JP2003220540A - Feeding apparatus for very small amount of cutting oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeding apparatus for a very small amount of cutting oil which overcomes the problem of not functioning as spray as cutting oil can not be updrawn because a venturi portion does not pressure when flow rate is very small as in conventional 'MQL' using venturi effect in an apparatus feeding a very small amount of jet flow including a very small amount of cutting oil to only a vicinity of a cutting working point. <P>SOLUTION: In the feeding apparatus for a very small amount of cutting oil according to the invention, an ultrasonic oscillator is provided at the bottom portion of the hermetically sealed container filled with the cutting oil, and an air feeding unit and a mixed gas feeding unit feeding a mixed gas of the cutting oil atomized by the ultrasonic oscillator within the hermetically sealed container and the fed air to a cutting working portion are connected to the upper portion of the hermetically sealed container. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting oil supply device, and more particularly, to a method for spraying a very small amount of cutting oil to a processing portion during mechanical cutting. The present invention relates to a device for supplying a very small amount of cutting oil. [0002] The use of cutting oil in cutting machining reduces the cutting resistance, prevents fusion of the work material to the tool, reduces tool wear and prevents tool breakage. Is effective in However, the cutting oil uses an extreme pressure additive containing chlorine, sulfur, phosphorus, etc. in order to enhance the lubricating performance, and has a bad influence on the environment. In machine tools that use cutting oil, the supply of cutting oil accounts for a significant part of the total energy consumption.
The cost of the cutting oil supply device and the cost of waste oil treatment are also considerable. For this reason, a method in which the required minimum amount of cutting oil is formed into a mist and blown to a processing point together with air has been widely used. As a conventional device for supplying a small amount of cutting oil, there is a device called “Minimum Quantity Lubrication (generally referred to as“ MQL ”)”, which is described in, for example, Japanese Patent Application Laid-Open No. 2001-162487. JP, JP-2000-126983-A and JP-A-10-296582, as described in JP-A-10-296582, the cutting oil is atomized using the ejector effect, large oil droplets are dropped by gravity, and then float. In this method, only oil droplets having a small particle diameter are put in a high-speed airflow that is sprayed on a cutting surface, and are ejected, or the cutting oil is sprayed into a mist using the ejector effect. [0003] On the other hand, in recent years, there has been an increasing demand for very fine precision cutting using a very small tool, and accordingly the processing machine itself has been miniaturized. Have been. However, the conventional "MQL"
This technique cannot be applied to spraying where the flow rate of a gas mixture of cutting oil and air is very small, which is required for very fine precision cutting. Because, "MQ
In the case of "L", when the flow rate of the mixed gas is very small, the venturi portion does not have a low pressure, so that the cutting oil cannot be sucked up and does not function as a spray. Even if the cutting oil is forcibly supplied to the venturi, there is a problem that the pressure drop in the venturi cannot be sufficiently increased, and the cutting oil flows out of the container as droplets without becoming mist. Was. "Machine technology" (Vol. 47, No. 5, page 46) includes "MQ having an outlet air flow rate of 50 to 260 L / min."
L "is introduced. According to the present invention, a very small cutting oil is atomized by ultrasonic vibration in an airtight container, and the atomized cutting oil and air are ejected from a nozzle by applying air pressure to the airtight container to thereby produce a very small oil. It is an object of the present invention to provide a supply device for a small amount of cutting oil which can supply an air jet containing a very small amount of cutting oil mist even at a gas flow rate. [0005] In order to achieve the above object, an apparatus for supplying a very small amount of cutting oil according to the present invention is provided with an ultrasonic oscillator at the bottom of a closed vessel filled with cutting oil, The air supply means and the mixed gas supply means for supplying the gas mixture of the supplied air and the cutting oil atomized by the ultrasonic oscillator in the closed vessel to the cutting section are connected to the upper part of the closed vessel. Features. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing an example of a device for supplying a trace amount of cutting oil. The closed container 1 is configured by covering the bottomed cylindrical body 2 with the lid 3. An ultrasonic oscillator 4 including a piezoelectric vibrator 5 and the like is mounted on the bottom of the sealed container 1, and the ultrasonic oscillator 4 is connected to a drive circuit 6. Further, the closed container 1 is filled with an appropriate amount of the cutting oil 7 (for example, about 20% of the volume of the closed container), and a part of the cutting oil 7 is atomized by operating the ultrasonic oscillator 4. Thus, the upper portion of the closed container 1 is filled with the oil particles 8. On the other hand, on one side of the lid 3 of the closed container 1, a blower tube 10 connected to a blower pump 9 is connected so that air can be sent into the closed container 1. A flexible supply pipe 11 for supplying a mixed gas of the oil particles 8 and air is connected to the other side of the lid 3 of the closed container 1. One end of the supply pipe 11 is provided with a nozzle 12. Is provided. The diameter of the nozzle 12 is, for example, 0.5 to 0.8 mm. In the middle of the supply pipe 11, a branch pipe 13 connected to the bottom of the closed vessel 1 is provided. The branch pipe 13 is provided by branching the supply pipe 11 from a downward curved portion so that large oil droplets contained in the gas mixture fed from the closed vessel 1 are separated and returned to the closed vessel 1. . Branch pipe 1
It is convenient to provide an oil level gauge 14 for detecting the filling amount of the cutting oil in the closed vessel 1 at a predetermined position in the middle of 3. The drive circuit 6 and the blower pump 9 are controlled by the controller 15. [0008] Such a cutting oil supply device is used, for example, as follows. First, the control device 15 operates the ultrasonic oscillator 4 to atomize the cutting oil 7. Next, when the air supply pump 9 is driven to pressurize the inside of the closed container 1, the pressurized gas mixture is blown from the nozzle 12 to the cutting portion. At this time, oil droplets having a large diameter out of the atomized cutting oil fall downward from the branch pipe 13 to form a closed container 1.
And only small diameter oil droplets are selectively supplied to the cutting location. Therefore, the diameter of the supplied oil droplets is relatively uniform, and the oil droplets are dispersed and jetted at a substantially uniform concentration in the cutting portion. Therefore, the cutting lubrication effect can be effectively enhanced by using a very small amount of cutting oil without waste. When the air flow rate at the outlet of the nozzle in the apparatus for supplying a trace amount of cutting oil according to this embodiment was measured,
It was 320 mL / min. This value is 1/150 or less as compared with the above-mentioned conventional “MQL”. As described above, according to the present invention, a jet with a very small flow rate containing a very small amount of cutting oil can be supplied only to the vicinity of the cutting point. In particular, since the venturi effect is not used unlike the conventional "MQL", the device can be simplified and downsized, and the amount of air used can be greatly reduced. It is possible to provide an apparatus for supplying a very small amount of cutting oil.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an example of a micro-cutting oil supply device according to an embodiment of the present invention. [Description of Signs] 1 Closed vessel 2 Bottomed cylindrical body 3 Lid 4 Ultrasonic oscillator 5 Piezoelectric vibrator 6 Drive circuit 7 Cutting oil 8 Oil particles 9 Ventilation pump 10 Ventilation pipe 11 Supply pipe 12 Nozzle 13 Branch pipe 14 Oil level Gauge 15 controller

Claims (1)

Claims: 1. An ultrasonic oscillator is provided at the bottom of a closed container filled with cutting oil, and air is supplied to an upper portion of the closed container and atomized by the ultrasonic oscillator in the closed container. A mixed gas supply means for supplying a mixed gas of the supplied cutting oil and the supplied air to the cutting section, respectively;