Патент USA US2403761код для вставки
July 9, 1946. - € ‘ A. E. SHORTER » I I 2,403,761‘ APPARATUS won HEAT TREATING INTERNAL SURFACES OF METAL ARTICLES Filed May 28, 1942 52 . _ _ INVENTOR ALBERT E. SHORTER BY. gATTORNEY Patented July 9, 17946" c v 2,403,761 UNITED j 1' ' v APPARATUS, 'FoRf' HEAT-inguinal INTER- ' METQL'ABI‘ICLES ‘ ' Albert EdwardgShlorter, Shei?eld,; England, ‘as-i »,: - -, signori to TheLinde Air Produetsrcompany, New- I' ,' York’.lilY-laserlm?fm #911392 f . Application May 28, l§:12~,iSerialNo.444,804 : ' v~.In‘Great.‘Britain June 4, 1941 ' *1 is I ' ' ' f4 ciaiai's'ficl.152F274) J" 1 This invention relates to apparatus for the_ heat -' inwardly into the burner head. Hi from the end surfaceremote from the quenching unit- [2; and communicating with the ‘distributing chamber treatment of internal'metal surfaces and e519?‘ cially to apparatus for the surface hardening of j such surfaces by theapplication .of high temper» ature heat followed by quenching. 2|, are a_.-plurality of :longitudinal gas passages , , 24-,symmetrically disposed with respect to the It is an object of this invention to'provide ap-_ paratus by which internal metal surfaces of .relg atively small diameter, such as‘ internal bearings, central v longitudinal; axis. > -.From each passage 24.; there extends a series- of the radial gas out lets vvI whichrareipreferably arranged with the outlets-of onerowstaggered with respect to those may be uniformly treated; to provide such appar, ratus by which all portions of. the internal sur? of an adjacent row. The rows of gas outlets H face may be heated simultaneously, and. a heat-; “preferably cover in the longitudinal direction a ing unit adequately cooled‘; to provide apparatus. distance slightly less than the length of the vbore for treating internal metal surfaces by which, to be treated, so that the terminal jets at each high temperature heating ?ames are directed; end do not impinge on-the edge of the bore but against such a surface and an auxiliary, combusT ‘ a short distance from the edge, thereby prevent- ‘ tion-supporting medium is supplied to such. ?ames; to provide such apparatus which includes, ' ingoverheating. ofthe edge which is heated'sub stantially .solelylbywconduction. To reduce the tendency to back?re, each longitudinal gas pas sage ,2-4, preferablytapers inwardly‘from. the open‘ a heat treating‘device which is accurately _'loc_at_-,-v ed and guided during theheat treating-opera tion; to provide forla relative rotationalv moves endas shown-in Fig.7‘ 2. The burner head H3 is ment between the heat treating_'devi'ce; andthe: work during such treatment‘, "andwto produce; preferablytmade of highly heat conductive metal - such as copper in'iorder that heat may readily be transmitted to the cold ?uid which is passed more uniform heating and quenching. Other ob jects'and the novel features-of this invention'will: through the conduit [4. become apparent from the following; description‘ and accompanying drawinghin which: . Fig. 1 is a sectional elevation of the preferred’. form of heat treating device. _ _ Fig. 2 is a transverse section taken along-the" line 2-2 of' Fig. 1. . ‘ . v ‘ ‘ vthe heat'treating device is primarily designed to operate, the-conditions for combustion may not be ideal and inorder to facilitate combustion, means. may be ‘provided for leading an auxiliary combustion-supporting medium to the combus 3.0:; Fig. 3 is a sectional elevation,villustrating_a modi?ed form of heat treating'device, in oper ative position with respect to a surfaceto ' In,viewv of the con?ned space within which‘ tion zone. This means may ‘consist of longitu dinally extending passages substantially entirely be . within the burner head, along which air as the The heat treating device D<comprisels, injcomlf ‘pass. by induction to the combustion zone. ‘As heat treated. bination, a burner head ‘l0 adaptedto be locat ed in juxtaposition with respectivto [the surface. and having longitudinal gas passages therein with'radial gas outlets H by which-hightemper auxiliary combustion-supporting medium may shown-in Fig; 2,'a' plurality of separate channels 26 may be provided in the burner head'terminat ing in;outlets orfori?ces;‘Zl'interspersed among ' the gas outlets, these separate channels 26 be ature heating ?ames may be applied to the sur_.- . 41); mg supplied with air or other oxidizing gas. For face, so as to heat the whole of the‘ surface si "this purpose, avpipe 28,'adaptedto be connected multaneously; a quenching unitfl2‘,'co-axialwith to an: auxiliary supply of combustion supporting the burner head and having. radial ?uidzldisg», gas such as air, extends through the chamber it charge outlets l3; and a conduit M forvthe sup- 7 from- the upper end thereof and divides into two ply of fluid to the'quenching unit, the conduit 45 ,tubes 2,91which lead to' channels 26 each vhaving extending through the burner head and acting 7'; a series of radial discharge outlets 21. as a thermal conductor to transfer‘heat from ,the _, burner head to the ?uid passing to. the. quench ’ ing unit, > Referring to Figs. 1 and 2, for details of the treating device D, the burner head H3 is ‘secured, as by welding or brazing, to a gas distributing chamber 2| having an inlet 22 adapted to be connected to a pipe 23 supplying gaseous fuel; such as an oxy-acetylene mixture. Extending 55 The. ?quenching unit l2¥comprises a chamber 30' closed at the end'remote fromithe- burner head H) by aremovable plug 3| ‘which permits ready access to the chamber 30 for cleaning purposes. A quenching medium, such as water, is supplied to chamber 30 from conduit I4, supplied by a tube or pipe 32 which extends through chamber 2! to the upper end of conduit M. In the wall of the chamber 30 are formed the radial outlets l3 2,403,701 4 3 for discharging the quenching medium. These outlets are preferably arranged in rows which extend over a distance at least equal to the'length of the bore to be treated so as to insure thorough quenching of the whole of the heated surface. In operation, the inlet pipe 23 is connected to l2, and by mounting the guide member 38 so that the aperture therein is also located centrally with respect to the burner head l0 and quenching unit II, the heat treating device may be ac curately mounted within the bore and guided during the movement from the heating to the a supply fuel of gas or suitable combustible mix quenching'portions. ture, the pipe 32 to a supply of cold ?uid, and The structural details of the heat treating de vice described above are given by way of example only and may obviously be modi?ed without de parting from the invention as de?nedin the ap the pipe 28 to a source of compressed air or other combustion-supporting gas. The heating jets _ ' T issuing from the burner ori?ces I l are lighted and pended claims. 7 the heat treating device thereupon inserted in ‘What is claimed is: the bore to be treated, the whole of the ‘bore l. A device for heat treating an internal sur being heated simultaneously. After a predeter mined time interval, su?icient for the surface of 15 face of a hollow metal article, comprising a burner head adapted to be inserted within the the bore to be raised above its critical tempera article and having a plurality of longitudinally ture, the heat treating device is moved longi extending rows of transversely extending outlets tudinally so as to withdraw the burner head Hi for directing high temperature heating ?ames from its operative position and simultaneously to move the quenching unit 12 into the bore to 20 against said surface; and passages terminating in longitudinallyextending rows of transversely quench the heated surface. '' extending outlets between adjacent pairs of said During the whole operation, the cooling ?uid outlet rows, for supplying an auxiliary combus supplied to conduit 14 passes through the heat tion supporting gas to said heating ?ames. ‘ treating device and when the burner ‘head Hl'is in operative position, the spraying of the ?uid 25 2. A device for heat treating an internal sur through the quenching ori?ces I3 serves solely face of a metal article, comprising a burner head adapted to be inserted within the article and to cool the ?uid which has become heated during having a plurality of annularly spaced longitudi its passage through the burner head 10 and which nally extending combustible gas passages therein may be collected and re-used. When the quench ing unit I2 is in operative position in the bore, 30 terminating in longitudinally extending rows of the burner jets are preferably extinguished so transversely extending outlets for directing high that the cooling ?uid reaches the quenching unit temperature heating ?ames against said surface; 12 very nearly at the supply temperature and and longitudinally extending passages substan therefore serves as a more e?‘lcient quenching tially entirely within the burner head between medium. I 85 adjacentv pairs of said combustible gas passages and opening laterally between said rows of out When a succession ‘of articles are ‘to be treated, lets for supplying an auxiliary combustion sup each having one or more bores to be ‘hardened, it is of advantage to mount the articles in turn porting gas to said heating ?ames. in a chuck or other rotatable supporting means 3. A device for ‘heat treating an internal sur and an apparatus for the heat treatment of a “ face of a metal article comprising a burner head bearing surface will now be described ‘by way of adapted to be inserted within the article and having a plurality of symmetrically disposed lon example with reference to Fig. 3. gitudinally extending combustible gas passages A bearing member 35 having a central bore or therein terminating in transversely disposed out bearing surface 36 to be hardened is mounted in a chuck, the jaws .31 only of which are shown. (5 lets for directing high temperatureheating ?ames The chuck is rotatable about the central longi against said surface; a plurality of symmetrically disposed longitudinally extending passages ‘sub tudinal axis of the bore and a heat treating de vice constructed as shown in Fig. 1 is mounted stantially entirely within the burner head each Within the bore. The details of the heat treat located between an adjacent pair of combustible ing device bear the same reference numerals as gas passages and opening between said rows of in Fig. 1 and require no further description. The outlets for supplying an auxiliary combustion supporting gas to said heating ?ames; and a cen tral longitudinal passage at least coextensive with chuck is rotated so that the surface 36 may ‘be uniformly heated by the heating ?ames emitted from the outlets H and when the surface has attained the critical temperature, the heat treat ing device is moved so as to withdraw the burner head ID from the bore and move :the quenching unit I2 into the position occupied previously by the burner head. - In order that the device may be speedily and accurately mounted within the bore suitable lo-' eating means may be provided. As shown in Fig. 3, the locating means may comprise a guide said rows of combustible gas outlets for the pas sage of cooling ?uid to cool said burner head. 4. A device for heat treating an internal sur face of a metal article, comprising a burner head adapted to be inserted within the article and having a plurality of symmetrically arranged lon gitudinally extending rows of transversely ex tending outlets for directing high temperature heating ?ames against said surface so as to heat substantially the whole of said surface simul taneously; and longitudinally extending passages ception of a guide pin '39 projecting from the 66 substantially entirely within theburner head be member 33 having a, central aperture for the re plug 3|’, which serves as a closure member for tween adjacent pairs of said rows on opposite the quenching chamber 30. The central longi tudinal axis of the guide pin 39 is coincident with that of the burner head I!) and quenching unit sides of said burner for supplying an auxiliary combustion supporting gas to said heating flames. ALBERT EDWARD SHORTER.