JPH0516120A - Cutting method for extrusion molded item reinforced with iron bars - Google Patents

Abstract

PURPOSE:To cut surely and economically by removing a base of given length portion of a raw material in the process of extrusion molding by means of water jetting and cutting exposed reinforcing bars by laser beam in the cutting process of an extrusion molded item reinforced with iron bars. CONSTITUTION:A base is manufactured by kneading cement and asbestos as main raw materials with water, and extrusion molding of an extruded product 2 reinforced with iron bars is carried out by using deformed iron bars. While a water jet nozzle 5 is moved in the width direction of the green product 2 in the given position during extrusion molding and also moved in the extrusion direction in synchronization with the extrusion speed, the product 2 is jetted by the water jet 5 to remove the uncured base and expose the iron bars. Then, while a carbon dioxide gas laser beam generating device is moved in the width direction of the product 2 at the positions of the exposed iron bars and also moved in the extrusion direction 6 in synchronization with the extrusion speed, laser beam 6a is emitted to the exposed iron bars to cut the iron bars.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a rebar-reinforced extruded green (uncured) product.

[0002]

2. Description of the Related Art Extruded products made from a base material mainly made of cement and asbestos can be efficiently manufactured into products having various cross-sectional shapes and lengths, and are therefore widely used as interior / exterior materials to improve the strength. For wire mesh, or diameter 2-3
A thin iron wire of about mm is extruded into a base material at the same time as a reinforcing material and molded, and when a raw product in which the base material is uncured is cut with a diamond cutter or the like, the reinforcing material is cut together with the base material.

In order to further improve the strength of the product, when a reinforcing bar having a diameter larger than that of the above-mentioned iron wire is extruded together with the base material and the reinforcing bar is to be cut together with the base material, the deformation of the uncured base material is increased due to being pushed by the reinforcing bar, and the base material is cured It is uneconomical because the number of cuts in the finishing cutting afterwards is large, and cutting at a position where there is no reinforcing bar not only requires the work of cutting the reinforcing bar in advance and intermittently inserting it, but also There is a problem that it is difficult to insert the reinforcing bar due to the backflow of the base material into the insertion guide, and when a plurality of reinforcing bars are pushed out at a predetermined position, the non-rebar part disappears.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a method for cutting a reinforcing bar reinforced extrusion molded product which solves the problems of the prior art.

[0005]

In order to solve the above-mentioned problems, the present invention, when cutting a reinforcing bar reinforced extrusion molded raw product, uses a water jet to squeeze the raw product under extrusion molding into a base material of a predetermined length. The present invention provides a method for cutting a reinforcing bar reinforced extrusion molded raw product, which comprises cutting the exposed reinforcing bar with a laser beam after the removal.

[0006]

The method of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 1 (a) is a plan view,
FIG. 1B is a view taken along the line AA in FIG.
1 is a receiving line such as a roller conveyor for receiving 2, 4 is a reinforcing bar, 5 is a water jet nozzle (not shown in FIG. 1A), 5a is a water jet, and 6 is FIG.
A laser beam generator, not shown in FIG.
Reference numeral 6a denotes a laser beam, and the arrow in the figure indicates the extrusion direction.

The raw product in which the base material and the reinforcing bar are extruded at the same time from the extruder is a predetermined length portion in consideration of the product length, moves in the width direction of the raw product, and the extrusion speed of the raw product in the extrusion direction. The uncured substrate is removed by the water jet ejected from the water jet nozzle that moves in synchronism with, and the reinforcing bar is exposed. The extrusion direction length for removing the base material may be about 10 mm, and the diameter of the water jet, the pressure, and the water amount are appropriately determined in consideration of the thickness of the raw product, the time allowed for the removal of the base material, and the like.

After the removal of the base material is completed, the water jet nozzle returns to the original position and repeats the operation of performing the next base material removal. The exposed rebar is installed downstream of the water jet nozzle in the extrusion direction, moves in the width direction of the raw product, and is a laser beam emitted by a laser beam generator that moves in synchronization with the extrusion direction of the raw product in the extrusion direction. Is cut by. The type and output of the laser beam are appropriately determined in consideration of the thickness and the number of reinforcing bars, the time allowed for cutting, and the like.

The laser beam generator that has finished cutting the reinforcing bar returns to the original position and repeats the operation of cutting the next reinforcing bar. Since the present invention cuts the raw product by removing the base material with a water jet and cutting the reinforcing bar with a laser beam, not only can the raw product be reliably cut, but there is no deformation of the raw product in the cutting portion, and the final product is The end cut length of 15 to 20 mm is sufficient, which is economical.

[0010]

[Examples] Cement and asbestos as main raw materials were kneaded with water to form a base, and three deformed rebars with a diameter of 10 mm were used. The cross-sectional shape of the rebar-reinforced extruded raw product having a width of 600 mm and a thickness of 150 mm shown in FIG. Extrusion was performed. During extrusion molding, a water jet nozzle having an inner diameter of 0.2 mm is moved at a predetermined position in the width direction of the raw product, and in the extrusion direction while being synchronized with the extrusion speed, the pressure is 3000 kgf / cm.
^2. A water jet having a water amount of 4.2 liters / min was sprayed on the raw product to remove the uncured base material to expose the reinforcing bar. The time required to remove the base material and expose the reinforcing bars was 18 seconds.

Next, the carbon dioxide gas laser beam generator is
At the position of the exposed rebar, the raw product was moved in the width direction and moved in the extrusion direction while being synchronized with the extrusion speed, and the exposed rebar was irradiated with a laser beam to cut the rebar. The time required for cutting the reinforcing bar was 10 seconds. There is no deformation in the raw product of the cutting part, and the end cutting length at the time of final finishing after curing is 15
Only mm, a rebar reinforced extruded green product could be cut reliably and economically.

[0012]

EFFECTS OF THE INVENTION Rebar-reinforced extruded green products can be cut reliably and economically.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an implementation state of the present invention.

FIG. 2 is a view showing a cross-sectional shape of a reinforcing-bar-reinforced extruded product in an example.

[Explanation of symbols]

 1 Extrusion Molding Machine 2 Extrusion Molding Raw Product 3 Receiving Line 4 Reinforcing Bar 5 Water Jet Nozzle 5a Water Jet 6 Laser Beam Generator 6a Laser Beam

Claims (1)

Claim: What is claimed is: 1. When cutting a reinforcing bar-reinforced extrusion molded raw product, after removing the raw material of the extrusion molding from the base material of a predetermined length by water jet, the exposed reinforcing bar is removed. A method for cutting a rebar-reinforced extruded raw product, which comprises cutting with a laser beam.