WO2007049349A1

WO2007049349A1 - Coating head

Info

Publication number: WO2007049349A1
Application number: PCT/JP2005/019829
Authority: WO
Inventors: Suehiro Touoka; Yoshihisa Nagata
Original assignee: Hirata Corporation
Priority date: 2005-10-27
Filing date: 2005-10-27
Publication date: 2007-05-03
Also published as: CN101296755A; JPWO2007049349A1

Abstract

It is intended to reduce the possibility of flawing on a coating head of coating applicator used to apply a coating liquid onto a surface of coating object member, such as a sheet-like member. There is provided a coating head having a member of sintered hard alloy effectively arranged in a distal end portion of the coating head, whereinto the above member is assembled so as to avoid any interstice permitting penetration of coating material. The coating head can be characterized in that its distal end portion is coated with a sintered hard alloy with specified thickness. This sintered hard alloy may be a cermet containing tungsten carbide (WC). Further, this coating can be performed by thermal spraying.

Description

Specification

Application head

Technical field

TECHNICAL FIELD [0001] The present invention relates to a coating tool and a coating apparatus that apply a coating liquid to a surface of a member to be coated such as a sheet-shaped member or a plate-shaped member, and in particular, a coating tool and a coating apparatus provided with a slot-shaped coating nozzle. About.

Background art

[0002] Conventionally, the surface of an object to be coated has been coated with various kinds of coatings typified by a heat-sensitive film, a conductive film, a low-reflection conductive film, an anti-ultraviolet film, an anti-electromagnetic wave film, a protective film or a magnetic film. Has been done. For example, a coating tool having a slot through which a coating liquid is passed as a coating tool mounted on a coating apparatus that performs a coating operation in which a coating liquid is thinly and uniformly applied to the surface of a sheet-like member to form a coating film layer Is used. As such an application tool, there is an application tool provided with an application head (tool body). This is illustrated in Figure 6.

[0003] The coating apparatus 911 has a coating head 910. The coating head 910 includes a first member 911 called a back edge and a second member 912 called a doctor edge attached to each other. It is made. The coating apparatus includes a feeding means (not shown) for causing the flexible belt-like support 914 to travel in the direction of the arrow (mouth) in the figure. The first member 911 and the second member 912 are flexible. The belt-like supports 914 are arranged in order along the traveling direction (mouth). That is, the first member 911 is disposed on the upstream side in the direction (mouth) in which the flexible belt-like support 914 travels, and the second member 912 is disposed on the downstream side. Between these first and second members 911 and 912, a slot 913 is formed in which the coating liquid flows toward the tips of the first member 911 and the second member 912. An outlet 913a opening at the tips of the first and second members 911 and 912 is formed.

[0004] The coating head 911 having a slot-like nose has the ability to damage the tip of the coating blade due to contact with the member to be coated 914, corrosion due to paint, and friction with particles such as pigments that may be contained. There is S. When the size of such scratches exceeds a predetermined value, the paint enters the scratches, making it difficult to form a uniform coating film. Therefore, when the scratches grow to a certain extent, It is necessary to grind the tip and regenerate the tip of the head. Therefore, the productivity of the coating process is significantly reduced, such as periodic inspection and maintenance of the coating device, suspension of the coating device during head regeneration or preparation of a spare head, and precise mounting of the head after regeneration.

FIG. 7 schematically shows examples of scratches 950 and 952 generated on the head 942. Due to contact with the member to be painted, the direction of travel force is gradually reduced to a triangular shape with a flaw 952, and some of them penetrate to the opposite side and create a deep valley 954. Typical scratch widths are as large as about 0.1 force 0.3 mm, and such scratches penetrate the paint and hinder stable film formation.

[0006] For this reason, it is desired that the tip portion of the coating head is less likely to be scratched. Specifically, it has been proposed that the material of the coating head be a cemented carbide (for example, Patent Document 1). ).

[0007] However, it is not practical to use a cemented carbide for the entire coating head because it is costly and has low machinability. Therefore, it has been proposed that only the tip of the coating head is made of cemented carbide (for example, Patent Document 2 and Patent Document 3), but assembling so that the width of the slot at the tip is uniform. It's not easy. In particular, even in the initial stage of assembly, even if the assembly is performed precisely, it is easy to change with time due to the stress generated by the differential force of thermal expansion between the members as the coating operation is repeated. Furthermore, in the assembly, there is a possibility that a coating material that easily causes a minute gap between the members permeates into the gap and changes the application condition.

Patent Document 1: JP 2000-301044 A

Patent Document 2: Japanese Patent Laid-Open No. 2002-224607

Patent Document 3: Japanese Patent Application Laid-Open No. 2004-261678

Disclosure of the invention

Problems to be solved by the invention

The present invention provides a coating head in which the hardness of only the tip portion of the head is effectively increased in consideration of the above. As a result, the wear of the tip portion is suppressed, and the coating film can be stably formed.

Means for solving the problem [0009] In the coating head according to the present invention, members made of cemented carbide are effectively arranged at the tip portion, and these members are incorporated so as not to generate a gap through which the paint penetrates. . That is, it can be characterized that the tip portion is coated with a cemented carbide of a predetermined thickness. The cemented carbide may be a cermet containing tungsten carbide (WC). Furthermore, this coating can be performed by thermal spraying. Therefore, the sprayed material can be a cermet containing tungsten carbide (WC).

[0010] More specifically, the following is provided.

[0011] (1) An application head that supplies a coating material to form a coating film on a sheet-like member, the slot having a slot extending in a direction substantially perpendicular to the application direction to the sheet-like member An application nozzle and an application head main body for holding the application nozzle,

And two nozzle tip members facing each other with a predetermined width defining the slot, and a cemented carbide coating layer formed by thermal spraying is provided on at least a portion of the nozzle tip member facing the sheet-like member or plate-like member. An application head characterized by that.

[0012] (2) The coating head according to (1), wherein a base material of the coating nozzle is made of stainless metal, and the cemented carbide coating layer is formed thereon.

[0013] (3) A cemented carbide processing method for slot-type coating nose of a coating head for supplying a coating material to form a coating film on a sheet-like member or a plate-like member, and comprising a cemented carbide at the tip of the coating head A cemented carbide processing method characterized in that after being sprayed, it is polished into a predetermined shape.

[0014] (4) A coating head characterized in that it is a slot type coating nozzle for forming a coating film on a plate-like workpiece, and is formed by spraying a cemented carbide on the nozzle tip.

[0015] (5) The coating head according to (4), wherein the coating head is made of stainless steel for the main body and cemented carbide for the tip.

[0016] (6) A cemented carbide processing method for a slot-type coating nozzle for forming a coating film on a plate-like workpiece, in which a cemented carbide is sprayed on the tip of the coating head and then the shape is adjusted by polishing. Processing method.

Here, the thermal spraying may include explosive thermal spraying capable of forming a dense thermal sprayed film, thermal spraying with a high-temperature combustion gas, plasma spraying, and the like. Moreover, a sealing process can also be performed as needed.

Brief Description of Drawings FIG. 1A shows a coating head having a tip coated with a cemented carbide together with a member to be coated.

FIG. 1B is a perspective view showing a cross section of a coating head sprayed with a cemented carbide at the tip and shown with a member to be coated.

FIG. 2A is a schematic cross-sectional view showing a state before spraying of the tip of the coating head.

FIG. 2B is a schematic cross-sectional view showing a state after thermal spraying of the tip of the coating head.

FIG. 2C is a schematic cross-sectional view showing a state after polishing of the tip of the coating head.

FIG. 3 is an exploded perspective view showing a detailed structure of a coating head.

FIG. 4A is a cross-sectional view schematically showing an outline of a gun portion of a jet coat used in an example of the present invention.

FIG. 4B is a side view schematically showing an outline of a gun used for jet coating used in an example of the present invention.

FIG. 5A is a diagram showing a data sheet listing the general characteristics of a thermal spray coating suitably used in the present invention.

FIG. 5B is a view showing a data sheet summarizing the characteristics of the thermal spray material (TS-10713) preferably used in the present invention.

FIG. 5C is a diagram showing a data sheet that summarizes the characteristics of the thermal spray material (TS-03084) preferably used in the present invention.

FIG. 5D is a view showing a data sheet summarizing the characteristics of the thermal spray material (TS-1305) preferably used in the present invention.

FIG. 5E is a view showing a data sheet summarizing the characteristics of a thermal spray material (TS-10718) preferably used in the present invention.

FIG. 5F is a view showing a data sheet summarizing characteristics of a thermal spray material (TS — 1301) preferably used in the present invention.

FIG. 5G is a view showing a data sheet summarizing the characteristics of a thermal spray material (TS-3092N) preferably used in the present invention.

FIG. 5H is a view showing a data sheet summarizing the characteristics of a thermal spray material (TS-12006) suitably used in the present invention.

[Fig.51] Data that summarizes the characteristics of thermal spray material (TS _ 11811) that is suitable for the present invention It is a figure which shows a sheet | seat.

FIG. 5J is a view showing a data sheet in which characteristics of a thermal spray material (TS—20142NB) suitably used in the present invention are summarized.

6] A perspective view showing a conventional coating head.

FIG. 7] A perspective view schematically showing scratches formed on the coating head.

Explanation of symbols

20 Dispensing head

21, 22 Split head

21a, 22a Tip

23 Sim

26 Cavity

27 slots

42 Thermal spray coating

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows a cross-sectional view of a coating head including a tip member sprayed with cemented carbide together with a member to be coated schematically. Figures 2A to C show step by step how cemented carbide is processed on the tip of the coating head. FIG. 3 is an exploded perspective view showing the detailed structure of the coating head.

With reference to FIGS. 1A to 3, a coating head for coating the liquid crystal substrate 4 will be described as a preferred example and will be described below. In FIGS. 1A and B, a sheet-like liquid crystal substrate 4 extending in the left-right direction is disposed at the bottom, and a coating head 20 is disposed thereon. The liquid crystal substrate or coating head 20 is relatively moved from right to left (or left to right) in the figure, and the coating film is formed from left to right (or right force left). In FIG. 1A, the force drawn greatly away from the tip of the coating head 20 to the top surface of the liquid crystal substrate 4 for explanation is actually separated by a shorter distance D (for example, 50 to 150 / m). (Figure 1B). Therefore, direct contact or indirect contact between the upper surface of the liquid crystal substrate 4 and the tip of the coating head 20 may occur, and the tip or tip of the coating head 20 may be worn or scratched.

The coating head 20 is composed of divided heads 21 and 22 that face each other at a predetermined interval. Each of the two divided heads 21 and 22 has an elongated rectangular parallelepiped metal (stainless steel) block force. The predetermined distance between the harm ij blocks 21 and 22 can be defined by sandwiching the shim 23. The harm blocks 21 and 22 have substantially parallel opposing surfaces, these surfaces extend substantially vertically downward, and extend substantially horizontally in the width direction of the respective divided blocks 21 and 22. The coating head 20 is provided so as to maintain the respective surfaces that oppose each other with the cutting edge portion protruding downward at an acute angle. That is, the coating head 20 is divided into the divided blocks 21, 2 so that the leading edge of the blade edge becomes the leading edge below the facing surface.

The wall thickness of 2 is gradually getting thinner.

[0023] The leading end portions 21a and 22a of the harm ij blocks 21 and 22 that become the lower end nose portion of the coating head 20 are the width of the liquid crystal substrate 4 (the liquid crystal substrate 4 in the direction orthogonal to the traveling direction of the coating head). The nozzle portion is formed almost horizontally so as to have a length exceeding the length of the nozzle portion. The leading ends 21a and 22a are opposed to each other at a predetermined interval as described above. A uniform coating film can be obtained by allowing the coating material to flow out from the slot 27 having a predetermined interval defined by the tip portions 21a and 22a per unit time (for example, about 2 cc / sec in a general liquid crystal substrate). Form.

[0024] The predetermined interval of the slot 27 can be defined by a shim 23 sandwiched between the harm ij blocks 21, 22. As shown in FIG. 3, the shim 23 is made of a thin plate punched into a U-shape of katakana in a plan view, and the side portions 23a and 23b of the U-shaped recess have two divided heads 21, When shim 23 is sandwiched between 22, a predetermined gap is maintained between these two divided heads 21 and 22. A slot 27 is formed by this gap. The thickness of the shim 23 determines the size of the gap in the slot 27. That is, when the split heads 21 and 22 are fastened by the bolts 60 and nuts 61 as fastening members that pass through the bolt holes 53 of the respective bolt holes 51 and 52 and the shim 23, the thickness of the shim 23 is substantially reduced. This is the gap spacing of the 27.

[0025] A liquid inlet 24 for injecting a liquid or the like that forms a coating liquid (or paint) is provided at the upper part of one of the divided heads 21 in the middle of the width direction (the width direction of the coating head 20). As a result, air vents 34 are formed near both ends in the length direction. These liquid injection port 24 and air vent port 34 are respectively provided in the middle of the split head 21 through the through holes 25. It communicates with the cavity 26 provided in the interior or the interior. The cavity 26 extends in the width direction of the split head 21, and the liquid or the like injected from the liquid injection port 24 flows in the width direction from substantially the center to both ends. At this time, the air remaining in the cavity is exhausted from the air vent 34 through the through hole 25. In this way, the cavity 26 can hold the liquid or the like thus injected in the cavity.

The cavity portion 26 communicates with the slot 27, and the liquid in the cavity portion 26 is made to have a constant thickness by the slot 27 and is discharged from the tip opening portion 28 below the slot 27. The tip opening 28 of the slot 27 forms a nozzle opening of the lower end nose portion of the coating head 20.

[0027] The tip portions 21a and 22a of the opposing surfaces of the divided heads 21 and 22 are each coated with a coating 42 by thermal spraying, so that the surface roughness is fine and the distortion in the width direction is small. Has been. For example, the surface roughness of the sprayed coatings 42a and 42b attached to the tip portions 21a and 22a is measured by JIS, for example, Ra is 0.:! To 0., more preferably 0.

025 to 0.05 m. The slot 27 has a shim thickness of ± 0 · 1 β and a head mating surface within 2 μΐη, with a maximum of 2.1 μΐη or less. Therefore, if the surface roughness or spacing is out of this range, it is not preferable because uniform coating formation becomes difficult. If scratches are made, unevenness in the width direction of the discharged paint tends to occur, and streaks tend to enter the coating film. Therefore, it is difficult to form a uniform coating film. Such scratches are caused by contact or sliding with the surface irregularities of the liquid crystal substrate 4 that is the object to be coated, foreign matter such as contamination on the surface, and solids in the paint during the paint application process. Can happen. In the present embodiment, the coating head edge made of stainless steel is further coated with a cemented carbide by thermal spraying, and scratches such as high hardness are unlikely to occur.

[0028] FIG. 2A to FIG. First, the equipment shape of the division block of the coating head is formed by machining or the like. At this time, it is more preferable that the portions to be thermally sprayed on the coating head blade edge are provided with depressions 44 and 46 in advance to form a thin wall (FIG. 2A). This is because it is difficult to make a step on the outer side 42C or the inner side 42b of the tip.

[0029] When cemented carbide is sprayed onto the depressions 44, 46, etc., the cutting edge portion can have a slightly rounded shape 48 as shown in FIG. 2B. The reason why the thermal spraying is slightly thick is that if it is thin, scratches that cannot be removed by the subsequent polishing process may be formed. At this time, sealing is optional Can be processed. Open holes can be the starting point of scratches and are generally considered effective to prevent unnecessary paint penetration.

[0030] Next, the tip portion is polished and finished to the required shape (FIG. 2C). Further, it is possible to perform a sealing process and perform a precise polishing of the surface again, but this is not an essential requirement. The final spray coating thickness was approximately 0.4 mm. This thickness is preferably 0.2 mm or more, and more preferably 0.3 mm or more. The thickness is preferably 1 mm or less, more preferably 0.8 mm or less. If the thickness is too thin, the wear resistance is sufficient, and if it is too thick, the coating may peel off, and the force will greatly exceed the optimum film thickness to be applied by thermal spraying. The division head 22 is also manufactured in the same procedure, and these are fastened with a bolt or the like through the shim 23 to form an application head.

[0031] By manufacturing in this way, a coating head that does not easily cause scratches can be obtained without causing the coating liquid to enter the joint portion of different materials.

[0032] FIG. 4A shows an HVOF (High Frequency) that can be suitably used in an embodiment of the present invention.

Velocity ○ xy—Fuel) The gun part 100 used in the thermal spraying method is shown in cross section. From the Laval Nozzle, a gas containing a spray material at a high speed of 5 times the speed of sound is sprayed toward the right substrate 112 to form a coating film 114. In this high-speed gas, diamond-shaped objects 110 are arranged in a row and are called “Shock Diamonds 110”. Such a high-speed gas is obtained by sending oxygen and combustion gas (eg, propylene) to the gun portion 100 as shown by arrow 106 and generating high-speed flame by the high-pressure oxygen and propylene combustion gas. It is done. Thermal spray material (powder) is supplied as indicated by the central arrow 104, and heating and melting are accelerated in the center of the frame. The combustion temperature may be 2700 ° C, for example, and its flame speed reaches 1500m / sec. Compressed air is sent as shown by an arrow 108 to protect the nozzle 102 and the like from this high temperature. As described above, since the speed of sound is exceeded, the shock diamond 110 is seen, and the kinetic energy can form a flat sprayed coating on the substrate. Therefore, it has super denseness and finely sprayed skin, and since it has a high density strength, a high bonding strength is obtained, and since it has a low residual stress, it has the feature that the phase change of the substrate is small. [0033] Such a thermal spraying system includes a JET KOTE (jet coat) thermal spraying system. This jet coat is a new high energy gas spraying method developed in the early 1980s at Browing Engineering Co. (USA) against the d-gun of Union Carbide Co. (USA). In particular, the supersonic jet combustion gas flow around Mach 5 enables extremely sharp and high-density powder spraying. Furthermore, it is particularly suitable for spraying carbide-based cermets and superalloy materials, and it is possible to form coatings with higher density and higher adhesion than conventional plasma spraying methods for materials in this field. .

FIG. 4B shows a schematic side view of the jet coat gun. From the tip of the gun barrel 101 extending to the right from the gun body 103, the powder spray material is conveyed to the high-speed combustion gas flow 111, and a coating 114 is formed on the base plate 112. This high-speed combustion gas flow is generated when the combustion gas and oxygen supplied from the combustion gas supply port and the oxygen supply port are burned in the combustion chamber 105. As described above, since the high density and high adhesion force due to the high-speed gas flow are characteristic, the angle between the surface of the substrate 112 and the gas flow is important, and it is desirable that the angle be as perpendicular as possible. Therefore, in order to form sprayed coatings on three orthogonal surfaces as in this embodiment, it is desirable that the above-described gun spraying is performed from the direction suitable for each surface. Specifically, it is preferable to fix the work or gun in an appropriate position and slide one of them in a direction parallel to the substrate surface, if necessary.

FIG. 5A shows a data sheet that summarizes the materials for thermal spraying that are preferably used in the present invention. Some of these materials are suitably used. Broadly divided into two categories: carbide uniform and metal / alloy. It can be seen that the carbide cermet is more suitable for use in the examples of the present invention having relatively low hardness but relatively high hardness. That is, as shown in FIG. 7, since the wear is a so-called abrasive wear such as a pulling force, it is considered that the high hardness contributes greatly. Furthermore, it is difficult for the paint to soak into the paint, which has a porosity of 0.5% or less. In addition, if the paint is corrosive, it is preferable to use one having excellent corrosion resistance.

[0036] Data sheets summarizing more detailed characteristics of each component are shown in Figs. 5B to 5J. From these, or from other preferred materials, or combinations thereof If the above-mentioned thermal spraying is performed using the solder and the tip of the head is subjected to carbide processing, the wear can be greatly reduced, and a great effect can be achieved in the uniform formation of the coating film.

Claims

The scope of the claims

[1] An application head for supplying a coating material to form a coating film on a sheet-like member,

A slot-type application nozzle having a slot extending in a direction substantially perpendicular to the application direction to the sheet-like member, and an application head main body holding the application nozzle,

The application nozzle has two nozzle tips that oppose each other with a predetermined width defining the slot,

A coating head comprising a cemented carbide coating layer formed by thermal spraying on at least a portion facing the sheet-like member or plate-like member of the nose tip member.

[2] The coating head according to claim 1, wherein a substrate of the coating nozzle is made of stainless metal, and the cemented carbide coating layer is formed thereon.

[3] A cemented carbide processing method for a slot-type coating nozzle of a coating head that supplies paint to form a coating film on a sheet-shaped member or plate-shaped member, and after spraying a cemented carbide on the tip of the coating head, A cemented carbide processing method characterized by polishing into a predetermined shape.