The functional component of high-powered machine tool
From at the beginning, an accurate machine tool has nicety, durable main shaft with respect to need installation, and should deserve to the function controls complex process formidably with the controller with agile operation. But how to make the motion of the motion of main shaft or workpiece is achieved so tall precision and repeat precision?
Apparent, the base of the machine tool should be very strong with stability, and another crucial factor is sharp movement component choose, for example of slideway and ball guide screw choose. Linear slideway, just as its name implies, its function is to control 3 axes to move point-blank. And, they also should have character of high load capacity and low attrition property, make its are below condition of high speed movement thereby, do not happen stick sluggish to skid phenomenon, hard course cannot replace this one advantage.
A few years ago, the machine tool uses sliding slideway to direct, have drive by guide screw. The attrition strength of this kind of component is relative taller (the lubricant characteristic with different pitch, different basis and different whorl species, the efficiency of guide screw is 60 % about) . Pass guide screw, move whirligig translate into point-blank, and guide screw passes shaft coupling and dc electric machinery (before this, use dc pace to enter electric machinery) photograph join, the main shaft that gives a machine tool provides transmission power. Controller dictates the program to changeover moves into corresponding 3 coordinate or much axis moves. Because the speed of that moment and precision are quite low (general and rapid transverse movement is 100 to 200in/min, the requirement repeats precision to be 0.001in, 1 In=0.0254m, similarly hereinafter) , the component with that kind of accordingly higher coefficient of friction is acceptability still.
A few years ago, fast and floating rate had exceeded the linear electric machinery that manufacturer of some machine tools announces to place of their machine tool is used 2000 In/min. Steep drive electric machinery is the device of a kind of straight drive, the principle that magnetic induction produces when using coil to pass permanent magnet is made and become. As a result of coil medium voltaic size is mixed phasic produce change at any time, and coil and magnet make opposite motion, mutual between do not produce a contact, any attrition power do not produce between transmission component consequently, because this can arise,high speed is mixed accelerate effect. Although contrast of their rigid structure photograph is simpler (they replaced bearing of ball guide screw, shaft coupling, bearing and nut piece) , but the price of steep drive electric machinery is very high still, especially electric machinery of large and steep drive, in certain application domain, need bears very tall outside stress. Electric machinery of these large and steep drive also can produce tremendous quantity of heat.
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