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外文翻译-冲压头断裂问题的解决方法英文-其他专业.doc

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外文翻译-冲压头断裂问题的解决方法英文-其他专业.doc

SOLVING PUNCH HEAD BREAKAGE PROBLEMS Punch fracture, especially in heavy stamping and high-speed press work during the compression cutting, is a serious problem. High-speed stamping process of rapid shear rate may make ordinary strength of cutting load increases to as close to the ultimate tensile strength. Figure 1. The stamping process compressed cutting operations happened. The factors to punch fracture High stripping load tends to head fracture. However, the single high stripping load cannot make head down. Peel strength depends on the amount of several factors. These factors include 1 and the type of handle mould thickness. 2 the use of lubrication. 3 the scratches on the press or stamping wear. 4 punch and stamping mould sharp degree. According to the different speed and working conditions, another punch fault model, is due to cap over Under pressure and heavy load caused by the reverse, especially in high-speed operation process and cutting thick billet is more serious when. Please note that the tensile strength, stripping may not be enough to cause by. The failure mode is usually the cyclical loading and crack propagation in failure. Figure 2 shows the failure of stamping part of start-up. Fig.2 punch fracture problem in the head and stamping agency usually start gradually add. Figure 3. Close observation of the head and stamping institutions to join. Figure 2 shows the hardened tool in the bottom of the stamping head locator. Normally, support plate heat 38RC toughness is to should be 45RC to the extent, see figure 3 close observation. In good design, punch and positioning circle should inevitably have a small round or clearance to accommodate punch in the corners of the mould at the extruding part. Punch bending and cracks As head of the metal stamping, cutting in stamping mould, support plate and generate sheath compressive strain. This will cause as shown in figure 4, namely the bending deformation or punching head. In the process, a burst of action will cause recoiling tensile strain concentration punching head, as shown in figure 5. Press the head bent joints, and can lead to the head of the crack and stamping forming. Figure 4. Deformation deflection punch and compressed floor. Figure 5. In punch through mode and stripping terminated when compressive strain, will cause the tensile strain pressure punch. Crack growth or reproduction Once formed crack, continue to do a high load of periodic motion will continue to crack up. Eventually leads to punching head from the organization of the result completely. If the punch and stamping institutions, when the pressure in the separation of periodic function under the punch can fall from the positioning circle. If this happens, will be serious damage mould processing equipment, the damage, the possibility of staff. Stamping mould and other steel mold destroyed components, will lead to sharp pieces in the air, the movement of high-speed do staff will make serious or even deadly damage. Personnel safety requirements Pressure safety regulations are emphasized in pressure during processing involves personal safety, the size of the distance with safety protection devices, open the size and other protective measures to solve the security personnel. Figure 6. In periodic high load, stamping and institutions of the stress can cause crack formation Figure 7. If in stamping head and institutions has resulted in the stress concentration of the joints of the crack formation, continue to operate will cause cracking continues to expand. All pressure injuries can be processed through proper planning, process control, employee training and follow the good habits of the pressure to avoid. But can crush out of the mould material and material requires a protective barrier to ensure a safe. This requires that all departments and insurance safety regulations explicitly pointed out. If the pressure exists in the course of processing, a kind of dangerous substances barrier protection is necessary. In some cases, with sufficient strength and thickness of the density of the plastic to prevent air movement in the mould parts is a solution. If that werent enough, there may be a need for enough strength to protect the solid steel. Figure 8 shows and head of stamping institutions. Punch selection of fracture Can design a boycott of the head, the structure of the damaged structure can usually be effectively eliminate head damaged. Punch holes and positioning and should have certain alignment. Head thickness should also slightly thicker than the depth of the hole. Keep these parts seal can prevent mould parts of mobile and exhaust. Figure 8. Stamping head completely separated from the support that punch can fall, it may cause damage to the mold and members of the damage. Support board stamping The floor is to provide a solid surface, to support stamping head. Regular use of the support plate is raw material through oil quenching. It is usually about 38RC heat to support 45RC - to ensure toughness and wear resistance. The hardness on tensile range can get longer bending life. Some experts think with the hardness of damping capacity. Damping properties of steel is low hardness and flexibility. However, the support of the proper heat treatment, only can be used to increase the intensity of cracking resistant plate. As figure 4, punching head will be compressed to support plate, plate punching in turn will support compression floor. Every time when pressing rushed through materials can occur compression. As shown in figure 5 shows as stamping rushed through the process of recoiling occurred materials. The head of the fracture problem solving Figure 9 shows two simple solution for all but the most serious damage to the head. The first method is a rounded head in to punch press to floor without bending. The second is improved in institutions and head of the big radius, this offer will be reduced by pressing size in this field generated by the stress concentration and the breakdown. The head of the changes If the head is in June, July and August, is not often happens, as shown in figure 9, punch grinding cone to finish around the circle of simple straight stamping. Advice about 3 Angle clearance to 6 degrees, and made the same size as handle with mold surface. Figure 9. Use the azimuth and punching head head and institutions in stamping juncture of a larger radius to reduce pressure, this solution will solve the problem most separate fracture. Grinding Angle is a simple process. Grinding Angle 1. Use the grinder. 2 the lathe tool turret with grinding appurtenances. 3 in the flat grinder with a simple rebirth hand grinding tapered land revolving fixture. 4 many common tool grinding machine can easily and quickly installation mode and grinding cone. Reducing stress applications. Head If is shown in figure 9 radius, must make a new stamping mould. The size of the locator must gaps. If the stamping positioning circle heat does not exceed 48RC, it should be possible to use mechanical processing to determine the location of the circle radius of high. By drilling, milling and boring to existing made these need properties of knife or tool grinding machine is easy. The hole is very suitable for carbonization after work. However, another option is jig grinders, inside diameter Numbers or conventional edm machine. With the increase of the ratio of cutting-edge head Another solution is to make the mechanism and the diameter of the head, if other than tip, it often failed to approach is an effective solution. But this solution some deficiencies, is must have the big diameter and expensive steel blank. The radius of the big head out of the hole than at intervals are limited. Bending stamping Ironworker and flush type punch The stamping has been using Ironworker style of portable equipment used for punching rivets and bolt hole plate and structure. Can Ironworker is a modern cutting steel, stamping steel hole and bending of special type of steel maker. Bending stamping mechanical blunt the use of this type of stamping. Figure 10. Head big radius is very effective, but it is expensive. It is out of the hole and the interval has restrictions. Figure 11. A Ironworker style punch is a very old design, the design to avoid the head of stress concentration areas. Mechanical blunt bending machine late-nineteenth century middle part stamping, usually has a strong on the back of the C frame. Early mechanical drive machine double or triple is usually reduction gear, therefore can play a tremendous strength. This design have been widely used in various inventions plate manufacturing rivet and bending stamping, such as in the work. In the development of the familiar, metal work before the bulldozer bending machine widely used blunt. The origin of this one design goes back to the nineteenth century used in the manufacture of boiler shell and other fabricated metal products of stamping head type. This kind of design in this kind of work can produce simple tools under the evolution happened. Blacksmith, This type of punch advantage is to reduce the stress concentration of the head, should as far as possible in the head. This kind of design to production, is not only a kind of saving and also wont work in heavy load. But there is a flaw in the design, manufacture, stress the need to use the punch fixed board may not easily obtained. Many modern good Ironworker stamping equipment is used in large Angle, instead of fillet. These prove to avoid problems in stamping head breaking hard metal machining process has been solved. Figure 12. Placed under the head of a pressing elastic gasket as a means to reduce the vibration. This method has been tried many times but little success. The elastomer material is often damaged and punch was out of the hat. Elastic gasket The rubber gasket to put the head around or stamping below as a means to reduce the impact of means little success. This method has been tried many times but little success. The elastomer material is often damaged and punch was out of the hat. 第 9页 共 9 页

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