Powder metallurgy method and forming die for producing upper combining part

Abstract

The invention discloses a powder metallurgy method and forming die for producing an upper combining part. The powder material comprises, by weight, 2.5% of electrolytic copper powder, 1.0% of nickel carbonyl powder, 0.9% of graphite powder or carbon powder, 0.8% of zinc stearate and the balance water atomization iron powder, wherein the zinc stearate is lubricant. The main production procedures comprise powder mixing, forming, sintering, cemented quenching, cleaning drying and tempering. The principles of a powder feeding method and a powder discharging method are adopted, a powder feeding groove and a powder discharging groove are formed in a female die in the aspect of die designing, under the condition that not more operating systems of a molding press need to be added, the filling quantity of all positions of a pressed blank is changed to meet the compression ratio through the powder feeding method and the powder discharging method to guarantee that the formed pressed blank can have even density, the die is simplified, and the number of the operating systems of the press is reduced. Meanwhile, due to cleaning and drying after cemented quenching, a product can be bright and clean in appearance after being tempered and the surface of the product is golden yellow due to oxidation. In addition, the tissue inside the product is changed after tempering, and internal stress is removed.

Description

technical field [0001] The invention relates to a method and a molding die for producing an upper joint, in particular to a new powder metallurgy upper joint method and a molding die. Background technique [0002] Metal powder molding is to press metal powder into a high-density compact, and then sinter the compact to form a sintered metal product. The mechanical properties of the sintered metal product depend on whether the compact reaches the specified density and whether the density of each part is Uniform and consistent, the ratio of the punching filling amount of the lower die of each section of the mold to the thickness of the green compact accurately reaches the specified compression ratio e, and the density of the green compact is uniform. Theoretically, the number of tables on the end face of the compact requires a corresponding number of templates that can control its floating position, forming position, and demoulding position, so as to ensure that the density of ...

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Problems solved by technology

[0003] The upper joint is a kind of electric tool. The part can transmit torque by combining the end tooth with another end toothed part. It has 3 tables. The traditional powder metallurgy upper joint mold needs 3 lower molds. The corresponding next punch, lower second punch, and lower third punch are installed on the next template, the lower second template, and the lower third template of the mold base of the forming machine, which requires more operating systems to be added to the forming press, and the operation is more complicated. cumbersome

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