Big Metal Profiles Bending Machinery Pressing
Bending processing refers to the process of forming workpiece steel by bending machine. Large bending processing refers to the process of bending and forming large workpiece by large bending machine to change the Angle of plate or plate. Such as bending the plate into V shape, U shape, etc. For example, the U rib of bridge, drainage gutter of building, lamppost of large square park, 5G signal tower pole, automobile girder and other products seen in daily life are all bent by large bending machine.
When bending steel plate, due to the high yield point of steel plate and other products, high hardness, cold hardening effect is significant, some problems need to be paid attention to when it is processed;
1. Due to poor thermal conductivity than ordinary low carbon steel, low elongation, resulting in the required deformation force;
2. Steel plate material has a strong springback tendency when bending compared with carbon steel;
3 steel plate relative to carbon steel due to low elongation, bending workpiece bending Angle R is greater than carbon steel, otherwise there is the possibility of cracks;
4. Because of the high hardness of steel plate, cold hardening effect is significant, so in the selection of bending tool to choose heat treatment hardness should reach 60HRC or more tool steel, its surface roughness is an order of magnitude higher than the carbon steel bending tool.
5. Under the unit size, the thicker the plate, the greater the required bending force, and with the increase of plate thickness in the selection of bending equipment bending force should be larger, stainless steel due to thermal conductivity than ordinary low carbon steel, low elongation, resulting in the required deformation force;
6 unit size, the greater the tensile strength, the smaller the elongation, the greater the required bending force, the greater the bending Angle should be, relative to carbon steel the same plate thickness of stainless steel bending Angle is larger, this point should pay special attention to otherwise there will be bending cracks, affecting the strength of the workpiece;
7. In the case of plate thickness and bending radius corresponding to the design drawing, according to experience, the expansion size of a bending workpiece is the addition of right-angle edges minus two plate thicknesses, which can fully meet the requirements of design accuracy. The calculation of expansion amount according to the empirical formula can simplify the calculation process and greatly improve the production efficiency;
8. The greater the yield strength of the material, the greater the amount of elastic recovery, in order to obtain bending parts of 90 degrees of Angle, the smaller the Angle of the press knife is required to design, steel plate in bending relative to carbon steel there is a larger elastic recovery deformation, so the press knife Angle is relatively small carbon steel.
Large bending machine is mainly used for equipment shell, construction machinery cantilever beam, non-standard structural parts, equipment frame, sheet metal parts, all kinds of pipe fittings, logistics equipment frame and other large steel plate bending processing services. The processing products are mainly used in electronic semiconductor, heat exchange equipment, port heavy industry, Marine equipment, heat treatment equipment, environmental protection equipment, steel structure steel beam, mining equipment, automobile collision beam, mechanical equipment and other industries。
How to bend and process large curved steel plate parts?
The metal plates of the chassis and cabinet are usually right-angled or non-right-angled. There is also a sheet metal parts can bend larger rounded corners, that is, bending arc sheet metal parts. Our commonly used bending die is 90 degree bending die, then how to use circular steel plate to bend sheet metal?
Obviously, the first method is to make a bending die with a curved arc. Find a professional mold manufacturer to make a set of bending molds. For example, once the R10's arc die is finished, clip it to a bending machine and bend it 90 degrees. The advantages of this method are: simple bending, simple program, good bending effect and high efficiency. The disadvantage is that special molds need to be customized. If R10 or R15 has two bending modes, two sets of molds need to be customized, and the mold cost is high. Relatively large arcs are not suitable for custom molds, such as R100 molds. How much is it to customize a set of molds? Molds cost too much.
Method of bending the arc of sheet metal
So, how do you bend a great arc?
This method should be beneficial to the development of modern CNC machine tools. At present, CNC bending machining generally has the function of bending arc. How does this work? In simple terms, it is to use an ordinary 90 degree die, with program control, one by one to complete the processing of the large arc. The arc length of the great arc is relatively long, and its size far exceeds the accuracy of the CNC bending machine. CNC bending machine adopts multi-position bending to complete the whole bending of large arc length. Similarly, the Angle control of CNC bending machine is also very accurate. Large arc Angle bending is completed by a number of small Angle bending. At this point, it's not very intuitive. The scene curve is clearly visible.
This method solves the problem of large arc bending of metal plate and regrets the power of technology. This method also has disadvantages: according to his principle, when bending a large circular arc, the number of bending is less, and there will be obvious creases. The more times you bend, the less efficient you will be. In addition, if the control accuracy of some machine tools is not high, the bending Angle or bending size will be deviated, which requires high precision CNC machine tools. If, in order to process some large arc sheet metal parts, we should choose a good CNC bending machine.
