Hardware pattern is strong reduce the clearance effect to stamping workpiece quality

One, develop the idea that dismisses clearance
Strong cut clearance into parts to point to the clearance between punch point and sunken model point.
Z is normal: Fluctuation micro-crack coincide.
Have the branch of unilateral clearance and bilateral clearance.
2, strong cut clearance into parts to be opposite the influence of punch
1, the clearance influence to section quality
Normal: Fluctuation crackle coincide, brightness brings up, collapse horn, burr, taper is small, exterior level off;
Too big: Fluctuation crackle not coincide, tear off pull, thick, brightness heads section small, collapse taper of horn, thorn is big;
Too small: Fluctuation crackle not coincide, happen 2 times to cut, form the 2nd shining band, burr is big;
Not all: Clearance appears smally at the same time feature of small quality section, clearance appears greatly at the same time feature of quality of big gap section.
2, the clearance influence to dimension precision
Because stretch metabolic exists, strong flexibility appears to restore after reducing an end, make dimension and punch-die point size produce dimension deviation, and flexibility is out of shape size and strong cut clearance into parts to have immediate concern.
Clearance changes
Punching falls makings
Clearance increases
The metal suffers pull degree to increase stretch reply to make work measure increases upcountry (hole size) metallic drawing is spent increase, measure of stretch reply work is reduced (next work measure) .
Clearance decrescent
Rate of metallic press press increases, hole size reduces a metal to suffer internal pressure degree to increase, work measure increases.
3, the effect that clearance reduces force to rushing
Developing the rule of shadow part of the day that reduces clearance to reduce force to rushing is clearance smaller, be out of shape composition of stress of area internal pressure wades big, play stress part smaller, material is out of shape fight force to increase, strong reduce force bigger. Conversely, gap is bigger, be out of shape stress part is played inside the area bigger, be out of shape fight force to reduce, strong reduce force small. When clearance amounts to the 5%-20% with thick material, strong cut force into parts to drop not apparent.
When the 15%-20% that increases material ply when unilateral clearance Z, stripping force is 0.
4, the clearance influence to mould life
Because there is grinding presence between sidewall of workpiece and protruding, sunken model, space is little, grind big, mould life is brief. Strong in reducing a process, punch and by punching hear, sunken model and fall makings a powerful person all has attrition, and hear unoccupied place smaller, attrition is more serious. Too little space is very so adverse to mould life, and bigger gap can make the attrition between the flank of punch and sunken model and material is reduced, well can the influence with slow down inhomogenous clearance, improve the life of the mould thereby.
5, what reasonable clearance is worth is affirmatory
Of clearance choose should make rush cut the section quality with be achieved better, taller dimension precision into parts, rush lesserly reduce force, taller mould life.
Reasonable clearance shows a limits is worth, the biggest reasonable gap, the least reasonable space. Clearance is to consider afore-mentioned impacts of each elements integratedly surely really, choose to ask unoccupied place limits serves as reasonable clearance appropriately. Its upper limit is the biggest reasonable hear unoccupied place, floor level is  of the least reasonable space namely what reasonable clearance points to is value of a limits. When its body designs a pattern, the specific requirement that goes up according to workpiece and production can press following principle to undertake choosing:
(When the section quality when workpiece does not have L) to ask strictly, to raise a pattern life is mixed reduce strong reduce force, can choose bigger gap value.
(2) reachs production public errand when workpiece section quality lesser clearance value should choose when the demand is higher.
(When 3) computation develops measure of day of the blade that reduce a standard, wear away mediumly in use process considering the mould can make blade day clearance increases, ought to be calculated by Zmin value.
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