JPH0584637A - Cooling device for cutting at low temperature - Google Patents

Abstract

PURPOSE:To provide a cooling device for cutting which cools only the local place where machining material is put in a machining tank to adequate temperature and does not cool other places in the machining tank in a device which maintains machining materials at low temperature in order to cut the material which has considerable elasticity at normal temperature such as rubber. CONSTITUTION:A cooling device for cutting at low temperature is composed of a device which injects air being cooled to lower temperature than temperature in a machining tank 1 by a cooling coil 2 to the vicinity of local place and sucks the air by an another duct 9 to return it into the cooling coil 2 and a device for producing an stream which circulates in the machining tank 1 openly. As place other than the local place where machining material is put is not cooled, worker's hand and fingers are not cooled excessively even if he puts them in the machining tank 1, frost does not occur in the machining tank, and energy loss is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for low-temperature cutting, and particularly to a fluid such as air or water (hereinafter referred to as fluid) cooled to a temperature lower than the temperature in a machining tank by a cooling coil. A device for ejecting from a jet port that opens locally near the inside of a processing tank through a low temperature duct, and a fluid in the vicinity is sucked from an opening of a suction duct provided in the vicinity of the jet port, and the fluid thus sucked again Cooling device for low-temperature cutting, which includes a device for returning to a cooling coil, a device for additionally recirculating a fluid in the processing tank in addition to the above device, and an air curtain added to the above device Is.

[0002]

2. Description of the Related Art Materials such as rubber, plastics and natural resins which have considerable elasticity, viscosity or plasticity at room temperature are used as materials, and the materials are subjected to precise cutting with a high frequency cutting machine or a polishing machine. There is a work of performing, for example, engraving of a rubber stamp, and a work of finely engraving a metal plate laminated with plastic. When performing such work, it is appropriate to cool the processing material to temporarily lose properties such as elasticity of the processing material, make it rigid and brittle, and perform the above cutting processing. However, such a construction method and various devices used for the construction method have already been provided.

Conventionally, as a conventional device for cooling a material for the above purpose, a device for spraying liquid nitrogen onto a processing material to cool it, or a processing tank filled with a cooled fluid (air or water) is used. A structure having a structure in which a processing material is put in and the processing such as cutting is performed while the processing material is cooled by a cooled fluid around the processing material has been usual.

However, the above-mentioned cutting machine which is sprayed with liquid nitrogen has a high cost and the temperature is too low, so that it is zero degrees Celsius or below zero.
In the case of a processing material that can be cooled to about 0 degrees, the temperature will rather be too low, making processing difficult, and reducing energy consumption.
There were drawbacks such as large loss. Even in a device that processes a processing material by putting it in a processing tank filled with a cooled liquid, the conventional processing tank has a structure other than the place where the processing material is to be cooled (hereinafter referred to as "local"). Since the entire bath is cooled to a temperature suitable for processing as well as locally, cooling energy is wasted, and it is easy for frost to form in the processing tank, and the operator can touch the processing tank with fingers. There is a drawback in that when the work is put in, the fingers are extremely cooled and the work becomes difficult.

[0005]

The problem to be solved is that among the conventional cooling devices for low temperature cutting, the device for spraying liquid nitrogen is unsuitable except when extremely low temperature is required. The structure of the processing tank filled with the cooled liquid was to cool the entire inside of the processing tank other than local to the proper processing temperature, so that cooling energy is wasted and the operator puts his / her fingers inside the processing tank. When putting it in and working, it was difficult to work because the fingers were too cold.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks in a conventional cooling device for low-temperature cutting using a low-temperature processing tank, and the temperature inside the processing tank is locally processed. It provides a cooling device for low temperature cutting, which is cooled to an appropriate temperature and is configured to have a higher temperature in other places in the processing tank. A device that ejects the fluid cooled to a low temperature from a jet port that opens locally near the inside of the processing tank through a low temperature duct, and a fluid near the jet port that sucks the fluid near the jet port. , A cooling device for low temperature cutting, which comprises a device for returning this to the cooling coil again, and a part of the low temperature fluid generated by the cooling coil is sent out for local cooling by the low temperature duct, Is a cooling device for low-temperature cutting that has a structure in which some of the low temperature fluid is circulated in the processing tank in an open manner, and this cools the inside of the processing tank other than local such as the conventional method to the same extent as local. The energy loss due to this is prevented, and by circulating the locally cooled liquid in the cooling coil, the cooling energy can be saved, and the worker's fingers are not over-cooled, so that work efficiency is improved. It is something that can be demonstrated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 is a conceptual sectional view of a cooling device for low temperature cutting according to an embodiment of the present invention, in which a processing tank 1 is a box, in which a cooling coil 2 (cooling part of the cooling device) is installed, The cooling coil 2 is connected by a refrigerant duct 3 and 3'to another engine (not shown) that constitutes a cooling device such as a compressor and a radiator.

A blower fan 4 is attached to one end of the cooling coil 2, and the cooling coil 2 is attached by the blower fan 4.
The cool air cooled in the inside is discharged by the low temperature duct 5 to the jet port 6
It has a structure in which it is jetted out from and is locally cooled on the processing table 7.

An intake fan 8 is attached to the other end of the cooling coil 2. The intake fan 8 draws in the air near the local area from an opening 10 of the intake duct through an intake duct 9. The cooling coil 2 is returned to the cooling coil 2.

Separately from the above, an in-vessel blower port 11 is provided at one end of the device of the blower fan 4, and a part of the cool air cooled in the cooling coil 2 is fed from the in-vessel blower port 11 into the processing tank 1. In addition, an internal air inlet 12 is provided at one end of the device of the intake fan 8 to suck the air in the processing tank 1 and return it to the cooling coil 2. Part of the air cooled by the cooling coil 2 by the processing tank 1
It has a structure that allows it to be circulated openly.

As is clear from the above description and the drawings, circulating the air openly does not force the air to circulate through the blower duct, but once the air is blown from inside the tank into the processing tank. This is a representation of the circulation of air that is released to the air and is drawn into the in-tank inlet along a free path. Of course, the air ejected from the ejection port of the low temperature duct is also released at the time of ejection, but it is immediately inhaled from the opening of the suction duct, but this is not the case. It is a representation of that.

In the above-described embodiment, a structure in which the blower fan 4 for local cooling and the intake fan 8 are also used as the device for circulating the air openly in the tank is exemplified, but the device is not limited to this, and the cooling coil 2 is not limited thereto. A structure may be provided in which an in-tank air vent and an in-tank air intake are provided at one end, and air in the tank is circulated by an air blowing / intake device that is different from each fan. Of course, it is desirable to add a device for adjusting the air inside the processing tank so that the air inside the processing tank is always constant, by interlocking the above-mentioned in-vessel ventilation port with a separately provided temperature sensor.

Further, in the embodiment shown in the above drawings, the opening 13 provided in the processing tank 1 is thermally heated by the air flow (air curtain) generated by the air curtain fans 14 and 14 'provided on both sides thereof. A partition structure is shown. The operator inserts his / her fingers into the opening 13 from here,
In this case, a processing material is placed on the processing table 7 to perform a processing operation, and a processing tool (not shown) such as a cutting machine is installed on the processing table 7 in that case. In addition, if the opening 13 is thermally partitioned by the air curtain, it does not prevent the operator's fingers or the processing material from being taken in and out, and further reduces the cold air in the processing tank 1 to the outside. , Which leads to the saving of heat energy.

Of course, the above-mentioned air curtain is not provided, the opening 13 is left open, and the fingers are inserted from there to perform the working operation, or the opening 13 is closed with transparent glass or the like. Needless to say, the structure may be such that the work such as cutting is performed by remote control. It should be noted that it is desirable that the box constituting the processing tank is adiabatic.

The cooling coil 2 does not necessarily have to be installed in the processing tank 1, but the cooling coil 2 is installed outside the processing tank, and from there, the low temperature duct 5, the suction duct 9, the in-tank blowing port 11, Alternatively, the structure may be such that the processing tank 1 is connected to the processing tank 1 through the tank suction port 12 or the like.

The cooling device for low-temperature cutting processing of the present invention constructed as described above operates as follows. That is, the cooling of the local vicinity is performed by ejecting the cool air from the cooling coil 2 from the ejection port 6 through the low temperature duct, and most of the cool air is at the opening 10 of the suction duct 9.
The air that is sucked in from the tank and circulates to the cooling coil 2 again, and the air that circulates openly from the in-tank air blowing port 11 into the tank is returned to the cooling coil 2 from the in-tank intake port 12. As described above, the structure has a heavy reflux. By the way, since the air for cooling the local portion is directly supplied with the air cooled by the cooling coil 2 through the low temperature duct 5, the temperature tends to be lower than that of the air which is circulated openly in the processing tank 1. Conversely, when the cooling device is adjusted so as to cool the above-mentioned local portion to the processing appropriate temperature, the air that circulates openly in the tank tends to be higher than the processing appropriate temperature and lower than the outside air. ..

Of course, the temperature of the local cooling air is also
The temperature of the air circulated in the tank can be controlled to be an appropriate temperature by each adjusting device, but with the structure that the temperature in the tank is not higher than the local temperature as described above. Therefore, the temperature adjustment described above can be easily performed. Therefore, the difference between the temperature of the outside air and the temperature in the processing tank (the temperature of the air that circulates openly) need not be so large.

In the above-mentioned embodiment, an example in which air is used as a cooling fluid is shown, but the present invention is not limited to this, and low temperature cutting processing of a structure in which the processing material is cooled by water contained in a water tank It can also be implemented as a cooling device for vehicles, and when engraving something that easily reacts with air or water, such as metallic sodium, shuts off air and water such as petroleum. It can also be implemented in the case where a liquid is used or a machining tank is filled with a lubricant for improving lubrication during cutting for cooling. Needless to say, the cutting process in this specification includes a polishing process and the like.

[0019]

As described above, according to the present invention, first, the fluid cooled to a temperature lower than the temperature in the processing tank by the cooling coil is ejected locally through the low temperature duct, and at the same time by the suction duct, the fluid near Since the fluid is returned to the cooling coil again, most of the fluid returned to the cooling coil is at a low temperature near the local area.
(1) The temperature difference for cooling again by the cooling coil is small, the load on the cooler is lightened accordingly, and cooling energy can be saved.

Next, in addition to the duct for cooling the local portion to the proper processing temperature, the apparatus for recirculating the cooled fluid to the processing tank in an open manner is provided, as described above, only the local portion is cooled to the proper processing temperature. Even if it is done, the fluid at a temperature higher than that will flow back to a location other than the local location in the processing tank, and the outside of the processing tank will have a higher temperature.
(2) First, even when the worker puts his / her fingers in the processing tank to perform the processing work, the temperature is not so low except for the local area, so that the fingers are prevented from being over-cooled and the work is disturbed. It is released from the use of a thick hand bag, etc., and (3) the temperature difference between the fluid that recirculates openly in the processing tank and the air outside the processing tank is reduced accordingly. The heat loss flowing outside is reduced by that much, which also leads to energy saving,
(4) The presence of the flow of air that recirculates openly and the temperature of the air that is higher than the local temperature are combined to prevent the adverse effects such as frost formation in the processing tank. It

Further, in the case where the opening of the processing tank is partitioned by the air curtain, (5), the operator does not obstruct the work of putting the processing material and fingers into and out of the processing tank, It will prevent the dissipation of heat energy.
The one with the processing table installed in the processing tank is (6),
Since the cutting work can be performed by placing the work piece on the working table, the work piece is fixed and the working work is facilitated. (7), the working table has a polishing machine, Since a cutting tool or the like can be attached, the working operation is further facilitated.

[Brief description of drawings]

FIG. 1 is a conceptual sectional view of a cooling device for low temperature cutting according to an embodiment of the present invention.

[Explanation of symbols]

 1 Processing Tank 2 Cooling Coil (Cooling Unit of Cooling Device) 3,3 'Refrigerant Duct 4 Blower Fan 5 Low Temperature Duct 6 Jet Port (of Low Temperature Duct) 7 Processing Table 8 Intake Fan 9 Intake Duct 10 (Intake Duct) Opening Part 11 Ventilation port in the tank 12 Air intake port in the tank 13 Opening part of the processing tank 14, 14 'Fan for air curtain

Claims (3)

[Claims] 1. A device for ejecting a fluid cooled to a temperature lower than the temperature in the processing tank by a cooling coil from a jet opening that opens locally near the processing tank through a low temperature duct, and a device near the jet outlet. A cooling device for low-temperature cutting, comprising: a device for sucking the fluid in the vicinity of the local portion through an opening of the suction duct provided, and for returning the sucked fluid to the cooling coil again. 2. In addition to sending a part of the low temperature fluid generated by the cooling coil for local cooling by the low temperature duct, another part of the low temperature fluid is circulated openly in the processing tank. Item 1. A cooling device for low-temperature cutting according to item 1. 3. The cooling device for low temperature cutting according to claim 1, wherein the opening of the processing tank is partitioned by an air curtain.