Why is CNC machining center machined with carbide?
Cemented carbide is a kind of processing material commonly used in CNC machining centers.Commonly used hard alloys are tungsten-cobalt,tungsten-titanium-cobalt,tungsten-titanium-tantalum,and hard alloy materials can be used to make turning tools,milling cutters,planing knives,Various types of tools,such as drill bits,are suitable for different types of machining processes and workpiece materials.Why do CNC machining centers use hard alloys?
First,cemented carbides have extremely high hardness and wear resistance.At room temperature,its hardness can reach 69 to 81HRC,and the wear resistance is also quite good.Therefore,the cutting speed of the tool can be 4 to 7 times faster than that of the high speed steel tool.The service life is not lower than the latter,but it is 5 to 80 times longer than the high speed steel tool and can be used for cutting hardness up to 50HRC.High hardness material.
Second,cemented carbides also have high strength and modulus of elasticity.Its compressive strength reaches 6000MPa,and the elastic modulus can reach 735MPa.Both indexes are higher than high-speed steel materials.However,cemented carbides have a low flexural strength of only 1000 to 3000 MPa.
Third,cemented carbide has good corrosion resistance,oxidation resistance and high temperature resistance.Carbide-made tools are generally resistant to corrosion caused by the atmosphere,acids,alkalis,etc.,are not susceptible to oxidation,and can be kept hard at temperatures between 900 and 1000 degrees.
Fourth,the coefficient of linear expansion of the cemented carbide is small,which results in a stable shape size when processed.
Fifth,products that are formed using cemented carbide are usually not processed and reground.This is because the brittleness of hard and gold is high,and it is easy to cause chipping during regrind,so it can only be used for electric machining such as electric spark,wire cutting,electrolytic grinding or special grinding wheel grinding.
The performance of cemented carbide is very good.The mold made of cemented carbide can withstand the impact better,and has better impact toughness,fracture toughness,fatigue strength,flexural strength and wear resistance.Therefore,CNC machining centers often Cemented carbide is used as the processing material.