Multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered

Abstract

A multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered comprising a press body (1) surmounted by a worktable (2), having a superior surface (3) and an inferior surface (4), on the worktable (2) being positioned horizontally an operating hydraulic cylinder and, in correspondence with a through opening (70), a bridge (8) to which inferiorly a superior jaw (12) having its concavity facing downward, is rigidly connected. Opposite to the bridge (8) a support element (13) extends under the inferior surface (4) and supports a clamping hydraulic cylinder (14), having a rod (15) facing upward and provided with an inferior jaw (16), being sledge vertically inside said bridge (8) toward the superior jaw (12) and away from it.

Description

[0001] This invention relates to a multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered.

[0002] The present multipurpose horizontal presses are provided with a hydraulic operating cylinder that is located horizontally on the worktable. The hydraulic operating cylinder is interlocked to a N/C unit. The rod of the hydraulic operating cylinder has at its end a work head on which the movable part of a die used in each single machining operation is fixed. The correspondent fixed part of the die is locked on the worktable, in which holes acting as seat for such a fixed part of the die are suitably made.

[0003] The present horizontal presses allow many deformation works such as pressing, bending, punching, shearing and further drawing and tapering. In the present multipurpose horizontal presses the fixed workpiece-holder is provided permanently with a result that the last one occupies uselessly space on the worktable that can be used for other operations when drawing or tapering must be performed.

[0004] Some horizontal presses have workpiece-holders for drawing and tapering completely removable from the press. However this implies longer machining times than with a permanent workpiece-holder.

[0005] The present invention aims to overcome the drawbacks resulting from the above mentioned need of locating a workpiece-holder for drawing and tapering on a worktable of a multipurpose press.

[0006] In particular, an object of the present invention is to avoid the drawback of a permanent presence of a workpiece-holder for drawing and tapering on a worktable.

[0007] Another object of the invention is to avoid the need of a complete removal of a workpiece-holder for drawing and tapering when this kind of machining is not required.

[0008] A further object of the invention is to reduce the machining times of drawing and tapering and to make easier the use of the horizontal press.

[0009] The present invention provides a multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered comprising a press body surmounted by a worktable, having a superior surface and an inferior opposite surface, on the worktable being positioned horizontally an operating hydraulic cylinder with a rod having a work head which is pre-set for the mounting of a movable part of dies designed to co-operate with a fixed part of the same dies that is locked in holes made in the worktable, in a deformation work of material put between said fixed part and said movable part, characterized in that the horizontal press comprises in correspondence with a worktable through opening made in front of the work head opposite to the rod of the operating cylinder:

[0010] a bridge extending over the superior surface of the worktable by means of a pair of uprights connected by a cross member to which inferiorly a superior jaw having its concavity facing downward, is rigidly connected;

[0011] a support element extending under the inferior surface of the worktable opposite to the bridge;

[0012] a clamping hydraulic cylinder, supported by the support element and having a rod facing upward and provided with an inferior jaw, having its concavity facing upward, being sliding vertically inside said bridge toward said superior jaw and away from it.

[0013] The invention will now be described with reference to a preferred embodiment thereof, although it must be understood that modifications can be made without departing from the spirit of the invention and referring to the figures of the accompanying drawings, in which:

[0014] FIG. 1 shows a perspective view of a multipurpose horizontal press having a workpiece-holder assembled according to the invention;

[0015] FIG. 2 shows a perspective view of the horizontal press of FIG. 1 having the workpiece-holder that is disassembled;

[0016] FIG. 3 shows a longitudinal cross section of the horizontal press of FIG. 1;

[0017] FIG. 4 shows in an enlarged fragmentary perspective view a longitudinal cross section of the horizontal press of FIG. 1; and

[0018] FIG. 5 shows in an enlarged fragmentary cross-sectioned front view an embodiment of the workpiece-holder according to the invention.

[0019] Referring to the drawing, a horizontal press according to the invention is generally shown in FIG. 1. A body of the press, that is surmounted by a worktable 2, is designed as 1.

[0020] As shown in FIG. 3, the worktable 2 has a superior surface 3 and an opposed inferior surface 4.

[0021] An operating hydraulic cylinder whose rod 5 holding a work head 6 is positioned horizontally on the worktable 2. Generally the movable part of forming dies such as for pressing, bending, punching and shearing operations is connected to the work head 6. This movable part of the dies is designed to co-operate with a fixed part of the same dies, the last one being locked in holes made on the worktable such as those that are generally indicated as 7 in the figures. Both the movable and fixed parts of the forming dies are not shown in figures.

[0022] A workpiece to be subjected to a deformation work is put between the movable part and the fixed part on the horizontal press.

[0023] According to the invention, in addition to the holes well known to the prior art, a through opening 70 that is better shown in FIGS. 2 and 4 is performed in the worktable 2.

[0024] The through opening 70 is made in worktable 2 in front of the work head 6 in the opposite side with respect the rod 5 of the operating cylinder.

[0025] A bridge 8 extending over the superior surface 3 of the worktable 2 is made in correspondence with the opening 70 in the worktable 2.

[0026] As shown in particular in FIG. 1, the bridge 8 is made of a pair of uprights 9 and 10 connected by a cross member 11. The uprights 9, 10 are connected by screws to the worktable in not shown but conventionally manner. The cross member 11, in turn, is fixed on the uprights, as shown in FIGS. 1 and 4 or alternatively is made integral with them.

[0027] The cross member 11 has in its inferior side a jaw 12 facing downward with its concavity.

[0028] A support element generally designed as 13 is fixed under the worktable 2, opposite to the bridge 8.

[0029] The support element 13 supports a hydraulic cylinder 14 clamping the present workpiece-holder. The clamping hydraulic cylinder 14 has its rod 15 extending upward. The rod 15 in its free end has an inferior jaw 16 that is a mirror image of the superior jaw 12, i.e. having its a concavity facing upward.

[0030] By virtue of a preferably releasable connection of the inferior jaw 16 with the rod 15 of the clamping hydraulic cylinder 14, the inferior jaw 16 can slide vertically toward the superior jaw 12 and away from it. The vertical reciprocating motion of the inferior jaw 16 is assured by prismatic guides as shown by a projection 17 and a sliding recess designated as 18 in FIG. 4, that is correspondingly sized and shaped to the projection 17.

[0031] The inferior jaw 16 has usually a semicylindrical concavity with the same radius of the superior jaw 12, in order to clamp a tubular workpiece P to be drawn or tapered by a matrix indicated as 19, that is assembled for this operation onto the work head 6, as shown in FIGS. 1 and 3.

[0032] As better shown in FIG. 3, the clamping hydraulic cylinder 14 is driven through feed/discharge conducts 20, 21 that are connected to a hydraulic unit 22, to drive a hydraulic motor 23. There is a control board 24 of a N/C unit 25, as shown in FIG. 3.

[0033] When any drawing or tapering operation is not performed by the multipurpose horizontal press, in order to use as far as possible the worktable, the bridge 8 is disassembled. Plates covering the through opening 70, such as those designed as 26 in FIG. 2 for example, can be applied onto the worktable. The inferior jaw 16 can remain connected to the rod 15 of the clamping hydraulic cylinder. Alternatively it can be disassembled therefrom.

[0034] The bridge 8 can be used with jaws having different sizes and radius. In the operation of the clamping hydraulic cylinder 14 the thrust from the operating cylinder through its rod 5 can be taken up by the uprights 9 and 10 of the bridge 8.

[0035] As above mentioned, the uprights 9 and 10 and the cross member 11 can be integral.

[0036] In FIG. 5 in which parts corresponding to those in the other figures are indicated with like ore similar reference numbers an embodiment of bridge 80, which is connected to worktable 2 by releasable coupling means in particular threaded coupling means, is shown.

[0037] A bridge 80 extending over the opening 70 in the worktable 2 is made of a pair of uprights 90 and 100 connected by a cross member 110. Blocks 120, 121 connected by screws to the worktable 2 such as the one designed as 122, are joint laterally by welding to the uprights 90, 100. The cross member 110 is fixed on the uprights by screws, such as the one designed as 123.

[0038] The cross member 110 has a jaw 124 facing downward with its concavity that is connected e.g. through a hexagonal-head socket screw 125.

[0039] A support element generally designed as 130, that is connected likely by screws to the worktable 2, is fixed under the worktable 2, opposite to the bridge 80.

[0040] The support element 130 supports a hydraulic cylinder 140 clamping the present workpiece-holder. The rod 150 of the clamping hydraulic cylinder 140 has an inferior jaw 160. The vertical reciprocating motion of the inferior jaw 160 is assured by prismatic guides constituted by opposite projections 170 and a sliding recesses 180.

[0041] The horizontal thrust applied by the operating cylinder during the drawing or tapering operation that is not used to deform the workpiece, is discharged on the prismatic guides 170-180.

Claims

1. Multipurpose horizontal press having a fixed workpiece-holder for a tubular workpiece to be drawn or tapered comprising a press body (1) surmounted by a worktable (2), having a superior surface (3) and an inferior opposite surface (4), on the worktable (2) being positioned horizontally an operating hydraulic cylinder with a rod (5) having a work head (6) which is pre-set for the mounting of a movable part of dies designed to co-operate with a fixed part of the same dies that is locked in holes (7) made in the worktable (2), in a deformation work of material put between said fixed part and said movable part, characterized in that the horizontal press comprises in correspondence with a worktable through opening (70) made in front of the work head (6) opposite to the rod (5) of the operating cylinder: a bridge (8) extending over the superior surface (3) of the worktable (2) by means of a pair of uprights (9, 10) connected by a cross member (11) to which inferiorly a superior jaw (12) having its concavity facing downward, is rigidly connected; a support element (13) extending under the inferior surface (4) of the worktable (2) opposite to the bridge (8); a clamping hydraulic cylinder (14), supported by the support element (13) and having a rod (15) facing upward and provided with an inferior jaw (16), having its concavity facing upward, being sliding vertically inside said bridge (8) toward said superior jaw (12) and away from it.

2. Multipurpose horizontal press according to claim 1, characterized in that said bridge (8) is connected to the worktable (2) by releasable coupling means.

3. Multipurpose horizontal press according to claim 2, characterized in that said releasable coupling means are threaded coupling means.