JP2001179382A - Rivet caulking machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rivet caulking machine capable of elevating accuracy of calculating a workpiece angle. SOLUTION: The rivet caulking machine comprises a stem that is horizontally held in axis and capable of reciprocatively moving in the axial direction receiving drive from a reciprocal driving source, an anvil 470 that is mounted facing to the stem and caulks a rivet at the clearance of the stem along with the reciprocal movement of the stem, and a workpiece-holding unit 100 that moves in order for placing the workpiece between the stem and the anvil. The workpiece-holding unit 100 comprises an index table 170 capable of rotating the workpiece that is held thereby at each desired angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rivet setting machine for setting a rivet on a work.

[0002]

2. Description of the Related Art When riveting a work, a rivet setting machine 50 shown in FIGS. 9 and 10 is conventionally used. This rivet caulking machine 50 has a column 5
1 has a setting rod 52 guided vertically to the axis, and a stem 53 is integrally connected to the setting rod 52. The setting rod 52 is connected to a link mechanism 55 that operates in response to the drive of the motor 54, and is configured to reciprocate in the axial direction by operating the link mechanism 55 in response to the drive of the motor 54. I have. Also, on the moving path of the stem 53,
A catcher 57 capable of holding rivets (not shown) separated and supplied one by one from the rivet supply unit 56 is provided, and this catcher 57 is also operated by a link mechanism (not shown) that is driven by the motor 54. ) Can be reciprocated vertically.

On the other hand, a bracket 58 is provided on the column 51.
A roll set 61 having an anvil 59 and a pilot pin 60 is arranged on the bracket 58. The anvil 59 and the pilot pin 60 of the roll set 61 are provided so as to face the stem 53. The pilot pin 60 is slidable with respect to the anvil 59 and is urged so as to always protrude toward the stem 53. Is provided.

When the rivet is set on the work using the rivet setting machine 50, a pilot pin 60 is inserted through a prepared hole provided in the work, and a rivet is supplied to the catcher 57. Thereafter, when the motor 54 is driven, the catcher 57 and the stem 53 are lowered, and first, the catcher 57 stops at a position close to the pilot pin 60. After that, the stem 53 continues to descend by the action of the link mechanism 55, and pushes out the rivet held by the catcher 57. As a result, the rivet is supported by the stem 53 and the pilot pin 60 and inserted into the prepared hole of the work, and the shaft end is caulked by the anvil 59.

[0005]

However, in the above-mentioned conventional rivet caulking machine, for example, a rivet is continuously formed on a workpiece having a plurality of pilot holes formed radially by opening a curved surface of a member having a curved shape. In the case of caulking, in order to sequentially position each pilot hole on the movement path of the stem, the curved surface of the work must be oriented in the vertical direction and supported so as to be indexable. As an angle indexing device, an index table provided with an indexing table that rotates intermittently in units of a set angle is well known. The index table must be installed so that the rotating surface of the output table is vertical. When performing indexing while holding a workpiece on the index table arranged in this way, the rotational moment when rotating the workpiece becomes large, and problems such as a decrease in angle indexing accuracy have occurred. Was.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a stem which is held horizontally and which can reciprocate in the axial direction by being driven by a reciprocating drive source. And an anvil provided opposite to the stem for caulking a rivet between the stem and the stem in accordance with the reciprocating movement of the stem.

Further, according to the present invention, there is provided a stem which is held horizontally and which can be reciprocated in the axial direction under the driving of a reciprocating drive source, and which is provided opposite to the stem and which is associated with the reciprocating movement of the stem. An anvil for caulking a rivet between the stem and a work holding unit that moves to place a work between the stem and the anvil is provided.

It is preferable that the work holding unit has an index table for rotating the held work at predetermined angles. Further, it is preferable that the work holding unit includes an index table that can rotate the held work at every predetermined angle and a clamp that holds the work at a predetermined position of the index table.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8, reference numeral 1 denotes a rivet caulking machine, which includes a work holding unit 100 and a caulking unit 300 attached to a frame 2. This rivet caulking machine is used in a process of assembling a brake shoe to be incorporated in a drum brake of an automobile, and a brake shoe serving as a work W is, as shown in FIGS. 8A and 8B, The shoe body W1 and the lining W2 are curved so as to overlap each other. A plurality of pilot holes h... That are open on the curved surface are formed in radially in four steps, and a rivet is inserted through each pilot hole h and swaged to form the shoe main body W1 and the shoe main body W1. The lining W2 is configured to be integrated. Further, a drum (not shown) of a drum brake is provided on the shoe body W1.
A pin insertion hole W3 into which an anchor pin (not shown) is inserted when assembling is formed.

The work holding unit 100 is provided with an arrow Y along rails 110, 110 laid on the frame 2.
Slide table 1 slidably provided in one direction
The slide table 120 is connected to a well-known rodless cylinder 130. An air cylinder 140 is attached to the slide table 120, and an elevating table 150 is connected to a piston rod 141 (hereinafter simply referred to as a rod 141) of the air cylinder 140.

A slide unit 160 configured to slide in a direction (arrow Y2 direction) orthogonal to the slide direction of the slide table 120 is disposed on the elevating table 150.
An index table 170 is connected to 60. The index table 170 is a well-known index table having an index table 171 that rotates intermittently at predetermined angle intervals in the direction of arrow Y4 when driven by a built-in motor (not shown). (Not shown) for holding the power supply. By this clamp, as shown in FIG. 8A, the workpiece W has a curved surface standing upright on the rotation surface of the indexing table 171 and an intersection of the center lines of the radially provided pilot holes with the indexing table 171. Is held at a position coinciding with the center line of rotation.

On the other hand, the caulking unit 300 has a tool table 310 fixed to the bracket 2a of the frame 2, and a hydraulic cylinder 320 is attached to the tool table 310. This hydraulic cylinder 3
20 piston rods 321 (hereinafter simply referred to as rod 321)
) Is configured to extend and contract horizontally in the axis direction, and a shaft-shaped connecting member 330 is integrally connected to the rod 321. The connecting member 330 is guided by a bearing 341 arranged on a guide table 340 integrated with the tool table 310.
The stem 350 is integrally fixed to the tip of the.

A slide shaft 360 is slidably guided on the tool table 310 and the guide table 340 via bearings 311 and 342, respectively. A chuck unit 370 is attached to the tip of the slide shaft 360. A chuck base 380 connected and supported is integrally attached. A screw shaft 390 is fixed to the chuck base 380, and the screw shaft 390 extends through a bracket 331 attached to the connecting member 330. A spring 400 for urging the chuck base 380 forward is fitted on the screw shaft 390, and the spring 400
The nut 410 that regulates the forward movement of the chuck base 380 due to the urging is screwed. With this configuration, the stem 350 and the chuck unit 370 can reciprocate integrally, and the stem 350 can reciprocate even when the chuck unit 370 is stopped.

The chuck unit 370 includes a chuck body 371 fixed to a chuck base 380, and a pair of chuck claws 372 connected to the chuck body 371.
The chuck jaws 372 and 372 are attached to the chuck main body 371 by being urged so as to be rotatable and always closed by a spring (not shown). On the opposing surfaces of the chuck claws 372 and 372, the chuck claws 3 are provided.
When the rivets 72 and 372 are closed, a holding hole 373 having a hole shape into which a rivet can be fitted is divided and formed.
0 so that it is always located on the moving path.

A holder 430 is fixed to the guide table 340 via a bracket 420 so that a swing pipe 440 can rotate and one end of the holder 430 communicates with the holding hole 373 at all times. It is attached by urging. Further, a hose connection pipe 450 is attached to the holder 430, and a hose (not shown) for rivet pressure feeding extending from a rivet supply unit (not shown) is connected to the pipe 450. The other end of the swing pipe 440 is always in communication with the hose connection pipe 450, and a rivet fed from a rivet supply unit (not shown) is held in the holding hole 373.
It is configured so that it can be guided to.

The caulking unit 300 has a roll set 460 installed opposite the stem 350. The roll set 460 is used for the frame 2
Attached to the bracket portion 2b fixed to the
An anvil 470 is fixed to the stem 350 so as to extend horizontally along an axis thereof, and a pilot pin 480 is arranged concentrically with the anvil 470. Pilot pin 480 is configured to be slidable in its axial direction (horizontal direction), and is normally urged by spring 490 in a direction protruding from anvil 470.

The caulking unit 3 configured as described above
00 are provided in the present apparatus, and they are installed such that the stems 350 are arranged at the same interval as the pitch P1 between the first and second prepared holes h of the work W. Therefore, rivets can be simultaneously caulked in the first and second prepared holes h of the work W. The work W
Each pitch P of the first and second stage, the third and fourth stage pilot holes
1 and P2 are the same.

In the rivet setting machine 1, the work is moved to the work receiving position S1 by the work supply unit (not shown).
The upper position is supplied and held there.

Next, by moving the slide table 120, the work W moves below the caulking unit 300,
Subsequently, the lifting table 1 by the operation of the air cylinder 140
As the position 50 rises, it is disposed between the chuck unit 370 and the anvil 470 (hereinafter, this position is referred to as an angle indexing position S2). In this state, when the index table 170 is operated to rotate the indexing table 171 by the set angle, the predetermined pilot hole h of the work is
Positioned on the 0 and anvil 470 axis extensions.

When the pilot hole h is positioned, the elevation unit 150 is horizontally moved by the operation of the slide unit 160. As a result, the work moves to the anvil 470 side, and the pilot pin 480 is inserted into the prepared hole h of the work W.

Next, the chuck pawl 3
After the rivet is pressure-fed into the holding holes 373 of the 72 and 372, the hydraulic cylinder 320 operates to move the connecting member 330 forward. Thereby, the stem 350 and the chuck unit 370 move forward. In the chuck unit 370, the tips of the chuck claws 372 and 372 are connected to the pilot pin 480.
When it reaches a position close to, it comes into contact with a stopper (not shown) and stops.
50 advances and pushes out the rivet held by the chuck claws 372 and 372. At this time, the chuck claws 372, 37
Since rivet 2 is close to pilot pin 480, the rivet pushed out from chuck claws 372 and 372 has its shaft end supported by pilot pin 480.

The pilot pin 480 retracts into the anvil 470 as the stem 350 advances. Therefore, as described above, the stem 350 and the pilot pin 480 are used.
The rivet whose both ends are supported by is inserted into the prepared hole of the work, and the shaft end is pressed against the anvil 470 and caulked.

After caulking the rivet, the stem 350
The chuck unit 370 is once returned to the original position by the backward movement of the hydraulic cylinder 320, and the work is also temporarily returned to the angle indexing position S2 by the horizontal movement of the elevating table 150. The work W returned to the angle indexing position S2 is rotated by a predetermined angle again by the operation of the index table 170. Thereby, the pilot hole h for caulking the rivet is positioned on the axial extension of the stem 350 and the anvil 470 next. Thereafter, the above operation is repeated to perform the rivet caulking operation.

In this way, the first and second prepared holes h
When all the rivets have been caulked, the work W returned to the angle indexing position S2 is raised by the operation of the air cylinder 140. Thus, the third and fourth prepared holes h of the work W can be positioned on the axial extension of each of the stems 350 and the anvil 470 in the caulking units 300, 300, and the third and fourth prepared holes are continuously formed in the same manner as described above. A rivet is swaged in each prepared hole h of the fourth stage.

[0025]

According to the rivet caulking machine of the present invention, since the rivet is caulked in a horizontal attitude, the index table can be arranged with the rotating surface of the indexing table horizontal. There are advantages. Therefore, even for a workpiece that requires angle indexing and positioning of a pilot hole when caulking a rivet, the angle indexing accuracy can be improved, and the pilot hole of the workpiece is sequentially and correctly positioned on the moving path of the stem. , It is possible to perform continuous rivet caulking.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a rivet setting device according to the present invention.

FIG. 2 is a plan view of the rivet setting device according to the present invention.

FIG. 3 is an enlarged front view in which a part in the vicinity of a work holding unit is cut away to form a cross section.

FIG. 4 is an enlarged plan view of a main part in which a part of a caulking unit is sectioned.

FIG. 5 is an enlarged partial cutaway sectional view of a main part of the caulking unit.

6 is a cross-sectional view taken along line AA of FIG.

FIG. 7 is an enlarged partial cutaway sectional view of a main part showing the vicinity of a roll set.

8A is a plan view of a work, and FIG. 8B is a side view of the work viewed from the direction of arrow Y3 in FIG.

FIG. 9 is an explanatory diagram of a conventional example.

FIG. 10 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Riveting apparatus 100 Work holding unit 120 Slide table 150 Lifting table 170 Index table 300 Caulking unit 350 Stem 370 Chuck unit 372 Chuck jaw 470 Anvil 480 Pilot pin

Claims (4)

[Claims] 1. A stem which is held horizontally and which can reciprocate in the axial direction under the driving of a reciprocating drive source, and a stem provided opposite to the stem and which is associated with the reciprocating movement of the stem. A riveting machine comprising: an anvil for caulking a rivet. 2. A stem which is held horizontally and which can reciprocate in the axial direction under the driving of a reciprocating drive source, and a stem which is provided opposite to the stem and which is associated with the reciprocating movement of the stem. A riveting machine comprising: an anvil for caulking a rivet with a work piece; and a work holding unit that moves to place a work between the stem and the anvil. 3. The rivet setting machine according to claim 2, wherein the work holding unit includes an index table capable of rotating the held work at a predetermined angle. 4. The work holding unit according to claim 2, further comprising: an index table capable of rotating the held work at a predetermined angle, and a clamp for holding the work at a predetermined position on the index table. Riveting machine described in.