Production and Application of Cemented Carbide Crushed Grits

The manufacturing process of crushed cemented carbide includes two processes: crushing and screening.

First, alloy crushing can be divided into two methods: manual crushing and mechanical crushing. 

1. The waste hard alloy is heated to more than 800°C in the furnace by manual crushing method, and is immediately put into the water to cool, so that the cemented carbide cracks. The cracked carbide is then mashed inside an iron bell.

2. Mechanical crushing method mechanical crushing can be used as a hammer crusher or roll crusher. It is best to choose two roll crushers for this work, one to do rough breaking, the other to do fine breaking. To change the distance between the two rollers of the roll crusher, you can do this work hard, one table to do rough breaking, the other to do fine breaking. To change the distance between the two rollers of the roll crusher, you can do this work hard, one table to do rough breaking, the other to do fine breaking. To change the pitch between the two rollers of the roll crusher, the cemented carbide can be broken into various grain segments of the product.

Second, sifting and grading.

A small amount of products broken by hand are sifted through with a standard sampling screen. Mass production of a large number of products to use mechanical vibrating screen. If the five-layer vibrating screen is selected, the product can be screened into five particle size ranges at one time. Millimeters of coarse grained cemented carbide can be graded by self-made stainless steel hand screen. The stainless steel plate with a thickness of 2 mm is welded into a shallow plate, and some holes are drilled in the shallow plate according to a certain particle size classification range to become a millimeter coarse screen.

Different particle size range of granular cemented carbide, its use is different. The following I will talk about the applications of granular carbide in different particle size ranges. There will be ten applications in total.

1. Geological drilling tools

Carbide composite welding rod is made of crushed carbide with particle size of 3~5 mm and copper or iron base filler metal, and then the welding rod is surmounted to the lip of the drill bit with oxygen acetylene flame to make geological core drill. In this way, the welded drill bit can drill into 5~6 medium friction rock formations, and improve the efficiency of 2~3 times than the drill bit with welded solid carbide teeth, and the consumption of carbide is only one-tenth of the general drill bit. This kind of geological drill with crushed carbide surfacing welding has a self-sharpening effect.

2.Well stabilizer

The cemented carbide powder broken by machinery is mixed with the appropriate amount of flux and put into the 08 steel strip tube to make welding rods, and the welding rod is surfacing to the bar of the oil well stabilizer, which greatly improves the service life of the stabilizer. The service life of the oil well stabilizer is increased by 2 times and 10 times, respectively. The service life of the stabilizer surfacing with crushed cemented carbide is 1 time longer than that of the cast tungsten carbide electrode, and 15 times longer than that of the cobalt chromium tungsten electrode.

3. Body material of diamond drill bit

In our country, the body material of diamond drill has always been cast tungsten carbide. Since 1985, the North China Petroleum Administration has been casting tungsten carbide as the body material of diamond drill in our country. There are many advantages to using WC-Co particle alloy as the shadow material. Compared with casting tungsten carbide, the crushed carbide is more firm in the diamond embedding, more closely combined with the steel body, and the drill is more smooth and beautiful after machining.

4. Oil well fishing and milling tools

The welding rod is made of crushed cemented carbide and elastic nickel silver alloy filler metal, and then surfacing to oil well fishing and milling tools with oxyacetylene flame, which plays a very large role in oil drilling. 

5. Dip surfacing of blast furnace bell

The blast furnace bell is constantly subjected to the friction of iron ore, coke and limestone, and the wear is very serious. In the past, high chromium cast iron welding rods have been used to reduce the wear of the bell. A blast furnace bell with a diameter of 5 meters and a volume of 5000 cubic meters was impregnated and surfacing with cemented carbide. The service life of blast furnace bell surfacing with this method is 3~8 times longer than that with high chromium cast iron electrode.

6. Saw blade without teeth

This saw blade has no serration, and its cutting edge is made up of countless bits of cemented carbide brazed onto a sheet of tool steel. This saw blade is sharp and can cut many of the most difficult materials, efficiently and economically.

7. Cast hammer head and steel ball

The crushed cemented carbide is spread in the casting mold, the molten steel is injected and the crushed cemented carbide is combined together to cast various geometric sizes of wear-resistant parts. This kind of cast and inlaid parts - generally use 20~30 or 40~60 mesh of granular cemented carbide, cast and inlaid with cast steel is best to use manganese steel.

8. Steel cemented carbide composite material

The crushed WC-Co alloy powder and steel powder are mixed evenly, pressed and burned, and then impregnated with copper alloy to make composite materials. The wear-resistant parts made of this material have good mechanical properties and wear resistance.

9. High wear resistance bearing

Coarse crystal WC powder and WC-CO granular alloy are mixed evenly at a ratio of 60:40, coated on the steel bearing body, and then impregnated with copper base filler metal, and machined to become a bearing with high wear resistance.

10.Thermal spray welding hard phase additives

The thermal spray welding technology of self-fluxing alloy powders such as iron, nickel and cobalt is in the ascendant. In the above various self-fusing alloy powder, add a certain amount of 150-320 mesh granular cemented carbide powder, and then spray welding, due to the carbide particles dispersed in the spray welding layer, the wear resistance of the spray welding layer is increased exponentially. For example, the exhaust fan blade made of medium carbon steel can only be used for 4 months, and the service life is increased to 16 months after coal injection with nickel-based self-fusing alloy powder with 50% crushed cemented carbide powder. The scraper of low alloy steel mixer, the original life is only 2 months, and the service life is extended to 12 months after spray welding with the above powder.

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