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In the process of design and production of automobile stamping dies, not only must practically meet the technical requirements of body parts, but also attach great importance to the mechanical equipment, operation methods, transportation methods, and mold installations used in the design and manufacturing process. and waste disposal issues.
1. Factors Considered in Stamping Die Design And Manufacturing
In the process of designing and manufacturing automotive stamping dies, the first factor to consider is its price, which will affect the final sales of the product.
The level of automobile safety factor is usually determined by stamping dies, therefore, the quality of stamping dies will also directly affect product sales.
In the process of automobile stamping die design, humanization is also an important factor that should be considered, and attention should be paid to its maintenance and repair so that the partial replaceability of the die can be reflected more strongly. For those parts with a relatively high replacement frequency, higher standards should be set in the design process, which is extremely beneficial to both the supply and purchase ends.
- Raw Materials
Usually alloy steel or alloy cast iron.
In mold production, precision will directly affect the degree of fit between parts after assembly, as well as the presentation of gap consistency.
2. Automotive Stamping Die Maintenance And Repair
Due to the harsh working environment of automotive stamping dies, during use, the working parts, fitting parts, and sliding positions are often worn or even damaged. At the same time, due to factors such as complex mold design and manufacturing process, high precision, long cycle time, and high cost, it is necessary to repair problems in time during use, so as to ensure accuracy and improve service life. Although the maintenance and repair of automobile stamping dies are very complicated, there are mainly the following seven situations for frequent failures and maintenance methods:
- Flanging Deformed
In the process of flanging and shaping, the deformation of the workpiece often occurs, especially the deformation in the surface part, which has a great impact on the quality of the workpiece. The general solution is to increase the pressing force. If it is a spring-pressing material, the method of adding a spring can be used. For the upper air cushion pressing material, the method of increasing the air cushion force is usually used; if there is still local deformation after increasing the pressure, it is necessary to Find out the specific problems, check whether there is a local depression on the binder surface, etc. At this time, the method of welding and repairing the binder can be used; after the binder is welded, it will be researched and matched with the lower surface of the mold.
- Edge Chipping
This is one of the most common problems that occur during the use of molds. If the chipping of the knife edge is very small, it is usually necessary to grind the chipping edge larger with a grinder and weld it with the corresponding welding rod to ensure that the welding is firm and it is not easy to chip again.
It mainly occurs in processes such as drawing, forming, and flanging. To compare the workpiece to find the corresponding roughening position of the mold, push it smoothly with an oil stone, pay attention to the uniform size of the rounded corners, and then polish it with fine sandpaper.
- Trimming and Punching Tape
Due to the abnormality of the pressing or unloading device of the mold during trimming or punching, the trimming and punching carry material. At this time, it is also necessary to find the corresponding part of the mold according to the position of the part. If there is any abnormality in the mold pressing stripper, repair the welding of the pressing plate. If there is no problem with the mold-pressing stripping plate, you can check the mold knife block Whether there is a hair-pulling phenomenon.
- Continuous Waste
Because the operator did not clean up the waste in time during the production process, the accumulation of waste was caused, and finally, the waste knife was broken under the pressure of the upper trimming knife block, resulting in the continuous cutting of waste. The method of its repair is similar to that of edge trimming and chipping.
Due to the gap between the cutting edges of the mold, the burr is too large when the workpiece is trimmed, punched, and blanked. When the gap is large, the trimming and punching process adopts the method of trimming the die without moving the punch, and in the blanking process, the method of trimming the die without changing the die is used. If the gap is small, it should be adjusted according to the size of the mold gap to ensure a reasonable gap. For the trimming, and punching die, the method of placing the gap in the die is adopted, while for the blanking die, the method of enlarging the punch should be adopted, so as to ensure that the size of the part remains unchanged before and after repair.
- Clogged Punching Waste
The punching waste is blocked due to the non-smooth waste path, the reverse taper of the waste path, and the waste not being cleaned in time. To ensure that both the A and B sides are in a smooth and equal-diameter state, it is possible to ensure that the waste will not be blocked.