T = A x cf. For example, the projected area of the molded part is 150 sq/in times a clamp factor of 3 (tonnage needed/square inch from material data sheet). 150 x 3 = 450 tons needed. If you are running in a 500-ton press, try starting at 450 tons.2020-05-05
What is shot capacity in injection molding?
The maximum weight of material that can be delivered to an injection mould by one stroke of the ram.
What is shot weight?
The shot weight of a product is the amount of material required to be injected into the mold to manufacture the product, including the feed system. While calculating the shot weight, the actual product, spruce, runner, gates, etc., are considered. Shot weight is always lesser than the shot capacity.
What is shot size in injection Moulding?
The shot size is the maximum amount of plastic injection mold that can be injected in one molding cycle and is rated in ounces of general purpose polystyrene (GPPS) for U.S. machines[10] and cm3 for European and Asian machines[11] For best quality, parts must use about 60 to 70% of a machine¡¯s rated shot size[12].
What is barrel capacity in injection molding?
Barrel residence time is the time the resin spends from the first inception into the injection barrel until it leaves through the end of the nozzle. Barrel capacity is generally rated by the amount of polystyrene they can inject in one shot and is usually rated in ounces or grams.2013-02-22
How do you calculate MHR for injection molding?
A machine hour rate for a specific machine cost centre is computed by dividing the total overhead estimated or incurred for that machine divided by actual or estimated machine hours.
What is injection rate 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.2020-10-12