US3137752A - Rotary salt bath furnaces - Google Patents

Rotary salt bath furnaces Download PDF

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US3137752A
US3137752A US779319A US77931958A US3137752A US 3137752 A US3137752 A US 3137752A US 779319 A US779319 A US 779319A US 77931958 A US77931958 A US 77931958A US 3137752 A US3137752 A US 3137752A
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pot
housing
salt
bath
periphery
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Ankersen Borge Richard
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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
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths

Definitions

  • the container is a saucer shaped refractory pot mounted for rotation at its axis and carrying wheel members adjacent its periphery for support thereof during'rotation.
  • the housing over the pot is a frusto-conical refractory member whose edges dip beneath the surface of the salt at a point spaced from the inner wall of the pot.
  • burner means are provided in the housing in a position to direct its flame onto the upper surface of the bath of salt and outlet means are provided in the housing spaced from the bath for egress of combustion gases.
  • this housing is supported by supporting members extending over the top of the pot at a point outside the periphery of the pot whereby the pot is free to rotate with respect to the housing.
  • Means are preferably provided spaced apart along the periphery of the pot for loading or unloading the articles to be treated.
  • FIGURE 1 is a top plan view of a preferred form of my invention
  • FIGURE 2 is a side elevation of the furnace shown in FIGURE 1;
  • FIGURE 3 is a section on the line III-III of FIGURE 1; and l FIGURE 4 is. a transverse section through a second embodiment of my invention.
  • the other ends of the radial members 11 are provided with wheels 15 rotatable on the circular track 16.
  • Angularly extend- 3,137,752 Patented June 16, 1964 rce ing beams 17 are fixed to the radial members 11 adjacent each end and are held rigidly in position by vertical supports 18.
  • the members 11 and 17 form a generally saucer shaped framework which supports a refractory bowl made up of brickwork 19 and a refractory lining 20.
  • a circular rack gear 21 surrounds the pot and is attached to the supporting members 17 adjacent and connected with vertical supports 18.
  • the rack is driven by a pinion gear 22 connected to an electric motor through a gear train, not shown.
  • a supporting framework 23 is mounted on vertical legs 24 lying outside the periphery of the pot Ill and supported on the working floor 25. The members 23 extend over pot 10 and are spaced therefrom.
  • frusto-conical housing 26 is suspended from supporting members 23 by roof supports 27.
  • the housing 26 communicates with a stack28 which extends vertically above the axis of the pot 10.
  • Burners 29 are mounted in the housing 26 to be directed angularly towards the refractory hearth 20.
  • the hearth 20 has an inner generally conical elevated central portion 30 over which the salt bath 31 extends.
  • the lower edge 26a of the housing extends beneath the surface of the salt and is spaced from hearth 20 to provide an opening 32 into the salt 31.
  • a conveyor 33 is preferably provided at a tangent to theperiphery of the furnace to carry articles to be treated to the edge of the hearth 20.
  • An hydraulically operated load arm 34 is mounted adjacent the circumference of hearth 20 and is adapted to push an object 35 to be treated downwardly along the hearth wall 20 to the position shown in dotted lines on FIGURE 3.
  • An unloading arm 37 is mounted on the framework 23 and is adapted to rest beneath the surface of the bath 31 and to engage the end of an article being treated by a hook member 37a, draw the article 36 upwardly along the hearth wall 20 and to discharge onto a conveyor 38.
  • the operation of my invention is as follows.
  • the bath 31 is heated by the flames from burners 29 to the desired high temperature molten state.
  • the articles to be treated36 are heated to the desired temperature and carried to the position where the unloading arm 37 can engage them and draw them out of the bath onto conveyor 38.
  • Articles are thereafter continuously loaded by the loading arm 34 and unloaded by unloading arm 37 as the hearth slowly rotates.
  • a saucer shaped pot 50 made up of radially extending base members 51 connected together at the center on a pivot pin 52 rotatable in a hollow supporting member 53 on ball bearings 54.
  • the outer ends of the radial members 51 are provided with wheels 55 rotatable on a track 56.
  • Angularly extending beams 57 are fixed to the radial members .51 adjacent their outer ends and held rigidly by vertical members 58; This; framework supports a refractory bowl 59.
  • a circular rack gear 60 surrounds the pot and is attached to supports 57.
  • the rack 60 is driven by a pinion 61 connected to a motor, not shown.
  • a supporting framework 62 is mounted on legs 63 outside the pot and resting on work floor 64.
  • a frusto-conical housing 65 is suspended from framework 62 over the center of the pot 50 and the edge of the housing extends beneath the surface of the pool of salt 66.
  • Electrodes 67 pass through openings 68 adjacent the center of the housing into the pool of salt. Electrodes 67 are energized from a conventional source of electrical energy by means of the conventional connections and these are accordingly not illustrated.
  • the operation of the furnace is identical with that of FIGURES 1 through 3 a 3 except for the source of heat energy delivered to the salt pool.
  • a salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship around its periphery forming a separate heating chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery in the housing.
  • a salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing suspended above said pot and independent'thereof covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship around its periphery forming a separate heating chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing.
  • a salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, drive means adapted to rotate said pot about its axis, a bath of salt in said pot below the level of the top of the pot, an open bottom generally frusto-conical housing covering a portion of the surface of said salt, the outer bottom periphery of said housing extending beneath the surface of the salt in sealing relationship spaced from the inner wall of the pot,
  • a salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, drive means adapted to rotate said pot about its axis, a bath of salt in said pot .below the level of the top of the pot, an open bottom generally frusto-conical housing covering a portion of the surface of said salt, the outer bottom periphery of said housing extending beneath the surface of the salt in sealing relationshp spaced from the inner wall of the pot forming a separate heating chamber, burner means in said housing directed generally onto the surface of the bath and an outlet means at the apex of the housing permitting egress of combustion gases from the housing.
  • a salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, rack means on the pot spaced radially from the axis thereof, pinion drive means in driving engagement with said rack, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot to form a separate work opening into the pot, the open periphery of said housing extending beneath the surface of the salt in sealing relationship to form a separate combustion chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from housing.
  • a salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, rack means on the pot spaced radially from the axis thereof, pinion drive means in driving engagement with said rack, a bath of salt in said pot below the level of the top of the pot, an open bottom housing suspended above the pot and independent thereof, said housing covering a portion of the surface of said salt and spaced from the periphery of the pot to form a separate work opening therebetween into the pot, the open periphery of said housing extending beneath the surface of the salt in sealing relationship 'to form a separate combustion chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing.
  • a salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing rela-.
  • a salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship spaced from the pot and forming a heating zone therein and heating means in said housing adapted to introduce heat into the salt in said heating zone.
  • a salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship spaced from the pot and forming a heating zone therein, spaced heating electrodes extending into said bath of salt beneath said housing and connections from a source of electrical energy to said electrodes whereby said salt may be heated.

Description

June 1964 B. R. ANKERSEN 3,137,752
ROTARY SALT BATH FURNACES Filed Dec. 10, 1958 2 Sheets-Sheet 1 Fig.!
Fig.2.
m VEN TOR.
l6 I3 I Borge Richard Ankersen HIS ATTORNEYS United States Patent 3,137,752 ROTARY SALT BATH FURNACES Borge Richard Anlrersen, R0. Box 989, Butler, Pa.
Filed Dec. 10, 1958, Ser. No. 779,319 I 9 Claims. (Cl. 266-4) receiving metal articles to be heated, carrying those articles through a heating medium out of contact with the atmosphere or corrosive gases and discharging the heated objects after they have attained the desired temperature level. Various types of travelling hearth furnaces have been proposed for heating metal objects. However, they have either permitted the products of cornbustion and the atmosphere or both to be in contact with the articles or they have required special gaseous atmospheres in order to avoid contact with the atmosphere and corrosive gases.
I have invented a furnace and a method of heating metal articles which eliminates these problems and provides means for heating metal objects free from the corrosive influences of furnace gases or atmosphere. I provide a container pivotally mounted for rotation onits bottom, means for rotating the container about said pivotalmounting, a bath of salt in said container below the level of the top thereof, a housing suspended above said container and extending into the bath of salt about the periphery spaced from the walls of the container whereby to form an access opening between the container and the periphery of the housing, heating means in the housing in a position to act upon the bath of salt. Preferably, the container is a saucer shaped refractory pot mounted for rotation at its axis and carrying wheel members adjacent its periphery for support thereof during'rotation. Preferably, the housing over the pot is a frusto-conical refractory member whose edges dip beneath the surface of the salt at a point spaced from the inner wall of the pot. In a preferred form burner means are provided in the housing in a position to direct its flame onto the upper surface of the bath of salt and outlet means are provided in the housing spaced from the bath for egress of combustion gases. Preferably, this housing is supported by supporting members extending over the top of the pot at a point outside the periphery of the pot whereby the pot is free to rotate with respect to the housing. Means are preferably provided spaced apart along the periphery of the pot for loading or unloading the articles to be treated.
In the foregoing general description, I have set out certain objects, purposes and advantages of my invention. Other objects, purposes and advantages will be apparent from a consideration of the following description and the accompanying drawings inyvhich,
FIGURE 1 is a top plan view of a preferred form of my invention;
FIGURE 2 is a side elevation of the furnace shown in FIGURE 1;
FIGURE 3 is a section on the line III-III of FIGURE 1; and l FIGURE 4 is. a transverse section through a second embodiment of my invention.
. Referring to the drawings Ihave illustrated a preferred form of my furnace having a saucer shaped pot made up of radially extending base members 11 connected together at the center on a pivot pin 12 rotatable in a hollow supporting member 13 on ball bearings 14. The other ends of the radial members 11 are provided with wheels 15 rotatable on the circular track 16. Angularly extend- 3,137,752 Patented June 16, 1964 rce ing beams 17 are fixed to the radial members 11 adjacent each end and are held rigidly in position by vertical supports 18. The members 11 and 17 form a generally saucer shaped framework which supports a refractory bowl made up of brickwork 19 and a refractory lining 20. A circular rack gear 21 surrounds the pot and is attached to the supporting members 17 adjacent and connected with vertical supports 18. The rack is driven by a pinion gear 22 connected to an electric motor through a gear train, not shown. A supporting framework 23 is mounted on vertical legs 24 lying outside the periphery of the pot Ill and supported on the working floor 25. The members 23 extend over pot 10 and are spaced therefrom. A
frusto-conical housing 26 is suspended from supporting members 23 by roof supports 27. The housing 26 communicates with a stack28 which extends vertically above the axis of the pot 10. Burners 29 are mounted in the housing 26 to be directed angularly towards the refractory hearth 20. Preferably, the hearth 20 has an inner generally conical elevated central portion 30 over which the salt bath 31 extends. The lower edge 26a of the housing extends beneath the surface of the salt and is spaced from hearth 20 to provide an opening 32 into the salt 31. A conveyor 33 is preferably provided at a tangent to theperiphery of the furnace to carry articles to be treated to the edge of the hearth 20. An hydraulically operated load arm 34 is mounted adjacent the circumference of hearth 20 and is adapted to push an object 35 to be treated downwardly along the hearth wall 20 to the position shown in dotted lines on FIGURE 3. An unloading arm 37 is mounted on the framework 23 and is adapted to rest beneath the surface of the bath 31 and to engage the end of an article being treated by a hook member 37a, draw the article 36 upwardly along the hearth wall 20 and to discharge onto a conveyor 38.
The operation of my invention is as follows. The bath 31 is heated by the flames from burners 29 to the desired high temperature molten state. Articles to be treated'are loaded on the hearth 20 by the loading arm 34 as the hearth is rotated about the pivot pin 12 on wheels 15 by the rack and pinion 21, 22. As the hearth rotates the articles to be treated36 are heated to the desired temperature and carried to the position where the unloading arm 37 can engage them and draw them out of the bath onto conveyor 38. Articles are thereafter continuously loaded by the loading arm 34 and unloaded by unloading arm 37 as the hearth slowly rotates.
Referring to the embodiment illustrated in FIGURE 4, I have shown a saucer shaped pot 50 made up of radially extending base members 51 connected together at the center on a pivot pin 52 rotatable in a hollow supporting member 53 on ball bearings 54. The outer ends of the radial members 51 are provided with wheels 55 rotatable on a track 56. Angularly extending beams 57 are fixed to the radial members .51 adjacent their outer ends and held rigidly by vertical members 58; This; framework supports a refractory bowl 59. A circular rack gear 60 surrounds the pot and is attached to supports 57. The rack 60 is driven by a pinion 61 connected to a motor, not shown. A supporting framework 62 is mounted on legs 63 outside the pot and resting on work floor 64. .A frusto-conical housing 65 is suspended from framework 62 over the center of the pot 50 and the edge of the housing extends beneath the surface of the pool of salt 66. Electrodes 67 pass through openings 68 adjacent the center of the housing into the pool of salt. Electrodes 67 are energized from a conventional source of electrical energy by means of the conventional connections and these are accordingly not illustrated. The operation of the furnace is identical with that of FIGURES 1 through 3 a 3 except for the source of heat energy delivered to the salt pool.
While I have illustrated a present preferred embodiment of my invention, it will be distinctly understood that this invention may be otherwise embodied within the scope of the following claims.
I claim:
1. A salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship around its periphery forming a separate heating chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery in the housing.
2. A salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing suspended above said pot and independent'thereof covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship around its periphery forming a separate heating chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing.
3. A salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, drive means adapted to rotate said pot about its axis, a bath of salt in said pot below the level of the top of the pot, an open bottom generally frusto-conical housing covering a portion of the surface of said salt, the outer bottom periphery of said housing extending beneath the surface of the salt in sealing relationship spaced from the inner wall of the pot,
forming a separate heating chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing.
4. A salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, drive means adapted to rotate said pot about its axis, a bath of salt in said pot .below the level of the top of the pot, an open bottom generally frusto-conical housing covering a portion of the surface of said salt, the outer bottom periphery of said housing extending beneath the surface of the salt in sealing relationshp spaced from the inner wall of the pot forming a separate heating chamber, burner means in said housing directed generally onto the surface of the bath and an outlet means at the apex of the housing permitting egress of combustion gases from the housing.
5. A salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, rack means on the pot spaced radially from the axis thereof, pinion drive means in driving engagement with said rack, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot to form a separate work opening into the pot, the open periphery of said housing extending beneath the surface of the salt in sealing relationship to form a separate combustion chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from housing. v
6. A salt bath furnace comprising a saucer shaped pot adapted to be pivoted on its axis, rack means on the pot spaced radially from the axis thereof, pinion drive means in driving engagement with said rack, a bath of salt in said pot below the level of the top of the pot, an open bottom housing suspended above the pot and independent thereof, said housing covering a portion of the surface of said salt and spaced from the periphery of the pot to form a separate work opening therebetween into the pot, the open periphery of said housing extending beneath the surface of the salt in sealing relationship 'to form a separate combustion chamber, burner means in said housing and outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing. I
7. A salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing rela-.
tionship around its periphery forming a separate combustion chamber, burner means in said housing, outlet means in the housing permitting egress of combustion gases from the housing at a point spaced from the periphery of the housing, work feed means adjacent the periphery of the pot adapted to insert work to be treated into the saltbath and Work removal means adjacent said work feed means adapted to remove the work from said pot after rotation from the work feed means.
8. A salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship spaced from the pot and forming a heating zone therein and heating means in said housing adapted to introduce heat into the salt in said heating zone.
9. A salt bath furnace comprising a pot adapted to be pivoted about a point on the bottom thereof, drive means adapted to rotate said pot about said point, a bath of salt in said pot below the level of the top of the pot, an open bottom housing covering a portion of the surface of said salt and spaced from the periphery of the pot, said housing extending beneath the surface of the salt in sealing relationship spaced from the pot and forming a heating zone therein, spaced heating electrodes extending into said bath of salt beneath said housing and connections from a source of electrical energy to said electrodes whereby said salt may be heated.
References Cited in the file of this patent UNITED STATES PATENTS 1,628,012 Tracy May 10, 1927 p 2,168,028 Harsch Aug. 1, 1939 2,477,561 Holden Aug. 2, 1949 2,542,637 De Poy Feb. 20, 1951 2,611,693 Geyer Sept. 23, 1952 2,618,284 Purnell Nov. 18, 1952 2,697,596 Troglione Dec. 21, 1954 2,738,294 Sperce Mar. 13,1956 2,816,849 Ankersen Dec. 17, 1957 2,845,260 Rusciano July 29, 1958 2.888.506 Harris May 26. 1959

Claims (1)

1. A SALT BATH FURNACE COMPRISING A POT ADAPTED TO BE PIVOTED ABOUT A POINT ON THE BOTTOM THEREOF, DRIVE MEANS ADAPTED TO ROTATE SAID POT ABOUT SAID POINT, A BATH OF SALT INSAID POT BELOW THE LEVEL OF THE TOP OF THE POT, AN OPEN BOTTOM HOUSING COVERING APORTION OF THE SURFACE OF SAID SALT AND SPACED FROM THE PERIPHERY OF THE POT, SAID HOUSING EXTENDING BENEATH THE SURFACE OF THE SALT IN
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5326409A (en) * 1987-03-24 1994-07-05 Wyman-Gordon Company System for peripheral differential heat treatemnt to form dual-property workpiece

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1628012A (en) * 1923-05-29 1927-05-10 Harmon N Tracy Process and apparatus for metallizing ores
US2168028A (en) * 1938-01-12 1939-08-01 Leeds & Northrup Co Heat treating system
US2477561A (en) * 1944-06-20 1949-08-02 Artemas F Holden Method of heat-treating metal parts with a bright finish
US2542637A (en) * 1946-05-10 1951-02-20 Gen Motors Corp Method of rectifying a neutral salt heat-treating bath
US2611693A (en) * 1948-03-31 1952-09-23 Geyer Wallace Thomas Method for refining molten metal
US2618284A (en) * 1946-11-22 1952-11-18 United States Steel Corp Heat-treatment of hardenable steel
US2697596A (en) * 1952-07-22 1954-12-21 Loftus Engineering Corp Magnetic brake for quenching apparatus
US2738294A (en) * 1951-09-13 1956-03-13 Diamond Alkali Co Salt bath system and method for treating metals
US2816849A (en) * 1956-12-24 1957-12-17 Ankersen Borge Richard Furnaces and methods of heating
US2845260A (en) * 1954-04-09 1958-07-29 Metallurg Processes Co Neutral heating with controlled preheat
US2888506A (en) * 1957-06-17 1959-05-26 Lindberg Eng Co Salt bath furnace

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1628012A (en) * 1923-05-29 1927-05-10 Harmon N Tracy Process and apparatus for metallizing ores
US2168028A (en) * 1938-01-12 1939-08-01 Leeds & Northrup Co Heat treating system
US2477561A (en) * 1944-06-20 1949-08-02 Artemas F Holden Method of heat-treating metal parts with a bright finish
US2542637A (en) * 1946-05-10 1951-02-20 Gen Motors Corp Method of rectifying a neutral salt heat-treating bath
US2618284A (en) * 1946-11-22 1952-11-18 United States Steel Corp Heat-treatment of hardenable steel
US2611693A (en) * 1948-03-31 1952-09-23 Geyer Wallace Thomas Method for refining molten metal
US2738294A (en) * 1951-09-13 1956-03-13 Diamond Alkali Co Salt bath system and method for treating metals
US2697596A (en) * 1952-07-22 1954-12-21 Loftus Engineering Corp Magnetic brake for quenching apparatus
US2845260A (en) * 1954-04-09 1958-07-29 Metallurg Processes Co Neutral heating with controlled preheat
US2816849A (en) * 1956-12-24 1957-12-17 Ankersen Borge Richard Furnaces and methods of heating
US2888506A (en) * 1957-06-17 1959-05-26 Lindberg Eng Co Salt bath furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5326409A (en) * 1987-03-24 1994-07-05 Wyman-Gordon Company System for peripheral differential heat treatemnt to form dual-property workpiece

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