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Application of high strength steel in bending machine
2022 / 05 / 30
Application of high strength steel in bending machine When the high-strength steel is bent by the free bending method on the CNC bending machine, various defects are produced due to the sheet properties, equipment status, bending process parameters and other factors, which reduce the production efficiency and cause economic losses. In this paper, the main defect types of high strength steel under free bending are analyzed, and the corresponding improvement measures and countermeasures are put forward. Bending cracking When the R angle inside the bending is small to a certain value, the longitudinal material outside the plate may have cracks or microcracks at the R angle of the bending part due to excessive deformation, as shown in Figure 1. At the early stage of trial production of high-strength steel bending parts, bending cracking defects occurred frequently, which not only caused waste of plates, but also affected the normal progress of the project. The main factors causing cracking of high-strength steel bending parts are as follows. Bending radius The ultimate bending radius to prevent the outer fiber from cracking is called the minimum bending radius. The minimum bending radius is related to the mechanical properties of the material, the fiber direction of the sheet, the surface and side quality of the sheet, and the thickness of the sheet. Generally, with the increase of the material strength, the plasticity will decrease, and the minimum bending radius that the material can adopt will be larger. Bend line positioning method During the bending process, the bending line needs to be positioned to ensure the accuracy of the bending parts. The traditional manual line positioning methods mainly include manual or laser marking positioning method, process gap positioning method and machine tool stop positioning method. In the process of bending trial production of bp500 plate, when the process notch posit
What are the types of stainless steel?
2022 / 05 / 30
There are many kinds of stainless steel, which can be divided into several types according to the organizational structure at room temperature: 1. austenite type: such as 304, 321, 316, 310, etc; 2. martensitic or ferritic type: such as 430, 420, 410, etc; According to the composition, it can be divided into CR system (400 Series), Cr Ni system (300 Series), Cr Mn Ni system (200 Series) and precipitation hardening system (600 Series). 200. series - chromium manganese nitrogen austenitic stainless steel 300. series - chromium nickel austenitic stainless steel 301 - good ductility, used for forming products. It can also be hardened rapidly by machining. Good weldability. The wear resistance and fatigue strength are better than 304 stainless steel. 302 - the corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content. 303 - it is easier to cut than 304 by adding a small amount of sulfur and phosphorus. 304 - 18/8 stainless steel. The GB brand is 0Cr18Ni9. 309 - better temperature resistance than 304. The second most widely used steel after 304 is mainly used in the food industry, pharmaceutical industry and surgical equipment. Adding molybdenum makes it obtain a special corrosion-resistant structure. Because it has better chloride corrosion resistance than 304, it is also used as "marine steel". SS316 is usually used for nuclear fuel recovery devices. Grade 18/10 stainless steel generally meets this application grade. [1] Model 321 - other properties are similar to 304 except that the risk of weld corrosion of the material is reduced due to the addition of titanium. 400. series - Ferritic and martensitic stainless steels. 408 - good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni. 409 - the cheapest model (British and American), usually used as automobile exhaust pipe, is ferritic stainless steel (chro
What are the main functions of the bending machine?
2022 / 05 / 30
The plate bending machine is a shaping machine for continuous point bending of sheet metal. When the ordinary symmetrical three roll plate bending machine is used for plate bending, dead edges of a certain width will be left at both ends of the sheet metal. In this way, after being rolled into a cylinder, the pre bending function is to remove the dead edges and form a cylinder. There are many straight edges at both ends of the workpieces rolled out by the bending machine, which need to be welded and then rolled, which takes time and reduces the work efficiency. Main components of the bending machine: (1) Upper and lower rollers of the plate bending machine: it is an important part of the plate bending machine, and the material is forged carbon steel. (2) Plate bending machine frame: it is divided into left and right frames, each of which is equipped with a lower roll bearing. There is a square screw rod inside the frame, and the upper end of the screw rod is hinged with the bearing seats at both ends of the upper roll. Worm gear pair and screw pair are installed at the lower part. Rotate the nut in the worm gear to make the upper roll up or down. (3) Reducer: zsy280 hard tooth surface reducer is installed on the channel steel base together with the booster. (4) Unloading device of the plate bending machine: installed at the side of the reducer to balance the upper roll during unloading; Unloading and recovery are completed by the oil cylinder. (5) Base: welded by profile steel and steel plate. Install the frame, reducer, motor, etc. on it to form a whole. (6) Electrical part: all installed in a control box for easy operation. The electric control system of the bending machine consists of an electric control cabinet and an operation console. Power supply 380v/50hz. The main switch has the functions of short-circuit protection and overload protection of the main motor. The forward and reverse rotation
What are the safety technical measures and maintenance of the plate shears?
2022 / 05 / 30
The machinery manufacturing industry often needs to use CNC plate shears. What are the safety technical measures for CNC plate shears? In machining production, plate shears are widely used as a kind of shearing equipment, which can shear various thickness steel plate materials. The commonly used plate shears are divided into three types: flat shear, rolling shear and vibrating shear, of which the flat shear is the most used. Most plate shears with a shear thickness less than 10 mm are mechanically driven, and those with a shear thickness greater than 10 mm are hydraulically driven. It is generally operated by foot or button for single or continuous metal cutting. Wuxi Shenchong feels that attention should be paid to: 1. before work, carefully check whether all parts of the plate shears are normal, whether the electrical equipment is in good condition, whether the lubrication system is unblocked, and remove the sundries such as tools, measuring tools and corner wastes on the table and around. 2. it is not allowed to operate the plate shears by one person alone. Two to three people should coordinate the feeding, control the dimensional accuracy and reclaiming, and determine one person for unified command. 3. the shear clearance shall be adjusted according to the specified shear thickness. It is not allowed to cut two plates of different specifications and materials at the same time, and it is not allowed to cut by stacking. The sheared plate shall have a flat surface, and it is not allowed to shear narrow plates that cannot be compacte
Five years of supply side reform giving birth to platinum in machine tool industry
2022 / 05 / 30
Five years of supply side reform giving birth to platinum in machine tool industry The essence of "supply side reform" is not to solve the oversupply we understand, but to solve the mismatch between supply and demand. After more than 30 years of rapid economic growth, many people have changed from low income and low consumption to medium and high income and medium and high consumption. According to the survey data of third-party institutions, China's middle and high-income people have exceeded 200 million. The general basic demand exists, but the change in income has also led to earth shaking changes in demand. People should not only consume, but also consume well. From having mobile phones to intelligent mobile phones; From TV to HD TV; From having air conditioners to pursuing low noise and energy-saving air conditioners; From ordinary train to bullet train; From driving to flying a private plane ----; The pursuit of better and higher consumer demand puts forward higher requirements for equipment manufacturing, and the higher requirements for equipment manufacturing are reflected in machine tools, that is, higher requirements for machine tools. Good products call for good equipment, and good equipment needs good machine tools. The core of supply side reform is to prepare for people's constant pursuit of better and higher demand. In recent years, a motorcycle parts enterprise in Chongqing has increased equipment investment, upgraded and transformed the existing equipment, introduced several medium and high-end CNC machine tools, and eliminated the original medium and low-end ordinary machine tools and low-end CNC machine tools. Enterprises carrying out equipment upgrading and transformation like this are not only in the motorcycle parts industry, but also in other industries, not only in Chongqing, but also in equipment manufacturing enterprises all over the country. However, not all equipment enterprises and industries are doing this. It i
Where is the way for China's machine tool industry to break through the siege?
2019 / 05 / 25
In the past two years, China's machine tool industry has indeed encountered challenges, but challenges and opportunities coexist. For the development of China's machine tool industry, the Chinese government and machine tool enterprises have also made efforts for it. As the saying goes, "only by applying the right medicine can the disease be cured". So where is the way for China's machine tool industry, especially high-end CNC machine tools, to break through? Where is the way to break through? At present, the global machine tool industry is still at a low point, and there is no obvious sign of industry recovery; However, the domestic machine tool industry shows three characteristics: the industry is in the imitation stage, the key core technology is hollow, and it is deeply mired in the middle and low-end market. Industry insiders said that the three key paths for the breakthrough of the domestic machine tool industry are to reduce the production capacity at the middle and low end, replace imports at the high end and enter the machine tool consumption market. Among them, the promotion of medium and low-end capacity removal depends on the cooperation of enterprises, local governments and the state. The resistance in this process includes the interest game of local governments' taxes and so on; In addition, personnel placement after capacity removal, as well as capital and R & D investment in high-end capacity, are also difficult problems to be solved. The replacement of imported high-end CNC machine tools is the biggest goal and opportunity for domestic machine tools at this stage. At present, some domestic enterprises such as RIFA precision machine, Yawei Co., Ltd., Shenyang Machine Tool Co., Ltd. and Guangzhou CNC have certain accumulation of high-end CNC machine tool technology and production and processing technology. There is a gap between domestic and foreign enterprises in processing accuracy and product stability. If the industrial
2019 / 05 / 25
With the popularity of the TV documentary "great country craftsman", the "great country craftsman" has become a well-known "hot word" to the public, and many well-known machine tool enterprises, such as CITIC Heavy Industry, Daguang evergreen, Baoji Machine tool, have emerged one after another. How to cultivate "big country craftsmen" in the machine tool industry? How can the public mention Chinese machine tool products in the same "awe" as Swiss watches and German machinery? Although the training of "big country craftsmen" involves many points and covers a wide range, it has still become a major focus of the development of the machine tool industry. It is urgent to forge the "craftsman spirit" and cultivate more "big country craftsmen" so that our manufacturing industry can win a place in the world. To improve the treatment of industrial workers and make them more respected and loved in the society, we need a fulcrum and platform, not just a paper article. The emergence of "chief worker" is an important fulcrum. "Chief worker" is a position specially set for key positions in the enterprise. The workers with this title are generally higher than other workers in the level of vocational skills, and have rich practical operation experience. Embedding the chief into the worker's identity is not only a concrete manifestation of respect for skills, but also an innovation in philosophy. At present, "made in China" is making great strides towards "made in China intelligently". The spirit of craftsmanship is particularly important for the machine tool industry, because mechanical equipment is made of hundreds of parts by hundreds of workers in nearly 100 enterprises. As long as one of the key processes goes wrong, the whole equipment will not work well. Indeed, according to the theory of "barrel benefit", the quality of a machine tool often depends on the key process of a part. However, the change of machine tool equipment made in China from "usable and
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