Customized Spherical Tungsten Carbide Buttons for Rock Drill Bits

Customized Spherical Tungsten Carbide Buttons for Rock Drill Bits

Cemented carbide is the best material for producing cemented carbide ball teeth widely used in medium and high pressure down-the-hole hammer drilling industry.

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Application

Cemented carbide ball teeth have their unique working properties, so they are widely used in oil drilling and snow shoveling, snow plow machines and other equipment.

Carbide mining ball teeth are also widely used as digging tools in quarrying, mining, and tunneling in civil buildings. In addition, it is also used as a drill bit accessory for heavy rock drills or deep hole drill tool accessories.

Our advantage

1. 100% virgin raw materials.
2. Various kinds of grades are available based on the customer's application.
3.we have a professional advanced production line and inspection equipment to ensure high-quality products.
4. Precision Ground and high polishing process.
5. High wear resistance, high hardness and impact toughness.
6. Advanced technology, precise grinding.

Production process

Tungsten carbide production
The APT (ammonium para-tungstate) is calcined into tungsten oxide under high temperatures. Subsequently, the oxide is reduced to tungsten metal in a hydrogen atmosphere. The metal powder is then mixed with carbon and carburied under inert atmosphere at high temperatures. The production parameters are decisive for the WC grain size in the sintered carbide.

Powder preparation
The tungsten carbide is intensely mixed with the binder metal cobalt, nickel or iron, various grain growth inhibitors and materials, which promote compaction, by wet grinding so that a homogeneous suspension is created. Afterward, the suspension is dried in a spray tower to produce a granulate with good flow characteristics. This granulate represents the basis for all forming processes.

Metal forming
The objective of the forming process is to obtain a net shape sample. Pressing is normally carried out at room temperature with pressures reaching up to several tons per square centimeter.

There are several ways of pressing blanks:
During isostatic cold pressing the powder is filled into an elasticflexible hose and pressed into a compacted form throughhigh liquid pressure. The powder blocks which are producedin this way can then be processed mechanically. All common machining methods like milling, cutting, drilling or turning maybe applied.In uniaxial pressing the pressing tool consists of a die and anupper and a lower punch. The carbide powder is filled into thedie and then compacted to create the so called green carbide,which is ejected from the pressing die.

Extrusion pressing is mainly used to produce rectangular bar or cylindrical rod, with or without axial hole(s). A plasticiser isadded to the powder. The resulting paste is pressed through an extrusion nozzle. Before sintering, the plasticiser must be evaporated in special drying furnaces. Metal Injection Moulding (MIM) is a process used to produce more complex forms which cannot be produced by direct pressing. The paste preparation is similar to the extrusion process.

Sintering process
The sintering process converts the blank into a homogeneous and dense carbide with a high level of hardness. The material is sintered at temperatures between 1,300 and 1,500 °C (liquid phase sintering) and sometimes also at high pressure (up to 100 bar). The volume is reduced by up to 50 % during this process.

Finishing
In order to achieve the final requirements of surface finish, tolerances,etc. carbide parts can be subjected to a series of finishing processes such as grinding, spark erosion and coating.

More products

The main products cover punching die, drawing die, die for military application, cemented carbide strips, rods, tubes, rotary files, cemented carbides for oil exploration, mining tools, sealing rings, brazed cemented carbide inserts, indexable cemented carbide inserts and CBN inserts, which are widely used in the fields of machinery, metallurgy, oil exploration, mining, construction, electronics, military, aerospace and aviation.