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Because the imitate servo of 0"> tradition suffers the effect of coefficient of temperature, enlarge, the interpolation precision consistency of each axis is opposite poorer, in random two axes process error of occurrence ovality of the meeting when the circle. Digital servo solved this one problem well. Normal > number servo is relied on as hardware with DSP, the control of the positional link that introduces software means to realize servo, speed annulus and voltaic annulus. So can the laden situation with different basis, through adjusting parameter very come true to suit oneself conveniently. The newest product of German Andron company is new generation be based on personal computer, the system of open mode numerical control on Windows platform. It uses two Inter processor, have mutual communication through PCI-PCI bridge, use SERCOS of communication interface of serial real time and technology of interpolation of leather rice class. Interface of SERCOS of have the aid of of technology of digital servo drive rises numerical control system and join of fine of servo controller consumed, the transmission that improves a system substantially is led and answer speed (can reach Ns level) . Machine tool main body is even the control measure Normal > is control machine tool on machine tool of contemporary numerical control is local and calorific, the consistency of each part temperature and room temperature, uniformity can take balanced machine tool a series of measure. Normal > (1) main shaft component is main pyrotoxin, so of main shaft before bearing component configures cooling water to cover, with join of gasoline tank of the constant temperature outside machine, bearing of the main shaft before the key is cooling (or main shaft casing) temperature, with room temperature close. A few high speed connect normal temperature to compress air inside electric main shaft, take away quantity of heat of main shaft interior, control temperature rise of main shaft component. Normal > (2) use hollow ball guide screw, connect constant temperature cooling fluid, high speed of guide screw of effective cooling ball rotates in calorific, this one technology grows the action that better lasting accuracy obtained on guide screw in dragon door machine tool especially. Normal > (3) use supply fluid of many constant temperature will stabilize machine tool component (pillar, lathe bed) temperature field is even, control local heat to be out of shape. Grow lathe bed is medium ventilated adjustment in dragon door machine tool for example each local temperature change. Normal > is on machine tool of a few high accuracy, there is the channel that the liquid flows at the back of lathe bed slideway and pillar slideway, in the job constant temperature liquid passes a loop from inside these passageways, dominate field of overall and even temperature. Normal > (4) use three-dimensional temperature to compensate software, correction treatment precision. The machine tool arrives by cold conditions job in hot state process, working precision has constant change, the error that waits to all can appear to be measured certainly like slideway of axis of main shaft, Y. These errors as advocate variable (temperature) change can produce the corresponding error change that has the law, rise when temperature of main shaft end panel for example when 5 ℃ , general meeting makes main shaft looks up 0.

015~0.

02mm. Accordingly, in machine tool key the component affixes temperature sensor to determine to temperature rise is measured and input numerical control system, the compensation software computation that measures calm data by the experiment gives the compensation correction on Z axis, department of coordinate of input Z axis undertakes correction, raise machine tool precision. Software of this kind of compensation also can is opposite much axis of X, Y, Z undertakes compensating, improve original machine tool precision greatly. Technology of this one compensation applies successfully at high accuracy 3 coordinate measure the temperature field compensation of machine, previously 3 measure machine can use at 20 ℃ ± only the nicety below 1 ℃ condition is measured, go up to add sensor of on two temperature each to axis of X, Y, Z3 and workpiece now (in all 7~8) , the software through model of much dimension word is handled, can carry out below the environment of ℃ of 5~6 of 20 ℃ ± measure accurately. Normal TEXT-INDENT of 0"> intelligence machine tool: 21pt; Mso-char-indent-count: 2.

0"> United States is the advocate of intelligent processing technique and intelligent machine tool and sponsor. Going up early 80 time United States puts forward the century research develops " from adaptive control " machine tool, but as a result of a lot of automation link (if detect automatically, self-adjusting, automatic monitoring and compensation) did not solve, progress is slower. Subsequently, lab of production project of institute of technology of American state level began process of intelligent machine tool, treatment to forecast the research that changes development construction to dominate 3 plans with intelligence. The participator of this project includes the United States to make technical society (AMT) , national national defense is made with machining center (NCDMM) , the country makes scientific center (NCMS) , the country is advanced production federation (NACFAM) , federation of national tool and treatment (NTMA) , production engineer association (, plan at rolling out intelligence to machine platform in March 2004 (SMPI) technical route chart, intelligent machine tool and the intelligent treatment system that develop later (SMS) the way that plans along SMPI all the time develops. Normal > is current normative to be being done not have on intelligent machine tool, exact definition. SMPI thinks, intelligence changes a machine tool to should have the following feature at least: Normal >1. The process capability of witting oneself / condition, and can communicate with operation personnel, share these information; Normal >2. Can be monitored automatically and optimize the moving state of oneself; Normal >3. Can judge a system of fixed quotas for grain production to taste / the quality of output; Normal >4. Have self-study be used to and study capacity; Normal >5. Accord with current level, between the machine can trouble-free the ground undertakes communicating. Normal > and machine tool of ordinary numerical control or machining center depends on, intelligent machine tool besides having numerical control function, still have the intelligent function such as perception, inference, decision-making, study. To realize afore-mentioned functions, the understanding that needs pair of material purify processes and machining complex function to have objective, science and state. With respect to machine tool itself, main concentration reachs process of token, treatment to optimize at description of machine tool function with control and machine tool moving condition monitors 3 aspects, its core problem depends on developing a system kinetic and the tool that overall situation optimizes and method. Normal > cutting tool is the chief factor that causes treatment process to interrupt. From 20 centuries 50 time begin, people has begun pair of metallic cutting processes especially the damaged of cutting tool undertakes research and monitoring. Practice makes clear, the effective monitoring that cutting tool carries out in cutting can reduce machine tool breakdown to stop machine 70% , raise productivity 10%~60% , raise machine tool utilization rate 50% above. Normal > implementation cutting tool wears away and the automatic monitoring of damaged is intelligence of perfect machine tool spends the part with indispensable development. The characteristic of technology of contemporary CNC Machining is productivity tall, stability good, flexibility is strong, the wears away to already cannot satisfy intelligence to change degree to rise increasingly far requirement that relies on artificial and surveillant cutting tool. Since entering this century, control of high speed processor, digitlization, before control of make a present of and technology of spot bus line are used extensively, as a result of information processing function raise the development with sensor technology, cutting tool carries out the data that monitoring place requires to collect pretreatment to had become a possibility in treatment process. Normal > is mixed in method of cutting tool monitoring methodological respect, basically cutting force monitoring, sound projects the test instrument such as monitoring, oscillatory monitoring and monitoring of electric machinery power, involved technology basically includes system of intelligent sensor technology, pattern recognition, ambiguous technology, expert and artificial nerve network to wait. Ambiguous pattern recognition is noveller method in pattern recognition technology, can identify the wear out condition of cutting tool according to signal of cutting tool condition, use obscure concern matrix to describe the relationship between cutting tool condition and signal feature, already had the research of these respects domestic and internationally, and gained certain success. Normal TEXT-INDENT of 0"> shunt-wound machine tool: 21pt; Mso-char-indent-count: 2.

0"> shunt-wound machine tool is a foundation with orgnaization of dimensional paralell connection, the machine tool structure that makes with Cartesian coordinate linear displacement is a foundation since near two centuries and kinematic principle produced fundamental change. The cantilever bridge that shunt-wound machine tool wears lever to fasten a structure to replace traditional machine tool with the top gem and compose of two fulcrum Liang Jie will bear the weight of cutting force and component gravity. Have stiffness tall, dynamic function is good, modular rate is high, reframe easily and rigid structure is simple wait for an advantage. Normal > shunt-wound the clearest machine tool is his the good stiffness that structure of top gem wearing brings is characteristic, another advantage is his modular structure. For instance typical 6 freedom spend Stewart orgnaization is by 6 identical connecting rod branch props up athletic platform. Of branch modular the characteristic makes the many sided such as the design treatment of the machine tool is able to simplify. Normal > in addition, top gem of shunt-wound machine tool wears structural characteristic to make the machine tool has good stiffness weight to compare, the orgnaization noumenon weight of unit stiffness is able to reduce greatly, can save rolled steel in great quantities, in environment of resources of current whole world increasingly tight situation plays a significance great. Normal > and traditional machine tool are different, the cutting tool contrail of shunt-wound machine tool is " empty axis " athletic result, "Solid axle " (lever) need to calculate the rule to undertake ability receives a demand athletic according to particular kinematic solution " empty axis " orbit, go up from athletic mechanism because of this online bed even if " much axis linkage " , this also is a dominant position that shunt-wound machine tool and photograph of traditional machine tool compare place to have. Shunt-wound machine tool can realize a space conveniently the motion of complex contrail, use at the treatment of the complex part such as the mould. CNC Milling CNC Machining