Advertising in MoldMaking Technology offers
Issue link: https://mmt.epubxp.com/i/111447
castings where thermal displacement is possible���that can permit software monitoring and correction of detected thermal displacement. Spindle displacement control is also possible with the right software. As a spindle rotates at high speed, centrifugal forces and heat expand the spindle taper causing error in the Z-axis. This axis accuracy is vital to precision mating of mold components. In addition to a high precision cooled spindle, software can be used to constantly monitor temperature at a number of points within the spindle assembly predicting thermal displacement. The system can then make necessary adjustments and effectively minimize thermal displacement, preventing Z-axis error due to taper expansion as the spindle rotates at high speed. A gate structure ���rmly supports the X-axis drive and distributes the load, vibration and heat from the upper section of the machine evenly through the frame. This arrangement keeps the feed drive stable during operation. A contour control system will offer an easy-to-use programming interface that provides a precise, custom contour control for the selected workpiece while supporting longer machine life and reduced process time. Such software will offer different options for cutting speed and accuracy, and for surface finish and geometry. A customizable display can provide real time monitoring and easy access. This software is able to be used with existing NC systems and is compatible with G-code programming. Learn More Visit our Machining Zone for more information on milling, drilling, grinding, high-speed machining, ���ve-axis, hard milling, micro machining, large mold machining, multi-tasking, waterjet and laser. Go to moldmakingtechnology.com/zones for a complete list. A cutting feed optimization routine that utilizes an adaptive control method to regulate the feedrate in real time will sustain a consistent cutting load while machining. As a result, cutting tools are less prone to damage and machining time is reduced. This system controls the feed velocity to maintain consistent cutting load. Features to look for include a graphic display of tool load and feedrate, convenient operation using G-code programming, and a number of data sets for specific tool and process control. Another mold machine consideration are highly sensitive thermal sensors���mounted at various locations in the machine toolholding At any speed a machine tool spindle is subject to centrifugal forces that increase as speed increases. At high speed, centrifugal force is strong enough to make a spindle bore grow slightly. As a collet segment rotates, the clamping mechanism gains centrifugal force and causes the relatively thin walls of the tapered shank to deflect radially at a faster rate than the wall of the spindle. This contributes to a stronger contact between the shank and the spindle, without affecting the axial position of the cutting edge, as it is determined by the face-to-face contact between the flange and the receiver. An HSK toolholder has contact on the spindle face and taper. When the spindle begins to grow, the face contact prevents the tool from moving up the bore. Most commonly, shrink-fit toolholders are used in mold machining due to total contact between tool and holder, approximating a solid carbide tool. This avoids the effects of temperature and vibration on the tool, supporting machining precision and high quality mold surfaces. Summary A well-designed mold machining center with an optimal machining system���including spindle, software frame and toolholders���delivers a total production method from tool selection to final product and provides the best choice for highprecision applications of various types and materials. contributor Robert Nedler is Product Manager, Machining Centers for Hwacheon Machinery America, and has nearly 30 years��� experience in the successful application of 3-5 axis machining centers in die/mold, aerospace, automotive and precision markets. For More inForMation: Hwacheon Machinery america, inc. 847-573-0100 / info@hwacheon.com / hwacheon.com moldmakingtechnology.com 41