JPH10514A - Jig for shrinkage fit of part having different quality, its method, and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety surely insert a work into a fitting hole, and improve productivity by providing a bottom jig having a mount part and a guide part for a first member, a storage part which stores the first member and pressurizes its top surface, and a top jig having a support part and a rotation hole part for a second member. SOLUTION: The bottom surface 1b of a flange 1 as a first member is mounted on a mount part 13 of a bottom jig 11 under the ordinary temperature and covered with a top jig 12 from the top so that the flange 1 is stored in a storage part 16, and at the same time a rotation hole part 17 is fitted around a guide part 15. Centering of the flange 1, the top jig 12, and the bottom jig 11 are thus completed. The top surface 1a of the flange 1 is pressurized by the inner surface 16a of the storage part 16. Namely, the flange 1 whose top surface 1a and bottom surface 1b are pressurized by the top jig 12 and the bottom jig 11 respectively is thus fixed. Secondly, the outer shape 4 of a work 3 as the second member is fitted in the support part 18 of the top jig 12 so as to be supported vertically in the upper part of the fitting hole 2 and the work 3 is mounted on the flange 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig and a method for continuously heating, inserting and shrink-fitting a jig by holding two parts made of different materials, and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, in order to shrink-fit a ceramic cylindrical work into an aluminum flange having a fitting hole, the flange is heated to a predetermined temperature, and manually inserted into the fitting hole of the flange. After inserting a ceramic work, the flange was cooled.

[0003]

However, in the above operation, the ceramic work is held in the hand and inserted directly into the high-temperature (150 to 200 ° C.) flange, so that the hand touches the high-temperature flange. There is a danger of burns, and the workability of inserting the work into the fitting hole is extremely poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the use of a different material which is highly safe, can reliably insert a work into a fitting hole, and can improve productivity. It is an object of the present invention to provide a jig and a method for shrink-fitting a part and an apparatus therefor.

[0005]

According to a first aspect of the present invention, there is provided a jig having a second member made of a material having a small thermal expansion coefficient inserted into a fitting hole of a first member made of a material having a large thermal expansion coefficient. A jig for supporting a first member and a second member for shrink-fitting a shaft portion of a member, a mounting portion receiving a lower end surface of the first member, and a circular guide portion formed on an outer peripheral portion thereof. A lower jig disposed above the lower jig, a housing portion for housing the first member and pressing the upper end surface thereof, and a second member formed at an upper portion of the housing portion The present invention is characterized in that a supporting portion for vertically supporting the guide member and an upper jig having a rotary hole portion rotatably fitted to the guide portion are provided.

According to a second aspect of the present invention, in the method, a first member made of a material having a large thermal expansion coefficient and a second member made of a material having a small thermal expansion coefficient are mounted on a jig, and the second member is attached to the jig. The shaft of the member is vertically supported above the fitting hole of the first member, and the first and second members are heated together with the jig,
When the inside diameter of the fitting hole of the first member reaches a predetermined temperature that is larger than the outside diameter of the shaft portion of the second member, the first and second members are fitted together.
Vibration is applied to the member and the jig to move the shaft of the second member to the first position.
The first and second members and the jig are cooled after being lowered and inserted into the fitting holes of the member.

According to a third aspect of the present invention, a shaft portion of a second member made of a material having a small thermal expansion coefficient is provided vertically above a fitting hole of a first member made of a material having a large thermal expansion coefficient. The jig and the first and second members which are conveyed, and the jig and the first and second members are heated, and the inner diameter of the fitting hole of the first member is set to the second. A heating unit that reaches a predetermined temperature that is larger than the outer diameter of the shaft of the member, and a vibrator applied to the jig and the first and second members to move the shaft of the second member to the first member. It is characterized in that it has a vibrating part to be lowered and inserted into the fitting hole, and a cooling part to cool the jig and the first and second members.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, a flange 1 as a first member is made of a material having a large thermal expansion coefficient, for example, aluminum, and has an upper end surface 1a and a lower end surface 1b.
Is formed flat, and a fitting hole 2 is formed at the center. Incidentally, a chamfer is formed at the upper end of the fitting hole 2.
The work 3 as a second member is formed in a cylindrical shape from a material having a small coefficient of thermal expansion, for example, a ceramic, and an outer portion 4 as a shaft is shrink-fitted into the fitting hole 2. The outer diameter of the outer portion 4 is slightly larger than the inner diameter of the fitting hole 2 at room temperature.

The jig 10 includes a lower jig 11 and an upper jig 12. These lower jig 11 and upper jig 12
It is preferable that the first member is made of a material having substantially the same thermal expansion coefficient as that of the flange 1. The lower jig 11 has a mounting portion 13 whose upper surface receives the lower end surface 1b of the flange 1, and the work 3 shrink-fitted at the center thereof.
A stopper 14 is formed to receive the lower end surface of. Further, a circular guide portion 15 is formed on the outer peripheral portion of the mounting portion 13.

The upper jig 12 is disposed above the lower jig 11 and has a receiving portion 16 for receiving the flange 1 concentrically.
5 is formed with a rotation hole 17 rotatably fitted thereto. When the rotary hole 17 is fitted into the guide 15, the lower jig 11, the upper jig 12, and the flange 1 are arranged concentrically. Furthermore, the work 3
The support portion 18 to which the outer shape portion 4 is fitted is formed. In this jig 10, at normal temperature, the flange 1 is placed on a lower jig 11, and an upper jig 12 is placed thereon,
In the state where the work 3 is fitted to the support portion 18 and the first and second members are supported, the work 3 is moved between the processes.

FIG. 5 shows an apparatus 20 in which a conveying section 21, a heating section 22, a vibrator 23 as a vibrating section, and an air cylinder 24 are arranged in this order from the left, followed by FIG. A cooling unit 25 is provided. The transport unit 21 is formed of a conveyor, and a plurality of jigs 10, flanges 1, and works 3 loaded on a pallet, for example, are carried in at a start end 21 a shown in FIG. 6. These are sequentially conveyed in the directions of arrows A, B, and C in accordance with the respective steps, and finally, the shrink-fitted product is carried out from the terminal end 21b. Heating unit 2
Reference numeral 2 denotes a so-called tunnel furnace, which can continuously heat while moving the jig 10 on the transport unit 21.

For example, three vibrators 23 as vibrating parts are provided in accordance with the number of jigs 10 conveyed at the same time.
In contrast, the frequency is 15,300 V. P. M, amplitude: 2
mm, for 7 seconds in the vertical and horizontal directions. For example, three air cylinders 24 are arranged above the vibrator 23 and press the heated work 3 at a pressure of ² kgf / cm ^{2 at} a speed of 1 m / sec for 1 second. The pressurizing condition of the vibrator 23 and the air cylinder 24 is not limited to the above, and may be appropriately selected according to the situation. The cooling unit 25 includes a cool air device (not shown),
The jig 10, the flange 1, and the work 3 after the insertion process is completed
Is cooled and shrink-fitted.

Next, a procedure for shrink-fitting the outer portion 4 of the work 3 into the fitting hole 2 of the flange 1 will be described. (1) At normal temperature, the lower end surface 1b of the flange 1 is mounted on the mounting portion 13 of the lower jig 11. (2) Cover the upper jig 12 from above the flange 1, accommodate the flange 1 in the accommodating portion 16, and fit the rotating hole portion 17 into the guide portion 15. Thereby, the centering of the flange 1 and the upper jig 12 and the lower jig 11 is completed. The upper end surface 1 a of the flange 1 is pressed against the inner surface 16 a of the housing 16. That is, the flange 1 has the upper end surface 1a and the lower end surface 1b pressed and fixed by the upper jig 12 and the lower jig 11, respectively. Then, the upper jig 12 and the lower jig 1
A slight gap is formed on the surface facing 1 (FIG. 2).
reference).

(3) Next, the support portion 18 of the upper jig 12
Then, the external portion 4 of the work 3 is fitted to the work 3 to support the work 3 vertically above the fitting hole 2. In this case, the outer part 4
Is slightly larger than the inner diameter of the fitting hole 2 at room temperature, so that the lower end of the work 3 rests on the peripheral edge of the fitting hole 2.

(4) As shown in FIGS. 5 and 6, a plurality of, for example, three jigs 10 on which the flange 1 and the work 3 are mounted are stacked on a pallet and sequentially placed on the transport unit 21. Is sent in the direction of arrow A. Then, it is heated to 150 to 200 ° C. by a heating unit 22 such as a tunnel furnace.
Since the coefficient of thermal expansion of the flange 1 is larger than the coefficient of thermal expansion of the work 3, the dimensional difference between the fitting hole 2 and the outer part 4 becomes smaller as the temperature rises. When 1 is heated to a predetermined temperature, the inside diameter of the fitting hole 2 becomes slightly larger than the outside diameter of the external part 4.

(5) When the heating is completed, the flange 1, the work 3, and the jig 10 are transferred onto the vibrator 23, where the frequency is 15,300V. P. M, amplitude:
A vibration of 2 mm is applied in the vertical and horizontal directions for 7 seconds. As a result, a circumferential force acts on the upper jig 12 and the work 3, and the work 3 rotates along the rotation hole 17. In accordance with the rotation of the work 3, a centering action on the fitting hole 2 is applied to the outer portion 4, and the work 3 is sequentially lowered by its own weight due to the vertical vibration, and is accurately inserted vertically into the fitting hole 2. (See FIG. 3), and the lower end face is
Stop in contact with. It is also possible to press the upper end of the work 3 with the head 24 a of the air cylinder 24 while the outer part 4 is being inserted into the fitting hole 2, and to bring the lower end surface of the work 3 into contact with the stopper 14. By controlling the distance from the upper jig 12 (dimension G shown in FIG. 3), the press-fitting position of the work 3 with respect to the flange 1 can be accurately and reliably managed.

(6) The jig 10 is sequentially changed in the direction of arrow B and the direction of arrow C by the transfer unit 21 and transferred to the cooling unit 25. Then, when passing through the cooling section 25, cool air is blown to the flange 1, the work 3 and the jig 10 to be cooled. Since the fitting hole 2 has a larger shrinkage than the outer shape portion 4, the outer shape portion 4 is shrink-fitted into the fitting hole 2. When cooled sufficiently, the flange 1 and the work 3
Is taken out of the jig 10, the shrink-fit product shown in FIG. 4 is taken out.

According to the above embodiment, the following effects can be obtained. Since the work for mounting or removing the a, the flange 1 and the work 3 to or from the jig 10 can be performed at normal temperature, the workability is good, and there is no fear of burns, and the safety is improved. b, the flange 1 having the fitting hole 2 is made of a material having a large coefficient of thermal expansion, and the work 3 is made of a material having a small coefficient of thermal expansion. And shrink fitting conditions can be achieved.

C, a plurality of flanges 1 and workpieces 3
Because it can be heated and shrink-fitted continuously at the same time,
Productivity is significantly improved. Since vibration is applied to d, the flange 1 and the work 3, the work 3 is fitted to the flange 1 while centering, so that the work 3 is not tilted or galled. e, the upper and lower surfaces of the flange 1 are the upper jig 12 and the lower jig 1
Since it is pressed and fixed in step 1, it does not rattle in the jig 10 and is not damaged by impact. f, In the step of inserting the work 3 into the fitting hole 2, if the upper end of the work 3 is pressed, the work 3 can be securely pressed and fitted, and the press-fitting position of the flange 1 can be inspected at the same time.

[0020]

According to the first aspect of the present invention, the first member mounted on the mounting portion of the lower jig is accommodated in the accommodating portion of the upper jig, and the second member is fitted to the supporting portion. Then, the first coefficient of thermal expansion
Since the shaft of the second member having a small coefficient of thermal expansion can be supported above the fitting hole of the member, if the first and second members are assembled to the jig at room temperature, An excellent effect that workability can be remarkably improved by being able to shrink-fit by heating is exhibited. Moreover, since the first member has the upper and lower end surfaces fixed by the jig, there is an effect that the first member is not damaged by impact. Further, when the jig of the present invention is vibrated together with the components, only the first member has its upper surface pressed by its own weight, so that the first member and the second member cause different vibrations, There is an effect that the fitting of both members is performed smoothly.

According to the method of the second aspect, the first and second members assembled to the jig at room temperature can be moved as they are in the heating step, the inserting step, and the shrink-fitting step. Continuous work is possible, productivity is significantly improved,
In addition, since the heated member is not touched, the safety is significantly improved.

According to the apparatus of claim 3, at room temperature,
A first member and a second member are assembled to a jig, and a second member made of a material having a small coefficient of thermal expansion is provided above a fitting hole of the first member made of a material having a large coefficient of thermal expansion. If a plurality of jigs and the first and second members are collectively carried into the carrying unit, they are continuously carried to the heating unit, the vibration unit, and the cooling unit. The shaft portion is inserted into the fitting hole that has been expanded by expansion, and the shaft portion is shrink-fitted by further cooling, so that the productivity is remarkably improved, and furthermore, there is an excellent effect that the production can be performed safely and reliably. is there.

[Brief description of the drawings]

FIG. 1 is a front view of a jig and first and second exploded views.

FIG. 2 is a sectional view showing a first step in a manufacturing process.

FIG. 3 is a cross-sectional view showing a state where a shaft is inserted into a fitting hole.

FIG. 4 is a cross-sectional view showing a state where the second member is shrink-fitted to the first member.

FIG. 5 is a front view of the device.

FIG. 6 is a plan view of the device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange (1st member) 2 Fitting hole 3 Work (2nd member) 4 External part (shaft part) 10 Jig 11 Lower jig 12 Upper jig 13 Mounting part 14 Stopper 15 Guide part 16 Housing part Reference Signs List 17 Rotation hole part 18 Support part 20 Device 21 Transport part 22 Heating part 23 Vibrator (vibrating part) 25 Cooling part

Claims (3)

[Claims] 1. A second member made of a material having a small thermal expansion coefficient is fitted into a fitting hole of a first member made of a material having a large thermal expansion coefficient.
A jig for supporting the first and second members for shrink-fitting the shaft portion of the member, wherein a mounting portion for receiving a lower end surface of the first member and a circular guide formed on an outer peripheral portion thereof A lower jig having a portion, a receiving portion disposed above the lower jig, receiving the first member and pressing an upper end surface thereof, and a second portion formed at an upper portion of the receiving portion A jig for shrink-fitting parts of different materials, comprising: a support portion for vertically supporting a member; and an upper jig having a rotary hole rotatably fitted to the guide portion. 2. A jig is provided with a first member made of a material having a large coefficient of thermal expansion and a second member made of a material having a small coefficient of thermal expansion, and the shaft of the second member is attached to the jig. The first member and the second member are heated together with the jig vertically above the fitting hole of the first member, and the inner diameter of the fitting hole of the first member is the shaft of the second member. Reaches a predetermined temperature which is larger than the outer diameter of the first and second
Vibration is applied to the member and the jig to move the shaft of the second member to the first position.
And cooling the first and second members and the jig after the members are lowered and inserted into the fitting holes of the member. 3. A jig for vertically supporting a shaft of a second member made of a material having a small thermal expansion coefficient above a fitting hole of a first member made of a material having a large thermal expansion coefficient. A transport section for transporting the first and second members; and heating the jig and the first and second members to form the first and second members.
A heating unit that reaches a predetermined temperature at which the inner diameter of the fitting hole of the member is larger than the outer diameter of the shaft of the second member; and applying a vibration to the jig and the first and second members. A vibrating portion for lowering and inserting the shaft portion of the second member into the fitting hole of the first member; and a cooling portion for cooling the jig and the first and second members. Equipment for shrink fitting parts of different materials.