A common fault processing of stainless steel stampings
1, adhesive, scratches: due to the friction material and punch or concave die in parts or die surface bad;
2, burr: mainly happens on the shear modulus and blanking die, blade clearance between big or hours will produce burr;
3, the line displacement: forming parts, the first contact with the mould parts of the squeezed and formed a line;
There's a foreign body in 4, convex concave: uncoiling line (
Iron filings, rubber, dust)
With cause convex concave;
5, twists and turns: due to the uneven stress, drawbead matching bad or press the slider control bad parts r Angle parts or embossed parts causing twists and turns, strain;
6, wrinkles, due to poor press slide block adjustment, low precision press, air cushion and inappropriate pressure adjustment, punch or caused big edge or r r parts of wrinkles.
Other specific issues: in the daily production, will meet punching size small or large,
Possible beyond specification)
And the punch size is large, in addition to consider the design of the forming of convex and concave die size, machining accuracy and blanking clearance and other factors, also should consider the following several aspects to solve.
Cutting blade wear, material by tensile stress increases, stamping parts produced material, distortion tends to increase.
Produce double way, punching size will be small.
Crush of material, make the material produces plastic deformation, can lead to punching size is big.
And reduce pressure, punching size will be small.
Punch edge end shape.
Such as end slope or arc, due to slow down the blanking force, salt pieces not easily get turn, twist, therefore, the punching size is big.
And punch end plane (
No cant or arc)
When the punching size is relatively small.
Inhibition of stamping double material and torsion method (1).
Reasonable die design.
In the progressive die, blanking order arrangement is likely to affect the precision of the stamping forming.
For stamping fine blanking parts, general arrangement of large-area first cutting blanking, then arrange the punching blanking of smaller area, in order to reduce the cutting force of the influence of the stamping forming.
To overcome the traditional mould design structure, open capacity on the stripper plate material clearance (
The mold closed, and material can be pressure.
Key to forming part, stripper plate must be making set piece of structure, to facilitate solving caused long time stamping produced material parts on the stripper plate mill (
Loss, and can't pressure material.
Add crush functions.
To discharge set piece of material of pressure increasing size,
Normal discharge with pieces of thick H + 0.
To increase the pressure on the concave side material, thus inhibiting the punching stamping double material and torsion deformation.
Punch edge end fix the bevel or arc.
This is an effective way to slow down the blanking force.
Slow down the blanking force, can reduce the tensile force of the concave side material, thus suppressing stamping double material and torsion effect.
Daily mold production, should pay attention to maintenance of convex and concave die cutting edge sharpness.
When cutting blade wear, material by the tensile stress will increase, and stamping parts produced material, distortion tends to increase.
Cutting clearance is not reasonable or uneven clearance is also produce stamping parts material, the reason of the distortion, need to be overcome.
A: on the development of the stainless steel in our country