JP2704392B2 - Riveting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a riveting machine.

[0002]

2. Description of the Related Art A riveting machine for forming a rivet head on a plurality of rivets at a time is already known.

[0003] The above-mentioned riveting machine is a multi-axis square, and forms a rivet head on a rivet by a forming axis of the rivet head forming tool while transmitting rotation transmission from each axis to the rivet head forming tool.

In the above riveting machine,
If the head forming tool is stationary, the rivet head cannot be formed if the rivet arrangement changes. That is, it is a dedicated machine in which rivets are arranged at fixed positions.

Therefore, if the position of the head forming tool is made variable, the rivet head can be formed even when the position of the rivet is changed.

However, since the position of the head forming tool is manually changed, the operation is remarkably troublesome, and the operating rate of the machine is reduced.

[0007] In addition, since accurate positioning is difficult, it may cause defective products.

An object of the present invention is to make it possible to change the position of a head molding tool very easily and accurately.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a spindle which is supported by a cylinder supported by a column and which is passed through a shaft of the piston shaft together with a piston shaft. A riveting machine that presses the molding shaft of the molding tool provided at the lower end of the spindle onto the work rivet of the workpiece on the table while lowering the spindle, and drives the spindle by a motor to form a rivet head on the work rivet. In the above, a plurality of sliders which slide in a predetermined direction by an appropriate horizontal guide means are provided on a supporting member which moves up and down together with the piston shaft, and each slider bears an output shaft having a molding tool at a lower end thereof. Each input shaft is supported on the support member by being positioned above the output shaft. The rotation of the spindle is transmitted to the shaft via an appropriate transmission means, and both ends of the expansion joint having a rotation transmitting function are connected to the input shaft and the output shaft via a universal joint. And an output shaft of a servo motor is connected to the advance / retreat mechanism and held by the support member.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a cylinder 3 is supported at the upper end of a column 2 erected from a seat 1.

Further, a spindle 5 is provided on the axis of the piston shaft 4 which moves up and down by the contraction and extension of the cylinder 3 so as to penetrate and rotate freely at a fixed position.

Further, a box-shaped support member 6 is provided at the lower end of the piston shaft 4, and a plurality of sliders 7 which are slid in a predetermined direction by horizontal guide means are provided on the lower surface of the support member 6. .

The above-mentioned guide means guides the guide rail 9 attached to the support member 6 into grooves 8 on both sides of the slider 7 in the case shown.

The number of sliders 7 is not limited to two on the left and right in the figure, and may be provided more than two.

Each slider 7 has an output shaft 11 whose lower end has a vertical axis with a molding tool 10 mounted thereon.

Further, an input shaft 12 located above each output shaft 11 is supported on the support member 6.
The rotation of the spindle 5 is transmitted to each input shaft 12 via a transmission mechanism 13.

In the illustrated transmission mechanism 13, gears provided on the spindle 5 and the input shaft 12 are engaged with each other in the illustrated case.
It may be transmitted in a method other than the above.

Further, both ends of an expansion joint 14 having a rotation transmitting function are connected to the input shaft 12 and the output shaft 11 via a universal joint 15.

The expansion joint 14 having the rotation transmitting function is
The illustrated spline shaft and the spline hole are not limited to fitting, but may be a square shaft and a square hole.

Further, an advancing / retracting mechanism 1 comprising a ball screw and a nut (fixed to the slider 7) for each slider 7
The output shaft of a servomotor 17 supported by the support member 6 is connected to the ball screw of the advance / retreat mechanism 16.

The spindle 5 is driven by a motor 19 installed on the upper end of the cylinder 3. Of course, since the spindle 5 moves up and down, as is well known (not shown), for example, a spline hole of the shaft core of the spindle 5 and an output spline shaft of the motor 19 are fitted and connected to expand and contract without impairing rotation transmission. Is adopted.

With the above construction, the supporting member 6 is lowered together with the piston shaft 4 by the extension action of the cylinder 3, and the forming shaft 10 'of each forming tool 10 is attached to the work rivet A of the workpiece on the table 18. Press.

On the other hand, since the spindle 5 descending with the piston shaft 4 is driven by the motor 19, the rotation of the spindle 5 is transmitted by the transmission mechanism 13, the input shaft 12, the universal joint 15 having the expansion joint 14, and the output shaft 11.
And transmitted to the molding tool 10.

Therefore, the rivet head is formed on the work rivet A by the precession of the forming shaft 10 '.

Next, when the position of the work rivet to be formed is displaced outward or inward, the servomotor 17 is operated by numerical control.

Then, each slider 7 is moved by the reciprocating mechanism 16.
Slides outward or inward.

At this time, the fluctuation of the distance between the input shaft 12 and the output shaft 11 is adjusted by the expansion joint 14.

As a result, the molding tool 10 reaches (coincides) immediately above the work rivet A.

As is well known, when the Z-axis control (elevating and lowering the support member 6 together with the cylinder 3 by operating the driving device 31 shown in FIG. 1) is adopted, the work rivets A having the arrangement shown in FIG. The head can be molded.

[0031]

As described above, according to the riveting machine according to the present invention, a plurality of forming tools can be moved to predetermined positions by sliding the slider by the numerical control operation of the servo motor. It is possible to automatically and accurately change the pitch between tools.

Therefore, the processing efficiency can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a front view of a riveting machine according to the present invention.

FIG. 2 is a partially cutaway enlarged front view showing a main part.

FIG. 3 is a front view showing an arrangement of work rivets.

[Description of Signs] 1 Seat 2 Column 3 Cylinder 4 Piston Shaft 5 Spindle 6 Supporting Member 7 Slider 8 Groove 9 Rail 10 Molding Tool 10 'Molding Shaft 11 Output Shaft 12 Input Shaft 13 Transmission Mechanism 14 Expansion Joint 15 Universal Joint 16 Advancing / retracting mechanism 17 Servo motor 18 Table 19 Motor A Work rivet

Claims (1)

(57) [Claims] 1. A molding tool provided at a lower end of the spindle while lowering a spindle which is passed through the axis of the piston shaft together with the piston shaft by the action of a cylinder supported by a column, and is lowered. While pressing the shaft against the work rivet of the workpiece on the table,
In a riveting machine that drives the spindle by a motor to form a rivet head on a work rivet, a supporting member that moves up and down together with the piston shaft is provided with a plurality of sliders that slide in a predetermined direction by appropriate horizontal guide means. An output shaft having a molding tool at the lower end is mounted on each slider, and each input shaft is mounted on the support member by being positioned above each output shaft. The rotation of the spindle is appropriately applied to each input shaft. Transmission via transmission means, furthermore, both ends of the expansion joint with rotation transmission function are connected to the input shaft and output shaft via a universal joint, and each slider is provided with an advance / retreat mechanism comprising a ball screw and a nut, The output shaft of the servomotor is connected to the advance / retreat mechanism by the support member. Betting machine.