US3505719A - Drawing and swaging die apparatus - Google Patents

Description

April 14, 1970 OMALLEY ET AL 3,505,719

DRAWING AND SWAG ING DIE APPARATUS Filed Nov. 14, 1966 4 Sheets-Sheet 1 April 14, 1970 L. OMALLEY ET L 3,505,719

DRAWING AND SWAGING DIE APPARATUS Filed Nov. 14, 1966 4 Sheets-Sheet 2 FIG.3

April 14, 1970 L. OMALLEY ETAL 3,505,719

DRAWING AND SWAGING DIE APPARATUS 4 Sheets-Sheet 3 FIGS FIGS

April 14, 1970 L. O'MALLEY ET AL 3,505,719

DRAWING AND SWAGING DIE APPARATUS Filed Nov. 14, 1966 4 Sheets-Sheet 4 United States Patent 3,505,719 DRAWING AND SWAGING DIE APPARATUS Laurence OMalley, 61 Jacobson Ave., Kyeemagh; John Cowdroy, 15 Old Sydney Road, Seaforth; and Richard Vanzanten, Murralon Place, Lane Cove, all of New South Wales, Australia Filed Nov. 14, 1966, Ser. No. 534,216 Claims priority, application Australia, Nov. 15, 1965,

,524/ 65 Int. Cl. B21d 5/08 U.S. Cl. 29-200 3 Claims ABSTRACT OF THE DISCLOSURE A die for making extended lengths of composite metal sections with a passage having an entry end and an exit end. The entry end is adapted to receive an inner metal section and sheet metal to cover with a close fit part or all of the inner section. Means are provided for covering the sheet metal with a close fit part or all of the inner section as the section and the sheet metal are drawn through the die. The entry end is approximately similar in shape but larger in size than the composite section and the passage near the exit end is substantially identical in size and shape with the composite section. The covering means includes a pluarity of rollers rotatably mounted on and within the die, each adapted to engage an adjacent part of the sheet metal and swage it against an adjacent part of the metal section wih a close fit. The drawing and swaging die apparatus has lubricating rollers and elongated tapered drawing die halves fastened together having parallel tapered swaging rollers for swaging edges of stainless steel strips to an angle of 45 about edges of an aluminum extrusion, and parallel cylindrical rollers to force the bent edges hard against walls of a channel in the aluminum extrusion. The drawing die passage tapers slightly toward the exit end thereby forcing the stainless steel strips hard against the surface of the aluminum extrusion.

This invention relates to the production of extended lengths of composite metal sections, for example, aluminum extrusions, covered externally by closely fitting sheet metal, for example, stainless steel.

It is already known to make articles such as shop counter edges, stairway hand rails and the like comprising a timber core partly surrounded by a close fitting metal skin.

The normal procedure for making such a composite structure is to place the core initially on unfolded sheet metal cut to the required size. A relatively thin die plate is formed with a passage through it corresponding in size and shape to the finished composite product. The end of the timber so that, in the finished article, the skin fits corresponding end of the sheet metal is cut away roughly and folded roughly by hand tools so as to loosely clasp the cut away end of the timber.

The. reduced end of the rough composite article is then pushed through the die opening and attached to a conventional traction device. The workpiece is then drawn steadily through the opening. The sheet metal skin clasps the timber closely and the free edges of the metal bite into the timber so hat, in the finished article, the skin fits tightly around the timber and the long edges of the skin secure the metal to the timber.

Faced with the problem of making somewhat similar composite articles in which the core material was metal instead of timber, it was found that the dies used for making the composite article of metal and timber were not suitable. The die for the present invention has been designed to overcome this problem.

3,505,719 Patented Apr. 14, 1970 An object of the invention is to use rollers to assist to form the outer skin to the profile of the metal core and the present application is concerned with a form of the invention using such rollers as well as nibs with the simpler basic form.

A further object is a die for making extended lengths of composite metal sections, the die having a passage therethrough with an entry end and an exit end, the entry end being adapted to receive an inner metal section and sheet metal to cover with a close fit part or all of the inner section and means for covering with the sheet metal and with a close fit part or all of the inner section as the sec tion and the sheet metal are drawn through the die.

Several practical embodiments of the invention are illustrated in the accompanying drawings in which:

FIGURE 1 is a perspective view of the swaging and drawing die being used to secure a metal sheet to two sides of a typical metal extruded section;

FIGURE 2 is a plan view of the lower half only of the die;

FIGURE 3 is an end elevation in section on the line 3-3 in FIGURE 2;

FIGURES 4 to 10 inclusive illustrate a variety of typical extruded metal sections to which sheet metal covers have been applied, by roller equipped dies, shaped to suit each section;

FIGURE 11 is a front elevation of the outlet face of a basic form of the die which does not need rollers, showing a sheet metal cover being applied to a simple extrusion; and

FIGURE 12 is a plan view in section on the line 12-12 in FIGURE 11; the metal extrusion etc., not being shown in this view.

In the typical example of the practice of the invention illustrated, an extruded aluminum section 4 is to be covered on both sides 5 and 6 by sheaths of stainless steel sheeting 7 and 8.

The die 9 used to perform this function comprises an upper and a lower metal block 10 and 11 respectively secured together by bolts 12. The contiguous faces of the blocks 10 and 11 are hollowed out as at 13 and 14 to form a drawing passage 15.

The aluminum section 4 is passed through the passage 15 and a drawing cable 16 (see FIGURE 1) is attached to its free end by a suitable securing device 17 of known form. Two sheets of stainless steel 7 and 8 are fed past a lubricating roller 18 and into the flared entrance 19 of the passage 15. The flared sides 20 of the die passage 15 causes the marginal edges 21 of the sheets 7 and 8 to be folded about the marginal edges 22 of the aluminum extrusion 4.

In order to fold the stainless steel into the side openings 23 of the aluminum extrusion 4, tapered swaging rollers 24 are rotatably mounted on pins 25 secured to the die blocks 10 and 11. The action of the rollers 24 is to swage the stainless steel sheets 7 and 8 to an angle of 45 about the aluminum extrusion edges 22.

Further along the die, sets of parallel swaging rollers 26 force the stainless steel sheets 7 and 8 hard against the walls of channel 23 in the aluminum extrusion 4 as shown in FIGURE 3. The walls 27 of the die passage 15, between the rollers 26 and the exit end 28 of said passage, taper slightly toward the said passage exit 28. The drawing action of this passage section 27 forces the stainless steel sheets 7 and 8 hard against the surface. of the aluminum extrusion 4.

It will be seen that only those aluminum sections having side openings similar to those shown at 23 can be sheathed with sheet metal according to the method revealed by this invention. This is because of the relative incompressibility of a metal extrusion which prevents the conditions from occurring which would enable a metal sheath to clasp itself about said extrusion.

It would however be possible to cover a rectangular or square section provided a small longitudinal lip, or alternatively, a groove was provided at a convenient point about its periphery into which, or about which, the stainless steel could be swaged.

The above specific description relates to the production of a composite section as in FIGURE 3.

As shown in FIGURES 4 to other sections 4A can be produced using ditferent numbers of rollers which may be disposed in different positions according to the various composite section 4A to be produced. Sheaths of stainless steel sheet 7A can be applied to the sections 4A as shown in the drawings.

A basic form of the die without rollers is shown in FIG- URES 11 and 12. The die 29 is of suitable steel and includes a lower block 30 approximately 2" square and 1" thick. A U-shaped recess 31 is cut into the top of the block 30 between its sides 32 and this recess 31 is subsequently closed across the top of the block 30 by a second block 33 which is detachably secured to the first block 30 by screws 34 passing through the second block 33 into screwed holes in the first block 30. The shape and size of the recess 31 on the outlet side 35 of the composite block corresponds to that of the completed article. On the inlet side 36 the recess 31 is similarly shaped, but is made somewhat larger than the finished article to permit the entry of the shaped basic section 37 and the partially shaped outer skin 38. The dimensions of the recess 31 transverse to the direction of movement of the workpiece 37 are gradually reduced from the inlet side 36 to the outlet side 35. The inlet side 36 may be rounded as at 39 to facilitate entry of the workpiece 37 and the metal skin 38.

As the two components 37 and 38 of the composite product are drawn through the die 29 they may be suitably lubricated. In some cases lubrication is essential.

We claim:

1. A die for making extended lengths of composite metal sections comprising a passage through said die having an entry end and an exit end, said entry end being adapted to receive an inner metal section and sheet metal to cover with a close fit part of said inner section, means for covering said sheet metal with a close fit part of said inner section as the section and the sheet metal are drawn through the die, said entry end being approximately similar in shape but larger in size than the composite section, said passage near said exit end being substantially identical in size and shape with the composite section and said covering means including a plurality of rollers rotatably mounted on and within said die, each adapted to engage an adjacent part of said sheet metal and swage it against an adjacent part of said metal section with a close fit.

2. A die as in claim 1 wherein said covering means also includes a passage portion gradually reducing in size for some distance inwards from said entry end to a size not less than that of said composite section.

3. Drawing and swaging die apparatus comprising lubricating rollers and elongated tapered drawing die halves fastened together having parallel tapered swaging rollers for swaging edges of stainless steel strips to an angle of about edges of an aluminum extrusion, and parallel cylindrical rollers to force the bent edges hard against walls of a channel in the aluminum extrusion, and a drawing die passage tapering slightly toward the passage exit, thereby forcing the stainless steel strips hard against the surface of the aluminum extrusion.

References Cited UNITED STATES PATENTS 910,814 1/1909 Hellmich 29202.5 X 2,031,567 2/1936 Liedle 29202.5 X 2,749,961 6/1956 Czarnik 29-335 2,948,324 8/1960 Penrose 72-178 3,004,324 10/ 1961 Macomber 29- 1 3,060,991 10/1962 Chausson.

3,332,138 7/1967 Garner.

THOMAS H. 'EAGER, Primary Examiner U.S. Cl. X.R. 29-208; 72178

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