The rack hob that is based on CNC gear to measure a center is measured

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Undertake to complex gear cutting tool accurate measurement and error are calculated, it is geometry all the time one of metric domain main task. Measure wide application of the technology as coordinate, correct ground is measured quickly and computational error is having very main effect to improving productivity and product quality. The geometrical character that the article is aimed at rack hob, motion of the implementation principle that measures on the center, whole is measured to control flow, each error to measure in CNC gear athletic contrail control and measure a result to undertake elaborating. The hob of rack of basic geometry character of rack hob is called again annular buckle hob or annular rack hob, it is helix rises horn to be the special gear hob of 0. Number is the head of rack hob to be counted by the tine of treatment rack Z+1, zhou Jie P is equal to by the Zhou Jie of treatment rack, multiply for π with hob modulus M, the transverse tooth thickness that is in rack hob in reference circle and tine span are equal, it is P/2, its tooth form and be machined the tooth form of rack is identical. As a result of the characteristic of the successive cutting of rack hob and tall treatment efficiency, its are used extensively in the treatment of rack [1] . CNC gear measures a center to measure the gear of implementation principle CNC of rack hob to measure a center to use coordinate to measure a principle, it is by computer pilot polar coordinates is measured machine, its mechanical movement includes axial (Z axis) , radial (X axis) , tangential (Y axis) the sharp movement of 3 direction and a main shaft (A axis) the little scope that whirligig and small displacement sensor measure a head is mobile [2] . If the graph is shown 1 times,CNC gear surveys central construction of system. The working principle that CNC gear measures a center is: The parameter of the workpiece that be measured that computer basis inputs accuses those who make each reference axis to measure movement, in measuring a process, the computer is collected ceaselessly and the cuts each axis coordinate cost when memory is same and small displacement sensor measure the indication value of the head, recorded in the data that collects be measured the actual figure of workpiece face, through constant data processing, attainable the deviation value that the workpiece that be measured measures a project accordingly, before the corkscrewed yarn error that is rack hob, teeth shape error, tooth the error such as error of lead of the error of Zhou Jie of the radial sex, chamfer that hold bit, chamfer that hold bit nicety is measured offerred very good implementation condition. Quantity of back of number of the head number that integral motion controls flow to pass rack hob, modulus, pressure angle, chamfer that hold bit, shovel and slant the basic parameter derivation such as a value goes out other each parameter that is used at measuring movement, the user can measure an error according to needing to choose to wait for, computer basis already chose to measure geometrical model generates the athletic contrail that measures continuously. Its measure motion to if the graph is shown 2 times,control flow. Above all, what will measure an a certain complete tooth that is put in rack hob is alveolar inside, pass slow the point that the means of fast search defines hob position, position of will current point is saved come down, give all waiting for to measure an error according to the basic parameter computation of hob measure start and measure terminus, measure a head to move to be waited for to first by current position measure measure start, enter first to wait for measure an error measure a process, wait for in first measure a record after measuring an end to leave the current position that measure a head, good according to already was being calculated fall to be waited for measure an error measure start, computation goes out by measure a current position to arrive below one error the athletic contrail that measures start place to go, enter the next to wait for measure an error measure a process, till what the rest may be deduced by analogy remains to measure an error measure an end. The CNC gear that metrical athletic contrail and example are based on coordinate to measure a principle measures a center before the can fast, accurate, corkscrewed yarn error that measures rack hob automatically, teeth shape error, tooth error of error of red-letter day of week of the radial sex, chamfer that hold bit, lead of the chamfer that hold bit and outside circle, mn=2 is with basic parameter below, an=20 ° , z =27, zk =16, k =9, e =4.

5, the rack hob of Dao=150 is exemple, introduce each error athletic contrail and actual measurement result [3-5] . The measurement of error of 1 corkscrewed yarn when rack hob holds card, those who stipulate face of the knife before hob wants front handlers on the right side of, it is right tooth flank in the tooth flank of upside, left tooth flank is in the tooth flank of underside. As a result of face of the knife after the side of actual rack hob need shovels tine in order to form the part after the horn after side and top, the lead that brings about hob to control tooth flank is as basic as its the lead of worm helicoid is different, outside be in basic worm helicoid to go up except two side edge, other aspect is not on basic worm helicoid. Nextpage basis national level GB/T6084, the 2001 regulations about error of hob corkscrewed yarn: The corkscrewed yarn error of blade of photograph adjacent cutting is photograph adjacent cutting blade and inside the node of homocentric and columnar surface is opposite aperture the error of the biggest axial of hob theory corkscrewed yarn. When undertaking error of hob corkscrewed yarn is measured, measure those who get reference circle corkscrewed yarn go up a series of point points, computation goes out to be measured the value of corkscrewed yarn error of rack hob, can calculate according to error of corkscrewed yarn of blade of photograph adjacent cutting go out to turn inside sum of errors of cutting blade corkscrewed yarn 3 turn inside error of cutting blade corkscrewed yarn. When the corkscrewed yarn error that measures rack hob, need changes the hand that measure a head adjust those who need the complete tine upper part that measures corkscrewed yarn is alveolar inside, should age a tine that is hob corkscrewed yarn namely, also be calculative of corkscrewed yarn error fiducial tine, control the coordinate cost of X axis in the place of reference circle radius of rack hob, y axis coordinate is 0, because rack hob helix rises horny γ to be the characteristic of 0, need to control main shaft to rotate only can, measure a head from case measure tine to begin to scan in all measure Zk cutting blade. Graph the curves of 3 error of actual measurement corkscrewed yarn that are rack hob. The measurement of 2 teeth shape error national level GB/T6084, the 2001 regulations about hob teeth shape error are checked to be in sectional measure range mediumly inside, accommodate actual dentiform the law between two academic and linear tooth form to the distance. When measuring rack hob, no matter its allow bits chamfer is straight chamfer still is helix chamfer, if existence slants,be apart from or the horn before radial is not zero hour, its point tooth form is a curve, but on cutting point each are nodded or in its on the helicoid of basic worm, consequently but the teeth shape error that pointwise measures a cutting point. The tooth form of rack hob has " point tooth form " and " the tooth form that shovel a back " cent, but both metrical theory is standard the design tooth form that is hob. When measuring point tooth form, the Y axis coordinate that control measures a head is changeless, rotate main shaft comes measure a head to break away from tooth flank, finish scanning that shovels a face to side, get the point coordinate of the place, can obtain rack hob with this the coordinate of each bits of point of different radius, curve of actual measurement error is shown 4 times like the graph. When measuring the tooth form that shovel a back, hob is in static condition, the Y axis that control measures a head takes what mark is located in rack hob to slant a value point is constant, x and Z axis linkage shovel tine root to undertake scanning to tine top from side, curve of actual measurement error is shown 5 times like the graph. Before 3 tooth of radial sex measuring the radial sex before tooth is to examine the whether acceptable important level after face of the knife before hob is ground again. When production comes out, hob just needed to measure the radial sex before tooth, after use period of time as a result of point deterioration of ropes, need gains new point through weighing face of the knife before grinding, also need to measure its precision after face of the knife before be being ground again. National level GB/T6084, the 2001 regulations about the radial sex before hob tooth: Measuring range inside, accommodate 2 parallel before actual tooth at the distance between the plane before theory. Nextpage if rack hob is had before horny γ , if the graph is shown 6 times, measure to facilitate, face of the knife before be like is not parallel at X axis, namely of hob before horn is 0, if pursue 6 (A) be shown, to will measure athletic translate into simple odd axis moves, namely the radial of X axis moves, can rotate main shaft to actual tooth in front as parallel as X reference axis position undertakes metrical again, if pursue 6 (B) be shown, this makes academic tooth flank is namely perpendicular the plane at Y axis. The error curve of radial sex is like before tooth of its actual measurement 7 are shown. The measures the chamfer that hold bit Zhou Jie error of error of red-letter day of week of chamfer of 4 looks bits is will in order to hold each a tooth-like part of anything that bits chamfer will come to to tag same head to go up undertake error calculative. National level GB/T 6084, the 2001 provisions that contain error of red-letter day of bits chamfer week about hob: Difference of circular pitch of adjacent of photograph of the chamfer that hold bit is around hob reference circle same and circumferential go up, the biggest difference of red-letter day of two-phase adjacent week is worth. When measuring hob to contain error of red-letter day of bits chamfer week, those who need to change the hand that measure a head the tooth ahead that adjusts a tine is alveolar inside, this tine is calculative of error of Zhou Jie of the chamfer that hold bit namely fiducial tine, the coordinate of X axis cost control is in place of radius of hob reference circle, the coordinate cost control of Y axis is 0, value of Z axis coordinate keeps constant, main shaft rotates successive scanning Zk red-letter day of week of the chamfer that hold bit, if the graph is shown 8 times,measure error curve actually. Before the tooth that the error can divide the lead that the measurement of error of lead of chamfer of 5 looks bits holds bits chamfer to allow bits chamfer to be straight chamfer for hob with inside the lead error of the parallelism of aperture axes and helix chamfer, national level GB/T6084, before the 2001 tooth about hob straight chamfer with inside the regulation of the parallelism of aperture axes: Before the tooth of straight chamfer with inside the parallelism of aperture axes is the measurement that approaching reference circle point inside limits, accommodate actual 2 parallel in front at the distance between the plane before theory; The lead error of helix chamfer is the measurement that approaching reference circle point inside limits, before the chamfer that hold bit the deviation with academic helicoid. Rack hob promotes role as a result of its helix for 0, when the lead error that measures the chamfer that hold bit, the coordinate of X axis cost control is in the place of reference circle radius of hob, control of cost of Y axis coordinate is 0, if allow bits chamfer to be straight chamfer criterion its main shaft maintains fall asleep, the rise that needs to control Z axis only moves can, the rise of the whirl that if allow bits chamfer,needs to control main shaft for helix chamfer and Z axis moves. If the graph is shown 9 times,measure error curve actually. 6 outside the integrated deviation that what the round radial circle outside the measurement of round radial round jumpy error beats the error is mirrorred is hob radial, national level GB/T6084, the regulation of the 2001 radial round jumpy errors about the circle outside hob: Hob is full-length go up, tooth profile arrives inside the greatest poor value that aperture center line is apart from. When the round radial circle outside measuring rack hob is jumpy, move X axis coordinate automatically 0, motion of Y axis coordinate undertakes carrying the search of blade on the head near the side outside tine top, the tine of place carrying blade on the head that searchs measures a tooth-like part of anything to rise, control measures a head to be able to overwhelm effectively on point carrying blade on the head, the coordinate value of X axis and Y axis keeps constant, promote role as a result of the helix of rack hob for 0, criterion coordinate of its Z axis keeps changeless, need to control main shaft to rotate only scanning can. If the graph is shown 10 times,measure error curve actually. The CNC gear that the last word is based on coordinate to measure a principle measures a center before the can fast, accurate, corkscrewed yarn error that measures rack hob automatically, teeth shape error, tooth error of lead of the error of Zhou Jie of the radial sex, chamfer that hold bit, chamfer that hold bit, outside round radial is jumpy the project such as the error, have measure an error rich, operation is simple, measure efficiency advanced and distinct advantage. CNC Milling CNC Machining