Thick sections cool slower than thin sections. The thin section first solidifies, and the thick section is still not fully solidified. As the thick section cools, it shrinks and the material for the shrinkage comes only from the unsolidified areas, which are connected, to the already solidified thin section. […]
1) Drafts (or taper) in a mold, facilitates part removal from the mold. The amount of draft angle depends on the depth of the part in the mold, and its required end use function. […]
1) Sharp corners greatly increase the stress concentration. This high amount of stress concentration can often lead to failure of plastic parts. Sharp corners can come about in non-obvious places. Examples of this are a boss attached to a surface, or a strengthening rib. These corners need to be radiused just like all other corners. [...]
Die Organization for Standardization is a prerequisite for specialized production. The specialized production of the mold is to improve the quality of the die, die to shorten the manufacturing cycle, the key to lower costs. […]
1) Milk to taste Method: first clean with detergent and then to plastic cups ,soup into two key fresh milk, covered with lid, shake, so that every corner Cup contact with the milk, about 1 minute Finally Discard milk, will clean cup. […]
mold in the process, some parts due to not to put too much friction with the impact of higher wear and tear. At this time. This is just part of the replacement parts can still be used for molds. […]
Bosses are used for the purpose of registration of mating parts or for attaching fasteners such as screws or accepting threaded inserts (molded-in, press-fitted, ultrasonically or thermally inserted). […]
1) Ribs increase the bending stiffness of a part. Without ribs, the thickness has to be increased to increase the bending stiffness. Adding ribs increases the moment of inertia, which increases the bending stiffness. Bending stiffness = E (Young’s Modulus) x I (Moment of Inertia) […]
1) Parts should be designed with a minimum wall thickness consistent with part function and mold filling considerations. The thinner the wall the faster the part cools, and the cycle times are short, resulting in the lowest possible part costs. […]
Injection Molding Design Guidelines 1. Use uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times. 2. Use generous radius at all corners. The inside corner radius should be a minimum of one material thickness. 3. Use the least thickness compliant with the process, material, [...]