Operating weight
The operating weight is the mass of raw material required to manufacture a product .
Examples
- Metal chips are produced on a turned part during machining. The finished shaft weighs just 100 g . However, almost 200 g of steel were used to make it. The operating weight is thus 200 g.
- Slits are punched out on the inside and the contour on the outside on a punched part made of 1.0 mm stainless sheet metal. The 200 mm wide coil consumes 80 mm of material per part, taking into account the specific weight of sheet steel of 7.85–7.87 g / cm 3, this results in a mass of around 125 g, which is the operating weight here. The punched-out utility part, on the other hand, has only 50 g, for example, after subtracting the cut-away parts.
- Thermoplastic plastic is injected into a mold via sprues . If the plastic, which is just still liquid, has cooled down and is hard, the resulting component is removed from the mold. The sprues that are injected with it also fall out. The sprues are not part of the product, but are indispensable for its manufacture. For example, with a product of 30 g, the result is a sprue of 2 g, the insert weight is 32 g. The sprue can possibly be recycled and reused here.
application
The operating weight is particularly important where a unit price that is agreed between the supplier and the customer is directly linked to a raw material price, for example in the case of semi-finished products . In the event of a price increase of 1 euro per kilogram of steel of a certain type, the supplier receives the above. turned shaft per workpiece so 20 cents more and not just 10 cents. In the event of a price increase, the supplier will not be able to sell the metal shavings that are produced at a much higher price.
Other technical weight designations
The shot weight describes the material used in a production cycle. Several parts can be produced per cycle, as is customary in plastic injection molding or metal die casting (multi-cavity molds). If, on the other hand, only one part is produced per cycle, the shot weight is the same as the operating weight.