Practical Sheet Metal Stamping Process Atlas. Volume 1

Author: Chief Editor: Liang Bingwen
Publisher:
Publish Date: 2003-08-01
Features: Selected from a wealth of domestic and international materials over the years. From the processability of sheet metal stamping to formulating stamping forming plans, to selecting economical and practical dies and forming devices, this is all advanced technology and craftsmanship. It lists various forming methods available for parts of the same type, depending on different production volumes and quality requirements, as well as the various sheet metal stamping parts that can be processed by a single machine. Production units can select the most suitable processing method based on their current manpower, equipment, and processing targets. This book primarily uses diagrams with minimal text explanations, making it valuable for workers, technicians, and students in technical colleges and universities engaged in sheet metal stamping.
Excerpt:
Figure 1a shows a punch with a short working part and diameter d1, which punches into the sheet material only to the depth where it can fracture. Figure 1b uses a punch with a slightly smaller diameter (d2 < d1) to push out the fractured scrap. Figure 1c uses a slightly larger punch (d3 > d1) to deburr the hole. For high production volumes, a continuous die can complete the three processes. For low production volumes, the drilling method replaces processes in Figure 1a and 1b, followed by deburring. Figure 2 shows a non-circular hole, which can first be drilled with different-sized drills to leave a relatively uniform deburring allowance, and then deburred to form. (F.Strasser)
4.4 Tube Wall Punching
Figure 1 shows a tube end punching device. The die is pressed into the cross shaft, which is fixed in a support block reinforced with strengthening plates. (R.J.Phillip)
Figure 2 shows that when punching a hole with a diameter of about 10 mm on a tube with a diameter of about 20 mm, a general die is not needed. The tube is inserted into two clamping blocks, and when the inclined wedge descends, it clamps the tube between the two blocks to perform the punching. If the tube material has a large diameter tolerance, the inclined wedge can have a certain degree of elasticity. (R.J.Phillip)
4.5 Tube Wall Grooving
Figure 1 shows a tube wall grooving die, which uses a shaft with a grooved opening slightly smaller in diameter than the tube's inner diameter as the die. The grooves have a slight inclination, narrower at the top and wider at the bottom, which facilitates waste material removal. The groove depth is about three times the thickness of the tube wall. The punch also has a slight inclination at the bottom. The shaft should be short and have sufficient rigidity. (F.Strasser)
Figure 2 shows a tube material grooving die, where the punch is a long rod that can pivot up and down on the shaft. The tube material is placed on the rod and positioned by a stop. When the upper die descends, the rod's end head, acting as the punch, grooves the die. When the upper die stroke is large, the upper die only contacts the rod near its upper and lower extremities. (F.Staudenmaier)
Figure 3 shows a tube material grooving die, where the punch has a V-shaped end that improves the quality of the grooves at both ends more effectively than a general V-shaped punch. (C.Mclaughlin)