Method for preparing large-size hard alloy

A hard alloy, large-size technology, applied in the field of large-size hard alloy preparation, can solve the problems of inability to prepare large-size hard alloy products, cannot guarantee the shape and size of products, and long production cycle of products, so as to save working hours, Reduced production cost and small amount of product grinding

Inactive Publication Date: 2012-10-24
株洲金鼎硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of high cost, long product production cycle, and inability to guarantee product shape and size in the production of large-size hard alloy products by isostatic pressing in the prior art, and the technology that large-size hard alloy products cannot be prepared by ordinary molding methods Problem, the present invention provides a method for preparing large-size cemented carbide with low production cost, greatly shortened production cycle, and simple process

Method used

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preparation example Construction

[0013] The invention provides a kind of preparation method of large-scale cemented carbide, comprising the following steps:

[0014] S1, firstly adopt the compression molding method to prepare several sections of small-sized cemented carbide blanks;

[0015] S2. Vacuum sintering each cemented carbide blank to obtain several sections of cemented carbide semi-finished products respectively;

[0016] S3. Carry out flat grinding on the end faces of each segment of hard alloy semi-finished products, and then butt the end faces of each segment of hard alloy semi-finished products in sequence, and make the adjacent two segments of hard alloy semi-finished products completely flat and adjacent Seamless contact between the two end faces;

[0017] S4. Carry out secondary vacuum sintering on several sections of cemented carbide semi-finished products after docking as a whole to obtain large-sized cemented carbide products; wherein, the highest temperature of the secondary vacuum sinteri...

Embodiment 1

[0031] Production of cemented carbide finished nozzle S1 with a height of 240mm, an outer diameter of 50mm and an inner hole of 30mm. According to the normal production process of cemented carbide, the cylindrical cemented carbide blank with a through hole in the center with a through hole in the center with a pressing height of 100.5mm, a compacted outer diameter of 62.5mm, and a compacted inner hole of 37.5mm is prepared by compression molding in three sections; The highest temperature in the vacuum sintering furnace is 1370°C for one vacuum sintering, the heating rate is 3°C / min, 150min at 320-540°C, 60min at 1350-1370°C, and 3 sections of cemented carbide with a height of 81mm Semi-finished products. Then, one end face of two sections of hard alloy semi-finished products I and III is ground flat, and the two end faces of the other one section of hard alloy semi-finished product II are ground to a roughness of 3.2, and then according to I, II, III Sequentially align the th...

Embodiment 2

[0033] Production of cemented carbide finished nozzles S2 with a height of 180mm, an outer diameter of 65mm and an inner hole of 30mm

[0034] According to the normal production process of cemented carbide, the cylindrical cemented carbide blank with a through hole in the center with a pressing height of 113mm, a compacted outer diameter of 81.25mm, and a compacted inner hole of 37.5mm is prepared by compression molding in two stages, and then vacuum-pressed respectively. The highest temperature in the sintering furnace is 1410 ° C for a vacuum sintering, the heating rate is 5 ° C / min, 250 min at 320-540 ° C, and 90 min at 1350-1410 ° C, to obtain two-stage cemented carbide semi-finished products with a height of 91 mm . Then, one end face of the two sections of hard alloy semi-finished products I and II is ground flat until the end surface roughness is 4.0, and then the two sections of hard alloy I and II semi-finished products are concentrically aligned so that the end fac...

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Abstract

The invention provides a method for preparing large-size hard alloy, which comprises the following steps of: (S1) preparing several segments of small-size hard alloy blanks by using a compression molding method; (S2) performing first vacuum sintering on each hard alloy blank to obtain a semi-finished hard alloy product; (S3) flat grinding the end face of each semi-finished hard alloy product, and successively butting the end faces; and (S4) performing second vacuum sintering on the several segments of entire butted semi-finished hard alloy products to obtain the finished large-size hard alloy product, wherein the highest temperature of second vacuum sintering is 1400-1420 DEG C, the heating speed in the second vacuum sintering process is 3-7 DEG C/min, and the temperature is maintained for 45-80 min after a liquid phase occurs during the second vacuum sintering process. The invention overcomes the limitation that the large-size hard alloy product can only be produced by isostatic pressing in the prior art. Compared with the isostatic pressing production method, the method provided by the invention has greatly reduced cost and greatly shortened production period, and the grinding amount of the product is small.

Description

technical field [0001] The invention relates to the field of hard alloy preparation, in particular to a method for preparing large-size hard alloy. Background technique [0002] At present, for cemented carbide products with large length and large volume, the methods adopted consistently at home and abroad are isostatic pressing production and vacuum sintering. In the production of isostatic pressing, there are the following disadvantages: 1. The product mold production cycle is long, and a set of isostatic pressing molds takes 15 to 20 days from production to trial production; 2. The mold is expensive, and a set of isostatic pressing molds The price of the product is generally above 6,000 yuan; 3. The production cycle of the product is long. Therefore, the isostatic pressing method in the prior art is generally only applied in mass production. [0003] For large-sized cemented carbide products with a small number of orders, such as valve-type cemented carbide products, if...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F3/16
Inventor 周锋
Owner 株洲金鼎硬质合金有限公司
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