JPH065851U - Rotating tool contact confirmation device - Google Patents

Abstract

(57) [Summary] [Purpose] In machine tools such as turning centers and machining centers, it is possible to confirm that a rotating tool is correctly and closely attached to a spindle. [Arrangement] An air outlet 20b is provided on a tool positioning surface 9a in a rotary tool mounting hole 9 of a spindle 8. Air supply path 2 for sending compressed air to the air outlet 20b
0, 21, and 27 are provided, and a contact detection sensor 22 that detects back pressure is provided in this path. A pressure switch, a gap sensor, or the like is used as the contact detection sensor 22. The housing 14 that supports the spindle 8 is provided with a flow path coupling 15 that comes into contact with and separates from the surface of the spindle 8 on which the air inlet 20a is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary tool contact confirmation device for a cutting machine using a rotary tool such as a turning center or a machining center.

[0002]

[Prior art]

 Turning centers and machining centers are equipped with an automatic tool changer, and the rotary tool installed in the rotary tool mounting hole of the spindle is automatically changed according to the machining type.

[0003]

[Problems to be solved by the device]

 However, there is no means to confirm whether the replaced rotary tool is properly mounted in the rotary tool mounting hole of the spindle, and there is a possibility that defective products will be produced in the case of poor mounting. In the case of a fixed tool such as a turning tool on a lathe, it is easy to provide a confirmation means because it is fixed to the tool rest, and various confirmation means have been conventionally provided. However, in the case of a rotary tool, it is difficult to provide confirmation means because it is attached to the spindle, and development of confirmation means is awaited.

An object of the present invention is to provide a rotary tool contact confirmation device capable of confirming that a rotary tool is correctly mounted in a close contact state on a spindle.

[0005]

[Means for Solving the Problems]

 The rotary tool contact confirmation device of the present invention has an air outlet on the tool positioning surface in the rotary tool mounting hole of the spindle, and detects back pressure in the air supply path that sends compressed air to this air outlet to confirm the close contact. It is provided with a contact detection sensor for performing. The aforementioned air supply path is a path for sending compressed air from the housing supporting the spindle to the air outlet.

[0006]

[Action]

 When the rotary tool is properly installed in the rotary tool mounting hole of the spindle, the rotary tool will be in close contact with the tool positioning surface of the rotary tool mounting hole. Due to this close contact, the pressure of the compressed air sent from the air supply path to the air outlet on the tool positioning surface, that is, the back pressure at the air outlet rises above a predetermined value, and the close contact detection sensor detects this. The close contact of the rotating tool is automatically confirmed. If the rotary tool is not properly attached, air leaks from the air outlet, and the back pressure does not rise to a specified value.

[0007]

【Example】

 An embodiment of this invention will be described with reference to FIGS. FIG. 2 is a perspective view of a turning center equipped with the rotary tool contact confirmation device of this embodiment. This turning center includes a fixed-position main spindle 1, a sub-spindle 2 facing the main spindle 1 and movable in two axial directions (X-axis and Z-axis), a turret 3, a milling head 4, and a tool changing device. 5 and the rotary tool contact confirmation device of the present invention is applied to the milling head 4. The work held on the main spindle 1 can be processed by any of the tools of the turret 3 and the milling head 4, and can also be held by the sub spindle 2 for processing. The tool exchanging device 5 is for exchanging the tool of the milling head 4 with an arbitrary tool of the tool magazine 7 by an exchanging arm 6.

FIG. 1 is a partial vertical sectional view of the milling head 4. The spindle 8 of the milling head 4 has a tapered rotary tool mounting hole 9 at the shaft end, and a tool positioning surface 9a for receiving the collar portion 10a of the rotary tool 10 is formed around the opening of the hole 9. The rotary tool 10 is mounted in a state in which the pull bolt 10b at the rear portion is engaged with the draw bar 11 that is operated to move back and forth within the spindle 8 and is pulled in, and the collar portion 10a is in close contact with the tool positioning surface 9a. An air outlet 20b for contact confirmation is opened on the tool positioning surface 9a, and an air supply passage 20 in the spindle is provided which opens from the outer peripheral surface of the spindle 8 to the air outlet 20b.

The spindle 8 is rotatably supported by the milling head housing 14 via bearings 12 and 13, and is rotatably driven by a motor (not shown) at the rear part. The in-spindle air supply path 20 communicates with the external air supply path 27 through the coupling 15 provided in the housing 14 and the housing air supply path 21, and is connected to the air source 24. The coupling 15 includes a cylindrical piston 17 that is provided in the cylinder 16 so as to be able to move back and forth, and a spring 19 that urges the cylindrical piston 17 toward the stopper 18 side of the cylinder 16. One end of the cylindrical piston 17 is opposed to the back surface of the collar portion of the spacer 8a provided on the outer periphery of the spindle 8, and the stopper 18 side portion of the cylinder 16 is communicated with the housing air supply passage 21. .

An air inlet 20 a is opened at a position corresponding to the cylindrical piston 17 on the back surface of the spacer 8 a and communicated with the in-spindle air supply path 20. The external air supply path 27 is provided with a contact detection sensor 22 including a gap sensor or a pressure switch, and an opening / closing valve 25 and an air pressure filter 23 are interposed.

The operation of the above configuration will be described. While the spindle 8 is rotating, the on-off valve 25 is closed to stop the supply of compressed air from the air source 24. As a result, the cylindrical piston 17 in the coupling 15 is pressed against the stopper 18 side by the urging force of the spring 19, and a gap is formed between the cylindrical piston 17 and the rear surface of the flange portion of the spacer 8a attached to the spindle 8. Is maintained. Therefore, the cylindrical piston 17 is prevented from interfering with the rotation of the spindle 8.

At the time of tool replacement, the on-off valve 25 is opened to supply air after the replacement is completed. However, the rotational position of the spindle 8 is indexed so that the air inlet 20a of the spacer 8a faces the cylindrical piston 17 of the coupling 15. By supplying air in this way, the cylindrical piston 17 moves forward against the spring 19 by the air pressure in the cylinder 16 and is pressed against the back surface of the spacer 8a of the spindle 8. Therefore, the compressed air is supplied from the in-spindle air supply path 20 to the air outlet port 20b through the cylindrical piston 17. If the rotary tool 10 is properly mounted, the collar portion 10a comes into close contact with the tool positioning surface 9a and closes the air outlet 20b, so that the back pressure at the air outlet 20b rises to the set pressure of the contact detection sensor 22. Therefore, the contact detection sensor 22 is turned on, and it is confirmed that the contact detection sensor 22 is in the contact state.

When the rotary tool 10 is not completely attached, the flange a does not come into close contact with the tool positioning surface 9a, and compressed air leaks from the air outlet 20b. Therefore, the back pressure does not rise to the set pressure, and the contact detection sensor 22 does not turn on. From this result, it is judged that the mounting of the rotary tool 10 is incomplete. If the contact detection sensor 22 does not turn on at a predetermined time, an alarm is generated to notify the operator and the machining operation is stopped.

When a gap sensor is used as the contact detection sensor 22, for example, 0. Set to turn off at a gap of 05 mm or more. As a result, when the gap between the rotary tool 10 and the positioning surface 9a is 0.05 or more, the switch does not turn on, but an alarm occurs, and when the gap is 0.05 or less, the switch is turned on and close contact is confirmed.

[0015]

[Effect of device]

 The rotary tool contact confirmation device of this invention is provided with an air outlet on the tool positioning surface in the rotary tool mounting hole of the spindle, and the back pressure of the air outlet is provided in the air supply path for sending the compressed air to the air outlet. Since the close contact detection sensor is provided to detect and check the close contact, it is possible to confirm that the rotating tool has made proper contact with the spindle, and it is possible to prevent the occurrence of defective products due to poor contact.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a milling head equipped with a rotary tool contact confirmation device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a turning center equipped with the rotary tool contact confirmation device.

[Explanation of symbols]

8 ... Spindle, 9 ... Rotating tool mounting hole, 9a ... Tool positioning surface, 10 ... Rotating tool, 10a ... Collar part, 15 ... Coupling, 20 ... Air supply path in spindle, 20a ... Air inlet, 20b ... Air outlet , 22 ... close contact detection sensor, 25 ... open / close valve, 27 ... external air supply path

Claims (1)

[Scope of utility model registration request] 1. An air outlet is provided on a tool positioning surface in a rotary tool mounting hole of a spindle, and an air supply path for sending compressed air from a housing supporting the spindle to the air outlet is provided on the air supply path. A rotating tool contact confirmation device equipped with a contact detection sensor that detects the back pressure at the air outlet and performs contact confirmation.