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Vacuum sintering anti-bending method for hard alloy round bar material

A cemented carbide and vacuum sintering technology, which is applied in the field of cemented carbide sintering processing, can solve problems such as workpiece scrapping, and achieve the effect of improving quality and yield

Inactive Publication Date: 2015-02-18
DONGGUAN UNIV OF TECH +8
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, for cemented carbide, it generally includes refractory metal compounds and bonding metals, such as cobalt and nickel; in the cemented carbide processing industry, as an important sintering equipment, vacuum carbon tube sintering Furnaces are widely used; for cemented carbide, in the actual sintering process, the cemented carbide workpiece is easily bonded to the graphite boat used to hold the workpiece, which will cause the workpiece to be scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, a method for vacuum sintering and anti-bending of hard alloy round rods, including the following process steps, specifically:

[0028] a. Putting the cemented carbide raw materials mixed uniformly and mixed with glue into the extruder, and the extruder prepares a round cemented carbide bar blank through a forming die;

[0029] b. Place the cemented carbide round rod blank in a pressed graphite boat and dry it naturally in a ventilated environment; wherein, the pressed graphite boat is in the shape of a rectangular thin plate, and the upper surface of the pressed graphite boat is provided with a The pressed graphite boat extends in the length direction and has a V-shaped groove with a V-shaped cross section. The lower surface of the pressed graphite boat is a smooth structure, and the length of the pressed graphite boat is 1000mm-1200mm;

[0030] c. Take out the natural-dried hard alloy round bar blank from the V-shaped groove of the pressed graphite boat, ...

Embodiment 2

[0044] Embodiment 2, a method for vacuum sintering of hard alloy round rods to prevent bending, including the following process steps, specifically:

[0045] a. Putting the cemented carbide raw materials mixed uniformly and mixed with glue into the extruder, and the extruder prepares a round cemented carbide bar blank through a forming die;

[0046] b. Place the cemented carbide round rod blank in a pressed graphite boat and dry it naturally in a ventilated environment; wherein, the pressed graphite boat is in the shape of a rectangular thin plate, and the upper surface of the pressed graphite boat is provided with a The pressed graphite boat extends in the length direction and has a V-shaped groove with a V-shaped cross section. The lower surface of the pressed graphite boat is a smooth structure, and the length of the pressed graphite boat is 1000mm-1200mm;

[0047] c. Take out the natural-dried hard alloy round bar blank from the V-shaped groove of the pressed graphite boat...

Embodiment 3

[0061] Embodiment 3, a method for vacuum sintering of hard alloy round rods to prevent bending, including the following process steps, specifically:

[0062] a. Putting the cemented carbide raw materials mixed uniformly and mixed with glue into the extruder, and the extruder prepares a round cemented carbide bar blank through a forming die;

[0063] b. Place the cemented carbide round rod blank in a pressed graphite boat and dry it naturally in a ventilated environment; wherein, the pressed graphite boat is in the shape of a rectangular thin plate, and the upper surface of the pressed graphite boat is provided with a The pressed graphite boat extends in the length direction and has a V-shaped groove with a V-shaped cross section. The lower surface of the pressed graphite boat is a smooth structure, and the length of the pressed graphite boat is 1000mm-1200mm;

[0064] c. Take out the natural-dried hard alloy round bar blank from the V-shaped groove of the pressed graphite boat...

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Abstract

The invention discloses a vacuum sintering anti-bending method for a hard alloy round bar material. The vacuum sintering anti-bending method comprises the following processing steps: a, pressing and forming by an extruding machine; b, pressing graphite boat loaded blank for natural drying; c, trimming the blank; d, putting the blank in a degumming furnace along with a degumming presintering graphite boat for degumming presintering; e, machining the blank; f, coating anti-sticking coatings on the surface of the cover plate V-shaped groove of a graphite cover plate and the surface of the base plate V-shaped groove of a graphite base plate; g, naturally drying the anti-sticking coatings; h, sintering and loading the graphite boat loaded blank, and clamping the blank between the base plate V-shaped groove and the cover plate V-shaped groove; i, putting the blank in a vacuum sintering furnace along with the sintering loading graphite boat, and vacuumizing after the furnace door is closed; j, vacuum-sintering the blank; k, cooling to room temperature along with the furnace, so that the preparation of the round bar material is completed. Through the design of the processing steps, the bending rate can be effectively reduced, the phenomenon of bonding can be avoided, and the quality and the yield of the hard alloy round material can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of cemented carbide sintering processing, in particular to a method for vacuum sintering and anti-bending of cemented carbide round rods. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy; cemented carbide has high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc. A series of excellent properties, especially its high hardness and wear resistance, remain basically unchanged even at a temperature of 500 ° C, and still have high hardness at 1000 ° C. With the above excellent properties, cemented carbide is widely used in tool materials, such as turning tools, milling cutters, planers, drills, boring tools, etc. [0003] In addition, for cemented carbide, it generally includes refractory metal compounds and bonding metals, such as cobalt and nickel; in the ...

Claims

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Application Information

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IPC IPC(8): B22F3/10
Inventor 陈勇志钟守炎李荣泳叶静何伟锋陈海彬吴鹏杨宇辉
Owner DONGGUAN UNIV OF TECH
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