JPS6110807Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms a dummy block by abutting an expandable dummy ring on the tip side of the dummy body.
This invention relates to a dummy block for a metal extrusion processing machine, which is intended to allow only the dummy ring that is most likely to wear out to be replaced at any time, and to further streamline the self-centering of the dummy block.

Conventionally, as a dummy block for extrusion processing machines, the gap between the hollow part of the stem and the dummy block mounting rod buffered the impact when the container had a narrow core. 54−
26351), the shock cannot be absorbed by the buffer alone,
There is a problem in that the rod threaded portion, dummy block threaded portion, and the edge receiving the pressing force are worn out and must be replaced or majorly repaired, resulting in a large amount of cost.

However, this idea creates a gap for alignment between the wall of the central mounting hole of the dummy body and the outer wall of the fixture, and allows the two to loosely fit, allowing automatic alignment when the center of the container is narrow. At the same time, the dummy block is separated into the dummy body and the dummy ring, and the dummy ring freely contacts the end face of the dummy body, making it possible to replace the dummy ring, which is the most likely to wear out, so the dummy block can be partially replaced. Thus, the above-mentioned conventional problems have been solved.

That is, an embodiment of this invention will be described based on the drawings.A fixture 4 is screwed and fixed to the tip of a rod 3 that is loosely inserted into the center of a hollow stem 2. Mounting tool 4
has a disk portion 4a at the base that should come into contact with the distal end surface 2a of the hollow stem 2, and the disk portion 4a has a cylindrical connecting portion 4.
A plurality of latching protrusions a, on the same circumference via b.
b, c, and d are arranged at equal intervals to form the hook portion 4c. The latching part 4c of the fixture 4 is inserted into the central hole 5a of the cylindrical dummy body 5, and the latching protrusions a, b, c, and d of the central hole 5a correspond to the latching protrusions a, b, c, and d. b, c, and d, and the pin 10 inserted into the pin hole 5b of the dummy body 5 is planted in the fixture 4 to control the rotation (circumferential direction) between the dummy body 5 and the fixture 4. is being prevented. The dummy body 5
The inside wall at the tip of the central hole 5a has a slightly smaller diameter and is provided with a step 5c.The head 8a of the bolt 8 is hooked to this step 5c, and the tip of the bolt 8 protrudes outside the dummy body to form a dummy boss 7. Screw and secure, and tighten bolt 8.
The top 8b of the head faces the distal end surface 4d of the fixture 4 with a gap maintained therebetween. The size of the gap is equal to or larger than the gap between the dummy boss and the dummy body. The outer wall of the dummy boss 7 has a truncated conical shape, with the small diameter end face facing the tip face of the dummy body with a gap, and the large diameter end face being a face that comes into contact with the billet end face, and the outer wall of the dummy boss 7 extends outward from the dummy boss 7. A dummy ring 6 having a conical hole 6a having a similar shape is loosely fitted therein. The dummy ring 6 has its small diameter end abutted against the front end surface of the dummy body 5, and its outer diameter is increased by press-fitting the dummy boss 7, so that the cylindrical portion 6b of the front end side wall of the dummy ring 6 contacts the inner wall of the container 1. It comes into close contact with the surface over a predetermined area, forming a surface contact portion. There is a gap 9 between the outer wall of the hooking part and the cylindrical connecting part 4b of the fixture 4 and the inner wall of the central hole 5a of the dummy body.
(for example, 2 mm forward and backward), so that when the container 1 becomes misaligned, the dummy body 5 can be automatically aligned via the dummy ring 6. In other words, the dummy block is aligned in the gap between the dummy boss, the dummy body, the center hole wall of the dummy body 5, and the outer wall of the fixture 4, and the impact caused by the misalignment of the container is absorbed and alleviated. There is no risk of wear and tear on the threaded portion between the rod 3 and the rod 3. In the above embodiment, the fitting was connected to the rod inside the hollow stem, but the fitting could also be connected to the stem. However, in this type of dummy block, the part that is most likely to wear out (the part where the dummy block and the container are in close contact) is the dummy ring 6 in this invention, so it is only necessary to replace the dummy ring 6, which is relatively inexpensive. It can be repaired. Furthermore, when the dummy block is constructed by combining the dummy body 5 and the dummy ring 6, rather than integrally, the dummy ring 6 deforms relatively easily when pressing the billet. There is an advantage that the container 1 and the dummy ring 6 can easily slide closely together. That is, according to this invention, the dummy block is composed of a dummy body and a dummy ring attached to the dummy body, and
The dummy body is connected to the stem end via a fitting,
Since the dummy ring is connected by the dummy boss and the bolt attached to the dummy main body, it is relatively easy to cope with misalignment of the container, and there is an effect that the connecting part is not excessively affected. In particular, the stem and dummy block are connected via a fixture, and the dummy block is loosely latched to the fixture so that it can be moved in the diametrical direction, so the misalignment between the container and the stem can also be absorbed by this latching part. This has the effect of preventing the stem tip from breaking. Further, since only the part of the dummy block that is most likely to wear out (the dummy ring part) can be replaced individually, there is an effect that repairs can be made at a relatively low cost.

[Brief explanation of the drawing]

Fig. 1 is a partially cut-away front view of an embodiment of this invention, Fig. 2 is a partially cut-away front view when pressing the billet, and Fig. 3 is the state in which the dummy body and the fixture are engaged. FIG. 1. Container, 2. Hollow stem, 3. Rod, 4. Mounting tool, 5. Dummy body, 6.
Dummy ring, 7...Dummy boss.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The proximal end of the dummy body is loosely fitted and latched to a fitting to be fixed to the stem end with a gap in the diametrical direction,
A dummy ring having a conical hole with a large diameter on the outside is brought into contact with the tip surface of the dummy body, and a gap is provided between the dummy boss and the dummy boss, which has a frusto-conical shape that fits into the conical hole, and A dummy block for a metal extrusion processing machine, consisting of a dummy boss and a dummy body that are movably attached in the direction of the center line. 2. A dummy block for a metal extrusion processing machine according to claim 1, wherein the maximum outer diameter of the dummy boss is larger than the maximum inner diameter of the conical hole of the dummy ring. 3. To loosely fit and lock the fixture and the dummy body, insert the hooking part of the fixture into the center hole of the dummy body, and then hook the hooking protrusion of the center hole and the hooking protrusion of the fixture to each other. A dummy block for a metal extrusion processing machine according to claim 1, which has been registered as a utility model.