Summary
The raw material of cutting tool is constantly evolving, from high-speed steel, tungsten, metal ceramic, oxide ceramic to tungsten carbide. At the same time, new material tool geometry, structure and appearance changes with each passing day, driven by the development of grinding technology, emerged in the new tool grinding and dressing technology and the new binder. The grinding equipment also put forward requirements, high power, high material removal rate become the trend of the times, and on the basis of the higher requirements is the in processing at the same time can also realize the machine finishing.
The economic evaluation of the grinding process involves the machine cost, labor cost, management cost and tool cost.. Among them, labor hours, and machine costs accounted for 80%, which determines the to improve the economy, it is necessary to proceed from the following two aspects: 1) with high material removal rate, that is, to improve the grinding efficiency; 2) reduce the non grinding time. Lifting material removal rate can be realized by increasing the feed rate and the amount of each feeding, and in order to reduce the non grinding time, consider the replacement time and frequency of the grinding wheel is reduced, and with the help of grinder in the mechanic to achieve the purpose.
Recently, there have been can replace the habitual use of the resin bonded diamond and CBN grinding wheel, the ideal alternative products, ceramic bond diamond and CBN grinding wheel and its superiority in grinding is based on above to improve the economy of the two aspects above, especially in the slotted processing to more fully reflect the advantages.
2 the state of the ceramic bonded diamond or CBN grinding wheel
Undeniable is, because of its strong grinding force and a high material removal rate and a soft resin bonded diamond or CBN grinding wheel in the hard alloy or high speed steel cutting tool processing is still to be widely used. But more and more tool manufacturers to realize, resin bond wheel exist the shortcomings of poor low grinding ratio and shape, which makes the processing cost of the groove type high, especially when using 14F1 shape processing arc groove, this phenomenon is more serious.
And vitrified bond diamond or CBN grinding wheel is able to overcome this shortcoming, it not only easy to repair and maintain good, but also conducive to the row of chip and radiating can control the pore formation, with strong grinding force.
Usually in the installation of each wheel, radial and axial runout, and dynamic unbalance in the use of vitrified bond will encounter problems, so no handling directly inside the machine to be dressing will contribute to the accuracy of the substantial improvement of the grinding wheel.
3 ceramic bonded diamond or CBN grinding wheel slotting machining using examples
Grinding parameters:
Margin VF; feed rate ae=3,5mm maximum 150mm/min; cutting speed vc=12-44m/s.
Dressing parameters:
The feed rate of the grinding wheel is vcd=18m/s, the speed of the roller and the wheel is qd=0.7, while the feed rate is aed=3 m.
4 dressing system
High cost of a single vitrified diamond or CBN grinding wheel, only a mere a few millimeters of the grinding layer, without calculation of dressing and soon is finished using the, really used in grinding amount only 5-10% of the grinding layer, the rest of the is actually be repaired off. So, the correct way of dressing is very important..
Hengyuan diamond Co., Ltd. of contact dressing process in the dressing machine to fully solve the above problems, the most likely to reduce dressing parameters of the grinding layer, so as to prolong the life of grinding wheel, to achieve the purpose of reducing the non grinding time.
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