JP2001009728A - Ice slurry surface working method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To work a surface without damaging a soft workpiece by turning supercooled water below a freezing point into supercooled ice grains obtained by a condition change by a vortex flowing water releasing means, and injecting ice slurry obtained by mixing the ice grains and cooling water at a prescribed ratio into the workpiece. SOLUTION: Supercooled water cooled below a freezing point by a supercooling part 12 of an supercooled water manufacturing part 10 falls on and collides with a crystallization plate 15 from a conduit 11a to instantly freeze as ice grains 29 to be successively supplied to an ice slurry storage tank 16. The ice grains 29 are mixed with chilled water 27 supplied from a cooling water supply device 20, cooling water is supplied so as to become the prescribed slurry concentration while turning on and off a solenoid valve 34 on the basis of a signal from a monitor 32 to be agitated and mixed by an agitating blade 18, and iced slurry 26 of the prescribed concentration is stored in the slurry storage tank 16. The ice slurry 26 is sent to an injection nozzle 22 from a carrying passage 19 to be accelerated by compressed gas supplied from a compressed gas supply pipe 36 to be injected toward a workpiece surface from the injection nozzle 22 to work the workpiece surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid honing or liquid blasting apparatus (hereinafter referred to as ice slurry surface processing) using an ice slurry for spraying slurryed ice particles with a high-pressure fluid and performing machining such as fine processing or surface polishing. Device)
In particular, ice for conducting honing or blasting (surface processing) by guiding an ice slurry to a surface processing section via a transport path, and injecting the ice slurry to a workpiece through a jetting means in the surface processing section. The present invention relates to a slurry surface processing device.

[0002]

2. Description of the Related Art Conventionally, a liquid blast or a liquid blast, in which a suspension of abrasive grains or granular members in a liquid is accelerated to a high speed by using fluid pressure and sprayed onto a metal surface or other workpiece surface. Liquid honing (hereinafter referred to as liquid honing) is known. Such liquid honing is performed by using grinding abrasives, glass beads, vegetable particles, or synthetic resin particles as a blasting material, and then using a burr after machining. It is used for a wide range of processing such as deburring of molded products, fine processing and surface grinding. However, in the prior art, there is a risk that the blast material may remain on the surface of the workpiece, change in dimensions due to blasting, or damage the processing surface. For this reason, it is a situation in which a great deal of cost and wasteful time is wasted particularly in the removal of the residue in these post-treatments.

As one means for solving the above-mentioned problems, various ice blasting methods have been proposed in which ice particles or dry ice particles are used and jetted with high-pressure gas. For example, JP-A-58
Japanese Patent Application Publication No. 10-26774 discloses a technique in which only ice particles are sprayed onto a surface to be processed using an ejector.
Discloses a technique for injecting frozen particles in a low-temperature atmosphere using refrigerant evaporating gas, and WO86 / 04536 discloses an ice blasting technique using dry ice particles.

[0004] However, all of the above-mentioned methods have a structure in which only ice particles or dry ice particles are jetted together with an air flow, and thus cannot be accompanied by a washing function. The problem of re-attachment of members, the problem of ice particles sprayed to accumulate and freeze on the surface of the workpiece, and the fact that ice particles and dry ice, which are the blast material, cause clogging in the transport process to the blast site, resulting in a stable condition. There is a problem that the operation of the injection nozzle is not guaranteed.

In order to solve the above problem, Japanese Patent Application Laid-Open No. Hei 8-309660 discloses a liquid honing (blast) technique using ice slurry. That is,
The above proposal is similar to the above-mentioned ice blast method in that the conventional liquid honing uses ice as a blasting material in order to prevent damage to the surface to be processed. Processing similar to liquid honing is performed using an ice slurry in which water is mixed with the ice particles so that post-washing is not required. That is, in the prior art, as shown in FIG. 6, a stirring and mixing device 55 for supplying ice particles 50 and cooling water 52 cooled in a storage tank 53, and an ice slurry 51 mixed by the stirring and mixing device 55 are used. The high pressure gas is introduced to the high pressure injection nozzle 22 by the pump 54 and accelerated by the high pressure gas 58 to perform blasting.

In the prior art, an ice block supply device (not shown) and a supplied ice block are crushed to form an ice block 5 having a predetermined particle size.
A suitable amount of ice particles having a required particle size is prepared by an ice particle producing section 57 provided for producing the water, and a cooling water of an appropriate temperature is supplied from a fresh water supply section 17 to a liquid storage tank 53 by a unit cooler 56 attached thereto. After preparing 52, the ice particles 50 and the cooling water 52 prepared above are supplied to the stirring and mixing tank 55 from the ice particle producing section 57 and the liquid storage tank 53, respectively, so that the ice slurry having an appropriate concentration is stirred. Formed by mixing,
The slurry is conveyed to the high-pressure jet nozzle 22 via the pump 54 and the slurry is jetted from the nozzle 22 to perform surface processing. In addition,
Into the liquid storage tank 53, the injection drainage is collected from the drainage tank 22a of the liquid honing unit 21 through the drainage pump 22b and the filter 22c, and fresh water is replenished from the fresh water supply unit 17 and the predetermined water level is supplied through the ball tap 17a. To keep it.

[0007]

However, the above prior art also has the following problems. In other words, the conventional technique requires an ice block supply unit and an ice particle production unit for crushing the apparatus and producing ice particles having a predetermined particle size, which causes a problem that equipment cost is increased. In addition, in an ice particle production section configured to mechanically crush ice blocks, it is difficult to obtain ice particles having a constant particle size from the ice blocks, and there is a problem that blasting ability becomes unstable. Furthermore, in the above prior art, in order to obtain ice slurry of an appropriate concentration by mixing crushed ice particles and water cooled by a cooling unit, it is necessary to install a stirring and mixing tank,
Even with such equipment, since the crushed ice and the cooling water cooled by the chiller are separately supplied and stirred, the concentration of the ice slurry tends to be unstable.

The present invention has been made in order to solve the above-mentioned problem, and when an ice slurry in which ice particles are mixed with water is sprayed onto a workpiece to perform processing similar to liquid honing or liquid blasting, a uniform particle size is obtained. The use of ice slurry with a stable concentration of ice particles and a constant volume of ice particles ejected ensures stable blasting capacity and is compact without the need for a separate stirring mixer. An object of the present invention is to provide a low-cost ice slurry surface processing method and an apparatus therefor. It is another object of the present invention to provide an ice slurry surface processing method and apparatus capable of performing surface processing without damaging a soft workpiece that is easily damaged.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an ice slurry in which ice slurry in which ice particles are mixed with water is sprayed onto a workpiece to perform processing similar to liquid honing or liquid blasting. In the surface processing method, the ice particles are supercooled ice particles obtained by changing the state of supercooled water having a temperature below the freezing point by vortex water releasing means, and the ice particles are obtained by mixing the ice particles and cooling water at a predetermined ratio. It is characterized by injecting ice slurry onto the workpiece. In this case, the temperature of the supercooled water is approximately-
By setting the temperature to 2 to 0 ° C., the particle size of the ice
It is preferable because a uniform product having a thickness of 2 mm to 2 mm, preferably 0.1 mm to 1 mm can be produced.

According to this invention, ice particles having a uniform particle size can be formed by a state change such as collision or agitation called supercooling rather than mechanical crushing. By using an ice slurry with a stable concentration formed by, and stabilizing the blasting capacity, without the need for the installation of a separate stirring mixer,
A compact and low-cost ice slurry surface processing apparatus can be obtained. That is, the present invention relates to an ice slurry surface processing apparatus which performs the same processing as liquid honing or liquid blasting by injecting an ice slurry in which ice particles are mixed with water into an object to be processed through an injection means, and using the same. An apparatus for producing cooling water, and supercooling water releasing means for obtaining supercooled ice particles by changing the state of the supercooling water, wherein the supercooling water releasing means mixes ice particles and cooling water to form ice. It is characterized by being located on a slurry storage tank.

In this case, the supercooling water releasing means is constituted by a collision plate for producing ice particles by collision of the supercooling water having gravitational energy, preferably an inclined plate made of a heat insulating or low friction material. Alternatively, the supercooled water releasing means may be constituted by an underwater releasing section for producing ice particles by colliding the supercooled water with solid particles or air bubbles. The supercooled water releasing means is constituted by an inclined plate made of a heat-insulating or low-friction material, so that the generated ice particles fall smoothly into the ice slurry storage tank without being fixed to the inclined plate. .

Further, according to the present invention, the means for adjusting the mixing ratio (ice slurry concentration) between the ice particles of the ice slurry and the cooling water sprayed on the workpiece is provided on the slurry transport path between the ice slurry storage tank and the spraying means. And wherein the cooling water is cooling water near the freezing point introduced from the bottom of the ice slurry storage tank. According to this invention, the concentration of the ice slurry for surface processing can be adjusted with high accuracy, and the cooling water for the adjustment is a cooling water close to the freezing point introduced from the bottom of the ice slurry storage tank, so that independent cooling water is used. No storage tank is required, and the ice particles do not melt.

[0013] If monitoring means for monitoring the concentration of the ice slurry sprayed on the workpiece is located on the path circulating in the ice slurry storage tank, the slurry concentration in the ice slurry storage tank is made constant. This eliminates the need for the adjusting means.
Also, the present invention provides an ice slurry manufactured by the ice slurry manufacturing section,
An ice slurry surface processing apparatus which guides a surface to a surface processing section via an ice slurry transport path and injects a workpiece through an injection means operated by a high-pressure fluid in the surface processing section to perform surface processing, The unit is a supercooled water producing unit that forms ice particles by releasing the supercooled water from the supercooled water, and an ice slurry storage tank that receives the formed ice particles and forms an ice slurry by stirring and mixing with the stored cold water, It is characterized by comprising an ice slurry concentration adjusting section provided at a preceding stage of a transport path for guiding the ice slurry to the injection means.

According to this invention, in addition to the effects of the above-mentioned invention, since the state of supercooled water is changed to frozen ice from the supercooled water by the ice crystallizing plate or the underwater canceller in the external air, The size and the supply amount of ice particles are stabilized, and the concentration of the ice slurry can be controlled in a stable state by constantly controlling the amount of cold water in the ice slurry storage tank to a predetermined amount. By controlling the temperature and the flow rate of the supercooled water, it is possible to obtain a blasting ice slurry having a stable blasting ability capable of appropriately controlling the size and discharge amount of ice particles. Further, the supercooled water producing unit includes a cooler that forms supercooled water from chilled water, and a supercooled water canceling unit that cancels supercooled water, and it is preferable to provide a chilled water temperature adjusting unit at a stage preceding the cooler. .

The supercooling water releasing means is constituted by a collision plate for producing ice particles by collision of supercooling water having gravitational energy, preferably an inclined plate having a heat insulating or low friction material. As described above, the supercooled water releasing means may be constituted by an underwater releasing unit for producing ice particles by colliding the supercooled water with solid particles or air bubble particles. According to the above configuration, in the supercooled water production section, the cold water stored in the ice slurry storage tank is introduced into the brine cooler of the supercooled water production section, and preferably approximately -1.
It is supercooled without freezing to about -2 ° C. The supercooled water is introduced into the upper part of the ice slurry storage tank, and the supercooled state is released due to the impact of the collision with the ice crystallizing plate or the state change by the underwater release device, which freezes and becomes ice particles and enters the ice slurry storage tank. In the ice slurry storage tank that has fallen, the frozen ice particles that have fallen and the cold water are mixed to form an ice slurry.

A chilled water temperature control section is provided in a chilled water supply path to the brine cooler so that the chilled water is prevented from freezing in the brine cooler. By using the brine cooler, the temperature can be adjusted in response to the load fluctuation, and the size of the ice particles can be appropriately controlled. Note that a direct expansion type cooler may be used as the cooler. Further, as described above, it is preferable that the concentration adjusting section be configured to supply an appropriate amount of cold water of the ice slurry storage tank to the high-concentration ice slurry from the ice slurry storage tank and adjust the concentration in the front stage of the transport path. is there.

According to the above-mentioned structure, in the ice slurry storage tank, a high-concentration ice slurry which is stirred and stabilized is transferred to a substantially constant 0.degree. Because near cold water is supplied as required, conventional water is cooled with a chiller at 0 ° C.
Compared to the case where the above water is separately supplied and agitated, high-concentration ice slurry is kept in a stable state in the ice slurry storage tank,
When lowering the concentration, cold water near 0 ° C. is replenished to enable stable adjustment. The ice slurry storage tank is provided with a circulation path for collecting and recirculating waste water from the jetting means of the surface processing section and using it as cold water.

According to the above construction, the drainage of the ice slurry which is conveyed in the conveying path and jetted from the jetting means of the honing section as the jetting material is transferred from the drainage recovery tank provided at the lower part of the honing section to the supernatant liquid excluding the precipitate. It is designed to be recycled back to the ice slurry storage tank via the filter. The transfer path is constituted by a double pipe transfer path connecting the ice slurry storage tank and the injection means, and the inner pipe of the double pipe is used to transfer the ice slurry to the injection means by gravity head or pressure feed, and to the outer pipe. Is characterized in that it has a forward / reverse transport path structure in which the drainage of the injection means is sent to the outside of the inner pipe and fed backward. According to this invention, since the drainage of the injection means close to 0 ° C. is bent outside the ice slurry conduction path, it is possible to carry the predetermined slurry concentration without melting the ice particles.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative positions, and the like of the structural components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified. It is only an example. An embodiment of a liquid honing apparatus using an ice slurry according to a first embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 10 denotes a supercooling water producing unit, which comprises a supercooling unit (air cooling condensing unit) 12 for cooling water to a supercooled state, and a supercooling water 3 of about −2 ° C. produced by the supercooling unit 12. From the conduit 11a
5 and collide with it to crystallize ice particles 29 of 0.1 mm to 2 mm, preferably 0.1 mm to 1 mm.

The ice crystallizing plate 15 (ice making plate) is formed of an inclined plate obtained by coating a surface of a heat insulating plate with a fluororesin, and the inclined plate is located above a slurry storage tank 16.
The ice particles 29 crystallized by the crystallizing plate are guided to the ice slurry storage tank 16. The supercooled water is below freezing point (about -1 to -2).
℃) water that is not frozen and has a liquid phase that is maintained in a metastable state where no state change occurs, but has the property of freezing instantly when any impact is given . On the other hand, above the ice slurry storage tank 16 located immediately below the ice crystallizing plate 15 (ice making plate), the low-temperature cold water 2 near 0 ° C.
7 is provided, and the amount of cold water 27 supplied from the cooling water supply device 20 to the ice slurry storage tank 16 is controlled by an electromagnetic valve 34 that is turned on and off based on a signal from a monitor 32. It is being adjusted. Further, a stirring blade 18 driven by a motor 18a is built in the ice slurry storage tank 16,
The ice particles 29 crystallized by the ice particle crystallization plate 15 and the cooling water supplied from the cooling water supply device 20 via the electromagnetic valve 34 are stirred to produce an ice slurry having a uniform slurry concentration. .

In the drawing, reference numeral 32 denotes a slurry monitor, which is connected to the ice slurry storage tank 16 via a slurry pump 33 via a circulation path 35 so as to constantly detect the ice slurry concentration. The ice slurry concentration was measured using the slurry monitor 3.
2 of the cooling water supply device 20 based on the detection result of
Is appropriately opened and closed, and the amount of cooling water flowing into the ice slurry storage tank 16 is adjusted to maintain the concentration set value required for blasting. In the drawing, reference numeral 22 denotes an injection nozzle (blast gun). The ice slurry 26 is pressure-fed from the ice slurry storage tank 16 by the ice slurry transport path 19 via a slurry pump 19a, and compressed by a compressed gas supply pipe 36. Ice slurry is sprayed by gas. Usually, air is used as the compressed gas. The ice slurry may be ejected at a high speed from the ejection nozzle by the pressure of the slurry pump 19a without using the compressed gas (air).

Therefore, according to the present embodiment, the supercooled water cooled to below the freezing point (about -2 ° C. in the present embodiment) in the supercooling section 12 of the supercooled water producing section 10 is crystallized from the conduit 11a. The plate 15 is caused to fall and collide with the plate 15, and is instantaneously frozen by the impact to form ice particles 29, which are sequentially supplied to the ice slurry storage tank 16. The ice particles 29 have a stable IPF (ice making ratio) of about 60%, and have a particle size of 0.1 m.
m to 2 mm, preferably about 0.1 mm to 1 mm. The ice particles 29 supplied to the ice slurry storage tank 16 by using the inclined surface of the crystallization plate 15 are mixed with the temperature-controlled cold water 27 supplied from the cooling water supply device 20, and the cooling water is Based on the signal from the monitor 32, the cooling water is supplied so as to have a predetermined slurry concentration while turning on and off the electromagnetic valve 34, and further, the stirring blade 18
Ice slurry of a predetermined concentration mixed with stirring
6 is stored in the slurry storage tank 16.

Then, the slurry is sent to the injection nozzle (blast gun) 22 from the transport path 19 and is supplied to the compressed gas supply pipe 3.
It is accelerated by the compressed gas sent from 6 and sprayed from the blast gun 22 toward the surface of the workpiece to be used for surface processing of the workpiece. Therefore, in this embodiment,
Ice particles used for ice slurry have a particle size of 0.1 mm to 2 mm.
mm, preferably about 0.1 mm to 1 mm, which is rich in uniformity. In a conventional liquid honing device using an ice slurry, even if the surface of the workpiece is damaged, the blasting operation can be performed without any problem. It can improve the quality and is very useful for operations such as deburring and cleaning precision parts. In addition, instead of slicing solid block ice with an ice machine as in conventional equipment, ice particles are made directly from supercooled water, so the energy efficiency required for ice making is dramatically higher, and energy saving is achieved. It is extremely excellent from a viewpoint.

FIG. 2 is a view showing a schematic configuration of another embodiment of the ice slurry surface processing apparatus of the present invention, and FIG. 3 is a view showing a preferred form of the ice slurry transport path of FIG. FIG.
The same reference numerals are used for parts having the same functions as the constituent parts used in (1). As shown in FIG. 2, the ice slurry surface processing apparatus of the present invention includes a supercooled water producing section 10 including an ice grain crystallizing plate 15 and forming ice grains used for a horning blast material, and a supercooled water producing section. Slurry storage tank 1 that forms an ice slurry by the ice particles formed by the ice and the stored cold water
6, a cold water re-supply path 20d for re-supplying the cold water stored in the ice slurry storage tank 16 to the supercooled water production unit 10, and an injection nozzle 2 for honing the ice slurry from the ice slurry storage tank 16
2 and a honing unit (surface processing unit) 21 for operating the injection nozzle 22 with high-pressure gas.

The supercooled water producing section 10 includes a cooler 11 for generating supercooled water from cold water 27 having a temperature of approximately 0 ° C. supplied from the ice slurry storage tank 16 via a cold water resupply path 20d.
And an air-cooling condensing unit 12 that supplies cold heat to the cooler 11. The cooler 11 is constituted by a brine cooler and can perform a heat storage operation. By controlling the temperature and the flow rate of the brine, the cooler 11 can cope with the temperature and the discharge amount of the supercooled water, and the supercooled water of approximately -1.5 ° C. Is obtained in a metastable state without freezing. The ice crystallizing plate 15 is disposed obliquely in the space directly above the ice slurry storage tank 16.
It is arranged above via a conduit 11 a, and the supercooling is released by the impact of the collision and freezes to form ice particles 29, which fall into the ice slurry storage tank 16.

The air cooling condensing unit 12
Uses a secondary refrigerant brine as a cooling medium for the cooler 11, and uses a primary refrigerant compressor, an air-cooled condenser, a liquid receiving tank, an expansion member, a brine cooler, etc., which are provided for cooling the brine. The refrigerating apparatus is well known and will not be described. Instead of using the brine as the secondary refrigerant as described above, a direct expansion type cooling system in which the primary refrigerant is directly introduced into the cooler 11 from the refrigerating device may be used.
As for the condensing unit 12, a water-cooled condensing unit can be used without using an air-cooled condensing unit, so that a water-cooled condensing unit is particularly preferable for a large size.

A preheater 13 is provided in the cold water re-supply passage 20d before the cooler 11, and the temperature of the cold water supplied through the hot water tank 14, the pump 14a and the filter 20c is adjusted, and the inside of the cooler 11 is adjusted. To prevent freezing. The heat source of the preheater 13 is hot water in the present specification, but as a result of examination, the heat source may be hot gas (high-temperature gas) from a condensing unit, and the heat source of the preheater may be hot water or a compressor. It is clear that any of the above-mentioned high-temperature gases may be used. The ice slurry storage tank 16 includes an ice particle 29 introduced from the supercooled water producing unit 10 including the ice particle crystallization plate 15 and a pump 22 from a honing unit 21 described later.
b, agitating the return water of the drainage 28 which is recirculated through the filter 22c via the stirring blade 18 and the motor 18a,
An ice slurry 26 having a stable maximum density is formed in the tank. When returning the drainage 28 into the ice slurry storage tank 16, the pump 22 b is pumped and the injection port is set near the surface of the storage tank 16 to generate a swirling flow in the group of ice particles 29 to reduce the stirring effect. I'm trying to raise it.

Also, fresh water can be replenished into the ice slurry storage tank 16 from the fresh water supply unit 17 at any time.
7a keeps the water level in the tank constant. Further, the cold water re-supply path 20d is provided from the lower part of the ice slurry storage tank 16, and cold water 27 near a constant temperature of approximately 0 ° C. is introduced into the preheater 13 and the cooler 11 through the pump 20a and the filter 20c. Thus, more stable ice particles can be obtained. Further, the transport path 19 is opened from the side wall of the ice slurry storage tank 16 to the highest concentration stable zone of the ice slurry, and the ice slurry sucked by the pump 19a is stably supplied at the highest concentration to the injection nozzle 22 of the honing unit 21. The compressed gas supply pipe 36
High-density ice slurry is sprayed at high speed onto the surface of the workpiece through high-pressure gas such as compressed air supplied from the factory, thereby enabling required fine processing and cleaning. At this time, the ice slurry loses latent heat to form a low-temperature drainage 28 at approximately 0 ° C. and is stored in the drainage tank 22a. The supernatant liquid is returned to the ice slurry storage tank 16 via the pump 22b and the filter 22c as described above, and is returned as water.

A cold water intake 20b for adjusting the slurry concentration is provided at the preceding stage of the slurry transport path 19, and a suitable amount of cold water close to 0 ° C. is replenished to the taken-in maximum concentration ice slurry to obtain a moderately stable water. The density is used to prevent clogging of the pipeline during the transport process. Further, it is desirable to provide a wire mesh having a predetermined mesh at the ice slurry intake port of the ice slurry storage tank 16 into the transport path 19 in order to stabilize the particle size distribution of the ice particles.

FIG. 3 shows a preferred embodiment of the ice slurry transport path of FIG. In the present embodiment, the transport path 23 is configured by a double pipe transport system, and is configured by an inner pipe 24 and an outer pipe 25, and the injection nozzle 2 of the honing unit 21.
2 is formed in a downwardly inclined tubular shape so that the ice slurry can be sent to the inner tube 24 by gravity drop, and the drainage (returned cold water) 28 stored in the drainage tank 22a of the liquid honing unit 21 is stored in the outer tube 25. The pump 22b, the filter 22
d, and is pumped up to the ice slurry storage tank 16 along the outside of the inner pipe 24 by pump-up and refluxed. In this case, the wastewater 2 flowing back through the outer pipe 25
8 is low-temperature water that has lost latent heat due to the honing, so that the outer wall of the inner tube 24 maintains a low temperature of about 0 ° C., automatically prevents clogging of ice particles in the inner tube, and maintains a stable ice slurry state. Can be maintained.

Since the ice slurry surface processing apparatus of the present invention has the above-described configuration, it is preferable to shift to a liquid blasting (liquid honing) operation through a process of precooling operation → ice making operation when used. First, at the time of the precooling operation, the water cooling circulation path of the ice slurry storage tank 16 → the cooler 11 → the ice slurry storage tank is formed, and the water stored in the ice slurry storage tank 16 is precooled. Then, the operation shifts to the ice making operation. In this case, the ice slurry storage tank 16 → the preheater 13 → the cooler 11 → the ice crystallizing plate 15 → the cold water circulation path of the ice slurry storage tank is formed. Is formed, and an ice slurry 26 having a stable concentration is formed in the ice slurry storage tank 16. After that, it shifts to blast operation, but in this case,
The following ice making operation and blast operation are performed in parallel.

In the ice making operation, the ice slurry storage tank 16
→ Preheating device 13 → Cooler 11 → Ice crystallizing plate 15 → Ice making while cooling water circulates through the path of ice slurry storage tank 16.
In the blast operation using the slurry in the ice slurry storage tank 16, the thrust step and the return step of the cold water are performed while circulating through the ice slurry storage tank → the honing unit 21 → the drainage recovery → the ice slurry storage tank 16. The tank 16 is successively replenished with fresh water based on a level sensor (ball tap) 17a.

Therefore, according to the present embodiment, the cleaning of the workpiece after processing can be performed simultaneously with the injection, and the production of the ice slurry is performed by releasing the supercooling water from the supercooling water. The size and discharge rate of ice particles can be controlled as needed using a brine cooler to obtain the required concentration of ice slurry, and the use of stable ice slurry can stabilize the blasting capacity. The initial cost can be kept low. In the above embodiment, the supercooling water releasing means is constituted by an impact plate for producing ice particles by collision of supercooling water having gravitational energy, but the supercooling means is not limited to this. Alternatively, the supercooled water may be constituted by an underwater release unit that produces ice particles by colliding with solid particles or air bubbles.

FIG. 4 shows an embodiment of the present invention using such an underwater release unit, and shows a detailed configuration of an ice slurry surface processing apparatus according to a third embodiment of the present invention. FIG. 5 shows an underwater release unit for releasing supercooled water applied to the ice slurry surface processing apparatus of FIG. The underwater release unit 40 of the present invention supplies the supercooled water supplied from the cooler 11 to the vertically long funnel-shaped spiral flow generation container 42 (underwater release unit) from the upper vertical introduction passage 42c. A passage 41 provided tangentially on the upper surface
To, by introducing 0 ℃ before and after the cooling water supplied from the ice slurry reservoir 16, to generate a spiral flow Y _1, with the introduction of the helical flow Y _1, from the ice slurry reservoir 16 minute particle species Introduce ice. With the introduction of the seed ice, the state of the supercooled water is changed (released in water) in the container 42, and supercooled ice particles are generated.

[0035] Then in a vessel, the seed ice and helical flow Y ₁ and over the cooling mixture stirred for vertical flow Z ₁ of water supercooling release is gradually propagated in an ice slurry reservoir 16 just above the position outlet 42a
As a result, the IPF (ice / filling ratio) increases, and supercooled ice / water is discharged to the ice slurry storage tank 16. Since the seed ice only triggers release in water, it is better not to enter the seed ice after the release. When the supercooling water is filled in the container, the supercooling is released regardless of the flow of the supercooling water.
To the side. For this reason, in the present invention, a vortex is given as a sub-flow, and the flow velocity near the wall surface of the container 42 is increased. Since the vortex is about 0 ° C., the propagation of the release is caused by the upstream cooler 11.
Propagation to the side can be easily prevented.

Also in this embodiment, since the production of the ice slurry is performed by canceling the supercooling of the supercooled water, the size and the discharge amount of the ice particles are controlled by using a brine cooler as needed. In addition, the required concentration of ice slurry can be obtained, the blast capacity can be stabilized by using a stable ice slurry, and the post-processing cleaning of the workpiece can be performed at the same time as the jetting, and the initial cost can be reduced. Can be kept low.

[0037]

As described above, according to the present invention, an ice slurry in which ice particles are mixed with water is sprayed on a workpiece to perform processing similar to liquid honing or liquid blasting.
By using ice slurry with a constant particle size and a constant ice particle discharge rate and a stable concentration, it is possible to stabilize the blasting capacity and without installing a separate stirring mixer. This enables compact and low-cost ice slurry surface processing. Further, according to the present invention, surface processing can be performed without damaging a soft workpiece that is easily damaged.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an ice slurry surface processing apparatus according to a first embodiment of the present invention.

FIG. 2 shows a detailed configuration of an ice slurry surface processing apparatus according to a second embodiment of the present invention.

FIG. 3 shows an ice slurry transport path applied to the ice slurry surface processing apparatus of FIG. 2;

FIG. 4 shows a detailed configuration of an ice slurry surface processing apparatus according to a third embodiment of the present invention.

FIG. 5 shows an underwater release section for supercooling water release applied to the ice slurry surface processing apparatus of FIG. 2;

FIG. 6 shows a schematic configuration of a conventional ice slurry surface processing apparatus.

[Explanation of symbols]

 Reference Signs List 10 supercooled water production unit 15 ice crystallized plate 16 ice slurry storage tank 19 transport path 21 honing unit 22 injection nozzle 23 double pipe transport path 26 ice slurry 27 cold water 29 ice particles

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[Procedure amendment]

[Submission date] May 16, 2000 (2000.5.1)
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

As one means for solving the above-mentioned problems, various ice blasting methods have been proposed in which ice particles or dry ice particles are used and jetted with high-pressure gas. For example, JP-A-58
In No. -102674, the ice particles only by utilizing the ejector to inject the treated surface technology, also KOKOKU 7-574 7
No. 1 discloses a technique for injecting frozen particles in a low-temperature atmosphere using a refrigerant evaporating gas, and WO 86/04536 discloses an ice blast technique using dry ice particles.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F25C 1/00 F25C 1/00 A (72) Inventor Hiromichi Fukumoto 2-3-1 Botan, Koto-ku, Tokyo Inside the Maekawa Works Co., Ltd. (72) Inventor Hisashi Kitagawa 2-13-1, Botan, Koto-ku, Tokyo Inside the Maekawa Works Co., Ltd. (72) Inventor ▲ Yes ▼ Akira Akira 2-1-1 Botan, Koto-ku, Tokyo No. Inside the Maekawa Works (72) Inventor Naokatsu Kojima 663-4 Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Prefecture

Claims (13)

[Claims] 1. An ice slurry surface processing method in which an ice slurry in which ice particles are mixed with water is sprayed onto a workpiece to perform processing similar to liquid honing or liquid blasting, wherein the ice particles are supercooled below a freezing point. Ice, which is supercooled ice particles obtained by changing the state of water by vortex water releasing means, and injecting an ice slurry obtained by mixing the ice particles and cooling water at a predetermined ratio onto a workpiece. Slurry surface processing method. 2. A collision plate for producing ice particles by collision of supercooled water having gravitational energy,
2. The method according to claim 1, wherein the subcooling unit is an underwater release unit for producing ice particles by colliding supercooled water with solid particles or air bubbles. 3. An ice slurry surface processing apparatus which performs processing similar to liquid honing or liquid blast by injecting an ice slurry in which ice particles are mixed with water into an object to be processed through an injection means, wherein supercooling below the freezing point is performed. An ice slurry comprising an apparatus for producing water and supercooled water releasing means for obtaining supercooled ice particles by changing the state of the supercooled water, wherein the supercooled water releasing means mixes ice particles and cooling water. An ice slurry surface processing device that is located on a storage tank. 4. The ice slurry surface processing apparatus according to claim 3, wherein said supercooling water releasing means is a collision plate for producing ice particles by collision of supercooling water having gravitational energy. 5. The ice slurry surface processing according to claim 3, wherein said supercooled water releasing means is an underwater releasing section for producing ice particles by colliding the supercooled water with solid particles or air bubble particles. apparatus. 6. A means for adjusting a mixing ratio (ice slurry concentration) between ice particles of ice slurry and cooling water sprayed on the workpiece is located on a slurry transport path between the ice slurry storage tank and the spraying means,
4. The ice slurry surface processing apparatus according to claim 3, wherein the cooling water is cooling water near the freezing point introduced from the bottom of the ice slurry storage tank. 7. A monitoring means for monitoring the concentration of ice slurry injected onto the workpiece on a path circulating in the ice slurry storage tank.
The described ice slurry surface processing apparatus. 8. The ice slurry produced by the ice slurry production section is guided to a surface processing section via an ice slurry transport path, and is jetted to a workpiece through an injection means operated by a high-pressure fluid in the surface processing section. In the ice slurry surface processing apparatus for performing surface processing, the ice slurry manufacturing unit includes a supercooled water manufacturing unit that forms ice particles by releasing supercooling of supercooled water, and receives and stores the formed ice particles. It is characterized by comprising an ice slurry storage tank that forms an ice slurry by stirring and mixing with cold water, and an ice slurry concentration adjusting section provided at a front stage of a transport path that guides the ice slurry from the ice slurry storage tank to the injection means. Ice slurry surface processing equipment. 9. The supercooled water producing section includes a cooler for forming supercooled water from chilled water, and a supercooled water canceling means for canceling supercooled water, and includes a chilled water temperature adjusting section in front of the cooler. The ice slurry surface processing apparatus according to claim 8, wherein the apparatus is provided. 10. The concentration adjusting section is configured to supply an appropriate amount of cold water in an ice slurry storage tank to a high-concentration ice slurry from an ice slurry storage tank and adjust the concentration in a stage preceding the transport path. Item 10. An ice slurry surface processing apparatus according to item 8. 11. The ice slurry surface processing apparatus according to claim 8, wherein the ice slurry storage tank has a circulation path for collecting and recirculating waste water from an injection means of the surface processing section and using the recovered water as cold water. 12. The transporting path comprises a double pipe transporting path connecting the ice slurry storage tank and the injection means, and the ice slurry is transported to the injection means by gravity drop or pressure feeding to the inner pipe of the double pipe. 9. The ice slurry surface processing apparatus according to claim 8, wherein the outer pipe has a forward / reverse transport path structure in which the drainage of the injection means is supplied to the outer side of the inner pipe and fed back. 13. The supercooling water releasing means produces an ice plate by colliding supercooled water having gravitational energy to produce ice particles, or colliding supercooled water with solid particles or air bubbles to produce ice particles. The ice slurry surface processing apparatus according to claim 9, comprising an underwater release section.