国产熟女一区二区三区五月婷,中文亚洲av片不卡在线观看,亚洲精品国产suv一区88,亚洲成av人片在线观看www

Welcome to the official website of Dalian wanderrui Import & Export Co., Ltd!

National consultation hotline

0411-66886100

Your current location : home >> News >> Company news

What is the structural design of the casting?

Date of issue:2016-04-07 00:00 Source:http://hychibao.com Click:

What is the structural design of the casting?


Dalian castings are cleaned manually by means of wire brushes, chisels, files, air shovels and other tools. Manual cleaning has high labor intensity, poor sanitary conditions and low efficiency. However, for some castings with complex shapes, manual cleaning is more appropriate. Qualified products refer to castings whose appearance quality and internal quality meet the current national or industrial standards, the production process and quality are stable, and the user's evaluation can meet the service performance, 60<c<80; First class products refer to castings whose appearance quality and internal quality meet the current national or industrial standards, the production process and quality are stable, and the quality evaluated by users reaches the domestic advanced level. From the origin of metal casting to now, both at home and abroad, people in gravity casting to a large extent use molten metal, then pour it into the pre cast mold, with the help of self weight feeding and solidification of the metal, so as to obtain the designed castings. Whether it is black metal or non-ferrous metal, people still use the above methods to produce castings.


Many workers have done a lot of work on the theory of sequential solidification, but so far, how to make the castings designed by ourselves achieve the ideal sequential solidification and successfully meet the sequential feeding solidification of castings with the help of it. So as to achieve the goal of good internal quality of castings, which has not yet provided an ideal calculation control method. This method can be said to be an effective method to properly arrange the shrinkage cavity and porosity of castings due to insufficient shrinkage. During solidification, the concentration of solute in the precipitated phase is different from that in the liquid phase. In most cases, the concentration of solute in the liquid phase is too rich to diffuse, which makes the chemical composition of the successively solidified part uneven.


The casting continues to cool after solidification, and the solid shrinkage is hindered to produce the casting internal stress. When the internal stress reaches a certain value, the casting will be deformed or even cracked. Sand holes are also common defects of cylinder block castings, which are mostly seen on the upper mold surface of the casting, but also exposed after processing on the inner surface of the cylinder barrel. The design of the gating system is unreasonable. Macropores formed at the hot spot or the last solidified part of a casting due to poor feeding during solidification The distribution characteristic is concentrated shrinkage; When the crystallization temperature range of the alloy is wide, there is a wide solidification region of liquid and solid phases after the crust on the surface of the casting. Continue to solidify, and the solid phase continues to increase. Die forging is divided into open die forging and closed die forging. Forgings are obtained by pressing and deforming metal blanks in a certain shape forging die chamber, which can be divided into cold heading, roll forging, radial forging, extrusion and so on.



Relevant labels:

Recent browsing:

Related products:

Related news:

大連船用零部件

Scan and pay attention to us

National consultation hotline:

0411-66886100

Q Q:52410155

Mailbox:wangdewen@wanderui.com

          zhuxingguang@wanderui.com

Address:No. 730, Southwest Road, Shahekou District, Dalian

Dalian wanderrui Import & Export Co., Ltd版權(quán)所有  Specializing in大連鑄造件,大連船用零部件,大連電機(jī)殼  遼ICP備16001801號
Powered by Clouds platform  Technical Support:聯(lián)企時(shí)代
Main business area: 大連 沈陽 鞍山 撫順 本溪 丹東 錦州 營口 阜新 遼陽
Online Service
share
欧美乱人伦人妻中文字幕| 99久久婷婷国产综合亚洲| 高潮又爽又无遮挡又免费| 国产精品无码久久AV| 亚洲伊人成综合人影院青青青 | (无码视频)在线观看| 欧美日韩亚洲国内综合网| 国产乱人伦av在线a| 成年午夜无码AV片在线观看| 久久男人av资源网站| 久久久无码精品亚洲日韩按摩| 国产精品igao视频网网址| 精品999日本久久久影院| 亚洲AV无码一区二区三区天堂古代 | 成人伊人精品色XXXX视频| 亚洲AV无码资源在线观看| 亚洲乱码中文字幕在线| 又紧又大又爽精品一区二区 | 日本XXXX色视频在线观看免费不卡| 亚洲爆乳大丰满无码专区| 亚洲色18禁成人网站WWW | 国产在线拍揄自揄拍无码| 日本一卡二卡3卡四卡网站精品| 国产成人国拍亚洲精品| 亚洲av一二三区成人影片| 久久精品国产网红主播| 国产三级在线观看完整版| 精品日韩亚洲AV无码| 无码人妻精品一区二区三区66| 黄色a级国产免费大片| 国产内射老熟女aaaa| 亚洲av中文无码乱人伦在线播放| 亚洲av永久无码精品古装片 | 18禁黄网站禁片免费观看不卡| 国产精品久线在线观看| 噜噜噜亚洲色成人网站在线观看| 久久久久有精品国产麻豆| 欧美人与动人物牲交免费观看久久| 蜜臀av午夜一区二区三区| 久久综合狠狠综合久久综合88| 男人和女人爽爽爽免费视频|