PUNCHING GUN SET

Abstract

The present invention relates to a stapling tool (1) for mobile use; the said stapling tool comprises a cylinder (11), an adapter (13a) to which a fixing tool (13b) is attached, where the first end of the adapter (13a) can be placed at least partially into the cylinder (11), a spacer bushing (15) optionally having a slot opening (151) for the adapter (13a) and a through opening (153) for the fixing tool (13b), a matrix (17) having a through opening (173) and a gap (171) for the fixing tool (13b), and a staple (19) which can be connected with the fixing tool (13b); it is characterized by the optional holding of the spacer bushing (15) or the matrix (17) on the cylinder (11) by means of the first magnetic tools (21).

Description

[0001] The invention relates to a stamping tool for mobile use which has improved handling compared to conventional stamping tools.

[0002] It is known from prior art punches, such as those used in sheet metal processing, that during the processing process the material to be processed, in particular sheet metal, is pressed by a mechanical force from a punch into a corresponding die which is arranged behind the material to be punched.

[0003] However, these well-known punches have a number of disadvantages, such as the large amount of space required when used as stationary sheet metal processing machines, which increases with the greater the tool reach (maximum machinable edge distance). In contrast, mobile punches often have a relatively shallow jaw depth, thus limiting material processing, especially sheet metal processing, to the edge region of the material.

[0004] Hydraulic or pneumatic punch presses designed for mobile use are intended to remedy this problem. In mobile punch presses, the punch is connected to the hydraulic cylinder by a screw or bolt, and the material to be punched must already have a pre-drilled hole through which the screw or bolt is inserted. The punch is thus drawn directly into the die. The necessity of the pre-drilled hole is often cited as a disadvantage.

[0005] Such generic stamping tools are known from the prior art. For example, EP 3 025 824 B1 describes a mobile hydraulic tool with a drive piston that is hydraulically adjustable between a starting position and an end position, a hydraulic tool housing having a cylinder section that guides the drive piston, and a drawing or pressing tool unit that can be detachably connected to the drive piston and the hydraulic tool housing.

[0006] US 2012 / 255184 A1, which forms the basis for the preamble of claim 1, US 4 793 063 A, and US 5 327 631 A, all disclose a stamping tool with magnetic holding devices.

[0007] For stamping, it is necessary to position an assembly consisting of a cylinder, adapter with fastener, spacer, and die against the material to be stamped and guide it through an existing hole using the fastener. Then, on the opposite side of the material, the punch is connected to the fastener. Especially during positioning and guiding the assembly, careless handling during this process can cause parts of the assembly, particularly the spacer and die, to fall off. This not only interrupts the process but can also damage the material being stamped and the individual components.

[0008] Therefore, there is a need for a cost-effective and efficient solution to the aforementioned technical problems encountered in practice.

[0009] The present invention is therefore based on the objective of providing an improved stamping tool for mobile use, in which no parts of an assembly can fall off, even in the case of careless operation.

[0010] This problem is solved in the present invention by a stamping tool (1) according to claim 1.

[0011] According to the invention, the cylinder (11) is a hydraulic or pneumatic cylinder designed to draw the punch (19) into the die (17) by means of an adapter (13a) and a fastening means (13b) attached thereto.

[0012] According to the invention, the adapter (13a) serves to establish a connection between the fastening means (13b) and the cylinder (11).

[0013] The fastening means (13b) is anchored on one side in the adapter (13a), on its side opposite the cylinder (11) it has a device for force-fit connection of the punch (19).

[0014] According to the invention, the spacer bushing (15) compensates for height differences in order to optimize the positioning of the punch (19) and, if necessary, to compensate for the difference of a stepped fastening element (13b).

[0015] The "first magnetic means" (21) are 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.

[0016] 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 must be incorporated opposite the magnet(s) in the components.

[0017] The present invention has the initial advantage that the spacer sleeve (15) is held in a simple manner on the cylinder (11) by the first magnetic means (21), the spacer sleeve (15) in turn holding the assembly consisting of the adapter (13a) with the fastening means (13b) attached thereto. Thus, none of these components can unintentionally fall off the stamping tool according to the invention. Furthermore, it is possible to retrofit 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.

[0018] 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, angular and / or special-shaped tool contours.

[0019] According to the invention, the die (17) is held on the spacer sleeve (15) by second magnetic means (23). The second magnetic means (23) are essentially designed like the first magnetic means (21).

[0020] This ensures that the die (17) cannot fall unintentionally due to improper handling.

[0021] In a preferred second embodiment, which is an alternative to the first embodiment and is not covered by the claims, the die (17) is held on the spacer bushing (15) by mechanical means.

[0022] These mechanical means can be formed, for example, from screw connections or bayonet fittings.

[0023] This also ensures that the die (17) cannot fall unintentionally due to improper handling.

[0024] 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 a more uniform and stable guidance of the fastening element (13b).

[0025] According to the invention, the first magnetic means (21) are arranged in the end face (111) or on the lateral surface of the cylinder (11). Both arrangements are equivalent according to the invention, the choice depending on the size of the stamping tool or the materials used. This further development increases the variability of the present invention.

[0026] To reduce the applied magnetic force and simplify the removal of the components from the assembly, recesses (157) can be provided in the end surface (155) of the spacer sleeve (15) facing the cylinder (11), i.e., in the side of the component opposite the magnetic field. The components can then be easily removed from each other, for example, by simply rotating them.

[0027] According to the invention, the second magnetic means (23) are arranged in the end face (159) or on the outer surface of the spacer bushing (15). Both arrangements are equivalent according to the invention, the choice depending on the size of the stamping tool or the materials used. This further development increases the variability of the present invention.

[0028] To reduce the applied magnetic force and simplify the removal of the components from the assembly, recesses can be provided in the end face (175) of the die (17) facing the spacer bushing (15), i.e., in the side of the component opposite the magnetic field. The components can then be easily removed from each other, for example, by simply rotating them.

[0029] In a simple embodiment, the adapter (13a) and the fastening means (13b) can be permanently connected to each other.

[0030] A special embodiment of the stamping tool (1) according to the invention provides that the adapter (13a) and fastening means (13b) are designed in two parts and that 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.

[0031] For this specific further development, during the assembly of the stamping tool (1) according to the invention, the individual fastening element (13b) is first guided through the die (17) until the projection (13b1) rests within the cavity (171). Subsequently, the fastening element (13b) guided through the die (17) is guided through the existing spacer sleeve (15) before being connected to the adapter (13a). Finally, the adapter (13a) is anchored in the cylinder (11).

[0032] This special further development has the advantage that, due to the projection (13b1), a waste piece located in the cavity (171) after the punching process can be easily ejected.

[0033] In a particularly preferred embodiment, the fastening means (13b) is a screw.

[0034] The problem of stamping waste described above is solved in another embodiment of the invention by the fact that, due to the first magnetic means (21) and / or the second magnetic means (23), a waste piece punched out of the die can be ejected. In particular, with sufficient magnetic force, the waste piece can be pushed out of the die.

[0035] Further objectives, features, advantages, and applications will become apparent from the following description of exemplary embodiments that do not limit the invention, also with reference to the figures. The figures show: Fig. 1 is a schematic exploded view of a stamping tool 1 according to a first embodiment according to the invention, and Fig. 2 is a schematic exploded view of a stamping tool 1 according to a second embodiment according to the invention.

[0036] In the figures, all identical components are named with the same reference symbols; however, for the sake of clarity, not all reference symbols are necessarily included in all representations.

[0037] The stamping tool 1 according to the invention belongs to the category of mobile hydraulic / pneumatic tools, which exist in various configurations in the prior art. A drive piston, hydraulically or pneumatically adjustable between a starting position and an end position within a housing of the stamping tool 1 and sliding in the cylinder 11, serves to actuate a tool unit connected to this drive piston. In the embodiments shown here, the tool unit is the adapter 13a with a fastening element 13b attached to it, which in turn carries the die 17 and punch 19 for the actual stamping process.

[0038] Figure 1Figure 1 shows the stamping tool 1 according to a first embodiment in a schematic, partially cut-away exploded view. The adapter 13a, which is connected to the drive piston (not shown), is inserted into the cylinder 11. The fastening element 13b is positively engaged in the adapter 13a, for example by screwing it in place. In this embodiment, the adapter 13a and the fastening element 13b are designed as a single component and are permanently and firmly connected to each other.

[0039] The fastening element 13b is pushed through the opening 153 of the spacer sleeve 15 with its end facing away from the cylinder 11 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.

[0040] These permanent magnets can be flush with the end face 111 for maximum magnetic force. Alternatively, the permanent magnets can be positioned slightly deeper than the end face 111, thus reducing the magnetic force on the spacer sleeve 15 to be held. In this way, different magnetic forces can be achieved depending on the size and weight of the spacer sleeve 15 and the other components to be attached.

[0041] The die 17 is now pushed over the free end of the fastening element 13b, so that the fastening element 13b extends through its opening 173 and the cavity 171. In this embodiment, the die 17 is connected to the first magnetic element 21 via second magnetic means 23.

[0042] The stamping tool 1 according to the invention, which is largely assembled in this way, can now be brought to the material to be stamped and positioned as a force-fit connected assembly without any of the components being able to fall off.

[0043] For the punching process, the still free outer end of the fastening element 13b is now guided through a pre-drilled hole in the material to be punched and the punch 19 is attached to the fastening element 13b from the opposite side, for example by screwing it on.

[0044] By actuating the punching tool, the punch 19 is now drawn through the material to be punched into the cavity 171 and punches out the desired opening.

[0045] Figure 2 Figure 1 shows the stamping tool 1 according to a second embodiment alternative to the first embodiment in a schematic, partially cut-away exploded view. Figure 2 is largely identical to Figure 1 , so that the basic structure does not need to be described again.

[0046] An important difference here is that adapter 13a and fastener 13b are designed in two parts. Furthermore, fastener 13b has at least one projection 13b1, which, when assembled, is located within the cavity 171 of the die 17.

[0047] After the punching process, the extruded waste piece of the punched material is located in the cavity 171 of the die 17, where it can become stuck depending on the type of material, its thickness, and other factors. Removing the waste piece from the die of a conventional punching tool may require additional tools or auxiliary devices, which can be quite time-consuming.

[0048] However, by special further development of the present invention, the waste piece can be reached very easily by sliding the fastening means 13b, whereby the projection 13b1 engages behind the waste piece and pushes it out of the die 17.

[0049] In the presentation of the Figure 2Furthermore, the die 17 is not held on the spacer bushing 15 by second magnetic means 23, but by mechanical means, which is not covered by the claims. These mechanical means can, for example, consist of a screw connection or a bayonet fitting. The advantages of the preferably provided extended bushing 153 have already been discussed above.

[0050] However, such a connection by mechanical means is not mandatory for the illustrated embodiment. In the second embodiment, the die 17 can also be held on the spacer bushing 15 by second magnetic means 23. Reference sign

[0051] 1 Punching tool 11 Cylinder 111 Cylinder end face 13a Adapter 13b Fastener 13b1 Projection 15 Spacer bushing 151 Receiving opening 153 Spacer bushing passage 155 Spacer bushing end face 157 Clearances 159 Spacer bushing end face 17 Die 171 Cavity 173 Die passage 175 Die end face 19 Punch 21 First magnetic means 23 Second magnetic means

Claims

1. 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 introduced at least partially into the cylinder (11) at its first end, - a spacer bush (15) which has a receiving opening (151) for the adapter (13a) and a leadthrough (153) for the fastening means (13b), - a die (17) which has a leadthrough (173) for the fastening means (13b) and a cavity (171), and - a punch (19) which can be connected to the fastening means (13b), wherein the die (17) is held on a spacer bush (15) by second magnetic means (23) and wherein the second magnetic means (23) are arranged in the end face (159) or on the lateral surface of a spacer bush (15), characterized in that the spacer bush (15) is held on the cylinder (11) by first magnetic means (21), wherein the first magnetic means (21) are arranged in the end face (111) or on the lateral surface of the cylinder (11).

2. The punching tool (1) according to claim 1, wherein clearances (157) are provided in the end face (155) of the spacer bush (15) facing the cylinder (11).

3. The punching tool (1) according to claim 1, wherein clearances are provided in the end face (175) of the die (17) facing the spacer bush (15).

4. The punching tool (1) according to any one of claims 1 to 3, wherein the adapter (13a) and the fastening means (13b) are configured in two parts and the fastening means (13b) has at least one projection (13b1) which is arranged within the cavity (171) of the die (17) in the assembled state.

5. The punching tool (1) according to any one of claims 1 to 4, wherein the fastening means (13b) is a screw.

6. The punching tool (1) according to any one of claims 1 to 5, wherein a waste piece punched out of the material to be punched can be ejected from the die (17) due to the first magnetic means (21) and / or the second magnetic means (23).