DE102017115202A1 - Device for inductive heating of a component - Google Patents

Abstract

The invention relates to a device for inductively heating a component, in particular for shrinking or shrinking a tool within a clamping opening (15) of a shrink chuck (14), with an induction coil (12) into which the component can be laterally inserted and removed, and with an AC voltage source (24) to which the induction coil (12) is connectable. The induction coil (12) has an open area (16) in the circumferential direction with two opposite ends (21, 29). The induction coil (12) is thus not completely closed in the circumferential direction.

Description

The invention relates to a device for inductive heating of a component, in particular for shrinking or shrinking a tool within a clamping opening of a shrink chuck, with an induction coil, in which the component is insertable, and with an AC voltage source to which the induction coil is connectable.

Such devices for shrinking or shrinking a tool within a clamping opening of a shrink chuck have been used for years.

Typically, such devices include a fully closed (annular) induction coil having a plurality of turns into which the component to be inductively heated is inserted axially from one end.

In order to ensure a good efficiency, in this case, the diameter of the induction coil must be adapted to the diameter of the component to be heated to a certain extent. If different components with significantly different diameters are to be inductively heated, different induction coils are necessary for this purpose. Furthermore, the necessary large axial travel path for extending and retracting a component into the induction coil is disadvantageous.

From the DE 202 03 784 U1 a device for inductive heating of a component is known in which in one embodiment, a divided into two halves induction coil is provided which are pivotable between an open position for retraction and extension of the component and a closed position for inductive heating of the component.

However, the structure of the induction coil is complicated and has no particularly good efficiency.

Against this background, the invention has for its object to provide a device for inductive heating of a component that allows easy handling and good efficiency in the inductive heating of components.

This object is achieved in a device according to the aforementioned type in that the induction coil in the circumferential direction has an open area with two opposite ends.

The object of the invention is completely solved in this way.

Since in this way the induction coil is not completely closed in the circumferential direction, but instead has an open region on one side, the component to be inductively heated can be introduced laterally into the induction coil or removed therefrom. By eliminating the need for axial travel in the prior art tools and shrink chuck can be used, which are larger in the radial direction than the diameter of the shrink chuck within the induction coil in the area to be heated. Also, components having larger diameter differences can be easily heated, as long as they can be radially inserted through the open region of the induction coil.

It has been found that, surprisingly, despite the not completely closed induction coil, a largely homogeneous heating of a component or shrink chuck is possible. The induced eddy currents flow through the entire component, despite an incomplete looping through the induction coil. The special type in the coil geometry utilizes the effect of current displacement caused by the alternating current during induction heating in such a way that an eddy current passes through the rotationally symmetric component without additional aids, so that the component is heated substantially homogeneously along its outer circumference.

In an advantageous embodiment of the invention, the induction coil extends over an angular range of 360 ° -α, wherein α is at most 180 °, preferably at most 150 °, more preferably at most 120 °, particularly preferably at most 100 °.

In this way, on the one hand the simplest possible entry and exit of components with a larger diameter in the induction coil or from the induction coil out in the radial direction allows. At the same time, on the other hand, the energy induced by the induction coil on the heating element becomes sufficiently large to allow effective working. A particularly good compromise between a homogeneous heating of the component on the one hand and the largest possible insertable tool on the other hand arises when the angle α, over which the open area extends, is at most about 100 ° to 120 °. Here, the angle α is defined as the center point angle, measured from the coil center point to the two open ends of the coil.

The induction coil preferably has a number of turns n which is greater than 1 is, preferably greater than 5 is.

By using a coil with a larger number of turns, a more uniform heating of components over a larger axial range can be made possible. Depending on the length and size of the components to be heated, the induction coil is adapted in a suitable manner by their number of turns and size ago.

According to a further feature of the invention, the induction coil has a magnetically conductive, electrically non-conductive core, which is surrounded by the windings of the induction coil.

As a result, the efficiency can be improved and a more homogeneous heating can be supported.

According to a further feature of the invention, a pole piece of a magnetically conductive, non-electrically conductive material is arranged at one axial end of the induction coil, which has a central recess for passing a tool engaging in the clamping opening.

In this way, the magnetic energy generated in the inductive heating of a shrink chuck can be effectively shielded from the outer areas that are not to be heated. In this way, a faster and more effective heating can be ensured without substantially heating external areas which are not to be heated.

The pole disk can consist of several segments in a development of the invention.

Here, for example, outer, radially deliverable, circular segment-shaped segments and inner straight segments can be provided, which can optionally be delivered or pulled out.

According to a further embodiment of the invention, the pole disk comprises a plurality of radially adjustable, preferably circular cutout segments.

As far as an induction coil is used with at least two relatively rotatable coil parts, they can be firmly connected to corresponding, preferably circular segment-shaped segments of a pole disk.

With these features results in a simplified adaptation of the pole disk to different sized shrink chuck.

Furthermore, according to a further feature of the invention, the induction coil is at least partially enclosed externally by a jacket made of a magnetically conductive, non-electrically conductive material.

This leads to a further homogenization of the inductive heating.

The pole disk or the additional jacket are preferably made of a ferrite material. This is a magnetically highly conductive material that is not electrically conductive. Preferably, a soft magnetic ferrite material is used here.

According to a further feature of the invention, the induction coil on at least two relatively rotatable coil parts.

By this measure, it is possible to introduce even larger rotationally symmetric components in the induction coil laterally in the radial direction or drive out. Furthermore, the distance between the coil and the workpiece can be adjusted specifically. By varying the distance, a power control can be achieved regardless of the generator used.

In this case, each coil part is preferably designed as an independent coil part, wherein the two coil parts are connected to one another via an electrically conductive, flexible connection.

This results in a structurally simple construction of the induction coil.

According to a further feature of the invention, the pole disk has a plurality of segments.

If the induction coil consists of several coil parts, in this case each coil part can be firmly connected to a segment.

When pivoting the coil parts, the segments of the pole disk are thus at an optimum distance from the workpiece.

Further, the segments may be arranged radially adjustable, preferably be acted upon radially inwardly resiliently.

In this way, the setting of an optimal distance to the workpiece easier.

It is understood that the features of the invention mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

• 1 eine perspektivische Ansicht der erfindungsgemäßen Vorrichtung;
• 2 eine Ansicht gemäß 1, jedoch in geschnittener Darstellung;
• 3 einen Querschnitt durch die Vorrichtung gemäß 1;
• 3a eine Abwandlung der Vorrichtung gemäß 3, wobei die Induktionsspule in zwei zueinander verschwenkbare Spulenhälften aufgeteilt ist;
• 4 einen Teilschnitt durch die Vorrichtung gemäß 3 längs der Linie IV-IV;
• 5 einen Teilschnitt durch die Vorrichtung gemäß 3 längs der Linie V-V;
• 6 einen Schnitt durch die Induktionsspule in einer abgewandelten Ausführung;
• 7 eine Seitenansicht der Induktionsspule gemäß 6;
• 8 eine Ansicht der Induktionsspule gemäß 6 längs der Linie VIII-VIII;
• 9 eine Induktionsspule gemäß 6 mit zwei zueinander verschwenkbaren Teilen, mit denen zugeordnete Polscheibensegmente am axialen Ende fest verbunden sind;
• 10 eine Induktionsspule gemäß 3, mit am axialen Ende aufgesetzten äußeren kreisabschnittsförmigen Polscheibensegmenten und inneren geraden Polscheibensegmenten, die wahlweise verstellt oder herausgezogen werden können und
• 11 eine Induktionsspule gemäß 3, mit am axialen Ende aufgesetzten äußeren kreissegmentförmigen Polscheibensegmenten, die radial verstellbar sind.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings. Show it:

• 1 a perspective view of the device according to the invention;
• 2 a view according to 1 , but in a sectional view;
• 3 a cross section through the device according to 1 ;
• 3a a modification of the device according to 3 wherein the induction coil is divided into two mutually pivotable coil halves;
• 4 a partial section through the device according to 3 along the line IV-IV ;
• 5 a partial section through the device according to 3 along the line VV ;
• 6 a section through the induction coil in a modified embodiment;
• 7 a side view of the induction coil according to 6 ;
• 8th a view of the induction coil according to 6 along the line VIII-VIII ;
• 9 an induction coil according to 6 with two mutually pivotable parts with which associated Polscheibensegmente are firmly connected at the axial end;
• 10 an induction coil according to 3 with, at the axial end patch outer circular segment-shaped Polscheibensegmenten and inner straight Polscheibensegmenten that can be selectively adjusted or withdrawn and
• 11 an induction coil according to 3 , With attached at the axial end outer circular segment Polschibensegmenten that are radially adjustable.

In 1 is a device for inductive heating of a component in total with the digit 10 designated and shown in perspective. The device 10 has an induction coil 12 on, which is not completely closed according to the invention, but at one end an open area 16 having. On the upper, axial end of the induction coil 12 is a pole disk 18 of a magnetically conductive, non-electrically conductive material, namely a soft magnetic ferrite arranged.

The pole disk is used in a known manner to shield the magnetic field in the area outside the induction coil 12 ,

Inside of the induction coil 12 enclosed space is a component in the form of a shrink chuck 14 shown, which has a central clamping opening 15 for shrinking tools.

As a result of the open area 16 the induction coil 12 can the shrink chuck 14 laterally in the induction coil 12 On or be executed, contrary to the known in the prior art fully closed induction coils, in which only an axial insertion is possible.

2 shows the device 10 in a cutaway view.

The more precise construction of the device 10 is from the following 3 to see.

The induction coil 10 has a winding 20 with several turns 30 on, with two coil ends 22 . 23 to the rear from the induction coil 12 stand out. The winding ends 22 . 23 can via connecting cables 25 . 26 with an AC voltage source 24 get connected.

The induction coil 12 extends over an angular range of 360 ° -α. The angle α, which is the opening angle of the open area 16 represents is as a central opening angle between the two ends 21 . 29 the induction coil 12 Are defined. The angle α is in the illustrated case slightly smaller than 90 ° and is about 88 °.

The maximum diameter D _max a shrink chuck 14 that enters the induction coil 12 can be moved in and out, D _max = sin α / 2 · D _i , where D _i the inner diameter of the induction coil 12 is. Has the induction coil 12 For example, an inner diameter D _i of 70 mm, then the maximum diameter D _max at an opening angle α of 88 ° about 49 mm.

It has been found that, surprisingly, despite the not completely closed induction coil, a largely homogeneous heating of a shrink chuck is possible. The induced eddy currents flow through the entire shrink chuck, despite an imperfect loop through the induction coil. The special type in the coil geometry uses the in the Induction heating caused by the AC current effect of the current displacement such that without further aids an eddy current the rotationally symmetric shrink chuck 14 permeated so that the shrink chuck 14 is heated largely homogeneously along its outer circumference.

The structure of the winding 20 and the location of the individual turns 30 are from the two sectional views according to the 4 and 5 closer.

In 4 is also an example of a tool 32 pictured with his tool shank 34 in the tension opening 15 of the shrink chuck 14 is included.

The efficiency of the induction coil 12 can by the arrangement of the pole disk 18 at the axial end and optionally by a cylindrical jacket 36 that the induction coil 12 from the outside, to be improved. Both the pole disk 18 as well as the coat 36 consist of a magnetically conductive, non-electrically conductive material, in the present case of a soft magnetic ferrite.

3a shows a modified embodiment of the induction coil 12a , which is formed with two relatively rotatable coil parts, so as to laterally with a given inner diameter of the induction coil larger shrink chuck than explained above to run or execute. The structure will be described below with reference to 6 to 8th explained in more detail.

The total with 12a designated induction coil has two coil halves 40 . 42 on, which are each formed as separate coil parts and according to 8th only in one place via a flexible electrical connection 44 connected to each other. The two coil parts 40 . 42 are according to 6 and 8th at one point about a joint 31 connected to each other pivotally.

Such a configuration of the induction coil 12a allows larger shrink chucks 14 laterally introduce into the coil inside or execute, as this with a fixed induction coil 12 according to 1 to 3 the case is.

Although the angle could be α be enlarged, even with a fixed induction coil, the on or run diameter D _max to increase, however, would have an increase in the angle α the disadvantage that the efficiency of the induction coil would be reduced.

The 9 to 11 show different variants of a composite of several segments Polscheibe.

According to 9 is at an induction coil 12a according to 3 a consists of two mutually pivotable coil parts, a pole disc 18a provided at the axial end, consisting of two segments 60 . 61 consists, each firmly connected to a coil part.

According to 10 is at an induction coil 12 according to 3 a pole disk 18b with two outer, circular segment-shaped segments 46 . 48 provided, between which inner straight segments 49 . 50 . 51 are arranged radially adjustable or pulled out.

According to 11 is at an induction coil 12 according to 3 a pole disk 18c with four circular segments 53 . 54 . 55 . 56 provided, which are radially adjustable, as by the double arrows 57 is indicated. The segments 53 . 54 . 55 . 56 can also be biased inwards by springs.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 20203784 U1 [0005]

Claims (14)

Device for inductive heating of a component, in particular for shrinking or shrinking a tool (32) within a clamping opening (15) of a shrink chuck (14), with an induction coil (12, 12a) into which the component can be inserted, and with an AC voltage source ( 24) to which the induction coil (12, 12a) is connectable, characterized in that the induction coil (12, 12a) in the circumferential direction has an open area (16) with two opposite ends (21, 29). Device after Claim 1 , characterized in that the induction coil (12, 12a) extends over an angular range of 360 ° - α, wherein α is at most 180 °, preferably at most 150 °, more preferably at most 120 °, particularly preferably at most 100 °. Device after Claim 1 or 2 , characterized in that the induction coil (12, 12a) has a number of turns n which is greater than 1, preferably greater than 5. Device according to one of the preceding claims, characterized in that the induction coil (12, 12a) has a magnetically conductive, non-electrically conductive core (28) which is surrounded by the turns of the induction coil (12, 12a). Device according to one of the preceding claims, characterized in that at one axial end of the induction coil (12, 12a) a pole disc (18) made of a magnetically conductive, preferably soft magnetic, non-electrically conductive material is arranged, which has a central recess (19) for Implementation of a in the clamping opening (15) engaging tool (32). Device after Claim 5 , characterized in that the pole disk has a plurality of segments. Device after Claim 6 , characterized in that the segments are arranged radially adjustable, preferably resiliently acted upon radially inwardly. Device after Claim 6 or 7 , characterized in that the segments are formed in a circular segment or circular segment. Device according to one of Claims 5 to 8th , characterized in that a plurality of straight segments between outer circular segment-shaped segments is provided, wherein the inner straight segments are laterally adjustable or retractable. Device according to one of the preceding claims, characterized in that the induction coil (12, 12a) on the outside of a jacket (36) of a magnetically conductive, preferably soft magnetic, non-electrically conductive material is at least partially enclosed. Device according to one of Claims 5 to 10 , characterized in that at least the pole disk and / or the jacket (36) consists of a ferrite material. Device according to one of the preceding claims, characterized in that the induction coil (12a) has at least two relatively rotatable coil parts (40, 42). Device after Claim 12 , characterized in that each coil part (40, 42) is formed as a separate coil part, and that the two coil parts (40, 42) via an electrically conductive, flexible connection (44) are interconnected. Device after Claim 12 or 13 , characterized in that a pole disc is composed of a plurality of segments, wherein each coil member is fixedly connected to a segment at its axial end.

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