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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

How to set the cutting amount when cutting stainless steel

The amount of cutting greatly affects the durability of tools, such as work hardening, cutting force, and cutting heat in the machining stainless steel. Whether the selected cutting amount is appropriate has a direct effect on the cutting effect.

1. Cutting speed Vc:

When machining stainless steel, the cutting speed is slightly increased, the cutting temperature is much higher, the tool wear is increased, and the durability is significantly reduced.
To ensure reasonable tool durability, it is necessary to reduce the cutting speed, which is generally selected between 40% and 60% of normal carbon steel. When drilling or cutting, the cutting speed will be slower due to the rigidity of the tool, heat dissipation condition, cooling effect, lubrication effect, and chip removal condition.

Different types of stainless steel have different machinability and the cutting speed needs to be adjusted accordingly. Generally, austenitic stainless steels such as 1Cr18Ni9Ti have a cutting speed correction coefficient Kv of 1.0, a hardness of 2cr13 or less, and an HRC28 or less. The Kv of martensitic stainless steel is 1.3 to 1.5, and the Kv of martensitic stainless steel such as 2Cr13 having a hardness of 28 to 35 is 0.9 to 1.1. The Kv of martensitic stainless steel such as 2Cr13 having a hardness of HRC35 or higher is 0.7 to 0.8. The Kv of concentrated nitric acid resistant stainless steel is 0.6 to 0.7.

2. Cutting depth ap:

There is a lot of room for roughing, and you must choose a larger cutting depth to reduce the number of tool movements and at the same time avoid contact between the tip and the surface of the blank to reduce tool wear. However, if the depth of cut is deep, care must be taken not to vibrate due to excessive cutting force. The option is ap = 2-5 mm. Smaller cutting depths can be selected for finishing and hardened layers should be avoided. Generally, p = 0.2 to 0.5 mm is used.

3. Feed amount f:

The increase in feed rate is not limited by the power of the machine tool. In addition, the feed amount cannot be increased because the remaining cutting height and chip accumulation amount increase as the feed amount increases.
To improve the quality of the machined surface, lower feed rates should be used for finishing. At the same time, note that f must not be less than 0.1 mm / r to avoid cutting in work-hardened areas, avoid trace feeds, and pay attention to the cutting edge so that it does not stay on the cutting edge. Should be. Cutting surface The cutting amount of machined stainless steel is shown in Tables 4 and 5.

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