JP3728457B2 - Machining plant cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to lubrication and cooling oil for each processing machine in a machining factory equipped with a plurality of machine cold wind machines such as NC machine tools for grinding and cutting, machining machines such as machining centers, and cold wind machines. The present invention relates to a cooling system for a machining factory in which a central cold brine circulation system and a cold heat source are provided for cooling of a working fluid, cold air grinding, and cold air cutting air.
[0002]
[Prior art]
Recent machining has been put into the process of change described below to meet the demand for improved machining accuracy and prevention of environmental pollution. That is,
In recent machining, especially in wet grinding, the grinding oil contains a high-pressure additive such as sulfur (S), phosphorus (P), chlorine (Cl), etc., in order to improve the lubricating effect. Mist containing these additives during spraying is scattered in the form of sprays, which not only causes deterioration of the work environment and pollution, but it also entails a huge amount of money even when used oil processing waste oil, especially containing chlorine. However, the disposal of grinding fluids requires high-temperature processing that can damage the furnace so that dioxins are not generated.
The appearance of a grinding method that does not use a grinding oil has been strongly demanded from the problem of health management for workers due to the deterioration of the working environment and the problem of environmental pollution caused by disposal of the grinding oil.
[0003]
In order to meet the above demands, the inventors of the present application previously proposed a cold air grinding method as an alternative to a wet grinding method using a grinding oil, which solves the above-mentioned problems of health management and environmental pollution of the operator, and grinding. In terms of characteristics, it is possible to obtain better results than the wet grinding method, and it has been elucidated that the economic effect of saving the purchase cost of the grinding oil and the waste disposal cost of the grinding oil can be obtained. In.
[0004]
As mentioned above, cold air machining is possible not only for cold air grinding but also for cold air cutting, and in order to eliminate waste liquid and waste oil discharge to the environment, the introduction of cold air machining method that does not use grinding oil, cutting oil or liquid is not possible It is considered an urgent need.
[0005]
In addition, it is widely known that the machining accuracy error due to deformation of the machine body due to changes in the machine environmental temperature and the heat generated by the machine itself is 10 to 20 times the static accuracy error. Therefore, recently, the cooling oil, which has been controlled to keep the temperature of each part of the machine as small as possible with respect to the ambient temperature, is circulated through the bed, column, table saddle, etc., which are the main components of the machine, to circulate the machine temperature at room temperature. There is a tendency to introduce a technique for reducing the geometric dimension error of the workpiece due to thermal deformation while keeping the temperature close to.
[0006]
In addition, maintaining the proper temperature of the lubricating oil is considered to be a means of improving machining accuracy in order to cope with the recent trend of high-speed rotation of the spindle. Optimal temperature holding control to minimize variations in the ambient temperature of the cutting oil along with the lubricating oil. Means are also being developed and used.
[0007]
By the way, the cooling means accompanying the introduction of a technique for maintaining the appropriate temperature such as cooling oil, lubricating oil, cutting oil, etc. for improving the processing accuracy is provided for each processing machine in a variety of individual modes. The factory as a whole is not in a rational system arrangement.
[0008]
For example, in a group of machine tools such as NC machine tools and machining centers, the cooling oil for machine temperature control for maintaining lubricating oil and accuracy and the cooling for optimal temperature control of the processing fluid are individually cooled. For example, as shown in FIG. 3, in a group of a plurality of machining machines including an NC grinding machine 50, an NC cutting machine 51, an NC machining machine 52, machining centers 53, 54, etc., as shown in FIG. The NC cutting machine 51 is provided with an oil tank 55a and an oil cooler 55b individually, the NC processing machine 52 is provided with an oil tank 55a and two oil coolers 55b, and the machining center 53 has one machine. Three oil coolers 55b are provided for the oil tank 55a, and four oil coolers 55b are provided for the one oil tank 55a in the machining center 54.
As described above, in some cases, a cooling device composed of 3 to 4 oil coolers is arranged around the periphery, and there is considerable space around these NC machine tools and machining centers because of the cooling device. As needed, the surroundings are cluttered.
In addition, if it is necessary to install a cold air generator accompanying the introduction of cold air grinding and cold air cutting, the above-mentioned chaotic installation situation will be doubled, leading to a situation that affects production efficiency.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and is required for a machine cold air processing machine group including a cold air processing machine group and a machine working machine group for improving machining accuracy and environmental measures in a machining factory. In order to cope with the complexity and sophistication of the above, a cold brine manufacturing apparatus, which is a common cold heat source, is provided for a plurality of machine cold air processing machine groups or machine cold air processing machine groups aggregated for each factory. Providing a cooling system for environment-friendly machining factories that saves space and energy by providing a central cooling system that transports cold heat to the machine cold air processing machine group on the load side through the supply line and distributes it to each machine. It is intended.
[0010]
[Means for Solving the Problems]
Therefore, in the machine cold wind working machine group consisting of the cold wind working machine group and the machine working machine group, a cold heat source and a cold supply system are provided, and a cold heat receiving end is provided for each machine of the machine cold wind working machine group, Cold heat is conveyed from the cold heat source through a common supply line, and cold heat is distributed and supplied to each processing machine.
That is, the cooling system of the machining factory according to the present invention includes a control heat exchanging unit that cools and controls lubrication, cooling oil, and processing liquid to an appropriate temperature and a cold heat exchanging unit for generating cold air to a group of machine cold wind machines on the load side. And a cold heat source that supplies cold heat to the circulation system, and a cold heat source that supplies cold heat to the circulation system.
[0011]
In addition, the control heat exchanging unit is composed of an oil / brine heat exchanger, the cold heat generating unit for generating cold air is composed of an air / brine heat exchanger, and for the cold air processing machine, the control unit exchanges heat with the cold heat exchanging unit. And a control heat exchanging unit is provided for the machining machine, and the control heat exchanging unit is operated at a relatively low temperature by exhaust heat of the cold heat exchanging unit.
[0013]
[Action]
According to the technical means related to the first aspect of the present invention, the cooling system of the machining factory is required to improve the processing accuracy of the processing machine and increase the demand for prevention of environmental pollution for waste oil treatment. In response to demands for a high level of technology, the conventional cooling method that has been supported without cooperation between the machines has been dealt with throughout the factory and the entire group to save space and energy. It is a thing.
[0014]
For this purpose, each of a plurality of machine tool groups such as NC machine tools and machining centers related to grinding and cutting is provided with a control heat exchange unit that controls cooling, cooling oil, and working fluid to an appropriate temperature, and cold air machining. Each of the machine groups is provided with the control heat exchange unit and a cold heat generation unit for generating cold air, a cold circulation system in which the heat exchange units are connected in parallel, and a cold heat source that supplies cold heat to the cold circulation system Thus, a cooling system is formed, and a rational cooling system is established by saving space and energy as a whole factory.
[0015]
Further, in the invention described in claim 2, the control heat exchanging portion described in claim 1 is constituted by an oil / brine heat exchanger, the cold heat generating portion for generating cold air is constituted by an air / brine heat exchanger, The machine is provided with a control heat exchange unit and a cold heat exchange unit, and a machining exchange machine is provided with a control exchange unit. The control heat exchange unit operates at a relatively low temperature by exhaust heat from the cold heat exchange unit. I have to do it. For this reason, cold heat is supplied from the cold heat circulation system through the cold heat exchanger, cold air is applied to the compressed air that is the air for generating cold air, and the exhaust heat is supplied to the control heat exchanger to lubricate, cool oil, and process The liquid agent can be controlled to be cooled to a relatively low temperature.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention unless otherwise specified. Absent.
FIG. 1 is a diagram showing a schematic configuration of a cooling system of a machining factory according to the present invention, FIG. 2 shows a cold air generating device around the cold air processing machine of FIG. It is a figure which shows the control heat exchange part which carries out cooling control of lubrication and cooling oil to appropriate temperature, and the circulation path of the lubricating oil and cooling oil from this heat exchange part.
[0018]
As shown in FIG. 1, the cooling system of the machining factory according to the present invention includes a cold air processing machine group 10a and a machining machine group 11a including an NC grinding machine, an NC cutting machine, an NC processing machine, a machining center, and the like. In the group of mechanical cold air processing machines, a cold brine production device 16 that is a cold heat source, cold brine circulation paths 15, 15a, 15b for supplying cold brine that is provided as a factory utility with the device to the load side, The generating air / brine heat exchangers 12, 12,... And the oil / brine heat exchangers 13, 13,.
As shown in FIG. 2, the cold brine is for cold air from the air pressure source 30 via the cold-air generating air / brine heat exchanger 12 built in the cold-air generator 20 of the cold-air processing machine 10. It is composed of low-temperature brine of about −35 ° C. sufficient to cool the compressed dry air to cold air 21 of about −30 ° C., and is loaded by the cold brine pump 17 from the cold brine production device 16 through the cold brine circulation paths 15 and 15a. Are supplied to the cold air processing machine group 10a and the machining machine group 11a (see FIG. 1).
[0019]
The air / brine heat exchanger 12 for generating cold air is supplied with a low temperature brine of about −35 ° C. from the circulation path 15, and the cold air 21 of about −30 ° C. is used as a contact point between the work 36 and the grindstone wheel 35 as described above. The desired cold air processing is performed while maintaining the surface of the sprayed workpiece at a temperature of about 7 ° C.
Further, the oil / brine heat exchanger 13 of the cold air processing machine 10 and the machine processing machine 11 circulates the supply of a relatively low temperature brine of about 6 to 8 ° C. whose temperature has been deprived of the cold by the air / brine heat exchanger 12. The lubricating oil and cooling oil are controlled to an appropriate temperature of about 10 ° C. so as to be received from the passage 15b, and are circulated through the oil tank 22 between the lubricating portion and the machine body as shown by the dotted lines, thereby holding the lubricating oil and the workpiece. The machine temperature can be maintained at an appropriate temperature to improve machining accuracy.
[0020]
In the case of cold air grinding, for example, when using cold air of −30 ° C., the surface temperature of the workpiece is about 7 ° C. Therefore, the lubricating oil temperature and the control target temperature of the cooling oil from the standpoint of maintaining machining accuracy are Since it is preferable to set a value close to the temperature of the workpiece, the brine supplied to the oil / brine heat exchanger 13 may use the brine that has been cooled by the air / brine heat exchanger 12, The cold brine at a low temperature of about −35 ° C. necessary for generating cold air is supplied from the cold brine circulation path 15 and a three-way mixing control valve is used for this to produce a brine temperature and cooling at a control temperature higher than the cold air temperature. You may enable it to cool oil and cutting oil.
[0021]
【The invention's effect】
With the above configuration, cold brine for cooling the cold wind generating air of the cold air processing machine group is supplied, and the machining machine group such as an NC machine tool and a machining center is lubricated, and the processing accuracy of the cooling oil and the processing liquid is maintained. Oil temperature control that controls cooling to an appropriate temperature can also be performed with cold brine, eliminating the clutter placed around the processing machine group as in the past, and space-saving and energy-saving environment-friendly machining Can provide factory cooling system.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a cooling system of a machining factory according to the present invention.
2 shows an apparatus for generating cold air around the cold air processing machine of FIG. 1, an oil / brine heat exchanger that shows the state of generation of cold air for processing by the apparatus, and that controls cooling and cooling of the lubricating and cooling oil to an appropriate temperature, and the heat exchanger. It is a figure which shows the circulation path of more lubricating oil and cooling oil.
FIG. 3 is a diagram showing an outline of a conventional cooling method for a group of machining machines.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Cold wind processing machine 10a Cold wind processing machine group 11 Machine processing machine 11a Machine processing machine group 12 Air / brine heat exchanger 13 Oil / brine heat exchanger 15, 15a, 15b Cold brine circulation path 16 Cold brine production apparatus 17 Cold brine pump 20 Cold air generator 22 Oil tank 30 Air pressure source 35 Wheel wheel 36 Workpiece

Claims (2)

In the machine cold air processing machine group consisting of a cold air processing machine group and a machining machine group in a machining factory,
A cooling heat circulation system including a control heat exchanging unit that cools and controls lubricating oil, cooling oil, and processing liquid to an appropriate temperature and a cold heat exchanging unit for generating cold air at the branch end to each machine cold air processing machine on the load side, and the circulation A cooling system for a machining factory, characterized by comprising a cold heat source for supplying cold heat to the system.   The control heat exchange part is composed of an oil / brine heat exchanger, the cold heat exchange part is composed of an air / brine heat exchanger, and the cold air processing machine is provided with a cold heat exchange part and a control heat exchange part, The machining plant according to claim 1, wherein a control heat exchange unit is provided for the processing machine, and the control heat exchange unit is operated at a relatively low temperature by exhaust heat of the cold heat exchange unit. Cooling system.

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