What does the method that assure and raises a machine tool to machine precision have?

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  • source:ACHER CNC Machining
In machining process, often a lot of elements affect the final treatment quality of workpiece. How to make the treatment of workpiece achieves quality requirement, how to reduce all sorts of factors the influence to machining precision, become the issue that must consider before treatment. In machining, the error is inevitable, but the error must be inside permission range. Pass error analysis, master the basic rule that its change, adopt relevant measure to reduce machining error thereby, raise treatment precision. Assure and raise the method that machines precision, can generalize roughly it is the following kinds: 1, the geometrical precision that reduces primitive error to raise a spare parts to machine an use machine tool, raise clamping apparatus, measure and tool itself precision, control machining complex suffers force, be heated to be out of shape, cutting tool wears away, internal stress causes be out of shape, measure an error to wait to all be belonged to reduce primitive error directly. To raise machining precision, need to undertake an analysis to producing each primitive error of machining error, according to different situation the main and primitive error to causing machining error adopts different measure to solve. The geometrical precision that should raise place to use accurate machine tool as far as possible to the treatment of nice spare parts, stiffness and control treatment heat are out of shape; is opposite the spare parts treatment that has figuration face, basically be the mounting error that how reduces cutting tool of sum of errors of appearance of figuration cutting tool. This kind of method is a the application in production is wider kind of basic method. It is to be after the main factor that finds out generation machining error, try to eliminate or reduce these factors. For example the turning of long and thin axis, used now take a knife greatly retrorse turning law, basic need bends besides what axial cutting force causes be out of shape. If complementary with bedspring tip, can eliminate heat to be out of shape the heat that cause is affected stretchily further. 2, compensate compensation method of primitive error error, it is factitious ground is built give a kind of new error, go offsetting the primitive error in original machining complex. When primitive error it is the factitious error when negative worth is taken be worth, conversely, take negative worth, make both size equal as far as possible; Perhaps use a kind of primitive error to offset another kind of primitive error, also be to make both size equal as far as possible, way is opposite, achieve thereby reduce machining error, raise the goal that machines precision. 3, the geometrical error that transferring primitive error error to change a way is move machining complex essentially, suffer force to be out of shape be out of shape with heat etc. The example of error move law is very much. When if become,treatment of spare parts of short of of machine tool precision asks, often not be to raise machine tool precision blindly, go up from craft however or way thinks on clamping apparatus, create a condition, make the geometrical error of the machine tool changes the aspect that does not affect treatment precision. If taper hole of grinding main shaft makes sure the coaxial of its and journal is spent, not be to rely on the circumgyrate precision of machine tool main shaft to assure, rely on clamping apparatus to assure however. After float connection should be being used between machine tool main shaft and workpiece, the primitive error of machine tool main shaft was dropped by move. 4, equational and primitive error is in treatment, as a result of semifinished product or go up the existence of working procedure error, often cause the machining error of this working procedure, perhaps change as a result of workpiece material function, perhaps go up the craft of working procedure is changed (after be being changed like semifinished product essence, the cutting before machines working procedure to cancel) , cause primitive error to produce bigger change. Solve this problem, had better be to use the method that adjusts equational error in group. The essence of this kind of method presses primitive error namely its size is equational for N group, range of error of every groups of semifinished product is narrow for original 1/n, do not adjust treatment by each constituent next. 5, the axis with primitive very tall to cooperating precision to ask error mixes leveling aperture, often use abrade technology. Grind to provide itself and do not ask to have high accuracy, but it is doing opposite exercise with workpiece minim cutting undertakes to workpiece in the process, high point is ground gradually (of course, mould also by workpiece abrasion one part) , make workpiece achieves very tall precision finally. The attrition between this kind of surface and tatty process, it is an error ceaseless reductive process, this is error leveling law. Its essence uses the face that has close tie to be compared each other namely, mutual examination finds out difference from inside contrast, undertake be correctioned each other next or each other is standard treatment, make workpiece is narrowed mix ceaselessly by the error of treatment surface leveling. Aborning, a lot of nicety are fiducial (wait like flat, straightedge) be to use treatment of error leveling law to come out. 6, in method of treatment of on the spot is being machined and be being assembled, drag in of some precision problem arrives the correlation between spare parts or component, quite complex, if rise blindly 0, component itself precision, sometimes not only difficult, impossible even, if use on the spot to machine a law (also say oneself machines) of law of make repairs and supply replacements, likely very solve the precision problem that looks very difficult conveniently. Method of treatment of on the spot machines middling to be used in mechanical spare parts as the significant step that makes sure the spare parts machines precision. CNC Milling CNC Machining