JP4817807B2 - Rotary caulking machine, rotary caulking method - Google Patents

Description

The present invention relates to a rotary caulking machine and a rotary caulking method in which a rotary punch is pressed against and rotated by an upper end surface of a rivet inserted into two workpieces on a table to rotate the two workpieces.
More specifically, the present invention relates to a rotary caulking machine and a rotary caulking method for fastening two workpieces so that swinging around a rivet is possible.

Insert two rivets through the through-holes and place them on the table so that the tool is lowered from above by a predetermined stroke, and the punch at the tip is pressed against the upper end surface of the rivet. In the caulking machine, if there is a variation in the amount of protrusion of the rivet upper end surface from the upper surface of the workpiece, the caulking result also varies.
Japanese Patent Laid-Open No. 7-100575 (Patent Document 1) addresses the unsatisfactory performance caused by the above-mentioned variation by adjusting the lowering amount of the forming tool in accordance with the protrusion amount of the rivet upper end surface from the work surface. Such a technique is disclosed.

  Inserting a rivet into the through hole and placing it on the table and placing it on the table, lower the forming tool from above and rotate the punch at the tip against the upper end surface of the rivet. Japanese Patent Application Laid-Open No. Hei 7-080586 (Patent Document 2) is a technique for detecting the load at the time of caulking of a servo motor for lowering / raising the forming tool and determining whether the caulking is good or not. ).

Japanese Patent Application Laid-Open No. 7-10055. JP-A-7-080586.

The technique described in Patent Document 1 cannot cope with variations in rivet hardness.
That is, even if the lowering amount of the forming tool is adjusted according to the protrusion amount of the rivet upper end surface from the workpiece upper surface, if the rivet hardness varies, the rivet shaft expands in the radial direction by the caulking pressure. Variation in quantity occurs. If the rivet is too soft, the rivet shaft expands in the radial direction due to the caulking pressure and becomes too thick, and as a result, the peripheral surface of the rivet shaft comes into strong pressure contact with the inner wall of the through hole of the workpiece.
Therefore, when the caulking process is intended to fasten the two workpieces so that the swinging with the rivet as an axis is possible, a problem occurs in the swinging.
Further, in the technique described in Patent Document 1, a rivet shaft has a stepped portion. For example, when the lower diameter is relatively thick and the upper diameter is relatively thin, the rivet is used as the shaft. When the purpose is to fasten two workpieces so that they can swing, the lower thick diameter portion is more strongly pressed by the upper thin diameter portion, and as a result, the axial direction further increases. Since it becomes easy to be crushed and the axial length of the thick-diameter portion is further shortened, it becomes more difficult to slide the two workpieces.
In the present invention, there is a variation in the amount of protrusion of the upper end surface of the rivet from the upper surface of the workpiece in the caulking process intended to fasten the two workpieces so that the rivet can be swung. Therefore, even if the rivet hardness varies, and even when the rivet diameter is different between the upper side and the lower side, the object is to enable good fastening.

The present invention is configured as the following [1] to [6].
[1] Configuration 1:
Two pieces of the rivet are pivoted so that they can be swung by rotating the rotary punch against the upper end surface of the rivet that is inserted through the through holes of the two workpieces placed on the table. A rotary caulking machine for fastening workpieces,
A motor controlled to rotate at a constant speed;
A swing mechanism that transmits the rotational force of the motor to the lower workpiece of the two workpieces and swings about the rivet as an axis;
General control means for separating the rotary punch from the upper end surface of the rivet when the force required to swing the lower workpiece reaches a predetermined value;
A rotary caulking machine characterized by comprising:
[2] Configuration 2:
In configuration 1,
The overall control means detects, based on the input voltage of the motor, that the force required to swing the lower workpiece has reached a predetermined value;
Rotary caulking machine characterized by that.
[3] Configuration 3:
In configuration 1,
The overall control means detects a force required for swinging the lower workpiece at each reversal position where the swing direction is reversed.
Rotary caulking machine characterized by that.

[4] Configuration 4:
Two pieces of the rivet are pivoted so that they can be swung by rotating the rotary punch against the upper end surface of the rivet that is inserted through the through holes of the two workpieces placed on the table. A rotary caulking method for fastening a work,
The rotational force of the motor controlled to rotate at a constant speed is transmitted to the lower workpiece of the two workpieces and swung around the rivet as an axis.
When the force required to swing the lower workpiece reaches a predetermined value, the rotary punch is separated from the upper end surface of the rivet.
A rotary caulking method characterized by that.
[5] Configuration 5:
In configuration 4,
Detecting that the force required to swing the lower workpiece has reached a predetermined value based on the input voltage of the motor;
A rotary caulking method characterized by that.
[6] Configuration 6:
In configuration 4,
Detects the force required to swing the lower workpiece at each reversal position where the swing direction reverses.
A rotary caulking method characterized by that.

In the first configuration, the rotary punch is pressed against and rotated on the upper end surface of the rivet formed through the through-holes of two workpieces placed on the table so as to be swingable around the rivet. A rotary caulking machine that fastens two workpieces to each other, the motor being controlled to rotate at a constant speed, and the rotational force of the motor transmitted to the lower workpiece of the two workpieces to pivot the rivet Since the rotary caulking machine has a swinging mechanism that swings and the overall control means that separates the rotary punch from the upper end surface of the rivet when the force required for swinging the lower workpiece reaches a predetermined value, The caulking process can be performed while directly detecting whether or not the workpiece as the shaft can be favorably swung. For this reason, in the caulking process which intends to fasten two workpieces so that the rivet can be swung, not only there is variation in the amount of protrusion of the rivet upper end surface from the upper surface of the workpiece. Even when the rivet hardness varies, good fastening can be performed.
Configuration 2 is a rotary caulking machine according to Configuration 1, wherein the overall control unit detects that the force required to swing the lower workpiece has reached a predetermined value based on the input voltage of the motor. In addition to the function and effect achieved by the configuration 1, it is possible to provide a good technique for detecting that the force required for swinging the lower workpiece has reached a predetermined value.
Configuration 3 is a rotary caulking machine in Configuration 1, wherein the overall control means detects a force required for swinging the lower workpiece at each reversal position where the swing direction is reversed. In addition to the operational effects, it is possible to define a good timing for detecting that the force required to swing the lower workpiece has reached a predetermined value.

  Since the configurations 4 to 6 are methods corresponding to the configurations 1 to 3, respectively, there are effects corresponding to the configurations 1 to 3, respectively.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of a control unit of the rotary caulking machine according to the embodiment. 2A and 2B are schematic views showing the rotary crimping machine of FIG. 1, in which FIG. 2A shows before crimping and FIG. 2B shows when crimping. Moreover, (c) is an arrow C figure of (b). FIG. 3 is a flowchart showing a control procedure of the overall control 10 of FIG.

  The caulking mechanism 23 includes a piston 233 raised / lowered by a cylinder (not shown), a molding tool 231 attached to the lower end of the piston 233, and a rotary punch 230 attached to the tip (lower end) of the molding tool 231. And a rotary caulking unit 232 for rotating the rotary punch 230.

The caulking mechanism 23 is rotated with the tip (lower end) of the rotary punch 230 being in pressure contact with the upper end surface of the rivet W0 (rotating about the extension line of the axis of the rivet W0). This is a mechanism that presses and widens the end face to fasten the work (upper side) W1 and the work (lower side) W2. In this machine, the fastening is performed so that the workpiece W1 and the workpiece W2 can swing around the rivet W0 after the fastening.
Further, in this example, a lower arm and a lifter link, which are components of a mechanism for raising and lowering a vehicle seat, are assumed as the workpiece W1 and the workpiece W2. Here, the mechanism for raising and lowering the automobile seat means that the lifter ring pivotally supported by a rivet on the lower arm on the vehicle floor surface swings with the rivet as a swinging shaft, thereby the other end side of the lifter link. It is a mechanism for raising / lowering the sheet supported by. In this mechanism, the diameter of the shaft of the rivet is relatively thin on the upper side corresponding to the lower arm portion and relatively thick on the lower side corresponding to the lifter link portion. For this reason, if processing is performed with a conventional rotary caulking machine, if the rivet is soft, the axial length of the lower part is more likely to be crushed, and the lower arm and lifter link swing after processing. However, in this apparatus, such a problem is prevented.

The raising / lowering of the piston 233 of the caulking mechanism 23 and the rotation / stopping of the rotary punch 230 by the rotary caulking unit 232 are controlled by the caulking drive control 21 in which the start / end is managed by the overall control 10.
As the caulking mechanism 23 and the caulking drive control 21, a configuration of a known rotary caulking machine can be adopted, and thus further explanation is omitted.

  This rotary caulking machine has a rocking mechanism 34 for rocking the work (lower side) W2 with the rivet W0 as an axis (see FIG. 2C). The swing mechanism 34 is driven by a motor 32 whose speed is controlled by a servo control 30 so that the rotation speed is constant. The mechanism for transmitting the rotational force of the motor that rotates at a constant speed to swing the workpiece W2 can be configured using, for example, a known lever crank mechanism. Since servo control for rotating the motor at a constant speed is well known, description thereof is omitted. Instead of servo control, the motor 32 may be rotated at a constant speed using inverter control.

  The rotary caulking machine detects and monitors the input voltage of the motor 32 by the input voltage detection 36, and when the input voltage exceeds a predetermined value, the caulking process is finished. In other words, the force required to swing the workpiece (lower side) W2 at a constant speed as described above is monitored, and when the force exceeds a predetermined value, the crimping process is terminated. In this way, since the end timing of the crimping process is determined based on the force required to swing the workpiece W2 at a constant speed, the crimping process can be completed when the optimum fastening state is reached. Here, the optimal fastening state refers to a state in which the workpiece W1 and the workpiece W2 are fastened in a swingable manner with the rivet W0 as an axis. In this example, a tightening state in which the lifter link W2 pivotally supported by the lower arm W1 by the rivet W0 can raise and lower the seat smoothly is applicable.

  In the above description, the “force required to swing the workpiece W2 at a constant speed” has been described. However, the workpiece W2 decreases in speed as it approaches the end position of the swing, and then rotates at the end position. After the intermediate position, the speed is decreased again to reach the opposite end position, and the reversing motion is performed again. Accordingly, the “constant speed” means “a constant speed at the same angular position (eg, an intermediate position if it is an intermediate position)”.

  In addition, since the workpiece W2 reciprocates as described above, the input voltage detected at each angular position is equal to the angular position of the reciprocating motion even if the degree of caulking is the same (degree of tightening). Depending on. For this reason, in this example, control is performed as described above based on the input voltage when the workpiece W2 is at each end position, but instead of this, the input voltage when passing through the intermediate position, Or you may make it control based on the average voltage of one period.

  In this embodiment, the input voltage of the motor 30 is detected, and when the input voltage exceeds a predetermined value, the caulking process is finished. However, the force necessary to swing the workpiece W2 at a constant speed. Alternatively, it may be detected, or the force necessary for swinging the workpiece W2 at a constant speed may be detected by another known method and controlled as described above.

The control procedure described above is shown in FIG.
As shown in the figure, when the workpieces W1, W2, and W0 are set at predetermined positions on the table 50 (YES in S01), the descent control of the piston 233 and the rotary caulking unit 232 with respect to the caulking drive control 21. A command to start rotation control of the rotary punch 230 is issued (S11). The precise timing of the descent control and the rotation control is controlled by a caulking drive control 21 according to a known procedure.

Further, the servo control 30 is instructed to start rotation control at a constant speed of the motor 30 (S13). The speed is commanded from the overall control 10. The constant speed rotation of the motor 30 is controlled by a servo control 30 according to a known procedure.
Also, monitoring of the voltage value input from the input voltage detection 36 is started (S15).

If the voltage value input from the input voltage detector 36 exceeds a predetermined value (YES in S21), the piston raising control and the rotary punch 230 stop control are instructed to the caulking drive control 21 in contrast to the above ( S31), the servo control 30 is commanded to stop the motor 32 (S33), and the monitoring of the voltage input from the input voltage detection 36 is terminated (S35).
Thereafter, the process returns to step S01 to prepare for the next workpiece control.

The block diagram which shows the structure of the control part of the rotary crimping machine of embodiment. The rotary caulking machine of an embodiment is shown typically, (a) is the state before the start of caulking processing, (b) is the state at the time of caulking processing, (c) is an arrow C figure of (b). The flowchart which shows the process performed by the integrated control 10 of FIG.

Explanation of symbols

10 Overall Control 21 Caulking Drive Control 23 Caulking Mechanism 230 Rotary Punch 231 Molding Tool 232 Rotary Caulking Unit 233 Piston 30 Servo Control 32 Motor 34 Oscillating Mechanism 36 Input Voltage Detection 50 Table W0 Rivet W1 Workpiece (Upper)
W2 Workpiece (lower side)

Claims (6)

Two pieces of the rivet are pivoted so that they can be swung by rotating the rotary punch against the upper end surface of the rivet that is inserted through the through holes of the two workpieces placed on the table. A rotary caulking machine for fastening workpieces,
A motor controlled to rotate at a constant speed;
A swing mechanism that transmits the rotational force of the motor to the lower workpiece of the two workpieces and swings about the rivet as an axis;
General control means for separating the rotary punch from the upper end surface of the rivet when the force required to swing the lower workpiece reaches a predetermined value;
A rotary caulking machine characterized by comprising: In claim 1,
The overall control means detects, based on the input voltage of the motor, that the force required to swing the lower workpiece has reached a predetermined value;
Rotary caulking machine characterized by that. In claim 1,
The overall control means detects a force required for swinging the lower workpiece at each reversal position where the swing direction is reversed.
Rotary caulking machine characterized by that. Two pieces of the rivet are pivoted so that they can be swung by rotating the rotary punch against the upper end surface of the rivet that is inserted through the through holes of the two workpieces placed on the table. A rotary caulking method for fastening a work,
The rotational force of the motor controlled to rotate at a constant speed is transmitted to the lower workpiece of the two workpieces and swung around the rivet as an axis.
When the force required to swing the lower workpiece reaches a predetermined value, the rotary punch is separated from the upper end surface of the rivet.
A rotary caulking method characterized by that. In claim 4,
Detecting that the force required to swing the lower workpiece has reached a predetermined value based on the input voltage of the motor;
A rotary caulking method characterized by that. In claim 4,
Detects the force required to swing the lower workpiece at each reversal position where the swing direction reverses.
A rotary caulking method characterized by that.

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