JPH07157858A - Marking method and marking device - Google Patents

Abstract

(57) [Summary] [Purpose] When performing marking (marking) of a figure by spraying fusible powder on the material to be marked and drawing it,
The thickness of the marking line is kept substantially constant regardless of the fluctuation of the moving speed of the nozzle. A nozzle 7 is attached to a carriage 4 of an NC cutting device having a frame 2 and a carriage 4 controlled by an NC device 8. The nozzle 7 and a container 26 containing a fusible powder 25 are connected and the container 26 To transport gas hose 2
8. Connect the adjusting gas hose 29. Each hose 28, 29 is provided with a valve 31, 32 for adjusting the flow rate or pressure of gas.
The controller 30 detects the moving speed of the nozzle 7 and controls the valves 31 and 32 according to the detected speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking method in which a fusible powder is melted and sprayed on a material to be marked and a nozzle is moved to draw a wire. It relates to a method and an apparatus.

[0002]

2. Description of the Related Art A nozzle, such as a gas cutting crater, having a hole for injecting cutting oxygen in the center and a hole for injecting a mixed gas of fuel gas and oxygen forming a flame around the hole is used.
A marking (marking) method is one in which fusible powder such as metal powder or plastic powder is mixed and injected into oxygen from the central hole, and the fusible powder is sprayed onto the material to be marked and the nozzle is moved to draw the wire. Known (Japanese Patent Publication No. 49-31520).

The marking operation itself is intended to mark a working reference line or a dimensional reference line in a subsequent process by marking a material to be marked.

On the other hand, recently, a frame movably mounted on a rail and an operating block capable of traversing in a direction orthogonal to the rail are mounted on the frame, and the block is controlled by a numerical control (NC) device. An apparatus has been put into practical use that is capable of moving on a plane coordinate at high speed and with high accuracy by controlling and moving in the rail direction and a direction orthogonal to this direction.

The NC device is used as a high-speed and high-precision cutting machine by attaching a plasma cutting torch or a gas cutting torch, which is a cutting blade, and is equipped with a marking device using the above-mentioned marking method. It is used as a dedicated marking machine or a cutting / marking machine.

That is, zinc powder mixed with oxygen is jetted from the hole at the center of the nozzle mounted on the NC cutting device, and a flame is formed in the surrounding holes to spray molten zinc on the work material. By maintaining the state and moving the nozzle along the contour line of the figure input in advance to the NC device, it is possible to mark a figure consisting of a continuous line on the surface of the work material, and a marking line with high speed and high accuracy Is obtained.

[0007]

When the nozzle for carrying out the above marking method is mounted on the NC cutting device for marking, the movement of the frame traveling on the rail and the movement of the carriage traversing the frame are combined. This moves the nozzle. Therefore, when the figure to be marked has a refraction point, it is necessary to control the frame speed and the carriage speed individually and simultaneously. However, the NC cutting device has a large inertia, and it is difficult to rapidly change the moving speed of the nozzle. Therefore, the NC cutting device inevitably has a predetermined length section and an arc section before and after the inflection point of the figure. There is a problem that the speed must be reduced.

That is, for example, as shown in FIG. 4 (a), when marking a graphic 51 having sharp-angled refraction points 52, 53, the speed of the NC cutting device is as shown in FIG. 4 (b).
It is controlled so that the speed is gradually reduced from the straight line portion on the upstream side of the inflection points 52 and 53, and the speed is increased when the vehicle passes through the inflection points 52 and 53 and enters a straight line. Similarly, when the figure 51 has an arc 56 defined by the points 54 and 55, the speed of the arc 56 is controlled to be lower than the speed of the straight line portion (57 is a start point and 58 is an end point). Is).

On the other hand, the apparatus for carrying out the marking method is configured to consume a fixed amount of fusible powder per unit time, as shown in FIG. For this reason,
There is a problem that the amount of fusible powder forming the marking line changes according to the change in the velocity that occurs when moving the nozzle along the contour line of the figure 51, and as a result, the thickness of the marking line changes. Occurs.

The above problems adversely affect the positioning accuracy and dimensional accuracy when the marking line is used as a processing reference line in the subsequent process, or when the fusible powder forming the marking line is zinc. A notch is formed on the cut surface, which leads to a problem that the cutting cannot be continued in an extreme case.

An object of the present invention is to provide a marking method for keeping the thickness of the marking line substantially constant regardless of the change in the moving speed of the nozzle, and a marking device for carrying out this method.

[0012]

In order to solve the above-mentioned problems, a marking method according to the present invention is to inject a gas mixed with fusible powder from a hole formed at the center of a nozzle and to the periphery of the hole. With the marking method when a flame is formed in the formed hole and the molten fusible powder is sprayed onto the material to be marked and the nozzle is moved to draw the wire, the marking device is installed in a processing device controlled by a numerical controller. It is characterized in that the amount of fusible powder mixed in the gas is adjusted according to the moving speed of the nozzle.

Further, the marking device is mounted on a processing device controlled by a numerical control device, and has a hole for injecting a gas mixed with fusible powder in the center and a hole for forming a flame around the hole. The formed nozzle is connected to the hole formed in the center of the nozzle to accommodate the fusible powder therein, and the carrier gas supply hole for conveying the fusible powder and the supply amount of the fusible powder are adjusted. A carrier gas supply pipe having a carrier gas adjusting hole for connecting a carrier gas supply hole of the container and a carrier gas supply source and a carrier gas supply source and adjusting a flow rate or a pressure of the carrier gas; An adjusting gas supply pipe having an adjusting gas adjusting valve for connecting the adjusting gas supply hole and the adjusting gas supply source and adjusting the flow rate or the pressure of the adjusting gas, the carrier gas adjusting valve for detecting the moving speed of the nozzle, and Or a control unit for controlling the conditioning gas regulating valve is intended to be configured.

[0014]

According to the above marking method, the thickness of the marking line can be kept substantially constant regardless of the change in the moving speed of the nozzle.

When the fusible powder is thermally sprayed and drawn for marking, the thickness of the marking line depends on the diameter of the central hole of the nozzle, the moving speed of the nozzle, and the supply amount of the fusible powder per unit time. Is uniquely determined by That is, when any one of the above conditions is changed, the thickness of the marking line changes according to this change.

Normally, the nozzle is not replaced during the operation of forming the marking, and even if the nozzle needs to be replaced, the nozzle having the same center hole diameter is selected. It Therefore, it does not matter if the condition that the central hole of the nozzle changes is excluded.

The supply amount of the fusible powder is the flow rate or pressure of the gas that conveys the fusible powder, or the flow rate or the pressure of the gas that adjusts the supply amount by stirring the fusible powder contained in the container. Set by. Usually, each of the gases is supplied from a sufficiently stable supply source, and the flow rate and pressure are adjusted via a flow rate or pressure adjusting mechanism. Therefore, there is a very low possibility that the flow rate or the pressure of each gas will change during the marking operation.

That is, the variation in the thickness of the marking line may be caused mainly by the variation in the moving speed of the nozzle.

Therefore, an appropriate amount of fusible powder is set according to the moving speed of the nozzle, the moving speed of the nozzle is detected, and the amount of fusible powder corresponding to the moving speed is jetted from the central hole of the nozzle. By doing so, the thickness of the marking line can be kept constant. Then, changing the amount of the fusible powder injected from the central hole of the nozzle can be realized by adjusting the flow rate or pressure of the gas.

According to the above marking device, the thickness of the marking line can be kept constant regardless of the change in the moving speed of the nozzle.

That is, the hole formed at the center of the nozzle is connected to the container containing the fusible powder, and the adjusting gas pipe for adjusting the supply amount of the fusible powder and the fusible powder are conveyed to the container. By connecting the carrier gas pipe and adjusting the opening of the adjusting valve provided in each pipe, the amount of the fusible powder injected from the nozzle can be adjusted.

Therefore, by detecting the moving speed of the nozzle by the control device and adjusting the openings of the adjusting gas adjusting valve and the carrier gas adjusting valve according to the detected speed, the moving speed of the nozzle from the center hole of the nozzle. It is possible to inject an appropriate amount of fusible powder corresponding to That is, the marking line having a constant thickness can be formed by adjusting the amount of the fusible powder according to the change in the moving speed of the nozzle.

The marking device exhibits its function by being mounted on a processing device capable of two-dimensionally controlling the moving direction of the nozzle by the NC device. Therefore, the moving speed of the nozzle can be detected by receiving the speed signal from the control unit of the mounted device, for example, the NC device.

[0024]

[Examples] Hereinafter, the marking method will be described.
An embodiment of the marking device will be described with reference to the drawings. FIG. 1 is a diagram illustrating a marking method according to the present invention, FIG. 2 is a schematic diagram illustrating a configuration of a marking device according to the present invention, and FIG. 3 is an N equipped with the marking device according to the present invention.
It is a perspective view of a C cutting device.

First, the schematic construction of the NC cutting device will be described with reference to FIG. The marking device according to the present invention is installed in a processing device controlled by an NC control device, for example, a cutting device or a marking-dedicated device. Hereinafter, an embodiment in which the marking is installed in the cutting device will be described.

In the figure, a frame 2 is mounted on a pair of rails 1 laid in parallel. This frame 2
The traveling motor 3 is provided in the vehicle, and the frame 2 can be caused to travel along the rail 1 by driving the traveling motor 3.

The frame 2 has a cross girder 2a arranged in a direction orthogonal to the laying direction of the rail 1.
A carriage 4 is mounted on the girder 2a. Further, the carriage 4 is provided with a traverse motor 5, and by driving the traverse motor 5, the carriage 4 can be traversed along the cross girder 2a.

A torch 6 such as a gas cutting torch or a plasma cutting torch is attached to the carriage 4.
Further, a marking nozzle 7 for forming a marking line is attached at a position separated from the torch 6 by a predetermined distance.

An NC device 8 is mounted on the frame 2. And the figure A to be marked on the NC device 8 in advance
By inputting the information (see FIG. 1) and driving the traveling motor 3, the traverse motor 5 and the marking device B described later by a command from the device 8, the figure A is drawn on the surface of the material C to be marked. It is possible to mark.

Next, the marking method will be described.
The marking method according to the present invention, when marking a pre-programmed figure A on the surface of a material to be marked such as a steel plate by marking, supplies the fusible powder (for example, zinc powder) according to the moving speed of the nozzle. By changing
The amount of fusible powder required to form a marking line of unit length is kept constant, whereby the thickness of the marking line is kept constant.

As shown in FIG. 1A, when marking a figure A having a contour line from the start point 11 through the points 12 to 15 to the end point 16, the moving speed of the nozzle 7 is between the points. Of the character of the line (straight line, arc) and the condition of the figure A such as the refraction angle at each point, the condition of marking accuracy, etc.
It is set in consideration of each condition such as the weight of the NC cutting device.

For example, when the start points 11 to 12 are connected by a straight line parallel to the rail 1 and the points 12 to 13 are connected by a straight line orthogonal to the rail 1, as shown in FIG. As described above, at the start point 11, the frame 2 rises at a speed that does not generate a large impact, reaches the preset linear marking speed, and maintains the speed.
When the frame 2 approaches the vicinity of the point 12, the frame 2 decelerates in the section set on the upstream side of the point 12 and stops when reaching the point 12. Then, when the frame 2 reaches the point 12, the carriage 4 starts to traverse and rises at a speed that does not generate an impact, and reaches a preset linear marking speed and maintains the speed.

When the points 13 to 14 are connected by a circular arc, the circular arc section is realized by continuous running and traversing of the frame 2 and the carriage 4 on a short straight line. Therefore, the moving speed of the nozzle 7 becomes a value smaller than the linear marking speed.

The supply amount of the fusible powder to the nozzle 7 is set according to the moving speed of the nozzle 7. That is, as shown in FIG. 7C, the supply amount corresponding to the speed when marking the straight line portion of the figure A is maximized, and when the speed is lower than the marking speed, the supply is performed according to the decreased speed. The amount is being reduced. Further, the supply amount of the fusible powder is set to be a substantially constant amount per unit length of the marking line.

Therefore, it is possible to keep the thickness of the marking line formed by thermal spraying of the fusible powder substantially constant, regardless of the fluctuation of the moving speed of the nozzle 7. For this reason, the figure A is formed on the marking target material C by the marking line having a substantially constant thickness, and when the cutting is carried out by using the semi-automatic cutting machine, the product maintaining the shape accuracy is processed. It is possible.

Next, the structure of the marking device is shown in FIG.
Will be described. In the figure, the nozzle 7 is a marking nozzle and is detachably attached to the torch 21. The torch 21 is attached to the carriage 4 of the NC gas cutting device.

A torch 21 is connected to a fuel gas supply hose 23 for forming a flame 22 in the nozzle 7, and an oxygen supply hose 24 for burning the fuel gas. These supply hoses 23, 24 are arranged. The flame 22 suitable for marking can be formed by adjusting the selected needle valves 23a, 24a.

The torch 21 is a container 26 containing a fusible powder 25.
And connected by hose 27. The container 26 is the main body 26
It is composed of a and a lid 26b, and it is possible to fill the fusible powder 25 by removing the lid 26b from the body 26a, and when the lid 26b is attached,
It is possible to seal 26a.

A carrier gas hose 28 and a regulated gas hose 29 are connected to the lid 26b. Each of these gases uses oxygen gas, and the hoses 28 and 29 are connected to an oxygen supply source (not shown) (for example, an oxygen cylinder or factory piping). Carrier gas is mainly fusible powder
25 has the function of transporting 25 from the container 26 to the nozzle 7 and injecting it, and the adjusting gas is the fusible powder 25 stored in the container 26.
Of the fusible powder in the container 26 while stirring and acting on the upper layer of
It has the function of floating 25.

Each hose 28, 29 is provided with a valve 31, 32 for controlling the flow rate or pressure such as a motor valve controlled by the controller 30. The supply amount of the fusible powder 25 to the nozzle 7 according to the opening degree of the valves 31 and 32 is set in advance by experiments or the like. Therefore, the control amounts of the valves 31 and 32 for injecting the desired amount of the fusible powder 25 from the nozzle 7 are preset and stored in the control device 30.

The control device 30 may be provided alone to generate a signal for driving the valves 31 and 32.
It may be incorporated in the C device 8. In this embodiment, the control device
30 is provided separately from the NC device 8.

In the above structure, the information of the figure A to be marked is input to the NC device 8 in advance, and the marking material C is
When a signal indicating that marking should be formed is input to NC,
The traveling motor 3 and the traverse motor 5 are driven according to the program stored in the device 8 to traverse and traverse the frame 2 and the carriage 4 to move the nozzle 7 to the start point 11.

When the nozzle 7 reaches the start point 11,
A flame 22 is formed on the nozzle 7 by an automatic ignition device or a manual operation. When the flame 22 is formed and it is confirmed that the preparation for the marking work is completed, the NC device 8 generates a drive signal corresponding to the information of the contour line of the figure A to the traveling motor 3 and the traverse motor 5, and A speed signal based on the drive signal is transmitted to the control device 30. Controller 30
Then, at the same time as the transmission and reception of the speed signal, a drive signal based on the speed signal is generated for the valves 31 and 32.
Adjust 1, 32 to the specified opening.

The container 26 is supplied with a carrier gas and a regulated gas having a flow rate or pressure according to the opening degrees of the valves 31 and 32, and the amount of the fusible powder is adjusted according to the flow rate or pressure of the regulated gas.
25 floats and is carried to the nozzle 7 by the carrier gas.
The fusible powder 25 transferred to the nozzle 7 is
The material to be marked C
Is sprayed on. As a result, a marking line is formed on the surface of the material C to be marked.

The openings of the valves 31, 32 are adjusted according to the speed signal transmitted from the NC device 8 to the control device 30. Therefore, the valves 31 and 32 are controlled following the acceleration and deceleration in the NC cutting device, as shown in FIG. 1C, and the amount of the fusible powder 25 supplied to the nozzle 7 is increased. Is set according to the change in speed of the NC cutting device. Therefore, N
It is possible to keep the thickness of the marking line substantially constant regardless of the speed of the C cutting device.

[0046]

As described in detail above, in the marking method according to the present invention, the thickness of the marking line can be made substantially uniform by adjusting the amount of the fusible powder mixed in the gas according to the moving speed of the nozzle. It can be kept constant.

Further, in the marking device according to the present invention, the movement of the nozzle is detected by detecting the moving speed of the nozzle and adjusting the flow rate or pressure of the carrier gas and the adjusting gas supplied to the container containing the fusible powder. The amount of fusible powder can be adjusted according to the variation in speed. Therefore, it has a feature that the thickness of the marking line can be kept substantially constant.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a marking method according to the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a marking device according to the present invention.

FIG. 3 is a perspective view of an NC cutting device equipped with the marking device of the present invention.

FIG. 4 is a diagram illustrating a problem.

[Explanation of symbols]

A figure B
Marking device C Marked material 2
Frame 3 Travel motor 4
Carriage 5 Traverse motor 6,21
Torch 7 nozzle 8
NC device 11 Start point 12 to 15
Point 16 End point 22
Flame 23,24 Supply hose 25
Fusible powder 26 Containers 27, 28, 29
Hose 30 Control device 31, 32
valve

Claims (2)

[Claims] 1. A material to be marked is formed by injecting a gas mixed with fusible powder from a hole formed in the center of a nozzle and forming a flame in the hole formed around the hole to melt the fusible powder. A marking method when a marking device that moves and draws a nozzle while spraying on a processing device that is controlled by a numerical control device is installed, in which fusible powder of fusible powder mixed in a gas is mixed according to the moving speed of the nozzle. A marking method characterized by adjusting the amount. 2. A nozzle mounted on a processing device controlled by a numerical control device, having a hole formed in the center for injecting a gas mixed with fusible powder and a hole forming a flame around the hole. And a carrier gas supply hole that is connected to a hole formed in the center of the nozzle and that stores the fusible powder therein, and that conveys the fusible powder, and an adjustment gas supply that adjusts the supply amount of the fusible powder. A carrier gas supply pipe having a container formed with a hole, a carrier gas supply hole of the container and a carrier gas supply source, and a carrier gas adjusting valve for adjusting a flow rate or a pressure of the carrier gas, and an adjusting gas supply of the container. Adjusting gas supply pipe having an adjusting gas adjusting valve for connecting the hole and the adjusting gas supply source and adjusting the flow rate or pressure of the adjusting gas, and the carrier gas adjusting valve and / or adjusting gas adjusting by detecting the moving speed of the nozzle Valve A marking device having a control device for controlling.