Precision parts processing
The process of parts processing has extremely strict requirements. A little carelessness in processing will cause the error of the workpiece to exceed the tolerance range, requiring reprocessing, or announcing the blank scrap, which increases the cost of production. Therefore, what are the requirements for parts processing can help us improve production efficiency.
Secondly, equipment requirements, rough and fine processing should be carried out with equipment of different performance. Since the rough machining process is to cut most parts of the blank, a large amount of internal stress will be generated in the workpiece when the feed rate is large and the cutting is large, and the finishing process cannot be performed at this time. When the workpiece is finished after time, it should work on a relatively large machine tool, so that the workpiece can achieve high precision.
Third, the processing of parts and components often involves surface treatment and heat treatment, and the surface treatment should be placed after mechanical processing. And in the machining process, the thickness of the thin layer after surface treatment should be considered. Heat treatment is for the cutting performance of the metal, so it needs to be performed before machining. The above are the few requirements that need to be followed for parts processing.
The dimensional requirements must be processed in strict accordance with the geometric tolerance requirements of the drawings. Although the size of the parts processed by the enterprise will not be exactly the same as the size of the drawing, the actual size is within the tolerance of the theoretical size, and it is a qualified product and is a part that can be used.
Precision machining has many technical difficulties, many influencing factors, wide range, high investment intensity and strong product personality
1. Processing equipment and process equipment: precision machining should have high precision, high rigidity, high stability and automation machine tools, corresponding diamond tools, cubic nitride jumping tools, diamond grinding wheels, cubic nitride jumping wheels, and corresponding high precision, high rigidity fixtures and other equipment, in order to ensure the processing quality. Precision machine tools with corresponding precision should be considered in precision machining. Many precision machining often starts from the design and manufacture of ultra precision machine tools. And to configure the required tools. At present, the general series of precision machining machine tools are less, and the batch will not be large. The cost of precision machine tools is very high, so special orders are needed. If the existing precision machine tools can not meet the requirements. The machining accuracy can be improved by technological measures or error compensation.
2. Detection: precision machining has corresponding detection technology, forming the integration of processing and detection.
There are three ways to detect precision machining: off-line detection, on-line detection and on-line detection. Off line detection means that after processing, the workpiece is sent to the inspection room for detection; In place detection means that the workpiece is not unloaded after being processed on the machine tool, and is detected on the spot. If any problem is found, it is convenient for further processing; In order to control and implement dynamic error compensation actively, online detection is carried out in the process of machining. Error compensation is an important measure to improve the machining accuracy, which is based on the machine tool manufacturing accuracy has reached a certain level. The influence error is separated, and the error value is compensated by the error compensation device. Among them, the static error compensation is based on the error value of the side out in advance, which is compensated by hardware or software during processing. For example, the pitch error of the transmission wire of the machine tool can be compensated by the correction ruler; On the basis of on-line detection, the dynamic error compensation is implemented in real time during machining. The online detection and compensation technology of precision machining is the key technology to ensure the quality of precision machining. The detection technology is integrated into the content of precision machining, and the online measurement method can make the operator find the problems of the workpiece in time and feed back to the CNC system.
3. Processed materials: the processed materials of precision machining have strict requirements on chemical composition, physical and mechanical properties, chemical properties and processing properties, and should be uniform in texture, stable in performance, and free from macro and micro defects inside and outside. The expected effect of precision machining can be obtained only when the material meets the performance requirements.
The process of precision parts processing has very strict requirements. If there is a little carelessness in processing, the workpiece error will exceed the tolerance range, so it needs to be reprocessed, or the blank will be scrapped, which greatly increases the production cost. Therefore, what are the requirements of precision parts processing, can help us improve production efficiency.
Secondly, equipment requirements, rough and finish machining should use different performance equipment. Because the rough machining process is to cut most parts of the blank, the workpiece will produce a lot of internal stress when the feed rate is large and the cutting depth is large, so the finish machining can not be carried out at this time. When the workpiece is finished after a certain period of time, it should work on the machine tool with high precision, so that the workpiece can achieve high precision.
Thirdly, the processing of precision parts often has the process of surface treatment and heat treatment, and the surface treatment should be put after precision machining. And in the process of precision machining, the thickness of thin layer after surface treatment should be considered. Heat treatment is to improve the cutting performance of metal, so it needs to be carried out before machining. These are the requirements of precision parts processing.
Dimension requirements, must strictly follow the shape and position tolerance requirements of the drawings for processing. Although the parts as like as two peas are actually not identical with the size of the drawings, the actual dimensions are all qualified products within the theoretical dimension tolerance, and are the parts that can be used.