GB1195283A - Apparatus for Superfinishing Crankpins of Crankshafts - Google Patents

Abstract

1,195,283. Superfinishing crank-pins. K. WIECK and W. HENTZEN, [trading as SUPFINA WIECK & HENTZEN], and BREMER VULKAN SCHIFFBAU UND MASCHINENFABRIK. 22 June, 1967 [22 June, 1966; 30 Dec., 1966], No. 28976/67. Heading B3D. Apparatus for superfinishing a crank-pin 2 of a crank-shaft 3 comprises at least one superfinishing tool mounted on a tool-carrier 18 adapted for location adjacent to the crank-pin and supported by a support arm 4 such that on rotation of the crank-shaft about its axis the tool-carrier follows the rotary path of the crankpin and provides relative rotational movement between the superfinishing tool and the crankpin, said support arm comprising a double parallelogram linkage 6, 6, 7, 7 one end of which is fixedly supported and the other end of which supports the tool-carrier. The parallel bars 6, 6 are pivoted at 8, 9 to a stationary frame 5 and at 10, 11 to an intermediate plate 12; the parallel bars 7, 7 are pivoted at 13, 14 on the plate 12 and at 15, 16 to a holding-plate 17 from which is fixedly suspended a tool carrier 18. The carrier 18 comprises U-shaped end plates 23, (24), connected by bolts 25; rollers 26, 27 mounted in the carrier engage the upper surface of the crank-pin. Superfinishing tools 19, 20 are mounted in carriages 21, 22 slidable on the carrier 18. Each carriage is guided on hardened guide rods 29, 30 and is moved parallel to the axis of the crank-pin by a nut 33 mounted in the slide which meshes with a threaded spindle 34 attached between the end-plates 23, (24) of the carrier, and which is rotated by a stopping mechanism 28. This comprises a toothed wheel 35 connected with the nut 33 and actuated by pawls 43, 44 pivoted to bolts 40, 41 actuated pneumatically by pistons 38, 39 in cylinders 36, 37. One unit 36, 38 serves to rotate the nut in one direction while the other piston 39 is in retracted position; reversal takes place at the end positions of the carriage. The number of switching steps per minute depends on the r.p.m. of the motor for rotating the crankshaft, and the total number of switching steps depends on the diameter of the crank-pin. In the superfinishing tools 19, 20 devices driven by compressed air are provided which are counterbalanced. The amplitude of vibration and the surface pressure of the stores can be infinitely regulated by pressure-relief valves.