EP4201548A1 - Punching tool - Google Patents

Abstract

The present invention relates to a punching tool (1) for mobile use, comprising - a cylinder (11), - an adapter (13a) with attachment means (13b) attached thereto, the adapter (13a) at its first end being at least partially in the Cylinder (11) can be introduced, - optionally a spacer sleeve (15) which has a receiving opening (151) for the adapter (13a) and a passage (153) for the fastening means (13b), - a die (17) which has a Has passage (173) for the fastening means (13b) and a cavity (171), and- a punch (19) which can be connected to the fastening means (13b), characterized in that optionally the spacer bushing (15) or the die ( 17) held to the cylinder (11) by first magnetic means (21).

Description

The invention relates to a punching tool for mobile use, which has improved handling compared to conventional punching tools.

From punches known from the prior art, such as are used in sheet metal processing, it is known that during the processing operation the material to be processed, in particular sheet metal, is pressed by a mechanical force from a stamp into a corresponding die , which is arranged behind the material to be punched.

However, these known punches have a number of disadvantages, for example the large amount of space required for stationary sheet metal working machines, which increases the more the overhang of the tools (maximum workable edge distance) is. In contrast to this, the known mobile punches often have a very small mouth depth and thus allow material processing, in particular sheet metal processing, only in the edge region of the material.

This should be remedied by generic hydraulic or pneumatic hole punches for mobile use. In mobile punches, the punch is connected to the hydraulic cylinder by a screw or bolt, whereby the material to be punched must already have a pre-drilled hole through which the screw or bolt is inserted. In this way, the punch is drawn directly into the die. The need for a pre-drilled hole is often cited as a disadvantage here.

Such generic stamping tools are known per se from the prior art. For example, describes EP 3 025 824 B1 a mobile hydraulic tool with a drive piston that can be hydraulically adjusted between an initial position and an end position, a hydraulic tool housing having a cylinder section guiding the drive piston, and a pulling or pressing tool unit that can be detachably connected to the drive piston and the hydraulic tool housing.

For punching it is necessary to attach an assembly of cylinder, adapter with fastener, spacer and die to the material to be punched bring up and lead to the fastener through an existing hole before the stamp is then connected to the fastener on the opposite side of the material to be punched. When approaching and carrying through, parts of the assembly can fall down due to careless operation, especially the spacer and die, which not only interrupts the process, but can also cause damage to the material to be punched and the individual components.

There is therefore a need for an inexpensive and effective solution to the above-mentioned practical technical problems.

The present invention is therefore based on the object of providing an improved punching tool for mobile use, in which no parts of an assembly can fall off, even if the worker is careless.

• einen Zylinder (11),
• einen Adapter (13a) mit daran angebrachtem Befestigungsmittel (13b), wobei der Adapter (13a) an seinem ersten Ende zumindest teilweise in den Zylinder (11) einbringbar ist,
• optional eine Distanzbuchse (15), welche eine Aufnahmeöffnung (151) für den Adapter (13a) und eine Durchführung (153) für das Befestigungsmittel (13b) aufweist,
• eine Matrize (17), welche eine Durchführung (173) für das Befestigungsmittel (13b) und einen Hohlraum (171) aufweist, und
• einen Stempel (19), welcher mit dem Befestigungsmittel (13b) verbindbar ist,

dadurch gekennzeichnet, dass optional die Distanzbuchse (15) oder die Matrize (17) durch erste magnetische Mittel (21) an dem Zylinder (11) gehalten wird.This object is achieved in the present invention by a punching tool (1) for mobile use, comprising

• a cylinder (11),
• an adapter (13a) with fastening means (13b) attached thereto, wherein the adapter (13a) can be inserted at least partially into the cylinder (11) at its first end,
• optionally a spacer bushing (15) which has a receiving opening (151) for the adapter (13a) and a passage (153) for the fastening means (13b),
• a die (17) having a passage (173) for the fastener (13b) and a cavity (171), and
• a stamp (19) which can be connected to the fastening means (13b),

characterized in that optionally the spacer sleeve (15) or the die (17) is held on the cylinder (11) by first magnetic means (21).

According to the invention, the cylinder (11) is a hydraulic or pneumatic cylinder which is designed to pull the stamp (19) into the die (17) by means of an adapter (13a) and fastening means (13b) attached thereto.

According to the invention, the adapter (13a) is used to create a connection between the fastening means (13b) and the cylinder (11).

The fastening means (13b) is anchored on one side in the adapter (13a), on its side remote from the cylinder (11) it has a device for the non-positive connection of the plunger (19).

According to the invention, height differences are compensated for with the spacer bushing (15) in order to optimize the positioning of the stamp (19) and, if necessary, to compensate for the difference in a remote fastening means (13b).

The spacer bushing (15) is optionally provided in a simple embodiment of the present invention. In this case the matrix (17) is held directly on the cylinder (11) with the first magnetic means (21).

The "first magnetic means" (21) is in particular one or more magnets which are provided in at least one of two adjacent components. The arrangement of the first magnetic means (21) can be radial or axial.

If the components are made of a ferromagnetic material, magnets in one of the two components are sufficient; if the components are not made of a ferromagnetic material, at least ferromagnetic sections are introduced in the components opposite the magnet(s).

The present invention has the advantage, first of all, that the spacer bushing (15) is held on the cylinder (11) in a simple manner by the first magnetic means (21), the spacer bushing (15) in turn holding the adapter assembly (13a ) with attachment means (13b) attached to it. Consequently, none of these components can accidentally fall off the punching tool according to the invention. In addition, it is possible to retrofit already existing conventional stamping tools, for example by subsequently providing the first magnetic means (21) or by partially replacing conventional components with components according to the invention.

The punching tool (1) according to the invention can be used and modified independently of the shape of the opening to be punched. In particular, it can be used for all round, square and/or special-shaped tool contours.

In a preferred first embodiment, the die (17) is held on the spacer sleeve (15) by second magnetic means (23). The second magnetic means (23) are designed essentially like the first magnetic means (21).

This ensures that the matrix (17) cannot accidentally fall down due to improper handling.

In a preferred second embodiment, which is an alternative to the first embodiment, the matrix (17) is held on the spacer bushing (15) by mechanical means. These mechanical means can be formed, for example, from screw connections or bayonet locks.

This also ensures that the matrix (17) cannot accidentally fall down due to improper handling.

In this preferred second embodiment, which is an alternative to the first embodiment, the spacer bushing (15) preferably has an extended passage (153) which, on the one hand, carries the mechanical means for holding the die (17). On the other hand, the extended passage (153) also ensures that the fastening means (13b) is guided more evenly and stably.

A development of the present invention provides that the first magnetic means (21) are arranged in the end face (111) or on the lateral surface of the cylinder (11). According to the invention, both arrangements are equivalent, and the selection can depend on the size of the punching tool or on the materials used. This development increases the variability of the present invention.

In order to reduce the magnetic force applied and to simplify the removal of the components from the assembly, clearances (157) can be provided in the end surface (155) of the spacer sleeve (15) facing the cylinder (11), i.e. in the component side opposite the magnetic field . The components can then be easily removed from one another, for example by simply rotating them.

Another development of the present invention provides that the second magnetic means (23) in the end face (159) or on the lateral surface of Spacer bushing (15) are arranged. According to the invention, both arrangements are equivalent, and the selection can depend on the size of the punching tool or on the materials used. This development increases the variability of the present invention.

In order to reduce the magnetic force applied and to simplify the removal of the components from the assembly, clearances can be provided in the end surface (175) of the die (17) facing the spacer bushing (15), i.e. in the component side opposite the magnetic field. The components can then be easily removed from one another, for example by simply rotating them.

In a simple embodiment, the adapter (13a) and fastening means (13b) can be permanently connected to one another.

A special development of the punching tool (1) according to the invention provides that the adapter (13a) and fastening means (13b) are designed in two parts and the fastening means (13b) has at least one projection (13b1) which, in the assembled state, is inside the cavity (171) of the Die (17) is arranged.

For this special development, the individual fasteners (13b) are first guided through the die (17) during assembly of the punching tool (1) according to the invention until the projection (13b1) rests within the cavity (171). The fastener (13b) that is guided through the die (17) is then guided through the optionally available spacer sleeve (15) before it is connected to the adapter (13a). Finally, the adapter (13a) is anchored in the cylinder (11).

This special further development has the advantage that a waste piece located in the cavity (171) after the punching process can be easily ejected through the projection (13b1).

In a particularly preferred embodiment, the fastening means (13b) is a screw.

The problem of punching waste described above is solved according to the invention in another development in that due to the first magnetic means (21) and / or the second magnetic means (23) from the material to be punched punched-out waste piece of the die can be ejected. In particular, if the magnetic force is sufficient, the waste piece can be pushed out of the die.

Fig. 1

eine schematische Explosionsdarstellung eines erfindungsgemäßen Stanzwerkzeugs 1 gemäß einer ersten Ausführungsform und

Fig. 2

eine schematische Explosionsdarstellung eines erfindungsgemäßen Stanzwerkzeugs 1 gemäß einer zweiten Ausführungsform.

Further goals, features, advantages and application possibilities result from the following description of exemplary embodiments that do not limit the invention, also with reference to the figures. All of the features described and/or illustrated form the subject matter of the invention, either alone or in any combination, even independently of their summary in the claims or their back-reference. Show it:

1

a schematic exploded view of a punching tool 1 according to the invention according to a first embodiment and

2

a schematic exploded view of a punching tool 1 according to the invention according to a second embodiment.

In the figures, all identical components are denoted by the same reference numbers, but for the sake of clarity, not all reference numbers are necessarily included in all illustrations.

The punching tool 1 according to the invention is one of the mobile hydraulic/pneumatic tools that occur in a variety of configurations in the prior art. A drive piston, which can be adjusted hydraulically or pneumatically in a housing of the punching tool 1 between an initial position and an end position and slides in the cylinder 11, serves to actuate a tool unit connected to this drive piston. In the case of the embodiments shown here, the tool unit is the adapter 13a with attachment means 13b attached thereto, which in turn carry the die 17 and punch 19 for the actual punching process.

figure 1 shows the punching tool 1 according to the invention according to a first embodiment in a schematic, partially cut-away exploded view. In the cylinder 11, the adapter 13a is used, which is connected to the drive piston, not shown here. In the adapter 13a, the fastening means 13b is accommodated in a non-positive manner, for example screwed. In this embodiment, the adapter 13a and the fastening means 13b are designed as one component and are permanently connected to one another.

The end of the fastener 13b facing away from the cylinder 11 is pushed through the passage 153 of the spacer sleeve 15 until the adapter 13a rests in the receiving opening 151. According to the invention, the spacer sleeve 15 is held on the cylinder by the first magnetic means 21 . In the illustrated embodiment, permanent magnets (e.g. neodymium magnets) are embedded in the end face 111 of the cylinder 11 as the first magnetic means 21 .

These permanent magnets can be embedded flush with the end face 111 for maximum magnetic force. Alternatively, the permanent magnets can be located somewhat lower than the end face 111, so that the magnetic force on the spacer bushing 15 to be held is reduced. In this way, depending on the size and weight of the spacer bushing 15 and the other components to be attached, different magnetic forces can be realized.

The die 17 is now pushed over the free end of the fastening means 13b, so that the fastening means 13b extends through its passage 173 and the cavity 171. In this embodiment, the matrix 17 is connected to the first magnetic means 21 via the second magnetic means 23 .

The punching tool 1 according to the invention, assembled in this way for the most part, can now be brought up to the material to be punched and positioned as a non-positively connected assembly group without one of the components being able to fall off.

For the punching process, the outer end of the fastener 13b, which is still free, is guided through a pre-drilled hole in the material to be punched and the punch 19 is attached to the fastener 13b from the opposite side, for example by screwing it tight.

By actuating the punching tool, the punch 19 is now pulled through the material to be punched into the cavity 171 and punches out the desired opening.

figure 2 shows the punching tool 1 according to the invention according to a second embodiment alternative to the first embodiment in a schematic, partially sectioned exploded view. figure 2 is largely identical to figure 1 , so that the basic structure need not be described again.

The important difference here is that the adapter 13a and the fastening means 13b are designed in two parts. In addition, the fastening means 13b has at least one projection 13b1, which is arranged inside the cavity 171 of the die 17 in the assembled state.

After the punching process, the punched off scrap of the punched material is in the cavity 171 of the die 17 where it may get stuck depending on the type of material, its thickness and other factors. In order to remove the waste piece from the die of a conventional stamping tool, additional tools or auxiliary devices may have to be used, which can be quite time-consuming.

Due to the special development of the present invention, however, the waste piece can be reached very easily by pushing the fastening means 13b, with the projection 13b1 engaging behind the waste piece and pushing it out of the die 17.

In the representation of figure 2 In addition, the matrix 17 is held on the spacer sleeve 15 not by second magnetic means 23 but by mechanical means. These mechanical means can consist, for example, of a screw connection or a bayonet catch. The advantages of the preferably provided extended leadthrough 153 have already been discussed above.

However, such a connection by mechanical means is not mandatory for the illustrated embodiment. Thus, in the second embodiment as well, the die 17 can be held on the spacer sleeve 15 by second magnetic means 23 .

Reference sign

1

stamping tool

11

cylinder

111

face of the cylinder

13a

adapter

13b

fasteners

13b1

cantilever

15

spacer bush

151

intake opening

153

passage of the spacer bush

155

End face of the spacer bush

157

frankings

159

Face of the spacer bush

17

die

171

cavity

173

implementation of the matrix

175

end face of the die

19

Rubber stamp

21

first magnetic means

23

second magnetic means

Claims (10)

Stamping tool (1) for mobile use, comprising - a cylinder (11), - an adapter (13a) with fastening means (13b) attached thereto, wherein the adapter (13a) can be inserted at least partially into the cylinder (11) at its first end, - optionally a spacer bushing (15) which has a receiving opening (151) for the adapter (13a) and a passage (153) for the fastening means (13b), - a matrix (17) which has a passage (173) for the fastening means (13b) and a cavity (171), and - a stamp (19) which can be connected to the fastening means (13b), characterized in that optionally the spacer sleeve (15) or the die (17) is held on the cylinder (11) by first magnetic means (21). Stamping tool (1) according to Claim 1, in which the die (17) is held on the spacer bushing (15) by second magnetic means (23). Stamping tool (1) according to Claim 1, in which the die (17) is held on the spacer bushing (15) by mechanical means. Punching tool (1) according to one of Claims 1 to 3, the first magnetic means (21) being arranged in the end face (111) or on the lateral surface of the cylinder (11). Stamping tool (1) according to Claim 4, in which clearances (157) are provided in the end surface (155) of the spacer sleeve (15) which faces the cylinder (11). Punching tool (1) according to one of Claims 1, 2, 4 and 5, the second magnetic means (23) being arranged in the end face (159) or on the outer surface of the spacer sleeve (15). Stamping tool (1) according to Claim 6, in which clearances are provided in the end surface (175) of the die (17) which faces the spacer bushing (15). Punching tool (1) according to one of Claims 1 to 7, in which the adapter (13a) and fastening means (13b) are designed in two parts and the fastening means (13b) has at least one projection (13b1) which, in the assembled state, is inside the cavity (171) of the Die (17) is arranged. Stamping tool (1) according to one of Claims 1 to 8, in which the fastening means (13b) is a screw. Punching tool (1) according to one of Claims 1 to 9, a waste piece of the die punched out of the material to be punched being able to be ejected on account of the first magnetic means (21) and/or the second magnetic means (23).

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