1 Introduction The bottom plate of an appliance part is shown in Fig. 1. In the production process, multiple processes are required to complete the forming process. In the first production process, the punching and flanging are divided into two processes, and there are 7 M3mm and 4 months M4mm internal threads. Holes, punching, punching, punching, punching, machining, and product quality are not stable. The quality of the parts directly affects the quality of the whole machine. In order to improve product quality and increase production efficiency, it is necessary to improve the product production process to meet production requirements. 2 Parts, punching and flanging process analysis The part is shown in Figure 1. The material is A3 cold-rolled plate, material thickness t = 0.8mm. After the forming process, the surface is painted and treated. The part is relatively large and complex and is a typical type. Home appliance structural parts require multiple processes to complete the forming process. In order to reduce the difficulty of mold processing, make full use of the company's existing equipment, combined with the actual processing capacity, after research and analysis, determine the parts of the processing process as follows: 1 blanking; 2 punching I (redundant cooling holes) 3 punching II (rushing Installation holes and flange pre-punching); 4 punching flanges; 5 tapping; 6 bending I; 7 bending II; 8 riveting fixed column; a total of 8 processes to complete the parts forming process, this is a A common stamping process method. In the production process, the quality of the flanged part of the part is poor, and incomplete holes are often generated in the 11 flanged holes. This results in unqualified parts and requires tapping after the hole is turned over. When the flanged hole is incomplete , screw hole teeth are not complete. At the same time, tapping processing is manual operation, the labor intensity of the workers is large, the production efficiency is low, and the quality of tapping is unstable, which is also an important source of unstable product quality. 3 punching and flanging process analysis When the punching and flanging is divided into two processes, the punching and flanging of the pre-punching (small holes) after punching, complete the flanging in the next process, when the flanging pre-punching and turning When the concave die hole is not concentric, the flanged hole will be incomplete after the flanging due to the large size of the part and the thin plate. After the blanking, the part has been bent or distorted. When the edge flanging, flanging is bound to occur. The phenomenon of punching and punching holes in the die hole is different, resulting in hole breakage. After research and analysis, it is believed that the punching and flanging are completed in a single process, so that the phenomenon of hole crushing of the flanging hole can be avoided. The working process is that the punch punches the punching hole first, and the punch continues to feed a short period. Then complete the hem. It is ideal for machining on hydraulic machine tools and punching can be done on punching machines. On the punching machine, using the characteristics of the punching machine, the pre-punching is completed near the top dead center of the punch slider, and the bottom dead center of the punch slider is used to complete the flanging. The pressing material is realized by a spring, and the bottom of the slider is stopped. The point of maximum spring pressure, the press can carry the largest pressure. In order to change the machining process of tapping, it was decided to use a triangular self-tapping screw instead of a machine screw. Triangular self-tapping screws are characterized by: matching the bottom hole, the use of screw on the screw teeth, under the action of the locking force, the screw cut into the hole, so that the screw lock, while the screw can be tapped in the hole Complete thread. In this way, the tapping process can be eliminated, so that the processing quality of the parts is changed from the manual operation control to the mold processing control, so as to rationalize the processing technology. After the process is improved, the original process 3, 4 can be combined on a pair of molds, and the process 5 is cancelled. After the change of processing procedures are: 1 blanking; 2 punching I (redundant cooling hole); 3 punching II (red hole and punching hole); 4 bending I; 5 bending II; 6 riveting fixed column; A total of six processes are required to complete the parts processing. 4 mold design The mold is punching 2 process, punching with two round holes to locate, the process a total of round holes 7-Φ2.6mm, 4-Φ3.3mm, 2-Φ3.5mm, 2-Φ5mm, 24- Φ5.4mm, 2-Φ6mm, 2-Φ8mm, 6-Φ11mm, round hole 2-10.6mmx12mm, square hole 4-3mm·2mm, punching flange is 7-Φ2.6mm, 4-Φ3.3mm, due to The mold has a large appearance and must be installed in a punch press of more than 60t. The mold is punched and punched by the punching and punching compound mold structure. The mold structure is shown in Figure 3. All punched punches are machined according to the part size. The die is equipped with a unilateral gap of 0.03-0.O4mm. The punching and flanging punches (see Figure 4) have a working part dp of Φ2.6mm. Φ3 for M3mm and M4mm. 3mm, effective length> 6mm, with the discharge plate (guide role), unilateral gap of 0.01 ~ 0.O2mm, pre-punching diameter do respectively taken to be Φ1.4mm, Φ1.6mm, flange die (see Figure 5 shows that the diameter is taken as Φ3.9mm, Φ4.6mm; the length of the punching flange punch is 3-5.5mm longer than that of the punch punch. If the punch tonnage is large, take a large value. In order to reduce the discharge pressure, the method of reducing the pressing area is used to achieve the punching die, the punching and punching die adopts the insert structure, the die is quenched with the die steel, the die fixing plate is ordinary The steel plate A3 can be, the female die is fixed on the female die fixing plate, the insert female die is 0.5-1.5 mm higher than the female die fixed plate, and the discharge plate is tempered with medium carbon steel.
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After mold processing is completed, it is verified by the trial mold that the mold is qualified and the product meets the design requirements. The height of the M3mm hole flanging can reach 1.9mm, and the height of the M4mm hole flanging can reach 2.1mm, which can meet the requirements for use of the self-tapping screws.
5 mold characteristics, work process
(1) The main features of the mold.
The die punching and punching flanging are designed on a pair of dies, and the holes are concentrated on a pair of dies (mainly mounting holes), which is easy to operate and simple, and improves the machining accuracy of the parts. If it is desired to reduce the inner R angle of the burring hole, that is, the verticality of the burring, only by changing the fitting gap of the punching lamella die can be achieved.
(2) mold work process.
In this process, two circular holes were used for positioning. Place the parts on the die and use the pins on the sides to position them roughly. Put the two round holes in the part into the positioning pins. The pins use tapered pins for precise positioning. The press slider is pressed down. Under the spring pushing, the stripper plate presses the workpiece on the concave die surface. The slider continues to press down. The punch punching the punched edge begins to punch the punching hole, and the slider continues to press and turn the edge. The punch starts squeezing the material into the burring die and completes the flanging as soon as the bottom dead center is reached. When the flanging is about to be completed, all the punch punches start punching, and the punching is completed (or punched) at the bottom dead center. When the punch slider is lifted, the spring pushes the stripper plate and removes the workpiece by punching the punch. The reset is completed and the punching machine completes a working process.
6 Conclusion
The die punching and punching are completed in a single process, and the machine screw is changed to a self-tapping screw, which realizes no cutting processing, reduces the labor intensity of workers, improves the production efficiency, reduces the production cost, and makes the product The appearance of the quality is improved. The mold has been mass-produced for many years, and the practice has proved that the mold structure is reasonable, the operation is reliable, the production operation is simple and convenient, and each batch of production tasks can be successfully completed, creating significant economic benefits for the company, and the process method is Other product development has been effectively promoted and applied.