JPH03104535A - Cooling device for smoothing lubrication oil - Google Patents

Abstract

PURPOSE:To smooth a lubrication oil and to improve the working accuracy of the body to be worked by providing a control mechanism performing the control of the flow quantity adjusting means arranged in the circulation system passage of a lubrication oil base on each input signal of a machine side temperature, lubrication oil temperature, an air temperature, etc. CONSTITUTION:How to flow a circulation system pass 5 is decided by inputted each parameter of the temperature, air temperature, etc., of a machine itself as an input signal to a control mechanism 7 and inputted the temperature signal of the present lubrication oil temperature simultaneously. The lubrication oil 6 inside a tank 2 is then cooled by a cooler 3 which is operated at all times. This lubrication oil 6 is always circulated and alternated by the lubrication oil 6 in the receiver tank 1 returned from a machine tool 8 side. The temperature of the lubrication oil 6 in the receiver tank 1 is thus held at a specific value by adjusting the opening of a variable valve 10 and the number of rotations of a pump 12. Consequently, the lubrication oil 6 in a desired oil temperature is fed by a pump 13 and the temperature of a machine tool 8 can be held in constant.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention smoothes the temperature of lubricating oil in machines such as machine tools,
To stabilize the machining accuracy of the workpiece [Problem to be solved by the invention] When the cocooler 3a is turned on, the lubricating oil in the receiver tongue 1a is suddenly cooled, so the temperature on the machine tool 8a side suddenly drops. At this point, when the OFF signal is issued and the cooler 3a stops, a phenomenon occurs in which the temperature on the machine tool 8a side suddenly increases. In other words, on the machine tool 8a side, the cooler 3a is ON-OF.
The temperature changes in a wavy manner in accordance with F, and the oil temperature cannot be maintained at a smooth state. This causes a wave-like change in the workpiece being machined by the machine tool 8a, resulting in a problem of reduced machining accuracy. Another conventional technique for cooling lubricating oil is inverter control of a cooler. In this case, the rotational speed of the compressor is varied steplessly according to temperature changes in order to smooth out the oil temperature. However, there are problems with resonance phenomena and a large drop in efficiency when the compressor is operated at low speeds, and stepless speed change is practically impossible, resulting in something close to ON-OFF control.

The present invention solves the above-mentioned problems, and aims to provide a lubricating oil smoothing cooling device that can smooth the lubricating oil and improve the machining accuracy of a workpiece.

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention includes a receiver tank that temporarily stores a lubricant well for circulating and supplying lubricating oil to the machine tool side, and a lubricating oil that is constantly cooled by a cooler. A storage tank, a circulation path installed between the tank and the receiver tank to circulate the lubricating oil in both tanks, and a flow rate adjustment provided in the circulation path to adjust the flow rate of the circulating lubricating oil. means and
The lubricating oil smooth cooling device is provided with a control mechanism that controls the flow rate adjusting means based on various human input signals such as the machine side temperature, the lubricating oil temperature, and the air temperature.

[Operation] Appropriately cooled lubricating oil circulates between a tank that stores lubricating oil that is constantly cooled by a cooler and a receiver tank that communicates with the machine. The temperature of this circulating lubricating oil is controlled by a flow control means adjusted by a control mechanism, and is always maintained at a desired water temperature. Therefore, lubricating oil at a stable and appropriate temperature is always supplied to the machine.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is an overall configuration diagram of this embodiment. 1 is a receiver tank, 2 is a tank, 3 is a cooling device for tank 2, 4 is a flow rate adjustment means, 5 is a circulation system for lubricating oil 6, 7 is a control mechanism, and 8 is a machine tool. Each is shown below.

The lubricating oil 6 in the tank 2 is constantly cooled by the cooler 3.

The circulation system line 5 is composed of a closed loop piping 9 installed between the receiver tank 1 and the tank 2, and a continuously variable speed pump 12 for circulating the lubricating oil 6 in both tanks 1 and 2. .

The flow rate adjustment means 4 includes a variable valve 10 serving as a flow rate adjustment valve and its opening rA! 1, and an actuator 11 such as a motor. The variable valve 1o is disposed within the conduit 9. This is to adjust the flow rate of the lubricant well 6 flowing between both tanks 1.2. The dt amount adjusting means 4' is a continuously variable speed pump 1.
This is to control the rotation speed of No. 2 and adjust the flow rate.

The control mechanism 7 consists of something like a computer, and inputs temperature data such as lubricating oil temperature, machine side oil temperature, and air temperature, and controls the rotation of the pump 12 in order to maintain the lubricating oil temperature sent to the machine tool 8 side at a predetermined value. It determines the number of openings of the variable valve 10, determines the opening degree of the variable valve 10, and sends necessary command signals to the actuator 11 side.

Next, the operation of this embodiment will be explained in more detail.

In order to maintain the machine tool 8 at an appropriate temperature, parameters such as the temperature of the machine itself and air temperature are input to the control mechanism 7 as input signals, and at the same time a temperature signal of the current lubricating oil temperature is input, thereby controlling the circulation system. It is decided how to set the flow rate in step 5. The lubricating oil 6 in the tank 2 is cooled by a cooler 3 which is constantly operated, and the lubricating oil 6 is constantly circulated through the lubricating well 6 in the receiver tank 1 and the pipe 9 which are returned from the machine tool 8 side. Therefore, the opening degree of the variable valve 10,
By adjusting the rotation speed of the pump 12, the temperature of the lubricating oil 6 in the receiver tank 1 can be maintained at a predetermined value. To explain in more detail, the lubricating oil 6 at a desired lubricant temperature is sent to the machine tool 8 by the pump 13 through closed-loop grow loop control of adjusting the flow rate of the circulation path 5 based on human input signals to the control mechanism 7 and future commands. It turns out. As a result, the temperature of the machine tool 8 is maintained at a constant temperature.

This embodiment differs from the prior art in that the cooler 3 is ON-
OFF control is not performed, the smoothed high lubricant oil 6 is constantly supplied, and the temperature on the machine tool 8 side is stabilized as described above, so thermal changes in the machine tool 8 can be suppressed to a low level, and the workpiece It becomes possible to improve the machining accuracy.

Although the case of the machine tool 8 has been described in this embodiment, the present invention is not limited to this.

[Effects of the Invention] As is clear from the above description, according to the present invention, the temperature of the lubricating oil is smoothed, the temperature of the machine side is always maintained at a stable temperature, and the machine precision can be stably maintained.

[Brief explanation of drawings]

FIG. i is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a configuration diagram of a conventional lubricating oil cooling device. DESCRIPTION OF SYMBOLS 1... Receiver tank, 2... Tank, 3... Cooler, 4, 4'... Flow rate adjustment means, 5... Circulation system path, 6... Lubricating oil, 7... Control Mechanism, 8...Machine tool, 9...Pipe line, IO...Variable valve, 11...
・Actuator, 12...Continuously variable speed pump, 13・
··pump.

Claims (1)

[Claims] A receiver tank that temporarily stores lubricating oil to circulately supply lubricating oil to the machine side, a tank that stores lubricating oil that is constantly cooled by a cooler, and a tank that is installed between the tank and the receiver tank and that stores the lubricating oil in both tanks. A circulation system path for circulating lubricating oil, a flow rate adjustment means arranged in the circulation system path for adjusting the flow rate of the circulating lubricating oil, and a system based on input signals such as machine side temperature, lubricating oil temperature, and air temperature. A smooth cooling device for lubricating oil, comprising: a control mechanism that controls the flow rate adjusting means.