The location of these holes can only be determined at the completion of the mold design, after the location for all necessary heating and cooling channels and mounting holes and the shape of the mold part are finalized. It is usually best to provide the handling holes as close as possible above the center of [...]
During the design phase, the designer must try to foresee how a mold or mold part will be handled or mishandled. Where the handler, for example, the machinist, assembler, or molding technician, may cause injury to himself or the others. The designer must consider in all case show size, location, and number of tapped holes [...]
I think safety must be a primary consideration of the mold designer, how can a mold, or any heavy mold part, handled safely? No person should repeatedly lift parts heavier than 20kg or any part which is awkward to handle, regardless of weight, without some mechanical assistance, such as a hoist. Not only should nobody [...]
There are four situations during which part or all of the molds is handled […]
Properly increase section dimension of gate and runner; the position of gate is set at thick walls of the plastic parts and should be as symmetric as possible; improve mold exhausting condition; set cold-slug well with sufficient capacity to avoid cold material’s entering into the cavity and influencing filling and shrinkage compensation; […]
Properly improve injection and dwell pressure as well as the injection rate to increase melt's compression tightness; prolong time of injection and dwell( the freezing of gate should not occur too early) to realize sufficient shrinkage compensation; properly reduce melt temperature and properly raise mold temperature( whereas cooling should be reinforce at parts with thick [...]
Optimize prescription of plastics and prefer use resins with low shrinkage; reduce dosage of recycled materials; dry the material as much as possible; […]
The injection products should not be too thick and when necessary the stiffening rid can be added to reduce wall thickness; the wall thickness must be kept as uniform as possible and the shape and structure should be simple and symmetric; […]
Both the shrink mark and shrinkage porosity are defects of injection products due to the molding shrinkage at thick walls where no sufficient follow-up compensation is made. During the injection process, the surface layer of products often condenses first, followed by the center layer, which will cause sinking on the surface of parts with thick [...]
as an injection molding engineer, he should be very familiar with welding mark, the thread mark formed at the front confluence of two or more melt flows in the cavity is called welding mark or welding line. […]