Honing machine of engine cylinder body machines the control method of dimension

The steam on honing machine and description of treatment working procedure is general the honing machine of plant of engine of 5 water chestnut is Germany Glyn (Gehring) the company produces, cent is versed in for 12, be versed in by makings of pass in and out, model identifying is versed in, crock aperture rough machining is versed in, finish machining is versed in, crankshaft aperture working station, MARPOSS detects labour, retroflexion labour reach a few idle station to comprise. Working station has mechanical electron to go up knife system and hydraulic pressure go up knife system, can machine 1.

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The cylinder body of a variety of 2L model. Workpiece raises a pace to carry a system to undertake feeding machining into type through, should raise a pace to carry a system to realize accurate control through drive of servo electric machinery into type. 2.

The problem that respect of honing machine treatment exists (1) top gem of honing machine essence is versed in after changing a knife, machine first surface roughness unqualified, the knife mark that cannot enclothe thick top gem completely to stay and deep groove (see a picture 1) . Graph the 1 knife mark that cannot enclothe thick top gem completely to stay and deep groove (2) circularity of aperture of treatment occurrence crock and cylinder are spent bad, occurrence out of tolerance and slant on poor (see a picture 2) . Graph 2 occurrence out of tolerance and slant on poor (3) the crock aperture as a result of treatment is half blind aperture, diameter of ministry of crock hole bottom slants small, the handling time that need increases delay time to grow ministry of crock hole bottom in ministry of crock hole bottom comes repair, the risk that can create mark of knife of crock aperture occurrence round (see a picture 3) . Graph mark of knife of occurrence round of 3 crocks of aperture (4) honing treatment diameter slants big or slant small, affect metre and the waste that create repair. The element analysis that affects treatment measure should achieve favorable honing result, except choose advanced honing tool to reach choose correctly outside wearing a material and size, the craft parameter that uses when honing also has very big effect to machining quality. 1.

Speed of honing of honing speed V is rotate speed coming back to spend the synthesis of V1 and V2 of speed of move back and forth, when rotate speed coming back spends V1 to be 18 ～ 25m/min optimal. Experience proves, the treatment quality of crock aperture and speed of move back and forth are having immediate concern, when V2 of speed of move back and forth is 25 ～ 35m/min, reticulation horn θ is 45 ° ～ when 70 ° , honing efficiency is highest. Specific the reticulation horn that can ask according to crock aperture and treatment surface roughness, have logical choice. The parameter that the effect produces to the appearance precision of aperture when honing has 3: Arenaceous the length, length of aperture and arenaceous extend length (arenaceous a length outside aperture is extended when honing) . 2.

Treatment detects stabilizing the treatment as a result of cylinder body honing machine is to apply the way that measures directly to undertake machining, the atmospheric pressure when be being machined is not stable, school 0 occurrence errors, gas check voltage changes, flat and polite way jams metropolis influence detects cause treatment to be not stabilized detect with MARPOSS labour appear measure phenomenon of out of tolerance. We often see MARPOSS measures equipment result out of tolerance to adjust parameter, and the mistake that had not thought of MARPOSS measures equipment itself, the need before adjusting parameter so ensures check is provided first measure equipment qualification namely. Nextpage3.

Rough machining is unqualified axis 1 opposite for it is a labour of thick top gem only, have precision work appearance is amended, the appearance of 1 and surface roughness also will affect the axis the quality that to the axis 2 treatment come out, axis 1 general reservation surplus of 30 μ M gives 20 ～ the axis 2, with assuring an axis 2 have sufficient cutting amount, get good quality assures, the unacceptable state such as 2 dimension and surface roughness mixes the axis when treatment axis 1 photograph is associated, should assure an axis so the treatment quality of 1. Adjust honing in order to control dimension 1.

Appearance control is opposite through pneumatic measurement unit of aperture online measure, at the same time Glyn controls unit to return these pair of measured value to undertake analytic computation, will undertake accordingly online adjustment to honing program thereby, achieve a good measure and appearance precision from this. (1) in honing process, honing machine is right the ABC3 of aperture sectional undertake online data is collected and compare, every journey collects data, be informed the appearance of aperture thereby and undertake to its corresponding honing adjusts. Function of online appearance rehabilitate can undertake continuously in whole honing process, also can shut before honing will end. The advantage is to have first-rate honing time. (2) in honing process, honing machine is right the ABC3 of aperture sectional undertake online data is collected and compare, every journey collects data, different is to stopping honing hind, the machine tool will be right the ABC3 of aperture sectional again the static state is measured collect, measures data will get applied in the online appearance rehabilitate in next work. The advantage is to be able to obtain first-rate to measure an outcome. Graph 4 3 is planted different program (3) in honing process, honing machine is right the ABC3 of aperture sectional undertake online data is collected and compare, every journey collects data. Different is before machining dimension to arrive at, stop honing and the ABC3 to aperture sectional again the static state is measured collect, be in next next function of online appearance rehabilitate is started to undertake machining to aperture in honing. The advantage is to be able to obtain first-rate to measure an outcome. Appearance is amended in the light of different situation, case forest company offers the following appearance to revise a method: The deflection on the journey; The journey issues deflection; Distance volume increases; Distance volume decreases. Because the treatment of blind aperture suffers dimensional limitation to cannot use the deflection below the journey to amend way, reason uses the correction means of delay time. 2.

HAZ hydraulic pressure goes up automatically knife system control controls a system to go up automatically to HAZ hydraulic pressure through Glyn knife system control, make it almost OK competency is all treatment task. 3 kinds of plan are shown 4 times like the graph. (1) plan 1: After honing head enters hole, go up knife system begins Xiang Kongbi to apply pressure, until go up knife pressure reachs set value. In cutting process, this force keeps changeless from beginning to end. The ability after machining dimension to achieve is uninstalled, next cutting tool sails outside giving opening. (2) plan 2: With plan the fundamental of 1 is identical, just ask to fall in special treatment, go up the incremental ratio plan of knife pressure 1 slow (see a picture 4 medium yellow lines) . Ensure thereby machining hard metal (workpiece of the chromium that be like plating) when, arenaceous safe. (3) plan 3: Arenaceous go up differently with 2 kinds knife pressure undertakes cutting. Arenaceous at the beginning with plan the pressure of 1 undertakes cutting, achieve all the time beforehand the changeover dimension of set, enter cutting of the 2nd pace next (time pilot cutting) , go up at this moment the pressure of the knife is worth the very little pressure that reduces a set. After cutting of the 2nd pace is finished, cutting tool just is uninstalled completely, sail outside giving opening. This special honing control kind is to improve the appearance precision of the quality of workpiece surface and aperture further. 3.

EMZ electron machinery goes up the controls EMZ control of knife system basically is to pass what to going up the voltaic intensity of knife electric machinery adjusts and the demarcate of limiting current intensity comes true. Go up the adjustment of knife quantity and rotate speed, be go up in order to be opposite the voltaic control of knife electric machinery is fiducial, be opposite even at the same time all sorts of radial feed parameter of cutting tool are like PVZ, PSZ to wait undertake modulatory. In set of EMZ system lieutenant general one goes up the intensity of the biggest electric current of knife electric machinery, make in arenaceous a torque with the generation between hole wall, go up namely knife pressure won't exceed the limit from beginning to end, the setting of this limiting value also is to ensure arenaceous a protection of an overload. As arenaceous go up ceaselessly piece, go up the torque of knife electric machinery can increase apparently, achieve when torque the biggest when be worth surely, electric machinery will stop roll subsequently, keep period of time below this condition, control a system to just give out next " arenaceous had stuck rely on workpiece surface " signal, begin to use the measure that the treatment parameter that sets in the system has machining coming installing. 4.

Control of online pneumatic measurement unit deserves to have the measurement unit that enrage the mouth on honing head, way can have when honing to aperture online without the contact pneumatic is measured. The measurement that online pneumatic measures works atmospheric pressure is 0.

3MPa. Compress air by one rotates air current alloter enters honing head, the gas mouth jet that boards through cutting tool arrives on the hole wall that is machined, machine individually in gas mouth spring back pressure will generate between the surface, this pressure difference will pass gas electricity to change appearance changeover to dispatch control system for electronic signal. The pneumatic check by combinative line is provided and of internal diameter dial gauge multilayer check accused to eliminate measured error, the measurement that assures online treatment precision. The crock Kong Cheng of cylinder body of epilogue car engine suffers flaming to erupt pressure and concussion, want high temperature resistant, high pressure to pound bear already, should offer for reciprocate of piston high speed again fiducial, good fixed position and accurate and oriented, between need crock aperture and piston, cooperate clearance to want reasonable, attrition force wants small. For this, surface roughness of surface of requirement crock aperture precision of size of hole of low, crock is tall and appearance precision and positional precision are good. Acquire taller treatment precision and good exterior quality to make crock aperture honing is machined, choose craft parameter correctly, had handled the correlation between each parameter, it is the seat that increases honing dimension and precision key. This kind of problem is in in closing the function of equipment to use, domestic and international photograph has certain catholicity, solve to the analysis of a certain number of difficulty problems, reached a few to honing machine job of treatment size control has the verdict that draws lessons from a meaning. CNC Milling CNC Machining