JP2007237365A - Press fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press fitting device capable of effectively reducing a press fitting load of a press fitting component so as to surely transmit ultrasonic vibrations to the press fitting component. <P>SOLUTION: In the press fitting device for press-fitting the press fitting component 2 to a press-fitted object by making use of ultrasonic vibrations, the press fitting device comprises an ultrasonic wave generation unit for generating ultrasonic vibrations, a press fitting head 11 for transmitting the ultrasonic vibrations generated by the ultrasonic wave generation unit to the press fitting component 2, and a retaining section 5 which is mounted on a pointed head of the press fitting head 11 and retains the press fitting component 2. The retaining section 5 provides a shaft section 50 projected on the end face 11a of the press fitting head 11, and contact sections 51 and 52 which are mounted on the outer peripheral surface of the shaft section 50 and are formed by an elastic member. The shaft section 50 is inserted into a retaining hole 20 drilled on the press fitting component 2, and the contact sections 51 and 52 retain the press fitting component 2 while the contact sections 51 and 52 are pushed to the internal surface 20a of the retaining hole 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press-fitting device, and more particularly, to a technology of a press-fitting device and a method for press-fitting a press-fitting component into a press-fitting object using ultrasonic vibration.

  Conventionally, in a press-fitting process for press-fitting a press-fitting part such as a bubble guide into a press-fitting object such as a cylinder head or a cylinder block of an automobile, a press-fitting device that holds the press-fitting part and press-fitting into the press-fitting part is provided. Many techniques relating to such press-fitting devices have been proposed so far. In the conventional press-fitting device, with respect to the structure of the holding part for holding the press-fitted component, a configuration in which the outer wall of the press-fitted component is gripped from the outside, or a grip provided so as to be in contact with the inner peripheral surface of the press-fitted component A configuration in which a press-fitting part is gripped from the inside by a member is known.

For example, Patent Document 1 is a press-fitting device for press-fitting a cylindrical press-fitting part into a press-fitted object, and includes a holding part that holds the press-fitting part, and the holding part can be moved forward and backward with respect to the center line. The structure which provided the engaging claw which latches and hold | maintains to the inner peripheral surface of cylindrical press-fit components is disclosed (refer patent document 1). In this press-fitting device, the engaging claw is moved forward and backward in the holding portion, so that the engaging claw is engaged with and held by the inner side surface of the holding hole formed in the press-fitting part. . Then, the press-fitting part is press-fitted into the attachment part of the press-fit object while the press-fitting part is held in the holding part.
JP 2000-117561 A

  Incidentally, in recent years, regarding such a press-fitting device, there has been proposed an ultrasonic press-fitting device that performs press-fitting while transmitting ultrasonic vibration to a press-fitting component. In the press-fitting device using ultrasonic vibration, an ultrasonic generator that generates ultrasonic waves is separately provided, and the ultrasonic vibration generated from the ultrasonic generator is transmitted to the above-described holding unit so that the press-fitted parts are transferred. This is pressed into a press-fit object in a state of being vibrated at high speed. According to such a press-fitting device, it is said that the press-fitting load when the press-fitting parts are press-fitted can be effectively reduced.

  However, in the press-fitting device using ultrasonic vibration, as disclosed in Patent Document 1 described above, in the holding portion, the inner surface of the holding hole of the press-fitting component (or the outer surface of the press-fitting component itself) is clawed or the like. In a configuration in which gripping is performed, when ultrasonic vibration is applied to the press-fitted part, rattling occurs between the holding portion and the press-fitted part due to the ultrasonic vibration, and the frequency and amplitude of the ultrasonic vibration are applied to the press-fitted part. In some cases, it is not possible to reliably transmit the pressure and the effect peculiar to this device that the press-fitting load can be reduced cannot be achieved.

  Therefore, the present invention relates to a press-fitting device that solves the above-described conventional problems, and a press-fitting device that effectively reduces the press-fitting load of a press-fitting component by reliably transmitting ultrasonic vibrations to the press-fitting component. The purpose is to provide.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, there is provided a press-fitting device for press-fitting a press-fitting part into an object to be press-fitted using ultrasonic vibrations, an ultrasonic generator that generates ultrasonic vibrations, and an ultrasonic generator that is generated by the ultrasonic generators. A press-fitting part for transmitting the ultrasonic vibration to the press-fitting part, and a holding part that is attached to the tip part of the press-fitting part and holds the press-fitting part. The holding part protrudes from the end surface of the press-fitting part. A shaft portion to be provided, and a plurality of contact portions attached to the outer peripheral surface of the shaft portion and formed of an elastic member, and the shaft portion is inserted into a holding hole formed in the press-fitting component, The press-fitting component is held in a state where the contact portion is pressed against the inner side surface of the holding hole.

  According to a second aspect of the present invention, at least one contact portion of the holding portion is formed by an O-ring.

  According to a third aspect of the present invention, the holding portion has a holding force on the press-fitting portion side that is larger than that on the distal end side.

  According to a fourth aspect of the present invention, the holding part has a higher hardness of the contact part on the press-fitting part side than on the tip side.

  According to a fifth aspect of the present invention, the holding portion is such that the wire diameter of the contact portion on the press-fitting portion side is larger than that on the distal end side.

  As effects of the present invention, the following effects can be obtained.

  Since the structure shown in claim 1 is adopted, it is possible to prevent generation of backlash between the holding portion and the press-fit component due to vibration, and to reliably transmit ultrasonic vibration to the press-fit component. The load can be effectively reduced.

  Since it was set as the structure shown in Claim 2, the retention strength of the press-fit component by a holding | maintenance part can be improved more, and the press-fit component 2 can be hold | maintained reliably.

  Since it was set as the structure shown in Claim 3, since the press-fit component is held more strongly at the longitudinal direction end portion while being held by the holding portion, it is possible to effectively prevent the press-fit component from rattling or falling off. . Further, the insertion of the shaft portion is not hindered by the contact portion on the distal end side.

  Since it was set as the structure shown in Claim 4, since the press-fit component is held more strongly at the longitudinal end portion side while being held by the holding portion, it is possible to effectively prevent the press-fit component from rattling or falling off. .

  Since it was set as the structure shown in Claim 5, since the press-fit component is more strongly held on the longitudinal direction end side while being held by the holding portion, it is possible to effectively prevent the press-fit component from rattling or falling off. .

Next, the best mode for carrying out the invention will be described.
FIG. 1 is a side view showing an overall configuration of a press-fitting device according to an embodiment of the present invention, FIG. 2 is a side view of a tip portion of a press-fitting head, and FIG. 3 is a side view of a holding unit in a state where press-fitting parts are held. 4 is a side sectional view of the holding portion, FIG. 5 is a side sectional view of the holding portion according to another embodiment, and FIG. 6 is a side sectional view of the holding portion according to another embodiment.

  As shown in FIGS. 1 and 2, the press-fitting device 1 according to the present embodiment is a device that holds and positions a press-fitting component 2 and press-fitting the press-fitting component 2 into a mounting portion 30 formed in the press-fitting object 3. In this embodiment, an ultrasonic press-fitting device that press-fits the press-fit object 3 while transmitting ultrasonic vibrations to the press-fit component 2 is configured. Specifically, the press-fitting device 1 includes a main body 10 in which an ultrasonic generator 4 that generates ultrasonic vibrations is installed, and a press-fitting head 11 that is connected to the main body 10 and positions and holds the press-fitting component 2. The press-fitting actuator 12 and the like that support the main body 10 so as to be movable up and down.

  As the press-fitting component 2, a cylindrical workpiece in which a holding hole 20 as a hollow portion such as a valve seat, a valve guide, or a pipe, which is an aluminum casting product, is formed. The press-fitting component 2 is formed so that the holding hole 20 has a circular cross section, and the press-fitting component 2 is inserted by inserting the holding portion 5 provided in the press-fitting head 11 into the holding hole 20 as will be described later. Is positioned and held. However, the press-fitting component 2 is not limited to a cylindrical workpiece as long as the holding hole 20 is drilled.

  The press-fitting object 3 is provided with a mounting portion 30 where the press-fitting component 2 is press-fitted and attached, and the mounting portion 30 is formed. The press-fitting device 1 is positioned so that the center line and the center line of the mounting part 30 substantially coincide with each other at the center line S1 so that the press-fitting part 2 is securely press-fitted into the mounting part 30. . The press-fit object 3 is positioned and fixed by a table (not shown).

  The main body 10 and the press-fitting head 11 can be moved up and down integrally in the vertical direction with respect to the press-fitted object 3 by a press-fitting actuator 12. Specifically, the press-fitting component 2 held by the press-fitting head 11. The center line of the mounting portion 30 and the center line of the mounting portion 30 are movable in the vertical direction in a state where they are positioned so as to substantially coincide with the center line S1. As the press-fitting actuator 12, a hydraulic cylinder, an air cylinder, a mechanical electric motor, or the like is used.

As described above, the ultrasonic generator 4 that generates ultrasonic vibration is attached to the main body 10, and one end of a press-fitting head 11 is connected to the ultrasonic generator 4 via a bolt 13. Yes. The ultrasonic generator 4 is provided with an ultrasonic oscillator (element) that converts electrical energy into high-frequency ultrasonic mechanical vibration, and the ultrasonic vibration generated by the ultrasonic vibrator is supersonic. It is transmitted from the sound wave generator 4 to the press-fitting head 11, and the press-fitting head 11 is vibrated in the length direction. The press-fitting head 11 is made of a titanium alloy or the like so that the ultrasonic vibration generated by the ultrasonic generator 4 is amplified while reaching the tip.
In addition, the ultrasonic vibration generated in the ultrasonic generator 4 is appropriately changed by the press-fitting component 2 and the press-fit object 3, and in the following embodiment, as an example, the vibration frequency is 15 kHz and the vibration amplitude is 40 μm. Adjusted.

  As shown in FIGS. 4 and 5, a holding portion 5 of the press-fitting component 2 protrudes from one end surface 11 a of the press-fitting head 11, and this holding portion 5 is inserted into the holding hole 20 of the press-fitting component 2. As a result, the press-fitting component 2 is positioned and held by the press-fitting head 11. In the present embodiment, the holding portion 5 includes a substantially cylindrical shaft portion 50 protruding vertically downward from the end surface 11a, and contact portions 51 and 52 attached to the outer peripheral surface of the shaft portion 50. Yes.

  The shaft portion 50 is provided with two groove portions 53 and 54 formed in an annular shape along the outer peripheral surface, and the upper groove portion 53 is provided on the side close to the end surface 11a of the press-fitting head 11 (on the press-fitting head side). However, a lower groove portion 54 is formed in each side of the shaft portion 50 close to the distal end portion (the distal end side). The upper groove portion 53 and the lower groove portion 54 are recessed from the outer peripheral surface of the shaft portion 50 toward the inside. Here, in the present embodiment, the inner groove R1 of the upper groove 53 is formed to be slightly larger than the inner diameter R2 of the lower groove (R1> R2). The shaft portion 50 is chamfered so that the lower end portion 50a is substantially spherical, and the holding portion 5 (shaft portion 50) can be smoothly inserted into the holding hole 20 of the press-fit component 2. .

  The contact portions 51 and 52 are made of an elastic member that is made of a resin material having rubber elasticity and can be attached to the groove portions 53 and 54. In this embodiment, an O-ring that is an annular member having the same shape is used. It has been. The contact portions 51 and 52 are attached to the outer peripheral surface of the shaft portion 50. In this embodiment, the contact portion 51 is attached to the upper groove portion 53 and the contact portion 52 is attached to the lower groove portion 54 in the embodiment. It is inserted from the tip direction of the portion 50 and incorporated in the shaft portion 50. The contact portions 51 and 52 are attached so as not to change in position so as to be in close contact with the inner walls of the groove portions 53 and 54, and the contact portions 51 and 52 (outer surfaces thereof) are circumferentially arranged from the outer peripheral surface of the shaft portion 50. It is attached in a state of protruding outward along.

  Here, as described above, since the inner diameter R1 of the upper groove portion 53 is formed to be larger than the inner diameter R2 of the lower groove portion 54, the contact portions 51. 52, the outer diameter R3 of the contact portion 51 attached to the upper groove portion 53 is slightly larger than the outer diameter R4 of the contact portion 52 attached to the lower groove portion 54 (R3> R4). , And are attached in a state of protruding from the outer surface of the shaft portion 50 rather than the contact portion 52. Further, the outer diameters R3 and R4 of the contact portions 51 and 52 are configured to be larger than the inner diameter R5 of the holding hole 20 of the press-fitting component 2 (R3 and R4> R5).

The mechanism for holding the press-fitting component 2 in the holding part 5 will be described. First, the press-fitting head 11 is moved downward integrally with the main body part 10 by the press-fitting actuator 12. As the press-fitting head 11 moves downward, the holding part 5 is inserted into the holding hole 20 from directly above the press-fitting part 2 placed on a table (not shown). As described above, since the holding portion 5 has the contact portions 51 and 52 incorporated in the groove portions 53 and 54, the contact portions 51 and 52 are located between the inner peripheral surface 20 a of the holding hole 20 and the shaft portion 50. The holding portion 5 is inserted into the holding hole 20 while being elastically deformed so as to be crushed. Then, the downward movement of the press-fitting head 11 is stopped in a state where the end surface 11a is in contact with the upper end of the press-fitting component 2 (see FIG. 2). At this time, the contact portions 51 and 52 crushed between the inner peripheral surface 20a of the holding hole 20 and the shaft portion 50 are subjected to surface pressure in a direction orthogonal to the inner peripheral surface 20a by the restoring force. The press-fitting component 2 is positioned and held by the holding portion 5 by this surface pressure.
In the state where the press-fitting component 2 is held by the holding portion 5, a separation is formed between the inner peripheral surface 20 a of the holding hole 20 of the press-fitting component 2 and the outer peripheral surface of the shaft portion 50 of the holding portion 5. The component 2 and the holding portion 5 (shaft portion 50) are configured not to contact each other.

  When attention is paid to the behavior of the contact parts 51 and 52 when holding the press-fitting part 2 in the holding part 5, when the holding part 5 starts to be inserted into the holding hole 20, the contact part 52 attached to the lower groove part 54 is first held. The contact portion 51 attached to the upper groove portion 53 provided above the contact portion 52 starts to come into contact with the inner peripheral surface 20a. Then, the press-fitting component 2 is attached in such a manner that the inner diameter R3 of the contact portion 51 is slightly larger than the inner diameter R4 of the contact portion 52 and the contact portion 51 protrudes from the outer surface of the shaft portion 50 rather than the contact portion 52. Is held by the holding portion 5, the holding portion 51 is configured so that the holding force (surface pressure) of the press-fitting component 2 based on the restoring force of each of the contact portions 51 and 52 is larger in the contact portion 51.

  In this way, the press-fitting component 2 held by the press-fitting head 11 is in a state in which the ultrasonic vibration generated by the ultrasonic generator 4 is transmitted and the press-fitting object 3 placed on the table (not shown). It is press-fitted into the mounting portion 30 (see FIG. 1).

  As described above, the press-fitting device 1 according to the present embodiment includes the shaft portion 50 and the contact portions 51 and 52 formed by the elastic member attached to the outer periphery of the shaft portion 50 in the holding portion 5. The contact portions 51 and 52 are configured to be pressed between the inner peripheral surface 20a of the holding hole 20 and the shaft portion 50 in a state where the portion 50 is inserted into the holding hole 20 of the press-fitting component 2. Therefore, since the holding part 5 and the press-fitting part 2 are held via the contact parts 51 and 52, when ultrasonic vibration is applied to the press-fitting part 2, the vibration between the holding part 5 and the press-fitting part 2 is caused by vibration. Thus, the ultrasonic vibration can be reliably transmitted to the press-fitting part 2 and the press-fitting load of the press-fitting part 2 can be effectively reduced.

  Further, since a plurality of contact portions 51 and 52 are provided, the holding portion 5 can be brought into contact with the inner peripheral surface a of the holding hole 20 at a plurality of points, and the press-fitting component 2 can be held more reliably. In the present embodiment, the holding portion 5 is provided with two contact portions 51 and 52 (two groove portions 53 and 54), which are configured to contact the inner peripheral surface 20a of the press-fit component 2, For example, the number of contact portions may be increased. It is preferable that the holding part 5 is configured to contact and hold the press-fitting part 2 at at least two places.

Furthermore, since both the contact parts 51 and 52 are formed by O-rings, the holding force of the press-fitting part 2 by the holding part 5 can be further improved, and the press-fitting part 2 can be reliably held. However, the configuration of the contact portions 51 and 52 is not limited to the above-described O-ring, and an annular elastic member such as a D-ring can be used as appropriate within a range that achieves the object of the present embodiment.
In addition, the contact portions 51 and 52 of this embodiment are both formed by O-rings, but at least one (contact portion 51) is formed by an O-ring and the other (contact portion 52) is made of other elasticity. A member such as a square ring or a member made of a plurality of spheres or hemispheres can be used. At least each contact part protrudes from the outer peripheral surface of the axial part 50, Comprising: What is necessary is just a shape which contacts the internal peripheral surface 20a of the press-fit component 2 by a point or a surface.

  In particular, in the present embodiment, in the holding portion 5, by changing the sizes of the inner diameters R <b> 1 and R <b> 2 between the upper groove portion 53 and the lower groove portion 54, the press-fitting head in the holding force of the press-fitting component 2 by the contact portions 51 and 52. The holding force on the side (contact portion 51) is configured to be larger than the holding force on the tip side (contact portion 52). Therefore, in a state where the press-fitting part 2 is held by the holding part 5, the press-fitting part 2 is more strongly held at the end in the longitudinal direction, and rattling or falling off of the press-fitting part 2 can be effectively prevented. Further, when the holding portion 5 is inserted into the holding hole 20 of the press-fitting component 2, it is possible to prevent the contact portion 52 attached to the distal end side of the holding portion 5 from hindering the insertion, and one end portion of the press-fitting component 2. Can be securely inserted until it reaches the end face 11a and can be held.

As another embodiment of the holding portion 5 configured so that the holding force on the press-fitting head side is larger than the holding force on the tip side, for example, in the embodiment shown in FIG. The contact portions 55 and 56 attached to the groove portions 57 and 58 are of the same shape so that the outer diameter R7 is the same. In this embodiment, elastic members having different hardnesses are used as the contact portions 55 and 56. Specifically, the holding portion 5 has a hardness of the contact portion 55 attached to the upper groove portion 57 on the press-fitting head side. It is comprised so that it may become higher than the hardness of the contact part 56 attached to the lower groove part 58 of the front end side.
In the embodiment shown in FIG. 6, members having different wire diameters are used as the contact portions 59 and 60 attached to the groove portions 57 and 58 described above. Specifically, the holding portion 5 of the present embodiment is The wire diameter R8 of the contact portion 59 attached to the upper groove portion 57 on the press-fitting head side is configured to be larger than the wire diameter R9 of the contact portion 60 attached to the lower groove portion 58 on the distal end side.
In any of the configurations shown in FIGS. 5 and 6, the press-fit component 2 is more strongly held at the end portion in the longitudinal direction while being held by the holding portion 5. Prolapse can be effectively prevented.

The side view which showed the whole structure of the press injection apparatus which concerns on one Example of this invention. The side view of the front-end | tip part of a press-fit head. The side view of the holding | maintenance part of the state holding the press-fitting component. The side sectional view of a holding part. The sectional side view of the holding | maintenance part which concerns on another Example. The sectional side view of the holding | maintenance part which concerns on another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-in apparatus 2 Press-in parts 3 Press-fit object 4 Ultrasonic generator (ultrasonic generating part)
5 Holding part 11 Press-fit head (press-fit part)
20 Holding hole 20a Inner side surface 50 Shaft part 51, 52 Contact part

Claims (5)

A press-fitting device for press-fitting a press-fitting part into a press-fit object using ultrasonic vibration,
An ultrasonic generator that generates ultrasonic vibrations;
A press-fitting unit that transmits ultrasonic vibration generated by the ultrasonic generator to a press-fitting component;
A holding part that is attached to the tip of the press-fitting part and holds the press-fitting part;
The holding part is
A shaft portion projecting from the end face of the press-fit portion;
A plurality of attached to the outer peripheral surface of the shaft portion, and a contact portion formed of an elastic member,
A press-fitting device, wherein the shaft part is inserted into a holding hole drilled in the press-fitting part, and the press-fitting part is held in a state where the contact part is pressed against an inner surface of the holding hole.   The press-fitting device according to claim 1, wherein at least one contact portion of the holding portion is formed by an O-ring.   The press-fitting device according to claim 1 or 2, wherein the holding part has a holding force on the press-fitting part side larger than that on the tip side.   The press-fitting device according to claim 2, wherein the holding part has a hardness of the contact part on the press-fitting part side higher than that on a tip side.   The press-fitting device according to claim 2, wherein the holding part has a wire diameter of the contact part on the press-fitting part side larger than that on a tip side.

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