Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
  • B22D29/001—Removing cores
  • B22D29/005—Removing cores by vibrating or hammering
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
  • B22D29/001—Removing cores

Definitions

• the present invention relates to a decoring machine.
• the present invention relates to a decoring machine for removing residual moulding material from foundry castings, the machine being of the type comprising a frame defining a housing for at least one casting to be decored; and two unbalanced motors or electric vibrators fitted to the frame to rotate, in use, about respective vertical axes of rotation and impart to the frame a vibratory movement, which may be straight or an oscillating movement about an axis, depending on whether the unbalanced motors rotate in opposite directions or the same direction.
• the frame is invariably massive, heavy, and normally oversized.
• Figure 1 shows a view in perspective of a preferred embodiment of the decoring machine according to the present invention
• Figures 2 and 3 show side and end views respectively of the Figure 1 machine
• Figure 4 shows a plan view of the Figure 1 machine
• Figure 5 shows a larger-scale view in perspective of a detail of the Figure 1 machine.
• Number 1 in Figure 1 indicates as a whole a decoring machine for removing residual moulding materials from foundry castings 2 by subjecting castings
• This type of machine is used to advantage, for example, for decoring aluminium alloy cast engine cylinder heads.
• Machine 1 comprises an upward-facing, fork-shaped supporting frame 3 defining a housing 4 for castings 2 to be decored.
• machine 1 is set to simultaneously decore two castings 2 arranged side by side in housing 4, but may obviously also be used to decore one casting 2 at a time, or more than two castings 2 simultaneously, depending on the size of castings 2.
• Frame 3 rests on a base block 5 with the interposition of four elastic bearings 6, which are fitted to respective uprights 7 integral with a horizontal portion 8 of base block 5, are in the form of convex cylinders coaxial with respective parallel vertical axes, and flex elastically in a direction crosswise to their respective axes.
• This system reduces the force resisting vibration, and at the same time reduces downtime of machine 1.
• frame 3 comprises two U-shaped metal plates 9 located on opposite sides of and parallel to a vertical plane of symmetry A of frame 3, and each defined by a substantially rectangular bottom portion 10, and by two upright portions 11 extending upwards from respective opposite lateral portions of the free top edge of bottom portion 10.
• the two bottom portions 10 are connected rigidly to each other by a number of tubes 12 perpendicular to plane A, so as to define as a whole a rigid base member 13 of frame 3.
• each plate 9 The upright portions 11 of each plate 9 are connected to the upright portions 11 on the opposite side of plane A by bars 14, so as to define two shoulders 15, which define housing 4 laterally, and are located on opposite sides of a vertical plane of symmetry B perpendicular to plane A.
• Each upright portion 11 of each plate 9 is fitted, with the interposition of a respective brace 16, with an appendix 17 projecting outwards of frame 3 and perpendicular to plate 9.
• the four appendixes 17 are connected integrally to the top of respective bearings 6, and define respective coplanar feet by which frame 3 rests on base block 5.
• frame 3 comprises a gripping device comprising a plate 18, which is connected to one of the two shoulders 15, and is located inside housing 4, adjacent to said shoulder 15.
• Plate 18 is parallel to plane B, and is movable, parallel to itself and by means of four pneumatic actuators 19 located between said shoulder 15 and plate 18, towards the other shoulder 15 to grip castings 2 against fixed locators 20 fitted to bars 14 of the other shoulder 15.
• machine 1 also comprises a known percussion unit 21 for vigorously hammering castings 2 to break off the moulding material compacted inside castings 2 and so enable its removal by vibration .
• Percussion unit 21 is fitted to a vertical portion 22 of base block 5 facing the shoulder 15 fitted with locators 20, and comprises a number of known pneumatic hammers 23, which extend from vertical portion 22 towards said shoulder 15 in a direction perpendicular to plane B, and have respective heads which, when hammers 23 are operated, move between bars 14 to strike castings 2.
• Machine 1 also comprises a vibration unit in turn comprising two known unbalanced motors 24, each of which has a vertical axis of rotation 25, and is mounted on base member 13, at a respective plate 9, so that respective axis 25 lies in plane B.
• Each motor 24 is fitted to and projects from respective plate 9 by means of four fastening members 26 which, in addition to supporting motor 24, also prevent it from moving crosswise to respective axis 25.
• Castings 2 and motors 24 are preferably fitted to frame 3, so that the centre of each motor 24 is substantially on a level with the barycentre of frame 3 and castings 2 as a whole.
• each motor 24 is discharged in the plane of respective plate 9, which is thus subjected to mainly shear stress and practically no bending stress, and can therefore be made relatively thin; and the resultant of the forces generated by motors 24 is perfectly controlled.
• motors 24 are operated in phase with each other, the resultant of the forces generated by motors 24 is a pure moment which causes frame 3 to oscillate about an axis parallel to axes 25 of motors 24 and defined by the intersection of planes of symmetry A and B.
• motors 24 subject frame 3 to a controlled movement in a given direction, as opposed to separate, uncontrolled movements .
• machine 1 also comprises a crumbling device for crumbling the moulding material removed from castings 2.
• the crumbling device comprises a grate 27, which is fitted to frame 3, extends between plates 9, perpendicularly to planes A and B, is positioned facing housing 4, and has a rough surface on the side facing housing 4. Grate 27 being integral with and therefore vibrating together with frame 3, the moulding material detached from castings 2 is "grated" on grate 27 into powder or small pieces, which drop through the openings in grate 27 into a fixed bin 28 underneath.
• frame 3 is equipped with two deflectors 29, each located beneath a respective shoulder 15 and extending between and crosswise to plates 9. Operation of machine 1 will be clear from the above description, with no further explanation required.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Crushing And Pulverization Processes (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42174600

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (3)

Citations (3)

• 2009
  • 2009-06-09 IT IT000437A patent/ITTO20090437A1/it unknown
• 2010
  • 2010-06-09 WO PCT/EP2010/058094 patent/WO2010142730A1/en not_active Ceased
  • 2010-06-09 EP EP10724503.7A patent/EP2440348B1/en not_active Not-in-force

Patent Citations (3)

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