Патент USA US2132110код для вставки
Oct. 4, 1938. ' H. HOLLER - 2,132,110 APPARATUS FOR- SURFACE HARDENING METAL ARTICLES Filed Dec. 1'7, 1935 r 2 Sheets-‘Sheet 1 91-34 ' v .15 3 .77 17 v N W4WI ll WU '1 i l x U 6" a , a1 . (@‘39' 6‘ 5 1 1 9?.3 y INVENTORZ MM,’ BY wall ?ake’ + l V ATTORNE )3 _ in,’ Oct. 4,1938. f ' H. HOLLER ~ .' 2,132,110 APPARATUS FOR SURFACE HARDENING METAL ARTICLES "Filed Dec. 17, 1935 l I ’ v2 Sheets-Sheet 2 , l VEN on: ’ -- f >' BY __ ‘ , Ar-aaé/liavzlj E Patentedoct. 4, 1938,- . ‘UNITED ' STATES PATENT ‘ omen ' 2,132,110 APPARATUS . . SURFACE METAL HARDENING ' ARTICLES Hermann' Holler, Frankfort-on-the-Main, Ger many,‘ assignor to I. G. Farbenindustrie Ak tiengesellschaft, Frankfort-on-the-Main, .Ger many . ‘ Application December 17,1935, Serial No. 54,923 ' In Germany December 29, 1934 2 Claims. The present invention relates to an appara tus for surface hardening metal articles. Surface hardening of metal articles by means of the blow pipe ?ame has been carried outby 5 means of apparatus by which the burner is posi tively driven in a suitable manner over the arti cle to be hardened. This method of hardening has also been carried out 'by apparatuswhich automatically applies the burner to the article 10 at the beginning of its movement and removes it when this movement is ?nished. For hardening numerous articles, however, it is necessary to move the burner'over the article at variable speeds, the speed in each case being 15 determined in accordance with the degree of hardness desired. Especially is- this done when hardening toothed wheels. In this application the burnermust, when placed overthe tooth to be hardened, remain in this position until the rela 20 tively cold tooth is heated sumciently. When this heating is ?nished the burner may be moved over the tooth ?ank but its velocity must be accel erated as it approaches the end of the tooth in order that overheating of this part of the toothed 25 wheel is avoided. ' ‘ When surface hardening bevel wheels, for ex ample, where the thickness of the tooth is not constant along its width, the requirements with regard to the burner speed are more difficult 30 to meet. An object of the present invention is to pro vide a device which permits the velocity of the burner to be adjusted to suit a particular article. 35 ' My invention is practiced by moving the burner over the article to be hardened while auto matically controlling its motion and driving it by operation of a driving member to which is imparted an always constant speed of rota 40 tion. ‘ The necessary adjustment of the velocity (Cl; 266-5) mechanism of the arrangement shown. inFigs. 1 ,to 3. e - . . ‘ ~ ' Referring to the drawings, a frame I carries a ‘carriage 2 vwhich can be. adjusted to a de siredv position on the frame and which supports the latter carriage anrarrn 4 is slidably mounted on rollers I5 in a guideway ‘i6 for reciprocating ' movement in- a direction transversely of the movement of the‘burner carriage‘ 3. The arm is held in the guideway l6 by guide-rails II. ‘The arm 4 isymoved by awheel 5 which is driven by va motor i3, as more distinctly shown in Fig. 4-, and which is ‘constrained by means of a solenoid I2 situated in a casing, to follow' the path ‘of 15 a ?xed cam plate 6, the shape of Whichis de termined according'to the particular require ments imposed by an ‘article to1be hardened. The wheel 5 is driven withaconstant velocity. When, for example, a normal toothed wheel shown in Figs. 1, and 2 is to be hardened the burneris, at the commencement‘ of the harden ing process, positioned adjacent the left top edge of a wheel tooth. The 'whee15 ‘at this moment is at the left rear corner ill of the cam platev 6. Wheel 5 now runs forwardly,‘ i.‘ e. towards the toothed wheel on the plate as indicated by an arrow in Fig. 2. As the arm 4 which carries the Wheel 5 is slidably arranged in the burner carriage 3, the burner, which is ?xed to its carriage, is not moved during the forward move ment of the wheel 5. As soon as the wheel 5 rounds the left front corner of the plate 6 it moves to the right as shown by the arrow in Fig. 2 at a constant velocity and thereby moves the burner to the right over the wheel tooth until the edge is reached. At the end of this movement the wheel 5 rounds the right front corner of the plate 6 and returns to its initial position by mov ing over the hypotenuse of the triangular cam of the moving burner is accomplished by posi tively changing the direction of movement of the driving member, and by transmitting the e?ect plate 6 in the direction indicated by the inclined of this change to the moving burner through a brought away from the action of the cam plate 6 in a manner more distinctly de?ned below 45 sliding arm between the driving member and the burner carriage. The invention is illustrated by way of example in the accompanying drawings in which Fig. 1 is an elevation, Fig. 2 a plan, and 50 Fig. 3 illustrates diagrammatically a bevel wheel to be hardened, while Fig. 3a. illustrates the cam plate used when hardening the bevel gear of Fig. 3, 55 Figs. 4 and 5 illustrate details of the drive a. for movements thereon a burner carriage 3. ‘ In arrow in Fig. 2. For this purpose the driving wheel 5 is, when the heating has been ?nished, and the burner carriage 3 is drawn back into its initial positionwith an elevated velocity by means of a weight ll. When, instead of a normal toothed wheel a bevel wheel, as shown in Fig. 3, is to be hardened, 50 a ?xed cam plate of the shape shown at m in Fig. 3a is used; In this case the speed of the burner as it moves along a tooth is not constant but varies according to the kind of toothed wheel as can be seen from the shape of_ the plate at m. 55, 2 9,189,110 . Otherwise the remaining features of the appara tus are the. same. As illustrated in Figs. 1 to 3, the toothed wheel to be hardened is placed on an axis .which'rests on two bearings. ' When the hardening process‘ is being carried out thevcarriage I which supports the burner‘ carriage'l ‘is clamped to the frame I' by any suit able known means. 7 ,7 ~ The contact of the wheel I with the surface of the ?xed'cam plate I as it moves on the latter can be secured by a magnetic device. The wheel 5 may. for example, vbe kept magnetized by a solenoid i2 situated above it and carried on the arm 4. The wheel will thus be constrained to .15 remain in. contact with the cam plate by magnetic attraction. A quick return movement'of the burner may be effected bylprovlding a second cam plate and arranging it to be traversed by an idle running 20 wheel which is driven by a weight.‘ ' a Figure 4 illustrates on an enlarged scale a side view of the rear part of the connecting arm 4 shown in Figure 2 on which the magnetized wheel 5 is situated, the solenoid i2 being mounted above the wheel 5 which is driven with constant veloc ity by means'of a motor II. A bent angle iron 9 carries thev cam plate I. Above the cam. plate 6 there is mounted a'further cam plate I which, in connection with the. idle running ‘wheel ‘I effects the quick return of the burner carriage I. As shown in Figures 4 and.5, the camplates O and I are fastened by a flat iron or an angle iron to the carriage 2 which is illustrated com-v pletely in Figures 1 and 2. I claim: 1. Apparatus for heating metal articles, par ticularly toothed wheels .by means of the blow pipe ?ame for the purposeiof subsequent harden ing, which comprises a burner carriage movable , parallel to the surface to be heated, an arm‘, 10 slidably mounted on the‘ carriage and movable; towards and from the article, a ?xed cam plate, and a‘ driving wheelcarried on the arm, means for rotating said driving wheel with a constant velocity, a magnetic device connected with the 15 wheel in such a manner as to constrain the driv ing ‘wheel to follow the cam contour, and thereby to move the burner vparallel to the surface to be heated at a velocity determined by the shape ' of the cam plate. . 2. Apparatus for heating metal articles, par 20 ticularly toothed wheels. by means of the blow pipe ?ame for the purpose of subsequent harden ing, which comprises a burner?c'arriage movable parallel to the surface to be heated; an arm 25 slldably mounted on the carriage and movable towards and from the'article, 'a‘ ?xed cam plate, and adriving wheel carried onthe arm, means for.‘ rotating said driving wheel with a: con stant velocity, va magnetic device connected with the wheel'in such a manner as to constrain the driving wheel to follow the ‘cam contour, and Figure 5 illustrates on an enlarged scale a plan view of the two cam platesl'a'nd I and the holding device 9.‘ The cam plate ‘In is formed in thereby to move the burner parallel to the sur such a manner that,-when the burnercarriage '3 face to be heated at a velocity determined by moves to the right, the idle‘ running wheel ‘I does the shape of‘said cam plate, a second fixed-cam not come. in contact with the cam plate 8. At platenan idle running wheel, also carried on said 35 the beginning of the return movement, vthe idle arm and adapted to follow the contour of said‘ ‘running wheel ‘I contacts against the cam plate second fixed cam plate for a portion of .the peri .8 and removes, thereby the magnet roll I from phery of the latter corresponding to the, return the cam plate 6. .By the action of the weight movement of the 'arm, whereby to move the II, the burner» carriage I now "returns into its driving wheel out offlxed relation with said ?rst 40 initial position with an accelerated velocity, the ?xed plate, during such return movement, idle running wheel 1 running along the inclined and a cam driving weight adapted to actuate said idle edge of the cam plate I. As soon as the wheel ‘I has reached the corner II, the magnet wheel I again comes into contact with the cam plate I and the further motion is now again performed by the driving motor i3. running wheelwhereby to move the latter along said portion of the periphery of said second ?xed cam plate providing a quick return motion of said arm. - HERMANN HOILER.