Process for preparing tungsten parts and components with complicated shape and high dimensional accuracy
A technology of dimensional accuracy and complex shape, which is applied in the field of preparing tungsten parts with complex shape and high dimensional accuracy, to achieve the effects of consistent shrinkage, reduced risk of deformation, and high dimensional accuracy
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Embodiment 1
[0016] The tungsten powder was ball milled in a high-energy ball mill for 4 hours. The binder was composed of 60% paraffin wax, 25% high-density polyethylene, 10% polypropylene and 5% stearic acid. The volume ratio of the powder was 56%. The powder was mixed with After the binder is mixed on the SK-160 open rubber mixing machine, it is then granulated on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine, and the injection temperature is 160 ℃, the injection pressure is 90MPa, the obtained injection body is extracted and degreased in trichlorethylene for 4 hours, then dried at 60 ℃ for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 8 hours, and the degreasing The blank is pre-sintered in a hydrogen furnace at 1300°C for 1 hour, and then placed in a medium-frequency induction furnace for sintering. The sintering temperature is 2300°C, a...
Embodiment 2
[0018] The tungsten powder was ball milled in a high-energy ball mill for 6 hours. The binder was composed of 55% paraffin wax, 25% high-density polyethylene, 15% polypropylene and 5% stearic acid. The volume ratio of the powder was 56%. The powder was mixed with After the binder is mixed on the SK-160 open rubber mixing machine, it is then granulated on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine, and the injection temperature is 160 ℃, the injection pressure is 100Mpa, the obtained injection body is extracted and degreased in trichlorethylene for 2 hours, then dried at 60 ℃ for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 8 hours, and the degreasing The blank is pre-sintered in a hydrogen furnace at 1300°C for 1 hour, and then placed in a medium-frequency induction furnace for sintering. The sintering temperature is 2300°C, ...
Embodiment 3
[0020] The tungsten powder was ball milled in a high-energy ball mill for 8 hours. The binder was composed of 50% paraffin wax, 25% high-density polyethylene, 15% polypropylene and 10% stearic acid. The volume ratio of the powder was 54%. The powder and After the binder is mixed on the SK-160 open rubber mixing machine, it is then granulated on the PSJ32 mixing extruder to make the feeding more uniform, and the feeding is injected on the CJ80-E injection machine at an injection temperature of 150 ℃, the injection pressure is 100Mpa, the obtained injection body is extracted and degreased in trichlorethylene for 4 hours, then dried at 60 ℃ for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 6 hours, and the degreasing The blank is pre-sintered in a hydrogen furnace at 1300°C for 1 hour, and then placed in a medium-frequency induction furnace for sintering. The sintering temperature is 2300°C, and the sintering...
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