Village cropland machinery is rolled out lade new model of the main shaft activity of exercise automation lathe

 Village cropland machinery developed main shaft activity lathe ” MV200 ” . Chuck dimension is diametical 250mm. Be 205mm with chuck diameter ” MV120 ” identical, although use model for the hand,its characteristic is, came true to carry work by main shaft chuck however. Need not make installing preform to wait to main shaft chuck lade exercise.

Because can tear open outfit workpiece from chuck of tendercy main shaft, accordingly, move type photograph to compare with the hand, operation error is less, tear open outfit time shorter also. Lathe makes preform is machined below the to load when machining in work staff, until take out already completed work till, the time that place of this a chain of movement spends is 3 seconds (this company is measured) . The automation that works through lading, rose average machinery of exercisable of personnel of every master course of study is counted.

When much stage MV200 arranges compositive product line, as a result of working procedure by artificial bearer, accordingly, satisfy the requirement that working procedure changes his costume or dress more easily. Additional, still but compose is built suit to undertake varietal and variable sheet manufacturing product line.

Respect of fast feed career, x/Z axis is 40m/ cent and 30m/ cent respectively. Can machine below standard circumstance most greatly the workpiece of long 100mm of diametical 200mm × . Turn except 10 horn servo besides the head, still installed auxiliary whorl to comb stage of knife cutting tool. Can deploy on stage of this cutting tool rotate cutting tool component, go burr component and grinder component, the concentration that realizes working procedure thereby is installed.

Numerical control lathe machines spherical error analysis to reach eliminate a method

Graph the error sketch map of axis of X of deviate of point of a knife of 1 lathe tool

When the treatment on numerical control lathe is spherical, appearance error influencing factor and eliminate a method to be as follows.

    The error that axes of main shaft of deviate of lathe tool point of a knife causes and eliminate a method (it is exemple) with the ball inside the car. If the graph is shown 1 times, ∆Y is the distance of axis of X of lathe tool deviate, dt is diameter of theory of A-A section plane, d needs ball diameter for place, r=D/2 amount to accuses radius of interpolation of circular arc of lathe cutting tool. On A-A section plane curve of interpolation of cutting tool circular arc shows long axis to be kind of ellipse of D1 for D, short axis, its error is for D=D-D1=D-2[(D/2)2-∆Y2]½(1) in actual production, product blueprint should put forward to be machined commonly ball diameter precision. If machine ball bearing precision to be in commonly ± 0.005mm less than, namely D=0.01mm. To assure this precision, must control ∆Y. By type (1) knows ∆Y= ± ½(2Dd-d2)½(2)

    Graph sketch map of 2 pairs of knives

    Set D=80mm, when machining ball bearing, computational earning | ∆Y | ≤ 0.63mm. If pursue,to knife method 2 are shown. The numerical value on dial gauge is ∆Y value namely. The influence of error of the centre of a circle of interpolation of cutting tool circular arc and eliminate a method (with the car inside spherical for exemple) show 3 times like the graph, ∆X is the distance of axis of Y of deviate of the centre of a circle of interpolation of cutting tool circular arc, d needs ball diameter for place, d1 is XOY plane to go up to machine a diameter actually: D/2 is radius of interpolation of cutting tool circular arc. Visible, on XOY plane, error D=D1-D=2∆X: On XOZ plane, the elliptical ball that shows long axis diameter to be D for diameter of D1, short axis, its errorD=D1-D=2∆XCompare a law to remove the effect of error of the centre of a circle of interpolation of cutting tool circular arc with pointwise.

    Graph the centre of a circle of interpolation of circular arc of 3 cutting tool affects sketch map (inside spherical)

    (A)2∆X>0, to compensation ∆X

    (B)∆X<0, lose to compensation ∆X
    Graph 4 cutting tool compensate sketch map

    Thick car sets D to need for place inside ball diameter, 1 ~ 1.5mm stays when thick car surplus of half fine vehicle, namely A1=D-(1 ~ 1.5) . internal diameter of thick car ball A1 of diameter of interpolation of the circular arc in real measure and program is compared, get error of center of main shaft of deviate of the centre of a circle of interpolation of cutting tool circular arc to be 2∆X. Be like 2∆X>0, criterion direction of edge X axis to compensation ∆X, be like 2∆X<0, lose along X axis direction to 4) of compensation ∆X(graph. Half thick car leaves surplus of 0.5mm fine vehicle, namely A2=D-0.5, measure next, quite, method of cutting tool compensatory is Alexandrine, give place to need till the car inside spherical.

Spherical principle is same inside car spherical outside surface and car, compensation way is same, what what differ is cutting tool installation way is opposite.

    Because pace of numerical control lathe enters electromotor pulse equivalent to be able to be amounted to 0.01, 0.005, 0.001mm, precision of curve of circular arc interpolation is in accordingly ± 0.01, ± 0.005, ± 0.001mm, the basis is machined spare parts demand, choose corresponding numerical control lathe, can satisfy production to need actually.

    The hand of numerical control lathe uses control

          Numerical control lathe moves an operation through the hand of Control Panel, achievable feed motion, main shaft rotates, bits of switch of cutting tool dislocation, cooling fluid, platoon implement open stop wait for a movement.
     
        One, feed motion operation

        Feed motion can be divided move feed for successive feed and dot. Both distinction is: Below type of hand movable mould, press coordinate feed bolts, feed component moves continuously, till till loose coordinate feed bolts; Condition is moved to fall in the dot, every press coordinate feed key, feed component is only mobile beforehand the distance of set.

         Feed operation includes successive, dot to use the option of means, the setting of feed, feed direction control.

         2, main shaft and cooling operation

        Below type of hand movable mould, can set main shaft rotate speed, the main shaft that start, invert and stop, cooling fluid leaves, close etc.

        3, the hand is moved change a knife

        Change the numerical control lathe of knife device automatically to having, can make tool carrier automatic through order injunction dislocation, also can move control tool carrier to change a knife through face plate hand.

        4, platoon bits implement control

        Press corresponding pushbutton can control a bit implement turning, invert and stop. Turning use at discharging bits, will discharge bits when scrap implement when card lives, usable invert come away.

    Circular arc of point of a knife machines medium influence in numerical control lathe

    Graph 1

    Graph 2

    1 foreword is in use process of numerical control lathe, be machined to reduce the surface roughness of workpiece surface, slow down cutting tool wears away, improve cutting tool life, normally form of circular arc of wear of blade of lathe tool point of a knife, circular arc radius is commonly between 0.4 ~ 1.6mm. Use radius of point of a knife compensates a function (the numerical control lathe of G41, G42) , want to press work measure process designing directly in machine program only, won’t cause machining error because of circular arc of point of a knife; And the numerical control lathe that does not have this function, can get in treatment the influence of circular arc of point of a knife, serious when, can cause workpiece out of tolerance to discard as useless. Pursue now the treatment with a spherical SR10-0.04 in showing work will discuss this issue. Analysis of 2 machining error is in the use of lathe of economy numerical control, we are used normally try cut a way to the knife, such, the knife that machine program place describes the dot is P dot (graph 2) , and what attend cutting actually is circular arc of point of a knife (radius of circular arc of here point of a knife is not P dot for 0.4 Mm) , because this P point is real nonexistent. So, the error of different level exists between the contrail that the P that machine program place describes nods and effective treatment outline. But round outside turning, inside when aperture and end panel, this error is 0. And when machining dambered surface and cone, this error is apparent. The machining error analysis with spherical SR10-0.04 sees a picture 2. In the graph, the contrail that the P that M line describes for machine program place nods, namely the theoretical size of workpiece, and the outline after be being machined actually is N line, the shadow is the hypostatic part of little cutting, namely machining error. We use CAXA electron plate medium ” elemental attribute inquires ” function, check N line is the circular arc that a paragraph of radius is 9.6mm, the biggest error is 0.17mm about, if this error is inside tolerancepublic errand limits, we are negligible it, otherwise we are about to adopt measure to eliminate it. The elimination of 3 errors method

      Method 1: When changing process designing of process designing dimension, adjust the contrail of point of a knife, make point of a knife of circular arc form actual treatment outline and ideal outline conform to. With SR10-0.04 spherical treatment is exemple, we need to make fine vehicle block following altering only when process designing can:

      Before the change After the change


      N100 G00 X0 Z50
      N105 G03 X10 Z42 R10 FO.1

      N100 G00 X0 Z50
      N105 G03 X10 Z42 R10.4 FO.1
      … method 2: It is a knife with center of circular arc of point of a knife move of dot process designing is as follows: → of scale workpiece draft is feature of contrail of center of circular arc of computation of → of contrail of motion of circular arc of basis scale point of a knife to nod → process designing with R of radius of circular arc of point of a knife and work measure. Computation of the scale in contrail of center of circular arc of the point of a knife in this process and its feature dot shows a trouble slightly, if use the coordinate that the scale function that is apart from a line and dot wait for in CAD software to inquire the function comes,complete this work, appear very convenient. Additional, when using this kind of method to machine, handlers should notice the following at 2 o’clock: Whether is the R value of the radius of circular arc of point of a knife that 1) checks an use cutting tool worth conform to with the R in the program; 2) is right when the knife, want to consider R value to go in, namely: If to the knife that the knife receives filling value is X(X axis) with Y(Z axis) , filling value is the knife that should input actually X-2r and Y-r.

    4 epilogue the article basically is beyond the treatment of arc of predestined relationship protruding is exemple undertake discussion, the dambered surface of other type, cone also is put in similar problem, the article no longer give uncecessary details.

    The typical to program of machining center

    The work out of 1. drilling program

    If pursue 1, edge random is gotten point-blank equidistant aperture. If use the vertical machining center that provides FANUC-6M system, criterion machine program is as follows:

    Graph 1 The edge drills equidistant hole point-blank

     

    O1000

    N10 G92 X400.0 Y300.0 Z320.0 builds treatment coordinate department

    N20 M06 T00 changes central getting

    N30 G90 G00 X0 Y0 X, Y to fixed position

    N40 Z0 Z to fixed position

    Main shaft of N50 M03 S500 F30 is started

    N60 G81 G99 R-4.0 Z-10.0 is gotten deeply the central aperture of 5mm

    N70 G91 G00 X20.0 Y10.0 L03 repeats 3 times drill 3 centers hole

    N80 M05 main shaft rotates stop

    N90 G28 Z0 answers machine tool origin via machining origin

    N100 M06 T01 changes bore knife, return treatment dot

    NIl0 M03 G90 G00 G44 H01 G81 G99 R-5.0 Z-30.0 drills the first hole, add cutting tool compensation

    N120 G91 X-20.0 Y-10.0 L03 repeats drill hole 3 times

    N130 M05 G28 G49 Z320.0 cancels compensation of cutting tool length answers Z axis

    N140 M01 reference point

    N150 M99 P20 returns N20 block

     

    The characteristic of the program:

    1) uses G92 to build treatment coordinate department, coordinate fastens slant buy quantity undertakes installing in the program, revise adjust more convenient.

    2) has twice change a knife automatically, use compensation of cutting tool length, reflect the function that machining center machines automatically. What the main shaft after the machine tool starts makes up is cutting tool of F 10 broach, 0 knives of knife library on how should get of the center. Because whole process uses two knives only, knife library need not turn, it is OK that place changes a knife.

    3) use center is gotten (N60 block) drill fixed position hole beforehand, make aperture location exact.

    4) use relative value dictates (N70, n120) gave out the position of aperture, fasten loop function repeats use, until drill hole entirely. L03 is repeat a time.

    5) used M01(N140) program suspension. Attention: Suspensive switch should put the program on face plate of the operation when use M01 to put through the position, such indicator light on the face plate when the program carries out M01 are lighted bright, tell handlers the program is in optional stop, can assemble and unassemble spare parts, pushbutton starts by the loop when waiting for processing job to end, the program is carried out then.

    6) program ending uses M99 P20 the method that this also is end of a kind of program, the block that it makes the process returns N20 automatically goes be being carried out then, move to stop ceaselessly.

     

    2. bores hole the work out of the program

     

    Graph 2 for bearing pedestal part drawing. Craft is: Hold clip last time in horizontal machining center, use turn over boring to secure the function such as the loop, not rotational workbench, in order to make sure coaxial spends a requirement.

    Graph 2 Bearing pedestal

     

    O1001
    N10 M06 T01
    N20 G00 G90 G55 X0 Y0 Z0
    N30 M03 S350 M08
    N40 G76 G99 Z-85.0 R-5.0 Q0.3 F40 uses F 35H9 of boring of loop of boring of essence of life aperture
    N50 M05 M09
    N60 G30 Y0 M06 T02
    N70 M03 M08
    N80 G43 H02 G00 Z0

    N90 G76 G99 Z-25.0 R-5.0 Q0.3 uses boring of essence of life on the right side of circular boring F 45H7 aperture
    N100 M05 M09
    N110 G30 G49 Y0 M06 T03
    N120 G00 G43 H03 Z0
    N130 M03 M08
    N140 G87 G99 Z-85.0 R-100.0 Q6.0 uses F 45H7 of boring of the loop that turn over boring left aperture
    N150 G49 G30 Y0
    N160 M05 M09
    N170 M30

     

    Program characteristic:

    1) uses G55 set to machine coordinate department, parameter setting is used before treatment.

    2) has G30 of the instruction that change a knife 3 times, implementation boring is different the purpose of aperture, axis of the Y when horizontal machining center changes a knife must wind reference point (N60, N110 and N150) .

    3) compensates the boring cutter that handles different length with cutting tool length, make its achieve the job to nod the position to agree.

    4) program ends use M30, make the program carries out automatic restoration to arrive program position of rest. After waiting for next spare parts to install clip to be over, start circularly by again, begin again new round treatment. To such keeping that machine circularly, the action of N150 block is divided outside eliminating cutting tool length in time to compensate, still make Y axis returns the position that change a knife, had made preparation to carry out N10 block.

    5) bores hole in essence of life in the loop, retreat a knife to allow knife movement from time to tome, handlers is when knife of knife library traditional Chinese clothes, should special attention the edge direction of boring cutter.

     

    The work out of 3. milling program

     

    Ichnography form introduces below linear the work out with circular arc machine program, graph 3 it is magnet steel tile piece mould graph, the order that processes this mould with vertical machining center is as follows:

    Graph 3 Magnet steel tile piece mould

     

    O1002
    N10 M06 (uses F 20 to establish milling cutter)
    N20 G90 G00 G54 X5.0 Y30.0
    N30 Z0
    N40 M03 S300 F30 M08
    N50 G01 G42 D1 X15.0 Y47.7 (D1=10.2)
    N60 X20.0 Y67.08
    N70 G03 X-20.0 R70.0
    N80 G01 X-15.0 Y47.7
    N90 G02 X15.0 R50.0
    N100 G01 G40 X5.0 Y30.0

    N110 G42 D2 X15.0 Y47.7
    N120 X20.0 Y67.08
    N130 G03 X-20.0 R70.0
    N140 G01 X-15.0 Y47.7
    N150 G02 X15.0 R50.0
    N160 G01 G40 X5.0 Y30.0
    N170 G00 Z100.0
    N180 M05 M09
    N190 M01
    N200 M99 P02
    Setting: D1=10.2, d2=10.

     

    Program characteristic:

    1) is same use the knife twice cutting tool radius compensates a function, realize the rough machining to the spare parts and finish machining.

    2) program can be used circularly, undertake batch is machined.

    3) radius compensates date to be D1. Radius compensates a function to want to cancel in time after give out, can produce positional deflection in other block otherwise, the function that this kind of deflection uses program restoration is obliteration not.

    If 4) introduces a subprogram to still can simplify further program.