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Butt joint method for long powder metallurgy compressed billets

A powder metallurgy, long-size technology, which is applied in the field of long-size powder metallurgy compact butt jointing, can solve problems such as the inability to suppress the density of the compact, and the size of the cemented carbide product is too long, and achieve the same mechanical properties and consistent density.

Inactive Publication Date: 2015-12-23
ZHEJIANG HENGCHENG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a long-sized powder metallurgy compact butt joint method, which can effectively solve the problem that the cemented carbide product is too long to be compacted or the density in the middle of the compact is poor

Method used

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Embodiment Construction

[0012] A long-sized powder metallurgy compact butt joint method, comprising the following steps: first press the powder material with the grade YG15 and the wax ratio of 2.5% into two compacts with a diameter of 100mm and a height of 70mm through a mold, and the shrinkage coefficient is controlled at 1.3; Use a blade or other sharp tools to roughen the end faces of the two compacts, then evenly apply 100g of powder of the same brand on the end faces, then wrap several layers with PE film, and position the two compacts; put them in the cold In the isostatic press, pressurize to 120MPa, hold the pressure for 10 minutes, and complete the splicing of the compact.

[0013] After splicing, check whether there are cracks at the connection by turning, and then check the condition of the joint after wax removal to see if there is any crack. If there is none, put it into the furnace and heat it at 1430°C for 1.5 hours to make a finished product, and then inspect it to see if there are a...

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Abstract

The invention discloses a butt joint method for long powder metallurgy compressed billets. Materials are prefabricated into at least two compressed billets, and the compression coefficient of the compressed billets ranges from 1.25 to 1.35; butt joint faces of the compressed billets are subjected to roughening; and the butt joint faces of the compressed billets are evenly coated with powder with the same brand number with the compressed billets, then a soft film is used for wrapping every two adjacent compressed billets for locating, afterwards, the compressed billets are put in a cold isostatic press to be subjected to pressurizing and pressure maintaining, and the compression coefficient is lowered to be smaller than 1.21, so that the compressed billets are tightly combined. The butt joint method has the advantages that an original long compressed billet is divided into several small compressed billets which are compressed through molds, but the compression coefficient is not directly settled in one step, then the powder with the same brand number with the compressed billets is laid between every two adjacent compressed billets for cold isostatic pressing, and therefore the two compressed billets are bonded together to form a long compressed billet, and the design requirements are met; according to the method, existing short molds can be fully utilized, the compressed billet obtained through the butt joint method is consistent with a one-time formed compressed billet in mechanical property, and the consistent density of the whole compressed billet also can be guaranteed.

Description

technical field [0001] The invention relates to a method for butt jointing of long-sized powder metallurgy compacts. Background technique [0002] In the production process of cemented carbide products, it is often encountered that the length of the product required by the customer is long, and the existing mold cannot meet it. Even if it can be successfully suppressed, the density of the middle part of the product will be poor. After sintering, the middle part will shrink more than the two ends, and the middle part will be thinner, causing the size to be out of tolerance and the product to be scrapped. Contents of the invention [0003] The purpose of the present invention is to provide a method for butt jointing of long-sized powder metallurgy compacts, which can effectively solve the problem that the cemented carbide product is too long to be compacted or the density in the middle of the compact is poor. [0004] In order to solve the above-mentioned technical problems...

Claims

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Application Information

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IPC IPC(8): B22F3/02
Inventor 陈军金益民吴晓娜
Owner ZHEJIANG HENGCHENG CEMENTED CARBIDE
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