Sandblasting Material

Like many people, you may be confused about the difference between sand blasting and shot blasting. The two terms look similar, but sand blasting and shot blasting are actually independent processes involving the whole sand blasting business.

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The difference between sand blasting and shot blasting is simple. It lies in the application technology used by industry experts in material cleaning, repair and preparation to apply abrasive materials to products ready for finishing. Essentially, the sandblasting process uses compressed air to spray some form of grinding medium (such as sand) onto the treated product. Shot peening uses centrifugal force from the mechanical device to push the treatment medium onto the product.

1.What is sandblasting material?

Sandblasting is a method of removing dirt by strongly spraying dry sand flow onto the surface of metal parts with purified compressed air. Sandblasting can remove the burr, oxide scale and slag on the surface of metal parts. In electroplating production, it is mostly used for pre plating treatment of castings. It can remove the sand and high carbon layer left on the castings by sanding, so as to ensure easy electroplating.

In order to prevent the oil from contaminating the sand particles, polluting the processing surface and blocking the nozzle, the parts with too much oil on the surface shall be degreased and dried in advance before sand blasting, and the compressed air sent into the sandblasting machine shall also be filtered and purified. The pressure of compressed air depends on the material, shape, surface state of machined parts and the requirements for surface machining quality.

Sandblasting is also often used as the surface preparation process of phosphating, spraying and painting. Sand blasting will produce a lot of dust, so it should be carried out in closed equipment with dust suction device. Sand blasting is a proven pre finishing technology, which has existed for more than 100 years.

Sand blasting equipment has developed from uncontrolled and free spraying sand flow that produces harmful dust clouds to highly complex closed shell with accurate abrasive flow control. Sandblasting's medium has also changed from sand to a more humanized material. Despite changes in equipment and materials, sandblasting is still the most common and preferred abrasive treatment method. It is especially suitable for soft and sensitive materials ready for final finish.

Sandblasting is also a more economical equipment system, which is easier to operate and provides consumers with excellent quality. Sand blasting is required as pretreatment for hard chromium plating of various castings. Some machine tool parts also use sand blasting to extinction before white chromium plating. In addition, using sandblasting grit to clean the welds of weldments is also of great significance to ensure the quality of electroplated coatings of assemblies.

There are many kinds of sandblasting material. What kind of emery products need to be started from model to material, and there are thousands of types. Therefore, before selecting the required sand blasting material, it is necessary to first determine the production process of metal sand blasting, manual sand blasting or mechanical sand blasting, water belt sand blasting or dry spraying.

2. How to choose sandblasting abrasive

There are many kinds of sand blasting materials, such as silicon carbide products, brown corundum products, emery products, garnet products, white corundum products, quartz sand products, steel shot blasting, black corundum products, glass beads and so on, which can be used on metal blasting.

The principle of metal sandblasting is very simple. In fact, it is compressed air to impact the sand blasting abrasive out, or air to carry the sandblasting abrasive out, so that its products can quickly and effectively hit the workpiece to be processed. Most of the descriptions are the same, that is, it is necessary to knock out the unwanted, leave the desired, smooth the ups and downs of the product, leave flat and shine.

Most of the sandblasting grit are mineral or metal abrasives, which can be excluded:

2.1 Silicon carbide products are the most expensive sandblasting materials at present. The consumption of the products is small, the effect is fast, and the price is higher than that of white corundum products. They are recognized emery. In fact, they can only be regarded as a kind of emery products.

2.2 The price of white aluminum oxide products is relatively high, but in terms of removing some oxide layers and retaining special workpieces that cannot react, the products are actually the best choice. Because of their high purity, the price of white aluminium oxide products is also slightly more expensive.

2.3 Brown aluminium oxide product, which is the most cost-effective sandblasting grit in the product, is also used in the widest range in terms of sandblasting metal, and has high adaptability to material.

2.4 Quartz sand products are cheap derusting and sand blasting materials with low price and high hardness. This sandblasting material can be used for the maintenance of large boilers and the construction of large pipelines. When quartz sand is used, the pressure of compressed air generally does not exceed 3 × L05pa, because the pressure is high, the sand flow rate is high, and it is easy to crush, which will affect the production capacity of sand blasting. The angle between the sand flow and the machined part surface also has a great impact on the sandblasting effect. Only by selecting the best angle can the dirt on the part surface be removed as soon as possible.

2.5 Black corundum products, people who are not in abrasives, basically do not have much contact with such abrasives, which are expensive, and the quality is not necessarily better than brown corundum products. However, if there is demand in the market, it must exist. Most of them are used in grinding wheel cutting blades, and few are used for sandblasting.

The commonly used sandblasting methods include dry sand blasting, wet sand blasting, dust-free sand blasting and high-pressure water sand blasting. Dry sandblasting has large dust, which hinders environmental protection and endangers health; Although there is no dust in the wet process, moisture will rust the surface again. The way to prevent rust is to add 1% ~ 15% of antirust agent (trisodium phosphate, sodium carbonate, sodium nitrite, etc.) and emulsifier or soapy water into the water to make its surface no longer rust in a short period of time, and then apply maintenance primer.

Dust free sandblasting is the continuous circulation of sand addition, sand blasting and sand collection and recovery in a closed system to avoid dust flying. High pressure water blasting is mainly used for rust removal in large areas, such as ship hull, oil tank, oil tank, boiler, etc. passivator and soapy water are often added to the water.

3. Shot blasting or sand blasting

Derusting quality grade requirements: all steel surfaces to be coated with waterborne inorganic zinc rich coatings must be shot blasted or sand blasted to reach iso8501-1 (gb8923-88) SA2 Level 5 requirements. When repairing the coating locally, the steel surface must be polished to grade ST3 of iso8501-1 (gb8923-88). Surface roughness requirements: the surface roughness shall be controlled within 35 ~ 65 μ Within M.

In order to ensure that the steel surface reaches the specified cleanliness and surface roughness after shot blasting or blasting, it is recommended to use angular or ball shaped stainless steel sand with particle size of 0.3-0.8mm. The sandblasting abrasive used shall be clean and dry and shall not be contaminated by organic matters. Compressed air: compressed air for sand blasting, and the pressure shall not be less than 0.5MPa.

4. What is shot blasting?

The term "shot blasting" refers to the process of pushing abrasive medium materials with centrifugal or mechanical force. It has a completely different pressurization system from sandblasting. This abrasive treatment method uses a device similar to a spinning wheel to centrifugal accelerate the pellet material and spray it onto the surface.

Shot blasting is a more aggressive grinding technology than sand blasting. It is usually used for larger and more difficult preparation objects that require strong application force and more dense media materials to clean and prepare the surface. Shot peening also requires strict control, because if the process is not limited, the force of shot peening may cause collateral damage.

You often find shot blasting centrifugal wear treatment in large-scale operation. This may be in shot blasting tanks, steel shot or sandblasting rough surfaces, such as repairing car frames or recycling steel containers. You will also find that shot peening of engine components is required at work to improve ductility.

5. Which is better - sand blasting or shot blasting?

There is no right or wrong answer to the question of which is better, sand blasting or shot blasting. Sandblasting involves many variables. The best method depends on the surface you want to treat and the type of finish you want. Sand blasting is usually a smoother and less invasive wear process. However, it also depends on the compressed air pressure you use and the grinding medium you choose. Because the strength of sandblasting is not as strong as shot blasting, its tolerance is much greater.

Using light pressure and soft dielectric materials (such as organic or glass), you can handle very sensitive surfaces with little risk of accidental damage. Sand blasting is an ideal solution for cleaning corroded precision electronic parts or connectors. You have many media options with sandblasting material, such as alumina, which can cut surface contamination and keep the bottom clean but completely intact.

For more wear of sandblasting, you can upgrade to silicon carbide as the medium without worrying about overuse. Shot peening is useful when you need deep abrasive penetration on dense materials. Sand blasting may be too gentle and time-consuming when processing gears and shafts, and shot blasting will quickly prepare heavy surfaces, such as metal shells and truck hubs.

Shot peening is very suitable for coarse abrasives, such as steel shot and steel sand. These are heavy media materials that can impact the surface to loosen caked rust or baked contamination. You may have heard of discussions about shot peening and shot peening. Shot peening is a metallurgical term used to strike metal to increase strength and durability. Shot peening is actually a shot peening process used to treat harder surfaces than sand blasting.

The fair answer to whether shot blasting is better than sand blasting is best left to finishing experts and informed consumers' expectations of their finished products. In short, sandblasting is fast and economical. Shot peening is a process that involves more processing and uses more advanced equipment. Therefore, shot peening is slower and usually more expensive than sand blasting. However, some work cannot be treated by sand blasting. Then, your only choice is shot blasting.

Two different types of equipment are used for sand blasting and shot blasting processes. Both types provide effective methods for preparing surfaces. Generally, these are metal surface treatment technologies, such as derusting, descaling, deburring and general cleaning before coating the top coat. Both forms of sandblasting push the grinding medium flow to the product surface. They only use two independent systems called blast and air wheel equipment.