{"id":25925,"date":"2014-12-08T18:17:22","date_gmt":"2014-12-08T09:17:22","guid":{"rendered":"https:\/\/kyowaseiko.co.jp\/jp\/?p=25925"},"modified":"2024-05-08T10:32:54","modified_gmt":"2024-05-08T01:32:54","slug":"proposal03","status":"publish","type":"post","link":"https:\/\/kyowaseiko.co.jp\/world\/technology\/proposal03.html","title":{"rendered":"Advantages of cBN tools in hardened steel machining"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\u713c\u5165\u308c\u92fc\u52a0\u5de5\u306b\u304a\u3051\u308bcBN\u5de5\u5177\u306e\u512a\u4f4d\u6027\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Advantages of cBN tools in hardened steel machining<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Proper cutting work<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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requires a tool that is three times harder than the work material!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Characteristics of cBN end mill<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Characteristics\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Concept of cBN end mill<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Innovation from electrical discharge machining to direct milling<\/span><\/strong><\/p>

  • Reduced delivery time Example: Previously, 5 days for mold designing + 5 days for electrode processing + 5 days for electrical discharging\/finishing, or 15<\/strong><\/span> days in total. Presently, 5 days for mold designing + 1 day for direct milling, or 6<\/strong><\/span> days in total.<\/li>
  • Reduced cost (75%<\/strong><\/span> reduction in power consumption, and no need for electrode fabrication) \u2192 Resource savings<\/strong><\/span><\/li>
  • No drain from electrical discharge machining (0<\/strong><\/span> \u2192 Eco-friendly<\/strong><\/span>)<\/li><\/ul>

    Cuts two times faster and lasts five times longer than carbide-coated tools.<\/strong><\/span><\/p>

    • Reduced machining time<\/li>
    • Fewer changes of tools during long period of cutting<\/li>
    • Less time for polishing process<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Direct milling vs. electrical discharge machining\u200b<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Workpiece<\/td>\nBevel gear cavity (60\u00d760\u00d750)<\/td>\n<\/tr>\n
      Work material<\/td>\nDC53 (HRC60)<\/td>\n<\/tr>\n
      Processing machine<\/td>\nYasuda Precision Tools YBM640V<\/td>\n<\/tr>\n
      Cutting fluid<\/td>\nOil mist (cBN for dry machining)<\/td>\n<\/tr>\n
      Tools used<\/td>\nFive carbide end mills, eight R1s, one cBN end mill<\/td>\n<\/tr>\n
      Machining description<\/td>\nMachining test by direct milling with carbide tools and cBN tool. (Time and surface roughness compared with conventional electrical discharge machining)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Cutting conditions<\/td>\n<\/tr>\n
      Machining process<\/strong><\/td>\nTool used<\/strong><\/td>\nRotational frequency <\/strong> (min\u22121)<\/td>\nFeed<\/strong> (mm\/min)<\/td>\nMachining time<\/strong> (min)<\/td>\n<\/tr>\n
      Prepared hole machining<\/td>\nCarbide R5 ball end mill<\/td>\n600<\/td>\n240<\/td>\n7.4<\/td>\n<\/tr>\n
      Roughing<\/td>\nCarbide \u03c610 end mill<\/td>\n4,000<\/td>\n2,500<\/td>\n6.2<\/td>\n<\/tr>\n
      Semi-roughing<\/td>\nCarbide R3 ball end mill<\/td>\n5,000<\/td>\n1,200<\/td>\n19.0<\/td>\n<\/tr>\n
      Semi-finishing<\/td>\nCarbide R1.5 ball end mill<\/td>\n8,500<\/td>\n2,000<\/td>\n36.1<\/td>\n<\/tr>\n
      Semi-finishing<\/td>\nCarbide R1.0 ball end mill<\/td>\n15,000<\/td>\n2,400<\/td>\n28.5<\/td>\n<\/tr>\n
      Final finishing<\/td>\ncBN R1.0 ball end mill<\/td>\n20,000<\/td>\n2,000<\/td>\n50.3<\/td>\n<\/tr>\n
      Prepared hole machining<\/td>\nCarbide R5 ball end mill<\/td>\n600<\/td>\n240<\/td>\n7.4<\/td>\n<\/tr>\n
      Roughing<\/td>\nCarbide \u03c610 end mill<\/td>\n4,000<\/td>\n2,500<\/td>\n6.2<\/td>\n<\/tr>\n
      Semi-roughing<\/td>\nCarbide R3 ball end mill<\/td>\n5,000<\/td>\n1,200<\/td>\n19.0<\/td>\n<\/tr>\n
      Semi-finishing<\/td>\nCarbide R1.5 ball end mill<\/td>\n8,500<\/td>\n2,000<\/td>\n36.1<\/td>\n<\/tr>\n
      Semi-finishing<\/td>\nCarbide R1.0 ball end mill<\/td>\n15,000<\/td>\n2,400<\/td>\n28.5<\/td>\n<\/tr>\n
      Final finishing<\/td>\ncBN R1.0 ball end mill<\/td>\n20,000<\/td>\n2,000<\/td>\n50.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Conclusion:
      <\/strong>Approx. 10 h with conventional method (electrical discharge machining + polishing) vs. approx. 2.5 h with direct milling method<\/strong><\/span>
      This translates to a 75% reduction in time<\/strong>.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      Features of our CBN tool: Electrolytic abrasive grain polishing\u200b<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Unprocessed product (Grinding stone traces are seen, with the likelihood of causing surface accuracy deterioration and chipping.)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\tProcessed product (The smooth cutting edge provides high accuracy and long life.)\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

      Advantages of cBN tools in hardened steel machining.<\/p>\n","protected":false},"author":1,"featured_media":25926,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[279,280],"class_list":["post-25925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","tag-cbn","tag-280"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts\/25925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/comments?post=25925"}],"version-history":[{"count":7,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts\/25925\/revisions"}],"predecessor-version":[{"id":99052,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts\/25925\/revisions\/99052"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/media\/25926"}],"wp:attachment":[{"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/media?parent=25925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/categories?post=25925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/tags?post=25925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}