JP2001105233A - Servo motor driven tapped hole machining device using numerical control instruction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine a tapped hole concurrently with press punching operation for rationalizing work for machining a tapped hole in press punched parts. SOLUTION: A tapped hole machining device which has a tap 4 mounted on a motor shaft of a servo motor 1 driven by a numerical control device 2 via a tap holder 5 and a sleeve 6 is assembled in a female mold 15 of a press die for machining a tapped hole in a workpiece 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a tap hole at the same time as a press punching operation when a screw hole is formed in a stamped part.

[Prior Art] In most cases, screw holes are formed in a separate step after press punching by using a tap hole forming machine.

[0003] One cycle time of the press punching operation is as short as about 0.5 second to about 1 second. It is necessary to complete the screw hole machining operation within this time. Therefore, the tap rotation drive motor must be able to start and stop instantly.

[Means for Solving the Problems] The screw hole drilling operation is to rotate the tap in the normal direction to perform tapping on the workpiece, and, after the tapping is completed, rotate the tap in the opposite direction to rotate the tap. There is an operation to pull out the tap from. These two operations must be performed in a short time. Therefore,
In order to start and stop the drive motor instantly, a servo motor with excellent responsiveness was adopted. The main body of the tapping device in which the servo motor (1) and the tap (4) are assembled is mounted inside the lower die (15) of the press die. The tap (4) is fixed to the tap holder (5) by a set bolt (8). The tap bolt (5) is inserted into the sleeve (6) fixed to the motor shaft, and the pin (1) is inserted.
0) transmits the torque of the motor to the tap holder (5). Inside the tap holder (5) and the sleeve (6), a spring (7) for vertically floating the tap (4) is fixed by pins (11 and 12). This spring is a dual-purpose type that can be pulled and compressed. The lower die (15) has lifter pins (17)
And the work piece (1) is supported by the ring pin.
6) is attached. The spring (18) supports the vertical movement of the lifter pin. Upper model (14)
Performs up and down movement, and at the lowermost end, the workpiece (16)
Is pressed down, and is brought into close contact between the upper surface of the lower mold (15) and the lower surface of the upper mold (14). Next, when the upper die (14) rises, the workpiece (16) is pushed up by the force of the spring (18) via the lifter pin (17). The numerical controller (2) is for controlling the rotation operation of the servo motor (1), and instructs a series of operating conditions of the servo motor necessary for the tapping operation in advance. The operating conditions are a forward rotation speed, a rotation speed, a forward rotation stop command, a reverse rotation start command, a reverse rotation speed, a rotation speed, a reverse rotation stop command, and the like of the tap. The proximity switch (3) detects the start of rotation of the servo motor (1), and the upper die (14)
Descends and approaches the proximity switch (3), a detection signal is sent to the numerical controller (2), and the servo motor (1) starts. Regarding the structure and operation function of the tap hole processing apparatus of the present invention, a series of tap hole processing operations when used in a progressive die are as follows. When the upper die (14) descends and pushes down the workpiece (16) and the proximity switch (3) detects the upper die (14), a signal is sent to the control device (2) and the servo motor (1) is turned on. Upon activation, the tap (4) rotates, and the tap (16) bites the workpiece (16) to perform tapping. When the number of rotations previously instructed to the control device (14) is completed at the time of the tapping operation, a reverse rotation command is immediately issued, the servomotor is reversed, and the tap (4) is moved from the workpiece (14). In this case also, when the number of rotations previously instructed is completed, the servomotor (1) is automatically stopped, and the tap hole forming operation ends. The tap (4) that bites into the workpiece (16) moves up and down while rotating together with the workpiece.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to perform tap hole machining in conjunction with a cycle of press punching, so that prompt operation is required. Focused on the development of the device.

[Effect of the Invention] It becomes possible to incorporate the tap hole processing apparatus of the present invention into a mold, and the screw hole processing is completed at the same time as the press punching operation. It contributes to labor saving and helps reduce processing costs.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

[Explanation of symbols]

 1 is a servomotor 2 is a numerical controller 3 is a proximity switch 4 is a tap 5 is a tap holder 6 is a sleeve 7 is a spring 8 is a set bolt 9 is a set bolt 10 is a pin 11 is a pin 12 is a pin 13 is a motor base 14 is an upper part. Mold 15 is lower mold 16 is workpiece 17 is lifter pin 18 is spring

Claims (1)

[Claims] 1. A method for forming a screw hole in a stamped part,
A tap hole processing device devised so that it can be processed simultaneously in the press punching operation process, and a device that employs a servomotor based on a numerical control (NC) command as a rotary driving device of the tap. The tapping device main body is incorporated into the mold.