Company News

• 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