Knowledge of bending machine

Bending machine mould (mújù), English is press braketool. It is a tool used by the bending machine to form and process sheet materials. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the article through the change of the physical state of the formed material. It is a tool used to make the blank into a part with a specific shape and size under the pressure of the bending machine.

  The bending machine mold is divided into the upper mold and the lower mold of the bending machine, which are used for sheet metal stamping forming and separating molds. The mold used for forming has a cavity, and the mold used for separation has a cutting edge.

   Material selection of bending machine mold

Generally use T8 or T10, and the better 42CrMo material, it mainly requires high strength, high toughness and good wear resistance. Choose cold work die steel. Cr12MoV is a very good material. The performance can be satisfied. The process performance is good, the price will be higher. 42CrMo is a high-strength alloy quenched and tempered steel with high strength and good toughness. It can work below 500 degrees.

   Several major regions of China’s mold industry

  In recent years, the mold industry has developed rapidly, and its geographical distribution characteristics have gradually taken shape. In terms of regional distribution, the Pearl River Delta, Yangtze River Delta and Anhui have developed rapidly.

  Guangdong

  Guangdong is now China’s main mold market, and it is also China’s largest mold export and import province. More than 40% of the national mold output value comes from Guangdong, and the numerical control rate of mold processing equipment and the performance of the equipment, mold processing technology, production specialization level and standard level exceed other domestic provinces and cities.

   Among the top 10 enterprises in the country, Guangdong occupies 5. The world’s largest mold base suppliers and Asia’s largest mold manufacturers are located in Guangdong.

   With the further optimization of the industrial structure of Guangdong, the development of petrochemical, automotive, high-tech and other industries has put forward higher requirements for Guangdong’s mold manufacturing. In the next few years, Guangdong’s mold manufacturing will become increasingly complex.

  Shanghai

   There are more than 1,500 mold companies in Shanghai, with more than 70,000 employees, and an annual output value of nearly 10 billion yuan, with an average annual growth rate of more than 20%. By 2010, the total output value will reach about 20 billion yuan; the import value will be reduced by 30% from the current 290 million yuan, which will increase the output value of the industry by about 700 million yuan, and the export value will reach 130 million US dollars, which will increase the industry again. 600 million yuan in output value.

Shanghai mold industry will face 6 major industries and important industries, especially the information (IT) industry and the automobile industry, vigorously develop magnesium alloy die-casting molds and injection molds in the IT industry; automobile industry cover molds, large-scale parts die-casting molds, and stamping parts Multi-task bit progressive die. In 2010, 85 percent of the molds in the IT industry were localized, and 90 percent of automotive molds were localized.

According to preliminary statistics, there are nearly 70 mold companies in Shanghai producing automobile stamping, plastics, and die-casting, with an annual output value of about 2 billion yuan. Private enterprises such as Huazhuang, Qianyuan, Yifeng, and Huangyan, and joint ventures such as Diyuan, Visteon, and Small Taiwan-funded enterprises such as Lianheng, Hongxu, and Tai Litong have a multi-year output value of more than 50 million yuan, of which nearly 7 companies have reached an annual output value of 100 million yuan, and some companies have an annual growth rate of 100%. Become the main force in the Shanghai automotive mold industry.

  Zhejiang

   Zhejiang Province’s mold industry is mainly concentrated in Ningbo and Taizhou. Ningbo’s Ninghai, Yuyao, Cixi and Yinzhou mainly produce plastic molds, Beilun mainly produces die-casting molds, and Xiangshan and Zhoushan mainly use casting and stamping molds. The main mold manufacturing enterprises in Taizhou are concentrated in Huangyan and Luqiao, with plastic molds accounting for the majority.

   Zhejiang mold industry has some obvious characteristics. First, almost all mold manufacturers are private enterprises; second, mold companies are relatively concentrated and have formed a mold market; third, while molds can meet the needs of users at different levels, high-level molds are developing rapidly, and they have occupied a large proportion; Fourth, through many entrepreneurial ventures, a number of high-quality backbone enterprises have emerged; fifth, specialized division of labor has naturally formed, with obvious main corporate characteristics; sixth, the development of the mold industry has an obvious pulling effect on the industrial development of the local and surrounding areas.

   Jiangsu

   There are more than 1,000 mold factories of various types in Suzhou, Jiangsu, and more than 1,000 mold processing points. The annual sales of molds are about 5 billion to 6 billion yuan. The mold industry has become one of the emerging industries in the city.

Japan, South Korea, Singapore, Germany, the Netherlands, the United States, Taiwan and Hong Kong have many sole proprietorships and joint ventures, as well as many private mold companies; Suzhou Lampei Casting, Yuanqing Molding and other companies mainly produce die-casting parts such as automobile engines and wheels. Molds and casting molds, Kunshan medium and large mold bases, Kunshan mold standard parts, Kunshan Huaxing mold guides and other companies specialize in the production of various large mold bases, mold guides, mold springs and other standard parts.

   Anhui

At present, Anhui Province has a number of well-known domestic mold products, such as large-cavity injection molds for washing machines and air conditioners, blister foaming molds for refrigerators, high-speed progressive die for motor stator and rotor laminations, etc. Some of them have a market share of up to 30 % Or more; automobile structural parts and interior parts molds have been steadily used in the development of new models of Shanghai Volkswagen; rubber tire molds are recognized by major domestic tire companies; mold standard parts and mold material bases have also been formed.

   A group of energetic private mold companies are emerging, and a gathering area for mold manufacturing is taking shape. Ma’anshan City is a national production base for bending machines, shears, blades, and molds. Chuzhou City has become an important manufacturing base for blister foam molds for refrigerators; Ningguo City is a gathering area for rubber molds; Xuanzhou City and Wuhu City are mainly based on sheet metal stamping molds, which are important manufacturing and supply bases for auto parts; Bengbu City The thick plate stamping progressive mold has its own characteristics; Hefei has certain advantages in injection molds, automobile molds and rapid mold making.

   China’s national conditions and applications

   Observing the development of China’s manufacturing industry worldwide, it can be seen that China’s manufacturing industry has developed rapidly in recent years. For the CNC bending machine mold industry, this means a larger market. In this context, China’s low-level manufacturing costs are a recognized fact. In terms of labor productivity, statistics show that, compared with developed countries such as Germany, the United States, and Japan, the gap between China and developed countries is about 3 to 5 times. Such a large market, low level of labor productivity, coupled with the continuous progress and development of manufacturing technology, is both an opportunity and a challenge for the CNC bending machine mold industry. The market demand for CNC bending machine molds is not only an increase in quantity, but more importantly, an improvement in quality. From the perspective of user industries, there are seven major industries that have significant demand for CNC bending machine molds.

   One is the power generation equipment manufacturing industry.

   In the context of the increasingly tight global energy supply and the continuous increase in oil prices in Yangyanlizd, the demand for power generation equipment has become more and more obvious. In the manufacturing process of power generation equipment, the cost only spent on the mold part of the CNC bending machine is very considerable.

   The second is the mold manufacturing industry

   In the mold manufacturing process, almost all links such as forming molds, hot work molds, cold work molds, and plastic molds need to use CNC bending machine molds. In addition, automobiles, high-speed trains, general machinery manufacturing, and the wood processing industry, which has gradually expanded its use in recent years, have become the main users of the CNC bending machine mold industry.

   The third is the aerospace industry

   In this industry, CNC bending machine molds are generally used to cut aircraft structural parts. These structural parts are generally large in size, and aluminum alloys have been widely used in the past. With the expansion of application fields of titanium alloys and composite materials, the requirements for mold processing of CNC bending machines are getting higher and higher.

  As one of the important industries supported by the country, the government has invested a lot of money in the research and development of large passenger aircraft in the aerospace industry in recent years. These research and development are all aspects, we extracted the aspects related to CNC bending machine molds to analyze, focusing on the use of structural materials.

   It can be seen from the new Boeing 787 fuselage that in the past, a large number of aluminum alloy direct covering methods have been gradually abandoned and replaced by direct laying and winding of composite materials. In addition, the amount of titanium alloy is also increasing. Compared with the past, the new method can greatly reduce the weight of the aircraft, save fuel and energy consumption, this is especially important for large passenger aircraft.

  Titanium alloy is recognized as a difficult-to-process material. The composite material that only needs to be laid and wound does not seem to require a large amount of processing, but the requirements for processing quality are getting higher and higher. For the CNC bending machine mold industry, this is not a small challenge. In addition to the fuselage structural parts, the processing of aircraft engines is also a difficult point. Engines are generally made of difficult-to-machine materials with complex shapes, which require processes such as slotting and drilling, blade processing, etc., which require very high requirements for the actual cutting effect of CNC bending machine molds. In addition, in order to meet the high-quality requirements of aircraft structural parts, under normal circumstances, the overall blank is used for processing, and more than 90% of the material will be removed. Due to the large amount of processing, the processing efficiency is relatively high.

  The development trend of cutting technology

From the perspective of the development of CNC bending machine molds, from the end of the nineteenth century to the middle of the twentieth century, high-speed steel was the main representative of CNC bending machine mold materials; Widely used; in the 1950s, Sweden and the United States synthesized synthetic diamonds respectively, and the cutting of CNC bending machine molds has since entered a period represented by superhard materials. In the 1970s, people synthesized polycrystalline diamond (PCD) using high-pressure synthesis technology, which solved the problem of small quantity and high price of natural diamond, and expanded the application range of diamond CNC bending machine molds to aviation, aerospace, and automobiles. , Electronics, stone and other fields.

  The choice of mold materials for CNC bending machines is the basis for successful cutting. Compared with cemented carbide, the die speed of PCD CNC bending machine can reach 4000m/min, while that of cemented carbide is only 1/4. In terms of service life, PCD CNC bending machine molds can generally be increased by 20 times. From the perspective of the processed surface quality, the effect of PCD is 30-40% better than that of cemented carbide. In addition, the development of CBN (Vertical Boron Nitride) superhard material CNC bending machine molds and surface coating CNC bending machine molds have also contributed to the advancement of cutting technology.

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