Metal vessel and a fabrication method for the same
First Claim
1. A metal vessel comprising:
- a cylinder including a shell member and a bottom member, the shell member comprises;
a shell part adjacent to the bottom member, the shell part having an external diameter which is larger than the external diameter of the bottom member; and
a neck part at an end opposite to the bottom member, the neck part having an external diameter which is smaller than the external diameter of the shell part, the neck part projecting from the shell part and is formed from the same member as the shell part; and
the neck part including an opening part;
wherein one end of the shell member being made integral to the bottom member by welding, the other end of the shell member providing the opening part wherein the cylinder is formed by a fabrication method comprising the steps of;
disposing the cylinder in a die comprising a moving die and a stationary die in a state wherein the moving die and the stationary die are separated, so that the opening part is on the stationary die side and the bottom member is on the moving die side; and
fabricating the metal vessel by carrying out hydraulic bulge formation in such a manner that a length of the weld between the shell member and the bottom member is approximately the same before and after the hydraulic bulge formation by moving the moving die towards the stationary die, expanding the shell member of the cylinder, and at the same time injecting a liquid into the cylinder and then applying pressure.
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Abstract
In the present invention, in a method of fabricating a metal vessel formed by expanding in hydraulic bulge formation a cylinder having a bottom, wherein a flat plate material is formed into a cylinder, the edges welded, and a bottom member welded to one open part of the cylindrical shell member, the stationary point of the expanded part of the shell member is made the expanding part side from the shell member—bottom member weld of the cylinder with a bottom, and thereby by expanding the shell part on the opening side, a metal vessel is formed, and thus the time of the processing itself of a plurality of expanding process of press-working and ironing and transiting of moving from one step to the next can be completed by one step, decreasing the time and reducing the cost.
30 Citations
20 Claims
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1. A metal vessel comprising:
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a cylinder including a shell member and a bottom member, the shell member comprises;
a shell part adjacent to the bottom member, the shell part having an external diameter which is larger than the external diameter of the bottom member; and
a neck part at an end opposite to the bottom member, the neck part having an external diameter which is smaller than the external diameter of the shell part, the neck part projecting from the shell part and is formed from the same member as the shell part; and
the neck part including an opening part;
wherein one end of the shell member being made integral to the bottom member by welding, the other end of the shell member providing the opening part wherein the cylinder is formed by a fabrication method comprising the steps of;
disposing the cylinder in a die comprising a moving die and a stationary die in a state wherein the moving die and the stationary die are separated, so that the opening part is on the stationary die side and the bottom member is on the moving die side; and
fabricating the metal vessel by carrying out hydraulic bulge formation in such a manner that a length of the weld between the shell member and the bottom member is approximately the same before and after the hydraulic bulge formation by moving the moving die towards the stationary die, expanding the shell member of the cylinder, and at the same time injecting a liquid into the cylinder and then applying pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A metal vessel comprising:
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a cylinder including a shell member and a bottom member, the shell member comprises;
a shell part; and
a neck part at an end opposite to the bottom member, the neck part having an external diameter which is smaller than the external diameter of the shell part, the neck part projecting from the shell part and is formed from the same member as the shell part, and the neck part having an opening part;
wherein the shell member has an inwardly directed flange at one end to provide a reduced diameter opening in the shell member, the bottom member being welded to the flange to close the opening reduced diameter and the weld between the bottom member and the shell member is positioned at a deepest part of the vessel with respect to the opening part. - View Dependent Claims (18, 19, 20)
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Specification