JP2005254348A - Jet material pressure-feed method, blast machining method using the jet material force-feed method, jet material force-feed device and blast machining apparatus having the jet material force-feed device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet material pressure-feed method which prevents cohesion and compaction even in the case of using jet material having small grain size in blast machining, and quantitatively stably supplies the jet material to a blast nozzle. <P>SOLUTION: In this jet material force-feed method, a fixed quantity of jet material is introduced from the jet material tank 2 to a cylindrical pressurizing tank 11 disposed between a jet material tank 2 and a blast nozzle of a blast machining apparatus 1, the introduction of stirring compressed gas is started at the deposit part of the jet material introduced into the pressurizing tank 11 to stir the jet material in the pressurizing tank 11, and the introduction of pressurizing compressed gas from the pressurizing tank side wall 11b is started to pressurize the interior of the pressurizing tank 11, thereby pressure-feeding the stirred jet material to the blast nozzle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an injection material pumping method and an injection material pumping device for pumping an injection material to a blast nozzle in a blast processing apparatus, and more specifically, quantitatively determining the injection material even in blast processing using an injection material made of fine powder particles. Injecting material pumping method and injecting material pumping device, blasting method using the injecting material pumping method, blasting apparatus provided with the injecting material pumping device, and blasting method Relates to a blasted product comprising

  Blasting is a process of cutting, polishing, polishing, deburring, film formation, decoration such as satin finish, and shot beaning, etc., by spraying the spray material at high speed onto the workpiece. However, in recent years, it has been widely applied to microfabrication such as the formation of partition walls on the back plate of PDP (plasma display), microreactor, vacuum chuck, electrostatic chuck pin formation, groove formation, and silicon wafer surface formation. It's being used.

  In the above fine processing, a small-diameter injection material such as a fine powder is used. However, in such a small-diameter injection material, injection is performed in comparison with an injection material having a large particle diameter. There is a tendency that adhesion between materials and cohesiveness increase and fluidity decreases. In general, it is said that the adhesion force and cohesiveness per unit volume of the granular material increase in inverse proportion to the square of the particle diameter, and the adhesion and aggregation of the granular material becomes stronger as the particle diameter decreases. Become.

  In particular, in a direct pressure type blast processing apparatus, since the injection material in the pressurization tank is pressurized and agitated by introducing compressed gas into the pressurization tank, the injection material is powdered. In the case of a granule, “consolidation” in which the aggregation of the injection material becomes stronger due to the pressurization tends to occur. When compaction occurs in this way, a part of the propellant remains deposited in the pressurized tank and the amount of propellant supplied changes, or even if the compacted propellant is crushed by impact or the like, it is a lump This remains as a “dama”, which becomes a factor such as staying in the flow path of the injection material, causing uneven injection, and closing the blast nozzle.

  Therefore, in the direct pressure type blast processing apparatus, although high injection energy can be obtained due to the presence of the pressurized tank, aggregation occurs with a particle size of # 240 (particle size of 57 μm) due to the pressurization, and # 1000 ( There is a problem that the powder particles smaller than 11.5 μm fall into a state in which injection is impossible.

  In order to solve such a problem, various injection material pressure feeding methods for suitably injecting even when using an injection material composed of fine powder particles have been studied. As an example of such an invention, An injection material supply apparatus as shown in FIG.

  In the injection material supply apparatus 210 shown in FIG. 6, the pressurized tank 245 into which the injection material is charged is provided with a feed pipe 246 that penetrates between the side walls of the pressure tank 245 above the deposition position of the injection material. In addition, an injection port 248 opening upward is provided at the bottom of the pressurized tank 245, and the propellant deposited in the pressurized tank 245 is stirred and floated by the compressed gas introduced from the injection port 248. The pressure tank 245 is pressurized to create a pressure difference between the pressure tank 245 and the feed pipe 246, and the spray material is fed into the feed pipe 246 together with the atmosphere in the pressure tank 245. It is configured to flow to the injection material supply port 243 and pump it to the blast nozzle.

  The pressurized tank 245 has at least a lower inner wall inclined in the inner circumferential direction toward the bottom so that the propellant can be moved to the jet port 248 even when the propellant in the interior is a granular material. In addition to falling on the inclined surface, the pressurized tank 245 is placed on a vibration generating means 260 that generates vibration by introducing compressed air, and the vibration generating means 260 is used to pressurize the pressurized material at the time of pressure feeding. The injection material adhering to the inner wall of the pressurized tank 245 is preferably dropped by vibrating the 245 in the vertical direction.

  In addition, there is a method of creating a new surface by using a jetting material to jet and collide with the surface of the workpiece by using the jetting energy of the blast.

  For example, solid lubricant molybdenum disulfide and graphite are sprayed to create a self-lubricating surface. In addition, metal tin and titanium are sprayed to create a new surface, which is an industrially useful technology.

In general, machine element parts that require friction resistance and wear resistance, such as sliding products, have a lubricating layer formed on the surface so that they can exhibit excellent friction resistance and wear resistance for a long period of time. Yes. As a method of forming such a lubricating layer, there is a method of applying a liquid lubricant such as lubricating oil or grease to the surface, but the lubricating effect is not exhibited under conditions such as vacuum, ultra-high temperature, low temperature, etc. Limited by usage environment. Therefore, solid lubricants such as graphite (graphite), molybdenum disulfide (MoS ₂ ), tungsten disulfide (WS ₂ ), polytetrafluoroethylene (PTFE), boron nitride, etc. A method of forming a lubricating layer using a polymer material is also generally used.

  As a method for forming a lubricating layer using the solid lubricant or the like, a method in which a solid lubricant is applied to a workpiece surface together with a binder and dried, and after the surface of the workpiece is roughened and the solid lubricant is disposed In general, a baking method, a method of diffusing a solid lubricant to the surface of a workpiece using a vacuum deposition technique such as an ion plating method, a sputtering method, and the like are common.

  Also, as a method of creating a lubricating layer by directly injecting and colliding solid lubricant raw material powder onto a member, a method of forming a molybdenum disulfide coating on a product to be treated by injecting molybdenum disulfide powder (non-patented) Document 1) is a method of forming a graphite film on a product to be treated by spraying graphite powder at high speed. All of these injection material pumping methods are siphon type (suction type), and are not direct pressure type blasting methods using a pressurized tank using high injection energy and efficient energy.

The following can be mentioned as prior art documents of the present invention.
JP 2003-25228 A Tribology Conference Proceedings Tokyo 2003-5 E19 Japanese Society of Tribology

  According to the propellant supply device 210 described in Patent Document 1, the propellant in the pressurized tank 245 can be suitably agitated and floated by the compressed gas from the injection port 248 at the bottom of the pressurized tank 245. Since the propellant circulates stably, even if a powder with a small particle size is used as the propellant, it is possible to prevent the adhering / aggregation of the propellant as described above. It is possible to perform fine processing. That is, powder particles having a particle size smaller than particle size # 300 to 400 (particle size 60 to 50 μm), for example, fine particles having a particle size of about # 3000 (4.0 μm) can be used as the propellant.

  However, even the injection material supply device 210 described in Patent Document 1 lacks injection stability for the injection material finer than the particle size # 3000 (particle size: 4.0 μm), Problems such as clogging due to aggregation occur.

  In this specification, since the particle size varies depending on the measurement method, the particle size is determined by the electrical resistance test method of JIS R6001 (1998) (particle size at 50% cumulative height (dv-50 value)). μm).

  This is because when the compressed gas is introduced from the injection port 248, the injection material deposited on the upper portion of the injection port 248 and its peripheral portion is preferably stirred, floated, and repeatedly circulated, but the outer periphery (near the inner wall) The propellant deposited in () is strongly agglomerated by the pressure increase in the pressurized tank before the compressed gas is blown up, and is consolidated in the pressurized tank as indicated by the dotted line in FIG. Because.

  In this way, the injection material is consolidated at the outer peripheral portion of the injection port 248 in the pressurized tank 245, so that the injection material is not used for injection, and the efficiency of the injection material cannot be utilized, and the supply amount of the injection material is reduced. There is a problem that it becomes unstable and affects the machining accuracy.

  Even if the compacted spray material is broken by the vibration of the vibration generating means 260, the dispersed state is different from the spray material stirred in the vicinity of the injection port 248 described above, and is “dull”. This “dama” stays in the flow path of the injection material or closes the blast nozzle, thereby obstructing stable injection of the injection material and making it impossible to inject.

  Further, in the fine processing described above, a small-diameter injection material, such as a fine powder, is used, but such a small-diameter injection material is compared with an injection material having a large particle size. As a result, the adhesion force and cohesiveness between the propellants tend to increase and the fluidity tends to decrease. In general, it is said that the adhesion force and cohesiveness per unit volume of the granular material increase in inverse proportion to the square of the particle diameter, and the adhesion and aggregation of the granular material becomes stronger as the particle diameter decreases. Become.

  Therefore, in order to solve the above-mentioned conventional problems, the present invention has a smaller particle size (for example, even when a powder particle having a smaller particle size than particle size # 3000 (particle size 4.0 μm) is used as the propellant, An injection material pumping device and an injection material pressure feeding device that can suitably prevent agglomeration and consolidation of the injection materials, and also prevent the formation of “dama” to stably supply the injection material. It aims to provide a method.

In order to achieve the above object, the injection material pumping method of the present invention comprises:
A fixed amount of the injection material is introduced from the injection material tank 2 into the cylindrical pressure tank 11 disposed between the injection material tank 2 and the blast nozzle of the blast processing apparatus 1 and introduced into the pressure tank 11. The introduction of the compressed compressed gas for stirring is started in the deposited portion of the injected material, the injected material is stirred in the pressurized tank 11, and the introduction of the compressed compressed gas from the pressurized tank side wall 11b is started. Then, the inside of the pressurizing tank 11 is pressurized, and the jetting material in the stirring state is pumped to the blast nozzle (Claim 1).

  The introduction of the compressed gas for pressurization into the pressurized tank 11 is preferably started after the introduction of the compressed gas for agitation (Claim 2). It is preferable that the pressure be lower than that of the gas (claim 3).

  In the injection material pumping method of the present invention, it is preferable that a swirl flow along the inner wall 11b ′ of the pressurized tank is generated in the pressurized tank 11 by the compressed compressed gas (Claim 4). The cylinder 17 having a diameter smaller than the inner diameter of the pressurized tank 11 is disposed in the pressurized tank 11, and the compressed compressed gas is introduced between the inner wall of the pressurized tank and the outer wall of the cylinder. A swirling flow can be generated (claim 5).

  In addition, vibration may be applied to the pressurized tank 11 (Claim 6), or the inside of the pressurized tank 11 may be heated (Claim 7).

  The blasting method of the present invention is characterized by injecting the injection material pumped by the injection material pumping method of the present invention onto a workpiece (Claim 8). In the blasting method, a spray material finer than particle size # 3000 (particle size 4.0μm) is sprayed to form a surface layer or film made of the spray material, specifically a new surface layer such as a lubricating layer. (Claim 9).

Moreover, the injection material pumping device 10 of the present invention that realizes the injection material pumping method of the present invention comprises:
Injection that is disposed between the spray material tank 2 and the blast nozzle of the blast processing apparatus 1 and is introduced into the cylindrical pressure tank 11 that introduces the spray material from the spray material tank 2 into the pressure tank. Introduction part of compressed gas for stirring that opens (22) in the material depositing part, and introduction of compressed gas for pressurization that opens (24) in the side of the pressurized tank above the opening position of the introduction part of compressed gas for stirring Tube,
Opening (25) in the pressurized tank and providing a feed pipe communicating with the blast nozzle;
A compressed gas supply means for supplying compressed gas to the introduction part 12 and the introduction pipe 14 is provided (claim 10).

  The compressed gas supply means includes a start delay means 51 that starts supplying compressed gas to the pressurizing compressed gas introduction pipe 14 after the supply of compressed gas to the stirring compressed gas introduction section 12. (Claim 11).

  The compressed gas supply means includes pressure adjusting means 54 for supplying a compressed gas having a pressure lower than that of the compressed gas supplied to the agitation compressed gas introduction section 12 to the pressurized compressed gas introduction pipe 14. (Claim 12).

  Preferably, the agitation compressed gas introduction part 12 includes a guide member that opens at a plurality of agitation ports 22 (Claim 13), and the guide member is provided at the bottom of the pressurized tank 11, for example. Examples thereof include a guide plate 21 having a plurality of stirring ports 22, a guide tube 28 that branches into a plurality of forks in the pressurized tank 11, and whose tips are open to form the stirring ports 22.

  Further, the inner wall 11b 'of the pressurized tank 11 is preferably provided so as to be inclined toward the outer peripheral direction toward the bottom of the pressurized tank 11 (claim 14).

  Further, in the injection material pumping device 10 of the present invention, the pressurized compressed gas introduced into the pressurized tank 11 via the introduction pipe 14 generates a swirling flow along the pressurized tank inner wall 11b ′. It is preferable to be configured.

  As an example, the pressurized compressed gas introduction pipe 14 is arranged in a direction in which the compressed compressed gas introduced through the introduction pipe generates a swirling flow along the inner wall of the pressurized tank. ), Providing a swirl derivative on the inner wall 11b ′ of the pressurization tank in a direction in which the compressed gas for pressurization introduced into the pressurization tank 11 generates a swirl flow along the pressurization tank inner wall 11b ′. (Claim 16). Examples of the swivel derivative include protrusions such as blades that promote the flow of compressed gas for pressurization, grooves, and the like.

  In addition to the direction of the pressurized compressed gas introduction pipe 14 and the swivel derivative, a cylindrical body 17 having a diameter smaller than the inner diameter of the pressurized tank is formed in the pressurized tank 11 with the inner wall 11b ′ of the pressurized tank. A compressed gas for pressurization introduced into the pressurized tank 11 is swung along the pressurized tank inner wall 11b ′ between the cylindrical outer wall 17 ′ and the pressurized tank inner wall 11b ′. A flow may be generated (claim 17).

  It is preferable that the cylindrical body 17 has a substantially inverted conical shape with a bottom portion downward (Claim 18). Further, similarly to the inner wall 11b 'of the pressurized tank, the outer wall 17' of the cylindrical body 17 may be provided with swirling derivatives such as blades and grooves in the direction in which the swirling flow is generated.

  In the case where the swirling flow of the pressurized compressed gas as described above is generated in the pressurizing tank 11, it is preferable that the feeding pipe 15 is disposed on the swirl direction extension of the swirling flow. .

  Furthermore, it is preferable that the injection material pumping device 10 of the present invention includes a vibration generating unit 18 that applies vibration to the pressurizing tank 11 and a heating unit that heats the inside of the pressurizing tank 11 (Claims 21 and 22). ).

  Further, the blasting apparatus 1 of the present invention is provided with the above-described injection material pumping apparatus 10 of the present invention (claim 23).

  Since the propellant pumping method and the propellant pump 10 of the present invention are configured to separately introduce the compressed gas for stirring and the compressed gas for pressurization into the pressurized tank 11, they were introduced at the depositing portion of the propellant. While stirring the injection material with the compressed gas for stirring, the inside of the pressure tank 11 is pressurized while maintaining the stirring state of the injection material with the compressed gas for pressurization introduced from the side wall 11b of the pressure tank 11. Can do.

  In addition, the inside of the pressurized tank 11 is at a high pressure due to the compressed gas for stirring and the compressed gas for pressurization, and a pressure difference is generated between the feeding pipe 15 provided above the pressurized tank 11, As described above, the propellant which is stirred and suitably dispersed in the pressurized tank 11 is pumped to the feeding pipe 15 while maintaining the dispersed state together with these compressed gases (atmosphere in the pressurized tank 11). The

  Therefore, the agglomeration of the injection material can be suitably prevented, the occurrence of “dama” due to the agglomeration can be prevented, and the feeding to the blast nozzle in the pressurized tank 11 of the injection material pressure feeding device 10 can be achieved. The injection material can be prevented from accumulating in the pipe 15 and other injection material flow paths, and a constant amount can be stably injected without causing uneven injection or blockage of the blast nozzle. Moreover, since the accumulation and retention of the propellant can be suitably prevented, the propellant can be used effectively.

  In addition, at the time of start-up, the introduction timing of the compressed gas for stirring and the compressed gas for pressurization into the pressurized tank 11 is shifted, and after the compressed gas for stirring is introduced, the compressed gas for pressurization is introduced later than this. By starting, it is possible to pressurize the pressure tank 11 while suitably maintaining the stirring state in a state where the stirring of the spray material in the pressure tank 11 is completed in advance. The dispersion can be further improved.

  Further, by providing a pressure difference between the compressed gas for stirring and the compressed gas for pressurization and setting the compressed gas for pressurization to a pressure lower than that of the compressed gas for stirring, the stirring action of the injection material by the compressed gas for stirring is performed. It can be prevented from being obstructed by the compressed gas for pressurization, and the pressure tank 11 can be pressurized while suitably stirring and dispersing the spray material.

  In the injection material pumping device 10 for realizing the injection material pumping method, the stirring compressed gas introducing portion 12 for introducing the stirring compressed gas into the pressurizing tank 11 is provided as a guide plate 21, a guide tube 28, or the like. If the structure is provided with a guide member that opens at a plurality of stirring ports 22, the jetting material accumulated in the pressurized tank 11 can be blown up and stirred thoroughly by the compressed gas for stirring introduced from the stirring ports 22. Further, it is possible to suitably prevent the consolidation due to the deposition of the injection material.

  In addition, the inner wall 11b ′ of the pressurizing tank 11 is inclined so as to bulge in the outer peripheral direction toward the bottom of the pressurizing tank 11, such as a so-called divergent shape. When a material adheres to the inner wall of the pressurized tank 11, it can be dropped, and the spray material can be suitably prevented from adhering.

  Further, by causing the compressed gas for pressurization to generate a swirl flow along the inner wall 11b of the pressurization tank in the pressurization tank 11, the spray material in the pressurization tank 11 swirls on the swirl flow. Therefore, it is possible to make the spray material in a more favorable dispersed state.

  In the injection material pumping device 1, the arrangement direction of the pressurized compressed gas introduction pipe 14 for introducing the compressed compressed gas into the pressurized tank 11 is adjusted, or the cylinder 17 is placed in the pressurized tank. Since the flow of the compressed gas for pressurization is induced by arranging and providing a swirling derivative on the inner wall 11b ′ of the pressurized tank and the outer wall 17 ′ of the cylinder, the aforementioned swirling flow is preferably generated. Can do.

  Further, at this time, if the feed pipe 15 is arranged on the extension of the swirling flow in the swirling direction, an injection material swirling in the pressurized tank 11 by the compressed gas for stirring and the compressed gas for pressurization is preferable. It can be smoothly pumped to the feed pipe 15 while maintaining the dispersed state.

  Further, by applying vibration to the pressurized tank 11 or heating the inside of the pressurized tank, the agglomeration of the spray material, adhesion / deposition in the pressurized tank 11 and the like are suitably prevented. And the propellant can be in a good dispersed state.

  According to the injection material pumping method and the injection material pumping device 10 as described above, since the injection material can be dispersed in a desired state and the aggregation of the injection material can be suitably prevented, the injection material pumped by the injection material pumping method can be used. In the blasting method for spraying and the blasting device provided with the above-mentioned spraying material feeding device, the particle size is smaller than the particle size # 3000 (particle size: 4.0 μm) which is the limit in the invention described in Patent Document 1 above. The body can be used as a propellant, and the propellant can be quantitatively and stably pumped to the blast nozzle.

  Therefore, in the blasting method and blasting apparatus, particle size # 150 (particle size 69 μm) to particle size # 30000 (particle size 0.1 μm), preferably particle size # 240 (particle size 57 μm) to particle size # 15000 (particle size 0.3 μm) ) A granular material having a particle size of the order can be used as a propellant.

  In addition, the material of the injection material used in the present invention is not particularly limited, and can be widely used, such as metal, resin, ceramics, and the shape thereof can be various shapes such as not only a spherical shape but also a corner portion. .

  By using a powder particle having such a small particle size as the spray material, various fine processing can be suitably performed, and the blasted product that is blasted by spraying this spray material has high processing accuracy. It will have good finished quality.

  Hereinafter, as an embodiment of the present invention, an injection material pumping device that realizes an injection material pumping method, and a blast processing apparatus including the injection material pumping device will be described with reference to the drawings.

1. The injection material pressure feeding device The injection material pressure feeding device 10 is disposed between the injection material tank 2 and the blast nozzle of the blast processing device 1, and agitates the spray material circulating in the blast processing device 1 to disperse it in a desired state. The injection material is pumped to the blast nozzle.

  In the embodiment shown in FIG. 1 to FIG. 3, the injection material pumping device 10 of the present invention includes a cylinder 17 that is suspended in the pressurization tank 11 in addition to the pressurization tank 11 that houses the injection material. The vibration generating means 18 is provided on the outer wall of the pressurized tank 11. Further, the injection material pumping device 10 includes a compressed gas supply means for supplying a compressed gas to a stirring compressed gas introducing portion 12 and a pressurized compressed gas introducing pipe 14 of a pressurized tank 11 to be described later. . Further, in the pressurizing tank 11, the spray material tank 2 of the blast processing apparatus is disposed above via the dump valve 6, and the vibration applied by the vibration generating means 18 affects other apparatuses. The pressurized tank 11 is suspended in the casing 3 via a spring 5 so as not to be present.

Pressurized tank The pressurized tank 11 functions as a pressure vessel whose inside is pressurized by introduction of compressed gas. In the present embodiment, the pressurized tank 11 has a substantially cylindrical shape. Is provided with a stirring compressed gas introducing portion 12 (hereinafter referred to as “stirring portion”), and the pressurized tank side wall 11b above the stirring compressed gas introducing portion 12 includes: A pressurized compressed gas introduction tube 14 (hereinafter referred to as a “pressurized tube”) is provided.

  Further, a feed pipe 15 communicating with the blast nozzle of the blasting apparatus 1 is provided on the pressurization tank side wall 11b above the pressurization pipe 14, and an injection material is further introduced into the pressurization tank 11. A discharge pipe 16 for discharging the atmosphere (compressed gas) in the pressurized tank 11 is provided in order to release the pressurized state in the pressurized tank 11 when being charged.

  The pressurizing tank 11 is not limited to a cylindrical shape as long as the propellant accommodated therein can be suitably agitated and the inside can be pressurized to feed the propellant to the blast nozzle. 11c and upper surface 11a may be a cylindrical body having a polygonal shape, and the shape is not particularly limited.

  Further, the inner wall of the pressurized tank 11 may be vertical, but it is preferable that the inner wall of the pressurizing tank 11 has a divergent shape that slightly inclines toward the outer periphery as it goes toward the bottom surface. Thereby, even when the spray material floating in the pressurized tank 11 adheres to the inner wall of the pressurized tank 11, it can be dropped. The inclination angle can be appropriately adjusted within a range in which adhesion of the spray material can be suitably prevented, and is set to 0 ° to 30 ° as an example.

  In the present invention, the stirrer 12 for introducing the compressed gas for stirring into the pressurized tank 11 and the pressurizing pipe 14 for introducing the compressed gas for pressurization are separately provided. The injection material accumulated in the pressurized tank 11 is agitated by the introduced compressed gas for agitation, and is further maintained while the agitation state of the injection material is maintained by the compressed gas for pressure introduced from the pressure tube 14. The inside of the pressurized tank 11 can be pressurized while being dispersed into a desired state. Therefore, as in the invention described in Patent Document 1 in which only the compressed gas for stirring is introduced from the lower side of the pressurized tank 11, the injected material is not deposited and consolidated in the pressurized tank 11, and a certain amount of the injected material is supplied. It can be stably supplied to the blast nozzle.

  Note that the compressed gas for stirring and the compressed gas for pressurization do not act strictly differently, and both pressurize the pressurized tank 11 and stir and float the injection material in the pressurized tank 11. And has an action of dispersing in a desired state. In the present application, the gas introduced for the purpose of stirring and floating the propellant deposited in the pressurized tank 11 is a compressed gas for stirring, and the gas introduced for the purpose of further dispersing the propellant in the floating state is compressed for pressurization. Called gas.

  In addition, as the compressed gas such as the compressed gas for stirring and the compressed gas for pressurization used in the present invention, any gas may be used as long as it does not affect the blasting such as alteration of the injection material. In the embodiment, compressed air is used.

Stirrer The stirrer 12 opens at the stirring port 22 in the sprayed material depositing part so as to stir the sprayed material deposited in the pressurized tank 11 in the pressurized tank 11. Here, the depositing portion of the propellant refers to a portion of the pressurized tank 11 that comes into contact with the propellant deposited in the pressurized tank 11 and also includes the inside of the depositing propellant.

  The number of the stirring ports 22 may be one, but it is preferable to provide a plurality of the stirring ports 22 for the purpose of blowing up and stirring the spray material throughout.

  Further, the stirring port 22 is provided directly in the vicinity of the bottom surface 11c of the pressurized tank and the bottom surface 11c of the pressurized tank side wall 11b, and the compressed gas is supplied from the compressed gas supply means to the stirring port 22 and stirred into the pressurized tank. The stirring unit 12 may be configured to introduce the compressed gas for use. However, as in the following embodiment, guide members such as the guide plate 21 and the guide tube 28 having the stirring port 22 are provided in the pressurized tank 11. The stirring unit 12 can also be formed by preparing for.

  In the embodiment shown in FIG. 2, a guide plate 21, which is a plate-like body having a large number of stirring ports 22, is used as a guide member, and the guide plate 21 is spaced from the bottom surface 11 c of the pressurized tank 11 by a predetermined distance. A chamber 23 is formed between the guide plate 21 and the bottom surface by being provided substantially parallel to each other, and compressed gas is supplied to the chamber 23 from a supply pipe 13 communicating with the pressurized tank bottom surface 11c. Therefore, the compressed compressed gas for stirring is supplied into the pressurized tank 11 through the stirring port 22 of the guide plate 21 disposed above the chamber 23.

  If the guide plate 21 disposed above the pressurized tank bottom surface 11c can suitably introduce the compressed gas for stirring above the pressurized tank 11, the material and thickness thereof, the number of stirring ports 22, The shape, size, the drilling position of the stirring port 22, the drilling direction (angle), and the like can be changed as appropriate. Further, the stirring port 22 is not artificially drilled as in the present embodiment, but a porous material such as ceramics may be used.

  As an example of drilling the stirring port 22, a hole having a predetermined radius is formed on a circle having a predetermined radius from the center of the guide plate 21, or a radius with reference to the center is used. Drilling on different concentric circles with a predetermined interval, drilling with a predetermined interval on a straight line extending radially from the center, or a curve curved in a predetermined direction from the center, etc. . In addition to this, it is possible to puncture on a plurality of substantially straight lines through a predetermined interval, or to puncture the entire guide plate 21 at random without providing a puncture reference.

  In addition, in the present embodiment, the agitating port 22 is pierced substantially vertically as shown in FIG. 1, but the agitating compressed gas is introduced into the pressurized tank 11. As long as the spray material can be blown up and properly stirred by this, there is no particular limitation. From below the guide plate 21 facing the chamber 23 to above the guide plate 21 facing the inside of the pressurized tank 11. And may be drilled in a state inclined at a predetermined angle. For example, if all the agitation ports 22 are drilled at a predetermined angle in the same rotational direction, the generation of swirling flow in the pressurized tank 11 as described later can be promoted.

  In the present embodiment, a space is provided between the pressurized tank bottom surface 11 c and the guide plate 21 to form a chamber 23, and the chamber 23 is connected to the pressurized tank bottom surface 11 c from the supply pipe 13. The compressed gas is supplied to the stirring port 22 of the guide plate 21 through the supply pipe 13 as long as a compressed gas supply path from the supply pipe 13 to the stirring port 22 of the guide plate 21 is formed. Alternatively, a groove may be provided in the bottom surface 11c, and compressed gas may be supplied from the supply pipe 13 through the groove to the stirring port 22 of the guide plate 21 overlapped with the bottom surface 11c.

  Furthermore, in this embodiment, the guide plate 21 made of a plate-like body is used as the guide member. However, the stirring port 22 is formed, and the compressed gas for stirring is pressurized from the stirring port 22. As long as it can be introduced into the tank 11, not only a plate-like body but also a film-like body, a net-like body or the like can be used as a guide member.

  The guide member used in the embodiment of FIG. 2 is the guide plate 21 that stirs the spray material accumulated in the pressurized tank 11 from the outside. You may use the guide pipe | tube 28 etc. which introduce | transduce the compressed gas for stirring from the inside as said guide member.

  In the embodiment shown in FIG. 5, the supply pipe communicating with the bottom surface 11c of the pressurized tank is passed through the bottom surface as it is, and is branched into a plurality of branches in a predetermined direction, and the tip is opened to form the stirring port 22. The compressed gas for stirring is introduced into the pressurized tank 11 from the guide tube 28.

  The guide pipe 28 branches in the vertical direction and the horizontal direction in FIG. 5, but the number of branches of the guide pipe 24 and the direction of branching can be improved if the injection material in the pressurized tank 11 can be suitably stirred. Etc. are not specifically limited, For example, you may make it branch to diagonally upward.

  In the present embodiment, the guide tube 28 penetrates the pressurized tank bottom surface 11c in the vertical direction, but otherwise penetrates the vicinity of the bottom surface 11c of the pressurized tank side surface 11b. It is also possible to use, as the guide tube 28, a tube extending along the bottom surface 11c and having a plurality of stirring ports 22 formed on the side surface.

  Further, a plurality of the formation patterns of the agitation ports 22 as described above may be used in combination, and as long as it has a configuration capable of blowing up the injection material in the pressurized tank 11, the present invention can be used. The structure of the stirring part 12 in the injection material pumping apparatus 10 is not limited to the above.

Pressurizing tube The pressurizing tube 14 for introducing the pressurized compressed gas for pressurizing the inside of the pressurized tank 11 while maintaining the stirring state of the injection material stirred in the pressurized tank 11 by the compressed gas for stirring is the pressure tube 14. The pressure tank 11 opens at the side wall of the pressurized tank 11 above the stirring port 22 of the stirring unit 12 provided in the spray material depositing portion at the bottom of the pressure tank 11. In the present embodiment, as shown in FIG. 1, one pressurizing pipe 14 that opens at the pressurizing port 24 is provided at the approximate center of the total height of the pressurizing tank 11.

  The number, installation angle, and the like of the pressure tubes 14 are not particularly limited as long as the above-described effects can be exhibited, and can be changed as appropriate. The compressed compressed gas for stirring introduced from the stirring unit 12 below the pressure tank 11 In combination with the above, from the viewpoint of pressure-feeding the injection material to the supply pipe arranged above the pressurization pipe 14, the pressurization pipe 14 is also arranged in a direction to supply the compressed gas for pressurization in the horizontal direction or above. Is preferred.

  Further, the pressurizing pipe 14 may be installed so that its axis is perpendicular to the side wall of the pressurizing tank 11, but from the viewpoint of promoting the generation of a swirling flow in the pressurizing tank 11, for example, as shown in FIG. As described above, the axis of the pressurizing pipe 14 is arranged so as to be inclined at a predetermined angle with respect to the side wall of the pressurizing tank 11 at the position where the pressurizing pipe 14 is installed. In the case where the pressurizing tube 14 is suspended, the pressurizing compressed gas from the pressurizing tube 14 is added to the pressurizing tube 14 such that the axis of the pressurizing tube 14 is positioned on the tangential (direction) extension of the cylindrical body 17. The pressurizing pipe 14 is preferably installed so as to be introduced along the inner wall of the pressure tank 11.

  By installing the pressurizing pipe 14 in this manner, a swirling flow is generated in the pressurizing tank 11 by the compressed gas for pressurization introduced from the pressurizing pipe 14, and the injection material in the pressurizing tank 11 is this Since the swirl is performed while swirling, the spray material can be further dispersed in a desired state, and the spray material can be easily pumped to the feed pipe 15 provided in the pressurized tank 11.

Feeding tube The feeding tube 15 blasts the compressed gas for stirring introduced into the pressurized tank 11 and the propellant that has been stirred and dispersed in a desired state with the compressed gas for pressing together with the atmosphere in the pressurized tank 11. The pressure is fed to a blast nozzle (not shown) of the processing apparatus 1.

  In the present embodiment, as shown in FIGS. 1 to 3, the side wall 11 b near the upper surface 11 a of the pressurizing tank above the pressurizing pipe 14 is opened at the feeding port 25, and Although it arrange | positions in the symmetrical position with the pressure pipe 14, it makes it easy to pump the agitated injection material blown up to the pressurized tank 11 by the compressed gas for agitation, but the agitation material is pumped by the compressed gas for pressure. As long as the position is possible, the opening position such as the pressurized tank side wall 11b or the pressurized tank upper surface 11a is not particularly limited. For example, the arrangement positions of the pressurized pipe 14 and the feeding pipe 15 may be upside down. .

  The installation direction, installation angle, and the like of the feed pipe 15 can be changed as appropriate. However, from the viewpoint of smoothly feeding the injection material in the pressurization tank 11, the same as the pressurization pipe 14 is used. For example, the feed pipe 15 is arranged so that the axis of the feed pipe 15 is inclined at a predetermined angle with respect to the side wall of the pressurization tank 11 at the position where the feed pipe 15 is installed. 11, the feed pipe 15 is disposed so that the axis of the feed pipe 15 is located on the tangential (direction) extension of the cylindrical body 17, so that the feed pipe 15 is placed in the pressurized tank 11. It is preferable to install on the extension of the swirling direction of the swirling flow generated inside.

Compressed gas supply means The compressed gas supply means supplies compressed gas for agitation and compressed gas for pressure to the agitator 12 and the pressure tube 14 of the pressurized tank 11, respectively, and is a compressed gas supply source (not shown). In addition, a supply circuit 40 that communicates from the compressed gas supply source to the supply pipe 13 and the pressurization pipe 14 of the stirring unit 12 that is the supply destination is provided.

  The compressed gas supply means can introduce the compressed gas for stirring and the compressed gas for pressurization simultaneously. However, when the injection material pumping device 10 is started, the compressed gas for stirring is first supplied from the stirring unit 12. It is preferable that the injection material in the pressurized tank 11 is blown up and stirred, and then the pressurized tank 11 is pressurized by introducing a pressurized compressed gas through the pressurized pipe 14.

  Thus, by starting the introduction of the compressed compressed gas after the introduction of the compressed compressed gas, the blowing of the spray material by the compressed compressed gas is not hindered by the compressed compressed gas, and the pressurized tank In the state where the stirring of the propellant within 11 is completed in advance, the inside of the pressure tank can be pressurized while maintaining the stirring state, and the propellant can be suitably stirred and dispersed.

  The introduction time difference between the compressed gas for stirring and the compressed gas for pressurization can be appropriately changed depending on the size of the pressurizing tank 11 to be used, the amount of the spray material, the processing conditions, etc., but it should be within 3 seconds as an example. it can.

  Further, as described above, in order to pressurize the inside of the pressurized tank while maintaining the stirring state of the injection material by the compressed gas for stirring, a pressure difference is generated between the compressed gas for stirring and the compressed gas for pressurization. The compressed gas for pressurization is set to a low pressure with respect to the compressed gas for stirring. As an example, the pressure difference between the compressed gas for pressurization and the compressed gas for stirring is preferably 0.004 to 0.03 MPa, and preferably 0.004 to 0.01 MPa. Thereby, since the blowing pressure of the propellant by the compressed gas for stirring becomes higher than the swirling pressure by the compressed gas for pressurization, the propellant is suitably blown upward and agitated. The propellant can be suitably stirred and dispersed.

  Therefore, in the present invention, in the supply circuit 40 of the compressed gas supply means, the start delay means for introducing the pressurized compressed gas behind the introduction of the compressed gas for stirring, and / or the It is preferable to have a pressure adjusting means for introducing a pressurized compressed gas having a pressure lower than that of the compressed compressed gas.

  The start delay means and the pressure adjustment means are not particularly limited in configuration and installation position as long as the above-described time difference and pressure difference can be provided. For example, the start delay means includes a compressed gas supply source. An electromagnetic valve 51 for controlling the supply of compressed gas from the opening and closing can be used, and a ball valve 54 or the like can be used as the pressure adjusting means.

Supply Circuit FIG. 4 shows an example of the supply circuit 40. In addition to supplying the compressed gas from the common compressed gas supply source to the agitating unit 12 and the pressurizing tube 14, the blast processing apparatus is supplied from the compressed gas supply source. The compressed gas is also supplied to one blast nozzle, and the compressed gas supply source is branched into three forks into the stirring unit 12, the pressure tube 14, and the blast nozzle.

  Here, among the supply circuit 40, a circuit from the compressed gas supply source to the branch point 46 is connected to the common circuit 41, and a circuit from the branch point 46 to the supply pipe 13 of the stirring unit 12 is connected to the stirring circuit 42, A circuit from the branch point 46 to the pressurizing pipe 14 is referred to as a pressurizing circuit 44, and a circuit from the branch point 46 to the pipe to the blast nozzle is referred to as an injection circuit 48.

  In the embodiment shown in FIG. 4, the common circuit 41 is provided with an air filter 53 and a pressure reducing valve 55 for removing dust in the compressed gas supplied from a compressed gas supply source. After passing through the compressed gas supplied from the source, it is branched into three.

  The agitating circuit 42, which is one of the branched circuits, includes an electromagnetic valve 51 as an on-off valve that controls the supply of compressed gas, a check valve 52 that prevents backflow of gas, and an air filter 53. The compressed gas that has passed through is supplied to a supply pipe 13 that communicates with the stirring unit 12 of the pressurized tank 11.

  Further, the pressurizing circuit 44 is provided with an electromagnetic valve 51, a check valve 52, and an air filter 53, as well as the stirring circuit 42, and further, between the branch point 46 and the electromagnetic valve 51. A ball valve 54 for pressure adjustment is provided.

  The injection circuit 48 includes a pinch valve 56 that controls the supply of compressed gas to the blast nozzle.

  The operation of the compressed gas supply means including the supply circuit 40 as described above will be described below. When compressed gas is supplied from the compressed gas supply source through the common circuit 41, the compressed gas that has branched into three branches from the branch point and reached the stirring unit 12 of the pressurized tank 11 through the stirring circuit 42 is supplied to the stirring unit 12 From the stirring port 22, the compressed gas for stirring is supplied into the pressurized tank 11, and the propellant deposited in the pressurized tank 11 is blown upward and stirred.

  On the other hand, the compressed gas supplied to the pressurizing pipe 14 through the pressurizing circuit 44 is introduced into the pressurizing tank 11 from the pressurizing pipe 14 as a pressurizing compressed gas, but the injection material feeding device 10 is started. At the time (when the supply of compressed gas from the compressed gas supply source is started), the solenoid valve 51 provided in the pressurizing circuit 44 is closed, and the solenoid valve 51 is opened after a predetermined time has elapsed, thereby The supply of the compressed gas to 14 can be delayed, and the introduction of the compressed gas for pressurization can be started behind the introduction of the compressed gas for stirring into the pressurized tank 11.

  Further, the pressure of the compressed gas supplied to the pressurizing tube 14 is adjusted by the ball valve 54 provided in the pressurizing circuit 44, and the compressed compressed gas supplied to the pressurizing tube 14 is lower in pressure than the compressed gas for stirring. It can be.

  By providing the electromagnetic valve 51 and the ball valve 54, the supply timing and pressure of the compressed gas flowing through the pressurizing circuit can be controlled, and the pressurized tank is suitably maintained while maintaining the stirring state by the compressed gas for stirring. 11 can be pressurized.

  In addition, since both the agitating circuit 42 and the pressurizing circuit 44 have check valves, even when the pressure in the pressurizing tank becomes high due to the introduction of the compressed gas for stirring and the compressed gas for pressurization. , Gas backflow can be suitably prevented.

  Further, the compressed gas is supplied from the compressed gas supply source to the injection circuit 48, and the compressed gas is supplied to a pipe leading to a blast nozzle that communicates with the injection circuit 48. The injection material pressure-fed from the pressurization tank 11 to the feed pipe 15 by the compressed gas for agitation and the compressed gas for pressure is pressure-fed to the blast nozzle as it is, but by the compressed gas supplied through the injection circuit 48 Further, the pressure is further increased immediately before being ejected from the blast nozzle, and the material is ejected onto the workpiece with a high ejection pressure. Whether or not the compressed gas is supplied to the blast nozzle, the supply amount, and the like can be adjusted by a pinch valve 56 provided in the injection circuit 48.

  In addition, although the compressed gas supply circuit 40 shown in FIG. 3 demonstrated the case where the compressed gas supply source common to the said stirring part 12, the pressurization pipe | tube 14, and a blast nozzle was used, embodiment of this invention is limited to this. Instead, the compressed gas supply means may include a separate compressed gas supply source for each of the agitating unit 12, the pressurizing tube 14, and the blast nozzle, and in this case, each compressed gas supply is provided. By controlling the supply timing and supply pressure of the compressed gas from the source, it is possible to realize the introduction time difference and pressure difference between the compressed gas for stirring and the compressed gas for pressurization.

  Further, when a vibration generating means 18 (described later) installed in the pressurizing tank 11 of the injection material pumping apparatus 10 generates vibration by supplying compressed gas, the same applies to the vibration generating means 18. The compressed gas supply circuit 40 can be configured by supplying compressed gas from a compressed gas supply source or by providing a separate compressed gas supply source.

Cylindrical body The compressed compressed gas for stirring and the compressed compressed gas supplied into the pressurized tank 11 can make the propellant in a suitable dispersion state only by these, but it is more preferable to disperse the propellant. In the present embodiment, a cylinder that is smaller than the inner diameter of the pressurized tank 11 is provided in the present embodiment so that the injection material can be easily pumped from the feeding pipe 15. 17.

  The cylindrical body 17 is installed for the purpose of forming a flow path of compressed gas and an injection material between the inner wall 11b ′ of the pressurized tank 11 and the outer wall 17 ′ of the cylindrical body 17, thereby It is possible to promote the generation of a desired swirling flow in the pressurized tank 11.

  The cylindrical body 17 may have any size, shape, installation method or the like as long as it can achieve the above-described purpose. In the embodiment shown in FIG. In order to form the cylinder 11 uniformly, a cylindrical cylinder 17 is arranged coaxially with the central axis of the pressurized tank 11. Further, since the compressed gas for stirring 12 is provided with a guide plate 21 disposed above the bottom surface of the pressurized tank 11, the compressed gas for stirring from the guide plate 21 by the installation of the cylindrical body 17. The cylindrical body 17 is suspended from the upper surface of the pressurized tank 11 so that the introduction of is not hindered.

  In addition, from the viewpoint of making the stirring in the pressurized tank 11 uniform, it is preferable that the bottom of the cylindrical body 17 has a shape that forms an inverted conical shape toward the lower side. The compressed compressed gas for stirring introduced from the lower side of the pressurized tank 11 does not become a resistance when blown upward, and the compressed compressed gas for stirring is interposed between the pressurized tank inner wall 11b ′ and the cylindrical outer wall 17 ′. It becomes easy to be guided to the formed flow path.

  In addition, by forming the upper portion of the cylindrical body 17 into a conical shape, the sprayed material is prevented from adhering to the upper side of the cylindrical body when the sprayed material adhering to the pressure tank upper surface 11a falls. The material can be suitably stirred.

Vibration generating means The jetting material stirred and floated by the compressed gas for stirring and the compressed gas for pressurization in the pressurized tank 11 is prevented from adhering to and accumulating in the pressurized tank 11 and the cylinder, and the jet In the present embodiment, the vibration generating means 18 is provided on the outer wall of the pressurized tank 11 in order to make the dispersed state of the material good and to facilitate the pressure feeding of the spray material to the feeding pipe 15.

  As long as the vibration generating means 18 can give a desired vibration to the entire pressurized tank 11, regardless of the type, arrangement position, arrangement method, etc., the vibration motor or impact type vibration generating means 18, Various known vibration generating means 18 such as a vibration generating means 18 using compressed gas as described in the above-mentioned Patent Document 1 can be used. It may be arranged below or above the tank 11.

Other addition means Further, the agitation introduced into the pressurization tank 11 in order to suitably disperse the spray material in the pressurization tank 11 or to quickly pump the spray material to the feeding pipe 15. It is good also as providing swirl derivatives, such as a blade | wing and a groove | channel which induces the flow of the compressed gas for pressurization, and the compressed gas for pressurization, on the inner wall 11b ′ of the pressurization tank.
The flow of the compressed gas for pressurization introduced from the pressurized tank side wall 11b by such blades and grooves can be induced to generate a desired swirling flow in the pressurized tank 11. The swirling derivatives such as the blades and the grooves may be provided on the outer wall 17 ′ of the cylindrical body 17, or may be provided on both the pressurized tank inner wall 11b ′ and the cylindrical outer wall 17 ′.

  In addition, in order to prevent the spray material in the pressurized tank 11 from agglomerating due to humidity, a heating means may be installed in the pressure tank 11 to remove moisture from the spray material. The configuration, installation position, etc. of the heating means are not particularly limited as long as aggregation of the spray material in the pressurized tank can be suitably prevented.

2. Blasting apparatus The blasting apparatus 1 of the present invention is characterized by including the above-mentioned injection material pumping apparatus 10 of the present invention, and the other configurations can adopt the same configuration as a known blasting apparatus.

  As an example, the blasting apparatus 1 of the present invention communicates with the injection material pumping apparatus 10 of the present invention and the feed pipe 15 of the spray material pumping apparatus 10 and injects the spray material together with the compressed gas onto the workpiece. A blast nozzle, a processing chamber 23 for housing the blast nozzle, and a blast nozzle that communicates with the processing chamber 23 and collects and classifies the spray material sprayed from the blast nozzle and dust generated by the spray of the spray material. , An injection material tank 2 for feeding the classified injection material to the injection material pumping device 10, and a dust collector that communicates with the injection material tank 2 and collects the classified dust in the recovery tank Can be configured.

  In FIG. 1 and FIG. 2, an injection material tank 2 for storing the injection material is installed above the injection material pumping device 10, and the injection material tank 2 and the pressurization tank 11 of the injection material pumping device 10 are the same. The injection valve 6 is disposed via a dump valve 6 so that a predetermined amount of the injection material can be introduced into the pressurized tank 11 from the injection material tank 2.

  When the propellant in the pressurized tank 11 runs out and the propellant is introduced from the propellant tank 2 to the pressurized tank 11, the atmosphere in the pressurized tank 11 is provided on the side wall of the pressurized tank 11. The dump pipe 6 is opened after the pressure in the pressurizing tank 11 is reduced by discharging from the discharge pipe 16, and the injection material is dropped from the injection material tank 2.

  The feed pipe 15 communicates with a blast nozzle (not shown) for injecting the injection material onto the workpiece, and the injection material suitably dispersed by the injection material pumping device 10 is Along with the high-pressure atmosphere in the pressure tank 11, it is pumped to the blast nozzle through the feed pipe 15, and a predetermined amount of spray material is stably sprayed from the blast nozzle onto the workpiece. In addition, the injection from the blast nozzle can be performed by the compressed gas for stirring and the compressed gas for compression introduced into the pressurized tank 11. It is preferable to further supply compressed gas in the vicinity of the blast nozzle to increase the momentum of injection of the injection material from the blast nozzle. In the embodiment shown in FIG. 4, this is realized by the injection circuit 48.

3. Processing Example A blasted product obtained by injecting a fine injection material using the injection material pumping apparatus (method) of the present invention will be described.

Creation of surface layer A solid lubricant that imparts lubricity to the surface of the workpiece is used as the spray material sprayed by the blast processing apparatus of the present invention.

  In addition to oxide solid lubricants such as calcium fluoride, gold, silver, lead, lead monoxide and barium chromate, plastics such as Teflon (registered trademark), MCA (melamine cyanurate), graphite, hexagonal nitriding Examples include boron, diamond powder, new carbon materials such as fullerene, carbon nanotube, and carbon nanohorn, molybdenum disulfide, tungsten disulfide, tin disulfide, mica, fluorinated graphite, and barium fluoride. However, in this embodiment, graphite powder is used as the solid lubricant.

As an example, the graphite powder preferably has a carbon component of 90% or more and a particle size of about 1 to 57 μm, and examples of the graphite powder include natural graphite such as flaky graphite and earthy graphite, and artificial graphite. Any graphite can be used, but in this embodiment, graphite powder called HOP manufactured by Nippon Graphite Trading Co., Ltd. is used. HOP is a graphite powder excellent in lubricity and conductivity, and its apparent density (bulk specific gravity) is 0.15 g / cm ³ . The particle size is distributed within the range of 0.2 to 30 μm, and the average particle size is about 4.0 μm.

  In the present embodiment, the case where a solid lubricant is used as an injection material as described above will be described. However, a desired effect can be obtained by injecting a fine particle injection material onto a workpiece at a high injection speed. If possible, a spray material for forming a coating other than the lubricating layer, a spray material for obtaining effects such as cutting, polishing, shot beaning, and other various purpose spray materials can be used. The application of the present invention is not limited to the injection of solid lubricants.

  For example, aluminum, silicon, magnesium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, neodymium, molybdenum, ruthenium, rhodium, paradium Examples include silver, indium, tin, tantalum, tungsten, platinum, and gold.

  Moreover, what mixed 1 type selected from these metals, or 2 or more types can be used. Moreover, these oxides, those in which oxides and metals are mixed, and those selected from metal oxides or those in which two or more are mixed can be used.

  As an example, alumina, zirconia, silicon nitride, glass, PZT, barium titanate, etc., which are fine-grained ceramics of the injection material # 3000 or more can be used.

  Fine-grained thermoplastic plastics and thermosetting plastics of injection material # 3000 or more can be used. For example, nylon, polycarbonate, polyethylene, polypropylene, polystyrene, vinyl chloride, polymethylmethacrylate, polyacetal, and cellulose acetate can be used as examples.

  By blasting these projection materials with the apparatus of the present invention, a film of the projection material can be formed.

  A particle diameter of about 1 to 57 μm can be used, and preferably # 3000 or more (4.0 μm or less).

  As for the shape, a spherical shape, a polygonal shape, a cylindrical shape, a flake shape and the like can be widely used.

Workpiece As the work piece to be blasted by the spray material injected through the spray nozzle, various materials such as metal, synthetic resin, ceramics, wood, leather, paper, etc. can be used, and its blasting process Can be selected as appropriate depending on the purpose and content of the.

  In the present embodiment, the work piece on which the graphite powder as a solid lubricant is sprayed to form a lubricating layer uses, for example, an aluminum alloy or a metal such as steel having a higher hardness or melting point. Can do. Specifically, SKD11, SUJ2, SKS, and SUS440C can be cited as iron-based materials, and A5056 and A7075 can be listed as aluminum-based materials.

  The SKD11 is a kind of alloy tool steel, which is used for cold dies such as gauges, punching dies and thread rolling dies, and the SUJ2 is a high carbon chromium bearing steel material used for rolling bearings and the like. It is a kind of. The SKS is an alloy tool steel for a cutting tool, and the SUS440C is a martensitic stainless steel and is used for a nozzle, a bearing, and the like.

  The A5056 is an aluminum alloy widely used in various industrial products such as automobiles, and the A7075 is also called ultra-super duralumin, which has excellent mechanical properties such as strength and workability. Used for materials.

  In the present embodiment, a surface lapping finish of these metals is used as a workpiece.

Processing conditions As the injection conditions when the injection material is injected by the blast processing apparatus of the present invention, although depending on the material, particle size, shape, etc. of the injection material, the injection pressure is 0.01 to 5.0 MPa, for example, 0.1 to 1.0 MPa, The injection speed can be 100 to 450 m / sec, for example 180 to 300 m / sec.

  Here, the injection pressure refers to the gas pressure at the injection nozzle inlet, and the injection speed refers to the gas velocity at the injection nozzle outlet. The injection speed does not necessarily coincide with the speed of the injection material injected from the outlet of the injection nozzle, and the speed of the injection material is actually slightly lower than the injection speed. As an example, the speed of the injection material seems to be about 0.8 to 0.9 of the injection speed.

  Further, as other processing conditions, the distance (injection distance) between the workpiece and the injection nozzle is 5 to 300 mm, for example 20 to 200 mm, and the injection time is 1 to 600 sec, for example 20 to 90 sec. It can be changed as appropriate depending on the processing content and processing conditions. It is also possible to perform blasting by repeating a predetermined injection time a plurality of times.

  In this embodiment, graphite powder is injected onto the work piece. In this case, the processing conditions are as follows: the injection pressure is 0.5 to 1 MPa, the injection speed is 220 to 270 m / sec, and the injection distance is 30 to 50. It is preferable that the injection time is 20 to 90 sec.

Compressed gas In the present invention, an inert gas such as nitrogen, air, argon, or helium is preferably used as the compressed gas that passes through the injection nozzle and is injected together with the injection material from the viewpoint of stability.

  When blasting is performed by the blasting apparatus of the present invention, the energy of the compressed gas can be efficiently used because of the direct pressure (FD) blasting. The kinetic energy of the propellant can be converted into the kinetic energy of the propellant more efficiently than the blasted siphon type (or suction type: SF) or gravity type (SG). In the method of forming a film by injecting a spray material onto a workpiece, it is possible to form a film having strong adhesion on the surface of the workpiece as compared with the conventional SF and SG methods. . In addition, since the fine particles are ejected, the dimensional change of the workpiece can be minimized, and it can be used as a member without adjusting the dimensions by post-processing. On the other hand, the above-mentioned graphite injection by the SF, SG type is unstable due to the blockage of the injection material in the circulation system, and uneven injection occurs.

  Using the blasting apparatus 1 of the present invention, a comparative test was performed regarding the stability of spraying and the processing accuracy of the workpiece when the spray material composed of fine particles was blasted.

  The comparative example is a blasting apparatus provided with the injection material pumping device 10 described in Patent Document 1, and the configuration other than the injection material pumping device 10 is the same in both the present invention and the comparative example. The blast nozzle used was a nozzle diameter of 5 mm manufactured by Fuji Seisakusho, the injection pressure was 1.0 MPa, and the injection distance was 150 mm. The work piece was a SUS plate, and the spray material to be sprayed was Green Carborundum GC # 10000 (particle size 0.5 μm) manufactured by Fujimi Spray Company.

  In such a processing test, the jetting stability of the spray material was evaluated from the jetting state from the blast nozzle, and the processing accuracy was evaluated from the processing result of the workpiece, and the results were as follows.

  As can be seen from the above results, according to the blasting apparatus 1 (Example) using the injection material pumping device 10 of the present invention, as described above, even with a very fine injection material having a small particle diameter, A constant amount was stably supplied from the blast nozzle, and the workpiece was not unevenly processed and could be blasted into a desired state.

  On the other hand, in the comparative example, the agglomeration or consolidation of the injection material occurs, and it accumulates in the flow path of the injection material or closes the blast nozzle. As a result, the injection material from the blast nozzle is blocked. There have been problems such as intermittent spraying and uneven machining on the workpiece.

  From the above, according to the injection material pumping device 10 of the present invention, when the injection material having a small particle diameter is pumped, the aggregation and accumulation can be suitably prevented, and the material is pumped to the blast nozzle without generating lumps or the like. Therefore, high injection stability and processing accuracy can be exhibited.

The figure which shows a part of blast processing apparatus in embodiment of this invention. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1. B-B 'line schematic sectional drawing of FIG. The figure which shows one Embodiment of the supply circuit of the compressed gas in this invention. The figure which shows a part of injection material pumping apparatus in another embodiment of this invention. The figure which shows the conventional blast processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blast processing apparatus 2 Injection material tank 3 Casing 5 Spring 6 Dump valve 10 Injection material pressurization apparatus 11 Pressurization tank 11a Upper surface 11b Side wall 11b 'inner wall 11c Bottom surface 12 Stirring part (introduction part of compressed gas for stirring)
13 Supply Pipe 14 Pressurization Pipe (Pressurized Compressed Gas Introduction Pipe)
DESCRIPTION OF SYMBOLS 15 Feed pipe 16 Discharge pipe 17 Cylindrical body 17 'Cylindrical outer wall 18 Vibration generating means 21 Guide plate (an example of guide member)
22 Stirring port 23 Chamber 24 Pressure port 25 Feeding port 28 Guide tube (an example of guide member)
40 Supply circuit (for compressed gas supply means)
41 Common circuit 42 Agitation circuit 44 Pressurization circuit 46 Branch point 48 Injection circuit 51 Solenoid valve (an example of a start delay means)
52 Check valve 53 Air filter 54 Ball valve (an example of pressure adjusting means)
55 Pressure reducing valve 56 Pinch valve 210 Injection material supply device 243 Injection material supply port 245 Pressure tank 246 Feed pipe 248 Injection port 260 Vibration generating means

Claims (23)

A fixed amount of the injection material is introduced from the injection material tank into the cylindrical pressure tank disposed between the injection material tank and the blast nozzle of the blast processing apparatus,
Starting the introduction of the compressed gas for stirring in the accumulation portion of the propellant introduced into the pressurized tank, and stirring the propellant in the pressurized tank,
Start the introduction of compressed gas for pressurization from the side wall of the pressurization tank to pressurize the inside of the pressurization tank,
A method for pumping an injection material, wherein the injection material in the stirring state is pumped to the blast nozzle.   2. The injection material pressure feeding method according to claim 1, wherein the introduction of the pressurized compressed gas into the pressurized tank is started after the introduction of the compressed compressed gas for stirring.   The method of feeding an injection material according to claim 1 or 2, wherein the compressed compressed gas is set to a pressure lower than that of the compressed compressed gas.   The method for feeding a propellant according to any one of claims 1 to 3, wherein a swirling flow along an inner wall of the pressurized tank is generated in the pressurized tank by the compressed gas for pressurization.   A cylinder having a diameter smaller than the inner diameter of the pressurized tank is disposed in the pressurized tank, and the compressed compressed gas is introduced between the inner wall of the pressurized tank and the outer wall of the cylinder to generate the swirling flow. The injection material pumping method according to claim 4, wherein:   The method for feeding a propellant according to any one of claims 1 to 5, wherein vibration is applied to the pressurized tank.   The method for feeding an injection material according to any one of claims 1 to 6, wherein the inside of the pressurized tank is heated.   A blasting method characterized by injecting an injection material pumped by the method according to any one of claims 1 to 7 onto a workpiece.   A blasted product obtained by injecting a finer spray material than the particle size # 3000 (particle size at 50% cumulative height (dv-50 value) 4.0 μm) in the blasting method according to claim 8. A cylindrical pressure tank that is disposed between the blast nozzle and the blast nozzle of the blasting apparatus and introduces the blast material from the blast material tank,
An introduction portion of the compressed gas for stirring that opens in a deposit portion of the propellant introduced into the pressurized tank;
A pressurized compressed gas introduction pipe which opens in the pressurized tank side wall above the opening position of the stirring compressed gas introduction portion;
Providing a feed pipe that opens in the pressurized tank and communicates with the blast nozzle;
An injection material pressure feeding device comprising compressed gas supply means for supplying compressed gas to the introduction section and the introduction pipe.   The compressed gas supply means includes a start delay means for starting the supply of the compressed gas to the pressurized compressed gas introduction pipe after the supply of the compressed gas to the introduction part of the stirring compressed gas. The injection material pumping device according to claim 10.   The compressed gas supply means includes pressure adjusting means for supplying a compressed gas having a pressure lower than that of the compressed gas supplied to the agitation compressed gas introduction portion to the pressurized compressed gas introduction pipe. Item 12. The injection material pumping device according to Item 10 or 11.   The injection material pumping device according to any one of claims 10 to 12, wherein the introduction part of the compressed gas for agitation includes a guide member that opens at a plurality of agitation ports.   The injection material pumping device according to any one of claims 10 to 13, wherein an inner wall of the pressurized tank is provided to be inclined so as to bulge in an outer peripheral direction toward the bottom.   15. The pressurized compressed gas introduction pipe is arranged in a direction in which the compressed compressed gas introduced through the introduction pipe generates a swirling flow along the inner wall of the pressurized tank. An injection material pumping device given in any 1 paragraph.   The swirl derivative is provided on the inner wall of the pressurization tank in a direction in which the compressed gas for pressurization introduced into the pressurization tank generates a swirl flow along the inner wall of the pressurization tank. Item 15. An injection material pumping device according to item 15.   A cylinder having a diameter smaller than the inner diameter of the pressurized tank is disposed in the pressurized tank with a gap from the inner wall of the pressurized tank, and the compressed compressed gas introduced into the pressurized tank is the cylinder. The spray material feeding device according to any one of claims 10 to 16, wherein a swirl flow is generated between the outer wall of the body and the inner wall of the pressurized tank along the inner wall of the pressurized tank.   The injection material pumping device according to claim 17, wherein a bottom portion of the cylindrical body has a substantially inverted conical shape downward.   The injection material pumping device according to claim 17 or 18, wherein a swirling derivative is provided on an outer wall of the cylindrical body in a direction in which the swirling flow is generated.   The injection material pumping device according to any one of claims 15 to 19, wherein the feeding pipe is arranged on an extension of the swirling flow in the swirling direction.   21. The injection material pumping device according to claim 10, further comprising vibration generating means for applying vibration to the pressurized tank.   The injection material pumping device according to any one of claims 10 to 21, further comprising heating means for heating the inside of the pressurized tank. A blasting apparatus comprising the propellant feeding device according to any one of claims 10 to 22.

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