Category Archives: Plastic Injection Molds & Molding

Overview of Metal Injection Molding

Metal Injection Molding (MIM) is a variation on traditional plastic injection molding that enables the fabrication of solid metal parts utilizing injection molding technology. In this process, the raw material, referred to …

Tooling cost of cost drivers in plastic product project

Tooling cost The tooling cost has two main components - the mold base and the machining of the cavities. The cost of the mold base is primarily controlled by the size …

Production cost of cost drivers in plastic product project

Production cost The production cost is primarily calculated from the hourly rate and the cycle time. The hourly rate is proportional to the size of the injection molding machine being used, so it …

Undercuts of Plastic Product Design

Undercuts Minimize the number of external undercuts External undercuts require side-cores which add to the tooling cost Some simple external undercuts can be molded by relocating the parting line   Simple external undercut Mold …

Bosses of Plastic Product Design

Bosses Wall thickness of bosses should be no more than 60% of the main wall thickness Radius at the base should be at least 25% of the main wall thickness Should be …

Ribs of Plastic Product Design

Ribs Add ribs for structural support, rather than increasing the wall thickness   INCORRECT Thick wall of thickness t CORRECT Thin wall of thickness t with ribs   Orient ribs perpendicular to …

Draft of Plastic product design

Draft Apply a draft angle of 1° - 2° to all walls parallel to the parting direction to facilitate removing the part from the mold.   INCORRECT No draft angle CORRECT Draft …

Corners of plastic product design

Corners Round corners to reduce stress concentrations and fracture Inner radius should be at least the thickness of the walls   INCORRECT   Sharp corner CORRECT   Rounded corner Read …
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