How to Improve the Mold Strength and Rigidity?

Strengthen the overall Mold Strength and Rigidity of the formwork

• Avoid sharp corners in the opening frame of the movable and fixed molds (because the stress concentration phenomenon will occur at the sharp corners, which will cause local cracks)

• Conical positioning blocks are added between the movable and fixed molds to reduce elastic deformation (for deep cavity molds, to reduce the amount of elastic deformation, an inclined locking block is added between the front and rear molds to increase the rigidity of the template and reduce deformation)

• Reduce square iron spacing

• Choose a reasonable inlay direction and inlay structure for the inner mold

Increased lateral core pull and Insert Mold Strength

Inserts are subjected to high temperature and high pressure during injection molding, and the force situation is complex. A basic principle must be followed in the design: the strongest mold strength, and the maximum insert structure when the structural space allows.

• Modify the product’s structure to avoid the mold insert’s weak structure.

• Wedge block plus backhoe positioning block. When the lateral core-pulling is subjected to a large expansion force, to ensure that the slider does not retreat, a backhoe structure can be added to improve the mold strength of the locking block.

• Rely on the formwork’s rigidity to increase the locking block’s rigidity.

• When the core is very long, the end positioning should be increased to increase the mold rigidity and mold strength and reduce the deformation of the core.

• Using the mosaic structure to improve local mold strength.

Other aspects enhance the Mold Strength and Rigidity

1. Prevent the distance between the force point and the support point from being too far away.

2. Prevent the cantilever structure or reduce the length of the cantilever.

3. Do not ignore the beneficial effects that the workload can produce

4. Parts subjected to vibration loads are prevented from transmitting force by friction.

5. Prevent unbalanced forces in the organization.

6. Prevent only considering single-way of force transmission.

7. The influence of part deformation on force distribution during work should not be ignored.

8. Prevent cast iron parts from being subjected to large tensile stress.

9. Prevent the thin rod from bending stress.

10. Prevent excessive rigidity of parts subject to impact load.

11. Prevent the appearance of parts subject to variable stress from being too rough or scratched.

12. The surface of parts subject to variable stress should prevent residual tensile stress.

13. Parts subject to variable loads should prevent or reduce stress concentration.

14. Prevent the local structures that affect the mold strength from being too close together.

15. Prevent the pre-deformation from being in the same direction as the deformation of the working load.

16. The diameter of the pulley and drum of the wire rope should not be too small.

17. Prevent the wire rope from bending too many times, and pay special attention to preventing repeated bending.

18. When lifting, there should be a margin at the connection between the wire rope and the coil.

How to you Increase the plastic rigidity？

How to improve the hardness of the plastic surface?

If you want to increase the hardness of plastic products, the best way is of course to add high-hardness materials. Common hardness additives in plastics are rigid inorganic fillers and rigid fibers. Then Mohs hardness greater than 5 can be used as a hardness modifier.

Common fillers such as calcium carbonate, calcium silicate, and mica have a Mohs hardness of only 3, while glass fibers can reach 6.5. In addition, iron powder, glass beads, magnesium oxide, carbon fiber, etc. are all possible choices.

If the hardness of the product is required to be high, add fiber or superfine additives; if it can meet the needs of the product, use fillers with low hardness as much as possible to reduce severe wear on processing equipment.