Patent GB-490082-A (GB)
Title: Improvements in the method of, and apparatus for, tempering gear wheels and other metal articles
IPC: C21D1/673
Filed: 1937-04-19
Abstract: 490,082. Fluid actuated valves. KLINGELNBERG, G. A., KLINGELNBERG, W. H., and KLINGELNBERG, H. W., (trading as KLINGELNBERG SOHNE, W. F.). April 19. 1937, No. 11137. Convention date, May 7, 1936. [Class 135] [Also in Group II] Gear wheels and other metal articles which are wide and thin are tempered by first pre-cooling the articles in a matrix with liquid and then cooling the article again while under pressure in the matrix. The matrix may be closed during the precooling and the pressure may be exerted hydraulically by means of liquid under pressure from the same source as the tempering liquid, e.g. oil. In the latter case oil is fed by a pipe 40 to a distributer 41 from which pipes 42, 43 lead to the cylinder 19, a pipe 44 for the cooling oil to the matrix and a pipe 45 to the tank 5. The pipe 44 has two branches 441, 44<11> to which the oil is fed alternately by adjusting a cock according as to whether the oil is to be fed to the centre of the wheel 1 and thus flows through passages in the plug 12 outwardly or in the reverse direction. The distributer 41 is provided with two cocks 47<1>, 481 operated by levers- 47, 48 and a slide valve 49 working in a chamber 52, and provided with collars controlling the ports to the pipes 42, 43 and 44 and also to the pipes 40, 45. A piston 51a on the end of the valve 49 moves in an end chamber 51. When the cock 48 is in the position shown in Fig. 1, oil flows through the ducts 50, 53 into the chamber 51 thus moving the valve 49 to the right. The valve thus closes the port leading to the pipe 44 and opens the port leading to the pipe 43, thus raising the plunger 20 and forcing liquid from the chamber 19 through the pipe 42 into the pipe 45 and thus into the tank 5. The hot wheel 1 to be tempered is placed on a matrix 2 provided with passages in its upper surface and supported on the top of a tank 5. A plug 12 made in two or more parts is inserted in the eye of the wheel 1 and is provided with a hole for the reception of the coned head of a rod 22 fitted on the end of a plunger which works within a plunger 20 working in the cylinder 19, a pressure die 3 being mounted on the plunger 20. The lever 481 is now swung over to the right and oil passes from the pipe 40 to the right end of the valve chamber causing the valve 49 to move to the left rapidly at first, oil being discharged from the chambers 51, 52 through the ducts 56, 53 and through the duct 55 if the cock 47<1> is open. In the movement of the valve 49, one of the collars thereon closes the duct 56 and thus as only the duct 53 is open and the duct 56 partly so, the movement of the valve is retarded which continues until the piston 51a clears the port opening to the duct allowing a quick discharge from the chamber 52 and thus causing a final rapid movement of the valve to its left-hand end position. In the first rapid movement of the valve, oil is discharged from the cylinder 19 through the pipe 43 to the pipe 45 thus allowing the plunger 20 to descend. At the same time the port leading to the pipe 44 is opened and the wheel 1 pre-cooled with oil. During the second slow movement of the valve, owing to the closing of the duct 56, the pre-cooling proceeds and in the final rapid period movement, the port leading to the pipe 42 is opened and oil admitted to the upper part of the cylinder 19 so that the die 3 is pressed heavily on the wheel 1. The duration of the pre-cooling can be regulated by adjusting the position of the cock 47<1>. When tempering is complete, the lever 48 is moved back to the position shown in Fig. 1 thus causing the valve 49 to move to the right and the plunger to ascend so that the tempered wheel 1 can be removed from the matrix 2. In a modification the valve 49 may be formed as a rotary valve in the form of a ring provided with a series of spaced segments corresponding to the collars on the valve 49 and rotatably mounted in an annular chamber in a valve body, the valve member controlling the ports to the various pipes in a similar manner, and also being provided with spigot cocks actuated in the same manner as the cocks 47<1>, 48<1>. The adjustment of the valve 49 may be effected by clockwork instead of by the oil pressure.