The influencing factor of precision of numerical control machine tool

76! Important;"> for example, the screw of 70mm×1650mm is machined on the CNC Milling of a common precision, in the morning the workpiece of 700 milling and the work look of 230 treatment is compared afternoon, the change that accumulates an error can amount to 85m. And fall in constant temperature condition, criterion the error can be reduced to 40m. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is like again, one is used at grinding of double end panel 0.

6 ～ 3.

The Bao Gang with thick 5mm piece the grinder of accurate double end panel of workpiece, 200mm×25mm×1 is machined when check and accept.

08mm steel piece the dimension precision that workpiece can achieve Mm, flexibility is in full-length inside be less than 5m. But after 1h of successive and automatic grinding, dimension span increases 12m, cooling fluid temperature rises to 45 ℃ by the 17 ℃ when switching on the mobile phone. As a result of the influence with hot grinding, bring about main shaft journal stretchy, clearance of the bearing before main shaft increases. Accordingly, for cooling fluid of this machine tool box adds 5.

5kW refrigeration machine, the effect is very ideal. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> carries out a proof, after machine tool be heated the main reason that be out of shape is influence treatment precision. But the machine tool is at temperature at any time in the environment that everywhere changes; Machine tool itself can waste energy necessarily when the job, of these energy quite a branch is heated up with all sorts of means translate into, cause a machine tool the physics of each component changes, this kind of change because of configuration different, the reason such as the difference with qualitative material and differ in thousands ways. Machine tool stylist should master hot formation distributinging rule of mechanism and temperature, take corresponding step, make heat is out of shape the influence to machining precision decreases the smallest. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> one, distributinging Portant; Margin-bottom of the temperature rise of the machine tool and temperature: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1, natural climate affects Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! With a vast territory of Important;"> our country, major area is in semi-tropical area, all the year round temperature change is bigger, change of the difference in temperature inside a day is different also. From this, people is right indoor (be like a workshop) the means of the interpose of temperature and level are different also, the temperature atmosphere differ in thousands ways all round the machine tool. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> for example, span of temperature of season of long triangle area makes an appointment with 45 ℃ left and right sides, change of temperature of day and night makes an appointment with 5 ～ 12 ℃ . Machine job shops does not have heat addition in the winter commonly, summer does not have air conditioning, but as long as the workshop is ventilated better, machine the temperature gradient change of job shops is not big. And northeast area, seasonal difference in temperature can amount to 60 ℃ , change of day and night makes an appointment with 8 ～ 15 ℃ . Annual the last ten-day of a month will come in October heating period is at the beginning of second year April, machine the design of job shops has heating, airiness is insufficient. Difference in temperature of workshop inside and outside can amount to 50 ℃ . Gradient of temperature of the hiemal inside the workshop is very accordingly complex, when measuring the temperature outdoor 1.

5 ℃ , time is in the morning 835, change of the temperature inside the workshop is made an appointment with 3.

5 ℃ . The treatment precision of accurate machine tool suffers environmental temperature to affect inside such workshop will be very big. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! The influence Portant; Margin-bottom of Important;">2, surroundings: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Surroundings of Important;"> machine tool is the hot environment that shows all sorts of layout inside limits of machine tool close quarters are formed. They include the following 3 respects. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) workshop microclimate: Be like the temperature inside the workshop distributing (perpendicular direction, standard way) . When day and night alternant or temperature of the workshop when climate and ventilated change all can produce slow change. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) workshop heat source: The radiate that is like equipment of sun illuminate, heating and high-power floodlight, the can affect machine tool whole or partial part for long directly temperature rise when they are closer from the machine tool. The quantity of heat that photograph adjacent equipment produces when move is met with shoot or the means that air flows affects machine tool temperature rise. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) medicinal powder hot: Foundation has better medicinal powder hot action, especially the foundation avoid by all means of accurate machine tool stands by conduit of subterranean heat addition, once when burst leak, the likelihood becomes a heat source that finds a reason hard; The workshop that open wide will be a very good “ radiator ” , be helpful for workshop temperature balanced. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">4) constant temperature: The workshop adopts constant temperature establishment to maintain precision and treatment precision to accurate machine tool is very effectual, but specific power consumption is bigger. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Interior of Important;">3, machine tool heats up influencing factor Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) heat source of sex of machine tool structure. If main shaft electromotor, feed servo electromotor, refrigeration is lubricant pump motor, electronic-controlled,electromotor gives out heat all can produce unripe quantity of heat box. These conditions allow to electromotor itself, but have great and adverse effect to yuan of parts of an apparatus such as guide screw of main shaft, ball, should adopt measure to give segregation. When electromotor of drive of input electric energy runs, besides have little share (about 20% the left and right sides) outside heat energy of translate into electromotor, much will use kinetic energy of orgnaization translate into by carry, if main shaft rotates, workbench motion; But inevitable still have comparative to chafe in melt into of athletic process change trains partly calorific, for example the orgnaization such as guide screw of bearing, slideway, ball and drive-box is calorific. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) the heat in metal cutting of process. The kinetic energy of the cutting tool in cutting process or workpiece is used up partly at cutting result, comparative to change cutting partly be out of shape can mix cut the attrition heat between bits and cutting tool, form cutting tool, main shaft and workpiece to give out heat, conduct the part such as the workbench clamping apparatus of the machine tool by a large number of heat that cut bits. They will affect the relative position between cutting tool and workpiece directly. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) cooling. Refrigeration is the retrorse measure that lifts in the light of machine tool temperature, be like electromotor refrigeration of cooling, main shaft component and infrastructure refrigeration. High-end machine tool often is opposite electronic-controlled box makes up cold machine, give force to cool. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! The structural pattern of Important;">4, machine tool is right the influence Portant; Margin-bottom of temperature rise: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is out of shape in machine tool heat the domain discusses form of machine tool structure, show configuration, quality distributings normally, material function and heat source distributing wait for a problem. The temperature that writtens guarantee configuration condition affects a machine tool distributings, caloric conducts direction, heat to be out of shape direction is reached match etc. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) the structural configuration of the machine tool. In total construction respect, the machine tool has type of door of vertical, horizontal, dragon and cantilever type to wait, all have bigger difference to hot response and stability. For example the temperature rise of the box of lathe main shaft of gear gearshift can be as high as 35 ℃ , make carry on main shaft end, hot balance time needs 2h left and right sides. And machining center of Che Xi of nicety of type of inclined lathe bed, the machine tool has a stable base. Rose apparently overall stiffness, main shaft introduces servo electromotor drive, go besides positive drive part, its temperature rise is less than 15 ℃ commonly. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) the influence that heat source distributings. Think heat source is to point to electromotor normally on the machine tool. Wait like main shaft electromotor, feed electromotor and hydraulic pressure system, it is not complete actually. Of electromotor calorific when just shouldering load, electric current wastes the energy on armature impedance, have additionally quite what one part energy uses up the friction work that waits for an orgnaization at nut of bearing, guide screw and slideway to cause is calorific. Can call electromotor so heat source, it is bearing, nut, slideway 2 times heat source with what cut bits to say. Heat is out of shape is all results of these heat source combined influence. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Machining center of vertical of movable type of a pillar is in Important;"> Y is mixed to the temperature rise in feed motion be out of shape circumstance. Y did not make motion to the workbench when feed, be opposite so X to heat is out of shape the impact is very little. On pillar, the slideway guide screw that leaves Y axis exceeds far drop, its temperature rise is smaller. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> this machine explained in the circumstance when Z axis is mobile heat source distributings to be affected to heating up metabolic further. Z axis feed leaves X to farther, reason heat is out of shape the impact is less, nut of Z axis electromotor leaves closer on pillar, temperature rise and be out of shape bigger also. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) the influence that quality distributings. Quality distributings to heat up metabolic influence to have tripartite side to the machine tool. One of, point to quality measurement and volume intermediate range to spend, point to the rate that change thermal capacity and heat deliver normally, the change achieves the time of hot balance; Secondly, pass those who change quality to decorate a form, like all sorts of muscle board decorate, raise hot stiffness of the structure, below the circumstance of similar temperature rise, reduce heat to be out of shape affect or keep opposite be out of shape lesser; Thirdly, point to the form that decorates through changing quality, if be in the structure is exterior decorate medicinal powder heat up muscle board, in order to reduce the temperature rise of machine tool component. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">4) the influence of material function: Different material has different hot performance data (rate of specific heat, heat conduction and linear expansion coefficient) , in same caloric the influence falls, its temperature rise, be out of shape all have different. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> 2, the test Portant; Margin-bottom of machine tool hot property: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1, machine tool heats up the purpose Portant; Margin-bottom that function checks: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Key of hot metabolic of Important;"> control machine tool is check through heating up character, understand the change of the environmental temperature with located machine tool adequately, heat source of machine tool itself and temperature change and bit more crucial response (be out of shape displacement) . Test data or music line drawing narrate a machine tool to heat up character, so that take the way to deal with a situation, control heat is out of shape, improve the treatment precision of the machine tool and efficiency. Specifically, should achieve the following goals: Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) machine tool surroundings checks. Measure the temperature environment inside the workshop, its dimensional temperature gradient, day and night is alternant in the change that temperature distributings, should measure seasonal change to be affected to what temperature distributings all round the machine tool even. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) the hot character of machine tool itself checks. Below the requirement that eliminates environmental interference as far as possible, let a machine tool be in all sorts of movement condition, in order to measure the serious main points of machine tool itself temperature change, displacement changes, the record is in enough long time paragraph the temperature change inside and crucial point displacement, usable also infrared ray heats up photograph appearance to record each time paragraph the circumstance that heat distributings. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) heat of temperature rise of treatment process test is out of shape, be out of shape in order to judge machine tool heat pair of influences that machine process precision. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">4) afore-mentioned experiments can accumulate much data, curve, heat of control of the person that will be designed for the machine tool and use is out of shape offer reliable criterion, point out the direction that take effective measures. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Heat of Important;">2, machine tool is out of shape the principle Portant; Margin-bottom of the test: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> heat is out of shape the test needs to measure a certain number of bit more relevant temperature above all, include the following fields: Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) heat source: Include drive of guide screw of electromotor of each part feed, main shaft electromotor, ball bearing of deputy, slideway, main shaft. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) auxiliary unit: Include machine of hydraulic pressure system, refrigeration, refrigeration and lubricant displacement testing system. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) rigid structure: Include lathe bed, base, slide, pillar and milling head casing and main shaft. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> places hold indium steel to measure a club between main shaft and circumgyrate workbench, 5 contact sensor was configured in direction of X, Y, Z, measure be out of shape integratedly in what all sorts of condition fall, with the opposite displacement between simulation cutting tool and workpiece. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Data processing of Important;">3, test analyses Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Heat of Important;"> machine tool is out of shape the experiment wants to undertake inside a longer consecutive time, undertake successive data logging, the course analyses processing, reflects heat is out of shape characteristic reliability is very high. If undertake error eliminate through experimenting for many times, the regularity that shows is authentic. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Heat of system of Important;"> main shaft is out of shape experiment the Communist Party of China set 5 measurement point, nod among them 1, dot 2 in main shaft upright ministry is mixed stand by main shaft bearing to be in, dot 4, dot 5 stand by Z guide course to be in in milling head housing respectively. Test time lasted in all 14h, among them before rotate speed of 10h main shaft is respectively inside limits of 0 ～ 9000r/min alternant gearshift, begin from 10h, main shaft rotates with 9000r/min high speed continuously. Can get the following verdict: Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) the hot balance time of this main shaft makes an appointment with 1h left and right sides, span of the temperature rise after the balance 1.

5 ℃ ; Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) temperature rise basically originates main shaft bearing and main shaft electromotor, inside normal gearshift limits, the hot condition performance of bearing is good; Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) heat is out of shape in X Xiang Ying rings very small; Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">4) Z to adjustable be out of shape bigger, make an appointment with 10m, be by the heat of main shaft stretchy reach bearing clearance to increase cause; Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">5) it is continuously when rotate speed when 9000r/min, temperature rise rises quickly, in 2.

Inside 5h rise 7 ℃ left and right sides urgently, and have the tendency that continues to rise, y to with Z to be out of shape achieved 29m and 37m, show this main shaft to move to already cannot be stabilized when 9000r/min in rotate speed, but can inside short time (20min) move. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> 3, machine tool hot metabolic controls Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> discusses by above analysis, the temperature rise of the machine tool and heat are out of shape varied to machining the influencing factor of precision, when taking control step, should capture main contradiction, the key is adopted one, 2 measure, obtain the result of get twice the result with half the effort. Answer in the design from 4 direction proceed with: Decrease calorific, reduce temperature rise, structural balance, reasonable and cooling. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1, reduce calorific Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> control heat source is basic measure. Want to adopt measure to reduce the calorific amount of heat source effectively in the design. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) reasonable the rated power that chooses electromotor. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! The output power P of Important;"> electromotor is equal to the product of voltage V and voltaic I, usually, voltage V is constant, accordingly, the accretion of bear, mean electromotor to output power to increase, namely corresponding voltaic I also increases, criterion electric current uses up the quantity of heat in armature impedance to increase. The conditional come off work that if we design the electromotor of the choice,exceeds rated power greatly is made, criterion the temperature rise of electromotor increases apparently. For this, undertook contrasting experimenting to milling head of milling machine of chamfer of needle of BK50 numerical control (electromotor rotate speed: 960r/min; Environmental temperature: 12 ℃ ) . Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> gets the following idea from afore-mentioned experiments: From consideration of heat source function, no matter main shaft electromotor still is feed electromotor, when choosing rated power, had better choose bigger than computational power 25% the left and right sides is advisable, in moving actually, the output power of electromotor and bear photograph match, increase electromotor rated power very small to the influence of specific power consumption. But can reduce electromotor temperature rise effectively. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) proper step is taken on the structure, reduce the calorific amount of heat source 2 times, reduce temperature rise. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> for example: When main shaft structure is designed, the coaxial that should raise around bearing is spent, use high accuracy bearing. Below probable condition, roll sliding slideway instead point-blank slideway, or use linear motor. These new technologies reduce attrition effectively, decrease calorific, reduce temperature rise. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) go up in craft, use high speed cutting. Be based on the mechanism of high speed cutting. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is become the linear velocity prep above of metallic cutting is certain when limits, be had not enough time to produce plasticity to be out of shape by cutting metal, cut bits to go up not to arise be out of shape hot, translate into of cutting energy great majority cuts bits kinetic energy to be taken away. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2, structure is balanced, be out of shape in order to reduce heat Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is on the machine tool, heat source exists forever, what need attention further is how to let heat deliver direction and speed to be helpful for reducing heat to be out of shape. Or the structure has very good symmetry again, make heat delivers direction of classics edge semmetry, make temperature distributings even, be out of shape each other offsets, become heat to be mixed in person structure. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) prestressing force and heat are out of shape. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is in relatively in high-speed feed system, often use ball guide screw two upright axial are fixed, form beforehand tensile stress. This kind of structure is right for high speed feed, besides increasing movement condition stability, be out of shape to reducing heat the error has apparent effect. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> is inside full-length 600mm beforehand the axial of drawing 35m secures a structure to issue temperature rise to be close to quite in different feed speed. Two end are fixed beforehand the accumulation of drawing structure the error is less than Chan Duangu to decide the structure with stretchy freedom of other one aspect of the matter apparently. In two end axial is secured beforehand in drawing structure, calorific the stress condition that the temperature rise that cause basically is interior of change guide screw by pull stress to turn into 0 stress or press stress. Because this is right displacement precision influence is minor. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) change structure, change heat is out of shape direction. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! The slide carriage of main shaft of axis of Z of milling machine of chamfer of numerical control needle that Important;"> uses axial of different ball guide screw to secure a structure asks in treatment 5m of error of mill chamfer deepness. Use structure of float of axial of guide screw lower end, inside treatment 2h, groove is deep deepen gradually from 0 to 0.

045mm. Conversely, use the end on guide screw floating structure, can ensure groove is deep change. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) the semmetry of appearance of geometry of machine tool structure, can make heat up be out of shape the trend agrees, make the drift of dot of point of a knife is reduced as far as possible. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> for example, japan installs cropland (Yasda) the YMC430 small machining center that accurate tool company rolls out is inferior micron high speed machines a machine tool, the design of the machine tool had sufficient consideration to heating up function. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> takes completely symmetrical position on machine tool structure above all, pillar and beam are unifinication structure, show H model, be equivalent to double pillar structure, have good symmetry. No matter the main shaft slide carriage of approximate circle is in fore-and-aft transverse still also be semmetry. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3 the feed drive of mobile axis all uses linear motor, on the structure realize symmetry more easily, 2 rotor introduce direct drive, the attrition loss that reduces mechanical drive as far as possible and. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3, reasonable cooling measure Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">1) the cooling fluid in treatment is direct to machining the influence of precision. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> undertook contrasting experimenting to grinder of GRV450C double end panel. The experiment makes clear: Machine of refrigeration of have the aid of undertakes heating up commutative handling to cooling fluid, very effective to raising treatment precision. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> uses means of conventional cooling fluid supply, after 30min, work measure with respect to out of tolerance. After using refrigeration machine, can machine 70min above normally. The main reason in out of tolerance of measure of the work when 80min is emery wheel needs prune (the metallic bits on face of purify emery wheel) , original treatment precision can reply on nap wheeler. The effect is very apparent. Same, to main shaft force refrigeration to also can expect to get first-rate result. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">2) raise natural cooling area. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> adds area of natural wind refrigeration on structure of main shaft casing for example, inside better in airiness workshop, also can rise to come loose very well hot effect. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;">3) bits of seasonable and automatic platoon. Portant; Margin-bottom: 17px! Important; Color: Rgb(34, 34, 34) ! Important; Font-size: 17px! Important; Overflow-wrap: Break-word! Important; Line-height: 1.

76! Important;"> seasonable or real time cuts high temperature bits eduction workpiece, workbench and cutting tool share, will very the temperature rise that is helpful for reducing crucial share and heat are out of shape. CNC Milling CNC Machining