WO2013112095A1 - Induction hardening device and assembly - Google Patents

Induction hardening device and assembly Download PDF

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Publication number
WO2013112095A1
WO2013112095A1 PCT/SE2013/000008 SE2013000008W WO2013112095A1 WO 2013112095 A1 WO2013112095 A1 WO 2013112095A1 SE 2013000008 W SE2013000008 W SE 2013000008W WO 2013112095 A1 WO2013112095 A1 WO 2013112095A1
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WO
WIPO (PCT)
Prior art keywords
induction hardening
insulator block
connecting means
workpiece
devices
Prior art date
Application number
PCT/SE2013/000008
Other languages
French (fr)
Inventor
Henrik Karlsson
Walter DATCHARY
Original Assignee
Aktiebolaget Skf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aktiebolaget Skf filed Critical Aktiebolaget Skf
Publication of WO2013112095A1 publication Critical patent/WO2013112095A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to heat treatment of metal components. More specifically, the invention relates to induction hardening of metallic workpieces.
  • the invention relates to an induction hardening device for hardening a metal component.
  • the inventions relates to an induction hardening assembly for hardening a metal component.
  • Induction hardening is a heat treatment process in which an area of a steel component is heated in order to increase the hardness.
  • the area of the steel component is heated to the ferrite/austenite transformation temperature or higher by induction heating and then the component is quenched.
  • the quenched steel component undergoes martensitic transformation, increasing the hardness and brittleness of the induction hardened area.
  • Induction hardening may be used to selectively harden areas of a metal component without affecting the properties of the component as a whole.
  • the hardening is performed by an induction hardening machine comprising an induction hardening device.
  • the device comprises an inductor core, e.g. a coil, and an insulator block partly surrounding the core.
  • the insulator block ascertains that the generated magnetic flow from the core is mainly directed towards the component to be hardened and furthermore the block reduces magnetic flows in the other directions.
  • Induction hardening may be used for many different components with different shapes. Due to this, it is necessary to design very specific induction hardening devices for these different components. This may lead to the need to have many different induction hardening devices with different shapes and properties. In the field of bearings, there are numerous shapes and designs, such as different ball bearings with varying sizes and shapes, different roller bearings with varying sizes and shapes. When induction hardening a specific component of a specific bearing type, it is necessary to tailor an induction hardening device for that specific bearing component. When induction hardening several different components or when induction hardening similar components with different hardening specifications, it will lead to the need to design and tailor different induction hardening devices for each specific need.
  • an object of the present invention is to overcome at least one of the drawbacks of the prior art. More specifically, an object is to provide a more flexible induction hardening device. It has namely been found that when induction hardening several different components there was a need to design several different induction hardening devices, which is costly. Furthermore, it may be impractical since this will lead to the build up of a stock of different induction hardening devices.
  • the object is achieved by providing an induction hardening device for hardening a metallic workpiece.
  • the device comprises at least one inductor core and an insulator block that presents an outer peripheral surface.
  • the insulator block at least partly encloses the at least one inductor core such that a magnetic flow generated from the at least one inductor core is directed in a specific direction towards the workpiece.
  • the insulator block presents at least one connecting means on the outer peripheral surface, wherein the connecting means is meant to be able to connect to another induction hardening device.
  • the connecting means of the induction hardening device is meant to be able to connect to another insulator block of another induction hardening device.
  • the connecting means is meant to be connected to an intermediate component which is placed between the two induction hardening devices that are to be connected.
  • the connecting means of the induction hardening device is any or a combination of: 1 ) a plug and socket connection, 2) a screw or bolt connection, 3) a magnetic connection, 4) an adhesive or 5) a mechanical fixation means.
  • a mechanical fixation means may for example be a hasp connection, a hook connection, a staple connection, a snap lock connection, a spring fixation means or any other suitable mechanical connection means.
  • the insulator block of the induction hardening device is detachably connected to the at least one inductor core. This will lead to an even more flexible induction hardening device.
  • the insulator block of the induction hardening device comprises at least two different insulating materials.
  • the insulator block of the induction hardening device presents a symmetrical geometry around the at least one inductor core. In an embodiment, the insulator block of the induction hardening device presents a non-symmetrical geometry around the at least one inductor core.
  • the induction hardening device comprises at least two inductor cores.
  • the inductor core may for instance have an elongated straight shape, a spiral shape, a circular shape, or any other suitable shape.
  • the object is achieved by an induction hardening assembly for hardening a workpiece.
  • the induction hardening assembly for hardening a workpiece.
  • hardening assembly comprises at least two induction hardening devices according to the first aspect of the invention, wherein the two devices are connected via their connecting means. It shall be noted that all embodiments of the first aspect are applicable to all embodiments of the second aspect and vice versa.
  • the induction hardening assembly is built up of at least two building blocks, i.e. at least two induction hardening devices according to the fist aspect, which leads to a flexible design with the possibility to combine two or more induction hardening devices with different and/or similar specifications.
  • induction hardening is to be performed on a number of different components of a bearing
  • induction hardening devices examples of different bearing types are deep groove ball bearings, tapered roller bearings, spherical roller bearings, angular contact ball bearings, slewing bearings, cylindrical roller bearings etc.
  • induction hardening a spherical raceway of a bearing ring of a spherical roller bearing it will require a certain shape of the induction hardening assembly that can be tailored by connecting a number of induction hardening devices.
  • the at least two blocks of the at least two induction hardening devices of the induction hardening assembly present different materials with different magnetic properties and/or different geometrical dimensions. In an embodiment, the at least two blocks of the at least two induction hardening devices of the induction hardening assembly present different heat transfer and/or electrical insulation properties.
  • Figure 1 shows a cross section of an induction hardening device according to the first aspect of the invention.
  • Figure 2 shows a cross section of an induction hardening assembly according to the second aspect of the invention.
  • Figure 3 shows a cross section of an induction hardening assembly according to the second aspect of the invention.
  • FIG 1 a cross section of an induction hardening device 1 for hardening a metallic workpiece 2 according to the first aspect of the invention is disclosed.
  • the metallic workpiece 2 shown is an axial cross section of a bearing ring (in this case an inner ring of a bearing).
  • the cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring.
  • the bearing ring 2 presents a raceway 21 .
  • the induction hardening device 1 comprises an inductor core 3 and an insulator block 4.
  • the insulator block 4 presents an outer peripheral surface 5.
  • the insulator block 4 at least partly encloses the inductor core 3, which leads to that the magnetic flow 6 is mainly directed towards the workpiece 2.
  • the insulator block 4 presents a connecting means 7 on its outer peripheral surface 5.
  • the connecting means 7 is meant to be able to connect to another induction hardening device (not shown in figure 1).
  • the connecting means 7 is meant to be connected to another insulator block of another induction hardening device (not shown in figure 1).
  • the induction hardening device 1 shown is one example of how the induction hardening device 1 may be shaped. There is of course a plurality of possible shapes of the induction hardening device 1. For instance, the inductor core 3 may be spiral shaped, straight, or any other possible shape.
  • the shape of the inductor core 3 and the insulator block 4 may depend on which type of workpiece 2 that is to be hardened. Furthermore, the device 1 may have more than one inductor core 3. In an embodiment, the device 1 comprises two inductor cores 3 (not shown in the figure). The insulator block 4 may also have different shapes and materials in order to create a desired magnetic flow 6.
  • the connecting means 7 could be any kind of connecting means, such as a plug and socket connection, screw or bolt connection, mechanical fixation means, spring fixation means, magnetic connection, an adhesive (glue) etc.
  • FIG 2 a cross section of an induction hardening assembly 10 for hardening a workpiece 2 according to the second aspect of the invention is shown.
  • the metallic workpiece 2 shown is a cross section of a bearing ring (in this case an inner ring of a bearing).
  • the cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring.
  • the bearing ring 2 presents a raceway 21.
  • the induction hardening assembly 10 comprises two induction hardening devices 1 according to the first aspect.
  • the assembly 10 may of course be made of more than two devices 1.
  • the two induction hardening devices 1 comprise inductor cores 3 and insulator blocks 4.
  • the insulator blocks 4 present outer peripheral surfaces 5, which comprises connecting means 7.
  • the connecting means 7 connects the two induction hardening devices 1 together.
  • the two inductor cores when activated, creates magnetic flows 6 directed towards the workpiece 2.
  • the connecting means 7 are in this illustration placed on a side surface of the insulator block. However, the connecting means 7 may be on any surface on the outer peripheral surface 5 of the insulator block 4.
  • the workpiece 2 shown is a cross section of an inner ring of a bearing presenting a conical raceway 21 .
  • the cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring.
  • the induction hardening assembly 10 comprises two induction hardening devices 1 according to the first aspect.
  • the assembly 10 may of course be made of more than two devices .
  • the two induction hardening devices 1 comprise inductor cores 3 and insulator blocks 4.
  • the insulator blocks 4 present outer peripheral surfaces 5, which comprise connecting means 7.
  • the connecting means 7 connects the two induction hardening devices 1 together.
  • the two inductor cores when activated, create magnetic flows 6 directed towards the workpiece 2.
  • the connecting means 7 are in this illustration placed on a side surface of the insulator block.
  • the connecting means 7 may be on any surface on the outer peripheral surface 5 of the insulator block 4.
  • the shape of the insulator blocks 4 differs in this embodiment to the ones presented in figure 1 and 2 in that the surfaces of the blocks 4 being adjacent to the conical raceway 21 of the workpiece 2 are inclined to match the shape of the raceway 21 .
  • the two inductor cores 3 may also be powered differently to thereby create different magnetic flows 6 from each core 3.
  • the insulator blocks 4 may be shaped differently and/or comprise different materials with different magnetic properties.
  • the inventive concept thus provides a number of possible variants which leads to a very flexible design that makes it possible to tailor an induction hardening assembly for a specific workpiece shape by combining different and/or similar building blocks (induction hardening devices 1).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

Induction hardening device (1) for hardening a metallic workpiece (2). The device (1) comprises at least one inductor core (3), an insulator block (4) that presents an outer peripheral surface (5). The insulator block (4) at least partly encloses the at least one inductor core (3) such that a magnetic flow (6) generated from the at least one inductor core (3) is directed in a specific direction towards the workpiece (2). Furthermore, the insulator block (4) presents at least one connecting means (7) on the outer peripheral surface (5), wherein the connecting means (7) is meant to be able to connect to another induction hardening device. Furthermore, an induction hardening assembly (10) is disclosed, comprising at least two induction hardening devices (1), wherein the devices (1) are connected via their connecting means (7).

Description

INDUCTION HARDENING DEVICE AND ASSEMBLY
FIELD OF THE INVENTION
The present invention relates to heat treatment of metal components. More specifically, the invention relates to induction hardening of metallic workpieces.
According to a first aspect, the invention relates to an induction hardening device for hardening a metal component.
According to a second aspect, the inventions relates to an induction hardening assembly for hardening a metal component.
BACKGROUND OF THE INVENTION
Induction hardening is a heat treatment process in which an area of a steel component is heated in order to increase the hardness. The area of the steel component is heated to the ferrite/austenite transformation temperature or higher by induction heating and then the component is quenched. The quenched steel component undergoes martensitic transformation, increasing the hardness and brittleness of the induction hardened area. Induction hardening may be used to selectively harden areas of a metal component without affecting the properties of the component as a whole.
The hardening is performed by an induction hardening machine comprising an induction hardening device. The device comprises an inductor core, e.g. a coil, and an insulator block partly surrounding the core. The insulator block ascertains that the generated magnetic flow from the core is mainly directed towards the component to be hardened and furthermore the block reduces magnetic flows in the other directions.
Induction hardening may be used for many different components with different shapes. Due to this, it is necessary to design very specific induction hardening devices for these different components. This may lead to the need to have many different induction hardening devices with different shapes and properties. In the field of bearings, there are numerous shapes and designs, such as different ball bearings with varying sizes and shapes, different roller bearings with varying sizes and shapes. When induction hardening a specific component of a specific bearing type, it is necessary to tailor an induction hardening device for that specific bearing component. When induction hardening several different components or when induction hardening similar components with different hardening specifications, it will lead to the need to design and tailor different induction hardening devices for each specific need.
SUMMARY OF THE INVENTION
Thus, an object of the present invention is to overcome at least one of the drawbacks of the prior art. More specifically, an object is to provide a more flexible induction hardening device. It has namely been found that when induction hardening several different components there was a need to design several different induction hardening devices, which is costly. Furthermore, it may be impractical since this will lead to the build up of a stock of different induction hardening devices.
Thus, according to the first aspect of the invention, the object is achieved by providing an induction hardening device for hardening a metallic workpiece. The device comprises at least one inductor core and an insulator block that presents an outer peripheral surface. The insulator block at least partly encloses the at least one inductor core such that a magnetic flow generated from the at least one inductor core is directed in a specific direction towards the workpiece.
Furthermore, the insulator block presents at least one connecting means on the outer peripheral surface, wherein the connecting means is meant to be able to connect to another induction hardening device.
This leads to a more flexible induction hardening device, which makes it possible to connect different induction hardening devices with similar and/or different specifications and thereby tailor a unit for a specific need. In other words, these induction hardening devices could be seen as building blocks to create a design that suits a specific need. Furthermore, this will lead to that it will no longer be necessary to build up a large stock of different induction hardening devices, where each device is tailored for a specific component. This will reduce the total cost of the induction hardening operation. Furthermore, the time needed for resetting the induction hardening machine when switching to another workpiece will be reduced.
In an embodiment, the connecting means of the induction hardening device is meant to be able to connect to another insulator block of another induction hardening device. In another embodiment, the connecting means is meant to be connected to an intermediate component which is placed between the two induction hardening devices that are to be connected.
In an embodiment, the connecting means of the induction hardening device is any or a combination of: 1 ) a plug and socket connection, 2) a screw or bolt connection, 3) a magnetic connection, 4) an adhesive or 5) a mechanical fixation means. A mechanical fixation means may for example be a hasp connection, a hook connection, a staple connection, a snap lock connection, a spring fixation means or any other suitable mechanical connection means.
In an embodiment, the insulator block of the induction hardening device is detachably connected to the at least one inductor core. This will lead to an even more flexible induction hardening device. By having the possibility to also replace the insulator block with another insulator block with other properties, it is possible to tailor the induction hardening device for the specific component to be hardened. This feature in combination with the connecting means on the device results in an even more flexible solution.
In an embodiment, the insulator block of the induction hardening device comprises at least two different insulating materials.
In an embodiment, the insulator block of the induction hardening device presents a symmetrical geometry around the at least one inductor core. In an embodiment, the insulator block of the induction hardening device presents a non-symmetrical geometry around the at least one inductor core.
In an embodiment, the induction hardening device comprises at least two inductor cores. There are many different possible shapes for the inductor core. The inductor core may for instance have an elongated straight shape, a spiral shape, a circular shape, or any other suitable shape.
According to the second aspect of the invention, the object is achieved by an induction hardening assembly for hardening a workpiece. The induction
hardening assembly comprises at least two induction hardening devices according to the first aspect of the invention, wherein the two devices are connected via their connecting means. It shall be noted that all embodiments of the first aspect are applicable to all embodiments of the second aspect and vice versa. The induction hardening assembly is built up of at least two building blocks, i.e. at least two induction hardening devices according to the fist aspect, which leads to a flexible design with the possibility to combine two or more induction hardening devices with different and/or similar specifications. For instance, if induction hardening is to be performed on a number of different components of a bearing, it is possible to tailor an induction hardening assembly for each such bearing component by building the induction hardening assembly of a number of building blocks (induction hardening devices). Examples of different bearing types are deep groove ball bearings, tapered roller bearings, spherical roller bearings, angular contact ball bearings, slewing bearings, cylindrical roller bearings etc. Thus, when for example induction hardening a spherical raceway of a bearing ring of a spherical roller bearing it will require a certain shape of the induction hardening assembly that can be tailored by connecting a number of induction hardening devices.
In an embodiment, the at least two blocks of the at least two induction hardening devices of the induction hardening assembly present different materials with different magnetic properties and/or different geometrical dimensions. In an embodiment, the at least two blocks of the at least two induction hardening devices of the induction hardening assembly present different heat transfer and/or electrical insulation properties.
BRIEF DESCRIPTION OF DRAWINGS
Exemplifying embodiments of the present invention will now be described in more detail, with reference to the accompanying drawings, wherein:
Figure 1 shows a cross section of an induction hardening device according to the first aspect of the invention. Figure 2 shows a cross section of an induction hardening assembly according to the second aspect of the invention.
Figure 3 shows a cross section of an induction hardening assembly according to the second aspect of the invention.
The drawings show diagrammatic exemplifying embodiments of the present invention and are thus not drawn to scale. It shall be understood that the embodiments shown and described are exemplifying and that the invention is not limited to these embodiments. It shall also be noted that some details in the drawings may be exaggerated in order to better describe and illustrate the invention.
DETAILED DESCRIPTION OF DRAWINGS
In figure 1 , a cross section of an induction hardening device 1 for hardening a metallic workpiece 2 according to the first aspect of the invention is disclosed. The metallic workpiece 2 shown is an axial cross section of a bearing ring (in this case an inner ring of a bearing). The cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring. The bearing ring 2 presents a raceway 21 . The induction hardening device 1 comprises an inductor core 3 and an insulator block 4. The insulator block 4 presents an outer peripheral surface 5. When the induction hardening device is activated, i.e. when a current is applied to the inductor core 3, a magnetic flow 6 is created to heat up a surface of the workpiece 2. The insulator block 4 at least partly encloses the inductor core 3, which leads to that the magnetic flow 6 is mainly directed towards the workpiece 2. The insulator block 4 presents a connecting means 7 on its outer peripheral surface 5. The connecting means 7 is meant to be able to connect to another induction hardening device (not shown in figure 1). In an embodiment, the connecting means 7 is meant to be connected to another insulator block of another induction hardening device (not shown in figure 1). The induction hardening device 1 shown is one example of how the induction hardening device 1 may be shaped. There is of course a plurality of possible shapes of the induction hardening device 1. For instance, the inductor core 3 may be spiral shaped, straight, or any other possible shape. The shape of the inductor core 3 and the insulator block 4 may depend on which type of workpiece 2 that is to be hardened. Furthermore, the device 1 may have more than one inductor core 3. In an embodiment, the device 1 comprises two inductor cores 3 (not shown in the figure). The insulator block 4 may also have different shapes and materials in order to create a desired magnetic flow 6. The connecting means 7 could be any kind of connecting means, such as a plug and socket connection, screw or bolt connection, mechanical fixation means, spring fixation means, magnetic connection, an adhesive (glue) etc.
In figure 2, a cross section of an induction hardening assembly 10 for hardening a workpiece 2 according to the second aspect of the invention is shown. The metallic workpiece 2 shown is a cross section of a bearing ring (in this case an inner ring of a bearing). The cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring. The bearing ring 2 presents a raceway 21. The induction hardening assembly 10 comprises two induction hardening devices 1 according to the first aspect. The assembly 10 may of course be made of more than two devices 1. The two induction hardening devices 1 comprise inductor cores 3 and insulator blocks 4. The insulator blocks 4 present outer peripheral surfaces 5, which comprises connecting means 7. The connecting means 7 connects the two induction hardening devices 1 together. The two inductor cores, when activated, creates magnetic flows 6 directed towards the workpiece 2. The connecting means 7 are in this illustration placed on a side surface of the insulator block. However, the connecting means 7 may be on any surface on the outer peripheral surface 5 of the insulator block 4. By connecting two or more devices 1 into an induction hardening assembly 10, it is possible to tailor an assembly 10 for a specific workpiece, which has a specific shape and characteristics. This leads thus to a flexible system which is built up of a number of building blocks, i.e. a number of induction hardening devices 1 . In figure 3, another induction hardening assembly 10 for hardening a workpiece 2 is disclosed. In this drawing, the workpiece 2 shown is a cross section of an inner ring of a bearing presenting a conical raceway 21 . The cross section of the workpiece 2 is a cross section along an axial center line of the bearing ring. The induction hardening assembly 10 comprises two induction hardening devices 1 according to the first aspect. The assembly 10 may of course be made of more than two devices . The two induction hardening devices 1 comprise inductor cores 3 and insulator blocks 4. The insulator blocks 4 present outer peripheral surfaces 5, which comprise connecting means 7. The connecting means 7 connects the two induction hardening devices 1 together. The two inductor cores, when activated, create magnetic flows 6 directed towards the workpiece 2. The connecting means 7 are in this illustration placed on a side surface of the insulator block. However, the connecting means 7 may be on any surface on the outer peripheral surface 5 of the insulator block 4. The shape of the insulator blocks 4 differs in this embodiment to the ones presented in figure 1 and 2 in that the surfaces of the blocks 4 being adjacent to the conical raceway 21 of the workpiece 2 are inclined to match the shape of the raceway 21 . The two inductor cores 3 may also be powered differently to thereby create different magnetic flows 6 from each core 3. Also, as previously stated, the insulator blocks 4 may be shaped differently and/or comprise different materials with different magnetic properties. The inventive concept thus provides a number of possible variants which leads to a very flexible design that makes it possible to tailor an induction hardening assembly for a specific workpiece shape by combining different and/or similar building blocks (induction hardening devices 1).

Claims

1. Induction hardening device (1) for hardening a metallic workpiece (2), comprising,
- at least one inductor core (3),
- an insulator block (4) presenting an outer peripheral surface (5),
- wherein the insulator block (4) at least partly encloses the at least one inductor core (3) such that a magnetic flow (6) generated from the at least one inductor core (3) is directed in a specific direction towards the workpiece (2),
characterized in that,
- the insulator block (4) presents at least one connecting means (7) on the outer peripheral surface (5), wherein the connecting means (7) is meant to be able to connect to another induction hardening device.
Induction hardening device (1 ) according to claim 1 ,
- wherein the connecting means (7) is meant to be able to connect to another insulator block of another induction hardening device.
3. Induction hardening device (1) according to any of the preceding claims, - wherein the connecting means (7) is any or a combination of:
- a plug and socket connection,
- a screw or bolt connection,
- a magnetic connection,
- an adhesive, or - a mechanical fixation means. Induction hardening device (1) according to any of the preceding claims,
- wherein the insulator block (4) is detachably connected to the at least one inductor core (3).
Induction hardening device (1) according to any of the preceding claims,
- wherein the insulator block (4) comprises at least two different insulating materials.
Induction hardening device (1) according to any of the preceding claims,
- wherein the insulator block (4) presents a symmetrical geometry around the at least one inductor core.
Induction hardening device (1) according to any of the preceding claims,
- wherein the insulator block (4) presents a non-symmetrical geometry around the at least one inductor core.
Induction hardening assembly (10) for hardening a workpiece (2), comprising,
- at least two induction hardening devices (1 ) according to anyone of the preceding claims, wherein the two devices (1 ) are connected via their connecting means (7).
Induction hardening assembly (10) for hardening a workpiece (2) according to claim 8, - wherein the at least two blocks (4) of the at least two induction hardening devices (1) present different materials with different magnetic properties and/or different geometrical dimensions.
Induction hardening assembly (10) for hardening a workpiece according to any of claims 8 - 10,
- wherein the at least two blocks (4) of the at least two induction hardening devices (1) present different heat transfer and/or electrical insulation properties.
PCT/SE2013/000008 2012-01-26 2013-01-18 Induction hardening device and assembly WO2013112095A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1200054-3 2012-01-26
SE1200054 2012-01-26

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003214A (en) * 2001-06-22 2003-01-08 Denki Kogyo Co Ltd Apparatus for induction-hardening crank shaft
JP2004031189A (en) * 2002-06-27 2004-01-29 High Frequency Heattreat Co Ltd Ferrite core for magnetic flux concentration of induction heating coil
US20100243643A1 (en) * 2009-03-30 2010-09-30 Cesano Mariolino Device and method for performing a localized induction hardening treatment on mechanical components, specifically thrust blocks for large-sized rolling bearings
US20110084062A1 (en) * 2009-09-10 2011-04-14 Sms Elotherm Gmbh Device for inductive heating and use of such a device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003214A (en) * 2001-06-22 2003-01-08 Denki Kogyo Co Ltd Apparatus for induction-hardening crank shaft
JP2004031189A (en) * 2002-06-27 2004-01-29 High Frequency Heattreat Co Ltd Ferrite core for magnetic flux concentration of induction heating coil
US20100243643A1 (en) * 2009-03-30 2010-09-30 Cesano Mariolino Device and method for performing a localized induction hardening treatment on mechanical components, specifically thrust blocks for large-sized rolling bearings
US20110084062A1 (en) * 2009-09-10 2011-04-14 Sms Elotherm Gmbh Device for inductive heating and use of such a device

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