Precision and surface q±♣↕uality of main parts during finishi¶®ng

Manufacturers of CNC vertical machining centers talk about the process of γ∏™≈dividing parts accord$ ing to the machining ♠αaccuracy, rigidity and d®"eformation of the parts in the CNC parε≈t machining center. T§₩≠✘he processes should be divid£<∑ed according to the rough and>™ finishing, that is, the rou✘™‌ghing is completed fir←≠₹÷st After that, semi-finishing and fin♠₽€ishing are performed. For a ☆→♦±certain processing surface, it sho¶✘uld be completed in the order of r>α≠∏ough machining-semi-fin↕×ishing-finishing.

      &₹$§nbsp; During rough machining, the<& performance of the machine tool and th♠α¶e cutting performance of the tool₽§ should be fully exerted under the cond✔♣₽£itions allowed by the processing qualε★✔ity, tool durability and rigidity  ♣of the machine tool-fixtur‍≥e-tool-workpiece system, aεβ♦¶nd a larger number of cutting times sh☆¥ould be used to obtain Machinin₹ε&αg conditions where the remainin¶'g amount of each par∏★®t before finishing is aα£s uniform as possible. The precision anφ₽↔d surface quality of t ¶he main parts during the finishing pr≈ ♣ ocess, so the final cont≠☆our of the part should us₹•§ually be continuously fiΩ​Ωnished by the next knife duringΩ ε♠ the finishing process. For processing £β↓βquality, in general, it is ad £∑visable to leave a finishing allowa£↕♦nce of 0.2-0.6mm. Between roughin₽σ∏g and finishing, a perio ¶​<d of time is needed to full"☆‌y restore the deformation of ​≈the parts after roughing, and then ‍∑"♥finish machining. To improve the machi↓γ£✘ning accuracy of parts.¶≈λ

Generally on CNC machine to&¶∞₩ols, especially on machining centΩ•ers, parts and procedures ca$≠n be concentrated to a ✘ large extent, that iδ→​☆s, parts should complete most o✘™•r all of the processes that can be proc±≈≈↓essed by this CNC machine tool← ✔ in one clamping. Concentrated proced®ε€£ures can reduce the number oλ♦£‍f machine tools and the num γ≠'ber of workpiece clamping times≤∑, reduce unnecessary positioning error‍&εσs, and increase productivity. For th↕↑↔e processing of the holeσ≤≈← system with high coaxi<€ality requirements, aft→>≥er one installation, all >₽&'the processing of the coaxi♦ al hole system should be comp∏←leted by sequential ‌γcontinuous tool change, and then♦₹ holes in other location÷₩™≠s should be processed to‌↔♥  eliminate the effect of repea∞‍→∏ted positioning errors. Improve the cσ‌&oaxiality of the hole sys₽♥™tem.

        According✔∞★α to the distance betw←♠✔'een the processing part σ¥£'and the tool setting p<®>oint, in general, the par∞☆♥t close to the tool setβ≤®φting point is processed firs©↕→t, and the part far from€<↑ the tool setting po∏₹•int is processed later to shorten the €φtool moving distance and reduδ♣∏ ce the idle travel time. F'δπ or turning, near-to-far is ₩≠¶ also beneficial to maintain the r☆•↕igidity of the blank ‍ε♥or semi-finished product and im ∞₩↔prove its cutting conditions. For↕α≤≈ parts that have both a m₽∑ illing plane and a boring ho→•★le, it can be perfor∏✔☆‍med in the order of mil∞‌₽ling the plane first and th‍≈en boring. Because the c↕‌×λutting force is large when mi¶ ≠εlling the surface, the♦↑¶λ parts are prone to deformation.∑♥≤δ Milling the surface first <§ ©and then boring to restore it for a p™'eriod of time, and then boring after it♥€γ recovers the deformat♣₽↕ion, is conducive to the acc"λ∑uracy of the hole processing. Pla∏∑ne, the hole will produce bur​$♠★rs, flashes, and affect the assem$≈'‌bly of the hole.