CN103394687B

CN103394687B - A kind of one-part form dry mixing methods of P/m Iron Base mixed powder

Info

Publication number: CN103394687B
Application number: CN201310317465.5A
Authority: CN
Inventors: 李建云; 杜春峰; 曾晖; 王金洪; 罗霞光; 袁勇; 刘增林; 张毅
Original assignee: Laiwu Iron and Steel Group Co Ltd
Current assignee: Laiwu Iron and Steel Group Co Ltd
Priority date: 2013-07-25
Filing date: 2013-07-25
Publication date: 2015-12-02
Anticipated expiration: 2033-07-25
Also published as: CN103394687A

Abstract

The invention discloses a kind of one-part form dry mixing methods of P/m Iron Base mixed powder, described method comprises the steps: 1) in proportion iron powder, alloyed powder, graphite powder and binding agent are joined in blender, normal temperature mixing 10 ~ 20min; 2) mixture temperature is risen to 140 DEG C ~ 160 DEG C, mixing 2 ~ 10min; 3) again mixture temperature is brought down below the melting temperature of lubricant, adds lubricant, mixing 10 ~ 15min; 4) compound is poured out middle roll-over from blender, screening, packaging, obtain iron base powder mixture.The method has reasonable in design, eco-friendly characteristic, after actual production, binding agent adopts direct feed postition, eliminate the use of varsol in original method, avoid because varsol volatilizees the environmental pollution that causes and personnel's injury, avoid binding agent dilution etching apparatus rubber component and blocking liquid-transport pipe-line problem.

Description

A kind of one-part form dry mixing methods of P/m Iron Base mixed powder

Technical field

The invention belongs to Powder Metallurgy Industry technical field, be specifically related to a kind of one-part form dry mixing methods of P/m Iron Base mixed powder.

Background technology

The current world, the binding agent that domestic Powder Metallurgy Industry produces iron base powder mixture used is generally polyvinyls, this base polymer is generally in block or large grained, the dilution of above-mentioned polymer is obtained after dissolving by a certain percentage with varsol, by the dilution of polymer and other material in proportion together with join in blender, after mixing, by the strong boiling characteristics of varsol used, process is vacuumized to mixed material, after treating that hydrocarbons volatilizees substantially, add mix lubricant more even, compound goes out the iron base powder mixture that machine obtains predetermined composition after screening.Adopt said method to produce the main Problems existing of iron base powder mixture to have: 1, the general all irritant smell of varsol used, and harmful.2, the volatile matter of varsol is arranged outward, pollutes production environment.3, the dilution of polymer still has good colloidal sol effect, relevant rubber components on easy etching apparatus.4, the dilution of polymer becomes solid gum after doing, and easily blocks liquid-transport pipe-line.Therefore, the production method proposing a kind of more superior P/m Iron Base mixed powder is needed.

Summary of the invention

The object of the invention is to, provide a kind of one-part form dry mixing methods of P/m Iron Base mixed powder, the binding agent of the method adopts the mode directly added, and eliminates the use of varsol, has reasonable in design, eco-friendly advantage.

For achieving the above object, present invention employs following technical scheme:

A kind of P/m Iron Base mixed powder one-part form dry mixing methods, described method comprises the steps:

1) in proportion iron powder, alloyed powder, graphite powder and binding agent are joined in blender, normal temperature mixing 10 ~ 20min;

2) mixture temperature is risen to 140 DEG C ~ 160 DEG C, mixing 2 ~ 10min;

3) again mixture temperature is brought down below the melting temperature of lubricant, adds lubricant, mixing 10 ~ 15min;

4) compound is poured out middle roll-over from blender, screening, packaging, obtain iron base powder mixture.

Polyvinyls selected by binding agent wherein described in step 1, this polyvinyls granularity be 74 ~ 250 μm (granularity of binding agent can more tiny better), fusing point 130 DEG C ~ 150 DEG C.

Blender described in step 1) is special, except batch mixing, also has the function of heating, cooling.

In step 1), each material is normal temperature mixing 10min ~ 20min in blender, and each material substantially mixes.

Step 2) in, be reduce duration of runs of blender, can heat up experience according to blender, open heating schedule in advance, as long as the material met in blender can mix 10min ~ 20min before being warming up to 130 DEG C.

Step 2) in, the compound mixing 2min ~ 10min of 140 DEG C ~ 160 DEG C, binding agent in compound melts completely, thus (in contrast ferrous powder granules is comparatively large, and the particle of alloy powder, graphite powder is tiny to realize alloy powder, graphite powder to be bonded to the object on ferrous powder granules surface; Binding agent with addition of amount be generally 0.2% ~ 0.5% of total amount, material do not stop mix situation under, large-scale consolidation can not be formed).

Wherein in step 3), lubricant because of kind selected by customer requirement difference different, its fusing point is also different, for preventing lubricant from losing lubrication because of fusing, therefore the temperature of compound will be cooled to below lubricant melting temperature.

Wherein in step 4), oversize is discarded object, and screenings is required iron base powder mixture finished product.

Preferably implement according to one of the present invention, described alloyed powder is copper powder and nickel powder, the addition of described copper powder is 2% of raw material total amount, the addition of described nickel powder is 1%, described lubricant is zinc stearate, the addition of described zinc stearate is 0.6% of raw material total amount, and the addition of described graphite powder is 0.5% of raw material total amount.

The one-part form dry mixing methods of P/m Iron Base mixed powder provided by the invention has the characteristics such as reasonable in design, environmental friendliness, after the method is used for the production of P/m Iron Base mixed powder, binding agent adopts the mode directly added, eliminate the use of varsol, thus avoid the environmental pollution and personnel's injury that the volatilization because of varsol causes, avoid the problem of binding agent dilution etching apparatus rubber component and blocking liquid-transport pipe-line.

Accompanying drawing explanation

Fig. 1 is method flow diagram of the present invention.

Detailed description of the invention

With the drawings and specific embodiments, the present invention is further detailed explanation below.

Embodiment 1

As shown in Figure 1, by percentage to the quality, produce the iron base powder mixture that composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate, the polyvinyls of 74 ~ 250 μm is content of binder is 0.3%.Load weighted iron powder, copper powder, nickel powder, graphite powder, binding agent powder are joined in blender and mix 15min; Start blender heating schedule, after mixed powder temperature to 140 in blender DEG C, continue mixing 5min; Close heating schedule, open cooling program, after mixed powder temperature is down to 110 DEG C in blender, opens blender charging aperture, add zinc stearate, close charging aperture, mixing 12min; Close blender cooling program and batch mixing program, open feed opening, put by material in blender to middle roll-over, the compound in centering roll-over carries out sieving, packing, and obtains qualified iron base powder mixture.

Embodiment 2

As shown in Figure 1, by percentage to the quality, produce the iron base powder mixture that composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate, the polyvinyls of 74 ~ 250 μm is content of binder is 0.2%.Load weighted iron powder, copper powder, nickel powder, graphite powder, binding agent powder are joined in blender and mix 10min; Start blender heating schedule, after mixed powder temperature to 160 in blender DEG C, continue mixing 2min; Close heating schedule, open cooling program, after mixed powder temperature is down to 110 DEG C in blender, opens blender charging aperture, add zinc stearate, close charging aperture, mixing 10min; Close blender cooling program and batch mixing program, open feed opening, put by material in blender to middle roll-over, the compound in centering roll-over carries out sieving, packing, and obtains qualified iron base powder mixture.

Embodiment 3

As shown in Figure 1, by percentage to the quality, produce the iron base powder mixture that composition is Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate, the polyvinyls of 74 ~ 250 μm is content of binder is 0.5%.Load weighted iron powder, copper powder, nickel powder, graphite powder, binding agent powder are joined in blender and mix 20min; Start blender heating schedule, after mixed powder temperature to 150 in blender DEG C, continue mixing 10min; Close heating schedule, open cooling program, after mixed powder temperature is down to 110 DEG C in blender, opens blender charging aperture, add zinc stearate, close charging aperture, mixing 15min; Close blender cooling program and batch mixing program, open feed opening, put by material in blender to middle roll-over, the compound in centering roll-over carries out sieving, packing, and obtains qualified iron base powder mixture.

Claims

1. an one-part form dry mixing methods for P/m Iron Base mixed powder, described method comprises the steps:

2) mixture temperature is risen to 140 DEG C ~ 160 DEG C, mixing 2 ~ 10min;

4) compound is poured out middle roll-over from blender, screening, packaging, obtain iron base powder mixture;

Described binding agent directly adds, and omits the use of varsol;

The addition of described binding agent is 0.2 ~ 0.5% of raw material total amount;

Described alloyed powder is copper powder and nickel powder, and the addition of described copper powder is 2% of raw material total amount, and the addition of described nickel powder is 1% of raw material total amount;

Described lubricant is zinc stearate, and the addition of described zinc stearate is 0.6% of raw material total amount;

The addition of described graphite powder is 0.5% of raw material total amount;

Described iron base powder mixture is: by percentage to the quality, and composition is the iron base powder mixture of Fe-2%Cu-1%Ni-0.5%C-0.6% zinc stearate.

2. the one-part form dry mixing methods of P/m Iron Base mixed powder according to claim 1, is characterized in that, described binding agent is polyvinyls, and the granularity of described polyvinyls is 74 ~ 250 μm, and fusing point is 130 DEG C ~ 150 DEG C.