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Special-shaped boat for controlling sintering flexural deformation of long trumpet-shaped hard alloy nozzle pipe

A hard alloy, bending deformation technology, applied in the field of hard alloy manufacturing, can solve problems such as bending deformation, achieve good bending deformation, and control the effect of bending deformation

Active Publication Date: 2013-10-30
四川科力特硬质合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of bending deformation existing in the sintering process of the existing hard alloy long pipe with horn-shaped nozzle, so as to provide a double bus bar clamping card that can realize the axial and horn mouth parts in the whole sintering process. Special-shaped boats with bit support to control the sintering and bending deformation of cemented carbide long pipes with bell mouths

Method used

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  • Special-shaped boat for controlling sintering flexural deformation of long trumpet-shaped hard alloy nozzle pipe
  • Special-shaped boat for controlling sintering flexural deformation of long trumpet-shaped hard alloy nozzle pipe
  • Special-shaped boat for controlling sintering flexural deformation of long trumpet-shaped hard alloy nozzle pipe

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Effect test

Embodiment 1

[0055] Such as Figure 9 The shape and material are YG6, and the bell mouth long pipe is sintered. The boat material is made of graphite with a high degree of graphitization, a bright iron black color, a semi-metallic luster, a smooth and greasy feel, and a low knocking sound. The roughness of the V-groove is above 0.8, which can reduce the bending deformation of the blank caused by frictional resistance during the cooling and contraction process.

[0056] Assume Figure 9 The one-half taper angle β of the long pipe with the shape of the bell mouth is 20°, and the angle α is set to 50°. According to the formula:

[0057] tgγ=tgβ / Sinα tgγ=tg20° / Sin50°

[0058] Calculated: γ=25.41°

[0059] tgθ=tgα / Cosγ tgθ=tg50° / Cos25.41°

[0060] θ=52.84°

Embodiment 2

[0062] Assume Figure 9 The one-half taper angle β of the horn-shaped long pipe is 10°, and the α angle is set to 45°. According to the formula:

[0063] tgγ=tgβ / Sinα tgγ=tg10° / Sin45°

[0064] Calculated: γ=14°

[0065] tgθ=tgα / Cosγ tgθ=tg45° / Cos14°

[0066] θ=45.864°

[0067] According to the above-mentioned α, β, γ and θ values, the special-shaped boat suitable for the sintering of the tungsten carbide bell mouth long pipe is manufactured. At any moment during the cooling and contraction process of the blank, there are two different busbars and two busbars at both ends of the blank. The V-shaped grooves of the special-shaped boat are supported by contact, so the bending deformation of the blank is controlled. In the actual production process, as long as the graphite boat material is properly selected, the roughness of the V-shaped groove is above 0.8, and the product length is within 250mm, most of its bending deformation can be controlled within 0.5.

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Abstract

The invention discloses a special-shaped boat for controlling the sintering flexural deformation of a long trumpet-shaped hard alloy nozzle pipe, which relates to the technical field of manufacturing of hard alloys and is used for solving the technical problem of flexural deformation during sintering of the conventional long trumpet-shaped hard alloy nozzle pipe product. The special-shaped boat for controlling the sintering flexural deformation of the long trumpet-shaped hard alloy nozzle pipe consists of a V-shaped boat A and a V-shaped boat B, wherein the upper surface of the V-shaped boat A is provided with a V-shaped groove A (3); the upper surface of the V-shaped boat B is provided with a V-shaped groove B (4); the V-shaped bottom line and the bottom plane of the V-shaped groove A (3) form an angle gamma; the V-shaped bottom line of the V-shaped groove B (4) is parallel to the bottom plane of the V-shaped boat B; the axial projection angle of the opening of the V-shaped groove A (3) is consistent with the opening angle 2alpha of the V-shaped groove B (4); and the high point of the V-shaped bottom line of the V-shaped groove A (3) is connected with the V-shaped bottom line of the V-shaped groove B (4), and V-shaped openings of the V-shaped groove A (3) and the V-shaped groove B (4) are connected with each other.

Description

technical field [0001] The invention relates to the technical field of cemented carbide manufacturing, in particular to a special-shaped boat for controlling the sintering and bending deformation of long carbide horn-mouthed pipes. Background technique [0002] The manufacturing process of cemented carbide products mainly consists of three parts: mixture preparation, forming and sintering. The main factors causing the sintering deformation of the blank are the density uniformity of each part of the compact and the arrangement of the compact sintering boat. The density of each part of the compact is different, and the shrinkage coefficient of each part of the compact is different during sintering. The forming method of the trumpet-shaped nozzle long pipe compact is usually extrusion and isostatic pressing, and then processed into a trumpet-shaped nozzle long pipe compact. The density of each part of the green compact by extrusion and isostatic pressing is basically the same...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/12B22F3/16
Inventor 谷亩田荣周苏华
Owner 四川科力特硬质合金股份有限公司
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