Injection Mold Acceptance Criteria- Part 4

January 19, 2022

7. Forming part, parting surface, exhaust groove

1) The surface of the front and rear molds should not have unevenness, pits, rust and other defects that affect the appearance.

2) The insert is matched with the mold frame, and there should be a clearance of less than 1mm around the round corners.

3) The parting surface is kept clean and tidy. There is no portable grinding wheel to avoid the air, and the sealing part has no dents.

4) The depth of the exhaust groove should be less than the overflow value of the plastic.

5) The research and distribution of inserts should be in place, with smooth placement and reliable positioning.

6) The inserts, inserts, etc. should be reliably positioned and fixed, the round pieces should be prevented from rotating, and there should be no copper or iron pads under the inserts.

7) The end face of the ejector rod is consistent with the core.

8) The forming part of the front and rear molds has no defects such as undercuts and chamfers.

9) The ribs should be pushed out smoothly.

10) For multi-cavity mold products, the left and right parts are symmetrical, and L or R should be indicated. If the customer has requirements for position and size, it should meet customer requirements. Generally, add it where it does not affect the appearance and assembly, and the font size is 1/8 .

11) The clamping surface of the mold base should be in place, and more than 75% of the area should be touched.

12) The ejector rod should be arranged near the side wall and beside the ribs and bosses, and a larger ejector rod should be used.

13) The numbers 1, 2, 3, etc. should be indicated for the same parts.

8. Injection molding production process

1)Within the range of normal injection molding process conditions, the mold should have the stability of injection molding production and the repeatability of process parameter adjustment.

2) The injection pressure during mold injection production should generally be less than 85% of the Injection Molding Machine's rated maximum injection pressure.

3) The injection speed during the injection molding production of the mold, the injection speed of the three-quarter stroke is not less than 10% of the rated maximum injection speed or more than 90% of the rated maximum injection speed.

4) The holding pressure during injection molding production should generally be less than 85% of the actual maximum injection pressure.

5) The clamping force during injection molding production should be less than 90% of the rated clamping force of the applicable model.

6) During the injection molding production process, the product and the nozzle material should be taken out easily and safely (the time is generally not more than 2 seconds each).

7) For molds with inserts, the inserts are easy to install and the inserts are fixed reliably during production.

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