Roller presses sealing strip of car vehicle window the CNC Machining of round screw die

5mm, thick 0.

The SPCC metal strip of 7mm, roller is introduced to press in what comprise by 36 pairs of round screw die undertake successive roller presses processing on product line (the semi-manufactured goods that partial roller controls process and) of finished product appearance. The need after wearing away as a result of round screw die is bought from abroad, and entrance fittings price is high, because this raised manufacturing cost. Those who be implementation round screw die is homebred change make with repair, we fall in the circumstance that lacks data of spare parts blueprint, beg computation instead through be being mixed to the mapping of round screw die, completed products plan of round screw die. Because figure of round screw die face is complex (by multistage and linear comprise) with circular arc, and appearance of 72 round screw die each are not identical (all be sheet manufacturing) , appearance and dimension precision demand are very high, together with round screw die must use the mould material of tall hardness to make, the cutting treatment difficulty of round screw die is very accordingly great. What 2 round screw die machine plan to design round screw die to be high accuracy, tall hardness is complex model spare parts of face swing tower. Complex model face swing tower can use copying, CNC Machining normally, shape the treatment craft such as grinding. Copying applies to the treatment of big batch spare parts normally. Shape grinding treatment needs beforehand the diamond with preparation and spare parts consistent face eletroplates shape nap emery wheel, this to sheet cost is too high small lot treatment. Accordingly, complex model the sheet of face round screw die treatment uses CNC Machining means relatively reasonable. The biggest difficult problem that cutting machines tall hardness round screw die is cutting tool of common hard alloy wear away splitting, cannot assure to machine quality. Use for this need get together nitrogen of brilliant cubic metre changes boron (PCBN) cutting tool. PCBN material is n duality of artificial below high temperature high pressure complex exceeds hard data, its hardness is next to diamond, thermal stability criterion excel diamond. PCBN cutting tool is right metal of iron a group of things with common features has bigger chemical laziness, the heat-resisting that suits to machine HRC45 above particularly, wear-resisting, be able to bear or endure material of corrode difficult treatment (if temper by dipping in water is hard steel of tool of hard alloy of high-speed steel, temper by dipping in water, mould steel) , under the heat-resisting alloy of HRC35 above, HRC30 but the pearlite that machines very hard with other razor blade. Use PCBN cutting tool with the car (boring, mill) era is ground undertake strong voice cutting, have efficiency tall, flexible good, invest little, craft to wait for an advantage simply. Machine the characteristic of cutting tool of requirement and spare parts of round screw die, PCBN and CNC Machining through integration analysis, decide program of treatment of round screw die face is: Columnar face and aperture use groovy craft to machine outside round screw die; Part of round screw die face uses cutting tool of common hard alloy to go up to be mixed into travel rough machining in numerical control lathe before heat treatment semifinishing machining, obligate is certain mental allowance; Temper by dipping in water is with PCBN cutting tool after fervent processing on numerical control lathe into travel face finish machining. The process designing of CNC Machining of CNC Machining process designing of 3 round screw die is to be on the foundation of analysises of pair of craft be undertakinged by treatment spare parts, course of craft of the dimension parameter of as the installation position when certain part is machined, opposite as cutting tool motion, treatment (or treatment is ordinal) , the treatment information such as craft parameter and auxiliary operation, press formulary method and format to write machine program sheet with code of standard numerical control, input machine program numerical control device next, control machine tool undertakes be machininged automatically. CNC Machining process designing can use manual process designing, automatic process designing or image process designing. Because round screw die range is sophisticated, and for sheet treatment, accordingly we use American UG software to undertake automatic image process designing. Dosage of program of method of CNC Machining cutting tool, treatment, cutting input with interactive means. Process designing content basically includes: Technology program uses rough machining of cutting tool of common hard alloy and semifinishing machining round screw die face on numerical control lathe (surplus of obligate finish machining) → quenchs heat treatment → uses round screw die of finish machining of PCBN cutting tool face on numerical control lathe. The rough machining of cutting tool round screw die and semifinishing machining (before heat treatment) choose cutting tool of VHB2525 hard alloy; Finish machining (the strong voice cutting after heat treatment) the PCBN razor blade that chooses ISO grade to be VBMW160402, VBMW160404, model of main cutting tool is but at the same time left slant and right the PVVB2525 that slant, the treatment of special place is used left slant or right the PVHBR/L2525M-16 that slant. When numerical control process designing, cutting tool tool cutting edge angle, deputy slant interference does not happen when horny choice should assure CNC Machining, add man-hour to still can go up to undertake adjustment to cutting tool in the machine tool. Although the cutting tool parameter that chooses when process designing is not best parameter certainly, but the versatility that should assure cutting tool and treatment precision requirement. When cutting parameter uses rough machining of hard alloy cutting tool and semifinishing machining, choose cutting parameter to be: Cutting deepness Ap=1mm, cutting speed V=150m/min, feed speed 120mm/min. When using precision work of PCBN cutting tool, choose cutting parameter to be: Cutting deepness Ap=0.

2 ～ 0.

3mm, cutting speed V=110m/min, feed F=0.

1mm/r, feed speed 50mm/min, do cutting. Of cutting tool of the PCBN when finish machining wear away the standard is VB=0.

3mm, cutting tool position and parameter must decide afresh after cutting tool is ground again, weave afresh accordingly machine program. After cutting tool machines orbit craft parameter to decide, need the CNC Machining contrail of program cutting tool. Because complete set round screw die has 36 to be opposite 72 in all, model face figure is very complex, partial place cutting tool arrives very hard even, because this is made to facilitate, can disclose round screw die extent the combination that is a few parts, press contrail of this program cutting tool. It is with the 27th pair of round screw die exemple, curve of design of treatment of its sealing strip and on, issue round of roller to press condition imitate. Its on, next round screw die face can be decomposed respectively for two parts. Because form of round screw die is complex, machine orbit very hard to be conveyed completely with a kind, can part according to appearance of different round screw die accordingly or use different treatment contrail integratedly. Of the 27th pair of round screw die go up adoptable machines round of right share face 3 kinds orbit. The basis is final outline is equidistant slant the treatment contrail of buy, treatment of course of this kind of knife is smooth, precision is taller; ZIG-ZAG parallel machines orbit, the characteristic is machine program shorter; Insert treatment contrail (be similar to cut off treatment) , suit all sorts of chamfer relatively model treatment, but tigidity of cutting tool treatment is poorer. According to appearance of specific spare parts, can part or apply different treatment contrail integratedly. Go up to the 27th pair of round screw die round of right share face, final affirmatory rough machining uses treatment contrail, finish machining uses outline to machine orbit. The CNC Machining imitate of 4 round screw die is the feasibility of program of CNC Machining of test and verify, bed of opportunity of survival of the hair in avoiding to machine a process collides or cutting tool is interfered, CNC Machining imitate must undertake after CNC Machining to program is finished. After treatment imitate means can use the simulation when process designing or process designing ends, imitate goes up in numerical control machine tool. Imitate can be used to display a function when undertaking machining imitate on numerical control machine tool or run a function for nothing. When using indication simulation, input machine program, call graphical imitate to show the function observes contrail of cutting tool motion carefully next, examination cutting tool and workpiece (or clamping apparatus) whether can produce collision. When using airborne travel simulation, input machine program, the cutting tool on installation (or workpiece) , press next " airborne travel " pushbutton (DRY key) , main shaft is not right now rotational, workbench moves automatically by machine program contrail, right now can whether can the validity of contrail of treatment of cutting tool of test and verify and examination produce collision. But should notice, cutting tool and workpiece cannot be installed at the same time, can produce collision otherwise. After process designing ends, undertake on numerical control machine tool imitate needs to take up machining machine tool handling time, the imitate when using process designing does not have this problem. Treatment practice makes clear, choose high-powered PCBN cutting tool to sealing strip of car vehicle window roller pressing round screw die undertakes CNC Machining, can assure to machine quality, reduce finished cost, shorten significantly development cycle of round screw die, what realize round screw die effectively is homebred change make with repair. CNC Milling CNC Machining