What is the difference between steel shots used in shot blasting machines and steel balls used in gr

Although the steel shot used in the shot blasting machine and the steel ball used in the grinding machine are both used for surface treatment and grinding, there are still some differences between them.

First of all, the hardness of steel shot and steel ball is different. Under normal circumstances, the hardness of the steel shot used in the shot blast machine is higher than that of the steel ball used in the grinding machine, because the shot blast machine needs more impact force to remove impurities and dirt from the surface of the object. Grinding machines, on the other hand, require softer steel balls to prevent scratches and damage to the surface of the object being processed.

Secondly, the roughness of steel shot and steel ball is also different. The steel shot used in the shot blasting machine is relatively coarse and has a higher surface roughness, which can remove the dirt and oxide layer on the surface of larger objects. The steel balls used in the grinding machine are relatively thin and have a high surface finish, which can carry out fine grinding and surface treatment on the surface of the object.

Finally, steel balls for blast machines are usually required to be strong and durable and can be reused multiple times, while steel balls for grinders may require higher wear resistance and need to be updated regularly.

Therefore, it is necessary to select suitable materials according to actual needs, and pay attention to protection and maintenance during use.

The main performance parameters of steel grit and steel shot:

Steel grit: GB6485---86

Chemical Composition: Carbon (C): Manganese (Mn): Silicon (Si): Sulfur (S): Phosphorus (P):

Hardness: 42 50HRC (399 509HV) Density:

Metallographic structure: tempered martensite diffusely distributed carbide.

Hardness: 45---65HRC Density:

Steel shot: GB6484---86

Chemical Composition: Carbon (C): Manganese (Mn): Silicon (Si): Sulfur (S): Phosphorus (P):

Hardness: 40---50hrc Density:

For the new machine, the first test machine to use the steel shot input is relatively large, because the machine is empty, the specific amount of the shot blasting machine according to the size of the shot, in the future according to the production of the rapid limb volume regularly do the delivery on the right line, this amount is much less than the first time.

Main technical requirements for high-carbon steel shots:

Specification grade: S400 S030;

Microhardness: 390HV-530HV;

Chemical Composition: Carbon: Manganese: Silicon: Sulfur, Phosphorus: ;

Metallographic structure: tempered martensite or tempered drossite;

Density; Total defects 10%;

Foreign impurities 1%;

Moisture content. The original standard GB6484-86 cast steel shot was abolished in 1993.

Because after the annealing of the tempered iron shot, the surface color is uniform blue, and the tempered iron shot is often used to pretend to be a cast steel shot, and the service life of the iron shot is only 50 400 times, and the rust removal effect of the iron shot is seriously reduced, and the interests of users are seriously damaged.

Others: chromium-molybdenum steel shot and manganese steel shot on the market are the concept of the manufacturer's propaganda, because if 1% of molybdenum metal is added, it is necessary to increase 10kg of metal molybdenum per ton of steel shot, which requires 4,000 yuan, and the current domestic iron shot ** is about 3,000 yuan ton. Metallographic organization:

Tempered martensite, tempered dronther, reticulated carbide" grade 3.

Hardness: 45---65HRC Density:

Improper selection of steel shot will affect the normal operation of the shot blasting machine, and may also cause machine failure. Steel shots for shot blasting machines are generally commonly used in steel wire shot cutting, alloy shots, cast steel shots, iron shots, etc.

Customers with shot blasting machine for steel shot want to find the right steel shot, choose a good steel shot can not only improve the service life of the shot blasting machine and its wearing parts, but also improve the surface quality of the product, in general, the choice of the type and size of the shot mainly depends on the workpiece you want to clean:

Non-ferrous metals are generally made of aluminum or stainless steel; Ordinary steel and its welded parts, castings, steel, etc. are selected from steel shots;

The larger the diameter of the steel shot, the higher the surface roughness of the cleaned surface, but the cleaning efficiency is also high;

The cleaning efficiency of irregularly shaped steel grit or steel wire shot is higher than that of spherical ball, but the surface roughness is also higher;

Projectiles with high cleaning efficiency also wear out the equipment quickly (relatively), only in terms of use time, but this is not fast compared to production efficiency.

a) The hardness is directly proportional to the cleaning speed, but inversely proportional to the service life. Therefore, the hardness is high, the cleaning speed is fast, but the life is short and the consumption is large, so the hardness should be moderate (about HRC40-50 is appropriate) The best use effect.

b) Moderate hardness, with excellent performance, so that the steel shot can reach every place in the cleaning room, reducing the processing time.

c) The internal defects of the projectile material, such as pores cracking, internal shrinkage porosity, etc., can affect its life and increase consumption.

d), the density is greater than , then the internal defects tend to be the smallest.

The choice of shot does not depend on the blasting machine, but on the material of the workpiece to be machined. For example, after quenching products, reinforced steel shot is generally used, because its hardness reaches more than 50-54, and ordinary steel shot is easy to break when hit on it, which will cause scratches on the surface of the workpiece. The hardness of stainless steel pellets is generally only about 35, and the consumption of quenching materials will be very large.

Such a choice is unwise.

The following is a brief introduction to the use of steel shots.

Left and right alloy steel shots: processing of small castings, flanges, elbows, tees.

alloy steel shots on the left and right; It is suitable for valves, medium-sized weldments, bridge processing and oil pump refurbishment work of pavement shot blasting machines.

The above alloy steel shots: suitable for the surface rust removal of steel structures, the removal of oxidation layer on the surface of steel plates, the cutting of steel wire shots and the grinding of steel wires are suitable for the surface cleaning and processing of steel castings.

Stainless steel pellets are generally used in aluminum die castings, deburring and decontamination of titanium-magnesium alloys and high-demand cleaning treatment of stainless steel workpieces.

Of course not. Depending on the material and size of the workpiece, the type and type of pill will be determined. Steel shots, steel grit, stainless steel shots.

Stainless steel sand, copper wire shot cutting, zinc wire cutting shot cutting, aluminum wire cutting shot cutting, steel wire cutting shot and other metal abrasives can be used to clean the workpiece.

No! It's based on the products you need to handle! (to decide the type, size and type of your sand).

Apparently not.

It is also possible to use iron pills. There are different sizes by roughness.

You can use other ones, as long as it's a steel shot.

There are many kinds of steel shots, and there are many models, depending on how you choose.

The chemical composition is the most basic index of steel shot and steel grit, which will determine the microstructure of steel shot and steel grit and the effect of subsequent heat treatment. The carbon (c) content should be moderate. Silicon (Si) manganese (Mn) can improve the strength and hardness of steel shots, and it should be as high as possible (no less than is the best).

Sulfur (S) and phosphorus (P) are harmful elements, which are easy to make steel shots brittle, resulting in premature rupture, and should be as low as possible (the best).

Hardness: If the steel shot or steel grit is too soft, it will slow down the cleaning speed and reduce the work efficiency. In shot peening, a steel shot that is too soft cannot produce a suitable residual stress, and the force of a low hardness shot cannot be compensated by increasing the impact time.

If the hardness is too high, it will produce undesirable surface topography, increase the probability of projectile breakage, make the consumption too high, and wear and tear on the equipment is large, increasing the maintenance cost of the equipment, so the appropriate hardness is also critical.

Microstructure: The microstructure of the steel shot (sand) must be able to resist deformation, reduce energy loss and increase fatigue life when acting on the working surface. Tempered martensitic is the most fatigue-resistant, in addition, the fragile carbide must be reduced in the microstructure of the microstructure, otherwise it will cause premature rupture of steel shot (sand) and increase the amount of use.

Physical defects: Steel shot (sand) must contain as little physical defects as possible that can cause abrasive breakage. Due to the production process used, there will always be certain such physical defects in steel shot (sand). There must be a corresponding process in the production to control and reduce the proportion of defective particles.

Fatigue life: Fatigue life is the ability of steel shot (sand) to resist crushing when acting on the working surface. The abrasive with the longest fatigue life will be the most economical if it can convert the right amount of energy into cleaning.

What are the requirements for projectiles in shot blasting machines?

The diameter of the projectile required by the shot blasting machine is determined according to the roughness of the surface requirements of the parts and the hardness of the surface of the parts. Projectile materials include cold-hardened cast iron, malleable cast iron, cast steel, and steel wire shot, and the service life of various projectiles and the wear and tear of the blades are shown in the table.

Projectile code name. Projectile name.

Origin metallographic organization.

Specific gravity on the wear of the blades.

Projectile life. w-1 white iron pills.

Shandong martensitic.

Reticulated cementite.

Take iron pills as 1 and iron shots as 1

w—2 cast steel shots.

Shanghai slats martensitic

w—3 cast steel shots.

Liaoning tempered martensite

w—4 low carbon steel wire.

Beijing ferrite + pearlite

w—5 steel wire shots.

Zhejiang soxamine + ferrite

w-6 new steel wire pellet.

Shandong sostenite.

The diameter of the projectile required for ferrite is determined by the surface roughness required by the part and the surface hardness of the part.

The ability of the projectile to clean the casting, depends on the conversion of energy, and the kinetic energy of the projectile e0 is:

e0=∞q v2

If the projectile is too brittle, it is brittle. The hardness of the projectile is too low (the hardness of the projectile is generally greater than more than the surface hardness of the shot blasted workpiece), in the shot blasting process, the projectile is deformed and broken to consume energy, which affects the cleaning effect. According to the experiment, W-5 and W-6 steel wire pellets have a soxenite + ferrite metallographic structure, taking into account the dual properties of hardness (about 400 Vickers hardness) and toughness, and the cleaning effect is ideal.

The Vickers hardness of the white iron pellet is more than 700, which is fragile, and forms hard and sharp pieces after crushing, which wears out the blade very quickly, consumes energy, and reduces the shot blasting effect. Cast steel shot needs to be quenched to make it reach the martensitic structure, and the hardness is above 700 on the Vickers hardness, which has a good cleaning effect.

It is necessary to help you determine according to the type of blast machine you choose.

To put it simply, the steel shot is thrown onto the workpiece through the shot blasting machine.

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