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The tungsten carbide substrate must have a low cobalt content, such as 6%,dth drilling hammer, and must have a specific surface treatment. This treatment reduces the cobalt content of the outer layer, exposing the edges of the diamond to create sufficient adhesion between the diamond coating and the substrate. In the following table, two types of comparisons are summarized: Expand the full text In order to prove the comparison of types more vividly, let's listen to the different applications of these two kinds of diamond tools: Application of PCD or CVD in Milling The milling operation involves intermittent cutting of the material, with each end mill tooth in contact with the material and exiting in one tool revolution. Each time the cutting edge enters the material,overburden drilling systems, the "hammering" effect damages the cutting edge of the tool. From the above table, PCD tools are more likely to withstand the "hammering" effect in milling. In CVD diamond coated tools, the CVD coating will eventually delaminate, leaving only the tungsten carbide substrate. In PCD, even if some fracture occurs, the diamond is solid and therefore maintains the same characteristics. However, there is a concern about the geometric limitations of PCD. For example, CVD diamond tools are advantageous when a particularly long slot length is required, Borehole Drill Bits ,dth button bits, or when a particular tool geometry is required. Application in PCD or CVD Drilling In drilling operations, the cutting edge is in constant contact with the material, unlike in milling, so the cutting edge is less likely to notch or break. With this in mind, combined with hardness and sharpness, CVD diamond bits are better at minimizing delamination at the hole exit. Valin Superhard offers solutions for PCD and CVD diamond drill bits, end mills, milling cutters for customers' composite applications. Pay attention to the author to learn more about industry consulting! Return to Sohu to see more Responsible Editor: (function() { function getBrandHtml() { var brands = [],dhd drill bit, html = ''; for(var i = 0; i < brands.length; i++) { var brand = brands[i]; if(brands.length i+1) { html+= ''+brand.name+''; } else { html+= ''+brand.name+'、'; } } return html; }; if(document.getElementById('linkBtn')){ document.getElementById('linkBtn').onclick = function() { $('#brands').removeClass('brand');$ ( '# tipInfo').text ( 'Real name responded'); $ ('#linkBtn').remove();$ ('.real-response .content').css('line-height', '20px');$ ('.real-response .time').css('line-height', '20px'); }; document.getElementById('brands').innerHTML = getBrandHtml(); }; })();。 wt-dthtools.com