JPH0513044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of extrusion molding an inorganic product having recesses of a desired shape formed on its surface.

(Prior Art) Conventionally, inorganic products having recesses of a desired shape formed on their surfaces are generally manufactured by press molding.

(Problems to be Solved by the Invention) However, the press molding method requires batch work, resulting in low productivity and high costs.

It is an object of the present invention to eliminate these conventional disadvantages.

(Means for Solving the Problems) The present invention involves continuously forcing an inorganic composition such as cement or gypsum into a die, and protruding a movable die from the inner wall of the die, and determining the degree and time of the protrusion. The method is characterized in that a recessed portion having a desired shape is formed on the surface of the extrusion molded body according to the desired shape.

(Function) As shown in FIG. 1A, an inorganic composition 2 such as cement or gypsum is pushed into the die 1 at a predetermined speed, and as shown in FIG. The die 1 is moved downward by a length corresponding to the depth of the die 1 and protrudes from the inner wall of the die 1. After that, if the movable die 3 is kept stationary at that position, the movable die 3 will move as the inorganic composition 2 moves.
Accordingly, a recess 4 of a desired depth is formed by the width of the movable die 3.
is formed to the desired length L (FIG. 1C). Then, the movable die 3 is raised to the inner wall surface of the die 1 (FIG. 1D).

By attaching an arbitrary number of movable dies 3 to the die 1, an inorganic product having a desired irregular cross section can be manufactured depending on the number of movable dies 3 and the number of intermittent reciprocating movements of each movable die 3.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an extrusion molding apparatus having a vacuum extruder 5 used in the extrusion molding method of the present invention.

In the figure, 6 is a vacuum chamber, the upper screw cylinder 7 and the lower screw cylinder 8 are communicated with each other via the vacuum chamber 6, and short fibers are blended into one end of the upper screw cylinder 7. A hopper 9 for supplying the inorganic composition 2A is provided, and a die 1 having a die opening 12 having a rectangular cross-sectional shape, for example, is inserted into the end of the lower screw cylinder 8 via an adapter 11 for introducing the reinforcing member 10. Installed consecutively. In the illustrated example, the adapter 11 includes:
The above-mentioned reinforcing member 1
Although one die 0 is shown, for example, eight die 1 are introduced, and a transfer conveyor 15 is installed in front of the die 1.
The extrusion molded body 16 is cut into a desired length by a cutter 17 and then transferred onto a pallet 18 in front of the extruded body 16.

A plurality of the movable dies 3 described above were disposed on the die 1 so as to freely protrude from the inner wall of the die 1, for example, four movable dies 3 were disposed on each side thereof. And the movable die 3
is assumed to be hydraulically or mechanically driven, and the drive is performed as set by a programming device (not shown).

In the figure, 19 ₁ and 19 ₂ indicate the screws in the screw cylinders 7 and 8.

Next, the extrusion molding method of the present invention will be explained.

First, the hopper 9 is supplied with an inorganic composition 2A mainly composed of cement mixed with short fibers of wholly aromatic polyamide, for example. The supplied inorganic composition 2A passes through the screw 1 in the upper screw cylinder 7.
9 ₁ while being kneaded and transferred to the vacuum chamber 6, where it is degassed, transferred to the lower screw cylinder 8, and guided to the adapter 11.

At the same time, a plurality of reinforcing members 10 made of long fibers made of long fibers of wholly aromatic polyamide knitted in a braided manner are soaked in a bath 14 of impregnation with an uncured binder 13 made of thermosetting epoxy resin. the reinforcing members 10 are impregnated with the binder 13, and the reinforcing members 10 are introduced into the adapter 11;
It is embedded at a desired position within the inorganic composition 2A extruded from the lower screw cylinder 8.

The inorganic composition 2A pushed into the die 1 together with the reinforcing member 10 is changed in cross section by the movable die 3 protruding from the inner wall of the die 1, and is shaped into a desired shape from the die opening 12, in the illustrated example a hollow square shape. It becomes a body and is pushed out. The extruded molded product 16 is cut into a desired length by a cutter 17 while being transported forward by the transfer conveyor 15, and the cut extruded molded product 16 is placed on a pallet 18 in front of the conveyor 15 and placed in an autoclave (not shown). The inorganic composition 2A mixed with the short fibers of the extruded body 16 and the binder 13 impregnated into the reinforcing member 10 are simultaneously cured in an autoclave to obtain a fiber-reinforced inorganic product.

The third figure shows a fiber-reinforced inorganic product 20 produced by the above method.

The illustrated one can be used as a pillar of a building, for example, and the concave portion 4 at the end can be connected to the product 20 by fitting the convex portion of the joining member together with an adhesive or the like. Used to connect other products such as beams.

In the above embodiment, the movable die 3 is arranged so as to be able to protrude from the upper, lower, left and right sides of the inner wall of the die 1, but the movable die 3 may be protruded from less than four sides.

(Effects of the Invention) According to the present invention, an inorganic composition is continuously forced into a die, and a movable die is made to protrude from the inner wall of the die, and the surface of the inorganic product is Since a recessed portion having a desired shape is formed, productivity is higher and costs are lower than in conventional press molding methods.

[Brief explanation of the drawing]

Figures 1A, B, C, and D are explanatory diagrams of the extrusion molding method of the present invention, Figure 2 is a diagram of an extrusion molding apparatus having a vacuum extruder used in the method of the present invention, and Figure 3 is a diagram of the method of the present invention. FIG. 2 is a perspective view of a main part of an example of an inorganic product produced by the method. 1... Dice, 2... Inorganic composition, 3... Movable die.

Claims (1)

[Claims] 1. While continuously pushing an inorganic composition such as cement or gypsum into a die, a movable die is made to protrude from the inner wall of the die, and a recess of a desired shape is formed on the surface of the extruded product depending on the degree and time of the protrusion. A method for extrusion molding an inorganic product, characterized by forming.