JPH06269918A - Method for pouring molten metal in vertical casting machine - Google Patents

Abstract

PURPOSE:To reduce the fall of molten metal, to restrain the spattering of the molten metal and to avoid the effect to the casting quality causes by the spattering by pouring the molten steel in the condition of inserting of inserting a bottom-pouring type ladle into at least the inner part of an upper die from a pouring hole. CONSTITUTION:The ladle 31 containing the molten metal M beforehand is entered from the pouring hole 37 and slowly descended through a runner part 38 and a product part space R, and at the time of inserting the lower end of this ladle 31 into a pressurizing sleeve 25, this ladle is stopped. Then in the still state of the ladle 31, a stopper 35 is pulled up to open a pouring hole 33 and the molten metal M is poured into an upper space R of a pressurize-plunger 12. At this time, initially, the molten metal is slowly poured without fully opening the pouring hole 33 at once, and after storing the molten metal M to some extend, by fully opening the pouring hole 33, the spattering of the molten metal M is restrained. Further, even if the spattering of the molten metal M is generated, as the fall from the ladle 31 to the pressurizing sleeve 25 is short, the spattering of the molten metal M does not reach the product part space R and the pouring hole 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring method in a vertical pressure casting machine for the purpose of forging molten metal.

[0002]

2. Description of the Related Art As a vertical type pressure casting machine of this type, there is one having a structure shown in FIG. In this conventional pressure casting machine, a lower mold (movable mold) is attached to a fixed platen portion 1a on an upper part of the frame 1.
An upper die (fixed die) 3 forming a die 2 together with 4 is fixedly supported, while the lower die 4 is fixed to a movable platen 5, and a die clamping cylinder 6 provided at a lower portion of the frame 1 The lower mold 4 is movable platen 5 according to the expansion and contraction operation.
The mold is clamped and the mold is opened by moving up and down together with it.

The upper mold 3 is provided with a pouring port 7 which communicates with a product part space R formed between the upper mold 3 and the lower mold 4, and a guide groove 8 which intersects with the pouring port 7. Are formed. The guide groove 8 is provided with a pouring spout closing block 10 that slides in the horizontal direction according to the expansion and contraction movement of the cylinder 9. The pouring spout closing block 10 is a part of the pouring spout 7. A runner part 11 is formed.

The lower mold 4 is formed with a pressure sleeve 25 located on the same axis as the pouring port 7,
A pressure cylinder 13 formed by connecting a pressure plunger 12 to the tip of a piston rod 14 is provided below the pressure cylinder 12, and the pressure plunger 12 is inserted into the pressure sleeve 25 and the tip portion thereof is connected to the product. It faces the space R.

On the other hand, a shaft 16 is integrally keyed to the boss portion 15 of the frame 1, and the boss portion 15 itself is rotatably supported by a support 18 via a bearing 17, and A two-step chain sprocket 19 is fixed to the shaft 16.

Further, a motor 20 is provided on the side of the support 18, and there are two threads between the chain sprocket 22 fixed to the output shaft 21 of the motor 20 and the chain sprocket 19 on the frame 1 side. Chain 23
Is wrapped around. The frame 1 can be rotated to an arbitrary position by starting the motor 20.

Therefore, in the pressure casting machine configured as described above, as shown in FIG. 4, the frame 1 is erected so that the pouring port 7 is directly above, and then the upper mold 3 and The lower mold 4 and the mold are clamped. And, the pouring block closing block 10
The molten metal passage 11 is aligned with the pouring port 7, and the molten metal is supplied from the pouring port 7 to the pressure sleeve 25 using the ladle 24.

After that, the pouring mouth closing block 10 is slid by the operation of the cylinder 9, the position of the runner 11 is displaced from the pouring opening 7, and the pouring opening 7 is closed by the pouring opening closing block 10 and then added. The pressurizing plunger 12 is moved upward by a predetermined amount by the pressurizing cylinder 13 to fill the molten metal in the pressurizing sleeve 25 into the product space R and pressurize it.

As a result, due to the pressurizing effect in the solidification process of the molten metal, for example, the generation of shrinkage cavities and the adverse effect of residual gas are suppressed, the structure is densified, and a high quality casting without casting defects is obtained. It will be.

When casting is completed as described above,
The frame 1 is rotated to an arbitrary position by starting the motor 20, and then the mold is opened to take out the product.

[0011]

However, in the pouring method in the conventional pressure casting machine as described above,
As shown in FIG. 5, the so-called tilted ladle 24 is used for pouring the molten metal from the pouring port 7, so that the molten metal M rebounds at the tip surface of the pressure plunger 12.
Some of them are product space R, pouring spout 7 or runner part 11
Will jump into. When the splashed molten metal M enters the product part space R, the casting surface defect of the casting and the occurrence of a molten metal boundary portion are caused, and the lubricant applied to the sliding portion between the pressure sleeve 25 and the pressure plunger 12 is Entrainment may occur, and casting quality cannot be improved.

When the spattered molten metal M adheres to the pouring port 7 and the runner part 11, it is caught in the sliding part between the upper die 3 and the pouring port closing block 10 to fill the pouring port closing block 10. In addition to the malfunction of the product, the slag formed by the adhesion of the molten metal may be mixed into the product, which may also affect the casting quality.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a pouring method which avoids the influence of the rebound of the molten metal on the casting quality.

[0014]

According to the present invention, a pouring port is formed in the upper mold of an upper mold on the fixed platen side and a lower mold on the movable platen which form a product space, and a lower mold is formed on the lower mold. Is a pressure sleeve in which a vertically movable pressure plunger facing the product space is inserted is provided on the same axis as the pouring port,
After the molten metal poured from the pouring port is stored in the pressure sleeve and the pouring port is closed, the pressurizing operation of the pressure plunger fills and pressurizes the molten metal in the pressure sleeve with the product space. In the pouring method in the vertical casting machine, the pouring is performed with the lower pouring ladle being inserted from the pouring port to at least the inside of the upper mold.

[0015]

According to this method, since the lower pouring type ladle is put into the upper mold to perform the pouring, the difference between the lower pouring type ladle and the pressure plunger is much smaller than that of the conventional method. The bounce of the molten metal is suppressed, and as a result, the splashed molten metal can be prevented from jumping into the product space or the pouring port.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a diagram showing an embodiment of the present invention.
The same parts as those in No. 5 are designated by the same reference numerals.

As shown in FIG. 1, in the present embodiment, a hollow cylindrical lower pouring type ladle 31 is used for pouring the molten metal. This lower pouring type ladle 31 has a center of a bottom portion 32a of a ladle body 32. While forming the spout 33 in the part,
A frustoconical stopper (tap) 35 is connected to the tip of a rod 34 inserted into the ladle body 32.
The pouring spout 33 is opened and closed by the raising and lowering operation of the stopper 35 by the rod 34.

A hole 36 for overflowing the molten metal M is formed in the upper portion of the outer peripheral surface of the ladle body 32, as will be described later.

On the other hand, the pouring port 37 on the upper die 3 side and the runner 38 of the pouring port closing block 10 are both formed in a cylindrical shape, unlike the conventional conical shape.
The diameter of the runner 38 is slightly larger than the diameter of the ladle 31 so as to smoothly receive the ladle 31, and smaller than the diameter of the pressure sleeve 25 on the lower die 4 side.

Therefore, when pouring the molten metal using the ladle 31, the ladle 31 containing the molten metal M in advance is inserted from the pouring port 37 as shown in FIG.
8 and the product space R, and gently lowers, and stops when the lower end of the ladle 31 enters the pressure sleeve 25.

Then, with the ladle 31 kept stationary, the stopper 35 is pulled up together with the rod 34 to open the pouring port 33, so that the molten metal M in the ladle 31 causes the upper space R of the pressure sleeve 12 of the pressure sleeve 25 to rise.
_It is poured into ₁ .

At this time, if the pouring spout 33 is initially slowly poured without fully opening it all at once, and the pouring spout 33 is fully opened after the molten metal M has accumulated in the pressure sleeve 25 to some extent, the molten metal M will bounce off. Suppressed. In addition, even if the molten metal M bounces off, since the drop from the ladle 31 to the pressure sleeve 25 is much smaller than before, the amount of the bounced molten metal M is mostly small. It is received by the bottom surface 32a of the above and can be prevented from jumping into the product part space R or the pouring port 37 side.

Prior to the above pouring, when the molten metal M contained in the heat insulation furnace 39 is pumped up by the down-pouring ladle 31, as shown in FIG.
1 is gently immersed in the molten metal M, the spout 33 is opened to allow the molten metal M to flow in from the lower side, and a part of the molten metal M is allowed to overflow from the holes 36. It is possible to prevent the ladle 31 from pumping up the lint and the like floating on the surface of the molten metal M in the furnace 39, and the amount of the molten metal M to be pumped up is measured.

When a specified amount of the molten metal M is drawn by the ladle 31, the spout 33 is closed and the ladle 31 is pulled up from the heat insulation furnace 39 as shown in FIG. By only tilting and discharging a part of the molten metal M, it is possible to prevent the molten metal M from dripping from the ladle 31 during transportation.

FIG. 3 is a diagram showing another embodiment of the present invention, showing an example in which a ladle 41 having a pressurizing cylinder 43 for pouring is attached to a ladle body 42. As shown in FIG. 3, a pouring nozzle 44 extending from the ladle body 42 is inserted from the pouring port 7 of the upper mold 3 to a deep inside of the upper mold 3, and the pouring port 45 of the pouring nozzle 44 is inserted into the pressure sleeve 25. The molten metal is poured by pressurizing the pressurizing cylinder 43 in a state of being brought close to. In this case, the pouring nozzle 44 may be inserted up to the pressure sleeve 25 as needed.

Also in this embodiment, the drop from the ladle 41 to the pressure sleeve 25 is smaller than in the conventional case, and the rebound of the molten metal M is suppressed.

[0027]

As described above, according to the present invention, since the bottom pouring type ladle is poured from the pouring port at least inside the upper mold, the pouring is performed directly from the pouring port as in the conventional case. As compared with the case of pouring the molten metal, the head of the molten metal becomes smaller and the rebound of the molten metal can be suppressed. As a result, the splashed molten metal does not jump into the product part space or the pouring port side, and it is possible to prevent casting defects such as the conventional casting surface defects, the occurrence of molten metal boundary parts, and the inclusion of molten slag to improve casting quality. In addition, there is an effect that it is possible to prevent the molten metal slag from being caught in the gate closing mechanism and to smoothly and stably stabilize its operation.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the lower pouring type ladle shown in FIG. 1 when collecting molten metal.

FIG. 3 is an explanatory cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 4 is an explanatory sectional view showing an example of a conventional vertical pressure casting machine.

5 is an enlarged explanatory view of a main part of FIG.

[Explanation of symbols]

 1a ... Fixed platen part 2 ... Mold 3 ... Upper mold 4 ... Lower mold 5 ... Movable platen 10 ... Pouring block block 12 ... Pressure plunger 25 ... Pressure sleeve 31 ... Down pouring ladle 33 ... Spout 35 ... Stopper 37 ... Pouring spout 41 ... Bottom pouring ladle M ... Molten metal R ... Product space

Claims (1)

[Claims] 1. A pouring port is formed in the upper mold of the upper mold on the fixed platen side and the lower mold on the movable platen forming the product space, while the lower mold moves up and down facing the product space. A pressure sleeve in which a possible pressure plunger is inserted is provided on the same axis as the pouring port, and the molten metal poured from the pouring port is stored in the pressure sleeve to close the pouring port, In a pouring method in a vertical casting machine in which a molten metal in a pressure sleeve is filled and pressurized by a pressurizing operation of a pressure plunger to perform casting, a downward pouring ladle is at least from the pouring port. A pouring method for a vertical casting machine, which is characterized in that pouring is performed with the inside of the upper die inserted.