For precision components, the processing is very strict, the processing process into the knife, a knife and so on. For the size of the specific requirements, accuracy is also required, such as how many positive or negative microns for 1mm, if there are too many wrong sizes, the component should be too much waste, then equivalent to have to re-processing, time-consuming and labor-intensive, and sometimes even make the entire processing scrapped, This resulted in an increase in cost, and at the same time, the part certainly could not be used.
(1) the most important thing is the size problem, we must strictly follow the additional drawings for processing, the actual size of the processed will certainly not be the same with the theoretical size of the drawings, but, as long as the processing size within the allowable error are Qualified components, therefore, precision components processing requirements is strictly in accordance with the theoretical size of the processing.
Such as the diameter of the cylinder is how much, there are strict requirements, plus or minus the error within the specified requirements is qualified parts, or are unqualified parts; length width and height also have specific strict requirements, positive and negative errors are also provided, such as an embedded Cylinder (take the simplest basic components, for example), if the diameter is too large, exceeding the allowable range of error, it will cause, can not be inserted into the case, if the actual diameter is too small, exceeding the allowable lower limit of the error, it will cause the insertion is too loose, not solid problem. These are unqualified products, or the cylinder length is too long or too short, beyond the allowable range of error, are unqualified products, are to be scrapped, or re-processed, it will inevitably result in increased costs.
In order to ensure the accuracy of precision parts, rough, fine mechanical parts are best processed separately. Because the rough mechanical parts processing, cutting a large amount of cutting force suffered by the workpiece, clamping force, heat and more mechanical processing parts of the surface hardening more significant phenomenon, there is a large internal stress within the workpiece, if rough machined parts are machined continuously, precision of finished parts is quickly lost due to stress redistribution.
Through the error averaging method to improve its quality, it can make those local larger error more evenly affect the entire processing surface, so that the transmission to the workpiece surface machining error is more uniform, so the workpiece machining accuracy correspondingly greatly increased.
(2) a reasonable choice of equipment. Use good rigidity, high precision machine to get good results. Advanced precision parts processing equipment and testing equipment, advanced processing equipment makes the processing of precision parts easier, higher precision, better results. Testing equipment can detect failed parts, so that all products sent to customers really meet the requirements.
Rough mechanical parts processing is cut off most of the allowance, does not require a higher machining accuracy of mechanical parts, so the roughing should be large in power, the accuracy is not too high on the machine, finishing process requires a higher Accuracy of machine tool processing.
(3) in the precision parts processing route, often arranged with heat treatment processes. Heat treatment process position is as follows: In order to improve the metal cutting performance, such as annealing, normalizing, quenching and tempering, generally arranged before the processing of mechanical parts.
Skill planning and special skills equipment planning and production, the production plan preparation, the preparation of materials, etc., all the preparatory work. Followed by the rough production, through casting, stamping and other processes to complete; followed by parts processing, including cutting, heat treatment, the appearance of disposal.
(4) precision machinery parts processing material requirements or some, not what material are suitable for processing, such as too soft or too hard material, the former is not necessary for processing, while the latter is unable to process. Exceed the hardness of the machined parts, it is possible to collapse the parts, must pay attention to the density of the material before processing, if the density is too large, the equivalent of hardness is also great, and the hardness exceeds the mechanical parts (lathe turning tools) Hardness, that is, can not be processed, not only will damage the parts, but also cause danger, such as the collapse of the car accident hit people. Therefore, in general, for mechanical processing, the material is lower than the hardness of the knives, so that can be processed.