JP2002195555A - Flame processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put the wettability of a work in a uniform and suitable state by making a stable flame by simple means in a flame processing method. SOLUTION: In a flame processing method which heat-treats the surface of a work by the flame of a flame burner 104, the temperature distribution of the flame is measured by a temperature distribution means 12 for measuring the temperature distribution, and the state of the flame is regulated, using a regulation means for regulating the state of the flame by the temperature distribution of the flame. The above temperature distribution measuring means 12 uses an infrared ray camera. Moreover, the above regulation means is one which regulates at least one among the fuel supply state of the flame burner, the air supply state of the flame burner, and the oxygen concentration of the flame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame treatment method for heating a surface of an object to be treated with a flame of a flame burner, and more particularly to a flame treatment method for adjusting a state of a flame to a state suitable for the flame treatment.

[0002]

2. Description of the Related Art Vehicle bumpers and instrument panels (Instrument P)
Anel) is often made of resin products. These resin products are often subjected to coating and bonding treatments.

Conventionally, when a coating agent such as a paint or an adhesive is applied to these resin products (including coating, thermal spraying, crystal formation, etc.), a flame such as a gas burner is applied to the resin product so that the coating agent does not peel off. Has been preliminarily subjected to heat treatment.
By performing the heat treatment, the wettability of the surface of the resin product is improved, so that the adhesiveness is increased and the coating agent is hardly peeled off.

The improvement in wettability is affected by the oxygen concentration of the flame in the heat treatment, and a flame treatment method for stabilizing the flame while controlling the oxygen concentration is known (for example, Japanese Unexamined Patent Publication No. No. 11-28415).

[0005]

However, in the prior art, since only the oxygen concentration of the flame is controlled, it is not always possible to obtain a suitable wettability of the object to be treated. That is, as a factor affecting the wettability, it is considered that the temperature of the flame is greatly affected in addition to the concentration of oxygen, but the conventional technique does not control the temperature of the flame. The reason is that if the flame temperature can be adjusted in addition to the oxygen concentration, it is considered that suitable wettability can be obtained uniformly, but there are many factors that determine the flame temperature,
It is difficult to measure and adjust them all.

In other words, the adjustment value must be changed depending on the type of LPG (propane gas) and LNG (liquefied natural gas) as the fuel, and also consider the case where the components of the same type of fuel vary in the components. There must be. Further, it is considered that the fuel temperature, the pressure and flow rate of the supplied air, the air temperature, the atmospheric pressure, the humidity, the temperature of the equipment, and the like also affect the wettability, and it is very difficult to adjust all of these factors.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is an object of the present invention to provide a method for producing a stable flame by a simple means in a flame treatment method, and to make the work wettability uniform and suitable. Aim.

[0008]

A flame treatment method according to the present invention is a method for flame treatment of a surface of an object to be treated by flame of a flame burner. Measuring the temperature distribution;
Comparing the temperature distribution of the flame with a prescribed temperature distribution, judging whether or not it is necessary to adjust the state of the flame by using an adjusting means for adjusting the state of the flame, if adjustment is necessary, The method includes a step of adjusting the state of the flame using an adjusting unit, and a step of performing a flame treatment on the surface of the object to be processed by the flame.

By doing so, a stable flame can be created by simple means, and the wettability of the work can be made uniform and suitable.

[0010] The temperature distribution measuring means may be an infrared camera.

Further, the adjusting means may be an adjusting means for adjusting at least one of a fuel supply state of the flame burner, an air supply state of the flame burner, and an oxygen concentration of the flame.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flame treatment method according to the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the flame treatment apparatus 10 according to the present embodiment includes an air supply source 118 for supplying air, an air supply path 110 connected to the air supply source 118, and A gas supply source 120 for supplying a fuel gas, a fuel gas supply path 112 connected to the gas supply source 120,
A mixing ratio adjusting valve 114 provided in a pipe of the fuel gas supply path 112, an air supply path 110, and a fuel gas supply path 11;
2, a gas mixer 102 that mixes air and fuel gas to form a mixed gas, and a pipe 11 that is a supply path of the mixed gas.
6 and a flame burner 104 connected to the line 116 for burning the mixed gas.

The flame burner 104 performs a flame treatment by blowing out a flame 106 obtained by burning the mixed gas to a work (object to be processed) 108. Further, the flame burner 104 is gripped by a robot (not shown), and can move and heat the work 108 while maintaining a certain distance from the work 108 by the operation of the robot.

The oxygen concentration of the flame 106 is controlled so as to be maintained at a suitable value by adjusting the mixing ratio adjusting valve 114.

Further, the pipe 1 branched from the pipe 116
8 is connected to the oxygen concentration detector 24. The oxygen concentration detector 24 guides the mixed gas through the pipe 18 and burns it to produce a relatively small flame 24b. The flame 24b is used as a sample for detecting the oxygen concentration of the flame instead of the flame 106. The main body 24a of the oxygen concentration detector 24 detects the oxygen concentration of the flame 24b with an oxygen concentration detection sensor (not shown), and adjusts the mixing ratio adjusting valve 1 so that the oxygen concentration becomes a preset concentration.
The control signal 20 is sent to the CPU 14 to control the oxygen concentration.

The gas supply source 120 and the inlet side of the first gas control knob 22a are connected by a conduit 26a. A pipe 26b is connected between the outlet side of the first gas control knob 22a and the inlet side of the mixing ratio control valve 114. Also, the pipe 26 branched from the middle of the pipe 26b.
c is connected to the inlet side of the second gas control knob 22b. Line 2 is located on the outlet side of the second gas control knob 22b.
6d is connected, and a pipe line 26e is connected to the outlet side of the mixing ratio adjusting valve 114. And this pipe 26d
Is joined to the gas inlet of the gas mixer 102.

Infrared camera (temperature distribution measuring means) 12
Is an apparatus capable of detecting infrared light emitted from the surface of an object and measuring the surface temperature. The temperature distribution of the flame 106 is measured using the infrared camera 12. The image signal, which is the result of measuring the flame 106, is
And is displayed as an image 16a on the display 16.

First, an operator operating the flame treatment apparatus 10 prepares the flame 106 and the flame 24b by burning the mixed gas.

Then, the oxygen concentration detector 24 and the like are set to adjust the fuel gas flow rate, the air flow rate, and the oxygen concentration to the initial values.

In this state, the flame 106 is in a somewhat suitable state. However, as described above, the flame 106 is affected by the type of fuel, the variation of the fuel component, the fuel temperature, the pressure and flow rate of the supplied air, the temperature, the atmospheric pressure, the humidity, and the temperature of the equipment. Further adjustments are needed to do so.

The effect of these factors is that flame 1
06, the temperature distribution of the flame 106 may be directly examined and adjusted. Therefore, the flame 106 is photographed by the infrared camera 12 and the image 16 a is displayed on the display 16. The operator observes this image 16a while watching the first and second gas adjustment knobs 2.
The gas flow rate is adjusted by 2a, 22b or the like, and the setting of the oxygen concentration of the oxygen concentration detector 24 is adjusted. Thus,
The flame 106 can be brought into an optimum state in the flame treatment. Further, the air flow rate may be adjusted by an air flow rate controller (not shown).

This adjustment step is performed in a preparation stage of the flame treatment. In addition, the adjustment may not be performed every time, but may be performed once before the start of work in the morning and afternoon, or once a day, for example.

Here, an example of the image 16a of the flame 106 is shown in FIGS. These image examples are obtained at the stage of adjusting the flame 106, and show that the state of the flame 106 is changed by the adjustment.

3 to 11, the temperature range 50 indicates a range of about 900 ° C. or higher. The temperature range 52 is in a range of about 850 ° C. to 900 ° C., the temperature range 54 is in a range of about 800 ° C. to 850 ° C., and the temperature range 56 is about 7
A range of 00 ° C. to 800 ° C. and a temperature range 58 represent a range of 700 ° C. or less.

Actually, on the display 16, the temperature range 50 is red, the temperature range 52 is yellow, and the temperature range 5
4 is yellow-green, the temperature range 56 is green, and the temperature range 58 is blue. Intermediate colors are used and displayed in continuous color changes.
In addition, the higher the temperature, the warmer the color is, so the state of the flame 106 can be intuitively determined.

These temperature ranges 50, 52, 54, 5
The temperature range 56 is a stable flame among 6, 58, and is suitable for flame treatment. Therefore, the longer the temperature range 56 is, the better.

FIG. 3 shows the flame 106 in a state suitable for flame treatment.
It is an example of an image. In this image, the portion of the temperature range 56 is long, and the portion of the temperature range 50 that is unstable at high temperatures is relatively small. Therefore, when the flame 106 is adjusted, it is preferable that the state shown in FIG.

FIGS. 4 to 11 show examples which are not suitable for the flame treatment as compared with FIG. The reason is briefly described below.

The example of the image shown in FIG. 4 is not suitable because the temperature range 52 of the flame which is unstable at high temperatures is long.

The example of the image shown in FIG. 5 is unsuitable for the temperature range 52 because it is shorter than the example of FIG.

The image example shown in FIG. 6 is unsuitable for the temperature range 52 because it is shorter than the example shown in FIG.

The image example shown in FIG. 7 has a short temperature range 52, but is unsuitable because the stable flame temperature range 56 is sparse.

The image example shown in FIG. 8 has almost no temperature range 52, but is unsuitable because the temperature range 56 is short.

The image example shown in FIG. 9 is unsuitable for the temperature range 56 because it is longer than the example shown in FIG.

The image example shown in FIG. 10 is unsuitable for the temperature range 56 because it is longer than the example shown in FIG.

The example of the image shown in FIG. 11 is unsuitable for the temperature range 56 because it is longer than the example of FIG.

Note that the flame treatment method according to the present invention is not limited to the above-described embodiment, but may employ various configurations without departing from the gist of the present invention.

[0039]

As described above, according to the flame treatment method of the present invention, it is possible to achieve the effect of producing a stable flame by simple means without being affected by conditions such as fuel component variation. Furthermore, the effect of making the wettability of the work uniform and suitable is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a flame processing apparatus according to an embodiment.

FIG. 2 is a diagram illustrating a flame treatment device according to the present embodiment.

FIG. 3 is a diagram showing an example of a flame suitable for flame processing.

FIG. 4 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 5 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 6 is a diagram illustrating an example of an unsuitable flame in flame processing.

FIG. 7 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 8 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 9 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 10 is a diagram showing an example of an unsuitable flame in the flame processing.

FIG. 11 is a diagram showing an example of an unsuitable flame in the flame processing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Flame treatment apparatus 12 ... Infrared camera 16 ... Display 24 ... Oxygen concentration detector 104 ... Flame burner 106 ... Flame 108 ... Workpiece (workpiece) 114 ... Mixing ratio adjustment valve

Claims (3)

[Claims] 1. A method of performing a flame treatment on a surface of an object to be treated by a flame of a flame burner, wherein a step of measuring a temperature distribution of the flame by temperature distribution measuring means for measuring a temperature distribution; And a prescribed temperature distribution, and determines whether or not it is necessary to adjust the state of the flame using an adjusting means for adjusting the state of the flame, and when adjustment is necessary, using the adjusting means. A flame treatment method, comprising: adjusting a state of a flame; and flame-treating a surface of an object to be treated with the flame. 2. A flame processing method according to claim 1, wherein said temperature distribution measuring means is an infrared camera. 3. The flame processing method according to claim 1, wherein the adjusting means adjusts at least one of a fuel supply state of the flame burner, an air supply state of the flame burner, and an oxygen concentration of the flame. A flame treatment method, characterized in that the flame treatment method is an adjusting means.