Numerical control processing integrates drilling, fräsning, vändning, tråkig, brotschning, tapping and other processes into a whole, which requires high technical quality of technicians. A true CNC master should have not only a wealth of theoretical level, but also superb practical experience and practical ability.
Automatic programming of CNC machining
The automatic programming of CNC machining is also called computer-aided programming, det är, most or all of the programming is done by the computer. Such as completing the calculation of coordinate values, compiling part processing procedures, automatically outputting and printing processing procedures and preparing control media.
One hundred years ago, high-speed steel cutting tools began to be used, and the cutting speed for milling ordinary steel was only 25-30m/min. Compared with carbon tool steel and alloy tool steel, the processing at that cutting speed is “high-speed milling”. Därför, “high-speed steel” was named.
The high-speed milling system is a complex dynamic system, which is prone to chatter vibration when machining thin parts. Flutter is a very strong relative vibration between the tool and the workpiece during the milling process. This kind of vibration will destroy the relative correct position of the tool and the workpiece, och minska ytbearbetningskvaliteten och fräsningseffektiviteten. Under en lång tid, skärande prat har varit ett stort forskningsämne inom maskintillverkningsindustrin och fräsbearbetning.
Efterbehandling av delar är en algoritm baserad på böjda ytor. För flerböjda modeller, lyftet av fräsen bör minskas så mycket som möjligt. Detta kräver att den genererade fräsverktygsbanan ligger inom samma vinkelområde eller kräver olika tillåtelser i axiell och radiell riktning.
Ultraprecisionsskärning började med SPDT-teknik, som stöds av luftlagerspindlar, pneumatiska diabilder, hög styvhet, högprecisionsverktyg, återkopplingskontroll, och miljötemperaturkontroll för att erhålla ytjämnhet på nanonivå. Diamantskärare används mest, som används i stor utsträckning vid bearbetning av platta och asfäriska optiska element av koppar, plexiglas, plastprodukter (såsom kameraplastlinser, kontaktlinser, etc.), keramik och kompositmaterial.
The machining center performs multi-process (vändning, fräsning, borrning, tråkig, tappning, etc.) and multi-face composite processing on prismatic parts through automatic tool change and table indexing. Practice has proved that the composite machining center is indeed beneficial to solve the shortcomings of long delivery time, low resource utilization, more products in process and slow capital turnover of small and medium-sized machinery manufacturing enterprises. Turning and milling combined processing has thus gained more and more common applications in industrial production.
Svårbearbetade material är material med dålig svarvnings- och fräsningsförmåga. Prestanda för detta material är större än eller mindre indikatorer (HB> 250, σb> 1000 MPa, δ> 30%, αk> 100 MPa, K <41.8 W / mk) one or more, are all difficult to cut materials. It can also be measured by phenomena in the cutting process (cutting force, cutting heat, tool wear and tool durability, processed surface quality and chip control, etc.).
Cutting is roughly divided into turning, fräsning, and center-tooth-based cutting (end face cutting of drills and end mills, etc.). The cutting heat of these cutting processes has different effects on the cutting edge. Turning is a continuous cutting, the cutting force on the tip does not change significantly, and the cutting heat continuously acts on the cutting edge; Milling is a kind of intermittent cutting, and the milling force is intermittently acting on the tip of the blade, and vibration will occur during milling. The heat effect on the cutting edge is the heating during cutting and the cooling during non-cutting alternately, and the total amount of heat received is less than during turning.
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