Discussion on the Difference between Diamond PCD and CVD Cutting Tools _ Drill Bit _ Application _ Valin Super

Original title: Discussion on the difference between diamond PCD and CVD cutting tools Through this article, Valin Superhard tries to explain

Original title: Discussion on the difference between diamond PCD and CVD cutting tools Through this article, Valin Superhard tries to explain the problems faced by most users who process composite materials and cutting tools, and to solve the problem of not knowing how to choose the right cutting tools when processing. Composite cutting tools fall into two main product categories: PCD tools, where the cutting edge is made up of PCD segments of a specific size and shape, and CVD diamond coated tools, where the edge is completely built up in a grinding operation and subsequently coated with CVD diamond. PCD (Polycrystalline Diamond Tool) PCD (polycrystalline diamond), unlike single crystal diamond, is synthesized by the aggregation of many diamond particles, typically between 2 and 30 microns in size, sintered together with a metal binder (usually cobalt) at high temperature and pressure. The ratio is 90-95% diamond particles with the balance being cobalt. CVD (Chemical Vapor Deposition) tool (Chemical Vapor Deposition) is a process of coating nanodiamond particles on a tungsten carbide substrate with a coating thickness of 6 to 16 microns. The tungsten carbide substrate must have a low cobalt content, such as 6%,overburden drilling systems, 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,dth button bits, 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 ,mining dth bit, 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. This is a major problem for composite drilling in high precision components such as aerospace. When delamination is the standard of failure, there is no doubt that CVD bits perform better than PCD bits. However, when bore diameter is the failure criterion, then the PCD bit will "live" longer than the CVD bit. The reason for this is that CVD diamond is a coating. When it finally comes off the tungsten carbide, the edge wear accelerates quickly. On the other hand, as mentioned above, PCD is a solid diamond. The rate of development of wear is almost constant. Another example where PCD may be advantageous is the drilling of laminated materials like CFRP/Al, where the exit hole is in aluminum. In this case, delamination is not a problem, therefore, Valin super hard PCD cutter will be preferred because it can be kept for a longer time and also can be reconditioned several times. Another advantage of CVD diamond drill bits is their design flexibility, while the PCD segments determine the geometry compared to standard wafer drill bits. However, on Valin superhard bits, there are no geometric limitations, and as long as the height of the PCD tip (with limitations) does not create other limitations, the flexibility of the design is the same as that of CVD diamond bits. Sum up The main goal of this article is to help users focus on their purpose in a particular application. Knowing and understanding your goals will help you define the tool requirements and choose the right tool for your application. Both PCD and CVD cutting tools have their advantages and disadvantages, as explained in the article. Neither of them can completely replace the other. We haven't discussed other factors in this article, such as tool cost, reconditioning, tool diameter limitations, and so on. Some of these factors will definitely influence our decision. 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 = [],dth drill bits, 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


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