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Preparation method for powder metallurgical steel collar ring of ring-twisting frame

A technology of twisting machine and metallurgical steel is applied in the field of preparation of powder metallurgy steel ring for ring twister, and can solve the problems of poor wear resistance of the ring, easily polluted yarn, short service life, etc. The effect of improving performance and life

Inactive Publication Date: 2013-09-25
陕西华夏粉末冶金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel collar produced with this material and process has poor wear resistance, the yarn is easily polluted, and the service life is short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production technology of present embodiment is realized like this:

[0016] The first step ingredients: 98.15% of 100-200-mesh reduced iron powder, 0.8% of 325-mesh natural flake graphite powder, 0.5% of 200-mesh molybdenum powder, 0.5% of 300-mesh tungsten powder, and 0.05% of No. 20 industrial engine oil;

[0017] The second step of mixing: according to the ratio of the first step, first mix No. 20 industrial engine oil and reduced iron powder, then add natural flake graphite powder, molybdenum powder and tungsten powder in sequence, and the mixing time is 45-60 minutes;

[0018] The third step of sieving: sieve the mixture of the second step with an 80 mesh screen;

[0019] The fourth step of forming: press the sieved mixture at 5.5T / cm 2 Pressure, for part blank forming, the density is 6.25g / cm 3 ;

[0020] The fifth step of sintering: place the formed steel ring blank on a silicon nitride backing plate for sintering, and enter the pre-sintering zone at 700°C...

Embodiment 2

[0024] The production technology of present embodiment is realized like this:

[0025] The first step ingredients: 96.65% of 100-200-mesh reduced iron powder, 0.8% of 325-mesh natural flake graphite powder, 1.0% of 200-mesh molybdenum powder, 1.5% of 300-mesh tungsten powder, and 0.05% of No. 20 industrial engine oil;

[0026] The second step of mixing: according to the ratio of the first step, first mix No. 20 industrial engine oil and reduced iron powder, then add natural flake graphite powder, molybdenum powder and tungsten powder in sequence, and the mixing time is 45-60 minutes;

[0027] The third step of sieving: sieve the mixture of the second step with an 80 mesh screen;

[0028] The fourth step of forming: press the sieved mixture at 5.5T / cm 2 Pressure, for part blank forming, the density is 6.25g / cm 3 ;

[0029] The fifth step of sintering: place the formed steel ring blank on a silicon nitride backing plate for sintering, and enter the pre-sintering zone at 700°C...

Embodiment 3

[0033] The production technology of present embodiment is realized like this:

[0034] Step 1 Ingredients: Ingredients: 100-200 mesh reduced iron powder 97.5%, 325 mesh natural flake graphite powder 0.8%, 200 mesh molybdenum powder 0.8%, 300 mesh tungsten powder 0.85%, No. 20 industrial engine oil 0.05%;

[0035] The second step of mixing: according to the ratio of the first step, first mix No. 20 industrial engine oil and reduced iron powder, then add natural flake graphite powder, molybdenum powder and tungsten powder in sequence, and the mixing time is 45-60 minutes;

[0036] The third step of sieving: sieve the mixture of the second step with an 80 mesh screen;

[0037] The fourth step of forming: press the sieved mixture at 5.5T / cm 2 Pressure, for part blank forming, the density is 6.25g / cm 3 ;

[0038] The fifth step of sintering: place the formed ring blank on a silicon nitride backing plate for sintering, and enter the pre-sintering zone at 700°C--800°C under the pr...

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Abstract

A preparation method for a powder metallurgical steel collar ring of a ring-twisting frame comprises the following steps: after mixing No.20 industrial engine oil and reduced iron powder, and adding natural flake graphite powder, molybdenum powder and tungsten powder in sequence, wherein the material mixing time is 45 to 60 minutes; using a screen mesh of 80 meshes to screen the mixture prepared at the second step; forming a part blank with the mixture under the pressure of 5.5-6.0 T / cm<2>, with the density of 6.25-6.35 g / cm<3>; sintering the formed steel collar ring blank on a silicon nitride base plate; then cooling and discharging the steel collar ring blank; carrying out the heat treatment and surface polishing to the steel collar ring according to the technical requirements of the part so as to reach design requirements. According to the powder metallurgical steel collar ring of the ring-twisting frame, provided by the invention, the specific principal element material graininess component and the special material prescription are adopted, the heat treatment surface hardness of the steel collar ring is HRA50 to 60, the friction coefficient is 0.03 to 0.04 Mu, the permeability Phi is equal to 500-800*10-12, and the usability and the service life are improved greatly.

Description

technical field [0001] The invention relates to a production technology of powder metallurgy mechanical parts, in particular to a preparation method of a powder metallurgy steel collar of a ring twisting machine. Background technique [0002] Powder metallurgy mechanical parts refer to mechanical structural parts, sliding bearings and friction materials manufactured by powder metallurgy. Such parts are widely used in the machinery manufacturing industry, especially in household appliances, automobiles, agricultural machinery, engineering machinery, general machinery, etc. industry. Compared with the same parts manufactured by conventional casting, forging and cutting, the parts manufactured by powder metallurgy have the characteristics of less, no cutting, energy saving, material saving, no environmental pollution, low cost, high efficiency, etc., and can produce special performance Materials and products that are difficult or impossible to produce with other processes. ...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F1/00B22F5/10C22C38/12
Inventor 雒克家王华亮林育阳李强周勇高源芦晶周宁
Owner 陕西华夏粉末冶金有限责任公司
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