Use CAD constructive law to finish numerical control process designing the computation of each node

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  • source:YIGAN CNC Machining
Use AutoCAD 2000 to assist constructive and complete the computational problem that solved above existence, not only rate is rapid, and accuracy rate is high, want to ask according to blueprint only, on computer screen the picture gives place to want to machine each outline graph, outline of spare parts of manual process designing can be found out in the graph value of coordinate of each node position. When numerical control machine tool machines a spare parts, need writes CNC Machining program, the staff branch of the program is two kinds of methods, namely manual process designing and automatic process designing. Complex to appearance or spare parts of dimensional curved surface, because calculation is complex, manual process designing cannot come true, the method that uses a CAD is automatic process designing, not quite complex to appearance part or choose a treatment, use manual process designing. The data when manual process designing is calculated, always the dimension of contrail of treatment of computer spare parts (calculate namely contrail of the coordinate of the base point of spare parts outline and node or cutting tool center) , on treatment blueprint base point and coordinate do not have line out or complete without mark, this needs consideration. Some computation are very trival, need spreads out according to analytic geometry or see group of a few simultaneous equations, need to take up many time, and be in solution problem process appear easily mistake. Use AutoCAD 2000 to assist constructive and complete the computational problem that solved above existence, not only rate is rapid, and accuracy rate is high, want to ask according to blueprint only, on computer screen the picture gives place to want to machine each outline graph, outline of spare parts of manual process designing can be found out in the graph value of coordinate of each node position. A whole process that introduces manual process designing is with attached drawing below. The measure with constructive 1 CAD asks according to blueprint above all the place of CNC Machining, set workpiece coordinate is, use a mouse to click CAD icon to enter CAD interface, click tool command next, choosing user coordinate is the G source below subdirectory, in screen random the position clicks mouse Zun Jian, at this moment workpiece coordinate department is decided, later in place draw each dimension spreads out around department of this one coordinate. Click linear command to cross central line, with workpiece coordinate department origin O is the centre of a circle, make two circles of R51 and R36 respectively. With coordinate linear law makes the first quadrant pass an imperial examination of line of branch of 45 ° horn 120 ° horn divides 2 quadrant line, with workpiece coordinate the department is the centre of a circle, r36+R15 makes a circle for radius, intersect to distribute a line at 45 ° and 180 ° horn at 2 o'clock, was the centre of a circle at 2 o'clock with this respectively, r15 makes a circle for radius, part tangent at R36 2, 9 at 2 o'clock. Use in the first quadrant catch a method to find R15 upper part 45 ° role is linear and tangential the position 3 make this linear, command of TTR of input of choice picture round order, mobile mouse is mixed to R51 respectively 45 ° are linear go up and click mouse Zun Jian, r5 and R51 and 45 ° role are linear and tangential, carriage return of input radius R5 affirms, dot 4, 5 be decided. Mobile command is clicked on the 2nd quadrant, the choice is line of branch of 120 ° horn, mobile this is linear, use the method that takes point of contact, mobile and linear as tangent as R15, such was decided at 8 o'clock. Attached drawing chooses round order again, input TTR command, mobile mouse arrives to R51 and 120 ° horn divide a line to go up and decide respectively, input radius R10, carriage return, such R10 and dot of tangent position of lines of 120 ° horn branch and R51 6, 7 be decided. Click clipping command, choose total figure, click mouse Zun Jian to decide, ordinal in cutting off a graph spare part, so whole graph is made entirely. 2 in searching a graph, position of coordinate of each point of tangency is below Command command, mobile mouse reachs each to go up point-blank to each circular arc, click mouse Zun Jian, in pursueing at this moment, position of each point of tangency is shown come, ordinal and mobile mouse arrives position of each point of tangency, this bits of coordinate is being shown below screen at this moment is value of the X below, Y, note costs of next coordinate of each point of tangency on note, use as process designing place. 3 find out coordinate of center of each circular arc to click linear command, choice to catch the centre of a circle to command, mobile mouse wants affirmatory circular arc to go up to place, the centre of a circle of this circular arc is shown on screen at this moment, click Zun Jian, mobile mouse to arrive another position, click Zun Jian and right key, choice to catch steep end points to command again, mobile mouse arrives position of end points of each the centre of a circle, coordinate of next the centre of a circle are written down to be used for process designing place on note, coordinate of other the centre of a circle decides by same method. Process designing of ⑷ numerical control decides cutting tool radius first, set feed dot, cutting tool slants buy point, course taking a knife reachs the point that retreat a knife, this course taking a knife is K, K ' , 1, 2, 3, 4, 5, 6, 7, 8, 9, dot of I, K" , cutting tool moves to be nodded to K above all, in K dot the knife that finish slants and fall knife, in K" the dot carries the knife cancels a knife to slant. Numerical control process designing is as follows: Motion of N2 G90 G00 G54 X0 Y0 Z0 N4 M03 S300 N6 X36 Y-50(k) finishs a knife to slant to K dot N8 G42 Y-10H01 (k) dot N10 G91 G01Z-50 Fq50 falls the knife nods N12 G90 G01 X35 Y0(1) N14 G03 X25.

455Y25.

455-35J0(2) N16 G02X21.

062Y36.

062I-15 J-15(3) N18 G01 X21.

062T43.

064(4) N20 G03 X17.

808Y47.

879I-5 J0(5) N22 X-43.

185Y27.

221-17.

808J47.

104(6) N24 X-43.

381Y16.

804I8.

468J-5.

031(7) N26 G01 X-38.

009Y7.

5(8) N28 G02 X-36 Y0(9) N30 G03 X36 Y0(1) N32 G01 Y30(K") carries the knife nods N34 G28 Z0 N36 G00G40 N38 G28 X0 Y0 N40 M02 CNC Milling CNC Machining