How to improve mold accuracy?

author: Universe plastic

2024-03-12

How to improve mold accuracy? It is mainly considered from two aspects: mold design and mold processing. In addition, the defects of some products themselves will also affect the accuracy of the mold.

Excellent design can improve mold accuracy

1. Conduct mold flow analysis in the early stage of the product to find the best product entry point to achieve glue entry balance. The clamping force is within the range of the injection molding machine and the product deformation is minimal.

2. For product splitting design, if it can be flat, don’t design a curved surface, and if it can be penetrated, don’t do penetration.

3. Product positioning design, three-level precision positioning: inner mold tiger mouth positioning, mold base guide post positioning, and edge locking position.

4. Product cooling design, the distance between the water transport and the product should be as consistent as possible, otherwise the product will be deformed due to uneven cooling.

5. Mold avoidance design, after reserving a certain sealing surface, avoid air on other surfaces, including both the front and rear molds, which not only improves processing accuracy, but also improves processing efficiency.

6. The fractal surface of the mold base is supported by a balance block to offset part of the PL surface locking surface to prevent the fractal surface of the inner mold from collapsing too quickly.

7. The support in the ejector plate is made of ball guide bushing or bronze plus graphite.

8. The depth of the cavity bottom of the B plate should be as thick as possible to avoid deformation of the injection molding template, and adding a support head will not have much effect.

9. Each part drawing indicates the processing tolerance.

Excellent processing can improve mold accuracy

1. The mold core is processed using high-end precision machines with an accuracy of 0.02μ.

2. It is best to form the mold core in one go to avoid repeated unloading of the machine, which may lead to errors in calibration every time.

3. Use slow wire cutting for mold core wire cutting.

4. Mold core inserts can be processed with a grinder without computer gongs, especially round inserts.

5. You cannot use a grinder to make flying molds, but go directly to the flying mold machine.

6. The accuracy of the mold base is controlled within 0.02mm, and the normal mold is more than 0.05mm.

7. Use three-dimensional full inspection of the electrical grade of the internal mold steel material. Better computer inspection can be done directly on the machine.

8. Electrical grade machining uses red copper instead of graphite. Graphite sparks quickly but is prone to damage, especially on thin steel.

Summarize

Mold accuracy requires a complete set of reasonable design and processing process control to be achieved. Problems in every link will have an impact on mold accuracy.

The design and processing cost of high-precision molds will be relatively high, but they are manufactured at the most competitive price in Universe Plastic Factory!

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