Michae
Posts 6
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Knowledge of Cutting Tools: Drill Technology _ Machining
The excircle diameter of the drill bit the outer diameter of the clearance part and the shank part are processed on a high-precision cylindrical grinder to ensure the design requirements of the outer mining dth bit diameter cylindricity circular runout surface finish and the like In order to improve the machining efficiency on the CNC grinding machine the drill point can be chamfered before the alloy bar is placed on the CNC grinding machine for example the drill point angle of 140 ° can be roughly ground to 142 ° during chamfering
Bit Material 21 High speed steel High speed steel (HSS) is a kind of tool steel with high hardness high wear resistance and high heat resistance also known as high speed tool steel or sharp steel commonly known as white steel High speed steel cutting tool is a tool that is tougher and easier to cut than ordinary tools High speed steel has better toughness strength and heat resistance than carbon tool steel and its cutting speed is much higher than carbon tool steel (iron-carbon alloy) so it is named high speed steel; while hard alloy steel has better performance dth rock bit than high speed steel and its cutting speed can be increased by 2-3 times Characteristic The red hardness of high-speed steel can reach 650 degrees High speed steel has good strength and toughness sharp cutting edge and stable quality after sharpening It is generally used to make small and complex cutting tools 22 Cemented carbide The main components of cemented carbide drill material are tungsten carbide and cobalt which account for 99% of all components and 1% are other metals so it is called tungsten steel (cemented carbide) Tungsten steel is a sintered composite material containing at least one metal carbide 。 Tungsten carbide cobalt carbide niobium carbide titanium carbide and tantalum carbide are common components of tungsten steel
The grain size of the carbide component (or phase) is typically between 02 and 10 microns and the carbide grains are held together using a metallic binder The bonding metal is generally an iron group metal and cobalt and nickel are commonly used Hence tungsten-cobalt tungsten-nickel and tungsten-titanium-cobalt alloys Tungsten steel drill bit material sintering molding is to press the powder into blank then heat it to a certain temperature (sintering temperature) in the sintering furnace and keep it for a certain time (holding time) and then cool it down so as to obtain the tungsten steel material with the required performance dhd drill bit Characteristic And that red hardness of the hard alloy can reach 800-1000 degree The cutting speed of cemented carbide is 4-7 times higher than that of high-speed steel High cutting efficiency
Perfect installation and fixation For example increase the support area increase the clamping force 3 Check the main shaft bearing and sliding groove 4 Use high precision tool holder such as a hydraulic tool holder 5 Use a more ductile material Copyright notice Because some of the articles are from the Internet and some of the articles are pushed without timely contact with the original author If the above copyright issues are involved please contact us to delete or deal with the original author Return to Sohu to see more Responsible Editor wt-dthtools.com
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