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Method for producing iron-base powder additive from steel powder generated by polishing steel balls of bearing

A technology of rolling bearings, iron-based powders, applied in the above-mentioned additive field

Inactive Publication Date: 2005-03-23
杨宗坡 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of the application of chromium element in powder metallurgy, and the problem of reuse of steel ball grinding steel powder in bearing factories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: the iron powder additive of the present embodiment contains the composition of following percentage by weight: C (0.9~1.2), Cr (1.4~1.6), Fe (97.2~97.7), the manufacture method of above-mentioned iron powder additive is as follows The steps are carried out: (1) get the steel ball light grinding steel powder, which contains the following compositions in weight percentage: C (1.85), Si (0.29), Mn (0.16), P (0.074), S (0.029), Cr ( 1.47), acid insoluble matter (0.11). The steel powder is washed with water and dehydrated, the water content of the dehydrated steel powder is 6-10%, and the steel powder is dried at 120° C. for 20-40 minutes. (2) Use a blender to grind the dried steel powder into powder. (3) Put the powdered steel powder into a roasting boat and roast it in a roasting furnace. Roasting is at H 2 Under the protection of , bake at 900-940°C for 10-30 minutes. (4) Break the roasted steel powder with a crusher, and then pass it through ...

specific Embodiment approach 2

[0005] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the steel ball polishing powder used in its manufacturing method contains the following components by weight percentage: C (5.89~6.94), Si (0.29), Mn (0.16 ), P (0.078), S (0.029), Cr (1.60), the roasting time of the above-mentioned steel ball light grinding steel powder is 60 minutes, and its C content reaches 0.94% after roasting, which becomes the required iron powder additive. Other process conditions and steps are the same as those in Embodiment 1.

specific Embodiment approach 3

[0006] Embodiment 3: In this embodiment, the co-reduced Cr-containing powder is made by using the iron powder additive produced in Embodiment 1 and Embodiment 2. The specific steps are as follows: take 0-90 percent of the reduced hair powder and 10-100 percent of the iron powder additive according to weight percentage. The raw materials were mixed with a mixer for 1 hour, and then loaded into a boat for reduction, and the co-reduction was carried out in H 2 Under protection, reduce at 980°C for 1 hour. After reduction, crush it with a crusher, and then pass it through a -80 mesh sieve with a sieving machine. The sieved powder is ball milled with a ball mill to increase the bulk density of the product. The produced product is additive co-reduced Cr-containing powder.

[0007] The application of iron powder additive of the present invention, additive co-reduction containing Cr powder is as follows:

[0008] Application 1. Take water and atomize iron molybdenum hair powder 90...

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Abstract

A medium-strength iron powder reinforcer prepared from the steel dust generated by polishing steel balls of bearing contains C (0.9-1.2 wt.%), Cr (1.4-1.6) and Fe (97.2-97.7), and is prepared through washing the said steel dust in water, drying, kneading into powder, calcining at 880-940 deg.c for 10-60 min under protection of H2, and sieving by 200-250 meshes to obtain the product.

Description

Technical field: [0001] The invention relates to a method for producing an additive capable of increasing the strength of iron powder, in particular to a method for producing the additive by using steel balls in a bearing factory to lightly grind steel powder. Background technique: [0002] The strengthening elements commonly used in iron-based powder metallurgy are elements with low affinity for oxygen, such as Cu, Ni, Mo, etc. For elements with high affinity to oxygen, such as Cr, Mn and other elements with good strengthening effects, it is difficult to apply them in powder metallurgy because they are easy to oxidize. There is no way to reuse the chromium-containing steel balls in the bearing factory for light grinding, so they can only be thrown away as industrial waste, which causes waste and pollutes the environment. Invention content: [0003] The invention provides a method for producing iron-based powder additives by using smooth ground steel powder of rolling bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/00B22F9/04C22C38/18
Inventor 杨宗坡康敏
Owner 杨宗坡
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