner support clamp 1. In this way, the limiting column as the limiting protrusion 104 is directly inserted and clamped in the limiting groove 32, which can prevent the limiting protrusion 104 from slipping out of the limiting groove 32 when the inner support clamp 1 is subjected to force, thereby affecting the processing. Preferably, the central axis of the limit column is parallel to the central axis of the connecting through hole 101. Such a limit column is simple and convenient to process and position, which can reduce the processing cost of the inner support clamp 1. Preferably, the screw head 21 of the inner support screw 2 is a conical table structure, and when the inner support screw 2 is tightened, the outer wall of the screw head 21 of the inner support screw 2 fits with the hole wall of the inverted conical table hole in the connecting through hole 101.
[0020] The top of the limiting member 4 is provided with an eccentric slot 401 for installing the eccentric member 5, and the two ends of the eccentric slot 401 are respectively provided with eccentric flow channels 402 connected to the eccentric slot 401. Preferably, the eccentric slot 401 is a symmetrical inverted T-shaped slot. In this way, when in use, the position of the eccentric member 5 in the eccentric slot 401 can be freely adjusted as needed, that is, the eccentricity between the inner hole 61 and the outer wall 62 of the tensioning wheel 6 to be processed can be adjusted, and the adjustment is simple and convenient. Preferably, the limiting member 4 includes a limiting seat 41 and a limiting pressure block 42, the limiting seat 41 includes a limiting base 411 and a limiting block 412, the limiting block 412 is fixed on the limiting base 411, and the limiting pressure block 42 is pressed on the limiting base 411 and is fitted and connected with the limiting block 412 on the side of the limiting block 412. In this way, when assembling the eccentric processing fixture of the present invention, the limiting pressure block 42 can be separated from the limiting clamping block 412 on the limiting seat 41, and then the eccentric member 5 can be inserted into the eccentric clamping groove 401, and finally the limiting pressure block 42 and the limiting clamping block 412 can be connected by fitting and docking, which is simple and convenient to assemble. Preferably, the limiting pressure block 42 and the limiting clamping block 412 are docked and connected by at least two connecting bolts (not shown in the figure). In this way, the limiting pressure block 42 and the limiting clamping block 412 are connected by connecting bolts, which is simple to connect and easy to disassemble and assemble.
[0021] The eccentric member 5 is fixedly mounted on the bottom of the connecting member 3, and the central axis of the eccentric member 5 coincides with the central axis of the inner support screw 2, and two eccentric protrusions 51 are symmetrically arranged at the bottom end of the eccentric member 5. Preferably, the eccentric member 5 is a symmetrical T-shaped structure, and a guide groove 511 is arranged on the free end face of the eccentric protrusion 51 of the eccentric member 5, and a connecting guide groove 521 is arranged on the eccentric side surface 52 of the upper part of the eccentric member 5 parallel to the free end face of the eccentric protrusion 51. In this way, when in use, the guide groove 511 and the connecting guide groove 521 can be used to remove water and oil in the eccentric flow channel, so that the eccentric protrusion 51 of the eccentric member 5 can reach the limit position, avoiding the eccentric protrusion 51 of the eccentric member 5 from being unable to move to the required eccentric position due to blockage, and even making the eccentricity accuracy of the tensioner formed by the processing unable to meet the processing requirements, affecting the processing quality of the tensioner formed by the processing. Preferably, the connecting guide groove 521 and the guide groove 511 are parallel to the center axis of the eccentric member 4. In this way, the guide performance of the guide groove 511 and the connecting guide groove 521 can be improved.
[0022] When the eccentric processing fixture of the present invention is used to clamp the blank of the tension wheel to be processed, the inner support convex ring on the top of the inner support clamp can be inserted into the inner support groove on the blank of the tension wheel and the positioning piece can be clamped in the clamping groove on the blank of the tension wheel to position the blank of the tension wheel and avoid the blank of the tension wheel from moving and misaligning on the inner support clamp; at the same time, since the inner support convex ring and the inner support groove are evenly fitted, the inner support force on the blank of the tension wheel can be evenly distributed, preventing the blank of the tension wheel from generating a large radial stress due to unbalanced force, and even causing the blank of the tension wheel to be deformed due to stress release after processing is completed, thereby improving the processing quality of the tension wheel; in addition, the limiting protrusion can be used in conjunction with the limiting groove to avoid relative displacement of the inner support clamp relative to the connecting piece during processing. During the processing, after the inner hole or outer wall of the tension wheel blank is processed, the position of the two eccentric protrusions in the eccentric piece in the eccentric slot on the limiter can be adjusted by injecting regulating gas or liquid into the eccentric slot through the eccentric flow channel, thereby adjusting the eccentricity between the inner hole and the outer wall of the tension wheel blank. It can be seen that after the eccentric processing fixture of the present invention is used to clamp the tension wheel blank to be processed, the position of the two eccentric protrusions in the eccentric slot can be adjusted by injecting regulating gas or liquid into the eccentric slot through the eccentric flow channel, thereby adjusting the accuracy of adjustment, thereby ensuring the eccentricity accuracy between the inner hole and the outer wall of the tension wheel formed by the processing, and improving the processing accuracy; the inner hole and the outer wall on the tension wheel blank are processed by turning, without the need for secondary clamping of the tension wheel blank, which can avoid the inner hole wall or the outer wall of the tension wheel formed by the processing being damaged or scratched by the fixture, thereby improving the processing quality, shortening the processing time, improving the processing efficiency, and reducing the production cost.
Claims
1. A fixture for eccentric processing, characterized in that: The eccentric processing fixture comprises an inner support clamp, an inner support screw, a connecting piece, an eccentric piece and a limiting piece, the middle part of the inner support clamp is provided with a connecting through hole, the top of the inner support clamp is provided with an inner support convex ring and a positioning key, the inner support convex ring is concentric with the connecting through hole, the positioning key is located on the outer side of the inner support convex ring, and the lower part of the inner support clamp is provided with a limiting protrusion; the inner support clamp is installed in the accommodating groove at the top of the connecting piece, the limiting protrusion is clamped in the limiting groove on the connecting piece, the inner support screw is inserted in the connecting through hole and the screw hole at the bottom of the accommodating groove and is threadedly connected to the connecting piece; the eccentric piece is installed and fixed at the bottom of the connecting piece, and the central axis of the eccentric piece coincides with the central axis of the inner support screw, the bottom end of the eccentric piece is symmetrically provided with two eccentric protrusions, and the eccentric protrusions are inserted in the eccentric clamping groove at the top of the limiting piece; on the limiting piece, two ends of the eccentric clamping groove are respectively provided with eccentric flow channels connected with the eccentric clamping groove; The inner support clip is formed by butting at least two clamping blocks, the connecting through hole is arranged near the top of the inner support clip as an inverted cone-shaped hole, the lower part of the inner support clip is an inverted cone-shaped structure, and the receiving groove at the top of the connecting piece is an inverted cone-shaped groove; The eccentric piece is a T-shaped structure, a guide groove is provided on the free end face of the eccentric protrusion of the eccentric piece, and a connecting guide groove is provided on the eccentric side face parallel to the free end face of the eccentric protrusion on the upper part of the eccentric piece; The eccentric slot is a symmetrical inverted T-shaped slot; The limiting member includes a limiting seat and a limiting pressure block, the limiting seat includes a limiting base and a limiting card block, the limiting card block is fixed on the limiting base, and the limiting pressure block is pressed on the limiting base and is fitted and docked with the limiting card block on the side of the limiting card block.
2. The eccentric processing fixture according to claim 1, characterized in that: The limiting protrusion is a limiting column, and the limiting column is located on the side of the inverted cone-shaped table-like structure at the lower part of the inner support clip.
3. The eccentric processing fixture according to claim 2, characterized in that: The central axis of the limiting column is parallel to the central axis of the connecting through hole.
4. The eccentric processing fixture according to any one of claims 1 to 3, characterized in that: The connecting guide groove and the guide groove are both parallel to the center line axis of the eccentric member.
5. The eccentric processing fixture according to any one of claims 1 to 3, characterized in that: The limiting pressure block and the limiting clamping block are butt-connected via at least two connecting bolts.
Citation Information
Patent Citations
Clamp for eccentric machining
CN213002708U