Call our Sales Team on 0208 912 2120

Pressing Casings from Sheet

23rd May 1952, Page 58
23rd May 1952
Page 58
Page 58, 23rd May 1952 — Pressing Casings from Sheet
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.

Which of the following most accurately describes the problem?

APROCESS of pressing axle casings from steel sheet forms the subject of Patent No. 668,713 from the TimkenDetroit Axle Co., Detroit, Michigan,

U.S.A. One of the features of the scheme is that parts required to be thicker than the sheet can be fabricated by a combined pressing and forging operation.

The drawing shows the outline of the finished forging which is made in halves and joined along the welding line (1). Each half is hot-forged from a flat sheet into a channel-section of the required contour. The spring-seat regions (2) are rectangular in section and are thicker than the original sheet, and the excess metal at this point, when forged into the small size, gives a denser structure to the steel.

The flange frig (3) may be welded on, or it too may be formed by thickening during forg ng. The hemispherical closure howl (not shown) is permanently welded to the casing and adds strength. The bearing members (4) are separate units, butt-welded to the tube ends. The patent is mainly concerned with the sequence of forging operations and the dies used.


PATENT No. 668,893 comes from

I Daimler-Benz, A.G., StuttgartUntertiirkheim, Germany, and deals with an improved type of oil-engine piston. The patent refers to engines incorporating pre-combustion chambers and its aim is to prevent local heating of the piston crown by providing a high-conductivity member to receive the flame jet. The drawing shows a cylinder where 1 is the pre-combustion chamber and 2 the flame jet. At the receiving region of the piston there is provided a hollow insert (3) which is cast into the piston metal. The insert may be of high-duty aluminium alloy or of special steel, the chief requirement being that it shall have the same coefficient of expansion as the piston metal.

The interior of the insert is partly filled with mercury, sodium or other substance which will be liquid at the working temperature. The movement of the piston causes turbulence in the fluid so that the heat is rapidly distributed to the outer extremities where cooling fins dissipate it into the bulk of the piston.

POWERED STEERING SYSTEMS A POWER ASSISTED rtsteering system i s described in patent No. 669,101, by John Venni ng and Co., Ltd., Berkley Street, Birmingham, I. The power is derived from hydraulic pressure, but the valves are operated by electromagnetic means controlled by the movement of the steering wheel.

In the drawing 1 is the steering column and 2 the drag-link. The wormbox drop-arm (3) operates one or other of a pair of switches (4), the motion including a small amount of backlash. The switches control iolenoids (5) which in turn work hydraulic valves that admit fluid to one side or other of the servo-cylinder (6) which provides the working thrust.

The parts remain in the position that they have reached when the, driver water seal. The patentees are the Austin Motor Co., Ltd., J. Rix and W. Appleby, all of Longbridge Works, Birmingham.

Normally, such guides are press fitted in their bores, involving working to close tolerances. The invention consists of the use of sat packing washers to form a seal, as shown at 1 and 2. The lower washer is gripped between a recess in the casting and a shoulder on the guide. The upper is held in a hatshaped washer (3) which is placed under the valve'spring and subjected to pressure therefr,om.


PATENT No. 667,176 (General Motors Corporation, Detroit, Michigan, U.S.A.) discloses an underframe for the bodies of buses and lorries. The advantages claimed are lightness in comparison with the load carried.

The view shown gives a good idea of the general construction. The outermost members (1) are of angle-section, as are the cross-bearers (2), the latter being placed in the position of an inverted L-shape.

Each cross-member is reinforced by a punched plate (5) tapering away from the chassis-bearing members (4). These run for the full length of the structure.


People: John Venni
Locations: Birmingham, Detroit

comments powered by Disqus