The action of the machine itself is actually a movement that overcomes the resistance, that is to say, the machine must first provide a power slightly greater than (slightly equal to) the resistance, which is also called pressure on the injection molding machine. Only when this force is provided can it be moved; The action is divided into speed, which involves flow, it is the source of power, after the resistance is overcome and the flow is greater, the flow is faster, and the faster the action, the greater the resistance, so it can be said Exercise itself is looking for a balance between power and resistance. I think what you are concerned about may be the relationship between flow and pressure during injection and holding pressure of the injection molding machine.
The injection itself is a process in which the hot stream fills the mold cavity. In theory, if the surface defects of the product are not taken into account, the mold factor should be the faster the filling speed, the better. However, since the hot stream must generate resistance (pressure in the mold cavity) during the flow, the machine must provide a power greater than or equal to this resistance (injection) due to the internal pressure resistance of the mold cavity. Hydraulic pressure) to fill the hot cavity into the mold cavity, which means that the injection action is also to overcome the resistance action.
Some people may ask, is this pressure constant from the beginning to the end of the injection? Certainly not, even if the injection is at a constant speed (or a certain speed). Because the contact surface is continuously expanding as the material flow fills into the mold cavity, that is to say its force area is constantly expanding, so the injection pressure is changing during uniform injection. The injection pressure must also be constantly changing when the injection is not a single-stage speed, because in addition to the change in the force area, the speed of the stream filling is also changing.
