Rollover closer

A system for automatically assembling flaskless copes and drags, preparing them for metal pouring on an indexing conveyor belt. A cope is centered on the conveyor, lifted, and rotated 180.degree.. Thereafter, a drag is centered beneath the cope, and the cope is lowered onto the drag, to form a complete mold, ready for metal pouring. All of the above is accomplished automatically, with little or no supervision required.

BACKGROUND OF THE INVENTION 
The method of forming flaskless molds automatically has been practiced for 
some time. The economic advantages have long been recognized. Most systems 
in existence today have some shortcomings, however, with either the 
quality of the finished mold being poor, these systems being too 
complicated, or the production rate being too low. 
SUMMARY OF THE INVENTION 
The flaskless molding line of the present invention can produce high 
quality finished, assembled molds, at speeds of up to 100 per hour on an 
indexing conveyor belt. By means of the rollover closer machine of the 
invention, the copes and drags are accurately aligned and assembled, so 
they are ready to be poured.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Looking now to FIG. 1, numeral 15 designates an indexing turntable having 
twelve stations, numbered 1-12 respectively. An indexing motor rotates the 
table 30.degree., for example every 18 seconds. At stations 1 and 2, an 
operator can remove and replace the flasks with ones of differently 
configured patterns or sizes, if such is desired. The cope and drag flasks 
are alternated, with every other one being a cope flask 14 with a drag 
flask 16 located therebetween. All of the flasks have an integral pattern 
secured in the bottom thereof. At station 3, the flasks are filled with 
chemically bonded sand, in any of several well-known manners. From 
stations 4 through 11, the sand is allowed to set up or harden. Thus, with 
a turntable that indexes every 18 seconds, approximately two and one-half 
minutes are allowed for the sand to cure. At station 12, the flask, 
containing either a cope or drag therein, is removed from the turntable by 
means of the rollover draw machine 20. The flasks, in being indexed about 
the turntable 15, are carried on a pair of tines 22, which are supported 
by and extend from the central hub or table 25. The rollover draw machine 
is described in greater detail in my copending patent application filed on 
even date herewith, Ser. No. 898,587, now U.S. Pat. No. 4,172,488 issued 
Oct. 30, 1979 and entitled "Flaskless Molding Line for Chemically Bonded 
Sand Molds." 
The rollover draw machine 20 has a pair of arms 24 and 26 rotatable about 
axis 28 that picks the mold halves up, and rolls them over, shakes them 
out of their flasks, and deposits them on the indexing conveyor belt 42 
with the parting line or pattern side up. The conveyor belt 42 is indexed 
to coincide in movement with the turntable; i.e. it moves forward a given 
distance every 18 seconds. At stations 32 and 34 the mold halves can be 
washed, inspected, and cores set in the drags. 
Looking now to FIGS. 2-4, the rollover closer machine is shown in more 
detail. Numeral 40 designates the rollover closer machine in its entirety. 
To start the operation, the conveyor belt 42 will move a cope 44 into the 
area of the rollover closer. The belt then stops. The blocks 46 and 48 are 
actuated inwardly towards the cope by a hydraulic rotary motor 50 (FIG. 
3). Links 43 and 45 are rigidly attached to the output shaft of motor 50, 
and links 47 and 49 are pivotally connected to the links 43 and 45. Thus, 
clockwise movement of motor 50 moves blocks 46 and 48 inwardly, and 
counter-clockwise movement moves them outwardly. The blocks 46 and 48 
slide along rods 52 and 54 respectively, to make the pads 56 and 58 come 
into contact with the sides of the cope 44. If the cope comes into the 
rollover closer machine somewhat off-center from side-to-side, this 
operation will center it. 
Looking now to FIG. 2, it can be seen that the blocks 46 and 48 each carry 
a hyraulic rotary motor 60 and 62. These rotary motors are actuated at the 
end of the side-to-side centering operation. Each motor actuates a pair of 
longitudinal centering pads 64, 66, and 68, 70 respectively. Pads 68 and 
70 are carried on arms 80, 82, respectively. Pads 64 and 66 are carried by 
similar arms. Thus, the cope is centered or positioned longitudinally by 
these members. Rotary motor 50 is again actuated and the cope is clamped 
and held in centered position. At this point in time, a piston-cylinder 72 
(FIGS. 3 & 4) moves downwardly, bringing gripping pads 74 and 76 into 
operative position. Rotary motor 78 then moves the gripping pads 74 and 76 
inwardly, with arms 73 and 75 sliding on rods 84 and 86, until the pads 74 
and 76 contact and tightly grip the cope 44. All of the centering pads are 
then operated in the reverse direction, away from the cope. 
The piston-cylinder 72 then is reversed, lifting the cope 44 up off the 
conveyor belt. At this point in time, motors 88 and 90 are actuated, 
rotating the cope 44 180.degree., so as to bring the parting line or 
pattern side facing down. All of the above takes place in one indexing 
period of 18 seconds. The conveyor belt is then again actuated or indexed, 
bringing a drag 92 (FIG. 8) into the rollover closer station. The rotary 
motor 50 is again actuated, centering the drag from side-to-side. Once it 
is centered, the motor backs off slightly, so that the drag is not tightly 
held, which is true also of the cop during its handling. Rotary motors 60 
and 62 are then actuated, centering the drag longitudinally. Rotary motor 
50 is again actuated and the drag is clamped and held in centered 
position. Piston-cylinder 72 then lowers the cope 44, which is positioned 
directly above the drag, until it seats on the drag. Rotary motor 78 is 
actuated to back off pads 74 and 76 to release the cope mold. The 
piston-cylinder 72 then withdraws upwardly, and the gripping pads 56, 58, 
64, 66, 68 and 70 are retracted. This ends another indexing period, and 
the machine is ready to start over, receiving another cope. A completed 
mold is now about to leave the rollover closer station 40, ready in every 
respect to be poured at a later station. 
FIGS. 5-10 show the various successive stages accomplished at the rollover 
closer station. First the cope 44 is centered from side-toside, and 
longitudinally (FIG. 5). Since the mold halves are centered about a center 
point, and not from a corner on the mold half, the unit is capable of 
handling molds of different sized without making any changes in the 
controls. The unit next brings gripping pads 74 and 76 into position for 
gripping the cope 44 (FIG. 6), lifting it (FIG. 7) and rotating it 
180.degree., while the belt advances, bringing a drag 92 into place 
beneath the cope (FIG. 8). 
The drag 92 is then centered, both side-to-side and longitudinally (FIG. 
9). The cope 44 is then lowered onto the drage 92 (FIG. 10) to finish the 
operation, forming a completed mold for pouring at a later station. The 
assembled mold then is transferred onto the conveyor 100 and molten metal 
is poured from pouring ladle 102 to form the casting.