Main points of stamping and deep drawing of stainless steel plate
Antibacterial stainless steel sheets are widely used in the industrial processing field due to their excellent performance. However, the stamping performance of antibacterial steel sheets is weak, the surface of the board is easy to be scratched, and the mold is easy to form sticking lumps, which greatly affects the stamping quality and production efficiency. .
This also requires that the quality of the workpiece and the life of the mold can be increased from the perspectives of mold structure, mold material, heat treatment and lubrication when stamping antibacterial steel plates, which can better solve the problems existing in the stamping process of antibacterial steel plates.
The characteristics of antibacterial steel plate during stamping are high yield point and hardness, obvious cold work hardening effect, and easy cracking. Secondly, the thermal conductivity is weaker than that of ordinary carbon steel, which makes the required deformation force, punching force and deep drawing force relatively large.
In addition, the plastic deformation of the sheet will be severely hardened during deep drawing, and the thin sheet is prone to wrinkling or bottoming. The deep drawing die is prone to adhesion lumps, which causes serious scratches on the outer diameter of the parts. When deep drawing, it is more difficult to obtain the expected shape.
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So how can we solve the problem of deep drawing of antibacterial stainless steel plate?
After analysis, the occurrence of the above problems actually depends on the performance of the stainless steel itself, that is, the performance of the raw materials, the structure of the mold and the stamping speed, the mold material, the stamping lubricant, and finally the arrangement of the process route.
First, let’s talk about the quality factor of the raw material stainless steel plate.
Be sure to purchase regular raw materials that meet the national standard. If it is a hard material, annealing must be done in the stamping process to enhance the processing performance.
The second is the structure of the mold and the stamping speed.
In order to reduce the difficulty of deep drawing, the blank holder surface of the blank holder can be made oblique. In this way, under the action of the blank holder ring, the blank will be in complete contact with the blank holder surface and the die during deep drawing, so that the material at the fillet of the die can bear a relatively high blank holder force.
The punching speed when stamping antibacterial stainless steel is 1/3 smaller than that of carbon steel, and practice shows that the effect of using a hydraulic press is far better than that of a mechanical punch.
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Which 304 stainless steel sheet has the best tensile properties
The 304 stainless steel series are commonly used for drawing materials 304DQ 304DDQ 304DDQS, these tensile properties are very good.
The grade of 304 drawing material produced by Balford.:
0Cr18Ni9DQ, 0Cr18Ni9DDQ, 0Cr18Ni9DDQS.
Implement standard Q/TB3084-2010, the highest elongation rate can reach 68%
The content of sulfur and phosphorus of 304DQ series stainless steel drawing material is lower than that of ordinary 304, and other chemical components are basically the same. In terms of mechanical properties, the minimum elongation requirement of 304DQ is greater than 55%.
How to improve the machining accuracy of stainless steel thin-walled parts
For solid solution treatment, the temperature should reach about 1080 ℃, and the front should be kept for about 3 minutes, and then quenched. Toughness will increase substantially, but hardness will decrease accordingly. The reason for the rapid cooling is to cross 500-800 ° C, which is the sensitization temperature of stainless steel, and the texture of stainless steel will change at this temperature. If the solid-melting treatment can be done in a gas protection environment, the effect is the best, and there will be no oxide scale on the surface. (bright solid melting)
Elongation of stainless steel plate
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Elongation mainly measures the plastic properties of stainless steel sheets – that is, the ability to permanently deform without breaking.
- δ=(L-L0)/L0*100%
- δ—elongation
- L0—-The original length of the sample
- L—-The length of the sample after tensile fracture
Sheet Tensile Test
Tensile testing of sheets is also called uniaxial tensile testing or simple tensile testing. Using the tensile test method, many test values for evaluating the stamping properties of the sheet can be obtained, so the application is very common.
