Casting sand shake-out method and its apparatus

Details Casting sand shake-out method and its apparatus Casting sand shake-out method and its apparatus

1999-06-25

2003-11-11

Dunn, Tom (Department: 1725)

Metal founding

Process

Shaping liquid metal against a forming surface

C164S132000, C164S260000, C164S344000, C164S345000, C164S346000, C164S401000, C164S404000

Reexamination Certificate

active

06644382

ABSTRACT:

BACKGROUND ART
The present invention relates to shake-out of casting sand, and more particularly to an effective shake-out method of casting sand by characterizing the properties of vibrations given to the casting.
The prior art considered to be closest to the present invention is disclosed in Japanese Laid-open Utility Model No. 2-11659. Explaining its outline according to
FIG. 8
, a frame
3
is fixed on a stationary member
1
through an elastic piece
2
, lower ends of plate springs
4
disposed in an oblique direction are coupled to the frame
3
, and upper ends of the plate springs
4
are coupled to the lower surface of a conveyor
5
. The conveyor
5
is formed of a long plate, and its section is open upward in a pi-shape. The conveyor
5
is provided with vibrations for conveying, and vibrating means
6
is provided for this purpose. That is, a support shaft
8
is attached to a bracket
7
fixed on the frame
3
, and a rotating plate
9
is fixed on this shaft
8
. A belt
11
is applied between a motor
10
coupled on the frame
3
and the rotating plate
9
, and one end of a conduction rod
12
is linked to an eccentric shaft
13
, and other end of the rod
12
is linked to a fixed shaft
14
. The fixed shaft
14
is fitted to a bracket
15
welded to the lower side of the conveyor
5
.
When the rotating plate
9
is rotated by the motor
10
, the conveyor
5
is vibrated in the lateral direction in the diagram by means of the eccentric shaft
13
and conduction rod
12
. At this time, deflecting in the falling direction and standing direction of the plate springs
4
, the conveyor
5
sinks rightward in the falling direction, whereas the conveyor
5
rises leftward in the standing direction. Therefore, a casting
16
on the conveyor
5
is fed leftward in the diagram by the standing motion components of the plate springs
4
.
A hammer
17
is fixed to the upper side stationary member
1
, and a chisel
19
is fixed at the end of its operation rod
18
. As castings
16
are fed successively by the conveying vibration of the conveyor
5
, the hammer
17
hits the castings
16
to shake out the sand. Since the casting is vibrated on the conveyor
5
, the sand remaining on the casting
16
is shaken out.
The casting
16
on the conveyor
5
is only moved by vibration, and the vibration itself is not utilized sufficiently. That is, it is not utilized directly in the action for collapsing the solidified sand and core in the recess of the casting
16
and separating them from the casting. Yet, by hitting the casting
16
on the conveyor
5
by the hammer
17
, the plate springs
4
are loosened, and the impact applied to the casting
16
is lessened, and the sand is not shaken out sufficiently.
Japanese Laid-open Patent No. 61-33762 discloses a sand shake-out method by applying vibration while inclining the casting. Its outline is shown in
FIG. 19
, and it is explained in the first place. A casting
103
is suspended on a guide rail
101
by a hanger
102
, and is transferred in the vertical direction to the sheet of paper of FIG.
19
. An L-shaped rotary arm
106
is attached to a column
104
through a shaft
105
, and a vibration plate
108
is supported by a hanger spring
107
. A support spring
109
and a vibrating device
110
are installed between the vibration plate
108
and rotary arm
106
. A working cylinder
111
is supported on a stationary member
113
on a shaft
112
, and a cylinder rod
114
is coupled to the lower part of the rotary arm through a shaft
115
. A distance piece
116
is fixed to the vibration plate
108
.
Explaining the operation of this device, in the shown state, vibration is applied to the casting
103
by inclining it, and while this device is not operating, since the piston rod
114
of the working cylinder
111
is contracted, the rotary arm
106
is erect in the vertical direction, and hence the vibration plate
108
is also erect. In this state, when the casting
103
is moved as being suspended in the vertical direction and stops before this device, this time, the rotary arm
106
is inclined by the output of the working cylinder
111
, and the vibration plate
108
is also inclined simultaneously with the casting
103
. In this state, the vibration plate
108
vibrates to separate the sand sticking to the casting
103
.
The basis concept of this prior art is to push the casting
103
suspended in the vertical direction from the side and press the casting
103
to the vibration plate
108
. Therefore, this pressing force is determined by the mass or inclination angle of the casting
103
. When the vibration plate
108
vibrates in such condition, the casting
103
receives vibrations, but since the casting
103
is suspended, the pressing force is small, and sufficient vibrations are not transmitted to the casting
103
, and thereby separation of the sand is insufficient. Moreover, since the casting
103
is not fixed on the vibration plate
108
, when the vibration plate
108
vibrates, the casting
103
is set in an escaping phenomenon, and finally the casting
103
is not vibrated sufficiently. Yet, the direction of inclination is either the direction as shown in
FIG. 19
or its reverse direction, and the sand may not be separated completely depending on the shape of the casting
103
. In particular, the direction of inclination is important in collapse and discharge of core sand.
SUMMARY OF THE INVENTION
It is an object of the invention to solve the aforesaid problems, and bring about better effects by selecting the direction of vibration depending on the shape of the casting or other conditions. The sand shake-out method of the invention is characterized by fixing the casting on a support member, and hitting the casting by a hammer while vibrating this support member. By fixing the casting on the support member, and vibrating the support member in this state, a strong vibration is transmitted to the casting, and motion components for separating the sand from the casting are obtained powerfully. Since the casting exposed to such vibrating state is hit by the hammer, the sand is separated by the impulsive motion energy. In particular, the vibration applied to the support member is a so-called micro-vibration of high frequency and small amplitude, while hitting by hammer is low in frequency but is extremely high in the impact of single blow, and by combination of properties of such vibrations, destruction and separation of sand are effected by vibration of the support member, and the stubborn sand sticking to the casting can be separated from the casting by the strong impact force of the hammer.
The vibration applied to the support member is intended to have a conveying performance in one direction, and the sand sticking to the inside and outside of the casting is separated by this vibration from the casting and discharged, and an impulsive vibration is also given to the casting by the hammer to send out the sand falling on the support member in one direction, so that the separating direction and discharging direction of the casting sand can be appropriately set by the vibrating characteristic having the conveying performance depending on the shape of the casting.
The support member may be divided into two sections, and the casting may be fixed on both support members, and only one support member may be vibrated, and in this case, when either support member is vibrated, its vibration is transmitted to the other support member through the casting, and, as a result, both support members vibrate similarly, so that the vibration on the casting is obtained in a specified manner.
When the support member is divided into two sections, the casting may be also fixed on both support members and both support members may be vibrated, and in this case a stronger motion energy is applied to the casting by vibration of the both.
The vibration applied to both support members has a conveying performance in one direction, conveying directions of vibrations of both support members are set in mutually opposite directions, and after a vibratio

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