JPH0464482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an extrusion molding die for forming the cross-sectional outer periphery (hereinafter simply referred to as outer periphery) of a molded article during extrusion molding.

[Conventional technology]

Extrusion molding is a method that can produce products with high productivity that are wide in width, long in length, and have high dimensional accuracy, for example in the fields of asbestos/cement, plaster, ceramics, and plastic building materials.

In this method, the outer periphery of the base material is formed by extruding it from a die attached to the extrusion direction end of an extrusion molding machine such as a screw type extruder, and if the member has a hollow part, the die Above all, the hollow part is molded using a core at the same time as the outer periphery is molded.

For extruded products, most of the outer periphery shapes may be the same and only some parts may differ, but even in this case, separate ferrules corresponding to each outer periphery shape are required, reducing the number of ferrules that need to be stored. Not only are they bulky, but the die is made to be strong because it is subjected to extrusion pressure, and therefore a large amount of manpower and time is required to attach and remove these heavy die fittings from the extrusion molding machine.

In addition, the uncured molded body whose outer periphery is molded with a die should be properly cured if hydraulic materials such as asbestos, cement, or gypsum are used as the raw material, and cooled if plastic is used. This results in a product, and there is almost no dimensional error between the outer peripheral shapes of the uncured molded product and the cured product.

However, when using ceramic raw materials,
The molded body becomes a product through the drying, calcination, and firing processes, so it shrinks during each process, especially the calcination process, and the outer circumference of the molded body, that is, the inner circumference of the die, becomes larger than the outer circumference of the product. The degree of this difference varies depending on the blend of raw materials and the degree of calcination and firing, so even when manufacturing products with the same outer shape, the blend of raw materials,
A large number of ferrules are required depending on the degree of calcination and firing, and a great deal of effort and time is required to attach and detach the ferrules.

[Problem to be solved by the invention]

The present invention provides an extrusion mold that can easily adapt to changes in the outer circumferential shape of a molded article, and aims to solve the above-mentioned drawbacks of the conventional die.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has a mounting plate that is fixed to an end in the extrusion direction of an extrusion molding machine and has an opening through which the base material is extruded, and a mounting plate that comes into contact with an adjacent block and jointly covers the outer periphery of an extrusion molded product. In an extrusion mold consisting of a plurality of blocks that are molded and removably attached to the surface of the mounting plate in the extrusion direction, there are two or more blocks per side that extrude one or more sides of the outer periphery. The present invention provides an extrusion mold characterized by comprising a block.

[Effect]

The present invention will be explained using the drawings.

FIG. 1 is a perspective explanatory view of an embodiment of the present invention.

Reference numeral 1 denotes a mounting plate fixed to an end in the extrusion direction of an extrusion molding machine (not shown) and having an opening through which the base material is extruded, and is fixed to the extrusion molding machine through bolt holes 2 with bolts and nuts (not shown).

3 is a plurality of blocks, and a plurality of adjacent blocks come into contact with each other and jointly shape the outer periphery of the material extruded from the opening of the mounting plate 1 to form a molded body. 1 is removably attached to the surface in the extrusion direction (arrow in the figure) by bolts and nuts (not shown) through bolt holes 4, and in the embodiment shown in FIG. It is extruded in three blocks.

The base material is press-fitted into a space surrounded by a plurality of blocks 3 from the back side of the mounting plate 1 in the drawing, and is continuously formed into an extrusion molded body.

When changing part or all of the outer circumferential shape of an extrusion molded product, it is only necessary to attach and remove the block corresponding to the part to be changed, and there is no need to attach or remove the entire nozzle as in the conventional case. 1 of the surface circumference
Since the blocks for extrusion molding one side or two or more sides are composed of two or more blocks per side, it is possible to easily accommodate various changes in the cross-sectional outer peripheral shape of the extruded product.

The material, shape, and attachment method of the mounting plate and block in the mold of the present invention are appropriately selected in consideration of the shape of the product, the characteristics of the base material, extrusion pressure, economic efficiency, and the like.

〔Example〕

The present invention will be explained using drawings showing examples.

FIG. 2 is an explanatory view showing the attachment and detachment of the block corresponding to a change in the outer peripheral shape of the extrusion molded body, and the mounting plate is omitted from the illustration.

First, a molded body having the outer peripheral shape shown in a is
It was molded using the block arrangement shown in the figure.

Next, the molded body having the outer peripheral shape shown in c is
It was molded using the block arrangement shown below.

In order to change the outer peripheral shape from a to c, according to the present invention, it is possible to simply change the blocks 3a, 3b, and 3c to blocks 3d, 3e, and 3f, respectively, and there is no need to attach or detach the mounting plate, which is extremely simple. Conventional caps require the entire cap to be attached and removed.

〔Effect of the invention〕

According to the present invention, it is possible to easily respond to various changes in the outer circumferential shape of an extrusion molded body without requiring replacement of the entire die.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view of an embodiment of the present invention, and FIG. 2 is an explanatory view showing the attachment and detachment of a block corresponding to a change in the outer peripheral shape of an extrusion molded body. 1...Mounting plate, 2...Bolt hole, 3, 3a, 3
b, 3c, 3d, 3e, 3f...Block, 4...
...Bolt hole.

Claims (1)

[Claims] 1. A mounting plate which is fixed to the extrusion direction end of the extrusion molding machine and has an opening through which the base material is extruded, and a mounting plate which contacts an adjacent block and cooperates to form the cross-sectional outer periphery of the extrusion molded product, and which extrudes the mounting plate. In an extrusion molding die consisting of a plurality of blocks removably attached to a directional surface, the number of blocks extruding one or more sides of the outer periphery of the cross section is 2 per side.
An extrusion mold characterized by consisting of more than one block.