Main factors affecting the wear of shot blasting machine parts

The main factors affecting the wear of shot blasting machine accessories are accessories material, working load, movement speed, temperature, humidity, environment, lubrication, surface processing quality, assembly and installation quality, structural characteristics of parts and movement properties.

1. Influence of shot blasting machine accessories material on wear
The wear resistance of shot blasting machine accessories material mainly depends on its hardness and toughness. The hardness determines the ability of the surface to resist deformation, but too high hardness can easily increase the brittleness and cause abrasive peeling on the surface of the accessories; toughness can prevent the generation of abrasive particles and improve its wear resistance.Parts that have undergone heat treatment or chemical heat treatment can obtain excellent mechanical properties and improve the wear resistance of the parts. Sometimes, the surface flame quenching or high frequency quenching method can be used to improve the wear resistance of the material, or the method of carburizing, nitriding and carbonitriding can be used to make the surface of the steel have higher hardness and wear resistance.In the combined parts, such as the shaft in the bearing pair, since it is the main part that needs to be processed, it should be made of wear-resistant materials (such as high-quality alloy steel); for simpler parts, such as bearing bushes or bearing bushes , then use softer materials such as babbitt, copper-based alloys, lead-based or aluminum-based alloys (also known as anti-friction alloys) to manufacture to reduce friction and improve wear resistance.

2. Influence of working load of shot blasting machine accessories on wear
In general, the greater the unit pressure, the more severe the wear of the parts. In addition to the size of the load, the load characteristics also have a direct impact on the wear, such as static load or variable load, impact load or not, short-term load or long-term load, etc. Under normal circumstances, the parts should not be overloaded and subjected to shock loads for a long time.

3. The influence of the moving speed of shot blasting machine accessories on wear
When the machine is running, the level of speed, direction, variable speed and uniform speed, forward and reverse rotation, start and stop, etc., all have different degrees of influence on wear. Usually under dry friction conditions, the higher the speed, the faster the wear; when there is lubricating oil, the higher the speed, the easier it is to form liquid friction and reduce wear; the higher the starting frequency of the machine, the faster the wear of the parts.

4. The influence of temperature, humidity and environment on wear
Temperature mainly affects the adsorption strength of lubricating oil. The lubricating oil film has quite high mechanical stability, but the temperature and chemical stability are poor. When there is a high temperature and chemical changes, the lubricating oil loses its adsorption performance. If the surrounding environment where the machine works is affected by moisture, water vapor, gas, dust, iron filings or other liquid and gas chemical corrosive media, it will cause and accelerate the oxidation and corrosion wear of the machine parts.

5. The influence of lubrication on the wear of shot blasting machine parts
Lubrication plays an important role in reducing the wear of mechanical parts. For example, the state of liquid lubrication can prevent adhesive wear; the supply of clean lubricating oil can prevent abrasive wear; the correct selection of lubricating materials can reduce corrosion wear and fatigue wear. Keeping enough lubricant in the lubricating friction pair with good operation of the parts can reduce the direct friction between the metal and the metal of the friction pair, reduce the power consumption, prolong the service life of the parts, and ensure the normal operation of the equipment. Lubrication can effectively improve the effect of wear and is of great significance for mechanical maintenance.

6. Influence of surface processing quality of shot blasting machine parts on wear
Surface finish quality mainly refers to the machining quality, including macro geometry, surface roughness and tool mark direction.
6.1 The influence of macro geometry on wear The so-called macro geometry refers to the deviation between the actual shape and the ideal shape after processing, that is, the machining accuracy, such as roundness, cylindricity, parallelism and perpendicularity, etc. The deviation of the macro geometry makes the surface of the part The load distribution is uneven, and it is easy to cause serious wear in local areas.
6.2 The effect of surface roughness on wear is not that the smaller the surface roughness value, the smaller the wear. It is known from the test that there is a most reasonable surface roughness under each load to minimize the wear amount; under the same load, the smaller the surface roughness value, the smaller the wear, but the wear will resume after the reasonable point is exceeded. will gradually rise. This is because the surface is too smooth, which increases the contact surface and increases the attraction between molecules, thus increasing the possibility of adhesive wear.
6.3 The influence of the direction of the knife marks on the wear The direction of the knife marks has a great influence on the wear. If the direction of the knife marks on the two friction surfaces is parallel and consistent with the movement direction, the wear is small. If the direction of the tool marks on the two friction surfaces is parallel but perpendicular to the direction of motion, the wear will be larger. If the direction of the tool marks intersects with the direction of motion, the wear is between the two.

7. The influence of assembly and installation quality on the wear of shot blasting machine accessories
The assembly quality of the parts has a great influence on the wear, especially the matching clearance should not be too large or too small. When the gap is too small, it is not easy to form liquid friction, and it is easy to generate high friction heat, and it is not conducive to heat dissipation, so it is easy to cause adhesive wear and friction pair seizure. When the gap is too large, it is also difficult to form liquid friction, and it will generate impact load and increase wear. Assembled parts or machines should also be installed correctly. If installed incorrectly, it will cause uneven load distribution or additional load, make the machine inflexible, generate noise and heat, and cause premature wear of the parts.

8. Structural characteristics and motion properties of shot blasting machine accessories affect wear
The structure and movement properties of the parts are different, and the wear conditions are also different. For example, the wear of rolling friction is much smaller than that of sliding friction, and usually the amount of rolling friction and wear is half or less of that of sliding friction.

9.How to improve the wear resistance of blades
Although low-alloy white iron can adapt to the impact under low load, it has a very short service life and is not an ideal material. Wear-resistant performance, but can not display good wear resistance for impact under low and medium stress; high-chromium cast iron is the third-generation wear-resistant material after high-manganese steel, because its structure contains ideal m7c3 type eutectic carbide. Moreover, it is easy to obtain martensitic structure, and it shows great superiority compared with other wear-resistant materials, so it is widely used. However, high-chromium cast iron is relatively brittle, and is easily broken and broken under high impact, and it is difficult to grasp its formation mechanism in actual production to obtain an ideal matrix structure.

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