1. Punch before use should be paid attention to
(1), with a clean cloth, clean the punch.
(2) if there is a scratch, dent, view the surface. If yes, is removed by sharpening stone.
(3), timely oil rust.
(4) when installing the punch, careful not to have any tilt, available nylon hammer soft material, such as tool it is lightly, only after the punch right positioning can tighten bolts.
2. Installation and debugging of progressive die
Installation and calibration die must be especially careful. Because die especially large and medium punching die, not only expensive, but big weight trace difficulty moving, personal safety should always be in the first place. Infinite device of punching die between the upper and lower mold should add a cushion board. After the punch table clean, the clamping state to try the mold in mesa suitable location. Selected according to the requirements of process documentation and die design of press stroke, in the mold to the front to bottom dead center and greater than the location of the mould height 10 ~ 15 mm, adjust the slider connecting rod, the moving mould, ensure mold handle on die handle hole and achieve suitable loading height. General blanking die under the first fixed die (do not tighten) after fixed upper die (tight), linking piece T bolt are appropriate torque wrench tight (mould) should be used, to ensure that the same screw tied with a consistent and ideal additive clamping force. Can effectively prevent the occurrence of the manual screw thread caused by physical, gender, feel is error is too big or too small, the same thread pretightening pre-tightening force, leading to lower die stamping process change wrong move, clearance, chew strip edge failure, etc.
Test before sweeping lubrication of mould and prepare to normal production materials, in the empty trip started punching die mould operation is normal 3 ~ 5 times and try to rush. Adjust and control punch into the depth of the concave die, examine and verify die guide, feeding, shirk, side pressure and pressure etc and the device performance and operating flexibility, and proper adjustment, to the best technology condition. On the middle and small punch test respectively at 3, 5, 10 pieces to conduct early production, try again after qualified salt 10, 15, and 30 for the re-inspection. The line detection, blunt edge and burr inspection, all the size and shape, precision conform to the requirements of the drawings, production to delivery.
3. Stamping burr
(1), mold clearance is too large, or uneven, to adjust the die clearance.
(2), mold material and improper heat treatment, die cone or edge is not sharp, should be reasonable material selection, mold working parts materials with hard alloy, heat treatment method is reasonable.
(3) wear, stamping, grinding punch or insert.
(4), punch too deep into the concave die, punch into the cavity depth adjustment.
(5), the structure of the guide is not precise or improper operation, maintenance guide pin guide sleeve inside mould and punch guidance accuracy, standardize the press operators.
4. Jump waste
Die clearance is bigger, punch is shorter, the influence of the material (hard, brittle), stamping speed is too high, oil viscosity or oil droplets too attached to the role, pressing and vibration producing material spread crumbs, vacuum adsorption and die core is not sufficiently degaussing etc all can cause scraps to the mold surface.
(1), the degree of sharp edge. The rounded edge, the greater the more easy to cause waste, rebound, for material of thin stainless steel can adopt oblique edge.
(2), to compare the rules of waste, can increase the complexity of the waste or addition polymerization on the punch amine ester plunger, jump to prevent waste, increase scratches in die edge side.
(3), die gap is reasonable. Unreasonable mold clearance, easy to cause waste, rebound, 10% less for small diameter hole clearance, is greater than 50.00 mm in diameter, the gap enlarged.
(4), increasing the depth into the mould. Each station die stamping, into the modulus of the demand is certain, the modulus is small, easy to cause waste rebound.
(5), the surface of the processed material if there is oil.
6, adjust the stamping speed, stamping oil concentration.
All landowners, adopt vacuum adsorption.
Today, the punch, inserts, material for demagnetization.
5. Bruised, scrape
(1), strip or die with oil, scraps, lead to broken, need to wipe the grease and install automatic blower gun to remove scraps.
(2), mold surface is not smooth, we should improve the surface finish of the die.
(3), the surface hardness is not enough, the surface shall be chrome plated, carburizing, boriding processing, etc.
(4), the material strain and instability, reduce and smooth, increase the compressive stress, adjust the spring force.
(5), the mould of jump waste twenty.
6, homework product to mold positioning cause scratches or other place, need to modify or lower mold positioning, education workers take put down light when working.
6. The workpiece surface scratch after bending
(1), raw material surface is not smooth, clean, school plain material.
(2), molding the piece of waste, attle. Clearance between the blocks.
(3), molding piece is not smooth, will be molding pieces of plating, polishing, improving intensive finish.
(4), punch, bending radius R is too small, increasing the punch bending radius
(5), die bending clearance is too small, adjust the up and down mode curve fit clearance.
6, die forming block with roll forming.
7. Leakage punching
Punching, the condition of the leakage fault was found, generally have punch die after packing subsidence caused by such factors as the punch, punch to conduct first article confirmation after repairing mold, compared to the sample, check whether there are omissions phenomenon, on the sink of the punch, should improve the hardness of die plate.
8. Stripping is not normal
(1), stripper and punch with tight, stripper tilt, such as screw height not unified device is undeserved, or other materials should be finishing materials, stripping screw adopts the form of the combination of casing and inner hexagon screws.
(2) small, die clearance, punch when out of the material need lots of ejection force, punch was caused by material on, need to increase the lower die clearance.
(3) has a back taper, concave die, the trimming die.
(4), die blanking hole and the mold base hole not for leakage, finishing hole leakage.
(5), check the status of materials. Dirt attached to the mold material, make the punch was biting and will not be able to process the material. Buckling deformation of the material after punching, clamping punch, found that the buckling deformation of material, need to flatten again after processing.
6, punch and die edge passivation to grinding in a timely manner. Sharp edge of the mould can work out a beautiful cut surface, the blade is blunt, requires additional pressure, and rough workpiece cross section, produce very big resistance, grabbed the punch was stuff.
All landowners, appropriate USES the oblique edge punch.
Today, as far as possible to reduce wear and tear, improve lubrication condition and lubrication plate and punch.
Pet-name ruby, spring or rubber elastic enough or fatigue wear and tear, timely replacement of spring.
Attending, guide pillar and guide bush clearance is too large, repair or replace the guide pin guide bush.
Does, the parallelism error accumulation, grinding and assembling.
Thecountry, push on a piece of hole is not vertical, small punch deviation, repair or replace a piece.
Does, punch or guide pillar installation is not vertical, repackaging, guarantee the verticality.
9. Bending edge is not straight, size is not stable
1. Increase the pressure or pre bending process
(2). Material pressure force is not enough, increase the force that press a material
(3). Intensive rounded corner wear asymmetry or uneven bending stress, adjust the convex concave die clearance of uniform, polishing intensive rounded corners
(4) height not less than the minimum limit of size
10. Curved surface extrusion material thinning
1. Die fillet is too small, increasing the die fillet radius
(2). Intensive gap is too small, fixed convex concave die clearance
11. At the bottom of the hollow parts
(1). Material itself is not flat, leveling material
2). The roof and material contact area small or top material strength is not enough, need to adjust the lifter device, increase the lifter
(3). No top material in the die device, should increase the lifter device or correction
(4). Add plastic process
12. Stainless steel flange deformation
Before making flanging forming lubricant to the use of high quality material, this material to be able to make better separated from the mold, moving smoothly in mold surface during forming. So a better chance to give material distribution to be bent and is generated when the tensile stress, prevent the forming of flanging deformation of the hole side and flanging hole at the bottom of the wear and tear.
13. The material distortion
Cutting a large hole in the material, material flatness defects, the causes may be pressing stress accumulation. Punching a hole, the hole surrounding material is down the stretch, the plate surface tensile stress on the increase, down movement has also led to plate the surface compressive stress increases. For a small hole, the result is not obvious, but with the increase of number of punching, tensile stress and compressive stress also multiply until the material deformation.
One of the ways to eliminate the deformation is: every other Kong Chong cut, and then return to cutting the rest of the hole. It produce the same stress in the plate, but collapsed because of synthetic continuous punching and produce a followed by one tensile stress/pressure stress accumulation. It makes the first hole also split the effect of deformation of the second batch of hole.
14. The mould serious wear and tear
(1), timely replacement has worn mould components and punch.
(2), check whether the mould clearance is not reasonable (small), increase the lower die clearance.
(3), as far as possible to reduce wear and tear, improve lubrication condition and lubrication plate and punch. Oil and grease number depending on the processing material conditions. Cold rolled steel, corrosion-resistant steel plate material without rust scale, such as for mold filling, point injection for guide bush, mouth filling, lower die, etc. Oil with light oil.
Have rust scale materials, processing the rust powder inhalation between the punch and guide bush, dirt, make the punch can not slide freely within the guide bush, in this case, if the oil, make rust scale is more likely to touch on, so when this material, on the contrary to wipe off the oil, decomposition time per month, with gasoline (diesel) oil remove the punch and die under the dirt, again to clean before assembly. So you can ensure mold has good lubrication performance.
(4), the grinding method is undeserved, cause mould annealing, aggravate wear, should use soft abrasive grinding wheel, the small turning, adequate cooling fluid and often clear the grinding wheel.
15. Prevent stamping noise
Punching sheet metal processing industry is one of the most indispensable key equipment. Punch at work would produce stamping mechanical transmission noise, noise and air dynamic noise, the noise is high up to 125 db (A) significantly more than the standard provisions of the state of 85 db (A) and its noise index under the requirements, and thus to the operator and the surrounding environment (e.g., office, residential areas, meeting rooms, etc.) cause extremely serious harm and pollution. Effectively control the noise has become a problem presses for solution. Especially in our country the first implementation of the act of noise, the scale of the industrialization of environmental protection increasing, more accelerated the urgency of the noise control.
From punch noise source and the mould structure, to reduce noise must pay attention to the following:
(1), pay attention to mold maintenance, cleaning, keep sharp edge.
(2) the blade shape, quantity, material, mould and tangent length and mold parts and components interface is not too big, the punch ladder do oblique edge blanking, make the mold cutting depth is different in different locations, the true cut off the entire process, rather than synchronous crowded broken.
(3), mold parts must be installed perpendicular to the surface, and the blade fit clearance to reasonable, intensive unloading difficulty can increase the die clearance, increasing the discharge power, by adopting the method of soft unloading on the surface of the plate.
(4), the working template matching accuracy, processing some exhaust slot.
(5), check baffle to do small piece together, stripper, the template to insert type, decrease the fire area.
6, stripper play top source to T push rod, a spring loaded in the mold base, such as set with the plunger with, mould condition guarantee stripper is still a certain activity.
All landowners, keep good lubrication, die without interference, smooth.
Today, up and down the surface of the seat cushion aluminum plate force of the buffer.
Pet-name ruby, mould debugging good after, in press machine equipped with sound insulation cover board insulation treatment or sponge.
Attending, improve the punching accuracy, reduce noise. On the workbench install buffer damping noise reduction oil cylinder, gear, strengthening lubrication and equipped with bevel gear, pneumatic system equipped with muffler.
