Machining tool for eccentric plastic part
By designing a machining fixture for eccentric plastic parts, and using structures such as fixed seats, screw caps, and cover plates to stabilize and constrain the parts, the problem of difficult machining of the inner holes of eccentric parts in medical devices was solved, and efficient and high-precision inner hole machining was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PARAGON MEDICAL DEVICE (CHANGZHOU) CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-28
AI Technical Summary
The inner holes of eccentric parts in medical devices are difficult to machine and have low precision, and existing tooling is difficult to effectively position and stabilize.
Design a tooling for machining eccentric plastic parts, including a fixed base and a screw cap. The part is stably confined within the cavity through structures such as a cavity, threaded connection, and cover plate. The threaded connection and cover plate ensure machining accuracy, and the part is fixed in conjunction with a counterspindle collet.
It improves the machining efficiency and accuracy of the inner hole of eccentric parts, ensures that the machining dimensions meet the drawing requirements, and makes clamping convenient and stable.
Smart Images
Figure CN224169937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of workpiece clamping device technology, and in particular to a machining fixture for eccentric plastic parts. Background Technology
[0002] Many medical devices contain eccentric parts with very small angular tolerances. Special tooling is required to position these parts to prevent deformation during manufacturing. Utility Model Content
[0003] To address the difficulty in machining the inner holes of eccentric parts in existing medical devices, this invention provides a machining fixture for eccentric plastic parts. By using an additional fixing seat and cover plate, the part is stably confined within the cavity, facilitating the machining of the inner hole while ensuring machining accuracy.
[0004] This utility model provides a machining fixture for an eccentric plastic part. The eccentric plastic part has a pre-drilled hole at one end and a wedge-shaped section at the other end. The machining fixture includes a fixed base and a screw cap. The fixed base has a cavity at its end to accommodate the eccentric plastic part. The screw cap is fixedly mounted at the end of the fixed base, confining the eccentric plastic part within the cavity. A machining hole is located at the center of the screw cap, eccentrically positioned to the pre-drilled hole on the eccentric plastic part. The part with the pre-drilled hole is placed into the cavity and fixed with the screw cap. The inner hole is then directly machined through the machining hole, making the operation convenient and achieving high machining accuracy.
[0005] Furthermore, the fixed seat is cylindrical, with a fixed end and a machining end. The fixed seat is fixed to the external counterspindle collet via the fixed end, and the cavity is located at the machining end. When machining the inner hole, the fixed seat can be directly clamped into the collet of the machining device for machining.
[0006] Furthermore, the diameter of the screw cap is larger than that of the fixed base. The machined end of the fixed base has external threads, and the screw cap has an internal threaded hole that matches the external threads, which communicates with the machined hole. The fixed base and the screw cap are connected by a threaded connection, and the locking position of the screw cap can be adjusted according to the length of the workpiece.
[0007] Furthermore, a limiting ring is provided on the fixed base, formed on the periphery of the fixed base, and positioned between the fixed end and the machining end. The limiting ring is used to limit the clamping position of the fixed base and the counterspindle collet, ensuring clamping stability.
[0008] Furthermore, the wedge-shaped section of the eccentric plastic part extends outside the cavity, and a cover plate is provided between the fixing seat and the screw cap. The cover plate abuts against the wedge-shaped section, and a clearance hole communicating with the machining hole is opened in the center of the cover plate. The cover plate further improves the stability of the part.
[0009] Furthermore, the machined end of the fixing base is provided with an insertion hole, and the cover plate is provided with a plug that matches the insertion hole. At least two sets of plugs and insertion holes are provided accordingly. The cover plate is pre-positioned by plugging, and then fixed by a screw-on nut.
[0010] Furthermore, an adapter sleeve is provided at the end of the screw cap furthest from the fixed base. The adapter sleeve is fixed to the screw cap by a plug-in connection. The center of the adapter sleeve has a square hole that is compatible with an external torque wrench, and the square hole communicates with the machining hole. The adapter sleeve is a torque wrench adapter sleeve, which is used to adjust the torque to control the deformation of the part.
[0011] Furthermore, the adapter sleeve is circumferentially provided with several limiting plates, and the screw cap is circumferentially provided with several limiting grooves that are adapted to the limiting plates. Through the circumferentially corresponding limiting plates and limiting grooves, the torque adapter sleeve can drive the screw sleeve to tighten, and the force is evenly distributed.
[0012] The beneficial effects of this utility model are as follows:
[0013] This utility model provides a machining fixture for eccentric plastic parts. The part to be processed is confined in the cavity by a fixed seat and a cover plate connected by threads, forming a whole. During processing, the fixed seat only needs to be placed into the secondary shaft collet for fixation, and the inner hole of the part can be processed. This not only makes the clamping of the part convenient, but also ensures that the dimensions of the processed part meet the requirements of the drawing. Attached Figure Description
[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 It is a drawing showing the machining requirements for the part;
[0016] Figure 2 This is an external schematic diagram of the machining tooling;
[0017] Figure 3 This is an internal schematic diagram of the machining tooling;
[0018] Figure 4 This is a first-angle exploded view;
[0019] Figure 5 This is a second-angle exploded view;
[0020] In the figure: 1. Fixed base, 11. Cavity, 12. Limiting ring, 13. Insertion hole, 2. Rotary cap, 21. Machining hole, 22. Limiting groove, 3. Eccentric plastic part, 31. Pre-drilled hole, 32. Wedge section, 4. Cover plate, 41. Clearance hole, 42. Insert block, 5. Adapter sleeve, 51. Square hole, 52. Limiting piece. Detailed Implementation
[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0022] like Figure 1 As shown, the eccentric plastic part 3 has a pre-drilled hole 31 at one end and a wedge-shaped section 32 at the other end. An eccentric inner hole communicating with the pre-drilled hole 31 needs to be drilled on the wedge-shaped section 32. The traditional machining method involves directly placing the plastic part into the counterspindle collet and then adjusting the machining angle of the drill spindle. Each part requires readjustment, which is cumbersome, inefficient, and results in poor machining accuracy. The counterspindle collet is a precision mechanical accessory used to clamp workpieces and is commonly used in high-precision machining equipment such as CNC lathes and Swiss-type lathes.
[0023] To facilitate the machining of the inner holes of eccentric parts in medical devices, a machining fixture for eccentric plastic parts is designed, such as... Figure 2 As shown, the machining fixture includes a fixed base 1 and a screw cap 2. The fixed base 1 has a cavity 11 at its end that can accommodate an eccentric plastic part 3. The screw cap 2 is fixedly installed at the end of the fixed base 1, so that the eccentric plastic part 3 is confined within the cavity 11. The screw cap 2 has a machining hole 21 at its center, which is eccentrically positioned with respect to the pre-drilled hole 31 on the eccentric plastic part 3. The pre-drilled hole 31 at the center of one end of the eccentric plastic part 3 is pre-machined. Then, the plastic part is placed into the cavity 11 of the fixed base 1 and the screw cap 2 is placed on it to fix it, so that the plastic part is stably placed in the fixed base 1. The inner hole is directly machined from the machining hole 21 to form an eccentric hole, thereby effectively improving machining efficiency and machining accuracy.
[0024] To facilitate use with the counterspindle collet, the fixing seat 1 is cylindrical, with a fixed end and a machining end. The fixing seat 1 is fixed to the external counterspindle collet via the fixed end, and the cavity 11 is formed at the machining end. After the plastic part is fixed, the fixed end of the fixing seat 1 is inserted into the counterspindle collet for clamping.
[0025] To ensure the clamping stability of the plastic parts, the diameter of the screw cap 2 is larger than that of the fixed base 1. The machined end of the fixed base 1 is provided with external threads, and the screw cap 2 is provided with an internal threaded hole that matches the external threads. The internal threaded hole communicates with the machined hole 21. The position of the screw cap 2 can be adjusted according to the specifications of the plastic parts, and the threaded connection provides good stability.
[0026] To ensure that the fixed seat 1 is properly clamped, a limit ring 12 is provided on the fixed seat 1. The limit ring 12 is formed on the periphery of the fixed seat 1 and is located between the fixed end and the machining end. The position of the limit ring 12 allows for a direct view of the length of the fixed seat 1 extending into the counterspindle collet, thus ensuring proper clamping.
[0027] like Figure 3 As shown, to further ensure the clamping stability of the plastic part, the wedge-shaped section 32 of the eccentric plastic part 3 extends out of the cavity 11. A cover plate 4 is provided between the fixing seat 1 and the screw cap 2. The cover plate 4 abuts against the wedge-shaped section 32, and a clearance hole 41 communicating with the machining hole 21 is opened in the center of the cover plate 4. An insertion hole 13 is opened on the machining end of the fixing seat 1, and an insertion block 42 adapted to the insertion hole 13 is provided on the cover plate 4. Two sets or three sets of insertion blocks 42 and insertion holes 13 are provided respectively. Two sets are symmetrically arranged, and three sets are circumferentially arranged. The plastic part is abutted in the cavity 11 by the cover plate 4 and then limited and fixed by the screw cap 2.
[0028] like Figure 4 and 5 As shown, to facilitate the adjustment of the torque of the screw cap 2, an adapter sleeve 5 is provided at the end of the screw cap 2 away from the fixed base 1. The adapter sleeve 5 is fixed to the screw cap 2 by a plug-in connection. The center of the adapter sleeve 5 is provided with a square hole 51 that is compatible with an external torque wrench. The square hole 51 communicates with the machining hole 21. Several limiting pieces 52 are provided circumferentially on the adapter sleeve 5, and several limiting grooves 22 that are compatible with the limiting pieces 52 are provided circumferentially on the screw cap 2. Placing the torque wrench in the square hole 51 allows for better adjustment of the torque of the screw cap 2, thereby controlling the deformation of the part through torque.
[0029] The above description is illustrative only and not restrictive of this utility model. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all such modifications, variations or equivalents will fall within the protection scope of this utility model.
Claims
1. A machining fixture for an eccentric plastic part, wherein the eccentric plastic part (3) has a pre-drilled hole (31) at one end and a wedge-shaped section (32) at the other end, characterized in that: The machining fixture includes a fixed base (1) and a screw cap (2). The fixed base (1) has a cavity (11) at its end that can accommodate the eccentric plastic part (3). The screw cap (2) is fixedly installed at the end of the fixed base (1) so that the eccentric plastic part (3) is confined in the cavity (11). The screw cap (2) has a machining hole (21) at its center. The machining hole (21) is eccentrically set with the pre-drilled hole (31) on the eccentric plastic part (3).
2. The machining fixture for an eccentric plastic part according to claim 1, characterized in that: The fixed seat (1) is cylindrical and has a fixed end and a machining end. The fixed seat (1) is fixed to the external secondary shaft clamp through the fixed end, and the cavity (11) is opened at the machining end.
3. The machining fixture for an eccentric plastic part according to claim 2, characterized in that: The diameter of the swivel cap (2) is larger than the diameter of the fixed seat (1). The outer periphery of the machining end of the fixed seat (1) is provided with an external thread. The swivel cap (2) is provided with an internal thread hole that is compatible with the external thread. The internal thread hole is connected to the machining hole (21).
4. The machining fixture for an eccentric plastic part according to claim 2, characterized in that: A limiting ring (12) is provided on the fixed base (1). The limiting ring (12) is formed on the periphery of the fixed base (1) and is located between the fixed end and the processing end.
5. The machining fixture for an eccentric plastic part according to claim 2, characterized in that: The wedge section (32) of the eccentric plastic part (3) extends out of the cavity (11). A cover plate (4) is provided between the fixed seat (1) and the swivel cap (2). The cover plate (4) abuts against the wedge section (32). An avoidance hole (41) communicating with the machining hole (21) is opened in the center of the cover plate (4).
6. The machining fixture for an eccentric plastic part according to claim 5, characterized in that: The fixed base (1) has a socket (13) on its processing end, and the cover plate (4) has a plug (42) that is compatible with the socket (13). There are at least two sets of plug (42) and socket (13) respectively.
7. The machining fixture for an eccentric plastic part according to claim 1, characterized in that: The end of the nut (2) away from the fixed base (1) is also provided with an adapter sleeve (5). The adapter sleeve (5) is fixed to the nut (2) by plugging. The center of the adapter sleeve (5) is provided with a square hole (51) that is compatible with an external torque wrench. The square hole (51) is connected to the machining hole (21).
8. The machining fixture for an eccentric plastic part according to claim 7, characterized in that: The adapter sleeve (5) has several limiting pieces (52) arranged around its circumference, and the rotating cap (2) has several limiting grooves (22) that are compatible with the limiting pieces (52) arranged around its circumference.