With the precision of the machine tool of high-grade numerical control that at the plane large structural member machines control reachs management

  • Time:
  • Click:92
  • source:ZIEG CNC Machining
The treatment precision of numerical control machine tool is comprised jointly by the mechanical precision of the control precision of numerical control system and machine tool. Whether does method of pilot of the precision discretion of numerical control system, servo adjust the treatment precision of machine tool of numerical control of best and immediate impact, and the treatment precision that the mechanical noumenon precision of the machine tool also can restrict numerical control machine tool likewise, system of numerical control of influence high accuracy realizes high accuracy control. The treatment of large structural member uses aviation for the most part 5 coordinate machining center, the precision that makes phasing answer in the light of this kind of characteristic detects plan, do precision good statistic and analysis, combine TPM (complete member production conserves) the train of thought of equipment management, make good precision control, assure to machine quality. Examination of commonly used precision introduces the machine tool machine tool of 1 numerical control is common precision detects content (1) geometrical precision includes linearity, verticality, flatness, a simple move or action and twist place and parallelism. Traditional method uses marble or the metal makes the same score the tool such as appearance of feet, angle gauge, dial gauge, gradienter, collimation, by artificial operation, record data and computation by hand, precision is low, multi-purpose at Bench Machine Tool [1] . (2) positional precision includes fixed position precision, repeat fixed position precision and minim displacement precision to wait. (3) working precision is a when issue precision of pair of machine tool geometry and fixed position precision in cutting treatment condition comprehensive examination, general component is checked for individual treatment precision and machine a test specimen omnibus examination. Precision of machine tool of 2 numerical control detects convention detects method (1) convention detects method, apply square compasses, straightedge, dial gauge, dial gauge to wait undertake precision detects, measure what they suit to have onefold precision index only dispersedly, and detect precision is not quite tall [2] . (2) hardware of servo of numerical control system, detect of software detect method, the servo hardware that uses oneself of numerical control system is added detect software undertakes precision detects, detect precision Gaojuke undertakes detecting to contrail of 2 axes interpolation, detect the result mirrorred servo precision, but it cannot undertake detecting to mechanical precision. (3) interferometer of ball lever appearance, laser detects method, apply interferometer of ball lever appearance, laser to undertake precision detects, definition is high, and can undertake detecting to contrail of 2 axes interpolation, detect the overall precision that reflected servo, machine as a result. Can undertake integratedly to servo precision, mechanical precision detecting, and detect the precision index of the result states intuitionistic, fixed position correct, it is to be compared at present detect ideally method. Precision examination and adjust the precision requirement that in the light of the plane large structural member machines, reach use fixed number of year according to machine tool character, make relevant examination item, if the machine tool has,appear to call the police badly reach machinery to adjust, according to corresponding precision change undertakes relevant project is checked. The examination means branch that has according to the plan is the following 3 kinds. Examination of 1 day of precision is undertaken by operation personnel day of machine tool precision is checked everyday, main examination project is positional precision, the bag contains: Repeat fixed position precision, the machine tool machines origin precision, basically be to pass laser probe to undertake searching to machine tool origin. The precision that day checks can undertake adjustment through coordinate compensation, be helpful for assuring to machine spare parts position, ensure spare parts quality. Precision examination and the project that adjust month of examination were undertaken by maintenance technician in Feburary, arrange corresponding time to undertake checking to precision of machine tool geometry. Corresponding examination project set allows an error accordingly, undertake to exceeding the project of the error machinery or parameter are adjusted. Lunar precision examination basically is to be aimed at a machine tool to spare parts or great attention undertake, detect the project is not much, and the operation is simple, detect time is controlled for 1h, can achieve equipment branch to realize the goal of equipment trends in real time. Lunar examination basically checks project bag to contain: Main shaft and Z axis parallelism are checked; Main shaft radial is jumpy (close end and far end) ; Main shaft axial is jumpy; Main shaft and C axis coaxial are spent; C axis located at 0 o'clock precision; A axis - when 90 ° with Y axis parallelism; Lie add workbench to rotate central deviation; Main shaft clamping force detects etc. A few introduce to detect basically below project and adjust direction. (1) main shaft and Z axis parallelism detect. If the graph is shown 1 times, place horn to clear, load core club main shaft, dial gauge expresses an adsorption to be on workbench, needle of dial gauge watch points to X axis to, mobile machine tool, make core club overwhelms on dial gauge, mobile Y axis, find core marvellous apogee, make machine tool to Z to shift, till dial gauge the shift that express a needle arrives core club far end, read quantity of change of needle extraction a list, record X to the error, press souvenir to be be worth, loose souvenir is negative worth. In aviation structural member treatment precision asks to fall, limit of error of requirement machine tool is 0.

02~300mm. If detect result occurrence deviation, can compensate A to place through parameter at 0 o'clock, make achieve precision requirement. (2) main shaft radial beats precision detects. If pursue 2, the graph is shown 3 times place horn to clear, load core club main shaft, dial gauge expresses an adsorption to be on workbench, needle of dial gauge watch points to X axis to, mobile machine tool, make core club overwhelms on dial gauge, mobile Y axis, find core marvellous apogee, axis of slow and mobile Z makes dial gauge moves to stand by main shaft to be carried nearly to core club (far end) , the attention in shift observes, core of the roll that use a hand is strong, read take cost of dial gauge change, record. Claimed accuracy standard beats for close end be less than 0.

02mm, far end is jumpy be less than 0.

04mm. If detect,appear bigger error, whether does bearing of examination main shaft damage, or bearing precision drops somewhat, be secured afresh or change new bearing. Nextpage (3) main shaft axial is jumpy. If the graph is shown 4 times, place horn to clear, load core club main shaft, dial gauge expresses an adsorption to be on workbench, needle of dial gauge watch points to Z axis to, mobile machine tool, make center of core marvellous end panel overwhelms on dial gauge, core of the roll that use a hand is strong, read take cost of dial gauge change, record. Precision requirement is jumpy be less than 0.

02mm. If error is too big, according to the result judgement changes main shaft bearing. (4) main shaft and C axis coaxial are spent. Basically be aimed at have A to place the 5 coordinate machine tool that places with C. If the graph is shown 5 times, place horn to clear, load core club main shaft, dial gauge expresses an adsorption to be on workbench, needle of dial gauge watch points to X axis to, mobile machine tool, make core club overwhelms on dial gauge, mobile Y axis, find core marvellous apogee, axis of slow and mobile Z makes dial gauge shift arrives near 200mm of end panel of distance main shaft, write a program, activation " TRAORI " function, c axis moves inside total travel, record cost of dial gauge change. Allow an error to be in 0.

05mm less than. If coaxial is spent,appear bigger error, can be compensated through machine tool parameter or adjust C axis to install the position that coordinates a side. (5) clamping force of electric main shaft detects. Clamping force of electric main shaft detects is one very necessary kind detects method, basically use appropriative dynamometer to undertake. The electric main shaft that basically is aimed at 2 kinds of norms at present undertakes checking, model of a kind of cutting tool is the machine tool of HSK63 series, clamping force regulation is in 14.

4~23.

Between 4kN, model of another kind of cutting tool is HSK100 series machine tool, clamping force regulation is in 36~58.

Between 5kN. The clamping force of electric main shaft is machined to the spare parts and production safety had very big protection effect. If clamping force has differred big, whether does ungual position of knife of examination main shaft become loose, hydraulic pressure pressure is normal, it is normal that cutting tool pulls a hammer. 3 years examination of examination year precision is included in the machine tool year maintain inside content, it is the comprehensive examination that has to machine tool precision, include geometrical precision, position precision and working precision. Content contained the content that the month examines, still added an item, like verticality of each reference axis examination, each reference axis repeats precision of trends of machine tool of fixed position precision, RTCP(to check) etc, basically apply a tool to square chi of cutting tool of head of core club, ball, marble waits undertake precision detects with the record. Machine a machine tool to 5 coordinate, basically be the precision examination to RTCP, the upper part in the graph detects for ball head tool, the clamping apparatus of fixed dial gauge detects for own design tool, the kind that carries 5 coordinate linkage has simulation machine tool 5 coordinate machine condition, check precision of machine tool trends, read the cost that takes dial gauge, claimed accuracy is in 0.

05mm less than. Precision examination analysis and the record that management examines according to day and the record that the month examines, can undertake an analysis to machine tool condition, the real time precision that understands a machine tool is dynamic. Pursue for example 6 are shown, the month that for some machine tool precision checked 2010 is recorded, by outside can seeing besides C axis coaxial spends detected precision to change somewhat in the graph, other precision all relatively stable, and inside error limits. And from July the error reachs highest value, the error is in smooth condition from the back, but precision error is bigger. Because be operated by accident,operate personnel to have by June through check bring about machine tool main shaft to bump into tool, cause Z axis and loss of precision of main shaft parallelism, course parameter compensation is corrective after adjusting, precision restores to be able to run state, but mechanical precision has been lost, can machine a spare parts according to existing precision only. Because this can suggest the machine tool has the rough machining program of certain part, lest the precision of the spare parts is affected when finish machining. Also can pass year of precision servy record to analyse pertinent information, win case of change of the precision inside the time that the machine tool discards as useless to the machine tool since consign or transforms, find the area of treatment stabilization period of the machine tool, can adjust reasonably treatment task and maintain time, combine TPM begin, do the lifetime government of good machine tool. Pass the analysis to precision, apply a machine tool to undertake the craft of treatment of each spare parts allocates reasonably, according to different precision error grade and peculiar precision deviation, whether affirmatory machine tool suits finish machining or high-power cuts bits, utmost ground assures the normal treatment of high accuracy spare parts. Last word precision is checked all the time by oversight of place of our country scholar, but the examination of machine tool precision and management are crucial. The examination of machine tool precision needs to undertake executive according to cycle according to the plan, through detecting the record of precision is analysed as a result and understand a machine tool condition of real time precision. Reach management to make machine tool treatment gives equaler part through be being allocated reasonably, can raise a machine tool to machine the percent of pass of the spare parts, also can prolong machine tool life better. Combinative TPM (complete member production conserves) carry out, detect precision blend in with management among them, real time ground showed condition of machine tool precision and treatment note, the preventive maintenance that is a machine tool has made bedding. CNC Milling CNC Machining