The numerical control milling of whorl is machined

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1, the thread machining method of foreword 　 tradition basically is use turning of whorl lathe tool whorl or use handiwork of tap, front tooth tap and set buckle. As the development of CNC Machining technology, especially the occurrence of system of CNC Machining of 3 axes linkage, make more advanced thread machining means -- , the numerical control milling of whorl is able to come true. Whorl milling treatment and photograph of means of traditional thread machining are compared, in treatment respect of efficiency of precision, treatment has great advantage, and whorl structure and whorl do not suffer to come back when treatment to limitation, can machine a variety of differring to come back like milling cutter of a whorl to inside, outside whorl. To not the whorl that be patient of transfers to buckle or cancel knife chamfer construction, the turning method that uses a convention or tap, front tooth is machined very hard, but use numerical control milling to come true very easily however. In addition, the durability of whorl milling cutter is tap more than 10 times count even decuple, and in process of whorl of numerical control milling, very convenient to the adjustment of whorl diameter dimension, this uses tap, front tooth to be accomplished hard. As a result of a lot of advantage that whorl milling machines, at present the big batch whorl of the developed country is produced already relatively used milling technology widely. 2, the milling that graph of example of whorl milling treatment shows the thread inside the standard that it is M6 1 times machines example. Workpiece material: Aluminium alloy; Cutting tool: Hard alloy whorl gets milling cutter; Whorl deepness: 10mm; Milling cutter rotate speed: 2, 000r/min; Cutting speed: 314m/min; Auger cut feed: 0.

25mm/min; Milling feed: 0.

06mm/ tine; Handling time: Every aperture 1.

8s. The graph shows working station flow 1 times to be: ① , whorl gets milling cutter to move to workpiece safety plane quickly; ② , whorl gets milling cutter getting to cut to hole depth dimension; ③ , whorl gets milling cutter to promote whorl deepness dimension quickly; ④ , whorl getting milling cutter cuts whorl with circular arc initial drop; ⑤ , whorl gets milling cutter to circle whorl axes to make motion of interpolation of direction of X, Y, make parallel at the same time at axes + Z direction moves, namely every circle whorl axes to run 360 ° , along + Z just rises a pitch up, 3 axes linkage runs orbit to be one corkscrewed yarn; ⑥ , whorl gets milling cutter with circular arc from initial drop (also be knot spot) retreat a knife; ⑦ , whorl gets milling cutter to be retreated quickly to workpiece safety plane, preparation machines below one aperture. This treatment process included drill, horn, inside milling of chamfer of clear root of whorl milling and whorl, use a cutting tool to finish, treatment efficiency is extremely tall. 3, main type is in whorl milling cutter in whorl milling treatment, machine tool of numerical control of 3 axes linkage and whorl milling cutting tool are essential two element. Introduce types of a few kinds of common whorl milling cutter below: (1) the appearance of milling cutter of columnar whorl of 　 of columnar whorl milling cutter very resembling is the combinative system that cylinder establishs milling cutter and whorl tap (see a picture 2 on, pursue 2 times for) of milling cutter of taper pipe thread, but its whorl cutting blade and tap are different, cheng rises without helix on cutting tool, the helix in treatment rises Cheng to rely on implementation of machine tool motion. As a result of this kind of special structure, make this cutting tool can machine dextral whorl already, also can machine left whorl coming back, but the treatment that does not apply to bigger pitch whorl. Milling cutter can divide commonly used columnar whorl to be mixed for thick tooth whorl fine tooth whorl two kinds. Stem from pair of considerations that machine efficiency and durability, whorl milling cutter uses hard alloy material to make mostly, can besmear all sorts of Fu coating need with getting used to the treatment of special material. Columnar whorl milling cutter is applied to steel, cast-iron with nonferrous metal material in milling of small diameter whorl, cutting is smooth, durability is tall. Defect is cutting tool production cost is higher, the structure is complex, the price is high. (2) milling cutter of machine clip whorl and bit graph milling cutter of whorl of clip of 3 　 machine applies to bigger diameter (the thread machining that is like D>25mm) . Its characteristic is bit is made easily, the value is inferior, some whorl razor blade but double-faced cutting, but anti-impact properties relatively integral whorl milling cutter is a bit poor. Accordingly, this cutting tool often is recommended use at processing aluminium alloy data. The graph is shown 3 times for two kinds of machine clip whorl milling cutter reachs bit. Graph 3a is milling cutter of whorl of machine clip odd blade and triangle double-edged razor blade, graph 3b is milling cutter of whorl of machine clip double blade and rectangular and double-edged razor blade. (3) combined-type multitask multitask of combined-type of 　 of milling cutter of special whorl boring the characteristic of milling cutter of special whorl boring is one knife much blade, finish multitask treatment, can save change the auxiliary time such as the knife, improve productivity significantly. The graph is shown 4 times for combined-type multitask milling cutter of special whorl boring machines example. Workpiece needs the whorl inside treatment, pour horn and platform D4. If employ single worker worker change knife means treatment automatically, odd 30s is made an appointment with when treatment is used. And use combined-type multitask treatment of milling cutter of special whorl boring, odd 5s is made an appointment with only when treatment is used. 4, contrail of motion of milling of whorl of whorl milling contrail is one corkscrewed yarn, the 3 axes linkage that can pass numerical control machine tool will come true. Graph the milling motion sketch map of the 5 whorl outside be Zun Xuan and dextrorotation. Like the numerical control milling of general outline, 1/4 also can be used to circular arc is cut or be cut point-blank when whorl milling begins feed. Bit width should be chosen to be more than as far as possible when milling by the milling cutter of treatment whorl length, such, milling cutter needs to rotate only 360 ° can finish thread machining. If the graph is shown 6 times,the contrail of whorl milling cutter is analysed. 5, whorl milling process designing combines M30 × now 1.

Milling of the whorl inside 5 dextrorotation machines example to show the process designing method of whorl milling. Workpiece material: 42CrMo4; Diameter of whorl bottom outlet: Di=28.

38mm; Whorl diameter: Do=30mm; Whorl length L=20mm; Pitch: P=1.

5mm; Diameter of milling cutter of machine clip whorl: D2=19mm; Milling means: Arrange mill. (N of rotate speed of main shaft of 1) parameter computation is × of × 150/(19 of N=1000V/(D2 × P=1000 3.

14)=2512r/min mill tooth counts Z=1, f=0 of every tine feed.

1mm, blade of milling cutter cutting is in feed speed F1 to be F1=fz × N=0.

1 × of 1 × 2512=251.

F2 of speed of feed of center of 2mm/min milling cutter is F2=F1(D0-D2)/D0=251.

2 × (30-19)/30=92.

1mm/min sets safety to be apart from CL=0.

5mm, cut Re of circular arc radius to be Re=[(Ri-CL)²+R0²]/(2R0)=[(14.

19-0.

5)²+15²]/(2 × 15)=13.

747mm cuts B of circular arc angle to be B=180 ° - Arcsin[(Ri-CL)/Re]=180 ° - Arcsin[(14.

19-0.

5)/13.

747]=95.

22 ° are facilitating computation, can take a value to be 90 ° approximately. The α of Z of Z axis displacement when cutting circular arc is α of Z α =P / 360 ° =1.

90 ° of 5 × / 360 ° =0.

375mm cuts circular arc initial drop coordinate is (program of 2) whorl milling (Fanuc system) % N10 G90 G00 G57 X0.

Y0.

N20 G43 H10 Z0.

M3 S2512 N30 G91 G00 X0.

Y0.

Z-20.

375N40 G41 D60 X0.

Y-13.

690Z0.

N50 G03 X15.

Y13.

69Z0.

375R13.

747F92 N60 G03 X0.

Y0.

Z1.

5I-15.

J0.

N70 G03 X-15.

Y13.

69Z0.

375R13.

747N80 G00 G40 X0.

Y-13.

690Z0.

N90 G49 G57 G00 Z200.

M5 N100 M30 % CNC Milling