Stainless steel stretch parts
The material of stainless steel tensile parts is generally 430 / 201 / 301 / 304 / 316 / 316L / 321, etc. each material brand has a detailed classification according to the element content. For example, 201 material is divided into low copper, medium copper and high copper. The tensile strength of stainless steel is getting stronger and stronger from low to high. Due to the strong tensile strength of stainless steel, its tensile performance is lower than that of carbon steel tensile plate, so it is higher than that of carbon steel in terms of tensile process
in the forming process of stainless steel stretching parts, first let the products form with the die, and then control the cooling of the heat generated in the stretching process. If possible, the upper and lower dies can be cooled at the same time. Generally, the upper and lower parts of the processed workpiece can be coated with stretching oil, especially the bottom surface, that is, the contact surface between the workpiece and the die, can also be coated with stretching oil, because most of the heat is generated on the die in the stretching process, This is the cooling mode of single station die processing. If it is a continuous die, the cutting emulsion can be placed between the material rack and the feeder to let the material belt slide through it, or the drawing oil can be applied on one side. The drawing oil can not only cool the die, but also protect the die, greatly reduce the wear of the die and increase the finish of the workpiece surface
there are many reasons for wrinkling of stainless steel tensile parts in the drawing process. The main reasons are as follows:
(1) the drawing scale of stamping parts is too deep, resulting in too fast sheet flow and wrinkling in the process of feeding
(2) the R angle of the die is too large during the drawing process of the stamping part, resulting in the punch unable to press the material during the drawing process, resulting in too fast sheet flow and wrinkling
(3) the pressing bar of stamping parts is unreasonable, the pressing bar is too small and the position is incorrect, which can not prevent the sheet from flowing too fast and forming wrinkles
(4) the pressure of the ejector rod is too small, so that the stamping parts are not formed thoroughly and wrinkle is formed
(5) unreasonable die positioning design leads to the inability to press the material during the drawing process of stamping parts, or the pressing edge is too small, resulting in the inability to press the material during the drawing process, resulting in wrinkling
(6) the gap between male and female dies is too large, which makes it impossible to press the material during stretching, resulting in wrinkling
cracking sometimes occurs in the drawing of stainless steel stamping parts. There are four common phenomena, namely, after drawing deformation, immediately after exiting from the die, when impacted or vibrated after drawing deformation, and for a period of time after drawing deformation or in use. The lateral or point cracking defects of the side wall of stainless steel stamping parts may be caused by the intergranular defects of materials such as inclusions and ferrite, or by the drawing process and drawing oil in the processing of stainless steel stamping parts
(1) improve the purity of the material and reduce the content of inclusions in the stainless steel material matrix
(2) the actual effect is to reduce the content of ferrite in the matrix of stainless steel by using the main component design and hot and cold rolling annealing process
however, due to the inevitable existence of these two manufacturing defects in the production process of stainless steel materials, appropriate process measures can also be taken to reduce or avoid the cracking caused by inclusions or ferrite defects in the processing of stamping products such as thermos cup and pressure cooker liner:
(1) change the forming method from thin drawing to equal thickness drawing
(2) increase the drawing passes, increase the fillet radius of the die and reduce the deformation difficulty of the material
(3) appropriately increase the viscosity of the drawing oil, promote the uniform deformation of the material, and avoid excessive stress concentration
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