10 points to notice when manufacturing Plastic Injection Mold

1. The Parting line of the Plastic Injection Mold

Confirmed the parting line of the Plastic Injection Mold, design the strong ribs of the product as much as possible, and the structural direction of the buckle and the protrusion are consistent, to avoid core pulling, reduce the seam line and prolong the life of the plastic injection mold.

2. The direction of the Plastic Injection Mold opening

Confirmed the direction of the plastic injection mold opening, select the appropriate parting line, avoid undercuts in the plastic injection mold opening direction, and improve appearance and performance.

3. The appropriate demoulding slope

Design the appropriate demoulding slope, because the appropriate demolding slope can avoid the product from being topped injury. When we design the demoulding slope, the smooth demolding should be less than or equal to 0.5 degrees, and the surface of the fine skin should be greater than or equal to 1 degree, the rough texture surface is greater than 1.5 degrees. Secondly, when designing the structure of a deep cavity product, the slope of the surface should be greater than the slope of the inner surface to ensure that the mold core doesn’t deviate during plastic injection mold, to obtain a uniform product the wall thickness, ensures the material strength of the opening part.

4. The wall thickness of the product

The wall thickness of the product is generally between 0.5-4mm. If the wall thickness is greater than 4mm, the cooling time will be too long and the problem of shrinkage will occur. At this time, we need to consider changing the structure of the product (the uneven wall thickness will cause surface shrinkage, pores, and weld lines).

5. The thickness of the reinforcing rib

We need to pay attention to the thickness of the reinforcing rib is less than or equal to the thickness of the product, and the range is between 0.5 and 0.7. Otherwise, the surface will shrink, and the slope of the reinforcing rib should be greater than 1.5 degrees to avoid top injury (Reasonable application of the reinforcing rib can increase the rigidity of the product and reduce deformation).

6. Setting reasonable fillet

Setting reasonable fillet. If the fillet is too small, it may cause a concentration of product stress and mold cavity stress, resulting in breaking the product and Injection Mold Cavity. Different fillets may cause the movement of the parting line, which should be combined with the actual situation, choosing the different rounded or clear corners.

7. Setting seasonable the shape of the hole

When we design the shape of the hole, generally pay attention to the following points.

1. When designing, the shape of the hole is generally round to ensure that the axial direction of the hole is consistent with the direction of the mold opening.

2. The length-diameter ratio of blind holes is generally not more than 4.

3. The distance between the hole and the edge of the product is generally greater than the aperture ruler.

4. When the aspect ratio of the hole is greater than 2, the drafting slope should be set (it should be noted that the diameter of the hole is calculated according to the size of the small diameter).

8. Pay attention to the one-piece hinge

We need to pay attention to the one-piece hinge. We can use the toughness of PP material to integrate hinge design and product. The film size as the hinge should be less than 0.5mm and remain uniform. When injecting an integral hinge, the gate can only be designed on one side of the hinge.

9. Inserted the Inserts to Injection Mold

In Plastic Injection Mold, we usually insert inserts to increase local strength, hardness, and dimensional accuracy and set small screw holes. The material of the insert is generally made of copper, and the anti-rotation and anti-pull-out structure should be designed in the insert part, such as knurling and holes, bends, shoulders, etc.

10. Design multiple buckle devices to share

The buckle device is designed to be shared by multiple buckles at the same time, so that the whole device will not be unable to operate due to the damage of individual buckles, thereby increasing its service life.