Diamond braze exist many urgent solution Difficulties: ① claim solder with good wettability and bonding strength of the diamond and the carcass; ② brazing the selection of materials and the brazing process to ensure the stability of the diamond, in order to reduce or avoid the erosion of the brazing material on the diamond; ③ due to thermal expansion coefficient difference of the diamond and the metal substrate, and thus the welding residual stress is also large, reducing the strength of the joint; ④ solder melting point higher than the working temperature of the diamond tool, it should be sought the lower melting point and the diamond expansion coefficient close to the metal (alloy) material as the brazing material, and then consider of some active elements in order to improve the wettability of the diamond and affinity to both bonded diamond and can meet the carcass mechanical properties purposes.abrasive tools, In addition, the diamond surface metallization way to achieve matching and selection of the surface of the metal solder flux and gas medium selection key technologies needed to further mature and optimized. Use efficiency and lifetime of diamond tools in addition to depending on diamond grit embedded as strong, with the wear resistance of the carcass. Carcass strength level, the distribution state of the diamond in the carcass, the concentration of the diamond and so interested in the wear resistance of the carcass impact, therefore, how the carcass reach the ideal state in future work noteworthy problem.cutting wheel
Reasonable choice of tool materials is an important condition to ensure high efficiency machining stainless steel. According to the cutting characteristics of the stainless steel, tool material should have good heat resistance, high abrasion resistance, stainless affinity. The high-speed steel and carbide tool material.
1) the choice of high-speed steel: high-speed steel is mainly used to manufacture of milling cutters, cutting wheel,drills, taps, broaches complex multi-point tool. Durability ordinary HSS W18Cr4V use when tool low does not meet the needs of a new type of high-speed steel cutting tool stainless better results can be obtained.
1Cr17Ni2 workpiece under the same turning conditions, the processing tool with W18Cr4V 95w18Cr4V two materials the tool sharpening processed at one time the number of pieces of 2 to 3 and 12, respectively, with 95w18Cr4V tool life increased several times. This is due to the increase of the carbon content of steel, thereby increasing the carbon content in the steel, the hardness at room temperature to improve better 2HRC red rigid rise to HRC51 to 52 at 600 ° C by W18Cr4V the HRC48.5 abrasion than W18Cr4V improve 2 to 3 times.
Application High Speed ??Steel W12Cr4V4Mo production type face milling machining of 1Cr17Ni2 can get a higher tool life. Because of the increase in vanadium content, can be formed in the steel the high hardness VC, the presence of small VC crystal referral, can prevent grain growth, improve the wear resistance of steel; W12Cr4V4Mo of good red hardness, hardness can be 600 ° C The TAT HRC51.7, therefore suitable for the production cutting stainless steel of various complex tool. But its strength (sb = 3140 MPa) and impact toughness (ak = 2.5 J/cm3) slightly lower than of W18Cr4V used to pay attention.cutting disc
With the continuous development of the tool production technology, for the bulk of the workpiece, carbide blade, a complex tool for cutting would be better.
2) Carbide choice: YG carbide toughness is better, use a larger rake angle, the blade can also be worn sharp, so cutting brisk, and the chip and tool is not easy to produce bonded more suitable processing of stainless steel. Especially in the roughing and interrupted cutting of vibration, the advantage of the alloy of the YG is more important. YG alloy thermal conductivity, thermal conductivity than high-speed steel is nearly twice as high, twice as high than the YT-based alloys. Of YG alloy stainless steel cutting used more often, especially in rough turning tools, cutting knife, reamer and reamer manufacturing applications more widely.