CN106392493A

CN106392493A - Manufacturing technology for motorcycle engine cylinder sleeve

Info

Publication number: CN106392493A
Application number: CN201611037018.4A
Authority: CN
Inventors: 刘洋
Original assignee: Chongqing Sailing Motorcycle Manufacturing Co Ltd
Current assignee: Chongqing Sailing Motorcycle Manufacturing Co Ltd
Priority date: 2016-11-23
Filing date: 2016-11-23
Publication date: 2017-02-15

Abstract

The invention relates to a manufacturing technology for a motorcycle engine cylinder sleeve. According to the technology, the motorcycle engine cylinder sleeve is required to be good in heat transmission and heat dissipation and have a wear-resistant inner surface. According to the technology, metallurgical bonding is achieved through high-temperature diffusion between a grey cast iron inner cylinder sleeve and an aluminum or aluminum alloy outer cylinder sleeve, laser hardening treatment of the inner surface of the inner cylinder sleeve has a good effect, the hardness of the inner surface can reach HRC 55 or above, the wear resistance is improved, precision is improved, the service life is prolonged, and meanwhile the heat conduction and heat dissipation effects are greatly improved.

Description

Cylinder jacket of motorcycle engine manufacturing process

The present invention relates to cylinder jacket of motorcycle engine manufacturing process.

The running quality of motorcycle is heavily dependent on the wind-cooling heat dissipating effect of electromotor and wear resistance to essence Spend the impact in life-span, in order to improve engine radiating effect and wear resistance, for a long time, cylinder sleeve of engine manufacture method is Such, selection has certain elevated temperature strength, low-cost grey cast-iron does inner sleeve, using the aluminum with Thermal conductivity Or metal casts air-cooled overcoat, after being machined to predetermined size, air-cooled aluminum overcoat is heated, the reaming due to thermal expansion, then Load cast iron inner sleeve, cool down after-contraction, be allowed to be fitted close and form entirety, in addition, in order to increase the contact between inner-outer sleeve Face, expands area of dissipation, the contact surface between inner-outer sleeve is processed into flute profile.But, the motorcycle that this method is produced is sent out There is obvious shortcoming in motivation cylinder sleeve：

1., although being to combine closely between aluminum overcoat and cast iron inner sleeve, it is mechanical bond after all, connecing between inner-outer sleeve Gap, oxide-film, rust staining etc. are unavoidably existed on contacting surface, larger thermal resistance can be caused, have a strong impact on heat-conducting effect, final shadow Ring the heat sinking function of motorcycle engine；

2. still ratio is relatively low for grey cast-iron inner cylinder liner, mechanical strength and hardness, is easily worn and torn by piston ring, thus affecting Cylinder sleeve of engine accuracy life；

Disadvantages mentioned above for the effective power improving motorcycle engine, fire by road speed ability and accuracy life and reduction Consumption is all unfavorable.

The purpose of the present invention is that, for the shortcoming of above-mentioned prior art, provides a kind of cylinder jacket of motorcycle engine new Technique.

In order to realize the purpose of the invention described above, the motor cycle cylinder sleeve of engine manufacturing process providing includes following step Suddenly：

1. prepare grey cast-iron inner cylinder liner ironcasting blank, and strictly clear up its outer surface；

2. the inner casing of surface cleaning is placed in mould, aluminum or aluminum alloy molten mass of casting, insulation, slowly cold therewith But, make cylinder sleeve；

3. pair inboard wall of cylinder liner carries out laser transformation hardening process；

Preparing the method for inner cylinder liner ironcasting blank and prior art in wherein the 1st step is identical, simply outer surface Cleaning require higher, the such as outer garden of turning, make outer surface appear bright and clean pure Cast Iron Surface, and reach predetermined size；2nd, the 3rd Step then belongs to the main points of the present invention, and in the 2nd step, the aluminum or aluminum alloy temperature of melting used can be 550 DEG C -680 DEG C, is cast to First equipped with inner cylinder liner ground mould, it is incubated, then slow cooling, so that the aluminum-ferrum at interface is diffused into one another, to form aluminum-iron alloy diffusion Layer, that is, form so-called metallurgical binding, so can substantially reduce thermal resistance, increases thermal conductivity, improves the heat conduction and heat radiation effect of electromotor； It is that inner surface of cylinder liner is carried out with laser transformation hardening process in 3rd step, concrete grammar is to can be selected for CO₂Laser instrument, power is 700-1500 watt, spot diameter is 2.5-6 millimeter, is scanned treatment with irradiation, and processing area can be the 50-80% of the gross area, After so processing, the depth of hardened layer is 0.25-0.60 millimeter, surface hardness can by the Hv250 of before processing about improve everywhere Hv850 after reason about, be equivalent to more than HRc55, so will greatly improve inner cylinder liner antiwear property, thus greatly improve sending out The accuracy life of motivation.

Below, introduce one embodiment of the present of invention：

F125 motorcycle engine wind cooling cylinder sleeve, is such manufacture according to the present invention：Outsourcing inner cylinder liner grey casting, Its outer garden of turning, makes the pure Cast Iron Surface that surface open is bright and clean, and reaches predetermined size；Then by the inner casing of above-mentioned any surface finish Set, is placed in mould by dimensional requirement, mould is used to cast aluminum alloys outer cylinder sheath, or alternatively above-mentioned inner cylinder liner Become a part for mould, the aluminium alloy of melting (700 DEG C) is cast to above-mentioned mould it is clear that molten aluminium alloy and inner sleeve Bright and clean outer surface is fully contacted, and then, is incubated 30 minutes, makes inner-outer sleeve interface form aluminum-ferrum diffusion layer, reaches metallurgical binding, Subsequently boring mill is carried out to the inner surface of cylinder sleeve, and reach predetermined size；Laser transformation is carried out again to the inboard wall of cylinder liner after boring mill hard Change is processed, from the continuous CO of transverse flow discharge₂Laser instrument, power elects 900W as, and spot diameter is 4 millimeters, scanning speed 3.5 Mm/second, obtains screw-type decorative pattern, and processing area is the 75% of the gross area, and after treatment, hardness reaches HRc55；Swash through above-mentioned The cylinder sleeve bore that photo-hardening is processed carries out right boring processing again, reaches predetermined size and precision, you can use.

Claims

1. cylinder jacket of motorcycle engine manufacturing process is it is characterised in that this manufacture method comprises the following steps：

(1), manufacture grey cast-iron inner cylinder liner ironcasting blank；And strictly clear up its outer surface；

(2), the inner casing of surface cleaning is placed in mould, aluminum or aluminum alloy molten mass of casting, insulation, Slow cooling therewith, Make cylinder sleeve；

(3), laser transformation hardening process is carried out to inboard wall of cylinder liner.

2. cylinder jacket of motorcycle engine manufacturing process according to claim 1 is it is characterised in that in described (2nd) step Aluminum or aluminum alloy temperature is 550 DEG C -680 DEG C；(3rd) described step laser transformation hardening is processed, from CO₂Laser instrument, power For 700-1000W, spot diameter is 2.5-6 millimeter, and processing area is the 50-80% of the gross area.