DE29818546U1 - Flat rolling jaw - Google Patents

Description

Description: Flat rolling die

It is known to produce the thread of screws by rolling a wire pin between two rolling dies. One rolling die is held in place while the other is moved in the longitudinal direction of the rolling dies. The steel pin is arranged between the two rolling dies and is rolled. During this rolling process, a thread is rolled into the wire pin. Since the thread is rolled into the initially smooth wire and then becomes increasingly thicker, there is greater wear at the inlet of the rolling dies.

The invention is based on the object of creating a rolling die for producing threaded elements or the like, which causes lower costs.

To solve this problem, the invention proposes a rolling mill with the features of claim 1. Further developments of the invention are the subject of the dependent claims, the wording of which, like the wording of the summary, is made part of the content of the description by reference.

The transverse division of the rolling die makes it possible, for example, to cut the part that is subject to greater wear from

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a higher quality and therefore more expensive material, while the remaining part can be made from a simpler and therefore cheaper material. Then the service life of the rolling die is determined by the material of the higher quality part, even though the entire rolling die is not made from the higher quality material.

Another possibility is that when wear occurs, only the worn part is replaced, while the rest of the part can continue to be used.

In a further development of the invention, it can be provided that the division is arranged between the inlet area and the outlet area.

For example, the inlet area can be about half as long as the outlet area, so that the division divides the rolling die approximately in a ratio of one to two.

In particular, to facilitate replacement, it can be provided that both parts of the flat rolling die can be detachably connected to one another.

According to the invention, it can be provided that both parts consist of different materials and/or are treated differently. For example, the inlet area can be hardened using a different hardening process.

In particular, it can be provided that the separation between the two parts is arranged along a plane running perpendicular to the longitudinal direction of the rolling die.

In order to align the two parts of the rolling die, it can be provided according to the invention that at least one cylindrical pin engages in two aligned bores of the two parts with a close fit.

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It may be provided to screw the two parts together by means of screws acting in the longitudinal direction of the jaws.

It is of course particularly advantageous if, in a pair of flat rolling dies, both rolling dies are designed as just described.

Further features, details and advantages of the invention emerge from the following description of a preferred embodiment of the invention and from the drawing. Here:

Fig. 1 is a plan view of the machining side of the first part of a flat rolling die according to the invention;

Fig. 2 is a plan view of the machining side of the second part;

Fig. 3 is a bottom view of the rolling die part of the figure in Fig. 1;

Fig. 4 is a right end view of the part in Fig. 1;

Fig. 5 is a perspective view of the two parts of the rolling die;

Fig. 6 schematically shows a front view of the two

Rolling dies at the beginning of machining a wire pin.

Fig. 1 and 2 show side by side in the correct alignment the two parts of a flat rolling die proposed by the invention for producing profiled pins, for example

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wise screws. The part 1 shown in Figure 1 forms the inlet area of the rolling die, while the part shown in Figure 2 forms the outlet area. The movement of a wire pin that is to be rolled into a screw is from left to right. This direction is the longitudinal direction of the rolling die. In the first area corresponding to Figure 1, there is usually greater wear on the processing surface, i.e. the visible surface. The profiling of the processing surfaces shown in Figures 1 and 2 is not shown for reasons of simplification. It is a group of slightly slanted grooves and elevations that are intended to form the thread.

At the parting surface 3 of the longer part of the rolling die, two cylindrical pins 4 protrude from it, which are fitted into corresponding holes in part 2 of the rolling die.

The separating surface 5 of the shorter part of the rolling die has corresponding cylindrical holes 6, the diameter of which is matched to the diameter of the pins 4 so that the shorter part 1 can be pushed onto the pins 4 with a tight fit until the two separating surfaces 3, 5 lie tightly against one another. The two parts can then be fastened by inserting screws through further holes 7 of the shorter part 1, which engage in threaded holes 8 of the longer part 2 and are screwed tight there.

Figure 5 shows a perspective view of the two parts L, 2, which are put together and then form the flat rolling die. To roll a thread onto a screw, two such rolling dies are required, which are arranged so that their machining surfaces face each other. This is shown schematically in Figure 6. In the lower rolling die in Figure 6, the shorter part 1,

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which contains the inlet area, is arranged on the left, while in the upper rolling jaw the shorter part 1 forming the inlet part is arranged on the right. Between the two rolling jaws there is a wire pin 9 which is to be rolled into a screw. From the starting position shown in Fig. 6, the upper rolling jaw moves to the right and/or the lower one to the left. The initially smooth pin 9 is first machined by the inlet area of both rolling jaws until it finally reaches the outlet area. As soon as the wear of the inlet areas has exceeded a certain amount in the production process, the parts 1 forming the inlet area can be replaced. In the example shown, the part 2 forming the outlet area is slightly more than twice as long as the inlet area. However, this is not an exact limit for the relationship between the two parts.

Since the two parts are very well guided together by the tight fit of the cylindrical pins 4, the smaller part 1 can contain a threaded hole 10 running in the longitudinal direction to facilitate replacement, into which a screw can be screwed. This then presses on the opposite separating surface 3 of the longer part 2 and in this way pushes the shorter part 1 away from the pins 4.

Claims (9)

1.3 a set of thread-forming projections and grooves, whereby 1.4 the jaw is divided transversely to its longitudinal extent. 2. Flat rolling die in which the division is arranged between the inlet area and the outlet area. 3. Flat rolling die according to claim 1 or 2, wherein the division divides the die approximately in a ratio of one to two. 4. Flat rolling die according to one of the preceding claims, in which both parts (1, 2) can be detachably connected to one another. 5. Flat rolling die according to one of the preceding claims, in which both parts (1, 2) consist of different materials and/or are treated differently. 6. Flat rolling die according to one of the preceding claims, A33 271 φφφ · _ in which the separation is arranged in a plane perpendicular to the longitudinal direction of the rolling die. 7. Flat rolling die according to one of the preceding claims, in which at least one cylindrical pin (4) is provided for aligning the two parts (1, 2), which engages in bores in the two parts (1, 2). 8. Flat rolling jaw according to one of the preceding claims, in which both parts (1, 2) are screwed together by screws acting in the longitudinal direction of the jaw. 9. A pair of flat rolling dies, in which both dies are designed according to one of the preceding claims.