CN105369111A - Automobile connecting rod forged through abrasion-resistant corrosion-resistant iron-based powder in metallurgical manner and manufacturing method of automobile connecting rod - Google Patents

Abstract

The invention discloses an automobile connecting rod forged through abrasion-resistant corrosion-resistant iron-based powder in a metallurgical manner. The automobile connecting rod is composed of, by weight, 81 to 82 parts of iron powder, 5 to 5.8 parts of titanium powder, 2.3 to 2.6 parts of VC, 5.6 to 5.8 parts of MoC, 3.6 to 3.8 parts of phosphorized carbonyl iron powder, 0.3 to 0.4 part of zinc stearate, a proper amount of a silane coupling agent kh550, a proper amount of nanometer tungsten disulfide, a proper amount of polyethylene glycol and a proper amount of deionized water. By the adoption of the connecting rod, the nanometer tungsten disulfide is used in the water atomized powder manufacturing process, so that the dispersity and the lubricating performance of the powder are good, the use quantity of a lubricating agent is reduced, the density of a green blank is increased, pores of a finished product are small, the strength of alloy is greatly improved, and the forging pressure and the forging temperature are reduced. The titanium powder, the VC, the MoC, the phosphorized carbonyl iron powder and iron are used for forming a dense alloy structure, so that the connecting rod is excellent in abrasion resistance, tenacity, tensile strength and corrosion resistance.

Description

A kind of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar and preparation method thereof

Technical field

The present invention relates to powder metallurgical technology, particularly relate to a kind of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar and preparation method thereof.

Background technology

In the production of powdered metal parts how under production cost minimum as far as possible, reach as far as possible higher density, how to produce because aspect ratio high surface area is difficult to the complicated shape powdered metal parts of the demoulding, the intensity of green compact how just can be made higher, increase ability and the productivity of existing press, these are all badly in need of good lubricant.

Secondary compacting/double sintering (DP/DS) is all well-known with the technique of powder forging and so on, and this kind of technique can make the density of part reach 7.4 ~ 7.5gcm ^-3or close to theoretical density., the productive expense of these techniques is all very expensive.On the other hand, one time pressing one-time sintering is compared with secondary compacting double sintering, though significantly can reduce production cost, densification is subject to more restriction.For the cold compaction of the powder mix containing traditional lubrication agent (such as the mixture of wax, metallic stearate or two kinds of lubricants), general accessible green density is not higher than 7.2gcm ^-3.Density depends on the compressibility of original washing powder, the additive of interpolation and the quantity of lubricant, geometrical shape and the height of part, and the situation of compacting.

In order to strengthen densification by the method for once suppressing, in recent years, carried out various trial always.It is all two examples for increasing the pressing process that green density is developed that temperature and pressure and die wall lubrication are suppressed.Be 7.25 ~ 7.50gcm by these two kinds of accessible density ranges of technique ^-3.Temperature and pressure are made up of the powder powder mix suppressing preheating in the former of heating.The lubricant that temperature and pressure generally need use to design for it specially and binding agent.Particularly, organism must can bear the temperature (between general 130 ~ 150 DEG C) suffered when pre-heating powder and compacting.The lubricant that the densification of part is generally all subject to powder mix inside contains quantitative limitation.Die wall lubrication technology, owing to can reduce the amount of internal lubricant, just probably reaches high density.Before powder is loaded in former, a kind of exterior lubricant is sprayed on former wall, part can be made to be easy to compacting and to deviate from.These two kinds of methods of design are all the low cost process of alternative secondary compacting double sintering and powder forging.However, even there is a large amount of paper to confirm the potentiality of temperature and pressure and die wall lubrication greatly, but their purposes in powder metallurgy industry is still very limited.This is likely because in industry with under the condition of producing, they are much complicated than the pressing process of routine.

Although various lubricant solves certain part densification, the problem of the demoulding, the performance of part still can not be compared with casting, there is space many, and fragility is large, the problem that intensity is low, also needs to improve performance.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar, is made up of the raw material of following weight part: iron powder 81-82, titanium valve 5-5.8, VC2.3-2.6, MoC5.6-5.8, phosphate carbonyl iron powder 3.6-3.8, Zinic stearas 0.3-0.4, silane coupling agent kh550 is appropriate, nano tungsten disulfide is appropriate, polyoxyethylene glycol is appropriate, deionized water is appropriate.

The preparation method of described wear-resistant corrosion resistant iron base p/m forging automobile connecting bar, comprises the following steps:

(1) make water-atomized iron powder cooling fluid, polyoxyethylene glycol is added in deionized water by 0.3-0.4wt%, then adds 2-2.5wt% nano tungsten disulfide, stir, obtain cooling fluid;

(2) by iron powder, titanium valve mixing, add the 0.6-0.8wt% nano tungsten disulfide of mixture again, send into melt in furnace, then the aluminium alloy after fusing is continued to be heated to overheated 48-52 DEG C, then tundish is injected, carry out high-pressure atomization process again, spray in the cooling fluid that (1) step obtains, be stirred to the silane coupling agent kh550 that less than 60 DEG C add 0.8-0.9wt% again, stir, through precipitation, filter, dry, obtain powder;

(3) powder that (2) step obtains is mixed with other remaining components, carry out ball milling, shaping, compacting, sintering, finished machined, obtain blank;

(4) forged by blank, forging pressure is 558-560Mpa, and forging temperature is 1010-1020 DEG C, to obtain final product.

Advantage of the present invention is: the present invention is by using nano tungsten disulfide when making water atomized powder, make the good dispersity of powder, oilness good, decrease the consumption of lubricant, improve the density of green compact, and the space of finished product is few, substantially increase the intensity of alloy, reduce forging pressure and temperature, saved the energy, easy forging molding, after forging, toughness improves many, and release property is good.By using titanium valve, VC, MoC, phosphate carbonyl iron powder, defining fine and close alloy structure with iron, while making connecting rod have excellent wear resistance, there is excellent toughness, tensile strength and erosion resistance.

Embodiment

A kind of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar, is made up of the raw material of following weight part (kilogram): iron powder 81, titanium valve 5, VC2.3, MoC5.6, phosphate carbonyl iron powder 3.6, Zinic stearas 0.3, silane coupling agent kh550 is appropriate, nano tungsten disulfide is appropriate, polyoxyethylene glycol is appropriate, deionized water is appropriate.

The preparation method of described wear-resistant corrosion resistant iron base p/m forging automobile connecting bar, comprises the following steps:

(1) make water-atomized iron powder cooling fluid, polyoxyethylene glycol is added in deionized water by 0.3wt%, then adds 2wt% nano tungsten disulfide, stir, obtain cooling fluid;

(2) by iron powder, titanium valve mixing, add the 0.6wt% nano tungsten disulfide of mixture again, send into melt in furnace, then the aluminium alloy after fusing is continued to be heated to overheated 48 DEG C, then tundish is injected, carry out high-pressure atomization process again, spray in the cooling fluid that (1) step obtains, be stirred to the silane coupling agent kh550 that 60 DEG C add 0.8wt% again, stir, through precipitation, filter, dry, obtain powder;

(3) powder that (2) step obtains is mixed with other remaining components, carry out ball milling, shaping, compacting, sintering, finished machined, obtain blank;

(4) forged by blank, forging pressure is 558Mpa, and forging temperature is 1010 DEG C, to obtain final product.

Experimental data:

Make 10mm Cylinder sample, green density is 7.57g/cm after testing ³, slip ratio is 0.79, net pressure 51tsi, total pressure loss 11tsi, and slip shear-stress ratio is used alone Zinic stearas and reduces 48%, and illustrating property is good;

Sintered density is 99.6%, and tensile strength reaches 798MPa, and hardness reaches 106HRB, and ballistic work reaches 31J.

Claims (2)

1. a wear-resistant corrosion resistant iron base p/m forging automobile connecting bar, is characterized in that being made up of the raw material of following weight part: iron powder 81-82, titanium valve 5-5.8, VC2.3-2.6, MoC5.6-5.8, phosphate carbonyl iron powder 3.6-3.8, Zinic stearas 0.3-0.4, silane coupling agent kh550 is appropriate, nano tungsten disulfide is appropriate, polyoxyethylene glycol is appropriate, deionized water is appropriate.

2. the preparation method of wear-resistant corrosion resistant iron base p/m forging automobile connecting bar according to claim 1, is characterized in that comprising the following steps:

(1) make water-atomized iron powder cooling fluid, polyoxyethylene glycol is added in deionized water by 0.3-0.4wt%, then adds 2-2.5wt% nano tungsten disulfide, stir, obtain cooling fluid;

(2) by iron powder, titanium valve mixing, add the 0.6-0.8wt% nano tungsten disulfide of mixture again, send into melt in furnace, then the aluminium alloy after fusing is continued to be heated to overheated 48-52 DEG C, then tundish is injected, carry out high-pressure atomization process again, spray in the cooling fluid that (1) step obtains, be stirred to the silane coupling agent kh550 that less than 60 DEG C add 0.8-0.9wt% again, stir, through precipitation, filter, dry, obtain powder;

(3) powder that (2) step obtains is mixed with other remaining components, carry out ball milling, shaping, compacting, sintering, finished machined, obtain blank;

(4) forged by blank, forging pressure is 558-560Mpa, and forging temperature is 1010-1020 DEG C, to obtain final product.