{"id":22626,"date":"2024-05-24T17:41:12","date_gmt":"2024-05-24T09:41:12","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=22626"},"modified":"2024-06-11T10:14:36","modified_gmt":"2024-06-11T02:14:36","slug":"addressissues-and-tackle-them-boring-tool","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/pl\/addressissues-and-tackle-them-boring-tool\/","title":{"rendered":"Jak rozwi\u0105zywa\u0107 r\u00f3\u017cne problemy i radzi\u0107 sobie z nimi przy precyzyjnym wytaczaniu otwor\u00f3w wewn\u0119trznych?"},"content":{"rendered":"
Kt\u00f3ry jest najlepszy do precyzyjnego rozwiercania otwor\u00f3w wewn\u0119trznych? W\u0119glik spiekany czy HSS? Wybieramy ci\u0119cie z nisk\u0105 pr\u0119dko\u015bci\u0105 przy u\u017cyciu narz\u0119dzia do rozwiercania z w\u0119glika spiekanego. Narz\u0119dzia z w\u0119glika spiekanego zosta\u0142y wybrane ze wzgl\u0119du na doskona\u0142\u0105 odporno\u015b\u0107 na ciep\u0142o i zu\u017cycie, kt\u00f3ra rekompensuje niedoci\u0105gni\u0119cia narz\u0119dzi HSS. Przy niskich pr\u0119dko\u015bciach skrawania narz\u0119dzie z w\u0119glika spiekanego zachowuje trwa\u0142o\u015b\u0107 i ostro\u015b\u0107, zapobiegaj\u0105c wibracjom, ugi\u0119ciu i tworzeniu si\u0119 narost\u00f3w na kraw\u0119dziach. Zapobiega to powstawaniu sto\u017ck\u00f3w i falistych powierzchni w otworze wewn\u0119trznym, zapewniaj\u0105c precyzj\u0119 wymiarow\u0105 i chropowato\u015b\u0107 powierzchni oraz osi\u0105gaj\u0105c dobr\u0105 dok\u0142adno\u015b\u0107 kszta\u0142tu.<\/p>\n

Na jakie problemy mog\u0105 natrafi\u0107 narz\u0119dzia HSS podczas precyzyjnego rozwiercania otwor\u00f3w wewn\u0119trznych?<\/h1>\n

the resultant holes that machined by HSS tools at low speed gennerally have a lower surface roughness. Additionally, the small cuttings happens and results in longer machining times and lower efficiency, making HSS tools generally suitable only for finishing operations. To eliminate taper in the inner hole, switching to medium-speed cutting can be attempted, but this often leads to built-up edge formation on the tool’s rake face, increasing surface roughness and failing to meet the required surface finish. If a HSS tool is used at high speeds for precision boring, the poor heat and wear resistance of HSS causes rapid tool wear and insufficient tool strength, leading to tool deflection and difficulty in controlling dimensions. On the other hand, using a carbide tool at high speeds can result in poor tool rigidity and significant vibration, leading to a wavy surface on the inner hole, thereby affecting precision.<\/p>\n

\"narz\u0119dzie<\/p>\n

 <\/p>\n

Jak podej\u015b\u0107 do tych kwestii technicznych i jak sobie z nimi poradzi\u0107 podczas precyzyjnego rozwiercania otwor\u00f3w wewn\u0119trznych?<\/h1>\n

Projektowanie narz\u0119dzi<\/h2>\n

To achieve good precision in inner hole machining, it’s essential to reasonably select the type and grade of carbide tool, appropriate geometry, and suitable cutting parameters.<\/p>\n

1. Wyb\u00f3r rodzaju i gatunku w\u0119glika<\/h3>\n

Wybierz narz\u0119dzie do wytaczania z w\u0119glika wolframu i kobaltu, klasa YG8 (odpowiednik klasy ISO K20-K30). To narz\u0119dzie charakteryzuje si\u0119 wysok\u0105 wytrzyma\u0142o\u015bci\u0105, dobr\u0105 odporno\u015bci\u0105 na uderzenia i wibracje, a tak\u017ce nadaje si\u0119 do toczenia z nisk\u0105 pr\u0119dko\u015bci\u0105, co czyni je idealnym do precyzyjnego wytaczania.<\/p>\n

2. Wyb\u00f3r geometrii narz\u0119dzia<\/h3>\n

Dodatni k\u0105t natarcia (\u03bbs) dla ostro\u015bci;
\nK\u0105t g\u0142\u00f3wnej kraw\u0119dzi skrawaj\u0105cej (Kr) wynosz\u0105cy 93-96 stopni w celu zmniejszenia si\u0142y promieniowej;
\nK\u0105t natarcia (\u03b30) i k\u0105t przy\u0142o\u017cenia (\u03b10), oba wynosz\u0105ce 6 stopni, poprawiaj\u0105 ostro\u015b\u0107 i zmniejszaj\u0105 deformacj\u0119 ci\u0119cia;
\nK\u0105t wt\u00f3rnej kraw\u0119dzi skrawaj\u0105cej (Kr) wynosz\u0105cy 6 stopni w celu zminimalizowania chropowato\u015bci powierzchni.<\/p>\n

\"\"<\/p>\n

3.Podstawy i analiza wyboru geometrii narz\u0119dzia rozwiercaj\u0105cego<\/h3>\n

K\u0105t natarcia to k\u0105t mi\u0119dzy g\u0142\u00f3wn\u0105 kraw\u0119dzi\u0105 skrawaj\u0105c\u0105 a p\u0142aszczyzn\u0105 podstawy. Dodatni k\u0105t natarcia sprawia, \u017ce narz\u0119dzie do wytaczania jest ostre, co zmniejsza op\u00f3r skrawania ze wzgl\u0119du na ma\u0142y dodatek na obr\u00f3bk\u0119 podczas wyka\u0144czania.
\nThe main cutting edge angle is the angle between the main cutting edge’s projection on the base plane and the feed direction. It directly affects the radial force. A smaller angle increases tool tip strength, while a larger angle reduces radial force. Hence, an angle of 93-96 degrees is chosen to reduce radial force and facilitate cutting of stepped surfaces in the inner hole.
\nThe rake angle, typically 5-20 degrees, improves boring tool sharpness and reduces cutting force. However, increasing the rake angle decreases cutting edge strength. During finishing, a larger rake angle is chosen to ensure sharpness. The relief angle, between 3-12 degrees, reduces friction between the tool’s relief face and the workpiece.
\nThe secondary cutting edge angle, 6-8 degrees (6 degrees in this case), reduces surface roughness by minimizing the angle between the secondary cutting edge’s projection and the feed direction.<\/p>\n

4. Wyb\u00f3r parametr\u00f3w ci\u0119cia<\/h3>\n

Na podstawie charakterystyki narz\u0119dzia testy wykaza\u0142y, \u017ce pr\u0119dko\u015b\u0107 skrawania w przypadku precyzyjnego rozwiercania otworu wewn\u0119trznego ze stali w\u0119glowej wynosi
\n\u03a645 wynosi oko\u0142o 25 m\/min (pr\u0119dko\u015b\u0107 przedmiotu obrabianego oko\u0142o 180 obr.\/min), przy g\u0142\u0119boko\u015bci ci\u0119cia a wynosz\u0105cej 0,05\u20130,10 mm i szybko\u015bci posuwu f wynosz\u0105cej 0,2 mm\/obr.<\/p>\n

 <\/p>\n

Funkcje korzystania z tego narz\u0119dzia<\/h2>\n

Using a chip-breaking tool for inner hole precision boring ensures that the small finishing allowance doesn’t affect the surface roughness;<\/p>\n

Wi\u0119kszy k\u0105t g\u0142\u00f3wnej kraw\u0119dzi skrawaj\u0105cej zmniejsza si\u0142\u0119 skrawania promieniowego i wibracje;<\/p>\n

Wi\u0119ksza \u015brednica uchwytu narz\u0119dzia do wytaczania zapewnia wystarczaj\u0105c\u0105 sztywno\u015b\u0107, zapobiegaj\u0105c drganiom i falisto\u015bci powierzchni powodowanej przez niewystarczaj\u0105c\u0105 sztywno\u015b\u0107 narz\u0119dzia.<\/p>\n

\"\"<\/p>\n

\u015arodki ostro\u017cno\u015bci podczas stosowania narz\u0119dzi do wytaczania z w\u0119glik\u00f3w spiekanych do precyzyjnego wytaczania<\/h2>\n

Before precision boring, ensure a machining allowance of 0.08-0.12mm and a surface roughness around Ra3-2. If the allowance is too small, finishing won’t remove rough machining marks; if too large, cutting resistance increases, reducing hole precision.
\nNarz\u0119dzie nadaje si\u0119 wy\u0142\u0105cznie do obr\u00f3bki wyka\u0144czaj\u0105cej, nie zgrubnej.
\nPodczas obr\u00f3bki nale\u017cy unika\u0107 uderzania narz\u0119dzia w powierzchnie stopniowane. Chocia\u017c w\u0119glik jest twardy i odporny na zu\u017cycie, jest kruchy i nieodporny na uderzenia. Dlatego nale\u017cy pracowa\u0107 ostro\u017cnie, prze\u0142\u0105czaj\u0105c si\u0119 na posuw r\u0119czny 2-3 mm przed \u017c\u0105dan\u0105 g\u0142\u0119boko\u015bci\u0105 otworu, aby uzyska\u0107 wymagan\u0105 g\u0142\u0119boko\u015b\u0107 dok\u0142adnie.<\/p><\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Which is best for precision boring inner holes? Carbide or HSS? We opt for low-speed cutting using a carbide offset boring tool. Carbide tools were chosen for its excellent heat and wear resistance, which compensates for the shortcomings of HSS tools. At low cutting speeds, the carbide tool maintains durability and sharpness, preventing vibration, deflection,…<\/p>","protected":false},"author":2,"featured_media":22629,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[92],"tags":[],"class_list":["post-22626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cutting-tools-weekly"],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2024\/05\/u33777039383198669575fm253fmtautoapp138fJPEG.webp.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts\/22626","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/comments?post=22626"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts\/22626\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/media\/22629"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/media?parent=22626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/categories?post=22626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/tags?post=22626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}