Method of forming powder metallurgy tool steel

A molding method and technology of powder metallurgy, which is applied in the field of powder metallurgy tool steel molding, can solve the problems of low strength, toughness and other mechanical performance indicators, low production efficiency, and use restrictions, and achieve low material utilization and high production costs , The effect of uniform and fine tissue

Inactive Publication Date: 2014-11-05
HUNAN HUANYU POWDER METALLURGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ordinary powder metallurgy tool steel (high-speed steel) cold-pressed products, compared with casting-forging processing parts, have uniform and finer material structure, no segregation, and stable performance; Parts production; however, due to the existence of pores, the mechanical performance indicators such as strength and toughness are not high, and the use is thus limited
Hot isostatic pressing is used to make tool steel (high-speed steel) powder into a completely dense billet, and maintain a uniform and fine structure, and the strength performance can be greatly improved; Mechanical processing; coupled with the huge investment of hot isostatic pressing itself, the production efficiency is low, and the unit price of the steel billet is as high as several hundred yuan / kg, so the use is also quite limited

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  • Method of forming powder metallurgy tool steel
  • Method of forming powder metallurgy tool steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The forming method of powder metallurgy tool steel comprises the following steps:

[0028] Step 1. Carry out carbon reduction on water atomized tool steel (high-speed steel) Cr12Nb4MO1 powder at a vacuum degree of 5Pa and a temperature of 900°C, and then heat-preserve and anneal at a temperature of 780-820°C;

[0029] Step 2, add graphite lubricant in the tool steel (high speed steel) powder through reduction annealing, graphite lubricant selects DAG154 of Henkel Company, the carbon in graphite lubricant accounts for 2.3% (weight) of total weight, mix uniformly, vacuum Dry and sieve, so that the surface of the powder is evenly coated with a layer of graphite lubricant to aid in sintering, and then evenly mixed with paraffin molding agent to obtain a mixture;

[0030] Step 3. Mold the mixture in step 2 into a material blank or a part blank with a traditional powder metallurgy process. The relative density of the compact is 85%, and then pre-burn and dewax it at a tempera...

Embodiment 2

[0042] The forming method of powder metallurgy tool steel comprises the following steps:

[0043] Step 1. Carry out carbon reduction of water atomized tool steel (high-speed steel) Cr12Ni1MO0.5C2.0 powder at a vacuum degree of 10Pa and a temperature of 900°C, and then heat-preserve and anneal at a temperature of 780°C;

[0044] Step 2. Add graphite lubricant to the reduced annealed tool steel (high-speed steel) powder. The graphite lubricant is DAG154 from Henkel Company. The carbon in the graphite lubricant accounts for 0.5% (weight) of the total weight. Mix evenly and vacuum Dry and sieve, so that the surface of the powder is evenly coated with a layer of graphite lubricant to aid in sintering, and then evenly mixed with paraffin molding agent to obtain a mixture;

[0045] Step 3. The mixture in step 2 is molded into a material blank or a part blank by traditional powder metallurgy technology. The relative density of the compact is 70%. Temperature pre-burning dewaxing;

...

Embodiment 3

[0057] The forming method of powder metallurgy tool steel comprises the following steps:

[0058] Step 1. Carry out carbon reduction of water-atomized tool steel (high-speed steel) Cr12Nb6MO1.5 powder at a vacuum degree of 3Pa and a temperature of 950°C, and then heat-preserve and anneal at a temperature of 820°C;

[0059]Step 2. Add graphite lubricant to the tool steel (high-speed steel) powder through reduction annealing. The graphite lubricant is DAG154 from Henkel Company. The carbon in the graphite lubricant accounts for 3.0% (weight) of the total weight. Mix evenly and vacuum Dry and sieve, so that the surface of the powder is evenly coated with a layer of graphite lubricant to aid in sintering, and then evenly mixed with paraffin molding agent to obtain a mixture;

[0060] Step 3. Mold the mixture of step 2 into a material blank or a part blank with a traditional powder metallurgy process. The relative density of the compact is 85%, and then pre-burn and dewax it at a t...

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Abstract

The invention discloses a method of forming powder metallurgy tool steel. The method includes a first step of conducting carbon-reduction and anneal on water atomization tool steel powder under the vacuum condition, a second step of evenly coating the surface of the powder with a layer of graphitic lubricant assisting in sintering, and obtaining mixed material after paraffins forming agent is mixed in, a third step of manufacturing material blank or part blank by compression moulding forming of the mixed material and dewaxing, and a fourth step of sintering the material blank or the part blank by a vacuum-pressure furnace. The powder metallurgy tool steel (high-speed steel) produced by the method is even and fine in formation, relative density of the tool steel reaches 99.5% and the density is close to be fully compact. Material performance is excellent, the powder metallurgy tool steel is close to isostatic pressing tool steel (high-speed steel) material in physical and mechanical properties, and the method of forming the powder metallurgy tool steel has the advantage of being low in cost, free from cutting, high in efficiency and capable of massively producing parts the same with powder metallurgy.

Description

technical field [0001] The invention belongs to a metal material forming method, in particular to a powder metallurgy tool steel forming method. Background technique [0002] The commonly used tool steel (high-speed steel) is a casting-forging material. Due to the segregation of components, the structure is coarse and the mechanical properties are average. Moreover, a large amount of machining is required to make parts. Ordinary powder metallurgy tool steel (high-speed steel) cold-pressed products, compared with casting-forging processing parts, have uniform and finer material structure, no segregation, and stable performance; Parts production; however, due to the existence of pores, the mechanical performance indicators such as strength and toughness are not high, and the use is thus limited. Hot isostatic pressing is used to make tool steel (high-speed steel) powder into a fully dense billet, and maintain a uniform and fine structure, and the strength performance can be g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/00
Inventor 尹平玉温英汤晓壮喻海霞
Owner HUNAN HUANYU POWDER METALLURGY CO LTD
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