国产不卡视频网站嫩模_亚洲欧美日韩第二页_一区二区三区四区高清视频在线_一本色道久久综合狠狠躁邻居_亚洲激情国产美女_黄网视频在线播放_成人av一区三区_欧美午夜性爱剧场_成人午夜888黄色视频_两个人的视频全免费高清

Analysis of Jiangmen Motorcycle parts forging technology and die design of Automobile Forging

2019-12-29 1519

  With the development of automobile industry and China's accession to WTO, the quality and cost price of automobile forgings in domestic and international market are becoming more and more demanding, such as draft angle, weight tolerance, size, machining allowance and other requirements are very high, and the price is not ideal, but the batch is very large. In order to meet the market demand, this paper analyzes and practices the technology repeatedly, and finds an ideal technology, which is of great significance to the production of similar products.

  Product introduction and determination of process plan

  Product introduction

  The arm is a part used for the brake pump of heavy duty vehicle, and its structure is shown in Fig. 1. There are several difficulties in forging: (1) the draft angle is small, only 3 ° outside and 5 ° inside, while the ejector has only one place in ∮ 62 hole; (2) the machining allowance is small, and only boring and broaching are used for machining ∮ 62 and 23.2mm square groove; (3) the 10 nails of 10 - ∮ 6.2 * 5 are full of difficulties and have high position requirements, and the root fillet of the nail is r0.2, which makes the mold wear faster and the production flow faster In the process, it is easy to bump and cause deformation.

  Determination of process plan

  In order to adapt to mass production and improve efficiency, we have determined the following processes: (medium frequency furnace) heating / (cross wedge rolling) blank making / (25000kN hot die forging press) bending / pre forging / final forging / (3150kN double point press) punching / trimming / normalizing / shot blasting / precision pressing. In the technological process, two pieces are used at a time for heating, the part handle is long and thin, and the efficiency of free forging single piece is low. Use wedge cross rolling blank (as shown in Figure 2), and cut into two pieces on the rolling mill at the same time. Because the cross-section of the part changes greatly, from ∮ 55 to ∮ 23, it needs two wedges to complete, so it is difficult to process and repair the rolling die.

  In addition to ensuring the size of pressing head and handle, it is more important to correct the position of 10 nails, the fillet of root and the bending of handle. Therefore, two standard pressing plates with five holes are used to ensure the position of the nail and the round corner of the root, thus improving the service life of the forging die.

  Key points of mold design and manufacture

  Generally, in the design of the press bending die, only the shape bending of the extruded blank is considered to be consistent with that of the forging. Because the thickness difference between the big end of the arm and the handle is large, when the pre forging die is put in, the handle of the bent blank will be suspended. During the pre forging, the transition between the handle and the big end will be folded. Because the handle of the bent blank is suspended, the metal flow in this part is too large during the pre forging. Therefore, the design of the bending blank must make the bending blank on the pre forging die to make its shape consistent with the pre forging die.

  Jiangmen Motorcycle accessories http://identifyradio.com//


国产乱子伦农村叉叉叉 | 国产乱子伦农村叉叉叉 | 久久久青青躁a∨免费观看 国产精品99精品免费视频 | 亚洲第一AV无码专区 | 国产精品观看无码不卡视频 | 免费看日韩无遮挡精品毛片 | 亚州AV无码专区国产乱码 | 精品无码中文视频在线观看 | 亚洲欧美综合人成在线观看 | 国产一级a毛一级a看免费视频 | 国偷自产av一区二区三区 | 精品97国产免费人成视频 | 日韩美女高潮喷水亚洲一区 | 中文字幕人妻痉挛按摩在线 | 日韩人妻在线一区二区三区 | 久久久久99精品成人片三人毛片 | 东北少妇刺激对白在线观看 | 亚洲成av 人片在线观看无码 | 国产精品乱码在线观看AV | 日韩精品无码免费专区午夜 | 国产午夜福利100集发布 | 国产成人无码免费在线观看 | 午夜av影院久久中文无码 | 亚洲一级av影视在线观看 | 自拍日韩亚洲一区在线 | 黄色视频网站在线免费观看 | 国产在线无码不卡影视影院 | 黄瓜视频在线资源免费观看 | 无码人妻少妇久久中文字幕 | 人妻无码久久久久久久久久久 | 国产又爽又黄无码无遮挡在线观看 | 国产高清无码在线观看视频 | 亚洲人成在线播放无码 | 亚洲精品国偷拍自产电影 | 美女主播自摸一区二区三区 | 亚洲精品国产第一综合99久久 | 日韩欧美在线一区二区中文 | 亚洲AV秘一区二区久久 | 国产欧美日韩va另类在线播放 | 亚洲中文字幕在线观看视频 | 天堂资源中文最新版在线一区 |