Aperture of whorl of machining center cant machines exploration

Engine of craft difficulty Australia to maintain the versatility with Euramerican engine interface, used " the center is sold add splay draw bar " drawing structure, if the graph is shown 1 times, the drawing that there are 18 glyphs on structural frame namely, the Y that its machine plane and machine tool, Z plane is put in 10 ° included angle, the need when structural frame is machined finishs drawing the treatment of M30-6H of two groups of on 10 ° and two plane on 350 ° direction and plane 4 whorl aperture. But, drawing seat at structural frame mid, there all is bridge body interference all around, its assemble plane to reach those who assemble whorl aperture and structural frame is transverse the point of view with exist proper again with fore-and-aft center, it is the level is placed or upend is placed no matter, the mechanical bore of use convention attacks whorl method to all cannot realize its whole to machine. On the other hand, if use benchwork hand to move,attack whorl, because the bore diameter size of this whorl aperture is larger, in attacking whorl process bring about whorl aperture axes easily deflective, assure product quality hard. Be aimed at current situation of Australian engine structural frame, we decide to use machining center, the whirl that carries orthogonal accessory milling head cooperates control of numerical control system to use whorl milling means to machine this aperture. But, even if is such, this process still puts in the difficulty of the following respects: (1) manufacturing site machining center is door of dragon of two numerical control respectively system of SIEMENS numerical control and system of FANUC numerical control, relevant accessory milling head is only before this on direction of 0 ° , 90 ° , 180 ° , 270 ° had undertaken processing work, did not machine the successful experience that go up in oblique plane, accessory milling head has turned the treatment precision after proper point of view needs farther test and verify to pursue 1 　 　 (2) the synchronous changeover that how realizes head of machine tool accessory and workpiece coordinate to fasten. From the graph 1 can see, drawing transverse center line becomes plane and structural frame 10 ° included angle. In machining a process, the program that can adopt set of machine tool business realizes the dislocation of accessory head, make the central axes of cutting tool and wait for treatment plane to keep perpendicular; In process designing respect, also can pass θ of L × Sin, l × (1-cos θ ) (L is equal to accessory head and knife to grow the sum, the included angle that θ machines face and datum plane to wait for) computation gives plane and the start that aperture machines orbit and terminus nod a coordinate. But, this is confined to the countervail of coordinate have a snack to stave off hunger of linear feed. The synchronism that if cannot realize head of machine tool accessory and workpiece coordinate effectively,fastens is changed, treatment of planar to special rule mill circle, corkscrewed yarn must the coordinate compensation of feed of 3 axes linkage is very difficult, partial system takes treatment to also cannot work normally circularly oneself. (3) whorl aperture machines difficulty, as a result of drawing the axes of whorl aperture and included angle of existence of department of machine tool coordinate, and the effective deepness of aperture is deeper, achieve 60mm, it is treatment of horizontal way bore, bits of the platoon in machining a process, cooling all very difficult, the quality of whorl bottom outlet assures hard. Next, drawing whorl aperture diameter is bigger, bigger to the requirement of machining center main shaft and influence, unsuited attack whorl with machining center; Whorl milling technology also has in partial data only understand probably, not aborning has been applied actually, especially the application of the whorl milling technology on oblique plane is more scarce. 2.

Solve measure to rotate in view of new machine tool the accuracy after special rule angle is unidentified, mill whorl also was not used in formal product, must pass craft experiment test and verify its accuracy and effectiveness. Accordingly we designed following experiment processes. (1) test and verify of precision of treatment of direction of machine tool cant is shown 2 times like the graph, in system of two kinds of numerical control control falls, use machining center respectively advocate milling head treatment gives datum plane of direction of a 0 ° , use by the program next advocate the 2nd datum plane that milling head becomes 10 ° included angle with datum plane with treatment of diagonal feed means. Exchange orthogonal milling head next, one fiducial hole is drilled in 0 ° direction, next corner 10 ° , press the numerical value that has calculated, one step face is machined on the foundation of the 2nd datum plane, drill two hole. On finally 3 coordinate are measured machine detect the angle of 10 ° plane and aperture and datum plane, fiducial aperture, position, pitch, judge a machine tool to whether satisfy craft requirement in the treatment precision on oblique plane thereby. Through field test test and verify. (2) coordinate changeover test and verify should realize milling of aperture of whorl of special rule plane, must rotate workpiece coordinate department to with need the point of view with treatment same area, process designing of plane of translate into of process designing of ability general cant, simplify thereby to program, reduce computational amount. Graph 2 　 are in sea day on machining center, because the machine tool takes coordinate to rotate oneself function, accordingly we choose system of SIEMENS 840D numerical control to rotate circular CYCLE_TS (" HE3 " , 1, - 561-263.

8, 260-5, 0, 10, 0, 0, 0) workpiece coordinate the department rotates to 10 ° plane, and reach coordinate origin translation the symmetrical center of two whorl aperture, undertake linkage is machined next, experiment proof machine tool can work normally and the length of cutting tool and accessory head can be compensated correctly. To cannot realizing the machining center of system of SIEMENS 840D numerical control that coordinate changes automatically, we are chosen but process designing rotates the translation of the whirl that dictates ROT can realize workpiece coordinate to fasten likewise and coordinate origin. But can affect athletic contrail as a result of cutting tool and parameter of accessory head length nod a validity, need is each bits righter X and Y to undertake parameter is compensated respectively, it is L= in the compensation cost of feed direction among them (L1+L2) (1-cos θ ) (L1 is cutting tool length, l2 is the length of direction of accessory head feed, θ is the included angle of axes of cutting tool center and workpiece coordinate department, 90 ° of θ ≤ ) , namely final cutting tool length compensates L= (L1+L2) + (L1+L2) × (1-cos θ ) ; The length compensation of another direction is L"= (θ ) × Sin θ , compensatory direction inspects particular case and decide. To FANUCCNC Machining center, we are chosen above all rotate instruction G68, but in experimenting, we discover in G68 instruction control falls, the system is remained machining planar treatment formerly, can not rotate working plane be machined to special rule angle, cutting tool length also cannot be compensated normally, because this cannot realize the mill circle of special rule plane or bore circulates, also cannot realize whorl milling further. In other words, what G68 instruction can realize plane to rotate only and cannot undertake cylinder is stereo rotate. What the whirl that wants plane of the job that finish must realize workpiece coordinate to fasten is stereo rotate. Later, we take coordinate to rotate oneself according to the machine tool function, after use G117/G118 instruction makes workpiece coordinate department rotates, serious attempt 2 new undertake circle of mill of 3 axes linkage experiments, confirm feasible. Call a system to take treatment loop course oneself, also can move normally. So far, the synchronous changeover that head of accessory of machining center machine tool and workpiece coordinate are door of dragon of two numerical control comes true. 3.

Whorl milling test and verify because drawing treatment place is special, bore diameter is bigger, it is no matter motor-driven or it is the hand is moved attack whorl difficulty very big. Have superior exterior quality and dimension precision not only considering whorl milling, and treatment efficiency and stability are better, finished cost is low, not tall to machine tool requirement, so this second drawing M30-6H whorl aperture plans to consider to be machined with whorl milling. According to actual condition, we choose to take CYCLE90 of loop of mill whorl standard to reach oneself with SIEMENS system above all advocate milling head undertakes milling, through the experiment we discover, what CYCLE90 uses circularly is whorl of treatment of odd tine milling cutter, not only point of a knife wears away splitting, and manufacturing efficiency is low. Process designing way is changed with the hand after, convert whorl combs knife, one knife machines much tine. Can make full use of already so the many tooth of whorl milling cutter, can improve manufacturing efficiency greatly again. 3 keys of this process nod is: ① machines indirect knife of the loop twice in photograph adjacent, must calculate accurately the coordinate value of 3 direction of the dot that receive a knife, go up to be cut with linear or smaller than bottom outlet radius circular arc kind in plane of this dot that receive a knife next, cannot cut with corkscrewed yarn means, will produce random tooth phenomenon otherwise. ② machines a loop every feed deepness of a pitch, feed makes photograph neighbour between two treatment loop several times pitch. ③ must beforehand radius of corrective cutting tool is worth to the standard, ensure bore diameter not out of tolerance. Advocate after milling head test is successful, pass changeover of machine tool coordinate and coordinate translation, will advocate transplanting of program of milling of milling head whorl arrives in treatment of accessory head dislocation, can undertake whorl aperture is machined is not groovy plane. With sea day system of numerical control of machining center SIEMENS840D is exemple, divide a drawing of treatment loop milling whorl aperture, the work out is as follows machine program: The coordinate before N0040 CYCLE800; of 　 of 　 of N0030 G54 G90 of 　 of N0020 M6 　 of 　 of N0010 T1 　 cancels this changes 　 N0050 CYCLE_TS (" HE3 " , 1, - 561, - 263.

8, 260.

5, 0, 010, 0, 0, 0) ; coordinate department changes 10 ° , reach coordinate origin translation drawing N0060 D2; of symmetrical center 　 calls cutting tool compensation, need not calculate compensating parameter, the system is calculated automatically 　 ;A) N0130 G01 Z=-63 of 　 of 　 of N0120 G00 Z=20 of 　 of 　 of N0110 M03 S350 F60 of 　 of 　 of N0100 Y=0 of 　 of 　 of N0090 X=-190/2 of 　 of 　 of N0080 Z=100 of 　 of 　 of N0070 G00 Y600 of 　 of the first aperture; Use suitable mill, from hole bottom to orifice feed 　 ; 1) N0150 G03 X=-190/2+15 Y=0 Z=-63+3 of 　 of 　 of N0140 G41 G01 X=-190/2+15 Y=0 of 　 of the first knife.

5I=-15 J=0; with 　 of 　 of N0160 G40 G01 X=-190/2 Y=0 of 　 of a week of feed of a pitch; 2) N0170 G01 Z=-63+3 of 　 of the 2nd knife.

Pitch of the feed between two loops makes 5*5; photograph neighbour N0190 G03 X=-190/2+15 Y=0 Z=-63+3 of 　 of 　 of N0180 G41 X=-190/2+15 Y=0 of several times 　 .

5*5+3.

5;3 of 　 of 　 of N0200 G40 G01 X=-190/2 Y=0 of 　 of I=-15 J=0 　 ) N0210 G01 Z=-63+3 of 　 of the 3rd knife.

N0230 G03 X=-190/2+15 Y=0 Z=-63+3 of 　 of 　 of N0220 G41 X=-190/2+15 Y=0 of 5*5*2 　 　 .

5*5*2+3.

5;4 of 　 of 　 of N0240 G40 G01 X=-190/2 Y=0 of 　 of 　 of J=0 of I=-15 　 　 ) N0250 G01 Z=-63+3 of 　 of the 4th knife.

N0270 G03 X=-190/2+15 Y=0 Z=-63+3 of 　 of 　 of N0260 G41 X=-190/2+15 Y=0 of 5*5*3 　 　 .

5*5*3+3.

5N0300 CYCLE800; of 　 of 　 of N0290 G00 Z=100 of 　 of 　 of N0280 G40 G01 X=-190/2 Y=0 of 　 of 　 of J=0 of I=-15 　 　 cancels coordinate to change 　 of 　 N0310 M30 to system of FANUC numerical control, because systematic itself does not have whorl milling to machine a loop, can use a hand to use treatment of process designing means only, the machine program of whorl milling part and SIEMENS system are similar, different is coordinate rotates only part, rotate coordinate now to program is as follows: N0030 G117 C54 of 　 of N0020 M6 　 of 　 of N0010 T1 　 (the choice is waited for rotate workpiece coordinate is G54) 　 　 N0040 G118 B10 (workpiece coordinate department rotates 10 ° ) 　 　 ... N2060 G118 B0 of 　 of 　 of 　 　 N2050 G117 C54 (accessory head restoration) 　 of 　 　 N2070 M30 and SIEMENS system are different, after system of FANUC numerical control rotates in coordinate, cutting tool length and accessory head length cannot be compensated correctly, to assure the nods a coordinate validity of aperture, when special rule plane is machined, should on the offensive is moved accessory head X, Y to compensating parameter value is adjusted for " 0 " (Z to OK and correct compensation, need not change) , weave try to compensate on feed direction when the program in handiwork next, namely the Z=Z coordinate after coordinate is changed nods ± (cutting tool length + length) , symbolic direction inspects particular case and decide. 4.

Epilogue passes afore-mentioned 3 measure test and verify, realized the whorl milling of system of SIEMENS numerical control and machining center of system of FANUC numerical control completely, successful apply at drawing of Australian engine structural frame treatment. Already very good assurance product quality, reduced Australian engine drawing considerably again treatment difficulty, improved manufacturing efficiency, the successful trial-produce that is Australian engine laid solid foundation. CNC Milling CNC Machining