DE2326984C3 - Device for the continuous production of nail-like head wires - Google Patents

Description

40

The invention relates to a device for the continuous production of nail-like head wires with a fixed and a movable pair of clamping jaws in the direction of the wire, one of which is used as a Upsetting die is used for upsetting the head.

In the known devices of this type, the wire is taken from a supply roll in the desired length pulled off by pliers, clamping jaws, ball clamps or by free-wheeling transport rollers and pushed into a die from behind, steadily or in stages, so far that it becomes a head The piece of wire to be deformed protrudes from the compression side of the die and from it during compression is clamped. The protruding piece of wire is then pulled through a crank or curve controlled molding tool in one operation or in several operations within one cycle for Deformed head. The finished head wire is behind the Die cut to the desired length and falls out of the divided die. The wire feed then pushes a new wire from the supply into the die.

It is also known to cut the wire to length in front of the die. Here the feed has to be be finished before cutting. The wire length protruding from the die for deformation can be carried out through a stop should be determined.

The limit of the use of the above devices is set by the wire diameter and the buckling resistance and the buckling length of the wire.

The invention is based on the object of a device of the type mentioned at the beginning, with which nail-like head wires made of copper, silver, Bronze and other metals can be produced significantly below a diameter of ViO mm, such as you need them in electronics.

According to the invention, this object is achieved by that the pair of clamping jaws forming the upsetting die relative to the other pair of clamping jaws in The longitudinal direction of the wire is movable back and forth and that by the movable pair of clamping jaws when removing from the fixed pair of jaws using the molded wire head as a stop for the Further or final shaping of the head required or required for the desired piece of head wire Wire length is peelable from the supply roll.

With this design, extremely thin wires can be processed into nail-like head wires, because kink resistance and kink length of the wires no longer play a role.

In an embodiment of the invention it is provided that the wire stub protruding from the upsetting die with adjacent pairs of clamping jaws can be formed into a head attachment on which the leading, closed compression die, the further drawing length that may be required for the head formation or the wire length required for the head wire is withdrawn from the supply roll so that the upsetting die is then removed open goes back, whereupon the now protruding from the closed upsetting die Wire stub with molded head is further deformed or cut off.

The path that the moving die covers can be transversely to the movement device with great accuracy inserted wedges are created, which are controlled via curves.

The drawing shows schematically the work flow of a device according to the invention.

In this drawing, 2a, 2b are clamping jaws which are fixedly arranged on the machine frame and which can be opened or closed in order to clamp the wire 4. 3a and 3b are a second pair of clamping jaws which, in contrast to the clamping jaws 2a, 2b , can be displaced in the direction of the wire. They form the upsetting die 3.

In Fig. 1, the wire 4 removed from the supply roll 5 passes through the pair of clamping jaws 2a, Ib and the die 3, which are both closed and pushed together. A wire stub 7 protrudes from the die 3.

In Fig. 2, the molding tool 6 is pressed against the stub 7 and has shaped it into a head extension 7a.

In Fig. 3 the pair of jaws 2a, 2b is open and the closed die 3 is moved to the right. She has pulled a piece of wire from the supply roll 5 by means of the head attachment 7a as a stop, the length of which is given by the distance A of the two pairs of clamping jaws.

In Figure 4, the die 3 is open and pushed up to the closed pair of jaws 2a, 2b . As a result, a piece of wire of length A with the head attachment 7a protrudes from the die 3.

After the die 3 is closed, the molding tool 6 compresses the head extension 7a larger towards the head

Tb, as in Fig. 5 shows. This procedure can be repeated several times to enlarge the head.

In Fig. 6, the die 3 is closed and has moved away from the opened pair of clamping jaws 2 by the distance R , pulling a piece of wire of length S from the supply roll 5.

This piece of wire protrudes to the right out of the die 3 when the pair of clamping jaws 3a, 36 open back to the left and rests against the closed pair of clamping jaws 2a, 2b (FIG. 7).

The protruding piece of wire of length B is separated from the knife Sa on the counter knife Sb except for a stub 7 and falls down as a finished head wire 9 (FIG. 8). The device is now back in the position shown in FIG. 1 position shown.

The counter knife 8f> (Figs. 7 and 8) is in the longitudinal direction of the device and serves as a stop for determining the length of the wire stub 7.

1 sheet of drawings

Claims (3)

Patent claims: 1. Device for the continuous production of nail-like head wires with a fixed and a pair of clamping jaws movable in the direction of the wire, one of which is used as an upsetting die for head upsetting, characterized in that the pair of clamping jaws (3 a, 36) forming the upsetting die (3) relative to the other pair of jaws ( 2a, 2b) is movable back and forth in the longitudinal direction of the wire and that by the movable pair of jaws (3a, 3b) when removing from the fixed pair of jaws (2a, 2b) using the molded wire head (7a, 7b) as a stop one for the next or . Eiidformung the head (7d, 7b) required or a wire length (A; B) required for the desired head wire piece (9) can be removed from the supply coil (5). 2. Apparatus according to claim 1, characterized in that the upsetting die (3) through transversely to Direction of movement is displaceable via curves adjusted wedges. 3. Apparatus according to claim 1 or 2, characterized in that the from the upsetting die (3) as protruding wire stub (7) with mutually adjacent pairs of clamping jaws (2a, 2b; 3a, 3b) to a head attachment (7a) can be formed on which the leading, closed upsetting die (3) removes the wire length (A) or the wire length (B) required for the head wire required for the head formation from the supply roll (5), so that the upsetting die (3) then returns open, whereupon the now from the re-closed upsetting die (3) protruding wire stub with molded head (7a, 7b) is further deformed or cut off.