JP2011000601A - Powder facing agent applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder facing agent applicator capable of forming a coating film excellent in uniformity and adhesion and has high film strength by blowing the powder facing agent into the inner mold face of a mod even if a cavity surrounded by the inner mold face of the mold in a closed state is bent.SOLUTION: A tube 17 composed of a cylindrical hollow flexible member supporting a facing nozzle 12 is bend by wires 43, 44 along a bent cavity shape in a mold, and the facing nozzle 12 is progressed into the cavity in such a manner that the facing nozzle 12 does not abut on the inner mold face of the mold. During the progress of the facing nozzle 12, a powder facing agent 60 is discharged from the facing nozzle 12 to a deflector 11 during rotation, and the powder facing agent 60 deflected by the deflector 11 is applied to the inner mold face.

Description

  The present invention provides a powder in which a powder coating agent is applied to the inner mold surface of the mold by the KY method while the core mold (in particular, the shell core mold) is closed. The present invention relates to a coating agent coating apparatus.

  Patent Document 1 discloses that a coating agent can be discharged without limiting to a gun (in this specification, a general gun (gun) form) with the core molding die closed. The discharge means including the nozzle is broadly defined. The same applies hereinafter.) The powder coating agent is sprayed substantially perpendicularly to the inner mold surface of the mold from a nozzle provided with a deflector at the discharge destination of the powder coating agent. It discloses about application | coating by KY method in which a suitable coating film is obtained by this. (The “KY method” is a method proposed by Komatsu Ltd., which is a combination of spray coating and shell molding methods. See Patent Document 2).

However, according to the method shown in Patent Document 1 (see FIG. 5 in particular), in the case of an inner mold having a complicated structure in which one or more cavities formed by the inner mold surface are bent, It became difficult for the mold to spray from the coating nozzle substantially perpendicularly to the inner mold surface, and a uniform coating film having excellent adhesion was not formed on the inner mold surface.
Therefore, at the core manufacturing site, the mold must be opened, and the core must be molded by manually spraying the powder coating agent with a gun, approximately perpendicular to both the inner mold surfaces of the mold. There wasn't.

Japanese Patent Laid-Open No. 62-64452 Japanese Patent Publication No. 51-43813

  However, it is possible to obtain a coating film with excellent adhesion and high film strength, as well as many beneficial effects such as saving labor for core molding work and environmental safety. Even if the shape of the inner mold surface of the mold is complicated, it is desirable to automatically blow the powder coating agent from the gun almost perpendicularly to the inner mold surface with the mold closed. There was still a request.

  Therefore, the present invention, even if the shape of the inner mold surface in the core mold is a complicated one or more cavities in the mold are bent, with the mold closed, It is an object of the present invention to provide a powder coating agent coating apparatus capable of forming a coating film having excellent adhesion, uniform and high film strength on the entire inner mold surface of a mold.

(Aspect of the Invention)
Hereinafter, embodiments of the invention will be shown and described. The items (1), (2), (3), (4) and (5) correspond to claims 1, 2, 3, 4 and 5. .

(1) A powder coating agent applicator for applying a powder coating agent from a gun to an inner mold surface of a core molding die in a closed state, wherein the powder coating agent from the gun A coating mold comprising a powder coating agent supply tube capable of discharging a mold agent, and a cylindrical hollow flexible member disposed around the powder coating agent supply tube and bendable in three dimensions The end of the first wire is fixed to the nozzle and the portion to be bent of the cylindrical hollow flexible member, and the first end of the first hollow portion is fixed to any portion of the bent portion of the cylindrical hollow flexible member in the radial direction. A bending means including a wire drive unit capable of bending the coating nozzle by pulling the second wire while fixing the ends of the two wires and maintaining the tension of the first wire; Arranged at the tip of the mold nozzle and the powder A deflector capable of deflecting and rotating the discharge direction of the powder coating agent discharged from the opening of the mold supply tube so that the powder coating agent hits substantially perpendicularly to the surface of the inner mold A powder coating agent coating apparatus comprising:

According to this section, even if the cavity formed in the mold is bent with the core molding die closed, the bending means along the bent cavity by the bending means, The coating nozzle can be bent, and the powder coating agent can be blown into the cavity surface (inner mold surface) substantially perpendicularly from a rotatable deflector provided at the tip of the coating nozzle.
As a result, the work of manually blowing the powder coating agent into the cavity surface (inner mold surface) manually while the core mold is open has been saved, and the adhesiveness is excellent. Uniform and high film strength core-forming coatings can be formed. This, in turn, makes it possible to reduce the surface roughness of a cast product produced by casting a metal into a molded core.

(2) The end of the first wire is fixed to a portion to be bent of the cylindrical hollow flexible member, and the powder coating mold is a radially opposite portion of the cylindrical hollow flexible member at the bent portion. The powder coating agent applicator according to (1), wherein an end of the second wire is fixed at any downstream position where the agent is supplied.
According to this section, the cylindrical hollow flexible member fixes the end of the first wire, and the powder coating agent is a portion of the bent portion facing the radial direction of the cylindrical hollow flexible member. Since the end of the second wire is fixed at any location downstream of the supply, the two wires are appropriately pulled by using power means such as an air cylinder or a motor motor described later, The coating nozzle can be bent at an arbitrary angle at a desired position.

(3) The deflector is a conical body, a conical axis of symmetry is coupled to a motor shaft, and is arranged so as to substantially coincide with a central axis of the powder coating agent supply tube. The powder coating agent coating apparatus according to item (1) or (2), wherein
This section illustrates the deflector structure of the section (1) or (2). The deflector is a cone, and more preferably a regular cone. This is because if the rotation is eccentric during rotation, the rotation operation becomes unstable and the discharge direction of the powder coating agent is not stable. In addition, when a regular cone is used, it is difficult to receive wind pressure during rotation, and an unnecessary load is not received.

(4) The deflector has a conical shape, and the symmetrical axis of the conical shape is coupled to the motor shaft and arranged so as to substantially coincide with the central axis of the powder coating agent supply tube. The powder coating agent coating apparatus according to (1) or (2), wherein the cone-shaped bottom surface forms a semi-doughnut-shaped curved surface having the central axis as a symmetry axis .

  This section illustrates another deflector structure of (1) or (2). In the deflector, a conical bottom surface forms a semi-doughnut-shaped curved surface with the central axis as a symmetry axis. Therefore, while the powder coating agent is discharged in a direction perpendicular to the axis of symmetry (rotation axis), the powder coating agent can be blown into the inner mold surface so as to bend from the vertical direction. . This is effective when the inner surface is a complicated surface formed in a zigzag shape with a constant angle.

(5) The deflector is a propeller body with a rotating shaft, and the rotating shaft is coupled to a motor shaft and disposed so as to substantially coincide with the central axis of the powder coating agent supply tube. The powder coating agent coating apparatus according to item (1) or (2), wherein

This section illustrates another deflector structure of (1) or (2). The deflector is a propeller body with a rotating shaft. Therefore, it is suitable when the powder coating agent discharge target is in front of the central axis of the powder coating agent supply tube. This is because if the deflector is a propeller body with a rotating shaft, the powder coating agent can be blown into the inner mold surface so as to spread around the direction along the central axis (congestively).
The deflector is not limited to the item (3), (4) or (5), and can be appropriately modified by those skilled in the art.

  According to the present invention, even if the cavity in the mold in the closed state is bent, the powder coating agent can be blown into the cavity surface (inner mold surface). It is possible to form a coating film having uniform properties and high film strength.

It is the schematic for demonstrating the whole system of the powder coating agent coating device which concerns on this invention. It is a figure explaining the bellows-like tube contained in the nozzle mechanism with a deflector. It is the figure which put the sleeve made from Teflon (trademark) on the bellows-like tube of FIG.2 (c). It is a figure which shows that even if it is a case where the cavity in a metal mold | die is bent, the powder coating agent coating device which concerns on this invention is used suitably. FIG. 5 is a partial bird's-eye view of FIG. 4, showing a state in which a powder coating agent is applied to an inner mold surface at a bending destination. (A) is a photograph of the core molded by the comparative example, and (b) is a photograph of the core molded by the embodiment. (A) is a photograph of a cast article obtained by casting a metal into a core molded according to a comparative example, and (b) is a cast article obtained by casting a metal into a core molded according to an example. It is a photograph. (A) is a cast article obtained by casting a metal into a core molded according to the comparative example, a cast article obtained by honing this conventional cast article, and a metal molded into the core molded according to the example. It is a graph which compares the surface roughness with the cast article obtained by casting. (B) is a graph which shows the flow coefficient when flowing a fluid through each of the castings of the comparative example and the same example. It is sectional drawing which shows the discharge direction of the deflector and powder coating agent of a regular cone. It is sectional drawing which shows the discharge direction of the deflector and powder coating agent in which the half donut-shaped recessed part was formed in the bottom face of a regular cone. It is sectional drawing which shows the discharge direction of the deflector and powder coating agent of a propeller body (when a propeller rotates so that a wind may blow forward). It is sectional drawing which shows the discharge direction of the deflector of a propeller body, and a powder coating agent (when the rotation of a propeller is made into the opposite direction in the case of FIG. 11). It is the schematic which shows the modification at the time of applying a coolant liner to a coating type nozzle. It is a schematic elevation view which shows the modification at the time of applying a spring member to a coating type nozzle (especially front-end | tip part). It is a schematic elevation view which shows the modification at the time of applying the flexible tube which inserted the spring member to the coating type nozzle.

  Hereinafter, referring to FIG. 1, a preferred embodiment (hereinafter referred to as “this embodiment”) of a powder coating agent coating apparatus according to the present invention is represented by a case where the coating method is electrostatic coating (electrostatic coating). This will be described as an example. However, this embodiment is not limited to electrostatic coating, and spray coating can also be applied. For example, when spray coating is employed, instead of the electrostatic powder coating type supply mechanism 50 described below, a spray coating mechanism using air pressure may be provided. In such a case, a device or means for applying static electricity. Is not required.

FIG. 1 schematically shows the entire system of a powder coating agent coating apparatus 100. As shown in FIG. 1, the system of the powder coating agent coating apparatus 100 includes a nozzle mechanism 10 with a deflector, a nozzle tip rotating mechanism 20, a linear drive mechanism 30, a coating nozzle bending mechanism 40, and electrostatic powder. A coating mold supply mechanism 50 is provided.
The deflector-equipped nozzle mechanism 10 includes a deflector 11 integrally coupled to a rotary shaft 13 driven by a motor 21 and a coating nozzle 12 that can be bent at one or more locations. The deflector 11 is preferably a regular cone, and the rotation shaft 13 and the central axis of the regular cone are on the same axis.

  The nozzle tip rotation mechanism 20 includes a motor 21 and a wire 23 that can transmit the rotation operation of the motor 21 in the tube via a coupling member 23 disposed on the rotation shaft of the motor 21. The wire 23 is coupled to the rotating shaft 13 of the deflector 11 through the central opening of the coating nozzle 12.

  The linear drive mechanism 30 linearly drives the coating nozzle 12 in the directions of arrows 32A and 32B along the extension line of the support 51S that is an extension of the powder coating agent discharge part 51A of the electrostatic gun 51. A possible air cylinder unit 31 is included. Further, the angle at which the coating nozzle 12 is inserted into the cavities 58 of the molds 60 and 61 shown in FIG. 4 can be varied by the linear drive mechanism 30 in the range of 0 to 45 degrees, and the insertion position can be changed. , 61 can be adjusted while being moved parallel to the dividing surface 59. Furthermore, the insertion length can be adjusted depending on the shape of the cavity 58 of the molds 60 and 61. The above driving / adjustment is performed by compressed air applied to the air cylinder. By adjusting the amount of compressed air (or air pressure), the moving speed (driving speed) of the coating nozzle 12 can be varied.

The coating-type nozzle bending mechanism 40 includes two air cylinders 41 and 42, and the ends of the two wires 43 and 44 are fixed to the drive portions of the air cylinders 41 and 42. The wires 43 and 44 are arranged around the bellows-like tube 17 (adjacent to the powder coating agent supply tube in the above (1), extending adjacent to the inside of the tube-like coating nozzle 12, and A groove formed along a three-dimensionally bendable cylindrical hollow flexible member), a wire passing through a groove that can be snapped into, and a tip of the slit (described in FIG. 2). Reference numeral 15) is fixed. In the present embodiment, the case where there is one bent portion is illustrated, but when there are two or more bent portions, two air cylinders and two wires are further added in one set unit. .
In the present embodiment, the sleeve 18 is provided in order to prevent dust from adhering to the bellows-like tube 17 to prevent the bending from being performed smoothly, or to prevent the wire from coming out of the groove ( However, since the sleeve 18 does not contribute to the bending operation itself, it is not essential).

  The electrostatic powder coating type supply mechanism 50 includes an electrostatic gun 51, an air pressure control unit 52, a powder coating agent storage unit 53, and a voltage control unit 54. The electrostatic gun 51, the air pressure control unit 52, and the powder coating agent storage unit 53 are connected by tube members 55 and 56, and the electrostatic gun 51 and the voltage control unit 54 are connected to each other. A wire (conductive wire) 57 is connected to be energized. The voltage control unit 54 variably controls the applied voltage for applying a charge to the powder coating material discharged from the electrostatic gun 51.

  Next, the system of the powder coating agent coating apparatus 100 electrostatically applies the powder coating agent to the inner mold surfaces of the pair of molds 60 and 61 shown in FIG. The operation of the system when molding is explained.

First, a pair of molds 60 and 61 (reference numeral 59 indicates a dividing surface of both molds) are closed, and an inner mold surface or cavity corresponding to the outer shape of the core to be formed between the molds 60 and 61. Form. A voltage is supplied from the voltage control unit 54 so that the powder coating agent is positively charged and the mold is negatively charged.
Next, the air cylinder 31 included in the linear drive mechanism 30 is driven in the direction of the arrow 32A in FIG. 1, and the coating nozzle 12 is moved straight in the cavity 58 in FIG. 4 while keeping the coating nozzle 12 straight. While proceeding along the part 12L, the blowing of the powder coating agent is started. Note that a release agent may be applied in advance to the inner mold surfaces of the molds 60 and 61 before the powder coating agent is blown.

The cavity 58 as shown in FIG. 4 has a bent portion 12B near the tip (near the back), and the deflector 11 collides with the surface of the cavity 58 as it proceeds. In order to prevent this, the wire 43, 44 connected to each of the air cylinders 41, 42 of the coating nozzle bending mechanism 40 is remotely controlled by pulling the air cylinders 41, 42, and the shape of the cavity 58 where the tip portion is bent The coating nozzle 12 is bent so that At this time, it is preferable to set a limiter in advance in the air cylinders 41 and 42 in order to prevent the deflector 11 from proceeding further and colliding with the cavity 58 surface.
The bending operation of the coating nozzle 12 will be described later with the structure and operation of the bellows-like tube 17 as the center of explanation.

Further, the powder coating agent 70 positively charged by the voltage control unit 57 and accelerated by the air pressure by the air pressure control unit 52 is directed from the electrostatic gun 51 in the direction of reference numeral 19 so that the deflector 11 Dispense toward the surface. At the same time, the deflector 11 is rotated by rotating the motor 21 of the nozzle tip rotating mechanism 20. Thereby, as shown in FIG. 5, the powder coating agent can be discharged in a direction perpendicular to the rotating shaft 13 of the deflector 11, and the powder coating mold is perpendicular to the inner mold surfaces 62 and 63. The agent can be blown. As a result, according to the present embodiment, the powder coating agent is uniformly adhered to the inner mold surfaces 62 and 63 at the back of the bent portion 12B as shown in FIG. It can apply | coat so that it may become high.
The front surface portion 58F of the inner mold surface where the extension line of the rotating shaft of the deflector 11 abuts is not used as a cavity surface, but is generally used for a so-called “baseboard”, and when the core is set in a mold It becomes the seat part. Therefore, the coating quality of the coating agent for the front portion 58F is not limited, and the coating agent may not be applied to the front portion 58F at all. If the quality of the coating film is questioned, the shape and mold structure of the deflector 11 can be modified. In addition, although not shown in the figure, the front surface portion 58F (the portion corresponding to the baseboard) of the inner mold surface shows that the coating agent soars in the cavity when spraying the coating agent (during application of the coating agent). In order to suppress it, a through-hole through which the spray-type coating agent is appropriately released to the outside can be provided in the front portion 58F.

Further, the coating nozzle 12 is gradually moved in the direction of the arrow 32B by the air cylinder unit 31. At the same time, the application nozzle 12 is gradually straightened by driving the air cylinders 41 and 44. In this way, the application nozzle 12 is removed from the cavities of the molds 60 and 61.
Thus, according to this embodiment, the powder coating agent is excellent over the entire inner mold surface having a complicated structure in which the cavity is bent, with the mold closed. It can be sprayed and applied uniformly with high adhesion. Thereafter, the molded cores can be obtained by opening the dies 60 and 61 with the dividing surface 11 as a boundary.

Here, the bending mechanism of the coating nozzle 12 (coating nozzle bending mechanism 40) will be described in detail with reference mainly to FIGS.
The coating nozzle 12 (see FIG. 1) has a three-layer structure. In this three-layer structure, the outermost layer is a Teflon (registered trademark) resin sleeve (reference numeral 18 in FIG. 3), the intermediate layer is a bellows-like tube (reference numeral 17 in FIG. 2), and the innermost layer is a powder coating agent. Is made of a powder coating agent tube (reference numeral 16 in the figure). The innermost layer powder coating agent tube is preferably a fluororubber tube.

  As shown in FIGS. 2A to 2C, the bellows-like tube 17 of the intermediate layer has a concavo-convex shape (a bowl shape) including a concave portion 17A and a convex portion 17B. Includes a continuous structure of patterns. Although not shown, the wires 17 and 44 can be snap-fitted along the longitudinal direction of the coating nozzle 12 (preferably the cross section is a keyhole type), as shown in FIG. A very small groove (not shown) is linearly formed along the longitudinal direction. And bean granular locking members 15A and 15B larger than the minimum diameter of the tube groove are provided at the ends of the wires 43 and 44, respectively. Then, as shown in FIG. 2 (b), first, the locking member 15B is arranged at a position where it is desired to bend, and the wire 43 is snap-fitted into the tube groove. On the opposite side, for example, the locking member 15A is disposed at a position near the nozzle discharge port 19, and the wire 44 is similarly snap-fitted into the tube groove.

  In this state, the air cylinder 42 maintains the tension applied to the wire 44 so that the position of the locking member 15B does not move. On the other hand, the wire 43 is pulled by the air cylinder 41 toward the air cylinder 41. Then, the bellows-like tube 17 is bent so that the arrangement position of the locking member 15B becomes the starting point of bending and warps upward on the paper surface as shown in FIG. After that, even after the driving of the air cylinders 41 and 42 is stopped, the bellows-like tube 17 is fixed in the bent state, and the bent state as shown in FIG. 3 is maintained.

  In this manner, the coating nozzle 12 is moved so as to bend gradually from where it enters the bent portion 12B of FIG. 4 so as to substantially match the bent state of the cavity formed by the combination of the molds 60 and 61. Bending and controlling (At this time, preferably, the operation related to the bending and controlling is stored by a storage means (not shown)). As a result, as shown in the figure, the powder coating agent can be blown into the inner mold surfaces 62 and 63 (see FIG. 5) in the deep cavity portion. Can be achieved.

  Then, after the discharge of the coating powder and the rotation of the deflector 11 are stopped, the air cylinders 41 and 42 and the wires 43 and 44 are preferably traced back so as to reversely operate the bending control stored by the storage unit. By controlling, the coating nozzle 12 is removed from the cavities of the molds 60 and 61 without colliding with the inner mold surface. After the coating nozzle 12 is inserted into the cavities of the molds 60 and 61, when the coating nozzle 12 is removed from the cavities of the molds 60 and 61, the discharge of the coating powder is performed within the dies 60 and 61. It may be performed on the mold surface to complete the coating operation.

Thus, according to the present embodiment, the inner mold surface of the core mold including the bent cavity is formed over the entire inner mold surface with the mold closed. The powder coating agent can be blown perpendicularly to the film, so that a uniform coating film having excellent adhesion and high film strength can be formed.
Further, the film thickness and / or film strength of the coating film are determined by supplying the powder coating agent supply amount and air pressure from the electrostatic powder coating and supplying mechanism 50, the moving speed of the air cylinder 31 of the powder nozzle 12, and It can be controlled by the rotational speed of the deflector 13.

[Comparative Examples / Examples]
In the comparative example, with the mold opened, the powder coating agent was applied to the inner mold surface of the mold manually using an electrostatic gun by electrostatic coating, and observed with the photograph in FIG. 6 (a). Got a core. On the other hand, in the examples, with the mold closed, the powder coating agent is applied to the inner mold surface of the mold by electrostatic coating by the system of the powder coating agent coating apparatus according to the present embodiment, The core observed in the photograph of FIG. 6 (b) was obtained.

  6 (a) and 6 (b), the mold used was a cast article related to an IN port around the engine (hereinafter simply referred to as “IN port”), and the cavity shape was bent. As can be seen from the photographs of FIGS. 6 (a) and 6 (b), the mold was such that the cavity shape was bent outward along the plane of the paper.

From the top of the core obtained above, molten metal was cast under the same conditions, and IN port cast articles (semi-finished products) observed in the photographs shown in FIGS. 7A and 7B, respectively, were obtained.
When the inner surfaces of both IN port cast articles are compared between the photograph of FIG. 7A indicating the comparative example and the photograph of FIG. 7B indicating the example, the example is clearly more than the comparative example. It was found that the inner surface of the cast article was glossy, that is, the surface roughness was small. As can be seen from the observation of the photographs in FIGS. 6 (a) and 6 (b), the surface of the core obtained by the example, that is, the surface roughness of the surface formed of the coating film formed by the powder coating agent. This is because the powder coating agent was applied uniformly and with high film strength with excellent adhesion to the inner mold surface of the mold according to this embodiment.

  FIG. 8A is a graph in which the surface roughness of the cast product [port surface roughness (Z): surface roughness Rz of the surface without IN port] is actually measured by a surface roughness meter. It is. Comparative example 1 corresponds to the left bar graph (comparative example 1) in FIG. 8A, and the example corresponds to the right bar graph (example) in FIG. 8A. The bar graph at the center of FIG. 8A is the surface roughness of the surface of the cast product of Comparative Example 1 (referred to as Comparative Example 2).

  From the result of FIG. 8A, the surface roughness of the cast product of the example is about 1/7 of the surface roughness of the cast product of Comparative Example 1 and the surface after the honing process of Comparative Example 2 It was equivalent to roughness. From this result, if the powder coating agent is applied to the inner mold surface of the closed mold by the powder coating agent coating apparatus 100 according to the present invention to form a core, a metal is applied to the core. It has been found that it is possible to produce a cast product having such a small surface roughness that it is not necessary to perform post-processing (surface adjustment) such as honing on the cast surface.

  FIG. 8B is a graph comparing the flow coefficient of the IN port casting of Comparative Example 1 and the IN port casting of the above Example. The flow coefficient of Comparative Example 1 was 0.546, but the flow coefficient of the Example was 0.565. The larger the flow coefficient, the better the fluid flows in the IN port casting. Since the casting obtained by the powder coating agent coating apparatus 100 according to the present invention has a large flow coefficient, the surface thereof is the same as the honing surface.

  Thereby, according to the Example which concerns on this invention, in order to make the surface roughness of the inner surface of IN port cast goods small, surface adjustment like the honing process conventionally required can be skipped, and labor saving of a manufacturing process It turned out that it can plan.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention. For example, the following modifications can be adopted for the deflector 11 and the coating nozzle 12.

  The deflector 11 has, for example, a shape 11A in which the bottom surface of the shape A shown in FIG. 10 is formed into a half donut (semi-annular) shape, or the propeller 11B shown in FIG. Any one of the propellers 11C rotated in the reverse direction to the rotation of the propeller 11A shown in FIG. 12 may be employed. The above-described deflectors 11A, 11B, and 11C include an inner mold surface and a deflector 11 in which the powder coating agent cannot be blown by the deflector 11 when the powder nozzle 12 is bent in view of the cavity shape in the mold. It can employ | adopt suitably for blowing of a powder coating agent to the location of a rotating shaft of the front direction.

  Further, the bellows-like tube 17 may use a commercially available coolant liner nozzle tube portion 17A (coolant liner 17A) shown in FIG. In this case, the end portions of the two wires 43 and 44 are appropriately fixed to the locking portions E1 and E2 on the side wall of the coolant liner 17A. Then, by appropriately pulling the wires 43 and 44 by the air cylinders 41 and 42 of the tube portion 17 of the coolant liner, the coating nozzle 12 can be appropriately bent (the direction of the deflector 11 can be arbitrarily changed).

  Further, the bellows-like tube 17 may use a structure 16S including a spring shown in FIG. 14 instead. In the spring structure 16 </ b> S shown in FIG. 14, the spring member 16 </ b> S is fixed to the tip E of the coating nozzle 12, and the coating nozzle 12 and the spring member 16 </ b> S are coaxially fixed. A rigid disk D having a diameter slightly larger than the spring diameter is fixed to the distal end surface of the spring member 16S so as to be perpendicular to the central axis. The powder coating agent tube 16 is passed through the center of the disk D, and the deflector 11 is provided on a rotating shaft extending from the through hole along the central axis of the distal end surface P of the spring member 16S. In addition, two wires 43 and 44 are fixed to the flat plate D with the central axis as the axis of symmetry. In this case, the spring member 16 </ b> S can be appropriately bent, particularly the tip portion of the coating nozzle 12, by appropriately pulling the wires 43 and 44 by the air cylinders 41 and 42.

  Alternatively, the bellows-like tube 17 may use a hollow flexible member 16U made of a flexible resin (for example, a somewhat rigid urethane resin) in which a spring 16S shown in FIG. 15 is inserted. In this case, the ends of the wires 43 and 44 are fixed to any gaps E3 and E4 that are formed when the spring 16S is extended. Also in this case, the coating nozzle 12 can be suitably bent by the spring member 16S by appropriately pulling the wires 43, 44 in the same manner by the air cylinders 41, 42.

11: Deflector, 15B: bent portion, 17: bellows-like tube (cylindrical hollow flexible member), 43: first wire, 44: second wire, 51: electrostatic gun, 70: powder coating agent, 100: Powder coating agent coating device

Claims (5)

A powder coating agent application device for applying a powder coating agent from a gun to an inner mold surface of a core molding die in a closed state,
A powder coating agent supply tube capable of discharging the powder coating agent from the gun, and a cylindrical shape disposed around the powder coating agent supply tube and bendable in three dimensions A hollow type flexible member, and a coating nozzle comprising:
The end of the first wire is fixed at a position where the cylindrical hollow flexible member is to be bent, and the second end of the bent portion is located at one of the radially opposing portions of the cylindrical hollow flexible member. Fix the end of the wire,
Bending means including a wire driving unit capable of bending the coating nozzle by pulling the second wire while maintaining the tension of the first wire;
The discharge direction of the powder coating agent disposed at the tip of the coating nozzle and discharged from the opening of the powder coating agent supply tube is set substantially perpendicular to the surface of the inner mold. A deflector that can be deflected and rotated so that the body coating agent hits,
A powder coating agent applicator characterized by comprising:   The end of the first wire is fixed to a portion to be bent of the cylindrical hollow flexible member, and a powder coating agent is supplied at the bending portion at a radially opposite portion of the cylindrical hollow flexible member. 2. The powder coating agent coating apparatus according to claim 1, wherein the end of the second wire is fixed at any downstream position.   The deflector is a cone, and a cone-shaped symmetry axis is coupled to a motor shaft and arranged so as to substantially coincide with a central axis of the powder coating agent supply tube. The powder coating agent coating apparatus according to claim 1 or 2, characterized in that   The deflector has a conical shape, a conical axis of symmetry is coupled to a motor shaft, and is disposed so as to substantially coincide with a central axis of the powder coating agent supply tube; and 3. The powder coating agent coating apparatus according to claim 1, wherein the cone-shaped bottom surface forms a semi-annular curved surface having the central axis as a symmetry axis. 4.   The deflector is a propeller body with a rotating shaft, and the rotating shaft is coupled to a motor shaft and disposed so as to substantially coincide with the central axis of the powder coating agent supply tube. The powder coating agent coating apparatus according to claim 1 or 2.