The polishing wheel is connected to the motor through the polishing shaft belt pulley to perform rotary motion, and the guide wheel is connected to the motor through a reducer and a coupling and fixed on the universal rotary radial feed slide base. A horizontally movable linear guide rail is installed between the polishing wheel and the guide wheel, and two moving sliders are arranged on the guide rail, and the two sections of the workpiece are fixed on the moving sliders, so that the workpiece can move back and forth on the linear guide rail. When the feed handle on the sliding table is manipulated, the guide wheel contacts the workpiece, the workpiece starts to rotate, and continues to feed to contact the polishing wheel, and the surface grinding process is performed on the workpiece when the polishing wheel rotates. At the same time, the workpiece moves axially to complete the polishing of the workpiece
Features and Benefits
(1) Automatic feeding, centered outer circle polishing. When the polishing wheel rotates at speed n1, the workpiece has a tendency to rotate at the same linear speed as the polishing wheel. At the same time, it is restricted by the friction force of the guide wheel on the workpiece. As a result, the workpiece It rotates close to the linear speed of the guide wheel (the linear speed of the guide wheel is much lower than that of the polishing wheel), so that a large speed difference is formed between the polishing wheel and the workpiece, thereby producing grinding action. Changing the angle of the guide wheel and adjusting the frequency converter can also adjust the axial speed of the workpiece. During installation, the forward direction and speed of the workpiece can be changed by adjusting the angle α between the axis of the guide wheel and the horizontal plane.
Taking the workpiece as the research object for force analysis, when the angle between the axis of the guide wheel and the horizontal plane is adjusted to α, the radial direction of the guide wheel and the radial direction of the polishing wheel is also α. It can be seen that when the speed of the guide wheel remains unchanged When the angle α between the axis of the guide wheel and the horizontal plane increases from zero, the value of sin α increases continuously, and the speed of the horizontal movement of the workpiece with the support frame also increases. When working, the center of the workpiece must be higher than the center line between the guide wheel and the polishing wheel, so that the contact points between the workpiece, the polishing wheel and the guide wheel are not on the same diameter of the workpiece, so that some convex surfaces on the workpiece rotate repeatedly The middle can be rounded one by one to avoid grinding out round workpieces.
Practice has proved that the higher the workpiece center is, the easier it is to obtain higher roundness and the faster the rounding process, but the distance above the workpiece center should not be too large, otherwise the upward vertical component force of the guide wheel on the workpiece may cause the workpiece to jump , thereby affecting the quality of the machined surface.
(2) Use high-quality corundum rubber wheels as guide wheels.
The general grinding wheel is composed of abrasives and adhesives, and the abrasives generally include silicon carbide, corundum, diamond, cubic boron nitride, etc. Adhesives include resin, ceramics, brass, etc. The advantage of using a harder corundum rubber wheel as a guide is wear resistance, increased friction, and avoiding lost rotation.
(3) The workpiece clamping is simple and easy
When the workpiece is clamped, it is only necessary to put the shaft supports at both ends of the shaft into the bearing holes of the slider, without adjustment and alignment.