JPH0418734Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an automatic rivet head sharpening machine, and is designed to automatically sharpen rivet heads protruding from the work surface.

<Prior Art> Rivet joints using rivets are often used as a means of fastening metal plates, shapes, etc.
In this riveted joint, as shown in Figure 5a,
Since the rivet head 2 protrudes from the surface 1 (hereinafter referred to as "working surface") of the fastening member, the rivet head 2 is shaved off to be flush with the working surface 1 (see FIG. 5b).

<Problems to be Solved by the Invention> Conventionally, the cutting of the rivet head as described above was performed by manually holding a cutting tool. This resulted in poor work efficiency.

It is conceivable to use a robot to automate the cutting of the rivet head, but in this case the following new problems will arise. (a) In rivet head cutting, the cutting tool must be held perpendicular to the work surface. Therefore, when the work surface has a curved surface, it is necessary to have an angle control function that determines the angle perpendicular to the work surface, which complicates the head mechanism, complicates the control system, and increases costs. invite.

(b) When a cutting tool is rigidly supported by a robot, the cutting tool is easily damaged. This is because the cutting speed is not generated in the center of the cutting edge with a flat tip, and the cutting tool is not shaken because it is rigidly supported, so wear concentrates on the center of the cutting edge and it does not cut quickly. This is because you get used to it.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide an automatic rivet head shaving machine that can automatically perform rivet head cutting and has a simple configuration.

<Means for Solving the Problems> The structure of the present invention that achieves the above object is supported by a main body placed facing the work surface on which the rivets are driven, and is movable within the surface facing the work surface. an arm drive unit that moves the arm and performs fine reciprocating motion of the arm along the direction of arm movement; an extendable mechanism provided at the tip of the arm that extends and contracts from the arm toward the work surface; and this extendable mechanism. A head comprising a support fixed to the tip of the head and an end plate supported by the support so as to tilt when pressed against the work surface so as to face the work surface, and a cutting blade for cutting the rivet head of the rivet. It is characterized by having a cutting tool located at the center of the end plate and provided on the end plate, and an advancing/retracting means for moving the cutting tool forward and backward.

<Function> When the head position is determined by the movement of the arm, the telescoping mechanism extends and the head approaches the work surface. When the end plate of the head is pressed against the work surface, it tilts to face the work surface and the cutting tool becomes perpendicular to the work surface.
Thereafter, the rivet head is cut using a cutting tool. Furthermore, since the tool vibrates slightly during cutting, wear at the center of cutting is dispersed and tool life is extended.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings. Fig. 1 is an overall perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view extracting the arm drive section, Fig. 3 is a perspective view extracting the telescoping mechanism and the head, and Fig. 4 is a perspective view extracting the arm drive section. FIG. 3 is a perspective view showing an extracted head.

As shown in FIG. 1, a large number of tack heads 2 protrude from a work surface 1. The main body 10 faces the work surface 1 at a certain distance and can move along the guide 12 in the X direction. Further, this main body 10 includes a control device 1
4 and a motor controller 16 (see FIG. 2).

The control device 14 and the motor controller 16 are connected by a cable 17, and the motor 22 and the motor controller 16, which will be described later, are connected by the cable 1.
They are connected by 8.

The arm 20 extends from the main body 10 in the X direction.
The motor 21 of the arm drive section
Move by 22. In other words, a transmission mechanism (not shown) is actuated by the drive of the motor 21, and the arm 20
moves in the Y direction. Also, motor 22 and arm 2
A transmission mechanism consisting of a gear 23, a timing belt 24, a gear nut 25, and a ball screw 26 is provided between the two (see FIG. 2), and the arm 20 is moved in the X direction by the drive of the motor 22. The motor 22 is then driven under the control of the motor controller 16.

The air cylinder 30 serving as the expansion and contraction mechanism is the arm 20
It is provided at the tip of the piston rod 3.
2 and guide rod 34 extend and retract toward the work surface 1.

The support portion 41 of the head 40 is connected to the piston rod 3.
2 and the tip of the guide rod 34 (see FIGS. 3 and 4). The support portion 41 has a gimbal structure including a ring member 42 and an end plate 43 as constituent members. In other words, the support portion 41 pivotally supports the ring member 42 via the pivot bearing 44, the ring member 42 pivots the end plate 43 via the pivot bearing 44, and the pivot shafts of the pivot bearings 44 and 45 are Orthogonal. The end plate 43 can therefore be freely tilted in a plane facing the working surface. Furthermore, the end plate 43 is provided with three contact points 4 at equal intervals in the circumferential direction.
6a, 46b, and 46c are provided.

The cutting tool 50 is provided on the end plate 43, and its cutting edge 52 is located at the center of the end plate 43. This cutting tool 50 is moved forward and backward by an air cylinder 60 which is a forward and backward movement means, and the feed rate of the cutting tool 50 is controlled by a hydro checker 62.

Next, the operation of this embodiment will be explained. First, the motors 21 and 22 are driven to move the arm 20 to a previously taught position. Next, the air cylinder 30 is operated, the piston rod 32 and the guide rod 34 are extended, and the head 40 is advanced toward the work surface 1. When one of the contact points 46a, 46b, 46c provided on the end plate 43 of the head 40 contacts the work surface 1, the other two contact points move in the direction in which they contact the work surface 1 as the head 40 advances. The end plate 43 naturally tilts. In this way 3
The air cylinder 30 stops when all three contact points 46a, 46b, and 46c contact the work surface 1, and at this time, the cutting tool 50 provided on the end plate 43
is perpendicular to the work surface 1. After that, cutting blade 5
2 is rotated, and the cutting tool 50 is sent out toward the rivet head 2 by the air cylinder 60.
This feed rate is controlled by a hydro checker 62. Further, when cutting the rivet head 2 with the cutting blade 52 of the cutting tool 50, the motor 22 alternately rotates forward and reverse in response to commands from the control device 10, and the arm 20 reciprocates in the X direction. This reciprocating motion has a maximum range of 1 mm and a frequency of 2 to 3 times/second. For this reason, the cutting blade 52 also slightly vibrates in the X direction during cutting, so that wear at the center of the cutting blade 52 is dispersed.

In the above embodiment, the end plate 43 is tilted by the gimbal structure to face the work surface 1, but the end plate 43 may be supported by a flexible structure such as a spherical bearing.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, the present invention provides the following effects.

() When the head approaches the work surface, the end plate of the head naturally tilts to face the work surface, so there is no need to introduce an expensive and complicated angle control function.
Vertical indexing is possible, and the rivet head can be cut automatically using a simple mechanism.

() Since the cutting tool is slightly vibrated while cutting the rivet head, wear on the center of the cutting edge is dispersed and the tool life is extended.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view extracting the arm drive section, and Fig. 3
The figure is a perspective view extracting the telescoping mechanism and head.
FIG. 4 is a perspective view showing an extracted head, and FIGS. 5a and 5b are explanatory views showing the state of cutting the rivet head. In the drawing, 1 is the work surface, 2 is the rivet head, 10 is the main body,
12 is a guide, 14 is a control device, 16 is a motor controller, 17, 18 are cables, 20 is an arm, 21, 22 are motors, 23 is a gear, 24 is a timing belt, 25 is a gear nut, 26 is a ball screw, 30 is a Air cylinder, 32 is a piston rod, 34 is a guide rod, 40 is a head, 41
is a support part, 42 is a ring material, 43 is an end plate, 44,
45 is a pivot bearing, 46a, 46b, 46c are contact points, 50 is a cutting tool, 52 is a cutting blade, 60 is an air cylinder, and 62 is a hydro checker.

Claims (1)

[Scope of utility model registration request] An arm that is supported by a main body that is placed facing the work surface on which the rivets are driven and is movable within the plane facing the work surface, and a movement of this arm and a slight reciprocating motion of the arm along the arm movement direction. an arm drive unit provided at the tip of the arm that expands and contracts from the arm toward the work surface; a support portion fixed to the tip of the telescoping mechanism; and a support unit that tilts when pressed against the work surface and moves the work surface toward the work surface. a head comprising an end plate supported by the support portion so as to face the rivet; a cutting tool provided on the end plate with a cutting blade for cutting the rivet head located at the center of the end plate; An automatic rivet head sharpening machine characterized by having a means for advancing and retracting a tool.