Summary: Measure example through cam, the equivalent corner that causes to the changeover measuring a head when cam is measured, problem of watch rising Cheng undertook an analysis, point out the changeover that measure a head should make sure cam gets check seat changeless, deserve to enrage cam to be with S195 diesel engine exemple, the equivalent corner that the computational general formula that derivation gave equivalent corner, equivalent to rise Cheng gives out to measure a head to measure for Ø15mm roller by the planar changeover that measure a head, watch rising Cheng. 1 overview camshaft is the crucial part that affects quality of job of 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, so, when undertaking metrical to cam, should press design requirement choice and cam mechanism driven (hold out column) of identical form and appearance measure a head, the corner that by the design the requirement gives out, watch rising Cheng undertakes metrical, with mirrorring the motion curve of cam mechanism correctly. The 2 changeover that measure a head measure a changeover, not be to show simple ground measures a kind the head to change another kind to measure a head, point to to the changeover of parameter is measured when using what do not accord with design requirement form and appearance to measure a head to undertake cam is measured however. In measure, the debus measuring a head that does not accord with design requirement form and appearance, mount accords with a design to ask a group of measures a head operations of form and appearance call the transhipment of through cargo that measure a head. The changeover that measure a head and the transhipment of through cargo that measure a head is two disparate concepts. 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 of the cam distributing gas of S195 diesel engine it is plane holds out column, plane should use to measure a head when measuring: The driven of the cam that offer oil it is roller holds out column, when measuring, should use with roller the roller with the identical diameter that hold out column measures a head. But, often go up when same root camshaft the driven of each cam when the design asks to differ, this part of one's job does not use those who accord with the different form that designs a requirement and appearance to measure a head to undertake metrical, but a few gauger are measuring the transhipment of through cargo in the process to measure the trouble of the head for leave out, use unexpectedly same measure a head to measure each cam, this measures a head to change a problem to was being caused certain cam, measure automatically in cam especially when, this kind of appearance that changes the form that measure a head and form is more general. When 1 cam suffers be cautious photograph to be the same as, the graph measures a different cam corner different picture corner of the equivalent when the 2 will planar changeover that measure a head measure a head for roller and equivalent rise Cheng after begging solution to measure head form and appearance changeover, convert equivalent rises Cheng watch to measure, the problem does not exist on the principle. But active equivalent rises Cheng to express, all be a basis in order to design corner commonly and not be suffer be cautious in order to design to be calculated for the basis. That is to say, if measure the corner before a changeover hind and changeover to agree, criterion cam suffers check name a person for a particular job to differ: If measure a head to change around to get check identical, criterion cam corner is different. For example, s195 diesel engine deserves to enrage cam " sensitive dot " M, when the plane that uses design requirement measures a head to measure, 0716"(of ° of cam corner Ap=46 pursues 1a) : When using Ø15mm roller to measure a head, 1b) of graph of 53 (of ° of cam corner AG=16: When using blade to measure a head, 5228"(of ° of cam corner AD= 6 pursues 1c) . Namely cam is same the AD of ≠ of Ap ≠ AG that gets check. From this knowable, after the form that measure a head and appearance are changed, if still press design corner to calculate,equivalent rises Cheng, criterion cam designs the seat that gets check to be distorted, because measure a head to change from beginning to end,can suffer be cautious to be in cam appearance error to differ thereby, influence cam measures the accuracy of data, the judgement that makes didymous cam qualification possibly even is wrong (be abandoned by accident or receive) by accident. When 3 equivalent rise Cheng watch to because measure the limitation of craft condition to cannot use those who accord with the form that designs a requirement and appearance to measure a head,should be encountered, for example, autocycle engine carries buy camshaft on the head the cam distributing gas of type, must rocker and cam surface contact swing the cam that the valve of type cylinder rises Cheng to change plane of didymous heart movable type to measure a head rises Cheng (changeover computation sees the place such as Yang Guangxing is written " autocycle engine principle and design " (university of Wuhan mapping science and technology the press is medium 1993 the 297th, use plane to measure an ability to be helpful for machine and be being measured of cam. Be like camshaft of S195 diesel engine again, the design asks to distribute gas (into, row) cam uses plane to measure a head to measure, the cam that offer oil measures a head to measure with Ø15mm roller, if unite,use Ø15mm roller to measure a head, deserve to enrage cam to measure at this moment undertook the head is changed measuring. Each cam is unified on same root camshaft use a kind to measure a head to measure, be helpful for cam be being measured automatically. Equivalent corner, the computation that rises Cheng: Litres of hypothesis cam is the biggest Cheng (peach is pointed) the corner when is 0, cross some angle when protruding cycle, cam and point contact of the I that measure a head (I is get check) when, measure to plane cam corner is Ap for the head, correspondence rises Cheng to be Hp: Measure to roller cam corner is AG for the head, correspondence rises Cheng to be HG. If set a plan 2 medium OOi=Li, oiO1=ri+rc, consider formula to get used to cam outline in the OA=OOi+OiA=Li+(ri+rc)cosap O1A=(ri+rc)sinap AG=tg-1{(ri+rc)sinap/[Li+(ri+rc)cosap]} in OO1A each paragraphs, will go up type adapts it is corner of equivalent of AG=tg-1{(ri+rc)sinf(ap)/[Li+(ri+rc)cosf(ap)]}(1) subordinate list, watch rising Cheng (S195 diesel engine deserves to enrage cam) suffer be cautious to design watch rising Cheng (measure a head with plane) equivalent rises Cheng to express (measure a head with Ø15mm roller) remarks serial number (I) corner (Ap) rises Cheng. 55000 ° 7.
5500 circles paragraph 21 ° 7.
54720 ° 227.
5490 circles paragraph 32 ° 7.
53870 ° 447.
5459 circles paragraph 65 ° 7.
47951 ° 507.
5246 circles paragraph 1110 ° 7.
26903 ° 407.
4483 circles paragraph 2120 ° 6.
43437 ° 207.
1422 circles paragraph 3130 ° 5.
071611 ° 6.
6283 circles paragraph 4140 ° 3.
221714 ° 405.
9000 circles paragraph 4645 ° 2.
131516 ° 305.
4521 circles paragraph 4746 ° 0716"1.
873116 ° 535.
3512 sensitive dot 4847 ° 1.
674819 ° 584.
2962 fourth contact paragraph 4948 ° 1.
464723 ° 033.
6002 fourth contact paragraph 5049 ° 1.
271226 ° 072.
9822 fourth contact paragraph 5150 ° 1.
094429 ° 122.
4304 fourth contact paragraph 5655 ° 0.
461844 ° 360.
5785 fourth contact paragraph 6160 ° 0.
000060 ° 0.
0000 contact 6261 ° 0.
247660 ° 020.
2321 transfer paragraph of 6362 ° 0.
241060 ° 040.
2150 transfer paragraph of 6463 ° 0.
229860 ° 060.
1986 transfer paragraph of 6564 ° 0.
214060 ° 080.
1828 transfer paragraph of 6664 ° 0053"0.
213960 ° 0808"0.
1827 contact 6765 ° 0.
196565 ° 0.
1765 breeze way 7170 ° 0.
119570 ° 0.
1071 breeze way 7675 ° 0.
061275 ° 0.
0548 breeze way 8180 ° 0.
022180 ° 0.
0198 breeze way 8887 ° 300.
000087 ° 300.
If 0000 breeze way measure the plane of cam distributing gas a changeover for blade when the head is measured, can make type (1) , (the Rc=0 in 2) , namely AD=tg-1[risinf(ap)]/[Li+ricosf(ap)](3)hD=ricossin-1[Lisinf(aD)/ri]+Licosf(aD)-ro(4) type (1) ～ (in 4) : Ro is radius of cam basic circle: Rc measures head radius for roller: Ri is the curvature radius that gets check: Li gets the distance between center of be cautious curvature and basic circle center for cam: Ap, AG, AD measures head corner for planar, roller, blade: Hp, HG, HD measures a head to rise Cheng for planar, roller, blade. F(ap) , F(aG) , F(aD) is followed suffer be cautious position to be in cam outline paragraph differ and change. For example S195 diesel engine deserves to enrage cam, suffer be cautious to be in very round paragraph for Ap, AG, AD, in fourth contact paragraph for (60 ° - Ap) , (60 ° - AG) , (60 ° - AD) ... . Subordinate list gives out by general formula (1) , (the equivalent of 2) plan cipher out rises Cheng to express example. 4 a few specification measures the changeover of head form and appearance, just be in be measured craft condition limitation to cannot use the special occasion that accords with a design to ask form and appearance measure a head to undertake cam is measured, machine and measure adopts technology measure what be convenient cam. Equivalent rises the computation that Cheng expresses to should suffer be cautious in order to design to be a basis, and should not be a basis in order to design corner. Measure a changeover to should abide by cam to get be cautious seat namely changeless principle. The basis gets the equivalent corner of cipher out of be cautious plan, it is the horny cost of the second that spend cent commonly, can measure to cam, especially cam is measured automatically bring inconvenience. For this, can apply interpolation method to beg piece get check approximate integer is spent (or integral component) the equivalent of the value rises Cheng. Active equivalent rises Cheng to express is a basis in order to design corner, its deviate the seat that the design gets check, by active equivalent so watch rising Cheng undertakes cam is measured, be contrary to with cam demand bearing, cannot take. CNC Milling
CNC Machining