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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

The influence of different types of nozzles on the thermal efficiency of the engine


The influence of combustion system parameters on engine performance. Fuel supply advance angle and fuel injection pressure test results show that the best fuel supply advance angle (CABTDC) of dimethyl ether during operation is: 19° under calibration conditions and 15° at low speed. This is 6°-9° smaller than the best fuel supply advance angle (25°) of diesel in operation; when the injection pressure of dimethyl ether is 15MPa (lower than the injection pressure of diesel 18MPa), the thermal efficiency is highest. This is because dimethyl ether has a higher cetane number, lower auto-ignition temperature and better atomization performance than diesel. Plunger Diameter The effects of three plungers with diameters of 8.5mm, 9.0mm and 9.5mm on the thermal efficiency of the engine were tested. The thermal efficiency η of the engine with different diameter plungers varies with the average effective pressure P. From this, it can be seen that the thermal efficiency of the engine increases with the increase of the plunger diameter. This is because the low calorific value and liquid density of dimethyl ether are only 64.7% and 80% of diesel. The increased fuel supply per cycle requires an increase in the diameter of the plunger to shorten the fuel injection duration to improve the performance of the engine.

Nozzle form and its depth into the cylinder The influence of 5 different forms of nozzles on the thermal efficiency of the engine was tested. Among them, the 5×0.32mm nozzle is the best, and the highest thermal efficiency is obtained. Compared with the 4×0.30mm nozzle used in the original machine, it has an increase in the number of nozzle holes, an increase in diameter, and an increase in the total flow area. The nozzle of this structure can be better with low intake swirl ratio (the best intake swirl ratio when using dimethyl ether is 1.4~1.8, which is much lower than the original engine swirl ratio 2.3) and large circulating supply Matching the amount of oil is conducive to the formation and combustion of the dimethyl ether mixture. Studies have shown that the best length of the nozzle to extend into the cylinder when using dimethyl ether is 5mm, which is longer than 3mm when using diesel. This is because dimethyl ether has good evaporation and atomization performance, and the spray cone angle formed by the fuel injected into the cylinder is large. In order to prevent the liquid fuel from hitting the bottom surface of the cylinder head and causing combustion deterioration, the length of the nozzle extending into the cylinder is required. Increase.

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