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1。 Blank and variety of materials, parts generally is steel, cast iron, bronze, brass, lead and other materials. Average pore diameter of less than 20 mm sleeve, the other with hot rolled or cold rolled blank material, when the aperture is more than 20 mm, with the steel tube, die casting, perforated castings. 2. Between process machining allowance set of parts rough machining allowance in casting. When forging has been determined. If on the solid material processing out of the hole. After drilling. Boring. Reaming in one process is complete, must allow machining allowance for the next working procedure.
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