JPH03207521A - Device for extrusion - Google Patents

Abstract

PURPOSE:To prevent the generation of defective shape for the extruded material to be formed by setting the heat insulating air layer in the arranging state to restrict the outgoing radiation from the dies to at least one component among the construction members for extruding tool of the dies, the backer and the die-ring, etc. CONSTITUTION:The annular groove 10 in the peripheral direction is formed at the intermediate part of longitudinal direction of its combined state in the mounting state across the both of dies 6 and the backer 7, the annular heat insulating air layer 11 is formed at the outer peripheral part of dies 6 and the backer 7 by housing them in the die ring 8. Therefore, the temperature reduction of dies due to the radiation is restricted, the generation of the defective shape, the uneven thickness and the inferior exit, etc., is prevented and the balanced and highly precise extruding material to be formed can be manufactured with good yield.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION This invention relates to an extrusion processing apparatus for metal profiles such as aluminum.

Conventional technology For example, as shown in FIG. 3, an extrusion processing device for aluminum profiles uses a die slide (54) fixed to the end platen (53) at the tip of a container (51) to shape the shape of the extruded product. It is designed to hold an extrusion tool (52) that determines the And this extrusion tool (5
2) is generally a die (58a) having a die hole (58a).
56), a backer (57) placed adjacent to the front side thereof
, a die ring (58) that accommodates them, and a bolster (59) disposed on the front side of the backer (57). In this extrusion processing device, the billet (B) that has been preheated and loaded into the container (51) is pressurized to expel the metal from the die hole (58a).
), a product shape (S) with a predetermined cross-sectional shape is obtained at the front.

By the way, in the extrusion processing of the aluminum shape material as described above, basically the most important thing is to obtain the best possible dimensional and shape accuracy of the shape material (S). For this purpose, the die (56) has conventionally been preheated to around 400° C. before use for extrusion to bring each part to a uniform temperature. This preheating is usually performed by heating the whole die (56) together with a backer (57) etc. in a die ring (58) as a holding tool in a die oven. It is installed and supported in the die slide (54), and moved to the extrusion position to start extrusion processing.

Problems to be Solved by the Invention However, the extrusion tool (52) including this die (56)
No matter how thoroughly the preheating is carried out, especially when trying to manufacture precision extruded molded materials with complicated shapes, as the number of extruded moldings increases, shape defects may occur due to uneven metal flow from the die (56). Problems such as uneven wall thickness, twisting of the product, and poor delivery may occur, leading to a decrease in manufacturing yield.

The present invention solves these conventional problems, prevents the occurrence of defective shapes, uneven wall thickness, poor ejection, etc. of extruded mold materials, and enables the production of well-proportioned and high-precision mold materials with a high yield. The purpose is to provide processing equipment.

Means to Solve the Problem The inventors of the present invention have conducted various experiments and research3 in order to elucidate the causes of the above-mentioned shape defects, etc., and have found that the following is one of the causes. I found out.

That is, the dice (56) are placed on the backer (56) adjacent to it.
7) and the die ring (58), but the die slide (54) for supporting the extrusion tool is normally used at room temperature without being preheated, so the die (56) The heat of Dairing (58),
Or die slide (54), end platen (53) through backer (57) and die ring (58), etc.
) side, and the heat is absorbed by the extruder main body side. For this reason, the die (5G) is gradually cooled from the front side and the outer circumferential side, and as time passes, the temperature inside the die becomes uneven, causing harmful shrinkage in the temperature drop area, which causes the extruded mold material to It has been found that this is one of the causes of defective shapes and poor appearance.

The present invention has been made based on the above-mentioned findings, and includes a configuration in which at least one of the constituent members of an extrusion tool such as a die, a backer, and a die ring is arranged in a manner that suppresses external heat radiation from the die. The gist of the present invention is an extrusion processing apparatus characterized by being provided with a heat insulating air layer.

Function In the above extrusion processing apparatus, the cross-sectional area of the heat dissipation path for the heat held by the die is narrowed due to the presence of the heat insulating air layer, and the temperature drop in the die due to heat dissipation is suppressed due to the heat retention effect of the air heat insulating layer. This suppresses the occurrence of a partial temperature drop in the die through the inside.

Example Examples will be described below.

In the extrusion processing apparatus shown in Fig. 1, (1) is a container, (2) is an extrusion tool placed at the tip of the container (1), (3) is an end platen, and (4) is an end platen (3). A die slide is mounted on the side and holds the extrusion tool (2). Moreover, in the extrusion tool (2), (
6) is a die having a die hole (6a), (7) is a backer placed adjacent to the front side of the die (6), (8) is a die ring that houses them, and (9) is a backer (7).
This is a bolster placed on the front side.

In the above extrusion processing apparatus, the billet (B) that has been preheated and loaded into the container (1) is pressurized from behind by a stem (not shown), and the billet metal is pressed into the die hole (6) of the die (6).
By extruding from 6a), a product shape (S) with a predetermined cross-sectional shape is obtained at the front.

As shown in FIG. 2, the die (6) and the backer (7) have a circumferential annular groove (10) in the intermediate part in the length direction in the combined state of the die (6) and the backer (7).
are formed, and when these are housed in the die ring (8), an annular heat insulating air layer (11) is formed around the outer periphery of the die (6) and the backer (7) as shown in FIG. ing.

The depth (d) of the annular groove (10) may be such that the surfaces of the die (6), the backer (7) and the die ring (8) are spaced apart from each other. To name 3~
It is set to 5mm.

In addition, if the width (b) of the annular groove (10) can be maintained at 174" or more with respect to the total height (h) of the die (6) and the backer (7), the effect of suppressing the temperature drop of the die will be sufficient. is normally set to about 1/2.

The heat insulating air layer ({1) reduces the contact area between the die (6) and the backer (7) and the die ring (8), suppressing heat radiation from the die (8), and suppressing the heat dissipation from the die (8).
6) receives a heat retaining effect by the heat insulating air layer (11), and as a result, the temperature drop due to heat dissipation of the die (6) is suppressed.

In addition, by forming the heat insulating air layer (11) between the mutually opposing surfaces of the extrusion tool constituent members such as the die (6), the backer (7), and the die ring (8) as described above, the heat insulating air layer (
11) can be easily shaped, which is advantageous in terms of production, as well as providing an annular groove (IO) on the outer circumferential surface of the die (6) and backer (7), which creates an insulating air layer (
11), compared to forming an annular groove on the inner circumferential surface of the die ring (8) to form an insulating air layer, The dice (6) and backer (7) can be stored smoothly without any problems, which is advantageous in terms of the work of storing them in the die ring (8).

By the way, when we stored a die with a diameter of 235#III+ and a height of 140 mm together with a backer in a die ring, preheated it, and measured the subsequent temperature change of the die,
The temperature of the die without the above-mentioned insulating air layer (1L) will increase from the preheating temperature of 4300C to 37C after 25 minutes.
On the other hand, the temperature of the die with the adiabatic air layer (1 liter) decreased only from the preheating temperature of 440QC to 4000C after 25 minutes. Converting this to unit time, if there is no insulating air layer (1I), the temperature of the die will decrease at a rate of 2.40 C/min, but if there is, the rate will decrease by 1.60 C/min.
/minute. From this result, it was confirmed that the presence of the heat insulating air layer (1 step) significantly suppresses the temperature drop due to heat radiation from the die8.

Effects of the Invention As described above, the extrusion processing apparatus of the present invention includes insulating air in at least one of the extrusion tool constituent members such as the die, the backer, and the die ring in an arrangement mode that suppresses external heat radiation from the die. Since the heat insulating air layer is provided with a layer, the cross-sectional area of the heat dissipation path for the heat held by the die is narrowed, and the air insulating layer acts to keep the die warm, so the temperature of the die due to heat dissipation is reduced. temperature drop is suppressed, and local temperature drops in the die are suppressed throughout the extrusion process. Therefore, even when extrusion processing is continued for a long time, various adverse effects caused by temperature changes in the die are avoided, and the occurrence of defects such as poor shape, uneven wall thickness, and poor ejection of the extruded material is prevented. Being done,
It becomes possible to produce a well-proportioned and highly accurate extruded material with a good yield.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a combination of a die and a bucker, and FIG. 3 is a longitudinal sectional view showing a conventional example. (2)...Extrusion tool, (6)...Dice, (7)...
... Backer (8) ... Guiling, (l1) ...
・Insulating air space. that's all

Claims (1)

[Claims] An extrusion processing apparatus characterized in that at least one of extrusion tool constituent members such as a die, a backer, and a die ring is provided with a heat insulating air layer in an arrangement that suppresses external heat radiation from the die.