JP2000296438A - Cooling gas spray device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive, simple-construction cooling gas spray device that can remove heat, chips and the like generated typically in machining of micro precision components and in grinding machining, by spraying cooling gas from its nozzle over tools and workpieces, and that is free of freezing of the nozzle. SOLUTION: This cooling gas spray device has an inner nozzle 3 and an outer nozzle 4 encircling the outer wall of the inner nozzle 3 to define a passage in between. The inner nozzle 3 is supplied by a cooling air generator 1 with cooling air 9, and the outer nozzle 4 is supplied by a dehumidifier 2 with dehumidified or dry air 10 of a temperature between the freezing point and ordinary temperature of water. The inner nozzle 3 spouts the cooling air 9 and the outer nozzle 4 spouts the dry air 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling gas blowing device for blowing a cooling gas to a tool or a workpiece to cool the tool or workpiece during machining such as cutting, grinding, and drilling.

[0002]

2. Description of the Related Art Conventionally, such cutting, grinding,
At the time of drilling or the like, a large amount of water-soluble cutting fluid is caused to flow through a tool or a workpiece to reduce frictional resistance generated at the time of processing and to remove frictional heat. However, this method may cause environmental pollution.

For this reason, in recent years, from the viewpoint of preventing the above-mentioned environmental pollution, a method has been proposed in which cooling air is blown onto a tool or a workpiece to remove the generated heat and perform processing. However, in this method, since the cooling air has a higher velocity than the surrounding humid air, the air is drawn into the flow interface of the jetting cooling air. As a result, moist air is also entrained at the tip of the nozzle that jets cooling air, and ice is generated at the nozzle.
It grows and this ice suddenly drops and damages the workpiece,
There was a risk of damaging the tool. In addition, when the nozzle is covered with a heat insulating material or the like, the outer diameter of the nozzle becomes large, and there is a possibility that the distance from the processing portion to the nozzle is limited.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to supply a cooling gas from a nozzle to a tool or a workpiece during processing such as processing of minute precision parts or processing by grinding. To provide a simple and inexpensive cooling gas spraying device that can remove heat and chips generated in a processing portion (time) by spraying the same on the object, and at the same time, does not cause ice on the nozzle. is there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an inner nozzle, and an outer nozzle surrounding the outer wall of the inner nozzle to form a flow path. While supplying a cooling gas from the outside nozzle, supplying a dehumidified dry gas at a temperature equal to or higher than the freezing temperature of water and equal to or lower than room temperature from the dry gas supply means to the outer nozzle, and blowing the cooling gas from the inner nozzle, and from the outer nozzle. Is a cooling gas spraying device configured to blow out the dehumidified dry gas. As described above, since the cooling gas is blown out from the inner nozzle and the dehumidified dry gas is blown out from the outer nozzle at a temperature equal to or higher than the freezing temperature of water and equal to or lower than room temperature, heat generated by processing is taken away by the cooling gas. The cooling can be performed. At the same time, the formation of ice on the nozzle portion can be prevented by the dry gas flowing into the outer nozzle. That is, it is possible to easily perform cooling without generating ice on the nozzle, and it is possible to perform processing of small precision components having a small heat capacity or processing by grinding with an inexpensive apparatus while preventing environmental pollution.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a cooling air blowing device (cooling gas blowing device) according to a first embodiment of the present invention, and FIG. Figure (b) shows nozzle A
It is the figure which looked at the schematic structure of the part from the upper side.

As shown in FIG. 1, the cooling air blowing device comprises a cooling air generating device 1 for generating cooled air,
The apparatus includes a dehumidifier 2 for dehumidifying compressed air to generate dry air, and a nozzle A. 1 shown in FIG.
Reference numeral 1 denotes a tool (in the illustrated example, a grindstone of a grinder is shown,
Reference numeral 12 denotes a workpiece (the workpiece may also be of various shapes and structures).

Here, the nozzle A includes an inner nozzle 3 and an outer nozzle 4 surrounding the outer wall of the inner nozzle 3 to form a flow path. The inner nozzle 3 is formed so as to have a wide, substantially flat shape at the tip, and the outer nozzle 4 is formed into a wide, substantially flat shape in accordance with the shape of the tip of the inner nozzle 3.

The cooling air generator 1 is connected to the inner nozzle 3 via a conduit 5. The dehumidifier 2 is connected to the outer nozzle 4 via a conduit 6, and compressed air 8 is introduced into the dehumidifier 2 via a conduit 7. The temperature of the dehumidified dry gas supplied from the dehumidifier 2 to the outer nozzle 4 is set to be equal to or higher than the freezing temperature of water (steam) and equal to or lower than normal temperature.

In the cooling air blowing device having the above structure, when the cooling air generator 1 and the dehumidifier 2 are operated at the same time as rotating the tool 11 to process the workpiece 12, the cooling air generated by the cooling air generator 1 9 is introduced into the inner nozzle 3 through the conduit 5 and blows out from the tip of the inner nozzle 3, while the dry air 10 dehumidified by the dehumidifier 2 is introduced through the conduit 6 to the outer nozzle 4 and 4, the cooling air 9 and the drying air 10 are blown to the processing portion of the tool 11 and the workpiece 12, and the cooling air 9 blows the tool 11 and the workpiece 12. The heat generated by the processing is taken away, so that the processing can be performed while being cooled.

At this time, since the dry air 10 flows through the outer nozzle 4, even if the outer wall of the inner nozzle 3 is cooled by the cooling air 9, ice is prevented from being formed on the outer wall of the inner nozzle 3, and The outer nozzle outer wall is not cooled by the cooling air in the inner nozzle due to the temperature of the dry air being equal to or higher than the freezing temperature of water vapor and the heat insulating effect of the dry air 10, so that the outer wall of the outer nozzle 4 that is in contact with the humid atmosphere No icing occurs.

Further, since the dry air 10 is blown around the cooling air 9, the moist atmosphere is not entrained at the nozzle tip.
No ice is formed on the tip).

FIG. 2 shows a nozzle A of a cooling air blowing device (cooling gas blowing device) according to a second embodiment of the present invention.
It is the figure which looked at the schematic structure of the part from the upper side (the figure which shows the part corresponding to Drawing 1 (b)). In the drawing, the same or corresponding portions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

This embodiment differs from the embodiment shown in FIG. 1 in that the tip of the outer nozzle 4 is
The point is that it protrudes slightly forward from the tip of. With this configuration, since the flow velocity of the dry air in the outer nozzle 4 is high, it is easy to coat the tip of the inner nozzle 3 with the dry air, and the dry air 10 is more reliably blown around the cooling air 9. Therefore, the moist atmosphere is not entrained at the nozzle tip. Therefore, ice is not more reliably generated at the nozzle tip (particularly, the tip of the inner nozzle 3).

FIGS. 3 and 4 are diagrams showing specific examples of the nozzle A portion formed by using the second embodiment shown in FIG. 2, and FIGS. 3 (a) and 4 (a) are plan views. 3 (b) and 4 (b) are side sectional views, FIGS. 3 (c) and 4 (c) are left side views, and FIGS. 3 (d) and 4 (d) are FIGS. 3 (c). , FIG. 4 (c)
3 is an enlarged view of part X of FIG.

Each of these nozzles A is provided with an inner nozzle 3 and an outer nozzle 4 surrounding the outer wall of the inner nozzle 3 to form a flow path, as in the first and second embodiments. I have. The upper and lower surfaces of the inner nozzle 3 are tapered toward the tip, and the width thereof is widened in a tapered shape toward the tip, so that the inner nozzle 3 is substantially flat as a whole. On the other hand, the outer nozzle 4 has a tapered upper and lower surface toward the tip substantially in conformity with the outer peripheral shape of the inner nozzle 3, and its width widens in a tapered manner toward the tip, so that the outer nozzle 4 has a substantially flat shape as a whole. Is formed. The tip of the outer nozzle 4 projects forward from the tip of the inner nozzle 3.

A number of nozzle holes 33 are provided in parallel at the most distal end of the inner nozzle 3. FIG.
4D, a thin slit-shaped nozzle hole 43 for blowing dry air is provided between the tip of the inner nozzle 3 and the tip of the outer nozzle 4 so as to surround the inner nozzle 3. I have. On the other hand, a cooling air introduction hole 37 is provided at a rear end portion of the inner nozzle 3, and a dry air introduction hole 47 is provided at a rear end portion of the outer nozzle 4.

In a space between the outer nozzle 4 and the inner nozzle 3, that is, a space serving as a passage for dry air, two or three reinforcing and rectifying plates 45 partitioning the space in the vertical direction are parallel and symmetrical. It is attached to the position that will be.

If the reinforcing and rectifying plates 45, 45 are provided in the passage of the dry air in the outer nozzle 4 as in these specific examples,
Since the dry air 10 is rectified and blown out from the tip of the outer nozzle 4 without any disturbance, the dry air 10 is blown out more surely so as to surround the cooling air 9 and the nozzle A
The humid atmosphere will not be trapped at the tip of the device.
The reinforcing and rectifying plates 45 also function as reinforcing plates for preventing the upper and lower outer walls of the nozzle A from being deformed.

Although not described in this specific example, a similar reinforcing and rectifying plate may be provided inside the inner nozzle 3. By doing so, the reinforcement is further ensured and the cooling air can be rectified.

By the way, in each of the above examples, the shape of the nozzle A is
The outer nozzle 4 is provided so as to surround the outer wall of the inner nozzle 3 whose flat surface is trapezoidal and the tip is flat, but the shape of the nozzle is not limited to this, and surrounds the outer wall of the inner nozzle 3. So that the cooling air 9 is blown out from the inner nozzle 3 and is dried from the outer nozzle 4 in a state surrounding the cooling air 9 so that the outer nozzle 4 is provided and the tool and the workpiece can be cooled effectively. Any shape that can blow out the air 10 may be used.

The cooling gas blowing apparatus of the present invention is not limited to the above-mentioned method of use, that is, the method of blowing cooling air from the nozzle A to the tool 11 and the workpiece 12 of the grinding machine. It can be widely used for cooling tools and workpieces during drilling and other processing. In the above-described embodiment, an example in which air is used as a gas has been described. However, the present invention is not limited to air. For example, another gas such as an inert gas (for example, nitrogen gas) Is preferable).

In the above embodiment, the cooling gas supply means is constituted by the cooling air generating device 1 and the conduit 5. However, the present invention is not limited to this structure. In short, the cooling gas supply means has a structure for supplying the cooling gas to the inner nozzle. Any structure may be used. In the above example, the dry gas supply means is constituted by the dehumidifier 2 and the conduit 6. However, the present invention is not limited to this structure. The point is that the dehumidified dry gas having a temperature higher than the freezing temperature of water and lower than the normal temperature is supplied to the outer nozzle. Any structure may be used as long as it is a dry gas supply unit having a supply structure.

[0024]

According to the present invention, as described in detail above,
According to the invention described in the above, the cooling gas spraying device comprises an inner nozzle, an outer nozzle surrounding the outer wall of the inner nozzle to form a flow path, while blowing the cooling gas from the inner nozzle and water from the outer nozzle It is configured to blow out dehumidified dry gas at a temperature higher than the freezing temperature and lower than the normal temperature, so that the heat generated by processing can be taken away by the cooling gas and cooled, and at the same time the dry gas flowing to the outer nozzle Thereby, generation of ice on the nozzle portion can be prevented. That is, if the apparatus of the present invention is used, cooling can be easily performed without generating ice on the nozzle, and processing of minute precision parts having a small heat capacity, processing by grinding, etc. can be performed with an inexpensive apparatus to reduce environmental pollution. It is possible to obtain an excellent effect that it can be carried out while preventing.

According to the invention described in claim 2 of the present application,
Since the tip of the outer nozzle protrudes forward from the tip of the inner nozzle, it becomes easier to coat the tip of the inner nozzle with the dry gas, and the dry gas is more reliably blown around the cooling gas and is more reliably sprayed. Ice is not generated in the portion (particularly the tip of the inner nozzle).

According to the invention described in claim 3 of the present application,
In the outer nozzle or the inner nozzle, a straightening plate for rectifying the dry gas or the cooling gas is installed, so that the dry gas or the cooling gas is rectified, and the undisturbed dry gas or the cooling gas is blown out from the nozzle tip. Dry gas is blown out more reliably so as to surround the cooling gas, and ice is not more reliably generated at the nozzle tip. Further, since these rectifying plates can be used as reinforcing plates, deformation of the nozzle can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cooling air blowing device according to a first embodiment of the present invention. FIG. 1 (a) is a diagram of the overall schematic configuration viewed from a side, and FIG. It is the figure which looked at the schematic structure of the part from the upper side.

FIG. 2 is a diagram showing a schematic configuration of a nozzle A portion of a cooling air blowing device according to a second embodiment of the present invention as viewed from above.

FIG. 3 is a view showing a specific example of a nozzle A portion, and FIG.
3 (a) is a plan view, FIG. 3 (b) is a side sectional view, FIG. 3 (c) is a left side view, and FIG. 3 (d) is an enlarged view of a part X in FIG. 3 (c).

4A and 4B are diagrams showing another specific example of the nozzle A portion, wherein FIG. 4A is a plan view, FIG. 4B is a side sectional view, and FIG.
4D is a left side view, and FIG. 4D is an enlarged view of a part X in FIG. 4C.

[Explanation of symbols]

 A Nozzle 1 Cooling air generator 2 Dehumidifier 3 Inner nozzle 4 Outer nozzle 5 Conduit 6 Conduit 7 Conduit 8 Compressed air 9 Cooling air (cooling gas) 10 Dry air (dry gas) 11 Tool 12 Workpiece 45, 45 Straightening plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satomi Hamada 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa F-term in Ebara Research Institute, Inc. (reference) 3C011 EE01 4F033 QA04 QB02X QB02Y QD21 QD24 QE21 QF07Y QG47

Claims (3)

[Claims] An inner nozzle, an outer nozzle surrounding the outer wall of the inner nozzle to form a flow path, supplying cooling gas from a cooling gas supply unit to the inner nozzle, and drying gas to the outer nozzle. Supplying dehumidified dry gas at a temperature equal to or higher than the freezing temperature of water and equal to or lower than room temperature from the supply means, and blowing out the cooling gas from the inner nozzle, and blowing the dehumidified dry gas from the outer nozzle. Characteristic cooling gas blowing device. 2. The cooling gas blowing device according to claim 1, wherein a tip of the outer nozzle projects forward from a tip of the inner nozzle. 3. The cooling gas spraying device according to claim 1, wherein a rectifying plate for rectifying a dry gas or a cooling gas is mounted in the outer nozzle or the inner nozzle.