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What is a carbide high speed drill?
The carbide high-speed drill is a drill bit used for core drilling. The steel cylindrical drill body is named after the carbide cutting tool inlaid with tungsten carbide.
Release time:
2021-12-10
The carbide high-speed drill is a drill bit used for core drilling. The steel cylindrical drill body is named after the carbide cutting tool inlaid with tungsten carbide. The shape of the cemented carbide cutting tool and the number of inserts on the drill, the arrangement, and the angle of inserts are different, which are called the bottom edge, the inner edge and the outer edge, so as to ensure there is a gap for water and powder discharge.
The upper part of the carbide high-speed drill is connected to the core pipe with a screw thread. Both the water tank and the water outlet ensure the circulation of the flushing liquid, so as to remove the rock powder and cool the drill bit. In order to increase the clearance when drilling into clay layers and shale formations, ribs are welded on the inner and outer walls of the carbide high-speed drill, which is called a rib drill bit. Needle carbide self-grinding drills can be used in hard formations with high abrasiveness. Generally, hard alloy drill bits can drill into formations with rock drillability of grades II to VII; needle-shaped carbide high-speed drills can drill into rocks of grades VI to VIII.
When choosing a carbide high-speed drill, the dimensional accuracy requirements of drilling need to be considered first. Generally speaking, the smaller the hole diameter to be machined, the smaller the tolerance. For this reason, drill bit manufacturers typically classify drill bits according to the nominal diameter size of the hole being machined. Among the above four types of carbide high-speed drills, the overall carbide high-speed drill has the highest machining accuracy (the tolerance range of φ10mm overall carbide high-speed drill is 0~0.03mm), so it is the best tool for machining high-precision holes. best choice.
The tolerance range of welded carbide high-speed drill or replaceable carbide crown drill is 0~0.07mm, which is more suitable for hole processing with general precision requirements; drills with carbide indexable inserts are more suitable for heavy-duty roughing , although its processing cost is usually lower than that of other drills, its processing accuracy is also relatively low, with a tolerance range of 0~0.3mm (depending on the length-diameter ratio of the drill), so it is generally used for holes with low precision requirements. machining, or finish the hole by changing the boring insert.
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