Table of Contents
What is cycle time in injection molding machines?
Cycle time is the total time required to complete all the stages of the injection molding cycle. The cycle time is made up of the following stages: Fill time. The time required to fill the mold with polymer.
What is pack and hold pressure in injection molding?
(1) The Significance of Pressure Holding/Pack After the mold cavity is filled, holding pressure is applied to compensate for resin shrinkage caused by cooling. Appropriate holding pressure and holding time will be maintained to push the mold screw, to continue injecting molten resin into the cavity.
What is injection time?
The injection time is the time it takes for the mold to fill completely. When you set up a Fill+Pack analysis sequence, the software can be set to either calculate a machine injection time automatically, or on the basis of a user-specified value. By default, the injection time is calculated automatically.
How do I calculate my cycle time?
Cycle Time calculation in a Continuous Process. Cycle time = Average time between completion of units. Example: Consider a manufacturing facility, which is producing 100 units of product per 40 hour week. The average throughput rate is 1 unit per 0.4 hours, which is one unit every 24 minutes.
What is injection speed in injection molding?
Injection speed refers to the speed at which the screw or plunger moves during injection. As it goes faster, it takes a shorter time to complete one injection stoke, and allows greater yield.
How do you calculate holding pressure in injection molding?
Hold pressure and speed are usually 50\% – 65\% of the top injection pressure and speed. That is to say, the holding pressure is approx. 0.6 – 0.8MPa lower than the injection pressure that feeds plastic into the mold cavity.
How do you calculate cooling time in injection molding?
First, divide the square of the part thickness by the product of the following: the square of the thermal diffusivity, multiplied by 6.28 (or two times “pi”). This number is then multiplied by a logarithmic equation.
How do I check my injection timing?
You can check the injection timing by measuring the injector pump’s stroke at TDC using a dial indicator.
How is injection molding injection time calculated?
Molding cycle t (sec) = t1 + t2 + t3 + t4, where, t1 is the injection time = injection time + dwelling time (sec), t2 is the cooling time (sec), t3 is the time (sec) needed to remove the molded product, and t4 is the time (sec) needed to open and close the mold.