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A two-stage dry mixing method for powder metallurgy iron-based mixed powder

A dry mixing and powder mixing technology, which is applied in the powder metallurgy industry, can solve the problems of irritating odor of hydrocarbon solvents, easy to block infusion pipelines, easy to corrode rubber parts, etc., so as to avoid environmental pollution and personal injury, and avoid blocking infusion Pipelines, the effect of high production efficiency

Active Publication Date: 2016-06-29
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopt the above-mentioned method to produce the problem that iron-based mixed powder mainly exists: 1, used hydrocarbon solvent generally has pungent smell, and harmful to human body
2. The volatiles of hydrocarbon solvents are discharged, polluting the production environment
3. The diluent of the polymer still has a good sol effect, which is easy to corrode the relevant rubber parts on the equipment
4. The polymer dilution becomes solid glue after drying, which is easy to block the infusion pipeline

Method used

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  • A two-stage dry mixing method for powder metallurgy iron-based mixed powder

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Embodiment 1

[0031] Such as figure 1 As shown, in terms of mass percentage, the production composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate iron-based mixed powder, 74 ~ 250μm ethylene polymer as binder The amount added is 0.3% of the total amount of raw materials. Add the weighed iron powder, copper powder, nickel powder, graphite powder, and binder powder into the 1# mixer and mix for 15 minutes, then put the materials in the 1# mixer into the 1# transfer bin; 1 # The material in the transfer bin is evenly spread on the steel belt of the heating furnace through the discharge port of the 1# transfer bin, with a thickness of 20mm; the temperature in the first zone of the heating furnace is 180°C, and the time for the material to pass through the first zone of the heating furnace is 6 minutes, and the material leaves the heating furnace The temperature of the steel belt is 85°C (the melting point of zinc stearate is 118°C), and it enters the 2# transfer bin with the belt conveyor; the ...

Embodiment 2

[0033] Such as figure 1 As shown, in terms of mass percentage, the production composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate iron-based mixed powder, 74 ~ 250μm ethylene polymer as binder The amount added is 0.2% of the total amount of raw materials. Add the weighed iron powder, copper powder, nickel powder, graphite powder, and binder powder into the 1# mixer and mix for 10 minutes, then put the materials in the 1# mixer into the 1# transfer bin; 1 # The material in the transfer bin is evenly spread on the steel belt of the heating furnace through the discharge port of the 1# transfer bin, with a thickness of 10mm; the temperature in the first zone of the heating furnace is 140°C, and the time for the material to pass through the first zone of the heating furnace is 2 minutes, and the material leaves the heating furnace The temperature of the steel belt is 85°C (the melting point of zinc stearate is 118°C), and it enters the 2# transfer bin with the belt conveyor; the ...

Embodiment 3

[0035] Such as figure 1 As shown, in terms of mass percentage, the production composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate iron-based mixed powder, 74 ~ 250μm ethylene polymer as binder The amount added is 0.5% of the total amount of raw materials. Add the weighed iron powder, copper powder, nickel powder, graphite powder, and binder powder into the 1# mixer and mix for 20 minutes, then put the materials in the 1# mixer into the 1# transfer bin; 1 #The material in the transfer bin is evenly spread on the steel belt of the heating furnace through the discharge port of the 1# transfer bin, with a thickness of 50mm; the temperature in the first zone of the heating furnace is 200°C, and the time for the material to pass through the first zone of the heating furnace is 10 minutes, and the material leaves the heating furnace The temperature of the steel belt is 85°C (the melting point of zinc stearate is 118°C), and it enters the 2# transfer bin with the belt conveyor; the ...

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Abstract

The invention discloses a two-stage dry mixing method for powder metallurgy iron-based mixed powder. The two-stage dry mixing method includes steps of 1), weighing iron powder, alloyed powder, graphite powder, lubricating agent and binding agent according to requirements of the iron-based mixed powder; 2), adding the weighed iron powder, alloyed powder, graphite powder, lubricating agent and binding agent to a 1# blender to be mixed for 10-20mins; 3), placing the materials in the 1# blender into a 1# transit warehouse; 4), paving the materials evenly on a steel belt and keeping the same in a high-temperature zone of a heating furnace at the temperature of from 140 DEG C to 200 DEG C for 2-10mins; 5), transferring the materials out of a cooling zone of the heating furnace and the temperature of which is dropped below melting temperature of the lubricating agent into a 2# transit warehouse; 6), further transferring into a 2# blender and adding the lubricating agent into the same; 7), starting up the 2# blender and the same to operate for 15-30mins; 8), transferring the materials into a 3# transit warehouse; 9), sieving and packaging to obtain qualified iron-based mixed powder. The two-stage dry mixing method has the advantages of reasonable design, environmental friendliness, high production efficiency, capability of mass production, and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular relates to a two-stage dry mixing method of powder metallurgy iron-based mixed powder. Background technique [0002] At present, the binders used in the production of iron-based mixed powder in the international and domestic powder metallurgy industries are generally vinyl polymers. These polymers are generally in the form of blocks or large particles. The above-mentioned polymers are obtained after dissolving in a certain proportion with a hydrocarbon solvent. Add the diluent of the polymer and other materials into the mixer in proportion. After mixing evenly, with the help of the strong volatility of the hydrocarbon solvent used, vacuumize the mixed material, and wait for the hydrocarbon After the substances are basically volatilized, the lubricant is added and mixed evenly, and the mixed material is sieved to obtain the iron-based mixed powder with the pred...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
Inventor 李建云罗霞光杜春峰武文健曾晖袁勇刘增林张炯
Owner LAIWU IRON & STEEL GRP
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