JP2001030064A - Method for removing stuck material on inner part and exciting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing stuck material on an inner part, with which the inner part stuck material of powdery material of sand for core, and coating agent, etc., stuck on the inner wall surface of the hollow part in a work of a cast product, etc., having a complicate shaped hollow part, such as cylinder block, etc., for an engine, can surely be removed, and an exciting device used for this method. SOLUTION: The work C having the hollow part in the inner part, is supported with a rotary frame 2 which is supported with a rotary base 7 rotating around a first rotating shaft 7c and has a second rotating shaft 2c at a position crossed with the first rotating shaft 7c or at a twisting position. Then, the stuck material stuck on the hollow part is removed by rotating around the first rotating shaft 7c while rotating the work C around the second rotating shaft 2c in a state in which the abradant is injected into the hollow part of the work C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal device for removing internal deposits adhering to the inside of a workpiece by applying vibration to the workpiece so that abrasives inserted into the interior of the workpiece collide against the inner wall surface of the cavity. The present invention relates to an attached matter removing method and a vibration device.

[0002]

2. Description of the Related Art When removing a sand core after casting of a die-cast product, an opening of the casting is used to remove molding sand or a coating agent attached to the inside of a work such as a casting. Shot blasting and dry ice pets are directly injected from the surface, and are removed using the collision energy and the sublimation energy of dry ice.

However, in these methods, the surface directly hit by the ejected substance is removed, but it is impossible to remove other parts, for example, the inner wall part of the cavity. is there.

For this reason, a vibrator is used for sand removal after casting core sand for casting. For example, Japanese Unexamined Patent Publication No. 5-96362 requires a particularly large vibration force. There has been proposed a shaker for removing sand from a casting.

[0005] This vibrator is rotated in opposite directions by using two motors, and applies a vertical linear vibration force to a vibrating table on which a casting is placed. The vibration of the vibrating table causes the casting to make a jumping motion to collide with the upper and lower collision members, and the sand adhering to the casting is efficiently dropped by the impact force at the time of the collision.

Japanese Unexamined Patent Publication No. 4-172170 discloses a vibrating apparatus for vibrating a cast product by pressing a cast product supported by an air cushion by a high frequency compressed air vibrator.

[0007]

However, since the vibration applied by these vibrating devices is a reciprocating motion in one direction and only in a linear direction, it has a complicated shape like a cylinder block of an engine. In the case of a cast product having a cavity having a complicated shape inside, such as a water jacket, it is difficult to efficiently remove powder and granules such as sand for core and a coating agent. Therefore, it is necessary to frequently change the mounting direction of the casting, and there is a problem that it takes time and man-hours to remove the sand and the coating agent.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to adhere to the inner wall surface of a cavity of a workpiece such as a casting having a cavity having a complicated shape such as an engine cylinder block. It is an object of the present invention to provide a method for removing internal deposits that can reliably remove internal deposits such as powders and granules such as core sand and coating agents, and a vibrating apparatus used in this method.

[0009]

According to a first aspect of the present invention, there is provided a method of removing internal deposits, the method comprising: a first rotating shaft supported on a rotating base rotating about a first rotating shaft; A work having a cavity therein is supported on a rotating frame having a second rotation axis at a position intersecting or twisting, and the work is filled with an abrasive in the cavity of the work. The method according to claim 1, further comprising rotating around the first rotation axis while rotating around the second rotation axis to remove the deposit attached to the cavity. 2) Then, by this internal deposit removing method, the deposits, which are the casting sand for the core used in the casting and the coating agent, are removed from the work as the casting. 3) In the above-described method for removing internal deposits, the rotation speed around the first rotation axis and the rotation speed around the second rotation axis are simultaneously or individually varied.

[0010] In the above-described method for removing internal deposits, an abrasive (abrasive substance) such as a cut wire is inserted into the inside of a work, and the work is rotated around a first rotation axis by a vibrating device, and then the work is rotated. A work in which the direction and speed of the movement are forcibly changed three-dimensionally by rotating around the rotation axis 2 and, if necessary, by changing the rotation speed, and Collisions between the abrasive and the inertia-moving abrasive are generated at a high frequency, and the inner wall surface of the cavity is polished by using the collision energy to remove internal deposits. 4) The vibrating device used in the above method for removing internal deposits is
A rotation base that rotates about a first rotation axis, and a rotation that rotates around a second rotation axis at a position that intersects or twists with the first rotation axis on a bearing provided on the rotation base. The rotating frame is provided with a supporting portion for supporting a workpiece, and the rotating frame is provided with a rotation driving means for rotatingly driving the rotating frame and the rotating base. 5) Then, the rotating surface of the rotating frame and the rotating surface of the rotating base are formed to be orthogonal to each other. 6) Also, the vibrating device can be used as a casting sand removing device. In this case, the workpiece becomes a casting having a cavity therein, and the deposit attached to the cavity is a casting having a core formed therein. Sand and coating agent.

With the above configuration, the work is caused to rotate by the vibrator around the second rotation axis,
Since the second rotation axis is revolving around the first rotation axis, the work is forcibly moved three-dimensionally. As a result, the direction and strength of the centrifugal force due to the rotational motion acting on the abrasive change, so that the abrasive moves to the deep portion of the inner wall surface of the cavity and collides. Due to this collision,
Since the inner wall surface of the cavity is polished, a thin film such as a powder or a particle adhered to the cavity portion is peeled off and removed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 3, a method for removing internal deposits and a vibrating apparatus used in the method will be described with reference to FIGS. A description will be given taking removal of sand and a coating agent as an example. [Vibration Apparatus] First, a vibration apparatus used in the method for removing internal deposits according to the present invention will be described.

As shown in FIG. 1, the vibrating apparatus 1 includes a base bearing portion 9 provided substantially at the center of a base 4 and a rotating base 7 having a vertical base rotating shaft 7c. The rotation base 7 is provided by a first drive motor (first rotation drive means) M1 mounted on a motor support base 10a formed on the same base 4, and the rotation direction R shown in FIG.
1 is driven to rotate. That is, the rotation of the first drive motor M1 is transmitted to the base rotating shaft (first rotating shaft) 7c by the transmission belt 11, and the base rotating shaft 7c and the rotating base 7 fixed thereto are rotated in the rotation direction R1 (see FIG. It is formed to rotate in 1).

A second drive motor (second rotary drive means) M2 supported by a motor support 10b and a rotary frame bearing 3a are mounted on a rotary frame support 7a provided on the side surface of the rotary base 7. 3b, the rotating frame 2 is supported by the second drive motor M2.
Rotation direction R2 around the second rotation axis 2c (FIG. 3)
It is formed by connecting both shafts so that the shaft can be driven to rotate.

A supporting portion for fixing and supporting the casting C is provided on the rotating frame 2 by a supporting cylinder 6.
a, 6b, 6c and the supporting cylinders 6a, 6b, 6c
Are formed by pressing plates 8a, 8b, 8c provided on the drive rods of the above, and a pressing plate 8d provided on the rotating frame 2. The pressing plates 8a, 8b, 8c, 8d press and support the cast product (work) C. It is formed to be able to.

The rotating surface of the rotating frame 2 (B surface:
The YZ plane) and the rotation plane (A plane: XY plane) of the rotary base 7 are formed to be orthogonal to each other.

1 to 3, the distance D between the first rotating shaft 7c and the second rotating shaft 2c is fixed, but the motor support 10b and the rotating frame bearings 3a,
3b is formed so as to be contractible with a screw bolt or the like, and the distance D is configured to be variable, so that the work is rotated in two stages by various combinations of rotational movements, so that the effect of removing internal deposits can be improved. It can also be improved.

The first rotating shaft 7c and the second rotating shaft 2c
Are not necessarily arranged perpendicular to each other,
Although it is possible to arrange the rotating base 7 in an inclined state, if it is provided vertically, that is, if the rotating surface A of the rotating base 7 and the rotating surface B of the rotating frame 2 are formed to be orthogonal, the rotating base 7
Therefore, the interference between the movement of the casting C due to the rotation of the rotating frame 2 and the movement of the casting C due to the rotation of the rotating frame 2 is eliminated, so that the driving forces of the first and second drive motors M1 and M2 can be used sufficiently efficiently.

In FIGS. 1 to 3, if the distance D is not zero, the first rotary shaft 7c and the second rotary shaft 2c are in a twisted position, but this distance D is zero. When D is zero, it means that the first rotation shaft 7c and the second rotation shaft 2c are located at a crossing position. Regarding the intersecting positional relationship, besides this D being zero, for example, the bearing 3a for the rotating frame is arranged near the first rotating shaft 7c, and the straight line of the second rotating shaft 2c is May be arranged so as to intersect the straight line of the rotating shaft 7c. [Method of Removing Internal Deposits] Next, a method of removing internal deposits using the vibrating apparatus 1 will be described with reference to removal of foundry sand as an example.

The cast product (work) C such as a cylinder block of the engine after casting is removed from the mold and the sand is caused to flow down by turning the cast product C upside down. Roughly remove the core sand inside the cavity.

Then, an abrasive such as a cut wire is injected into the water jacket through an opening communicating with the hollow portion of the casting C, and the opening is closed with a lid if necessary, and then the supporting cylinders 6a, 6b , 6c are pressed from three directions by the pressing plates 8a, 8b, 8c, and the casting C is fixedly supported on the rotating frame 2 by the supporting portions.

After fixing and supporting the casting C, the first drive motor M1 and the second drive motor M2 are driven to
The rotation base 7 is rotated by the drive motor M1 to the base rotation shaft 7c.
The rotating frame 2 is rotated around the rotating shaft 2c by driving the second driving motor M2. That is, the casting C is rotated around the second rotation axis 2c,
Will also rotate around the base rotation axis 7c, which is the rotation axis of. At this time, the rotating surface A of the rotating base 7 and the rotating surface B of the rotating frame 2 rotate simultaneously while always being orthogonal.

By this combined two-stage rotation, the abrasive is three-dimensionally stirred inside the cavity of the casting C, and collides with the inner wall surface of the cavity to polish the inner wall surface. Internal deposits such as sand and coating agent adhering to the surface can be uniformly removed.

In the case where the opening is not covered with the lid, the peeled sand or the coating agent is discharged from the opening of the casting C to the outside during the rotation, or from the opening after the rotation is stopped. It is removed from the casting C by flowing down.

In the case where the opening is covered with a lid, the lid is removed after the rotation is stopped, and the abrasive material in the cavity and the powder or the coating agent peeled off from the inner wall are allowed to flow down, so that the casting is performed. Removed from article C.

During the operation, the work should be covered with the vibrating device 1 or placed in a dedicated work room so that the internal deposits such as sand do not fall on the worker or scatter around.

Then, the cast product C is simply obtained at a constant rotational speed.
When rotating at low speed, only the collision force due to the abrasive falling by gravity in the casting works at low speed rotation, and at high speed rotation, it is removed only by collision generated by acceleration action from zero speed to high speed That is, the removal efficiency is poor.

Therefore, by positively changing the rotation speed (rotation frequency) or reverse rotation, the inner wall surface of the casting C is more strongly and more frequently collided with the abrasive, so that the core Removal of residual sand such as sand and removal of residual coating agent is performed more powerfully and effectively.

It is preferable to rotate the two directions at the same time to obtain a combined impact effect. However, when the shape of the cavity of the work is relatively simple, the rotation is alternately rotated to remove the work. It is also possible to work. In this case,
Since it is only necessary to secure the rotational driving force in one direction, the vibration device can be made compact. [Effects] Therefore, according to the internal adhering matter removing method and the vibrating device having the above-described configuration, the following effects can be obtained.

The casting C is rotated about the first rotation axis 7c, and while applying a large horizontal centrifugal force, is further rotated in two steps around the second rotation axis 2c to apply a vertical centrifugal force. As a result, the abrasive injected into the cavity of the casting C can evenly collide with the inner wall surface of the cavity of the casting C, so that the internal deposits such as molding sand and coating agent remaining on the inner wall surface can be efficiently removed. Can be removed.

In particular, since the casting C is rotated in two stages, the relative movement between the abrasive and the workpiece in the cavity of the casting becomes intense, and the direction of the relative movement changes, so that the abrasive is removed. Since the abrasive reaches the deep portion of the cavity, the abrasive can collide with the inner wall at high speed, and the abrasive having various kinetic energies, i.e., collision energy, can collide with the casting surface of the inner wall. In addition, the molding sand and the coating agent can be efficiently removed by stripping.

Further, the rotating surface of the rotating base 7 (A surface: X-
By forming the rotation plane (B plane: YZ plane) of the rotating frame 2 orthogonal to the rotation plane (Y plane), interference between the two rotations is eliminated. Adjustment is relatively simple and easy, and the first and second
The driving force of the driving motors M1 and M2 can be used sufficiently efficiently.

[0033]

As described above, according to the method for removing internal casting sand and the vibrating apparatus of the present invention, the following effects can be obtained.

A rotating frame for supporting a workpiece such as a casting is rotated about a first rotation axis, and further,
The work can be combined with multi-directional centrifugal force by the two-stage rotating motion of rotating the rotating frame around the second rotation axis. Part, and evenly collide with the inner wall surface of the work cavity to polish the inner wall surface.Furthermore, the direction of the relative movement between the work and the abrasive material in the work cavity is determined. By changing the strength in various ways, the abrasive can be impacted with various kinetic energies and at high frequency.

Therefore, the internal deposits composed of powder or granules such as molding sand or a thin film such as a coating agent adhered to the inner wall surface of the cavity of the work can be efficiently removed, and the internal deposits in the work can be efficiently removed. The removal work efficiency can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a vibration device according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side view of FIG. 1;

[Explanation of symbols]

 C Cast product M1 First drive motor M2 Second drive motor 1 Vibration device 2 Rotating frame 2c Rotating shaft (second rotating shaft) 3a, 3b Rotating frame bearing 6a, 6b, 6c Supporting cylinder 7 Rotating base 7a Rotation Frame support 7c Base rotation axis (first rotation axis) 8a, 8b, 8c, 8d Press plate

Claims (6)

[Claims] A rotary frame supported on a rotary base that rotates about a first rotary axis and having a second rotary axis at a position that intersects or twists with the first rotary axis. A work having a cavity is supported, and in a state where an abrasive is injected into the cavity of the work, the work is moved to the second position.
And rotating around the first rotation axis while rotating around the rotation axis of (c), thereby removing the deposits attached to the cavity. 2. The method according to claim 1, further comprising: removing, from the workpiece, which is a cast product, molding sand for a core used for casting and a deposit which is a coating agent. 3. The method according to claim 2, wherein the rotation speed about the first rotation axis and the second rotation speed are different from each other.
3. The method according to claim 1, wherein the rotation speeds around the rotation axis are simultaneously or individually varied. 4. A rotating base that rotates about a first rotating shaft, and a second rotating shaft that is located at a position intersecting or twisting with the first rotating shaft on a bearing provided on the rotating base. A vibrating device comprising: a rotatable frame that is rotatable around the shaft; and a supporting portion that supports a workpiece is provided on the rotatable frame; and a rotation driving unit that rotatably drives the rotatable frame and the rotatable base. . 5. The vibration device according to claim 4, wherein a rotation surface of the rotation frame is orthogonal to a rotation surface of the rotation base. 6. The method according to claim 4, wherein the workpiece is a cast product having a cavity therein, and the deposit attached to the cavity is molding sand or a coating agent forming a core. The vibration device as described.