US1799724A - Pressure welding machine - Google Patents

Description

April 7, 1931. F. J. BROWN PRESSURE WELDING MACHINE Filed Aug. 15, 1930 I 3mm ,Fzza n]: J B rozun Patented Apr. 7, 1931 UNITED STATES PATENT OFFICE FRANK J; BROWN, OF WASHINGTON, PENNSYLVANIA, ASSIGNOR T NATIONAL WROUGI-I'I IRON ANNEALING IBOX COMPANY, OF WASHINGTON, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA PRESSURE WELDING MACHINE Application filed August 13, 1930. Serial No. 475,061.

This invention relates to welding and especially to presses for applying dies with pressure to metal parts while at welding temperature to effect a joint and in particularis concerned with welding the head to the shell in the manufacture of annealing boxes.

An object of the invention is to produce a joint of neat appearance, by avoiding distortion of the metal walls during welding.

Another object is to produce a joint of uniform quality, texture and strength.

Another object is to facilitate and reduce thecost of manufacture.

In the accompanying drawing which shows an embodiment of the invention, 7

Figure 1 is a side elevation of a press, showing in section a box of the character the press 1s adapted to weld.

Figure2is a front elevation of same, indi eating in dotted lines a larger box and the manner of adjusting dies to different size boxes. I v

Figure 3 is a perspective view of bolster 4 in Figure 1 and the die 8 bolted to it.

Figure 4 is a perspective view of the end of top arm of frame 1, Figure 1, and the die 17 it supports; and

Figure 5 is a perspective view ofone of the corner dies 27 in Figure 2.

The same numerals refer to corresponding parts in the difierent figures of the drawing.

In Figure 1 is shown the frame 1 of an open gap press, on which a box is shown,-with its shell 2 lying on the table 3 of bolster l. The shell has already been prepared in previous operations and the head 5 of the box has been pressed into form to fit well on the shell, with a flange 6. The dotted lines 7 indicate the manner of accommodating boxes of greater depth than that shown in section.

In Figure 3 is shown bolster 1 with its die 8, against which the head 5 of the box is shown in Figure 1. Die 8 is detachable at 9, permitting dies of various widths to be bolted to the bolster, for accommodating boxes of different dimensions.

In Figure 2, the box is seen again with its shell 2 and flange 6 of the head in section. Here the front of die 8 is seen in front view and is partly broken away, showing parts pressure by a pump and motor in ca'sell,

controlled by suitable valves in a manner well understood and not shown. In Figure 1 the plunger 13 is indicated as incontact with the end of a deep shelled box7, but plunger 13 can move out to reach'shells of less depth, such as shell 2.

Bolster 4 has a pivot 15, inwhich a stout pin attaches it to block 16, permitting the bolster to drop downward sufiiciently to bringthe box in on to table 3, a ter which the bolster is lifted to the position shown, by means described below.

A die 17, Figure 1, is held by arm 18 in the bevel groove 19, as better illustrated in Fig.

ure 4, which manner of attachment permits dies of various widths to be inserted for boxes of different dimensions. As seen in Figure 1, die 17 is inside the box. Also in Figure 2, die 17 and arm 18 are seen in front elevation inside shell 2 and head 5. of the box.- Die 8 has two acting faces, as seen in "Fig ure 3. Face 20 reacts against plungers13 andface'21 acts against die 17. Die' 8 issupport ed'on two plungers 22, Figure 2, in cylinders 23,'supplied with oil under pressure from pump 14. On releasing oil from cylinders die 8fand the bolster will sink sufficiently' to allow a box to pass between dies 8 and 17 A third pair of plungers 2 1, 24, Figure 2, in cylinders25, set at an angle on supporting brackets 26, 26 carry dies 27 27'. A die 27 is seen inFigure 5, with its concave face 28 to fit around the box cornergas seen in F igure 2, and with bevel supportingmember 29 for attachment to a plunger 2 1. Attachment 29' permits the use of dies of different radius. p I

The box,i with shell 2and head'5alrea'dy fittedt ogetlier and heated in a furnace to 1 The view and section welding temperature along the edge, is brought into position on table 3. Oil is admitted to cylinders 23 until die 8 has lifted the box into firm Contact with die 1'2, but without pressure.

High pressure is then applied in cylinders 12, driving the end surface of shell 2 with great force against the inner wall of head 5 and effecting a weld of these two surfaces. High pressure is now admitted to cylinders 23, setting dies 8 and 1'? with great force against flange (3 and the adjacent surface of shell 2, effecting a weld of these surfaces. And finally high pressure is admitted to cylinders carrying the weld part way around two corners of the box.

Dies 27 are shaped to reach a little more than around the co "her, so that in Welding the four sides of a box, the complete turn of each corner will be welded unt er pressure.

Cylinders 23 are supported by brackets 30 on base 31. The base is of a width which permits brackets 30 am to be adjusted to a range of positions. in the position indicated by dotted lines 264:, plunger 24a accommodates a box of the dimensions indicated by dotted lines 10. Brackets 30 are adjustable along base 31 to better support die 8 when a wider die is used.

The invention is not intended to be limited to the form or any of the details shown r described, but to embrace the scope of the following claims.

What is claimed is:

1. in a welding press, the combination of .n open gap frame; means on one arm of the raine for holding a die; a bolster pivoted on the other arm of the frame having means for holding a die and a table for supporting articles to be pressed; and means adapted to tilt the bolster and table and to bring the two dies into coaction, with pressure on heated articles between them.

2. In a press for welding boxes, the combination of an open gap frame; means on the upper arm of the frame for holding changeable dies; a bolster pivoted. on the lower arm of the frame, having a table for supporting a box and means for attachment of changeable dies; and hydraulic plungers adapted to tilt the bolster and table and to force an attached die upward.

3. In a welding press, the combination of an open gap frame; means for supporting a vertically acting die on the upper arm of the frame; a bolster pivoted to the lower arm of the frame having means for supporting a vertically acting die and a horizontally acting die; means for causing said vertically acting dies to coact, with pressure on heated articles between them; and means coaoting with said horizontally acting die to apply pressure on said heated articles.

4. In a press for welding boxes, the combination of an open gap frame, having a base;

n'ieans on the upper arm of the frame for holding changeable dies; a bolster pivoted on the lower arm of the frame, having a table for supporting a box and means for attaching changeable dies; olungers in cylinders mounted on the base adapted to tilt the bolste' and table and to force an attached die upward; and plungers in cylinders mounted on the sides of the frame, adapted to force a box supported on the table against a die attached to the bolster.

5. In a welding press, the combination of an open gap frame; means for supporting a vertically acting die on the upper arm of the frame; a bolster pivoted on the 1 wer arm of the frame having means for supporting a vertically acting die. and a horizontally acting die; means for causing said vertically acting dies to coact, with pressure in one sense on heated articles between them; means coactin with said horizontally acting die to apply pressure in a second. sense on said articles; and dies with means for applying pressure in a third sense on said articles.

(5. In a press for welding boxes, the combination of an open gap frame, having a base; a detachable die held by the upper arm of the frame; a bolster pivoted on the lower arm of the frame, having a table for supporting a box; a second detachable die held by the bolster; plungers in cylinders ad- "ustably mounted on the base, for tilting the bolster and table and forcing the second die upward to press box members between itself and the first die; plungers in cylinders mounted on the sides of the frame, for driving a box against the second die; curved dies adapted to fit around box corners; and plungers carrying the curved dies, in cyl inders adjustably mounted on the base, for pressing box members between the first die and the curved dies.

In testimony whereof I affix my signature.

FRANK J. BROWN.

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