For precision parts, processing is very strict. The processing program includes cutting in, cutting out, etc. There are specific requirements for size and accuracy, such as how many micrometers are floating up and down 1mm. If the size difference is too large, it will become waste at this time, which is equivalent to reprocessing. This is time-consuming and laborious, and sometimes even the entire processed material is scrapped, resulting in increased costs. At the same time, these parts are definitely unusable.
The processing of precision parts is mainly based on the size requirements, such as the diameter of the cylinder, there are strict requirements, and the positive and negative errors are within the specified requirements to be qualified parts, otherwise they are all unqualified parts. There are also specific and strict requirements for length, width and height, and there are also regulations for positive and negative errors. For example, a built-in cylinder (take the simplest basic component as an example). If the diameter is too large and exceeds the allowable error range, it will not be inserted. If the actual diameter is too small, it will exceed the lower limit of the allowable negative error. If it is not inserted, it will cause the problem of too loose and weak insertion. These are unqualified products, or the length of the cylinder is too long or too short, which exceeds the allowable range of error. They are all unqualified products. They must be discarded or reprocessed. This will inevitably increase the cost.
The above are the requirements for precision parts processing, which is the most important size problem. It must be processed strictly in accordance with the drawings. The actual size of the processed will certainly not be exactly the same as the theoretical size of the drawing. However, as long as the processed size is within the allowable error range, it is a qualified part. Therefore, the requirements for precision parts processing It is processed strictly according to the theoretical size.
The second is advanced precision parts processing equipment and testing equipment. Advanced processing equipment makes it easier to process precision parts, with higher precision and better results. The testing equipment can detect parts that do not meet the requirements and send them to customers. The products really meet the requirements.
For precision machining, not all materials can be precision processed. The materials for precision machining are divided into two categories, metallic materials and non-metallic materials.
For metal materials, stainless steel has the highest hardness, followed by cast iron, followed by copper, and finally aluminum. The processing of ceramics and plastics is the processing of non-metallic materials.
1. The first is the requirement of material hardness. For some occasions, the higher the hardness of the material, the better, but it is limited to the hardness requirements of the machined parts. The machined material should not be too hard. If it is harder than the machine part, it cannot be processed.
2. Secondly, the material is moderately soft and hard, at least a grade lower than the hardness of the machine part. At the same time, it also depends on the purpose of the processing device and the rational selection of the machine part.
Therefore, the most basic one is that you must pay attention to the density of the material before processing. If the density is too large, the hardness is also large. If the hardness exceeds the hardness of the machine part, it cannot be processed. Not only will it damage the parts, but it will also cause danger, such as the turning tool flying out and hurting people. Therefore, for mechanical processing, the material material is lower than the hardness of the machine tool, so that it can be processed.