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Stainless Steel is the abbreviation of stainless steel and acid resistant steel. The steel that is resistant to weak corrosion media such as air, steam and water or has stainless property is called stainless steel; The steel resistant to chemical medium corrosion (acid, alkali, salt and other chemical etching) is called acid resistant steel. Due to the difference in chemical composition, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid resistant steel is generally stainless. Historical origin The invention and use of stainless steel can be traced back to the First…

1、 Indexable tool blade model compilation standard 1. Model representation rules of indexable turning tool GB ／ T5343.1, which is equivalent to ISO5680-1989. It is applicable to the model establishment of modular cutter heads for indexable cylindrical turning tools, end turning tools, anti profile turning tools and assembled composite tools. The model is also composed of a group of letters and numerical codes arranged in the specified order. 2. Model representation rules of indexable tools with holes It is based on ISO7406-1986. It is applicable to the compilation of models of indexable surface tools, three side edge (groove) tools, sleeve…

1. Annealing Operation method: After the steel is heated to the temperature of Ac3+30~50 ℃ or Ac1+30~50 ℃ or below (relevant materials can be consulted), it is usually cooled slowly with the furnace temperature. Intention: 1. Reduce hardness, improve plasticity, and improve cutting and pressure processing functions; 2. Refine grains, improve mechanical functions, and prepare for the next process; 3. Eliminate the internal stress caused by cold and hot working. Application keys: 1. It is applicable to forgings and weldments of alloy layout steel, carbon east and west steel, alloy east and west steel, high-speed steel, and raw materials with…

"Plastic performance is the foundation of injection molding technology". Mastering the process performance and characteristics of various plastics is the basic professional knowledge that every injection molding worker must understand. The performance of plastics is the basis for setting the "injection molding process conditions", and is also one of the factors that must be considered when analyzing the quality problems and anomalies in the injection molding process. 1. Injection molding process of polypropylene (PP) PP is generally called polypropylene, also known as "100 fold rubber" because of its good anti breaking performance. PP is a semi transparent and semi crystalline…

Mechanical parts play a vital role in the use of machinery, so we must carry out regular maintenance and repair. In order to improve the service performance of mechanical equipment and prolong the service life of mechanical parts, when the machinery is stopped, it is necessary to detect the correlation of mechanical parts to ensure the safe use of parts. 1. It is important to keep the bearings and lubrication clean. Clean the machine surface before inspection, and then remove the parts around the bearing. The oil seal is a very fragile part, so it is necessary to remove it…

1. Why is phosphoric acid mostly used as the curing agent of high nitrogen furan self hardening resin, but rarely used as the curing agent of low nitrogen furan self hardening resin? This is due to the low nitrogen and high furfuryl alcohol resin. When acid is used as the curing agent, the curing speed is slow, the demoulding time is long, and the strength is very low. The necessary hardening rate can be obtained by using phosphoric acid as curing agent for high nitrogen and low furfuryl alcohol resin. Moreover, high nitrogen and low furfuryl alcohol resin can obtain…

The most important point in ultra mirror polishing is the size of the polishing. The distance from the whetstone to the mirror polishing is the most basic principle (ideally # 1500 whetstone starts to grind). Before the next operation, the mold must be thoroughly cleaned to achieve good results. Be very careful not to make repeated modifications (repeated modifications will affect the quality). The deadline for delivery, time pressure, excessive fatigue, and reduced concentration are all factors that can easily affect the work, which should be paid attention to. Experts pointed out that polishing operation is a time-consuming and expensive…

The surface to be overlaid shall be free of extrusion or scale like marks, and the roughness shall not be less than; The surface of seamless steel pipe or pipe fitting to be welded shall be polished with polishing wheel, and the surface shall be free of rust; Before surfacing welding of rolled pipe or barrel section, the weld on one side of the surface to be welded must be polished to be flush with the base metal; The surface of groove to be overlayed; The equipment for groove surfacing is generally used in high temperature and high pressure environment,…

Machine tool structural parts The spindle is an original electric spindle imported from Italy. 2. Japanese servo motor and high-precision linear guide rail are used. 3. Casting table. 4. High power dust collector Now, CNC milling machines have a wide range of uses in our lives, especially in industry. However, it has always been a difficult problem to detect and record the tool wear of CNC milling machines. Now, we invite relevant experts to introduce how to record the tool wear of CNC milling machines. In the past, people mainly used the magnifying glass integrated with the measuring ruler to…

During injection molding, the mold temperature is easy to affect the molding cycle and molding quality. In actual operation, it is set from the lowest appropriate mold temperature of the material used, and then adjusted appropriately according to the quality status. Die temperature refers to the temperature on the surface of the die cavity when forming is being carried out. In terms of die design and the setting of forming engineering conditions, it is important not only to maintain an appropriate temperature, but also to make it evenly distributed. Uneven mold temperature distribution will lead to uneven shrinkage and internal…