JPH0655374A - Insert press-fitting device - Google Patents

Abstract

PURPOSE:To facilitate the quality guarantee of press-fitting by providing a load cell fitted with a workpiece support base so as to detect pressure acting upon the workpiece support base, and a position sensor for detecting the vertically moving speed of a press-fitting shaft. CONSTITUTION:Pressure acting upon a workpiece support base 2 from a press- fitting shaft 4 is detected by a load cell 5 so as to detect the press-fitting pressure of an insert component 3 into a workpiece 1. The moving speed of the press-fitting shaft 4 is detected by a position sensor 6 so as to detect the press- fitting speed of the insert component 3 into the workpiece 1. On the basis of the detection, the press-fitting pressure and press-fitting speed can be controlled, and as a result, the press-fitting quality of the insert component 3 into the workpiece 1 can be guaranteed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert press-fitting device for press-fitting insert parts such as nuts into a work such as a molded product.

[0002]

2. Description of the Related Art An insert part such as a nut is press-fitted into a press-fitting hole formed in a work such as a molded product so that the insert part is embedded in the work and attached. When press-fitting the insert parts into the work, the insert press-fitting device is equipped with a work support base for setting the work on the upper part and a press-fit shaft arranged above the work support base and vertically driven by a hand press, an air press, or the like. Can be done using. That is, this insert press-fitting device sets the work on the work support and holds the insert part at the lower end of the press-fitting shaft so that it can be detached, and then moves the press-fitting shaft downward to press-fit the insert part into the press-fitting hole of the work. It was done like this.

[0003]

However, when press-fitting an insert part into a workpiece using the insert press-fitting device as described above, the quality of press-fitting depends on the speed of press-fitting and the pressure of press-fitting. There is a problem that it is difficult to control the press-fitting pressure within a preferable range and the quality cannot be guaranteed.

The present invention has been made in view of the above points, and an object of the present invention is to provide an insert press-fitting device which facilitates quality assurance of press-fitting.

[0005]

An insert press-fitting device according to the present invention is a work support base 2 on which a work 1 is set, and a work support base 2 which is vertically moved above the work support base 2 and is detachably attached to a lower end thereof when the work support base 2 is moved downward. The press-fitting shaft 4 for press-fitting the insert part 3 held in the work 1 into the work 1, the load cell 5 for mounting the work-supporting base 2 and detecting the pressure acting on the work-supporting base 2, and detecting the vertical movement speed of the press-fitting shaft 4. A position sensor 6 is provided.

[0006]

The pressure of the insert part 3 to the work 1 can be detected by detecting the pressure acting on the work support base 2 from the press-fit shaft 4 by the load cell 5, and the moving speed of the press-fit shaft 4 can be detected by the position sensor. The press-fitting speed of the insert part 3 into the work 1 can be detected by detecting 6 and the press-fitting pressure and the press-fitting speed can be controlled based on these detections.

[0007]

EXAMPLES The present invention will be described in detail below with reference to examples. The load cell 5 is attached so as to be horizontally supported in a cantilever state by fixing one end portion to a fixed table 11 provided on a table 10a of a base 10 of the apparatus by a bolt 12. The work support base 2 is attached on the tip of the load cell 5, and a work receiving portion 13 into which the work 1 is detachably fitted is formed on the upper surface of the work support base 2.

A press-fitting shaft 4 is arranged directly above the work support base 2. The press-fitting shaft 4 is attached through a mounting sleeve 14 in the vertical direction, and a slider 16 is vertically slidably attached to a guide rail 15 which is vertically fixed to a column 10b of a base 10 and the mounting sleeve 14 is attached to the mounting sleeve 14. It is attached to the slider 16. Therefore, the press-fitting shaft 4 is vertically movable along the guide rail 15. Further, the press-fitting shaft 4 is formed in a hollow cylindrical shape, and a suction port 17 is formed in the opening at the lower end thereof, and a suction hose 18 connected to a vacuum pump or the like is connected to the opening at the upper end.

The press-fitting shaft 4 is vertically driven by a cylinder device. For example, by connecting the cylinder rod of the cylinder device to the upper end of the press-fitting shaft 4, the press-fitting shaft 4 can be driven up and down. As the cylinder device, it is possible to use a so-called motor cylinder (power cylinder) in which a motor is used as a drive source and its rotational drive force is transmitted as a reciprocating drive force to a cylinder rod to operate.
The reciprocating drive speed of the cylinder rod can be controlled by variably controlling the rotation speed of the motor by the electric power converted by the inverter, and the reciprocating drive speed of the press-fitting shaft 4 can be freely changed. .

Further, a detection plate 19 is fixed to the press-fitting shaft 4 and horizontally protrudes to the side, and a position sensor 6 is disposed directly below the detection plate 19 so as to face the front end thereof. . The position sensor 6 is attached to a fixed position such as the column 10b of the base 10 so that the position does not change. The position sensor 6 is formed by a photoelectric distance sensor (displacement sensor) or the like, and the distance between the position sensor 6 and the detection plate 19 that moves up and down when the press-fitting shaft 4 is moved up and down. The vertical movement speed of the press-fitting shaft 4 can be detected by measuring the change of the above with time.

In the insert press-fitting device formed as described above, by supplying the insert part 3 such as a nut having a knurled outer periphery to the suction port 17 at the lower end of the press-fitting shaft 4 while sucking from the suction hose 18. The insert part 3 is held in the suction port 17 by the suction force. Then, after inserting the work 1 such as a molded product into the work receiving portion 13 of the work support base 2 and setting it, the cylinder device is operated to drive the press-fitting shaft 4 downward, and the insert part held at the lower end of the press-fitting shaft 4. 3 can be press-fitted and inserted into the insert hole 20 formed in the work 1.

When press-fitting and inserting the insert part 3 into the work 1 in this way, the insert part 3
The press-fitting pressure for press-fitting is received by the work support base 2 as a force for pressing the work 1 by the press-fitting shaft 4, and this pressing force is received as a load by the load cell 5 and is detected. By detecting the pressure acting on the table 2 with the load cell 5, the press-fitting pressure of the insert part 3 into the work 1 can be detected. When the press-fitting shaft 4 is vertically driven to press-fit the insert part 3 into the work 1, the driving speed of the press-fitting shaft 4 can be detected by the position sensor 6.
The press-fitting speed of the insert part 3 into the work 1 can be detected by detecting the drive speed. Then, by controlling the output of the cylinder device according to the press-fitting pressure detected in this way, the insert part 3 can be press-fitted into the work 1 by controlling to a predetermined good press-fitting pressure. By controlling the operating speed of the cylinder device according to the press-fitting speed thus detected, the insert part 3 can be press-fitted into the work 1 while controlling the press-fitting speed to a predetermined good value. Therefore, the press-fitting becomes insufficient and the press-fitting strength of the insert part 3 into the work piece 1 becomes insufficient, and the press-fitting becomes excessive so that cracks and the like do not occur in the work piece 1. It is possible to make it uniform and to perform high quality assurance of press fitting. Further, by controlling the driving speed of the press-fitting shaft 4 to be high before and after press-fitting and optimally at the time of press-fitting, the work of the insert can be efficiently performed.

[0013]

As described above, according to the present invention, since the work support is attached, the load cell for detecting the pressure acting on the work support and the position sensor for detecting the vertical movement speed of the press-fitting shaft are provided. By detecting the pressure acting on the work support from the press-fitting shaft with the load cell, the press-fitting pressure of the insert part to the work can be detected, and by detecting the moving speed of the press-fitting shaft with the position sensor, the insert to the work is performed. The press-fitting speed of the parts can be detected, and the press-fitting pressure and the press-fitting speed can be controlled based on these detections, which facilitates the quality assurance of the press-fitting.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention.

[Explanation of symbols]

 1 Work 2 Work Support 3 Insert Parts 4 Press-fit Shaft 5 Load Cell 6 Position Sensor

Claims (1)

[Claims] 1. A work supporting base for setting a work on an upper part, a press-fitting shaft for press-fitting an insert part detachably held at a lower end into a work when the work supporting base is vertically moved above the work supporting base and moves downward, and the work supporting base. An insert press-fitting device comprising a load cell for mounting a base and detecting a pressure acting on the work support base, and a position sensor for detecting a vertical movement speed of the press-fitting shaft.