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What errors may occur during CNC machining and CNC machining​?

 CNC machining and numerical control machining are a method to control the movement of machine tools and the production process of machining through computer digitization and information digitization. It is an intelligent numerical control device developed as an economical, high-speed, reliable, multi-functional, intelligent, and open structure. CNC machining is also an important indicator that can measure the continuous level and comprehensive ability of a safety technology, as well as the degree of modernization of related science and technology capabilities, especially in aviation, biology, medical and other high-tech cultural industries, and it is also a powerful indicator. reflect. So, what errors may occur during CNC machining and CNC machining? Let us understand together:   The use of approximate machining motion or approximate tool contours causes errors in the CNC principle of machining. The reason why it is called machining principle error is because of the error in machining

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What are the rules for metal stamping die scrap tube?

The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th

What are the main causes of errors in the machining of mechanical parts?

 

Machining accuracy refers to the degree of conformity between the actual geometric parameters (size, shape and position) of the mechanical parts after machining and the ideal geometric parameters. In the machining of mechanical parts, errors are inevitable, but the errors must be within the allowable range. Passing errors Analyze and master the basic laws of its changes, so as to take corresponding measures to reduce machining errors and improve machining accuracy.

  • 1. Spindle rotation error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its average rotation axis at each moment. The main reasons for the radial rotation error of the spindle are: the coaxiality error of the spindle journals and bearings Various errors in itself, coaxiality errors between bearings, spindle deflection, etc.
  • 2. Guide rail error. The guide rail is the benchmark for determining the relative position relationship of the machine tool components on the machine tool, and also the benchmark for machine tool movement. The uneven wear and installation quality of the guide rail are also important factors that cause the guide rail error.
  • 3. Transmission chain error. The transmission error of the transmission chain refers to the error of the relative movement between the first and last ends of the transmission chain in the internal connection. The transmission error is caused by the manufacturing and assembly errors and the use process of each component of the transmission chain. Caused by wear and tear.
  • 4. The geometric error of the tool. Any tool will inevitably be worn during the cutting process, and this will cause the size and shape of the workpiece to change.
  • 5. Positioning error. The first is the error that the reference does not coincide. The reference used to determine the size and position of a certain surface on the part drawing is called the design reference. It is used on the process drawing to determine the size of the processed surface of the process The datum on which the position is based is called the process datum. When processing the workpiece on the machine tool, several geometric elements on the workpiece need to be selected as the positioning datum during processing. If the selected positioning datum does not coincide with the design datum, a datum will be generated. Non-coincidence error. The second is the inaccurate error of positioning pair manufacturing.
  • 6. The error caused by the force deformation of the process system. The first is the rigidity of the workpiece. In the process system, if the rigidity of the workpiece is relatively low relative to the machine tool, tool, and fixture, under the action of the cutting force, the deformation of the workpiece due to insufficient rigidity is The impact of machining accuracy is relatively large. The second is tool rigidity. The rigidity of the external turning tool in the normal direction of the machining surface is very large, and its deformation can be ignored. Boring an inner hole with a small diameter, the rigidity of the tool bar is very poor, The force and deformation of the rod have a great influence on the accuracy of hole machining. The third is the stiffness of machine tool components. The machine tool components are composed of many parts. There is no suitable simple calculation method for the stiffness of machine tools. At present, experimental methods are mainly used to determine the stiffness of machine tools.
  • 7. Errors caused by thermal deformation of the process system. The thermal deformation of the process system has a relatively large impact on the machining accuracy, especially in precision machining and large-scale processing. The machining error caused by thermal deformation can sometimes account for 50% of the total error of the workpiece. .
  • 8. Adjustment error. In each process of machining, the process system must be adjusted in one way or another. Since the adjustment cannot be absolutely accurate, adjustment errors occur. In the process system, the workpiece and the tool are in the machine tool The mutual position accuracy of the above is ensured by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of the machine tool, tool, fixture and workpiece blank meets the process requirements without considering dynamic factors, the influence of adjustment error , Plays a decisive role in processing accuracy.
  • 9. Measurement error. When measuring mechanical parts during processing or after processing, the measurement accuracy is directly affected by the measurement method, the accuracy of the measuring tool, the workpiece and the subjective and objective factors.

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