US3893328A

US3893328A - Swaging tool

Info

Publication number: US3893328A
Application number: US468398A
Authority: US
Inventors: Gottfried Blaimschein
Original assignee: GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
Current assignee: GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
Priority date: 1973-05-17
Filing date: 1974-05-09
Publication date: 1975-07-08
Anticipated expiration: 1992-07-08
Also published as: DE2419555A1; JPS5019656A; FR2229482A1; AT320383B

Abstract

The tool is intended for use in a continuous swaging machine for swaging bar stock which is four-sided in cross-section. The tool has a hammer face formed with a continuous groove having an entrance portion which is V-shaped in cross-section, and an exit portion having lateral edge beads and a flat bottom, which merges continuously into said edge beads. Said entrance portion merges continuously into said flat bottom.

Description

United States Patent Blaimschein July 8, 1975 [54] SWAG'NG TOOL FOREIGN PATENTS OR APPLICATIONS lnvemori i r Blaimscbfiin, 1,960,418 6/197] Germany 72/402 ustrla [73] Asslgnee: giwgfifggfgmfi Primary Examiner-Lowell A. Larson Maschinenbau Aktiengesenschafi Attorney, Agent, or Firm-Kurt Kelman Steyr, Austria [22] Filed: May 9, 1974 [57] ABSTRACT [2]] App]. No.: 468,398

The tool is intended for use in a continuous swaging [30] Foreign Application P i i D machine for swaging bar stock which is four-sided in M 17 1973 Austria 4341/73 cross-section. The tool has a hammer face formed ay with a continuous groove having an entrance portion which is V-shaped in cross-section, and an exit portion [3] having lateral g beads and a flat bottom. which 406 merges continuously into said edge beads. Said enl 0 care 6 trance portion merges continuously into said flat bottom.

[56] References Cited UNITED STATES PATENTS 3 Claims, 6 Drawing Figures 3,114,276 [2/1963 Uebing et a]. 72/404 PATENTETIJUL a 1975 3, 893 328 sum 1 FIG] 3a 3b 4 s 3 m! 2 Lu FIG] 1 SWAGING TOOL This invention relates to a tool for use in continuous swaging machines for swaging bar stock which is foursided in cross-section. comprising two pairs of hammers acting at right angles to each other. each of said hammers having a face formed with a notch, which extends in the direction of travel of the workpiece and is V-shaped in cross-section at the entrance end and merges into a flat exit end.

Such tools are mainly used to make bar stock which is square in cross-section and in this case enable a thorough swaging particularly adjacent to the diagonals. A large deformation of the diagonals is highly significant because discontinuities and impurities tend to accumulate adjacent thereto and this must be counteracted. The starting stock to be subjected to continuous swaging consists in most cases of continuously cast billets, which contain dendrites extending at right angles to the outside surfaces of the square cross-section. These dendrites are formed during the casting operation. They meet adjacent to the diagonals of the cross-section and result in undesired defects in the structure. Owing to the provision of the wedge-shaped notch which merges into a flat exit end. the edge portions of the starting stock are swaged to enter the side faces of the resulting square continuous stock so that the largest reduction of material and a satisfactory structure are obtained par ticularly adjacent to the diagonals of the cross-section.

The great disadvantage of these previously disclosed tools resides in that they can be used to produce only sharp-edged bar stock and such stock is not well suited for further processing. Because the bar stock is rolled in most cases after it has been swaged. sharp edges are most undesirable as they contribute to flaws and rolling defects.

It is an object ofthe invention to eliminate this disadvantage and to provide a tool which is of the kind de fined first hereinbefore and which enables a production of bar stock which is highly satisfactory for a further processing.

This object is accomplished by the invention substantially in that the notch is extended in length to form a continuous groove in the tool, and the bottom of the groove merges continuously into lateral edge beads adjacent to the flat portion of the groove. The use of the continuous groove results in an improved flow and spreading of the material, and the edge beads provide for a good guidance of the workpiece also at the exit. Besides. the edge beads enable a controlled shaping of the transition from one side face to the other with such a curvature that a formation of sharp edges is avoided. As a result. there is no longer a danger of edge cracks or the like during a further processing of the swaged bar stock.

It will be particularly satisfactory if the edge beads have inside surfaces which contact the workpiece and which include with the flat bottom of the groove an angle of at least 135 because that design avoids an overlap of the ranges of action of adjacent tools adjacent to the edges of the bar stock so that a scraping on the stock is avoided.

An embodiment of the tool according to the invention is shown on the accompanying drawing, in which FIG. I is a partly sectional side elevation,

FIG. 2 is a top plan view,

FIG. 3 is an end view and FIGS. 4 to 6 are transverse sectional views taken through the groove in the tool on lines lV-IV. VV, and VI-VI in FIG. 1.

The tool 1 provided according to the invention for use in continuous swaging machines has a groove 2, which is elongated in the direction of travel of the workpiece and extends longitudinally over the entire hammer face of the tool. The groove 2 merges from an initial V-shape or wedge shape 3 at its open entrance. into a flat bottomed shape 3b and its included angle in creases from about to I80". In the exit portion of the groove, the flat bottom wall 4 of the groove merges into projecting lateral edge beads 5.

The special shape of the groove in that tool 1 permits of a making of square bar stock to a highly precise shape. The edge portions 6 of the initial cross-section 7 are swaged to enter the side faces 8 of the final crosssection. (The initial and final cross-sections are indicated by dash-dot lines in FIG. 3). This results in the desired large reduction adjacent to the diagonals. Owing to the action of the edge beads whose inside surfaces constitute the side walls of the groove exit and include an oblique angle of at least with the bottom of the groove, the swaged bar stock has well rounded transitions from one side face to the other so that there will be no risk of a formation of edge cracks during a further processing.

What is claimed is:

l. A tool for use in a swaging machine for swaging four-sided bar stock. said tool comprising a tool member having a hammer face formed with an elongated groove open in both longitudinal directions. the cross section of said groove at one longitudinal end being V- shaped, and said groove having a flat bottom wall at the other longitudinal end. lateral bead portions of said tool member projecting from said bottom wall at the other longitudinal end of said groove and constituting side walls of saidgroove. said -shaped cross section merging along said groove into said bottom wall and said side walls.

2. A tool as set forth in claim 1. wherein each of said side walls and said bottom wall define an oblique angle of at least l35.

3. A tool arrangement for a swaging machine comprising two pairs of tools as set forth in claim 1, hammer faces of the tool members in each pair being directed toward each other. the hammer faces of said two pairs of tools jointly bounding a path for the bar stock to be swaged, the tool members of each pair being adapted to be moved toward and away from each other transversely to said path, said grooves of said tool members being parallel to each other and to said path.

* l= II

Claims

1. A tool for use in a swaging machine for swaging four-sided bar stock, said tool comprising a tool member having a hammer face formed with an elongated groove open in both longitudinal directions, the cross section of said groove at one longitudinal end being V-shaped, and said groove having a flat bottom wall at the other longitudinal end, lateral bead portions of said tool member projecting from said bottom wall at the other longitudinal end of said groove and constituting side walls of said groove, said -shaped cross section merging along said groove into said bottom wall and said side walls.

2. A tool as set forth in claim 1, wherein each of said side walls and said bottom wall define an oblique angle of at least 135*.

3. A tool arrangement for a swaging machine comprising two pairs of tools as set forth in claim 1, hammer faces of the tool members in each pair being directed toward each other, the hammer faces of said two pairs of tools jointly bounding a path for the bar stock to be swaged, the tool members of each pair being adapted to be moved toward and away from each other transversely to said path, said grooves of said tool members being parallel to each other and to said path.