FR2740369A1 - Automatic device for cutting off feeders on castings - Google Patents

Abstract

The automatic device for cutting off feeders, comprises a fixed machine frame (2) and a table (3) for mounting a holding fixture (24) for castings, and at least one movable carriage (5) on table rails carrying a motor-driven circular saw (9), the table (3) being tiltable about a horizontal axis (26) by means of a drive, from a horizontal loading position to a sawing position inclined to the horizontal

Description

The invention relates to an automatic machine for cutting the

  weights. It is recalled that to facilitate the flow and distribution of a molten metal in a mold, it is known to equip the mold with upper or lateral housings intended to receive molten material increasing the hydrostatic pressure in certain parts. of the mold and favoring their good filling with the molten material. After cooling and demoulding, this excess material forms weights which must

be eliminated.

  In industrial foundries, this operation is carried out by means of automatic machines comprising a table supporting an assembly ensuring the clamping of the part and, at least, a sawing means, such as a band saw or moving mill saw,

  vertically, transversely or longitudinally with respect to the part.

  When the support face of the table is horizontal, the shavings produced by sawing are deposited, in part, on the table, which requires cleaning before installation.

  of each new part, and therefore increases the machine downtime.

  In addition, when the machine is equipped with a sawing unit moving longitudinally, and a sawing unit moving transversely, the block of material formed by the cutter or weights which falls first on the

  table, after being sawn, can be inconvenient for the second sawing operation.

  To remedy this, some machines include a table, the support face of which is inclined to facilitate the evacuation of the chips and unlocks the counterweight in

  direction of a conveyor arranged below the table.

  This solution facilitates the conditions of cleaning, sawing and positioning of the parts in the machining assembly, since the latter is less cluttered with shavings, but sometimes complicates the precise positioning of the part, in particular when that -this

  does not have a flat bearing face.

  In addition, to allow proper release of the block weights, this solution requires providing sufficient space between the path of the saw and the front protective panel of the machine. This has the effect of moving the machining assembly away from the protective panel and increasing the distance over which the operator must carry the blank, but also the finished part. As a result, the operator positions the blank by sometimes holding it at arm's length, that is to say in poor physical condition, which increases his fatigue and above all contributes to a

  more awkward and longer positioning than expected.

  The object of the present invention is to provide a cutting-off machine

  weights which overcomes these disadvantages.

  To this end, in the machine according to the invention, the table is articulated relative to the frame around a horizontal axis and is connected to motor means capable of rotating it, between, a loading position, in which it is horizontal, and a position of

  sawing, in which it is inclined relative to the horizontal, or vice versa.

  Thanks to this arrangement, the table can occupy a horizontal loading position facilitating the positioning of the blanks and a sawing position in which it is inclined relative to the horizontal plane, which facilitates the ejection of chips and blocks to weights. In other words, the machine according to the invention combines the advantages of machines with a horizontal table and machines with an inclined table, without

have the disadvantages.

  In one embodiment of the invention, the table is inclined around an axis

  horizontal transverse and the longitudinal edge of the table, near which the cutter circulates-

  saw is equipped with a chip collection chute and block weights, suitable, when the table is tilted around the transverse axis, to evacuate these elements on

  the upstream end of a lower conveyor.

  This arrangement makes it possible to reduce the distance between the table and the front panel of the machine compared to the machine comprising a plate inclined on the front, and, consequently, facilitates the work of positioning the blank on the clamping assembly while reducing staff fatigue. In addition, the chute makes it possible to ensure good evacuation of the shavings and the blocks with weights by avoiding any jamming of these between the table and the frame of the machine. In addition, the transport by the chute brings the chips and blocks directly to the inclined end of the conveyor, and makes it possible to avoid jams which occur at the change of trajectory, in the current installations comprising a conveyor having, under the table, a horizontal part, extended by a

  part tilted upwards, extending out of the table.

  Other characteristics and advantages will emerge from the description which follows in

  reference to the attached schematic drawing showing, by way of example, two forms

  of execution of the device according to the invention.

  Figure 1 is a plan view from above of a first embodiment in which the table is articulated around a lateral transverse axis, Figures 2 and 3 are front elevation views of the machine of Figure 1, when the table is respectively in loading position and in sawing position, Figure 4 is a side view in elevation of another embodiment of the

  machine in which the table is articulated around a longitudinal axis.

  This machine is composed of a frame 2 and a table 3 carrying, as shown in FIG. 2, longitudinal slides 4 for a movable carriage 5 and slides

  transverse 6 for a mobile carriage 7.

  The carriage 5 comprises a transverse sheath Sa for a carrying spindle 8

  of a milling cutter 9. This spindle is driven by a motor 10 carried by the sheath.

  As shown in Figure 2, the means ensuring the longitudinal movement of the carriage 5 comprises an electric motor 12, disposed under the table and driving a ball screw 13 cooperating with a ball nut 14 carried by a lug 15 projecting from the lower part of the carriage . The milling cutter 9 can thus move from a rest position, shown in FIG. 1, and in which it is protected by a casing 16, to a position, shown in phantom in 9a in FIG. 1. During these movements, in a direction or

  in the other, the milling cutter moves against the front longitudinal edge 3a of the table 3.

  The carriage 7 is movable transversely to the table 3 by an electric motor 17, linked to this table 3 and actuating a ball screw 18 cooperating with a nut

  balls, not shown, carried by this carriage.

  This carriage also carries an electric motor 19 driving by

  via a bevel gear 20, the spindle 22 of a saw mill 23.

  Finally, in known manner, the upper bearing face of the table 3 is arranged to receive various machining assemblies to fix a blank 25 to be cut. In the drawing, this machining assembly is shown diagrammatically by two flanges 24, but it can be in any other form known to those skilled in the art and not in the field of

the present invention.

  According to the invention, the table 3 is mounted with articulation around a horizontal axis.

  In the embodiment shown in Figures 1 to 3, this axis is materialized by a shaft 26, disposed laterally to the table 3 and transversely relative to the machine. This shaft, which is carried by bearings 27 integral with the frame 2, also pivots in bearings

  28, highlights below table 3.

  By its end which is opposite to that articulated around the shaft 26, the table 3 supports two longitudinal tabs 29 forming a yoke on which is articulated, by an axis 30, a plate 32 secured to the body of a pneumatic cylinder 33, arranged substantially vertically above the table. As shown in FIG. 2, the rod 34 of the jack is articulated by its lower end around a horizontal axis 36 carried by a yoke 37

of the frame.

  At rest, the table 3 is horizontal, as shown in FIG. 2, and therefore occupies a position allowing the loading on it of a raw part 25. After precise positioning of this part in the clamping assembly, the jack 33 is supplied in the direction of its extension, which has the effect of rotating the table 3 around the shaft 26 and bringing it into the sawing position shown in Figure 3. As soon as the table is in this position, the milling cutters 9 and 23, already driven in rotation, are displaced respectively, longitudinally and transversely, so as to cut, the first, the block of flyweights shown at 40 in FIG. 1, and the other the flyweight shown in broken lines and in 40a in the same figure. During this sawing operation and thanks to the inclination on the side of the table 3, the chips tend to descend by gravity to the right end of the table where it falls on the inclined lower end of a conveyor 43. The shavings produced by the milling cutter 9 fall, more specifically, into a chute 44 which is linked to the table 3 and is arranged near its front longitudinal edge 3a, but with sufficient space to allow the milling cutter to pass through. saw 9. This chute also makes it possible to receive the block 40a cut by the milling cutter 9, which makes it possible to prevent this block from jamming in the interval between the table 3 and the front panel 45 of the machine. By its inclination, the chute 44 leads this block 40a in the direction of the conveyor 43, without any

risk of jamming.

  It will also be noted that, thanks to the slope given to table 3, the sectioned block of weights 40a is automatically removed from the work surface and therefore does not risk

  interfere with the operation of the other saw blade 23.

  After cutting, the carriages 5 and 7 are returned to their starting position and the table 3 is returned to its loading position. As soon as it is horizontal, the clamping means 24 are released, so as to allow the evacuation of the part 25 and the establishment of a new part. This installation is carried out all the more easily as the table is cleared of all shavings, and blocks or weights and as the clamping assembly

is very close to the operator.

  The embodiment shown in Figure 4 differs from the previous one by the position of the hinge pin. Indeed, this axis consists of two shaft ends 50 which are coaxial, arranged longitudinally and project from each of the lateral ends of the table 3. One of these shaft ends is linked in rotation to a geared motor,

  the body, shown in dashed lines at 52 in FIG. 4, is fixed to the frame 2.

  Advantageously, the geometric axis of the shaft ends 50 is disposed substantially in the vertical plane P of the machine which contains the center of gravity of the table 3 and of all the equipment attached to it, namely the carriage 5, the carriage 7 and the clamping assembly 24. This arrangement makes it possible to reduce the torque necessary for

  cause the table to tip over.

  As in the previous embodiment, the table 3 oscillates between a loading position, in which it is horizontal, and a sawing position, in which it is inclined relative to the horizontal plane with an angle which can be either constant and defined by stops, either adjustable. The value of this angle depends on the

  distribution of equipment on table 3, but it is generally between 30 and 45.

  It is obvious that the invention is not limited to the embodiments which have been described above. Thus the shaft 26 which, in Figure 1, is arranged laterally to the table, can also be arranged in the central part thereof and that the actuator 33 can be replaced by a gearmotor pivoting the plate , or by any other equivalent means. Likewise, in the embodiment of FIG. 4, where the pivoting takes place around a longitudinal axis, the pivoting shaft can also be arranged near one of the longitudinal edges of the table 3 and the pivoting movement can be

  caused by a gearmotor, by a jack or by any other equivalent means.

  Finally, the invention also encompasses automatic cutting-off machines comprising a second transverse carriage carrying another saw milling cutter for cutting overhangs from the left part of the part 25 shown in FIG. 1. Whatever its embodiment, the machine according to the invention makes it possible to facilitate the evacuation of the shavings and the cut-out weights, but also to facilitate the

  positioning of the part by placing the platform horizontally in the loading position.

Claims (7)

  1. Automatic machine for cutting the weights comprising a fixed frame (2) and a table (3) capable of receiving a clamping assembly (24) of the blank (25), at least one carriage (5) movable on slides of the table, carrying a motorized sawmill (9), characterized in that the table (3) is articulated relative to the frame (2) about a horizontal axis (26, 50) and is connected to motor means (33, 52) able to rotate it between a loading position, in which it is horizontal, and a position   sawing, in which it is inclined relative to the horizontal, or vice versa.   2. Machine according to claim 1, characterized in that the table (3) is   inclined around a transverse axis (26).   3. Machine according to all of claims 1 and 2, characterized in that the   longitudinal edge (3a) of the table (3), near which the saw mill (9) circulates, is equipped with a chute (44) for collecting shavings and weights, suitable when the table is tilted around '' a transverse axis, to evacuate these elements on the upstream end of a lower conveyor (43).   4. Machine according to claim 1, characterized in that the table (3) is   inclined around a longitudinal horizontal axis (50).   5. Machine according to any one of claims 1 to 4, characterized in that   that the drive means are constituted by a jack whose body (33) is articulated relative to the table (3) and whose end of the rod (34) is articulated in a fixed yoke (37) of the frame (2).   6. Machine according to any one of claims 1 to 4, characterized in that   that the drive means are constituted by a geared motor (52) linked in rotation to a shaft (50) integral with the table (3), and mounted in rotation relative to the frame (2), the longitudinal axis   of this shaft constituting the axis of rotation of the table.   7. Machine according to any one of claims 1 to 6, characterized in that   that the geometric axis of rotation of the table (3) is disposed substantially in the plane   vertical (P) containing the center of gravity of the table with its equipment (5,7,24).