Sintering tool clamp used for hard alloy thin-wall part spraying pipe product

Abstract

The invention discloses a sintering tool clamp used for a hard alloy thin-wall part spraying pipe product. The clamp comprises at least two holding clamps, a spraying pipe is of a structure with two large ends and the small middle, during clamping, the holding clamps are arranged on the periphery of the spraying pipe in a surrounding and holding manner, the neck, close to the upper, of the middleof the spraying pipe is tightly held, the spraying pipe and a clamp are integrally inserted into corresponding hanging holes, and finally, through sintering, the spraying pipe product is obtained. Theinner diameter of the hanging holes is reduced through the holding clamps, the rejection rate of the product is reduced, meanwhile, secondary sintering is not needed, the production efficiency can beimproved, and energy consumption and product cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy sintering molding, in particular to a sintering fixture used for a carbide thin-wall nozzle product. Background technique [0002] In the prior art, the cemented carbide thin-wall nozzle series products are generally produced by powder metallurgy sintering technology. In the entire production process control process, sintering is the last major process that plays a decisive role in its performance, so the cost of the sintering process It is an important part of the product cost; when sintering, the nozzle blank is hoisted and sintered through a special mesh hanger ( figure 1 As shown), due to the certain sintering shrinkage coefficient of powder metallurgy products, the nozzle will fall off from the hanger due to the overall shrinkage and gravity during high-temperature sintering, resulting in product damage (such as figure 2 shown), so in order to reduce the scrap rate, the prior art ...

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Problems solved by technology

[0002] In the prior art, the cemented carbide thin-wall nozzle series products are generally produced by powder metallurgy sintering technology. In the entire production process control process, sintering is the last major process that plays a decisive role in its performance, so the cost of the sintering process It is an important part of the product cost; when sintering, the nozzle blank is hoisted and sintered through a special mesh hanger ( figure 1 As shown), due to the certain sintering shrinkage coefficient of powder metallurgy products, the nozzle will fall off from the hanger due to the overall shrinkage and gravity during high-temperature sintering, resulting in product damage (such as figure 2 shown), so in order to reduce the scrap rate, the prior art generally adopts a secondary sintering method. This method first reduces the sintering temperature when the sintering reaches a certain level, so that the product is partially shrunk, and after it is released from the furnace, replace the corresponding size The mesh hangs the plate for secondary sintering; although it can reduce the scrap rate, its disadvantage is that the sintering cycle is long, and because the timing of cooling is not easy to grasp, the phenomenon of product falling has not been fundamentally changed, and the scrap rate still higher

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