JP3138415B2 - Horizontal centrifugal casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal centrifugal casting apparatus, and more particularly, to a casting gutter for casting toward an inner surface of a mold rotating around its axis, and a molten metal supplied to the casting gutter. A hopper receiving the casting gutter, one end of the casting gutter is connected to the hopper, and the molten metal supply port of the hopper is connected to a runner of the casting gutter, and the other end of the casting gutter is provided. The present invention relates to a horizontal centrifugal casting apparatus provided with a pouring device provided with a pouring gate at an end thereof, and a pouring device for allowing the pouring gate to enter and exit the casting mold through a casting port provided at an end of the casting mold.

[0002]

2. Description of the Related Art Conventionally, in a horizontal centrifugal casting apparatus, as shown in FIG.
A sluice 4 is provided at the other end 1b of the hopper 2, which is connected to a molten metal supply port 2a for receiving the supply of the casting metal. It was provided at the tip that was provided.

[0003]

In [0008] the conventional horizontal centrifugal casting machine, because provided at the tip of the runner 3 sprue 4 is arranged substantially horizontally, during casting the casting molten metal 6 The flow becomes a parabolic falling flow,
As a result of turbulence when the metal collides with the inner surface of the mold 5, air is entrained, or the inner surface of the mold 5 is damaged by the collision of the molten cast metal 6 with the inner surface of the mold 5, as shown in FIGS. 5 and 6. Since the molten metal 6 is poured almost vertically into the mold, a rapid acceleration in the circumferential direction of the mold acts on the molten metal. As a result, the molten molten metal before solidification is disturbed, and slag,
There is a problem that casting defects occur due to entrainment of sand, flux, and the like. To address these issues,
As shown in FIGS. 7 and 8, in order to bring the gate 4 of the other end 1 b of the casting gutter 1 closer to the inner surface of the mold 5 that rotates downward, the casting gutter 1 is inclined. Although it is conceivable to dispose, the molten cast metal 6 cast from the pouring gate 4 is exposed to the rotating airflow A generated inside the mold 5, and as a result, the flowing speed of the molten cast metal 6 and the peripheral speed of the inner surface of the mold 5 are reduced. If there is a difference,
It is not easy to adjust the position of the pouring gate 4 so that the flow of the molten cast metal 6 is further disturbed and the molten cast metal 6 is allowed to flow down along the inner surface of the mold 5 exactly. Further, there is a new problem that it is not easy to adjust the flow speed to the peripheral speed of the inner surface of the mold 5 while maintaining the casting speed.

[0004] Therefore, an object of the present invention is to solve the above-mentioned problems, to cast a molten metal from a preferable position along the inner surface of a mold, and to provide a horizontal centrifugal casting equipped with a casting device capable of preventing occurrence of casting defects. Equipment.

[0005]

A first feature of the present invention for the above object is to form a first curved portion in which a runner at the other end is curved downward, and a gate is formed. The straight part provided at one end side of the runner is provided facing downward in the axial direction of the mold.
So that the gate is close to the inner surface of the mold.
It is allowed in a point that is configured to Soleil by (claim 1
Corresponding to). Thus, the cast molten metal that is Soleil from sprue, the inner surface of the mold by appropriately setting the radius of curvature of the runner of Ikomitoi, on leaving the sprue is not disturbed in a fluidized state
It can be guided smoothly downward along the direction, and it is possible to prevent a sudden change in the direction of the flow of the molten metal, so that the pouring gate is located at a suitable position while maintaining the casting speed of the molten metal. Further, if the flow rate of the molten metal in the runner is controlled, it is possible to easily adjust the flow rate of the cast molten metal flowing out of the gate. As a result, entrainment of air is eliminated, and casting is performed at a suitable position along the inner surface of the mold at a flow rate of the molten metal corresponding to the rotational speed of the mold, while preventing damage to the runner of the casting gutter. Therefore, it is possible to prevent the occurrence of casting defects due to entrapment of slag, sand, flux and the like during casting.

A second feature of the present invention for the above purpose is as follows.
The first is the first curve in which the runner on the other end is curved downward.
A part is formed, and a gate is provided downward, and the runner is further curved toward one side of the first curved portion of the runner that rotates downwardly on the inner surface of the mold. Second
Forming a curved portion lies in Ru tare (corresponding to claim 2). Obedience
Therefore, the molten cast metal from the gate is poured into the runner of the casting gutter.
By setting the radius of curvature appropriately,
Is smoothly invited downward without causing disturbance in the flow state
To prevent sudden changes in the flow direction of the molten metal.
To maintain a suitable position while maintaining the casting speed of the molten metal.
The pouring gate can be positioned and cast.
By controlling the flow rate of the molten metal, the falling speed of the cast molten metal that exits the gate
The degree can be adjusted easily. Also, one end of the first curved portion of the runner
The second curved portion formed on the side makes it easier to bring the sprue closer to the inner surface of the mold, and makes it possible to position the sprue closer to the casting pouring port of the mold, thereby facilitating the position adjustment of the sprue. As a result, air entrapment is eliminated
To prevent damage to the runner of the casting gutter,
In a suitable position along the surface,
It can be cast at the flow rate of hot water,
Rugs, sand, the generation of casting defects due to inclusion of the flux, or the like can securely prevented.

[0007] In addition, the straight portion provided on the one end side of the runner is disposed obliquely in a plan view with respect to the axial direction of the mold, and the pouring device is mounted on the inner surface of the mold. It is more preferable that the mold is configured to be relatively movable with respect to the mold in the longitudinal direction of the mold in a close state (corresponding to claim 3). With this configuration, the deflection angle of the second curved portion can be reduced, and the bending of the runner can be reduced, so that the influence on the flow of the molten metal in the runner can be suppressed. The fluid force exerted on the inner surface of the mold can be suppressed. As a result, damage to the mold and occurrence of casting defects can be more easily prevented.

The hopper is eccentric about a vertical axis and reciprocally driven to rotate so that the direction of the linear portion can be changed from the oblique direction in plan view to the axial direction in plan view with respect to the axial direction. It is even better if the casting device is provided as much as possible (corresponding to claim 4). If the hopper is eccentrically rotated about a vertical axis, it can be moved according to the shape of the tip of the casting gutter. It can be moved to a suitable position, and when the casting gutter enters or leaves, even if there is a bend in the runner at the spout, the spout can enter and exit the casting spout without any obstacle. As a result, regardless of the size of the mold, casting in which the occurrence of casting defects is prevented is enabled.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to components that are the same as components in the explanatory diagram of the related art or that have the same functions. Figures 1 and 2
1 is a view showing the concept of a horizontal centrifugal casting apparatus of the present invention, FIG. 1 is a plan sectional view thereof, and FIG. 2 is a sectional view of a mold cut along a rotation axis of the mold. FIG. 3 is a partial sectional side view showing the entirety of the horizontal centrifugal casting apparatus of the present invention. As shown in the figure, the horizontal centrifugal casting apparatus includes a rotating support wheel 7 for driving and rotating the mold 5, and casting toward the inner surface of the mold 5 that is supported on the rotating support wheel 7 and rotates around the axis C. The casting apparatus has a casting gutter 1 formed into a tubular shape for hot water and a hopper 2 for receiving molten metal supplied to the casting gutter 1.

The rotation support wheel 7 is provided with a drive source for supporting and rotating the mold 5, and placing the mold 5 thereon and driving the mold 5 to a required level. This is a conventionally used one configured to be able to rotate at a required rotation speed in the rotation direction R. The casting device P is configured to allow the casting gutter 1 to enter and exit the casting mold 5 from a casting opening 5 a provided at one end of the casting mold 5.

The casting gutter 1 has one end 1a side connected to the hopper 2 and a molten metal supply port 2a of the hopper 2 connected to the runner 3 of the casting gutter 1. A gate 4 is provided at the other end 1b end of the gutter 1. Further, a first curved portion 3b is formed by curving the runner 3 on the other end 1b side downward, and the gate 4 is formed downward, and the first curve of the runner 3 is formed. A second curved portion 3c formed by further curving the runner 3 toward the side where the inner surface of the mold 5 rotates downward is formed on the one end 1a side of the portion 3b. It is easy to approach the inner surface of. The curvature of the runner 3 of the first curved portion 3b and the second curved portion 3c is set within a range in which the flow of the molten metal flowing therethrough is not disturbed. In addition, the limit value of the range is determined by the hydrodynamic characteristic value that varies depending on the type of molten metal flowing inside, the temperature, etc., and the range of the curvature is determined based on the type, temperature, etc. of the expected cast metal. The curvature is determined according to the range, and the curvature is determined within the range. As a result of opening the gate 4 downward, when casting the gate with the gate 4 approaching the inner surface of the mold 5, the molten cast metal 6 flowing down from the gate 4 is moved along the rotation direction of the inner surface. The molten metal 6 is supplied to minimize the change in the flow direction of the molten cast metal 6 so as not to disturb the cast unsolidified molten metal. It is desirable that the flow speed of the molten cast metal 6 is not higher than the rotational peripheral speed of the inner surface, and it is more desirable that there is no difference between the flow velocity and the rotational peripheral speed.

The hopper 2 is provided to the casting apparatus P on the casting gutter 1 side from the molten metal supply port 2a around the vertical axis.
The straight portion 3a provided on the one end 1a side of the runner 3 is eccentrically supported so as to be reciprocally rotatable from a posture parallel to the plane C with respect to the direction of the axis C of the mold 5 to a posture oblique to the plane. I have.

The casting apparatus P moves close to the casting mold 5 during casting, holds the casting gutter 1 in an approaching / retreating posture (see FIG. 1 (b) ), and casts the casting mold 5. Mouth 5
a, the gate 4 is advanced into the mold 5 and the hopper 2 is driven to be eccentrically rotated about a vertical axis.
In the casting position (see FIG. 1 (a) )
Can be cast near the inner surface of the mold 5. Upon completion of the casting, the hopper 2 is again driven to be eccentrically rotated in the reverse direction, the casting gutter 1 is held in the entering and leaving posture, and the pouring gate 4 is withdrawn from the casting port 5a. is there. In the approaching / exiting posture, the casting gutter 1 is connected to the linear portion 3 with respect to the axis C.
a is positioned parallel to the plan view, and after the entry, the eccentric rotation of the hopper 2 causes the linear portion 3a to deflect to the casting position positioned obliquely with respect to the axis C in a plan view, The gate 4 is configured to approach the inner surface of the mold 5. The reason why the linear portion 3a in the casting position is positioned obliquely with respect to the axis C in plan view is to bring the gate 4 as close as possible to the weir forming the casting port 5a. It is what it was. Therefore, the provision of the second curved portion 3c allows the molten metal to be located closer to the weir than before, so that the flow of the molten metal to the casting port 5a side can be reduced as compared with the conventional case. .
As a result, casting defects generated on the casting side can be reduced.

Next, another embodiment of the present invention will be described. <1> In the above embodiment, the casting gutter 1 is flange-connected to the hopper 2. However, the present invention is not limited to this, and the casting gutter 1 is connected to the molten metal supply port 2a of the hopper 2.
A fitting portion may be provided in the portion to perform fitting connection. In order to form this fitting portion, a fitting portion may be provided in the molten metal supply port 2a to fit the one end 1a side of the casting gutter 1 into the molten metal supply port 2a. A portion may be provided so that the one end 1a side is fitted to the protruding portion. The connection is not limited to these, and any connection form such as connection using a screw can be adopted. In short, the molten metal supply port 2a and the casting gutter 1
It is sufficient that the hot water path 3 is securely connected. <2> As shown in FIG. 4, the casting gutter 1 may include only the straight portion 3a and the first curved portion 3b . In the drawing, (a) shows the casting posture, and (b) shows the approaching / leaving posture. Further, the straight portion 3a may be further provided with a third curved portion. In short, the gate 4 is opened downward and can be positioned close to the inner surface of the mold. I just need. <3> In the above embodiment, the hopper 2 is eccentrically supported around a vertical axis. However, the eccentric support may be a support method other than the shaft support. Note that the linear portion 3a is supported so as to be reciprocally rotatable from a posture parallel to the axis C in a plan view to a posture oblique in a plan view. It may be in the oblique direction. <4> The approach / retreat attitude may be such that the linear portion 3a is positioned obliquely with respect to the axis C in plan view. May be positioned parallel to the plane view. In short, the two positions are such that the gate 4 of the casting gutter 1 smoothly enters from the casting port 5a, moves to a position close to the inner surface of the mold 5, and further smoothly exits from the casting port 5a. Any posture is acceptable. <5> In the above embodiment, casting is performed with the casting port 5a side as a casting side, and the position of the gate 4 is fixed and cast with the other end side of the mold 5 as a tip side. However, the gate 4 may be inserted to the other end side of the mold 5 and retreated to the one end side while casting the metal. The casting may be performed while moving from the 5a side to the other end side. <6> The mold 5 is not specified, and the present invention can be applied to any horizontal centrifugal casting mold.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a schematic plan sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a front sectional view illustrating the embodiment shown in FIG.

FIG. 3 is a partial cross-sectional side view showing an embodiment using the present invention.

FIG. 4 is a schematic plan sectional view showing another embodiment of the present invention.

FIG. 5 is a schematic longitudinal sectional view showing an example of a conventional horizontal centrifugal casting apparatus.

FIG. 6 is a front sectional view illustrating the casting of FIG. 5;

FIG. 7 is a schematic vertical sectional view showing an improved example of a conventional horizontal centrifugal casting apparatus.

FIG. 8 is a front sectional view illustrating the casting of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting gutter 1a One end of casting gutter 1b The other end of casting gutter 2 Hopper 2a Melt supply port 3 Casting gutter runner 3a Straight portion of runner 3b First curved portion of runner 3c Second of runner Bending part 4 Gate 5 Mold 5a Casting port

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-218365 (JP, A) JP-A-3-57547 (JP, A) JP-A-1-100662 (JP, U) (58) Survey Field (Int. Cl. ⁷ , DB name) B22D 13/10 505

Claims (4)

(57) [Claims] 1. A casting gutter (1) for casting metal toward an inner surface of a mold (5) rotating around its axis, and the casting gutter (1).
And a hopper (2) for receiving molten metal supplied to the hopper (2).
And the molten metal supply port (2a) of the hopper (2) is connected to the runner (3) of the casting gutter (1), and the other end (1b) of the casting gutter (1). A gate (4) is provided at the side end, and the gate (4) is attached to the mold (5).
A horizontal centrifugal force casting device provided with a casting device (P) for entering and leaving the casting mold (5) from a casting opening (5a) provided at an end of the casting, wherein the other end (1b) side said runner (3) is to form a first curved portion which is curved downward (3b) of, provided toward said sprues (4) downwards, the end (1a of the runner (3) Straight section provided on the side
(3a) is inclined with respect to the axial direction of the mold (5) in plan view.
Along the direction, the gate (4) is inserted into the mold (5).
A horizontal centrifugal casting machine that is configured to make casting water close to the surface . 2. A mold (5) rotating around its axis.
Gutter (1) for pouring hot water toward the surface and its gutter (1)
Hopper (2) for receiving molten metal supplied to
One end (1a) of the casting gutter (1) is connected to the hopper (2).
And the molten metal supply port (2a) of the hopper (2)
Connected to the runner (3) of the casting gutter (1)
And a sprue at the tip of the other end (1b) of the casting gutter (1).
(4) is provided, and the gate (4) is connected to the mold (5).
From the casting port (5a) provided at the end of the mold (5)
Horizontal centrifugation with a casting device (P) to enter and exit
A force casting apparatus, wherein the runner (3) on the other end (1b) side is directed downward.
Forming a curved first curved portion (3b),
(4) is provided downward, and the one end (1a) side of the first curved portion (3b) of the runner (3) is directed toward the side rotating downward on the inner surface of the mold (5). Furthermore, the second curved portion which is curved to form a (3c) tare the runner and (3) Te key next centrifugal force casting apparatus. 3. A linear part (3a) provided on the one end (1a) side of the runner (3) is arranged obliquely in a plan view with respect to the axial direction of the mold (5), and The pouring device (P) is configured to be relatively movable with respect to the mold (5) in the longitudinal direction of the mold (5) in a state where the gate (4) is close to the inner surface of the mold (5). The horizontal centrifugal casting apparatus according to claim 1 or 2. 4. The hopper (2) is rotated about a vertical axis so that the direction of the linear portion (3a) can be changed from the oblique direction in plan view to the axis direction in plan view with respect to the axis direction. The horizontal centrifugal casting apparatus according to claim 3, wherein the casting apparatus (P) is eccentrically mounted on the casting apparatus (P) so as to be rotatable reciprocally.