DE2122412A1 - Electron beam welded focusing device - Google Patents

Electron beam welded focusing device

Info

Publication number
DE2122412A1
DE2122412A1 DE19712122412 DE2122412A DE2122412A1 DE 2122412 A1 DE2122412 A1 DE 2122412A1 DE 19712122412 DE19712122412 DE 19712122412 DE 2122412 A DE2122412 A DE 2122412A DE 2122412 A1 DE2122412 A1 DE 2122412A1
Authority
DE
Germany
Prior art keywords
electron
welding
connecting line
electron beam
arrangement
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
DE19712122412
Other languages
German (de)
Other versions
DE2122412C3 (en
DE2122412B2 (en
Inventor
Jürgen Prof. Dr.-Ing.; Eggers Heiner Dipl.-Phys.; 3300 Braunschweig Rüge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Steigerwald Strahltecknik GmbH
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
Priority to DE2013950A priority Critical patent/DE2013950C3/en
Priority claimed from DE2013950A external-priority patent/DE2013950C3/en
Application filed by Steigerwald Strahltecknik GmbH filed Critical Steigerwald Strahltecknik GmbH
Priority to DE19712122412 priority patent/DE2122412C3/en
Priority claimed from DE19712122412 external-priority patent/DE2122412C3/en
Priority to DE19712141971 priority patent/DE2141971B2/en
Publication of DE2122412A1 publication Critical patent/DE2122412A1/en
Publication of DE2122412B2 publication Critical patent/DE2122412B2/en
Application granted granted Critical
Publication of DE2122412C3 publication Critical patent/DE2122412C3/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/21—Means for adjusting the focus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0013—Positioning or observing workpieces, e.g. with respect to the impact; Aligning, aiming or focusing electronbeams

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Welding Or Cutting Using Electron Beams (AREA)

Abstract

The two electron catchers for focussing the electron beam in the welder, which are disposed symmetrically relative to the weld beams and are controlled by suitable means are disposed such, that the imaginary connecting line between the weld location and each catcher is in the plane formed by the weld beam direction and the direction of welding. The arrangement improves beam focussing accuracy.

Description

Anordnung zum Fokussieren des Elektronenstrahls beim Elektronenstrahlschweißen Die Erfindung betrifft eine Anordnung zum Fokussieren des Elektronenstrahls beim Elektronenstrahlschweißen, bestehend aus zwei symmetrisch zum Schweißstrahl angeordneten Elektronenauffängern,die mit einem Regler, einem Anzeigeinstrument oder dergleichen als Steuervorrichtung für die optimale Fokus-Höhe verbunden sind,gemäß Patent ... ... (Aktenzeichen P 20 13 950.8). Arrangement for focusing the electron beam during electron beam welding The invention relates to an arrangement for focusing the electron beam at Electron beam welding, consisting of two symmetrically arranged to the welding beam Electron interceptors with a controller, a display instrument or the like are connected as a control device for the optimal focus height, according to patent ... ... (file number P 20 13 950.8).

Mit dieser Anordnung wird der von dem bewegten Werkstück rückgestreute Elektronenstrom aufgefangen, seine Intensität gemessen und der Strom zugleich als Eingangssignal für eine Steuervorrichtung verwendet, die kontinuierlich für eine hinsichtlich der Erzeugung fehlerfreier Schweißnähte optimale Fokus-Höhe sorgt. Dabei wird als Eingangssignal für die Steuervorrichtung der zwischen den beiden Elektronenauffängernbestehende Differenzstrom verwendet.With this arrangement, the backscattered from the moving workpiece Electron flow is captured, its intensity is measured and the current is used at the same time Input signal used for a control device, which is continuously for a ensures optimal focus height with regard to the creation of flawless weld seams. The input signal for the control device is the one between the two Electron collectors existing differential current is used.

Der Erfindung liegt die Aufgabe zugrunde, diese Anordnung so zu verbessern, daß die Steuervorrichtung mit der größten Genauigkeit und größten Reproduzierbarkeit anspricht.The invention is based on the object of improving this arrangement in such a way that that the control device with the greatest accuracy and greatest reproducibility appeals to.

Diese Aufgabe wird gemäß der Erfindung bei einer Anordnung der eingangs beschriebenen Art dadurch gelöst, daß die gedachte Verbindungslinie zwischen Schweißstelle und Elektronenauffänger mit dem Schweißstrahl einen Winkel von 500 bis 600 einschließt.According to the invention, this object is achieved in an arrangement of the type described at the outset described type solved in that the imaginary connecting line between the weld and electron collector makes an angle of 500 to 600 with the welding beam.

Bei einer Anordnung, wo die zwischen den beiden Elektronenauffängern gedachte Verbindungslinie parallel zum Bewegungsvektor des Werkstücks verläuft, ist es zweckmäßig, wenn diese Verbindungslinie in der durch die Schweißstrahlrichtung und die Schweißrichtung gebildeten Ebene liegt.In an arrangement where the between the two electron collectors the imaginary connecting line runs parallel to the motion vector of the workpiece, it is useful if this connecting line is in the direction of the welding beam and the direction of welding lies in the plane formed.

Bei dieser Anordnung der Elektronenauffänger ist das Differenzsignal am höchsten und die zeitlichen Steigungen des Differenzsignals am größten, d.h. die zeitliche erste Ableitung d(#I)/dt ist am grjoßten Daraus ergibt sich, daß die nachgeschaltete Steuervorrichtung bei dieser Auffängerstellung mit der größten Genauigkeit und größten Reproduzierbarkeit anspricht.With this arrangement of the electron collector, the difference signal is highest and the temporal slopes of the difference signal greatest, i.e. the temporal first derivative d (#I) / dt is greatest. It follows that the downstream control device with the greatest accuracy in this catcher position and the greatest possible reproducibility.

In der Zeichnung ist eine beispielsweise Anordnung gemäß der Erfindung dargestellt.In the drawing is an example of an arrangement according to the invention shown.

Danach sind zwei symmetrisch zu einem Schweißstrahl 3 angeordnete Elektronenauffänger 1, 2 vorgesehen, die die Intensität eines von einem bewegten Werkstück 5 rückgestreuten Elektronenstroms 8 messen. Der Differenzstrom zwischen diesen beiden Meßstellen dient als Eingangssignal für eine Steuervorrichtung 6, die ein Regler, ein Anzeigeinstrument oder dergleichen sein kann und den Strom einer elektromagnetischen Linse 7 derart steuert, daß zur Erzeugung fehlerfreier Schweißnähte ständig eine optimale Fokus-Höhe f eingehalten wird. Der Fokus ist mit 4 gekennzeichnet.Thereafter, two are arranged symmetrically to a welding beam 3 Electron catchers 1, 2 provided that the intensity of a moving one Measure workpiece 5 backscattered electron current 8. The differential current between these two measuring points serves as an input signal for a control device 6, which can be a controller, a display instrument or the like and the current of a electromagnetic lens 7 controls so that to produce flawless welds constant an optimal focus height f is maintained. The focus is marked with 4.

Bei richtiger Fokus-Höhe erzeugt der Schweißstrahl 3 auf der zu bearbeitenden Oberfläche des Werkstücks 5 eine Art Kapillare, die infolge der Bewegung des Werkstücks zu einer asymmetrischen Reflektion des Elektronenstromes 8 führt. Das erfinderische Verfahren beruht auf der Erkenntnis, daß der dadurch entstehende und von zwei entsprechend angeordneten Meßstellen zu messende Differenzstrom zur Beaufschlagung einer Steuervorrichtung herangezogen werden kann, die ihrerseits eine Justierung der Fokus-Höhe bewirkt, beispielsweise durch Beaufschlagung des Stroms der elektromagnetischen Linse 7.If the focus height is correct, the welding beam 3 generates on the one to be processed Surface of the workpiece 5 a kind of capillary, which as a result of the movement of the workpiece leads to an asymmetrical reflection of the electron stream 8. The inventive one Method is based on the knowledge that the resulting and two corresponding arranged measuring points to be measured differential current to act on a control device can be used, which in turn adjusts the focus height, for example, by applying the current to the electromagnetic lens 7.

Hat die Fokus-Höhe ihren optimalen Wert erreicht, wird zwischen den beiden Elektronenauffängern 1, 2 ein maximaler Differenzstrom gemessen, der bei größer bzw. kleiner werdender Fokus-Höhe geringer wird.When the focus height has reached its optimal value, between the a maximum differential current measured at the two electron collectors 1, 2 the larger or smaller the focus height becomes smaller.

Dabei spricht die Steuervorrichtung 6 dann mit der größten Genauigkeit und größten Reproduzierbarkeit an, wenn die gedachte Verbindungslinie 8 zwischen Schweißstelle und Elektronenauffänger 1 bzw. 2 mit dem Schweißstrahl 3 einen Winkel x von 50 bis 600 einschließt.The control device 6 then speaks with the greatest accuracy and greatest reproducibility when the imaginary connecting line 8 between Welding point and electron collector 1 or 2 form an angle with the welding beam 3 x includes from 50 to 600.

- Patentansprüche - - patent claims -

Claims (2)

Patentansprüche Anordnung zum Fokussieren des Elektronenstrahls beim Elektronenstrahl schweißen, bestehend aus zwei symmetrisch zum Schweißstrahl angeordneten Elektronenauffängern, die mit einem Regler, einem Anzeigeinstrument oder dergleichen als Steuervorrichtung für die optimale Fokus-Höhe verbunden sind, nach Patent ... ... (Aktenzeichen P 20 13 950.8), d a d u r c h g e k e n n z e i c h n e t , daß die gedachte Verbindungslinie (8) zwischen Schweißstelle und Elektronenauffänger (1 bzw. 2) mit dem Schweißstrahl (3) einen Winkel (a) von 50 bis 600 einschließt. Claims arrangement for focusing the electron beam when Electron beam welding, consisting of two symmetrically arranged to the welding beam Electron interceptors with a controller, a display instrument or the like connected as a control device for the optimal focus height, according to patent ... ... (file number P 20 13 950.8), d u r c h e k e n n n n e i c h n e t that the imaginary connecting line (8) between the weld and the electron collector (1 or 2) forms an angle (a) of 50 to 600 with the welding beam (3). 2. Anordnung nach Anspruch 1, wobei die zwischen den beiden Elektronenauffängern gedachte Verbindungslinie parallel zum Bewegungsvektor des Werkstücks verläuft, d a d u r c h g e k e n n z e i c h n e t , daß diese Verbindungslinie (9) in der durch die Schweißstrahlrichtung (3) und die Schweißrichtung (10) gebildeten Ebene liegt. 2. Arrangement according to claim 1, wherein the between the two electron collectors the imaginary connecting line runs parallel to the motion vector of the workpiece, d a d u r c h e k e n n n z e i c h n e t that this connecting line (9) in the plane formed by the welding beam direction (3) and the welding direction (10) lies.
DE19712122412 1970-03-24 1971-05-06 Arrangement for changing the focus position of an electron beam used for welding Expired DE2122412C3 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2013950A DE2013950C3 (en) 1970-03-24 1970-03-24 Method for changing the focus position along the beam axis of an electron beam used for welding
DE19712122412 DE2122412C3 (en) 1971-05-06 Arrangement for changing the focus position of an electron beam used for welding
DE19712141971 DE2141971B2 (en) 1970-03-24 1971-08-21 METHOD AND DEVICE FOR CHANGING THE FOCUS POSITION OF AN ELECTRON BEAM USED FOR WELDING

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2013950A DE2013950C3 (en) 1970-03-24 1970-03-24 Method for changing the focus position along the beam axis of an electron beam used for welding
DE19712122412 DE2122412C3 (en) 1971-05-06 Arrangement for changing the focus position of an electron beam used for welding

Publications (3)

Publication Number Publication Date
DE2122412A1 true DE2122412A1 (en) 1972-11-16
DE2122412B2 DE2122412B2 (en) 1975-10-23
DE2122412C3 DE2122412C3 (en) 1976-06-10

Family

ID=

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013573A1 (en) * 1979-01-12 1980-07-23 Messer Griesheim Gmbh Method and apparatus for regulating the position of a charged-particles beam in a charged-particles beam machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013573A1 (en) * 1979-01-12 1980-07-23 Messer Griesheim Gmbh Method and apparatus for regulating the position of a charged-particles beam in a charged-particles beam machine

Also Published As

Publication number Publication date
DE2122412B2 (en) 1975-10-23

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
8327 Change in the person/name/address of the patent owner

Owner name: MESSER GRIESHEIM GMBH, 6000 FRANKFURT, DE

8340 Patent of addition ceased/non-payment of fee of main patent