JPH04251667A - Automatic gas cutting machine - Google Patents

Abstract

PURPOSE:To dissolve the fact that the preheat is not sufficient and to prevent the abnormal quality by connecting and arranging the computing element which computes the most feasible preheating time corresponding to the thickness of the material to be cut and the position of cutting beginning. CONSTITUTION:The guarder 1 of the gas cutting machine is moved to the longitudinal direction of the material to be cut on the rail 3 with the forward and backward driving device 2. The carriage 4 mounts the torch 5 and is freely movable to the longitudinal direction (the lateral direction of the material to be cut) of the guarder with the lateral motion driving device 6. These forward and backward, lateral motions are controlled with the computing element 7 connected to the gas cutting machine. The cutting order is decided with the dimension (thickness, width, length) of the material to be cut and the dimension made to the products, and number of pieces, after the torch is moved and set at the cutting beginning position, the preheating is executed with the preheating time computed the prescribed equation. Therefore, the fact that the preheating is not sufficient can be dissolved, the excellent effect can be obtained without generation of abnormal quality of burn through, etc., at the cutting beginning point.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic gas cutting machine for dividing and cutting relatively heavy materials such as iron plates.

0002

2. Description of the Related Art In gas cutting, it is necessary to preheat the cutting starting point and sufficiently heat the cutting point before starting cutting. However, in the past, the preheating time was determined by the operator while visually checking the preheating status, which resulted in large individual differences, resulting in over or under preheating, resulting in quality defects such as inability to cut or burn-through at the corners of the preheated part. Was. For this reason, Japanese Patent Laid-Open No. 62-270276 is known as a proposal.

0003

[Problem to be solved by the invention] JP-A-62-2702
The proposal in Publication No. 76 discloses that the preheating time is determined depending on the material and thickness of the material to be cut, and is preset in the control device in advance. As a result, the cutting start point must be located outside of the planned location where the product is to be sampled, resulting in a low yield. Therefore, an object of the present invention is to provide an automatic gas cutting machine that does not cause cutting failure or quality defects, and does not cause a decrease in yield.

0004

[Means for Solving the Problems] In order to advantageously solve the above-mentioned problems, the present invention provides an automatic gas cutting machine equipped with a cutting torch movable in the longitudinal direction and the width direction of the material to be cut. This is an automatic gas cutting machine that is connected to a computer that calculates the optimal preheating time depending on the thickness of the material to be cut and the cutting start position.

[0005]

[Operation] In the present invention, the preheating time of the plate end, which is the cutting start position, is a function of the thickness of the material to be cut, and τ=At+B …………………… (1) τ: Preheating time (sec.) t : Thickness of the material to be cut (mm) A, B: Expressed by a constant formula depending on the material of the material to be cut,
Each time preheating is performed, the preheating time is input into the computer and calculated, and the preheating time is set. The above preheating time is the preheating time at the end where cutting is first performed, and when cutting is continued from the end face that has been cut once, the above calculation machine calculates the preheating time using the following formula according to the preheating start position of the end face. However, shorten the preheating time by at least one day.

That is, in the present invention, as shown in FIG. 3, the distance between the shavings produced by cutting and the cutting start point K is divided into several types depending on the cutting start position according to the order of cutting.
By multiplying equation (1) by a coefficient Ci that differs for each section, the preheating time for the second and subsequent cutting is determined as shown in equation (2).

[0007] τ'=Ci (At+B) (2) Ci: Coefficient that depends on the cutting start position i=2~n However, the reason for this is that in the second and subsequent cuts, the temperature of the material to be cut is lower than that of the first cut. If the same preheating time as the first cutting is applied, preheating will be over-heated due to the fact that the preheating flame is likely to concentrate because the edge waste 13 generated by cutting is located close to the cutting start position, etc. This is because quality defects such as burn-through at corners may occur. In the present invention, such a computing machine is connected to a gas cutting machine and gas cutting is performed based on the calculation result, so that gas cutting can be performed with optimal preheating and no quality defects.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus according to an embodiment of the present invention. FIG. 1 is an overall plan view, and reference numeral 1 denotes a girder of a gas cutting machine, which is moved in the longitudinal direction of a material to be cut on a rail 3 by a forward and backward drive device 2. A carriage 4 is equipped with a torch 5 and is movable in the longitudinal direction of the girder 1 (in the width direction of the material to be cut) by a traverse drive device 6.

[0009] These forward and backward movement and lateral movements are controlled by a computer 7 connected to the gas cutting machine. In other words, the dimensions of the material to be cut (thickness, width, length) and product sampling dimensions,
The cutting order is determined from the number of sheets, and after moving and setting the torch 5 to the cutting start position, τ=At+B …………………… (1) τ: Preheating time (sec.) t: Thickness of the material to be cut (mm) ) A, B: Constants that depend on the material of the material to be cut The calculator 7 calculates the preheating time for the first cutting using the above equation (1), and after preheating the torch 5 for the corresponding time, starts cutting. In order to do this, the forward/backward drive device 2 or the traverse drive device 6 is driven.

[0010] After making the first cut in this way, when preheating and cutting is subsequently performed using the cut end surface as the cutting start point, the cut end surface is at a high temperature from the first cut, so the temperature is the same as the first cut. If the preheating time is too long, the preheating will be over-heated and problems will occur. For this reason, the computing unit 7 is as follows (
2) Determine the preheating time using the formula.

[0011] τ'=Ci(At+B) (2) Ci: coefficient depending on the cutting start position i=2~n After preheating for the preheating time τ' obtained in this way, the computer 7 The forward and backward drive device 2 or the traverse drive device 6 is driven to cause the torch 5 to perform cutting. Although the apparatus of the present invention has the above configuration and functions, a specific example of cutting using the apparatus of FIG. 1 will be explained based on FIG. 2.

FIG. 2 shows an example of the preheating time for cutting using the cutting machine shown in FIG. In the figure, the thickness is 10m.
When cutting finished products 9 to 12 from the cutting material 8, which is ordinary steel of m, first cut a, b, c, d, then b, e,
After cutting h, c, f, i, d, g, and j at the same time, cutting is performed in the order of hi, ij, ef, and fg. At this time, the constants A and B of the equation (1) and the coefficient Ci of the equation (2) that determine the preheating time are divided into two types: A=0.2, B=7.3, and Ci are divided into two types, and the cutting start position b , c, d, e for 0.8 seconds,
The cutting start positions f, h, and i are 0.4. Therefore, the preheating time is 9.3 seconds at cutting start position a and 7.3 seconds at cutting start position a, and 7.3 seconds at cutting start position a.
4 seconds, and 3.7 seconds for f, h, and i. As a result of preheating and cutting by the preheating time calculated by the computer 7 and by the torch 5, the automatic gas cutting was performed successfully without insufficient preheating or burn-through of the corners due to overheating. was able to execute.

[0013]

[Effects of the Invention] The present invention has a computer connected to an automatic gas cutting machine that calculates the optimal preheating time according to the thickness of the material to be cut and the cutting start position, thereby eliminating the problem of excessive or insufficient preheating. This provides an excellent effect in that quality abnormalities such as burn-through do not occur at the cutting starting point.

[Brief explanation of the drawing]

FIG. 1 is an explanatory plan view showing the configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of calculation of preheating time using the apparatus of the present invention.

FIG. 3 is an explanatory diagram showing that it is necessary to change the preheating time during second and subsequent cutting.

[Explanation of symbols]

1 Girder 2. Forward and backward drive device 3 Rail 4 Carriage 5 Torch 6 Traverse drive device 7 Computing machine 8 Material to be cut 9-12 Finished product

Claims (1)

[Claims] Claim 1. An automatic gas cutting machine equipped with a cutting torch that is movable in the longitudinal and width directions of the material to be cut. An automatic gas cutting machine characterized by a connected arrangement of a computing machine that performs calculations.