Patent GB-1163304-A (GB)
Title: Apparatus for Machining Irregularly Curved Surfaces
IPC: B24B35/00
Filed: 1966-08-26
Abstract: 1,163,304. Grinding; electro - erosion. AUGUST L€PPLE G.m.b.H. & CO. 26 Aug., 1966 [3 Sept., 1965], No. 38365/66. Headings B3D and B3V. [Also in Division C7] Apparatus for machining workpieces comprises a grinding, spark-erosion, electro-chemical or vibration tool mounted in a horizontally extending holder which is pivotable in a vertical plane and movable up and down, a first motor for effecting a straight line to-and-fro movement to the tool in one direction, a second motor for imparting a translatory movement to the tool from an initial position at one end of the workpiece to the other end and back, and a control appliance coupled to the second motor whereby the tool is returned between individual cycles of operation to the initial position for the translatory movement and the relative position between the workpiece and tool can be changed in direction transverse to that of the translatory movement by an amount not greater than the stroke of the working motion so as gradually to proceed from one end of the workpiece to the other. As described, the tool is a grinding stone 1, Fig. 2, carried by a pivot 3 a  at the end of a holder 2 which is reciprocatable in the direction of the arrows 5 by a pneumatic piston-andcylinder device 3 controlled by a valve 4. The device 3 is carried by a pivot 6a on a sleeve 6 and can be swung in a vertical direction about the pivot by a pneumatic device 18 connected at one end by a pivot 18a to the device 3 and at the other end to a pivot 16a on a sleeve 16, Fig. 1. The holder 2 and device 3 can also be swung in a horizontal direction by a pneumatic device extending between the device 3 and a second pivot 6b on the sleeve 6. The sleeve 6 is mounted on a screw-threaded spindle 7 rotatably mounted in bearings 7a, 7b in sleeves 9a, 9b and is driven by a motor 8 to transverse the sleeve 6, and hence the holder 2 and grinding stone 1 in a horizontal direction, the sleeve 16 sliding along a spindle 15 mounted in bearings 15a, 15b at the upper ends of the sleeves 9a, 9b. The latter sleeves are carried by screw-threaded spindles 10a, 10b which are mounted in frame members 11, 12 and are rotatable by a chaindrive 14b from a motor 13 to adjust the holder and stone 1 vertically. In another embodiment, a carriage 28, Fig. 4, is adapted to be driven by a motor 30 along rails 31 disposed adjacent a workpiece 48. The carriage supports a vertical column 27 which is rotatable about an axis 52 by a motor. A ring 32 is vertically adjustable by a cylinder 36 on the column and has a seat 37 for an operator and a pivot 43a about which anhydraulic cylinder 38 is adjustable by a cylinder 47. The rod of the cylinder 38 has a pivot 40 about which a working cylinder 39 is pivotable by a cylinder 43. The rod 25 of the working cylinder 26 carries a grinding stone 26 for operating on the surface of the workpiece. In a further embodiment, the grinding stone 56, Fig. 5, is mounted on the rod 55 of a cylinder vertically-adjustably carried by a column 57a rotatably adjustable in a carriage 58 which is adjustable along guide rails 69a, 19b by a screw- and-nut mechanism 70a, 70b driven by a motor 71a. The rails are carried by a frame 59 movable along rails on a floor. In each of the embodiments, a working movement is effected in the direction of the arrows 5, 29, 67 at an angle which is adjustable relative to the longitudinal axis of the workpiece, and after a predetermined time, the working movement is changed through an angle of 90 degrees, the movements being automatically controlled pneumatically or hydraulically through a control panel with sensing elements or a programme. At the same time a translatory movement is effected from one end to the other of the longitudinal axis of the workpiece.