JP3598465B2 - Die type - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a die used for extrusion molding in plastic working.
[0002]
[Prior art]
A metal extrusion device, which is a type of plastic working device, presses a container into contact with a die and makes the billet loaded in the container extruded into the die using a stem, thereby turning the billet into an extruded product of a predetermined shape. Things. After the billet is extruded, the container is slightly retracted, the cutting device separates the product portion from the remaining billet (referred to as "discard") in the container, and after discharging the discard, A new billet is loaded.
[0003]
The die used in such a metal extruder is one that combines a die body and a reinforcing case and fits the die body into the reinforcing case.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional die, the die main body is integrated into the reinforcing case by high-pressure fitting into the reinforcing case. However, since the die main body has a uniform thickness over the entire circumference, the effect of the circumferential stress and the radial stress is exerted. Did not work effectively. Therefore, the service life of the mold is short, and improvement of this point has conventionally been desired.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a die having a longer service life.
[0006]
[Means for Solving the Problems]
Thus, the gist of the present invention is that the die includes a combination of a die body and a reinforcing case, and in a die type in which the die body is fitted into the reinforcing case, the reinforcing case is formed into a cylindrical shape with a bottom, and the bottom is formed. At the center position, a communication hole to the die hole with a diameter slightly larger than the communication hole to the die hole of the receiver will be provided, and at the inner bottom of the reinforcing case, the diameter at the center position is the same as or slightly larger than the die hole. The receiving body provided with the communication hole to the die hole having a diameter is loosely fitted, furthermore, the die body is inserted into the reinforcing ring with high pressure and the reinforcing ring is inserted into the reinforcing case with high pressure and assembled. A die is characterized in that a groove having a required depth along the axial direction of the die body is formed from a die hole side and / or an outer peripheral side at a location where concentrated stress is generated in the state.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a central longitudinal sectional view of a first embodiment of the present invention, and FIG. 2 is a plan view.
[0008]
In the figure, reference numeral 1 denotes a die body. Reference numeral 1a denotes a die hole, which has a hexagonal cross section in the present embodiment. In the present embodiment, the die body 1 is located at a location where a concentrated stress is generated under an internal pressure state (when the die hole 1a has a hexagonal axial cross section, each corner), from the outer peripheral side, the die The groove 2 has a required depth along the axial direction of the main body.
[0009]
Reference numeral 3 denotes a reinforcing case, which has a cylindrical shape with a bottom, and has a communication hole 4 for a die hole slightly larger than a communication hole for a die hole of a receiver, which will be described later. Further, a receiving member 5 having a communication hole 5a with a diameter equal to or slightly larger than the die hole 1a at the center position is dropped into the inner bottom 3a of the reinforcing case 3 and loosely fitted. ing.
[0010]
Reference numeral 6 denotes a reinforcing ring interposed between the die body 1 and the reinforcing case 3. When this is fitted into the reinforcing case 3, the die body 1 is fitted into the reinforcing ring 6 with high pressure, and furthermore, the reinforcing ring 6 is fitted with high pressure into the reinforcing case 3.
[0011]
In the present embodiment, the groove 2 having a required depth along the axial direction of the die body 1 is formed at a location where concentrated stress occurs in the internal pressure state of the die body 1. The muscle groove 2 has a reduced thickness and a reduced cross-sectional area. Then, the circumferential stress applied from the outer periphery by high pressure input from the outer periphery acts greatly. Further, the portion other than the groove 2 is thick, and the radial stress generated when an internal pressure is applied to the die body can be reduced. Therefore, the circumferential stress and the radial stress can be effectively applied, and the useful life of the mold can be improved.
[0012]
Further, in the present embodiment, the die body 1 can be separated from the reinforcing case 3, receives the reinforcing case 3, and has a die body pushing pin having a diameter larger than the communication hole 5 a to the die hole of the receiver 5. When the member 7 is inserted into the communication hole 4 to the die hole provided at the bottom of the reinforcing case 3 and pressurized, the die body 1 and the reinforcing ring 6 are extruded together. Incidentally, in the conventional die type, it was extremely difficult to separate the die body and the reinforcing case. Thereby, when a crack or other damage occurs in the die main body 1, the die main body 1 is removed and the damaged portion is repaired, and the damaged main body 1 is reused after the repair. It just needs to be replaced. Therefore, it is much more economical than the conventional one.
[0013]
Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described.
FIG. 3 is a central longitudinal sectional view, and FIG. 4 is a plan view.
[0014]
The difference between the present embodiment and the first embodiment is that the positions where the groove is formed are reversed. That is, in the present embodiment, the groove 2 is formed from the die hole 1a side. Since other configurations and operations are the same as those of the first embodiment, the same members are denoted by the same reference numerals and detailed description is omitted.
[0015]
Next, a third embodiment of the present invention shown in FIGS. 5 and 6 will be described.
FIG. 5 is a central longitudinal sectional view, and FIG. 6 is a plan view.
[0016]
The present embodiment is different from the first and second embodiments in that the muscle groove is formed from both sides. That is, in the present embodiment, the groove 2 is formed from both sides of the die hole 1a and the outer peripheral side of the die body 1. Since other configurations and operations are the same as those of the first embodiment and the second embodiment, the same members are denoted by the same reference numerals, and detailed description is omitted.
[0017]
FIGS. 7 to 9 show locations where concentrated stress is generated in the internal pressure state for each cross-sectional shape of the die hole. FIG. 7 shows a case where the groove 2 is formed from the outer peripheral side of the die body 1 and FIG. FIG. 9 shows a case where the groove 2 is formed from the die hole 1a side and FIG. 9 shows a case where the groove 2 is formed from both sides from the outer peripheral side of the die body 1 respectively.
[0018]
【The invention's effect】
According to the present invention, because of the above-described operation, in addition to the effect that the service life of the mold can be improved, the effect of enabling separation of the die main body and the reinforcing case can also be obtained. Thus, when a crack or other damage occurs in the die main body, the die main body is removed and the damaged portion is repaired, and the damaged main body is reused after the repair, or only the die main body is replaced when the life of the die main body comes to an end. It only needs to be done. Therefore, it is much more economical than the conventional one.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view of a first embodiment of the present invention.
FIG. 2 is a plan view of the first embodiment of the present invention.
FIG. 3 is a central longitudinal sectional view of a second embodiment of the present invention.
FIG. 4 is a plan view of a second embodiment of the present invention.
FIG. 5 is a central longitudinal sectional view of a third embodiment of the present invention.
FIG. 6 is a plan view of a third embodiment of the present invention.
FIG. 7 is an explanatory view of a location where a concentrated stress is generated in an internal pressure state for each cross-sectional shape of a die hole, and shows a case where a groove is formed from an outer peripheral side of a die main body.
FIG. 8 is an explanatory diagram of a location where a concentrated stress occurs in an internal pressure state for each cross-sectional shape of the die hole, and shows a case where a groove is formed from the die hole side.
FIG. 9 is an explanatory view of locations where concentrated stress is generated in an internal pressure state for each cross-sectional shape of a die hole, and shows a case where a groove is formed from both sides from the die hole side and the outer peripheral side of the die body. is there.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 die main body 1a dice hole 2 streak groove 3 reinforcing case 4 communication hole 5 to die hole 5 receiver 5a communication hole 6 to die hole 6 reinforcing ring

Claims (1)

In the die type consisting of a combination of a die body and a reinforcing case, the die case is fitted into the reinforcing case. In the die type, the reinforcing case has a cylindrical shape with a bottom. A receiver with a communication hole to a die hole with a diameter slightly larger than that of the die hole and a communication hole with a die hole with the same diameter as the die hole or a slightly larger diameter in the center at the inner bottom of the reinforcing case The die body is inserted into the reinforcing ring with high pressure, and the reinforcing ring is inserted into the reinforcing case with high pressure. A die having a groove formed at a required depth along the axial direction of the die body from the outside and / or the outer peripheral side.

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