Two example that numerical control machine tool machines

Summary: The exemple in article 1 in explaining to be machined in a few specific work, use CT and RND instruction have one this advantage of process designing; Exemple 2, guide through machining sector board the specification handles the process designing means that uses when circular arc of many line segment and linear connective cell body and radius compensation in CNC Machining all sorts of instructions in means article and program apply to pilot of system of Xi Menzi 810D/840D boring mill class number. Keyword: Polar coordinates of G2 G3 CT RND; Cutting tool compensates radius; Boundary line of central line boundary. One, statements of two kinds of special circular arc process designing: The instruction of circular arc process designing with CT and commonly used RND is G2 and G3, when using, must enroll circular arc radius or coordinate of circular arc start, terminal coordinate, center coordinate, can handle the circular arc process designing of all sorts of types. The CT in system of Xi Menzi 810D/840D and RND instruction also can generate accurate circular arc contrail, appear in machining outline with circular arc and other and linear or circular arc is tangent when connective contrail, apply CT and RND instruction neatly to undertake circular arc process designing compares use G2 and G3 instruction to go to the lavatory more: 1.

The circular arc of inflection point of outline of RND instruction processing transfers the meaning that RND dictates: Place of outline inflection point transfers with the circular arc that appoints radius processing, and mix relevant linear or circular arc is tangent join, numerical control system is automatic operation the coordinate of each point of tangency. Consult graph 1 treatment content is the others outline outside hemline, place is as follows with the program. The circular arc that the form that RND=5 uses in program of N005 G54 G90 G0 Z100 T1 D1 N010 X70 Y50 N015 M03 S1000 F500 Z10 N020 G41 Y20 N025 G1 Y70 RND=5 N030 G1 X40 RND=5 N035 G3 X0 CR=20 RND=5 N040 G3 X40 CR=20 RND=5 N045 G1 X70 RND=5 N050 G1 Y30 N055 M30 expresses to place of outline inflection point uses radius R5 transfers processing, and with relevant linear or circular arc is tangent join, numerical control system is automatic operation the coordinate of each point of tangency, do not need to write the coordinate of point of tangency in the program. And write with G2 and G3 instruction everywhere R5 round brilliant must be calculated the coordinate of each point of tangency (nod 10 times in all) , much still 5 programs. Nextpage 2.

CT instruction finishs the meaning that dictates with circular arc or circular arc and CT of round tangent join point-blank is: The end dot P1 that passes one Duan Zhi line or circular arc appoints bit of P2 to generate a paragraph of circular arc with another and and in front linear or circular arc is nodded in P1 place is tangent, numerical control system is automatic instruction of CT of radius of operation circular arc is mode. Consult graph 2 treatment content is the others outline outside hemline, place is as follows with the program N005 G54 G90 G0 Z100 T1 D1 N010 X90 Y120 N015 M03 S1000 F500Z10 N020 G41Y100 N025 G1 Y20 N030 X60 N040 Y0 N045 CT X20 (circular arc of the first R20) N050 X20 (circular arc of the 2nd R20) N055 X60 (circular arc of the 3rd R20) N060 G1 Y20 N065 G1 X90 N070 Y100 N075 M30 is with CT when work out program need to input coordinate of point of tangency only and need not write circular arc radius, also need not judge the direction of circular arc, in mix point-blank circular arc or multistage circular arc is used when process designing of tangent connective outline very convenient. 3.

CT and RND dictate the 2045 application in polar coordinates department are in polar coordinates department with G2 and G3 instruction process designing is restricted from time to tome, the utmost must set is in a center of process designing circular arc. And overcame this one obstacle well with CT and RND instruction. (1)RND instruction fastens medium application in polar coordinates. Consult graph the 3 V that machine 4 30 ° on CNC Milling chamfer, be as follows for exemple program with the V of 90 ° position chamfer. Instruction of N005 G54 G90 G0 T1 D1 Z100 N010 G111 X0 Y0 N015 AP=9015 RP=110 N020 M03 S1000 F500 Z10 N025 G42 RP=100 N030 G1 RP=0 RND=10 N035 G1 RP=100 N040 M30nextpage (2) CT fastens medium application in polar coordinates. Consult graph 3 paragraphs of circular arc of 4 treatment upside and place of 2 paragraphs of linear and tangent connective, the program is as follows. N005 G54 G90 G0 Z100 T1 D1 N010 G111 X0 Y0 N015 AP=903618 RP=150 N020 M03 S1000 F500 Z10 N025 G42 RP=130 N030 G1 RP=142.

66/2 N035 CT AP=9018 N040 AP=90+18N045 AP=90+18+36 N050 G1 RP=150 N055 M30 pursues 3 with the graph the workpiece treatment place of these two kinds of 4 types uses arithmetical coordinate to fasten process designing data processing to be bothered quite, the pole when G2 and circular arc of G3 instruction process designing is used in polar coordinates department must the center that set makes up circular arc in place, need work of a few computation, and when use RND and circular arc of CT instruction process designing, the utmost need not the center that set makes up circular arc in place, the utmost is OK set is in the position of aleatoric convenient data processing. Graph 3 with the graph the workpiece of these two kinds of 4 types machines place to use polar coordinates when process designing and the utmost set goes to the lavatory most in work center. 2, method of compensation of special cutting tool is machining sector paragraph guide board medium application 1. Method of common cutting tool compensation consults graph 5, on CNC Milling the 40mm that use φ establishs milling cutter to machine the chamfer of 60H7, undertake process designing according to the borderline side groove, use program is as follows. Want to pass rough machining, semifinishing machining and finish machining to run a program 3 times in effective treatment of N005 G54 G90 G0 Z100 T1 D1 N010 X150 Y0 N020 M03 S300 F100 Z30 N025 G42 Y30 N030 G1 X150 N035 Y30 N040 X150 N050 M30, corresponding radius compensates a value first big hind small it is 22mm respectively, 20.

5mm, 20mm (theoretical value, after final radius compensates a value to want a course to be measured actually, decide) . 2. Method of special cutting tool compensation consults graph 5, on CNC Milling the 40mm that use φ establishs milling cutter to machine the chamfer of 60H7, undertake process designing according to central line, use program is as follows. Want to pass rough machining, semifinishing machining and finish machining to run a program 3 times in effective treatment of N005 G54 G90 G0 Z100 T1 D1 N010 X150 Y0 N020 M03 S300 F100 Z30 N025 G42 X140 N030 G1 X150 N035 G0 Z100 N040 G40 X150 N050 Z30 N055 G41 X140 N060 G1 X150 N065 G0 Z100 N070 M30, corresponding radius compensates a value first small hind it is 8mm respectively greatly, 9.

5mm, 10mm (theoretical value, after final radius compensates a value to want a course to be measured actually, decide) , the 2 cutting tool of width ／ that final radius compensation is worth ＝ chamfer theoretically radius. Activation twice with G41 and G42 respectively in the program the knife fills, increased idle stroke, when means of compensatory of radius of this kind of use cutting tool is processing the work of general kind, appear very troublesome, but this kind of method is used to be able to make process designing job becomes very simple when the work that processes specific type. Nextpage 3. Machining sector paragraph guide board in the medium treatment that uses in a few more special cell body, the shape size of groovy width, deepness and central line is tagged only in blueprint, be aimed at the workpiece of this one type, undertake process designing according to central line, the cutting tool with the special application in treatment compensates a method. Consult graph 6, this is me the sector that company laminose plant uses in Lian Zhu equipment paragraph guide board, it is sector paragraph guide the crucial part into device. Machine 44mm of 7 128 × to guide with milling machine of file of TK6920 numerical control groove. 7 of this workpiece guide groove is by multistage circular arc and linear and tangent join are formed, the shape size of groovy width, deepness and central line was tagged only in blueprint, above ministry guides groove is the cutting tool with a special specification to compensate use method the first times, undertake process designing according to central line. Program name: CAO1 program content: N5 G54 G90 G64 G0 W0 Z150 T1 D1 (call number of the first knife) ＝ of N10 G111 X0 Y0 N15 X 1804 - 100 Y=464.

424N20 M04 S250 F200 Z - 44 N25 G41 X=IC (50) (activation knife fills begin those who machine cell body to go up attrib border) ＝ of N30 G1 X 1804+920.

617N35 CT AP=9016.

03RP=1499.

5N40 G1 AP=9016.

03RP=1499.

5+ 100 N45 G0 G40 X=IC (100) Z150 N50 X=1804 - 100 Y=464.

424T1 D2 (call number of the 2nd knife) N55 G42 X =IC (50) (activation knife fills the below circle that begins to machine cell body) ＝ of N60 G1 X 1804+920.

617N65 CT AP=9016.

03RP=1499.

5N70 G1 AP=9016.

03RP=1499.

5+100 N75 G0 G40 X=IC (100) the width of chamfer of Z150 N80 M30 and central line asymmetry, two knives name was used in the program, machine cell body above D1 is used when the bound, the below that machines cell body uses D2 when the bound, in be being machined actually, with φ 50mm milling cutter wants to pass rough machining, semifinishing machining and finish machining to run a program 3 times, corresponding radius compensates a value first small hind it is D1=10mm respectively greatly, 12mm, 12.

5mm; D2=13mm, 15 Mm, 15.

5mm. If use common cutting tool to compensate use method, undertake process designing according to the borderline side groove, be about to calculate the coordinate of each paragraphs of circular arc in the borderline side groove and linear point of tangency and each paragraphs of radius of circular arc, computational quantity is very big. And undertake process designing can use the measure that tags on blueprint directly according to central line, shunned many, trival data computation job, the place in assuring a program uses the accuracy of data, huge improved process designing efficiency. Its method has two characteristics: (1) undertakes process designing according to central line and not be according to true treatment attrib border line undertakes process designing. (2) cutting tool compensates a value to be increased gradually according to the order of rough machining, semifinishing machining and finish machining, the border that academic compensation is worth 2 treatment reachs a center the distance of the line radius of one cutting tool. The advantage is to use the dimension that tags on blueprint to undertake process designing directly, the place in assuring a program uses the accuracy of data, do not need to undertake a large number of trival data computation work. CNC Milling