* Reasonable consideration of the contradiction between process and product performance
1. When designing injection molding products, it is necessary to take into account the contradiction between appearance, performance and process. Sometimes at the expense of parts of the process, good appearance or performance can be gotten.
2. When the defect of injection can not be avoided during physical design, placing the defect in the hidden part of products as far as possible.
* The relationship between stud aperture and self tapping screw diameter
Self Tapping Screw Stud Aperture
M2 1.7mm
M2.3 2.0mm
M2.6 2.2mm
M3 2.5mm
* Design philosophy of BOSS
1. Stanchion should not be used alone but should be connected to ektexine or be used with rib as far as possible to strengthen itself and make plastic flow more smoothly.
2. The height of stanchion is generally not more than two and a half times the diameter, when stanchion is too high, air trap will be caused during molding(excessive length will cause gas vent, burn mark and short shot).
3. If the height of stanchion is more than two and a half times the diameter,especially the stanchion away from ektexine, we can use rib to strengthen it.
4. The shape of BOSS is mainly round for other shapes are not easy to process.
5. BOSS should not be too close to corner or ektexine, and it should keep a distance from ektexine of the product.
6. Around BOSS, prevent shrinkage by removing parts of wall thickness.
7. Draft angle of Boss: generally,the external is 0.5°; the internal is 0.5°or 1°.
The article comes from China injection mold manufacturer - Mold Best Assurance Company Limited, website is www.mbamoldanddesign.com
