Stretch when deep drawing stamping design several points needing attention
Stretching deep drawing parts in the design and production to consider many factors, such as drawing coefficient, to have the limit of the material, the decision of the spring force, the direction of the stretching, is drawing up or down the stretch, can not be a forming, even after many attempt, to achieve the ideal result;
Designer team to summarize experience, let little author easy to popularize the knowledge: 1.
Stretch material, when a customer on the material is not very demanding, repeated trial mode can not meet the requirements, you can try again in the tensile properties of a kind of good material, good material is half of success.
Mold surface finish, carries on the deep drawing, the two sides of the die and blank holder ring grinding is not sufficient, especially in deep drawing of stainless steel plate and aluminium plate, are more likely to produce deep drawing scar, serious when tensile instability.
Blank size, blank design to correct positioning, simple rotator shape stretching pieces of blank diameter in the same thin stretching, although the thickness of the material have change, but very close to the original thickness, basic can according to the blank area and tensile area (
If there are trimming and trimming allowance)
The principle of equal to calculate.
Stretching coefficient, stretching coefficient is one of the main process parameters of stretching process calculation, often use it to decide the order of the tensile and the number of times.
Drawing oil, the choice of lubrication effect between die and workpiece, also can avoid artifacts rip.
In order to ensure the abrasion resistance and prevent stretching scratches, intensive and blank-holder circle must be quenched, can also be hard chrome plating, also can use TD surface treatment.
When necessary, can use tungsten steel for intensive.
The above article is derived from the metal stamping parts, automotive stamping parts processing custom 18 years (
Original, reproduced please indicate the source.
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