Engine carries the measurement of buy camshaft on the head

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  • source:AYOR CNC Machining
Camshaft is the crucial part that affects quality of job of car engine compressed air distribution mechanism, its function is to make sure engine valve group has accurate, smooth good motion curve. The measurement of cam, advocate if be the geometrical precision of each cam on assess camshaft and the dynamical character that hold machine hind,provide a basis, should press design requirement choice and cam mechanism driven so (hold out column) of identical form and appearance measure a head, rise Cheng watch to undertake metrical by the design, pass the information that measures motion curve of correct feedback cam mechanism thereby. But, as a result of cam mechanism driven form and figure are different, the motion curve of valve of appearance of same figure cam is different however. Be like to issueing buy camshaft type compressed air distribution mechanism, the measured value that raises Cheng accords with movable type driven (hold out column) motion curve; And to carrying buy camshaft on the head type compressed air distribution mechanism, accord with swing type driven the valve of columnar face promotes Cheng rule, still need conversion to become movable type driven measured value rising Cheng, be about to of rocker and cam surface contact swing the valve of type cylinder rises Cheng, plane of didymous heart movable type measures conversion the cam of the head rises Cheng. Because use plane to measure a head, the treatment that just is helpful for cam face and cam rise the measurement of Cheng, but this involved the issue of the changeover that measure a head when measuring. That is to say, when because treatment and the limitation that measure craft condition or some kind of special situation cannot use those who accord with design requirement form and appearance to measure a head,should be being encountered, allow to use method of the changeover that measure a head, use what do not accord with design requirement to measure a head to undertake cam is measured. Example analysis shows to be with the cam distributing gas of some engine exemple, from the point of design requirement, the abdomen is round paragraph it is to make sure accurate open mixes engine valve shut between quite rise column quickly and wait for decelerate to drop, and very round paragraph just make hold out column by wait to rise to transfer smoothly to wait for decelerate to drop quickly. Accordingly, design requirement abdomen is round paragraph precision comparing is very round paragraph precision is tall. The equivalent after be being changed to measuring a head rises the computation of Cheng, it is commonly take equivalent corner for as identical as design requirement corner. Such, although a number of whole cam measurement point and design requirement are identical, but the position that changed design requirement measurement point however and a number that raise Cheng to measure paragraph of measurement point each. For example, deserve to enrage cam, should want Chinese metal with the design treatment is online all rights reserved when the plane that request measures a head to take a dot to measure by 1 ° interval, very round paragraph measure a dot to be 92, the abdomen is round paragraph measure a dot to be 26, of breeze way measure a dot to be 56. But, when the roller that should use the F 15mm that does not accord with design requirement measures a head to also press 1 ° interval to take a dot to measure, very round paragraph measure a dot to be 32. After the changeover that measure a head, when should measuring a head to also take a dot to measure by 1 ° interval with the blade that does not accord with design requirement, very round paragraph measure a dot to be 12 only. Very apparent, after the changeover that measure a head, measure a head with what do not accord with design requirement, although a number of whole cam measurement point did not change, but the place that designs requirement measurement point and compositive cam outline a number of measurement point of each line segment was changed. Take equivalent corner the equivalent to design corner to raise Cheng list, the positional deviate that cam rises Cheng measurement point the design place that measures a place, this will not be overcome (eliminate) because measure a head to change the equivalent that cause to measure dot and design to measure a place,be in, the difference of error of two department figure rises the effect that Cheng measures to cam. When cam outline the tolerancepublic errand requirement of each line segment does not agree when, the miscarriage of justice that causes pair of cam possibly even to rise Cheng qualification (be abandoned by accident or close by accident) . The sort of equivalent that takes design corner to be equivalent corner raises Cheng list, without the consideration equivalent of around of the changeover that measure a head measures dot and design to measure the consistency of the dot, it is as online as treatment of protruding China metal all rights reserved round of design demand bearing be contrary to. Here should point out, the position that equivalent raises the computation that Cheng expresses to should abide by measurement point of cam of around of the changeover that measure a head is changeless principle. The academic basis of the changeover that measure a head presses as usual plan, no matter be of affirmatory cam,detect the position, still measure litre of Cheng of cam, should use with cam mechanism driven (hold out column) of identical form and appearance measure a head. For example, the driven that some engine matchs to enrage cam it is plane holds out column, plane should be used to measure a head when measuring; Driven it is roller holds out column, as identical as the diameter that hold out column roller should be used to measure a head when measuring. If was used with cam mechanism driven (hold out column) the form measures a head with what appearance differs, undertook the head is changed measuring namely. After the changeover that measure a head, answer to promote the design Cheng to express conversion to raise Cheng list for equivalent, rise Cheng to express those who measure cam to rise Cheng by equivalent. Nextpage   is current, equivalent rises the computation of Cheng, the problem does not exist on the principle. On the method seeking solution that the problem goes to rise Cheng in equivalent corner, equivalent: Equivalent rises Cheng to express beg solution equivalent to rise Cheng by the corner that the design gives out, beg those who go out is not to design the equivalent that gets check to rise Cheng, violated design of cam of the changeover that measure a head to get be cautious seat changeless principle. That is to say, if measure a changeover around corner is identical, changed cam to design the seat that gets check. After the changeover that measure a head, if still press equivalent of design corner computation to rise Cheng, cam designed the seat that gets check to be distorted, when the changeover that measure a head around suffers be cautious to be in appearance error to differ and when having bigger difference, will affect cam to rise Cheng to measure the accuracy of data, the judgement that brings about pair of cam qualification possibly even is wrong (be abandoned by accident or close by accident) . Measure a changeover to answer note and when abiding by principle cam to measure, general situation should use what ask to agree with the design to measure a head to undertake metrical. But, to some kind of special situation, allow to use not as identical as design requirement measure a head to measure: (1) cam handiwork is measured, measure middling automatically to often be used in cam especially not as identical as design requirement measure a head to measure (use same each driven that measure a head to measure same root camshaft to go up the cam with demand different figure) , the transhipment of through cargo in can measuring a process in order to discharge so (debus does not accord with those who design a requirement to measure a head, mount accords with those who design a requirement to measure a head) the operation that measures a head, maintain those who measure is successional. (2) should encounter the limitation that measures craft condition, use not as identical as design requirement measure a head to measure, be helpful for the measurement of cam and treatment, but should be a principle in order to accord with design requirement. If carry the cam distributing gas of buy type camshaft on the head, must rocker and cam surface contact swing the valve of type cylinder rises Cheng, change plane of didymous heart movable type to measure litre of Cheng of the head, convert namely plane measures a head to undertake metrical, just be helpful for machine and be being measured of cam. Cam measures a changeover to should notice the following: (1) comprise Duan Jun to be each when cam outline curve convex when, can change into (choose) plane measures head, roller to measure head, blade to measure a head to measure. (2) comprise each when cam outline curve paragraph appear when straight line segment, can change into only (choose) roller measures head, blade to measure a head to measure, cannot measure a head in order to be changed into plane to measure. (3) comprise paragraph of occurrence concave side each when cam outline curve paragraph when, can change only (choose) be less than concave side into roller radius the roller of the smallest radius measures head, blade to measure a head to measure, cannot measure head or roller radius in order to be changed into plane to be more than concave side the roller of the smallest radius measures a head to measure. (4) when undertaking changeover is measured measuring a head, when the same measurement point that must consider to measuring cam outline to go up, those who use is the appearance measuring a head that asks to differ with the design. The different figure that measure a head, the corner of the same cam that measure a place is each are not identical. Should ask according to the design (the design rises Cheng to express) , computation gives the equivalent corner that accords with cam to design requirement measurement point, equivalent to rise Cheng, rise Cheng watch to undertake metrical to cam by equivalent. When to explain: (1) general situation, should use with cam mechanism driven appearance measures a head identically to undertake cam is measured. (2) because measure the limitation of craft condition, cannot use design model to ask to measure special situation of the system, use what ask to differ with the design to measure a head to measure, it is the treatment that is convenient cam and the technology measure that measure place to adopt. (3) active equivalent rises Cheng to express is it is basis calculative in order to design corner, its deviate the place that designs requirement measurement point, rise Cheng to express those who measure cam to rise Cheng by active equivalent so, do not accord with with cam design requirement, cannot take. (4) the computation that equivalent rises Cheng to express, answer to be a basis in order to design the place of requirement measurement point, and cannot be a basis in order to design corner. Measure a changeover namely, should ask to be a principle with changing a design (abide by position of cam measurement point changeless principle) . (5) the cam equivalent corner that computation gives, general meeting appears degree, the angle value of cent, second, will measure to cam measure automatically of cam especially bring inconvenience. For this, can apply interpolation method to seek an equivalent corner approximate integer is spent (or integral component) the equivalent of the value rises Cheng. CNC Milling