Several commonly used materials and basic requirements for gear processing

XNUMX. Description of several materials commonly used in gear processing

1. Steel: commonly used is 0.1%-0.6% carbon content, better performance, can improve mechanical properties through heat treatment.

a、铸钢：一般用在尺寸较大（d>400-600mm）且不宜锻造的应用场合。耐磨性和强度都比较好，承载能力相对锻钢要低，ZG310-570、ZG340-640成本高。

b、锻钢：常用的有45、35SiMn、42SiMn、40Cr、35CrMo，钢材经过锻造，性能得到大大的提升。

2、铸铁：有灰口铸铁（HT200、HT300）及球墨铸铁（QT500-7），产品易成型但强度差，一般用在开式齿轮、低速应用场合。

3. Aluminum alloy, copper and other materials.

4. Other non-metal processing materials: such as plastics, plastics, etc., generally used in low power, high speed, low noise and other requirements.

XNUMX. Basic requirements for gear processing materials

1. Easy to process and heat treatment

2. The tooth surface hardness should be hard enough, and the tooth core should be tough.

3. Because the small gear has more stress cycles, the tooth root strength is weaker, and when the large and small gears have a large hardness difference, the harder small gear will have a cold work hardening effect on the softer large gear tooth surface. Improve the contact fatigue strength of large gears.Therefore, in order to ensure the same service life of large and small gears, the hardness of the small gear tooth surface is 30-50HBC higher than that of the large wheel, soft tooth surface HBS<=350, and hard tooth surface HBS>350.