半圆形塑料件孔加工用专用夹具
By designing a special fixture and utilizing the cooperation between the cylinder and the positioning block, combined with the sliding connection of the dovetail groove and the locking bolt, the problem of uneven force distribution in the hole machining of semi-circular plastic parts was solved, achieving rapid positioning and high-precision machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU SHIJIN PRECISION MASCH CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-17
AI Technical Summary
Due to the special structure of semi-circular plastic parts, traditional fixtures can cause uneven stress during hole machining, resulting in large deformation of the parts and affecting machining accuracy and product quality.
A special clamp was designed, including a cylinder, a first positioning block, a second positioning block, and a quick clamp. The cylinder's arc surface fits against the inner wall of the plastic part, and the dovetail groove and locking bolt slide together to achieve lateral and longitudinal positioning and clamping of the semi-circular plastic part. The toggle linkage mechanism and spring are used to achieve quick clamping and high-precision positioning.
It enables rapid positioning and clamping of semi-circular plastic parts, reduces deformation, improves processing accuracy, and ensures product quality.
Smart Images
Figure CN224509872U_ABST
Abstract
Claims
1. A special fixture for machining a hole in a semicircular plastic piece, characterized in that, include: The cylindrical body (1) has an arc surface that matches the inner wall of the semi-circular plastic part; At least two first positioning blocks (2) are set on the arc surface of the cylinder (1); At least one pair of second positioning blocks (3) are symmetrically arranged on the arc surfaces at both ends of the cylinder (1); At least two pairs of quick clamps (4) are symmetrically arranged on the arc surfaces at both ends of the cylinder (1); When the semi-circular plastic part is placed on the cylinder (1), the first positioning block (2) and the second positioning block (3) position the semi-circular plastic part laterally and longitudinally, and each quick clamp (4) presses the semi-circular plastic part.
2. The special fixture for machining semi-circular holes in plastic parts as described in claim 1, characterized in that, The cylindrical body (1) has at least one pair of flat portions (11) on its arc surface; wherein The flat part (11) is provided with a dovetail groove (12). The second positioning block (3) is provided with a dovetail (31); The dovetail (31) is slidably connected to the dovetail groove (12); The second positioning block (3) is slidably connected to the flat part (11).
3. The special fixture for machining semi-circular holes in plastic parts as described in claim 2, characterized in that, The second positioning block (3) is provided with a locking bolt (5); wherein The locking bolt (5) is threadedly connected to the second positioning block (3); and The locking bolt (5) is adapted to abut against the dovetail groove (12) when tightened, so that the dovetail (31) abuts against the dovetail groove (12).
4. The special fixture for machining semi-circular holes in plastic parts as described in claim 3, characterized in that, The cylinder (1) is provided with fixed shafts (13) at both ends; wherein One end of the fixed shaft (13) is adapted to be connected to a motor; and The fixed shaft (13) at the other end is adapted to contact the ejector pin.
5. The special fixture for machining semi-circular holes in plastic parts as described in claim 4, characterized in that, The quick-release clamp (4) includes: a base (41) disposed on the arc surface of the cylinder (1), a clamping arm assembly (42) hinged to the base (41), a clamping head assembly (43) disposed on the clamping arm assembly (42), and an elbow linkage mechanism (44) hinged to the base (41); wherein The toggle linkage mechanism (44) includes: a handle (441); and The handle (441) is adapted to drive the toggle linkage mechanism (44) to rotate on the base (41) and press down the pressure arm assembly (42) when rotating. The pressure arm assembly (42) rotates on the base (41) and drives the pressure head assembly (43) to press the semi-circular plastic part.
6. The special fixture for machining semi-circular holes in plastic parts as described in claim 5, characterized in that, The base (41) is provided with a first hinge pin (411). The pressure arm assembly (42) includes: two symmetrically arranged pressure arms (421); wherein One end of each of the two pressure arms (421) is rotatably connected to the first hinge pin (411); The pressure head assembly (43) includes: stop blocks (431) symmetrically arranged on the upper and lower sides of the other end of the two pressure arms (421), adjusting bolts (432) passing through the two stop blocks (431), and two nuts (433) sleeved on the adjusting bolts (432); wherein The two nuts (433) are threadedly connected to the adjusting bolt (432); and The two nuts (433) are respectively located on the upper and lower sides of the two stops (431).
7. The special fixture for machining semi-circular holes in plastic parts as described in claim 6, characterized in that, The pressure head assembly (43) also includes a rubber head (434) disposed at the bottom of the adjusting bolt (432).
8. The special fixture for machining semi-circular holes in plastic parts as described in claim 7, characterized in that, The base (41) is provided with a second hinge pin (412). The pressure arm assembly (42) further includes: a third hinge pin (422) connected to the two pressure arms (421); wherein The handle (441) is rotatably connected to the third hinge pin (422); The handle (441) is provided with a through hole (4411). The toggle linkage mechanism (44) further includes: a connecting arm (442) rotatably connected to both ends of the second hinge pin (412), a fourth hinge pin (443) connected to the two connecting arms (442), two pressure blocks (444) rotatably connected to the fourth hinge pin (443), and a connecting shaft (445) disposed between the two pressure blocks (444); wherein The handle (441) is located between the two pressure blocks (444) and the connecting shaft (445); The fourth hinge pin (443) is located inside the through hole (4411); The two pressure blocks (444) are in contact with the corresponding pressure arms (421); and The handle (441) is adapted to drive the fourth hinge pin (443) to move when rotated. The fourth hinge pin (443) drives the pressure block (444) to move on the pressure arm (421) and press down on the pressure arm (421). At the same time, the connecting arm (442) rotates on the second hinge pin (412), and the pressure arm (421) rotates on the base (41) and drives the rubber head (434) on the adjusting bolt (432) to press the semi-circular plastic part.
9. The special fixture for machining semi-circular holes in plastic parts as described in claim 8, characterized in that, The pressure arm assembly (42) further includes a support shaft (423) disposed between the two pressure arms (421). The quick-release clamp (4) further includes: a spring (45); wherein The two ends of the spring (45) are connected to the support shaft (423) and the connecting shaft (445) respectively.