In the process of turning from blank to finished product, the total thickness of the metal layer excised on a machining surface is called the total machining allowance of the surface. The thickness of the metal layer removed by each process is called the inter-process machining allowance. For rotating surfaces such as outer circle and hole, machining allowance is considered from diameter, so it is called symmetrical allowance (bilateral allowance), that is, the actual thickness of metal layer excised is half of machining allowance on diameter. The machining allowance of plane is the one side allowance, which is equal to the actual thickness of the removed metal layer. The purpose of the remaining machining allowance on the workpiece is to remove the machining errors and surface defects left by the previous process, such as the cold hard layer of the casting surface, pores, sandwich layer, oxide skin, decarburization layer, surface cracks on the forging surface, and the internal stress layer and surface roughness after cutting. Thus, the precision and surface roughness of the workpiece can be improved. The machining allowance has great influence on the machining quality and production efficiency. Excessive machining allowance not only increases the labor of machining and reduces productivity, but also increases the consumption of materials, tools and electricity 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 mounting errors of this process, resulting in waste products. Its selection principle is to ensure the quality of the premise, so that the margin as small as possible. Generally speaking, the more elaboration, the smaller the process margin.
1. Processing of various metal parts;
2. Sheet metal, box and metal structure;
3. Machining of titanium alloy, high-temperature alloy and non-metal;
4. Design and manufacture of wind tunnel combustion chamber;
5. Design and manufacture of non-standard equipment.
6. Mold design and manufacturing.
The machine needed for machining is made up of digital display milling machine, digital display forming grinder, digital display lathe, electric spark machine, universal grinder, machining center, laser welding and moving
Commonly used mechanical
Common machines (3 pieces)
This kind of machine is good at turning, milling, planing and grinding of precision parts. It can process all kinds of irregular parts with machining accuracy up to 2 million.
