Quality control method for dewaxing sintering process of hard alloy roller

A quality control method and sintering process technology, applied in the field of cemented carbide preparation, can solve problems such as bubbling, loss, edge drop and corner drop, etc., to achieve the effects of reducing production costs, ensuring dewaxing efficiency, and improving production quality

Inactive Publication Date: 2019-03-12
蓬莱市超硬复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the lack of quality control methods at present, delamination cracks, unpressed, peeling, dirty, edge drop, surface decarburization, carburization, sticky materials, surface oxidation, etc. Bubbles and other defects, causing great impact and loss

Method used

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Embodiment Construction

[0027] Further describe the present invention below in conjunction with embodiment:

[0028] A kind of quality control method of cemented carbide roll dewaxing sintering process, comprises the following steps:

[0029] 1. Select the dewaxing pressure sintering integrated furnace or the dewaxing sintering integrated furnace as the dewaxing sintering equipment;

[0030] 2. Put the graphite core rod to control the inner hole size when the blank is sintered: when the inner diameter of the roll is dmm, the inner diameter of the graphite core rod is d-(2.0~3.0) mm; when the height of the roll is hmm, the height of the graphite core rod is h+ 8.0mm;

[0031] 3. Control the sintering conditions:

[0032] (1) The temperature is from room temperature to 240°C, the heating time is 30 minutes, the flow rate is 5m3 / h under H2 atmosphere, and the pressure is 20-30mbar;

[0033] (2) The temperature is 240°C, the holding time is 120min, the flow rate is 5m3 / h under H2 atmosphere, and the p...

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Abstract

The invention discloses a quality control method for a dewaxing sintering process of a hard alloy roller. The method comprises the following steps: 1, selecting dewaxing sintering equipment; 2, placing a graphite core bar to control the dimension of an inner pore when a pressed blank is sintered; and 3, controlling sintering conditions. Strict and precise quality control is available in each step.By controlling the inner pore diameter and height of the blank of the roller through the graphite core bar, controlling a positive pressure hydrogen atmospheric condition in the furnace in the dewaxing process and adopting a step heating mode of heating and insulating alternately, paraffin in the hard alloy roller pressure blank runs away totally in form of steam, so that the dewaxing efficiencyis ensured. The conditions of layered cracks and peeling of the product are also avoided. The temperature is raised after dewaxing for vacuum sintering, and argon is inflated in the later vacuum sintering stage for protective sintering, so that defects such as dirt, edge and corner falling, surface decarburization, carburization, material adhesion, surface oxidization and bubbling are avoided, theproduction quality of the hard ally roller is improved, the rejection rate is reduced, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of hard alloy preparation, and mainly relates to a quality control method in the dewaxing and sintering process of hard alloy rolls. Background technique [0002] The production process of cemented carbide generally includes three stages, including wet grinding and preparation, compression molding and dewaxing sintering. Among them, the selection of dragging sintering equipment, mold requirements and sintering conditions will affect the qualification rate of the final product and production costs. It is necessary to meet the technical requirements of the follow-up inspection and the material requirements of the finished product. This is the key factor that directly determines whether the production of cemented carbide rolls is smooth and the quality is stable. In order to meet the product quality and service life of finished rolls, quality control in the dewaxing and sintering stage is particularly important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10
CPCB22F3/101B22F2999/00B22F2201/013B22F2201/20B22F2201/11
Inventor 孙浩斌孙积海张华姚海滨赵成亮
Owner 蓬莱市超硬复合材料有限公司
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