How to choose between soft tooth surface and hard tooth surface for a deceleration motor gear?
The gear of a deceleration motor can be divided into two types: soft tooth surface and hard tooth surface. So how do we distinguish between them? How should we choose? Below, Silent Industry will give a brief introduction.
Release time:
2022-03-28 17:49
www.gdmotor.cn
Reduction MotorGears can be divided into two types: soft tooth surface and hard tooth surface. How can we distinguish between them? How should we choose? Below, Silent Industry will give a brief introduction.
1. Distinguish from the hardness of the tooth surfaces of the two.
1. The tooth surface hardness of hard tooth surface gears is relatively high, usually greater than 350 HBW for a pair of meshing gears.
2,Reduction MotorThe tooth surface hardness of soft tooth surface gears is relatively low, with the hardness of meshing gears being less than 350 HBW.
2. Distinguish from the selection principles of the two.
1. Hard tooth surface gears are often used for high torque and high power transmission due to their high load capacity.
2. Soft tooth surface gears have lower load capacity but are easier to manufacture, have good running-in properties, and are often used in general machinery where size and weight are not strictly limited, as well as in small-scale production.
3. Distinguish from the process steps of the two.
1. Hard tooth surface gears undergo quenching, surface hardening, or carburizing after precision cutting to improve hardness.
2. Soft tooth surface gears are precision cut after heat treatment.
The strength design of gears is considered from two aspects: the tooth surface pressure under lubrication conditions and the root strength. With the development of technology and the application of computers, the trend in the development of global transmission technology is to adopt hard tooth surfaces. Statistics show that the adoption of hard tooth surface gears has greatly promoted the reduction of machine weight, miniaturization, and improvement of quality performance, increasing the working speed of machines by one level.
For example, the rolling speed of high-speed wire rod mills has increased from below 30 m/s in the past to 90-120 m/s. The use of hard tooth surface gear transmission has significantly reduced the volume of the transmission device, which can lower manufacturing costs. Hard tooth surfaces with nitriding are not suitable for low-quality heavy-load gear transmission due to the shallow depth of the nitriding layer, and the cost of the nitriding process itself is relatively high, so they are rarely used.
The transition interface between the hardened layer and the non-hardened layer in surface hardening (such as high, medium frequency, or flame hardening) is obvious, the distribution gradient of hardness is too large, and the hardening quality is uneven. Hardening at the tooth root is difficult, leading to surface cracks, and the tooth surface hardness is relatively low (around HRC 55), so its application is gradually decreasing.
High-precision hard tooth surface gears with deep carburizing and quenching grinding have many advantages such as high precision, high surface hardness (HRC 58+4), and uniform hardened layer, making them particularly suitable for low-speed heavy-load gear transmission. They have high surface hardness, and the contact strength increases several times compared to tempered gears, while the bending strength increases by more than 50% compared to tempered gears.
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