JP6452615B2 - Blasting method and blasting apparatus - Google Patents

Description

  The present invention relates to a blasting method for injecting an abrasive together with a compressed gas to perform cutting, surface polishing, deburring, coating film removal and the like of a workpiece, and a blasting apparatus used in the blasting method.

  Blasting, which processes the workpiece using the cutting force exerted when the abrasive material injected with the compressed gas collides with the workpiece, includes cutting, surface polishing, surface polishing, deburring, and coating. Widely used in various applications such as removal of membranes and removal of dirt such as rust.

  In such blasting, when abrasive material is injected together with compressed gas onto the work piece, static electricity is generated due to the friction caused by the collision with the work piece or the inner wall of the cabinet as the work space. Abrasive material or cutting powder generated by cutting the workpiece adheres to the inner wall of the workpiece, cabinet, and other inner walls of ducts, cyclones, abrasive tanks, etc. that constitute the abrasive circulation system As a result, the abrasive cannot be collected and supplied smoothly.

  In particular, as the demand for microfabrication by blasting increases, the use of abrasives has increased, and as a result, abrasives are more likely to adhere to workpieces and cabinet inner walls due to static electricity. The adhered abrasive is difficult to remove completely by air blow or the like, and it is necessary to provide a cleaning process for removing the abrasive adhered to the workpiece after blasting. It is also a factor.

  In order to prevent such adhesion of abrasives due to static electricity, it may be possible to equip the blasting machine with a voltage application type static eliminator (“ion generator”).

  However, if equipped with such an expensive device, not only will it increase the price of the blasting machine and lose price competitiveness in the market, but it is also installed in the ion generator to generate ions Electrode needles are easily soiled, require frequent maintenance, and static electricity remains where the abrasive is peeled off due to charge removal (neutralization) with the abrasive adhered to the object to be treated.

  Furthermore, since corona discharge is performed for the generation of ions, it can be an ignition source in dust explosions and the like, so the ion generator is structurally unsuitable for use in a blast processing apparatus.

  Therefore, in order to solve such problems caused by static electricity, it has also been proposed to remove static electricity by applying moisture to the working space and the circulation path of the abrasive.

  As an example of such a method, by introducing a compressed gas given moisture by a humidifying means to a blast nozzle for injecting abrasives, the humidity in the circulating system of the abrasives is adjusted to prevent generation of static electricity. Has been proposed (see Patent Document 1 [0011] column, FIG. 2).

  It has also been proposed to supply moisture to the compressed gas introduced into the blast nozzle for abrasive material injection in the form of water vapor using an ultrasonic heater or heating (Patent Document 2 [0026]. ] Column).

  As a blast nozzle used for wet blasting for the purpose of preventing the generation of dust, compressed gas, abrasive (media) and water are mixed in approximately equal amounts by weight in a chamber formed inside. A blast nozzle that injects a three-phase flow of gas, liquid, and solid (abrasive material) has also been proposed (see Patent Document 3, [0006], FIG. 1, FIG. 2, and Table 1 [3]).

Japanese Patent No. 3846842 Japanese Unexamined Patent Publication No. 2011-237378 Japanese Unexamined Patent Publication No. 2006-297568

  Among the conventional techniques described above, the blasting method using the blast nozzle described in Patent Document 3 is a method in which a large amount of water of 160 to 200 cc / min is injected (Patent Document 3, Table 1 [2] [ 3]), which is a kind of wet blasting method commonly called “wet blasting” or “liquid honing”.

  When the workpiece is processed by such a wet blasting method, the surface of the workpiece is wetted by the sprayed water, so that generation of static electricity can be reduced.

  However, when a workpiece is processed by such a wet blasting method, the surface of the workpiece is surely wetted. It cannot be applied to the work piece, and there is a case where the work piece needs to be washed or dried after the work, and these operations contribute to a decrease in productivity.

  In addition, in such a wet blasting method in which the abrasive is sprayed with a large amount of water, the collision energy when the abrasive collides with the surface of the workpiece is absorbed by the presence of water sprayed with the abrasive. Therefore, wet blasting has a lower processing amount (cutting speed) than dry blasting, and the conditions such as abrasive material used, particle size, and injection pressure are the same. In some cases, the amount of machining (cutting amount) is reduced to about 1/7 to 1/14 in wet blasting compared to dry blasting.

  As an example, FIGS. 23 and 24 show the measurement of the difference in coverage between dry blasting and wet blasting. Both dry and wet abrasives are alumina-based abrasives ("Fuji Random WA" manufactured by Fuji Seisakusho). # 1000) and a 150 mm square glass plate was processed at an injection pressure of 0.3 MPa.

  FIG. 23 shows a change in processing time until the coverage becomes 100% with respect to a change in the distance between the tip of the blast nozzle and the workpiece (nozzle distance), and FIG. 24 shows a coverage with respect to a change in the particle size of the abrasive. The change in the processing time is displayed, and it can be seen that the processing time for obtaining 100% coverage is longer in wet blasting than in dry blasting under any conditions. .

  Here, “coverage” is the ratio of the total indentation area to the processing area expressed in%, and the amount of processing can be predicted by the size of the coverage. Therefore, from FIG. 23 and FIG. Then, it turns out that it is inferior in the amount of processing (cutting speed) compared with dry blasting.

  In contrast to wet blasting as described above, the blasting method described in Patent Document 1 described above increases the humidity in the cabinet, which is the work space, by adding moisture to the compressed gas that injects the abrasive. This prevents the generation of static electricity and the adhesion of abrasives to the workpiece surface and cabinet inner surface due to static electricity.

  However, in the blast processing apparatus described in Patent Document 1, water is added to the compressed air flowing in the compressed air supply pipe provided between the compressed air supply source and the blast nozzle. The compressed air flowing through the air supply pipe has a slower flow velocity than the compressed air flowing through the small diameter flow path in the blast nozzle. Therefore, even if water is introduced into the compressed air introduction pipe, Is introduced into the blast nozzle in a liquid state without being sprayed due to collision with the compressed air flow, causing clogging of the blast nozzle by agglomerating the abrasive and causing blast processing. The device will not work properly.

  Therefore, Patent Document 1 does not include a detailed description of the water addition method, but when water is added to the compressed air flowing in the compressed air introduction pipe, such a malfunction due to clogging does not occur. As described in Patent Document 2, it is necessary to add water to the compressed gas in the form of water vapor by a method such as ultrasonic wave or heating, and thus has a function to turn water into water vapor. It is necessary to provide a moisture providing mechanism separately, which makes the apparatus configuration complicated and expensive.

  As described above, in the methods described in Patent Documents 1 and 2, although moisture is added to the compressed gas before being introduced into the blast nozzle, the moisture is added in the state of water vapor (gas). The fluid ejected from the nozzle does not contain “liquid”. Therefore, the inventions described in Patent Documents 1 and 2 are maintained to be “dry” blasting even by adding water.

  Therefore, the methods described in Patent Documents 1 and 2 can perform processing without wetting the surface of the workpiece, and can be applied to a workpiece that dislikes contact with water. There is an advantage that the processing amount (cutting speed) is larger than blast processing.

  However, in the blasting methods described in Patent Documents 1 and 2, if the amount of water to be supplied is small and the processing chamber cannot be sufficiently humidified, the generation of static electricity cannot be sufficiently prevented, but saturation occurs. Supplying water that exceeds the amount of water vapor will cause condensation in the work space and wet the surface of the workpiece or the inner wall of the cabinet, preventing the generation of static electricity but losing the benefits of dry blasting.

  Therefore, in the blasting method described in Patent Document 1, the humidity in the processing chamber is detected, the necessary amount of moisture is calculated and moisture is supplied, and the control is extremely complicated. Complicated and expensive.

  As described above, the inventions described in Patent Documents 1 and 2 maintain dry blasting, and thus maintain a large machining amount (high cutting speed) compared to wet blasting, while maintaining static electricity. However, in order to do so, it is necessary to adopt a special device configuration and to perform complicated control.

  On the other hand, as described in Patent Document 3, in wet blasting, the generation of static electricity can be greatly reduced without complicated control by a relatively simple device configuration, but the workpiece In addition to reducing the productivity, the addition of these processes not only reduces the productivity but also reduces the amount of processing (cutting) compared to dry blasting. In this respect, workability and productivity are greatly inferior, and there are advantages and disadvantages in adopting either method.

  In view of the above points, the inventors of the present invention have conducted intensive research aimed at realizing a blasting process capable of preventing the generation of static electricity without sacrificing the processing amount. It is possible to suppress the generation of static electricity by performing atomization just before the nozzle outlet and limiting the amount of water added to a predetermined range that is significantly smaller than that of known wet blasting. Rather, it was found that the machining amount can be greatly improved.

  Moreover, the increase in the processing amount obtained by this processing method is not only increased in comparison with wet blasting, but also surprisingly greatly improved in comparison with dry blasting. At the same time, it has been confirmed that not only the processing amount is improved, but also various other effects which cannot be expected from Patent Document 1 can be obtained in a superimposed manner.

  The present invention was made on the basis of the above findings obtained by the inventors as a result of earnest research, and can be applied to the existing dry-type blasting machine with a slight structural change. An object of the present invention is to provide a blasting method and a blasting apparatus that can not only prevent the occurrence of the above-described problem but also improve the processing amount (cutting speed) in comparison with dry blasting as well as conventional wet blasting.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, it is used in a limited manner for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, the blasting apparatus 1 of the present invention comprises:
In a blasting apparatus 1 for injecting a compressed gas flow supplied from a compressed gas supply source (not shown) from a blast nozzle 8 as a mixed fluid with an abrasive,
The blast nozzle includes a nozzle tip 82 in the jet direction of a jet 83 communicating with a compressed gas supply source, and includes an abrasive introduction chamber 85 communicated between the jet 83 and the nozzle tip 82 with an abrasive supply source. A suction-type blast nozzle that generates a negative pressure in the abrasive introduction chamber by injecting a compressed gas flow from and sucks the abrasive from the abrasive supply source and injects it as a mixed fluid;
One end of the blast nozzle 8 can be communicated with a liquid supply source (not shown), and the other end is opened in a flow path of the compressed gas in the blast nozzle 8 or an injection port of the blast nozzle. A liquid introduction path 88 is provided for causing the liquid introduced from the liquid supply source to collide with a compressed gas flow flowing in the blast nozzle or a compressed gas flow ejected from the blast nozzle to be atomized;
Between the liquid introduction path 88 and the liquid supply source, there are provided flow rate control means such as a flow rate adjusting valve 7 and a pump,
The liquid introduction path 88 is formed by a pipe line concentrically inserted in the compressed gas flow path 86 provided in the jet 83, and the other end (tip 88a) of the liquid introduction path 88 is connected to the jet 83, which is opened in a compressed gas flow path 86 provided in 83, or in a position in front of the jet 83 of the jet 83 (Claim 1) .

  In addition to the so-called “water” such as tap water, pure water, purified water, alkaline ionized water, etc., the above-mentioned liquid includes pure water and hard water with a scale remover added for the purpose of scale removal, and marking of processed parts. For example, paints or fluorescent paints added may be included.

The blasting apparatus 1 having the above-described configuration may be provided with a liquid constant supply means such as a pump for supplying a constant amount of liquid from the liquid supply source to the liquid introduction path 88 (Claim 2 ).

The configuration of the present invention described above, according to the blanking last processing apparatus of the present invention, it was possible to obtain a remarkable effect below.

  A liquid such as water collides with the compressed gas flowing through the blast nozzle 8 or the compressed gas ejected from the blast nozzle 8, and the amount of liquid introduced into the blast nozzle is 0.06 to 150 cc / min. Therefore, the atomized liquid is reduced between the blast nozzle 8 and the workpiece W due to a pressure drop when sprayed by the blast nozzle 8 and heat generated when the abrasive material collides with the workpiece W. In this space, or in the surface of the workpiece W, the water rapidly evaporates to become water vapor, so that the humidity in the processing chamber 21 can be increased and the generation of static electricity can be prevented.

  Moreover, in spite of such prevention of static electricity generation, the workpiece W is not wetted, or even if the workpiece is wetted, the degree of wetting is less than that of known wet blasting. This blasting method can be applied to workpieces and the like that dislike contact with water by adjusting the water supply conditions, and there is no need to add new steps such as washing and drying after processing.

Furthermore, in the blasting apparatus of the present invention, in addition to the effect of preventing the generation of static electricity as described above, the effect of improving the processing amount (cutting speed) higher than that obtained by the known dry blasting method is first mentioned. Prevents abrasive material from sticking to the surface, reduces consumption of abrasive material, improves cutting speed, removal efficiency of coating film, burrs, etc., reduces the elongation and warpage of the workpiece, reduces the temperature rise of the workpiece We were able to obtain new effects beyond expectations, such as reducing the burning of the product.

  The reason why such an effect such as an increase in the cutting speed is obtained is not clear, but it is likely that the liquid sprayed in the state of being atomized by the collision with the compressed gas flow is abrupt when it exits the blast nozzle. Micro-mist is further reduced by the pressure drop, and suddenly evaporates in the front space of the work piece or on the surface of the work piece due to contact with the work piece generated by collision with the abrasive. This is considered to be an effect obtained by taking a large amount of heat of vaporization from the surface of the air or workpiece (spray cooling).

  That is, considering the improvement of the machining amount (cutting speed) as an example of the effects described above, wet blasting is one of the reasons why the machining amount (cutting speed) is lower than dry blasting. It is considered that water sprayed with the abrasive forms a water film on the surface of the workpiece, and this water film absorbs the collision energy of the abrasive that tries to collide with the surface of the workpiece. It is done.

However, in this onset bright, liquid injected by atomization in order to evaporate quickly exits the blast nozzle 8 as described above, without wetting the workpiece, or wet the surface of the workpiece However, since the degree of wetting is less than that of known wet blasting, it is possible to maintain the same collision energy as dry blasting, and as a result, a large amount of processing can be maintained even by liquid injection.

  On the other hand, in comparison with dry blasting, in dry blasting, the surface temperature of the workpiece rises due to the collision of the abrasive, and this temperature increase softens the surface of the workpiece and absorbs the collision energy of the abrasive. This is thought to contribute to the reduction in cutting speed.

In this onset bright contrast, increase in the surface temperature of the workpiece is suppressed by spraying the cooling described above, a result of processing is performed in a state in which the surface hardness of the workpiece is maintained, compared to the dry blasting It is considered that the amount of machining (cutting speed) was also improved.

This onset bright described above, with respect to configuration of an existing dry blasting machine, the replacement of the blast nozzle 8 to allow injection of the liquid described above, the liquid supply for supplying liquid to the blast nozzle 8 This can be realized by a relatively simple structural change of adding a flow rate control means such as a flow rate adjusting valve 7 and a pump for controlling the supply amount of the liquid to the source and the blast nozzle 8.

  Further, a pipe inserted concentrically into the compressed gas flow path 86 provided in the jet 83 of the blast nozzle 8 is used as the liquid introduction path 88, and the other end (tip 88a) of the pipe 88 is connected to the jet 83. In the configuration that opens at the injection port, it is possible to introduce the liquid through the liquid introduction path 88 by the negative pressure generated by the injection of the compressed gas from the jet 83. Separately, a liquid such as a pump is used. It is not necessary to provide a means for supplying the liquid, and since the introduction and stop of the liquid are performed in conjunction with the start and stop of the introduction of the compressed gas to the blast nozzle 8, the supply of the liquid is performed. There is no need to provide a separate means for starting and stopping, and the existing equipment can be used by replacing only the jet 83 of the blast nozzle 8.

  Of course, a configuration may be adopted in which a constant supply means such as a pump for supplying the liquid from the liquid supply source to the liquid introduction path 88 is provided. In this case, the design of the liquid introduction position with respect to the blast nozzle 8 may be adopted. As the degree of freedom increases, the liquid can be supplied more stably and reliably.

Explanatory drawing which shows the example of 1 structure of the blast processing apparatus of this invention. It is explanatory drawing of the blast nozzle provided in the blast processing apparatus of this invention, (A) is sectional drawing of the whole blast nozzle, (B) is explanatory drawing which shows the modification of a nozzle tip. It is explanatory drawing of the liquid introduction position with respect to a blast nozzle (suction type), (A) is a liquid introduction position with respect to the blast nozzle provided with the general nozzle tip, (B) is a case where a double nozzle tip is provided. Explanatory drawing of an introduction position. It is explanatory drawing of the liquid introduction position with respect to a blast nozzle (direct pressure type), (A) is the liquid introduction position with respect to the blast nozzle provided with the general nozzle tip, (B) is a case where a double nozzle tip is provided. Explanatory drawing of an introduction position. Sectional drawing of another blast nozzle provided in the blast processing apparatus of this invention. The graph which showed the change (boron board) of the processing amount with respect to the change of water supply amount. The graph which showed the change (carbide board) of the processing amount with respect to the change of water supply amount. The graph which showed the change (urethane rubber board) of the processing amount with respect to the change of water supply amount. The graph which showed the change of the amount of processing (aluminum board) with respect to the change of the amount of water supply. The graph which showed the change of the amount of processing (stainless steel board) with respect to the change of the amount of water supply. The graph which showed the change (steel plate) of the processing amount with respect to the change of water supply amount. The graph which showed the change (acrylic board) of the processing amount with respect to the change of water supply amount. The graph which showed the change (epoxy glass board) of the processing amount with respect to the change of water supply amount. The graph which showed the change (granite) of the processing amount with respect to the change of the amount of water supply. The graph which showed the change (urethane rubber) of the amount of piercing of the abrasives with respect to the change of the amount of water supply. The graph which showed the change (stainless steel) of the amount of sticking of an abrasives with respect to the change of the amount of water supply. The graph which showed the change (iron) of the amount of piercing of the abrasives with respect to the change of the amount of water supply. The graph which showed the change (acrylic) of the amount of sticking of an abrasive | polishing material with respect to the change of water supply amount. The graph which showed the change (epoxy glass) of the amount of stabs of the abrasives with respect to the change of the amount of water supply. Photograph of the particle structure of the abrasive used in the present invention blast machining of the abrasive was used (Example), dry blasting method (Comparative Example). A surface roughness data of the polycarbonate product after removal of the coating in blasting, (A) (Example) those treated by the present application, (B) those treated with dry blasting (Comparative Example). A surface roughness data of the polyphenylene San sulfide product after deburring treated with blasting, (A) those treated with the present application (Example), (B) those treated with dry blasting (Comparative Example) . The correlation diagram which showed the change of time until it becomes 100% of coverage with respect to the change of nozzle distance. The correlation figure which showed the change of time until it becomes 100% of coverage with respect to the particle size change of an abrasives.

  Next, embodiments of the present invention will be described below with reference to the accompanying drawings.

1. Blast Processing Device (1) Overall Configuration FIG. 1 shows a configuration example of the blast processing device 1 of the present invention.

  As shown in FIG. 1, the blast processing apparatus 1 includes a compressed gas supply source (not shown), an abrasive tank 3 as an abrasive supply source, and a compressed gas introduced from the compressed gas supply source and the abrasive. A blast nozzle 8 is provided for merging and injecting abrasives from the tank 3. In the illustrated embodiment, a blast nozzle is introduced by introducing compressed gas from a compressed gas supply source, in this embodiment, compressed air. 8 is configured as a so-called “suction type” blasting device in which the abrasive material from the abrasive material tank 3 is sucked by the negative pressure generated in the air 8, merged with the compressed gas flow, and injected to the workpiece W. Yes.

  In the illustrated embodiment, a processing chamber 21 formed in the cabinet 2 that accommodates the blast nozzle 8 and a hopper formed at the lower end of the processing chamber 21 communicated with each other through an abrasive recovery pipe 91. The above-mentioned abrasive tank 3 that is a cyclone and a dust collector 5 that sucks the inside of the abrasive tank 3 are provided, and the exhaust fan 6 provided in the dust collector 5 is operated to suck the inside of the abrasive tank 3 that is a cyclone. However, when the abrasive is sprayed from the blast nozzle 8 accommodated in the processing chamber 21, the sprayed abrasive is introduced into the abrasive tank 3 through the abrasive recovery pipe 91 together with the cutting powder and the like, and the abrasive tank 3 The reusable abrasive is collected at the bottom of the abrasive tank 3 by the wind sorting inside, and the crushed abrasive and dust are sucked into the dust collector 5 and removed. Made which are, so that it can be recycled abrasive.

  However, the basic configuration of the blast processing apparatus 1 is not limited to the circulation type configuration in which the abrasive is circulated in this way. For example, the blast processing apparatus 1 is a single-use disposable batch without reusing the used abrasive. In this case, the configuration provided for the wind separation of the dust such as cutting powder and the abrasive is omitted, and the abrasive after use in the processing chamber 21 by the dust collector 5 is omitted. Or dust may be removed and collected together.

  In the illustrated example, the blasting apparatus is described as being configured as a suction type. For example, a direct pressure type blasting apparatus that introduces and injects both compressed gas and abrasive in a pressurized tank into a blast nozzle. On the other hand, the present invention can be applied, and various structures employed in known blasting apparatuses can be adopted as the basic configuration of the blasting apparatus.

  In the blasting apparatus 1 of the present invention, liquid, in this embodiment, water is introduced into the blast nozzle 8 described above, and this water is collided with a compressed gas flow flowing in the blast nozzle 8 to have an average particle diameter of 1 mm. In the following, the atomized liquid is preferably atomized to 300 μm or less, more preferably 100 μm or less, and the atomized liquid is mixed into the compressed gas immediately before being injected to the workpiece W. On the other hand, the atomized liquid can be sprayed together with the abrasive.

  As described above, the blasting apparatus 1 of the present invention supplies the liquid (water) to the blast nozzle 8 described above so that the atomized liquid can be mixed into the compressed gas injected toward the workpiece W. For this purpose, a liquid supply source (not shown) is provided, a liquid introduction path 88 for introducing water supplied from the liquid supply source into the blast nozzle 8 is provided in the blast nozzle 8, and the liquid supply source described above is further provided. A flow rate control means including a flow rate adjusting valve 7 and a pump is provided in a pipe line communicating between the liquid introduction path 88 of the blast nozzle 8.

(2) Blast Nozzle FIG. 2 shows a configuration example of the blast nozzle 8 provided in the blast processing apparatus 1 of the present invention.

  The blast nozzle 8 shown in FIG. 2 has a basic structure provided in an existing suction type blast nozzle, and includes a body 81 that forms a main body of the blast nozzle 8, a nozzle tip 82 and a jet 83 attached to the body 81. It is configured.

  The body 81 has a substantially cylindrical container shape formed in communication with the abrasive material introduction port 84 for introducing the abrasive material supplied from the abrasive material tank 3 which is a supply source of the abrasive material. The abrasive introduction chamber 85 is provided inside.

  The nozzle tip 82 attached to the body 81 has a conical inner surface 82a constricted in a conical shape, and is formed in the body 81 by attaching the nozzle tip 82 to the front end side of the body 81. The abrasive material introduction chamber 85 and the flow path in the nozzle tip having the conical inner surface 82a are configured to communicate with each other.

  As shown in FIG. 2B, the nozzle chip 82 may be not only one having a circular opening (round shape) but also one having a slit-like opening (slit type). The shape of the flow path formed inside may be a Venturi type shape that once narrows from the inlet side and then spreads again toward the outlet side.

  A jet 83 is attached to the rear end side of the body 81 with the front end directed toward the center of the conical inner surface 82 a of the nozzle tip 82, and a compressed gas from a compressed gas supply source (not shown) is injected from the jet 83. Then, the abrasive material from the abrasive material tank 3 is sucked into the abrasive material introduction chamber 85 by the negative pressure generated by the jet gas compressed by the jet 83, and this abrasive material joins the compressed gas ejected from the jet 83. Thus, the nozzle tip 82 can be ejected from the tip thereof in common with the known suction type blast nozzle 8.

  In the blast nozzle 8 used in the blasting apparatus 1 of the present invention, the liquid from the liquid supply source (not shown) is supplied so that the liquid can be atomized and sprayed as described above. A liquid introduction path 88 for introduction into the blast nozzle 8 is provided, and a distal end 88a of the liquid introduction path 88 is provided with a compressed gas flow path provided in the blast nozzle 8, for example, a compressed gas provided in the jet 83. The flow path 86 of the jet 83, the front of the discharge port of the jet 83, the flow path in the nozzle tip 82, and further the jet port of the blast nozzle, and the jet flow from the blast nozzle 8 or jet from the blast nozzle 8 By causing the liquid to collide with the high-speed compressed gas flow, the liquid can be atomized and sprayed.

  In the present invention, the liquid ejected from the tip 88a of the liquid introduction path 88 is made to collide with the high-speed compressed gas flow and atomize, so that the liquid can be atomized more suitably. You may install a mesh material in opening of the front-end | tip 88a of the introduction path 88. FIG. Thereby, after the liquid supplied from the liquid introduction path 88 passes through the mesh material and is once atomized, the liquid is further atomized by colliding with the high-speed compressed gas flow.

  The mesh material used in the present invention is not particularly limited. For example, the mesh material is formed as a whole by knitting a wire made of metal or resin into a mesh shape, or by forming fine holes in a plate. Various things can be used.

  In the embodiment shown in FIG. 2, the conduit that becomes the liquid introduction channel 88 is concentrically disposed in the compressed gas channel 86 formed in the jet 83, and the inner wall of the compressed gas channel 86 and the liquid The compressed gas is allowed to flow between the outer walls of the introduction path 88, the tip 88 a of the liquid introduction path 88 is opened at the same position as the opening of the jet 83, and the liquid discharged from the tip 88 a of the liquid introduction path 88 is removed. , It is atomized by colliding with a high-speed, high-pressure compressed gas flow that flows on the outer periphery.

  With this configuration, in the blast processing apparatus 1 of this embodiment, the liquid is sucked from the tip 88a of the liquid introduction path 88 due to the negative pressure generated in the abrasive introduction chamber 85, and merges with the compressed gas flow. Therefore, the liquid is supplied in the blast nozzle 8 without providing a liquid fixed quantity supply device such as a pump for supplying the liquid from a liquid supply source (not shown) such as a liquid tank into the blast nozzle 8. In addition to being able to atomize, the introduction of liquid from the liquid supply source automatically starts and stops in conjunction with the start and stop of the introduction of compressed gas to the blast nozzle 8. No dripping or the like due to forgetting to stop.

  The configuration in which the liquid collides with the compressed gas flow is not limited to the configuration shown in FIG. 2, and various known gas blast type two-fluid nozzle (atomizer) configurations are applied to the jet 83 configuration. In addition, the liquid introduction into the blast nozzle may be performed by using a liquid metering means such as a pump instead of the configuration using the negative pressure in the abrasive introduction chamber as described above. It is good also as what is performed by providing in the inside of the tank which is or in piping between a liquid supply source and a blast nozzle.

  The liquid supply position for the blast nozzle 8 may be different from the position shown in FIG. 2, and as an example of the liquid introduction position for the suction type blast nozzle, as shown in FIG. 8 is formed in the outer periphery of the front end of the jet 83, and the liquid introduction path 88 is formed. The space is opened in the forward direction of the jet 83, and the liquid is introduced into the liquid introduction path 88. The liquid thus injected may be sprayed so as to wrap around the outer periphery of the compressed gas injected from the jet 83 so that the liquid collides with a high-speed, high-pressure compressed gas flow to be refined.

  Further, as shown in FIG. 3A, the tip 88a of the liquid introduction path 88 is opened at the position where the abrasive introduction chamber 85 and the blast nozzle 8 are formed, and the liquid is generated by the negative pressure generated by the compressed gas flow. The liquid in the introduction path 88 may be sucked so as to collide with the compressed gas flow flowing in the blast nozzle 8, or the compressed gas flow injected from the blast nozzle 8, or formed in the jet 83. The liquid of the liquid supply source may be quantitatively supplied by a pump into the compressed gas flow path or the compressed gas flow path formed in the nozzle tip 82, see FIG. 2 (A) and FIG. In place of the liquid introduction position described above, or together with the liquid introduction position described with reference to FIGS. 2A and 5, any one or a plurality of liquid introduction positions shown in FIG. Liquid from It may be so.

  In addition, as shown in FIG. 3B, the nozzle chip 82 is configured such that two divided nozzle chips 821 and 822 are continuously arranged coaxially in the longitudinal direction to form a small-diameter channel. When a fluid is introduced from the nozzle tip 821 toward the nozzle tip 822 in which a large-diameter channel is formed, air is sucked through an air passage 823 formed at the boundary portion between the two nozzle tips 821 and 822, and the abrasive material It is also possible to adopt a configuration in which the liquid is combined with the flow and ejected. When liquid is introduced into the nozzle tip 82 having such a structure, the liquid is introduced into the air passage 813 provided in the nozzle tip 82. You may do it.

  Further, as a liquid introduction position for the direct pressure type blast nozzle, as shown in FIG. 4A, the tip 88a of the liquid introduction path 88 is opened at the formation position of the injection port of the blast nozzle 8, and the compressed gas is injected. The liquid in the liquid introduction path 88 may be sucked by the negative pressure generated in association with the compressed gas ejected from the blast nozzle 8, or provided in the blast nozzle main body 81 ′. The tip 88a of the liquid introduction path 88 is opened in the compressed gas passage in the jet 83 'or in the compressed gas passage formed in the nozzle tip 82' attached to the tip of the blast nozzle 8. From the liquid supply source The liquid may be introduced into the blast nozzle 88 by a pump, and the liquid can be introduced through any one or more of them. .

  Also in the configuration of such a direct pressure type blast nozzle, as shown in FIG. 4 (B), nozzle chips 821 'and 822' divided into two in the longitudinal direction as nozzle chips 82 'are continuously arranged on the same axis. In this case, the liquid may be introduced through the air passage 823 ′ provided at the boundary between the two nozzle tips 821 ′ and 822 ″.

Incidentally, the conduit leading to the liquid introduction path 88 from the liquid supply source, a flow control means for controlling the flow rate of the liquid introduced to the liquid introduction path 88 is provided, the liquid introduced to the blast nozzle 8 The amount is adjustable.

  In the present embodiment, the flow rate adjusting valve 7 is provided as the flow rate control means in the pipe between the liquid introduction path 88 having the tip 88a opened at the position where the negative pressure is generated and the liquid supply source. In the present embodiment, the flow rate adjusting valve 7 has an opening that can be adjusted in eight steps. However, a valve that can adjust the opening steplessly may be used to adjust the flow rate of the liquid. Various valves can be used if possible.

  Also, a pump is provided as the above-described flow rate control means between the liquid introduction path 88 having the tip 88a opened at a position other than the position where the negative pressure is generated and the liquid supply source, and the operation speed of this pump, for example, a motor for driving the pump The amount of liquid supplied to the blast nozzle 8 can be controlled by controlling the rotation speed.

  Even when the leading end 88a of the liquid introduction path 88 is opened at the position where the negative pressure is generated, the modified examples in FIGS. 3A and 4A are provided between the liquid introduction path 88 and the liquid supply source. As shown in the figure, a configuration in which a pump is provided may be employed, and in the configuration in which a pump is provided, a flow rate adjusting valve is provided on the secondary side of the pump, whereby the flow rate of the liquid introduced into the blast nozzle 8 is controlled. It may be adjusted.

  Furthermore, without providing a container such as a liquid tank as a liquid supply source, the liquid introduction path 88 can be communicated with a water supply intake (faucet) so that the water supply can be used as a liquid supply source. By introducing the liquid into the liquid introduction path 88 using the feed water pressure, the above-described installation of the pump can be omitted.

2. The operation of the blast processing apparatus 1 shown in FIG. 1 configured as described above is provided with the blast nozzle 8 shown in FIG. 2 as an example.

  The abrasive is supplied into the abrasive tank 3 as an abrasive supply source, and a liquid tank (not shown) as a liquid supply source is filled with a liquid such as water. In this state, the abrasive tank 3 is illustrated with respect to the blast nozzle 8. The introduction of compressed gas from the compressed gas supply source is started.

  In this way, when the introduction of the compressed gas is started, a high-speed compressed gas is ejected from the tip of the jet 83 of the blast nozzle 8 to generate a high-speed air flow in the nozzle tip 82 in the direction of the ejection port. .

  Therefore, as a result of being drawn by the flow of such compressed gas and sucking the gas in the abrasive introduction chamber 85 into the nozzle tip 82, the inside of the abrasive introduction chamber 85 becomes negative pressure, and the abrasive introduction port 84. Abrasive material from the abrasive material tank 3 is introduced into the abrasive material introduction chamber 85 through this, and this negative pressure sucks out the liquid in the liquid introduction channel 88 from the tip 88a of the liquid introduction channel 88 and sucks it out. The liquid is atomized by the high-speed compressed gas blown out from the jet 83 and mixed in the compressed gas, mixed with the abrasive in the compressed gas, and sprayed from the blast nozzle 8.

In the treatment according to the present invention, a suitable abrasive injection amount is 2 g / min to 20 kg / min, whereas the amount of liquid introduced into the blast nozzle 8 is a relatively small amount of 0.06 cc to 150 cc / min. The liquid jetted together with the abrasive is atomized by the collision with the high-speed compressed gas flowing in the blast nozzle 8 and sprayed from the blast nozzle 8, so that the jet jetted from the blast nozzle 8 The liquid sprayed between the blast nozzle 8 and the workpiece W is coupled with the fact that the pressure of the gas suddenly decreases and the surface of the workpiece is heated due to collision with the abrasive. It evaporates in the space or the surface of the workpiece W and takes a large amount of heat of vaporization from the space and the surface of the workpiece W.

As a result, when performing blasting treatment with the present invention, not only the generation of static electricity can be prevented by an increase in humidity caused by the evaporation of the liquid, without spraying liquid, as compared to the general blasting , It is considered that effects such as improvement of cutting speed, removal efficiency of coating film and burrs, prevention of abrasive sticking to the surface of the workpiece W, prevention of warpage and elongation of the workpiece, etc. .

That is, in the treatment according to the present invention, water is jetted, but the jetted water evaporates quickly as described above. Therefore, even if the surface of the workpiece is not wetted, the degree is known. The amount of water film that absorbs the collision energy of the abrasive is suppressed from being formed on the surface of the workpiece.

  On the other hand, although the formation of the water film described above is suppressed, since the sprayed water loses a large amount of heat of vaporization when it evaporates, the increase in the surface temperature of the work piece is suppressed. Compared to dry blasting, which can cause such softening as a result of suppressing the absorption of collision energy of abrasives due to softening of the surface of the workpiece, the coating film formed on the surface of the workpiece to be removed, burrs, etc. Even in this case, it is considered that the processing amount can be improved and the removal efficiency of the coating film and burrs can be improved.

  Similarly, the above-mentioned piercing of the abrasive is also considered to occur because the surface of the workpiece is softened as the temperature rises, so that the injected abrasive is likely to pierce the surface of the workpiece.

  Furthermore, the elongation and warpage that reduce the dimensional stability of the product are also considered to be caused by the difference in elongation between the workpiece and the front and back surfaces due to temperature rise.

  Therefore, it is considered that the above effect was obtained by performing blasting by the method of the present invention and suppressing the wetting and temperature rise of the workpiece.

In the treatment according to the present invention, the principle is unknown, but the recovered abrasive is less cracked and chipped and the wear rate of the abrasive is also reduced compared to the conventional blasting performed without spraying the liquid. It has been confirmed that it can be done.

In this way, the treatment according to the present invention can effectively prevent the occurrence of sparks caused by static electricity during processing , and can eliminate the breakage and loss of products, particularly products such as electronic parts. It was also possible to eliminate damage to the electrodes provided on the product.

  In addition to preventing the product from being charged, it is also possible to prevent static electricity from being charged in the circulating system of abrasives, the inner wall of the cabinet, the inner wall of the duct, and the like. Abrasion material is prevented from adhering to the inside of the tank 3, and the abrasive material adhering to the cyclone type abrasive tank 3 collides with the abrasive material in the swirling flow, thereby reducing the amount of abrasive material flowing into the dust collector without being recovered. Effects such as improvement in recovery efficiency could also be obtained.

In addition, the treatment according to the present invention not only has the effect of preventing the generation of static electricity, but also improves the processing amount, improves the removal efficiency of coating films and burrs, reduces the surface roughness, compared with general dry blasting, Effects such as prevention of discoloration due to scorching, prevention of sticking of abrasives that become contaminants during coating and plating after blasting, prevention of warpage and elongation of workpieces that reduce dimensional stability of products It was possible to obtain an excellent effect that could not be predicted from the conventional technology.

The result of the confirmation test that the effects described above are obtained by the present invention is shown below.

  As a blasting apparatus, both dry blasting (comparative example) and blasting of the present invention (example) are performed using a suction type blasting apparatus (see FIG. 1 for an outline of the structure) and liquid ( In the blasting process of the present application in which blasting is performed while supplying water), the liquid introduction path 88 is provided in the compressed gas flow path 86 of the jet 83 as described with reference to FIG. 5 or the one provided with a chamber serving as a liquid introduction path 88 on the outer periphery of the tip of the jet 83 as described with reference to FIG. 5, while dry blasting (comparative example) 2) is measured by injecting an abrasive without supplying water to the blast nozzle shown in FIGS. 2A and 5 or a blast nozzle having a general jet [FIG. Was measured perform blasting using what from the jet 83 of blasting nozzle having a structure shown in A) of the structure to remove the liquid introduction path 88].

(1) Confirmation of antistatic effect The amount of charge when an acrylic plate (100 × 100 × 5 mm) was blasted was measured.

  Nylon beads (NB) # 0303 (average particle size 300 μm) manufactured by Fuji Seisakusho were used as the abrasive, and the abrasive was sprayed at a nozzle distance of 160 mm, an injection pressure of 0.3 MPa, and an injection time of 40 minutes. .

  The processing is performed by attaching the blast nozzle described with reference to FIG. 2A to the circulating blast processing apparatus having the structure shown in FIG. 1 and adjusting the amount of water introduced into the blast nozzle 8. 7 is gradually opened from the fully closed state to increase the amount of water supply, measure the change in the charge amount of the acrylic plate (measuring instrument: 709STATIC SENSOR made by 3M), change in temperature and humidity in the processing chamber, The state in the processing chamber was observed. The measurement results are shown in Table 1.

  From the above results, the amount of charge can be reduced by 40% or more just by supplying a small amount of water of 0.06 cc / min with respect to the amount of charge in dry blasting performed with no water supply with the flow control valve 7 fully closed. It has been confirmed that high static electricity prevention effects can be obtained even by spraying a relatively small amount of water.

  Thereafter, as the amount of water supplied was increased, the amount of charge further decreased, and at 15.0 cc / min, a decrease of 90% or more was observed with respect to the amount of charge during no water supply.

Also, in blasting with no flow of water with the flow control valve 7 fully closed, the blasted cabinet has an abrasive material all over the surface of the workpiece, the inner wall of the cabinet, the surface of the rubber hose and blast nozzle, etc. In the cabinet after blasting with the device of the present invention, the deposit of abrasive on the stepped part of the wall surface was confirmed, but the adhesion of the abrasive due to static electricity was confirmed. I couldn't.

(2) Confirmation of increase in machining volume (cutting speed)
(2-1) Measurement of machining amount change with respect to change in water supply amount Using the blast nozzle shown in Fig. 2 (A), adjusting the opening of the flow control valve to change the water supply amount to the blast nozzle, The change of the machining amount (cutting amount) was measured.

  The measurement was performed on a test piece of the material shown in Table 2 below, using an injection distance of 120 mm, an abrasive material of alumina abrasive (“Fuji Random A # 60” manufactured by Fuji Seisakusho, and an injection pressure of 0.4 MPa). Then, machining was performed under the conditions shown in Table 2, and the weight of the test piece before and after machining was measured, and the weight loss was determined as the cutting amount.

  The measurement results for each test piece are shown in Tables 3 to 11 and FIGS. In Tables 3 to 11, the weight loss ratio indicates the ratio to the weight loss during processing with no water supply.

  As a result of the above, even when the test piece of any material is processed, the amount of cutting can be increased compared to the case where the blasting process is performed without supplying water (comparative example). I was able to confirm.

  The increase in the amount of cutting increased as the amount of water supplied increased. However, when the amount of cutting increased to a certain extent, even if the amount of water supplied was increased, there was no further increase and leveled off.

Therefore, by injecting a relatively small amount of liquid with Ken Migakuzai not only antistatic advantages have been described above, that the processing amount of increase, it was confirmed that the unexpected effect is obtained.

  Moreover, it was confirmed that such an effect was obtained regardless of the material of the workpiece.

(2-2) Confirmation of the effect of increasing the processing amount due to the change of abrasives Using the blast nozzle shown in Fig. 5, zircon grid ("FZG 60" manufactured by Fuji Seisakusho (particle size 0.125 to 0.250mm)) The result of processing a test piece made of stainless steel by spraying and the result of processing a test piece by spraying an abrasive material made of alumina (“Fuji Random A # 60” (average particle size 230 μm) manufactured by Fuji Seisakusho Are shown in Tables 12 and 13, respectively.

  From the above results, when zircon grid (FZG-60) is used as an abrasive, an alumina abrasive ("Fuji Random A # 60" manufactured by Fuji Seisakusho (particle size 250-212 μm)) is used. In any case, an increase in the processing amount has been confirmed, and the effect of increasing the processing amount obtained in the present application is an effect that can be obtained without change even when the type of abrasive used is changed. confirmed.

  The increase in processing amount is 1.5 times or more when using zircon grid (FZG-60), and 1.3 to 1.4 times when using alumina abrasive ("Fuji Random A # 60" manufactured by Fuji Seisakusho). It was confirmed that a significant increase in the processing amount was obtained.

(3) Confirmation of the state of abrasive piercing Among the test pieces processed in “(2)” and “(2-1) Measurement of changes in processing amount with respect to changes in water supply” above, urethane rubber plates, stainless steel plates, iron plates, The component at the center of the processed part of the acrylic plate and epoxy glass plate was measured using an EDX (energy dispersive X-ray analysis) apparatus (INC Energy manufactured by Oxford) and the alumina abrasive used (Fuji Manufacturing “Fuji” The mass concentration of aluminum, which is a main component of random A # 60 "), was evaluated as the amount of abrasive piercing the test piece.

  The measurement results are shown in Tables 14 to 18 and FIGS. In Tables 14 to 18, the Al mass concentration ratio indicates the ratio to the Al mass concentration with no water supply.

  From the above results, it was confirmed that the penetration of the abrasive material was reduced by supplying the liquid compared to the case of blasting without water supply.

  In addition, even when processing by the known wet blast method, it is possible to reduce the amount of abrasive stab, but as described above, the known wet blasting method requires less cutting than dry blasting. However, it was not possible to achieve both workability and workability.

On the other hand, in the blasting process according to the present invention , as described above, the cutting amount can be improved not only in comparison with the conventional wet blasting but also in the blasting without water supply. However, at the same time, an unpredictable effect that the sticking of the abrasive can be prevented is obtained.

(4) Measurement results of abrasive consumption and particle size Processing according to the present invention using the blast nozzle shown in FIG. 2 (A) (Example) and known blast nozzle [blast nozzle of FIG. 2 (A) Using a zircon bead (FZB-60 manufactured by Fuji Seisakusho (average particle size 200 μm) as an abrasive material, using a dry blasting method (comparative example) using a structure in which the liquid introduction path 88 is omitted. A test piece made of SUS304 was blasted at an injection pressure of 0.5 MPa, the amount of abrasive material consumed after blasting was measured, and the state of the abrasive particles was observed.

  The injection is performed by a continuous injection method (abrasive circulating type blasting apparatus shown in FIG. 1), and the weight of the abrasive put into the abrasive tank of the blasting apparatus at the beginning of measurement and the recovered abrasive The weight of each was measured, and the weight of the decrease was evaluated as the consumption.

Blasting time is 45 minutes, introducing the amount of water that definitive in this onset Akira is 6cc / min.

  Table 19 shows the measurement results of the abrasive consumption and the state of the abrasive particles after use is shown in FIG.

From the above results, it was confirmed that in the blast treatment by the apparatus of the present invention, the consumption of the abrasive was reduced as compared with the known dry blasting method.

Further, from the observation results of the particle size of the recovered abrasive (see FIG. 20), as compared to the abrasive after the blasting pressure Engineering according to the present invention apparatus, the abrasive after use in dry blasting method In this case, the crushing progressed faster and the particle size became smaller. In this respect, it was confirmed that there was a big difference in the consumption of the abrasive.

(5) Measurement of surface temperature of workpiece
(5-1) Temperature measurement with thermocouple Spray distance is 100mm, spray pressure is 0.3MPa and 0.5MPa, and Zirco beads (FZB-400 made by Fuji Seisakusho: particle size <0.05mm) are used as abrasives. Then, the abrasive was sprayed onto a 15 mm × 15 mm × 0.5 mm copper plate, and the temperature change of the copper plate was measured.

  The temperature is measured by attaching a thermocouple-type thermometer to the back of the copper plate so that the temperature change can be read, and using the blast nozzle shown in FIG. The abrasive was sprayed, and the highest temperature displayed during the abrasive spray was used as the measured value. Table 20 shows the measurement results.

From the above results, according to the present onset bright, as compared with the case of processing by dry blasting method, that can significantly reduce the temperature rise of the workpiece has been confirmed.

(5-2) Confirmation of heat generation The temperature measured in the above test is a very short time of spraying for a few seconds, and the temperature at the back of the copper plate to be treated is measured. It is expected that the temperature rise on the surface side where the collision occurs is so high that the surface of the workpiece is softened instantaneously.

Therefore, in order to grasp the difference between the surface temperature of the workpiece in the treatment according to the present invention and the dry blasting method in a sensuous manner, the coating film peeling of the resin product made of PC (polycarbonate) and the PPS (polyphenylene sunfide) ) The processing state was compared by applying the blasting treatment of the present invention and the known dry blasting treatment to the deburring treatment of the resin product.

In addition, the coating film peeling of the resin product made from PC uses a blast nozzle shown in FIG. 2A to apply a high-purity alumina abrasive (“Fuji Random WA # 600” manufactured by Fuji Seisakusho) to a processing pressure of 0.4 MPa. performed by spraying with a nozzle distance 70 mm, with the amount of water supplied 5 cc / min in accordance with the present invention (example), it was processed by non-water in Comparative example.

The deburring process for PPS (polyphenylene sunfide) resin products uses nylon nozzles ("FNB -0303" manufactured by Fuji Seisakusho) with a processing pressure of 0.4 MPa using the blast nozzle shown in Fig. 2 (A). , injected with a nozzle distance 20 to 30 mm, in this onset bright (example) in the amount of water supplied 3 cc / min, it was processed in free water in the comparative example.

  FIG. 21 shows the result of measuring the surface roughness of the PC product after peeling the coating film, and FIG. 22 shows the result of measuring the surface roughness of the PPS product after deburring.

In any of the treatment results, the resin product treated with the apparatus of the present invention (see FIGS. 21A and 22A) is a resin product of a comparative example performed in a dry process [FIG. 21B and FIG. B)], the roughness of the surface is less. From this result, it is considered that the dry blasting process was greatly deformed by softening due to heat generation.

In addition, the resin product processed by dry blasting had a dark surface due to scorching, whereas the resin product processed by the device of the present invention could confirm the occurrence of such scoring. Also from this point, it was confirmed that the method of the present invention suitably prevented the heat generation of the workpiece.

Note that the occurrence of such a burn occurred not only when processing a resin product but also when processing a metal product such as aluminum, but in the processing by the apparatus of the present invention. Thus, it was possible to prevent the occurrence of scorch even in the treatment of such metal products.

Further, in the dry blasting process, the peeling of the coating film, which took 11 to 12 seconds, was shortened to 6 to 7 seconds in the treatment by the apparatus of the present invention. When the blasting process of the present invention is performed, the coating film is removed. It was confirmed that an improvement in efficiency was obtained.

  In addition, the same effect was confirmed not only for the resin as the base material but also for the paint removal of the metal surface such as aluminum alloy, magnesium alloy, zinc alloy, brass alloy, iron, etc.

  In the deburring process, even burrs that could not be removed by dry blasting can be removed by the blasting process of the present invention, and the blasting process of the present invention is also effective when used for the deburring process. It was confirmed that.

The difference is that in dry blasting, the surface temperature of the workpiece rises, and the coating film and burrs soften to absorb the impact when the abrasive material collides, making peeling and removal difficult. On the other hand, in the treatment according to the present invention, the surface of the workpiece is cooled, so that the softening of the coating film and burrs is suppressed, and the coating film and burrs are kept hard (and therefore brittle). It is thought that this is because peeling and removal are easily performed due to the collision.

(6) Checking the state of warpage Using the blast nozzle shown in Fig. 2 (A), Zircon shot (FZB-425 manufactured by Fuji Seisakusho (0.425 to 0.60 mm average particle size 513 µm)) as the abrasive. Used to process an almen strip (A strip).

  The processing pressure is 0.3MPa and 0.5MPa, the processing time is 20 seconds, the water supply amount is changed, and the arc height value (curved height of the test piece) is measured. evaluated. Table 21 shows the measurement results.

As a result, it has been confirmed that when the blast processing is performed by the apparatus of the present invention, the warpage generated on the workpiece can be slightly reduced.

1 Blasting device 2 Cabinet 21 Processing room 3 Abrasive material tank (cyclone)
DESCRIPTION OF SYMBOLS 5 Dust collector 6 Ventilator 7 Flow control valve 8 Blast nozzle 81 Body 82 Nozzle tip 82a Cone inner surface 83 Jet 84 Abrasive material introduction port 85 Abrasive material introduction chamber 86 Compressed gas flow path 88 Liquid introduction path 88a Tip (of liquid introduction path)
91 Abrasive recovery pipe

Claims (2)

In a blasting apparatus for injecting a compressed gas flow supplied from a compressed gas supply source from a blast nozzle as a mixed fluid with an abrasive,
The blast nozzle has a nozzle tip in a jet direction of a jet communicating with a compressed gas supply source, and has an abrasive introduction chamber communicating with an abrasive supply source between the jet and the nozzle tip, and a compressed gas flow from the jet A suction type blast nozzle that generates a negative pressure in the abrasive introduction chamber by jetting and sucks the abrasive from the abrasive supply source and jets it as a mixed fluid;
To the blast nozzle, together with the forms and can communicate at one end to the liquid supply source, the flow path of the compressed gas in the blast nozzle at the other end, or open at the injection port of the blast nozzle, is introduced from the liquid supply source A liquid introduction path for causing the liquid to collide with a compressed gas flow flowing in the blast nozzle or a compressed gas flow injected from the blast nozzle to atomize the liquid,
Between the liquid supply source and the liquid introduction passage, Rutotomoni comprises a flow control means,
The liquid introduction path is formed by a pipe line concentrically inserted in the compressed gas flow path provided in the jet, and the other end of the liquid introduction path is opened at the jet outlet of the jet. Blasting device characterized by Wherein the liquid in the liquid supply source, the blasting machine according to claim 1, characterized in that a liquid dispensing means quantitatively supplying to said liquid introduction path.