Limit size of the convex pitch and convex margin, Table 1-21 Limit dimensions of the convex pitch and the convex margin. Figure 1-21 Bending form of press brake machine. For ordinary low carbon steel plates, rust-proof aluminum plates, brass plates, copper plates, etc., the inner radius 0.2 is no problem. The pull riveting means that the riveting member is plastically deformed under the action of external tension during the riveting process. Note: All holes should be punched out once when using the values in this table. As shown in Figure 1-31, the oblong hole is too close to the fold line. The die is generally include: press-in type, inlaid type. This is also the case with rivet screws and rivet nuts, which are not suitable for use on stainless steel sheets. Introduction to Solidworks Sheet Metal for Technology Page 6 Flat-Pattern Feature This is added below the base flange feature. For brittle materials, tearing is likely to occur after punching, and particularly in the case of a small width, tearing is likely to occur. The rounded corners of sheet metal bends should be selected with a small bend radius as much as possible, which is beneficial to improve the accuracy. Note: This table is suitable for hole punching after blanking. Piercing and blanking of other shapes are desirably as simple and uniform as possible. Besides the material is required to have good plasticity. Mainly used for various deep drawing and bending force parts, its conductivity is not as good as copper, but it has better strength and hardness, and the price is relatively moderate. Otherwise, the bending knife will hit the flange. For the countersunk head of the countersunk screw, if the plate is too thin, it is difficult to ensure the via d2 and the counterbore D at the same time, and the via d2 should be preferentially guaranteed. Concave, counterbore, small stretch, etc. To improve the rigidity of the part, only by changing the material and the shape of the part can a certain effect be achieved. After the surface activated and purified strip is cooled to a temperature slightly higher than the molten zinc, it enters the zinc pot at 450-460 °C. The above 2), 3), and 4) steel plates are collectively referred to as coated steel sheets and are widely used in communication equipment. When the number of holes in the two rows is not equal, two requirements must be met: 1. After the coated steel plate is processed, it can be no longer electroplated or painted. 1) Use common metal materials to reduce material specifications and control as much as possible within the company’s material manual; 2) In the same product, reduce the variety of materials and sheet thickness specifications as much as possible; 3) Under the premise of ensuring the function of the parts, try to use cheap materials, reduce the consumption of materials, and reduce the cost of materials; 4) For the cabinet and some large plug boxes, it is necessary to fully consider reducing the weight of the whole machine; 5) In addition to the premise of ensuring the function of the parts, it must also be considered that the stamping performance of the material should meet the processing requirements to ensure the rationality and quality of the processing of the products. Very interesting and informative reading material for all skill levels. The round holes should be selected according to the series of round holes specified in the sheet metal mold manual. The same for the riveting, the bottom hole is too large, so that the effective friction between the two pieces after plastic deformation is reduced, affecting the quality of the riveting. The machining is mainly based on the shape of the workpiece. 10/10 well done. Material that is too thick has the same problem: molten metal scatters the beam before the part is fully cut. Arc welding can be used. Figure 1-22 Bending and rebounding diagram. For stainless steel and high carbon steel sheets, because of the hard material, a special high-strength rivet nut column is required, which is not only expensive, but also difficult to crimp, and the crimping is not reliable, and it is easy to fall off after crimping. When designing a stretched product, it is clearly stated on the drawing that the external dimensions or internal and external dimensions must be guaranteed, and the internal and external dimensions cannot be marked at the same time. The lower mold is generally V=6t (t is the material thickness). Features: high processing accuracy, but low processing speed, high cost, and will change the surface properties of the material. CNC punching generally cannot achieve piercing and blanking with too complicated shapes. Selection principle of sheet metal materials, Introduction of several commonly used plates, The influence of materials on sheet metal processing, The process design of piercing and blanking, 1.4 Structural Form of Nuts and Screws on Sheet Metal Parts, Comparison of rivet nuts, self-clinching nut, riveting, and hole flanging & tapping, Common stretch forms and design considerations, When marking the relevant dimensions of the curved part, consider the processability, Uniformity of the size of the counterbore of the countersunk head rivet, Special treatment of thin-plates with countersunk head screws, Steel plate, copper plate, aluminum plate, Processing minimum size (normal cold rolled steel plate), Minimum distance between hole and hole, hole and edge, Preferably the distance between the holes and holes, holes and the edges, Smooth outer edge, a layer of scale on the cut end face, Stamped concave text with deeper symbols; size is limited by the mold. 2) The hole size reference of the stamping part should be selected as far as possible from the beginning to the end of the stamping process, and should not be associated with the part participating in the deformation. 5) The minimum width of the upper die of the bending machine is 4.0mm (current). There are two main types of commonly used copper and copper alloy sheets, copper T2 and brass H62. Combined with the minimum die width above, the formula for obtaining the shortest bend edge is ②: (see Figure 1-25). The minimum corner radius between adjacent walls of the rectangular tensile parts should be r3 ≥ 3t. Such a semi-cutting concave, the deformation is much smaller than the normal stretching, but there is still a certain deformation for a large-area cover plate and a bottom plate which are not bent or have a small bending height.
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