New-style treatment craft exceeds the introduction of performance dominant position of hard turning technology

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  • source:BAGANZ CNC Machining
As the ceaseless development of manufacturing industry, the home is seeking manufactory of world machine tool to reduce the manufacturing cost that processes spare parts and finished product with new technology all the time, make exceed hard cutting to become current the new-style treatment craft that each manufacturer pays close attention to. Anticipate in before long in the future, exceed hard cutting technology to will develop more maturely, be used widely by people place. Exceed hard turning to be defined to be high to HRC45 above hard talent to pledge work sheet chooses the treatment course of cutting. Normally workpiece material qualitative hardness can achieve HRC58 ～ the limits of 68, material of cutting cutting tool basically chooses CBN(cubic nitrogen to change boracic) character. The treatment that exceeds hard turning technology not to beg freeboard nicety grinding for those is made offerred a new alternative. Of course, the workpiece of the workpiece of accurate to certain freeboard requirement, easy metabolic workpiece and special requirement, grinding craft still compares the choice that suit. Although exceed hard turning to still cannot replace freeboard nicety grinding completely at present, but already can replace quite the accurate grinding of one part, reduced grinding to make the high manufacturing cost in the process thereby. Current, the workpiece surface surface roughness that exceeds hard cutting can amount to Ra0 commonly.

2 ～ Ra0.

4, circularity can be amounted to 0.

0005mm, dimension precision is controallable in 0.

003mm less than. The manufacturing efficiency that compares discovery to exceed hard turning to machine craft to machine craft than general grinding through cutting wants tall 4 ～ 6 times. The cutting below the case that using cutting fluid refrigeration the hard part of a HRC62, can produce a lot of quantity of heat. When exceeding hard cutting commonly, cutting nods the temperature inside area to be able to be as high as 926 ℃ . In fact, local tall lukewarm thermalization can help the finishing of cutting process, the high fever that cutting tool cutting nods can produce anneal and bate effect to the cut of workpiece beforehand, make workpiece easier cutting. All these cuts a course in, the heat of the majority is by what cut bits to come off and arise. Machine quality to get elegant face, when last cutting, answer to reduce cutting deepness as far as possible, ordinary control is in 0.

25mm less than. In exceeding hard turning to already was made in car component by wide application currently. Total plant of Shanghai car gear uses this one technology successfully produce at large quantities of quantities in the center, they collect generation of car of in order to to grind after gear cementite quenchs, undertake the final nicety of finished product is machined, in order to achieve the public errand that the spare parts designs and requirement of exterior surface roughness. Can be amounted to by the exterior surface roughness of treatment workpiece Ra0.

2 ～ Ra0.

4, circularity can be amounted to 0.

0005mm, 0.

The public errand of 003mm takes Cpk value to be able to be amounted to 1.

67. CNC Milling