{"id":25967,"date":"2014-12-08T01:22:00","date_gmt":"2014-12-07T16:22:00","guid":{"rendered":"https:\/\/kyowaseiko.co.jp\/jp\/?p=25967"},"modified":"2024-05-08T10:38:53","modified_gmt":"2024-05-08T01:38:53","slug":"technology03","status":"publish","type":"post","link":"https:\/\/kyowaseiko.co.jp\/world\/technology\/technology03.html","title":{"rendered":"Machining of hardened steel with cBN end millEndurance data"},"content":{"rendered":"\t\t
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Machining of hardened steel with cBN end mill<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Endurance data \u2013 Cutting test using cBN radius end mill<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Purpose of test<\/strong>
A cBN radius end mill was tested for slot machining in hard materials, which is a difficult process with conventional carbide end mills due to their machining inefficiency and limited tool life.<\/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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Test environment<\/td>\n<\/tr>\n
Machine<\/td>\nYBM-640V<\/td>\n<\/tr>\n
Work material<\/td>\nSLD(HRC60)<\/td>\n<\/tr>\n
Cutting fluid<\/td>\nOil mist<\/td>\n<\/tr>\n
Tool used<\/td>\ncBN radius end mill (\u03c61 \u00d7 R 0.1 \u00d7 6 (effective length)), manufactured by Kyowa<\/span><\/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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Test description<\/strong>
Cut slots 1 mm wide by 6 mm deep in a block measuring 80\u00d760\u00d730 mm, followed by visual evaluation at 200\u00d7 magnification.<\/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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Machining conditions<\/td>\n<\/tr>\n
Spindle rotational frequency<\/td>\n\uff1a18,000rpm\uff0856.5m\/min\uff09<\/td>\n<\/tr>\n
Feed speed<\/td>\n\uff1a500mm\/min\uff080.013mm\/tooth\uff09<\/td>\n<\/tr>\n
Cutting<\/td>\n:10 \u03bcm \u00d7 600 strokes per slot<\/td>\n<\/tr>\n
Cutting length<\/td>\n:80 mm \u00d7 600 strokes = 48000 mm (48 m) per slot<\/td>\n<\/tr>\n
Machining time<\/td>\n:1 h 42 min per slot<\/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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Test results<\/strong>
A cBN radius end mill was able to cut ten slots 1 mm wide by 6 mm deep by 80 mm long in a hard material. However, beginning with the fifth slot, traces of wear or chipping can be seen at the corners. The total cutting length attempted in this test was 48 mm \u00d7 10 slots = 480 mm, but a practical length is 48 mm \u00d7 4 slots = 192 mm. (Only one slot can be cut with a carbide end mill.) However, increasing the cutting speed (1.5 to 2 times faster) would provide more favorable conditions.<\/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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Data on fine machining of glass with ball end mill<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Table 1 Cutting conditions<\/td>\n<\/tr>\n
Workpiece<\/td>\nPyrex<\/td>\n<\/tr>\n
Tool<\/td>\ncBN, R0.2mm<\/td>\n<\/tr>\n
Feed rate<\/td>\n0.24mm\/min<\/td>\n<\/tr>\n
Axial depth of cut<\/td>\n20\u03bcm<\/td>\n<\/tr>\n
Rotation rate<\/td>\n20000rpm, 40000rpm, 60000rpm<\/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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Effects of rotational frequency and cutting oil on machined surfaces<\/td><\/tr>
Rotational frequency<\/td>Machined edge<\/td>Machined surface<\/td><\/tr>
20000rpm<\/td>\"\"<\/td>\"\"<\/td><\/tr>
40000rpm<\/td>\"\"<\/td>\"\"<\/td><\/tr>
60000rpm<\/td>\"\"<\/td>\u00a0<\/td><\/tr><\/tbody><\/table>\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":"

Cutting test using cBN radius end mill.<\/p>\n","protected":false},"author":1,"featured_media":25968,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[279,280],"class_list":["post-25967","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\/25967","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=25967"}],"version-history":[{"count":7,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts\/25967\/revisions"}],"predecessor-version":[{"id":99064,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/posts\/25967\/revisions\/99064"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/media\/25968"}],"wp:attachment":[{"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/media?parent=25967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/categories?post=25967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kyowaseiko.co.jp\/world\/wp-json\/wp\/v2\/tags?post=25967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}