It also is important during the time you are packing the mold, to observe whether or not the gate is sealed. This is an area that causes a lot of trouble with new tools. They are absolutely sure—based on the long hold time they have used in the process—that the gates are sealed, [...]
After filling you must pressurize the mold to get a good imprint of the cavity to minimize the effects of cooling. Short shots, sinks, voids and dimensional variations in parts are caused because of insufficient packing pressure in the mold cavities. […]
As part of a rigorous mold tryout, it is essential to instrument a mold to see what is going on inside the mold. […]
With the proper temperatures set, the mold must be filled as fast as consistently possible. This means that the mold should be able to be filled to at least 90 percent of the injection rate of the production molding machine without adverse effects. […]
It starts out with the temperatures of the plastic. The temperature of the plastic coming out of the molding machine should be right down the middle of the manufacturer’s spec. If you can run a mold here, […]
How do you get a ready-to-go mold? Obviously, it starts with good design with no broken rules. It must be cut properly. It must be assembled properly. Checks must be made to ensure that all items function as designed, clearances are proper and water lines are correct based on flow. […]
The unitized system offers considerable improvements in quality and addresses the cost of repair favorably. Since the integrated system is based upon using the unitized prewired design for installation in the mold, the chance for pinched or severed heater and thermocouple wires is eliminated during assembly. […]
On unitized systems, the nozzles and manifold block constitute a single drop-in unit. The melt channel runs from the manifold block directly to the nozzle without any potential misalignment or dead spots. Any potential for plastic leakage between the nozzles and the manifold block is eliminated since the nozzles are inserted within the manifold by [...]
Typically in a simulation program, the user designs CAD solids that collectively represent the CNC machine being used to cut the mold. The user also specifies how the solids move and interact, mirroring the operation of the actual machine. Tool, workpiece and spindle attachment locations are defined via user coordinate system (UCS) points consisting of [...]
In addition to simulating and verifying that the NC program produces the correct finished part, the right simulation/optimization software should enable manufacturers to build and simulate entire CNC machines in order to eliminate potentially disastrous machine crashes. A machine crash can be very expensive, […]