Seven elements when grinding steel balls wear

The steel ball of the ball mill is worn out-the surface material of the object is gradually lost due to mechanical action. Wear failure-mechanical products lose their proper functions due to material wear. The abrasive wear accounts for more than 50% of the total abrasive wear. The so-called abrasive wear: It is a kind of wear phenomenon caused by the hard particles or protrusions that enter the friction surface from the outside to plow and plan many grooves on the surface of the softer material, resulting in the migration of the material. Analyzing the wear mechanism of wear-resistant materials must be considered from two aspects: the external environmental conditions of mechanical wear and the inherent characteristics of wear-resistant materials.

The external environmental conditions of the ball mill steel balls: there are seven elements such as hardness, strength, speed, angle, temperature, humidity, and particle size.

1: Hardness: Among the many characteristics of wear, the effect of material hardness is important.

2: Strength; here specifically refers to the pressure of the material on the abrasive. As the wear pressure increases, the amount of wear increases, because as the pressure increases, the penetration depth of the abrasive into the material increases, and the energy for cutting the surface of the material increases.

3: Speed: For different types of wear, the effect of wear speed is different. In the case of sliding wear, the effect of speed is not obvious. Erosion wear speed has an important effect on wear. When the impact speed is high to a certain level, materials that do not cause wear in sliding wear or low speed conditions can also cause wear at this time.

4: Angle: The impact angle has a great influence on wear in erosion wear. The impact angle has different effects on brittle and ductile materials. For brittle materials such as ceramics, the amount of wear increases as the angle increases. Under the condition of vertical impact close to 90°, the amount of wear reaches a larger value, which indicates that brittle materials are not suitable for use in large-angle erosion conditions; for toughness For materials, the amount of wear first increases with the increase of the impact angle, reaches a large value at a certain angle, and then decreases with the increase of the impact angle. This shows that ductile materials are prone to wear when working at low angles, while they can give full play to their wear resistance at high angles. This is because the hardness of ductile materials is low, and the abrasive particles are beneficial to the cutting of the surface during low-angle erosion, and the amount of wear increases. When the brittle material is impacted vertically, the surface of the material is easy to chip and peel, so the amount of wear is large.

5: Temperature: As the temperature increases, wear increases.

6: Humidity: In actual engineering, in the case of a metal friction pair, the wear can be greatly reduced when the liquid enters the interface of the abrasive; however, in the case of abrasive wear, moisture enters in the abrasive, and the wear becomes serious.

7: Particle size: Abrasive particle size: the impact on wear increases linearly with the increase in particle size. When it reaches a certain value, the so-called critical particle size, the growth of wear becomes slow, or there is no The situation of further growth.