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5 августа 2021 г. 10:48

What Is Tungsten Carbide Precision Part Machining Technology

carbide precision parts

Cutting is one of the common methods used in a tungsten carbide rod, carbide sheet and cemented carbide wire. For cutting the material of 1 mm or less, diamond ultra-thin cutting pieces are commonly used for machining.

The diamond resin matrix cutting piece, wherein the outer ring belt is a resin binding agent abrasive working layer, and the central portion is a high-strength metal, mostly for medium, large cutting slots and cutting.

During the tungsten carbide machining, the cutter tool itself must be higher than the hardness of the machined workpiece. At present, the cutting tool materials for turning tungsten carbide parts are mainly made of high-hardness high-resistant non-metallic adhesive CBN and the diamond PCD.

1. The tungsten carbide components which have a hardness of less than HRA90, select the BNK30 material CBN tool to carry out a large amount of turning and the tool is not broken. The carbide components which have a hardness greater than HRA90 generally select CDW025 Material PCD cutter tool or grinding with a diamond grinding wheel adopting a resin binding agent.

2.To process R3 groove or more of the carbide precision parts, for large machining allowance, generally adopts BNK30 CBN tool for roughing processing, then grinding with grinding wheels. For small processing margins, the grinding can be done directly with wheels , or adopting PCD tool for flush processing.

3.When the crescent groove rib of the tungsten carbide roller is processed, the CDW025 diamond carving milling cutter tool also known as rotary milling cutter is adopted.

For the milling process of carbide parts, according to customer needs, CVD diamond coating milling cutters and diamond insert milling cutter can be provided to perform tungsten carbide precision parts machining, which can replace electrolytic corrosion technology and electric spark process, improving production efficiency and product quality, such as a CVD diamond coating milling cutter to micro-milling the cemented carbide, and the surface roughness can reach 0.073 μm.

What Are The Factors Affecting The Machining Accuracy Of Tungsten Carbide Part

1. Machine tool error

The machine tool error refers to the manufacturing, installation errors and wears of machine tools. It mainly includes guide error of machine tool guide rail, machine tool spindle rotation error, transmission error.

2. Machining principle error

The machining principle error refers to an error generated by adopting the approximate blade profile or approximate transmission relationship for machining. The principle error often occurs in a thread, gear, complex surface machining.

3. Residual stress inside the workpiece

The residual stress is generated during the blank manufacturing, heat treatment process, cold strengthening and cutting processes.

4.Machining environment

The machining site often has many small chips. If there is a part locating surface or location of locating hole, which affects the processing accuracy of the parts, for high-precision processing, some small particles will affect the accuracy.

5.Manufacturing error and wear of the fixture

The error of the fixture is mainly referred to as the manufacturing error of positioning elements, tool guiding elements, an indexing mechanism. The fixture is assembled, with the relative dimensional error between the various components and worn on the working surface during use.

6.Manufacturing errors and wear of tools

The influence of tool error on machining accuracy varies according to the type of tools.

7.Thermal deformation of the processing system

During the machining process, due to the internal heat source, such as cutting heat, frictional heat or an external heat source such as temperature, heat radiation, the processing system is modified, thereby affecting the machining accuracy. In large workpieces and precision machining, the processing error caused by the thermal deformation of the processing system accounted for 40% -70% of the total processing error.

For more detailed information, please visit the article page of tungsten carbide precision part machining technology.

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Автор: Статус: offline pinkledstone
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