The cutting that get mill machines bear analysis

Operation of milling treatment milling has to use or the cutting blade of an above circles the cutting tool that writes some to secure an axis to rotate to have the operation of cutting, the cutting tool when cutting is secured and workpiece feed is machined with finishing. The figure cutting bits that produces by cutting place can distinguish a this cutting operation and other metal cutting to operate different place further, milling place arises cutting bits is short and discontinuous fragment commonly, what emphasize here is, generation of the meeting when milling is discontinuous because the geometrical appearance place of cutting tool is caused,cutting bits is; is not discontinuous like turning treatment because cut the burst place of bits to arise,cutting bits is. To most milling operation, not metabolic cuts bits ply to arrive by the one end that cuts bits additionally one aspect of the matter is being changed all the time, likelihood happening is cutting the biggest ply that cut bits the either of bits is carried or standing by position of the center that cut bits, but this inspects cutting process completely and decide. The because cut bits,becomes regular sex discrete change when milling, make cutting force and cutting temperature also show periodic change, and be not steady state. When cutting tool cuts work, point of a knife can be pounded steep shake strongly, receive is cutting load is being changed all the time. When cutting tool cuts work, cutting tool surface is cold, but be heated in cutting bits to fashion a process gradually, after should cutting bits to form, begin to be cooled again, cut behavioral generation till the next. Cutting tool cuts fashionable steep shake phenomenon very adverse to the life of cutting tool itself, and cooling cycle is helpful, unless what use data is very sensitive to hot steep shake. In cutting process, because cutting load is to show periodic change, this provided the energy that the oscillatory natural mode place that causes share of tool machine either requires, this kind of oscillatory meeting makes exterior coarseness very poor, and will make cutting tool life is reduced. One of the biggest advantages that milling treatment operates are small and light cutting tool next whirl is led very easily in high speed, so that be on the workpiece with dimension and appearance very big change, Xuan makes an evenness or bent appearance. The plan of graph action cutting component of force at milling cutter and workpiece or milling machine workbench is shown like plan institute when be being machined to undertake milling, the cutting component of force of knife of action Yu Xi and workpiece or milling machine workbench. Measure a milling load with dynamometer: The cutting component of force of knife of action Yu Xi advocate cutting force or circumferential (tangential) Fz of component of force: The tangent direction that its action turns at milling cutter, to consume the main cutting power of power. Fz of radial component of force: The radial of knife of its action Yu Xi, with tangential the join forces with force both Fz, this will cause milling cutter to arbor bends and be turned round. Fy of axial component of force: Direction of line of cutter shaft of its action Yu Xi, the cylinder that size ages to helix is concerned with the size of helix angle β for milling cutter. Action uses helix tine cylinder at the cutting component of force of workpiece or milling machine workbench when milling cutter milling, the size of join forces Fzx that Fvh(Fxz) and milling fight force Fz and Fx is equal, effect way is opposite, and action the cutting force at workpiece or workbench dissoluble for the following 3 component of force: The level divides force Fh: Its and milling machine are fore-and-aft feed roll direction is parallel, action is in milling machine is fore-and-aft on feed orgnaization. Fv of perpendicular component of force: Its are perpendicular at milling machine workbench. To milling of milling cutter of helix tine cylinder, fv is the component of force of Fvh(Fxz) , those who depend on milling means is different, can make workpiece is raised from workbench or press to workbench; To carrying milling cutter milling, fv and Fy size are equal, but way is opposite. Fv of transverse component of force: Bed of its parallel Yu Xi is transverse feed roll direction, bed of action Yu Xi is transverse feed orgnaization. milling of columnar to helix tine milling cutter, fv and Fy size are equal, way is opposite; To milling of upright milling cutter, fv is the component of force of Fho(Fxz) . 2.

Get cutting treatment broach is one kind can be on metallic spare parts fast and the tool that produces aperture easily, its can be used on high accurate drill, for example PCB bore. And its penetrate longly, high as a result of life lead and wide accept favour. Broach of average level fried dough twist has two advocate blade of cutting blade, two negative cutting and a horizontal blade. In cutting process, the cutting load that place of every cutting blade gets is below good case offset each other, and change via arranging brief hind can regard the synthesis of each cutting load as to twist be apart from Me and feed load Ff. Show according to experimental result data, broach of standard fried dough twist gets those who cut load to be on each cutting blade to if next watches are shown,allocate proportion. By can be informed in the watch, get when cutting average data, axial load basically comes from horizontal blade, make an appointment with the 57 ﹪ of force of total axial; And torque is main advocate cutting blade arises, make an appointment with the 80 ﹪ of total torque. Express 1 get cut bear allocation scale relation getting cuts load advocate 57 ﹪ of ﹪ of Ff 40 of load of feed of first flank of cutting blade horizontal blade 10 ﹪ of ﹪ of Me 78 of 3 ﹪ torque the feed load Ff(N) when head getting cuts twist drill of 12 ﹪ standard, get cut torque and cutting power can benefit: Torque MeMe=9.

Ff F=9 of 81Crd0XTfYTKT axial load.

In the type on 8CFd0XFKF, CT, CF makes good omissions for cutting coefficient, XT, YT, XF, YF all can is informed by next watches for cutting index. KT, KF is correction coefficient product, if use new broach to undertake getting cutting, criterion correction coefficient KF is axial load 0.

9, me of torque correction coefficient is 0.

87; D0 expresses broach diameter. Watch 2 auger cut coefficient and index to consult the relation expresses treatment ＝ of B of coefficient of material of material cutting tool and σ of steel of CF XF YF CT XT YT of moment of force of exponential axial force 0.

637GPa high-speed steel 61.

2 1.

0 0.

7 0.

031 2.

0 0.

143 1 of high-speed steel of 1Cr18Ni9Ti of 8 refractory steel.

0 0.

7 0.

041 2.

0 0.

High-speed steel of 190HB of 7 casting pig 42.

7 1.

0 0.

8 0.

021 2.

0 0.

8 exceed hard alloy 42 1.

2 0.

75 0.

012 2.

2 0.

High-speed steel of 150HB of 8 malleable iron 43.

3 1.

0 0.

8 0.

021 2.

0 0.

8 exceed hard alloy 32.

5 1.

2 0.

75 0.

01 2.

2 0.

8 blame all pledge copper alloy high-speed steel of 100 ～ 140HB 31.

5 1.

0 0.

8 0.

012 2.

0 0.

8 and auger cut power to be able to be informed by next type. In Pm=2pTn10-10/60 type, t is pitching moment, the unit is Nm; N expresses the rotate speed of broach or workpiece, the unit is R / Min; Pm expresses what what beg to get cut power, the unit is KW. CNC Milling