JPH04228223A - Extrusion machining equipment - Google Patents

Abstract

PURPOSE:To provide a layer of heat insulating materials 20 in the middle part of the thickness direction of a die ring in an extruding tool. CONSTITUTION:The temperature of a die 3 is restrained from escaping externally through the die ring 6, and thereby the die 3 is restrained from being cooled from the outer circumference. Consequently, the inconsistency of the die temperature is controlled, the development of a faulty extrusion, defective shape, insufficient accuracy, etc., of the extruding materials is prevented, and the well-proportioned, highly accurate extruding materials are manufactured.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion processing apparatus, and particularly to an extrusion processing apparatus for metals such as aluminum materials.

0002

2. Description of the Related Art In an extrusion processing apparatus for aluminum materials, etc., as shown in FIG. ) is held by a die slide (5) fixed to the end platen (8) side. The extrusion tool (1) generally includes a die (3) having a die hole (3a), a backer (4) disposed adjacent to the front side of the die, a die ring (6) housing them, and a backer (4). It includes a bolster (7) placed on the front side, and is configured by a combination thereof. and,
By pressurizing the billet (B) that has been preheated and loaded into the container (2), the extruded material is extruded from the die hole (3a) of the die (3), thereby producing a product shape (S) with a predetermined cross-sectional shape in the front. is assumed to be obtained.

By the way, in the above-mentioned extrusion processing of aluminum materials, etc., the most important thing is to obtain the best possible dimensional and shape accuracy of the extruded material. For this purpose, the die (3) has conventionally been preheated to around 400° C. in a die oven to bring each part to a uniform temperature before use for extrusion. This preheating usually involves placing the dice (3) on the backer (4).
) etc., and heats the whole body in a die ring (6) as a holding tool. After preheating, it is assembled into a die slide (5) and supported, and moved to the extrusion position to extrude. Processing is about to start.

0004

[Problems to be Solved by the Invention] However, no matter how thoroughly the extrusion tool (1) including the die (3) is preheated, especially when attempting to manufacture a precision extruded material with a complicated shape, In particular, as the number of extrusions increases, irregularities in the metal flow from the die can lead to poor shape, irregular wall thickness, and twisted products, which are factors that reduce yield.

[0005] The inventors of the present invention have conducted various experiments and researches in order to elucidate the cause, and have found that the following causes the problem.

That is, the die (3) is used by preheating the entire die together with the backer (4) and die ring (6) adjacent to it, but the bolster (7) adjacent to the front side of the backer (4) and die slide for supporting extrusion tools (5
) is normally used at room temperature without being preheated, so the heat of the die (3) is transferred to the outside through the die ring (6) during extrusion. For this reason, the die (3) is gradually cooled from the outer circumferential side, and as time passes, the temperature inside the die becomes uneven, causing harmful shrinkage in the area where the temperature decreases, which causes a defect in the shape of the extruded material. It has become clear that this is one of the causes of poor appearance.

[0007]

[Means for Solving the Problems] Based on the above findings, the present invention provides a heat insulating layer on the die ring directly adjacent to the die, in order to enable precision extrusion with even higher precision. is provided to prevent heat from escaping from the dice and to maintain a uniform temperature state.

[0008] Accordingly, the present invention provides an extrusion processing apparatus characterized in that a heat insulating material layer is provided in the middle part in the wall thickness direction of the die ring in the extrusion tool or in a lining state on the inner peripheral part. This is the summary.

[0009]

[Operation] In the extrusion processing apparatus according to the present invention, the heat insulating layer is provided to suppress heat from the die from being transmitted to the outside through the surrounding members. Therefore, heat dissipation of the die is prevented, and its temperature is prevented from decreasing locally, and its temperature is maintained uniformly throughout the extrusion process.

0010

[Example] In the example shown in FIGS. 1 and 2, (
1) is an extrusion tool, (2) is a container, (3) is a die,
(4) is a backer, (5) is a die slide, (6) is a die ring, (7) is a bolster, and (8) is an end platen.

The embodiment shown in FIG.
A slit-shaped annular groove (
13), and a heat insulating material layer (20) is provided thereon in a filled state. Although this embodiment has the disadvantage of requiring the groove (13) to be carved in the die ring (6), it is suitable for protecting the heat insulating layer (20) and increasing its lifespan.

The embodiment shown in FIG. 2 also has a die ring (6
) is provided with a heat insulating material layer (20) lined on the inner peripheral surface thereof.

In each of the above embodiments, the temperature of the die (3) is prevented from escaping to the outside through the die ring (6), and the die (3) is prevented from being cooled from the outer peripheral surface side. Can be suppressed.

[0014] The heat insulating material layers (10) and (11) are as follows:
It goes without saying that it should be constructed with a heat-resistant insulating material such as glass wool or asbestos.

[0015]

Effects of the Invention As described above, the present invention provides a heat insulating material layer in the middle part in the wall thickness direction of the die ring in an extrusion tool or in a lined state on the inner peripheral part. This suppresses the temperature of the die (3) from escaping to the outside through the extrusion process, suppresses cooling of the die (3) from the outer peripheral surface side, and suppresses a partial temperature drop in the die during extrusion processing. Therefore, even when extrusion processing is continued for a long time, various problems caused by temperature changes of the die can be avoided, and the extruded material can be prevented from coming out poorly, having poor shape, etc.
It becomes possible to prevent the occurrence of precision defects and the like, and to manufacture a well-balanced and highly precise extruded material.

Furthermore, since the die ring is provided with a heat insulating material layer, there is also the advantage that even if the die is changed, the same die ring having a heat insulating material layer can be used in common.

[0017] In addition, by providing a lining in the middle part in the wall thickness direction or in the inner peripheral part, heat insulation is performed at a position very close to the die, and heat radiation from the die can be effectively suppressed. At the same time, contact of the heat insulating material with the die slide and exposure to the outside can be avoided, thereby extending the life of the heat insulating material.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of an extrusion processing apparatus of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment.

[Explanation of symbols]

1...Extrusion tool 2...Container 3...Dice 6... Dairing 20...Insulating material layer

Claims (1)

[Claims] 1. An extrusion processing apparatus characterized in that a heat insulating material layer is provided in the middle part in the wall thickness direction of a die ring in an extrusion tool or in a lining state on the inner peripheral part.