Source: https://patents.google.com/patent/US4272306
Timestamp: 2018-02-23 04:31:01
Document Index: 566568974

Matched Legal Cases: ['arts 12', 'arts 12', 'arts 12', 'arts 12', 'arts 12', 'arts 12']

US4272306A - Carburizing tub apparatus and method - Google Patents
Carburizing tub apparatus and method
US4272306A
US4272306A US06088722 US8872279A US4272306A US 4272306 A US4272306 A US 4272306A US 06088722 US06088722 US 06088722 US 8872279 A US8872279 A US 8872279A US 4272306 A US4272306 A US 4272306A
George E. Reisinger, Jr.
PCT No. PCT/US79/00792 Sec. 371 Date Sept. 27, 1979 Sec. 102(e) Date Sept. 27, 1979 PCT Filed Sept. 27, 1979
FIG. 1 illustrates an embodiment of the present invention wherein flow of a treating gas is upward externally of a column of tubs and a spacer member and downward through the column;
Adverting to FIG. 1 there is illustrated therein an apparatus 10 for contacting parts 12 with a gas. The apparatus 10 includes a plurality of open ended generally tubular tubs 14a, 14b, and 14c having flow impervious sidewalls 15a, 15b, 15c, the tubs 14a, 14b, 14c being substantially stacked together end-to-end to form a tubular column 16. The term "tubular" is used herein in its usual sense and includes rectangular and other cross-sectional shapes as well as the cylindrical shapes illustrated in the drawings. Each tub 14a, 14b and 14c has at least one end, 18a, 18b, 18c spanned by an open framework 20 which serves to maintain some of the parts 12 in each of the respective tubs 14a, 14b and 14c. A fan 22 serves as means 24 for impelling the gas to flow, as shown by the downwardly directed arrows in FIG. 1, sequentially through the tubs 14a, 14b and 14c from an entry end 26 of the column 16 to an exit end 28 thereof. The fan 22, in effect, provides a downward suction interiorly of the column 16. The exit end 28 of the column 16 would normally sit upon an open framework structure within an oven 29 and the gas would normally be conventionally regenerated externally of the oven to have sufficient carburizing gas content to properly carburize the various parts 12.
ALTERNATE EMBODIMENTS OF FIGS. 4 and 5
Adverting to FIG. 4 it will be seen that in a first alternate embodiment of the spacer member 31, the apertures 32' may be baffled as at 34' with the baffle 34' serving as means 36' for directing the gas flow shown in FIG. 1 to enter the apertures 32'.
In accordance with the present invention, a method of treating the surfaces of a plurality of parts 12 is thus provided by contacting them with a treating gas. The parts 12 are distributed in a plurality of open ended tubular tubs 14a, 14b and 14c having generally impervious sidewalls 15a, 15b and 15c, with the tubs each having at least the one end 18a, 18b or 18c thereof spanned by the open framework 20 which holds some of the parts 12 therein but which does not appreciably restrict flow of the treating gas therethrough. The tubs 14a, 14b and 14c are stacked end-to-end to form a column 16 having the entry end 26 into which the treating gas is flowed and the exit end 28 from which the treating gas exits. A supplemental flow of gas is introduced into the column through at least one aperture 32 located only in a selected area 33 in a spacer member 31 which forms a part of a lateral wall 52 of the column 16 intermediate the entry end 26 and the exit end 28 of the column 16. Generally, the parts will be metal and the treating will be carburizing of the surfaces of the parts, whereby both the treating gas and the supplemental gas will be carburizing gases. Means 36' or 36'' will usually be provided which will serve to direct the supplemental gas flow entering the apertures 32' or 32'' into the column 16.
The invention is particularly useful for treating parts which are to have their external surfaces carburized. Such parts as track bushings need such carburizing to provide for subsequent heat treating operations to improve the wear properties of the treated article. Also, piston pins need such carburizing to prevent cracking of the interior axial bores thereof due to insufficient carburization prior to hardening.
1. An apparatus (10) for controllably contacting a plurality of parts (12) with a gas, comprising:
a pair of tubular tubs (14b,14c) open at both ends, having flow impervious sidewalls (15b,15c) and an open framework (20) for holding the parts (12) within each respective tube (14b,14c); and
a tubular spacer member (31,31' or 31'') having an aperture (32,32' or 32'') extending laterally therethrough, the spacer member (31,31' or 31'') being located longitudinally between the tubs (14b,14c) in abutting relation thereto to define, with said tubs (14b,14c), a stacked column (16) and a first flow path for the gas longitudinally through the column (16), and the aperture (32,32' or 32'') defining a second flow path for ingress of the gas from exteriorly of said column (16) to the first flow path.
2. The apparatus (10) of claim 1, including:
means (24) for directing the gas serially through and generally exteriorly about the column (16).
3. The apparatus (10) of claim 1, wherein the sidewalls (15b,15c) are generally cylindrical, and the spacer member (31,31' or 31'') is generally cylindrical with a plurality of similar apertures extending (32,32' or 32'') radially therethrough.
7. The apparatus (10) of claim 1, including:
means (42) for interlockingly coupling the spacer member (31,31' or 31'') to the tubs (14b,14c).
8. The apparatus (10) of claim 6, wherein said means (42) includes a plurality of projections (44) and a plurality of recesses (49), the projections (44) being individually releasably received in the respective recesses (49).
10. A tubular spacer member (31) for placement between a pair of tubular tubs (14b,14c) open at both ends, having sidewalls (15), the tubular spacer member (31), comprising:
an endless wall (40) defining a plurality of lateral apertures (32,32' or 32'') therethrough, the wall (40) being alignable in abutting relation between the sidewalls (15) of the pair of tubs (14b,14c); and
means (42) for interlockingly coupling the spacer member (31) to the tubs (14b,14c).
11. The tubular spacer member (31) of claim 10, wherein said spacer member (31) had first and second ends (45,47) and said means (42) includes a plurality of projections (44) at the first end (45) and a plurality of recesses (49) defined in the second end (47).
13. The tubular spacer member (31) of claim 10, including:
baffle means (36' or 36'') for deflecting a gas inwardly through the apertures (32' or 32'').
14. A method of treating a plurality of parts (12) with a gas, comprising:
placing the parts (12) on an open frame work (20) within a pair of tubular tubs (14b,14c) open at both ends and having generally flow impervious sidewalls (15);
forming a column (16) by placing a tubular spacer member (31) in abutting relation between the tubs (14b and 14c);
directing the gas in a first flow path longitudinally through the column (16); and
controllably directing the gas inwardly into the column (16) through a plurality of lateral apertures (32,32' or 32'') in the tubular spacer member (31).
15. The method of claim 14, wherein the gas is a carburizing gas.
US06088722 1979-09-27 1979-09-27 Carburizing tub apparatus and method Expired - Lifetime US4272306A (en)
US06088722 US4272306A (en) 1979-09-27 1979-09-27 Carburizing tub apparatus and method
US4272306A true US4272306A (en) 1981-06-09
ID=22213067
US06088722 Expired - Lifetime US4272306A (en) 1979-09-27 1979-09-27 Carburizing tub apparatus and method
US (1) US4272306A (en)
EP0085136A2 (en) * 1982-02-01 1983-08-10 Allied Iron Company Processed ferrous metal and process of production
US4497671A (en) * 1982-02-01 1985-02-05 Wasserman Gary L Processed ferrous metal and process of production
US4815971A (en) * 1987-11-27 1989-03-28 Westinghouse Electric Corp. Multi-tier load fixture for a top-loading furnace furnace
US20120013056A1 (en) * 2009-01-14 2012-01-19 Robert Bosch Gmbh Charging frame and quenching device having a charging frame
US1915949A (en) * 1931-12-01 1933-06-27 Fredolf J Peterson Furnace
US2161162A (en) * 1938-01-06 1939-06-06 Leeds & Northrup Co Method of carburizing
US3642263A (en) * 1969-02-03 1972-02-15 Hayes Inc C I Workbasket for use in heat-treating furnace
DE2205579A1 (en) * 1972-02-07 1973-08-16 Rudolf Klefisch Integrally cast furnace boxes - having slotted walls
US4165868A (en) * 1977-11-25 1979-08-28 Allegheny Ludlum Industries, Inc. Method and apparatus for heating coils of strip
EP0085136A3 (en) * 1982-02-01 1984-03-21 Allied Iron Company Processed ferrous metal and process of production
US8900509B2 (en) * 2009-01-14 2014-12-02 Robert Bosch Gmbh Charging frame and quenching device having a charging frame
US5422081A (en) 1995-06-06 Trap device for vapor phase reaction apparatus
Foster et al. 1986 Contact in a'non-contact'society: The case of South Africa.
US2409295A (en) 1946-10-15 Porous metal article
Hayes 1993 Transracial adoption: Politics and ideology.
US6419753B1 (en) 2002-07-16 Apparatus and method for masking multiple turbine components
DE2629938A1 (en) 1978-01-05 Fuel element storage rack with neutron-absorbent plates - forming vertical sheath around each element held between end frames
EP0818555A1 (en) 1998-01-14 Method and equipment for vacuum carburization and products of carburization
JP2000336469A (en) 2000-12-05 Vacuum carburizing method and device
US1266912A (en) 1918-05-21 Cruller-cooking.
US3166663A (en) 1965-01-19 Microwave oven
US2504516A (en) 1950-04-18 Electrically heated oven
US6016819A (en) 2000-01-25 High turbulence multiple stage wire pickling system
Arons et al. 1961 Experimentally observed instability of a laminar Ekman flow in a rotating basin
Deschner et al. 1986 A treatment model for batterers.
GB2027062A (en) 1980-02-13 Continuous process for brazing and nitriding
US3693953A (en) 1972-09-26 Apparatus and method of forming a liquid curtain and thermal gradient control system
Lee et al. 1979 Spatial variation in void volume during charged particle bombardment—the effects of injected interstitials