The mold repair information is available, where do I need to start the analysis? What kind of effect should I achieve?

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Basic points of mold maintenance
1. What are the reasons for burrs in die stamping parts and what measures should be taken? (Mainly for blanking punching and other work
Sequence)
1 Edge wear or corner...) Solution) quenching hardness is low, need to study knife edge.
2 the effect is not obvious after the cutting edge is studied and the machining precision of convex and concave die should be further modified or the clearance should be modified.
3 unreasonable clearance, up and down migration or loose, need to further adjust the punching clearance to confirm the template hole wear or molding accuracy and other problems.
The mold is misplaced up and down, and the guide parts need to be replaced or the mold needs to be reassembled.
2. What are the reasons why the die stamping parts are crushed?
What measures should be taken？
(1) When the clearance is large, the machining accuracy of convex and concave die is controlled or the design clearance is modified;
(2) If it is improper feeding to be sent to the appropriate position, trim the material belt and clean the mold in time;
（3） stamping oil drops too fast, oil dip, control stamping oil amount or change oil type to reduce viscosity;
(4) The mold is not demagnetized, but demagnetized after the study (pay more attention to the iron impact material)
(5). punch wear, chip material pressure attached to the punch, need to study the punch edge;
(6) punch is too short, insert the length of the die is insufficient, need to adjust the punch knife into the length of the die;
(7) material is hard, the punching shape is simple, can be in the punch knife into the end face into the ejection or repair the slope or arc, reduce the punch edge end face and the fitting area.

The emergency measures are: reduce the amount of research and study of the cutting edge of the die, increase the roughness of the surface of the straight edge of the die (covering), use a vacuum cleaner to absorb the waste, reduce the impact speed, slow down the jumping.
3. What are the reasons why die stamping parts produce cuttings and material obstacles? What measures should be taken?
1 waste hole is small, can increase the leakage hole clearance;
2 leakage hole is too large, waste rolling, re-modify the leakage hole;
3. The edge is worn, the burr is too large, and the edge needs to be studied;
4 stamping oil drops too fast, oil, can control the amount of stamping oil or replace seed;
5 The surface of the straight edge of the die is rough, and the powder is attached to the edge. The surface roughness can be reduced by surface treatment, polishing or changing the material;
6 the material is soft, show you the gap:
The emergency measures are: punch knife end face repair slope or arc (attention direction), the use of a vacuum cleaner, in the pad blanking hole home blowing.
4. What are the reasons for variation of material deviation size during die stamping and what measures should be taken?
(1) Convex and concave die edge wear, resulting in burrs (shape is large, the inner hole is small) need to study the edge;
(2) Improper design clearance, modify the design and control the machining accuracy;
(3) the blanking is the punch and the die insert, and the gap is uneven. The position accuracy and the gap can be adjusted.
(4) the pin wear, the pin strength is insufficient, and the pin can be replaced.
（5)Guide wear, can replace the guide pillar guide sleeve;
7. If the feeding distance of the feeder is not adjusted properly, adjust the feeder again;
8. If the height of the mold closing die is not adjusted properly, adjust the height of the mold closing die again;
9 the stripper inserts wear the pressure level, no pressure (strong pressure) function or by the material traction to turn over the material caused by small punching
) can grind or replace the stripper inserts, increase the strong pressure function, adjust the pressure material;
10. The stripper insert is too deep, and the punching is too large, so it is necessary to adjust the die to reduce the strong pressure depth; Mechanical property variation of stamping materials
(strength elongation is not stable) need to change the material, control the quality of the feed;
(11) the punching force causes dimensional variation on the material traction, which can be used to improve the force situation when the punch edge end face is trimmed out of slope or arc or the cutting part is located on the stripper insert.
5. What is the reason for clamping material when stamping the die, and what measures should be taken?
(1) The feeding distance of the feeder is not relaxed properly, and it needs to be adjusted;
(2) Variation of feeding data in production, the feeding distance of the feeder needs to be adjusted;
3. The feeder is faulty and needs to be adjusted and maintained;
(4) When the material arc, the width is out of tolerance and the burrs are too large, the material should be replaced to control the quality of the feed;
⑤ Die stamping abnormal cause scythe bend, eliminate the material belt scythe bend;
The feeding aperture is insufficient, the upper die drawing material, training guide hole;
⑦ Bending or tearing up and down, adjust the stripper spring;
8. The stripping function of the guide plate is not set properly, so the feeding plate and the anti-material belt are required.
9. If the material is thin and warping occurs during feeding, an upper and lower pressing material is added between the feeder and the die, and an upper and lower squeezing safety switch is added;
10 Improper mold addition, and the feeder perpendicularity deviation is large, need to add a new mold.
6, when the die stamping, the material belt sickle bending reason is what, what measures should be taken? The main reasons and corresponding countermeasures for the scythe bend of the material belt during the die stamping:
(1) Caused by stamping burrs (especially on the carrier), the cutting edge needs to be studied;
(2) The material needs to be replaced when the raw edge of the material and the die has no trimming, and the die is equipped with trimming device;
3, the depth of the punch is not proper (too deep or too shallow), the depth of the punch;
4. The punch piece is crushed, and there is scrap material in the die. The die needs to be cleaned to solve the problem of jumping and crushing;
⑤, the local pressing material is too deep or the local damage of the crushing position, check and adjust the height and size of the demateriation and the concave die insert block is correct, and study the damage position;
6.the mold design is not reasonable, can take the bending mechanism adjustment.
7. What is the reason why the die breaks and collapses when the die is punched? What measures should be taken?
The main reasons of punch fracture and edge collapse during die stamping and corresponding countermeasures:
①, jumping chip material blocking clamping mold;
②Improper feeding, cut half material, pay attention to feeding, timely trim the material belt, timely clean the mold;
③ punch strength is insufficient, modify the design, increase the overall strength of the punch, reduce the size of the straight edge of the die, pay attention to the punch blade section to repair the slope or arc, small parts after cutting;
④ the size of the punch is too close to each other, cutting material traction, causing small punch broken, can be small punch length grinding short relatively large punch a material thickness above;
⑤ punch and die parts are too sharp, modify the design;
⑥ the punching clearance is small, control the machining accuracy of the concave and convex die or modify the design clearance, the small part of the punching clearance is appropriately increased;
⑦, no stamping oil or the use of stamping oil volatile, can adjust the amount of oil drop stamping oil or replace the oil clock;
⑧ Uneven offset of the punching clearance, interference of the convex and concave die, check the accuracy of each molding part, and adjust or replace it to control the processing accuracy;
⑨ Mould guide and wear are not correct, guide posts and guide sleeves need to be replaced, and pay attention to daily maintenance;
(10) convex and concave die material selection is improper, hardness is improper, need to change the use of material, use suitable hardness;
(11), the guide (pin) wear, need to replace the guide;
（12) Improper addition of gaskets should be corrected. The number of gaskets can be as little as possible and steel gaskets should be used. The gaskets under the concave die should be padded under the gaskets.
8. What is the cause of product deformation or size variation when continuous die bending and what measures should be taken?
① Guide pin wear, pin diameter is insufficient, replace the guide pin;
② The bending inversion part of the accuracy of poor wear, regrinding or replacement;
③ bending die wear (pressure loss), need to regrind or replace;
④ Insufficient die concession, check and correct;
⑤ material slip, bending convex and concave die no guide function, bending to impose prepressure, can modify the design, additional guide and prepressure function;
⑥ mold structure and design size is bad, can be used to modify the design size, decomposition bending, increase shaping measures;
⑦ the punch burr, causing bad bending need to grind the cutting edge;
⑧ the bending part of the punch die die with more gaskets, resulting in instability of size, need to adjust the whole steel gasket;
⑨ When the thickness, size or mechanical properties of the material change, the material should be replaced to control the quality of the feed.
9. What is the reason why the surface of the product is uneven when the continuous mold has more than one mold? What measures should be taken?
①The burr of the punching piece, and the cutting edge of the material level;
② The punch is crushed, there is debris in the mold, clean up the mold, clean up the mold, solve the problem of debris floating;
③ the convex and concave die (bending) pressure loss or damage, regrinding or replace the new parts;
④ When blanking, it is necessary to turn over the material, study and learn the cutting edge, adjust or add the strong pressure function;
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⑤ Relevant cutting position and cutting size are inconsistent, knife edge is worn, repair or replace, and ensure the same cutting condition;
⑥ related material parts wear and pressure loss, inspection, implementation of maintenance or replacement;
⑦ the relevant easy to break the pre-cutting depth is not the same, the convex and concave die wear or collapse, check the pre-cutting convex and concave die condition, the implementation of maintenance or replacement;
⑧the relevant convex parts of the convex die collapse or wear is more serious, check the situation of the convex and concave die, and implement maintenance or replacement;
9, mold design defects, modify the design to add height adjustment or add shaping station.
10. What are the reasons for improper maintenance of die stamping and what measures should be taken?
The reasons for improper maintenance of molds and corresponding countermeasures are as follows:
(1) The mold has no anti-retardation function, and the negligence during mold setting leads to the dislocation in the opposite direction (referring to different working stations). Modify the mold and add anti-retardation function;
(2) If the insert that has offset the gap is not restored according to the original state, make a mark on the mold, and make necessary inspection and confirmation on the care belt after the mold is assembled, and make a written record for inquiry.
11. What are the reasons for the repair of the die?
① The natural wear of die parts, including the wear of positioning and guiding parts, the handle is loose, the punch is loose on the fixed plate, and the gap between the punch and the die becomes large and the edge becomes blunt;
② improper manufacturing process, mainly is the die material is not good, quenching hardness is not enough, convex and concave die taper, guide parts accuracy and rigidity is insufficient and convex and concave die installation center line eccentric;
③ Improper stamping operation: the ground of the stamping die is not parallel to the working table of the press, the working center of the press is not coevent with the working center of the punching die, the punch is too deep into the edge of the die, the failure of the press operation and the careless stamping workers who do not operate according to the regulations lead to the damage of the die;
12. What are the maintenance principles and steps of the die?
Maintenance principles are as follows:
① The parts exchanged must meet the technical requirements of the drawing;
② the mold parts of the mating accuracy, dimensional accuracy and intact degree must be a comprehensive inspection;
③ maintenance needs to carry out mold test, adjustment, acceptance;
④ The maintenance time of the mold should be suitable for the requirements of production;
13. The steps of mold maintenance are as follows:
① The mold needs to be wiped clean before maintenance, and take out oil and debris;
② Check the datum positioning size and clearance fit of each part of the mold, record the defects at any time and prepare the repair plan
③ Determine the parts to be disassembled and take out the mold according to the plan on the repair card;
④Reassemble and adjust and try the mold. If the original quality and accuracy cannot be restored, the mold needs to be repaired again;
14. What are the main contents of the temporary repair of the die?
① Use temporary reserve;
② Use the whetstone edge to grind the blunt edge of the convex and concave die
③ replace the spring rubber, shackled loose screw;
④ Tighten or weld the loose screws;
⑤ Adjust the clearance and positioning device of the die;
⑥ Replace the new topping device.
15. What are the commonly used repair methods for punching die?
① A method for grinding blunt convex and concave die is to use whetstone and kerosene or pneumatic grinding wheel to grinding. The other is to use a surface grinder grinding;
② repairs and clearance of intensive, with appropriate size detection intensive gaps, if the gap is not big, just sharpening edge plane with oil stone, if the gap is big, can first use oxygen - acetylene welding heating red, local forging, edge of punching die should knock around, in order to make sure the punch size, the blanking die should hit convex die, in order to make sure the die size. The tapping can be stopped after the extended size is even, but it is still heated for a few minutes to eliminate the internal stress, and then the gap is adjusted by embossing file repair method after cooling, and the surface is quenched with flame.
③repair the uneven gap of the convex and concave die, natural wear and the following two cases:
A. The cylinder pin loosens and loses its positioning ability, resulting in uneven clearance due to different cores of the convex and concave die. The cutting edge of the convex and concave die should be restored to uniform, and then tighten with screws. The original pin hole should be hinged by 0.10.2mm, and the non-standard cylindrical pin should be made again.
B, the guide device wear, the accuracy is reduced, can not play a guiding role, so that the convex and concave die relative migration. The surface of the guide posts should be plated with an inscription. Then grinding method and guide sleeve to recover the original fit clearance and reduce grade.
4, replace the small punching and blanking punch.