钻头培训TDM drill training(2).ppt

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1、DRILLING,BASIC NOMECLATURE ROTATING TOOLS.Training for Salesengineer,Harald Preusser,Twist drill made by P.Cook,1770,40%of all metal cutting operations are drilling operations40%的金属切削操作是钻削作业,Drive movements.,Back taper.,Web taper.,Plain cylindrical,Morse taper,Standard shank,Different drill shanks.,

2、Clearance angle.,10%of diameter,Form A Web thinning,Form B,Form C Split point,Form D Cast Iron,Form E Centre point,E,K,Form U,Form U,Form UV,Drill points.,整体硬质合金钻头刃口结构,regroundto 140,point anglenormal 118,regroundto 90,Main cutting edge design for reground twist drills.,Typ Ngeneralpurpose,Typ Hbrit

3、tlematerials,Typ Wsoftmaterials,Basic drill types.,Profile of a twist drill.,Flute geometry.,Flute profiles.,Graph for pecking cycles.,Drilling with bushings.,d2=d1+0,5.1,d1,90.130,Step drill for machining with minimum burr formation.,60-70%30-40%,Axial forces.,The influence of tip-angle on the cutt

4、ing forces.,The drilling process-flute form and rake.,Basic cutting tool geometry.,Neg.,Corr.,Pos.,hard materials,heat treated materials,soft materials,hard materials,Rake angle.,Insufficient clearance causes the drill to rub behind the cutting edge.It will make the drill work hard,generate heat and

5、 increase axial thrust.Results in poor hole quality and drill breakage.,Excessive clearance results in lack of support behind cutting edge with quick dulling and poor toollife despite initial free cutting action.Clearance angle behind cutting tip for general purposes is 8-12 average.,Influence of cl

6、earance on performance.,Metal,Composites,Non-Metallics,Materials.,Structuralsteels,Constructionalsteels,High grade steels,Unalloyed con-structional steelsGeneral structural steelswith Rm 0.55%C orRm 700 N/mm2(102,000 psi)Alloyed steel,Unalloyed high grade steelsStructural steels with 0.5%CTool steel

7、s 1.to 3.gradeAlloyed high grade steelsStructural steels,wear-resistant andbearing steelsTool steels,HSSCorrosion resistant steels,stainless and heat-resisting steels,Steel grades.,Corrosion-and acidproof steels,Heat-treatable steels,Structural components of high stress,Spring steels,High elasticity

8、 springs and components,Wear resistant steels,Earth-moving equipment,armour plate,Tool steels,Cutting-,punch-,die-and forming tools,Super alloys,Turbines,nuclear power plants,military,medical,Titanium alloys,Aircraft-and space industry,motors,medical/dental,Special alloys(i.e.bronzed)and light metal

9、 alloysof high toughness,Special purposes,Special Materials and their Application.,Spectrum of Materials,B9_091_E.ppt,50454035302520151050,0 150 300 450 600 750 900 1050 1200 1350 1500 1700 1850,Tensile Strength Rm N/mm2,Elongation A5%,AlSi,Cast Iron(GG/GGG),Steels up to 1000 N/mm2,Steels up to700 N

10、/mm2,High tensile steels,Clearance wear,Land wear,Crater wear,Metal-cutting conditions are ok.,Forms of wear.,Feed excessive进给太大,Chisel edge deformed横刃的变形,Forms of wear.,Cutting speed too high切削速度太高,Extreme land wear,Burnt cutting edges,Forms of wear.,Excessive feed or incorrect drill geometry,Build

11、-up edges,Pushed swarf,Forms of wear.,Possible Causes:Feed rate too high Tool is pushing not cutting Spindle speed is too lowPossible solutions:Decrease feed rate Decrease hone width Increase rpm,Trouble Shooting:Chisel edge wear,B8_224_E.ppt,Cratering on Cutting Edge,Possible Causes:Feed rate too h

12、igh Lip relief too large Improper or no coating Spindle too slowPossible solutions:Decrease feed rate Decrease clearance angle Select proper coating Increase rpm,Trouble Shooting:Cutting Edge Cratering,B8_225_E.ppt,Possible Causes:Insufficient back taper Tool run-outPossible solutions:Increase back

13、taper Check tool set-up for run-out,Trouble Shooting:Margin Wear,B8_226_E.ppt,Possible Causes:Spindle speed to slow Hone width to largePossible solutions:Increase rpm Decrease hone width,Trouble Shooting:Cutting edge build up,B8_227_E.ppt,Wear&Cause,B8_228_E.ppt,Wear&Cause,B8_229_E.ppt,Diameter Mate

14、rial Drilling depth Tool type,Recommended cutting data for drilling.,Oil feed,Internal coolant supply.,MegaJet vs.Twist drill withexternal coolant,Type of hole:Through holeDiameter:12.2 mm(.48)Depth:30 mm(1.18)Material:1.2713=55NiCrMoV6V(toolsteel L6)Rm=970 N/mm2(141.000 psi)Coolantpressure:10 bar(1

15、42 psi),vc=37 m/min(SFM 122)f=0.2 mm/rev(.0078 inch/rev),vc=42 m/min(SFM 138)f=0.3 mm/rev(.0118 inch/rev),0 200 400(0)(7.87)(15.78),Twist drill DIN 1897TIN-coated,A 6292 TINMegaJet,60(197)50(164)40(131)30(98)20(66)10(33)0,Tool life m(feet),0 200 400(0)(7.87)(15.78),Feed ratemm/min(IPM),Case study,50

16、0450400350300250200150100500,Number of drilled holes,MaximumAverageMinimum,Cutting test data comparison of ground/rolled versions.,ALPHA Series,Solid Carbide High-Performance-Drill with Special Flute-and Tip-geometry for Drilling of steel*,140 1,Tip Geometry of Solid Carbide High-Performance-Drill A

17、LPHA 2/4,of different short holedrilling toolsdia.12 mmin material 31NiCr14Rm=970 N/mm2(tensile strength)280 HB,600500400300200100,Feed rates mm/min,Tool A1211 A1148 A1149TiN A1166 A1164,v m/min 20 25 35 90 90,f mm/rev 0.2 0.25 0.3 0.2 0.25,Typical feed rates,Solid Carbide Drill AlphaJet,115,Carbide

18、 Tipped Twist Drill DIN 8037,3-Flute,Solid Carbide High-Performance-Drills withSpecial Tip Geometry,OAL to DIN 1897 or 6537 L,K 2167 K30FK 2167 K30F,K 30 FK 30 F,=DIN 1897=DIN 1897,Cast iron materials,Al-alloysSteels,Step drills,A 1166 K30FA 1166 K30FA 1166 TINA 1167 AA 1167 BA 1168A 3967,K 30 FK 30

19、 FK 30 FK 30 FK 30 FK 30 FK 30 F,TIN,DIN 1897 DIN 1897 DIN 1897 DIN 1897 DIN 1897=DIN 1897=DIN 6537L,Titanium,Ni and Co based super alloysSteels,especially high strength series Cast iron materials,brittle AlSi-alloysWrought Al-alloysTitanium,Ni and Co based super alloys Al-alloys,cast iron materials,non-ferrous metals,Cat.no,Carbidegrade,Coating,Flutelength,Application range,Maximiza Series,MAXIMIZA,3-Flute Bore Drill,