What are the 4 key variables in injection molding?
What is a tie bar in injection molding?
Tie Bars Support and align the platens, which then support the mold. The space between the tie-bars limits the size of the mold that can be placed in the injection molding machine.
What is tie bar less clamping?
Each tie-bar-less clamping unit is aligned precisely prior to delivery using the highly sensitive platen parallelism adjustment mechanism. This way it absorbs the machine's vibrations in a symmetric manner and remains parallel to the moving platen even during acceleration and deceleration.
The platen is the "table" or tool that holds the mold cavity. Spaced apart, the mold is inserted and clamped securely to the platens. Once the two platens come together and are held under the pressure of tonnage, the plastic is heated, injected under pressure, and then allowed to cool through a molding cooling cycle.
What are the two basic types of clamping units?
There are 2 types of clamping methods, namely the toggle type shown in the figure below and the straight-hydraulic type in which a mold is directly opened and closed with a hydraulic cylinder. The functions of the injection unit are to melt plastic by heat and then to inject molten plastic into a mold.
How do you check for platen parallelism?
To measure platen-to-platen parallelism, the laser plane is bucked in to the fixed platen. A target is then placed on the opposing or moveable platen and zeroed on one point, usually one corner. Next, the three other corners are measured for deviation from the first corner.
What is clamping system also explain toggle clamping?
Toggle clamps are quick-action clamping tools that operate using an over-center locking principle known as a “toggle action.” Utilizing a system of levers and pivots, the clamping handle moves a linkage to its center position and the clamping arm meets the center to hold the fixture or workpiece in a locked position.
What are the 3 main parts of an injection molding machine?
Main components of injection molding machine Consists of three main components: Screw motor drive. Reciprocating screw and barrel. Heaters, Thermocouple, Ring plunger.
What are main characters of injection molding process?
There are six stages in the injection moulding process: mould clamping, injection moulding, pressure holding, cooling, mould opening, and plastic parts removal. These six stages directly determine the quality of injection moulded product, and these six stages are a complete continuous process.
What are the three sections of the injection molding screw What are their features?
If you are, you are inviting Murphy—as in trouble—to the party. Conventional screws have three sections: Feed, transition, and metering. As the screw turns and backs up to make the shot, the feed section of the screw actually becomes shorter from the point of view of the pellets.
How many parts can an injection mold make?
The Mold has the shape Made of Steel or Aircraft Aluminum, The injection mold can produce over 1 million parts.
What are the 4 key variables in injection molding?
These variables are: injection velocity, plastic temperature, plastic pressure, and cooling temperature and time. Control of these variables during each of the four phases of the injection molding process can help improve part quality, reduce part variations, and increase overall productivity.