JPH0419741Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is for electrically connecting the motor connector provided in the tool and the receiving connector provided on the machine tool side in a tool with a built-in motor. The present invention relates to a connector device.

(Prior art and its problems) In a machine tool equipped with an automatic tool changer,
When a tool with a built-in electric motor is automatically attached to the spindle of the machine tool body, a connector is attached to the tool side and the spindle respectively, and the connector is inserted at the same time as the tool is attached, and the tool's electric motor is activated. It should be electrically driven and controlled. In this case, if a tool other than the above-mentioned tool is attached to the spindle and machining is being carried out, chips and cutting oil from this will adhere to the connector on the spindle side, so when attaching the above-mentioned tool to the spindle, This had the disadvantage that chips attached to the connectors could get caught between the connectors, resulting in poor contact or damage to the connectors.

(Means for Solving the Problems) In view of the above-mentioned circumstances, the present invention is designed to prevent the connectors from coming into contact with each other even if chips or dust are attached to the motor built-in tool side connector or the machine tool side receiving connector. The purpose of this invention is to provide a connector device for a tool with a built-in electric motor that can brush off chips and dirt from these chips and prevent poor contact and damage. 2
If shown with the reference numeral shown in the figure, it is removably attached to the machine tool and has a rotary blade drive electric motor 9 inside.
In the motor built-in tool 4a, the motor connector 11 has one or more pin-shaped male electrodes 11a, which is connected to the machine tool side receiving connector 12 when installed. The machine tool side receiving connector 12 has a fitting hole 12c that communicates with the air pressure source 16 via the solenoid valve 15, and a fitting hole 12c that is provided in the fitting hole and can be attached to and detached from the pin-shaped male electrode 11a. It is characterized by being provided with a ring-shaped female electrode 12a that is connected to the insertion hole and penetrates between the inside and the outside of the insertion hole.

(Function) Immediately before the built-in motor tool 4a is mounted on a machine tool, the solenoid valve 15 is opened, and compressed air from the air pressure source 16 is introduced into the fitting hole 12c of the machine tool side receiving connector 12, and the compressed air is introduced into the fitting hole 12c of the machine tool side receiving connector 12. Compressed air blows against the inner peripheral surface of the ring-shaped female electrode 12a provided at the ring-shaped female electrode 12c and the surface of the pin-shaped male electrode 11a immediately before being attached to the female electrode.
It passes through 2a and is released to the outside.

(Example) In FIG. 1, a numerically controlled machine tool 1 includes a machine tool main body 3 having a main spindle 2, a large number of tools 4a, 4
The automatic tool changer 4 includes a numerical control device 5 that controls these devices using machining commands, tool change commands, etc. A tool 4a is attached to the main spindle 2 by a manipulator (not shown) of an automatic tool changer 4, and a minute diameter hole is drilled in the work W by a minute diameter drill 6 attached to the tip of the tool 4a. I am trying to do. The tool 4a is provided with a taper shank part 7 and a gripping part 8 by a manipulator, has a built-in high-frequency electric motor 9 that can coaxially rotate at high speed, and has the aforementioned drill blade 6 attached to the tip of the chuck part 10. . At a position offset from the axis of the tool 4a,
A connector 11 for connecting to the high frequency electric motor 9 is provided, and the tool 4a is connected to the receiving connector 12 provided on the machine tool main body 3 at the same time as the tool 4a is mounted on the main shaft 2.

Referring also to FIG. 2, the receiving connector 12 has a fitting hole 12c opening downward and a ring electrode 1.
2a, and a flow path 12b for blowing air out from the ring electrode 12a. A tube 14, an electromagnetic shut-off valve 15, and an air pressure source 16 are connected to this flow path 12b via a connector 13. ing. This occurs immediately before the tool 4a is attached to the spindle 2, that is, when the pin electrode 1 of the connector 11
1a is inserted into the ring electrode 12a, the electromagnetic on-off valve 15 is turned on for a short time and air is blown out from the ring electrode 12a, thereby purging chips, dirt, oil, etc., and establishing an electrical connection. This is to ensure that

Referring also to FIG. 3, the output of a controller 17 for receiving control signals from the numerical control device 5 to control and drive the high frequency electric motor 9 is connected to the receiving connector 12. Controller 17
is an interface section 1 consisting of a photocoupler for inputting control signals from the numerical control device 5;
8. IO section 19, signal output section 20 consisting of a relay etc. that outputs an ACK signal to the numerical control device 5, central processing section 21 consisting of a microprocessor etc., memory sections 22, 23, IO section 24, decoding digital signals. A DF converter 25 outputs a sine wave signal of a specified frequency, and a divider 2 generates a three-phase alternating current based on the output from the DF converter 25.
6. A drive section 27 that amplifies the power of the output from the divider section 26 to drive the high-frequency motor 9; a drive section 2 consisting of the divider section 26 and the drive section 27;
8. It consists of a decoder section 29 and a display section 30 for displaying the number of revolutions.

The numerical control device 5 reads commands from a programmed paper tape, for example, and controls the machine tool main body 3 and the automatic tool changer 4 according to the contents, or outputs a control signal to the controller 17. For example, the operation of the program shown in FIG. 4 will be explained. When the numerical control device 5 reads "50" from the paper tape, a BCD signal and an INH signal corresponding to "50" are output, and the controller 17 reads "50" at the timing when the REQ signal is on. The central processing unit 21 decodes “50” and puts the controller 17 into an operating state, makes subsequent commands valid and previous commands invalid, and outputs an ACK signal from the signal output unit 20. next,
When "60" is read, it is recognized that this is a command to set the rotation speed, and the rotation speed corresponding to "60" (for example, 35000 rpm) is read out from the rotation speed table stored in advance in the memory 22 and displayed. "35" is displayed in section 30. When "53" is read, it recognizes this as a command to start normal rotation, and DF
The converting section 25 and the driving section 28 are activated, and the high frequency electric motor 9 begins to rotate at the set rotation speed of 35,000 rpm. After that, the workpiece W is given a command to the machine tool main body 3.
Alternatively, the main shaft 2 moves and the drill blade 6 drills a hole at a predetermined position in the workpiece W. and,
When "M55" is read, the high frequency electric motor 9 stops,
Furthermore, by reading "M51", the controller 17 enters a standby state. During this time, the main shaft 2 is stopped without rotating, and the high frequency electric motor 9
Machining is performed by high-speed rotation. When machining with the tool 4a is completed, the automatic tool changer 4 receives a tool change command and replaces the tool 4a with the next tool.

According to the above-described embodiment, the hole in the workpiece W is machined by the rotation of the high-frequency electric motor 9, not by the rotation of the main spindle 2, so that the hole can be machined by high-speed rotation, which is impossible for the main spindle 2 to rotate. The machining speed is fast, vibrations due to rotation of the spindle 2 are not generated, machining accuracy is improved, the spindle 2 is not damaged, the life of the spindle 2 is extended, and power consumption can be saved. The tool 4a with a built-in high-frequency electric motor 9 can be replaced in the same way as other tools 4b, 4c, etc. by the tool changer 4, and can also be used to receive commands such as setting the rotational speed and starting/stopping the high-frequency electric motor 9 numerically. Control device 5
It can be operated freely using control signals from the machine, and fully automatic operation is possible. Since the M signal is used, it is easy to create a program and read it by the numerical control device 5, and it is also possible to control the tool 4a by simply preparing the controller 17 without making any changes to the numerical control device 5. It is. Since the rotational speed is set by reading from the rotational speed table stored in advance in the memory 22, there is little possibility that the rotational speed will become abnormally high or low due to a program error. If such a rotation speed table is created according to the material of the workpiece W and the specifications of the tool 4a used, programming becomes easier and the optimum rotation speed for machining can be easily set. be exposed. Since air is blown out from the receiving connector 11 before the connector 11 is inserted, the adhesion of chips and dust is eliminated, the connection is ensured, and poor contact and damage to the connector 11 or the receiving connector 12 are prevented.

In the embodiments described above, the format and content of the control signal from the numerical control device 5 to the controller 17 may be different. In setting the rotation speed, the rotation speed table in the memory 22 is used, but it is also possible to set the rotation speed in advance using a plurality of digital switches or variable resistors, and select the set value using a control signal. You can also do this. Furthermore, the rotation speed may be directly set by a program using a macro IO signal or the like instead of the M signal. At this time, for example
By setting in units of 1000 rpm, the number of program commands and control signal lines is reduced. If, for example, a DC motor is used instead of the high-frequency motor 9, a corresponding drive unit 28
, and a DA converter or the like may be used in place of the DF converter 25. Although the controller 17 uses the central processing section 21 consisting of a microprocessor, it can also be constructed from hard logic instead.

In the above embodiment, the pin electrode 11a of the connector 11 and the ring electrode 1 of the receiving connector 12
The shape and number of poles of 2a may be arbitrary. The cover part 11b may be omitted, and the receiving connector 12
It may be placed on the side. The electromagnetic on-off valve 15 may be opened and closed several times, for example, before the pin electrode 11a is inserted into the ring electrode 12a. is adjusted in two stages, and while the pin electrode 11a is not inserted, a small flow of air is allowed to flow to prevent dust from entering the receiving connector 12, and immediately before the pin electrode 11a is inserted, a large flow of air is allowed to flow. The air may be circulated to perform a reliable air purge, and the air may be stopped after the pin electrode 11a is inserted.

(Effect of the invention) When installing a tool with a built-in electric motor on a machine tool,
Compressed air is blown directly onto the male electrode of the tool-side connector and the female electrode of the machine tool-side receiving connector, making it possible to brush off chips and dirt adhering to these electrodes. It is possible to reliably prevent poor contact and damage even in machine tool work sites where chips and the like are likely to be generated.

Therefore, in machine tools equipped with automatic tool changers,
Tools with a built-in electric motor can be replaced automatically and stably.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a diagram schematically showing a numerically controlled machine tool, FIG. 2 is an enlarged sectional view of the connector, and FIG. 3 is a block circuit diagram of the controller. FIG. 4 is a diagram showing an example of a program. 9... Electric motor for driving rotary blade, 11... Connector for motor, 11a... Pin-shaped male electrode, 12...
Machine tool side connector, 12a... Ring-shaped female electrode, 12c... Fitting hole, 15... Solenoid valve, 16...
...Air pressure source.

Claims (1)

[Scope of utility model registration request] In a motor built-in tool that is removably attached to a machine tool and has a built-in electric motor for driving a rotary blade, and is also equipped with a motor connector that is connected to the machine tool side receiving connector when attached, the motor connector is One or more pin-shaped male electrodes are provided protrudingly, and the machine tool side receiving connector has a fitting hole that communicates with an air pressure source via a solenoid valve, and a pin-shaped male electrode provided in the fitting hole. A connector device for a tool with a built-in motor, which is provided with a ring-shaped female electrode that is removably connected to a ring-shaped male electrode and penetrates between the inside and outside of a fitting hole.