Dec. l0, 19416. A_ |_, HARTLEY 2,412,333 FLAME HARDENING APPARATUS Filed Nov. 27, 1942 6 Sheets-Sheet 2 INVENTOR. ALBERT LAARTLET BY ATTORNEY. OGGI bH “UL-'11 Dec. l0, 1946. A. L. HARTLEY 2,412,333 FLAME HARDENING APPARATUS Filed Nov. 27, 1942 EWExfß,...E ÉQQÉMÍ.on 6 Sheets-Sheet 4 -nol'cervf MI E INVI NTOR. ALBERT L. HAR'TLET ATTORNEY. 25D. MLIHLLUHJ ‘J A . fr.. l rmfnuo. Mumbai 4 Dec. 10, 1946. A_ |_„ HARTLEY 2,412,333 FLAME HARDENING APPARATUS Filed Nov. 27, 1942 6 Sheets-Sheet 5 INVENTOR. ALBERT L. HARTLET BY LMQ-»A’ÄM ATTORNEY. HUUH Dec. 10, 1946. A. |_. HARTLEY - 2,412,333 FLAME HARDENING APPARATUS Filed Nov. 2"?, 1942 e sheets-sheet e INVENTOR. ALBERT LAARTLEX BY ATTORNEY. 2,412,333` Patented Dec. 10, 1946 UNITED STATES PATENT OFFICE 2,412,333 FLAME HARDENING APPARATUS Albert L. Hartley, Cincinnati, Ohio, assignor to The R. K. Le Blond Machine Tool Company, Cincinnati, Ohio, a corporation ol' Delaware Application November 27, 1942, Serial No. 467,119 5 Claims. (Cl. 266--4) 1 2 This invention pertains to flame hardening ap paratus and is particularly related to such appa ratus adapted to the flame hardening of rela tively long small diameter holes in work pieces. 'I'his invention is specifically adapted to such types of Work as hardening the tapered bores in flame hardening apparatus shown on the line III-_III in Figure I. Figure IV is a plan view of the flame hardening burner having a relatively long tapered extension portion for entrance into the bore of the work piece to be flame hardened. Figure V is an end elevation of the flame hard ening burner of Figure IV particularly showing the fluted portion to permit escape of the burned gases during the heating process and which also spindles for lathes or the like. In flame hardening a relatively long small di ameter bore in a work piece certain specific prob lems come about which are not present when exterior surfaces of work are to be flame hard ened. One of the most difficult problems involved in the hardening of a hole in a Work piece of this character is that of applying a suitable flame hardening torch in the bore so as to uniformly and rapidl he n internal - -- _n . while at the same time proymìgingnsuitable dis chd‘f'gî'îäïmays in tñë‘torgh _tg_gereinigttfree esca‘lñ'cTf'-t-.'l'i'ë"lî?iiriied"gase“‘”"`M ' heat serves to provide access for the coolant nozzle when presented to the bore upon withdrawal of the flame hardening torch or burner of Figure IV. Figure VI shows a side elevation of the burner of Figure IV. Figure VII is a plan View of the coolant nozzle associated with the flame hardening burner which is inserted into the bore of the work piece being flame hardened while at the same time the burner ingcpïöcìì‘s‘raffït en the difficult problem of 20 is removed therefrom, so that coolant may be thoroughly distributed in the bore of the work piece without the formation of steam pockets or eddy currents which might otherwise be the case ening torch has brought the surface to the proper when cooling is undertaken in the presence of the temperature for quenching. This again necessi tates the peculiar handling of the ñame harden 25 flame hardening burner. Figure VIII is an end view of the coolant nozzle ing apparatus in that the flame hardening torch showing its association with the flame hardening must be rapidly withdrawn from the bore of the applying the quenching coolant to the work sur face substantially instantly after the flame hard work piece andthe coolant discharging nozzle burner. Figure IX is a side elevation of the coolant promptly inserted therein and’coolartkapplied 30 nozzle of Figure VII. tßlllgdieatedsurfacasdaìto @Seminarraum Further features and advantages of this inven tion will appear from the detailed description of the drawings in which: Figure X shows the relationship of the exterior flame hardening torches for simultaneously flame hardening the outside tapered portion of the work spindle While the bore is being flame hardened. Figure XI is a view shown on the line XI-XI of Figure I, of the flame hardening torches sur rounding the cylindrical portion of the work spin dle for hardening the back portion of the clamp ing flange of the work spindle simultaneously 40 with the hardening of the bore and exterior ta pered surface thereof. Figure I is a side elevational View of the bore flame hardening apparatus shown applied to a typical lathe spindle shown in fragmentary sec flame hardening torches applied to flame harden ing the rear portion of the clamping flange of quenchin l u ¢ . . - . ' .. l 'çwhgrgmlnmthgymrk 'A' All of these operations must be undertaken in a coordinated and accurately controlled manner so as to permit the proper functioning of the flame hardening process in the bore of the Work piece. Figure XII is a side view of one of the arcuate tion together with additional flame hardening 45 the spindle. torches applied to completely finish flame hard Figure XIII is a section thru one of the flame ening the outside diameter at the same time the bore is being hardened. Figure II is a transverse vertical section on the line II-II of Figure I particularly showing the roller reciprocating slide and actuating air cyl lnder for alternately presenting the flame hard ening torch or the coolant nozzle to the bore to be flame hardened. Figure III is a front elevational view of the hardening burners of Figure XI on the line XIII-XIII of said figure. For exemplary purposes this invention is shown applied to a typical lathe spindle W having the usual relatively long small diameter taper bore I which is to be flame hardened so as to prevent damage and scoring of this bore with the inser tion or withdrawal of Various lathe fixtures such 55 as the centers, collets, etc. The apparatus com 2,412,333 3 4 prises a main body portion 2 which is suitably ing mounted on it the mounting flange portions mounted to a fixed frame 3 of a flame hardening 38 and 39 of the coolant cylinder. In this par' ticular arrangement this coolant nozzle comprises a series of three parallel water tubes 40, 4I, and 42, which respectively lie parallel to and in the machine (not shown) by appropriate bolts 4. In this frame 2 is slidably mounted a pair of re ciprocating carriages 5 and 6 having rollers 1 op erating in appropriate slots 8 formed in the frame 2. On the upper carriage 5 is fixed a bracket 9 to which is appropriately ñxed a piston rod I0 of a reciprocating gear cylinder Il appropriately mounted on the surface l2 of the frame 2 by bolts I3 so that reciprocation of the piston rod III through the medium of its piston (not shown) in the cylinder II eiîects sliding reciprocation movement of the carriage 5 back and forth with its rollers 1 operating in the slots 8 in the frame 2. The lower carriage 6 is likewise reciprocated by respective fluted portions 33, 34, and 35 of the flame hardening burner 23 as best seen in Fig ures III and VIII. These tubes are connected by appropriate portions 43, to a manifold portion 39 having the-input passageway 44 by which quenching fluid may be applied to the tubes 40, 4I, and 42 which outlets 45 permit the fluid to spray rapidly and without eddy currents or steam pockets being formed upon the work surface hav ing been previously heated by the burner 23. Thus, referring to Figure I, the operation of this apparatus comprises ñrst presenting the through the medium of a pinion I4 carried on burner 23 as shown in Figure I, igniting the oxy acetylene mixture coming in through the mixing an appropriate stud I5 and which engages a rack I6 on the carriage 5 and a rack I1 on the 20 arrangement and torches 22 and through the fit carriage 6 so that when the carriage 5 is moved tings 24 into the burner 2.3 and continuing the to the right, for example, in Figure I the car heating of the bore I of the work spindle W until riage 6 will similarly be moved to the left in this it has arrived at its flame hardening tempera figure. Gear I4 carried on the shaft I5 may be ture. Immediately upon arriving at this critical withdrawn from operative position with the racks 25 temperature the air cylinder and its piston rod the cylinder in opposite reciprocatory motion I8 are operated to substantially instantly with I6 and I1 or for re-engaging them in diiïerent relative positions to effect different relative po draw the burner 23 telescopically past the cool sitioning of carriage 5 with carriage 6, by means ant nozzle comprising the tubes 40, 4I, and 42 of the operating knob I8, Figure II, which is which movement, through the medium of the connected to this shaft I5 and which may move 30 gear I4 and associated racks I8 and I1, causes it axially to the right to disengage the gear I4 the nozzle to be immediately inserted into the from the racks I6 and I1. Appropriate detent bore upon full withdrawal of the flame harden ing burner 23. Coolant is then instantly turned means I8 serves to position the shaft I5 either on through this nozzle to quench the bore of the with gear I4 engaged with the racks I6 and I1 or disengaged therefrom. In the latter case this 35 Work piece to flame harden the work in a. com pletely automatic cycle. In this way the escap ing gases, during the heating operation may be passed through the iluted portions 33, 34, and 35 of the ñame hardening burner 23 and these areas operations. On a bracket 20 ñxed to the cariage 5 by ap 40 may also be utilized to permit quick entrance of is desirable when it is not necessary to opposite ly reciprocate the carriagel 5 with respect to the carriage 6 as in other types of flame hardening the coolant nozzle into the bore upon Withdrawal ening torches 22 of conventional design to which of the flame hardening burner 23 so that the is connected the special llame hardening burner coolant may be thoroughly distributed in the bore of the Work piece to quench it without in 23 through suitable connections 24. This burner 23 is best shown in Figures IV, V, and VI and 4. terference and the creation of eddy currents or comprises a connecting portion 23a having the steam pockets which would otherwise occur where the flame hardening burner remains in position input line 25 through which enters the mixture in the bore during the quenching operation. It of oxygen and acetylene which is conducted through the passageways 25 and 21 to the jet is to be further understood, of course, that dur openings 28 as best shown in Figure V. Cool 50 ing both the heating and the quenching opera tions the Work piece W is rotated at an appro ant watel` enters the portion 23a of the burner 23 priate speed to effect the proper flame hardening through a passageway 28 and through the pas sageways 38 and 3| and discharging out the pas of the bore I. sageway 32 outside the bore of the workpiece It is to be -further noted that additional llame being hardened. This coolant traversing these 55 hardening burners 46 may also be carried on an appropriate bracket 41 fixed to the frame 2 to passageways is for the purpose of keeping the effect the flame hardening of the outer tapered tapered portion 23h of the flame hardening burn-surface 48 of the spindle W at the same time er 23 properly cooled during the operation. This the bore portion is being hardened if such an coolant, however, is not used for quenching the work surface after it has been brought up to 60 arrangement be desired. In this instance four flame hardening temperature. The ñuted design such torches 46 would be utilized as shown in propriate screws 2l are mounted the flame hard of this burner comprises the grooved portions 33, Figure X, each with appropriate mixer tubes 43 34, and 35 which serve the dual function of first connected to torches similar to that of the torch permitting free escape of the burned gases issu 22. In this case, however, since- it is an external ing from the jet openings 28 and also serve as ac 65 surface, the quenching water is caused to play upon the work from appropriate outlet jets 50 cess openings by which the coolant- nozzle ar after the flame hardening surface has been com rangement of Figures VII, VDI, _and IX may be pleted by the jets 5I in the conventional fashion readily entered into the bore of the work piece for such type of ñamehardening operation. while at the same time permitting rapid with As may be also noted appropriate burners 52 drawal of the llame hardening burner from the 70 bore after the Work piece has been brought to the as shown in Figures XI, XII, and )GII may be proper flame hardening temperature. utilized to effect the hardening of the rear ñange portion 53 of the work spindle W also carried on This coolant nozzle arrangement is mounted on simultaneously with both the hardening of the the lower carriage 6 by means of a bracket 36 connected to it by appropriate screws 31 and hav 75 bore and of the tapered portion 48 of the work UWI UH 4 2,412,883 5 spindle. This arrangement of the burners 52 are formed arcuately so their coniiguration ñts around the work spindle W and the coolant water is applied after the work has been heated to flame hardening temperature by the torches through the medium of water jets in the torch mounted on a slide for movement into a bore to be flame hardened in a work piece, a quenching coolant nozzle mounted on another slide for presentation into said bore, common rack and pinion actuating means for oppositely recipro cating said slides, longitudinally extending grooves formed in said burner to facilitate dis posal of burned gases during the operation of said burner and to at the same time provide or any other outside means for applying this cool ant to the surface `‘53 after it has been appropri ately heated. Having thus fully set forth and described my 10 passageways for the insertion of said nozzle in said bore during the presence of said burner therein, and means for disengaging said common Ñcure by United States Letters Patent is: rack and pinion driving means to allow inde #A 1. InV _aw ñame hardeninngwapp‘a‘gatuus, a longi pendent movement of said slides. j'ectableántoma'mbore to bemiiamgwhlarfd vl~\`dmimr‘_1_~a 15 4. In a llame hardening apparatus, a main body portion, a pair of slides mounted on said body portion, a iiame hardening burner mount tudinally arrang'ëdïöîìí?ësentatiouintosaidhqge invention what I claim as new and desire to se "if am,_.çgclaat..nczzle.lgng"ï Oisal sa coo ed on one of said slides, a quenching coolant noz pieœï'ñfayalélè„maintiaamsansior said'bïi?ñerî"and"iiiövable mounting means for "'“rîöz‘zl'ëïmand common means for re zle mounted on the other of said slides, disen 20 gageable rack and pinion means for simultane ously oppositely reciprocating said slides or to ciprocating said respective mounting means so allow independent movement of said slides, pas as to alternately insert said burner or said nozzle sageways formed on said burner to allow escape into the bore of said work piece, said burner and of burned gases during the operation of said nozzle being telescopically inter-related so that burner in the bore of said work piece, said pas 25 said coolant nozzle may be inserted into said sageways being arranged to allow said coolant bore of said work piece while said burner is be nozzle to be disposed circumferentially about ing removed therefrom, said telescopic associa said burner within the confines of the bore of tion of said burner and nozzle comprising longi said work piece so that said burner and nozzle tudinally extending pasasgeways in said burner ‘may be alternately or simultaneously inserted in serving to provide escape for the burned gases 30 said bore by axial movement of said burner and when said burner is in operation in said bore and nozzle by said slides. further serving to permit said cdolaniì nozzlmtn 5. In a ñame hardening apparatus, the com ` nto the bore of said workugiece whmihle bination of a main body portion, a pair of slides said nozzle is being withdrainxfrt‘lì'e‘iíëìrhm.u 35 reciprocatably mounted on said body portion, rack ~~~wzrríïme~harceñîíg apparatus for hard ening an elongated small diameter bore in a work piece, an elongated flame hardening burn er, an elongated coolant nozzle, a pair of 0p positely reciprocatable slides for alternately or simultaneously presenting said burner and nozzle in the bore of said work piece, rack and pinion means for reciprocating said slides, means for disengaging said rack and pinion means for in dependent movement of said slides, and longitu dinally extending passageways formed on the exterior of said burner for the escape of burned gases during the operation of said burner in said bore and to allow simultaneous insertion of said nozzle and burner in said bore. 50 3. In a iiame hardening apparatus, a longi tudinally extending flame hardening burner and pinion means for oppositely reciprocating said slides, means for disconnecting said rack and pinion mechanism for independent move ment of said slides, a flame hardening burner mounted on one of said slides, a quenching cool ant nozzle mounted on the other of said slides, in telescopic relationship with said burner, and passageways formed in said burner extending longitudinally thereof and axially of the bore to be flame hardened in the work piece, said pas sageways serving to both facilitate disposal of burned gases during the operation of said burner and to allow the simultaneous or independent in sertion of said burner and nozzle in said bore of the Work piece. ALBERT L. HARTLEY.