JPH0611430B2 - Coating method for ultra-thick coated steel sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention conveys at least one of a coating target material and coating means in the y direction, and at least one of the coating target material and coating means in the x direction. The present invention relates to a coating method in which a relatively wide surface of a material to be coated is scan-coated with a uniform thickness by reciprocating scanning drive.

[Conventional technology]

For example, in coating a steel sheet, in Japanese Patent Laid-Open No. 62-160163, one coating spray gun is reciprocally scanned in the x direction while the steel sheet is moved in the y direction, and the surface of the steel sheet is 30 μm in one reciprocating scan. It is disclosed to apply a degree of painting. According to this method, the coating is performed once for each of the forward scanning and the backward scanning, so that one reciprocating scanning coating is performed twice. About 15 μm for the forward scanning and 15 μm for the backward scanning.
It is estimated that some degree of painting will be performed. In order to obtain a uniform coating, the y-direction edges of the coating widths of the adjacent forward scans on the steel plate surface are in close contact with each other, and
It is necessary that the y-direction end edges of the adjacent widths of the backward scans in the y-direction be in close contact with each other. That is, for example, as shown in FIG. 5a, in reciprocal scanning coating having a width L in the x direction, the y-direction end edges (dotted diagonal lines) of the adjacent coating widths d in the y direction are in close contact with each other, In addition, it is necessary that the y-direction coating widths d of the adjacent backward scans are exactly in contact with each other in the y-direction edge (solid line diagonal line). The condition for this is Vs =
(D / 2L) · Vn, Vs is the transfer speed of the steel sheet in the y direction, and Vn is the scanning speed of the coating spray gun in the x direction.

Width d that can be coated with a uniform thickness with one spray gun for painting
And since there is a limit to the coating thickness, increase the coating speed,
And / or, in order to increase the coating thickness, it is preferable to arrange a plurality of coating spray guns in parallel and to drive them simultaneously for scanning. For example, by adding another (second) coating spray gun to the coating spray gun 16 ₁ shown in FIG. 5a in the y direction side by side and simultaneously driving them in the x direction, It is possible to apply a coating having a double coating thickness (4 coatings) at the same speed as the coating speed using a spray gun (transporting speed Vs in the y direction).

On the other hand, if a large amount of paint is sprayed at a time with one spray gun to obtain a large coating thickness at one time, the uniformity of the coating thickness is low (uneven coating unevenness) and the peeling resistance of the coating film is low.
If spraying a small amount of paint at one time and repeating it several times to achieve the required thickness, the uniformity of the coating thickness will be high (uneven coating unevenness) and the peeling resistance will be high. It is preferred to provide a relatively small amount of paint spray on each of the.

[Problems to be Solved by the Invention]

However, in the scanning coating using one spray gun (for example, FIG. 5a), in the coating width d in the y direction of each adjacent forward scan, the boundary portion (dotted diagonal line) where the y direction end edges contact each other, and each adjacent Of the coating width d in the y direction of the backward scan,
Microscopically, the boundary portion (solid diagonal line) where the edges in the y direction contact each other has overlapping (double) paints in adjacent scans, and the paint thickness is inside the width d at the edges of each paint width d. Since the thickness gradually decreases from the outside to the outside, the coating thickness is small when the overlap is small, and the coating thickness is thick when the overlap is large, and to some extent, the boundary portion (dotted line and solid line shown in Fig. 5a)
Is a streak whose thickness is thicker or thinner than other positions (boundary streak: double streak).

Therefore, when a plurality of spray guns are arranged in parallel and they are simultaneously driven to scan, for example, the first spray gun 16
₁ and the y-direction of the sequence length of the second spray gun (16 ₂₎ (P) is an integer multiple of the y-direction intermediate the width d of one of the spray gun, the first spray gun 16 ₁ boundary stripes (double streaks) and a second spray gun (16 second boundary _streaks) (double streak) and overlap quadruple overlap (quadruple streaks), and the thickness deviation of the boundary stripe is doubled in the case of a double stripe, Quadruple lines with large thickness deviations are distributed at a pitch d / 2 in the y direction passing through the midpoint of the coating width L in the X direction.

(In FIG. 5a, the dotted line and the solid line are quadruple stripes), and due to such a relatively large coating thickness deviation, the peeling resistance of the coating film becomes low.

An object of the present invention is to provide a coating method capable of uniformly obtaining a coating film having a relatively large number of coatings.

[Means for Solving the Problems]

According to the present invention, at least one of the material to be coated and the coating means for coating the surface of the material to be coated with a predetermined width d in the y direction is transferred in the y direction to the other while the material to be coated is transferred. And a coating method in which at least one of the coating means is reciprocally scanned with respect to the other in the x direction orthogonal to the y direction to scan-coat the material to be coated: each coats a predetermined width d in the y direction. A plurality of coating means are arranged at a pitch P in the y direction, Vs = N · d · Vn / (M · L), N · d ≠ a · P, Vs: transfer speed in the y direction, N: actually Number of coating means for coating, Vn: scanning speed in x direction, M: even number L: coating width in x direction, a: integer (1, 2, 3, ...) Paint is supplied to the means.

[Action]

For example, five spray guns 16 _{1 to} 16 ₅ are arranged in the Y direction at a pitch of P = 2d, N = 3 and M = 2, and V
_{With the} relation of _s = (3 · d / 2 · L) V _n , the paint is supplied to the _three spray guns 16 _{1 to} 16 ₃ and the scan coating of 2 (M = 2) times is performed. As shown in the figure,
The coating band (solid line band) of the spray gun 16 ₁ is formed at a pitch of 3d in the y direction, and the coating band (dotted line band and chain line) of the second and third spray guns 16 ₂ and 16 ₃ is formed in the unpainted portion of this coating band. Band) is formed. N ・ d = a ・ P (N ・
d is an integer multiple of P), for example, P = 3d,
A quadruple streak appears when the coating strips of one spray gun overlap exactly with the coating strips of another spray gun, but P = 2d.
Since (N · d ≠ a · P), a quadruple line does not appear,
The dotted and solid diagonal lines in Figure 5b are all overlaps (double streaks) at the edges of the painted ends of adjacent spray guns.
In this coating mode, the coating amount of one spray gun is 5a.
If it is the same as the case of single gun coating shown in the figure (the amount of paint sprayed per unit time is equal and V _n is also equal), the transfer speed is three times that of the case of single gun coating (Fig. 5a). The painting is done in, and the painting speed is fast.

Similarly, five spray guns 16 _{1 to} 16 ₅ are arranged in the Y direction at a pitch of P = 2d, N = 5 and M = 2, and V
_{With the} relation of _s = (5 · d / 2 · L) · V _n, when the paint is supplied to the _five spray guns 16 _{1 to} 165 and the scan coating of 2 (M = 2) times is performed, As shown in FIG. 5c, the coating band (solid line band) of the first spray gun 16 ₁ is 5d in the y direction.
It is formed with a pitch.
Coating band of the 5 spray gun 16 _{2-16 5} (dotted band, chain line band one point over chain line zone and the thick solid line two points) are formed.
Since P = 2d (N · d ≠ a · P), quadruple lines do not appear, and the dotted diagonal lines, solid diagonal lines, etc. in Fig. 5c are all overlapping (double It is a line). In this coating mode, assuming that the coating amount of one spray gun is the same as in the case of the single gun coating shown in FIG. 5a (the amount of paint sprayed per unit time is the same, and V _n is the same). In the case of gun coating (5a), coating is performed at a transfer speed five times higher, and the coating speed is high.

If a single spray gun is applied with the relationship of V _s = (d / 4L) · V _n , the paint is applied four times as shown in Fig. 6a, and the boundary of the paint strip is doubled. It is a streak and the quadruple streak does not appear. In the case of double coating shown in FIG.
When the direction scanning speed V _n is the same and the paint injection amount per unit time is the same, the coating thickness is doubled and the transfer speed in the y direction is halved. If V _n is made the same and the amount of sprayed paint is halved, the same coating thickness can be achieved by coating four times, and since quadruple lines do not appear, a coating film with high peel resistance can be obtained.

By the way, according to the present invention, five spray guns 16 ₁
~ 16 ₅ were arranged at a pitch of P = 2d in the Y direction, N =
3, M = 4, and V _s = (3 · d / 4 · L) · V _n, so that the paint is supplied to the _three spray guns 16 _{1 to} 16 ₃ to obtain 4 (M = 4).
When the scan coating is applied once, as shown in FIG. 6b,
The painted band (solid line band) of the first spray gun 16 ₁ is in the y direction 1.
Formed with 5d pitch, 2nd and 3rd spray gun 1
6 ₂ and 16 ₃ painted zones (dotted line zone and chain line) are y
It is formed with a shift of 2d and 4d in the respective directions. Since P = 2d (N · d ≠ a · P), quadruple lines do not appear, and the dotted diagonal lines, solid diagonal lines, etc. in Fig. 6b all overlap the edges of the paint zones of adjacent spray guns (double It is a line). In this coating mode, the coating amount of one spray gun is the same as in the case of the single gun coating shown in FIG. 5a (the coating amount per unit time is equal, and V _n is also equal).
, Then double the coating thickness is achieved at a transfer rate of 1.5 times the double coating rate with a single gun (FIG. 5a). The transfer rate is three times the transfer rate in the case of the single gun quadruple coating shown in FIG. 6a. In this embodiment, if the amount of paint sprayed per unit time of each spray gun is halved as compared with the case of coating twice with a single gun (Fig. 5a), coating with the same coating thickness is 1.5 times that of coating four times. The coating speed is high and the number of coatings is large, and since the quadruple stripes do not appear despite the large number of coatings, a coating film having high peel resistance can be obtained.

Similarly, five spray guns 16 _{1 to} 16 ₅ are arrayed in the Y direction at a pitch of P = 2d, N = 5 and M = 4, and V
_{With the} relation of _s = (5 · d / 4 · L) · V _n , the paint is supplied to the _five spray guns 16 _{1 to} 165 and the scan coating of 4 (M = 4) times is performed. As shown in FIG. 6c, the coating band (solid line band) of the first spray gun 16 ₁ is 3d in the y direction.
Formed on the pitch, the second to fifth spray guns 16 _{2 to} 16
₅ coating bands (dotted line band, one-dot chain line band, two-dot chain line band and thick solid line band) are 2d, 4d, 8d and 1 respectively in the y direction.
It is formed with a shift of 0d. P = 2d (N · d ≠ a
-P), no quadruple lines appear, and the dotted diagonal lines, solid diagonal lines, etc. in Figure 6c are all overlaps (double lines) at the edges of the painted ends of adjacent spray guns. In this coating mode, assuming that the coating amount of one spray gun is the same as in the case of the single gun coating shown in FIG. 5a (the amount of paint sprayed per unit time is equal, and V _n is equal), it is doubled. 2. If the coating with the same thickness is applied twice with a single gun (Fig. 5a) 2.
The transfer rate is 5 times higher. In this embodiment, if the amount of paint sprayed per unit time of each spray gun is halved as compared with the case of coating twice with a single gun (Fig. 5a), the coating with the same coating thickness is 2.5 times that of coating four times. At a transfer rate of
Since the number of times of coating is large, and even though the number of times of coating is large, quadruple lines do not appear, so that a coating film having high peel resistance can be obtained.

Furthermore, 5 spray guns 16 _{1 to} 16 ₅ are moved in the Y direction by P.
= 2d pitch, N = 3, M = 8, V _s
= (3 · d / 8 · L) · V _n , the paint is supplied to the _three spray guns 16 _{1 to} 16 ₃ to perform 8 (M = 8) times of scanning coating, and the sixth b The spray gun shown in the figure has half the pitch, and each spray gun 16 ₁
Paint band to 16 ₃ are formed in the y-direction 0.75d pitch.
Since P = 2d (N · d ≠ a · P), a quadruple line does not appear. In this coating mode, assuming that the coating amount of one spray gun is the same as in the case of the single gun coating shown in FIG. 5a (the amount of paint sprayed per unit time is equal, and V _n is also equal), it is 4 times. The coating with the coating thickness of 1 is performed at a transfer speed of 0.75 times that in the case of coating twice with a single gun (Fig. 5a). In this embodiment, in the case where the amount of paint sprayed per unit time of each spray gun is applied twice with a single gun (Fig. 5a).
When set to 1/4, the coating with the same coating thickness is applied 8 times, and since the number of times of coating is large, and even though the number of times of coating is large, quadruple lines do not appear, so a coating with high peel resistance Is obtained.

Similarly, five spray guns 16 _{1 to} 16 ₅ are arranged in the Y direction at a pitch of P = 2d, and when N = 5 and M = 8, V
_{With the} relation of _s = (5 · d / 8 · L) · V _n, when the paint is supplied to the _five spray guns 16 _{1 to} 165 and the scan coating of 8 (M = 8) times is performed, The spray gun shown in Fig. 6c has a pitch of ½ and each spray gun 16 ₁
Paint band to 16 ₅ are formed in the y-direction 1.25d pitch.
Since P = 2d (N · d ≠ a · P), a quadruple line does not appear. In this coating mode, assuming that the coating amount of one spray gun is the same as in the case of the single gun coating shown in FIG. 5a (the amount of paint sprayed per unit time is equal, and V _n is also equal), it is 4 times. The coating with the coating thickness of 1. is performed at a transfer speed of 1.25 times that in the case of coating twice with a single gun (Fig. 5a). In this embodiment, in the case where the amount of paint sprayed per unit time of each spray gun is applied twice with a single gun (Fig. 5a).
If it is set to 1/4, the same coating thickness can be applied 8 times and 1.2
It is carried out at a transfer speed of 5 times, and the number of times of coating is large, and even though the number of times of coating is large, quadruple lines do not appear, and thus a coating film with high peel resistance can be obtained.

As described above, according to the present invention, since the number of spray guns used for coating is large, it is possible to perform coating at a high transfer speed V _s , and even though a plurality of spray guns are simultaneously used for coating, Since quadruple lines do not appear, the coating thickness uniformity and peeling resistance are not impaired. In addition, since coating can be performed four times or more without developing quadruple lines, it is possible to obtain a coating that is relatively thick, has high uniformity, and has high peel resistance, and enables high-speed coating. A thick coating film can be applied, and a coating film having high uniformity and high peel resistance can be obtained.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 shows the overall structure of a coating line for coating thick coatings on the front and back surfaces of thick steel plates.

The steel plate having a thickness of 4.5 mm or more is first heated in the first preheating furnace 40. This preheating promotes vaporization of the solvent from the steel plate surface during the coating of the first surface, which is one of the front and back surfaces of the steel plate in the first coating machine described later, and the number of coatings is large. This is done to improve the sex. The front and back surfaces of the preheated steel plate are roughened by shot blasting 60. This roughening is performed for removing foreign matters such as scales on the front and back surfaces of the steel sheet and for forming fine irregularities for enhancing the peeling resistance of the coating film.
In shot blasting 60, a large amount of steel ball jets having a diameter of about 1 mm are simultaneously applied to the first surface (here, the upper surface) and the second surface (the lower surface) of the steel sheet.
The surface and the second surface are roughened to a roughness of 30 to 70 μm.

The first surface (top surface in this case) of the steel sheet whose front and back surfaces are roughened is
The frame is coated by the one coating machine 70 and sent to the first dryer 80. When the coating film dries, the steel sheet is sent to the front / back reversing machine 90,
Therefore, the upper surface and the lower surface are reversed to be reversed. That is, the steel sheet is turned upside down, and the painted first surface becomes the lower surface and the unpainted second surface becomes the upper surface. The second surface (the upper surface in this case) of the inverted steel plate is frame-painted by the second coating machine 100. Even during the frame painting of the second surface, the steel sheet is at a relatively high temperature just after the preheating by the preheating furnace 50 due to the residual heat of the heating in the first dryer 80, and the frame painting of the second surface is not performed. In the meantime, the evaporation of the solvent from the steel plate surface is fast, and the coating film thickness uniformity is high in the thick film coating with many coating times.

The steel plate on which the frame painting of the second surface is finished is sent to the second dryer 100, and when the drying is finished, it is discharged from the painting line.

FIG. 2 shows the main components of the second coating machine 100. Second
A steel plate detector 56 (non-contact proximity switch) for detecting arrival of a steel plate to the second simple device 100 is installed on the entrance side of the coating machine 100. Incoming steel sheet is transported to the right in roller 1 _{5-1 16} transport table. Roller 1 _{5-1 16} forms a land 1a of rollers at a predetermined pitch, the lands 1a, in so the lower surface of the second atomizer 100 steel is painted surface object not to damage it, opening It is covered with a rubber cap 1b having a bottom. Between adjacent rollers (eg 1 ₁₀ and 1 _11), the gap between the lands 1a of one roller lands of the other roller so as to be opposed, lands 1a are distributed in the form staggered (zigzag). Note that it is effective to form the lands 1a, What put gaps between the x-direction land, the paint mist is spray gun 16 ₁ to 16 ₅ for coating was sprayed, adhered amount small comb to the roller surface and, This is for facilitating the escape and removal of the adhered paint from the roller surface (draining and wiping).

Roller 1 _{5-1 16} transfer table is disposed in 1m pitch in the y-direction, the power transmission mechanism 2, via a reduction gear 3 and variable speed coupling 4, an induction (induction) motor 5, a steel sheet It is rotationally driven in the direction from left to right in FIG. The rotation speed of the motor 5 is constant (fixed), but the rotation speed of the output shaft of the joint 4 (withstands the rotation speed of the input shaft rotatably driven by the motor 5) depending on the value of the current flowing through the electric coil of the variable speed joint 4. since the ratio of the rotational speed of the output shaft) is determined, y-direction transfer velocity v _s of the rotational speed, that the steel plate of the roller 1 _{5-1 16} transport tables can be set or adjusted by the value of the current through the variable speed coupling.

The rotary encoder 6 generates one electric pulse for each rotation of the output shaft of the speed reducer 3 by a predetermined small angle. The frequency of the electric pulse generated by the rotary encoder 6 is proportional to the transfer speed V _{s of the} steel plate sent by the transfer table. This electric pulse is amplified and waveform shaped by the signal processing circuit 33.
Given to the F / V converter 34, the F / V converter 34
Generates an analog voltage of a level indicating V _s .

The speed control circuit 32 includes a painting control computer 200.
However, as will be described later in detail, data indicating the transfer speed V _s is supplied, and the circuit 32 latches (stores) this data internally every time it is supplied, and stores it in an analog voltage (transfer speed target value signal). ), And the analog voltage (feedback speed signal) indicating the actual transfer speed given by the F / V converter 34 is adjusted so that the analog voltage (feedback speed signal) matches the target value signal.
Increase or decrease the current value supplied to the. That is, the speed control circuit 32 performs constant speed control of the steel plate transfer speed to the speed V _s instructed by the computer 200.

Since the steel sheet is conveyed to the second coating machine 100 by center alignment (the center point of the coating machine 100 in the x direction, that is, the center line of the width of the steel sheet in the x direction is aligned with the center line), the roller groups 1 ₅ to 1 ₁₆ are conveyed. A steel plate detector 19 (non-contact proximity switch) for detecting the arrival of a steel plate is installed at a y-direction base point on a center line extending in the y direction of the transfer table. After the detector 19 detects the tip of the steel plate, the rotary encoder 6 counts the number of electric pulses generated to detect the arrival of the tip of the steel plate in the detector 1.
It is possible to track which position in the y direction the base point is 9. The computer 200 performs this tip position tracking. Similarly, by counting the electric pulses generated by the encoder 6 after the signal of the detector 19 is switched from the presence (1: high level H) of the steel sheet to the absence (0: low level L), the tail end of the steel sheet is detected. It is possible to track which position in the y direction is based on the detector 19 as a base point. The computer 200 also performs the tail end position tracking.

Two guide rails (not shown) are arranged in the x direction, and the endless chains 7 ₁ and 7 ₂ are stretched along each of the guide rails. One end of the chain 7 ₁ is supported by a gear 8 ₁ that meshes with the chain 7 ₁ ,
₂ at one end is supported by the gear ₈₂ meshed therewith. That is, the chains 7 ₁ and 7 ₂ are folded back at the gears 8 ₁ and 8 ₂ , respectively.

Chain _71, the lower part of the second portion facing the top and bottom,
Guide rails and carriages 14 ₁ which is freely guided movement is connected to x-direction, the chain 7 _2, the same carriage 14 ₂ are connected in the same manner, these carriages 14 _1, 14 _2, Vertical position adjustment mechanism (not shown) (for the purpose of adjusting the vertical distance between the steel plate surface and the spray gun to set a constant value in accordance with the variation of the steel plate thickness: a spray gun against the variation of the plate thickness The y
(For the purpose of adjusting the direction coating width d to be constant),
A spray gun support bar 15 is supported. The support bar 15 includes five spray guns 16 _{1 to} 16 for painting.
₅ are arranged in the y direction at a pitch of P = 1 m, and each of the spray guns 16 _{1 to} 16 ₅ is on the midpoint of the gap between the adjacent rollers of the rollers ₁₈ to 1 ₁₃ of the transfer table, The carriage 1 is oriented vertically downward.
By the vertical position adjusting mechanism (not shown) on 4 ₁ and 14 ₂ ,
When the distance between the upper surface (second surface) of the steel plate sent by the transfer table ( ₁₈ to 1 ₁₃ ) and the spray guns 16 _{1 to} 16 ₅ is set to a reference value, each spray gun 16 ₁ to the steel plate 16 ₁ to 16 ₅ in the y-direction intermediate coating width d is 0.5 m. Thus, in this example, P = 2d.

The gears 8 ₁ and 8 ₂ meshing with the chains 7 ₁ and 7 ₂ are fixed to a rotary shaft 9 supported by bearings (not shown). The rotating shaft 9 is driven to rotate forward and backward by a DC motor 12 via a speed reducer 10 and a variable speed joint 11. Motor 1
The forward and reverse rotation speeds of 2 are equal and constant (fixed), but depending on the value of the current flowing through the electric coil of the variable speed joint 11, the joint 11
Since the rotation speed of the output shaft of is determined, the gears 8 ₁ and 8 ₂
Forward and reverse rotation speed of the spray gun 16 _{1 to} 16 ₅
The reciprocal scanning speed V _{n of} is set or adjusted by the value of the current flowing through the variable speed joint 11. The rotary encoder 13 generates one electric pulse for each rotation of the output shaft of the speed reducer 10 by a predetermined small angle. The frequency of the electric pulse generated by the rotary encoder 13 is proportional to the scanning speed V _n of the spray guns 16 _{1 to} 16 ₅ . This electric pulse is amplified and waveform-shaped by the signal processing circuit 43, and the F / V converter 4
4, the F / V converter 44 generates an analog voltage of a level indicating the scanning speed V _n .

The speed control circuit 42 includes a painting control computer 200.
However, as will be described later in detail, data for instructing the scanning speed V _n is supplied, and the circuit 42 latches (stores) this data internally every time it is supplied, and stores it in an analog voltage (scanning speed target value signal). ), And the analog voltage (feedback speed signal) indicating the actual scanning speed given by the F / V converter 44 matches the target value signal in the direction of the variable speed joint 1
The current value supplied to 1 is increased or decreased. That is, the speed control circuit 42 controls the scanning speed to the speed V _n instructed by the computer 200 at a constant speed.

In this embodiment, the steel plates are sent to the transfer table ( ₁₅ to 1 ₁₆ ) with center alignment, so that the coating width L in the x direction is L.
Is L to the left and right of the center line of the transfer table.
The spray guns 16 _{1 to} 16 ₅ are scan-driven by / 2, and the spray guns / 6 _{1 to} 16 ₅ are reversely driven (the rotation direction of the DC motor 41 is reversed). In order to track the x-direction position of this scanning drive, a steel plate detector 18 (non-contact proximity switch) is arranged above the center line of the transfer table ( ₁₅ to 1 ₁₆ ), and the support bar 15 has The steel plate 17 is erected. Detector 18 is 1 when there is a steel plate 17 immediately below the (high level H: spray gun 16 ₁ to 16 ₅ to indicate that an on center line) and, when there is no steel plate 17 just below 0 (low level L ) Signal is generated. This detection signal is given to the computer 200. The computer 200 has a DC motor 1
While urging 2 to rotate, the electric pulse generated by the encoder 13 is counted, and when the signal of the detector 18 becomes 1, the count value is cleared (count value initialization: count value is set to 0), Also, counting up from 0,
When the count value reaches L / 2 (L: designated coating width in the x direction), the rotation direction of the DC motor is reversed, the count value is cleared, and the count is incremented from 0 again. As a result, in the x direction, the support bar 15 (spray guns 16 _{1 to} 16 ₅ ) moves about the center line (18),
It is reciprocally driven with the stroke of.

Each of the spray guns 6 _{1 to} 16 ₅ is connected to the main pipe 21 via each of the electromagnetic opening / closing valves 20 _{1 to} 20 _5.
The paint to be pumped to is selectively supplied.

The x-direction end portion of the reciprocating scanning coating with the stroke L of the spray guns 16 _{1 to} 16 ₅ does not become a straight line (parallel to y). To finish having uniform coating edge of the coating in a straight line, standing blown spray gun 16 ₆ and 16 ₇ are arranged. For these, L is set to various values, so x
The position can be adjusted in any direction. It should be noted that the coating with these standing spray guns 16 ₆ and 16 ₇ is not related to the gist of the present invention, and thus detailed description thereof will be omitted.

The painting control computer 200, from the data processing computer 300, painting condition data are given about the spray gun ₁₆ 1 to 16 _5. The coating condition data includes the x-direction scanning speed V _n , the number of times of coating M, the x-direction coating width L, the y-direction transfer speed V _s, and the number N of spray guns that actually spray the paint. In this embodiment, the coating conditions are set so that the combinations shown in Table 1 below are applied.

The data processing computer 300 is supplied with coating condition data from a host computer (not shown), or is input with a keyboard of the computer 300.

In this embodiment, the coating parameters (variable parameters) that can be adjusted and set by the operator are the coating width L in the x direction, the coating number M, the scanning speed V _n, and the transfer speed V _s . coating width d in the y direction is constant at 0.5 m, the y-direction array pitch P of the spray gun ₁₆ 1 to 16 ₅ is constant at 1 m.

Coating thickness, the pressure of the paint applied to the spray gun ₁₆ 1 to 16 _5, proportional to the scan velocity V _n and coating times M.
In this embodiment, first set the appropriate value in the pressure of the coating material applied to the spray gun 16 ₁ to 16 _5, Tekichi than this and the target coating thickness Prefecture, the V _n and M to calculate the V _n × M Specified in. When V _n or M is out of the proper value range, they are provisionally determined within the proper value range, and then the pressure of the paint is adjusted. In this way, the pressure of the paint, V
Determine _n and M. When the number of times M of coating is prioritized, M is first determined, and the pressure of the paint and the scanning speed V _n are determined based on this. When the pressure of the paint is determined and the scanning speed V _n and the coating number M are determined, the operator inputs the scanning speed V _n , the coating number M, the coating width L in the x direction and the transfer speed V _s to the data processing computer 300. .

When these inputs are made, the data processing computer 300 calculates the required number of guns Np actually used for painting by V _s = Np · d · V _n / (ML). This Np is the given V
Since it may not with any mates _s at 1, 3, 5 of the 1,3,5, determine the value closest to use the number of nozzles N in the Np. Then, V _s = N · d · V _n / (M ·
L), the transfer velocity V _s is calculated, and is calculated in the table (1
The transfer speed target value of ₅ to _11.6 ) is determined.

FIG. 3 shows the processing operation of the data processing computer 300. When the power is turned on (step 1: the word "step" is omitted hereinafter in parentheses), the computer 300
The coating management program of the storage medium externally mounted in the storage device is read, and the coating condition input menu screen is displayed on the display (2). Then, the operator input from the keyboard is read (3). When V _n is input, it is read into the register RV _n , 1 is written to the register (flag) FV _n indicating that V _{n has been} input, and similarly, M,
If there are inputs of L and V _s , register them as registers RM and R
Write to L, RV _s and write 1 to registers FM, FL, FV _s (4-15). If there is a clear key input between these inputs, the input data immediately before that is erased and the corresponding flag register is cleared (0 is written) (2
3, 30). Note that each time data is input, the input data is displayed in the corresponding column (input parameter column) on the input menu display screen of the display. When V _n , M, L and V _s are all input (the contents of FV _n , FM, FL and FV _s are all 1), the computer 300 causes Np = M · L · V _s / (d · in V _n), to calculate the number of used cancer virtual value Np (16, 17),
Of 1, 3, and 5, the one that is closest to Np (the one with the same rating has the larger number) is determined as the number of guns to be used (1
8) Write this N in the register RN (19). Next, the transfer speed V _s is calculated (20) by V _s = N · d · V _n / (M · L), this V _s is written in the register RV _s (21), and the registers RV _n , RM , RL
The data V _n , M, L, and V _s of RV _s and RV _s are displayed on the menu display screen of the display (22). If there is a cancel key input here, the registers RV _n , RM, R
L and RV _s and freg registers FV _n , FM, F
It clears all L and FV _s , erases the display of their data and returns to their pre-input display (32).
The data V _{n of} the registers RV _n , RM, RL and RV _s ,
When the memory instruction key is input while M, L and V _s are displayed on the menu display screen of the display, the computer 300 displays the table A (one area of the internal memory).
Of the registers RV _n , RM, RL and RV _s , write the data V _n , M, L and V _s of the registers RV _n , RM, RL and RV _s , clear the flag registers FV _n , FM, FL and FV _{s An} input menu screen is displayed with the input fields for _n , M, L and V _s left blank (25).

When the operator inputs the coating conditions for the first to nth steel plates as described above, the computer 300
In Table A, the coating conditions (V _n , M, L and V _s ) of those steel plates are written in the first to nth columns.

If there is an execution key input in this state, the computer 300
Additionally writes the data of table A (first column to nth column) to the schedule table (one area of the storage medium externally mounted on the storage device) (26, 27), and then writes the data of table A The data is transferred to the painting control computer 200 (28) and the data in the table A is cleared (29).

FIG. 4a shows the painting control operation of the painting control computer 200. When the computer 200 is powered on (41), the computer 200 outputs a standby output signal (all L) to the output port (output port clear), clears the input port, and also internal registers, timers, counters, etc. After clearing, the computer 300 is notified of the ready (42).

When the computer 300 sends the data (table A), the computer 200 sends the received data to the table B.
Additional writing to (one area of internal memory) (44, 4
5). Then, when the data is received for the first time after the power is turned on (FIS = 0), 1 is written in the flag register FIS (46, 47), and the data V _n in the first column of the table B,
M, L and V _s are read out to register RV _n , RM, R
Write to L and RV _s (48). Then, it waits until the steel plate arrives at the entrance side (56) of the transfer table ( ₁₅ to 1 ₁₆ ) (the detection signal D _p of the detector 56 becomes 1) (4
9).

Computer 200 when steel sheet arrives (D _p = 1)
Outputs the data V _s (target value V _s ) of the register RV _s to the speed control circuit 32, and outputs 1 for designating the motor drive to the motor driver 31 (50). As a result, the induction motor 5 is started, and the speed control circuit 32 causes the speed of the steel plate transfer speed V _{s of} the transfer table (1 ₅ to 1 ₁₆ ) to reach the given target value V _s. The electric current value of the coil is controlled, and the steel plate detected by the detector 56 is transferred from the left to the right (FIG. 2) on the transfer table ( ₁₅ to ₁₆ ) at a speed of substantially V _s .

The computer 200 causes the speed control circuit 42 to register RV _n at substantially the same time that the motor 5 is started as described above.
Output the data V (target value V _n ) (51) and specify the normal rotation drive of the motor 12 to the motor driver 41 Sf =
1, Sr = 0 is output (52). As a result, the DC motor 12 is started in the normal rotation (forward scan), and the speed control circuit 42
, The energization current value of the electric coil of the variable speed joint 11 is controlled so that the scanning speed V _n of the spray guns 16 _{1 to} 16 ₅ becomes a given target value V _n , and the spray guns 16 ₁ to 1
6 _5, from the standby position shown in FIG. 2, the left (forward) driven towards the center line (18).

Computer 200 is then spray gun ₁₆ 1 to 1
6 ₅ reaches the center line: waiting (would Dnc = 1 detector 18 detects the steel plate 17) of (53),
When the center line is reached, data (stop instruction) for instructing speed 0 is given to the speed control circuit 42 (54), and Sf = 0, S for instructing the motor driver 41 to stop the motor.
Give r = 0 (55). Then, the x-direction scanning position register RXD is cleared (56), the interrupt 1 is permitted (57), and the process returns to the input reading (43).

When the initial processing immediately after the power is turned on is completed as described above, the computer 200 performs the processing of step 60 and subsequent steps each time the steel plate is detected by the detector 19 (D _s is switched from 0 to 1).

That is, the computer 200 uses the transfer tables ₁₅ to.
Wait until the steel plate sent at 1 ₁₆ is detected by the detector 19 (D _s becomes 1) (43-44-58-5).
9) When it is detected, the data V _n , M, L and V _s in the first column of the table B are read out and the registers RV _n and R are read.
Write to M, RL and RV _s (60). Then, 1 is written in the flag register FST (indicating that the tip of the steel plate has already been detected by the detector 19) (61),
The data V _s of the register RV _s (the target transfer speed of the steel plate sent by the transfer table) is output to the speed control circuit 32 (62), and the motor driver 31 is instructed to drive the motor 5 (63), y Direction steel plate top transfer position register RYT
Is cleared (64) and interrupt 2 is permitted (65).

Next, the computer 200 outputs the data V _n (the target scanning speed of the steel plate sent by the transfer table) in the register RV _n to the speed control circuit 42 (66), and causes the motor driver 41 to rotate the motor 12 normally (forward). Scanning is instructed (6
7), permitting interrupt 1 (68) and permitting interrupt 3 (6
9) and returns to input reading (43).

By the above steps 60-69, the top (tip) is detected by the detector 19 steel plate, is transferred to the y-direction velocity data V _s of the register RV _s as a target value, the spray gun ₁₆ 1 to 16 _5, forward scanning from the top center line (18): (left direction as viewed from the moving direction of the steel sheet), driven speed data V _s of the register RV _s in the x direction as the target value.

Since the interrupt 1 is permitted, the computer 200 executes the process of the interrupt 1 shown in FIG. 4b every time the rotary encoder 13 generates one electric pulse. That is, when the encoder 13 generates one electric pulse,
The contents of the x-direction position register RXD are updated to indicate a numerical value larger by 1 (81), and it is checked whether the updated value RXD is L / 2 or more (82). If not, the main routine (first) 4a), the step immediately before proceeding to the interrupt 1). If it is L / 2 or more, the drive direction of the motor 12 is checked (83), and if it is forward rotation (forward scanning) drive, reverse rotation drive (Sf = 0, Sr =
If 1) is the reverse rotation (reverse scan) drive, the normal rotation drive (Sf = 0, Sr = 1) is instructed to the motor driver 41 (the x direction scanning direction is reversed: 84, 85), and the x direction position is set. The register RXD is cleared (86) and the process returns to the main routine.

Since the interrupt 3 is permitted, the computer 200
Detector 18 each time generates a single electrical pulse (spray gun 16 ₁ to 16 ₅ arrives on the center line), executes the processing of the interrupt 3 shown in 4c FIG. That is, the detector 18 detects the steel plate 17 (this is the motor 1
2 in the forward direction to drive the spray guns 16 _{1 to} 16 ₅ in the forward direction and in the reverse direction to drive the motor 12 to drive the spray guns 16 _{1 to} 16 ₅ in the backward direction. Each time) occurs, the x-direction position register RXD is cleared (131) and the process returns to the main routine. It should be noted that at the time when the coating of the steel sheet being transported by the transport table ( ₁₅ to 1 ₁₆ ) is finished, 1 (the coating of one steel sheet is finished) is written in the flag register FEN (step 12 in FIG. 4d).
1). As described above, the register RXD is cleared (13
1) and whether the content of the flag register FEN is 1 is checked (132), and when it is 1, the data designating the speed 0 is output to the speed control circuit 42 (133) and the motor driver 41 is stopped. It outputs (Sf = 0, Sr = 0) (134) and returns to the main routine.

By the processing of the interrupt 1 and the interrupt 3 described above, the coating of the steel sheet detected by the detector 19 is completed (FEN = 1.
Until the made), the spray gun ₁₆ 1 to 16 ₅ is reciprocally scanned in L width in the x direction around the center line (18), the data in the x-direction position register RXD constantly from the center line (18) , Spray guns 16 _{1 to} 16 ₅
Indicates the distance (x coordinate). Flag register F
When the content of EN becomes 1 (painting completed), spray gun 1
When 6 _{1 to} 16 ₅ come on the center line (18), the x-direction scanning drive of the spray guns 16 _{1 to} 16 ₅ is stopped.

Since the interrupt 2 is permitted, the computer 200 causes the rotary encoder 6 to generate one electric pulse each time.
The process of interrupt 2 shown in FIG. 4d is executed. That is, when the encoder 6 generates one electric pulse, first the paint injection start control (91 to 105) is executed, and then the paint injection end control (106 to 122) is executed.

In the paint injection start control, the content of the flag register FST is 1 (after the steel plate arrives at the detector 19, the supply of the paint to the N spray guns 16 ₁ to 16 N is not completed for that; Then, in step 105, F
Under the condition that ST = 0), the content of the y-direction position register RXT is updated to a value indicating one larger value (9
2), updated value RYT is checked whether equal to or more than Dk (93) becomes higher Dk when the solenoid valve 20 ₁ for supplying paint to the spray gun 16 ₁ and open (94). That is, the top of the steel plate is in the y direction and the spray gun 16 ₁
The spraying of the paint is started from the spray gun 16 ₁ at the timing immediately below. When the content of the register RN is 1, then the content of the flag register FST is cleared to 0 (finishing the paint injection setting of the required gun) (105), and the process proceeds to paint injection end control (106 and below).

When the content of the register RN is 3, when the contents RXT y position register RXT becomes Dk + d (when the top of the steel sheet has arrived immediately the spray gun 16 ₂₎ the solenoid valve 20 ₂ is opened to , RXT is Dk + 2d
The solenoid valve 20 ₃ is opened, then the contents of the flag register FST to 0 (exit the paint injection setting of the required cancer) when it is (when the top of the steel sheet arrives directly below the spray gun 16 ₃₎ After clearing (105), the process proceeds to paint injection end control (106 or less).

When the content of the register RN was 5, when the contents RXT y position register RXT becomes Dk + 3d (when the top of the steel sheet arrives directly below the spray gun 16 ₄₎ the solenoid valve 20 ₄ is opened to , RXT is Dk + 4
when it becomes d switch valve 20 ₅ (when arriving directly below the top of the steel sheet spray gun 16 ₅₎ is opened, then the contents of the flag register FST (finished paint injection setting of the required cancer) 0 (105), and proceeds to paint injection end control (106 or less).

By the above paint injection start control, the content N of the register RN is
There when 1, paint injection spray gun 16 ₁ is started when the top is detected by the detector 19 steel sheet proceeds directly below the spray gun 16 _1, the flag register FS
T is cleared. When the content of the register RN is 3, after the spray injection of the spray gun 16 ₁ is started as described above, the spray injection of the spray gun 16 ₂ is started when the top of the steel plate goes directly below the spray gun 16 _2. so, and the top of the steel sheet is coating injection spray gun 16 ₃ is started to when proceeding directly below the spray gun 16 _3, the flag register FST is cleared. Register R
When the content of N is 5, the spray gun 1 ₃ is started when the spraying of the spray gun 16 ₃ is started as described above, and then the top of the steel plate is moved directly below the spray gun 16 _4.
6 ₄ paint injection is the beginning of the spray gun 16 when, and the top of the steel sheet has advanced to just below the spray gun 16 ₅
The paint injection of No. ₅ is started, and the flag register FST is cleared. When the value of the flag register FST becomes 0, the process does not proceed to steps 91 to 92, so that the paint injection start control (92 to 105) is not executed until the content of FST becomes 1.

Referring again to FIG. 4a, when the detection signal Ds of the detector 19 is switched from 1 indicating that the steel plate is present to 0 indicating that the steel plate is not present, the computer 200 sets 1 in the flag register FSB (paint injection end control). Required) and clear the y-direction steel plate bottom (tail end) position register RYB (7
1-73).

Referring again to FIG. 4d, in the paint injection termination control, first, whether or not (FSB = 1) / (FSB = 0) is checked, and if (106) Necessary (FSB = 1), the register R
Update the contents of YB to show a value that is 1 larger (10
7), and checks whether the updated value RYB becomes more Dk and (108) solenoid valves 20 ₁ supplies the coating becomes more than Dk to spray gun 16 ₁ and closed (109). That is, the bottom of the steel plate is in the y direction, and the spray gun 16 ₁
The spraying of the paint from the spray gun 16 ₁ is stopped at the timing immediately below. When the content of the register RN is 1, next post-termination processing (120 to 123) is executed and the process returns to the main routine. That is, the contents of the flag register FSB are cleared to 0 (the injection stop of the required gun is finished) (1
20), interrupt 2 is prohibited (121), and flag register F
Write 1 to EN (finish painting of one steel plate) (12
2) Erase the data in the first column of table B, the data in the second column in the first column, the data in the third column in the second column, ...
Then, update the data and write the data of table B,
The data of the coated steel plate is erased and the data of the unpainted steel plate is rearranged in the first and subsequent columns (123). Then return to the main routine.

When the content of the register RN was 3, the y-direction position register solenoid valve 20 ₂ when the contents RXT becomes Dk + d (when the top of the steel sheet arrives directly below the spray gun 16 ₂₎ of RXT is closed (111,112),
When RXT becomes Dk + 2d (when the top of the steel sheet arrives directly below the spray gun 16 ₃₎ to the solenoid valve 2
0 ₃ is closed (114), then exit after treatment (120-12
Execute 3) to return to the main routine.

When the content of the register RN was 5, when the contents RXT y position register RXT becomes Dk + 3d (when the top of the steel sheet arrives directly below the spray gun 16 ₄₎ the solenoid valve 20 ₄ is closed to (115, 116,
117), when the RXT becomes Dk + 4d (the switch valve 20 ₅ when the top of the steel sheet arrives directly below the spray gun 16 ₅₎ is closed (119), then exit after treatment (120 to 123) Execute and return to the main routine.

By the above paint injection end control, the content N of the register RN is
There when 1 is paint injection spray gun 16 ₁ is stopped when the bottom is detected by the detector 19 steel sheet proceeds directly below the spray gun 16 _1, after completion of treatment (120
~ 123) are executed. When the content of the register RN is 3, the bottom of the steel plate is moved to the spray gun 16 ₂ after the spraying of the spray gun 16 ₁ is stopped as described above.
A paint injection spray gun 16 ₂ stops when it proceeds to the right under the, and the bottom of the steel sheet is coating injection spray gun 16 ₃ is stopped when proceeding directly below the spray gun 16 _3, after the end of treatment ( 120 to 123) are executed.
When the content of the register RN is 5, after the spraying of the spray gun 16 ₃ is stopped as described above, the spraying of the spray gun 16 ₄ is stopped when the bottom of the steel plate goes directly under the spray gun 16 _4. was stopped and the bottom of the steel sheet is coating injection spray gun 16 ₅ is stopped when proceeding directly below the spray gun 16 _5, after the end of treatment (1
20-123) is performed. When the content of the flag register FSB becomes 0 by this post-termination processing, step 10
Since it does not proceed from 6 to 107, the paint injection end control (1
07 to 123) are not executed until the content of FSB becomes 1.

When the next steel plate is detected by the detector 19, as described above,
The reading of the data in the first column of table B (60), the setting of the transfer speed Vs and the scanning speed Vn based on the read data, the start of the reciprocal scanning in the x direction, and the paint injection start control (61 to 69) are executed. Will be started.

Setting of the above-mentioned coating conditions corresponding to the operator input of the data processing computer 300 (FIG. 3: Table 1), and the above-mentioned coating control of the coating control computer 200 based on the coating conditions given from the computer 300 ( 4a
~ 4d), the coating of various aspects shown in Table 1 is selectively executed. In any of these modes, since quadruple lines do not appear, the uniformity of coating film thickness and peeling resistance are not impaired.

In the embodiment of N = 3 or more, since the number of spray guns used for coating is large, it is possible to perform coating at a high transfer speed Vs, and even though a plurality of spray guns are used for coating at the same time, four times. Since the above coating can be performed without developing quadruple stripes, it is possible to obtain a coating that is relatively thick, has high uniformity and high peel resistance, and enables high-speed coating. Can be painted.

Referring again to FIG. 1, the first coating machine 70 has the above-mentioned second coating machine 70.
The first coating machine 70 has substantially the same configuration as the coating machine 100, but since the front and back surfaces (upper surface and lower surface) of the first coating machine 70 are not painted, the rollers of the transfer table ( ₁₅ to 1 ₁₆ ) are covered with rubber. It does not have. The other points are the same as those of the second coating machine 100. The data processing computer 300 sets processing conditions for each part of the coating line shown in FIG. 1 and collects processing data, and is also used for setting coating conditions of the first coating machine 70. That is, the data processing computer 300 shown in FIG. 2 is not a part of the second coating machine 100.

Although particular embodiments and examples have been described, the present invention may be similarly implemented in other embodiments and examples. For example, in the above embodiment, d = 0.5 m, P = 1 m, total number of spray guns 5, coating gas number N = 1, 3 or 5, coating number M
= 1, 2, 4 or 8, but these are
Coating conditions in which quadruple lines do not appear Vs = N · d · Vn / (ML), N · d ≠ a · P, Vs: transfer speed in the y direction, N: number of coating means for actually coating, Vn: scanning speed in x direction, M: even number, L: coating width in x direction, a: integer (1, 2, 3, ...)

〔The invention's effect〕

As described above, according to the present invention, since the number of spray guns used for coating is large, it is possible to perform coating at a high transfer speed Vs. Since no streaks appear, the uniformity of coating thickness and peeling resistance are not impaired. In addition, since coating can be performed four times or more without developing quadruple lines, it is possible to obtain a coating that is relatively thick, has high uniformity, and has high peel resistance, and enables high-speed coating. A thick coating film can be applied, and a coating film having high uniformity and high peel resistance can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of one coating line for carrying out the present invention. FIG. 2 is a block diagram showing an outline of the configuration of a coating machine for carrying out the present invention in one aspect. The second coating machine 100 shown in FIG.
The configuration outline of is shown. FIG. 3 is a flowchart showing the painting condition setting operation of the data processing computer shown in FIG. Figures 4a, 4b, 4c and 4d show the second
7 is a flowchart showing a painting control operation of the painting control computer shown in the figure. FIG. 5a, FIG. 5b, FIG. 5c, FIG. 6a, FIG. 6b and FIG. 6c are plan views showing the coating locus on the steel plate by the second coating machine 100 shown in FIG. 50: preheating furnace, 60: shot blasting 70: first coating machine, 80: first drying machine 90: reversing machine, 100: second coating machine 110: second drying machine 1 ₅ to 1 ₁₆ : transfer table roller 1a : Land, 1b: Rubber cap 2: Power transmission mechanism, 3: Reducer 4: Variable speed coupling, 5: Induction motor 6: Rotary encoder, 7 ₁ , 7 ₂ : Chain 8 ₁ , 8 ₂ : Gear, 9: Rotation Axis 10: Speed reducer, 11: Variable speed joint 12: DC motor, 13: Rotary encoder 14 ₁ , 14 ₂ : Carriage, 15: Support bar 16 _{1 to} 16 ₅ : Spray gun (painting means) 17: Steel plate, 18, 19: Steel plate detector 20 _{1 to} 20 ₅ : Electromagnetic on-off valve, 21: Main pipe 31: Motor driver, 32: Speed control circuit 33: Signal processing circuit, 34: F / V converter 35: Signal processing circuit, 41: Motor Driver 42: Speed control circuit, 43: Signal processing circuit 44: F / V converter, 45: Signal processing circuit 51 to 55: Solenoid Driver, 56: Sheet detector 57: signal processing circuit, 200: painting control computer 300: data processing computer

Claims (1)

[Claims] Claim: What is claimed is: 1. A coating target material, and at least one coating means for coating a surface of the coating target material with a predetermined width d in the y direction, while transporting at least one of the coating means in the y direction. In a coating method in which at least one of the material and the coating means is reciprocally scanned with respect to the other in the x direction orthogonal to the y direction to scan-coat the material to be coated, each of which applies a predetermined width d in the y direction. A plurality of coating means are arranged at a pitch P in the y direction, Vs = N · d · Vn / (M · L), N · d ≠ a · P, Vs: transfer speed in the y direction, N: actually Number of coating means for coating, Vn: scanning speed in x direction, M: even number L: coating width in x direction a: integer (1, 2, 3, ...) Of the ultra-thick film coated steel sheet, which is characterized by supplying paint to the surface of the material to be coated multiple times How to paint.