What are the reasons for the chip blockage of die stamping parts and what countermeasures should be taken?

The causes of chip blockage in stamping parts and the corresponding countermeasures are as follows:

1) the leakage hole is small, which can increase the leakage hole gap;

2) The leakage hole is too large, and the leftover material rolls, so the leakage hole is modified again;

3) The blade is worn and has big burr, so it needs to be repaired;

4) If the oil drops are too fast and sticky, you can control the amount of oil drops and change the oil type;

5) The surface of the straight edge of the concave die is rough, and the powder is sintered and attached to the edge, so the surface roughness can be reduced or the material can be changed through surface treatment and polishing;

6) If the material is soft, modify the blanking gap;

Emergency measures include:

Trim the end face of the punch blade into an inclined plane or an arc (pay attention to the direction), and use a vacuum cleaner to aerate the blanking hole of the backing plate.

What is the reason for the deviation of blanking size when stamping the die?

What countermeasures should be taken?

The main reasons and corresponding countermeasures of blanking size deviation are as follows:

1) The knife edge of the convex-concave die is worn, resulting in burrs (too large in shape and too small in inner hole), so it is necessary to study the knife edge;

2) If the design gap is improper, modify the design and control the machining accuracy;

3) The punch and die inserts at the blanking position are offset and the gap is uneven, so the position accuracy and blanking gap can be adjusted;

4) The guide pin is worn and the pin diameter is insufficient, so the guide pin can be replaced;

5) The guide piece is worn, and the guide post guide sleeve can be replaced;

6) The feeding distance of the feeder has not been relaxed and adjusted, so the feeder is readjusted;

7) Adjust the clamping height improperly, and readjust the clamping height;

8) The material level of the stripping insert is worn, and there is no material pressing (strong pressing) function or small punching caused by pulling and turning. The stripper insert can be ground or replaced, and the pressing function can be added to adjust the pressing material;

9) The blanking insert is pressed too deeply and the punching hole is too big, so it is necessary to adjust the die to reduce the pressing depth;

10) mechanical property variation of stamping materials (unstable strength elongation) requires replacement of materials and control of feed quality;

1 1) The blanking force causes the dimension change of the material traction force, so the inclined plane or arc can be trimmed on the end face of the punch blade to improve the stress state during blanking, or the guide function can be added to the stripper insert at the blanking position.

7 What are the reasons for blocking materials in the process of die stamping and what countermeasures should be taken?

The main reasons and corresponding countermeasures of material blocking in stamping process are as follows:

1) The feeding distance of the feeder is not properly adjusted and needs to be readjusted;

2) The feeding distance of the feeder needs to be adjusted due to different feeding distances in production;

3) The feeder fails and needs to be adjusted and maintained;

4) When the material is arc-shaped, the width is out of tolerance and the burr is large, the material should be replaced to control the feeding quality;

5) abnormal die stamping causes sickle bending, so as to eliminate the sickle bending of the material belt;

6) the diameter of the pilot hole is insufficient, and the pilot hole is studied by drawing with the upper die;

7) If the bending or tearing position is not smooth, adjust the force of demoulding spring, etc.

8) The discharging function of the guide plate is improperly set, and the guide plate is modified to prevent the material from being taken away;

9) In the feeding process, when the material is thin and warped, it is necessary to add a downward pressing material between the feeder and the mold, and add a downward pressing safety switch;

10) The mold is not erected properly, which has a large deviation from the verticality of the feeder and needs to be erected again.

What are the causes of sickle bending in die stamping and what countermeasures should be taken?

The main reasons and corresponding countermeasures for the bending of the material belt sickle in the stamping process are as follows:

1) drilling burr (especially on the carrier), so it is necessary to study the cutting edge;

2) When the material is raw material and the die is not trimmed, the material needs to be replaced and the die is added with an trimming device;

3) If the drilling depth is inappropriate (too deep or too shallow), readjust the drilling depth;

4) The stamping parts are crushed and there are chips in the die, so it is necessary to clean the die to solve the problems of chip jumping and crushing;

5) Local pressing is too deep or parts are damaged locally. Check and adjust the height and size of each stripper and die insert to study the damaged part;

6) The design structure of the die is unreasonable, and the whole bending mechanism can be used for adjustment.

9 What are the reasons for the fracture and edge collapse of the punch during stamping, and what countermeasures should be taken?

The main causes of punch fracture and edge collapse in the process of stamping and the corresponding countermeasures are as follows:

1) the chip skips the blocking die;

2) Improper feeding, cutting half material, paying attention to feeding, trimming the material belt in time, and cleaning the mold in time;

3) The strength of the punch is insufficient, so the design is modified to increase the overall strength of the punch and shorten the straight edge size of the die. Pay attention to the slope or radian of the edge end face of the punch, and cut a small part back;

4) The distance between the big punch and the small punch is too close, which causes the small punch to break, so that the length of the small punch can be shortened by more than one material thickness compared with the big punch;

5) The local corners of the punch and die are too sharp, so the design is modified;

6) If the stamping gap is too small, control the machining accuracy of punch and die or modify the design gap, and appropriately increase the stamping gap of fine parts;

7) If there is no stamping oil or the used stamping oil is volatile, you can adjust the amount of stamping oil drops or change the type of oil;

8) Uneven offset of blanking gap, interference between punch and die, check the accuracy of each molded part, and adjust or replace it to control the machining accuracy;

9) The precision of the demoulding insert is poor or worn, and the precision guiding function is lost, so it needs to be studied or replaced;

10) The die guide sleeve is not worn normally, so it is necessary to replace the guide post guide sleeve and pay attention to daily maintenance;

1 1) The material and hardness of the punch are improperly selected, so it is necessary to change the material and use the appropriate hardness;

12) The guide (pin) is worn and needs to be replaced;

13) The gasket is improperly added and needs to be corrected. The number of washers should be as small as possible and steel pads should be used. The gasket under the female die should be placed under the block.

What are the causes of product deformation or dimensional variation during bending of 10 continuous die, and what countermeasures should be taken?

The causes and corresponding countermeasures of product deformation or size change when the die is continuously bent are as follows:

1) The guide pin is worn and the pin diameter is insufficient. Replace the guide pin;

2) The bending guide part is worn due to poor accuracy, and should be re-ground or replaced;

3) The bending punch is worn (crushed) and reground or replaced;

4) The place given by the mold is not enough, so check and correct it;

5) The material slips, the bending punch has no guiding function, and no preloading is applied during bending, so the design can be modified to increase the guiding and preloading functions;

6) If the die structure and design size are poor, measures such as modifying design size, decomposing bending and increasing bending forming can be taken;

7) When the burr of stamping parts leads to poor bending, it is necessary to study the cutting edge at the punching position;

8) More gaskets are added to the punch and die at the bend, which leads to unstable dimensions and requires adjustment of the integral steel gasket;

9) When the material thickness, size or mechanical properties change, it is necessary to change the material to control the feeding quality;

1 1 what are the reasons for the uneven surface of the product when there are multiple dies in the continuous die, and what countermeasures should be taken?

The main causes of uneven product surface and the corresponding countermeasures are:

1) blanking burr, study the cutting edge of blanking position;

2) Stamping parts are crushed, and there is waste in the mold. Clean the mold to solve the problem of waste floating;

3) The punch (bending position) is crushed or damaged, and new parts are researched or replaced;

4) Turn over the material when punching and shearing, study the punching edge, and adjust or increase the pressing function;

5) Check, repair or replace the wear and pressure loss of the relevant pressure parts;

6) The tearing and cutting dimensions of the relevant tearing and cutting positions are inconsistent, and the blade is worn, so it can be repaired or replaced to ensure that the tearing and cutting conditions are consistent;

7) The pre-cutting depth of the relevant fragile parts is inconsistent, and the die is worn or cracked. Check the status of pre-cutting die and implement maintenance or replacement;

8) Check the state of the punch and die, and repair or replace them if the punch and die of the relevant protruding part have broken edges or serious wear;

9) If the mold design is defective, modify the design, increase the height adjustment or increase the molding station.

12 what are the main reasons for improper stamping maintenance of dies and what countermeasures should be taken?

The main reasons for improper mold maintenance and the corresponding countermeasures are:

1) The mold has no foolproof function, and the assembly direction is misplaced due to negligence (referring to different stations), so the mold is modified to increase the foolproof function;

2) If the insert deviating from the gap is not repaired as it is, it should be marked on the mold, and the protective tape should be checked and confirmed after assembling the mold, and written records should be made for easy inquiry.

In stamping production, the daily maintenance of the die is very important, that is, daily attention is paid to checking whether the punch and die are in normal state, such as refueling the supply guide rail of stamping oil. Many unexpected accidents can be avoided by checking the mold before it is put on the machine, checking the blade and confirming the locking of each part. You must think twice before you repair the mold, make records carefully and accumulate experience.

13 what is the main reason for repairing the blanking die?

There are many reasons for mold repair in production, mainly in the following aspects:

(1) Natural wear and tear of stamping die parts, including wear of positioning and guiding parts, loose die handle, loose punch on fixed plate, enlarged gap between punch and die, and blunt cutting edge.

(2) Improper manufacturing process, mainly due to the poor material of the die, insufficient quenching hardness, inverted taper of the convex-concave die, insufficient precision and rigidity of the guide part after the installation of the convex-concave die, and eccentricity of the central shaft.

(3) Improper stamping operation: the bottom surface of the die is not parallel to the workbench of the press, the working center of the press is not coincident with the working center of the die, the punch enters the cutting edge of the die too deeply, and the failure in the operation of the press and the careless operation of the punch cause the die to be damaged.

What are the maintenance principles and steps of 14 blanking die?

The basic principles of mold maintenance are:

1) The exchanged parts must meet the technical requirements of the drawings.

2) The fitting accuracy, dimensional accuracy and intact degree of each part of the mold must be thoroughly checked.

3) After maintenance, mold testing, adjustment and acceptance must be carried out.

4) The maintenance time of the mould should meet the requirements of production.

The steps of mold maintenance are as follows:

1) Before maintenance, the mold should be cleaned to remove oil stains and sundries.

2) Check the benchmark positioning size and clearance fit of each part of the mold, record the defects at any time and make a repair plan.

3) Determine the parts that need to be disassembled, and repair them according to the plan of the maintenance card after taking them out.

4) Reassembly, adjustment and die test. If the original quality and accuracy cannot be restored, it needs to be trimmed again.

15 what are the main contents of temporary repair of stamping die?

Temporary repair of stamping die refers to adjusting the die on the machine without folding the die or only folding the parts to be repaired. Mainly includes the following aspects:

(1) Replace with spare parts

(2) Polishing the blunt edge of the convex-concave die with an oilstone.

(3) Replace the spring rubber and tighten the loose screws.

(4) Fasten or weld the loose punch.

(5) Adjust the gap between the mold and the positioning device.

(6) Replace the injector with a new one. What are the common repair methods of 16 blanking die?

The repair process of commonly used words in blanking die is as follows:

(1) One way to grind a dull punch is to use an oilstone plus kerosene or a pneumatic grinding wheel. Another method is grinding with a plane grinder.

(2) When repairing the convex-concave die with a large gap, first check the gap with a block gauge of appropriate size. If the gap is not big, just sharpen the plane of the cutting edge and then trim it with an oilstone. If the gap is too large, first use oxygen-acetylene gas welding to heat and forge locally. For the blanking die, the periphery of the female die should be tapped to ensure the size of the male die; for the blanking die, the male die should be tapped to ensure the size of the female die. When the tapping extension size is uniform, tapping can be stopped, but internal stress can be eliminated by heating for a few minutes. After cooling, the gap can be readjusted by indentation file repair, and the flame surface is quenched.

(3) grinding convex and concave dies with uneven clearance,

In addition to natural wear, there are the following two situations:

1) The cylindrical pin is loose and loses its positioning ability, which makes the male and female dies not concentric and causes uneven clearance. The alignment of the cutting edge of the punch die should be restored evenly, and then fastened with screws to expand the original pin hole by 0. 1~0。 2mm, repackaged as non-standard cylindrical pins.

2) The guide device is worn, the accuracy is reduced, and it can't play a guiding role, so that the punch and the die are relatively offset. It is necessary to chrome-plate the surface of the guide post, and then polish it with the guide sleeve until the original fit clearance and accuracy level are restored.

(4) Replace the micro punching and blanking punch.

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