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Understanding the application and being aware of common challenges can help make a difficult operation both productive and profitable
The global drilling tools market was valued at USD 5.79 Billion in 2016 and is expected to grow at a CAGR of 4.75%, during the forecast period, to reach USD 8.61 Billion by 2022.* Producing deep holes in an effective and efficient way is considered a challenging application. Cutting tool manufactures need to provide their customers with a product that has predictable tool life, accurate surface finish and repeatability at a good price to be competitive in the market. Thomson Mathew, ANCA Product Manager explains the different types of cutting tools for this application and how to overcome some common challenges in deep hole drilling.
Thomson Mathew starts: Deep hole drilling is a process to produce holes in metal at high depth-to diameter ratios on CNC Machines. For normal drilling processes, the length to diameter ratio will be less than five times the diameter and if the length to diameter ratio goes beyond five, the process is called deep hole drilling. This can be effective in diameters ranging from 1mm – 200mm [0.04in – 8.00 in] and will require special drills with through coolant holes to deliver high pressure coolant to evacuate chips cleanly and achieve hole tolerances and surface finish.
Some common deep hole drilling process include gun drilling, BTA drilling (Boring and Trepanning Association) and conventional carbide twist drills. All these processes have their own merits in deep hole drilling based on hole diameter and tolerances.
BTA drilling is an effective method of drilling deep holes, as it is cleaner, reliable and capable of achieving larger diameters at higher feed rates. BTA drilling is effective in holes from 20 – 200 mm [0.80 – 8.00 in], a larger size range than gun drilling and carbide twist drills.
Through coolant or internal coolant – This improves chip evacuation while cooling the cutting edge. Coolant is flushed down to the bottom of the hole, which, in turn, is pushing the chips back up toward the top. ANCA software has the ability to design and verify the coolant holes right at the design stage to avoid coolant hole breakage into flutes and eliminating scrap.
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ANCA is a market leading manufacturer of CNC grinding machines. It was founded in 1974 in Melbourne, Australia where the company still has its global headquarters. ANCA has offices in the UK, Germany, China, Thailand, India, Japan, Brazil and the USA as well as a comprehensive network of representatives and agents worldwide.
ANCA CNC grinders are used for manufacturing precision cutting tools and components across a diverse range of competitive industries including cutting tool manufacture, automotive, aerospace, electronics and medical.