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
久热久亚洲精品中文字幕 | 一区二区三区国产 | 中日中文Av一区二区三区 | 在线内射学生妹v | 亚洲精品国产页码 | 日韩精品少妇无码一区二区三区 | 麻豆91午夜啪啪啪视频 | 日韩精品系列在线播放 | 91精品国自产在线观骚货 | V精品人婕一区二区 | 国产精品一区二区无线 | 国产一片姪乱洗澡 | 波多野结衣叫声最爽的一次 | 特级做a爰片毛片免费69图片 | 又粗又长又黄又猛的视频免费 | 午夜自产精品一区二区三区游乐网 | 91人妻人人澡人人爽人 | 影视先锋无码在线观看 | 麻豆精产一区二区 | 无套TV影院导航 | 精品人妻少妇AV无码专区 | 激情综合网激情五月天 | 东北女人无套内谢毛片 | 国产精品爱久久久久久久威尼斯 | 久久久久成人视频 | 午夜视频成人无码一区二区 | 在线播放高清无码 | 人妻免费久久久久久久了 | www.小黄书.最新地址 | 免费黄色一区二区 | 办公室少妇激情呻吟A片在线观看 | 亚洲AV五月天在线不卡 | 国产又粗又大又黄 | 国产一区二三区免费A片惊变 | 免费在线观看黄色视频网站 | 亚洲AV秘 无码一区春谷美雨 | 亚洲AV久久久久 | 色婷婷AV一区二区三区大白胸 | 天堂网2020综合视频在线观看 | 久久无码视频电影 | 凹凸日日摸日日碰夜夜爽孕妇 |