In CNC Machining, cutting tool knife the dot calls treatment line relative to the contrail that moves at workpiece. When process designing, the affirmatory principle that machines a course basically has the following: (1) the machines precision and exterior surface roughness requirement that should assure a spare parts. (2) should shorten as far as possible treatment course, reduce time of shift of cutting tool light locomotive trip. (3) should make numeric calculation simple, block amount is little, in order to reduce process designing workload. To choosing the numerical control machine tool of position control, ask fixed position precision is taller only, fixed position process as far as possible fast, and the motion of cutting tool photograph to workpiece the course nots matter, because this kind of machine tool should press light locomotive trip the shortest will arrange footpath line. Determine the athletic size of cutting tool axial even besides, its size is main by decision be cominged to by the hole depth of treatment spare parts, but also should consider a few auxiliary measure, be like cutting tool introduce be apart from and exceed Cheng amount. Ask to positional precision taller aperture fastens treatment, the treatment that should note hole particularly is sequential arrangement, when arrangement is undeserved, take the backlash of reference axis likely, affect positional precision directly. If graph 2-23 place is shown, graph A is part drawing, in the boring on this spare parts the hole with 6 same size, have line of two kinds of treatment. When the line that shows by B plan institute is machined, as a result of 5, 6 aperture and 1, 2, 3, way of 4 opening fixed position is opposite, y direction backlash can make locate the error increases, and influence 5, the positional precision of 6 aperture and other aperture. A) B) C) graph 2-23 bores hole treatment course sketch map shows a line by C plan institute, much shift of the upgrade after machining 4 aperture is apart from P dot one paragraph, fold again next come back to machine 5, 6 aperture, such direction are consistent, can avoid backlash introduce, rise 5, the positional precision of 6 aperture and other aperture. When whorl of the car on numerical control machine tool, answer to maintain strict speed ratio relationship with the whirl of machine tool main shaft to feed along the Z of pitch direction, because this should avoid,be quickened in feed orgnaization or the cutting in decelerate process. Should have for this introduce distance δ 1 and surmount distance δ 2. If graph 2-24 place is shown, δ 1 with δ the numerical value of 2 and machine tool pull the dynamic character that uses a system to concern, concern with the precision of the pitch of whorl and whorl. General δ 1 for 2 ～ 5 ㎜, take big cost to the whorl of big pitch and high accuracy; The 2 1/4 that take commonly control δ . When be like whorl ending place to did not retreat knife chamfer, the figure that ending manages and numerical control system are concerned, retreat knife ending by 45 ° commonly. When whorl of graph 2-24 cutting introduces part of distance milling plane, use commonly establish milling cutter side edge to undertake cutting. Receive knife mark to decrease, assure quality of spare parts surface, to cutting tool cut and cut a program to need elaborate design. If graph 2-25 place is shown, when outline of the surface outside milling, of milling cutter cut and cut a dot to answer to go up along the extension line of curve of spare parts outline tangential cut and cut spare parts surface, and do not answer edge law to cut a part directly, produce nick in order to avoid treatment appearance, make sure spare parts outline is smooth. When surface of the outline inside milling, cut and cut cannot denotative, at this moment milling cutter can be cut along the normal direction of spare parts outline and cut, cut its, cut a dot to choose in spare parts outline the node of two geometry element is in. Graph 2-26 place shows the line of 3 kinds of treatment to machine groove. Graph 2-25 is cut cut means A) B) C) the course taking a knife that A of route chart of treatment of graph 2-26 groove and B part to cut law and annulus to cut a law to machine groove all right to use; Graph C cuts a way all right to be used first final annulus cuts one knife light to make outline appearance. In 3 kinds of plan, a plan plan is the wrongest, c plan plan is best. Want to avoid feed stand in outline milling process, because of,meet otherwise the abrupt change of milling force, outline will be in in halt apparently leave knife mark. CNC Milling