Injection Mold Acceptance Criteria- Part 3

January 17, 2022

5. Cooling and heating system

1) The cooling or heating system should be fully unblocked.

2) The seal should be reliable, the system should not leak under the pressure of 0.5MPa, and it is easy to check and repair.

3) The size and shape of the sealing groove opened on the mold base should meet the requirements of relevant standards.

4) Grease should be applied to the sealing ring when it is placed, and it should be higher than the surface of the mold base after it is placed.

5) Water and oil flow channel separators should be made of materials that are not easily corroded.

6) The front and rear molds should adopt a centralized water supply method.

6. Pouring system

1) The gate setting should not affect the appearance of the product and satisfy the product assembly.

2) The runner section and length should be designed reasonably, and the process should be shortened as much as possible under the premise of ensuring the forming quality, and the cross-sectional area should be reduced to shorten the filling and cooling time. At the same time, the plastic loss of the pouring system should be the least.

3) The partial cross-section of the three-plate mold runner at the back of the front mold plate should be trapezoidal or semicircular.

4) The three-plate mold has a material breaker on the gate plate, the diameter of the gate entrance should be less than 3mm, and the ball head has a 3mm deep step recessed into the gate plate.

5) The ball end pull rod should be reliably fixed, can be pressed under the positioning ring, can be fixed with headless screws, or can be pressed with a pressure plate.

6) Gates and runners should be machined according to the size requirements of the drawings, and manual grinding and polishing machines are not allowed.

7) The point gate should be in accordance with the requirements of the specification.

8) There should be an extension at the front end of the runner as a cold slug hole.

9) The Z-shaped inverted buckle of the pulling rod should have a smooth transition.

10) The runner on the parting surface should be round, and the front and rear molds should not be misaligned.

11) The latent gate on the ejector rod should have no surface shrinkage.

12) The diameter and depth of the cold material cavity of transparent products should meet the design standards.

13) The handle is easy to remove, there is no gate mark on the appearance of the product, and there is no residual handle at the product assembly.

14) For the curved hook latent gate, the two parts of the insert should be nitrided, and the surface hardness can reach HV700.

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