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Hot-pressing sintering method and mould for ceramic,hard metal products with holes

A cemented carbide, hot-pressing sintering technology, applied in molds, manufacturing tools, ceramic molding machines, etc., can solve the problems of high production cost, low productivity, and reduced product quality, and achieve low production cost, long mold life, and product quality. good quality effect

Inactive Publication Date: 2006-05-24
ZIGONG CEMENTED CARBIDE CORP
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Problems solved by technology

In this method, because the loose powder is added into the mold cavity and then hot-pressed and sintered to shape, impurities are easily brought in, resulting in a decrease in product quality, and there is a problem that the product with holes cannot be directly sintered, and the product is easy to stick to the mold cavity and damage the mold. Disadvantages, in addition, because the single mode can only produce 1 to 2 pieces at a time, there are defects of low productivity and high production cost

Method used

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  • Hot-pressing sintering method and mould for ceramic,hard metal products with holes
  • Hot-pressing sintering method and mould for ceramic,hard metal products with holes
  • Hot-pressing sintering method and mould for ceramic,hard metal products with holes

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Embodiment 2

[0022] This embodiment takes the production of φ16.5×8.5 ​​products as an example:

[0023] Si 3 N 4 The composite powder was cold-pressed into green blanks (blanks 6) with a central aperture of φ16.5×18mm and a central aperture of φ6.0mm, a total of 42 pieces, and each cavity was filled separately, and the blank loading and sintering methods were the same as in Example 1.

[0024] In the mold of this embodiment, the inner and outer diameters and heights of the outer mold cover 1 and the outer diameter and height of the inner mold cover 2 are the same as those in Example 1, and the mold cavity 8 is used in this embodiment. Seven cylindrical holes with a diameter of φ16.65mm The mold cavity, the upper and lower punches 3 and 7 are also seven punches with mandrel holes 4, the diameter of the punch is φ16.5mm, and the height is 50mm; the diameter of the partition 5 is φ16.5mm, and the thickness is 8mm. A total of 49; mandrel hole diameter φ5.4mm; mandrel 4 length 270mm, diamete...

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Abstract

The invention belongs to a hot-pressing sintering method and a mold for products with holes in ceramics and hard alloys. The method includes firstly cold-pressing the powder into a green body, coating with a release agent, installing it on each layer of the hot-pressing mold and piercing the mandrel, loading the upper and lower punches, and then placing it in a hot-pressing mold. The machine is hot-pressed and sintered at 10-50MPa pressure and 1200°-2000°C. The mold includes a mold sleeve, a partition and a mandrel arranged in the mold cavity, and upper and lower punches. The invention adopts multi-layer, multi-layer hot-press molds to be sintered and formed on a hot press machine, which has the advantages of not being easy to bring in impurities during the production process, good product quality, neat appearance, and more than 100 products with holes can be hot-pressed and sintered at one time , the production cost is low, the production efficiency can be increased by ten to dozens of times compared with the background technology, and the mold life is long. It overcomes the drawbacks of the background technology, such as directly adopting powder hot-pressing sintering, poor product quality, low productivity, high production cost, and short service life of molds.

Description

technical field [0001] The invention belongs to a ceramic and hard alloy production method and a mold using the method, in particular to a hot-pressing sintering method using a single-mode multi-layer product with multiple holes in each layer and a mold used in the method. It is especially suitable for the production of ceramic and hard alloy inserts with holes. Background technique [0002] At present, the hot pressing sintering technology in the production of ceramic and hard alloy products is to directly add the powder of the product formula into the mold, and then indirectly or directly heat it on the hot press to 1200°~2000°C and press it under a pressure of 10~50Mpa. Sintering and molding, the formed blank is either ground or cut into round, square, triangular, rhombus and other finished products. In this method, because the loose powder is added into the mold cavity and then hot-pressed and sintered to shape, impurities are easily brought in, resulting in a decrease ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14B22F5/10B28B7/18B28B7/24B22F3/16B28B3/00B28B7/00C04B35/645
Inventor 李家杰郑直谭竹峰梅华
Owner ZIGONG CEMENTED CARBIDE CORP
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