成人久久久久-成人久久久久久-成人久久免费视频-成人久久网-日本天堂影院-日本天堂在线

CN EN
Company News
Home > Company News

The relationship between blanking gap and shear quality

Source:Suzhou Meiyuan Ruite Precision Machinery Co., Ltd. Time:2022-06-16 Browse:3465


Whether the blanking gap in the blanking process is reasonable will determine whether the upper and lower cracks on the fracture surface overlap, whether the shear force is balanced, and the size of the burr. Therefore, the mold design, manufacture and installation must ensure that the gap is uniform, and the gap between the convex and concave molds in the same manufacturing process should be kept within a reasonable range. Otherwise, the mold will appear part of the gap is too large and too small quality phenomenon.​​
 
Effect of Gap on Section Quality
1. Reasonable blanking gap
When the convex and concave gaps are appropriate, the cracks generated near the edges of the convex and concave die along the direction of the maximum shear stress can meet during the blanking process. At this time, although the section is not perpendicular to the surface of the material, it is still relatively straight, smooth and burr Smaller, the section quality of the part is better.
 
2. Punching gap is too small
When the gap is reduced, the bending moment is small and the compressive stress component is high in the deformation zone. The cracks generated near the edge of the die enter the compressive stress zone below the punch and stop developing; the cracks generated near the edge of the punch enter the compressive stress zone on the upper surface of the die and stop developing. The upper and lower cracks do not overlap. The material between the two cracks will be sheared a second time. When the upper crack is pressed into the die, it is squeezed by the wall of the die, resulting in a second bright band, and at the same time, part of the material is extruded, forming thin and high burrs on the surface. If the gap is too small, although the slump angle is small and the arch is small, the quality of the section is also defective. If there is an interlayer in the middle of the section, the two ends are bright bands, and there are long burrs on the end face.
 
3. Punching gap is too large
When the gap increases, the tensile stress in the material increases, so that the tensile fracture occurs early, so the fracture band becomes wider; the bright band becomes narrower; the bending deformation increases, so the slump and arch also increase. When the gap is too large, due to the large bending moment and the high tensile stress component, the cracks generated near the edges of the convex and concave molds will not coincide. The slope of the fractured layer generated after separation increases, and two oblique angles α1 and α2 appear on the section of the workpiece, and the section quality is not ideal. Moreover, due to the large slump angle, the large arch, the small bright band, and the high and thick burrs, the quality of the blanking parts is reduced.
 
4. The gap is uneven
The side with a small gap presents the cross-sectional feature of an excessively small gap, and the side with a large gap presents the cross-sectional feature of an excessively large gap


主站蜘蛛池模板: 最近2018中文字幕免费看2019 | kkk4444免费观看 | 在线www| 四虎美女 | 午夜毛片不卡高清免费 | 淫www| 精品美女在线观看 | 美女免费黄| 女人成午夜大片7777在线 | 四虎影院在线网址 | 玖玖国产在线观看 | 夜夜操天天操 | 国产播放啪视频免费视频 | 精品卡一卡二 卡四卡视频 精品噜噜噜噜久久久久久久久 | 亚洲免费网站 | 日本三浦理惠子中文字幕 | 日本三级理论 | 精品欧美 | 日本三级电影在线观看 | 69er小视频 | 男人女人真曰批视频播放 | 边做饭边被躁欧美三级小说 | 日本不卡高清免费 | tdg58在线观看 | 国产男女怕怕怕免费视频 | 久草福利在线播放 | 国产高清片| 视频在线免费看 | 狠狠操天天操视频 | 黄 色 成 年人在线 黄a大片 | 欧美精品一级 | 四虎国产精品免费入口 | cao草棚视频网址成人 | 在线中文字幕第一页 | 午夜免费剧场 | 婷色| 亚洲第一黄色网址 | 午夜刺激爽爽视频免费观看 | 波多野结衣久久国产精品 | 成片免费的禁v影片 | 亚洲一级毛片免费观看 |