Gel centrifugal hard alloy bar forming machine and bar forming preparation method

A technology of cemented carbide rods and forming machines, which is applied in the field of forming cemented carbide rods. It can solve the problems of high void ratio of metal materials, failure to achieve the density and strength of cemented carbide, and low strength, so as to increase the solid content and Green body density, reduced cost and energy consumption, and high scrap rate

Inactive Publication Date: 2012-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the metal material prepared by the gel injection molding method has the disadvantages of high porosity and low strength, so the advantage of the gel injection molding lies in the preparation of ceramic materials and porous materials, but there are many deficiencies in the preparation of cemented carbide materials. Achieve the density and strength required for cemented carbide

Method used

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  • Gel centrifugal hard alloy bar forming machine and bar forming preparation method
  • Gel centrifugal hard alloy bar forming machine and bar forming preparation method
  • Gel centrifugal hard alloy bar forming machine and bar forming preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Implementation example 1: Preparation of φ8mm×200mm YG10 cemented carbide rod blank by water-based gel system

[0029] 1. Dissolve 7ml of acrylamide (AM) in 28ml of deionized water, add 14 drops of catalyst N,N,N,N'-tetramethylethylenediamine (TEMED), mix and stir until completely dissolved;

[0030] 2. Weigh 514g of YG10 hardened alloy mixed powder and add it to the prepared premix, and add 0.15wt% dispersant polyethyleneimine, stir and mix evenly, and the fluidity of the slurry is good;

[0031] 3. Assemble the molding agent, select the corresponding molding mold, add 14 drops of initiator ammonium persulfate to the prepared slurry, stir quickly, inject into the molding machine, and keep 5000rpm;

[0032] 4. The prepared green body was demolded and dried, the relative density of the green body was 59.4%, the density was uniform, and there was no delamination.

Embodiment 2

[0033] Implementation example 2: Preparation of φ15mm×200mm cemented carbide rod blank by water-based gel system

[0034] 1. Dissolve 24ml of acrylamide (AM) in 98ml of deionized water, add 48 drops of catalyst N,N,N,N'-tetramethylethylenediamine (TEMED), mix and stir until completely dissolved;

[0035]2. Weigh 1799g of YG10 hardened alloy mixed powder and add it to the prepared premix, and add 0.15wt% dispersant polyethyleneimine, stir and mix evenly, and the fluidity of the slurry is good;

[0036] 3. Assemble the molding agent, select the corresponding molding mold, add 48 drops of initiator ammonium persulfate to the prepared slurry, stir quickly, inject into the molding machine, and keep 6000rpm;

[0037] 4. The prepared green body is demolded and dried, the relative density of the green body is 59.7%, the density is uniform, and there is no layering phenomenon.

Embodiment 3

[0038] Implementation example 3: Preparation of φ8mm×200mm YG10 cemented carbide rod body with oil-based gel system

[0039] 1. Prepare a uniform solution with 17ml of hydroxyethyl methacrylate and 17ml of toluene as an organic solution, add 0.15g of catalyst benzoyl peroxide, mix and stir until completely dissolved;

[0040] 2. Weigh 530g of YG10 hardened alloy mixed powder and add it to the prepared premix, and add 0.15wt% hyperdispersant Solsperse-6000, stir and mix evenly, and the fluidity of the slurry is good;

[0041] 3. Assemble the molding agent, select the corresponding molding mold, add 14 drops of initiator ammonium persulfate to the prepared slurry, stir quickly, inject into the molding machine, and keep 5000rpm;

[0042] 4. The prepared green body was demolded and dried, the relative density of the green body was 60.4%, the density was uniform, and there was no delamination.

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Abstract

The invention provides a gel centrifugal hard alloy bar forming machine and a bar forming preparation method, wherein the method is characterized in that a hard alloy slurry is prepared by using a gel-casting method, and the forming of hard alloy bars is implemented by using a self-made gel centrifugal bar forming machine. The forming machine is composed of a support (1), a lower mold base (2), ahigh-speed adjustable DC (direct current) motor (3), a connecting flange plate (4), a molding mold (5), an upper mold base (9), a plastic pipe (8), a slurry spur (10), a filling hopper (11) and a hopper support (12); and the forming machine is characterized in that the mold for forming agents is of a split design and composed of a filling hole and a molding hole, and fixed by the upper and lower bases so as to facilitate the replacing of the mold; a blank is formed in the plastic pipe, therefore, the blank is easy to demold; and the forming machine is of a vertical design, therefore, the integration of filling, centrifugation, forming and solidification can be realized, and the industrial production of hard alloy bars can be realized. Compared with the traditional hard alloy extrusion molding machine, the gel centrifugal hard alloy bar forming machine provided by the invention has the advantages of low binder content, easiness in degumming, high finished product ratio and low cost.

Description

technical field [0001] The invention relates to a molding technology of cemented carbide rods, which belongs to the field of metal parts preparation in the powder metallurgy production process. In particular, a gel centrifugal rod forming machine is invented, which provides a tool for preparing cemented carbide rods. A low-cost, easy-to-operate, high-yield method. Background technique [0002] The production of traditional cemented carbide rods is made by mixing and extruding hardened alloy mixed powder and paraffin-based molding agent. Among them, the content of forming agent is as high as 5-10wt%, and it is difficult to degrease, and the degreasing waste rate is high, which directly leads to the increase of the production cost of cemented carbide rods, so the degreasing process has become a key field and problem in the production of cemented carbide rods. [0003] The gel injection molding process is based on the combination of traditional ceramic manufacturing process an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22D13/02
Inventor 郭志猛石永亮高学绪方哲成邵慧萍林涛郝俊杰罗骥杨栋华
Owner UNIV OF SCI & TECH BEIJING
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