Tungsten Alloy Blanks Preparation Process(c)

The relative density of the blank (actual density and the theoretical density ratio) is greater than 90% when machinability, billet density at 92 ~ 94% good processing properties. Blooming hot rolling temperature between 1350 ~ 1500 ℃, the deformation process parameters blooming inappropriate choice, will produce stratification blank. Warm rolling start temperature of 1200 ℃, 8 mm thick hot rolled sheet, the warm rolling can reach 0.5 mm. Since tungsten plate deformation resistance, when the rolling roll barrel bending deformation, so that the sheet thickness unevenness in the width direction, or exchange when changing roll mill, the sheet may be due to non-uniform deformation of each part of cracking.

0.5 mm thickness of the sheet of plastic - brittle transition temperature or above room temperature is also, brittle sheets, should be 200 ~ 500 ℃ the sheet rolled into 0.2 mm. Late rolling, tungsten thin long pieces, in order to ensure uniform heating plate, often coated with graphite or molybdenum disulfide, heating plate is not only beneficial, but also the processing of lubrication.

Other Processing

The pipe can be sintered tungsten direct extrusion billets, extruded tube or slip squeeze tube has been spinning sintering. Spinning also produce tungsten shaped products. Large-diameter rods multi-extrusion or rolling production process.

Cutting

Tungsten hard and notch sensitive, cutting difficult, requiring the use of carbide cutting tools. To prevent cutting cracks, often the workpiece is heated to plastic - brittle transition temperature than cutting, and to strictly control the cutting operation program. Grinding tungsten requires a specific type of light grinding wheel, and needs to be cooled, otherwise it will crack. Thickness of 0.2 mm or more in front of tungsten sheet punching and shearing to be pre-heated over a certain thickness of the plate, not cut, often need to use the wheel cutting.




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