Improvement strategies for the problem of unstable positioning accuracy of tooling fixtures
Published Time:
2026-08-19
Strictly abide by the principle of unification of benchmarks, keep the processing benchmarks, inspection benchmarks
1. Design level optimization
Strictly abide by the principle of unification of benchmarks, keep the processing benchmarks, inspection benchmarks, and drawing design benchmarks consistent, and eliminate benchmark misalignment errors.
Optimized positioning scheme: Prioritize the use of large-area plane + positioning pin combination to reduce single-point and slender positioning structures; avoid over-positioning and under-positioning.
Wear-resistant steel inserts and nitriding treatment are added to the positioning contact surface to improve wear resistance and slow down long-term wear and tear.
Add a fool-proof structure to prevent parts from being placed backwards and out of position, and eliminate artificial placement deviation in operation.
2. Fixture production and acceptance control
Improve the processing accuracy of the jig body, positioning pins, and positioning blocks, and strictly control the shape and position tolerances.
After the fixture is completed, the accuracy is re-tested, and the first piece and repeatability verification are performed to confirm that the repeat positioning accuracy reaches the standard before going online.
The positioning pins adopt a matching level with reasonable clearance. If the clearance is too large, it will easily shift, and if it is too small, it will be difficult to pick and place parts.
3. Daily management and control of on-site use
Establish regular cleaning specifications to promptly clean debris, dust, and burrs on the positioning surface to avoid foreign matter lifting the workpiece and causing deviation.
Develop a regular inspection plan: periodically check for loose positioning pins, worn positioning surfaces, loose screws, and replace inserts in a timely manner if the wear exceeds tolerance.
Standardize the loading and placement action, and prohibit violent collision with the positioning structure; avoid deformation of the fixture caused by the workpiece hitting the positioning block.
4. Process monitoring and exception handling
Use first article and inspections to continuously monitor key dimensional fluctuations, and prioritize the fixture positioning status once dimensional drift occurs.
If the size of the same batch is suddenly large or small, repeat it to verify whether it is intermittent positioning deviation, and distinguish whether it is a fixture problem or machine tool and raw material factors.
Establish jig maintenance history, record wear locations, replace parts, and continuously optimize the structure of easily worn parts.
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