A travelling carriage carrying a motor driven grinding wheel at the end of a pivoted arm reciprocates back and forth along a steel slab workpiece. A hydraulic cylinder forces the wheel down against the workpiece, this downward movement being controlled in accordance with the power being supplied to the motor and the speed of reciprocating travel of the carriage. Control of the contact pressure of the wheel is thus based on the power being absorbed by the motor, which ensures a substantially constant rate of work output by the wheel. These conditions prevail during carriage travel at normal speed. When the carriage slows down to change direction at the ends of its reciprocal travel, a mechanism sensing the carriage speed reduces the rate of work output of the grinding wheel to obtain a more constant value for the work output per unit distance of travel, the result being more uniformity in the depth of cut. Provision is made for indexing the arm transversely of the workpiece at each end of carriage travel. The maximum magnitude of the acceleration and deceleration of the carriage at the travel ends is limited in order to increase the comfort of an operator seated on the carriage. The grinding wheel peripheral speed is kept constant by a radioactive source and detector system that measures wheel diameter and speeds up the motor as the wheel wears. To facilitate this speed control a D.C. motor is used. As an alternative to a moving carriage, the structure carrying the grinding wheel can be stationary, the workpiece holder then reciprocating, the same controls over the grinding wheel pressure being exercised.
A method for removing burrs in a continuous rolling process including the steps of joining the rear end of a preceding billet with the front end of a succeeding billet using a flash butt welding method while both billets are moving, and grinding a burr on the welded part of the joined portion using a plurality of grinders while the billets are moving and while rotating the grinders and moving the grinders synchronously with the travelling speed of the billets. A grinding machine for continuously rolling a round billet includes a travelling body shuttling along the direction of movement of the round billet, a turret ring rotatably supported by the travelling body, and a plurality of grinding devices arranged in a movable manner within a radius of the turret ring, wherein the grinding devices include grinders which are set at a tilted angle relative to the center axis of the rotatable turret ring. A grinding machine for continuously rolling a rectangular billet includes a travelling body moving along a moving direction of the rectangular billet, two pairs of grinding devices located at a front side and a rear side, respectively, of the travelling body and having grinders which rotate on a plane facing the rectangular billet and along a longitudinal direction of the rectangular billet, a moving device for moving the grinding devices in a right angle direction relative to the rectangular billet, and a device for moving the grinders to come close to and apart from the rectangular billet.
A grinding machine particularly suitable for use in grinding curved surfaces of a pre-machined work, the machine comprising a working table disposed horizontally for fixedly holding a work thereon and movable back and forth in a horizontal direction; a grinding head supported on a machine frame and movable vertically toward and away from the working table, the grinding head including an abrasive grinding tool and a tool-driving electric motor for rotatingly driving the grinding tool; and means for controlling the movement of the working table and grinding head in response to variations in the load current of the tool-driving motor in such a manner as to effect uniform and smooth grinding job on the surfaces of the work.
4193227 - Adaptive grinding control - Owned by Cincinnati Milacron-Heald Corporation (Worcester, MA) [*] Notice:The portion of the term of this patent subsequent to April 3, 1996 has been disclaimed.
A method and apparatus for controlling the infeed of a grinding machine senses the interface force between a grinding wheel and a workpiece to control infeed for grinding a workpiece with diverse grindability characteristics. The infeed is increased in response to an increase in the sensed force until the interface force reaches a predetermined level; while the interface force is decreased to a predetermined level in response to a decrease in the sensed force.
A grindstone or like block of abrasive material is affixed at the lower end of a first support rod slidably received in a vertical sleeve. A second support rod coupled to the sleeve at a right angle thereto is also slidably received in a hollow offset arm at the upper end of an upright standard. An electromagnet is clamped to the standard for releasably mounting the commutator grinder on a desired commutator machine. The commutator grinder is further equipped with an infeed mechanism and a traverse feed mechanism which enable the grindstone or the like to be fed toward and in the traverse direction of the work. The infeed mechanism comprises a handle, worm gearing, and a feed rod screw-threadedly received in a hollow formed axially of the first support rod, such that the rotation imparted from the handle to the feed rod via the worm gearing is translated into the up-and-down motion of the first support rod relative to the sleeve. The traverse feed mechanism also comprises a handle and a feed rod screw-threadedly received in a hollow formed axially of the second support rod, the rotation of the second mentioned feed rod being likewise translated into the back-and-forth motion of the second support rod relative to the offset arm.
An apparatus senses the extent of actual wear of a grinding wheel at an area where the wear will be the greatest during the grinding of a workpiece. The grinding wheel is dressed by removing material from the grinding wheel to an extent which is a function of the extent of sensed wear at the location where the wear is the greatest. The apparatus includes a probe member which is movable toward the circular working surface or side of the grinding wheel from a retracted position and a detector assembly which detects when the probe member initially engages the circular side of the grinding wheel. In some embodiments of the invention, the probe member is moved toward the grinding wheel in incremental steps with sufficient time between the steps to enable the grinding wheel to rotate through slightly more than one complete revolution. In one embodiment of the invention the detector assembly includes a mass which is connected with a probe member. Upon initial engagement of the probe member with the circular side of the grinding wheel, relative acceleration occurs between the mass and probe member. In another embodiment of the invention the detector assembly includes a load cell which detects the occurrence of deflection upon initial engagement of the probe member with the grinding wheel. In still another embodiment of the invention, the probe member is moved with a wheel dressing tool to detect when a wheel dressing operation has been completed. After a wheel dressing operation has been completed the rotational speed of the grinding wheel is increased to maintain a desired surface speed even though the diameter of the grinding wheel has decreased.
