CN104278174A - Zinc-base alloy material for engine cylinder piston and machining method thereof - Google Patents
Zinc-base alloy material for engine cylinder piston and machining method thereof Download PDFInfo
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- CN104278174A CN104278174A CN201310294635.2A CN201310294635A CN104278174A CN 104278174 A CN104278174 A CN 104278174A CN 201310294635 A CN201310294635 A CN 201310294635A CN 104278174 A CN104278174 A CN 104278174A
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Abstract
The invention discloses a zinc-base alloy material for an engine cylinder piston and a machining method thereof and belongs to the technical field of finish machining. Bump spots formed according to a certain rule and a certain pattern are formed on the transmission surface of a machine part to improve the lubricating condition and property of the machine part, so that the carrying capacity and service life of the machine part are enhanced. A Magnetic field electrolytic machining is adopted, and a diaphragm having micropores so as to selectively enable special ions bathed in electrolyte to permeate from one electrode to another electrode in an electrode reaction process is arranged between a positive electrode and a negative electrode; by the material and the machining method disclosed by the invention, the breakthrough from general machining to the finish machining is realized for solving the problems of high accuracy and difficult machining of parts with high strength and rigidity, high toughness and complex shapes especially, and moreover the machining accuracy is greatly enhanced.
Description
Technical field
The invention belongs to finishing technology field, relate to zinc base alloy, and engine cylinder piston.Especially a kind of Zn-Al-Cu-Mg-Si zinc base alloy is the engine cylinder piston processing method of material.
Background technology
Usually as the surfaces such as gear, bearing, piston, connecting rod normally adopt car, milling, grind, roll, insert, the method processing and manufacturing such as polishing.In order to the supporting capacity and work-ing life that improve part are lived toward the dimensional precision to these piece surfaces, surface smoothness proposes very high requirement, these requirements are not macroscopically because improve the lubricating condition of piece surface, thus make part not be that premature wear breaks exactly, can not meet in modern technologies mechanical component high-mechanic and long-life requirement, electrochemical machining is also referred to as electro-chemical machining, it is the contactless forming method of one based on electrochemical metal anode dissolution, efficiency is high, surface quality is good, negative electrode does not consume, be particularly suitable for processing intensity hardness high, toughness is large, complex-shaped part, critical role is occupied in modern manufacturing industry particularly national defense industry, but in electrochemical machining in the past, there is no barrier film between anodic-cathodic, electrolysis residue is made to be deposited in anode surface along the glide path of electrolytic solution, product is made easily to produce defect, when electrode by residue gradually covering electric current can be made sharply to decline, reduce electropolishing speed, therefore residue must be known, so must electrolysis be stopped, affect work, and residue affects strength of solution, constantly must add solution, the byproduct deposition of positive electrode is in negative electrode simultaneously, negative electrode forms an electrolytic coating, affect the electrochemical machining life-span.Dimensional precision and the form accuracy of current complex profile electrochemical machining can only reach 0.15-0.35mm, because flow liner exists after complex profile electrochemical machining, surfaceness is very poor, solves electrochemical machining precision and the problem of improving surfaceness is further the key that this technology of promotion further develops.
Summary of the invention
For the deficiencies in the prior art, the present invention in order to solve the problem, the engine cylinder piston processing method of the material that devises that to be a kind of Zn-Al-Cu-Mg-Si zinc base alloy be.
It is a kind of engine cylinder piston processing method that the present invention devises, material therefor Zn-Al-Cu-Mg-Si zinc base alloy, its percentage composition is: Al9.5%-10.4%, Cu7.2%-8.7%, Mg0.05%-0.09%, Si0.05%-0.07%, Fe<0.02, Pb<0.003, Cr<0.0025, all the other are zinc, preferred: Al9.8%-10.1%, Cu7.8%-8.1%, Mg0.06%-0.08%, Si0.055%-0.06%, Fe<0.02, Pb<0.003, Cr<0.0025, adopt the committed step of complete processing as follows: 1, (1) powder die forging duplex forging method forging engine cylinder piston is adopted, shielding gas is nitrogen, forging temperature is 820-880 DEG C, pressure is 720-840kN, (2) anneal is carried out, cylinder piston is put into high temperature frequency stove and be heated to 830-860 DEG C, insulation 3.5-4.5h, make part complete austenitizing and homogenizing, adopt air-cooled, (3) machining work is carried out to cylinder piston, face work, turning, milling edge.
Engine cylinder piston carries out precision work after machining, (1) to processing after cylinder piston on the surface by methods such as electronic scannings, piece surface is made to be formed with the projection spot formed with pattern arrangement according to certain rules, the area of projection spot is no less than the 45%-55% of this treatment of surfaces of components, (2) cylinder piston after electronic scanning carries out resultant field electrolysis precision work, electrode speed of feed 0.5-0.9mm/min, machining voltage is 25-28V, the NaOH aqueous solution of electrolytic solution to be mass concentration be 12-14%, the temperature of electrolytic solution is 22-27 DEG C, the hydraulic pressure of electrolytic solution is 4.8-8.5Mpa, the electric current of electrolytic solution is 600-800A, anode connects cylinder piston, negative electrode is tool-electrode, between two-stage, gap is 0.1-0.8mm, along with the continuous dissolving of workpiece surface gold cellulosic material, workpiece surface is processed to the profile close to tool-electrode gradually, required profile is obtained until tool-electrode profile duplicated on cylinder piston.By magnet arrangements between negative and positive level, electrochemical machining flow field is improved, improves the precision of electrochemical machining.
Carry out Quench and temper process after precision work, be incubated 1-2h and cool fast in profit after being heated 850-870 DEG C, carry out low-temperaturetempering immediately, tempering temperature is 160-240 DEG C.
The invention has the advantages that micro-precision work of machinery part surface, belong to precision work in mechanical workout, the projection spot that object is that mechanical component pulled surface is formed with and forms with certain figure according to certain rules to improve lubricating condition and the performance of part, thus increases supporting capacity and the work-ing life of part.The magnetic field electrochemical machining adopted, has installed and has had micropore to make bath solution specific ion in the electrolytic solution selectively from an electrode infiltration to the barrier film of another electrode in electrode process between positive electrode and negative electrode.Thus prevent metallic residue to arrive negative electrode formation electrolytic coating, and prevent the change of strength of solution, there is arrangement of magnets between negative and positive level simultaneously in the shut-down avoiding plating, the flow field of electrochemical machining is improved, effectively improves the precision of electrochemical machining.Especially high to intensity hardness, toughness is large, the high precision of complex shape part and difficult processing problems, achieves from being generally worked into precision machined breakthrough, working accuracy is improved greatly.
Embodiment
Embodiment one
A kind of engine cylinder piston processing method, material therefor Zn-Al-Cu-Mg-Si zinc base alloy, its percentage composition is: Al9.5%, Cu7.2%, Mg0.05%, Si0.05%, Fe<0.02, Pb<0.003, Cr<0.0025, all the other are zinc, adopt the committed step of complete processing as follows: (1) adopts powder die forging duplex forging method forging engine cylinder piston, shielding gas is nitrogen, forging temperature is 820 DEG C, pressure is 720kN, (2) anneal is carried out, cylinder piston is put into high temperature frequency stove and be heated to 830 DEG C, insulation 4.5h, make part complete austenitizing and homogenizing, adopt air-cooled, (3) machining work is carried out to cylinder piston, face work, turning, milling edge.(4) with electronics, cat is swept on the surface to the cylinder piston after processing, piece surface is made to be formed with the projection spot formed with pattern arrangement according to certain rules, the area of projection spot is no less than 45%% of this treatment of surfaces of components, (5) cylinder piston after electronic scanning carries out resultant field electrolysis precision work, electrode speed of feed 0.5mm/min, machining voltage is 25V, electrolytic solution to be mass concentration be 12% the NaOH aqueous solution, the temperature of electrolytic solution is 22 DEG C, the hydraulic pressure of electrolytic solution is 4.8Mpa, the electric current of electrolytic solution is 600A, anode connects cylinder piston, negative electrode is tool-electrode, between two-stage, gap is 0.1mm, along with the continuous dissolving of workpiece surface gold cellulosic material, workpiece surface is processed to the profile close to tool-electrode gradually, required profile is obtained until tool-electrode profile duplicated on cylinder piston.By magnet arrangements between negative and positive level, electrochemical machining flow field is improved, improves the precision of electrochemical machining, (6) Quench and temper process is carried out, be incubated 1h after it is characterized in that being heated 850 DEG C to cool fast in profit, carry out low-temperaturetempering immediately, tempering temperature is 160 DEG C.
Embodiment two
A kind of engine cylinder piston processing method, material therefor Zn-Al-Cu-Mg-Si zinc base alloy, its percentage composition is: Al10.4%, Cu7.2%, Mg0.05%, Si0.05%, Fe0.01, Pb<0.003, Cr<0.0025, all the other are zinc, adopt the committed step of complete processing as follows: (1) adopts powder die forging duplex forging method forging engine cylinder piston, shielding gas is nitrogen, forging temperature is 820 DEG C, pressure is 720kN, (2) anneal is carried out, cylinder piston is put into high temperature frequency stove and be heated to 830 DEG C, insulation 4.5h, make part complete austenitizing and homogenizing, adopt air-cooled, (3) machining work is carried out to cylinder piston, face work, turning, milling edge.(4) with electronics, cat is swept on the surface to the cylinder piston after processing, piece surface is made to be formed with the projection spot formed with pattern arrangement according to certain rules, the area of projection spot is no less than 45%% of this treatment of surfaces of components, (5) cylinder piston after electronic scanning carries out resultant field electrolysis precision work, electrode speed of feed 0.5mm/min, machining voltage is 25V, electrolytic solution to be mass concentration be 12% the NaOH aqueous solution, the temperature of electrolytic solution is 22 DEG C, the hydraulic pressure of electrolytic solution is 4.8Mpa, the electric current of electrolytic solution is 600A, anode connects cylinder piston, negative electrode is tool-electrode, between two-stage, gap is 0.1mm, along with the continuous dissolving of workpiece surface gold cellulosic material, workpiece surface is processed to the profile close to tool-electrode gradually, required profile is obtained until tool-electrode profile duplicated on cylinder piston.By magnet arrangements between negative and positive level, electrochemical machining flow field is improved, improves the precision of electrochemical machining, (6) Quench and temper process is carried out, be incubated 1h after it is characterized in that being heated 850 DEG C to cool fast in profit, carry out low-temperaturetempering immediately, tempering temperature is 160 DEG C.
Embodiment three
A kind of engine cylinder piston processing method, material therefor Zn-Al-Cu-Mg-Si zinc base alloy, its percentage composition is: Al9.5%, Cu8.7%, Mg0.05%, Si0.05%, Fe<0.02, Pb<0.003, Cr<0.0025, all the other are zinc, adopt the committed step of complete processing as follows: (1) adopts powder die forging duplex forging method forging engine cylinder piston, shielding gas is nitrogen, forging temperature is 820 DEG C, pressure is 720kN, (2) anneal is carried out, cylinder piston is put into high temperature frequency stove and be heated to 830 DEG C, insulation 4.5h, make part complete austenitizing and homogenizing, adopt air-cooled, (3) machining work is carried out to cylinder piston, face work, turning, milling edge.(4) with electronics, cat is swept on the surface to the cylinder piston after processing, piece surface is made to be formed with the projection spot formed with pattern arrangement according to certain rules, the area of projection spot is no less than 45%% of this treatment of surfaces of components, (5) cylinder piston after electronic scanning carries out resultant field electrolysis precision work, electrode speed of feed 0.5mm/min, machining voltage is 25V, electrolytic solution to be mass concentration be 12% the NaOH aqueous solution, the temperature of electrolytic solution is 22 DEG C, the hydraulic pressure of electrolytic solution is 4.8Mpa, the electric current of electrolytic solution is 600A, anode connects cylinder piston, negative electrode is tool-electrode, between two-stage, gap is 0.1mm, along with the continuous dissolving of workpiece surface gold cellulosic material, workpiece surface is processed to the profile close to tool-electrode gradually, required profile is obtained until tool-electrode profile duplicated on cylinder piston.By magnet arrangements between negative and positive level, electrochemical machining flow field is improved, improves the precision of electrochemical machining, (6) Quench and temper process is carried out, be incubated 1h after it is characterized in that being heated 850 DEG C to cool fast in profit, carry out low-temperaturetempering immediately, tempering temperature is 160 DEG C.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (5)
1. an engine cylinder piston zinc base alloy, it is characterized in that the degree including following elements: Al9.5%-10.4%, Cu7.2%-8.7%, Mg0.05%-0.09%, Si0.05%-0.07%, Fe<0.02, Pb<0.003, Cr<0.0025, all the other are zinc.
2. the engine cylinder piston zinc base alloy according to claims 1, it is characterized in that: Al9.8%-10.1%, Cu7.8%-8.1%, Mg0.06%-0.08%, Si0.055%-0.06%, Fe<0.02, Pb<0.003, Cr<0.0025, all the other are zinc.
3. a kind of zinc base alloy of employing described in claims 1 or 2 is the engine cylinder piston processing method of material; it is characterized in that: (1) adopts powder die forging duplex forging method forging engine cylinder piston; shielding gas is nitrogen; forging temperature is 820-880 DEG C; pressure is 720-840kN; (2) anneal is carried out; cylinder piston is put into high temperature frequency stove and be heated to 830-860 DEG C; insulation 3.5-4.5h, makes part complete austenitizing and homogenizing, adopts air-cooled; (3) machining work is carried out to cylinder piston; face work, turning, milling edge.
4. method according to claim 3, engine cylinder piston carries out precision work after machining, it is characterized in that: (1) to processing after cylinder piston on the surface by methods such as electronic scannings, piece surface is made to be formed with the projection spot formed with pattern arrangement according to certain rules, the area of projection spot is no less than the 45%-55% of this treatment of surfaces of components, (2) cylinder piston after electronic scanning carries out resultant field electrolysis precision work, electrode speed of feed 0.5-0.9mm/min, machining voltage is 25-28V, the NaOH aqueous solution of electrolytic solution to be mass concentration be 12-14%, the temperature of electrolytic solution is 22-27 DEG C, the hydraulic pressure of electrolytic solution is 4.8-8.5Mpa, the electric current of electrolytic solution is 600-800A, anode connects cylinder piston, negative electrode is tool-electrode, between two-stage, gap is 0.1-0.8mm, along with the continuous dissolving of workpiece surface gold cellulosic material, workpiece surface is processed to the profile close to tool-electrode gradually, required profile is obtained until tool-electrode profile duplicated on cylinder piston.By magnet arrangements between negative and positive level, electrochemical machining flow field is improved, improves the precision of electrochemical machining.
5. method according to claim 4, engine cylinder piston carries out Quench and temper process after precision work, be incubated 1-2h after it is characterized in that being heated 850-870 DEG C to cool fast in profit, carry out low-temperaturetempering immediately, tempering temperature is 160-240 DEG C.
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| CN201310294635.2A CN104278174A (en) | 2013-07-12 | 2013-07-12 | Zinc-base alloy material for engine cylinder piston and machining method thereof |
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| CN201310294635.2A CN104278174A (en) | 2013-07-12 | 2013-07-12 | Zinc-base alloy material for engine cylinder piston and machining method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057997A (en) * | 2015-08-07 | 2015-11-18 | 无锡桥阳机械制造有限公司 | Camshaft machining and manufacturing process adopting Zn-Al-Ti-Mg series alloy steel as material |
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2013
- 2013-07-12 CN CN201310294635.2A patent/CN104278174A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057997A (en) * | 2015-08-07 | 2015-11-18 | 无锡桥阳机械制造有限公司 | Camshaft machining and manufacturing process adopting Zn-Al-Ti-Mg series alloy steel as material |
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Application publication date: 20150114 |