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Preparation method of hard alloy pressed blank adapted to general mechanical processing

A cemented carbide and machining technology, which is applied in the field of preparation of cemented carbide green compacts, can solve the problem that cemented carbide formed compacts cannot be processed by conventional machining, etc., so as to reduce subsequent processing costs, improve processing efficiency, and improve The effect of utilization

Inactive Publication Date: 2015-04-22
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

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Problems solved by technology

[0005] The purpose of the present invention is to: aim at the problem that the cemented carbide formed compact in the prior art cannot be processed by conventional machining, to provide a method for manufacturing a cemented carbide compact that can be adapted to conventional machining, and to improve the quality of the compacted compact after pressing The blank is pre-sintered, and the pre-sintered compact can be processed into the required shape by conventional machining methods

Method used

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  • Preparation method of hard alloy pressed blank adapted to general mechanical processing
  • Preparation method of hard alloy pressed blank adapted to general mechanical processing
  • Preparation method of hard alloy pressed blank adapted to general mechanical processing

Examples

Experimental program
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Embodiment 1

[0032] Carbide grade: YG6.

[0033] YG6 is a hard alloy composed of 94% metal carbide tungsten carbide and 6% metal binder phase cobalt. The density of tungsten carbide is 15.6 g / cm3, and the density of cobalt is 8.9 g / cm3. The volume content of the junction metal cobalt is: 6÷8.9 / ﹙94÷15.6+6÷8.9﹦10.06﹪.

[0034] The preparation method of compact comprises the following steps:

[0035] a. According to the mass percentage content of 94% tungsten carbide and 6% cobalt, the YG6 cemented carbide mixture is prepared, and the green compact is made by isostatic pressing.

[0036] b. Put the formed compact into a vacuum sintering furnace for pre-sintering. Since the volume content of the binder phase metal cobalt is 10.06%, the sintering temperature is set at 875°C, and the holding time is 80 minutes. After the pre-sintering is completed, cool down to room temperature, the cemented carbide compact of the present invention is obtained.

[0037] refer to Picture 1-1 , 1-2, 1-3, choos...

Embodiment 2

[0046] Carbide grade: YN10.

[0047] YN10 is a hard alloy composed of 90% metal carbide tungsten carbide and 10% metal binder phase nickel. The density of tungsten carbide is 15.6 g / cm3, and the density of nickel is 8.9 g / cm3. The volume content of the junction metal nickel is: 10÷8.9 / ﹙90÷15.6+10÷8.9﹦16.30﹪.

[0048] The preparation method of compact comprises the following steps:

[0049]a. Prepare the YN10 cemented carbide mixture according to the mass percentage content of 90% tungsten carbide and 10% nickel, and make a green compact by isostatic pressing.

[0050] b. Put the formed compact into a vacuum sintering furnace for pre-sintering. Since the volume content of nickel in the binder phase is 16.30%, the sintering temperature is set at 865°C and the holding time is 75 minutes. Cool down after pre-sintering to room temperature, the cemented carbide compact of the present invention is obtained.

[0051] refer to figure 2 , choose artificial diamond tools, and machin...

Embodiment 3

[0059] Carbide grade: YG23C.

[0060] YG23C is a hard alloy composed of 77% metal carbide tungsten carbide and 23% metal binder phase cobalt. The density of tungsten carbide is 15.6 g / cm3, and the density of cobalt is 8.9 g / cm3. The volume content of the junction metal cobalt is: 23÷8.9 / ﹙77÷15.6+23÷8.9﹦34.37﹪.

[0061] The preparation method of compact comprises the following steps:

[0062] a. Prepare the YG23C cemented carbide mixture according to the mass percentage content of 77% tungsten carbide and 23% cobalt, and make a compact by molding and pressing.

[0063] b. Put the formed compact into a vacuum sintering furnace for pre-sintering. Since the volume content of the binder phase metal cobalt is 34.37%, the sintering temperature is set at 815°C, and the holding time is 60 minutes. After the pre-sintering is completed, cool down to room temperature, the cemented carbide compact of the present invention is obtained.

[0064] refer to Figure 3-1 , 3-2, select artific...

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Abstract

The invention discloses a preparation method of a hard alloy pressed blank adapted to general mechanical processing. The preparation method comprises the following steps: a, preparing a pressed blank by pressing a prepared hard alloy mixture through the die-casting and isostatic pressing forming processes; and b, pre-sintering the formed pressed blank at the temperature of 810 to 880 DEG C in a vacuum sintering furnace, maintaining the temperature for 60 to 80 minutes, and then cooling to reach the room temperature after the pre-sintering. According to the preparation method of the hard alloy pressed blank, the pressed blank formed by pressing is pre-sintered; the pre-sintered pressed blank has certain hardness and bending resistance and is relatively high in pressed performance, so that the hard alloy pressed blank can be effectively cut by turning, milling, drilling, boring and other general mechanical processing for further forming before being sintered, the subsequent processing allowance of the sintered product can be greatly reduced, the processing cost can be decreased, and the processing efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of hard alloy preparation, and in particular relates to a method for preparing a hard alloy compact that can be adapted to conventional mechanical processing. Background technique [0002] Cemented carbide is mainly composed of metal carbide hard phase powder and metal binder phase powder. The manufacturing process of cemented carbide mainly includes three parts: mixture preparation, compression molding and sintering. Compression molding methods mainly include compression molding, isostatic pressing molding, extrusion molding and injection molding. Compression molding, isostatic pressing molding and extrusion molding can generally only process compacts with relatively simple shapes. Although injection molding can process shapes Complicated compacts, but the cost of injection molds is high and the technology is immature, so injection molding can only produce some small products in large quantities. The poros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C22C1/05
Inventor 苏华谷亩
Owner 四川科力特硬质合金股份有限公司
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