JPH11309642A - Cutting method and cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the used amount of the cutting oil while efficiently eliminating the chips so as to improve the effect of injection of the oil mist by performing a process for spraying the gas to a cutting tool so as to eliminate the chips adhered to the cutting tool with the predetermined timing. SOLUTION: When the predetermined quantity of the chips is adhered to a cutting tool 12, the signal for opening a solenoid valve 46 for the predetermined time is output from a timer 44 to the solenoid valve 46. With this structure, in an air injecting device 30, the compressed air stored in an accumulator tank 34 is injected by a compressor 32 from an injection nozzle 42 to the cutting tool 12 for the predetermined time so as to eliminate the chips adhered to the cutting tool 12. In this case, injection of the oil mist can be stopped during the injection of the air. Pressure of the accumulator tank 34 is returned to the predetermined value by the operation of the compressor 32 during the time when the solenoid valve 46 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus suitable for cutting a cavity of a mold, for example.

[0002]

2. Description of the Related Art Conventionally, when cutting a cavity of a mold with a machine tool or the like, a considerably large amount of oil is applied to a cutting tool being cut to cool the cutting tool and lubricate the cutting surface of the tool. At the same time, fine chips were poured out by viscous force of oil. However, in this method, the cutting edge was incompletely removed and the cutting edge was damaged, and the finished state of the cut surface was not good.

[0003] In addition, there is a demand in the world to produce as little garbage as possible, and various efforts have been made at production plants to achieve a so-called zero-emission plant that produces no waste. Efforts are also being made to reduce waste. Therefore, a technique of spraying oil as extremely fine particles (oil mist) and spraying it to the tip of a cutting tool being cut has been developed and started to be put into practical use.

[0004]

However, when the workpiece is cut while spraying the oil mist toward the cutting tool, a very good cut surface can be obtained at first, but the chips are gradually removed. The oil sticks to and accumulates on the cutting tool, and no new oil mist is applied to the cutting tool. As a result, the cooling of the cutting tool and the lubrication of the cutting surface of the cutting tool become insufficient, and chipping occurs, shortening the life of the cutting tool,
As a result, the cutting surface also deteriorated.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a cutting method and a cutting method which can effectively remove chips and obtain the effect of spraying oil mist, thereby reducing the amount of cutting oil used. It is intended to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a cutting method for cutting a workpiece while supplying an oil mist to the cutting tool by the cutting tool. A cutting method characterized in that a step of spraying a gas to remove chips attached to the cutting tool is performed at a predetermined timing.

[0007] It takes a certain amount of time for the chips to adhere to and accumulate on the cutting tool and prevent the oil mist from reaching the cutting tool.
Blowing compressed air toward the cutting tool at a predetermined timing, without substantially obstructing the oil mist spray itself
Chips adhering to the cutting tool can be removed.

According to a second aspect of the present invention, there is provided a cutting tool, an oil mist sprayer for supplying an oil mist to the cutting tool, and a cutting tool attached to the cutting tool by blowing gas toward the cutting tool. A cutting apparatus comprising: a gas injection unit that removes powder; and a control unit that operates the gas injection unit at a predetermined timing.

According to a third aspect of the present invention, the gas injection unit is provided in a compressor for discharging compressed air, a storage pressure tank for storing compressed gas from the compressor, and a gas pipe extending from the storage pressure tank. The cutting device according to claim 2, further comprising a spray nozzle provided. Thus, with a simple structure, gas at a constant pressure can be supplied stably to efficiently remove chips.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a cutting apparatus, in which a cutting tool 12 for cutting a workpiece 10 such as a die, an oil mist spraying apparatus 20 for spraying an oil mist toward the cutting tool, and a cutting tool. An air injection device 30 that intermittently injects compressed air toward the tool 12 is provided. In this example, the cutting tool 12 is attached to an NC processing device (not shown) that controls a processing position and an amount according to a program input in advance.

The oil mist spraying device 20 includes an oil source (not shown) and an oil source extending from a compressed air source (not shown).
A spray nozzle 24 is provided at the tip of the compressed air pipe 22, and the spray mist of the spray nozzle 24 sprays oil mist toward the cutting tool 12. The spray nozzle 24 is attached to the spindle head of the NC processing device that holds the cutting tool, and is linked to the cutting tool and is always directed to the cutting tool.

The air injection device 30 includes a compressor (compressed air source) 32 for discharging compressed air and a storage pressure tank 34 for storing compressed air from the compressor 32 through a throttle valve 36 to supply air piping 38. An injection nozzle 42 is provided at the tip of a discharge-side air pipe 40 extending from the storage pressure tank 34. An electromagnetic on-off valve 46, which is controlled to open and close by a timer 44, is provided in the middle of the discharge-side air pipe 40. The timer 44 outputs a signal to the electromagnetic on-off valve 46 to open the on-off valve for a predetermined time every time when a predetermined amount of chips accumulates around the cutting tool. The injection nozzle 42 is also used for the cutting tool 12.
Is attached to the spindle head of the NC machining apparatus that holds the cutting tool, and interlocks with the cutting tool.

The spray nozzle 24 and the spray nozzle 42
How to attach is appropriate, even if it is fixed in an appropriate place,
Alternatively, a drive mechanism that works in conjunction with the control mechanism of the NC device may be provided. Further, a dust removing device for absorbing and removing mist and chips may be provided near the cutting tool 12.

Next, the operation of the cutting apparatus configured as described above will be described. The NC machining apparatus drives the cutting tool 12 in accordance with a program input in advance, or performs, for example, machining of a cavity in the mold 10 while relatively moving the cutting tool 12 and the mold 10 of a workpiece. At this time,
A predetermined amount of oil mist is sprayed from the spray nozzle 24 of the oil mist spraying device 20 toward the cutting tool 12 to cool and lubricate the cutting tool 12.

When a predetermined amount of chips has adhered to the cutting tool 12 after a predetermined time has elapsed, a signal is output from the timer 44 to the electromagnetic on-off valve 46 to open the electromagnetic opening valve 46 for a predetermined time. Thereby, the compressed air stored in the storage tank 34 by the compressor 32 in the air injection device 30 is injected from the injection nozzle 42 toward the cutting tool 12 for a predetermined time, and thereby, the chips adhered to the cutting tool 12 are removed. Remove. In this case, the injection of the oil mist may be stopped while the air is being injected. Solenoid on-off valve 4
While the valve 6 is closed, the pressure of the storage pressure tank 34 is returned to a predetermined value by the operation of the compressor 32.

In the above, the conditions such as the opening / closing time pitch of the on-off valve 46 and the pressure of the blast air may be measured in advance by a test machining for each predetermined machining. In an experiment conducted by the inventors, when a die 10 made of SKD 11 was machined using an end mill having a diameter of 29 mm as the cutting tool 12,
Air injection was performed at 10 minute intervals for 2 seconds, and the injection pressure was 3-5.
Good results were obtained when performed at kgf / cm ² .

As described above, by injecting the compressed air for a short time at a predetermined timing, the chips are instantaneously removed from the cutting tool 12 without substantially hindering the spray of the oil mist, and the oil mist is cut. The cutting can be continued by reliably reaching the tool 12.

In the embodiment, the on-off valve 46
An example is shown in which a timer 44 is used as the opening / closing means. However, the opening / closing valve 46 and the throttle valve 36 are directly controlled by the drive / control device of the NC machine tool so as to automatically follow changes in cutting conditions. You can also.

[0019]

As described above, according to the present invention,
By estimating the time for the chips to adhere to the cutting tool, by blowing compressed air toward the cutting tool at a predetermined timing, the chips adhered to the cutting tool are removed without substantially hindering the oil mist spray itself. be able to. Therefore, instead of the conventional process of flowing a large amount of oil, smooth and high-quality cutting can be performed using an oil mist, thereby reducing the amount of cutting oil and promoting zero emission. it can.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an outline of a cutting apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Cutting tool 20 Oil mist spraying device 24 Spray nozzle 30 Intermittent compressed air injection device 32 Compressor (compressed air supply source) 34 Storing pressure tank 36 Throttle valve 38, 40 Air piping 42 Injection nozzle 44 Timer (opening / closing means) 46 On-off valve

Claims (3)

[Claims] 1. A cutting method for cutting a workpiece while supplying an oil mist to the cutting tool by the cutting tool, wherein a gas adhered to the cutting tool is blown by blowing gas toward the cutting tool. A cutting method wherein the step of removing is performed at a predetermined timing. 2. A cutting tool, an oil mist spraying section for supplying an oil mist to the cutting tool, and a gas jetting section for blowing gas toward the cutting tool to remove chips attached to the cutting tool. And a control unit for operating the gas injection unit at a predetermined timing. 3. The gas injection section has a compressor that discharges compressed air, a storage tank that stores compressed air from the compressor, and an injection nozzle that is provided in an air pipe extending from the storage tank. The cutting device according to claim 2, wherein: