国产a级作爱片免费看_欧美日韩中文国产天堂_午夜在线观看一区二区三区_免费观看av一级毛片_可以进来逛逛免费区欧美一级猛片又黑又硬_AV无码流白浆大_午夜视频欧美在线观看_久久亚洲国产视频91视频_国产综合日韩伦理_惠民福利国产AV旡码专区亚洲AV

Automotive Gear

PRODUCT PARAMETERS:

The manufacturing materials and heat treatment process of the gear have a great impact on the bearing capacity and dimensional weight of the gear. Before the 1950s, Wuyi automobile gear used carbon steel, used alloy steel in the 1960s, and used surface hardened steel in the 1970s. According to the hardness, the tooth surface of the gear can be divided into two kinds: soft tooth surface and hard tooth surface.

The bearing capacity of the hard tooth surface gear of the gear is high, and it is quenched, surface quenched or carburized quenched after the gear is finely cut to improve the hardness. However, in the heat treatment, the gear will inevitably be deformed, so after the heat treatment, the gear must be ground, ground or fine cut to eliminate the error caused by deformation and improve the precision of the gear.

CONTACT US
ADD:Zhejiang Wuyi Cultural and Educational Tourism Industrial Park
Contact:Miss Xu
Mobile:0086-15267308517
Contact:Mr. Xu
Mobile:0086-13906795439
Fax: 0086-579-87402822
E-mail: zjjcxy1990@163.com
Xushan0822@hotmail.com
四川少妇丰满BBBB | 久久久亚洲AV成人无码www | 亚洲精品久久久久久久久久蜜桃 | 一级av免费在线观看 | 学生妹一级J人片内射视频,日韩在线视 | 试看婬片15分钟 | 成人做爰A片免费播放乱码 久久婷婷婬片A片AAA | 一本无码人妻一区二区 | 日本就不卡在线观看 | 国产一区二区三区三州 | 久久久久久久亚洲Av无码 | 午夜福利免费一级福利免费 | 国产日韩在线播放 | 亚洲国产无码在线 | 1000部丰满熟女视频 | 久久久久久久久久五月婷婷丁香 | 亚洲国产人成视频在线观看 | 无码人妻一区二区三区免费费 | 久久人人爽精品玩人妻av | 亚洲精品无码永久在线观看 | 老太婆BBw搡BBBB搡搡搡 | 精品亚洲一区二区三区四区五区 | 樱花视频A片成人免费播放 国产亚洲人成a在线v网站 | 国产WWW,com| 我和子的与子乱视频 | 一区二区三区四区高清视频在线观看 | 四虎影库hh视频无码外国网址 | 近親相姦中出し親子 | 久久久无码人妻精品一区 | 日韩在线播放视频 | 黄片大全在线观看 | 天天摸天天碰视频 | 91精品无码少妇a 6 2v蜜桃 | 亚洲无码视频播放 | 无码精品国产一区二区三区四区五区 | 视频二区素人熟女 | 欧美日韩动漫偷拍 | www免费黄色网 | 亚洲系列在线播放 | 千涩成人无码av | 高清美女裸体蜜桃麻豆91 |