Definition of cylindrical grinding machine
Cylindrical, conical or other shaped surface of the outer surface and the shoulder end of the grinding machine.
The workpiece is supported between the two tips of the head frame and the tailstock, and is rotated by the dial of the head frame for circular feeding motion.
The headstock and tailstock are mounted on the workbench for longitudinal reciprocating feed motion.
The workbench is divided into two upper and lower layers, and the upper workbench can be adjusted to a small angle to grind the conical surface.
Working mode and parameters
The wheel frame with high-speed rotating grinding wheel is used for lateral feed movement.
In order to reduce the length of the machine tool, the large cylindrical grinding machine is generally fixed, and the grinding wheel frame is used for longitudinal reciprocating motion and lateral feeding motion.
The grinding precision of the cylindrical grinding machine is generally: the roundness does not exceed 3μm, the surface roughness Ra 0.63 ~ 0.32μm, and the high precision cylindrical grinding machine can reach the roundness of 0.1μm and Ra 0.01μm respectively.
Cylindrical grinding machine classification
The cylindrical grinding machine is divided into a plunge-type cylindrical grinding machine, a universal cylindrical grinding machine and an end-face external grinding machine.
① Plunge cylindrical grinder
When the length of the grinding part of the workpiece is less than the width of the grinding wheel, the grinding wheel only needs to be continuously fed in the transverse direction, and does not have to move relative to the workpiece in the axial direction. The productivity of the grinding machine is high.
② Universal cylindrical grinding machine
An internal grinding accossary is attached to the wheel frame, and the wheel frame and the head frame can be adjusted to a certain angle around the vertical axis.
The spindle can also be rotated on the head frame in addition to the dial.
This kind of grinding machine can enlarge the processing range, can grind the inner hole and the inner and outer taper with large taper, and is suitable for small and medium batch and single piece production.
③ End cylindrical grinding machine
The wheel frame is inclined at an angle around the vertical axis, and the surface of the grinding wheel is trimmed into two grinding faces parallel and perpendicular to the workpiece axis, and the outer circle and the shoulder end face of the workpiece can be simultaneously ground, which is generally used for mass production.
In addition, there are high-efficiency double-wheeled cylindrical grinding machines and multi-grinding cylindrical grinding machines.
They can grind two or more journals simultaneously for high volume production.
Grinding movement of cylindrical grinding machine
When performing cylindrical grinding in a cylindrical grinding machine, there are several movements:
- The high-speed rotary motion of the grinding wheel is the main motion for grinding the outer circle.
- The longitudinal reciprocating motion of the workpiece with the table is the longitudinal feed motion of the outer circle.
- The rotation of the workpiece by the headstock spindle is the circumferential feed motion of the grinding outer circle.
- The grinding wheel makes a periodic lateral feed motion.