Use what passing statistical quantity chamber to measure machine (CMMs) , cannot be in quite below a lot of circumstances process control respect offers seasonable and effective solution. Current, OK and direct will measure machine installation to be in workshop spot, the made indispensable one part in making production circuit. Bring into production process control, be opposite thereby any can take action immediately unusually. Online measure or stand by product line to undertake metrical, can reduce the time that adjusts product line significantly, shorten thereby taste the time that puts in the market newly. Measure machine replace gradually, the inadequacy of OK and compensatory traditional and special measuring tool. Actually, measure is being measured do not have on speed but compare, but sometimes its confine is not acceptability likewise, especially it can be finished only measure relatively (undertake comparative with example namely) , lack flexibility so. Use " the flexibility of workshop spot " concept, the strategy of size quality control that allows a company is able to develop. Use a convention " the adjustment that is based on a mistake " detect the method will judge workpiece to whether be inside tolerancepublic errand limits, just appearing unusual when the reason that just discovers generation fault. This kind of method can traverse more effective land " pilot is adjusted " the method replaces, can incline to of in real time check out procedure, precaution has the generation of blemish workpiece, provide necessary information to optimize production process. To the user, a major attribute that measures machine place need depends on getting used to the application of workshop spot size control effectively to need, namely: Good dynamic character is led with getting used to appropriate sampling to count; The precision of certain level; Assure to accord with production work to accord with the requirement that designs tolerancepublic errand; Facilitate use, even if the handlers that does not have setting of special and metric knowledge also can be used; Go up expediently, next makings operations; Below the circumstance of need, need conformity is in production process, in the measurement with be not affected normal the circumstance of machine operation falls, can off line generation measures an order; To measure machine provide the necessary protection that avoids environmental effect, the person that can guarantee handlers is safe. Be based on the reason of above, the measurement that suits a workshop machine adopted specific technical plan, make machine can better resist the influence of outside ambient. Temperature of environmental temperature environment and temperature gradient are the most crucial factor that measures machine safeguard to measure machine precision. On one hand, the measure that international standard considers physics is hypostatic is consulting temperature is a standard below 20 ° C; Additional on one hand, the temperature condition of general production environment is endless and same, the temperature that goes up as time and space changes and differ somewhat. General situation, in the improvement that takes no account of workshop spot environment, make temperature does not produce the premise that changes substantially to fall, the temperature limits of workshop spot arrives in 18 ° C between 35 ° C, the change of gradient of the temperature inside 24 hours is in 10 ° C. Will measure machine installation to be in directly workshop spot, make make the component with production indispensable process. How temperature is opposite measure machine cause an effect apparently, when temperature rises, material can expand. Have the stuff of tall coefficient of thermal conductivity, for instance aluminous, often can adjust the difference of its temperature and external temperature quickly. They are opposite normally temperature gradient is very sensitive, can achieve temperature balance quickly. The stuff that has rate of low heat conduction (for example granitic, cast-iron) , the effect that suffers temperature environment change is slower, the influence that they change to fast temperature gradient is not sensitive, they maintain the time of temperature to grow quite, what dimension changes is slower also. Below these two kinds of circumstances, it is when gradient appears obtain correct measurement result, need uses temperature to compensate a technology, make measure a result to be able to return to ideal situation to fall. Still need to consider temperature factor to be being measured the influence of workpiece, because detect the dependability of the result will with both having close relationship. It is facilitating resolution, measure area dispenses the problem related machine and the issue related to workpiece. Usually ambient conditions and condition of temperature of international standard environment (20 ° C) differ somewhat, this is not a big question. In temperature condition stable circumstance falls, can try to forecast and be compensated. Nextpage great majority is measured machine on the design do one's best ensures the linear of its component expands, can adopt linear compensatory method thereby will all measurement as a result automatic compensation comes below condition of 20 ° C. In be operated actually, the rapid change of temperature (temperature time gradient) , the space of temperature changes (temperature space gradient) often can arise measuring machine is whole inhomogenous change of the space, cause those who measure machine geometry to go up to be out of shape thereby. Below this kind of circumstance, be hard to undertake compensating quite normally. Measure machine be to use all sorts of different material to be made, the character of every kinds of material also differs somewhat, this element is having crucial effect in this kind of phenomenon. For the help correctly assess mixes the user to measure the performance of machine quite, adoption provision (for example ISO) need manufacturer specification is measured machine the temperature condition that makes sure precision circumstance falls (absolutely temperature, the temperature on temperature gradient, time and space changes) . Material and structure come for years, survey the manufacturer of machine the choice about material and relevant compensation method form two apparent school. Such making use material of low temperature conductivity and the workshop that use data of high temperature conductivity model measure machine coexist. Former stabler inside short time, but in in meet for a long time brief defer; Latter response is quick, can achieve temperature balance quickly. Usually, best choice is a basis of the structure as far as possible symmetrical. The solution is can react reliably measure the geometrical structure model of machine, undertake compensating to the model thereby. The rigid structure that is based on reasonable design is very main factor of course. What measure bridge of machine nicety triangle for instance is sectional offerred parameter of good tigidity, quality. Use the air bearing that coequal span distributings, the centre of gravity of three angular cross section is inferior, such making that machine tigidity is more better, firm. No matter use the sort of compensation system, in workshop spot it is impossible to obtain with lukewarm the precision that controls a coequal standard and dependability. What we see no less than of structural temperature compensation, linear temperature compensation can compensate the part below workshop environment to measure machine precision only. In view of this, group of Hexagon metric industry is used be based on structural temperature compensatory advanced system, metabolic affects pair of machine structures that because place of temperature gradient change is caused,can amend. A. C.
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Technology (temperature environment changes get used to compensation oneself) be based on machine structure and material technology on one hand, on the other hand, what place the numerical value that obtains on temperature sensor according to the crucial point of machine structure. Advanced algorithm can according to the structure expand to detect with what be out of shape the index amends workpiece in real time data. To make this compensation system effective, measure machine need to have good dimension stability. Below this kind of circumstance, the material that need makes appliance has tall heat conduction is led (achieve temperature to balance quickly) , material as far as possible even (make metabolic impact the least) . Use record of this one party, measure machine and workpiece to be able to reach a temperature roughly, namely surroundings temperature. Measure the data that obtains on machine from mobile bridge, test and verify A.
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The technology is one is when the change with temperature big happening, reduce the effective method that measures uncertainty significantly (30 ° of 15 ～ C, span of the biggest temperature is 10 ° C/24h) . In 16 ～ to finish 26 ° C is mixed span of the biggest temperature the environment of 5 ° C/24h changes, we still can offer CLIMA option. With segregation the cover is between segregation below a few circumstances, measure machine installation to be in ventilated or lukewarm between the segregation that accuse inside, reduce the effect that temperature and temperature gradient cause thereby, make humidity keeps consistent. Additional, still can protect between segregation measure machine avoid suffer dirt and smeary effect. Segregation cover can include only commonly measure machine, and between segregation usually besides accommodate measure machine, still can provide working space for handlers. These two kinds of plan can provide absolutely security for machine operation. Ventilated cover keeps consistent with the temperature that will hold machine construction and external temperature commonly, such temperature gradient change is minor, avoid to measuring a space to produce temperature estate thereby. Very apparent, can make the impact of temperature the least change but indelible. Measure without pilot to prevent machine is metric of function reduce, need is being measured appropriate compensation system is used on machine. Lukewarm accuse make measure machine be in good position, have consistent operation temperature. Those who need an attention is, the temperature condition when measuring and the temperature condition of the workpiece that be measured differ somewhat (environmental temperature) . CNC Milling
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