JP2001179544A - Cutter tool shrinkage fitting device with electromagnetic induction heating and tool holding part for blade tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for efficiently shrinkage-fitting a cutter tool to a tool holder in a short time without generating the noise. SOLUTION: This shrinkage fitting device is formed of a shrinkage fit heating coil unit 1 for electromagnetic induction heating of a tool holding part, which is formed of 3-4 kinds of electromagnetic induction heating coils 6 having a different diameter and to be provided with a space in the periphery of a tool holding part 11 and a control unit 20 having a high frequency generating unit for flowing the high frequency to the coils 6, an automatic frequency control circuit, a turning circuit for stopping the current when the current flowing to the coils 6 and size of the tool holding part do not much with each other, a timer and a temperature sensor, and a tool holding part 11 for tool holder appropriate for the heating coil unit 1 for electromagnetic induction heating and having a coefficient of thermal expansion at 16.0×10-6/ deg.C or more and high strength characteristic at 750 N/mm2 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink fit in which a tooling tool applied to machining is gripped by a tooling holder, and more particularly to an apparatus which heats and shrinks in a short time with high efficiency and energy saving. .

[0002]

2. Description of the Related Art In a conventional blade tool, a shank of a tool inserted into a chuck portion of a tool holding portion of a tool holder is fastened with a nut and pinched and fixed by a needle roller, or is held by shrink fitting. The attachment of the tool to the tool holder by this shrink fit utilizes the difference between the thermal expansion of the tool holder and the thermal expansion of the tool shank. By the way, the shank of the cutting tool is made of cemented carbide, cermet, or high-speed tool steel, and these materials are made of a relatively low expansion material. For example, a cemented carbide has a thermal expansion coefficient of 5.0 × 10 ^−6. / ° C, and the thermal expansion coefficient of the high-speed tool steel is 11.0 × 10 ⁻⁶ / ° C. On the other hand, a relatively high-expansion material is used for the tool holding portion of the tool holder, and nickel chromium In the case of using steel, the coefficient of thermal expansion is 10.5 to 11.6 × 10 ⁻⁶ / ° C.
The thermal expansion coefficient of the austenitic special steel disclosed in US Pat. No. 480007 is 17.0 × 10 ⁻⁶ / ° C. In particular, when austenitic special steel is used, shrink-fitting of tools at low temperatures is possible. By the way, the shrink fitting of the cutting tool is conventionally performed by hot air heating. However, this shrink fit is inferior in heating efficiency due to hot air heating and requires a long time for heating, loud noise due to hot air blowing noise, and temperature control is difficult, and it is not easy to maintain an appropriate temperature. Was.

[0003]

The problem to be solved by the present invention is to easily control the heating temperature at the time of mounting a cutting tool for a machine tool to a tool holder by shrink-fitting with an optimum heating time. A sensor for controlling the maximum heating temperature by means of a sensor, and a shrink-fitting device by electromagnetic induction heating capable of maximizing the characteristics of the member of the tool gripping part in a short time, efficiently and without generating noise, and this shrinking device. An object of the present invention is to provide a tool holding portion of a tool holder applied to a fitting device.

[0004]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems relates to a system in which a tool shank portion of a blade tool is gripped on a tool gripping portion of a tool holder by shrink fitting. That is, the shrink fit by the electromagnetic induction heating method is applied instead of the shrink fit by the conventional hot air heating method. The means of the present invention is a tool gripper to which shrink fit by the electromagnetic induction heating method can be most efficiently applied, and in combination with these tool grippers, is applied to tool grippers of various sizes. This is an electromagnetic induction heating device that can be shrink-fitted efficiently.

That is, according to the first aspect of the present invention, there are provided three to four types of electromagnetic induction heating devices having different diameters for separately installing around the tool holding portion in accordance with the size of the tool holding portion. A high-frequency generator for generating a high-frequency current that is selected from the coil group and the electromagnetic induction heating coil group in accordance with the size of the tool gripper and flows through one coil installed around the tool gripper; and an automatic frequency control circuit. It consists of a control circuit that has a tuning circuit that determines whether the current flowing through the installed heating coil and the size of the tool gripper are compatible or incompatible and stops the current when there is a mismatch, a timer that supplies high-frequency current for a predetermined time, and a maximum temperature sensor. An electromagnetic induction heating apparatus used in combination with a tool holding portion of a tool holder for cutting and cutting, which is suitable for shrink fitting by electromagnetic induction heating.

According to a second aspect of the present invention, in a blade tool holder comprising a connection portion of a machine tool, a manipulator holding portion, and a tool grip portion for gripping a tool shank, the tool grip portion can be heated by electromagnetic induction and has a thermal expansion coefficient. Is 16.0 × 10
A tool holding portion of a tool holder for a tool holder suitable for shrink fitting by electromagnetic induction heating, comprising a member satisfying characteristics of having a high strength of not less than ⁻⁶ / ° C. and not less than 750 N / mm ² .

According to a third aspect of the present invention, the member of the tool gripping portion is austempered ductile cast iron having a bainite structure, and the tool holder suitable for shrink fitting by electromagnetic induction heating according to the second aspect. It is a tool grip.

According to a fourth aspect of the present invention, the member of the tool holding portion is an austenitic heat-resistant steel having a sprayed layer of martensitic steel or ferritic steel formed on a surface thereof. This is a tool holding part of a blade tool holder suitable for shrink fitting by induction heating.

According to a fifth aspect of the present invention, the member of the tool holding portion is an austenitic stainless steel having a sprayed layer of martensitic steel or ferritic steel formed on a surface thereof. This is a tool holding part of a blade tool holder suitable for shrink fitting by induction heating.

According to a sixth aspect of the present invention, the member of the tool holding portion is a high manganese steel having a sprayed layer of martensitic steel or ferritic steel formed on a surface thereof. This is a tool holding part of a blade tool holder suitable for shrink fitting by heating.

[0011] In the invention of claim 7, the thickness of the thermal sprayed layer is 0.1 mm.
A tool grip portion of a blade tool holder suitable for shrink fitting by electromagnetic induction heating in the means according to any one of claims 4 to 6, characterized in that it is 1 to 5.0 mm.

Here, the operation of the means of the present invention will be described. In the electromagnetic induction heating, an eddy current is generated by electromagnetic induction by flowing an alternating current through a metal or the like to be heated in a coil connected to an AC power supply, and the object to be heated is heated by Joule heat. Therefore, in the means of the first aspect, there are several types of the size of the tool gripping part, from a slim one to a thick one. Therefore, the coils for electromagnetic induction heating are provided as slim coils, small coils, medium coils, and large coils as a group of coils for electromagnetic induction heating, which are adapted to the size of these tool grips. One of the optimum coils can be selected according to the size. The selected coil can be set apart around the target tool grip. In addition, a high-frequency generator for flowing high-frequency current to the coil installed around the tool gripper, an automatic frequency control circuit that automatically controls the generated frequency to a constant frequency, and a current flowing to the heating coil and the tool gripper Since the control unit has a tuning circuit that determines whether the size is compatible or not and stops the current when it is not suitable, and a timer that supplies a high-frequency current to the coil for a predetermined time, the heating temperature can be easily controlled by the optimal heating time using the timer. In addition, the maximum heating temperature can be controlled by the temperature sensor. In particular, if the temperature of the tool gripper or the like subjected to the tempering becomes too high, for example, 380 ° C. or more, the material is deteriorated. Therefore, the heating time is controlled so as not to exceed the maximum temperature, for example, 350 ° C. Can be controlled by a temperature sensor. Furthermore, it goes without saying that the electromagnetic induction heating device of the present invention can be used to remove the shrink-fitted tool from the tool grip.

In the conventional shrink-fitting technique using hot air heating, as described above, the shank of the cutting tool is made of a relatively low-expansion material such as cemented carbide, cermet, or high-speed tool steel, that is, having a thermal expansion coefficient of It is 5.0 × 10 ⁻⁶ / ° C. for the alloy and 11.0 × 10 ⁻⁶ / ° C. for the high speed tool steel.
On the other hand, a relatively high-expansion material is used for the tool gripping portion of the tool holder, and the thermal expansion coefficient is 10.5 to 11.6 × 10 ⁻⁶ / ° C. when using nickel chrome steel. However, in order to shrink at a lower temperature, it is desirable that the thermal expansion coefficient is larger. The thermal expansion coefficient is set to 17.0 × 10 ⁻⁶ / ° C. using austenitic special steel.
However, since the tool holding portion made of austenitic special steel is a non-magnetic material, it is difficult to perform electromagnetic induction heating.

Therefore, the means according to claims 2 to 7 of the present invention enables shrink-fitting of a tool at a lower temperature, and is combined with the shrink-fitting device by electromagnetic induction heating of the means of claim 1 above. This is a tool holding part of a usable tool holder.

That is, according to the second aspect of the present invention, the tool holding portion of the tool holder has a thermal expansion coefficient of 16.0 × 10.
^-6 / ° C. and at least it is an element which satisfies the characteristic having a 750 N / mm ² or more high strength. By setting the thermal expansion coefficient to 16.0 × 10 ⁻⁶ / ° C. or more, shrink fitting can be performed at a low shrink fitting temperature. Further, by using a member having a strength of 750 N / mm ² or more, the strength of the conventional tool holding portion can be made comparable to the strength of a conventional tool holding portion, for example, tempered steel of SCM440, and the tool holding function can be sufficiently performed. it can.

According to a third aspect of the present invention, the member of the tool gripper is made of austempered ductile cast iron having a bainite structure, for example, FCD600ADI. The reason for using this material is that the coefficient of thermal expansion is 16.7 × 10 ⁻⁶ / ° C.
Thus, it is sufficient for shrink-fitting at a lower temperature and has satisfactory mechanical properties. In particular, since it has a bainite structure due to austempering, it has excellent toughness, is suitable for the mechanical properties of the tool grip, and is a magnetic material that can be heated by electromagnetic induction. This is because it is optimal as a tool gripper for a tool holder used for fitting.

On the other hand, in the case of electromagnetic induction heating, austenitic stainless steel such as SUS631, austenitic heat-resistant steel such as SUH660, and high manganese steel such as SCMnH21 are fired from the viewpoint of thermal expansion coefficient and mechanical properties. Although it is most suitable as a tool holding portion of a tool holder to which a fit is applied, there is a problem that these are nonmagnetic materials and cannot be heated by electromagnetic induction.

Therefore, in the means of claims 4 to 6 of the present invention, the main body of such a tool gripper is made of a material having a high strength and a thermal expansion coefficient suitable for shrink fitting. In order to eliminate the point that electromagnetic induction heating is not possible because they are non-magnetic materials, a thermal sprayed layer of, for example, SUS403 of martensitic or ferritic steel, which is a magnetic material, is formed on the surface of the tool gripper body made of these materials. By doing so, the tool holding portion main body is accurately heated to a temperature suitable for shrink fitting by the electromagnetic induction heating of the sprayed layer. In particular, SUS631 austenitic stainless steel or SUH660 austenitic heat-resistant steel can be suitably used as a material for the tool gripper body in terms of mechanical properties such as heat resistance and tensile strength.

Further, the means of claim 7 is the above-mentioned claim 4.
The thickness of the sprayed layer in the means of ~ 6 ~ 0.1 ~ 5mm,
If it is thinner than 0.1 mm, sufficient electromagnetic induction heating cannot be obtained,
When the thickness is more than 5 mm, the thermal spraying cost is increased, the surface appearance is inferior, the thickness of the grip body becomes insufficient, and the mechanical strength is inferior. Therefore, the thickness of the thermal spray layer is set to 0.1 to 5 mm. . However, preferably 1.0 to
4.0 mm.

In the above, the reason for selecting martensitic or ferritic steel as the magnetic material of the sprayed layer is as follows.
The main body of the tool gripper is made of austenitic stainless steel such as SUS631, heat-resistant austenitic steel such as SUH660 or high-manganese steel which is heat-resistant steel such as SCM.
Since nH21 or the like is used, for example, SUS40 of martensitic stainless steel, which is the same material as these materials, is used.
By setting it to 3, the adhesion becomes good, and the thermal spraying layer can be prevented from being detached from the main body due to thermal expansion or thermal contraction.

[0021]

Embodiments of the present invention will be described with reference to the drawings. The electromagnetic induction heating apparatus according to the present invention has a coil 6 for flowing a high-frequency current that is separately installed around a tool holding portion 11 of a tool holder. By the way, the size of the tool holding portion 11 of the tool holder varies from slim to small, medium and large depending on the relationship between the blade tool 16 and the work as the workpiece. In accordance with the size of the tool gripper 11, the coil 6 that is separately installed around the tool gripper 11 is also a slim coil, a small coil,
Several kinds of coils including a medium coil and a large coil are provided as a coil group for electromagnetic induction heating. The coils 6 of various sizes are mounted in advance below the coil mounting plate 5 as shown in FIG. A hole is formed in the upper part of the coil of the coil mounting plate 5 for inserting a tool, and a handle 9 is mounted. On the left and right sides of the lower surface of the coil mounting plate 5, coils 6
And has a contact banana jack 8 which is connected to and flows a current. Thus, different coil mounting plates 5 on which coils of various sizes are mounted are prepared.

On the other hand, as shown in FIG. 1, the heating coil section 1 is composed of a frame 2, has a coil cooling fan 3 on the side, and has a tool shank gripping hole 14 at the center of the heating coil section 1. It is possible to install the tool gripper 11 that has been set. Left and right holding frames 4 on the side of the frame 2 of the heating coil unit 1
A jack insertion hole 7 serving as a contact for allowing a high-frequency current to flow through the coil 6 is provided on the upper side, and is connected to a high-frequency generation circuit and a control unit in the heating device main body 25.

The tool holder 10 is, as shown in FIG.
A tool gripper 11 is inserted into the upper part and attached by conventional means such as a collet chuck, and a lower part comprises a manipulator holding part 12 and a connection part 13 for a machine tool. A tool shank gripping hole 14 is provided in the upper center of the tool gripping portion 11, and a tool shank 17 is inserted and shrink-fitted. FIG. 6 is a schematic view of a tool gripper 11 having a tool shank gripper hole 14, a coil 6 disposed at a distance from the outer periphery of the tool gripper 11, and a high-frequency generator 15 for generating a high-frequency current flowing through the coil 6. Shown in

That is, according to the first embodiment of the present invention, the heating coil unit 1 used in combination with various sizes of the tool holders of the tool holder which is suitable for shrink fitting by electromagnetic induction heating is used. The tool gripping portion 11 is attached to the center of the tool with the tool shank gripping hole 14 facing upward. It should be noted that identification numbers are assigned to tool grips of various sizes, respectively. On the other hand, the heating coil unit 1 includes an electromagnetic induction heating coil group including a plurality of coil mounting plates 5 to which coils 6 having different sizes are mounted. An identification number is assigned to each coil group. One coil mounting plate 5 selected according to the size of the tool gripper 11 for shrink-fitting the tool from the electromagnetic induction heating coil group is placed and mounted on the holding frame 4 of the heating coil unit 1. . In this case, the coils 6 of the coil mounting plate 5 are separated from each other around the tool holding portion 11. A control unit 20 having a high-frequency current generator 15 for flowing a high-frequency current through the coil 6 is provided inside the heating device main body 25.
The control unit 20 further includes an automatic frequency control circuit 21, a tuning circuit 22 for judging whether or not the current flowing through the coil 6 matches the size of the tool gripper and stopping the current when the current does not match. Time flowing timer 23
And a circuit for controlling the maximum heating temperature by the temperature sensor 24.

According to the second embodiment of the present invention, in a tool holder for mounting the blade tool 16 on a machine tool,
The tool holding part 11 of the present invention is made of a member that can be heated by electromagnetic induction. That is, when a high-frequency current is applied to the coil 6 and an AC magnetic field is applied to the tool holding portion 11, an eddy current is generated inside by electromagnetic induction, and a member that generates Joule heat is used. The main body of the tool holding portion 11 has a coefficient of thermal expansion of 16.0 × 10 ⁻⁶ / ° C. or more, and is suitable for shrink fitting by electromagnetic induction heating. Further, by setting the strength to 750 N / mm ² or more,
There is no trouble during machining as a tool gripping member.

In order to satisfy the second embodiment of the present invention, in the third embodiment of the present invention, the member of the tool holding portion 11 is made of austempered ductile iron having a bainite structure. This is, for example, a spheroidized graphite cast iron material FCD600 having an austempering treatment to give a bainite structure, and a tensile strength of 750 N / mm.
Has ^two or more, and the thermal expansion coefficient of 16.5 × 10 ^-6 / ℃
It is. Since this material is a magnetic material, electromagnetic induction heating can be performed with the tool holding portion 11 made of this material as it is.

As another embodiment, the tool holding unit 11
The material of the main body of the tool gripper 11 is excellent in mechanical properties as a material of the main body of the tool gripping portion 11, but is a material which is difficult to be heated by electromagnetic induction as it is because it is a non-magnetic material. Austenitic heat-resistant steel such as SUH660 is used as the material. Claim 5
According to the invention, an austenitic stainless steel, for example, SUS631, is used as a material of the main body of the tool holding portion 11. Further, although different from the austenitic steel as described above, in the invention of claim 6, a high manganese steel, such as SCMn, which is a heat-resistant steel, is used as the material of the main body of the tool holding portion 11.
H21. Each of these materials satisfies the condition of claim 2 in terms of thermal expansion coefficient and tensile strength. Then, the surface of the tool gripper main body formed from these materials is roughened by mechanical processing such as formation of a screw groove or blasting processing so that good adhesion can be obtained. A metal, which is a magnetic material, is sprayed to form a sprayed layer. The thermal spray layer is made of a material that is familiar with the material of the tool gripper body. As a material suitable for these, a martensitic stainless steel or a ferritic stainless steel is used as the sprayed layer. In this case, the thermal spraying may be performed by any method, as long as it can achieve good adhesion regardless of gas spraying, arc spraying, or plasma spraying.

According to an embodiment of the present invention, as shown in FIG. 7, the thickness of the sprayed layer 19 is set to 0.1 to 5 mm, particularly preferably 1.0 to 4.0 mm. It is formed on the surface of the gripper body 18.

Next, the operation of the heating device main body 25 of the present invention will be described. The tool gripper 11 having the optimal size is selected according to the cutter tool 16 to be used and the shape of the workpiece.
As shown in FIG. 1, the heating coil unit 1 is installed. Next, the coil mounting plate 5 having the coil 6 optimal for the size of the installed tool holding portion 11 is selected from the electromagnetic heating coil group including the coil mounting plate 5 on which the various coils 6 are mounted, and the handle is selected. The tool is set on the frame 2 of the heating coil unit 1 from above the tool holding unit 11 which is gripped and installed by 9. Next, banana jacks 8 on the lower left and right sides of the coil mounting plate 5 are inserted into the jack insertion holes 7 of the frame 2 and connected to the coils so that current flows through the coils. Preparation is completed above. Therefore, as shown in the block diagram of FIG. 3, the power supply (not shown) of the power supply circuit is turned on, and the digital switch of the operation unit is turned on.

When the digital switch of the operation unit is turned on,
As shown in the flowchart of FIG. 4, when the physical characteristics of the tool gripper 11 and the selected coil 6 are known empirically and the heating time is clear, the optimum coil and tool gripper 11 to be used are used. Set the timer to time. And when the start switch is turned on, operation starts,
After selecting the timer mode on the line on the left side of FIG. 4 and capturing time data, heating is started. A temperature sensor 24 for measuring the heating temperature is brought close to the tool grip 11, and detects a maximum temperature of, for example, 350 ° C. Then, while operating the temperature sensor at 0 N, the tool gripping portion 11 is heated by electromagnetic induction for a timer set time to a temperature suitable for shrink fitting. When the temperature reaches the optimum temperature, the power is cut off by the timer and the heating is stopped. Here, as shown in FIG. 6, the shank 17 of the blade tool 16 is inserted into the shank holding hole 14 of the tool holding portion 11. The blade tool 16 is shrink-fitted by the temperature decrease due to natural cooling, and
Is gripped. Above, the temperature sensor is 350 ° C
If is detected within the set time, turn off the power and stop heating without waiting for the set time. Furthermore, the blade tool 16 inserted and attached to the tool gripper 11 can be electromagnetically heated and extracted from the tool gripper 11, and in this case, a set collar for detection is attached to the blade tool 16, The tool gripper 11 in which the blade tool 16 is heated by electromagnetic induction
It is also possible to make the sensor detect the set collar for detection at the time of dropping out of the shank holding hole 14 and stop the heating.

If the identification number of the tool gripper 11 to be used and the identification number of the selected coil 6 are known, the numbers are set in the digital switch-on of the operation unit. When the start switch is turned on, the operation is started. FIG.
The selection mode of the center line is selected, the set value of the heating time is taken in based on the identification number of the tool gripper 11 and the coil 6, and the heating is started. The temperature is adjusted to a temperature suitable for shrink fitting by electromagnetic induction heating for a time. When the optimum temperature is reached, the power is turned off to stop heating, shrink-fitted, and naturally cooled.

If the tool gripper 11 to be used is the first one, and it is not clear whether the coil 6 selected in accordance therewith is optimal or not, the prediction mode is set by turning on the digital switch. When the start switch is turned on, the operation is started, and the prediction mode of the right line in FIG. 4 is selected. In this case, water droplets are applied to the tool holding portion 11 set in the heating coil portion 1, the starting temperature is taken, and electromagnetic induction heating is started from that temperature. Water drop is 1 due to temperature rise of the tool gripper 11.
An evaporation temperature of 00 ° C. is reached. The time required to reach this temperature is measured, and the heating time required to reach a temperature suitable for shrink fitting is automatically calculated and set from the time required for this heating. Thereafter, the temperature sensor is turned on in the same manner as described above, and the temperature is set to a temperature suitable for shrink fitting by electromagnetic induction heating for a set time. When the optimum temperature is reached, the power is turned off to stop heating, shrink-fitted, and naturally cooled.

In the above, the heating of the heating coil unit 1 is controlled by the control unit 20 as shown in the block diagram of FIG. When the heating is started in the flowchart of FIG. 4, a high frequency is generated by the oscillation circuit, a power for heating the coil 6 is applied by the power amplification unit, and a high-frequency current flows through the coil. In this case, the frequency tuned by the voltage signal related to the coil 6 that has been negatively fed back from the feedback circuit from the heating coil 6 is automatically controlled to be constant to stabilize the high frequency and increase the power efficiency. In addition, the control unit 20 has a timer for setting the heating time described above,
Further, there is provided a tuning circuit for judging whether or not the current flowing in the installed heating coil and the size of the tool gripping portion are compatible or not, and stopping the current when the size is mismatched.

In the above description, the diameter of each coil is 20 mm for a slim coil, 30 mm for a small coil, 50 mm for a medium coil, and 70 mm for a large coil.

The chemical composition of austempered ductile iron having a bainite structure of FCD600, which is the material of the tool gripping portion of the tool holder of the present invention, is expressed as% by weight.
And C: 3.45%, Si: 2.73%, Mn: 0.1
5%, P: 0.020%, S: 0.004%, Cu:
0.486%, Mg: 0.035%, with the balance Fe
And a cast iron comprising unavoidable impurities. In the austempering treatment of the heat treatment, bainite is maintained at 370 ° C. in a salt bath for 2 hours.

[0036]

EXAMPLE A tool gripper main body is made of SUS631 of austenitic stainless steel, and SUS403 of martensitic stainless steel is sprayed as a sprayed layer on the surface. A: Thermal spray layer thickness 2 mm, no thermal spray base treatment, inner diameter of tool shank gripping hole 19.965 mm B: Thermal spray layer thickness 2 mm, thermal spray base treatment with thread groove, tool inner shank grip hole 19.966 mm C: Thermal spray layer thickness 4 mm, thermal spray base treatment with thread groove, inner diameter of tool shank gripping hole 19.967 mm

The cemented carbide tool is shrink-fitted to the tool gripping portion constituted as described above by the electromagnetic induction heating device of the present invention. The outer diameter of the carbide tool end mill is 19.995 mm. Therefore, the interference is A: 30 μm, B: 29 μm, and C: 28 μm. The used coil and the large coil are φ70 mm.

Table 1 shows the results of inserting the carbide tool. From the results in Table 1, it can be seen that all can be inserted up to 200 ° C., and the heating effect is greater when the thickness of the sprayed layer is 4 mm.

[0039]

[Table 1]

Table 2 shows the results of removing the carbide tool. It can be seen that extraction is possible regardless of whether the sprayed layer is 2 mm or 4 mm.

[0041]

[Table 2]

[0042]

As described above, according to the present invention, the electromagnetic induction heating device and the material of the tool holding portion are made of a material suitable for the electromagnetic induction heating device, so that the cutting tool can be burned into the tool holder. This provides an excellent effect such that the insertion and the removal can be performed more efficiently, in a shorter time, easily and without generating noise as compared with the conventional shrink fit by hot air heating.

[Brief description of the drawings]

FIG. 1 is a partial elevational view of a heating coil unit showing a tool holding unit and a coil.

FIG. 2 is an explanatory view showing a coil holding plate and how to attach the coil holding plate;
(A) is a perspective view, (b) is a side view.

FIG. 3 is a basic operation block diagram of the electromagnetic induction heating device.

FIG. 4 is a flowchart of an operation method of the electromagnetic induction heating device.

FIG. 5 is a side view showing a schematic shape of the cutting tool and the tool holder, partially cut away;

FIG. 6 is a schematic diagram showing a high-frequency generator and a coil installed around a tool holding unit.

FIG. 7 is a view schematically showing a cross section of a sprayed layer portion of a tool grip portion on which a sprayed layer is formed.

FIG. 8 is a side view showing a relationship between a heating coil unit and a heating device main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heating coil part 2 Frame 3 Cooling fan 4 Holding frame 5 Coil mounting plate 6 Coil 7 Jack insertion hole 8 Banana jack 9 Handle 10 Tool holder 11 Tool gripping part 12 Manipulator holding part 13 Connection part 14 Shank holding hole 15 High frequency current generation Instrument 16 Cutting tool 17 Tool shank 18 Gripping unit main body 19 Thermal spray layer 20 Control unit 21 Automatic frequency control circuit 22 Tuning circuit 23 Timer 24 Temperature sensor 25 Heating device main unit

Claims (7)

[Claims] 1. An electromagnetic induction heating coil group having three to four different diameters for differently installing the electromagnetic induction heating coil group to be separately installed around the tool grip part according to the size of the tool grip part, and holding the tool from the electromagnetic induction heating coil group. A high-frequency generator that generates a high-frequency current to flow through one coil installed around the tool gripper, which is selected according to the size of the part, a current that flows through the heating coil installed with the automatic frequency control circuit, and the size of the tool gripper Suitable for shrink-fitting by electromagnetic induction heating, characterized by a tuning circuit for judging the suitability or non-conformity of the current and stopping the current when it is inconsistent, and a control unit having a timer and a maximum temperature sensor for flowing a high-frequency current for a predetermined time. An electromagnetic induction heating device to be used in combination with the tool gripper of the tool holder. 2. A connection part of a machine tool and holding of a manipulator.
Blade consisting of a part and a tool gripper for gripping the tool shank
In the tool holder, the tool gripper can be heated by electromagnetic induction
With a coefficient of thermal expansion of 16.0 × 10^-6/ ℃ or more and 7
50N / mm ^TwoA part that satisfies the above high strength properties
Baking by electromagnetic induction heating characterized by being made of wood
Tool holder of the tool holder suitable for cutting. 3. The tool gripping portion of a tool holder according to claim 2, wherein the member of the tool gripping portion is austempered ductile cast iron having a bainite structure. 4. The shrink fit by electromagnetic induction heating according to claim 2, wherein the member of the tool holding portion is a heat resistant austenitic steel having a sprayed layer of martensitic steel or ferritic steel formed on the surface. Tool gripper of blade tool holder suitable for. 5. The shrink fit by electromagnetic induction heating according to claim 2, wherein the member of the tool holding portion is an austenitic stainless steel having a sprayed layer of martensitic steel or ferritic steel formed on the surface. Tool gripper of blade tool holder suitable for. 6. A shrink fit by electromagnetic induction heating according to claim 2, wherein the member of the tool gripping portion is a heat-resistant high-manganese steel having a sprayed layer of martensitic steel or ferritic steel formed on the surface. Tool gripper of blade tool holder suitable for. 7. The cutting tool suitable for shrink fitting by electromagnetic induction heating according to claim 4, wherein the thickness of the sprayed layer is 0.1 to 5.0 mm. Tool holder of holder.