How to optimize the positioning solution to improve positioning accuracy?
Published Time:
2026-08-19
The design datum of part drawings, tooling positioning datum, and inspection datum should be consistent to eliminate datum misalignment errors.
1. Follow the principles of benchmark unification and benchmark overlap
The design datum of part drawings, tooling positioning datum, and inspection datum should be consistent to eliminate datum misalignment errors. Try to use the surface of the part with high precision and good rigidity as the main datum, and avoid using thin-walled and easily deformable curved surfaces for positioning.
2. Choose the positioning form reasonably to avoid under-positioning and over-positioning.
Under-positioning: The degree of freedom is insufficient, the workpiece is offset, and the positioning support must be supplemented;
Over-positioning: The same degree of freedom is repeatedly restricted by multiple constraints, which can easily cause the workpiece to warp and not be placed in place.
When over-positioning occurs, one of the locations can be changed to a floating support or elastic support to eliminate interference.
3. Optimize the positioning component structure
Priority is given to mature and stable positioning structures such as two pins on one side;
The positioning blocks and positioning pins are made of wear-resistant steel, and the surface is nitrided/quenched to slow down wear;
Control the matching gap between the positioning pin and the workpiece hole: if the gap is too large, it will be difficult to pick and place, and if the gap is too small, it will be difficult to pick and place. Choose an appropriate tolerance fit.
Positioning supports should be dispersed as much as possible to increase the support span and improve placement stability.
4. Improve the contact between the workpiece and the fixture
A chip groove is provided on the positioning surface to prevent iron filings and dust from accumulating and raising the workpiece;
Avoid narrow point positioning, give priority to surface contact or multi-point support, and reduce local pressure deformation;
Thin-walled and soft parts are equipped with floating supports to prevent deformation due to clamping pressure.
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