JP2002052423A - Induction heating type shrinkage fit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely adjust the height of an induction heating coil even in a tool holder with a different length by adjusting the positions of the induction heating coil and the tool holder, to make the mechanism compact and to dispense with excessive man-powers for adjusting the induction heating coil. SOLUTION: Coils 1a, 1b are stored in holding parts 4a, 4b and positioned on the side of the tool holder 2 set on a shrinkage fit device main body 5. The holding parts 4a, 4b are fixed to a base 16 to be freely moved right and left, a vertical slide pack is fixed to a strut 25 mounted on the shrinkage fit device main body 5, and a constant load spring 29 is provided on the top face. A torsion coil spring is wound round the outer peripheral surface of a vertical moving lever 27, a lever screw 27a of a vertical moving lever 27 is allowed to resiliently abut on the strut 25 by the spring load of the torsion coil spring, and the base 16 to which the holding parts 4a, 4b are fixed is fixed at a designated height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction-heating shrink-fitting apparatus for shrink-fitting a tool shank into a hole of a tool holder.

[0002]

2. Description of the Related Art As a method of fitting and fixing a metal shaft member into a hole of a metal holder, a difference in thermal expansion of a metal due to induction heating caused by an eddy current loss caused by an induced current caused by a change in magnetic flux. There is one that shrink-fits using. (Publication No. 8-502212)

[0003]

In the above-mentioned conventional induction-heating shrink-fitting apparatus, the length of the tool holder is different.
When shrink-fitting, it is necessary to select and replace a coil at an optimum height corresponding to tool holders of various lengths, and there is a problem that it takes time for setup.

In order to solve this problem, attempts have been made to adjust the position of the induction heating coil so that the height can be easily adjusted even for holders having different lengths. Corresponding to the tool holder of
When adjusting the position of the induction heating coil, the handle for moving the induction heating coil must be turned over several tens of turns to approach the optimum position. In this case, the diameter of the screw must be increased in order to increase the screw lead and reduce the number of rotations of the handle, and to move the handle over a long distance, and accordingly the ball screw nut and the linear screw nut are large and heavy. Therefore, the mechanism cannot be made compact. In addition, there is a problem that excessive human power is required and the cost becomes very high.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an induction heating coil comprising a pair of coils, which are positioned so as to lean or move away from the side of the tool holder. This coil is arranged to be adjustable, and this coil is freely fixed to a desired height by a vertical movement lever and a torsion spring on a support mounted on the shrink-fitting device body, thereby adjusting the height of the induction heating coil. This can be performed without using a screw mechanism such as a ball screw nut or a linear screw nut, a handle mechanism for moving the screw mechanism, or the like, and does not require excessive human power and can be performed smoothly with a small force.

[0006] In this way, the moving mechanisms are made compact and inexpensively manufactured.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an alternating current is applied to an induction heating coil, and a tool holder is heated by the induced current generated by the induction current, and a shank portion of a cutting tool is fixed to a hole of the tool holder by shrink fitting. In the shrink-fitting device, the induction heating coil is constituted by a pair of coils, the coil is housed in a holding portion, and is positioned on a side surface of a tool holder set on the shrink-fitting device main body. The upper and lower slide packs are fixed to a support mounted on the shrink-fitting device body, and a constant load spring is provided on the upper surface, and fixed to the upper and lower slide packs. A lever screw insertion hole is provided in the side plate that holds the base that is linked with the lever, and the lever screw formed at the tip of the vertical movement lever can be freely advanced and retracted in this lever screw insertion hole Flip narrowing, wound torsion spring on the outer circumferential surface of the vertical movement lever, elastic contact the Rebaneji the vertical movement lever to the strut by the spring load of the torsion spring, is intended to secure the base to a predetermined height.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the principle of the present invention. In the drawing, reference numeral 1 denotes an induction heating coil comprising a pair of coils 1a and 1b. The coils 1a and 1b are hollow cylindrical or prismatic ferrites. Windings 1g, 1h are wound around cores 1c, 1d made of the above material via bobbins 1e, 1f.

2 is a tool holder, 2a is a hole, 3 is a cutting tool, 3a is a shank, A is a coil 1a at the time of heating,
1b shows the direction of magnetic flux generated inside and around 1b in a pseudo manner.

FIG. 2 is an external view of the shrink fitting apparatus, FIG. 3 is a top view, and FIG. 4 is a sectional view taken along line BB of FIG.

In FIG. 1, reference numeral 5 denotes a shrink-fitting apparatus main body, which comprises an operation section 33 on the front side, a control section 32 inside, and a tool holder support section 6 on the upper part, and the tool holder 2 is set on the support section 6. Have been.

Reference numerals 7a and 7b denote telescopic hoses connected to the hollow portions of the cores 1c and 1d. The other ends of the hoses are connected to a cooling fan (not shown) in the shrink-fitting device main body 5.

The operating section 33 is provided with a heating start SW 34, a heating completion lamp 36, and a cooling button 35.

The induction heating coil 1 is accommodated in holding portions 4a and 4b, and the holding portions 4a and 4b are fixed to a base 16 and can be freely moved left and right.
A temperature detecting means 37 is provided on one side of the facing surface, which is fixed to 3a, 13b.

A rack A21 and a rack B22 are fixed to the pedestals 13a and 13b, respectively.
The pinion 23 is fixed to the base 16 of the rack B22, generates a torque of 0.5 kgf · cm when rotated clockwise, and has a mechanism that idles in the counterclockwise direction.

Further, a shaft 17 whose both ends are prevented from falling off by C-rings 20 is attached to supports 12a and 12b fixed to both ends of the base 16.

The shaft 17 passes through a stopper 19 provided on the holding portion 4a, and the stopper 19 and the supporter 1
2a has a load of about 7N exceeding the torque of the pinion 23 of about 0.5 kgf · cm at the time of maximum extension (when there is no tool holder 2 and the holding portions 4a and 4b come into contact), and Catch male 24b is catch female 2
A spring 18 having a load of about 20 N at the shortest length when fitted in 4 a is provided.

The holding part 4a has a catch male 24b.
Are fixed, and the catch 12 is attached to the support 12a.
4b is provided with a catch knife 24a.

It is to be noted that a fitting strength of about 25N which is larger than a spring load of about 20N when the shortest length of the spring 18 is used is used.

FIG. 5 shows that the holding portions 4a and 4b open to the maximum,
FIG. 6 is a top view when the catch male 24b is fitted into the catch knife 24a, and FIG. 6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 shows a holding portion 4a fixed to the base 16 along a support 25 mounted on the shrink fit device main body 5.
8 is a cross-sectional view taken along the line DD of FIG. 7, FIG. 9 is a side view of the state in which the holding portions 4a, 4b are lowered along the columns 25, and FIG. EE in FIG.
It is sectional drawing.

An upper and lower slide pack 26 is fixed to the column 25, and a constant load spring 29 is provided on the upper surface thereof. 30
Is a holder for the constant load spring 29.

A side plate 28 is fixed to the upper and lower slide packs 26, and holds the base 16 thereon.

The side plate 28 is provided with a lever screw insertion hole 28a on a side surface thereof and a spring fixing hole 28b near the lever screw insertion hole 28a.
A lever screw 27a formed at the end of the screw 7 is screwed forward and backward.

A torsion spring 31 is wound around the outer peripheral surface of the up / down moving lever 27. One end 31a of the torsion spring 31 is inserted and fixed in the lever screw insertion hole 28a, and the other end 31b is at the tip end of the up / down moving lever 27. Has been hooked on.

The vertical movement lever 27 is normally moved by the lever screw 27a by the spring load of the torsion spring 31.
Resiliently contacts the column 25 and fixes the base 16 to which the holding portions 4a and 4b are fixed at its height. When the holding portions 4a and 4b are to be moved up and down, the vertical movement lever 27 is moved by the spring of the torsion spring 31. The lever screw 27a is rotated against the load as shown by the arrow A to separate the lever screw 27a from the column 25. When the lever screw 27a reaches a predetermined height, the hand is released and the lever screw 27a is elastically contacted with the column 25 again and fixed there.

Next, the operation of the present invention will be described.

When shrink-fitting the blade 3 to the tool holder 2, first, the tool holder 2 is set on the tool holder support 6 of the shrink-fitting device main body 5.

Subsequently, as shown in FIGS. 9 and 10, the vertical movement lever 27 is rotated as shown by the arrow A against the spring load of the torsion spring 31 so that the lever screw 27a is separated from the support 25 and the height of the tool holder 2 is raised. The side plate 28 and the base 16 are moved up and down along the column 25 so as to match the height, and the height of the holding portions 4a and 4b integrated with the side plate 28 is adjusted.

At this time, the set load of the constant load spring 29 which generates a constant load at any position is about 0.3 N which can freely hold a total load of about 3 kg of the holding portions 4 a and 4 b fixed to the base 16. And the above-mentioned holding parts 4a, 4b
Adjustment of the height of the is very easy.

Next, when the holding portions 4a and 4b reach a predetermined height, the user lifts the hand from the vertical movement lever 27, and as shown in FIG.
As shown in FIG. 8, the lever screw 27 a elastically contacts the support 25 by the return spring load of the torsion spring 31, and is completely fixed there.

Next, as shown in FIG. 5 and FIG.
When the catch male 24b is fitted into the catch knife 24a, the user moves the holding portion 4a further in the opening direction (left side in the figure) to release the fitting, and releases the fitting. Spring 1 that was compressed
8 expands and moves the holding portion 4 a with a load exceeding the torque of the pinion 23.

Thus, the racks A21 and B22 fixed to the holding portions 4a and 4b via the pinion 23
As a result, the holding portions 4a and 4b come close to each other, and come into contact with the tool holder 2 and can be heated.

In this state, the heating start SW3 of the operation unit 33
4 presses the high-frequency current (usually 2
(0 kHz or more).

Magnetic flux A generated by both coils 1a and 1b
Penetrates the inside of the tool holder 2.

At this time, an induced current induced by the magnetic flux flows through the magnetic flux penetrating portion of the tool holder 2, and the eddy current loss generated thereby causes the tool holder 2 to generate heat. The hole diameter increases.

When the temperature of the tool holder 2 reaches a temperature sufficient for shrink fitting, the temperature detecting means 37 detects this temperature and automatically stops energizing the coils 1a and 1b. The heating completion lamp 36 is turned on, and a buzzer (not shown) is sounded to notify the user of the completion of heating.

Thereafter, the user operates the shank 3a of the blade 3
Into the hole 2a of the tool holder 2. After the insertion, when the user presses the cooling button 35, the cooling air passes through the hoses 7a, 7b branched from the cooling fan (not shown) and the hollow cylindrical or prismatic cores 1c, 1d, and the tool The holder 2 is cooled.

Due to this cooling, the hole 2a of the tool holder 2 which has been thermally expanded contracts and tightens the blade 3 so that it does not come off.

The tool holder 2 shrink-fitted as described above
After cooling, the holding section 4b is opened to open the holding section 4b.
When the catch male 24b is fitted into the catch knife 24a, the holding portions 4a and 4b are fixed, and the tool holder 2 for which shrink fitting has been completed can be removed from the shrink fitting device.

The same procedure as described above may be used to remove the blade 3 from the tool holder 2 already shrink-fitted.

[0043]

As described above, according to the present invention, the induction heating coil is constituted by a pair of coils, and this coil is disposed so as to be adjustable in position as it leans toward or away from the side surface of the tool holder. Is fixed freely to an arbitrary height by a vertical movement lever and a torsion spring on a support mounted on the body of the shrink-fitting device. With this, a ball screw nut, a linear screw nut, etc. can be used to adjust the height of the induction heating coil. This can be performed without using the screw mechanism described above or the handle mechanism that moves the screw mechanism, and the operation can be performed smoothly with a small amount of force without requiring excessive human power. In addition, the moving mechanisms are made compact and inexpensive.

[Brief description of the drawings]

FIG. 1 is a heating principle diagram showing one embodiment of the present invention.

FIG. 2 is an external perspective view showing one embodiment of the present invention.

FIG. 3 is a main part top view showing one embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a main part top view showing one embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a side view of a main part showing one embodiment of the present invention.

8 is a sectional view taken along the line DD of FIG. 7;

FIG. 9 is a main part side view showing one embodiment of the present invention.

FIG. 10 is a sectional view taken along the line EE of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating coil 1a Coil 1b Coil 2 Tool holder 3 Tool 4a Holder 4b Holder 5 Shrink fit device main body 16 Base 17 Shaft 18 Spring 25 Support 26 Vertical slide pack 27 Vertical movement lever 28 Side plate 29 Constant load spring 31 Torsion spring

Claims (1)

[Claims] 1. An alternating current is passed through an induction heating coil (1), and an induced current generated by the alternating current causes a tool holder (2).
Is heated, and the shank portion (3a) of the cutting tool (3) is fixed to the hole (2a) by shrink fitting. In the induction heating shrink fitting device, the induction heating coil (1) is connected to a pair of coils (1a). ) And (1b), and this coil (1
a) and (1b) are stored in the holding portions (4a) and (4b) and positioned on the side of the tool holder (2) set on the shrink fit device main body (5), and the holding portion (4a). ,
(4b) is fixed to the base (16) so as to be freely movable left and right, and further, the vertical slide pack (26) is fixed to the support (25) mounted on the shrink fit device main body (5). A constant load spring (29) is provided on the side plate (28) fixed to the vertical slide pack (26) and holding the base (16) interlocked therewith, and a lever screw insertion hole (28a) is provided. A lever screw (27a) formed at the tip of the vertical movement lever (27) is screwed into the lever screw insertion hole (28a) so as to freely advance and retreat, and a torsion spring (31) is wound around the outer peripheral surface of the up and down movement lever (27). The lever screw (27a) of the vertical movement lever (27) is supported by the support (2) by the spring load of 31).
5) An induction heating shrink-fitting device which is elastically contacted with 5) and fixes the base (16) at a predetermined height.