JP2004230535A - Wet blasting device and work machining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet blasting device adopting a new structure wherein slurry stored in a tank is extruded out, and to provide a precise work machining technology using the extruding type wet blasting device. <P>SOLUTION: The wet blasting device injects the slurry 1 made by mixing abrasive grains with liquid, to work 5 with compressed air. The tank 2 storing the slurry 1 is provided, and pressuring gas is introduced into the tank 2, thereby extruding the slurry 1 to the outside of the tank 2. The extruded slurry 1 is injected to the work 5 with the compressed air. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wet blast device and a work processing method.
[0002]
Problems to be solved by the prior art and the invention
Various wet blasting apparatuses have been proposed in which a slurry in which abrasive grains are mixed with a liquid is sprayed onto a work together with compressed air to perform processing.
[0003]
For example, as disclosed in Japanese Patent No. 3356415 according to the earlier application of the present applicant, the wet blast device introduces a slurry into a nozzle using a pump, and the slurry introduced into the nozzle is compressed together with compressed air. A circulation type is adopted in which the slurry is sprayed onto the work, the sprayed slurry is collected, and the collected slurry is again introduced into the nozzle using the pump.
[0004]
The present invention provides a wet blasting device that employs an unprecedented configuration in which slurry stored in a tank is extruded, and also provides a high-precision work processing technology using the extrusion-type wet blasting device. It is.
[0005]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0006]
A wet blasting device for injecting a slurry 1 in which abrasive grains are mixed with a liquid together with compressed air onto a work 5, wherein a tank 2 for storing the slurry 1 is provided. The wet blasting apparatus according to the present invention is characterized in that the slurry 1 is pushed out of the tank 2 by pressurizing the inside of the tank 2 and the pushed slurry 1 is jetted to the work 5 together with the compressed air. Things.
[0007]
Further, in the wet blast device according to the first aspect, the present invention relates to a wet blast device, wherein compressed air is employed as a pressurizing gas.
[0008]
Further, in the wet blasting apparatus according to any one of claims 1 and 2, the tank 2 is provided with a maintenance mechanism 4 for maintaining the liquid in the slurry 1 and the abrasive grains at a predetermined ratio. The present invention relates to a wet blasting apparatus.
[0009]
According to a third aspect of the present invention, there is provided the wet blast apparatus, wherein a stirrer for stirring the slurry 1 in the tank 2 is employed as the maintenance mechanism 4.
[0010]
The wet blast device according to any one of claims 1 to 4, wherein the mass flow rate control mechanism 7 is provided in the passage 21 of the compressed air. .
[0011]
Further, in the wet blast device according to the fifth aspect, the mass flow rate control mechanism 7 is provided in a portion before the compressed air is mixed with the slurry 1 as a passage 21 for the compressed air. It relates to a wet blast device.
[0012]
Further, in the wet blast device according to any one of claims 5 and 6, the mass flow rate control mechanism 7 is not provided in the passage 16 of the slurry 1, but is provided only in the passage 21 of the compressed air. The present invention relates to a wet blasting device.
[0013]
Further, a predetermined amount of the slurry 1 is stored in the tank 2 by using the wet blasting device according to any one of claims 1 to 7, and a pressurizing gas is introduced into the tank 2 to squeeze the inside of the tank 2. The present invention relates to a method of processing a workpiece, wherein the slurry 1 is ejected together with compressed air while the slurry 1 is being pushed out of the tank 2 by pressurizing, and the workpiece 5 is treated with the slurry 1 having a predetermined amount or less. .
[0014]
In addition, this is a work processing method in which a slurry 1 in which abrasive grains are mixed in a liquid is sprayed onto a work 5 together with compressed air, wherein a pressurizing gas is introduced into a tank 2 for storing the slurry 1 and the inside of the tank 2 is pressurized. The method according to the present invention relates to a work processing method characterized in that the slurry 1 is pushed out of the tank 2 by pressing, and the pushed slurry 1 is jetted to the work 5 together with the compressed air.
[0015]
According to a ninth aspect of the present invention, there is provided the workpiece processing method according to the ninth aspect, wherein the slurry 1 sprayed on the workpiece 5 is not introduced into the tank 2.
[0016]
Function and effect of the present invention
Since the inside of the tank 2 is pressurized by introducing a pressurizing gas into the tank 2 and the slurry 1 is pushed out of the tank 2 by this pressurization, there is a limit in a type in which the slurry 1 is pushed out by a pump. It is possible to derive the slurry 1 at high pressure and high speed. Specifically, the gas can be pressurized to a higher pressure than the slurry 1, and if a high-pressure pressurizing gas is introduced into the tank 2, the slurry 1 can be discharged at a high pressure and at a high speed.
[0017]
Further, the pressure adjustment when the slurry 1 is drawn out (extruded) out of the tank 2 can be easily achieved. Specifically, if a pressurizing gas of a desired pressure is introduced into the tank 2, the slurry 1 can be derived at the desired pressure. Further, a decrease in the pressure in the tank 2 due to the discharge of the slurry 1 can be easily prevented by replenishing the tank 2 with a pressurizing gas, whereby the slurry 1 can be easily kept at a constant pressure. Can be derived.
[0018]
In addition, in the configuration in which the slurry 1 in the tank 2 is led out by the pump, pulsation is inevitably generated due to the structure of the pump, but according to the configuration of the present invention, such pulsation is not generated.
[0019]
Since the present invention is configured as described above, it is an epoch-making wet blasting technology that enables high-pressure, high-speed processing and high-precision processing that were difficult with a conventional wet blasting apparatus.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 illustrate a first embodiment of the present invention, and FIGS. 3 and 4 illustrate a second embodiment, which will be described below.
[0021]
The first embodiment is a wet blasting apparatus for injecting a slurry 1 in which abrasive grains are mixed into a liquid together with compressed air onto a work 5, wherein a tank 2 for storing the slurry 1 is provided. The slurry 1 is pushed out of the tank 2 by introducing gas and pressurizing the inside of the tank 2, and the pushed slurry 1 is ejected from the nozzle 6 together with the compressed air.
[0022]
The liquid and abrasive grains are appropriately selected depending on the work 5 and the processing performed on the work 5. For example, water or a degreasing solution is used as a liquid, and glass abrasives or alumina abrasives are used as abrasives.
[0023]
The slurry 1 is configured such that only the amount stored in the tank 2 is sprayed without being recycled after being sprayed from the nozzle 6 as in a conventional wet blast device. The slurry 1 ejected from the nozzle 6 together with the compressed air is collected by the collection unit 10.
[0024]
The tank 2 is provided with a maintenance mechanism 4 for maintaining the liquid and the abrasive grains in the slurry 1 at a predetermined ratio, specifically, a stirring device for stirring the slurry 1 in the tank 2.
[0025]
In the figure, reference numeral 11 denotes a stirring blade for stirring the slurry 1 in the tank 2, and reference numeral 12 denotes a drive motor for rotating the stirring blade 11. The rotation of the stirring blade 11 prevents the abrasive grains in the slurry 1 from settling in the tank 2, whereby the slurry 1 in the tank 2 has a predetermined ratio of liquid and abrasive grains in any part.
[0026]
Further, a slurry lead-out path 16 for introducing the slurry 1 in the tank 2 to the nozzle 6 is connected to the tank 2. An opening / closing valve 17 is provided in the slurry outlet path 16.
[0027]
A slurry hopper 13 for introducing the slurry 1 into the tank 2 is connected to the tank 2 via a slurry path 14. An on-off valve 15 is provided in the slurry path 14.
[0028]
The tank 2 is provided with a gas path 18 for introducing the pressurizing gas into the tank 2. An open / close valve 19 is provided in the gas path 18.
[0029]
The gas path 18 branches off from a compressed air path 20 for introducing compressed air into the nozzle 6.
[0030]
Specifically, the compressed air path 20 is branched into a gas path 18 connected to the tank 2 and a compressed air supply path 21 connected to the nozzle 6. The gas path 18 and the compressed air supply path 21 are provided with adjusting sections 22 and 23 capable of adjusting the flow rate and the flow pressure, respectively, and are introduced into the tank 2 by the settings of the adjusting sections 22 and 23. The amount and pressure of the pressurizing gas (compressed air) and the amount and pressure of the compressed air introduced into the nozzle 6 are respectively adjusted.
[0031]
By adjusting the adjusting unit 22 of the gas path 18, it is possible to adjust the amount and pressure of the slurry 1 that is drawn from the tank 2. This adjustment may be performed before the work 5 is processed, for example, by storing water in the tank 2 and performing a trial operation using the water.
[0032]
An on-off valve 24 is provided in the compressed air supply path 21.
[0033]
In the drawing, reference numeral 25 denotes a check valve, 26 denotes an air supply device, 27 denotes an air flow meter for measuring the flow rate of compressed air passing through the compressed air path 20, and 28 denotes a work fixing portion.
[0034]
As the nozzle 6, a nozzle that appropriately mixes the slurry 1 extruded from the tank 2 and the compressed air that has passed through the compressed air supply path 21 and ejects the slurry 1 is used.
[0035]
Each of the above-described components is preferably provided inside one case body 29 as much as possible in consideration of achieving compactness, mobility, and the like.
[0036]
The wet blasting device of the first embodiment exhibits the following functions and effects.
[0037]
{Circle around (1)} Since a pump for introducing the slurry 1 into the nozzle 6 is unnecessary, the size of the apparatus can be reduced. When the size is reduced, for example, it becomes suitable as an experimental device or a test device (a test device for evaluating a film or abrasion resistance) used in a laboratory.
[0038]
{Circle around (2)} When the pressurizing gas (compressed air) introduced into the tank 2 is set to a high pressure, the slurry 1 in the tank 2 can be pushed to the nozzle 6 at a high pressure, and high-speed processing using the high-pressure slurry 1 (High-speed processing) becomes possible.
[0039]
{Circle around (3)} The amount and pressure at which the slurry 1 is introduced into the nozzle 6 can be easily adjusted and controlled by the amount and pressure of the pressurizing gas introduced into the tank 2, thereby simplifying desired processing and processing. Can be done.
[0040]
{Circle over (4)} Since there is no pump in the path for introducing the slurry 1 to the nozzle 6, pulsation that is necessarily generated by the pump does not occur.
[0041]
(5) It is easy to grasp (manage) the amount of the slurry 1 injected to the work 5. Specifically, by comparing the amount of the slurry 1 previously introduced into the tank 2 with the amount of the slurry 1 in the tank 2 after processing, the amount of the slurry 1 injected to the work 5 can be easily grasped. it can. When the amount and pressure of the pressurizing gas introduced into the tank 2 are controlled, the amount and the pressure of the pressurizing gas and the amount and the pressure of the slurry 1 pushed out of the tank 2 have a proportional relationship. The injection amount of the slurry 1 per hit can also be easily grasped.
[0042]
{Circle around (6)} Since only the slurry 1 stored in the tank 2 is jetted to the work 5, it is possible to reliably prevent the worn abrasive grains, which may be a problem in the circulation system, from being jetted to the work 5. More specifically, if the fresh slurry 1 is stored in the tank 2, only the fresh slurry 1 is jetted to the work 5, so that the processing and processing of the work 5 are achieved in a desired stable state.
[0043]
That is, the first embodiment is an extremely innovative wet blasting apparatus capable of performing high-precision wet blasting and high-speed wet blasting.
[0044]
In particular, since high-precision wet blasting is possible, it becomes extremely suitable as an experimental device or a test device, and high-precision experimental data can be obtained.
[0045]
In addition, the processing can be completed in a short time by performing the processing at a high speed even for the super-hard work 5.
[0046]
In addition, since there is no pump for circulating the slurry 1, energy saving (power saving) is achieved accordingly.
[0047]
Further, although not configured to circulate the slurry 1, it is also possible to inject the slurry 1 having a storage capacity of the tank 2 or more to the work 5 together with the compressed air. Specifically, when the slurry 1 stored in the tank 2 is exhausted, only the compressed air is led out from the tank 2, and the work 5 is not processed at all in this state. In this state, if the slurry 1 is introduced into the tank 2 from the slurry hopper 13, the slurry 1 introduced into the tank 2 will be jetted onto the work 5. The processing to be used becomes possible.
[0048]
In this case, after the slurry 1 previously stored in the tank 2 is exhausted, each of the on-off valves is closed to prevent the slurry 1 from being introduced into the nozzle 6, and the slurry 1 is stored in the tank 2. Then, each closed valve is opened to start the process. Since the processing amount (processing amount) of the work 5 is mainly determined by the amount of the slurry 1, even if the processing is intermittent, there is almost no influence on the test results and the like.
[0049]
The second embodiment is different from the first embodiment in that a mass flow rate control mechanism 7 is provided in a compressed air supply path 21 for introducing compressed air to the nozzle 6.
[0050]
In the first embodiment, the introduction of the slurry 1 into the nozzle 6 is improved to achieve high-precision and high-speed wet blasting. By improving the air introduction structure, a more accurate wet blast treatment has been achieved.
[0051]
The mass flow rate control mechanism 7 is known in the industry as a device capable of achieving high precision flow rate control.
[0052]
FIG. 4 illustrates the mass flow rate control mechanism 7, in which a sensor 31 for monitoring a fluid flow rate (a so-called high-precision mass flow sensor is employed) and a valve 32 (fine-adjustable electromagnetic sensor) are used. And a control unit 33 for digitally controlling the opening / closing degree of the valve 32 based on the flow rate of the fluid sensed by the sensor 31.
[0053]
This mass flow control mechanism 7 is provided only in the compressed air supply path 21 and is not provided in other paths through which compressed air passes or through which the slurry 1 passes.
[0054]
According to experiments repeated by the applicant, even if the mass flow rate control mechanism 7 is provided in the path through which the slurry 1 passes, the processing amount and processing accuracy of the work 5 hardly change, and the mass flow rate control mechanism is provided in the compressed air supply path 21. 7, it has been confirmed that the injection amount of the slurry 1 and the compressed air is stable and the processing amount and the processing accuracy are extremely high (the processing accuracy is five times as large). Further, there is almost no effect between the case where the mass flow rate control mechanism 7 is provided only in the compressed air supply path 21 and the case where the mass flow rate control mechanism 7 is provided in both the compressed air supply path 21 and the path through which the slurry 1 passes. It has been confirmed that there is no difference in (processing amount and processing accuracy). Therefore, from the viewpoint of achieving high-accuracy processing and the viewpoint of cost reduction, the second embodiment employs a configuration in which the mass flow rate control mechanism 7 is provided only in the compressed air supply path 21. .
[0055]
The reason why the mass flow rate control mechanism 7 is provided only in the compressed air supply path 21 to increase the processing amount and the processing accuracy is that the nozzle 6 has a suction effect by the negative pressure when the compressed air passes through the nozzle 6, that is, The slurry 1 and the compressed air are mixed by the suction effect of the pressure balance. At this time, when the flow rate and the flow pressure of the compressed air are stabilized, the pressure balance is naturally stabilized, whereby the slurry 1 It is supposed that the compressed air and the compressed air enter a mixed state in which the processing capacity can be stably exhibited at a high level, and thus the throughput and the processing accuracy are increased.
[0056]
As described above, the second embodiment is an extremely epoch-making wet blast apparatus capable of performing the wet blast processing on the workpiece 5 with higher accuracy than the first embodiment.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing a first embodiment.
FIG. 2 is an explanatory diagram of the first embodiment.
FIG. 3 is an explanatory view schematically showing a second embodiment.
FIG. 4 is an explanatory diagram of a mass flow rate control mechanism 7 according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slurry 2 Tank 4 Maintenance device 5 Work 7 Mass flow rate control mechanism 16 Passage path 21 Passage path

Claims (10)

A wet blast device for injecting a slurry in which abrasive grains are mixed into a liquid together with compressed air onto a work, wherein a tank for storing the slurry is provided, and a pressurizing gas is introduced into the tank to pressurize the tank. Thus, the slurry is pushed out of the tank, and the pushed slurry is sprayed onto the work together with the compressed air. The wet blasting device according to claim 1, wherein compressed air is used as the pressurizing gas. The wet blasting apparatus according to any one of claims 1 and 2, wherein the tank is provided with a maintenance mechanism for maintaining a predetermined ratio between the liquid in the slurry and the abrasive grains. . 4. The wet blasting device according to claim 3, wherein a stirrer for stirring the slurry in the tank is employed as the maintenance mechanism. The wet blast device according to any one of claims 1 to 4, wherein a mass flow rate control mechanism is provided in a passage of the compressed air. 6. The wet blast device according to claim 5, wherein the mass flow rate control mechanism is provided in a portion of the passage of the compressed air before the compressed air is mixed with the slurry. The wet blast device according to any one of claims 5 and 6, wherein the mass flow rate control mechanism is not provided in the passage of the slurry 1, but is provided only in the passage of the compressed air. Wet blasting equipment. A predetermined amount of slurry is stored in a tank using the wet blasting device according to any one of claims 1 to 7, and a pressurizing gas is introduced into the tank to pressurize the inside of the tank. And discharging the slurry together with the compressed air while extruding the slurry out of the tank to treat the workpiece with the slurry having the predetermined amount or less. A work processing method for injecting a slurry in which abrasive grains are mixed into a liquid together with compressed air onto a work, wherein a pressurizing gas is introduced into a tank storing the slurry, and the slurry is pressurized in the tank to form a tank. A method of processing a workpiece, wherein the slurry is extruded to the outside and the extruded slurry is sprayed onto the workpiece together with the compressed air. The method according to claim 9, wherein the slurry sprayed on the work is not introduced into the tank.

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