A kind of sintering method and sintering tooling of molded hard alloy long pipe fittings

A technology of cemented carbide and sintering method, which is applied in the field of cemented carbide manufacturing to achieve the effect of ensuring the quality of the shape

Inactive Publication Date: 2017-02-01
成都科力铁硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the molded tubular cemented carbide sintered product twists and shrinks into a parallelogram in the axial vertical section, and provides a sintering method and sintering tool for molded cemented carbide long pipes to eliminate and control it. This deformation can effectively guarantee the appearance quality of the product.

Method used

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  • A kind of sintering method and sintering tooling of molded hard alloy long pipe fittings
  • A kind of sintering method and sintering tooling of molded hard alloy long pipe fittings
  • A kind of sintering method and sintering tooling of molded hard alloy long pipe fittings

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Experimental program
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Effect test

Embodiment 1

[0039] The cemented carbide grade is YG6, and the sintering temperature is 1450°C.

[0040] The shaft sleeve product of cemented carbide has a length of 25.6mm and an inner diameter of 15.2mm.

[0041] The graphite boat plate 100 has a thickness of 8 mm.

[0042]Put the YG6 mixture into the mold and carry out two-way pressing according to the conventional pressing process. The height H of the first liner product section 310 is 27mm, and the diameter D of the inner liner parts 311 and 313 is 15.2mm. Put the sintered graphite boat plate 100 into the boat plate support Section 320 has a diameter d of 10mm and a height h of a cylindrical lined graphite core 300 of 7mm. Then the lined product section 310 is ring-cut. The depth S of the groove is 0.4 mm. A through hole with a diameter d1 of 10.3 mm is opened on the sintered graphite boat plate 100 , that is, the graphite core installation hole 110 . Insert the processed boat plate support section 320 lined with the graphite core ...

Embodiment 2

[0044] The cemented carbide grade is YN8, and the sintering temperature is 1450°C.

[0045] The shaft sleeve product of cemented carbide has a length of 52.0mm and an inner diameter of 27.0mm.

[0046] The graphite boat plate 100 has a thickness of 8mm.

[0047] Put the YN8 mixture into the mold and carry out two-way pressing according to the conventional pressing process. The height H of the first liner product section 310 is 54 mm, and the diameter D of the inner liner parts 311 and 313 is 27.0 mm. Put the sintered graphite boat plate 100 into the boat plate support Section 320 has a diameter d of 16 mm and a height h of a cylindrical lined graphite core 300 of 7 mm. Then the lined product section 310 is ring-cut, and the uncut parts at both ends, that is, the length of the inner liner 311, 313 is 10 mm. The depth S of the groove is 0.6 mm. A through hole with a diameter d1 of 16.4 mm is opened on the sintered graphite boat plate 100 , that is, the graphite core installati...

Embodiment 3

[0049] The cemented carbide grade is YG8, and the sintering temperature is 1430°C.

[0050] The shaft sleeve product of cemented carbide has a length of 180.0mm and an inner diameter of 112.0mm.

[0051] The graphite boat plate 100 has a thickness of 8mm.

[0052] Put the YG8 mixture into the mold and carry out two-way pressing according to the conventional pressing process. The height H of the first liner product section 310 is 183.0 mm, and the diameter D of the inner liner parts 311 and 313 is 112.0 mm. Put the sintered graphite boat plate 100 into the boat plate The diameter d of the support section 320 is 75.0 mm, and the height h is a cylindrical lined graphite core 300 of 7 mm, and then the lined product section 310 is ring-cut, and the uncut parts at both ends, that is, the length of the inner liner 311, 313 is 20mm, the depth S of the groove is 1.5mm. A through hole with a diameter d1 of 75.5 mm is opened on the sintered graphite boat plate 100 , that is, the graphi...

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Abstract

The invention discloses a sintering method and a sintering tooling for a molding pressed hard alloy long pipe fitting. The sintering method comprises the following steps that a, firstly, a hard alloy mixture is loaded into a mold and is subjected to bidirectional pressing through a pressing process; b, each inner liner graphite core is inserted into a corresponding graphite core installing hole of a graphite boat plate; c, a press blank of the hard alloy pipe fitting subjected to molding pressing is arranged on an inner liner product section of the inner liner graphite core in a sleeving way, and then, sintering is carried out through a sintering process; d, after the sintering is completed, the inner liner graphite core is removed, and then, the inner circle of the hard alloy pipe fitting is subjected to sand blasting processing. The hard alloy long pipe fitting is sintered through the sintering tooling provided by the invention, the annular groove part in the middle of the inner liner graphite core can effectively avoid the contraction of the press blank, and the twisting deformation of the product during the sintering is prevented.

Description

technical field [0001] The invention belongs to the technical field of hard alloy manufacturing, and in particular relates to a sintering method and a sintering tool for molded hard alloy long pipe fittings. Background technique [0002] The cemented carbide manufacturing process mainly consists of three parts: mixture preparation, forming and sintering. Conventional forming methods mainly include compression molding, isostatic pressing, extrusion and injection molding. Due to the friction of the mold wall in compression molding, the pressing pressure will drop along the pressing direction. The pressing pressure is directly proportional to the density of the cemented carbide compact, the higher the pressing pressure, the higher the density of the cemented carbide compact, and the smaller the pressing pressure, the lower the density of the cemented carbide compact. The cemented carbide compact will shrink during sintering, and the sintering shrinkage coefficient of the ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/12B22F3/16
Inventor 苏华谷亩
Owner 成都科力铁硬质合金有限公司
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