Hello everyone, I guess you must be looking for some reliable metal work shops. Starway is sure to be a good partner in your business. Today, let me introduce the machining allowance during the machining process.
The total thickness of the metal layer cut off on a machined surface during the process of turning the blank into a finished product is called the total machining allowance of the surface. The thickness of the metal layer cut in each process is called the machining allowance between processes. For rotating surfaces such as outer circles and holes, the machining allowance is considered from the diameter, so it is called symmetrical allowance (i.e. bilateral allowance), that is, the thickness of the metal layer actually cut is half of the machining allowance on the diameter.
The machining allowance of the plane is unilateral allowance, which is equal to the thickness of the metal layer actually cut. The purpose of leaving machining allowance on the workpiece is to remove the machining error and surface defects left by the previous process, such as cold hard layer, air hole, sand inclusion layer on the casting surface, oxide scale, decarburization layer, surface crack on the forging surface, internal stress layer and surface roughness after machining, etc. So as to improve the precision and surface roughness of the workpiece. The size of machining allowance has great influence on machining quality and production efficiency.
Excessive machining allowance not only increases the labor volume of machining, reduces productivity, but also increases the consumption of materials, tools and power, and increases the processing cost. If the machining allowance is too small, it can neither eliminate the various defects and errors of the previous process, nor compensate the clamping error during the processing of this process, resulting in scrap. The selection principle is to make the margin as small as possible on the premise of ensuring quality. Generally speaking, the more finishing, the smaller the process margin.
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