JPH081777Y2 - Press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a press-fitting device that press-fits a press-fitted part to a predetermined position of a work after the press-fitting part is received by a supply unit.

(Prior Art) Conventionally, as a press-fitting device for press-fitting a ring-shaped press-fitting part such as a valve seat into a predetermined recessed seat portion of a work, a holding head for holding the press-fitting part is provided,
An apparatus has been adopted in which the holding head is moved by a moving mechanism between a press-fitting component supply unit and a work-pressing unit, so that the press-fitting component chucks at the supply unit and the press-fitting unit is pressed.

(Problems to be solved by the invention) In chucking and press-fitting the press-fitting components as described above, the holding head is moved to a predetermined position with high dimensional accuracy in both chucking and press-fitting. Therefore, unless the press-fitting parts and the work are respectively operated, the press-fitting parts cannot be chucked and press-fitted accurately.For that purpose, it is necessary to secure the control accuracy of the moving mechanism and increase the manufacturing accuracy of each part. It is disadvantageous in terms of cost and has a problem in durability.

Further, in order to absorb the dimensional accuracy as described above, it is possible to install the holding head so as to be able to float in a centripetal state by using an elastic material such as a spring or rubber. There is a problem that it becomes difficult to secure durability while maintaining the centripetal property and the floating function due to a large load acting upon press-fitting.

Therefore, in view of the above circumstances, the present invention has an object to provide a press-fitting device capable of obtaining a centripetal structure and a floating structure of a holding head while maintaining durability against a press-fitting load.

(Means for Solving the Problem) In order to achieve the above object, the press-fitting device of the present invention is capable of moving a holding head, which holds a press-fitting component, in a plane perpendicular to the press-fitting direction with respect to a movable main body that is driven to press-fit. And a movable mechanism that is movable by a predetermined amount in the press-fitting direction, and the moving distance until the movable member and the holding head come into contact is set to be smaller than the movable amount of the floating mechanism in the press-fitting direction. Holding head,
Positioning is performed by a centripetal mechanism including a plurality of pressing members with stoppers directed toward the center, a spring that biases the pressing members in the central direction, and a flat surface portion with which the pressing portion can abut, and the flat surface of the centripetal member is positioned. The length of the portion in the press-fitting direction is set to be movable by a predetermined amount larger than the moving distance until the movable member and the holding head come into contact with each other in the press-fitting direction when the holding head is press-fitted into the pressing member.

(Operation) In the press-fitting device as described above, first, the movable main body moves to the component supply unit, and the holding head is driven in the same direction as the press-fitting direction to hold the press-fitted component at the predetermined supply position, and the tip end thereof is driven. Holds press-fit parts. At that time, even if the center position of the holding head is slightly deviated, the centering mechanism adjusts the centers of the two so that they coincide with each other. After that, the movable main body is moved to the press-fitting portion, the movable main body is driven in the press-fitting direction with respect to a predetermined position of the work, and the press-fitting part held by the holding head is press-fitted. At that time, the pressure input is small at the initial stage of press-fitting, and the holding head moves in a plane perpendicular to the press-fitting direction by a light force by the floating mechanism, so that the center of the press-fitting part and the press-fitted part are aligned by the centripetal mechanism. When the holding head is moved by a predetermined amount in the press-fitting direction with respect to the movable main body due to an increase in the press-fitting load, the holding head comes into contact with the movable main body and is integrally press-fitted, and the press-fitting load is applied to the floating mechanism and the centripetal mechanism. Does not act directly on
Durability is improved.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First
The figure shows the sectional front view of the main part of the press-fitting device.

The press-fitting device 1 includes a movable main body 2 that is driven in a press-fitting direction (axial direction) by a drive mechanism (not shown), and a holding head 3 that holds the press-fitting component W. Further, in the movable main body 2, when the component supply section and the press-fitting section are separated,
A moving mechanism that reciprocates between the two is linked.

The movable body 2 and the holding head 3 are movably connected via a centripetal mechanism 4 and a floating mechanism 5. The centripetal mechanism 4 movably supports the holding head 3 with respect to the movable body 2 in a plane perpendicular to the press-fitting direction A, and is biased to a central position by a mechanism described later. Further, the floating mechanism 5 supports the holding head 3 so as to be movable in the press-fitting direction A with respect to the movable body 2, and the structure to be described later enables movement in each direction with a light force.

An upper part of the movable body 2 is connected to a drive mechanism, and a connecting recess 6 is formed at the center of the lower surface of the support part 2a at the lower end.
On the other hand, the holding head 3 has a head portion 3a for chucking and holding the ring-shaped press-fitted part W at the center of the lower end portion, and a chuck unit 3b for chucking the head portion 3a is provided above the head portion 3a. The chuck unit 3b is installed, and a connecting shaft portion 7 is provided at the center of the upper end of the chuck unit 3b.

The mechanism of the head unit 3a and the chuck unit 3b is
For example, the structure shown in FIG. 3 is adopted. Head
3a has a chuck body 10 that is divided into a plurality of parts in the radial direction and can be expanded. An elevating rod 11 is arranged at the center of this chuck body 10, and a chuck 12 is attached to the center direction by a spring 12 on the outer circumference. It is energized. The elevating rod 11 is linked to the piston rod 14 in the cylinder 13 in the chuck unit 3b, and when the elevating rod 11 is pulled up as the piston rod 14 is moved upward, the taper surface of the lifting rod 11 becomes the chuck body.
By sliding with the taper surface of 10, the chuck body 10 is opened to hold the ring-shaped press-fit component W from the inner peripheral side, and when the descent operation is performed, the chuck body 10 is closed to release the press-fit component W. It is configured.

The connecting shaft portion 7 at the upper end of the holding head 3 is inserted into the connecting recessed portion 6 on the lower surface of the movable body 2, and a predetermined gap is formed between the two, so that the central axes of both can move relatively by a predetermined distance. Is formed in.

In addition, the upper end of the connecting shaft portion 7 and the connecting concave portion 6 of the movable body 2
A gap is provided between the holding head 3 and the bottom portion of the movable body 2, and the holding head 3 is movable in the press-fitting direction A with respect to the movable body 2 by a moving distance until the both contact.

The centering mechanism 4 is formed by the upper portion of the connecting shaft portion 7, and as shown in FIG. 2, the upper portion of the connecting shaft portion 7 has three flat portions 7a formed in a notch shape and movable. The tip of a pressing member 15 with a stopper is engaged with the main body 2 so as to be able to come into contact with each flat surface portion 7a. The pressing amount of the pressing member 15 toward the center is restricted by the stopper 15a at the rear end,
It is set so that the center of the connecting shaft portion 7 is located at the center of the connecting concave portion 6 when the three pressing members 15 are in the most protruding state. Further, a spring 16 for urging the pressing member 15 toward the center is contracted on the back of the pressing member 15. The holding head 3 is connected to the movable body 2 by the engagement of the tip end portion of the pressing member 15 with the flat surface portion 7a, and the length of the flat surface portion 7a is larger than the length of the pressing member 15 in the press-fitting direction A. Thus, the holding head 3 is formed so as to be movable in the press-fitting direction A with respect to the movable body 2 by a predetermined amount. The movement amount is set to be larger than the movement distance at which the upper end portion of the connecting shaft portion 7 and the bottom portion of the connecting concave portion 6 come into contact with each other.

Further, the floating mechanism 5 formed under the connecting shaft portion 7 is interposed between the ball bearing 17 and the plate 18 in a state of being in contact with the upper end surface of the holding head 3 and being held by the retainer 17a. A disc spring 19 is interposed between the back surface of the plate 18 and the lower end surface of the movable body 2. further,
When the holding head 3 moves upward, the upper end portion of the connecting shaft portion 7 abuts the bottom portion of the connecting concave portion 6 of the movable main body 2 before the disc spring 19 reaches the minimum compression state, and further In order to prevent the load from acting on the disc spring 19 and the ball bearing 17, the moving distance at which the upper end portion of the connecting shaft portion 7 and the bottom portion of the connecting concave portion 6 contact each other is set smaller than the deformable amount of the disc spring 19.

In the state of FIG. 1 in which the holding head 3 is suspended on the movable body 2, the plate 18 is moved to the ball bearing 17 by the biasing force of the disc spring 19 in the floating mechanism 5 in the state of FIG. The holding head 3 is pressed and is in a floating state in which it moves in a plane perpendicular to the press-fitting direction A by a light force. Moreover, in the centripetal mechanism 4, the urging force of the spring 16 is stopped by the stopper 15a, and the holding head 3 moves in any direction. It is also supported to move to the center while moving with the same force.

In the above state, the movable main body 2 moves to the component supply section, and the holding head 3 for the press-fitted component W with the chuck body 10 closed.
To descend. The tip of the head portion 3a is inserted into the press-fitted part W, and at that time, even if the center position of the head portion 3a is slightly deviated, the centers of both are inserted by floating movement and the chuck body is actuated by the operation of the cylinder 13. 10 spreads to hold the press-fitted part W. After that, the movable main body 2 is moved to the press-fitting portion, and the movable main body 2 is press-fitted and driven at a predetermined position of the work. In this press-fitting operation, the pressing force is small in the initial stage of press-fitting, the holding head 3 is floatingly moved with a light force, and the position is adjusted so that the press-fitting component W is accurately fitted into the press-fitted portion, and the pressing load increases. When the holding head 3 moves by a predetermined distance with respect to the movable body 2 due to
The upper end surface of the connecting shaft portion 7 is pressed against the bottom surface of the connecting recessed portion 6, and the press-fitting load does not act directly on the ball bearing 17, the disc spring 19, and the pressing member 15, but acts on the contact surface, and press-fitting parts W
Press-fitting is completed.

(Effects of the Invention) According to the present invention as described above, the movable head can move the holding head in the direction perpendicular to the press-fitting direction with a light force, and the centripetal mechanism having the pressing member and the flat portion. It is supported so as to surely return to the center position, and the moving amount of the floating mechanism and the centripetal mechanism in the press-fitting direction is set to be larger than the moving distance until the movable body and the holding head abut and integrally move. As a result, the press-fitting accuracy in press-fitting can be ensured and the durability of these mechanisms can be improved because the press-fitting load does not act on the floating mechanism and the centripetal mechanism.

[Brief description of drawings]

1 is a sectional front view of a main part of a press-fitting device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view showing an example of the internal structure of a chuck unit. It is a figure. 1 ... press-fitting device, 2 ... movable body, W ... press-fitting part, 3
…… Holding head, 3a …… Head part, 3b …… Chuck unit, 4 …… Centering mechanism, 5 …… Floating mechanism, A
...... Press-fit direction, 6 ... Connecting recess, 7 ... Connecting shaft, 7a ...
… Plane, 15 …… Pressing member, 15a …… Stopper, 16 ……
Spring, 17 ... Ball bearing, 19 ... Disc spring.

Claims (1)

[Scope of utility model registration request] 1. A floating head, which holds a press-fitted part, is movable with respect to a movable main body driven by press-fitting in a plane perpendicular to the press-fitting direction, and is movable by a predetermined amount in the press-fitting direction. The moving distance until the movable member and the holding head come into contact with each other is set to be smaller than the movable amount of the floating mechanism in the press-fitting direction, and the movable main body and the holding head are provided with a plurality of pressing members with stoppers directed toward the center. A spring for urging the pressing member toward the center,
The pressing portion is positioned by a centripetal mechanism having a flat portion capable of abutting, and the length of the flat portion of the centripetal mechanism in the press-fitting direction is held by the holding head with the movable member in the press-fitting direction when press-fitting into the pressing member. A press-fitting device, which is set to be movable by a predetermined amount larger than a moving distance until the head comes into contact with the head.