US3812318A - Apparatus for welding,fusing or heating workpiece utilizing energy of a light beam - Google Patents

Apparatus for welding,fusing or heating workpiece utilizing energy of a light beam Download PDF

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Publication number
US3812318A
US3812318A US00309000A US30900072A US3812318A US 3812318 A US3812318 A US 3812318A US 00309000 A US00309000 A US 00309000A US 30900072 A US30900072 A US 30900072A US 3812318 A US3812318 A US 3812318A
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US
United States
Prior art keywords
cooling fluid
focus
elliptical mirror
light
mirror
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.)
Expired - Lifetime
Application number
US00309000A
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English (en)
Inventor
S Yoshizumi
Y Matsumoto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 claimed from JP46095472A external-priority patent/JPS5214694B2/ja
Priority claimed from JP46099980A external-priority patent/JPS514192B2/ja
Priority claimed from JP46100350A external-priority patent/JPS4865145A/ja
Priority claimed from JP46100351A external-priority patent/JPS4865146A/ja
Priority claimed from JP46103060A external-priority patent/JPS4867154A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3812318A publication Critical patent/US3812318A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/005—Soldering by means of radiant energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0033—Heating devices using lamps
    • H05B3/0038—Heating devices using lamps for industrial applications
    • H05B3/0061—Heating devices using lamps for industrial applications for metal treatment

Definitions

  • ABSTRACT An apparatus for welding, fusing or heating a workpiece utilizing the energy of a light beam comprising an eliptical mirror, a light source of high-temperature are disposed at a first focus of the elliptical mirror and means for holding the workpiece at a second focus of the elliptical mirror.
  • cooling means is disposed adjacent to the elliptical mirror for cooling the light source.
  • This invention relates to an apparatus for welding, fusing or heating workpieces by the energy of light, and more particularly to means for extending the service life of the apparatus, reducing the overall size of the apparatus and improving the efficiency of the apparatus.
  • a lamp emitting a high-temperature light is generally disposed at or adjacent to a first focus of an elliptical mirror and the energy of light is concentrated into a second focus of the mirror for welding, fusing or heating workpieces. of metal or like material.
  • the ratio b/a between the second focal distance b and the first focal distance a of the elliptical mirror is selected to be less than 8.
  • FIG. 1 is a schematic sectional view showing the structure of an embodiment of the present invention
  • FIG. 2 is a diagrammatic view showing three cooling fluid injection ports arranged in directions tangential to the outer periphery of the electrode portion shown in FIG. 1;
  • FIG. 3 is a schematic sectional view showing the structure of another embodiment of the present invention for welding, fusing or heating workpieces by the energy of light;
  • FIG. 4 is a schematic sectional view showing the structure of a further embodiment of the present invention.
  • FIG. 5 is a graph showing the relation between the angle of incidence 0 and the index of reflection of light when light advances into atmospheric air from a glass member employed in the present invention
  • FIG. 7 is a graph showing temperature variations relative to time in a piror art apparatus of this kind.
  • FIG. 8 is a schematic perspective view showing principal arts of another embodiment of the present invention.
  • FIG. 9 is a graph showing temperature variations and power consumption relative to time in the apparatus shown in FIG. 8.
  • an arc lamp S emitting a hightemperature light comprises an electrode portion R including electrodes and accessory parts.
  • the lamp Sis combined with an elliptical mirror E having a first focus F and a second focus F and is disposed at or adjacent to the first focus F of the elliptical mirror E.
  • At least two cooling fluid injection ports N are disposed at spaced positions between the first focus F and the second focus F of the elliptical mirror E with their openings directed toward the electrode portion R of the lamp S so as to direct a cooling fluid along a flow line LL.
  • the molecules of the cooling fluid can impinge directly against the excessively heated portions of the lamp S.
  • the apparatus having a structure as shown in FIG. 1 provides the following advantages among others:
  • the electrode portion (including the electrodes and accessory parts) and the portion of the hightemperature arc lamp extending from the position adjacent to the first focus F, toward the second focus F of the elliptical mirror as well as the space around these portions, can be cooled directly by a cooling medium, and thus, the service life of the high-temperature arc lamp can be remarkably extended.
  • the cooling efficiency can be remarkably improved due to the fact that the cooling fluid is directed to the most severely heated portions of the arc lamp and to the space around such portions in the welding, fusing or heating apparatus.
  • an open-ended outer casing 1 is formed by a plate of metal or like material, and a bottom plate 2 is secured to the lower end of the outer casing l.
  • a partition plate 3 is disposed intermediate between the upper and lower ends of the outer casing I, and an elliptical mirror 4 is mounted to the lower surface of the partition plate 3 by means of a mounting plate 5 and bolts 6.
  • a hightemperature are emitting lamp 7 is disposed at or adjacent to a first focus F of the elliptical mirror 4.
  • An opening 8 is provided in the bottom of the elliptical mirror 4 for supplying a cooling fluid into the internal space of the elliptical mirror 4.
  • the cooling fluid is supplied from a cooling fluid supply means 9 such as a blower disposed on the partition plate 3.
  • the cooling fluid supplied from the supplying means 9 is injected toward the lamp 7 through an injection nozzle 10 fitted in the bottom opening 8 of the elliptical mirror 4 for cooling the lamp 7.
  • the cooling fluid having cooled the lamp 7 flows through the space between the bottom plate 2 and the elliptical mirror 4 to be discharged from the outer casing l by a fluid discharging means 11 such as a sirocco fan disposed on the bottom plate 2.
  • a light shading plate 12 is movably disposed on the bottom plate 2 in the path of light so as to open or close an opening of the bottom plate 2.
  • the cooling can be attained with better efficiency when the cooling fluid supplying means 9 is isolated completely from the hightemperature are lamp 7 and elliptical mirror 4 by the partition plate 3.
  • This test carried out with an apparatus having an arrangement as above described has proved that the temperature rise at a point in the vicinity of the gas enclosing envelope portion of, for example, a 5 KW high-temperature arc lamp can be suppressed to about 100 to 120 C and the service life of the arc lamp can be remarkably extended, whereas a large temperature rise of from about 200 to 250 C occurs at such a point in a similar apparatus when it is not arranged in the manner described above.
  • the total volume of the former apparatus is of the order of 1.0 x 10 cm and is thusvery small, whereas the total volume of the latter apparatus including the cooling means is larger than 5.0 x 10 cm.
  • an elliptical mirror M is fixedly mounted by a fixing means 23 in a hermetically sealed outer casing 25, and a cooling fluid supplying duct 21 is connected to a bottom opening of the elliptical mirror M.
  • a high-temperature arc emitting lamp S is disposed within the elliptical mirror M at or adjacent to a first focus F of the elliptical mirror M, and its position is adjustable by adjusting means shown by the reference numeral 22.
  • a member A covers sealingly a bottom opening of the casing 25 and is fixed in such position by a fixing ring 24. This member A is such that it transmits the energy of light but does not allow for flow-out of a cooling fluid therethrough.
  • the light energy transmitting member A may be made of a material such as heat-resisting glass or plastic.
  • the casing 25 is provided with a cooling fluid discharging means (not shown) which discharges to the exterior the cooling fluid having cooled the source of high-temperature radiation.
  • a workpiece W is disposed at or adjacent to a second focus F of the elliptical mirror M. Due to the above arrangement, the cooling fluid having cooled the high-temperature arc lamp S does not impinge against the workpiece W by being intercepted by the light energy transmitting member A of heat-resisting glass.
  • the apparatus of the present invention having a structure as shown in FIG. 4 provides the following advantages among others:
  • the working efficiency is improved and stable working can be achieved due to the fact that the molecules of the cooling fluid do not impinge against the workpiece.
  • the shape of the light energy transmitting and cooling fluid intercepting member A of heat-resisting glass should be suitably selected to suit the apparatus of the present invention which utilizes the energy of light for welding, fusing and heating workpieces.
  • the angle of incidence 6 is selected to have a suitable value less than 30, the angle 4) is determined and the contour of the surface f is determined.
  • -y is the angle defined between the light path OL inside of the glass member A and the line Nf normal to the surface f at the intersection B between the light path 0L and the surface f2
  • 8 is the angle defined between the light path 0L outside of the glass member A and the normal Nf.
  • FIG. 6a shows the surface shape in which both the surface f, and f, are concentric around a point Os.
  • FIG. 6b shows the surface shape in which both the surface f, and f are portions of prolate spheroids.
  • FIG. 60 shows the surface shape comprising a combination of flat planes.
  • the refractive index n of the glass member A is preferably of the order of 1.45 to 1.7.
  • the use of the glass member having various surface shapes as shown in FIGS. 6a, 6b and 6c is advantageous in that undesirable reflection of the energy of light at the boundary between the glass member and the atmospheric air can be reduced to a minimum in addition to the advantages described with reference to the embodiment shown in FIG. 4.
  • a constant current or voltage is continuously supplied to the lamp for energizing the lamp and a light shading plate is suitably actuated to control the supply of the energy of light to a workpiece.
  • a large temperature rise occurs not only in the lamp but also at various portions of the apparatus as shown in FIG. 7 thereby shortening the service life of the lamp and deteriorating the welding, fusing or heating ability of the apparatus.
  • the lamp is energized at time Q, and working is carried out for a period of time T,, between the two periods of times '1, representing preparatory steps, before and after one working step.
  • the curves 0, b and c in FIG. '7 represent temperature variations at the lamp mounting portion, light condensing system and light shading plate respectively.
  • FIG. 9 shows, by way of example, temperature variations at various portions of the apparatus when the high-temperature radiation emitting lamp is energized at room temperature of 20 C and working is repeatedly carried out for a period of time T of about 10 minutes interposed between the two periods of times T of about 5 minutes representing preparatory steps prior to and subsequent to the working.
  • the curves a, b and c in FIG. 9 represent temperature variations at the lamp mounting portion, light .condensing system and light shading plate 31 respectively.
  • the highest temperatures appearing at the lamp mounting portion, light condensing system and light shading plate 31 are about 100 C, 50 C and C, respectively, which are about one-half or one-third of the values observed with the prior art apparatus of this kind. Further, large power consumption appears only during the working period of time and the total power consumption can be reduced to about two-thirds of the value required for the prior art apparatus.
  • the undesirable temperature rise at various portions of the apparatus according to the present invention can be reduced remarkably and this provides the advantage in that the service life of the apparatus, especially the service life of the high-temperature radiation emitting lamp can be remarkably extended. Further, the present invention provides a remarkable economical advantage in that the power consumption can be reduced to about 60 percent of prior requirements. Furthermore, by virtue of the low overall temperature rise, welding, fusing or heating can be satisfactorily carried out and the apparatus is reliably serviceable for operations over an extended period of time.
  • Apparatus for welding, fusing or heating a workpiece by irradiating said workpiece with electromagnetic radiation comprising: an elliptical mirror reflecting housing; a source of light energy located at a first focus of said mirror; means mounting said workpiece at a second focus of said mirror spaced from said first focus', a light energy permeable partition disposed between said tirst and second foci; cooling fluid injecting means located adjacent said mirror for injecting cooling fluid into said housing for cooling said source of light energy; and cooling fluid discharging means located adjacent said mirror for discharging cooling fluid from said housing; said injecting means and discharging means being separated from said second focus by said partition to prevent said cooling fluid from reaching said second focus.
  • An apparatus for welding, fusing or heating a workpiece utilizing the energy of light comprising: an
  • elliptical mirror a light source lamp of hightemperature radiation disposed at a first focus of said elliptical mirror; means for setting the workpiece at a second focus of said elliptical mirror; cooling fluid injecting means disposed adjacent to said elliptical mirror for injecting a cooling fluid for cooling said light source; cooling fluid discharging means disposed adjacent to said elliptical mirror for discharging the cooling fluid; an outer casing having a bottom plate with an opening therein; and a partition plate disposed within said outer casing at a position intermediate between said bottom plate and the top wall of said casing; said elliptical mirror being provided with an opening in the bottom thereof and mounted on the lower surface of said partition plate, said cooling fluid injection means being mounted on said partition plate and connected to said opening of said elliptical mirror for injecting the cooling fluid through said opening for cooling said light source, and said cooling fluid discharging means being mounted on said bottom plate for discharging the cooling fluid having cooled said light source.
  • An apparatus for welding, fusing or heating a workpiece utilizing the energy of light comprising an elliptical mirror, a light source lamp of hightemperature radiation disposed at a first focus of said elliptical mirror, said mirror having a bottom surface portion on the other side of said first focus from said second focus, means for setting the workpiece at adjacent to a second focus of said elliptical mirror, at least two cooling fluid injecting means disposed at a position near said second focus between said first and second focuses in such a manner that their injection ports are directed toward said light source, and cooling fluid discharging means connected to an opening in the bottom of said elliptical mirror.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Resistance Heating (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00309000A 1971-11-26 1972-11-24 Apparatus for welding,fusing or heating workpiece utilizing energy of a light beam Expired - Lifetime US3812318A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP46095472A JPS5214694B2 (enrdf_load_stackoverflow) 1971-11-26 1971-11-26
JP46099980A JPS514192B2 (enrdf_load_stackoverflow) 1971-12-09 1971-12-09
JP46100350A JPS4865145A (enrdf_load_stackoverflow) 1971-12-11 1971-12-11
JP46100351A JPS4865146A (enrdf_load_stackoverflow) 1971-12-11 1971-12-11
JP46103060A JPS4867154A (enrdf_load_stackoverflow) 1971-12-17 1971-12-17

Publications (1)

Publication Number Publication Date
US3812318A true US3812318A (en) 1974-05-21

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ID=27525745

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Application Number Title Priority Date Filing Date
US00309000A Expired - Lifetime US3812318A (en) 1971-11-26 1972-11-24 Apparatus for welding,fusing or heating workpiece utilizing energy of a light beam

Country Status (5)

Country Link
US (1) US3812318A (enrdf_load_stackoverflow)
CA (1) CA968855A (enrdf_load_stackoverflow)
FR (1) FR2161073B1 (enrdf_load_stackoverflow)
GB (1) GB1409896A (enrdf_load_stackoverflow)
NL (1) NL155705B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695705A (en) * 1986-02-14 1987-09-22 The J. M. Ney Company Apparatus and method for localized heating of an object at precise temperatures
WO1995018694A1 (fr) * 1994-01-04 1995-07-13 Nauchno-Proizvodstvennaya Firma 'mgm' Dispositif de brasage par faisceau lumineux
AT407261B (de) * 1997-04-23 2001-02-26 Boehler Uddeholm Ag Verfahren zur ausbildung einer schicht auf substrate durch aufbringen von thermischer energie
EP1428606A1 (en) * 2002-12-13 2004-06-16 General Electric Company Apparatus and method for performing welding at elevated temperature
EP2990171A1 (en) * 2014-08-21 2016-03-02 G.P. Consulting di Giuseppe Pritelli & C. S.a.s. Method and device for localised thermal-melting

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3416502A1 (de) * 1984-05-04 1985-11-07 Goldschmidt Ag Th Vorrichtung zum aushaerten von flaechigen werkstoffen aus durch uv-strahlung haertbaren verbindungen oder zubereitungen
NL8902971A (nl) * 1988-12-02 1990-07-02 Vickers Shipbuilding & Eng Werkwijze en inrichting voor het tot stand brengen van een warmtebeeld.
DE4001280A1 (de) * 1990-01-18 1991-07-25 Meyer Kobbe Clemens Vorrichtung zur oberflaechenbehandlung von werkstuecken mittels lichtstrahlen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570619A (enrdf_load_stackoverflow) * 1968-04-04 1969-06-13

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695705A (en) * 1986-02-14 1987-09-22 The J. M. Ney Company Apparatus and method for localized heating of an object at precise temperatures
WO1995018694A1 (fr) * 1994-01-04 1995-07-13 Nauchno-Proizvodstvennaya Firma 'mgm' Dispositif de brasage par faisceau lumineux
AT407261B (de) * 1997-04-23 2001-02-26 Boehler Uddeholm Ag Verfahren zur ausbildung einer schicht auf substrate durch aufbringen von thermischer energie
EP1428606A1 (en) * 2002-12-13 2004-06-16 General Electric Company Apparatus and method for performing welding at elevated temperature
US20040112940A1 (en) * 2002-12-13 2004-06-17 Caddell James Walter Apparatus and method for performing welding at elevated temperature
US7137544B2 (en) 2002-12-13 2006-11-21 General Electric Company Apparatus and method for performing welding at elevated temperature
US20070158321A1 (en) * 2002-12-13 2007-07-12 General Electric Company Apparatus and Method for Performing Welding at Elevated Temperature
EP2990171A1 (en) * 2014-08-21 2016-03-02 G.P. Consulting di Giuseppe Pritelli & C. S.a.s. Method and device for localised thermal-melting

Also Published As

Publication number Publication date
FR2161073A1 (enrdf_load_stackoverflow) 1973-07-06
DE2257739A1 (de) 1973-05-30
DE2257739B2 (de) 1977-04-21
CA968855A (en) 1975-06-03
GB1409896A (en) 1975-10-15
NL155705B (nl) 1978-01-16
FR2161073B1 (enrdf_load_stackoverflow) 1977-04-22
NL7215964A (enrdf_load_stackoverflow) 1973-05-29

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