Key points of Boss Pillar design in injection molds
Boss pillars are raised structures on plastic products used to fasten screws or other fasteners. They are usually made of plastic, but can also be made of metal or other material, and are embedded into the plastic product through injection molding, hot pressing, or other methods.
Function of Boss Pillars:
1. Provide installation positions for screws or other fasteners.
2. Enhance the strength and rigidity of plastic products, improving their load-bearing capacity.
3. Improve the connection performance of plastic products.
Key points of Boss Pillar Design:
1. Structural design.
Shape: the shape of the boss pillar should be as simple as possible, usually round. Round boss pillars are easy to process, have high strength, and have uniform stress distribution.
Size: the size of the boss pillar should be determined based on the product’s usage requirements. Generally, the height of the boss pillar should not exceed 2.5 times its diameter. If the boss pillar is too high, it can easily lead to air entrapment during injection molding.
Position: the position of the boss pillar should be as close as possible to the outer wall or ribs of the product. This can improve the strength of the boss pillar and make the material flow more smoothly.
2. Mold design
Draft angle: the boss pillar should have a draft angle to facilitate demolding. The draft angle is generally 3-5°.
Parting line: the parting line of the boss pillar should be consistent with the parting line of the product as much as possible. This can reduce mold processing costs and improve mold processing accuracy.
Core pulling: if the boss pillar needs to be ejected, an ejection mechanism should be designed. The ejection mechanism should be reasonably designed and easy to operate.
3. Process design
Raw material: the selection of injection molding material should be based on the usage requirements. Generally, materials with good fluidity and mechanical strength should be chosen.
Injection molding parameters: injection molding parameters should be determined based on the product’s shape, size, and material properties.
