时时彩平台出租|重庆时时彩的规律

冲头断裂英文文献和中文翻译

时间:2018-01-07 20:01来源:毕业论文
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
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.17096
  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. 本文来源:http://www.mamitama.com/a/www.go108.com.cn/

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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
                 nstitutions of the stress can cause crack formation 冲头断裂英文文献和中文翻译:重庆时时彩的规律/a/fanyi/20180107/18647.html
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