DE2520227C3 - Machine for pulse-like pressure forming of workpieces - Google Patents

Description

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The invention relates to a J a machine for pulsed Druckumfot -mm of workpieces with a housing having an in ^i: .m accommodated "explosion chamber which is periodically connected to the pressure chamber of a cylinder, the piston of which carries a tool which one with a to Traverse attached counter tool cooperates, as well as with a device for returning the piston in * o the starting position. Such a machine is known in a horizontal version from DE-AS 19 04 581 and in a standing version from DE-AS 2125 45 «.

Machines of this type are preferably used for high-speed cutting of semi-finished products Shape and profile steel, especially when cold.

In the known horizontal design, the housing and the traverse are rigidly connected to one another and mounted on rollers in such a way that, when an impact is triggered, they come together along the axis of the cylinder due to the recoil in the explosion in the explosion chamber against the plunger can roll. In the standing version there is a counter-rotating movement of the machine parts is possible through an appropriate suspension.

Since the plunger with the tool and the housing with the traverse and the counter tool have different masses, the tool and counter tool are accelerated to different speeds and meet at any point between their starting positions at which the workpiece must be arranged. Accordingly, since the workpiece can not be arranged in counter-tool, which usually represents a die, ⁶ ^ difficulties arise particularly when a high machining precision is required at involved shaped workpieces.

In addition, since the housing of the machine is supported by the accelerations or decelerations that occur when the impact is exerted, all are on it arranged assemblies (explosion chamber with an overflow device, a filling and a Decompression valve as well as pipelines) are also exposed to the impact loads, what their Shortened service life and requires a complex construction

Finally, the known machines have relatively large measurements for a given work performance and insufficient rigidity due to their design

The object of the present invention is to eliminate the disadvantages mentioned and to provide one Machine for pulse-like pressure forming of workpieces of the required design, in which the to machined workpieces arranged precisely and consequently workpieces with a complicated configuration can be edited. In addition, the impact loads on the machine housing and the Units and pipelines mounted on it are reduced, thereby improving their service life will.

Starting with a machine of the type mentioned at the outset, this problem is solved proposed according to the invention that the housing and the traverse are rigidly attached to the bed and the The pressure chamber of the cylinder is open on both sides and the opening connecting it to the explosion chamber, for example lies in the middle of its length, v / above in the pressure chamber with respect to the axis of the mentioned opening opposite a second piston of the same type with a second tool is arranged, which is attached to a counter tool on a second cross member cooperates and that the crossbars are rigidly connected to one another.

With such a design, the housing with the explosion chamber and the crossbars remain with the Counter tools immobile during machining, which allows the workpieces to be machined to be arranged directly in the counter tools and thereby to increase the machining accuracy of the same considerably and to machine workpieces of a complicated configuration.

In addition, this solution increases the performance of the machine with only a small increase in its size Length is almost twice as long and allows shaped and profile steels to be carried out in the cold state according to the two-cut pattern, in which the tool cut a narrow strip from the workpiece to be cut in two parallel cutting planes, the workpiece remains immobile and is therefore not subjected to deformations due to inertial loads. It can be lengthwise accurate Semi-finished products with high cutting quality can be obtained.

Appropriately, the crossbars are connected to each other by means of horizontal columns, which through through openings in the housing are free. In this training there are impact loads of the housing and the explosion chamber with their Aggregates and pipelines excluded, which improves their working conditions, the service life increased and enables the use of units of a simpler construction. In addition, the cross-sectional dimensions of the machine can be reduced.

In itself, DE-OS 20 28 477 is a machine

known with two processing points located symmetrically to a central plane, but it is here A crank or eccentric driven double press, its construction and mode of operation is different and in which the problems considered here do not arise.

The invention is explained below through the description of an exemplary embodiment with reference to the drawing further explained It shows

F i g. 1 schematically shows the sectional representation of a horizontal machine for pulse-type pressure forming of workpieces in the starting position (longitudinal section);

F i g. 2 shows the section along line H-II in FIG. 1.

The machine under consideration for cutting shaped and profile steel has a horizontal bed 1 on which a Housing 2 and on both sides of this two traverses 3 and 4 in the form of at equal intervals vertically arranged plates are rigidly attached. These are rigid with one another by means of four horizontal columns 5 tied together. The columns are freely let through through openings made in the housing 2.

In the upper part of the housing 2 there is an explosion chamber 6 with a decompression valve 7, an intake valve 8 and a spark plug 9.

Below the explosion chamber 6 in the housing 2 is the pressure chamber 10 of a horizontally lying cylinder 11 arranged, which is designed to be continuous and open to the cross members 3 and 4 and the one with the explosion chamber 6 by means of an opening 12 with an overflow device 13 communicates. The axis 12 'of this opening 12 is in the middle of the length of the Pressure chamber 10 of the cylinder 11.

With respect to the axis 12 ', two identical pistons 14 and 14 are located opposite one another in the cylinder 11 15, each of which has a tool 16 at its end facing the adjacent cross member 3 or 4 or 17 carries the tools 16 and 17 are z. B. Stamp of the same dimensions.

On each traverse 3 and 4, counter-tools 18 are coaxial with the respective tool 16 and 17 or 19 rigidly attached, the z. B. represent matrices in which workpieces 20 and 21 to be cut are arranged.

On the bed 1 are two hydraulic cylinders 22 and 23 for returning the pistons 14 and 15 with their Tools 16 and 17 arranged in the starting position.

The explosion chamber 6 is through a pipeline

connected to a (not shown) source of a suitable energy carrier, e.g. B. a fuel gas-air system

ϊ mixed, a gasoline-air mixture or powder or the like

The working cycle of the machine begins with the two counter tools. 18 and 19 in the for Plane of the drawing perpendicular direction to be machined-Ki border workpieces 20 and 21 are supplied.

Thereafter, the connection of the chamber 6 with the pressure chamber 10 of the cylinder 11 by closing the Opening 12 interrupted by the overflow device 13, the chamber 6 by the decompression valve til 7 separated from the surrounding space and by means of the inlet valve 8 with the source of the energy carrier in Connection set

After the energy carrier has flowed into the

Explosion chamber 6 is this from the spark plug 9

2i) ignited and an explosion takes place

The gases developing in the process run under high pressure through the opened opening 12 into the Pressure chamber 10 of cylinder 11 between pistons 14 and 15. These are driven apart and

2 ^r > accelerated synchronously to the counter tools At the end of the work process, the workpieces 20 and 21 are cut in the counter tools.

The reaction forces generated during cutting are absorbed by the horizontal columns 5, «Ι which connect the crossbars 3 and 4 to one another, while the housing 2 does not have any impact loads learns that the columns 5 are freely let through through the openings made in it.

Thereafter, by means of the decompression valve 7, the

«Explosion chamber 6 is connected to the surrounding space and the gases used are released from chamber 6. After that, hydraulic cylinders 22 and 23 are turned on, their Piston rods attack the lateral extensions of the pistons 14 and 15 and insert them into the. Starting position bring. The used gases are removed from the

Pressure chamber 10 of the cylinder 11 through the opening 12 in the explosion chamber 6 and further through the decompression valve 7 into the environment.

After this, the cut workpieces 20 and 21 are removed from the counter tools 18 and 19, men, and the machine is ready for a next work cycle.

1 sheet of drawings

Claims (2)

Patent claims: 1, machine for pulse-type pressure forming of workpieces with a housing with an in explosion chamber housed in it, which is periodically connectable to the pressure chamber of a cylinder, the piston of which carries a tool, which cooperates with a counter tool attached to a cross member and with a device for returning the piston to the output in position, characterized in that the housing (2) and the cross member (3) on the bed (1) are rigidly attached and the pressure chamber (10) of the cylinder (11) is open on both sides and which it with the Opening (12) ΐί connecting the explosion chamber (6) lies approximately in the middle of its length, in the pressure chamber (10) with respect to the axis (12) of the Opposite mentioned opening (12) a second piston (15) of the same type with a second one Tool (17) is arranged, which is attached to a second traverse (4) with a second Counter tool (19) cooperates and that the cross members (3, 4) are rigidly connected to one another. 2. Machine according to claim 1, characterized in that the cross members (3, 4) by means of horizontal ler pillars (5) are interconnected by through openings in the housing (2) are allowed to pass freely.