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Die stamping problem and corresponding solution introduction
Source: | Author:pmoba96f3 | Release time:2018-12-13 | 289 Browse: | 分享到:
In the stamping production of progressive die, it is necessary to carry out specific analysis for the phenomenon of poor stamping, adopt effective treatment measures, and fundamentally solve the problems that occur, so as to reduce production costs and achieve smooth production. The following are the reasons for the common bad stamping phenomenon in production and the treatment measures are as follows, for the mold maintenance personnel to refer to.
1. punching edge
 (1) Reason: a, the knife edge wears; b, the effect is not obvious after the gap is too large to repair the knife edge; c, the knife edge collapse angle; d, the gap is unreasonably up and down offset or loose, the mold is up and down. (2) Countermeasures: a, grinding the cutting edge; b, controlling the precision of the convex and concave die machining or modifying the design clearance; c, grinding the cutting edge; d, adjusting the punching clearance to confirm the problem of the hole wear of the template hole or the processing precision of the molded part; e, replacement guide Piece or re-form. 
 2. Spike crushing

(1) Reason: a, the gap is too large; b, improper feeding; c, the stamping oil droplets are too fast, the oil is sticky; d, the mold is not demagnetized; e, the punch is worn, and the scrap is pressed onto the punch; f, The punch is too short, the length of the inserted die is insufficient; g, the material is hard, the punching shape is simple; h, emergency measures.

(2) Countermeasures: a. Control the accuracy of the convex and concave die machining or modify the design clearance; b. Trim the tape and clean the mold when it is sent to the appropriate position; c. Control the amount of oil in the stamping oil, or change the oil to reduce the viscosity; d, After the training, the magnet must be demagnetized (more attention should be paid to the iron); e, the punch is cut; f, the length of the punch is adjusted into the die; g, the material is changed, and the design is modified. The punch is bladed into the end face to mount or trim the bevel or arc (note the direction). Reducing the bonding area of the end surface of the punching edge and the chip; h, reducing the sharpness of the edge of the die, reducing the grinding amount of the die edge, and increasing the roughness (covering) of the surface of the straight edge of the die, Use a vacuum cleaner to absorb waste. Reduce the speed of rush and slow down the swarf

3. Chip blockage

(1) Reason: a, the leakage hole is small; b, the leakage hole is too large, the material is tumbling; c, the knife edge is worn, the burr is large; d, the stamping oil droplet is too fast, the oil is sticky; e, the concave mold is straight The surface of the blade is rough, the powder is sintered and adhered to the blade; f, the material is soft; g, emergency measures.
(2) Countermeasures: a, modify the leakage hole; b, modify the leakage hole; c, blade repair knife; d, control the amount of oil, replace the oil; e, surface treatment, polishing, pay attention to reduce the surface roughness during processing Change the material, f, modify the punching clearance; g, the end face of the punching blade is trimmed with a slope or an arc (note the direction), and a vacuum cleaner is used to add air to the blanking hole of the pad.
4. Cutting material deviation size variation
(1) Reason: a, the convex and concave die edge wear, resulting in burrs (larger shape, smaller inner hole); b, improper design size and clearance, poor processing accuracy; c, lower punch and die insert Equal offset, uneven gap; d, guide pin wear, insufficient pin diameter; e, guide wear; f, feeder feed distance, press material, loose adjustment improper; g, mold closed mold height adjustment; h, The material of the unloading insert is worn, and the function of non-pressing material (strong pressure) is small (the material is pulled by the material to cause small punching); i.
(2) Countermeasures: a, grinding the cutting edge; b, modifying the design, controlling the machining accuracy; c, adjusting the positional accuracy, punching the gap; d, replacing the guiding pin; e, replacing the guiding column, the guiding sleeve; f, re-adjusting Feeder; g, re-adjust the mold closing height; h, grind or replace the discharge insert, increase the strong pressure function, adjust the pressure; i, reduce the strong pressure depth; j, replace the material, control the feed quality; k, punch The end face of the blade is trimmed with a slope or an arc (note the direction) to improve the stress during the punching. When the license is applied, the loading part is placed on the unloading insert to provide a guiding function.
5. Card material
(1) Reasons: a, feeder feeding distance, pressing material, loose adjustment improperly; b, variation in the delivery distance during production; c, feeder failure; d, material arc, width is too wide, large margin; e, The die is abnormally stamped, and the boring tool bends; f, the guide hole diameter is insufficient, the upper die pulls; g, the bend or the tearing position is not smooth; the h, the material strip is not properly set, the strip is stripped ;i, thin material, sent to the middle warp; j, mold erection is not appropriate, and the deviation from the verticality of the feeder is large.
(2) Countermeasures: a, re-adjustment; b, re-adjustment; c, adjustment and maintenance; d, replacement of materials, control of feed quality; e, elimination of material belt bending; f, training and punching positive hole convex, concave mold ;g, adjust the strength of the stripping spring; h, modify the guide plate, the belt on the anti-material belt; i, add the upper and lower press between the feeder and the mold, add the upper and lower squeeze safety switch; j, re-lay the mold.
6. Belt with a sickle bend
(1) Reasons: a, stamping burrs (especially on the carrier); b, material burrs, mold without trimming; c, improper punching depth (too deep or too shallow); d, stamping damage, swarf in the mold Material; e, partial pressure is too deep or partial pressure to the part; f, mold design.
(2) Countermeasures: a. Repair the cutting edge; b. Replace the material, add the trimming device to the mold; c, re-adjust the depth of the punch; d, clean the mold to solve the problem of chipping and crushing; e, check and adjust each The height of the unloading and die inserts is correct, and the damage is repaired; f. The whole bending mechanism is used for adjustment.
7. Punch breakage
(1) Reasons: a, jumping chips, blockage of jams, jamming, etc.; b, improper feeding, cutting half of material; c, insufficient strength of the punch; d, the size of the punches are too close, the material is towed during punching, Inducing small convex die breaks; e, convex and concave molds are too sharp corners; f, blanking clearance is small; g, no stamping oil or used stamping oil is more volatile; h, punching gap is uneven, partial Move, convex and concave mold interference; i, unloading insert accuracy or wear, loss of precision guiding function; j, mold guidance is not allowed, wear; k, convex, concave mold material is improperly selected, hardness is not good; i, guide Material (pin) wear; m, gasket is improperly installed.
(2) Countermeasures: a. Resolve problems such as chipping, chip blocking, and card mold; b. Pay attention to feeding, trim the tape in time, and clean the mold in time; c. Modify the design, increase the overall strength of the punch, and shorten the die. Straight blade size, pay attention to the edge of the convex blade to repair the slope or arc, the small part is cut later; d, the length of the small punch is shorter than the thickness of a large punch; e, modify the design; f, control the convex and concave Mold processing accuracy or modify the design gap, the small part of the punching gap is appropriately increased; g, adjust the amount of stamping oil drip or replace the oil; h, check the accuracy of each forming part, and apply adjustment or replacement to control the processing accuracy; , repair or replace; j, replace the guide post, guide sleeve, pay attention to daily maintenance; k, replace the use of materials, use the appropriate hardness; i, replace the guide parts; m, correction, the number of gaskets can be less, and use steel pads The under-die gasket needs to be placed under the spacer.
8. Bending deformation size variation
(1) Reasons: a, the leading pin is worn, the pin diameter is insufficient; b, the bending guide part is inferior in accuracy and wear; c, the bending convexity, the concave die wear (pressure loss); d, the mold yield is insufficient; Material sliding, bending convex, concave mold without guiding function, no preloading when bending; f, poor mold structure and design size; g, punching edge, causing poor bending; h, bending part More punches are added to the punch and the die, resulting in dimensional instability; i, material thickness and size variation; j, material mechanical shape energy variation.
(2) Countermeasures: a, replace the guide pin; b, re-grind or replace; c, re-grind or replace; d, check, correction; e, modify the design, add guide and pre-press function; f, modify the design size , Decompose the bend, increase the bending and shaping, etc.; g, repair the cutting edge of the material level; h, adjust, use the integral steel pad; i, replace the material, control the feed quality; j, replace the material, control the feed quality.
9. The height of the punching piece (when more than one piece)
(1) Reason: a, burr of the punching piece; b, crushing of the punching piece, chipping in the die; c, convex or concave die (bending position) pressure loss or damage; d, turning over during punching; , relevant wear parts wear, pressure loss; f, the relevant tearing position tearing size is inconsistent, the knife edge wear; g, the relevant easy to break position pre-cut depth is inconsistent, the convex and concave mold has wear or chipping; h, the relevant convex part convex and concave The mold has chipping or wear is more serious; i, mold design defects.
(2) Countermeasures: a. Repair the cutting edge of the material level; b. Clean the mold to solve the floating problem of the scrap; c, re-train or replace the new one; d, repair the punching edge, adjust or add the strong pressure function; e, check, Perform maintenance or replacement; f, repair or replace, to ensure that the tearing condition is consistent; g, check the pre-cut convex and concave mold conditions, implement maintenance or replacement; h, check the convex and concave mold conditions, implement maintenance or replacement; i, modify Design, add high and low adjustments or add plastic working stations.
10. Improper maintenance
(1) Reasons: a. The mold has no foolproof function, and the negligence of the mold group leads to the reverse direction and misalignment (referring to different stations); b. The insert that has been offset by the gap is not restored as it is. (2) Countermeasures: a. Modify the mold, increase the anti-stay function; b. Make a mark on the mold, and make necessary inspections and confirmations after the mold is set, and make a written record for inquiries.