Measure the measurement of machine to raise 3 coordinate speed, shorten measure cycle, analysed an effect given the factor that 3 coordinate measure motor-driven condition error. Measured the particular structure of machine to make an analysis to 3 coordinate, measure what small appearance undertook error of dynamic deflexion horn to measure with inductance, turn the means of the dynamic displacement error that derives by dynamic deflexion the error is gotten measuring a head is in. In the meantime, undertook discussion to the error that causes by the linearity of slideway. Pointing out dynamic error basically is the deflexion that circles joint of gas surplus slideway by each component and itself of each moving link bend be out of shape cause. From theoretic can prove, in stiffness of moment of force of gas surplus slideway and crossbeam flexural rigidity foregone circumstance falls, should measure the deflexion horn error that gives sliding stock of slideway of surplus of two side gas only, the dynamic displacement error that can get measuring head place is in. 3 coordinate measure the static state of machine or accurate static receiver error is main 3 parts make the error that by geometrical error, component finite stiffness causes, hot error. Often adopt error amendatory method to reduce static state or accurate static receiver error. Besides static state or accurate static receiver error, 3 coordinate are measured machine the precision that measures an outcome still gets the influence of dynamic error. Measure engine speed accelerate make dynamic error bigger to measuring the effect of the result. Measure the dynamic error of machine as 3 coordinate bigger and bigger to measuring the effect of the result, the research that measures motor-driven condition error to 3 coordinate also more and more get of people take seriously. Dynamic error basically is measure the structural character of machine by 3 coordinate, be like quality distributing, of character of component part stiffness, damp, control and decision of perturbed force place, of the deflexion that circles joint of gas surplus slideway by each component and itself of each moving link bend be out of shape cause. Should measure when speed is inferior, this one error is very small, negligible not plan. Should measure when rate is higher, measure in high speed scanning especially in, this one error is bigger to measuring a result to affect. Graph 3 coordinate measure process of 1 laden change metabolic circumstance sees the typical load in accident travel process graph 1. In studying to the experiment of dynamic error, the deflexion horn error that often measures each component to circle joint of gas surplus slideway is easier. The dynamic deflexion error of each component rises integratedly, make the dynamic displacement error that the position that measure a head is in. To estimate the volume of this one error, weekers offerred a kind of kinematic model. Because 3 coordinate measure the diversity of machine sort, the model often does not have catholicity. The article measures structure of system of machines and tools in the light of a kind of 3 coordinate, undertook error of dynamic deflexion horn measure, turn the means of the dynamic displacement error that derives by dynamic deflexion the error is gotten measuring a head is in. One, theoretical analysis experiment considers to use measure the structure of machine to see a picture 2. Crossbeam drives X- sliding stock and movement of direction of Y of the edge that measure a head, x- sliding stock is on crossbeam edge X to shift, installation drives Z of the edge that measure a head in the Z axis on sliding stock to shift. All slideway are gas surplus slideway. The X that there is semmetry respectively in the or so two end of crossbeam among them to gas surplus slideway. In process of high speed campaign, the distributinging mass action of sliding stock of crossbeam itself, X- and Z axis is on crossbeam, brought additional force, make crossbeam photograph is in generation deflexion to enraging float slideway, make crossbeam produces trends to bend, all these deflexion will cause dynamic error. Graph the 2 particular structures that measure chance construction beam see a picture 3. Adoption coordinate shafting is machine coordinate to fasten. A and B are joint of gas surplus slideway. Set A to nod the distance between X- sliding stock to be A, b dot is B to the distance between X- sliding stock. Center force to be P by what the quality of X- sliding stock and Z axis brings, bring by the distributinging quality of crossbeam all cloth force load is Q. Graph 3 beam structure is measured in high speed in, the force that arises as a result of distributinging quality will make crossbeam happening bends be out of shape, and the gas surplus slideway of A, B also has certain stiffness, make photograph of X- sliding stock also produces certain deflexion to slideway. Such, will have in A, B additional action of pitching moment MA, MB, of crossbeam happening is complex be out of shape. Because 3 coordinate measure the complexity of structure of system of machines and tools and motion, the size of the force in athletic process is very difficult exact those who know, want to solve this one problem through the way of other so. When axis of crossbeam edge Y moves, dynamic deflexion error is the deflexion role that confuses Z axis, can express with ε Z(y) . From theoretic can prove, in stiffness of moment of force of gas surplus slideway and crossbeam flexural rigidity foregone circumstance falls, should measure only vent one's anger A of float slideway sliding stock, B the deflexion horn error 2 o'clock, the dynamic displacement error that can get measuring head place is in. The dynamic deflexion part that is set in dot of A, B to be measured is Z(y)B of ε Z(y)A, ε respectively, criterion (the stretch model amount that 1) sets crossbeam is E, inertial quadrature is L, criterion type (1) can be written for (the pitching moment stiffness that 2) sets gas surplus slideway is Kair, make Kbeam=El, criterion type (2) can be written for (3) by type (3) can be solved piece (in type of 4) (5) , λ =(1+a)/(b-a) . The dynamic displacement error that sets office of the position that measure a head is δ Y(y) , criterion (6) type (each heft is begged respectively in 6) piece, ( of 7)(8) (9) (10) can see from above, when the value of A and B is more adjacent, (A-b) → 0. With type (7) ～ type (the result that 10) gets will have bigger inaccuracy. To solve this one problem, we are divided measure vent one's anger float slideway A, B outside Z(y)B of the Z(y)A of ε of deflexion horn error 2 o'clock, ε , the Z(y)P of ε of deflexion horn error that surveys office of the position that measure a head additionally. To ε Z(y)P, have (in 11) type, era enters type (11) considers MA=Kair ε Z(y)A and MB=Kair ε Z(y)B, have (12) type (12) and type (3) couplet stands, can solve a P and Q. The dynamic displacement error that the position that measure a head is in is δ Y(y) to be able to be used with type (7) ～ type (the method with similar 10) reachs. 2, experimental process and result are in the experiment, the deflexion horn error that often measures each component to circle joint of gas surplus slideway is to compare easy and feasible. The dynamic deflexion error of each component rises integratedly, make the dynamic displacement error that the position that measure a head is in. The deflexion horn error that measures each component to circle joint of gas surplus slideway has a lot of methods, get well and truly metrical an outcome with laser interferometer for example. But the measurement of laser interferometer suffers environmental parameter as a result the impact is bigger, taller to using an environment to ask. Be in actual in, often hope to use simpler method to finish measure the task. To achieve this one goal, we are measured in studies 3 coordinate the test had with other method on machine, adoption instrument is small displacement sensor. What apply actually is inductance measures small appearance in the experiment. Graph the Z(y)A of deflexion horn ε that 4 circle Z axis with measuring A to nod is exemple (see a picture 4) , 2 inductance that pass demarcate measure small appearance to measure a head to be decorated respectively mixed at 1 o'clock perpendicular at 2 o'clock at face of Y guide course. The inductance that was set at 1 o'clock measures the measured value of small appearance to be D1, the measured value that measures small appearance in the inductance 2 o'clock is D2, 1, the distance on direction of axis of X of the 2 edges between 2 o'clock is L, criterion the Z(y)A of deflexion horn ε that A dot circles Z axis is (the method with each angle usable and similar error measures 13) other piece. ε Z(y)A measures a result to see graph 5a. Right now, measure the speed of machine to be 100mm/s, acceleration is 100mm/s2. In measuring a process, we discover the flatness of slideway face to have very big effect to measuring the accuracy of the result. To remove factor of this one error, we nodded the Z(y)A of deflexion horn ε that circles Z axis to undertake the static state is measured allowing to A. Measure the speed of machine to be 10mm/s at this moment, acceleration is 10mm/s2. Measure a result to see graph 5b. Graph 5 measure an outcome the result of comparative figure 5a and graph 5b, we can see, started to cause the deflexion of sliding stock with the force of decelerate phase. Quantity of this one deflexion will cause the displacement error that the position that measure a head is in. Same, because the flatness of slideway face also can bring about the deflexion of sliding stock, cause the displacement error that the position that measure a head is in thereby. In this experiment, because the flatness of slideway face brings about the biggest deflexion of sliding stock,be 0. 012mrad, error of the biggest dynamic deflexion is 0.
018mrad. 3, stiffness of gas surplus slideway is measured can see, gas surplus slideway remains the segment with poorer stiffness, its are main the reason is gas film stiffness poorer. In actual research process, enrage the stiffness of float slideway for understanding, often adopt the method that measures directly. Current, about the experimental research of aeriform bearing stiffness, still stay in the static state to test level. 3 coordinate are measured machine in applying actually, rate has certain restriction. Although be in process of high speed campaign (V=1000mm/s) , speed and sonic photograph are more inferior than still be being compared, can replace the dynamic stiffness here so with static stiffness. Graph the measurement unit of stiffness of moment of force of slideway of surplus of gas of 6 measurement unit sees a picture 6. Those who use different weight is heavy piece have to load. The corner change of sliding stock uses inductance to measure small appearance. Measurement technique and graph are shown 4 times identical. Set pitching moment change to be Δ M, corner change is Δ θ , criterion pitching moment stiffness is (14) 4, 3 coordinate measure conclusion the dynamic error of machine basically is the deflexion that circles joint of gas surplus slideway by each component and itself of each moving link bend be out of shape cause. Should measure when speed is inferior, this one error often very small, negligible not plan. Should measure when rate is higher, measure in high speed scanning especially in, this one error is bigger to measuring a result to affect. In studying to the experiment of dynamic error, the deflexion horn error that often measures each component to circle joint of gas surplus slideway is to compare easy and feasible. The dynamic deflexion error of each component rises integratedly, the dynamic displacement that makes part of the position that measure a head by accident mark is measured machine sit compose, the specific written guarantee that obtains moving is poor. Accordingly, the changeover of the dynamic displacement error that should survey an office in the light of sum of errors of 3 condition deflexion concerns. Use the method that the article formulates, can reckon 3 coordinate measure the volume of motor-driven condition error conveniently. In 3 coordinate there is very big effect in measuring what design and survey plan of machine to optimize. CNC Milling