{"id":674,"date":"2024-12-20T16:49:00","date_gmt":"2024-12-20T08:49:00","guid":{"rendered":"https:\/\/www.amedrillsupply.ca\/?p=674"},"modified":"2025-08-25T23:48:01","modified_gmt":"2025-08-25T15:48:01","slug":"failure-analysis-of-thread-button-bits","status":"publish","type":"post","link":"https:\/\/www.amedrillsupply.ca\/fr\/failure-analysis-of-thread-button-bits\/","title":{"rendered":"Tout sur l'analyse de d\u00e9faillance des bouts de filet"},"content":{"rendered":"

1. Body Wash<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Drilling under extremely abrasive conditions<\/p>\n\n\n\n

– Overwhelming flushing volume<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Reduce flushing volume<\/p>\n\n\n\n

– Slow drill rotation to create larger cuttings for more effective flushing<\/p>\n\n\n\n

– Use drilling foam to assist in the removal of rock cuttings<\/p>\n\n\n\n

– Regularly clean the drill holes<\/p>\n\n\n\n

2. Skirt Ring Off<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Misalignment due to hole deviation<\/p>\n\n\n\n

– Improper feed pressure<\/p>\n\n\n\n

- Fatigue de l'acier<\/p>\n\n\n\n

– Worn, broken, or mismatched threads<\/p>\n\n\n\n

– Excessive rotational forces from operating with dull carbides<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Lower percussion and feed during the initial drilling (collaring)<\/p>\n\n\n\n

– Use alignment tools and improve drilling practices for a straighter hole; Use bits with a drop center face design and\/or a retract body<\/p>\n\n\n\n

– Regularly sharpen dull carbides<\/p>\n\n\n\n

– Avoid striking the external bit body<\/p>\n\n\n\n

– Reduce the power of impacts<\/p>\n\n\n\n

\"Body
Body Wash<\/figcaption><\/figure>\n\n\n\n

3. Split Skirt<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

- D\u00e9salignement d\u00fb \u00e0 la d\u00e9viation du trou<\/p>\n\n\n\n

–  Loose thread joints during drilling<\/p>\n\n\n\n

– Drilling with excessively worn threads<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Use alignment tools and improve drilling practices for a straighter hole<\/p>\n\n\n\n

– Use bits with a drop center face or retract body<\/p>\n\n\n\n

– Change worn out components of the drill string<\/p>\n\n\n\n

– Ensure thread joints are securely tightened before percussion<\/p>\n\n\n\n

4. Steel Crack on Bit Face<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Excessive feed force<\/p>\n\n\n\n

– Use dull carbides for drilling<\/p>\n\n\n\n

– Manufacturing error, inferior buttonhole-drilling precision<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Adjust feed force to match rock conditions<\/p>\n\n\n\n

– Regularly sharpen dull carbides<\/p>\n\n\n\n

– Return bit for detailed analysis<\/p>\n\n\n\n

\"Split
Split Skirt<\/figcaption><\/figure>\n\n\n\n

5. Carbides Pop-Out<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

- Pression d'alimentation insuffisante<\/p>\n\n\n\n

– Incorrect size match between button and buttonhole<\/p>\n\n\n\n

– Excessive grinding of the bit body<\/p>\n\n\n\n

– Drilling in very soft or extremely abrasive conditions<\/p>\n\n\n\n

– Free hammering<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Increase feed pressure<\/p>\n\n\n\n

– Adhere to the correct carbide sharpening process to prevent excessive bit body grinding. Replace worn-out bits.<\/p>\n\n\n\n

– Commence full percussion only when the bit is in complete contact with rock<\/p>\n\n\n\n

6. Snake Skin or Micro-Cracks in Carbide<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Drilling in non-abrasive rock such as limestone, leading to micro-fractures in the carbide, and it looks like snakeskin.<\/p>\n\n\n\n

– Incorrect intervals of carbide grinding<\/p>\n\n\n\n

– The rock leaves a shiny surface on the buttons and a fatigue in the surface of the cemented carbide, leading to button failure<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Shorten grinding intervals when drilling in non-abrasive<\/p>\n\n\n\n

rock<\/p>\n\n\n\n

– Sharpen carbides upon dullness or the appearance of micro-cracks, following proper procedures<\/p>\n\n\n\n

– Regular inspection of carbides<\/p>\n\n\n\n

– Use a softer carbide grade<\/p>\n\n\n\n

\"Carbides
Carbides Pop Out<\/figcaption><\/figure>\n\n\n\n

7. Carbide Chipped & Carbide Cracked<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Overdrilling of the bit<\/p>\n\n\n\n

– Drilling in non-abrasive rock causes a shiny surface on the buttons<\/p>\n\n\n\n

– Improper grinding intervals<\/p>\n\n\n\n

– Too hard a carbide grade for the rock condition<\/p>\n\n\n\n

– Button not making contact with virgin material on impact<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Reduce intervals between grinds. Regrind when wear flats reach a maximum of 1\/3 of the button diameter<\/p>\n\n\n\n

– Regularly inspect and grind bits to eliminate surface micro-cracks on the carbides<\/p>\n\n\n\n

– Select an appropriate hardness of the carbide for the drilling application<\/p>\n\n\n\n

– Do not initiate percussion until the bit is in full contact with the rock<\/p>\n\n\n\n

8. Carbides Crashed Down to the Level of the Bit Body & Carbides Crashed Inside the Bit Body<\/h2>\n\n\n\n

Causes probables :<\/p>\n\n\n\n

– Overdrilling in non-abrasive rock such as limestone, leading to micro-fractures in the carbide, and it looks like snakeskin.<\/p>\n\n\n\n

– Excessive carbide protrusion due to poor grinding practices<\/p>\n\n\n\n

– Incorrect grinding intervals<\/p>\n\n\n\n

– Unsuitable carbide grade<\/p>\n\n\n\n

Actions sugg\u00e9r\u00e9es :<\/p>\n\n\n\n

– Shorten the intervals for grinding when drilling in non-abrasive rock<\/p>\n\n\n\n

– Regularly inspect and grind the bits, although the buttons may not appear worn, just polished, to lessen micro-cracks on the carbide surface<\/p>\n\n\n\n

– Use wet grinding to avoid snake gue.<\/p>\n\n\n\n

– Choose a suitable grade of carbide<\/p>\n\n\n\n

\"Carbide
Carbide Chipped Carbide Cracked<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"

D\u00e9couvrez les d\u00e9faillances courantes des m\u00e8ches \u00e0 bouton filet\u00e9, telles que l'\u00e9clatement du carbure et les fissures de l'acier, et apprenez \u00e0 les \u00e9viter gr\u00e2ce \u00e0 des pratiques de forage et d'entretien ad\u00e9quates.<\/p>","protected":false},"author":1,"featured_media":6719,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-674","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-drill-college"],"_links":{"self":[{"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/posts\/674","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/comments?post=674"}],"version-history":[{"count":4,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/posts\/674\/revisions"}],"predecessor-version":[{"id":7503,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/posts\/674\/revisions\/7503"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/media\/6719"}],"wp:attachment":[{"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/media?parent=674"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/categories?post=674"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.amedrillsupply.ca\/fr\/wp-json\/wp\/v2\/tags?post=674"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}