US2019937A - Method of casting bars - Google Patents

Description

Nov. 5, 1935.

E. M. STAPLES METHOD OF CASTING BARS zmmsia zes Filed Oct. 20, 1933 'NVENTOR.

ATTORNEY.

Patented Nov. 5, 1935 g 2,019,937

UNITED STATES PATENT. OFFICE METHOD OF CASTING BARS Evans M. Staples, Cincinnati, Ohio, assignor to Aluminum Industries, Inc., Cincinnati, Ohio, a corporation" of Ohio Application October 20, 1933, Serial No. 694,439 I 2 Claims. (c1. 22-490) This invention relates to a machine for, and a laterally. I5 is a toggle, the function of which method of casting long narrow objects. More is to hold the flask in place against a stripping specifically, it-relates to means and a method for plate It), in which an'opening I1 is presented preparing a sand mold for a casting operation by which is in alignment with the pattern i2. Alignforcing a pattern, in this instance made bar ment or slide bar I6 fits in a blind hole 18 in the 5 shaped, by way of example, into the packed moldstripping plate ID, by a driving fit so that the bar ing sand, and then withdrawing the bar or patand plate are practically integral. tern. The function of the alignment or slide bar It My Patent 1,979,581 of November 6, 1934, which is to guide the pattern and the pattern head oscil- 10 covers apparatus suitable for making molds prelating mechanism 20. 22 is the frame of the lat- 10 liminary to casting by the present method, has ter, this frame fitting about slide bar "and bebeen carved out of this application. ing slidable thereon.

Among the objects of the invention is the pro- The motivating force for pushing pattern l2 vision of both a machine and a method for castis derived from a horizontal hydraulic cylinder ing bars, especially in bronze and other alloys 9. This is of conventional desi n, 50 that its 15 or metals which cannot be conveniently worked, P p connections a t s own. Pattern l2 (but permissibly in other metals such a t l) is connected to the cylinder piston rod l2a (Fig.

Briefly stated, the method comprises forcing a 2) Which is shown as of lar er diameter. The

pattern into a flask of packed molding sand by alignment bar extends outwardly from the g0 hydraulic means and simultaneously opening the base of cylinder 9 pa a el to t pattern sand for the entrance of the pattern by vibrating While 20 is e Vibrating mechanism carried y h or oscillating a wedge or pointed shaped part on and the cylinder p on rod Mec anism the end f aid patter Th pattern i hydrau- 20 is slidable on the bar It so that the latter serves lically withdrawn afterthe mold cavity has been the double function of aligning e p ate "I d formed, the mold then tilted, and a pouring cup holding the Vibrating mechanism p t- Th 25 mounted on the front of the mold and the casting means by Which 1ihe Vibrating c a sm 20 can poured. be slid along bar I6 is a cylindrical bearing 2| Reference i now had t th accompanying carried in the frame 22 of the said mechanism. drawing in which: It will be observed that the frame 22 is carried Fig.1 is a side elevation of the molding machine along by piston but slidably mounted on 30 and sectionally of the flask containing sand, and alignment bar ii-- bef r closing th k, The pattern I2 is not solid but comprises an Fig. 2 is a side elevation of the same with the inner solid bar 32 which is ded by a tube flask top be clamped i place and t pattern 33. The latter at its outer extremity. has fltted 35 at the furthest extent of the stroke. into it a pointed id i a i d 3 having 35 Fig. 3 is a side elevation showing the pattern a cylindrical rear portion a w h s p v ded withdrawn and th lt t mold t on its inner end with a recess (not shown) to Fig. 4 is a longitudinal section of t flask it receive the outer end of bar 32. A cross hold a pouring cup added, the assembly being in tilt d 35 is provided in both of these for the reception position for pouring the casting. of a pin (not shown) to hold them together. At 40 Fig. 5 is a cross section of the molding machine the inner d bar I! right hand end on taken along the line 5 5 of Fig. 3, this view showsthe construction is similar. a ss is ing the arrangement of the bar vibrating means. P v in the n f the T head 30 to receive Fig. 6 is a plan view of that portion of th the end of the bar 32 and a hole 36 is provided 5 molding machine lying between the vertical arthrough bo f the reception of a p (not rows on Fig. 3. It shows in detail the vibrator shown) to hold them together. The holl w yl nand pattern construction. drical rear portion 34b is of a diameter adapted In the drawing, 4| is a flask containing moldto allow it to slide within thetube 33 up to the ing sand II, which is indicated by stippling. The limi t by the oulder 34a. The outer constructure shown to the right of the flask is for tour of tube 33 is that of the desired mold cavity, 50 the purpose of forcing the pattern l2, through consequently the said outer contour is not limited the sand while that on the left side is merely for to a cylindrical shape. holding the flask against the pressure created The vibrating mechanism itself comprises the by the pattern, l3 and I4 are strong uprights, l3 above mentioned frame 22, an electric motor 23 5 being anchored to the floor, while It is movable mounted above it, a pulley 24 on the motor, a

pulley" onthesideoftheframe,andabelt It transmitting power from the motor to the latter pulley.

Referringnowtol'is.5,pulley2liskeyedto an eccentric shaft 21 which is mounted in the frame 22 crosswise thereof. In the middle of this shaft are carried two connecting rods II and II which together form a clevis .in the arms of which the T head II of the oscillating head rod 82 is hung so that its cylindrical ends are free to oscillate in the extremities of the clevis. A pin :l is provided to 110m parts a and a together. These details are shown in Pig. 8.

Pattern head 34 is thus connected to the actuatingbarfl withinthepatternssoastohave a bearing within the latter when oscillated. In this way a bearing surface is provided which is fairly wellprotected against the entrance of sand particles. Actuating bar I! is in turn connected to the oscillatable T head by pin It and the head is in turn attached to connecting rods 28 and II by pin 3|. Pattern tube 33 is clamped-to a cylindrical extension 38 of the T head by means of a ring 31 welded to the outside of the tube. This ring also protects the edge of the tube 33 against splitting. Extension 38 is oscillatable within tube 33 which forms a bearing for said extension.

In operating the machine functions as follows and the casting steps occur in the following order: Flask ii is placed in position and toggle i5 is depressed, thereby holding the flask agairist the stripping plate I I and holding it rigidly. Flask 4| filled with sand and rammed lightly, after which the mold cover N is placed in position and clamped.

Electric motor 23 is now energized and the hydraulic pump (not shown) started. The hydraulic valve (not shown) is then opened to advance pattern I! and vibrating mechanism 20.

Rotation of eccentric shaft 21 by pulley 25 now imparts a back and forth vibratory motion to pattern head 34, assisting its e into the sand in box 4| by a hammer action. This action is brought about by the rotation of shaft 21 in members II and 7! of the clevis, which transmits the motion to the bar 32 and so to the pointed head 34.

apouringcupllisattachedtotheendofthe flask 4| from which stripping plate II has been 10 removed. Pouring is now done through gate 30.

Since the sand is highly compressed along the path of pattern If, it follows that bars of even diameter may be cast.

Not only bars, but other castings which are much longer than they are wide, can be made by this method. To do so, the bar I2 is replaced by a different shaped pattern of the shape that it is desired to reproduce.

Itistobeunderstoodthatmymachinecanbe made in the so-called "gang type, i. e. to ram several molds at once by having one hydraulic cylinder actuate several patterns which are attached to a header. Any competent mechanical engineer can, in view of this disclosure successfully design such a gang type machine.

I claim as my invention:

1. The method of reproducing long narrow objects which comprises forcing a pattern of the shape which it is desired to reproduce into a tightly packed sand mold thru a stripping plate while oscillating the head of the pattern along the axis of travel of said pattern, then withdrawing the pattern, gating the mold, tilting it and then pouring metal into the cavity formed by the pattern.

2. The method of casting bars which comprises forcing a bar shaped pattern into a lightly packed flask of molding sand thru a stripping plate while vibrating the head of the pattern along the axis of travel of the pattern, withdrawing the pattern, tilting the flask, attaching a pouring cup thereto in communication with the formed cavity .and then filling said cavity with molten metal while the flask is tilted at such an angle as to facilitate the inflow of metal.

EVANS M. STAPLES.

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