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In the manufacture of engineering machinery, mining machinery and off-road vehicles, often using the ZGMn13 class of high manganese steel. ZGMn13 high manganese steel Mn content reaches 11% ~ 14%, this kind of steel after water toughening treatment after the violent shock pressure, will produce very strong hardening, hardness is HB450 ~ 550, the depth of the hardened layer is up to about 0.3 mm. In the process of high manganese steel under impact pressure deformation occurred, will consume those who continue to function on the surface of steel impact force, inner force to the deeper to stop. In addition to the coefficient of thermal conductivity of high manganese steel is very low, only carbon steel 1/3 ~ 1/4, which brings great difficulties to cutting. Especially when drilling, serious tool wear, durable degree is low. Therefore, often made of hard alloy group drill drilling of high manganese steel.
The drill body of high manganese steel hard alloy drilling group for 40Cr manufacturing, cutting part is YG8 or YW hard alloy. The cutting part shape and iron group drill drill to approximate, will only increase to 0.08 D, the radius of the arc arc edge increased to 0.4 D, with the increase of B point blade knife sharp, improve the strength of the tool tip, improving the heat radiation condition, at the same time also played the role of sub chip. Similarly, grinding out double front in the outer edge angle, and grind the negative front angle, the outer edge of rear angle increased to 20 degrees, as shown in figure 1. Drill well, to use oilstone carefully and research edge, there shall be no sawtooth.
8 the use of carbide multifacet drill drilling high manganese steel should pay attention to what?
High manganese steel has high plasticity and toughness, high cutting temperature, carbide group drilling high manganese steel, should pay attention to the following questions:
(1) choosing cutting: cutting speed is too low or the feed quantity is too big, will cause the cutting force increase, easy to cause the cutting edge chipping. General Vc=30 ~ 40m/min, f=0.07 ~ 0.1 mm/r.
(2) to make full use of cooling liquid: high manganese steel linear expansion coefficient, drilling should make full use of cooling liquid, conditional can be workpiece immersion drilling in the coolant, in order to prevent the drill bit bite damage due to hole shrinkage.
(3) to strictly control the bit blunt standard: drilling process such as hear shrill scream or found outer corner angle and the bit edge wear of approximately 1 mm, will be timely drill regrinding, or continue to use that will speed up the drill wear damage.
(4) it is strictly prohibited to midway parking: carbide multifacet drill drilling high manganese steel, should adopt the automatic feeding, as far as possible without manual feed, otherwise it will increase the hardening phenomenon, make drilling more difficult. Operation should strictly midway parking, prevent cutting force caused by excessive "stuffy car", so that the drill bit break.
Besides the above points, in the use of carbide multifacet drill drilling high manganese steel, also asked the machine rigidity, small vibration. The hardness of the hard alloy, heat-resistant than high-speed steel with high toughness, but much lower than high speed steel, high temperature and strong vibration when cutting, will speed up the drill wear, causing chipping or welding, the drilling can not be carried out.