The error analysis that CNC Turning machines and settle way

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  • source:BREDA CNC Machining
: The causes as a result of circular arc of lathe tool point of a knife and clearance of axial of lathe ball guide screw machining error in analysing numerical control lathe to use; Those who put forward to reduce machining error is specific settle way. Lathe of introductive numerical control because its precision tall, height is flexible automation and the character that suit to machine complex part, the applied all the more that creates a company in machinery is extensive. However, of component of the drive of numerical control lathe, motion or machinery, lathe tool point of a knife also is not real point, however a paragraph of circular arc, produce machining error easily still. The analysis undertakes in the light of these two kinds of circumstances below and put forward to settle way. Graph part drawing of 1 point of a knife pursues the machining error that circular arc of 2 point of a knife causes pursues route chart of 3 common treatment pursues the error error analysis that circular arc of 1 point of a knife causes 4 improvement treatment route chart is in use process of numerical control lathe, be machined to reduce the surface roughness of workpiece surface, slow down cutting tool wears away, improve cutting tool life, normally circular arc of wear of blade of lathe tool point of a knife, circular arc radius is in commonly 0.

4 ～ 1.

Between 6mm. If the graph is shown 1 times, use try cut a law to be opposite position of the does not fix tool carrier center 2:0 by A, B X when the knife, Z. Such, the knife that machine program place describes the dot is P dot, numerical control system will control the athletic contrail that P nods, and the cutting blade that acts well actually when cutting is each point of tangency on circular arc of point of a knife, this will naturally produce the appearance error that processes the surface. Round outside turning, inside when aperture and end panel, this error is 0. And when machining dambered surface and cone, this error is apparent. Graph SR10-0 of 1 spare parts.

The error analysis of 04 spherical treatment sees a picture 2. Line of the M in the graph is the contrail of the P that machine program place describes, namely the theoretical size of workpiece, and the outline after be being machined actually is N line, the shadow is little cutting part, namely machining error. Radius of circular arc of hypothesis point of a knife is R=0.

4mm, theoretical analysis makes clear, n line is radius is R-r=9.

The circular arc of 6, two circular arc of M, N R=0 of apart of Xiang Jun of X of the centre of a circle, Z.

4mm, the biggest error is about 0.

17mm, do not satisfy precision to ask. The error eliminates a method to choose center of circular arc of point of a knife to be a knife dot, call radius of point of a knife to compensate (instruction of G41, G42) , its process designing and treatment move are as follows: Press outline surface process designing, install right knife to fill, graph 1 spare parts is spherical finish machining program is as follows: ... N04 G42 G00 X8 Z50 * N05 G03 X20 Z42 F100 * ... nod pair of knives with A, B, make in corresponding direction cutting tool increases displacement amount: (Slant knife kind) DX =2r, DZ =r, or (dagger kind) DX =2r, DZ =0; Input R of cutting tool radius; Treatment. Call cutting tool radius to amend a statement, special attention chooses place of proper to wanting to find out after the knife the centre of a circle of point of a knife with A, B. Fill in the knife when building, should make workpiece of edge of the centre of a circle of circular arc of point of a knife treats treatment outline surface (process designing contrail) motion, and lathe tool is not circumgyrate kind cutting tool, traditional turning machines the issue that does not involve the centre of a circle of point of a knife basically, reason beard compensates the knowledge that has essence to the cutting tool radius of system of turning numerical control. 2 guide screw procrastinate in the error error analysis of deputy clearance generation board guide screw deputy clearance is inevitable existence, to common lathe, gap is bigger; To numerical control lathe character, because use, is ball guide screw deputy, and undertook tighten beforehand, from theoretic tell, was to obtain 0 clearance, without retrorse light locomotive trip. Actually, to having the drive disk assembly that moves relatively, clearance is inevitable. Deputy to the ball guide screw of high accuracy and character, just space is very little; If obtain 0 clearance truly, the obstruction that move can increase. Consequently, when guide screw moves reversely, still put in little light locomotive trip, this light locomotive trip machines precision with respect to enough influence. Processing a rod kind when the spare parts, general treatment course is shown 3 times like the graph, it is to pass normally below a paragraph of program will undertake: ... N04 G00 X30 Z2 * N05 G01 Z-25 F100 * N06 X40.

015 * N07 Z-80 * ... D40+0.

030 outside round diameter treatment comes out, but every time treatment dimension can slant big or slant small, short of precision asks. The error eliminates methodological logarithm to accuse lathe, can use much return (or ongoing) a paragraph of distance, again ongoing (or go back) the treatment seat that wants to place, make guide screw deputy from beginning to end with same a flank posture contact will eliminate error of guide screw deputy clearance. Cutting tool takes a picture the treatment course of 4, the program is as follows: ... N04 G00 X30 Z2 * N05 G01 Z-25 F100 * N06 X45 * N07 X40.

015 * N08 Z-80 * ... the save labour when this method is saved, the result is favorable. Agree with the numerical control lathe of general precision is used when machining important measure, the obstruction that avoided to use machinery to the method will reduce gap and be brought increases and adjust the problem such as difficulty. Machine tool of numerical control of 3 last words processes type hind, every dimension should contrast the design is measured carefully. Be like occurrence error, usually, fill through adjusting a knife, modification program can decrease to be eliminated even, achieve precision requirement. The CNC Machining program with reasonable relatively complex work out is debugged, revise, treatment gives eligible product, it is personnel of numerical control process designing is reflected one kind of integrated ability. CNC Milling CNC Machining