Summary: Place the structure that wears performance characteristics, machine tool in the light of what plane crossbeam machines machine tool of special numerical control, placing a part to be able to be regarded completely is rigid system, measure a principle according to sine feet side, can mix sine feet close to be put in like gradienter place an end face, the point of view that place side measures wears gyral angle to place namely. Combine fixed position precision detect method, gave out to place a fixed position precision detect reasonably after the method is of congener machine tool detect provided academic basis. Keyword: Fixed position precision repeats fixed position precision to differ value plane crossbeam to have crucial effect to plane flight reversely, crossbeam wall thick treatment is inhomogenous, affect the flight performance of the plane directly, crossbeam processes the on any account of quality, affecting the flight security of the plane directly. Before the equipment of crossbeam of homebred plane treatment basically uses device of copying of common hydraulic pressure, treatment efficiency is low, treatment quality is not high, working environment is harsh; Crossbeam treatment basically relies on special tool to finish, yield is very low, cannot satisfy national defence construction and the need that economy builds far, affect national safety badly. Can rely on an entrance only special device, but to this kinds " tall, essence, pointed " numerical control machine tool, western developed country is adopted to our country all the time restrict and close, bring about technology of our country spaceflight, aviation progress is slow. Jinan group of 2 machine tools is own profile modeling of high speed of movable type of door of the is used at machining military airplane crossbeam XHF2707 of research and development dragon is compound machining center, department country " 863 plans " in machine tool of tall, essence, pointed numerical control develops one of projects; After the development success investment of machine tool of this numerical control is used, already solved the treatment precision of plane crossbeam thoroughly, improved manufacturing efficiency. Machine tool of this numerical control is placed wear two main shaft that go up, use the cutting tool that hold clip, place frame rotate drive cutting tool to rotate, place frame rotate index of a when locate precision is this machine tool main technique, the stand or fall of its precision affects the treatment precision of plane crossbeam directly. But place worn whirl precision did not detect very well method and method, we are placed through be opposite a structure and rotate principle, the whirl that uses sine feet and gradienter to be worn to placing precision undertakes metrical, pass the treatment test and verify of product later period, should detect method and method are concise and reliable. Place worn technical requirement: Place an effective corner ± inside 12 ° limits, fixed position precision 16 ″ , repeat fixed position precision this 6 ″ standard JIS-B6330. Main shaft rotates central deviate is placed frame rotate central 100mm, place frame rotate the photograph that the center is a space is nodical, it is fictitious, cannot rotating central installation is measured tool and place metrological implement. Place worn structure according to the machine tool, can will place a part to serve as a rigid system, measure a principle according to sine feet, can mix sine feet close to be put in like gradienter place an end face, the point of view that measures right now wears gyral angle to place namely. Examine measure 1. Working mesa is transverse, fore-and-aft place casing type gradienter, move workbench to big n. 2. Placing an installation inside taper hole of two main shaft to examine arbor, gradienter of type of a casing is placed to make arbor and working mesa parallel on arbor. If have an error, rotate place frame to parallel. 3. Institute of as above plan is shown, place frame on transverse put close like gradienter, close like gradienter transfer to a lower level feet of sine of a 200mm joins fixed, sine feet is fore-and-aft, transverse fixed position. Close to read numerical value like gradienter when 0 ° for 0, it is metrical datum mark at this o'clock. 4. Place a 0 ° to arrange hour hand to rotate to be worth, anticlockwise to lose a value, be in through computation gauge block of underlay of 200mm sine feet, make sine feet measures face and datum mark parallel. Ordinal rotate 3 ° , 6 ° , 9 ° , 12 ° , 15 ° , toward whirly turn to 12 ° , 9 ° ... - 12 ° , - 15 ° , go to again next return - 12 ° , - 9 ° ... to 0 ° . In measuring a process every rotate 3 ° stop 100 seconds to undertake reading, trade gauge block. After measuring, wear to placing according to actual measurement value undertake adjust and be compensatinged. 5. According to sine feet principle, place through computation wear every to rotate 3 ° , reach the dimension of gauge block: When 3 ° of ± 10. 4672mm; When 6 ° of ± 20.
9057mm; ± 90 when 31.
2869mm; When 12 ° of ± 41.
5823mm. 6. Every rotate 3 ° are measured, reading of ＝ of actual measurement value is worth - nominal value, when 0 ° actual measurement value arranges hour hand (to) the ↑ that it is A1, anticlockwise (retrorse) actual measurement value is A1 ↓ ; Suitable hour hand rotates 3 ° , come here value of dot actual measurement is to B1 ↑ , anticlockwise rotate come here value of dot actual measurement is retrorse B1 ↓ ; Ordinal rotate to be worth ↓ of C1 of the ↑ that it is C1 to the actual measurement when 6 ° , rotate to be worth ↓ of D1 of the ↑ that it is D1 to the actual measurement when 9 ° ; Rotate value of 12 ° actual measurement is ↓ of E1 ↑ E1, anticlockwise rotate - value of 3 ° actual measurement is ↓ of F1 ↑ F1; - value of the actual measurement when 6 ° is ↓ of G1 ↑ G1; - value of 9 ° actual measurement is ↓ of H1 ↑ H1; - when 12 ° , actual measurement is worth ↓ of I1 of the ↑ that it is I1. 7. G4F100 of of of C-3 of of of GOG91C3 of of CSUB1 P4 of of of GOCO of of G90G54 of of CSUB15 of of of M17 of of G4F100 of of GOG91C-3 of of of CSUB2 of of of M17 of of C4F10O of of of GOG91C3 of of of CSUBI of of means of moving program loop. of list of actual measurement value 1) fixed position precision measures: 2) repeat fixed position precision to measure, retrorse differential measurement: Choose 12 ° 0 ° of 6 ° - 6 ° - foreword of traverse of 12 ° hand measures actual measurement at every o'clock 7 times to be worth respectively: 3) examine result: Fixed position precision: 7 ″ , repeat fixed position precision 3 ″ , retrorse difference is worth 3 ″ . Placed this worn precision to get assuring through measuring. Conclusion: Should detect methodological course carries out test and verify, the method is concise and reliable, after be of congener product detect provided academic basis. CNC Milling