CN100445426C

CN100445426C - Method for squeezing silicon carbide into inside chrome coating of cylinder liner

Info

Publication number: CN100445426C
Application number: CNB2004100237475A
Authority: CN
Inventors: 艾爽; 唐宁; 赵良学; 李显昌; 姜书博
Original assignee: YANTAI WANSITE CO Ltd
Current assignee: YANTAI WANSITE CO Ltd
Priority date: 2004-03-18
Filing date: 2004-03-18
Publication date: 2008-12-24
Anticipated expiration: 2024-03-18
Also published as: CN1563492A

Abstract

The present invention discloses a method for squeezing silicon carbide into a chrome coating of a cylinder liner. In the method, a cylinder liner with a chrome coating oil storage structure is fixed on a honing machine, and silicon carbide mixed by taking mineral oil as a carrier; silicon carbide microparticles are uniformly squeezed into holes of the chrome coating oil storage structure of the cylinder liner. The surface of a chrome coating is polished, and the Tp value of the surface can reach the requirements matched with operation. The surface and the inside of the chrome coating of the cylinder liner processed by the method of the present invention both have silicon carbide by X-ray diffraction. The present invention has the characteristics that the inside of the chrome coating is provided with uniformly distributed silicon carbide microparticles, and the service life of the cylinder liner is extended; along with the abrasion of the chrome coating, silicon carbide can synchronously sink to enable the content of the silicon carbide in the chrome coating to be improved, so the abrasion resistance of the cylinder liner can be better and better.

Description

A kind of method from silicon carbide to cylinder sleeve chromium layer inside that clamp-on

One, technical field

The invention belongs to the cylinder sleeve of engine processing technique field, especially relate to a kind of method from silicon carbide to cylinder sleeve chromium layer inside that clamp-on.

Two, background technology

For increasing the wear resistance of engine jacket chromium coating, existing cylinder sleeve complete processing is at first by the control electroplating technological parameter, mainly be bath temperature and current density, chromic anhydride and sulfuric acid concentration ratio hard chrome plating, acquisition has the hard chromium of tiny crack, utilize acid or alkaline anodizing, further obtain porosity crackle (spongy chromium plating layer), increase can store the surface structure of lubricating oil, avoid producing the wearing and tearing under the unlubricated friction situation between cylinder sleeve and piston ring or utilizing the way of mechanical scratching to obtain the rough user mode of chromium laminar surface, increase the store oil chance, reduce the unlubricated friction between basic friction member and spouse's friction member, improve the wear resistance of engine jacket chromium coating, adopt existing complete processing because reticulate pattern is less more shallow, the store oil lubricant effect of chromium coating is bad, and engine jacket is short work-ing life.

Three, summary of the invention

The objective of the invention is to improve the deficiency of prior art and provide prolong the work-ing life of silicon-carbide particles that equally distributed ultrahard is arranged in a kind of chromium layer, engine jacket, improve along with the wearing and tearing silicon carbide of chromium layer can sink to making carborundum content in the chromium layer synchronously in the use, the engine jacket wear resistance is become better and better clamp-ons the method for silicon carbide to the spongy chromium layer of cylinder sleeve inside.

The object of the present invention is achieved like this, a kind ofly clamp-ons the method for silicon carbide to cylinder sleeve chromium layer inside, is characterized in that this method may further comprise the steps:

A, the cylinder sleeve that has chromium layer store oil structure after will electroplating are fixed on the honing machine;

B, be that the requirement that carrier uses by difference mixes the black or green silicon carbide with 180-320 order granularity with mineral oil, under 20～25 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of cylinder sleeve chromium layer store oil structure with honing machine;

C, make cylinder iron that bar polishes the chromium laminar surface simultaneously, make surperficial Tp value reach the requirement of cylinder sleeve of engine and piston ring work coupling.

In order further to realize purpose of the present invention, can also be that the store oil structure of the chromium layer of cylinder sleeve after electroplating is spongy.

Compared with the prior art the present invention has following distinguishing feature and positively effect: the present invention adopts and will electroplate the cylinder sleeve that obtains spongy store oil structure by the electroplating current waveform, with mineral oil is that carrier mixes with different grain size, the silicon carbide of model, under 20～25 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of spongy store oil structure with honing machine, carborundum content can reach 5%～8%, and utilize the cast iron bar that the chromium laminar surface is polished, make surperficial Tp value reach the requirement of cylinder sleeve of engine and piston ring work coupling, by the cylinder sleeve after the inventive method processing, use X-ray diffraction chromium laminar surface and inside all to have silicon carbide to exist, because the silicon-carbide particles of equally distributed ultrahard are arranged in the chromium layer, this makes prolong greatly the work-ing life of engine jacket, and in use, wearing and tearing along with the chromium layer, silicon carbide can sink to making the carborundum content in the chromium layer to improve synchronously, the engine jacket wear resistance is become better and better, use the engine jacket store oil of this processes effective, use properties is stable, wear resistance is good, match grinding is good, oil consumption is few, the engine output height, exhaust emissions property up to standard is good, and improve a lot than traditional technology work-ing life.

Four, specific embodiments

Embodiment 1, a kind of method from silicon carbide to the spongy chromium layer of cylinder sleeve inside that clamp-on, be that cylinder sleeve passes through to electroplate processing, make the cylinder sleeve surface obtain the store oil structure, with mineral oil is that carrier mixes the black or green silicon carbide with 180-320 order granularity, with honing machine under 20～25 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of spongy store oil structure, make carborundum content reach 5%～8%, cylinder iron bar polishes the chromium laminar surface simultaneously, the requirement that makes surperficial Tp value reach cylinder sleeve of engine and piston ring work coupling gets final product, adopt the cylinder sleeve after the inventive method is processed, use X-ray diffraction chromium laminar surface and inside all to have silicon carbide to exist.

Embodiment 2, a kind of method from silicon carbide to the spongy chromium layer of cylinder sleeve inside that clamp-on, be that cylinder sleeve passes through to electroplate processing, make the cylinder sleeve surface obtain spongy store oil structure, with mineral oil is that carrier mixes the black or green silicon carbide with 180-320 order granularity, with honing machine under 20 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of spongy store oil structure, make carborundum content reach 5%～8%, cylinder iron bar polishes the chromium laminar surface simultaneously, the requirement that makes cylinder sleeve surface Tp value reach cylinder sleeve of engine and piston ring work coupling gets final product, adopt the cylinder sleeve after the inventive method is processed, use X-ray diffraction chromium laminar surface and inside all to have silicon carbide to exist.

Embodiment 3, a kind of method from silicon carbide to the spongy chromium layer of cylinder sleeve inside that clamp-on, be that cylinder sleeve passes through to electroplate processing, make the cylinder sleeve surface obtain spongy store oil structure, with mineral oil is that carrier mixes the black or green silicon carbide with 180-320 order granularity, with honing machine under 25 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of spongy store oil structure, make carborundum content reach 5%～8%, cylinder iron bar polishes the chromium laminar surface simultaneously, the requirement that makes cylinder sleeve surface Tp value reach cylinder sleeve of engine and piston ring work coupling gets final product, adopt the cylinder sleeve after the inventive method is processed, use X-ray diffraction chromium laminar surface and inside all to have silicon carbide to exist.

Adopt the cylinder sleeve of the inventive method processing, use X-ray diffraction chromium laminar surface and inside to have silicon carbide to exist, because the silicon-carbide particles of equally distributed ultrahard are arranged in the chromium layer, this makes prolong greatly the work-ing life of engine jacket, and in use, wearing and tearing along with the chromium layer, silicon carbide can sink to making the carborundum content in the chromium layer to improve synchronously, and the engine jacket wear resistance is become better and better, and uses the engine jacket store oil of this processes effective, use properties is stable, wear resistance is good, match grinding is good, and oil consumption is few, the engine output height, exhaust emissions property up to standard is good, and improve a lot than traditional technology work-ing life.

Claims

1, a kind ofly clamp-on the method for silicon carbide, it is characterized in that this method may further comprise the steps to cylinder sleeve chromium layer inside:

B, be that the requirement that carrier uses by difference mixes the black or green silicon-carbide particles with 180-320 order granularity with mineral oil, under 20 pressure more than the standard atmospheric pressure, utilize the cast iron bar silicon-carbide particles to be clamp-oned equably the hole of cylinder sleeve chromium layer store oil structure with honing machine;

2, according to claim 1ly a kind ofly clamp-on the method for silicon carbide to cylinder sleeve chromium layer inside, the store oil structure that it is characterized in that electroplating the chromium layer of back cylinder sleeve is spongy.