What is semi finishing

What is semi finishing

With the same cutting tool and cutting parameters, semi finishing and finishing can correct various geometric errors of cutting tools and elastic deformation of parts, It is easy to ensure the size and finish machining the important bottom surface. Don’t think that high-precision parts processing is a common processing without paying attention to it. If we ignore some details, it may have a great impact on the processing of parts, so what are the matters needing attention in the processing of high-precision parts?

  1. For high-precision parts, the processing is very strict, and the processing procedures include feed in and out. CNC machining has specific requirements for size and accuracy, such as 1 mm plus or minus how many microns. If the size is wrong too much, it will become a waste product. At this time, it is equivalent to re processing, which is time-consuming and laborious. Sometimes, the whole processing material will be scrapped, which leads to the increase of cost. At the same time, the parts are definitely unusable.
  2. For high-precision parts processing, it is mainly the size requirements, such as the cylinder diameter, there are strict requirements, and the positive and negative errors within the specified range are qualified parts, otherwise, they are all unqualified parts; There are strict requirements for length, width and height, as well as positive and negative errors. For example, for an embedded cylinder (take the simplest basic parts as an example), if the diameter is too large and exceeds the allowable range of error, it will cause the situation that it can not be inserted. If the actual diameter is too small and exceeds the lower limit of allowable negative error value, it will cause the problem of too loose insertion and not firm. These are all 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 reprocessing, which will inevitably cause the increase of cost.
  3. In fact, the processing requirements of high-precision parts are the most important dimension problems. We must process them in strict accordance with the additional drawings. The actual sizes processed by CNC will not be the same as the theoretical dimensions of drawings. However, as long as the machining dimensions are within the allowable range of error, they are all qualified parts. Therefore, the requirements of precision parts processing are strictly in accordance with the theory Dimension processing.
  4. The second is the advanced precision parts processing equipment and testing equipment, advanced processing equipment makes the processing of precision parts more simple, higher precision and better effect. CNC processing and testing equipment can detect parts that do not meet the requirements, so that all products sent to customers really meet the requirements.

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