Milling is machined (below)

  • Time:
  • Click:154
  • source:NODIE CNC Machining
The device of face of 7 milling big circular arc should machine accurate big round dambered surface on milling machine, the special tool that can use graph 4-6 place to show will machine. This device is the principle job that uses brace connecting rod. Swing the one aspect of the matter of 4 has mesa an aperture, sell through securing 3 and secure the mat iron on workbench face 2 photographs join, the axes that makes its circle solid a system of fixed quotas for marketing is rotational, another end has one waist form to open slot, and in circumgyrate workbench through securing the activity of 5 sells the 6 mesa with revolving stage to join. When rotational circumgyrate workbench, the activity is sold can drive swing the roll that mesa makes spool thread of a system of fixed quotas for marketing that circle solid. When treatment, want a foundation only R of face of workpiece circular arc and the diameter that establish milling cutter, adjust the center of solid a system of fixed quotas for marketing and milling cutter to be apart from, but the mill of circular arc face workpiece is become. When machining the round dambered surface with very big radius, still can receive milling machine workbench long, fasten is sold be in mesa besides. Structure of this kind of tool is simple, use convenient, treatment precision is taller. The work with elliptic aperture of 8 milling ellipse is very much, wait like elliptical column, elliptical aperture. Are they how form? Analyse the relationship between circle and ellipse. The workpiece of a columnar aperture, should use a knife to cut bring up the rear in line of center of perpendicular Yu Yuanzhu, those who get is sectional it is a round hole, if cut off the central line of direction and aperture tilts some angle, what what get at this moment is sectional it is an elliptical aperture however. Big diameter of the aperture inside its is called long axis, express with D1, small diameter is called short axis, express with D2, if pursue,4-7 place is shown. The central line included angle that cuts off direction and aperture is smaller, the difference of elliptical long axis and short axis length is bigger. Go up in vertical milling machine even if machine elliptical aperture according to this principle. When aperture of ellipse of the boring on milling machine, installation of boring cutter lever is in establish taper hole of milling head main shaft inside, according to elliptical Kong Chang axial D1 size adjusts milling cutter, make milling cutter point of a knife rotates radius R is equal to D/2 of elliptical major semi-axis. Must have turned boring cutter lever next an angle, make the central line of the central line of its arbor and workpiece tilts α horn, if graph 4-7 place is shown, α horn can use next form calculation: D1 of the 　 in type -- length of axis of elliptical Kong Chang (Mm) ; D2 -- length of elliptical aperture short axis (Mm) . Exemple: In aperture of ellipse of boring of vertical milling machine, its grow axial diameter D1=100mm, d2=96mm of short axis diameter, its machine a point to be as follows: (When 1) workpiece is installed, the axes of elliptical aperture should perpendicular at workbench face, and the short axis direction of elliptical aperture must be mixed direction of fore-and-aft workbench feed is parallel. (Axes of 2) main shaft should be mixed school of elliptical aperture axes is inside same plane. This can use the method to the center, the position that adjusts transverse workbench will achieve. (The axial feed of 3) workpiece, can use litre fall workbench undertakes, but those who want an attention is elliptical aperture should not be too long, the arbor that tilts otherwise can be touched with hole wall photograph. (4) basis is formulary, 16 ′ of α =16 ° . 9 big spherical milling production middling encounters a lot of bearing tile, its are spherical the diameter is in more 300mm above. The demand of spherical dimension precision with these large made of baked clay bearing is high, demand of exterior surface roughness is low. Machine difficult problem to solve this, use go up to undertake boiling pressing to spherical surface in milling machine after the milling on milling machine and mill, the surface roughness of spherical surface can amount to Ra(0.

8 ～ 0.

4) μ M, spherical surface layer is sclerotic after be being pressed through boiling, raised wearability. (1) machines a principle spherically. When milling is spherical, want to make milling cutter and workpiece rotate at the same time only, make the whirl of milling cutter the whirl of center and workpiece the center intersects at a bit, the contrail that milling cutter forms on workpiece is spherical one part. Want workpiece to rotate only a week, workpiece surface is round face. (The installation of 2) workpiece and milling cutter rotate diametical choice. The circular table that what if pursue,4-17 place shows workpiece and milling machine use is installed together go up in milling machine workbench. With versatile shaft coupling the transmission shaft circular table and connection of gear of drive of milling machine feed rod, the drive that adopts milling machine feed rod drives shaft coupling, circular table and workpiece to turn accordingly, the feed when forming milling moves. The whirl of head of bit body knife diameter, be more than workpiece ball bizygomatic breadth to spend B, it is D=(B+10)mm left and right sides commonly. (3) milling method. After work is good in circular table installation, must use shift fore-and-aft and litre fall the position of workbench, make the whirl of cutting tool the central photograph coincide with center and spherical workpiece. Can use underline on workpiece search execute and try cut a law to achieve. Cutting dosage is when thick mill, cutting speed is (150 ～ 180)m/min, feed speed is (50 ～ 100)mm/min, cutting deepness is (2 ～ 4)mm; When mill of essence of life, already machined exterior surface roughness to reduce, should use higher cutting rate and minor feed rate. The cutting career that chooses commonly is (180 ～ 220)m/min, feed speed is (30 ～ 60)mm/min, cutting deepness is less than 0.

5mm. Right now, spherical surface roughness under Ra3.

2 μ M. (4) boils press treatment. Boil if graph 4-8 place is shown,press a tool, it installation is on mill bit body. Boil when pressing, make roll the pellet contact that presses a tool to go up spherical hind, again horizontal feed (0.

05 ～ 0.

07)mm, make its have constant pressure to workpiece surface, open motive bed to make boil next pressure the tool rotates and make circular table drives workpiece to rotate, undertake boiling pressing to workpiece surface. In rolling the process that control, toward spherical apparently Tu Xie lube, undertake lubricating. Roll the speed when pressing to be 150m/min left and right sides, feed speed is 28mm/min. Roll the spherical surface surface roughness after pressing to be able to achieve Ra(0.

8 ～ 0.

4) μ M. Move when 10 mill rack those who be apart from hang annulus frame mobile and fore-and-aft workbench is used on milling machine when mill rack, use graduation board law or axis of dividing head side to hang round of law to make fore-and-aft workbench moves commonly pitch. Can be these two kinds of methods, give error operation trouble, easily not only, and go because of installing dividing head to occupy the one part area of workbench, affect the installation of workpiece. Because if graph 4-22 and graph 4-23 place show two kinds of special rack to move,this was made,be apart from hang annulus frame, operate in outdated not only handy, and move the precision that be apart from is very tall also. The mill rack that graph 4-22 place shows moves be apart from hang annulus wearing is through a pair tine counts same bevel gear 1: 1 speed ratio mixes handwheel hang round of couplet. Should locate with hand push ahead 1, roll turns handwheel 5 hind, fixed position is located in the force answer of bedspring of have the aid of in the fixed position chamfer of handwheel, mix through bevel gear hang annulus transmission, drive workbench fore-and-aft guide screw rotates, make workbench fore-and-aft and mobile a pitch. Mill is different when the rack of modulus, change to be hanged differently annulus. Hang round of computation formula to be as follows: The Z1 in type, Z3 -- number of active teeth of a cogwheel; Z1, Z4 -- number of passive teeth of a cogwheel: M -- the modulus of rack (Mm) ; P -- pitch of fore-and-aft workbench guide screw (Mm) . Exemple: In the spur rack of M=5 of modulus of the milling on milling machine, workbench is fore-and-aft P=6mm of guide screw pitch, beg register number of teeth of a cogwheel. Solution counts Z1=55 according to formulary and active teeth of a cogwheel, z3=50; Passive tine counts Z2=30, z4=35. When using, will move be apart from hang annulus wear installation to be in milling machine workbench is right upright, hang those who had calculated installation of round of Z1, Z2, Z3 is being hanged annulus frame on, z4 installation is in workbench is fore-and-aft guide screw head, can undertake mill rack moves be apart from. What graph 4-23 place shows also is rack of a kind of mill moves be apart from use hang annulus frame. Install it in milling machine workbench right end, with bolt 2 fixed go up in workbench. Driving gear Z1 and handle installation are on Ⅰ axis, gear Z2 and Z3 installation are on Ⅱ axis, gear Z4 installation is in workbench is fore-and-aft head of transmission guide screw. Should pull out fixed position is sold 7, shake pass on handle 6, drive workbench fore-and-aft guide screw is rotational, the pitch with make workbench fore-and-aft mobile and certain. The tine number as a result of Z1, Z2, Z3 and Z4 is respectively 29, 60, 52 with 48, the pitch P=6mm of fore-and-aft guide screw, hang annulus wear handle to turn, workbench is fore-and-aft and mobile 3.

14167mm. The distance that also is workbench shift namely is equal to the pitch of modulus M=1. Want to remember only: Handle turns, workbench is mobile the pitch of a modulus, handle turns 2.

5 when turning, m=2 of workbench shift modulus.

The pitch of 5. The rest may be deduced by analogy, the revolution of handle is equal to the modulus that machines rack. Operate not only so handy, and facilitating memory. CNC Milling