JP2001322038A - Induction heating shrink-fit apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a mechanism, and to dispense with excessive man power in adjusting an induction heating coil. SOLUTION: In this induction heating shrink-fit apparatus, the AC current is carried in an induction heating coil 1, a tool holder 2 is heated by the induced current generated thereby, and the shank portion of a blade 3 is shrink-fitted and fixed to a hole 3. The induction heating coil comprises a pair of coils 1a and 1b, the coils 1a and 1b are accommodated in holding parts 4a and 4b and located on a side surface of a tool holder 2 set on a shrink-fitting apparatus body 5. The holding parts 4a and 4b are fixed to a base 16, and fixed to laterally movable pedestals of a slide pack. A rack A21 and a rack B22 are fixed to each of the pedestals, a pinion fixed to the base 16 and having a load in one direction is provided. A stopper is provided on the holding part 4a, a shaft is passed through the stopper, and a spring 18 is provided thereon.

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]

The above-mentioned conventional induction heating shrink-fitting apparatus has different dimensions of the tool holder.
There is a problem that it is necessary to select and replace an optimum coil, and it takes time to set up.

[0004] In order to solve this problem, a device has been attempted in which the position of the induction heating coil can be adjusted so that replacement of holders having different sizes is unnecessary.
When adjusting the position of the induction heating coil corresponding to various sizes of tool holders to be shrink-fitted, turn the handle that moves the induction heating coil over several tens of turns,
You have to get to the optimal 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.

When the position of the induction heating coil is moved up and down in correspondence with the tool holders of various lengths to be shrink-fitted, it is necessary to turn the up and down handle over several tens of turns to move to the optimum position. No.

This is related to the lead of the screw similarly to the above, and it is large and heavy, cannot make the mechanism compact, requires excessive manpower, and is very expensive. There is a problem.

[0007]

In order to solve the above-mentioned problems, the present invention comprises an induction heating coil constituted by a pair of coils, which is arranged on a side surface of a tool holder so as to be position-adjustable. With this, the holding part holding the induction heating coil leans against the tool holder, and it is done without using a screw mechanism such as a ball screw nut or a linear screw nut or a handle mechanism that moves this screw mechanism to separate it. It does not require excessive human power and can be performed smoothly with less power.

[0008] In addition, the moving mechanism can be made compact and inexpensive.

Further, according to the present invention, the holding portion of the induction heating coil fixed to the pedestal is synchronized with the racks A and B, and the holding portion keeps an equal distance around a pinion having a load in one direction as an axis, so that it leans. , So that you can leave.

Further, a push button is provided on a side plate which is fixed to a constant load spring by a vertical slide pack and moves up and down, and a base and a holding portion fixed to the side plate are freely fixed at an arbitrary height. is there.

[0011]

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 rack A and the rack B are fixed to the pedestal of the slide pack that can be freely moved left and right, and the pedestal is fixed to the rack A and the rack B. The rack A and the rack B are fixed to the base, and there is a load in one direction. The pinion is engaged, and a stopper is provided on the holding part. The shaft fixed at both ends by the support penetrates through this stopper. Those having a spring between.

Further, a vertical slide pack is fixed to a column mounted on the shrink-fitting device main body, a constant load spring is provided on the upper surface, and a side fixed to the vertical slide pack and holding a base interlocked with the side. A push button is provided on the plate.

[0013]

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 composed of 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 blade, 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 is provided with 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 operation 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 housed 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 31 is provided on one side of the facing surface and fixed to 3a, 13b.

Racks A21 and 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, shafts 17 having both ends prevented by C-rings 20 are 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 portion 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 25 N which is larger than the spring load of about 20 N when the above-described spring 18 is the shortest length 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 is a side view showing a state in which a vertical slide pack 26 is fixed to a support 25 mounted on the shrink-fitting device main body 5, and a constant load spring 29 is provided on the upper surface thereof.

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 moved up and down by a position fixing push button 27 attached to a side surface thereof.

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

When the tool 3 is shrink-fitted into the tool holder 2, first, the tool holder 2 is set on the tool holder supporting portion 6 of the shrink-fitting device main body 5, and then the push button 27 is released to release the tool holder 2. Holders 4a, 4 to fit height
Adjust the height of b.

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, as shown in FIG. 5 and FIG.
When the catch male 24b is inserted into the catch knife 24a and the catch male 24b is inserted into the catch female 24a, the user further moves the holding portion 4a in the opening direction (left side in the figure) to cancel the fitting, and when the fitting is released, 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 tool holder 2 generates heat due to the eddy current loss generated by the generated current. The hole diameter increases.

When the temperature of the tool holder 2 reaches a temperature sufficient for shrink fitting, the temperature detecting means 31 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 above can be used to remove the blade 3 from the tool holder 2 already shrink-fitted.

[0042]

As described above, according to the present invention, the rack A in which the holding portion for holding the induction heating coil is fixed to the pedestal is provided.
The holding portion can be kept equidistant, lean, and move away from the pinion, which is synchronized with the rack B and has a load in one direction.

Further, since the push button is provided on the side plate which is fixed to the constant load spring by the vertical slide pack and moves up and down, the base fixed to the side plate,
The holding portion and the like can be freely fixed at an arbitrary height.

Therefore, a screw mechanism such as a ball screw nut or a linear screw nut or a handle mechanism for moving the screw mechanism is not used to move the holding portion for holding the induction heating coil toward or away from the tool holder. It can be performed smoothly with less force without the need for

In addition, the moving mechanism can be 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 the line CC of FIG. 5;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating coil 1a Coil 1b Coil 2 Tool holder 3 Blade 4a Holder 4b Holder 5 Shrink fit device main body 12a Support 12b Support 13a Pedestal 13b Pedestal 16 Base 17 Shaft 18 Spring 21 Rack A 22 Rack B 23 Pinion 25 Post 26 Vertical slide pack 27 Push button 28 Side plate 29 Constant load spring

Claims (2)

[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), and the pedestals (13a), (1) of the slide pack (13) that can move freely left and right.
3b), and racks A (21) and B (22) are fixed to the pedestals (13a) and (13b), respectively, and the base (16) is fixed to the racks A (21) and B (22). Pinion with a unidirectional load (2
3), and furthermore, a stopper (19) is provided on the holding portion (4a), and a shaft (17) fixed at both ends by supports (12a) and (12b) is passed through the stopper (19). An induction heating shrink fit device, comprising a spring (18) between a stopper (19) and a support (12a). 2. An upper and lower slide pack (26) is fixed to a support (25) mounted on a shrink fit device main body (5),
A constant load spring (29) is provided on the upper surface, and is fixed to the upper and lower slide packs (26), and is interlocked with the base (1).
2. An induction-heating shrink-fitting device according to claim 1, wherein a push button (27) is provided on the side plate (28) holding said (6).