CN104128682A - Method for grinding and finishing surface of cam of internal combustion engine camshaft through electrochemical composite abrasive belt with reverse pulses - Google Patents
Method for grinding and finishing surface of cam of internal combustion engine camshaft through electrochemical composite abrasive belt with reverse pulses Download PDFInfo
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- CN104128682A CN104128682A CN201410345082.3A CN201410345082A CN104128682A CN 104128682 A CN104128682 A CN 104128682A CN 201410345082 A CN201410345082 A CN 201410345082A CN 104128682 A CN104128682 A CN 104128682A
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Abstract
The invention provides a method for grinding and finishing the surface of a cam of an internal combustion engine camshaft through an electrochemical composite abrasive belt with reverse pulses. The method has the following advantages that firstly, the surface of the cam can be directly finished to Ra0.10 micrometer or lower through one step after being coarsely ground, so that mirror finishing is achieved; secondly, compared with grinding at the same roughness level, the productivity can be improved by three times to five times or more, and finishing efficiency is quite high; thirdly, in the finishing process, no grinding force or grinding heat is generated, so that the surface layer is free of metallographic structure changes, work hardening and stress condition changes, and the finished surface layer is high in quality; fourthly, passive film on the metal surface is mainly removed through the abrasive belt, and therefore loss of the abrasive belt is much smaller than loss caused by grinding of an ordinary abrasive belt; fifthly, sediments and microscopic peaks on the surface of an electrode are dissolved through the reverse pulses, the electrode is finished, and the shape of the electrode is kept; sixthly, the process device is simple and is convenient to operate and maintain.
Description
Technical field
The present invention relates to the Finishing on a kind of Engine Cam surface, to be combined with each other by electrochemical action and belt-sanding effect specifically, combustion motor cam face carries out polishing processing, reverse impulse has finishing effect to electrode simultaneously, is mainly used in last one finishing step on Engine Cam surface.
Background technology
Camshaft is one of key components and parts of diesel engine, and it is controlling air inlet, fuel feeding and the exhaust process of diesel engine, and the functional reliability of camshaft is directly connected to the normal operation of diesel engine and the safe operation of locomotive.The domestic cam production overwhelming majority adopts the technique of " milling external form → corase grind → heat treatment → fine grinding " to carry out cam processing.Because cam curve is to be connected and composed by several simple or complicated curves, cam profile is also irregular, thereby cause speed, acceleration " kick " acutely, and be ground instantaneous velocity a little, the contact arc length of emery wheel and workpiece and grinding points with respect to the polar coordinates position of cam center all with the change of shape of cam curve, strain, the grinding heat etc. of grinding force, emery wheel and workpiece system are also constantly changed, be easy to like this cause defect-grinding crack and the burn of cam ground.Use is refined easy generation grinding defect with the cam grainder of pattern, use import numerically-controlled cam grinder to be difficult for producing grinding defect, but import numerically-controlled cam grinder is expensive, approaches RMB up to ten million.
Summary of the invention
Object of the present invention aims to provide the Finishing on a kind of Engine Cam surface, thereby can make to process through the polishing of this technology after cam face corase grind, can make cam face roughness one step be reduced to below Ra0.10 μ m, and can keep the precision of cam.
The electrochemical copolymerization belt-sanding polishing processing method of the cam face band reverse impulse of IC engine camshaft of the present invention, utilizes processing unit (plant) to carry out, and described device is made up of rotatablely move system, electrode movement system and belt-sanding kinematic system of camshaft, the camshaft system that rotatablely moves is driven by servomotor, makes the camshaft can uniform rotation, thereby the cam on camshaft is rotated, electrode movement system is driven by servomotor, and electrode is seesawed with the rotation of cam, and keeps constant clearance with cam, belt-sanding kinematic system is driven by servomotor, abrasive band is seesawed with the rotation of cam, and be pressed in cam face with constant pressure, described processing method comprises the steps: cam to connect power supply one utmost point, electrode connects another utmost point of power supply, between cam and electrode, pass to neutral electrolyte, and between cam and electrode, apply the electric current with reverse impulse, after executing electricity, generate at cam face the passivating film that one deck obstruction cam face metal is dissolved by electric current, the passivating film of the high point of cam face microcosmic is removed by abrasive band fine abrasive immediately, expose the metal of the high point of microcosmic, thereby dissolved by electric current and continue generate passivating film, on cam face, the passivating film of microcosmic low spot, owing to not ground by abrasive band, persists in microcosmic low spot, and is protecting microcosmic low spot not dissolved by electric current, passivation-activation process so repeatedly, just makes cam face be finished to minute surface, deposit and the microcosmic spike of reverse impulse to electrode surface dissolves simultaneously, electrode had to finishing effect, to keep the shape of electrode.
The present invention has the following advantages:
1) can directly cam face be roughly ground to rear surface one step polishing and be machined to below Ra0.10 μ m, realize mirror finish;
2) compared with the grinding that reaches same roughness grade number with processing, productivity ratio can improve more than 3-5 times, and polishing working (machining) efficiency is very high;
3) in polishing process, do not produce grinding force and grinding heat, therefore superficial layer changes without metallographic structure, without work hardening, does not change superficial layer stress situation, and the superficial layer quality after polishing processing is good;
4) mainly remove the passivating film of metal surface due to abrasive band, therefore loss more common sbrasive belt grinding in abrasive band is much smaller;
5) deposit and the microcosmic spike of reverse impulse to electrode surface dissolves, and electrode had to finishing effect, to keep the shape of electrode;
6) technological equipment is simple, operation, easy to maintenance.
Brief description of the drawings
Fig. 1 is the side view of apparatus of the present invention.
Fig. 2 executes electric mode with the electric current of reverse impulse.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the electrochemical copolymerization belt-sanding finishing processing device of whole Engine Cam surface band reverse impulse is made up of rotatablely move system, electrode movement system and abrasive band kinematic system of camshaft.
Camshaft 1 is driven and is at the uniform velocity rotated by servomotor, and rotating speed is 120r/min, and the be coupling utmost point of power supply of cam;
Electrode 2 is placed on numerical control table, NC table 3, drives numerical control table, NC table 3 to move forward and backward by servomotor, thereby band moving electrode 2 moves forward and backward, and keeps constant clearance with cam, and this gap width is 5mm, and electrode connects another utmost point of power supply;
Between cam 1 and electrode 2, pass to neutral electrolyte 4, and apply voltage between cam 1 and electrode 2, wherein direct impulse is taking cam as anodal, and voltage is 16V, and reverse impulse is taking electrode as anodal, and voltage is 5V, and forward and reverse peak pulse duration is 20:1;
Abrasive band 5 is driven by driving wheel 6, is pressed in cam 1 surface upper by contact wheel 7 with constant pressure, and this force value is 30N, and belt-sanding speed is 30m/min; Belt-sanding device is driven and is seesawed by servomotor equally, to keep constant pressure;
The electrochemical copolymerization belt-sanding polishing processing of the cam face band reverse impulse of IC engine camshaft of the present invention, utilize above-mentioned processing unit (plant) to carry out, comprise the steps: cam to connect power supply one utmost point, electrode connects another utmost point of power supply, between cam and electrode, pass to neutral electrolyte, and apply the electric current with reverse impulse between cam and electrode.In the time that power supply is switched on, can generate one deck passivating film at cam face, this layer of passivating film has the effect that cam face metal is further dissolved by electric current that hinders; In the time that the passivating film of the high point of microcosmic on cam face is ground by abrasive band superfinishing, will expose fresh metal surface, thereby be dissolved by electric current, and continue to generate passivating film; On cam face, the passivating film of microcosmic low spot, owing to not ground by abrasive band superfinishing, persists in microcosmic low spot, and is protecting microcosmic low spot not dissolved by electric current; Passivation-activation process so repeatedly, just makes cam face be processed by polishing; Deposit and the microcosmic spike of reverse impulse to electrode surface has dissolution simultaneously, to keep the shape of electrode.
Claims (1)
1. an electrochemical copolymerization belt-sanding polishing processing method for the cam face band reverse impulse of IC engine camshaft, utilizes processing unit (plant) to carry out, and described device is made up of rotatablely move system, electrode movement system and belt-sanding kinematic system of camshaft, the camshaft system that rotatablely moves is driven by servomotor, makes the camshaft can uniform rotation, thereby the cam on camshaft is rotated, electrode movement system is driven by servomotor, and electrode is seesawed with the rotation of cam, and keeps constant clearance with cam, belt-sanding kinematic system is driven by servomotor, abrasive band is seesawed with the rotation of cam, and be pressed in cam face with constant pressure, it is characterized in that, described processing method comprises the steps: cam to connect power supply one utmost point, electrode connects another utmost point of power supply, between cam and electrode, pass to neutral electrolyte, and between cam and electrode, apply the electric current with reverse impulse, after executing electricity, generate at cam face the passivating film that one deck obstruction cam face metal is dissolved by electric current, the passivating film of the high point of cam face microcosmic is removed by abrasive band fine abrasive immediately, expose the metal of the high point of microcosmic, thereby dissolved by electric current and continue generate passivating film, on cam face, the passivating film of microcosmic low spot, owing to not ground by abrasive band, persists in microcosmic low spot, and is protecting microcosmic low spot not dissolved by electric current, passivation-activation process so repeatedly, just makes cam face be finished to minute surface, deposit and the microcosmic spike of reverse impulse to electrode surface dissolves simultaneously, electrode had to finishing effect, to keep the shape of electrode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410345082.3A CN104128682A (en) | 2014-07-21 | 2014-07-21 | Method for grinding and finishing surface of cam of internal combustion engine camshaft through electrochemical composite abrasive belt with reverse pulses |
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| CN201410345082.3A CN104128682A (en) | 2014-07-21 | 2014-07-21 | Method for grinding and finishing surface of cam of internal combustion engine camshaft through electrochemical composite abrasive belt with reverse pulses |
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Cited By (5)
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| CN104191054A (en) * | 2014-08-04 | 2014-12-10 | 吉林大学 | Complex surface self-adaptation grinding and polishing machine tool based on electrolysis shaping elasticity conductive abrasive belt |
| CN104708132A (en) * | 2015-04-07 | 2015-06-17 | 海安欣凯富机械科技有限公司 | Tooth division type gear tooth surface finish machining method based on double-peak pulse current electrochemical composite machine |
| CN104722864A (en) * | 2015-04-07 | 2015-06-24 | 海安欣凯富机械科技有限公司 | Planar metal surface optical finishing method based on bimodal pulse current electrochemical composite machine |
| CN104759717A (en) * | 2015-04-07 | 2015-07-08 | 海安欣凯富机械科技有限公司 | Finishing machining method for metal rotation surface based on dual-peak pulse current and electrochemical machinery |
| CN104827146A (en) * | 2015-04-17 | 2015-08-12 | 江苏华耀机械制造有限公司 | Laser-induced wheel pair surface strengthening and finishing processing method |
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- 2014-07-21 CN CN201410345082.3A patent/CN104128682A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104191054A (en) * | 2014-08-04 | 2014-12-10 | 吉林大学 | Complex surface self-adaptation grinding and polishing machine tool based on electrolysis shaping elasticity conductive abrasive belt |
| CN104708132A (en) * | 2015-04-07 | 2015-06-17 | 海安欣凯富机械科技有限公司 | Tooth division type gear tooth surface finish machining method based on double-peak pulse current electrochemical composite machine |
| CN104722864A (en) * | 2015-04-07 | 2015-06-24 | 海安欣凯富机械科技有限公司 | Planar metal surface optical finishing method based on bimodal pulse current electrochemical composite machine |
| CN104759717A (en) * | 2015-04-07 | 2015-07-08 | 海安欣凯富机械科技有限公司 | Finishing machining method for metal rotation surface based on dual-peak pulse current and electrochemical machinery |
| CN104759717B (en) * | 2015-04-07 | 2018-12-28 | 海安欣凯富机械科技有限公司 | The polishing processing method in the metallic rotary face based on double peak pulse current electrochemical copolymerization machinery |
| CN104827146A (en) * | 2015-04-17 | 2015-08-12 | 江苏华耀机械制造有限公司 | Laser-induced wheel pair surface strengthening and finishing processing method |
| CN104827146B (en) * | 2015-04-17 | 2017-08-29 | 江苏华耀机械制造有限公司 | A kind of induced with laser wheel is to surface peening and polishing processing method |
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Application publication date: 20141105 |