JP2009255254A - Press-fitting device and press-fitting method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press-fitting device capable of accurately press-fitting numerous kinds of press-fitting components without deteriorating the work efficiency of a press-fitting operation, and a press-fitting method using the press-fitting device. <P>SOLUTION: The press-fitting device 1 for press-fitting a press-fitting component 2 to a press-fitted component 3 by making use of ultrasonic vibration comprises a main body 10 capable of moving to the press-fitted component 3, an ultrasonic generation section 11 arranged on the main body 10 and generating ultrasonic vibration, and a press-fitting head 12 for transmitting the ultrasonic vibration generated by the ultrasonic generation section 11 to the press-fitting component 2 and press-fitting the press-fitting component 2 to the press-fitted component 3 by moving the main body 10. A first contact surface 15 and a second contact surface 16 wherein a peripheral edge is inclined in an axis center S direction of the press-fitting head 12 as it progresses in a direction of an end are formed on a pointed head 12b of the press-fitting head 12, and at least either of contact surfaces 15, 16 is brought into contact with a peripheral edge 20a of a through-hole 20 formed at the press-fitting component 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  Conventionally, many techniques have been proposed for press-fitting devices for press-fitting a press-fitting part such as a valve seat into a press-fitted part such as a cylinder head or a cylinder block of an automobile. Usually, such a press-fitting device is provided with a main body portion that is movable with respect to the press-fit component, and a press-fit head that press-fits the press-fit component into the press-fit component as the main body portion moves.

  In recent years, for example, as disclosed in Patent Document 1 or Patent Document 2, an ultrasonic press-fitting device that press-fits while transmitting ultrasonic vibration to a press-fitted component has been proposed (Patent Document 1 or Patent). Reference 2). In such a press-fitting device using ultrasonic vibration, an ultrasonic generator for generating ultrasonic vibration is separately provided, and the ultrasonic vibration generated from the ultrasonic generator is applied to a press-fitting component via a press-fitting head. The press-fitted part is press-fitted into the press-fitted part in a state where the press-fitted part is vibrated at high speed. With this configuration, the ultrasonic press-fitting device can prevent the press-fitting component and the press-fitted component from being damaged, and can reduce the press-fitting load when press-fitting the press-fitting component. It can be configured simply, for example, by lowering.

  By the way, the conventional press-fitting device described above is configured such that the press-fitting head is moved in a state where the press-fitting part is attached to the tip of the press-fitting head, so that the press-fitting part is press-fitted into the attachment part of the press-fitting part. Therefore, a plurality of press-fitting heads having different tip shapes according to the shape of the corresponding press-fitting component (through hole thereof) have been used.

Therefore, in the conventional press-fitting device, when multiple types of press-fitting parts are pressed into one press-fitted part, the shape of the tip is matched to the shape of the corresponding press-fitted part (through hole) each time. Therefore, it is necessary to replace the press-fitting head with a different one, and the work efficiency of the press-fitting work is poor.
In addition, since the press-fit component is attached to the press-fit head, it is press-fit into the press-fit component, and the center of the press-fit head tilts or deviates from the press-fit direction due to uncertain fluctuations such as disturbances and design errors. In such a case, there is a problem that a press-fitting failure such as a gap is generated between the press-fitted component and the press-fitted component.

  On the other hand, as a configuration of a conventional press-fitting device, for example, as disclosed in Patent Document 3, a holding portion that holds a press-fitting component is provided at the tip of the press-fitting head, and the holding portion is advanced and retracted with respect to the center line. A configuration is known that is provided with an engaging claw that can be freely held and retained on the inner peripheral surface of a cylindrical press-fitting component (see Patent Document 3). According to such a configuration, the engaging claw is moved forward and backward in the holding portion, so that the engaging claw can be locked to the inner surface of the holding hole formed in the press-fitting part and the press-fitting part can be held. A plurality of types of press-fitting parts with different hole diameters (bore diameters) can be accommodated.

However, as disclosed in Patent Document 3, in the configuration in which the inner surface of the holding hole of the press-fitting component (or the outer surface of the press-fitting component itself) is held by a nail or the like in the holding portion, ultrasonic vibration is generated in the press-fitting component. When applied, backlash occurs between the holding part and the press-fit component due to ultrasonic vibration, and the frequency and amplitude of the ultrasonic vibration cannot be reliably transmitted to the press-fit component, reducing the press-fit load. There has been a problem that the effect peculiar to this device that can be performed cannot be achieved.
JP 2003-311553 A JP 2007-21626 A JP 2000-117561 A

  Therefore, the present invention relates to a press-fitting device and a press-fitting method using the press-fitting device, and solves the above-described conventional problems, and press-fitting a plurality of types of press-fitting parts with high accuracy without reducing the work efficiency of press-fitting work. An object is to provide an apparatus and a press-fitting method using the same.

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

  That is, in claim 1, a press-fitting device that press-fits a press-fit component into a press-fit component using ultrasonic vibration, the main body portion being movable relative to the press-fit component, and the main body portion, An ultrasonic generator that generates ultrasonic vibrations, and the ultrasonic vibration generated by the ultrasonic generators are transmitted to the press-fitting parts, and the press-fitting parts are press-fitted into the press-fitted parts by moving the main body part. A press-fit head, and a plurality of abutment surfaces having a peripheral edge inclined toward the axial center of the press-fit head are formed at a distal end portion of the press-fit head toward the end direction. Of these, at least one of the contact surfaces is in contact with the peripheral edge portion of the through hole formed in the press-fitting part.

  According to a second aspect of the present invention, the plurality of contact surfaces are juxtaposed in the axial center direction of the press-fitting head, and the contact surface located on the end side of the press-fitting head has a smaller diameter.

  According to a third aspect of the present invention, the contact surface is formed to be a convex curved surface with respect to the peripheral edge portion of the through hole formed in the press-fitting part.

  According to a fourth aspect of the present invention, the contact surface is formed such that the contour shape of the cut surface along the axial center of the press-fitting head is an arc shape.

  According to a fifth aspect of the present invention, the contact surface is formed to be a tapered surface.

  According to a sixth aspect of the present invention, a press-fitting device using a press-fitting device having a main body unit including an ultrasonic wave generation unit that generates ultrasonic vibrations and a press-fitting head that protrudes from the main body unit, and using ultrasonic vibrations. A press-fitting method for press-fitting a press-fitting component into the press-fitting component, the moving step of moving the main body with respect to the press-fitted component, the generating step of generating ultrasonic vibration by the ultrasonic generator, and the ultrasonic generator A press-fitting step of transmitting the generated ultrasonic vibration to the press-fitting part, bringing a press-fitting head into contact with the press-fitting part by moving the main body, and press-fitting the press-fitting part into the press-fitted part; In the press-fitting process, at least one of a plurality of contact surfaces formed so that the peripheral edge is inclined toward the axial center of the press-fitting head toward the end of the press-fitting head. Press-fit the contact surface It is intended to abut the peripheral edge of the drilled holes in goods.

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

  Since it was set as the structure shown in Claim 1, it can press-fit a multiple types of press-fit components accurately, without reducing the working efficiency of press-fit work.

  Since it is set as the structure shown in Claim 2, even if it is the contact surface located on the opposite side to the edge part side of a press-fit head, it can be made to contact | abut reliably to the peripheral part of the through-hole of press-fit components.

  Since it is set as the structure shown in Claim 3, even if it is a case where a center shift | offset | difference or inclination arises in a press-fit head, a contact surface can be made to line-contact with the peripheral part of the through-hole of a press-fit component, and press-fit components are made more It can be press-fitted with high accuracy.

  Since it is set as the structure shown in Claim 4, the site | part contact | abutted with the peripheral part of a through-hole in each contact surface is expanded, and the kind of press-fit component which can respond can be increased.

  Since the structure shown in claim 5 is adopted, even if the press-fitting head is misaligned or inclined, the contact surface can be brought into contact with the peripheral edge of the through-hole of the press-fitting component, and the press-fitting component It can be press-fitted with high accuracy.

  With the configuration shown in claim 6, it is possible to press-fit a plurality of types of press-fitting parts with high accuracy without reducing the work efficiency of the press-fitting work.

Next, the best mode for carrying out the invention will be described.
1 is a side view showing the overall configuration of a press-fitting device according to a first embodiment of the present invention, FIG. 2 is a side view of the press-fitting head, FIG. 3 is a longitudinal sectional view of the press-fitting head, and FIG. FIG. 5 is a side view showing a state in which the peripheral edge of the through hole of the press-fit component is in contact with each contact surface, FIG. 5 is a diagram showing the relationship of the diameter of the through-hole of the press-fit component to the diameter of the contact surface, and FIG. FIG. 7 is a longitudinal sectional view of the press-fitting head of the third embodiment, and FIG. 7 is a longitudinal sectional view of the press-fitting head of the third embodiment.

First, the overall configuration of the press-fitting device 1 of this embodiment will be outlined below.
As shown in FIG. 1, the press-fitting device 1 according to the present embodiment is a device that press-fits the press-fitting component 2 into a mounting portion 30 formed in the press-fitted component 3, and transmits ultrasonic vibration to the press-fitting component 2. However, it is configured as an ultrasonic press-fitting device for press-fitting into the press-fit component 3. Specifically, the press-fitting device 1 includes a main body 10 that is movable with respect to the press-fit component 3, an ultrasonic generator 11 that is provided in the main body 10 and generates ultrasonic vibrations, and an ultrasonic generator 11. And the press-fitting head 12 that press-fits the press-fitting part 2 into the press-fitting part 3 by the movement of the main body 10.

  In addition, as the press-fit component 2, an annular work such as a valve guide that is an aluminum cast product is used. In the press-fitting component 2 of the present embodiment, a through hole 20 that is opened in a circular shape in plan view is formed in a substantially central portion. As will be described later, a contact surface formed on the press-fitting head 12 during press-fitting. Any one of the contact surfaces 15 and 16 is contacted to the peripheral edge portion 20a of the through hole 20 (see FIG. 4).

  The press-fitting part 3 has a mounting portion 30 into which the press-fitting part 2 is press-fitted. The attachment portion 30 is opened on the surface of the press-fit component 3, and the press-fit component 2 formed so as to substantially match the shape of the attachment portion 30 is press-fitted from the opening portion. When the press-fitting component 2 is press-fitted, the center line of the through-hole 20 of the press-fitting component 2 and the center line of the mounting portion 30 are positioned so as to substantially coincide with each other at the center line S1.

Next, each configuration of the press-fitting device 1 will be described in detail below.
As shown in FIGS. 1 and 2, the main body 10 is configured to be movable in the vertical direction (arrow direction in FIG. 1) with respect to the press-fit component 3 by a press-fit actuator 13. An ultrasonic generator 11 is provided inside the main body 10, and a press-fitting head 12 is attached to the end. As the press-fitting actuator 13, a hydraulic cylinder, an air cylinder, a mechanical electric motor, or the like is used.

  The ultrasonic generator 11 includes an ultrasonic oscillator (element) that converts electrical energy into high-frequency ultrasonic mechanical vibration, and is connected to one end of the press-fitting head 12 by a bolt 14. With such a configuration, in the press-fitting device 1, the ultrasonic vibration generated by the ultrasonic transducer of the ultrasonic generator 11 is transmitted to the press-fitting head 12, and the press-fitting head 12 is moved in the length direction (or width). Direction) at a predetermined frequency. Further, in the ultrasonic wave generation unit 11, the frequency of ultrasonic vibration generated according to the type and shape of the press-fit component 2 and the press-fit component 3 are appropriately adjusted.

  The press-fitting head 12 is formed in a rod shape having a substantially circular cross section, and has a substantially cylindrical body portion 12a whose one end is connected to the ultrasonic wave generating portion 11 of the main body portion 10, and a peripheral portion toward the end portion. Is composed of a tip portion 12b formed with a plurality of contact surfaces 15 and 16 inclined in the direction of the axis center S of the press-fitting head 12. The press-fitting head 12 of this embodiment is formed of a titanium alloy or the like as a material, and the ultrasonic vibration generated by the ultrasonic wave generation unit 11 is amplified while reaching the front end part 12 b of the press-fitting head 12.

Here, the shape of the press-fitting head 12 will be described in detail below.
As shown in FIGS. 2 to 4, the press-fitting head 12 of this embodiment is attached with one end connected to the ultrasonic wave generator 11 and protruding from the end face of the main body 10. The ultrasonic vibration generated by the ultrasonic generator 11 is transmitted to the press-fitting component 2 through the body 12a and the tip 12b. Further, the first contact surface 15 and the second contact surface 16 whose peripheral portions are inclined in the direction of the axis center S of the press-fitting head 12 as they go in the end direction are continuous with the tip portion 12b of the press-fitting head 12. Is formed.

  The body portion 12a is formed in a substantially circular cross section, and with a predetermined protruding length along the press-fitting direction (arrow direction in FIG. 2) from the end surface of the main body portion 10 with the press-fitting head 12 attached to the main body portion 10. It is protruding. The press-fitting head 12 of this embodiment has a reduced rigidity compared to the case where it is provided in a conventional press-fitting device such as a hydraulic press, because the press-fitting device 1 is configured as an ultrasonic type. The bending strength and the bending strength are reduced in the body portion 12a. Therefore, the press-fitting head 12 is bent or bent so as to follow the press-fitting direction by ultrasonic vibration when the press-fitting part 2 is press-fitted by the barrel part 12a projecting with a predetermined projecting length.

  The front end portion 12b is formed at the end portion of the body portion 12a protruding from the main body portion 10, and is formed in a substantially circular cross section like the body portion 12a. A plurality of contact surfaces 15 and 16 having a peripheral edge inclined in the direction of the axis center S of the press-fitting head 12 are formed continuously at the tip end portion 12b. At least one of the contact surfaces 15 and 16 is in contact with the peripheral edge 20a of the through hole 20 formed in the press-fitting part 2 (see FIG. 4). Specifically, the front end portion 12b of the present embodiment has a first contact surface 15 on the side close to the main body portion 10 (main body portion side) and on the side close to the end portion of the press-fitting head 12 (end portion side). Second contact surfaces 16 are respectively formed.

  The first contact surface 15 and the second contact surface 16 that are juxtaposed in the axial center S direction of the press-fit head 12 are each convex with respect to the peripheral edge portion 20a of the through-hole 20 formed in the press-fit component 2. The curved surface is formed. As described above, since the through hole 20 of the press-fitting component 2 is opened in a circular shape in plan view, the first contact surface 15 and the second contact surface 16 are convex with respect to the peripheral edge portion 20a of the through hole 20. By forming it to be a curved surface, the first contact surface 15 and the second contact surface 16 can be brought into contact with the peripheral edge portion 20a of the through hole 20 of the press-fitting component 2 in line contact.

  The first abutting surface 15 is provided on the main body portion side at the distal end portion 12b, and is formed such that the contour shape of the cut surface along the axial center S of the press-fitting head 12 is an arc shape (see FIG. 3). . That is, the first contact surface 15 is formed as a part of an elliptical spherical surface that is continuous with the body portion 12a. On the other hand, the second contact surface 16 is provided on the end side in the distal end portion 12b, and the contour shape of the cut surface along the axial center S of the press-fitting head 12 is an arc shape like the first contact surface 15. (See FIG. 3). That is, the second contact surface 16 is formed as a part of an elliptical spherical surface that is continuous with the first contact surface 15.

  Further, the distal end portion 12 b of the press-fitting head 12 is such that the first contact surface 15 and the second contact surface 16 have a space (diameter R) in the direction perpendicular to the axial center S of the outer peripheral surface of the press-fitting head 12. The diameter R2 of the second contact surface 16 located on the end portion side of the press-fitting head 12 is smaller than the diameter R1 of the first contact surface 15 formed so as to gradually decrease toward the end portion direction. (R1> R2) (see FIG. 2). In the press-fitting head 12 of the present embodiment, the diameter R1 of the first abutment surface 15 and the diameter R2 of the second abutment surface 16 are at least from the diameter dimension (caliber R3) of the through hole 20 of the corresponding press-fitting component 2. Is also formed to be large. Therefore, in the press-fitting head 12, at the time of press-fitting the press-fitting component 2, at least one of the contact surfaces 15 and 16 is brought into contact with the peripheral portion 20 a of the through hole 20 formed in the press-fitting component 2.

  Specifically, the press-fitting head 12 of the present embodiment has a peripheral edge inclined in the axial center S direction of the press-fitting head 12 as the contact surfaces 15 and 16 move toward the end of the press-fitting head 12. If it is the through-hole 20 in the range of the diameter R of each contact surface 15 * 16, it can be used for the press-in operation | work of the some press-fit components 2. FIG. As shown in FIG. 4, in the press-fitting head 12 of the present embodiment, the first contact surface 15 has a diameter R3 of the through hole 20 larger than a diameter R2 of the second contact surface 16 and the first contact surface. This corresponds to the press-fitting component 2 smaller than the diameter R1 of 15 (R1> R3> R2) (see FIG. 4A). On the other hand, the second contact surface 16 corresponds to the press-fitting component 2 in which at least the diameter R3 of the through hole 20 is smaller than the diameter R2 of the second contact surface 16 (R1> R2> R3) (FIG. 4B )reference).

  FIG. 5 shows the relationship between the diameter of the through hole 20 of the press-fitting component 2 and the diameter of the contact surfaces 15 and 16 of the press-fitting head 12. Here, in the present embodiment, the area indicated by the arrow A is the range of the diameter of the through hole 20 that can be handled by the first contact surface 15, and the area indicated by the arrow B is supported by the second contact surface 16. This is a range of the diameter of the possible through hole 20. As a result, the area indicated by the arrow C is the range of the diameter of the through hole 20 that can be accommodated using the press-fitting head 12. Thus, in the press-fitting device 1 of the present embodiment, it is possible to press-fit a plurality of types of press-fitting components 2 having different diameters of the corresponding through holes 20 without replacing one press-fitting head 12.

Next, press-fitting work using the press-fitting device 1 of the present embodiment will be described below.
As shown in FIGS. 1 and 2, in the press-fitting work using the press-fitting device 1 of the present embodiment, the press-fitting part 2 is first arranged in the opening of the attachment part 30 of the press-fitted part 3, and the press-fitting part 2 penetrates. Positioning is performed such that the center line of the hole 20 and the center line of the mounting portion 30 substantially coincide with each other at the center line S1. Next, the main body portion 10 is lowered along the center line S1, that is, with respect to the press-fit component 3 so that the axial center S of the press-fitting head 12 provided on the main body portion 10 is substantially coincident with the center line S1. Moved (moving step). In the main body 10, ultrasonic vibration is generated by the ultrasonic generator 11 (generation process), and the ultrasonic vibration generated by the ultrasonic generator 11 is transmitted to the press-fitting head 12.

  When the main body 10 is moved downward, the press-fitting head 12 is brought into contact with the press-fitting component 2 in due course. Here, in the present embodiment, the first contact surface 15 and the second contact surface 15 are arranged so that the peripheral edge portion is inclined in the axial center S direction of the press-fitting head 12 toward the end portion 12b of the press-fitting head 12. An abutment surface 16 is formed, and at least one of the abutment surfaces 15 and 16 abuts against the peripheral edge portion 20a of the through-hole 20 formed in the press-fitting part 2 (see FIG. 4). .

  Specifically, when the press-fitting component 2 having the diameter R3 of the through hole 20 larger than the diameter R2 of the second contact surface 16 and smaller than the diameter R1 of the first contact surface 15 is used, The surface 15 is brought into contact with the peripheral edge portion 20a of the through hole 20 of the press-fitting component 2 (see FIG. 4A). Further, when the press-fit component 2 having at least the diameter R3 of the through hole 20 smaller than the diameter R2 of the second contact surface 16 is used, the peripheral edge portion of the through-hole 20 of the press-fit component 2 to which the second contact surface 16 is applied. 20a (see FIG. 4B).

  In this way, any one of the contact surfaces 15 and 16 is brought into contact with the peripheral edge portion 20a of the through-hole 20 of the press-fitting component 2, so that the ultrasonic vibration generated by the ultrasonic generator 11 is caused to occur by the press-fitting head 12. It is transmitted to the press-fitting part 2 via. In this state, the main body 10 is moved downward, so that the press-fitting component 2 is press-fitted into the attachment portion 30 of the press-fitted component 3 (press-fitting process).

  As described above, in the press-fitting device 1 according to the present embodiment, the press-fitting device 1 press-fitting the press-fitting component 2 into the press-fitting component 3 using ultrasonic vibration, and the main body movable with respect to the press-fitting component 3. Unit 10, ultrasonic generator 11 provided in main body unit 10 for generating ultrasonic vibrations, and ultrasonic vibrations generated by ultrasonic generator unit 11 are transmitted to press-fit component 2, and main body unit 10 is moved. As a result, a press-fitting head 12 for press-fitting the press-fitting component 2 into the press-fitted component 3 is provided, and the tip portion 12b of the press-fitting head 12 has a peripheral portion as the axis of the press-fitting head 12 toward the end portion. A first abutting surface 15 and a second abutting surface 16 that are inclined in the center S direction are formed, and at least one of the abutting surfaces 15 and 16 is formed in the peripheral portion of the through hole 20 formed in the press-fitting part 2. Since it is configured to abut against 20a, Without reducing the work efficiency of the work, a plurality of types of press-fitting part 2 can be accurately pressed.

  That is, the press-fitting device 1 according to the present embodiment has a first abutting surface 15 and a first contact surface 15 whose peripheral part is inclined toward the axial center S direction of the press-fitting head 12 toward the end part 12b of the press-fitting head 12 in the direction of the end part. Two contact surfaces 16 are formed, and at least any one of the contact surfaces 15 and 16 is configured to be in contact with the peripheral edge portion 20a of the through hole 20 formed in the press-fitting part 2. If the diameter of the through hole 20 is within the range of the diameter R of the first contact surface 15 and the second contact surface 16, a plurality of types of press-fitting parts 2 can be handled. As described above, since the trouble of replacing the press-fitting head 12 having a different shape of the tip 12b in accordance with the press-fitting component 2 can be saved, the work efficiency of the press-fitting work can be improved. Moreover, by setting it as this shape, the frequency and amplitude of an ultrasonic vibration can be reliably transmitted to the press-fit component 2, and the press-fit component 2 can be press-fitted reliably.

  In particular, in the press-fitting work, the axial center S of the press-fitting head 12 with respect to the center line S1 passing through the center of the through-hole 20 and the mounting part 30 of the press-fitting part 2 due to uncertain fluctuations such as disturbance of the main body 10 and design errors. In some cases (hereinafter referred to as “center misalignment”) or the axis center S of the press-fitting head 12 may be tilted (hereinafter referred to as “tilt”). In the press-fitting device 1 according to the present embodiment, even when the press-fitting head 12 is misaligned or tilted as described above, when the press-fitting component 2 is press-fitted, the press-fitting head 12 is pressed by the ultrasonic vibration as described above. The first abutment surface 15 or the second abutment surface 16 (at least a part of the first abutment surface 15 or at least a part of the second abutment surface 16 is lined with the peripheral edge portion 20a of the through-hole 20 of the press-fitting part 2 as well as the bending and bending. Therefore, misalignment and inclination of the press-fitting head 12 are automatically corrected, and the press-fitting component 2 can be reliably press-fitted.

  In the present embodiment, the first contact surface 15 and the second contact surface 16 are arranged in parallel in the axial center S direction of the press-fitting head 12, and are the contact surfaces located on the end side of the press-fitting head 12. The diameter R becomes smaller by about 15 · 16, that is, the diameter R2 of the second contact surface 16 located on the end side of the press-fitting head 12 is smaller than the diameter R1 of the first contact surface 15. Therefore, even the first contact surface 15 located on the side opposite to the end portion side of the press-fitting head 12 can be reliably brought into contact with the peripheral portion 20a of the through-hole 20 of the press-fit component 2. .

  Further, the first contact surface 15 and the second contact surface 16 are formed so as to be convex curved surfaces with respect to the peripheral portion 20a of the through-hole 20 formed in the press-fitting component 2. Even when the head 12 is misaligned or inclined, the first contact surface 15 or the second contact surface 16 can be made to contact the entire periphery of the peripheral edge portion 20a of the through hole 20 of the press-fitting component 2, The press-fitting component 2 can be press-fitted with higher accuracy.

  In particular, in the present embodiment, the first contact surface 15 and the second contact surface 16 are formed so that the contour shape of the cut surface along the axial center S of the press-fitting head 12 is an arc shape. The part of the contact surface 15 or 16 that is in contact with the peripheral edge 20a of the through hole 20 is enlarged, and the types of press-fit parts that can be handled can be increased.

  Note that the configuration of the press-fitting device 1 of the present embodiment is not limited to the above-described configuration, and various modifications can be made without departing from the object of the present invention.

  That is, in the above-described embodiment, the axial center S of the press-fitting head 12 is such that the contact surfaces 15 and 16 are curved surfaces that are convex with respect to the peripheral portion 20a of the through-hole 20 formed in the press-fitting component 2. However, the shape of the press-fit head 12 is not limited to this.

  For example, as in the second embodiment shown in FIG. 6, as the shape of the press-fitting head 112, the contact surfaces 115 and 116 are convex with respect to the peripheral portion 20 a of the through hole 20 formed in the press-fitting part 2. The contour shape of the cut surface along the axial center S of the press-fitting head 12 may be formed in an R surface shape so as to be a curved surface. In such a case, the first abutment surface 115 and the second abutment surface 116 are formed by chamfering a peripheral portion of a circular cylinder having a substantially circular cross section into an R surface shape. In the second embodiment, the diameters R of the contact surfaces 115 and 116 are formed so that the diameters become smaller as they are located closer to the end of the press-fitting head 12 (not shown).

  Further, as in the third embodiment shown in FIG. 7, the press-fitting head 212 may be formed to have a contact surface 215 or 216 taper surface. That is, in the third embodiment, the first contact surface 215 and the second contact surface 216 are formed so that the contour shape of the cut surface along the axial center S of the press-fitting head 212 is a tapered surface. The angle formed with the axial center S of the press-fitting head 212 is increased as the position is closer to the end of 212. Even if the press-fitting head 212 is formed in such a shape, or if the press-fitting head 212 is misaligned or inclined, the contact surfaces 215 and 216 are connected to the peripheral edge 20a of the through-hole 20 of the press-fitting component 2. The press-fitting component 2 can be press-fitted with higher accuracy.

  Further, in the above-described embodiment, the press-fit head 12 is formed with two contact surfaces 15 and 16 having different diameters. However, the number of the contact surfaces 15 and 16 formed on the distal end portion 12b of the press-fit head 12 is not limited. Is not particularly limited. Further, the contact surfaces 15 and 16 are not necessarily formed as continuous surfaces as in the above-described embodiment, and may be formed as non-continuous surfaces as shown in the second embodiment, for example ( (See FIG. 6).

  As described above, the shape of the press-fitting component 2 that can be used in the press-fitting device 1 of the present embodiment is not limited to the annular work such as a valve guide, and at least the through-hole 20 is formed. Any shape can be used as long as the contact surfaces 15 and 16 of the press-fitting head 12 can contact the peripheral edge 20a.

The side view which showed the whole structure of the press injection apparatus which concerns on 1st Example of this invention. The side view of a press-fit head. The longitudinal cross-sectional view of a press-fit head. The side view which shows the state which the peripheral part of the through-hole of the press-fit component contact | abutted to each contact surface of the press-fit head. The figure which showed the relationship of the aperture diameter of the press-fitting component with respect to the diameter of the contact surface. The longitudinal cross-sectional view of the press-fit head of 2nd Example. The longitudinal cross-sectional view of the press-fit head of a 3rd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-fit apparatus 2 Press-fit part 3 Press-fit part 10 Main body part 11 Ultrasonic wave generation part 12 Press-fit head 12a trunk | drum 12b Tip part 15 1st contact surface 16 2nd contact surface 20 Through-hole 20a Peripheral part

Claims (6)

A press-fitting device for press-fitting a press-fitting component into a press-fitted component using ultrasonic vibration,
A main body movable with respect to the press-fit component;
An ultrasonic generator provided in the main body for generating ultrasonic vibration;
The ultrasonic vibration generated by the ultrasonic generator is transmitted to the press-fitting component, and the press-fitting head press-fitting the press-fitting component into the press-fitted component by moving the main body,
A plurality of contact surfaces whose peripheral edge portions are inclined toward the axial center direction of the press-fitting head as it goes in the end direction are formed at the tip of the press-fitting head,
A press-fitting device, wherein at least one of the abutment surfaces is brought into contact with a peripheral portion of a through hole formed in a press-fitting part.   The plurality of abutting surfaces are arranged side by side in the axial center direction of the press-fitting head, and the diameter of the abutting surface located on the end side of the press-fitting head is smaller. Press-fitting device.   3. The press-fitting device according to claim 1, wherein the contact surface is formed to be a convex curved surface with respect to a peripheral portion of a through-hole formed in the press-fitting component. .   The said contact surface is formed so that the outline shape of the cut surface along the axial center of the said press-fitting head may become circular arc shape. Press-fitting device.   The press-fitting device according to claim 1, wherein the contact surface is formed to have a tapered surface shape. Using a press-fitting device having a main body unit having an ultrasonic wave generator for generating ultrasonic vibrations and a press-fitting head protruding from the main body unit, the press-fitting component is press-fitted into the press-fitted component using ultrasonic vibration. A press-in method,
A moving step of moving the main body relative to the press-fit component;
A generating step of generating ultrasonic vibration by the ultrasonic generator;
A press-fitting process in which the ultrasonic vibration generated by the ultrasonic generator is transmitted to a press-fitting part, and a press-fitting head is brought into contact with the press-fitting part by the movement of the main body part, and the press-fitting part is press-fitted into the press-fitted part. And
In the press-fitting step, at least one of a plurality of contact surfaces formed so that the peripheral edge is inclined toward the axial center of the press-fitting head toward the end of the press-fitting head. A press-fitting method, wherein the abutment surface is brought into contact with a peripheral portion of a through-hole formed in the press-fitting part.

Images