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- れいな だいほうじ
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1 Start a revolution in manufacturing! New generation of cold work die steel
2 New Generation of Cold Work Die Steel to Support the Japanese Manufacturing Improved service life of die good toughness (tempering:500) 1 Outstanding surface treatment characteristics Designed to get to 62HRC, which guratantees that the surface coating is hard to peel off against high load The coating is hard to peel off Outstanding surface treatment characteristics improves coating adhesion film pressure, leads to longer service life of die Existing SKD11 film cracks and peels off hard 2 Exceptional toughness Improves toughness twice and higher than that of SKD11, which extends the service life of die by solving the problem caused by cracking. Characteristics of Hard to crack hard to crack carbide Existing cracks are produced good 3 Excellent dimensional change characteristics Around 50% lower in dimentional change and directional variation than SKD11 and reduces the number of finishing process. Improved die manufacturing efficiency machinability Less bend No correction Need correction Existing Service life of Die dimentional change good Ease of die manufacturing 4 Superior machinability Improves machinability twice and higher than that of SKD11 and saves time and cost for die making. Comparison of characteristics 8% Cr Steel improved 8% Cr Steel Wear Resistance Toughness Fatigue Dimensional change caracteristics Machinability Easy to machine machines smoothly carbide chipping Existing chips are poduced. o2 o3
3 Causes of damages and the measures Galling The suraface coating doesn't adhere enough to the material. The material is insufficient in strength. Deform of the material and the low adhesion between the material and the coating causes peeling of the surface coating and galling. Galling with its excellent charcteristics of surface treatment is highly recommended. Scratch Test Results Principles of scratch test Vertical load Diamond indenter Test piece Test movement direction Scratch Conditions realizes high of 62HRC, harder than that of SKD11 Improves indenter:diamond 0.2R adhesion with the surface coating In comparison with SKD11,the coating starts to peel off under the 1.8 time heavier load. load:020kgf speed:10mm/min load change:20kgf/min surface treatment:ks-g Load improves withstanding of load Load when film starts to peel off Load to which the material was exposed Abrasion The material is insufficient in abrasion resistance. Abrasion resistance is affected by carbides. Less carbides facilitates abrasion. abrasion with its outstanding abrasion reisistance is highly recommended. The carbide control technique enables high abrasion resistance equivalent to that of SKD11 Ogoshi-type Abrasion Test results test machine:ogoshi-type abrasion tester friction speed:2.37m/s friction distance:400m final load:p6.3kgf comparative abrasion quantity Abrasion resistance is improved Cracking The material is insufficient in toughness. A lot of rough carbides and debris weaken the toughness of the material and produce crackings. Cracking with its exceptional toughness is highly recommended. With lower rough carbides, has around 1.3 times higher toughness in spite of its high of 62 HRC compared with 60HRC of SKD11. Charpy Impact Test Charpy Impact Value 10R notch Toughness is improved Chipping The material is insufficient in fatigue resistance characteristics. Carbides in the material weaken the strength (fatigue resistance characteristics) and cause chipping Chipping with its superior fatigue resistance characteristics is highly recommended. Reduces large size carbides and improves the fatigue limit*1 around 1.4 times higher and the servis life under the high stress around 5 times longer. A limit point of stress amplitude With the stress below, no matter how *1 fatigue limit many times the material is tried, it will never be broken. Ono-type rotating bending test results stress Fatigue limit is improved Fatigue service life is improved Cycles o4 o5
4 Technical data enables heat treatment under the same heat treatment conditions of SKD11,and gets high of 62HRC. dimension: mm quenching(gas cooling): min tempering:t 180min Tempering temperature recommended conditions quenching queching standard heat time 100mm and less 100mm and more tempering air blast cooling gas cooling Tempering temperature air cooling oil cooling tempering temperature high-temperature tempering low-temperature tempering realised the highest level of machinability for cold work die steel,which saves the time for die machining. Cutting speed (Annealed Material) 2 times Machinability by rapid feed radius cutter Machining quantity Machine:MC(BT50,7.5kw) Tool:MITSUBISHI AJX148503SA42Sφ50 Tip:JOMW140520ZDSR-FT VP15TF Feed:1.0mm/blade Depth of cut:ad1mm,rd35mm Protrusion length:80mm Cutting fluid:air blow Service life: tool abrasion, chipping Number of drilling positions over 5 times Drilling 8% Cr steel improved 8% Cr sttel Machine: MCBT405.5kw Tool: MITSUBISHI K-TD14.1mm Cutting speed:22m/min Feed:0.15mm/rev Hole depth:98.7mm7d Step:3mm Cutting fluid:emulsion Judgment of service life: Creaking noise, folding has small amount of dimensional change and anisotropy,and reduces the number of finishing process. Dimentional change dimension: mm quenching(gas cooling): min tempering:t 180min Dimentional change ratio Tempering temperature Anisotropy of dimentional change dimension: mm quenching(gas cooling): min tempering: min Dimentional change ratio Tempering temperature Tool abrasion quantity SKD11 Ball end milling 2 times Machining length Machine:MCBT405.5kw) Tool: MITSUBISHI SRFH30S32M Tip: MITSUBISHI SRFT30 VP15MF Revolution:2650min -1 Feed:1660mm/min Depth of cut:ad0.3mmrd0.7mm Protrusion length:118mm Cutting fluid:air blow Cutting direction:down Cutting (Quenched & tempered material) Tool service life distance 3 times SKD11 8% Cr steel improved 8% Cr sttel End milling Machine:MC(BT40,5.5kw) Tool:MITSUBISHI VC-MD 10mm Cutting speed: 150m/min4800rpm -1 Feed:0.1mm(2,900mm/min) Depth of cut:ad10mm,rd0.5mm Cutting direction:down Cutting Protrusion length:25mm Cutting fluid:air blow has the quantity of secular change equivalent to that of KD11. dimensional change ratio days Test dimension: mm Conditions quenching gas cooling): min tempering: min enables welding under the same welding conditions of SKD11.It has lower welding sensitivity than SKD11, reducing cracking troubles caused by welding. Cold work die steel is higher in welding crack sensitivity because of the high carbon and the chrome So please make sure that preheating and postheating are properly done in welding. *A welding rod of SKD61 material or equivalent is recommended. Arc welding rod : JIS: DF2B-B, DF3C-B TIG welding rod : Please ask us about it because models differ by the manufacurers. No Crack Crack is produced Welding Conditions Welding rod:tm-10b 4.0 Number of layers:3 layers TP dimension: 98t 103w 200mm (welding range:50 150mm) Welding current:160a Peening done Without postheating Thermal conductivity ratio Heat treatment conditions quenching(gas cooling): min tempering: min Coefficient of thermal expansion o6 o7
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