Powder metallurgy die of efficient drainage structure

Abstract

The invention relates to the field of powder metallurgy, and particularly relates to a powder metallurgy die of an efficient drainage structure. The powder metallurgy die comprises a lower die, an upper die and a forming cavity, wherein the forming cavity is a closed containing cavity which is formed in a way that the upper die and the lower die are closed, a water absorption passage and an air flow passage are arranged above the forming cavity, one end of the water absorption passage is communicated with the forming cavity, and the other end of the water absorption passage is communicated with the air flow passage. Moisture in the powder metallurgy die is blown out of the die under the action of air flow, so that water in the die is drained in time, and the drainage resistance of the water absorption passage is reduced; additionally, extruded water is reduced at a late stage of forming, so that residual water in the forming cavity and the water absorption passage can be actively absorbed under the absorption action of the air flow, the drainage time when a part is formed is greatly extended, the forming efficiency of the powder metallurgy die is improved, and the probability that the residual water drips on the formed part from the forming cavity and damages are caused when the die is opened is greatly reduced.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy mold with an efficient drainage structure. Background technique [0002] In the field of powder metallurgy, it is necessary to press the powder material with moisture to form parts through molding dies. At present, wet powder molding machines are often used in China to complete the molding process of parts; the water needs to be discharged during the compression molding process after the injection of wet powder, that is, the slurry. Since the wet powder is a slurry-like raw material, it is required to form a closed cavity inside the forming mold, and at the same time, it is determined that the direction of water discharge is only upward. [0003] Existing wet powder molding machines all adopt the negative pressure water absorption method to discharge the moisture in the wet powder during molding. Such as figure 1 As shown, the forming mold includes an upper...

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Problems solved by technology

As a result, during the pressing process, the water in the wet powder enters the water storage chamber 30 above the cavity 10 through the drainage pipe 20, and stays in the water storage chamber 30 and the drainage pipe 20. After the parts are formed, the mold is opened, and the Water can only be discharged from the water suction port 40 provided on the upper half mold 11 under pressure, so this negative pressure water absorption method is only to achieve the purpose of separating metal powder and water during the part forming process; this drainage method, water The part discharge speed is slow. When the wet powder has a lot of water, the water cannot be completely separated from the powder, and the drainage efficiency is low, which prolongs the molding time.

In addition, since the water is temporarily stored in the water storage chamber 30 and the drainage pipe 20 of the upper half mold 11 after being discharged, the water discharged will only It will be sucked and discharged by negative pressure, but some water will always fall to the formed parts under the action of gravity, causing damage to the parts

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