Punching head, machining tool with one such punching head and machining device with one such punching head or machining tool

#The invention relates to a punching head. The invention furthermore relates to a machining tool and a machining device.

#In the sense of the invention a “machining tool” is especially a deep-drawing and/or punching and/or metal-forming tool for use in a press or similar machining devices. Machining tools of this type are known and are used in the production of workpieces in the form of components for motor vehicle bodies.

#Fundamentally these machining tools are also known with punching heads or devices which are located in the tool and which are used for attaching nuts or nut-like components. Nuts in the sense of the invention are especially punch nuts and/or rivet nuts and/or insert nuts. Nut-like components in the sense of the invention are nuts, but also these components with a polygonal or cylindrical body and especially also those in which the axial length of the component body is smaller than the maximum diameter of this body. Nut-like components in this sense are also sliding or guide bushings with bushing bodies made similarly to the bodies of punch or insert nuts, but with an opening without a thread.

#The invention is detailed below using the figures on embodiments.

#FIG. 1 shows in simplified form a component or fastener in the form of a nut together with a sheet metal workpiece;

#FIG. 2 shows the blank holder and the bottom part of the machining tool for use in a press, together with a punching head for processing the nuts of FIG. 1, in a section;

#In FIG. 1 the workpiece is of sheet metal, for example a punched or bent part of sheet steel. A fastener in the form of a nut 2 is anchored into the opening of the workpiece 1 by joining and subsequent pressing.

#A blank holder is labeled 3 and the lower part of a multipart tool 5 is labeled 4 and is for example a deep drawing and/or punching and/or metal-forming tool and is used for producing the workpiece 1 and at the same time also for joining and fixing the nut 2 which is made as an insert nut. The tool 5 has a punching head 6 which is attached to the blank holder 3 in this embodiment for inserting the nut into the workpiece 1.

#The punching head 6 includes a front head section or head piece 7 which is made in the embodiment shown in two parts consisting of parts 7′ and 7″, and of the cylindrical housing 8 which stands away over the top of the head piece 7. In the head piece 7 or in the lower part 7″ of this head piece a vertical joining channel 9 is formed which is open on the bottom of the head piece 7, in the area of an annular contact surface 9. In the joining channel 9 and in the extension which coaxially adjoins this joining channel to the top, there is a plunger 11 which can be moved by a given stroke (double arrow H) in the plunger axis AS, between an initial position in which the lower plunger end 12 is located above the loading channel 13 which is likewise made in the head piece 7 or in the part 7″ and which intersects the joining channel 9, and in which thus the loading channel 13 to the joining channel 9 or to the readiness position 9′ in the joining channel 9 is open underneath the plunger surface 12, and the position in which the plunger 11 blocks the loading channel 13 toward the joining channel 9 and the plunger end 12 is located in the vicinity of the lower opening of the joining channel 9 or the annular surface 10 there in the joining and press position. On the plunger end 12 in the embodiment shown there are two permanent magnets 14 which are located offset radially to the plunger axis AS and are offset by 180° against one another relative to this axis.