US1760555A - Press-casting machine - Google Patents

Description

May 27, 1930. c. J. HULT PR-ESS CASTING MACHINE Ma 27,1930. c. J, Hum 1,760,555

' PRESS CASTING MACHINE Filed April 23. 1928 2 Sheets-Sheet 2 (Zara M1 /N V N Tog out thereby performing any appreciable Patented May 27, 1936 'UNITETSTATES PATEd OFFICE CARL JonAii I-IU'L'I, or TUREBERG, SWEDEN PBESS-GASTING MACHINE Application filed April 23, 1928, Serial No. 272,291 and in Sweden March 29, 1926.

. The present'invention refers to press-cast ing machines, in which the ladle is raised out of the melting pot during each cycle of operation, and is adjusted so as to cause its nozzle to be directed towards a horizontal casting passage leading to. the mould and to be pressed against the mouth of said passage.

The invention has for its object to bring about an improved movement for the ladle in machines of the class referred to. The

invention primarily aims at providing positive guidance of the ladle in such a manner that the latter during its motion, in the more imity of the working position obtains a substantially horizontal path of movement withangularmovement so that the nozzle will he moved in properly adjusted position toward and removed from the mouth of the casting passage respectively.

The positive guiding meztns of the ladle 210- cording to the invention comprises a rear slot-guide permitting a horizontal parallel displacementof the ladle, and a suspension means for the ladle provided in front of the said slot-guide,=said suspension means consisting of arm which is upright in the worlc ing position of the ladle, and whichis adapthas .45 nace frame.

ed to be swung parallelly withlthe central plane of the machine, theladle being mountodon the free end of said arm.

Theinvention will'be described more closely with reference to the accompanying drawings which illustrate an, embodiment of the invention.

Figure 1 is a longitudinal section of the rear part of a casting machine having a motion mechanism arranged in accordance with the invention, a i

Figure 2 is aplan view of the same part of the machine. i

The melting-pot 1 rests on'a border 3 placed ontheupper sideflof the furnace frame 2. The lower edge of the'fixed mould holder 4, is supported onthe front part of the fur- V casting passage extends centrallythrough the said mould holder l,

whichnpassageis provided with a conical mouthTdopen-ing rearwardly. Inserted in a forwardly extending pipe on the ladle 7 mouth portion 9 adapted to fitinto the conical mouth f the castingpassage 5.

The ladle 7 is provided with two rearwardly projecting ears 10 having the fore end of a guide arm 11 secured thereto, the planed fore end of the guide arm tightly abutting against a corresponding plane hearing surface of the ladle, the ladle and the guide arm being inconsequence thereof mutually connected in a rigid manner by a bolt 12 threaded through the ears and the end of the arm. The rear part of the guide'arm is provided with a longitudinally extending guide-slot 18, and extending through this guide-slot is a shaft ll journalled in the frame, the diameter of which shaft is up proximately equal to the width of the guideslot. 1

Moreover, the guide arm 11 is rigidly connected with a suspension arm 15 projecting upwards from the fore end thereof, the upper free end of said suspension arm being provided with a hook 16, by means of which the ladle is suspended on a transversal rocking shaft 17 This latter is clamped at both ends by means of elastic forks 19 formed at the upper free ends of two swingable arms 18, each of said forks being provided with a clamping screw 20. The lower ends of the arms 18 are mounted between bearing cars 21 (Figure 2) projecting upwards from sleeves 22 which are threaded each on one of two fixed longitudinal bars 23. The fore ends of these bars are attached to the fixed mould holder 4, whereas their rear ends are connected with forked bearing holders 24 for the shaft 14:.

For the purpose of elfecting the shifting movement of the ladle, the shaft 14 has arms 25 keyedthereto on both sides of the guide arm 11, the free ends of said arms 25 being connected with the front part of the guide 1 the ladle is adjusted with the nozzle pressed against the mouth of the casting passage.

e positions assumed by the same parts when the ladle is submerged into the melting pot 1 for the purpose of being filled with molten metal, aretshown by dotted lines.

In the first-mentioned position (the working position) the centre lines of the guide arm 11, the link rods 26 and the arms 25 are contained in the same horizontal plane, whereby the ladle is effectively locked in the working position, a powerful tightening pressure being produced on proper ad ustment between the nozzle 9 and the mouth of the castin passage 5.

I hen the ladle is to be lowered, the hand lever 27 is swung upwards from the lowered position shown in Figure 2. The arms 25 are thereby swungup into the position shown by dotted lines in Figure 1, the guide arm and the ladle being thus pulled backwards by the link rods 26. At the same time the carrying arms 18 are swung rearwards about their pivots, whereby the ladle suspended on the shaft 17 is lowered, said lowering movement taking place first at a very slow and then at a quicker rate in connection with said rearward movement. In the beginningof the movement out of the working position the point of suspension will, on account of the vertical upright position of the suspension shafts, move right over the centre of the circular are forming the path ofthe suspension point, and thus the whole of the suspended system will first perform a parallel displaceinent rearwards so that the nozzle leaves the mouth of the casting passage in the axial direction without at this first moment pera well centered position toward the mouth of the casting passage. Such a centered and substantially rectilinear movement of the nozzle is particularly desirable in connection with the use of a conical nozzle, such a nozzle having been found to. permit of a more ac curate tightening effect than a nozzle having a spherical bearing surface. A conical nozzle also entails other practical advantages over the other type of nozzle.

The supply of compressed air to the ladle takes place through the medium of a valve 29 connected with an air supply pipe not shown on the drawings and arranged above the ladle, said valve 29 being carried by a lever 30 mounted on an arm 31 which is screwed fast to a bracket 32 projecting from the fixed mould holder 4. The valve 29 is pivotally suspended at the lever 30, and is guided by a sleeve 33 formed in the arm 3, the inner surface of said sleeve being conically flared in a downward direction, so that the axis of the valve may be rocked to some extent out of vertical position when the lever is depressed, for the purpose of effecting automatic adjustment of the valve toward the upper mouth of a neck-like air-intake 34 projecting upwardly from the upper part of the ladle. The valve 29 is provided with a valve spindle 35 adapted to 'be axially displaced against the action of a spring, the lower end of said valve spindle being provided with a spherically shaped bearing surface fitting to a corresponding bearing surface in the mouth of the air-intake 34. Furthermore, the valve contains automatically acting valve arrangements adapted to be actuated through the introduction of the valve spindle on the lever 30 bein depressed.

Arranged at the rear ends 0 the longitudinal bars 23 are adjusting means to control the distance of the ladle from the fixed mould holder 4 in the working position for the purpose of facilitatin the use of nozzles of different sizes and wit a View to adjust ing the bearing ressure between the nozzle and the mouth 0 the casting passage 5. The said adjusting means are made in connection with the attaching means for the rear ends of the bars 23 and consist of nuts 36 threaded onto the ends of the bars 23 and provided with rearwardly extending studs which are pivotally mounted in the middle portions of the bearing holders 24, at which they are re tained by hexagonal nuts 37. In effecting adjustment, the nuts 38, by which the bearings 24 are screwed fast to the frame, are loosened whereupon the bearings 24, the base plates 39 of which are provided with elongated screw holes, may be displaced in the desired direction by turning the nuts 36. p

In order to facilitate a corresponding adjustment of the holder of the valve 29, the arm 31 is adjustable with respect to the bracket 32.

Through the above described combination of a. slot-guide for the rearwardly directed guide arm 11 and the suspension of the ladle in an upwardly directed arm 18, a comparatively very level path of movement is obtained for the ladle, particularly so. if the V point of suspension is disposed at a relatively great height as in the embodiment shown. Such a level shape of the path of movement is exceedingly advantageous, first, as above mentioned, with respect to the desired centric and substantially rectilinear movement of the nozzle toward the casting passage, and, second, for the reason that the ladle can thus be freely moved, without it being necessary to shorten its spout in a non-desirable degree a to prevent the end of the spout from interfering with the fore edge of the melting pot.

I claim: 1. In a die-casting machine in combination a ladle having a bearing surface on the rear side thereof a rigid supporting member exa 55 ladle for the purpose of effecting locking.

tending substantially in horizontal direction,

a slot-guiding device provided atthe rear end 7 of said supporting member and permitting of horizontal parallel displacement of said member, shiftable suspending means carrying the fore end of the supporting member,

said member being formed at its fore end with a bearing surface adapted to abut tightly against the corresponding bearing surface on the rear side of the ladle, and means connecting the fore end of the supporting member with the rear side of the ladle, said con 1 necting means co-operating with said bearing surfaces so as to form a rigid joint.

2. In a die-casting machlne in combination a ladle, havlng a bearing surface and holes on the rear side thereof, a rigid supporting member extending substantially in horizontal direction and having a hole therein, a slotguiding device provided at the rear end of said supporting member and permitting of horizontal parallel displacement of said member, shiftable suspending means carrying the fore end of the supporting member,

said member being formed at its fore end with a bearing surface adapted to abut tightly against the corresponding bearing surface on the rear side of the ladle, and a bolt threaded through the hole in the fore end of the supporting member and through COII'G.

sponding holes in the rear portion of the ladle, said bolt co-operating with said bearing surfaces so as to form a rigid joint.

3. Arrangement according to claim 1,

wherein the rigid supporting member is V provided at its rear end with a guide slot a fixed guide pin threaded therethrough, and a swingable carrying arm for suspending said member at its fore end.

4c. In a die casting machine as claimed in claim 1, a swingable carrying arm, an upwardly projecting arm pivotally connected to r the upper end of the carrying arm and to which the forward end of the supporting member is rigidly connected.

5. In a die casting machine as claimed in claim 1, wherein an operating arm is provided and is swingable parallel with the central plane of the machine, link rods connecting the supporting member to the arm, and said operating arm being so arranged that this arm, the link rods and the supporting member will, in the working position of the ladle, be maintained in the same plane ex tending through the axis of the nozzle of'the In testimony whereof I affix my signature.

CARL JOHAN HULT.

Images