Jan 5, 2019
The machine builds up an appropriate pressure in order to move the melt into the cavity.
Dependent on the extending flow path length until the flow path end the pressure is rising during filling of the part.
The highest injection pressure can be found usually at the machine nozzle at VP-Switch.
Thin wall thickness leads to a higher pressure difference between melt entrance and melt front.
Nov 29, 2018
In the injection molding process, the period of filling cold runner (if it exists) and cavity is called injection time (purple line in time pressure diagram below).
A slow injection time has the advantage to have less shear and gentler treated material.However, there is the risk of high injection pressure or unfilled parts due to intense cooling of the melt because of a low injection time.
Dec 6, 2019
Liquid Silicone Rubbers (LSR) for plastic injection molding are delivered standard wise in buckets (2.5kg, 5kg,…).
For processing Component “A” and “B” is required in volume ratio of 1:1.
To assure an equal and constant, same as void-free dosing of material a dosing unit is required.
Dec 7, 2018
All information, which is needed for production, is collected on the machine setup sheet ( or machine datasheet).
It starts with the material and its drying conditions, then it continues with the machine data and the strokes of the mold.
After that, the process parameters follow.
This includes the temperatures of each cooling channel, hot runner and cylinder; cycle times, pressures and speeds.
With a correct filled datasheet, it is possible to reproduce the process anytime.
Jan 8, 2019
Metal Injection Molding is A PIM-process in which fine-powdered metal is mixed with a thermoplastic plastic binder material to a Compound is called metal injection molding. The fine-powdered metals are the feedstock. This feedstock can be processed with plastic injection molding. The plastic injection molding process allows competitive manufacturing of mid to high volumes and mid to high complex part designs.
In a second process step, the molded part is debindered – the thermoplastic binder is removed from the feedstock.
In a third process step, the debindered part is sintered.
Densities of 99,95 % and higher against compact virgin material can be obtained.
Material- and mechanical properties of final processed parts are mostly comparable to the corresponding compact, solid materials.
MIM is very cost competitive against standard multi stage cutting technologies like milling, drilling, grinding, etc.
Best practice examples for MIM-processes: Stainless steel watch-housings, aerospace, textile industry, medical applications and many others.
