US2015193A

US2015193A - Method of making a sheet metal barrel

Info

Publication number: US2015193A
Application number: US693531A
Authority: US
Inventors: Daniel J Reed
Original assignee: AO Smith Corp
Current assignee: AO Smith Corp
Priority date: 1933-10-14
Filing date: 1933-10-14
Publication date: 1935-09-24
Anticipated expiration: 1952-09-24

Description

Sept. 24, 1935. D. J. REED METHOD oF MAKING A SHEET METAL BARREL Filed Oct. 14. 1953 2 Sheets-Sheet 1 INVENTOR.

e ZJR e e cl Dani l #im ATTQRNEY.

Sept. 24, 1935. DJ; REED 2,015,193

METHOD OF MAKING A SHEET METAL BARREL Filed Oct. 14, 1935 2 Sheets-Sheet 2 /5 Y y Z INVENTOR.

Daniel J Reed ATTORNEY.

Patented Sept. 24, 1935 UNITED STATES PATENT OFFICE Daniel J. Reed, Milwaukee, Wis., assignor to A. 0.

Smith Corporation, Milwaukee, Wis., a corporation of New York Application October 14, 1933, Serial No. 693,531

2 claims.

This invention relates to a. method of making barrels formed of sheet metal and having a substantially cylindrical side wall and two end heads welded thereto.

'Ihe object of the invention is to provide a simple and economical method for making such a barrel, and which obtains an improved quality of structure and weld, whereby the barrel is enabled to withstand rough usage.

Other objects will appear hereinafter.

The accompanying drawings illustrate a barrel made in accordance with the invention and:

Figure 1 is a side elevational View with parts broken away and in section showing the details of construction;

Fig. 2 is a detail section of one end of the barrel showing the assembly of the parts;

Fig. 3 is a similar section showing the spinning operation; and

Fig. 4 is a similar section showing the final welding operation.

The barrel comprises, generally, a substantially cylindrical body portion I, a bottom head 2, a

.top head 3, and preferably has a central bilge band 4.

The body I of the barrel is preferably formed of sheet metal rolled into a cylinder and welded on a longitudinal seam 5. After welding, the body may be slightly bilged, if desired, by employing an expanding mandrel.

The bilge band 4 is of heavier metal to give strength and protectionvto the central portion of the barrel and is formed of arcuate cross-section with its ends 6 conforming to the shape and size of the body I and suitably secured thereto.

A suitable bunk tting I is welded to the body I at its inner end and to the bilge band 4 at its outer end to provide access to the inside of the barrel. The bilge band 4 serves to protect and reenforce the bung 1.

The bottom end head 2 is pressed from a. single sheet of metal and is preferably dished downwardly at its central portion and provided with a downwardly extending flange or skirt 8 at its outer edge adapted to fit into the end of the body I.

In making the barrel in accordance with the invention, the end head 2 is inserted in the lower end of the body I the desired distance, preferably until the edge of the ange 8 corresponds with the end edge of the body I, as shown in Fig. 2. Then the barrel is positioned in a. spinning machine and a shoulder 9 is spun in the wall of body I immediately adjacent the inner corner of the head 2, as illustrated in Fig. 3.

This spinning operation results in the formation of a circumferential groove I0 in the outer wall of the body I near the end and of a corresponding rib or bead II on the inside of the wall. The bead II provides the shoulder 9 against 5 which the end head seats tightly throughout the circumference. The spinning operation is preferably carried out cold, that is, without heating the metal, although care should be taken where a high carbon or other high strength steel is 10 employed not to embrittle the metal at the shoul der 9 by too much cold working.

After the spinning operation, the barrel is placed in a suitable welding machine and the head 2 is welded to the body I at the shoulder 9, 15 as shown in Fig. 4. The tight t between the head 2 and shoulder 9 eiiected by the spinning operation greatly facilitates the welding operation and the production of a iiuid-tight joint. The weld is preferably an electric resistance stitch 2O weld such as is made by employing two roller electrodes arranged to pass the welding current through the joint and simultaneously therewith to apply the Welding pressure, the weld being made progressively circumferentially of the joint. 25 The roller electrodes are shaped to conform to the contour of the head andshoulder, respectively, so as to obtain a good fluid-tight weld.

The top end head 3 is constructed similarly to the bottom head 2 except that its flange I2 extends upwardly. The head 3 is positioned in the top end of the body I and a shoulder I3, spun in the body I adjacent the head similarly to the shoulder 9 at the bottom head. The top head is then welded to the body I at the shoulder I3 in the same manner as the bottom head is welded at the shoulder 9.

The top head 3 may have a suitable tap connection I4 therein. Suitable chimes I5 are provided at the ends of the barrel to protect the end edges of the body I and flanges 8 and I2.

The construction provided by the invention has numerous advantages in use. When a loaded barrel is dropped on one corner, the shock is transmitted to the body portion through the' beads II which cushion the shock and tend to prevent undesirable deformations of the barrel Furthermore, the crevice between the lower end head and the side wall at the bead II tends to close as the bead is attened by the shock, thus preventing separation of the parts which would tend to crack the pitch lining I6 at the corner of the barrel. Excessive deformation of the head is also prevented by having the weld in substantially the same plane as the head, and the bead strengthensthe side wall and head against deformations.

I claim:

1. In the manufacture of sheet metal barrels having a. substantially cylindrical body portion and an end head, the steps comprising, inserting the head to its nal position in the body portion, forming a shoulder in the body portion against the corner `of the head, and welding the head to 10 the shoulderto provide a. fluid-tight joint.

2. In the manufacture o1 sheet metal barrels having a substantially cylindrical body portion and an end head, the steps comprising, inserting the head to its final position in the body portion of the barrel, spinning a. groove in the outer Wall of the body portion adjacent the head to provide a circtunferential shoulder on the inside of the body against which the head seats, and electric resistance Welding the head to the body portions at said shoulder.

DANIEL J. REED.