JPH09295267A - Blast gun device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a wear resistance by covering the room wall of a negative pressure room with a raw material excellent in the wear resistance. SOLUTION: A Y-shape blast gun main body 1 having an air introduction port 6 in which a high pressure air is introduced and a polishing material introduction port 7 in which a polishing material 9 is introduced is formed of an aluminum alloy casting. An ejector nozzle 3 for jetting the high pressure air is provided in the air introduction port 6 side. A negative pressure room 5 is formed so as to surround a negative pressure part formed on the back part of the jet port 33 provided on the tip of the ejector nozzle 3. A protection layer 2 is provided on the room wall of this negative pressure room 5. This protection layer 2 is formed of a metal liner excellent in wear resistance. A blast gun nozzle 4 is provided on the tip of the blast gun main body 1 and the tip of the ejector nozzle 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast gun device for injecting a fine-powdered abrasive material toward a workpiece (work), and particularly to a chamber of a negative pressure chamber of a blast gun body. The present invention relates to a device for improving wear resistance around a wall.

[0002]

2. Description of the Related Art A conventional blast gun is made of, for example, an aluminum alloy casting as shown in FIG. 2, and has an air introducing port 60 into which high pressure air is introduced and an abrasive material into which an abrasive material is introduced. Based on the Y-shaped blast gun main body 10 having the port 70, the blast gun nozzle 20 made of boron steel provided at the tip of the blast gun main body 10 is attached from the air introduction port 60 side. The ejector nozzle 30 for injecting high-pressure air from the air introduction port 60 side. In such a structure, when high-pressure air is jetted from the tip end opening portion (jet port) 330 of the ejector nozzle 30, the jet port 330 is thereby generated.
Negative pressure will be generated on the back surface of the. That is, the negative pressure chamber 50 is formed around the ejection port 330 of the ejector nozzle 30. By forming the negative pressure chamber 50, the abrasive is sucked from the abrasive introduction port 70 side. Then, the abrasive sucked into the negative pressure chamber 50 further rides on the jet stream of high-pressure air from the ejector nozzle 30, and the blast gun nozzle 20.
Will be jetted from to the work. By the spraying of the abrasive, the work is processed.

[0003]

By the way, in such a series of flow (jetting) of the abrasive, the abrasive introduced from the abrasive introduction port 70 forms a part of the blast gun body 10. The chamber wall 15 of the negative pressure chamber 50
The surface portion of 0 may be damaged. In particular, since the blast gun body 10 is made of a cast product made of an aluminum alloy or the like, there is a problem that the surface portion (chamber wall) 150 is easily ground by the flow motion of the abrasive. That is, the surface of the chamber wall 150 may be worn. The fine powder made of aluminum alloy produced by this abrasion mixes into the abrasive material, and these are sprayed toward the work. As a result, a substance having a kinetic energy larger than that of the original abrasive material collides with the surface of the work, causing a chipping phenomenon or the like on the work surface. In order to solve such a problem, it is an object of the present invention to provide a blast gun device having a structure in which the chamber wall portion of the negative pressure chamber is protected by a material having excellent wear resistance. It is an object (problem) of the present invention.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, in the invention according to claim 1, a blast gun main body which is made of an aluminum alloy casting and has an air introduction port for introducing high-pressure air and an abrasive introduction port for introducing an abrasive, A blast gun nozzle provided at the tip of the blast gun body,
A blast gun for ejecting high-pressure air introduced from the air introduction port side, the ejector nozzle having a tip portion provided near the confluence of the air introduction port and the abrasive introduction port. Regarding the device, the injection port provided at the tip of the ejector nozzle is formed of a material having excellent wear resistance around the negative pressure chamber formed on the back surface of the injection port and on the inner surface side of the blast gun body. It was decided to adopt a configuration in which a protective layer was provided.

[0005] By adopting such a configuration, the present invention has the following functions. That is, in this blast gun device, when high-pressure air is ejected from the ejector nozzle, a negative pressure portion is formed on the back surface of the ejector nozzle. That is, the negative pressure chamber is formed. Then, the abrasive is introduced into the negative pressure chamber through the abrasive introduction port. Further, this abrasive is jetted from the blast gun nozzle to the work while riding on the flow of high-pressure air jetted from the ejector nozzle. Due to the series of flow actions, the abrasive material comes into contact with the inner wall of the blast gun body at the chamber wall of the negative pressure chamber. Particularly, in the negative pressure chamber, the flow rate of the abrasive is considerably high, so that the abrasive comes into contact with the surface of the chamber wall violently.

However, in the present invention,
Since the protective layer made of a material having excellent wear resistance is provided at the chamber wall of the negative pressure chamber, the protective layer protects the aluminum alloy casting surface of the blast gun body. It will be. Therefore, the polishing agent does not grind the chamber wall portion, and the sprayed polishing agent does not include heavy metal fine powder. As a result, it is possible to prevent the occurrence of chipping or the like on the work surface of the workpiece, which has been a concern in the related art.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The feature thereof is that in the invention according to claim 1, the protective layer provided on the chamber wall of the negative pressure chamber has a high surface hardness such as boron steel,
Therefore, while forming with a metal liner excellent in wear resistance, the metal liner, during the molding of the aluminum alloy blast gun body, by the cast-molding means,
That is, it is provided integrally with the blast gun body. By adopting such a configuration, in the present invention, in addition to the above-mentioned first aspect, it is possible to easily form a negative pressure chamber chamber wall having excellent wear resistance. become. Therefore, the blast gun body having such a chamber wall can be manufactured at low cost, and thus the entire blast gun device can be manufactured at low cost. In addition, most of the blast gun body is made of aluminum alloy,
Since only the chamber wall is made of a special alloy having a relatively large mass, the weight of the blast gun main body and the entire blast gun device can be reduced.

Next, the invention according to claim 3 will be described. This is also basically the same as the first and second aspects. The feature is that in the invention according to claim 1, the protective layer provided at the chamber wall of the negative pressure chamber is formed by plasma spraying means of titanium (Ti) alloy. is there. By adopting such a configuration, the protective layer can be formed in a thin film shape, and the weight of the blast gun main body can be reduced. That is, since most of the blast gun main body can be formed of an aluminum alloy, the mass can be reduced. Moreover, in such a state, since a thin film made of titanium (Ti) alloy having excellent wear resistance is formed on the chamber wall portion of the negative pressure chamber, grinding (wear) by the abrasive material, etc. Is not affected by.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described. Although it relates to the embodiment of the present invention, its configuration is, as shown in FIG. 1, made of an aluminum alloy casting, and an air introduction port 6 into which high-pressure air is introduced.
And a blast gun body 1 having an abrasive introduction port 7 into which the abrasive 9 is introduced, and a blast gun nozzle that is provided at the tip of the blast gun body 1 and blows the abrasive 9 toward a workpiece. 4 and an ejector nozzle 3 which is attached to the air introduction port 6 side and ejects high-pressure air.

In such a basic structure, the blast gun body 1 has a so-called Y structure in which the air introduction port 6 and the abrasive introduction port 7 are combined in a Y shape as shown in FIG.
It has a character shape. The Y-shaped one is formed of an aluminum alloy casting or the like. Then, the air introduction port 6 and the abrasive introduction port 7 are united (merged).
An ejector nozzle 3 for injecting high-pressure air introduced from the side of the air introduction port 6 is provided in the place. And this ejector nozzle 3
An injection port 33 for injecting the high-pressure air is provided at the tip of the. Further, a blast gun nozzle 4 for ejecting the abrasive 9 and high-pressure air toward the work is provided at the tip of the injection port 33 and at the end of the blast gun body 1. Has become. In addition, this blast gun nozzle 4
Is formed of boron steel or the like, which has excellent wear resistance, because the abrasive 9 passes through the opening 44 of the inner diameter at a high speed. In addition, such a blast gun nozzle 4
For this purpose, a plurality of types having different values of the diameter of the inner diameter opening 44 are prepared, and depending on the grinding condition of the work,
It can be replaced as needed.

In such a construction, the ejector nozzle 3 has a rear surface portion of the ejection port 33 provided at its tip portion, that is, a rear surface portion when high-pressure air is ejected from the ejection port 33. Has a negative pressure chamber 5 formed therein. A protective layer 2 is provided on the chamber wall of the negative pressure chamber 5 where the inner surface of the blast gun body 1 is formed. The protective layer 2 is generally formed of a liner made of alloy steel having excellent wear resistance such as stainless steel and boron steel. Then, such a metal liner having excellent wear resistance (wear resistant liner) is integrally formed with the blast gun main body 1 by a cast-molding means or the like when molding the blast gun main body 1 by casting. It is designed to work. As a means for forming the protective layer 2, a thin film made of titanium (Ti) alloy is provided on the chamber wall forming the negative pressure chamber 5 of the blast gun body 1 by using plasma spraying means. The method of making it form is mentioned.
As a result, the protective layer 2 can be thinned. In addition to the reduction in the thickness of the protective layer 2 as described above, it is possible to reduce the weight of the blast gun body 1 and thus the weight of the entire blast gun apparatus.

Next, the operation and the like of the embodiment having the above-described configuration will be described. That is, in the present blast gun device, when high-pressure air is jetted from the jet port 33 provided at the tip of the ejector nozzle 3, a negative pressure portion is formed on the back surface of the ejector nozzle 3. Become. That is, the negative pressure chamber 5
Is formed. And, to this negative pressure chamber 5,
The abrasive 9 is introduced through the abrasive introduction port 7. Further, the abrasive material 9 is jetted from the blast gun nozzle 4 toward the work while riding on the flow of high-pressure air jetted from the jet port 33 of the ejector nozzle 3. Due to this series of flow actions, the abrasive 9 comes into violent contact with the surface of the chamber wall at the chamber wall of the negative pressure chamber 5, which is the inner surface side of the blast gun body 1. However, in the present embodiment, since the protective layer 2 made of a material having excellent wear resistance is provided at the chamber wall of the negative pressure chamber 5, the protective layer 2 prevents The blast gun body 1
The part of the aluminum alloy casting surface is protected. Therefore, the abrasion (grinding) of the chamber wall portion by the abrasive 9 is prevented. As a result, it is possible to prevent the metal fine powder having a heavy mass, which has been a concern in the prior art, from being mixed into the abrasive material 9, and the occurrence of chipping or the like on the work surface.

Further, the protective layer 2 provided on the chamber wall of the negative pressure chamber 5 is formed by a cast-molding means of a wear resistant liner or a plasma spraying means of a titanium (Ti) alloy. In this case, most of the blast gun body 1 can be formed of an aluminum alloy, and only the chamber wall portion can be formed of a special alloy having excellent wear resistance. It is possible to reduce the weight of the blast gun device as a whole.

[0014]

According to the present invention, there is provided a blast gun body which is made of an aluminum alloy casting and has an air introduction port for introducing high-pressure air and an abrasive introduction port for introducing an abrasive. A blast gun nozzle provided at the tip of the blast gun body, for injecting high pressure air introduced from the air introduction port side, in the vicinity of the confluence of the air introduction port and the abrasive introduction port, With respect to a blast gun device including an ejector nozzle provided with a tip portion, the injection port provided at the tip portion of the ejector nozzle is located around a negative pressure chamber formed on the back surface of the blast gun body. Since it is decided to provide a protective layer made of a material with excellent wear resistance on the inner surface side, The abrasive flows at a high speed in the negative pressure chamber with the injection of the compressed air. However, due to the high speed flow of the abrasive, the chamber wall of the negative pressure chamber is ground (abraded). It's gone. As a result, mixing of heavy metal fine powder into the abrasive is avoided, and chipping on the work surface is prevented.

Further, by forming the protective layer provided on the chamber wall of the negative pressure chamber with a metal liner or a thin film coating material, the weight of the blast gun main body is reduced, and by extension the blast gun. It has become possible to reduce the weight of the entire gun device.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the overall configuration of the present invention.

FIG. 2 is a longitudinal sectional view showing the entire configuration of a conventional example.

[Explanation of symbols]

 1 Blast Gun Main Body 2 Protective Layer (Abrasion Resistant Liner) 3 Ejector Nozzle 33 Injection Port 4 Blast Gun Nozzle 44 Inner Diameter Opening 5 Negative Pressure Chamber 6 Air Introducing Port 7 Abrasive Introducing Port 9 Abrasive

Claims (3)

[Claims] 1. A blast gun body made of an aluminum alloy casting, having an air introduction port for introducing high-pressure air and an abrasive introduction port for introducing an abrasive, and a tip portion of the blast gun body. For ejecting high pressure air introduced from the air introduction port side with a blast gun nozzle provided in the ejector, the tip of which is provided near the confluence of the air introduction port and the abrasive introduction port. In a blast gun device including a nozzle, a wear resistance is provided around the negative pressure chamber formed on the back surface of the injection port provided at the tip of the ejector nozzle and on the inner surface side of the blast gun body. A blast gun device characterized in that a protective layer made of a material having excellent properties is provided. 2. The blast gun device according to claim 1, wherein the protective layer is formed of a metal liner having excellent wear resistance, and the liner is cast at the time of molding the blast gun body. A blast gun device characterized in that it is integrally provided by molding means. 3. The blast gun device according to claim 1, wherein the protective layer is made of a thin film formed by plasma spraying means of titanium (Ti) alloy.