The high degree of automation can reduce the physical labor intensity of the operator. The NC machining process is automatically completed according to the input program. The operator only needs to start setting the tool, loading and unloading the workpiece, and changing the tool. In the machining process, it is mainly to observe and supervise the operation of the machine tool.
However, due to the high technical content of CNC machine tools, the mental labor of operators is correspondingly improved. High precision and stable quality of machined parts. The positioning accuracy and repeated positioning accuracy of CNC machine tools are very high, which makes it easier to achieve the consistency of the size of a batch of parts. As long as the process design and program are correct and reasonable, combined with careful operation, the parts can obtain high machining accuracy, and it is also convenient to implement quality control of the machining process.
The molding sand, core sand and core bone on the casting shall be removed and cleaned. If the casting has an oblique position, its dimensional tolerance zone should be equipped symmetrically along the inclined plane. The molding sand, core sand, core bone, succulent plants, sticky sand, etc. on the castings shall be spaded, grinded and leveled, and cleaned neatly.
The alignment and staggering, punch casting deviation, etc. should be adjusted to achieve a smooth connection, so as to ensure the appearance quality. The folds on the non production processing surface of the casting shall be less than 2mm deep and the spacing shall be more than 100mm. The non production processing surface of equipment commodity castings shall be shot blasted or barrel rolled to meet the requirements of cleanliness sa21/2. Casting parts must carry out water toughening solution. The surface of the casting shall be leveled, and the rubber inlet, burr, slag inclusion, etc. shall be eliminated. Casting parts are not allowed to have cold shuts, cracks, holes and other defects that are detrimental to the application.
If the paint coating on the metal surface can effectively prevent the infiltration of water, oxygen, electronic devices and stray positive ions, it can greatly alleviate or prevent the corrosion of painted metal materials. If the actual effect of protection is not very good, the coating maintenance layer is not very good for the corrosion prevention and anti-corrosion maintenance of the alloy. Life practice shows that the water absorption of the sprayed protective layer seriously endangers the adhesion of the sprayed surface of metal materials, while the permeability obviously endangers the corrosion energy of metal materials. There are many kinds of etching types of sprayed metal materials, but the direct cause of etching is closely related to organic chemistry and chemical efficiency.