JP3320955B2 - Steel plate marking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for manufacturing a semiconductor device which is 300 ° C.
The present invention relates to a steel sheet marking apparatus for marking a steel sheet or the like having a temperature range of 1 according to an air atomizing method.

[0002]

2. Description of the Related Art In general, marking on a steel plate or the like is a display of a required specification of a customer, and is used as a key for identifying an actual product in a refinement processing line after a shearing line in a factory. It is required to display clear and precise characters. Further, since it is installed on the shearing main line directly connected to the rolling line, it must be a device having high equipment reliability in order to secure production processing and capable of processing all of the passing material with high efficiency.

FIG. 6 is a schematic configuration diagram of a conventional steel sheet marking apparatus. At the time of marking, the needle valve 40 is opened and the pressurized paint is applied to the double pipe nozzle with a diameter of 0.5 mm.
At the same time as discharging from the paint nozzle 41, pressurized air is also discharged from the air nozzle 42 having a diameter of 0.5 mm, and the paint and air are mixed to make the paint into a fine mist state with a fine particle diameter. A so-called air atomizing type marking is performed to form a marking dot coating 44 having a specified dot diameter by spraying.

FIG. 7 is a view showing a conventional two-fluid spray nozzle, and FIG. 7A is an enlarged view of a nozzle tip portion.
(B) is a sectional view of the tip of the nosol. In this case, for example, as shown in FIG. 7B, after paint is discharged from a paint nosol 50 having a diameter of 0.4 mm and marked on a steel plate, a diameter of φ0. 4m
The cleaning liquid is ejected from the cleaning liquid nozzle 51 of m to clean the nozzle.

In the case of the example shown in FIG. 6, since the air atomizing method is employed and the coating material is a water-soluble coating material having a high boiling point of 100 ° C., it can cover the entire temperature range from normal temperature to high temperature. The diameter of the nozzle is as large as φ0.5 mm to prevent nozzle clogging due to the water-soluble paint.

On the other hand, in the case of the example shown in FIG. 7, since the paint is an airless type and uses an organic material having a boiling point of 60 ° C.,
Although it is possible to cope with the temperature from normal temperature to 100 ° C., in the case of a high-temperature steel plate of higher temperature, the paint evaporates and cannot be marked in a powdery form without being placed on the steel plate.

[0007]

However, in the above-mentioned conventional example, since the tip of the marking nozzle and the tip of the paint nozzle 41 are flush with each other as shown in FIG. 6, for example, paint and air are mixed outside the nozzle. Therefore, the air spreads and diffuses before reaching the surface 43 to be marked, and the dot diameter shown as the marking dot coating 44 becomes φ10.
mm, the dot diameter of the marking is small and it is impossible to make a clear and constant marking.Therefore, if the nozzle diameter is reduced to reduce the dot diameter, nozzle clogging will occur. There is.

In the case of FIG. 7, since the water-soluble paint which is slow in drying at the time of normal-temperature printing and which easily causes nozzle clogging is replaced by an organic paint, the nozzle diameter can be reduced to φ0.4 mm. However, there is a problem that the coating material has a low boiling point and cannot be used for high-temperature materials of 100 ° C. or more for airless printing.

Accordingly, an object of the present invention is to keep the dot diameter at the time of marking constant without causing nozzle clogging, and to always provide clear marking over the entire temperature range from room temperature to 300 ° C. To provide a steel sheet marking device.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method for controlling the temperature of a semiconductor device from room temperature to 30 minutes.
In a steel sheet marking device that performs marking on steel sheets, etc. in a temperature range of 0 ° C by the air atomizing method, the dot diameter at the time of marking is kept constant to prevent nozzle clogging, and the entire temperature range from room temperature to 300 ° C This is a steel plate marking device that always enables clear marking.

The gist of the present invention is as follows. According to the first aspect of the present invention, a dot having a diameter of 4 mm is held by an air atomizing method using a double-tube nozzle and the temperature is reduced from room temperature to 30%.
In a marking device for marking a steel sheet up to 0 ° C., a double pipe nozzle having a paint discharge nozzle shorter than a nozzle tip by a distance of a nozzle tip, and a paint in the outer peripheral portion from the paint discharge nozzle of the double pipe nozzle. An ejection switching control means for switching the ejection of the washing liquid and the air after ejecting and mixing air from the washing liquid ejection nozzle to perform marking on the surface to be marked.

[0012] Then, the nozzle tip length of the double tube nozzle by considering nozzle clogging, the plate temperature 0.99 ° C., the paint pressure 10 Kg / cm ^2, the conditions of air pressure of 4 Kg / cm ² and the nozzle tip and the plates distance 15mm 0.5m below
m to 1.0 mm.

Further, the paint discharge nozzle and the air
The nozzle diameter of both of the cleaning liquid discharge nozzles is φ0.2 mm.

[0014] The invention of claim 2, claim 1
The marking is performed by controlling the particle size of the paint sprayed from the tip of the nozzle according to the temperature of the material to be marked.

[0015]

According to the embodiment of the present invention, the paint discharge nozzle retracted about the nozzle tip distance 0.5~1.0mm from noise tip, a 0.2mm nozzle diameter to the paint discharge nozzle and air cleaning liquid discharge nozzle co Using a double tube nozzle with a thin structure, the discharge switching control means, after marking to mix and spray paint and air, discharge the cleaning liquid from the air / cleaning liquid discharge nozzle to wash, and then immediately before the next marking Ejection switching control that switches to air ejection eliminates nozzle clogging and printing defects, while reducing the nozzle diameter and spraying paint and air after mixing in the nozzle to keep marking dots at φ4 mm. Clear marking can be performed from room temperature to 300 ° C.

In addition, since the particle size of the paint sprayed from the tip of the nozzle is controlled so as to be changed according to the temperature of the material to be marked, the paint is not repelled into powder even when the steel sheet temperature becomes high, and the dot diameter can be reduced. Clear marking can be performed while maintaining the diameter at 4 mm.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a steel sheet marking apparatus according to a first embodiment of the present invention. FIG. 2 is an enlarged view of the tip of the double tube nozzle shown in FIG. FIG. 3 is a sectional view of the tip of the double tube nozzle shown in FIG.

In FIG. 1, 1 is an air compressor for compressing air, 2 is a pressure regulating valve for air, 3 is a solenoid valve for ON / OFF of air, 4 is a compressor for paint,
5 is a paint pressure control valve, 6 is a paint ON / OFF solenoid valve, 7 is a cleaning fluid compressor, 8 is a cleaning fluid pressure control valve, 9 is a cleaning fluid ON / OFF solenoid valve, and 10 is the temperature of the running steel plate. Numeral 11 is a double tube nozzle having a paint discharge nozzle at the center and an air / cleaning liquid discharge nozzle arranged at the outer periphery thereof for performing marking by the air atomizing method. Numeral 12 denotes a discharge switching control means comprising a controller for inputting the measured values of the radiation thermometer 10, setting the paint and air pressure, and controlling the discharge timing of paint and air and other controls.

In the double tube nozzle 11 shown in FIG. 2, the paint discharge nozzle 21 is formed so as to be retracted from the nozzle tip 22 by a nozzle tip distance L. An air / cleaning liquid discharge nozzle 23 is disposed on the outer periphery of the paint discharge nozzle 21, a cleaning liquid hole 24 for supplying a cleaning liquid is provided above the nozzle 23, and a paint supply for supplying a paint to the paint discharge nozzle 21 is provided above the paint discharge nozzle 21. A hole 25 is provided.

The positional relationship between the paint discharge nozzle 21 and the air / cleaning liquid discharge nozzle 23 is concentrically arranged as shown in FIG. 3, and the nozzle diameter of both nozzles is φ0.2 mm, which is less than half the conventional example. ing.

Next, the operation will be described with reference to the drawings.

When performing marking on a running steel plate or the like by an air atomizing method, an air (air) system compresses air with an air compressor 1 and adjusts and sets a pressure with a pressure adjusting valve 2 to set an air / washing liquid discharge nozzle. 23.

On the other hand, in the paint system, the paint compressed by the paint compressor 4 is supplied to the paint discharge nozzle 21 after the pressure is adjusted and set by the pressure regulating valve 5.

In this case, the paint pressure and the air pressure to be set are controlled by the temperature of the steel sheet. For example, the controller 12 inputs the measured value of the radiation thermometer 10 and, when the steel sheet temperature is high, the paint discharge pressure. Control such as raising the air discharge pressure. In addition, the distance between the nozzle tip and the steel plate is also adjusted according to the steel plate temperature, and the distance between the nozzle tip and the steel plate is controlled to be shorter as the temperature becomes higher.

The paint compressed to the set value in this manner is discharged from a paint discharge nozzle 21 arranged to be retracted by the nozzle tip distance L, and the compressed air is discharged from an air / cleaning liquid discharge nozzle 23, and the inside of the nozzle is discharged. And a dot spray method marking is performed on the steel plate as a prescribed dot of φ4 mm. Subsequently, a cleaning liquid hole 24 described later is used.
A series of discharge switching control such as nozzle cleaning for supplying a cleaning liquid from the nozzle and air discharge performed immediately before the next marking is performed.

FIG. 4 is a diagram showing the relationship between the nozzle tip distance and the dot diameter.

Here, referring to FIG.
A method of obtaining the nozzle tip distance L in No. 1 will be described. In FIG. 4, the vertical axis represents the dot diameter (mm) as a dot spray printing unit, and the horizontal axis represents the nozzle tip distance L.
Taking (mm), as operating conditions at that time, the steel sheet temperature: 0.99 ° C. Paint pressure: 10 Kg / cm ² Air pressure: 4 Kg / cm ² nozzle tip and the steel plate distance: optimum nozzle tip distance under the conditions of 15 mm L It is what was asked.

In FIG. 4, the curve A is a characteristic curve plotting the relationship between the dot diameter and the nozzle tip distance L.
In the vicinity of the nozzle tip distance L = 0, that is, in a range where there is no difference between the nozzle tip 22 and the paint discharge nozzle, the paint and the air are mixed outside the nozzle, the air is diffused, and the dot diameter becomes larger than 8 mm. I have. Further, the paint discharge nozzle 21 is retracted from the nozzle tip 22. When the nozzle tip distance L reaches 0.5 mm, the paint and the air are mixed in the nozzle 11, and the nozzle diameter becomes φ.
Combined with the diffusion suppression effect of 0.2mm, the spread of air is suppressed, and the dot diameter is the specified φ4mm.
, And clear marking by the air atomizing method without printing defects such as bleeding can be performed.

As shown by the curve A, if the nozzle tip distance L is set to 0.5 mm or more, the dot diameter is maintained at the specified φ4 mm, but in addition, it is necessary to consider nozzle clogging. The curve B in the figure is a nozzle clogging frequency curve.
Nozzle tip distance L = 0.5 to 1.0 mm that is optimal from the curve
Can be determined.

Referring again to FIG. 1, the discharge switching control by the discharge switching control means 12 will be described.

As described above, the compressed paint and compressed air are supplied to the double pipe nozzle 11 from the respective compression regulating valves 2 and 5, and the paint discharge nozzle 21 and the air / washing liquid discharge nozzle 2 are supplied.
The mixture is discharged from No. 3 and mixed in a nozzle, and marking of letters, numbers, symbols, etc. is performed on a steel plate as dots of prescribed φ4 mm by a dot spray method.

When the marking on the steel plate is completed, the supply of the paint and the air is stopped by turning off the solenoid valves 3 and 6, and the cleaning liquid is supplied to the air / cleaning liquid discharge nozzle 23 by turning on the solenoid valve 9. The double tube nozzle 11 is cleaned to prevent nozzle clogging and prepare for the next steel plate marking.

When a predetermined cleaning time has elapsed, the supply of the cleaning liquid is stopped by turning off the electromagnetic valve 9, and the electromagnetic valve 3 is turned on for a predetermined time immediately before marking the next steel sheet, and air is supplied to the double pipe nozzle 11. Supply and blow off residual cleaning liquid and residual paint to clean.

After the cleaning of the double-tube nozzle 11, the solenoid valve 6 is also turned on, and the compressed paint and the compressed air are supplied to the nozzle 11 to mark the next steel sheet in the same manner as at the beginning.

The processing procedure of the above-described discharge switching control means 12 is briefly summarized as follows. Process 1, air / paint discharge mixing, spraying.

Processing 2, cleaning liquid discharge.

Process 3, air ejection just before the next marking.

Process 4: Air / paint discharge mixing and spraying for the next marking. Becomes In this embodiment, since an organic coating material having a boiling point of 60 ° C. is used, airless printing is performed from room temperature to 90 ° C., and air atomizing printing is performed in a range of 90 to 300 ° C., so that the printing is more efficient and clear. Marking can be performed.

Further, at the time of cleaning, the nozzle tip has a space corresponding to the nozzle tip distance L, so that the surface tension of the cleaning liquid acts more strongly, so that the cleaning liquid stays for a longer time. The nozzle can be prevented from being clogged due to the dry coating of paint, and air can be blown out immediately before the next marking to wipe out these stagnation, eliminating the adverse effect on the marking, thus enabling clear marking.

Next, a second embodiment of the present invention will be described.

FIG. 5 is a view showing the relationship between the steel sheet temperature and the paint particle size of the steel sheet marking apparatus according to the second embodiment of the present invention.

In the second embodiment, the nozzle 1
The size of the particle size of the mist paint (or paint) sprayed from 1 is controlled. In the case of air atomization printing, as the temperature of the steel sheet increases, if the particle size of the paint (measured when the steel sheet is in contact with the steel sheet) is large, the degree of evaporation will be high and the degree to which the coating will not be applied to the steel sheet will increase, making marking impossible. Therefore, it is necessary to reduce the particle size of the paint as the steel sheet temperature increases, and to control so that the dot diameter φ4 mm of the marking unit can be maintained.

To reduce the particle size of the paint, a technique such as increasing the air pressure is used.
Taking the particle size, taking the steel sheet temperature on the horizontal axis, the optimum paint particle size for the temperature was empirically determined by actual measurement,
As a result, the optimal paint particle size is as follows: Steel plate temperature Paint particle size (organic) Room temperature to 90 ° C φ4mm 90 to 130 ° C φ2.0 to 2.5mm 130 to 170 ° C φ1.5 to 2.0mm 170 to 200 ° C φ1. 0 to 1.5 mm 200 to 300 ° C φ0.5 to 1.0 mm

Finally, an air atomizing printing method using the double-tube nozzle 11 as described above was used to obtain a dot diameter φ4 mm.
Dot spacing 5mm, steel sheet speed up to 60mpm, steel sheet temperature range from normal temperature to 300 ℃, show actual measured values of paint discharge pressure, air discharge pressure, distance between nozzle and steel plate, paint particle size, which are optimal for clear marking. The results are shown in Table 1.

As described above, in the present invention, a double tube nozzle having a nozzle tip distance L is used, and an organic paint is used to control discharge switching, paint particle size control by steel plate temperature, and airless printing by steel plate temperature range. By controlling the switching of air atomizing printing and the like, clear printing can be performed on steel sheets in a wide temperature range from room temperature to 300 ° C. In addition, other print aptitude conditions (air discharge pressure, paint discharge pressure, nozzle
The distance between steel sheets, etc.) was also established.

Further, the automatic running printing on the defective material is made possible and the hand blowing operation is eliminated, and the pitch of the marking process can be shortened by the automatic table transfer and the running running marking.

[0047]

[Table 1]

[0048]

As described above, claims 1 and 3
According to the invention described in (1), the paint discharge nozzle is formed so as to be retracted from the tip of the nozzle by about 0.5 to 1.0 mm from the tip of the nozzle, and the paint discharge nozzle and the air / washing liquid discharge nozzle are set to φ.
After performing marking by air atomizing printing using a double tube nozzle thinned to 0.2 mm, a cleaning liquid is discharged and washed, and discharge switching control means for switching to air discharging immediately before the next marking is provided. As a result, nozzle clogging and printing defects are eliminated, and the dot diameter for marking is φ
By keeping the distance at 4 mm, clear marking can always be performed over the entire temperature range from room temperature to 300 ° C.

According to the fourth aspect of the present invention, in addition to the above, the particle size of the paint sprayed from the nozzle tip is controlled so as to be changed according to the temperature of the steel sheet. Clear marking can be performed while maintaining the diameter at φ4 mm.

[Brief description of the drawings]

FIG. 1 is a block diagram of a steel plate marking apparatus according to one embodiment of the present invention.

FIG. 2 is an enlarged view of a tip portion of the double tube nozzle shown in FIG.

FIG. 3 is a cross-sectional view of the tip of the double tube nozzle shown in FIG.

FIG. 4 is a diagram showing a relationship between a nozzle tip distance and a dot diameter of the double tube nozzle shown in FIG.

FIG. 5 is a diagram illustrating a relationship between a steel sheet temperature and a paint particle size in a steel sheet marking apparatus according to a second embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a conventional steel plate marking apparatus.

FIG. 7 is a view showing a conventional two-fluid spray nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air compressor 2 Air pressure control valve 3,6,9 Solenoid valve 4 Paint compressor 5 Paint pressure control valve 7 Cleaning liquid compressor 8 Cleaning liquid pressure control valve 10 Radiation thermometer 11 Double pipe nozzle 12 Discharge switching control means 21 Paint Discharge Nozzle 22 Nozzle Tip 23 Air / Cleaning Solution Discharge Nozzle 24 Cleaning Solution Hole 25 Paint (Paint) Supply Hole L Nozzle Tip Distance

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-48057 (JP, A) JP-A 60-115577 (JP, U) JP-A 61-19457 (JP, U) JP-A 52- 14360 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 7/06 B05B 15/02

Claims (2)

(57) [Claims] 1. Using a double tube nozzle, hold a dot of φ4 mm by an air atomizing method, and maintain the dot from normal temperature to 300 ° C.
In a marking apparatus for marking steel plates up to a target, a paint discharge nozzle shorter than a nozzle tip by a nozzle tip distance is provided, and the nozzle tip distance is set to a plate temperature of 150.
° C, paint pressure 10Kg / cm ² , air pressure 4Kg / c
All the conditions of m ² and the nozzle tip and the plates distance 15mm
0.5 mm to 1.0 mm, and the paint discharge
Nozzle diameter is φ for both nozzle and air / cleaning liquid discharge nozzle
A double tube nozzle that is 0.2 mm;
Discharges paint and air from the paint discharge nozzle
Air is discharged from the nozzle and mixed to reach the surface to be marked
After performing marking, discharge the cleaning liquid and air.
Discharge switching control means for performing switching is provided.
Steel sheet marking device. 2. The steel sheet marking device according to claim 1,
From the nozzle tip depending on the temperature of the material to be marked.
Specially designed for marking by controlling the particle size of the paint to be sprayed.
Marking equipment for steel plate.