JPH108233A - Method for masking in thermal spraying and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To locally form a spray coating on a work with excellent accuracy by covering a part, in which the thermal spraying is unnecessary, of a traveling work to be thermally sprayed by a circulating shield material to perform the thermal spraying, and successively scraping the thermally spraying material adhered to the shield material. SOLUTION: A work 10 to be thermally sprayed is successively moved in the arrow direction by a moving means 11 such as a belt conveyor, and the thermal spraying material is ejected from a thermal spraying means 20 at the thermal spraying position A to form a sprayed coating. Approximately rectangular shield members 30, 31 stretched across four pulleys 32 are driven in the arrow direction to cover a part of the work where the thermal spraying material is unnecessary at the thermal spraying position A. The thermally sprayed work 10 is successively carried out by the moving means 11, and at the same time, the shield members 30, 31 are also moved from the thermal spraying position A to an evacuation position B, unnecessary adhered deposition is successively removed by a scraping means 40, and again circulated to the thermal spraying position A. The thermal spraying can be performed to the work 10 keeping constantly a correct thermal spraying boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for spraying a thermal spray material, and more particularly, to a thermal spray material such as a metal or a ceramic, and injecting the molten thermal spray material toward an object to form a thermal spray material coating. The present invention relates to a method and an apparatus for masking in thermal spraying for shielding an unnecessary portion of a thermal spray material of the thermal object when the thermal spray material is attached to the thermal object.

[0002]

2. Description of the Related Art Conventionally, a thermal spraying method for forming a metal film or the like on an object has been used in various fields. For example, when forming a metal film on the surface of a certain type of workpiece, if the thickness of the film is required in units of 0.1 mm, the thermal spraying method,
It is often used.

[0003]

The above-mentioned thermal spraying method is excellent in forming a film on the whole object, but it is not easy to form a film such as a metal on only a part of the object. . When spraying only a part of the object in this way, a method of narrowing the spray diameter by narrowing the spot diameter of the spray, or a shielding plate that exposes only a part of the object to be sprayed is placed on the object. For example. However, the method for narrowing the spot diameter of the thermal spraying cannot be used when the distribution of thermal spraying is not allowed even slightly outside the spot.On the other hand, the method using the shielding plate, because of the thermal spray coating accumulated on the shielding plate, When spraying multiple objects, the spraying path to the object is disturbed, and there is a disadvantage that the spray boundary gradually becomes inaccurate and the accuracy as a processed product decreases. . Further, as a method of removing the thermal spray coating accumulated on the shielding plate, when performing the thermal spraying work manually, it is possible to remove the thermal spray coating by cleaning the shielding plate once and so on. In thermal spraying, it is impossible to clean the shield plate once. Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to form a sprayed material coating having a high-precision boundary on a part of the surface of the object, thereby eliminating the need for the sprayed material of the object. An object of the present invention is to provide a masking method and apparatus in thermal spraying for automatically scraping and removing a thermal spray material deposit attached to a shielding member when spraying a thermal spray material by shielding a portion with a shielding member.

[0004]

Means for Solving the Problems To solve the above problems, the present invention is configured as follows. According to the masking method in thermal spraying according to one aspect of the present invention, when the thermal spray material is melted and the molten thermal spray material is injected toward the target and the thermal spray material coating is attached to the target, the thermal spraying of the target is performed. In a masking method in thermal spraying for shielding a material unnecessary portion, in thermal spray material spraying, the thermal spray material unnecessary portion of the target is covered with a shielding member at the target spray position, and after the target is sprayed away from the target spray position. Moving the shielding member to the retracted position, scraping and removing the sprayed material deposits attached to the shielding member at the retracted position, and moving the shielding member to the target object spraying position. I do. In the above configuration,
When continuously spraying a plurality of the objects, the shielding member is formed in a belt shape, and the spraying unnecessary portion is covered with the shielding member at the object spraying position for one object, and the thermal spray material is sprayed simultaneously. Unnecessary thermal spray material deposits adhering to the shielding member at the retracted position may be scraped and removed.

[0005] According to the masking apparatus for thermal spraying according to one aspect of the present invention, when the thermal spray material is melted and the molten thermal spray material is injected toward the target to deposit a thermal spray material coating on the target, the thermal spray material is adhered to the target. In a masking apparatus in thermal spraying for shielding an unnecessary portion of a sprayed material of an object, an object spraying position and an object where the sprayed material is sprayed onto the object by the spraying means while covering the unnecessary portion of the object. A shielding member that is moved between a retreat position away from the thermal spraying position, and a scraping unit that scrapes and removes the sprayed material deposit attached to the shielding member at the retreat position. I do. In the above configuration, the surface of the shielding member may be configured to be subjected to a surface treatment in which the thermal spray material deposit is easily attached and easily removed.

In the above structure, the shielding member is a belt that passes through the object spraying position and covers a portion of the object that does not require the sprayed material, and also passes through the retracted position. It may be configured to further include a driving member to be driven. In the above configuration, it may be configured to further include a moving unit that moves the target to the target spray position and retreats the target from the target spray position. Further, in the above configuration, the shielding member is a belt that passes through the target object spraying position and covers a portion of the target object that does not require the sprayed material, and also passes through the retracted position, and constantly drives the belt to travel. The apparatus may further include a driving member and a moving unit that moves the object from the object spraying position to the retreat position at the same time as the belt runs.

[0007]

When the object to be sprayed arrives at the object spraying position, the shielding member is already located at the position, or
After moving to the position from another position, the unnecessary portion of the sprayed material of the object is shielded by the shielding member. Then, the unnecessary portion of the thermal spray material is sprayed on the target object which is shielded by the shielding member. After the completion of the thermal spraying, the shielding member is moved from the target spraying position to the retreat position to remove unnecessary deposits of the thermal spray material adhered to the shielding member, and moved to the target spraying position again to prepare for the next thermal spraying.

[0008]

According to the method and apparatus for masking in thermal spraying according to the present invention described above, an accurate thermal spraying range is always formed on the target by the shielding member, so that a high target is obtained. Partial thermal spray material coating can be formed with high accuracy. In addition, if the shielding member is formed of a belt, there is no need to replace the shielding member even if the size of the object is different, and the versatility is excellent. Further, if the shielding member is always moved between the object spraying position and the retreat position, the shielding member can also be moved while the object is traveling, so that the spraying operation on the object and the deposition on the shielding member can be performed. The object scraping operation can be performed simultaneously, and the thermal spraying efficiency can be increased.
In addition, if the shielding member is continuously supplied to the target spraying position by using a belt-shaped shielding member, the position of the shielding member is particularly considered if the target is positioned at the target spraying position. Spraying can be performed immediately without increasing the spraying efficiency. In addition, the moving direction of the shielding member and the moving direction of the target object are reversed, or the moving speed of the shielding member and the moving speed of the target object are relatively different from each other, so that the moving direction of the shielding member and the target object is over. The sprayed material is less likely to adhere.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of a thermal spray material film forming apparatus as an automatic machine, incorporating a masking method in thermal spraying and an apparatus for performing the method according to one embodiment of the present invention. In the apparatus according to this embodiment, a thermal spray material such as a metal or ceramic is thermal sprayed. As an example, a case in which a metal is thermal sprayed will be described. The masking apparatus in the thermal spraying according to the present embodiment includes a pair of belt-shaped shielding plates 30, which are an example of a shielding member, for a hole or a gap corresponding to a portion to be thermally sprayed in an object 10 to be thermal sprayed.
At the time of metal spraying, the shielding plates 30 and 31 are placed on the object 10 at the object spraying position A, and after the thermal spraying, the shielding plates 30 and 31 are moved away from the object 10 to the retreat position B.
The thermal spray coating on the shielding plates 30 and 31 is removed by scraping or the like. Object 10 to be sprayed
Reaches the range of the thermal spraying means 20 by the moving means 11 such as a belt conveyor. The moving means 11 includes a belt 11a and pulleys 11b and 11 for driving the belt 11a.
The belt 11a is driven by a driving device such as a motor connected to one pulley 11b and moves the object 10 to the object spraying position A.

A portion of the object 10 that does not need to be sprayed other than the portion to be sprayed is masked by first and second belt-like shield plates 30 and 31. Belt-like first and second
The shielding plates 30 and 31 are each stretched by four pulleys 32 so as to constitute a substantially rectangular frame-shaped shielding member. By configuring each of the shielding plates 30 and 31 in a belt shape, it is possible to function as if a large number of shielding members are continuously arranged. At least one pulley 32 of the four pulleys 32 of each shielding plate 30, 31 is connected to a driving device such as a motor, and the other pulleys 32 are rotated to drive the other pulleys 32.
The belt-shaped shielding plates 30 and 3 are guided by the pulleys 32.
1 is driven. The traveling direction of the shielding plates 30 and 31 is the same direction or the opposite direction as the moving direction of the object 10.
Each of the shielding plates 30 and 31 passes through an object spraying position A where the molten metal is sprayed from the spraying means 20 on the object 10 to form a metal film, and a retreat position B which is separated from the object spraying position A. Driven to At the evacuation position B, a scraping means 40 such as a scraper is arranged. The tip of the scraping means 40 is in contact with or close to the shielding plate 40, and the tip of the scraping means 40 scrapes and removes the metal deposit attached to the surface of the shielding plate 30 from the shielding plate 30. To do. A similar scraping means 40 is also arranged on the shielding plate 31, and the metal deposit attached to the surface of the shielding plate 31 is removed by the scraping means 40.

In this embodiment, a belt-shaped shielding plate 30,
31 is arranged in a substantially quadrangular shape, and the thermal spraying means 20 is arranged in the arrangement space of the shielding plates 30 and 31 so as to be compact as a whole. However, the arrangement space of the thermal spraying means 20 is excluded. The shielding plates 30, 31 may be arranged in an arbitrary shape such as a substantially triangular shape. In this embodiment, the left and right ends of the moving means 11 in FIG.
1 so that the shield plates 30 and 31 do not obstruct the transfer of the target object 10 to / from the moving means 11. As an example of spraying a metal on the object 10, there is a case where the object 10 is used as an electronic component and an electrode of the electronic component is formed of the metal to be sprayed. In this case, an example of the metal film is 0.1.
3 mm, zinc is an example of a sprayed metal. A gap of, for example, about 0.5 mm is formed between the lower surface of each of the shielding plates 30 and 31 and the upper surface of the object 10 so that the object 10
It is preferable that the shielding plates 30 and 31 do not hinder the movement of. The object to be sprayed 10 is set within the range of the spraying means 20 by a mechanical method such as a conveyor or a robot. Examples of the thermal spraying means 20 include a plasma thermal spraying apparatus that converts metal into plasma and sprays the same, and an arc spray gun that applies a current to the metal to melt it and spray it by air pressure. As the shielding plates 30 and 31, a metal plate such as iron is usually used, but a ceramic or a heat-resistant resin plate may be used. The shield plates 30 and 31 are driven by the pulley 3 by power.
Rotation around 2, translation between pulleys 32, 32,
Then, after rotating around the pulley 32, the inversion and the like are performed, and the object 10 is moved from the object spraying position to the retreat position on the object 10. During or after the movement, the metal deposits spray-deposited on the shielding plates 30 and 31 are scraped off by the blade-shaped scraping means (scraper) 40 or the physical properties of the shielding plates 30 and 31 and the metal deposits vary. When the belt of the shielding plates 30 and 31 is bent so as to rotate around the pulley 32, the metal deposits are separated from the belt and floated,
Separate and remove metal deposits. The shielding plates 30 and 31
It is necessary to roughen the surface in order to make it easier to deposit a film-like deposit such as a metal on the surface, and it has no affinity with the sprayed metal to make it easier to remove the film-like deposit. It is necessary to do. To satisfy this conflicting demand,
It is preferable that each of the shielding plates 30 and 31 is subjected to a surface treatment. Examples include sandblasting, fine half-etching, or Teflon processing. As an example of the half etching, a circular hole having a diameter of 0.1 mm and a half depth of a half of the thickness of the belt of the shielding plates 30 and 31 is half-etched at a pitch of 0.5 mm, or the belt thickness is 0 mm. .2mm, 0.1mm depth, 0.5mm diameter
May be half-etched at a pitch of 1 mm. Examples of the sand blast include GBB blasted with glass beads.

According to the above configuration, a plurality of objects 10 are placed on the belt 11a of the moving means 11, and the objects 10 travel on the belt 11a from the loading position at one end to the unloading position at the other end of the moving means 11. Let it. At this time, the target 10 is made to continuously pass through the target spray position A. On the other hand, at the same time as the object 10 travels so as to pass through the object spraying position A,
At both ends other than the center of the object 10 on 1a, the shielding plates 3
The shield plates 30, 31 are run as indicated by arrows in FIG. Therefore, in a state where the unnecessary portion of the object 10 is shielded by the shielding plates 30 and 31 at the object spraying position A, the molten metal is sprayed from the thermal spraying means 20 to the central portion which is the exposed portion of the object 10 and the metal is sprayed. To form a film,
Thereafter, the object 10 is carried out by the moving means 11.
At this time, the shielding plates 30 and 31 are simultaneously moved from the object spraying position A to the retreat position B, and unnecessary metal deposits on the shielding plates 30 and 31 are sequentially scraped off by the scraping means 40 and removed. You. Since the shielding plates 30 and 31 are constituted by belts, unnecessary metal deposits formed by spraying at the target spraying position A are moved to the retreat position B, and at the same time, the next target 10 is sprayed. When located at the position A, a portion without unnecessary metal deposits is located at the target spraying position A, and can function as a shielding member.

According to the above embodiment, the object 10 to be sprayed is masked by the belt-shaped shielding plates 30 and 31, and after the metal spraying, the shielding plates 30 and 31 are moved from the object spraying position to the retreat position. By removing the metal by the scraping means 40, the sprayed boundary of the object 10 can always be kept accurately. Further, since the belt-shaped shielding plates 30 and 31 always travel between the object spraying position A and the retreat position B, the shielding plates 30 and 31 also travel while the object 10 travels by the moving means 11. Object 1
The spraying operation for zero and the scraping operation by the scraping means 40 can be performed simultaneously, and the metal spraying efficiency can be increased. Also, belt-shaped shielding plates 30, 31
Since the shielding member is continuously supplied to the target spraying position A by the above, if the target 10 is positioned at the target spraying position A, the positions of the shielding plates 30 and 31 are not particularly taken into consideration.
The thermal spraying by the thermal spraying means 20 can be performed immediately, and the thermal spraying efficiency can be improved. Further, since the shielding member is constituted by the belt-shaped shielding plates 30, 31, there is no need to replace the shielding plates 30, 31 even if the size of the object 10 is large or small, and the versatility is excellent. Further, the moving direction of the shielding plates 30 and 31 and the moving direction of the moving object 11 of the object 10 are reversed, or the moving speed of the shielding plates 30 and 31 and the moving speed of the moving device 11 of the object 10 are changed. By making them relatively different, the spray metal or the like hardly adheres over the shielding plates 30 and 31 and the object 10.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a thermal spraying operation by an apparatus for performing a masking method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spraying object 11 Spraying object moving means 11a Belt 11b Pulley 20 Spraying means 30 First shielding plate 31 Second shielding plate 32 Pulley for moving shielding plate 40 Removal means for scraping off the sprayed metal film on the shielding plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Saeki 1006 Kazuma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A thermal spraying method for melting a thermal sprayed material and injecting the molten thermal sprayed material toward an object (10) to adhere a thermal sprayed material film to the object. In the masking method according to the above, at the time of spraying the thermal spraying material, the unnecessary portion of the thermal spraying material of the object is covered with a shielding member (30, 31) at the thermal spraying position of the object, and after the thermal spraying on the thermal object, retreating away from the thermal spraying position of the thermal object Wherein the shielding member is moved to a position, the thermal spray material deposits attached to the shielding member are scraped off at the retreat position, and the shielding member is moved to the target object spraying position. Masking method in. 2. When spraying a plurality of said objects continuously, said shielding member is formed in a belt shape, and a portion of one object which does not need to be sprayed at said object spraying position is covered with said shielding member. 2. The masking method according to claim 1, wherein unnecessary thermal spray material deposits adhering to the shielding member are scraped off at the retracted position at the same time as the thermal spraying is performed. 3. A thermal spraying method that melts a thermal spray material and injects the molten thermal spray material toward an object (10) to adhere a thermal spray material coating to the object, thereby spraying a portion of the object that does not require the thermal spray material. In the masking device according to the above, while covering the unnecessary portion of the sprayed material of the object, between the object sprayed position where the molten sprayed material is sprayed to the object by the spraying means and a retracted position away from the object sprayed position And a scraping means (40) for scraping and removing the sprayed material deposits attached to the shielding member at the retracted position. Masking equipment in 4. The masking apparatus according to claim 3, wherein the surface of the shielding member is subjected to a surface treatment that makes it easy to attach the thermal spray material deposit and to easily scrape and remove the deposit. 5. The shielding member is a belt (30, 31) that passes through the object spraying position and covers a portion of the object that does not require sprayed material, and also passes through the retreat position. The masking device according to claim 3 or 4, further comprising a driving member (32) for driving. 6. A moving means (11, 12) for moving the object to the object spraying position and retracting the object from the object spraying position. The masking device according to claim 1. 7. The belt (30, 31), which passes through the target spraying position and covers a portion of the target that does not require a sprayed material, and also passes through the retreat position. A driving member (32) for driving the traveling;
A moving means (11, 12) for moving the object from the object spraying position to the retracted position at the same time as moving the belt, further comprising a moving means (11, 12). The masking device according to claim 1.