The research that tune of boring machine of mill of table of numerical control dig bores hole

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  • source:KAIHER CNC Machining
The structural characteristic of boring machine of mill of 1 dig table fastens the long aperture boring that is a delegate with aperture of coaxial of casing spare parts, it is one of the most serious content in metallic cutting treatment. Although still have now use rear column of boring machine of mill of boring model, guide-post bushing, table to bearing grows boring lever or search artificially the method such as 180 ° carries out workpiece circumgyrate the example of long aperture boring, but some closer year come, use in great quantities as a result of boring machine of numerical control mill and machining center on one hand, make the coordinate of boring machine of mill of of all kinds horizontal locates precision and precision of workbench circumgyrate graduation had bigger rise, long aperture boring gradually by efficient workbench circumgyrate 180 ° bore hole from the tune of fixed position (graph 1) place is replaced; On the other hand, of layout of form lathe bed common or of boring machine of mill of table of numerical control dig mass-produced with application, make from machine tool structure workbench circumgyrate 180 ° bore hole from the tune of fixed position, become the only method that grows aperture in the boring on this kinds of machine tool almost. Graph 1 workbench turns 180 ° bore hole from the tune of fixed position boring machine of dig table mill and table mill boring machine are in respect of cutting tool system, the orgnaization that moves to its from the function does not have different, the X that both distinction basically is forming profile of of all kinds workpiece, Y, Z, W and B5 the X in coordinate feed motion and W on the structural composition that two coordinate move. Boring machine of dig table mill is in two structures of the position of institute of part of horizontal lathe bed of form (horizontal lathe bed, slide carriage, circumgyrate workbench) workbench, finish X(horizontal stroke respectively with the three-layer structure workbench of table mill boring machine) to, W(even if) to turn with B(stage) to 3 coordinate motion differs, finish X only to move to two coordinate with B, w moves to come true by the shift of part of vertical lathe bed of the pillar edge form that records main shaft case to coordinate. Its coordinate fastens if the graph is shown 2 times,form. Apparent, when boring hole on boring machine of dig table mill, the cutting tool motion relative to workpiece (contain advocate motion and feed motion) carry out all be cutting tool, workpiece is fixed immobile. Complete the exercise of boring cutter feed among them, when one can going up to determine the position on fore-and-aft lathe bed in pillar solid, the boring axis that moves continuously by edge Z axis comes true, also can have an affirmatory and stretchy value in boring axis later, the pillar that moves continuously by edge W axis comes true. Graph the coaxial that the coaxial that the coordinate of boring machine of mill of 2 dig table fastens 2 pillar to send into tune to bore hole spends an error to reach its to compensate pillar to send into tune to bore hole spends error D3 to affect tune of boring machine of dig table mill to bore hole the main factor that coaxial spends and table mill boring machine are same, also be the graduation error Da of 180 ° tune mixes workbench circumgyrate to make before tune already axes of D1 of half when boring becomes long aperture, after tune again the D2 of aperture of other in part of with coincide of boring axis axes boring long aperture, what need workbench horizontal stroke (X) pursues to mobile Lx=2lx(the Dx2 of fixed position error of 1) . And workbench circumgyrate 180 ° around, the obliquitous error Df that mesa produces inside Xy coordinate plane, the obliquitous error Dy that arises inside Yz plane and in Y the translation error Dy to generation, it is tune of boring machine of dig table mill bores hole as much the main influencing factor that coaxial spends. But head of exchange of position of space of boring axis axes bores hole the influence that coaxial spends, send the aperture that finish the boring machine of dig table mill of full-length boring with pillar normally, with what even if move,send with workbench normally mill boring machine has table to differ apparently. If follow the stage heart on table mill boring machine even if (or horizontal) move line definition is, high point waits with axes be boringed hole on workbench axes, be in workbench even if (or horizontal) the athletic contrail when moving, and the centre of turning circle that gets on boring machine of dig table mill to wait for point of a knife of the boring cutter on tall boring axis axes with axes be boringed hole nods O1, in the athletic contrail when coordinate of pillar edge W moves continuously, even if move,the definition is pillar line, criterion pillar sends into the boring machine of dig table mill that bore hole, no matter be bored hole even if nominal axes and pillar move the line is parallel still intersects (the case of both coincide is few) , those who hold the boring cutter head on boring axis arbor send into orbit, namely actual place boring becomes boring tool the axes of aperture, in not plan pillar moves continuously below the condition that linearity error and boring lever send the overhang that cause the error, dou Yingping goes at W coordinate axes. Accordingly, this kind of tune that sends into the form bores hole, half and half of boring of tune around place the linearity error that aperture D1 and D2 itself do not have axes, entire hole grows whether coaxial key, two spool thread that see D1 and D2 opening whether coincide is linear. And two aperture of D1 and D2 axes whether coincide, whether is main decision just at the O1 of centre of turning circle of boring cutter point of a knife over the nominal axes that is bored hole. If the centre of turning circle of point of a knife nods O1, just be located in over the nominal axes that is bored hole, make clear even if pillar moves line and coincide of axes of name be boringed hole. At this moment, remove boring dot twice of D1 of tune around boring and D2 aperture to be over aperture name axes, sending distance is axes of pillar edge W is same paragraph, coincide of two aperture axes is reason D1 and D2 one linear, spend an error without coaxial. If the centre of turning circle of point of a knife nods O1 to not was on aperture axes, and along deviate of Y coordinate direction a line is worth error Dy3, criterion although tune around parts boring D1 and D2 two paragraphs of Kong Shi, two dot removing boring is not over axes of name be boringed hole, but because of these two dot removing boring still is same point, and two send into distance to also be wait up in Y tall same paragraph, the axes of two aperture of reason D1 and D2 still coincide is same linear, also spend an error without coaxial. Did not go up in aperture axes when the O1 of centre of turning circle of point of a knife, and when along deviate of X coordinate direction a line is worth error Dx3, the circumstance that its tune bores hole, if pursue,3 are shown. Can see, two axes of the partial D1 of growing aperture of boring of tune around place and D2 aperture, list respectively in axes of name be boringed hole two side, the distance of each axes that be the same as aperture is Dx3, the coaxial that causes a boring to grow aperture thereby spends error D3. The concept that coaxial spends the basis has D3=4dx3=4ltgdb ′ (′ of the Db in 1) type -- even if axes of name be boringed hole and pillar move the L of error of angle of cut that the line intersects -- the distance of dot of centre of turning circle of point of a knife to afore-mentioned two lines node if even if pillar moves the line is the same as axes of name be boringed hole not, however parallel, and when span also is Dx3, criterion the result that the line with graphic representation intersects to hand in ′ of horny error Db is same. 1.

The stage of boring D1 Kong Shi 2.

The stage of boring D2 Kong Shi 3.

The nominal axes that is bored hole 4.

Even if pillar moves the line pursues boring machine pillar sends mill of 3 dig table to bore hole this coaxial spends the affirmatory   of Dx3 of D3 compensation cost the error is the error that decide a value, can be over in boring circumgyrate of D1 aperture workbench 180 ° and after sideslip Lx=2lx, be worth Dx3 and its direction according to affirmatory already compensation, again this Dx3 value can eliminate sideslip workbench this coaxial spends an error. By the graph 3 if be bored hole,can see Dx3=2dx3(2)   nominal axes has lain fitly the YW coordinate of workbench axes is planar (vertical vertical plane) in, criterion tune bores hole after tune but need not again sideslip 2lx distance, can eliminate D3 already so this coaxial spends an error, the head of exchange of Dx2 of fixed position error that still can remove sideslip 2lx bores hole coaxial spends an influence. From this, can reach already placed solid to fall at the premise of logical place on workbench in contented workpiece, workbench of boring machine of dig table mill is in the position of optimal clip firm on lathe bed of its horizontal stroke, it is a workbench centre of turning circle dot park is bored hole even if nominal axes and pillar move the nodical place of the line. Because be machined,when axes of name be boringed hole the reason of spare parts structure just cannot cross workbench centre of turning circle when, workbench is in the logical place on horizontal lathe bed, should be sideslip goes to a workbench make the centre of turning circle of boring cutter point of a knife nods O1, just be located in over the nominal axes that workpiece is bored hole. The pillar when 3 boring axis sends is fore-and-aft the affirmatory   of fore-and-aft and optimal position should encounter reasonable and affirmatory pillar of the position specific situation, boring machine of dig table mill must secure pillar in a on fore-and-aft lathe bed proper place, and the axis that use boring is taking cutting tool to extend when sending into the form as what bore hole, boring axis axes and axes of name be boringed hole are in the Db of error of angle of cut inside Xz plane, in the Dg of error of angle of cut inside Yz plane, like table mill boring machine, the coaxial that bores hole to tune spends the effect with have main, and send into the addition of length as boring axis, boring axis is self-prossessed flinch below the boring lever that cause be out of shape, the coaxial that also bores hole to tune spends generation bigger impact. What differ with place of table mill boring machine is, the boring axis of boring machine of dig table mill is extended when boring hole, but the pillar of fore-and-aft shift must originally the position that buy determines in on vertical lathe bed one, and important is this decides the position is OK and should be chosen. Press design regulation, z of boring axis edge to mobile distance should parallel Yu Lizhu the mobile distance of edge W axis; The nominal axes that when boring hole, is bored hole should be put in as parallel as W(z) axis position. The workbench before boring hole already moved to make axes of name be boringed hole aims boring axis along X coordinate, secure clamp, boring axis is retractile already to null, in installing the arbor that places boring cutter to insert aperture of boring axis inner cone (graph 4) . There is Db of error of angle of cut inside Xz plane when axes of name be boringed hole and boring axis axes when existence, because O of two lines node is in as pillar lathe bed even if on slideway even if move also even if move,along pillar at the same time the line moves, make pursue 4 in the numeric and corresponding change of L ′ , and Db of two lines angle of cut keeps changeless, reason no matter pillar moves to be secured to which position, the tune that brings about by Db bores hole the computation that coaxial spends error D4 is formulary, can express to be D4=2dx4=4(lW+l ′ ) the Dx4 in Tgdb(3) type -- the D1 after the tune that horny error Db causes bores hole is worth error LW to the line to the X of D2 aperture axes -- the end panel before be being bored hole arrives of workbench centre of turning circle be apart from L ′ -- the boring since Kong Duan is nodded. L ′ is worth but can losing, when O dot is located in M to burn inside, l ′ value is negative, the side outside be located in (graphic representation position) when, l ′ is apparent, d4 can be before boring D2 aperture, move through X Xiang Wei workbench, get compensating. Its compensate a value to be Dx4=dx4=2(lW+l ′ ) Tgdb(4) pursues 4 boring axis sends into bore hole type (3) makes clear, below the circumstance that exists in Db, eliminate D4 fill wanting a condition is LW+l ′ =0. From the graph 4 in can see, already was in by boring long aperture in workpiece logical place (line of stage heart sideslip deuces aperture is full-length) below premise, be about to satisfy =0 of equality LW+l ′ to hold water, can be boring axis axes and the nodical O of axes be boringed hole only, just be located in on line of sideslip of workbench centre of turning circle. As a result of O of afore-mentioned two lines node as even if pillar moves and even if edge pillar is mobile, so =0 of ′ of conditional type LW+l always can hold water. This that is to say, when boring axis sends boring machine of dig table mill to bore hole, to make D4 the smallest, pillar places the optimal position of solid on vertical lathe bed, should be to make the nodical O of boring axis axes and aperture name axes, on the line of sideslip of centre of turning circle that just is located in workbench. Of horny error Db and nodical O determine   by afore-mentioned knowing, get pillar the optimal position that place firm and accurate compensatory premise, it is foregone Db and nodical O the position on boring axis axes, this can use actual measurement to beg, measure a law to be as follows. workbench park transverse intermediate position, on mesa transverse put one smooth foot, slant in smooth feet the some side upside of workbench centre of turning circle puts one gauge block (graph 5) . Pillar stops in a classics to try measure proper place, on axis of boring of park of dial gauge solid, watch head is touched on K of face of gauge block inside, take A1 of dial gauge reading, boring axis and workbench turn each 180 ° (set all do not have graduation error) , make express a head to still be touched on former flank K to take reading B1, serve as datum line with boring axis axes (O1 ~ O1) , even if move,decide pillar from this on-line a bit Q1. Q1 is LQ1=(A1-B1)/2 to the distance of boring axis axes. Must notice to even if move,express pillar the sign of the LQ1 that dot of the Q1 on the line is located in which a side of boring axis axes. Even if move pillar LW2 distance, boring axis is corresponding also extension forward or regressive LW2, repeat the measurement in front to get LQ2=(A2-B2)/2, decide Q2 is nodded thereby. Join Q1 and Q2, get even if move,expression pillar the linear Q1Q2 of the line, constructive the 5b that be like a graph, even if move,can measure axes of the axis that get boring and pillar directly thereby the Db of angle of cut of the line and its node O arrive the distance value of face of front of main shaft box. If measure,get A1=B1, criterion LQ1=0, even if move,make clear this pillar on-line dot is located in on main shaft axes; If be measured again,get A2=B2, make clear afore-mentioned two lines coincide; If calculate,get LQ1=lQ2, criterion afore-mentioned two lines are parallel, be like LQ1 ≠ LQ2, criterion two lines intersect, db of angle of cut also can use value of the LW2 in type of next Tgdb=(lQ2-lQ1)/lW2(5) of type cipher out, can connect indicated value of overwriting W coordinate to get. Graph 5 measure nodical O and Db nodical O in the adjustment of the position on boring axis axes   passes actual measurement place to even if move,get boring axis axes and pillar line (be bored hole namely nominal axes) the position of nodical O, send into to boring axis bore hole for, the likelihood cannot realize the condition of LW+l ′ =0 at all. For example, if nodical O is handed in in the axes part at the back of the bearing before boring axis, criterion pillar although reach arrives before fore-and-aft ultimate position, make nodical O just is located in on line of sideslip of workbench centre of turning circle impossibly also this one logical place. From this knowable, the logical place that should make pillar fore-and-aft can come true and do not come to nothing, the workpiece a side that still must ensure nodical O wants to hand in the bearing before boring axis specificly, and the specific seat that seeks a nodical O that assures LW+l ′ =0. After deciding when arbor, the distance of the bearing before centre of turning circle of point of a knife comes is knowable, the particular value of the logical place of nodical O is gotten not hard. The position that because the size of Db and nodical O are specific,goes up in boring axis axes, it is by main shaft box installation is on pillar and when solid installs pillar to go up at slide carriage, their relative position precision decides, reason gets nodical O to should be after the proper place on boring axis axes, need to assemble the position or adjust pillar on perpendicular slideway in pillar through adjusting main shaft box the position relative to its slide carriage (make pillar circles Y axis small on slide carriage turn a horn is worth) , achieve contented and nodical O to have the demand of proper place. Of position of the cutting tool on boring machine of mill of 4 dig table reasonable and affirmatory when pillar is used to send into tune to bore hole on boring machine of dig table mill, pack the boring tool on the arbor that is placed in boring axis, its edge Z to logical place, the distance of the end panel before wanting to satisfy centre of turning circle of point of a knife to main shaft box on one hand is more than the half with full-length aperture a bit (again young general cannot connect long aperture boring, stiffness of axis of too big boring drops) ; Satisfy the centre of turning circle of a cutting tool point of a knife even on the other hand, even if axes of park boring axis and pillar move on the nodical O of the line. CNC Milling