Side holes may be molded automatically by using the cam action in the mold or with hydraulic or pneumatic actuators as shown in Fig. 2.34a. Fig. 2.34b illustrates a side hole that can be molded withou

The workplece shown in Fig. 6.64 is provided with a fine intermal thread. The plastic material flows into the nest through the side gate. The workpiece thread is machined by spring-operated slee...

The biggest problem of using removing the workpiece from the mold is to avoid the distortion of workpiece. Sometimes the depth short and the plastic material is in high flexibility or flexural modulus

In Fig6.63 the unscrewing gears 2 are driven by the motor through a pair of bevel gears 5. After the mold opened, the motor drives a pair of bevel gears 5, the gear 3 turns because gear 3 is connec...

it is undercuts in a molded plastic workpiece which can be produced by using a removable ejector bar. Usually undercuts should be avoided whenever possible, as they increase mold costs and workpieces

Motors, electric, pneumatic, hydraulic can be used in the plastic injection molds for the turning of threaded workpieces

Whenever the axis of a hole is not parallel to the draw of mold, either the forming core or pin that make the hole must be removed from the workpiece before the workpiece is retracted from the mold or

​An undercut is an indentation or projection on a workpiece usually means that the core moving direction is not parallel to the draw direction of mold, so that the molded workpiece makes ejection from

Fig 6.61 is a configuration of unscrewing of threaded cores with rack and gear. The rack 1 is fixed to the stationary clamping plate. Following solidification of the workpieces, the mold opens, gea...