Metal deforming – By use of tool acting during relative rotation between tool... – With metal deformation of different type
Patent
1986-03-28
1987-09-08
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With metal deformation of different type
72 70, 72367, 72324, 72 80, 29508, 29516, B21D 1506, B21D 4100, B21K 116
Patent
active
046915508
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for the production of a pressure hose socket, a device for the production of such pressure hose sockets, and the hose pressure socket itself.
Such hose pressure sockets are needed for the production of hose connections in the high-pressure field. In such applications, a hose nipple, forming a hose coupling, is thrust into the end of the hose and presses the pressure hose socket onto the outside of the end of the hose. This enables a tooth formed in the socket to engage the end of the hose.
For hoses used in the low-pressure field, it suffices to make the hose pressure sockets from form-pressed sheet metal. Corrugations on the inner wall of the socket, stamped into the socket from outside, are sufficient for tooth engagement with the end of the hose. For high-pressure use, however, hose pressure sockets are turned from solid material. The production of the crowns of teeth, which usually run continuously around the inside of the socket is relatively expensive, because a lathe tool must make a plurality of cuts. Forming pointed teeth, especially for the production of a continuous ring of teeth, is practically impossible, since this requires not only radial but also axial movement of the lathe tool. Previously, cold forming of thick-walled metal sockets has not succeeded, because cutting from solid material, requires about three times as much raw material in relation to the final weight of the socket.
SUMMARY OF THE INVENTION
The present invention is, therefore, directed to the problem, especially for the high-pressure field, of providing a pressure hose socket of the thin-walled pipe sections (hereinafter called "sockets") and producing these sockets by cold forming. This problem is solved by the method and apparatus of the present invention.
Pipe sockets with a wall thickness from about 1.5 mm, are considered thin-walled. The minimum wall thickness increases with increasing socket diameter. Such sockets are suitable for all purposes of use in which a socket with inner teeth is rolled or pressed onto another object. Such sockets are equally suitable for teeth with obtuse, and acute angles at the tips of the teeth. A crown of such teeth, running around the inner wall of the socket may be either a continuous ring, or individual teeth arranged on a circumference. Preferably, the sockets are cylindrical, but they may have any other desired cross section.
The production process according to the invention makes it possible to produce pressure hose sockets by cold forming with common tools, and with those of hi-grade steel, without loss of material and extremely economically. Preferably, in the production of pressure hose sockets according to the invention, a pressing tool presses the continuous or interrupted corrugation and a stamp then forms, by means of a forming shoulder, under axial advance, the tooth or teeth. Finally, the pressing tool releases the socket and the pressing tool is moved into the neighboring work position, to produce, in the same sequence as described before, another crown of teeth on the same socket. The number of crowns necessary for a socket depends on the conditions to which the socket will be exposed. The end portion of the stamp has preferably a diameter smaller than the original inner diameter of the socket, and thus limits the flow of material in the pressing of the corrugation. The pressing tool, in turn, is an outer opposite support in the forming of the teeth by the forming shoulder. With this, the material forming, from the corrugation pressing, a crown of at least one inner elevation is formed on the stamp side into the desired contour. For this purpose, the stamp has, in connection with its said thinner end, a forming shoulder, which preferably has a relief corresponding to the desired tooth shape. The side of the tooth turned away from the stamp retains, therefore, essentially the form given by the corrugation press. In corrugations which do not run continuously around the socket, therefore, even single t
REFERENCES:
patent: 1666581 (1928-04-01), Rainaud
patent: 2300517 (1942-11-01), Milton
patent: 2771117 (1956-11-01), Le Febvre et al.
patent: 3371408 (1968-03-01), Charbonnet et al.
patent: 3479713 (1969-11-01), Weatherhead et al.
patent: 4548430 (1985-10-01), Haubert et al.
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