What acceptance criteria should a good set of molds meet? Is your mold good?
Today, I want to explain to you the acceptance criteria of mold products. We mainly analyze the appearance, size and material of the mold. Let's take a look.

1. mold appearance
1. Surface defects
The surface of the mold shall be free of defects: lack of material, scorching, top white, white lines, peaks, blistering, whitening (or cracking, breaking), baking marks, wrinkles, etc.

2. Weld mark
Generally, the length of circular perforation weld line is not more than 5mm, the length of special-shaped perforation weld line is less than 15mm, and the weld line strength shall pass the functional safety test.
3. Shrinkage
Shrinkage is not allowed in the obvious part of the appearance surface, and slight shrinkage is allowed in the inconspicuous part (no dent in hand feeling).
4. Pingdu
Generally, the plane flatness of small products is less than 0.3mm, and the assembly requirements shall be guaranteed if there are assembly requirements.

2. the dimensions of the mold
1. Accuracy
The geometric shape and dimensional accuracy of the mold products shall conform to the requirements of the formal and effective mold opening drawings (or 3D files). In addition, the tolerance range of the mold shall conform to relevant principles, such as the negative tolerance of the shaft dimension and the positive tolerance of the hole dimension. If the customer has special requirements, the mold manufacturer can also customize the production according to the actual situation.
2. Mold wall thickness
In general, the wall thickness of the mold is divided into two types: average wall thickness and non-average wall thickness. The non-average wall thickness should meet the requirements of the drawings, and according to the characteristics of the mold, the tolerance should be -0.1mm.
3. Matching degree
The surface shell and bottom shell of the mold should match, and the surface deviation should not be greater than 0.1mm. In addition, the holes, shafts, and surfaces of the mold products must meet the matching interval and use requirements, and no hand scraping can occur.
4. Nameplate
The words on the nameplate of the mold shall be clear, neatly arranged and complete; and the nameplate shall be fixed reliably and not easy to fall off.
5. Cooling water nozzle
The raw material of the mold cooling nozzle is plastic (as required by customers), which is made by counterbore processing technology. The counterbore diameter is generally 25mm,30mm and 35mm, and the chamfering direction of the orifice is all consistent. In addition, the installation position of the cooling nozzle should meet the relevant requirements, should not extend out of the surface of the mold base, and mark the import and export marks.
6. Ejacking hole and appearance
The ejection hole size and appearance size of the mold should meet the requirements of the injection molding machine. Except for small molds, you cannot use only one center ejection.
3. the material and hardness of the mold
1. Mold base material
The mold base should be selected to meet the requirements of the standard mold base, the material should have a certain ability to adapt to the environment.
2. Performance
The mold core, movable die insert, movable insert, shunt cone, push rod, sprue sleeve and other parts have good stability and corrosion resistance, and their material properties are higher than 40Cr.
3. Hardness
The hardness of the molded parts should not be lower than 50HRC, or the hardness of the surface hardening treatment should be higher than 600HV.

The above is all about the mold acceptance criteria, I hope to help you.