Sintering process of products obtained by hard alloy paraffin production process

A production process, hard alloy technology, applied in the field of powder metallurgy industry, can solve the problems of paraffin removal peak curve mismatch, potential safety hazards, fast paraffin vaporization, etc., to improve vacuum and wax removal efficiency, improve paraffin recovery rate , the effect of reducing pollution

Active Publication Date: 2015-02-18
技锋精密刀具(马鞍山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the sintering process curve of cemented carbide production process products in the prior art, the temperature rises too fast, resulting in fast paraffin vaporization, and a long holding time, the internal and external paraffin of the product is vaporized at the same time, and a large amount of paraffin gas must be discharged from the product at the same time. Paraffin eliminates the mismatch of peak curves, causing problems such as skinning, deformation, cracks and potential safety hazards in products. The invention provides a sintering process for cemented carbide paraffin production process products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The sintering process of a cemented carbide paraffin production process product in this embodiment, the equipment uses an ordinary vacuum sintering integrated furnace, and is equipped with a paraffin recovery system. The paraffin recovery system includes a condensation device and a two-stage wax collection device outside the furnace body. And in the middle of the furnace body, there are 3 ports evenly arranged along the circumferential direction, among which: the condensing device and the two-stage wax collecting device are arranged at the front end of the furnace body and communicate with the 3 ports through pipes, the purpose is to make the inner tank in all directions The paraffin vapor can escape through the nearby interface, avoiding the situation of a single interface, there will be more paraffin residue at the part far from the interface, which is beneficial to all-round wax removal, improving the paraffin recovery rate, and prolonging the use of the vacuum sinteri...

Embodiment 2

[0057] The sintering process of a kind of cemented carbide paraffin production process product of the present embodiment, the equipment used and equipment configuration are the same as embodiment 1, the raw material for dewaxing is tungsten-titanium-cobalt cemented carbide, the production process is paraffin, and the amount of raw material paraffin is 2.5%. The loading capacity is 150 pieces, the largest product model is ￠346mm*￠237mm*3.35mm, and the total weight is 120 kg. The sample strip is 20mm*6.5mm*5.25mm, in line with GB / T 18376.2-2001 standard. The sintering process of a kind of cemented carbide paraffin production process product of the present embodiment, its steps are:

[0058] A. Negative pressure dewaxing, the temperature rise slope from 0°C to 150°C is 15°C / min, it takes 10 minutes, the vacuum degree is controlled within 50Pa, the carrier gas is argon, and the flow rate of argon is 0.7L / min;

[0059] B. Negative pressure dewaxing, 150 ℃ ~ 200 ℃ temperature rise ...

Embodiment 3

[0074] The sintering process of a kind of cemented carbide paraffin production process product of the present embodiment, the equipment used and equipment configuration are the same as embodiment 1, the raw material for dewaxing is tungsten titanium tantalum cemented carbide, the production process is paraffin, and the paraffin wax addition of raw material is 2.2%. The loading capacity is 150 pieces, the largest product model is ￠378mm*￠296mm*2.1mm, and the total weight is 110 kg. The sample strip is 20mm*6.5mm*5.25mm, in line with GB / T 18376.2-2001 standard. The sintering process of a kind of cemented carbide paraffin production process product of the present embodiment, its steps are:

[0075] A. Negative pressure dewaxing, the temperature rise slope from 0°C to 150°C is 12°C / min, it takes 12.5 minutes, the vacuum degree is controlled within 50Pa, the carrier gas is argon, and the flow rate of argon is 0.5L / min;

[0076] B. Negative pressure dewaxing, 150 ℃ ~ 200 ℃ temperat...

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Abstract

The invention discloses a sintering process of products obtained by a hard alloy paraffin production process and belongs to the technical field of sintering powder metallurgy hard alloy materials. The sintering process of the products obtained by the hard alloy paraffin production process comprises the steps of negative-pressure paraffin removal, vacuum sintering, partial-pressure sintering, rapid cooling and discharging, wherein during the paraffin removal process, the peak curve of the paraffin discharged from the alloy products is completely followed, different temperature-raising slopes are adopted in each stage so as to ensure that the paraffin gas is sequentially and slowly discharged from the alloy products at a constant speed. Hard alloy products prepared by the process disclosed by the invention cannot have problems of cracks, peeling, deformation, carburizing, decarbonization and the like caused by the sintering process; the recovery rate of the paraffin gas discharged from the products is high and can reach above 97%, the pollution to a hearth and a vacuum pump system is reduced and the service life of the device is prolonged; the process time is relatively short, the production benefits are improved, the energy source is saved, the cost is decreased and the market competitiveness is enhanced.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular relates to a sintering process of hard alloy paraffin wax production process products. Background technique [0002] Cemented carbide was introduced into my country in the 1960s, and now my country has become a major producer of cemented carbide in the world today. It has developed rapidly from production technology to production equipment, and gradually improved from the original "rubber process" to the present. The "paraffin process". [0003] Because cemented carbide is made by adding low melting point metal iron, cobalt, nickel, etc. When making products, a molding agent must be added that is easy to remove at around 400°C. Initially, butadiene rubber and butadiene rubber became the molding agent for "rubber technology". Although rubber can meet the molding requirements of the product, the composition of the rubber is complex, and it is inevitable to leav...

Claims

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Application Information

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IPC IPC(8): C22C1/05
Inventor 李光明
Owner 技锋精密刀具(马鞍山)有限公司
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