DE-102013111607-B4 - Tool for machining workpieces, especially sheet metal

DE102013111607B4DE 102013111607 B4DE102013111607 B4DE 102013111607B4DE-102013111607-B4

Abstract

A tool for machining workpieces (12), in particular sheet metal, comprising an upper tool (21) which receives a machining tool (62) and a lower tool (22) which receives a counter-holder (45), wherein the upper tool (21) and the lower tool (22) can be arranged opposite each other, so that the counter-holder (45) is positioned on one side and the machining tool (62) on the other side of the workpiece (12) which can be arranged between them, and the counter-holder (45) is designed as a rollable body and has at least one outer edge zone (55) which has a lower surface hardness than the workpiece (12) to be machined or the workpiece surface of the workpiece (12) to be machined, characterized in that, in the case of a workpiece (12) to be machined with a Vickers hardness in the range of 200 to 10,000 MPa, at least the outer edge zone (55) of the rollable body is made of a material with a Vickers hardness of less than trained to 200 MPa.

Inventors

Markus Wilhelm
Martin Decker
Alexander Heinz

Assignees

TRUMPF Werkzeugmaschinen SE + Co. KG

Dates

Publication Date: 20260513
Application Date: 20131022
Priority Date: 20121222

Claims (12)

A tool for machining workpieces (12), in particular sheet metal, comprising an upper tool (21) which receives a machining tool (62) and a lower tool (22) which receives a counter-holder (45), wherein the upper tool (21) and the lower tool (22) can be arranged opposite each other, so that the counter-holder (45) is positioned on one side and the machining tool (62) on the other side of the workpiece (12) which can be arranged between them, and the counter-holder (45) is designed as a rollable body and has at least one outer edge zone (55) which has a lower surface hardness than the workpiece (12) to be machined or the workpiece surface of the workpiece (12) to be machined, characterized in that, in the case of a workpiece (12) to be machined with a Vickers hardness in the range of 200 to 10,000 MPa, at least the outer edge zone (55) of the rollable body is made of a material with a Vickers hardness of less than trained to 200 MPa.
Tool after Claim 1 , characterized in that the outer edge zone (55) of the rollable body is designed as a coating or sheathing which is applied to an inner core (54).
Tool after Claim 1 , characterized in that the outer edge zone (55) extends over the entire cross-section of the rollable body and the rollable body is made of a solid material.
Tool according to one of the preceding claims, characterized in that the at least outer edge zone (55) of the rollable body is made of a thermoset, a thermoplastic, a thermoplastic elastomer, an elastomer, a synthetic fiber material, a non-ferrous metal, or an elastic natural product.
Tool after Claim 1 , characterized in that a paint or lacquer coating is applied to the outer edge zone (55) of the rollable body.
Tool after Claim 1 , characterized in that the outer edge zone (55) of the rollable body consists of two or more layers with different material properties, wherein the outer layer has a higher surface hardness than the inner layer.
Tool according to one of the preceding claims, characterized in that the counterholder (45) is arranged in a receptacle (43) of the lower tool (22), which is open towards the workpiece (12) and a holding device (47) is provided for positioning the counterholder (45) in the receptacle (43), by which the counterholder (45) is flexibly received along a longitudinal axis (50) of the lower tool (22).
Tool after Claim 7 , characterized in that the holding device (47) is designed as a spring element which has a receiving section (73) for a counter-holder receiving (46) and at least one fastening section (74) for fixing to or in the receiving (43) and includes strip-shaped expansion sections (75) in between.
Tool after Claim 7 or 8 , characterized in that , in the event of an overload of the lower tool (22), the counterholder (45) fully immerses itself in the receptacle (43) opposite an outer edge (52) of the receptacle (43) and the expansion sections (75) of the holding device (47) are plastically deformable.
Tool after Claim 1 , characterized in that the processing tool (62) is designed as a marking, embossing, foil cutting, engraving, roller deburring or roll forming tool.
Tool after Claim 1 , characterized in that , in the case of a workpiece (12) to be machined with a Vickers hardness in a range of 200 to 10,000 MPa, at least the outer edge zone of the rollable body in a range of 200 to 1,000 MPa is formed from plastic with a Vickers hardness of less than 200 MPa.
Tool after Claim 1 , characterized in that the rollable body is designed as a sphere (48), a cylinder (50) or a torus.

Description

The invention relates to a tool for machining workpieces, in particular sheet metal, which has an upper tool with a machining tool and a lower tool with a counterholder, wherein the upper tool and the lower tool can be arranged opposite each other, so that the counterholder is positioned on one side and the machining tool on the other side of a workpiece that can be arranged in between. From the DE 690 10 505 T4 A device for producing blanks from corrugated cardboard, rigid fiberboard, or similar materials is known, through which waste sections from the die-cut blanks are removed. For this purpose, a first and a second roller are provided, each having a layer of elastically compressible or deformable material. A scraper pin is provided on one of the rollers, which acts on the waste piece so that it is clamped by the opposite roller and transported away for disposal. From the EP 2 125 262 B1 A process for producing a structured material web with a multidimensional structure is known. A perforated sheet is fed to a pressure roller, which forms a gap with a support element roller through which the sheet is guided. This support element roller has hexagonal support elements consisting of recesses. The elastic pressure roller has such hardness that the sheet, passed between the pressure roller and the support element roller, is pressed into the recesses of the support elements. From the EP 2 450 120 A1 A burr removal machine is known which includes a tool for this purpose. This tool consists of an upper tool with a machining tool, such as a striking pin, and a lower tool which accommodates a counter-holder. The counter-holder is designed as a spring-loaded steel ball. During machining of the workpiece, the steel ball rests against one side of a cut edge of the workpiece. On the opposite side of the cut edge, a striking pin is used to remove the burr, with the ball counteracting the working force of the striking pin. US Patent 2006/0042341A1 describes a deburring tool in which an upper tool with a machining tool is located on one side of the workpiece to be processed, and a lower tool with a counter-holder is located on the opposite side. For deburring the workpiece, it is proposed that both the machining tool and the lower tool be designed as spheres made of steel, in order to smooth out the burr through a contact force during a traversing movement. US patent 2007/0122224A1 describes another tool for machining workpieces, especially sheet metal. An upper tool accommodates a marking tool as the machining tool. Opposite this, the lower tool includes a ball as a counter-holder. To machine the workpieces with the aforementioned tools, they are moved between the upper and lower tools, with the upper and lower tools positioned against the workpiece. This ensures that the ball rests against one side of the workpiece, while the machining tool engages the workpiece on the opposite side, applying pressure against the opposing ball. This process can cause scratches, marks, or indentations on the surface of the workpiece on the side facing the ball, which can impair the workpiece's quality. The invention is based on the objective of proposing a tool for machining workpieces, in particular sheet metal, in which damage to the workpiece surface of the workpiece to be machined, on which a counter-holder of the tool engages, is avoided. This problem is solved by a tool with the features of claim 1, comprising a counterholder designed as a rollable body, which has at least an outer edge zone with a lower surface hardness than the workpiece or workpiece surface to be machined. For a workpiece with a Vickers hardness in the range of 200 to 10,000 MPa, at least the outer edge zone of the rollable body on the counterholder is designed with a Vickers hardness of less than 200 MPa. This makes the rollable counterholder softer than the workpiece or workpiece surface to be machined, so that despite the contact force between the upper and lower tools, neither indentations nor scratches occur on the workpiece surface. This improves the machining quality of such workpieces. According to a preferred embodiment of the invention, the outer edge zone of the rollable body is designed as a coating which The coating is applied to a core. This allows for the simple production of such a counterholder. Furthermore, this coating can also be used as a wear indicator. As soon as this coating shows damage, flaking, or perforations, wear of the counterholder can be detected and it can be replaced. Alternatively, the outer edge zone can also be formed by a cladding applied to the inner core. Such a cladding is usually significantly thicker than a coating. This also allows for a wider selection of materials that can form such a cladding. This, in turn, enables the use of various manufacturing processes. For example, the cladding can be produced by vulcanization as well as by other polymerization processes. Like a coating, such a cladding can act as a wear in