18禁在线无码无遮挡观看视频,天天躁日日躁AAAAXXXX,色综合久久88色综合天天,蜜臀AV无码一区二区三区

歡迎進(jìn)入深圳市錦鴻宇實(shí)業(yè)有限公司官網(wǎng)!
News
NewsNews

Significance of machining

時(shí)間:2020-06-09瀏覽次數(shù):3772

In actual application, any product can only be arranged for sale and use after being processed and inspected in various series. According to the data, precision machining is the most frequently processed item in finished products. After all, mechanical equipment with excellent performance can produce better products. With the development of modern industries, the structure and configuration of machinery has become a focus. Only when the technology is continuously upgraded will the future development of various industries be played to a greater extent.


 Precision machining refers to the process of changing the external dimensions or performance of a workpiece through a mechanical device. According to the difference in processing methods, it can be divided into cutting processing and pressure processing. A mechanical part is composed of several surfaces. To study the relative relationship of the parts' surfaces, a datum must be determined. The datum is the point, line, or surface on which the position of other points, lines, or surfaces is determined. According to different functions of benchmarks, benchmarks can be divided into design benchmarks and process benchmarks.


The design basis for precision machining is the reference used to determine the position of other points, lines, and areas on the part drawing, which is called the design basis. The process benchmark of precision machining refers to the benchmark used in the processing and assembly of parts, and is called the process benchmark. Process benchmarks are divided into assembly benchmarks, measurement benchmarks and positioning benchmarks according to different uses.

1. Assembly benchmark: The benchmark used to determine the position of a part in a component or product during assembly is called the assembly benchmark.

2. Measurement benchmark: The benchmark used to check the size and position of the processed surface is called the measurement benchmark.

3. Positioning datum: The datum used for positioning the workpiece during processing is called the positioning datum. As the positioning reference surface (or line, point), only the unprocessed rough surface can be selected in the first process. This positioning surface is called the rough reference. In the subsequent processes, the processed surface can be used as the positioning reference , This positioning surface is called fine datum.

服務(wù)熱線:13631565136
手機(jī):18926579610
電話:0755-26740010
郵箱:senyuanmoju@126.com
地址:廣東省深圳市寶安區(qū)石巖街道水田工業(yè)區(qū)寶石東路123號(hào)7棟1樓

掃一掃關(guān)注我們

啊灬啊别停灬啊灬快点| 国产乱理伦片A级在线观看| 精品国产一区二区三区AV 性色| 免费AV一区二区三区无码| 被主人在厨房用黄瓜调教| 人善交VIDEO另类HD| 久久久久无码国产精品不卡| 国产情侣疯狂作爱系列| 国产无遮挡裸体免费视频在线观看| 久久无码专区国产精品S| 全黄H全肉1V1各种姿势| 又硬又粗又大又爽时间持久| 久久久一本精品99久久精品66| 欧洲熟妇色XXXX欧美老妇免费| 我和亲妺婷婷在浴室作爱经过 | 丰满人妻熟妇乱偷人无码| 色欲综合久久躁天天躁蜜桃| 漂亮人妻洗澡被公强| 玩弄人妻少妇500系列网址| 与子敌伦刺激对白播放| 国模少妇无码一区二区三区| 挺进毛还没长稚嫩的小花苞网种| 国产精品久久国产精麻豆99网站| 久久久久久国产A免费观看| 自拍偷在线精品自拍偷99| 又粗又长又大真舒服好爽| 上课忘穿内裤被老师摸到高潮| 日产VS国产VS欧产| 国产亲妺妺乱的性视频播放| 亚洲精品国产精华液| 公愆憩止痒48小说| 专干老熟女视频在线观看| 丰满少妇被猛烈进入AV久久| 狠狠97人人婷婷五月| 久久久精品人妻一区二区三区| 中国老太婆BBBBBXXXXX| 小13箩利洗澡无码免费视频| 女人OXOX自慰OXOX| 久久久久国产精品免费A片| 欧洲高清视频在线观看| 精品国产毛片A片久久久|