DE102018116539B3 - Hand tool for induction straightening of magnetizable sheets - Google Patents

Abstract

Hand tool (10) for the induction straightening of magnetizable sheets, the hand tool comprising: - a central support frame (12) with a main axis (X-X) in the direction of which the hand tool is placed against the sheet to be magnetized; and - at least one induction device (s) (14) fastened to the support frame, the or each induction device having an inductor head (36) with a contact surface for contacting the surface of the sheet to be magnetized and thus for introducing one generated by the hand tool (10) alternating magnetic field in the sheet metal, characterized in that the hand tool comprises at least three induction devices (14) which are arranged at regular intervals around a circle and are attached to the support frame, each induction device (14) on the support frame (12) in the direction of the main axis (XX) of this type individually is displaceably mounted so that when the hand tool is placed on the sheet to be magnetized, each inductor head (36) can adjust its position to any unevenness in the sheet by moving it along the main axis, so that the contact surface rests on the sheet surface.

Description

The present invention relates to a hand tool for induction straightening of magnetizable sheets, the hand tool having a central support frame with a main axis ( XX ) in the direction of which the hand tool is placed on the sheet to be magnetized and comprises at least one induction device attached to the support frame, the or each induction device having an inductor head, with a contact surface for contacting the surface of the sheet to be magnetized and thus for introducing a sheet by the hand tool generated alternating magnetic field in the sheet.

Such a hand tool is made from the combination of the 1 and 6B the JP 2009-279606 known. This hand tool has three inductor heads, which together form a heating unit. As in 2A can be seen, each inductor head has a peripheral housing 4 by means of which he on the sheet to be straightened X is applied. There is an air gap C between the element supplying the alternating magnetic field 1a and the tin X , In addition, when using the hand tool, the heating unit is located on uneven sheets X only partially on their surface.

Other tools are out WO 99/48 334 A1 . DE 20 2015 009 073 U1 . FR 1 419 497 A . EP 2 085 161 A1 and WO 01/30 117 A1 known.

As a result, the alternating magnetic field is not optimal in the sheet X introduced and thus the sheet X only heated inaccurately.

It is therefore an object of the present invention to provide a hand tool for induction straightening of magnetizable sheets, which ensures that the alternating magnetic field is introduced into the sheet to be straightened as precisely and effectively as possible.

According to the invention, this object is achieved in the case of the hand tool introduced above in that the hand tool comprises at least three induction devices which are arranged at regular intervals around a circle and are fastened to the support frame, each induction device being individually displaceably mounted on the support frame in the direction of its main axis in such a way that when it is applied of the hand tool on the sheet to be magnetized, each inductor head can adjust its position to any unevenness in the sheet by moving it along the main axis, so that each contact surface lies against the sheet surface.

Because each induction device is individually displaceably mounted, each inductor head can adapt its position to the local surface of the sheet when the hand tool is applied in the direction perpendicular to the sheet. In the above-mentioned prior art, the three inductor heads define a rigid plane that can only partially abut an uneven sheet. Thanks to the displaceable mounting according to the invention, it is achieved that all inductor heads rest as well and completely as possible on the sheet to be straightened. This results in a better transfer of the alternating magnetic field into the sheet.

• - jede Induktionsvorrichtung ist über mindestens ein elastisches Element federnd am Traggestell gelagert;
• - jede Induktionsvorrichtung ist über genau vier Schraubenfedern federnd am Traggestell gelagert;
• - jeder Induktorkopf ist ein vorzugsweise L-förmiger, frei vorstehender Finger;
• - jedem Induktorkopf ist eine Kühlschleife integriert, mit einem Zulauf zum Zuführen von kaltem Kühlfluid (z.B. Wasser) und einem Ablauf zum Abführen von erwärmtem Kühlfluid (z.B. Wasser);
• - jede Induktionsvorrichtung umfasst des Weiteren eine Induktionseinheit mit einer Induktionsspule zur Erzeugung des magnetischen Wechselfelds und einen Stromanschluss zur Versorgung der Induktionsspule der Induktionseinheit mit hochfrequentem Wechselstrom;
• - jede Induktionsvorrichtung ist über ihre Induktionseinheit am Traggestell verschieblich gelagert;
• - das Handwerkzeug umfasst ferner einen Rundhalter, in welchem das zentrale Traggestell mitsamt den Induktionsvorrichtungen aufgenommen ist und einen Laufwagen, an dem der Rundhalter mitsamt zentralem Traggestell und Induktionsvorrichtungen um die Hauptachse drehbar gelagert ist, wobei der Laufwagen vorzugsweise eine Öse zur Aufhängung des Laufwagens an einem Werkzeughalter aufweist;
• - der Rundhalter ist über eine kreisförmige Führung, die in mindestens eine Laufrolle des Laufwagens eingreift, an dem Laufwagen drehbar gelagert;
• - einen Schutzbügel zum Schutz der Induktorköpfe.

According to preferred embodiments, the hand tool according to the invention comprises one, several or all of the following features, in all technically possible combinations:

• - Each induction device is resiliently mounted on the support frame via at least one elastic element;
• - Each induction device is resiliently mounted on the support frame via exactly four coil springs;
• - Each inductor head is a preferably L-shaped, freely protruding finger;
• - A cooling loop is integrated into each inductor head, with an inlet for supplying cold cooling fluid (eg water) and an outlet for discharging heated cooling fluid (eg water);
• - Each induction device further comprises an induction unit with an induction coil for generating the alternating magnetic field and a power connection for supplying the induction coil of the induction unit with high-frequency alternating current;
• - Each induction device is slidably supported by its induction unit on the support frame;
• - The hand tool further comprises a round holder in which the central support frame including the induction devices is received and a carriage on which the round holder together with the central support frame and induction devices is rotatably mounted about the main axis, the carriage being preferably an eyelet for hanging the carriage on one Has tool holder;
• - The circular holder is rotatably mounted on the carriage via a circular guide which engages in at least one roller of the carriage;
• - A protective bracket to protect the inductor heads.

• 1 eine perspektivische Ansicht des erfindungsgemäßen Handwerkzeugs ist; und
• 2 eine perspektivische Ansicht des zentralen Traggestells und der Induktionsvorrichtungen des Handwerkzeugs der 1 ist.

The invention will now be described in detail with reference to the drawings, in which:

• 1 is a perspective view of the hand tool according to the invention; and
• 2 a perspective view of the central support frame and the induction devices of the hand tool of 1 is.

The 1 shows a hand tool 10 for induction straightening of magnetizable sheets. This hand tool is preferably used for straightening walls of a welded car body of a rail vehicle. The straightening removes the welding distortion that occurs when the car body is welded. For this purpose, the hand tool is placed on the wall to be straightened. With the hand tool, an alternating magnetic field is introduced into an area of the wall, which heats this area. The desired leveling is achieved through the heating and subsequent cooling.

• - ein zentrales Traggestell 12 mit einer Hauptachse X-X in deren Richtung das Handwerkzeug an das zu magnetisierende Blech angelegt wird;
• - mindestens eine Induktionsvorrichtung 14, welche am Traggestell befestigt ist;
• - einen Rundhalter 16, in welchem das zentrale Traggestell 12 mitsamt den Induktionsvorrichtungen 14 aufgenommen ist;
• - einen Laufwagen 18, an dem der Rundhalter 16 mitsamt zentralem Traggestell 12 und Induktionsvorrichtungen 14 um die Hauptachse X-X drehbar gelagert ist;
• - einen an dem zentralen Traggestell 12 befestigten Schutzbügel 20; und
• - einen an dem zentralen Traggestell 12 gegenüber dem Schutzbügel 20 befestigten Griff 22.

The hand tool 10 includes the following parts:

• - a central support frame 12 with a major axis XX in the direction of which the hand tool is placed against the sheet to be magnetized;
• - At least one induction device 14 , which is attached to the support frame;
• - a round holder 16 , in which the central support frame 12 together with the induction devices 14 is included;
• - a carriage 18 on which the round holder 16 with a central support frame 12 and induction devices 14 around the main axis XX is rotatably mounted;
• - One on the central support frame 12 attached protective bar 20 ; and
• - One on the central support frame 12 opposite the protective bar 20 attached handle 22 ,

In the illustrated embodiment, the hand tool comprises 10 three induction devices arranged at regular intervals around a circle 14 , which are attached to the support frame.

The central support frame 12 , please refer 2 , includes a core 24 and three legs 26 , Preferably, the support frame 12 integrally formed. The cross-section has the support frame 12 the shape of a three-pointed star. Every thigh 26 spans an angle a of 120 ° with each adjacent leg.

Between two legs 26 is an induction device 14 arranged. Any induction device 14 is on the support frame 12 in the direction of its main axis XX individually moveable. More specifically, the storage is carried out via four coil springs 28 , Each induction device has this 14 over a housing 30 with housing tabs 32 , on which the coil springs 28 support with one end. The coil springs are supported at their other end 28 on frame tabs 34 off that on the thighs 26 are attached.

Any induction device 14 includes one behind the other in the direction of the main axis XX an inductor head 36 , an induction unit 38 as well as a power connection 40 , The induction unit 38 houses an induction coil for generating an alternating magnetic field. The power connector 40 is used to supply the induction coil with high-frequency alternating current.

Every inductor head 36 has a contact surface 42 for contacting the surface of a sheet to be magnetized and thus for introducing one through the hand tool 10 generated alternating magnetic field in the sheet.

Every inductor head 36 is a preferably L-shaped, freely protruding finger. The inductor heads are preferably made of copper. Every finger has a base 44 , a footbridge 46 and a free end 48 , Over the base 44 every finger is on an induction unit 38 attached, for the inductive transmission of the magnetic alternating field from the induction unit 38 in the finger 36 , Every footbridge 46 preferably has two branches running in parallel 50 through a crack 52 are separated. In the area of the free end 48 the two branches merge and form a loop. Downtown 54 every loop is a bet 56 arranged. The stakes 56 are used to center the magnetic field and are made of magnetic metal.

In every inductor head 36 A cooling loop is integrated, with an inlet for the supply of cold cooling fluid (e.g. water) and an outlet for the discharge of heated cooling fluid (e.g. water). This cooling loop runs inside, from a web 50 about the free end 48 to the other jetty 50 ,

The free ends 48 are opposite the piers 46 angled, e.g. by approx. 90 °. Preferably the free ends 48 facing each other. Two free ends each 48 together span an angle b of, for example, 120 °.

The round holder 16 , please refer 1 , is a cylindrical sleeve, which is the central support frame 12 together with the induction devices 14 takes in. The sleeve 16 has one with its longitudinal axis along the main axis XX running cylindrical body 58 , To the main body 58 closes at one longitudinal end 60 a mounting flange 62 on. The mounting flange 62 has three attachment points 64 , each with one leg 26 of the support frame 12 is rotatably attached.

At the other longitudinal end 66 of the basic body 58 is a circular guide 68 educated.

The carriage 18 has two pairs of castors 70 which encompass a section of the circular guide. In addition, the carriage has 18 an eyelet 72 for hanging the carriage on a tool holder.

The steering wheel shaped handle 22 is for holding and adjusting the hand tool 10 as well as for turning the round holder 16 opposite the carriage 18 at one end of the support frame 12 attached. At the opposite end of the frame 12 is the protective bar 20 assembled. It protects the inductor heads 36 from damage. The free ends protrude 48 the inductor heads 36 over the protective bar 20 out.

There is now the use of the hand tool according to the invention 10 described.

To straighten a magnetizable sheet, the sheet is first positioned in front of the worker with the side to be straightened. Then the worker hangs the hand tool 10 by means of the eyelet 72 into a tool holder hanging from the ceiling. This means that the worker does not have to weigh the hand tool himself 10 wear and can use this easier. Now the worker brings the contact areas 42 the inductor heads 36 in contact with the point of the sheet to be straightened. Thanks to the slidable mounting of the induction devices according to the invention 14 , any inductor head 36 its position along the longitudinal axis XX adapt to the local condition of the sheet surface. This ensures that every contact surface 42 comes into direct contact with the sheet metal surface. In particular, there is no significant air gap between the contact surfaces 42 and the sheet surface, so that the alternating magnetic field can heat the sheet with good efficiency.

The worker aligns the sheet according to a certain pattern. Using the three contact surfaces 42 three points are always heated at the same time and then the hand tool 10 shifted horizontally to heat three adjacent points. In this way, an entire line of the sheet is straightened. Then the hand tool 10 moved vertically to align a new line. Before the new line is straightened, the round holder first 16 opposite the carriage 18 by turning the handle 22 rotated by 60 °.

Claims (10)

Hand tool (10) for the induction straightening of magnetizable sheets, the hand tool comprising: - a central support frame (12) with a main axis (XX) in the direction of which the hand tool is placed against the sheet to be magnetized; and - at least one induction device (s) (14) fastened to the support frame, the or each induction device having an inductor head (36) with a contact surface (42) for contacting the surface of the sheet to be magnetized and thus for introducing one by the hand tool (10) generated alternating magnetic field in the sheet metal, characterized in that the hand tool comprises at least three induction devices (14) which are arranged on the support frame and are arranged at regular intervals around a circle, each induction device (14) on the support frame (12) in the direction of its main axis ( XX) is individually displaceably mounted such that when the hand tool is placed on the sheet to be magnetized, each inductor head (36) can adjust its position to any unevenness in the sheet by shifting along the main axis, so that each contact surface (42) rests on the sheet surface. Hand tool after Claim 1 Each induction device (14) is resiliently mounted on the support frame (12) via at least one elastic element (28). Hand tool after Claim 2 , wherein each induction device (14) is resiliently mounted on the supporting frame via exactly four coil springs (28). Hand tool according to one of the preceding claims, wherein each inductor head (36) is a preferably L-shaped, freely projecting finger. Hand tool according to one of the preceding claims, wherein a cooling loop is integrated in each inductor head (36), with an inlet for supplying cold cooling fluid (e.g. water) and an outlet for removing heated cooling fluid (e.g. water). Hand tool according to one of the preceding claims, wherein each induction device (14) further comprises: a) an induction unit (38) with an induction coil for generating the alternating magnetic field; and b) a power connection (40) for supplying the induction coil of the induction unit with high-frequency alternating current. Hand tool after Claim 6 , wherein each induction device (14) is displaceably mounted on the support frame via its induction unit (38). Hand tool according to one of the preceding claims, further comprising: - A round holder (16) in which the central support frame together with the induction devices (14) is received; and - A carriage (18) on which the round holder together with the central support frame and induction devices is rotatably mounted about the main axis (X-X), the carriage preferably having an eyelet (72) for hanging the carriage on a tool holder. Hand tool after Claim 8 , wherein the round holder (16) is rotatably mounted on the carriage via a circular guide (68) which engages in at least one roller (70) of the carriage. Hand tool according to one of the preceding claims, further comprising a protective bracket (20) for protecting the inductor heads (36).

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