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Chongqing Xicheng Hardware Manufacturing Co., Ltd.
Landline：023-42466988
Mobile phone：15909303966
Address：No. 7, Gusheng Road, Caojie Industrial Park, Hechuan District, Chongqing
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common problem |
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| Common problems and solutions of hardware mold commissioning and maintenance |
| Release time：2023/2/20 Source：Chongqing Xicheng Hardware Manufacturing Co., Ltd. Read：855Second |
In the process of debugging and maintenance, moulds often encounter various problems, which will seriously affect the delivery date of products and the service life of moulds.
The purpose of mold debugging is to find out the problems in the mold design and manufacturing process, so as to improve and correct the process defects in the original design, processing and assembly, and produce qualified products. Through die test and adjustment, the forming conditions and process procedures without providing products can be obtained, and the die quality and accuracy can be verified as the basis for delivery and production.
Precautions before mold test
1. The performance, brand and thickness of the test material should meet the requirements of the drawing. In the actual operation, it is often found that the mold commissioning personnel have no product drawing in their hands. In the future commissioning process, this phenomenon should be avoided.
2. The mold must be carefully checked before commissioning to prevent some unrelated products and parts from attaching to the mold and prevent mold damage. The mold must be fastened on the stamping equipment, and then adjusted after inspection. The above two points should be prepared before the mold is adjusted.
Common defects and solutions in mold test
1. The product has large burr
Causes: 1. If the bright band on the shear surface of the product is too wide, or even there are two bright bands and extruded burrs sometimes, it means that the gap is too small. If the bright band on the shear surface of the product is too narrow, the tread angle is large, and the entire section has a large inclination, resulting in fracture burrs, it means that the gap is too large. At this time, the blanking gap should be readjusted. Such problems are less likely to occur when finishing parts.
The uneven gap between the male and female dies will also produce burrs, and the material after blanking can be judged according to the uniformity of the bright band on the shear surface. In the actual debugging process, the burr phenomenon should be solved before debugging. The above phenomena can be found in the process of mold assembly. The problem of burr can be solved if the accuracy of die assembly and reasonable clearance blanking can be guaranteed. In addition, in the process of mold assembly, the engineering personnel should carefully check whether the blanking hole is enough, whether there is any missing processing, whether there is enough part of the displacement and whether there is any missing place, and should try to avoid spending time and energy to solve similar problems in the process of mold debugging. This is the basic ability and quality that a qualified engineering personnel should have.
2. Chip jumping and crushing
This is a big problem in mold debugging, not only in mold debugging, but also in daily production.
The root cause of chip jumping is the adsorption force between the scrap and the punch, the friction force between the scrap and the die, and the gravity of the scrap. In particular, the thin sheet is slightly punched, and the friction force between the material retained in the die and the die is small, which is easy to cause the scrap to move up. The specific reasons are mainly as follows:
A. When the gap between the punch and the die is too large, it is easy to cause the scrap to move up
B. Because the straight section of the die is too smooth
C. The straight section of the die is too good, the stored waste is too much, and the downward friction increases
D. The scrap does not fall smoothly and touches the parts under the die edge, causing fertilizer blockage
E. During sheet blanking, the shape of the blanking waste is large and thin, which is tightly adsorbed under the punch
F. Use high viscosity lubricating oil, which will cause adhesion due to high adhesion
G. The concave die edge is too sharp
H. The position and function of the discharge plate are not appropriate, and the gap between the discharge plate and the peripheral surface of the punch is uneven
I. In the process of mold processing and stamping production, magnetism is generated on the punch and adsorption is generated
There are many ways to solve the problem of waste moving up. The common methods are as follows.
1. During mold debugging, each part in each template must be demagnetized
2. During design, try to avoid the punching method with too simple shape
3. Reduce the length of the straight end face of the female die
4. The working surface of the punch shall be made into a convex or concave shape
5. If the waste is relatively large and the shape of the waste is relatively simple, the straight end of the concave die should be processed symmetrically to make two grooves with a slope of about 20 °, a depth of 0.015mm and a width of 1-1.5mm.
4. Adjustment of bending angle
The adjustment of bending angle mainly includes right angle, acute angle and obtuse angle. It is necessary to distinguish whether there is R angle at the bending point. For the adjustment of bending without R angle, the concave die does not need to be a sharp angle, and R0.1 fillet can be allowed between the test dies. This is due to the fact that a small round corner will naturally appear at the concave die after a little longer time in mass production. The main purpose of mold debugging is not to produce several qualified samples, but to take into account some problems that may occur during mass production. In many cases, we feel that debugging the mold is to deal with the sample, but not fully consider the mass production. Many problems can be solved in the process of debugging, but often many seemingly simple problems are found in mass production. This leads to a non-virtuous cycle of debugging and reviewing while producing. For right-angle bending without R angle, the line pressing method is the simplest and most useful, and it is also very stable in the production process. The line pressing width should be determined according to the material thickness and strength. For sharp angle bending without R angle, the relative distance dislocation of the front and back bending lines can be used for debugging. When the bending line is higher than the bending line, the internal stress of the material is destroyed by pre-bending. The bending adopts the method of reverse core pulling and floating die. The relative distance of the bending position used for pre-bending and bending should be determined according to the thickness and strength of the material. For obtuse bending without R angle, the springback of bending should be considered at this time. The springback of stainless steel should be relatively large, while that of brass, red copper, tinplate and other materials should be relatively small.
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