JP2807585B2 - Pouring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring apparatus for pouring water using a hanging weir.

[0002]

2. Description of the Related Art The applicant of the present invention is disclosed in
As disclosed in Japanese Patent No. 4363, a hanging weir for receiving molten metal supplied from a ladle in a fixed amount, a mold having a sand-type nozzle which can be freely attached to and detached from a molten metal falling nozzle of the hanging weir, and a molten metal of the hanging weir There has been proposed a pouring apparatus including a stopper penetrating a drop nozzle and abutting on a seat formed at an opening of a gate provided in the sand mold nozzle.

[0003]

In this pouring apparatus, the seat of the sand nozzle contacted by the stopper is renewed together with the mold every time the mold is changed. Therefore, it is not necessary to consider the durability of the sand mold nozzle. Since the hanging dam and the mold are in close contact with each other, it is possible to prevent the entrapment of air when pouring into the mold, to quickly fill the mold as a laminar flow of molten metal, and to prevent non-turning that is likely to occur in thin-walled castings. However, there is an advantage that the entrainment of impurities can be prevented, and on the other hand, a small amount of sand is mixed in the casting.

In pursuit of the cause of this phenomenon, as shown in FIG. 6, it was heated by a high-temperature molten metal (about 1400 ° C.) at the time of the previous pouring, and the temperature reached 800 ° C. or more. The stopper (graphite rod) 1 is a sand nozzle 3
By contacting the seat 5 of the spout 4 formed at a long time (10 seconds or more) as compared with the molten metal passage time (2 seconds) here, the sand mold in the hatched portion of the seat 5 is thermally It was finally found that the metal had deteriorated and was mixed into the molten metal as defective. In addition, 6 is a core.

The present invention has been made in view of the above points, and a pouring apparatus that opens and closes a spout by a stopper inserted into a spout of a sand nozzle of a mold through a molten metal dropping nozzle of a hanging weir, It is an object of the present invention to prevent the thermal deterioration of the sand nozzle seat against which the stopper comes into contact and to improve the quality of the product.

[0006]

According to the first aspect of the present invention, there is provided a hanging weir 71 for receiving molten metal supplied from a ladle in a fixed amount,
A mold 2 having a sand type nozzle 3 which can be freely moved toward and away from a molten metal drop nozzle 74 of the hanging weir 71;
In a pouring device having a stopper 1 which penetrates through 74 and is inserted into an opening of a gate 4 provided in the sand nozzle 3, a seat 5 formed in the opening of the gate 4 includes: This is a pouring device into which a heat-resistant seal member S that engages with the tip of the stopper 1 is inserted.

According to a second aspect of the present invention, the heat-resistant seal member S has flexibility.

[0008]

According to the first aspect of the present invention, the stopper 1 is inserted into the molten metal dropping nozzle 74 of the hanging dam 71 and the sand mold nozzle 3 of the mold 2 which are in contact with each other, and the stopper 1 is inserted into the gate 4 of the sand mold nozzle 3 in advance. The heat-resistant seal member S is pressed against the seat 5 of the gate 4 by the tip of the stopper 1, and the seat 5 is closed.
In this state, when the molten metal is supplied to the hanging dam 71 at a constant rate, and the stopper 1 is raised, the heat-resistant seal member S floats by the buoyancy received from the molten metal and opens the gate 4 sufficiently.
The molten metal in 71 is poured into the mold through the gate 4.

According to the second aspect of the present invention, since the heat-resistant seal member S has flexibility, a high degree of sealing can be maintained even if the stopper load is not so large.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS.

FIG. 2 is a plan view showing an outline of a casting line. In a lower mold forming machine 11 provided in two rows, a lower mold (sand mold) is formed inside a lower frame (back metal). As long as the lower die is not defective, the core is manually set in the lower die being conveyed on the core setting line 12, and the upper frame (back metal) is formed on the upper die forming machine 13 provided in two rows. An upper mold (sand mold) is formed inside the upper frame, and the upper frame and the lower frame conveyed by the core setting line 12 are framed by a frame aligning device 14, and the integrated upper frame and The lower frame is transported to the heat-resistant sealing member insertion device 16 by the transport line 15, where the presence or absence of a core is detected as described later, and only when there is a core, the ring-shaped heat-resistant seal is The member S (FIG. 1) is inserted, and the molten metal is poured into the mold by the pouring device 17. Further, the lower frame separated via a product cooling line 18 is transferred to a frame separating device 19, and the separated lower frame is transferred to the lower mold forming machine 11 via a product take-out line 20, and the upper frame is transferred via a line 21 to the upper mold. It is transported to the molding machine 13.

FIGS. 3 and 4 show the heat-resistant sealing member insertion device 16.

As shown in FIG. 3, the heat-resistant seal member insertion device 16 includes a heat-resistant seal member supply mechanism 31 for individually taking out and supplying a large number of laminated heat-resistant seal members, and a heat-resistant seal member supply mechanism 31. Core detecting mechanism 32 for detecting the presence or absence of a core in the mold from the gate of the mold 2a provided on the left side of the mold 2a
And a heat-resistant seal member insertion mechanism 33 provided on the right side of the heat-resistant seal member supply mechanism 31 to insert a ring-shaped heat-resistant seal member S (FIG. 1) into a gate of the mold 2b.

As shown in FIG. 4, the drive unit 43 of the heat-resistant seal member supply mechanism 31 is driven by a motor 41 via a rotation transmitting means 42.
Rotates the index table 44 by the index. On the index table 44, vertical guides 45 are erected in eight sections at equal pitch intervals, and a number of heat-resistant seal members are inserted and laminated in the respective vertical guides 45. Then, the index table 44 is index-rotated so that the eight sections are sequentially indexed to the take-out position at the 3 o'clock position in FIG. 3, and slid by the take-out cylinder 46 from the lower end of the vertical guide 45 at the take-out position. The heat-resistant seal members are supplied one by one to the draw-out plate 47, and the heat-resistant seal members are horizontally pulled out by the draw-out plate 47 to a pickup position described later.

As shown in FIG. 3, the core detecting mechanism 32 has an ascending and descending cylinder 52 and an ascending and descending guide 53 mounted on a fixed plate 51 positioned above the gate of the mold 2a as shown in FIG. Operating rod of the lifting cylinder 52
The lower end of 54 is connected to an elevating plate 56 that is guided by the elevating guide 53 on a rod 55 and that moves up and down while being horizontal. The elevating plate 56 is provided with a core detection rod 57. The core detection rod 57 is inserted through a fixed stroke from a gate opening on the upper surface of the upper frame, and when the lower end contacts the core in the middle thereof, the core detection rod 57 rises relatively to the descending elevating plate 56 and is not shown. A limit switch or the like is operated to confirm the presence of a core.

As shown in FIG. 3, the heat-resistant sealing member insertion mechanism 33 is provided with a traversing guide 62 along a frame 61, and a traversing plate 63 is movably attached to the traversing guide 62. Is moved between the pick-up position on the drawer plate 47 and the gate position of the mold 2b by a not-shown cylinder or a feed screw, etc., and as shown in FIG. The insertion head 65 is provided to be able to move up and down by the cylinder 64, and the balloon-shaped chuck 66 is attached to the insertion head 65.
And a heat-resistant seal detecting claw 67.

Then, the heat-resistant seal member insertion mechanism 33
At the pickup position on the drawer plate 47, the insertion head 65 is lowered by the head lifting / lowering cylinder 64, and the ring-shaped heat-resistant seal member S pulled out by the drawer plate 47
A balloon-shaped chuck 66 is inserted into the inner hole h of FIG. 1 and the balloon-shaped chuck 66 is expanded by compressed air to hold the heat-resistant seal member from the inside.
Then, the heat-resistant seal member is pulled up, the traversing plate 63 is further moved along the guide 62, and the heat-resistant seal member is transferred to a position corresponding to the gate of the mold 2b and stands by.

Next, the operation of the heat-resistant sealing member insertion device 16 will be described.

When the mold 2a is carried into the lower side of the core detecting mechanism 32 and is stopped, the elevating plate 56 is lowered by the elevating cylinder 52, and the core detecting rod 57 is moved to the mold 2a as shown in FIG.
And the presence or absence of the core 6 is detected. As long as the lower die is not defective in the core lowering line 12 (FIG. 2), the core 6 is manually lowered into the lower die being transported.
When the presence of the core 6 is confirmed by the core detection rod 57, the mold 2a is determined to be good.

When the core 6 is confirmed,
When the mold 2b is carried into the lower side of the heat-resistant seal member insertion mechanism 33 and stopped, the insertion head waiting on the gate is
The ring 65 is lowered by the head lifting cylinder 64 and the ring-shaped heat-resistant seal member S held by the expanded balloon-shaped chuck 66 is inserted into the gate 4 as shown in FIG. The balloon-shaped chuck 66 releases chucking by bleeding and contracting the internal air, lifts up by the cylinder 64, returns to the pickup position along the traversing guide 62, and picks up the next heat-resistant seal member S at this position. I do.

Next, FIG. 1 shows a main part of the pouring device 17. In this pouring device 17, a hanging weir 71 for temporarily storing molten metal supplied from a ladle (not shown) and pouring the molten metal into the mold 2 is fixedly disposed at a fixed position. The hanging weir 71 is provided with an irregular-shaped refractory material 73 inside a back metal 72. The hanging weir 71 is provided with a molten metal drop nozzle 74, and the molten metal drop port provided in the molten metal drop nozzle 74 is provided. 75 is stopper 1
It is provided with a larger diameter than that.

The stopper 1 compresses an upper mounting plate 82, a long shaft bolt 83 and a coil spring 84 mounted on the long shaft bolt 83 at the tip of a rod 81 vertically moved by a vertically moving cylinder (not shown). It is a graphite rod mounted by a lower mounting plate 85 that can move up and down.

The mold 2 is provided with a sand mold 92 by a cold box method inside a back metal 91 integrally formed with a metal frame 90.
Is provided. In general, the shell mold method is used for the back metal, but in this case, the cold box method is adopted, so that the dimensional accuracy can be improved.There is no need to heat the back metal 91 and the sand mold 92, so their deformation is reduced. No, it saves energy and reduces the amount of sand used. Cold box sand is easy to regenerate,
There are advantages such as resource saving.

The sand mold 92 is provided with a sand mold nozzle 3 which can freely contact and separate from the molten metal drop nozzle 74 of the hanging weir 71, and the sand mold nozzle 3 is provided with a sprue 4.
A seat portion 5 is provided which normally engages with the stopper 1 inserted through the molten metal drop nozzle 74 of the hanging dam 71.

A seat 5 formed at the opening of the gate 4
Further, a ring-shaped heat-resistant seal member S that is engaged with the spherical surface 1a formed at the tip of the stopper 1 is inserted by the heat-resistant seal member insertion device 16.

The heat-resistant sealing member S is a hollow ceramic fiber molded product (trade name: fiber sleeve) formed by sucking ceramic fiber into a cylindrical shape and formed into a circle. It has heat insulation, flexibility and elasticity.

Next, the operation of the pouring apparatus shown in FIG. 1 will be described.

When the mold 2 whose core 6 has been confirmed by the core detecting rod 57 of the heat-resistant seal member inserting device 16 is carried into the pouring position, the mold 2 is lifted by a mold elevating mechanism including a spring (not shown). The sand mold nozzle 3 of the mold 2 is brought into close contact with the molten metal dropping nozzle 74 of the hanging weir 71 by the elastic pressing force.

Further, the rod 81 is lowered by a vertically moving cylinder (not shown), and the stopper 1 is inserted into the sand mold nozzle 3 through the molten metal falling nozzle 74 of the hanging dam 71 as shown by a two-dot chain line in FIG. The stopper 1 is pressed against the heat-resistant seal member S previously inserted into the gate 4 of the sand mold nozzle 3 by the heat-resistant seal member insertion device 16 by the elastic pressing force accumulated in the compression coil spring 84. Then, the heat-resistant seal member S is pressed against the seat 5 of the gate 4 so as to close the gate 4.

Since the heat-resistant seal member S has flexibility, the upper peripheral edge of the inner hole h of the heat-resistant seal member S and the spherical surface 1a at the tip of the stopper 1 are in close contact over the entire circumference. The outer peripheral edge of the lower portion and the seat portion 5 of the gate 4 are in close contact with each other over the entire circumference, so that high sealing performance can be maintained even if the load of the spring 84 applied to the stopper 1 is not so large.

In this state, after a certain amount of molten metal is supplied from a ladle (not shown) to the hanging weir 71, the stopper 1 is raised and pulled up from the inner hole h of the heat insulating member S. Is injected into the gate 4 of the sand mold nozzle 3 from the molten metal dropping port 75 of the molten metal dropping nozzle 74. At this time, since the heat-resistant seal member S does not rise from the seat 5 of the sand mold nozzle 3 due to buoyancy received from the molten metal and narrows the opening of the gate 4, the flow rate of the molten metal at the gate 4 is reduced by the heat-resistant seal member S. Therefore, the entire molten metal in the hanging dam 71 is poured into the casting mold 2 through the gate 4 in a short time (about 2 seconds).

The stopper 1 is heated by a high-temperature molten metal (about 1400 ° C.) at the time of the previous pouring and has a high temperature of 800 ° C. or more. It takes 10 seconds or more to supply a fixed amount of
Since the high-temperature stopper 1 does not come into direct contact with the seat 5 of the sand nozzle 3 by the heat-resistant sealing member S, the high-temperature stopper 1 is directly pressed into contact with the seat 5 of the sand nozzle 3 for several ten seconds as in the prior art. This can prevent collapse of the seat 5 caused by thermal deterioration.

When the pouring of one mold has been completed in this way, the mold 2 is lowered onto a conveyor (not shown) and carried out from the pouring position. The heat-resistant seal member S is disposable by one pouring.

If it is confirmed by the core detecting rod 57 of the heat-resistant seal member inserting device 16 that the core 6 is not present, the operator judges that the mold is defective and inserts the core intentionally. Since there is no mold, the heat-resistant seal member S is automatically controlled so as not to be inserted or poured into the mold having no core.

[0035]

According to the first aspect of the present invention, in a pouring device for opening and closing a sprue by a stopper inserted into a sprue of a sand mold nozzle of a mold, a seat formed at an opening of the sprue includes Since the heat-resistant seal member that engages with the tip of the stopper is inserted, the heat-resistant seal member functions as a thermal buffer for the high-temperature stopper, prevents the sand mold from collapsing due to thermal deterioration of the seat, and improves product quality. be able to.

According to the second aspect of the present invention, since the heat-resistant sealing member has flexibility, there is an advantage that a high degree of sealing can be maintained even if the load applied to the stopper is not so large.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a pouring device of the present invention.

FIG. 2 is a plan view showing an outline of a casting line in which the pouring device is incorporated.

FIG. 3 is a plan view of a heat-resistant sealing member insertion device provided in front of the pouring device.

FIG. 4 is a front view of the heat-resistant seal member insertion device.

FIG. 5 is a cross-sectional view of the mold when a core is detected by the heat-resistant seal member insertion device.

FIG. 6 is a cross-sectional view of a mold showing an operation of a stopper in a conventional pouring device.

[Explanation of symbols]

 S Heat-resistant sealing member 1 Stopper 2 Mold 3 Sand mold nozzle 4 Gate 5 Seat 71 Hanging dam 74 Drop nozzle for molten metal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 41/16 B22D 7/06 B22D 11/10 310

Claims (2)

(57) [Claims] 1. A hanging weir for receiving molten metal supplied from a ladle in a fixed amount, a mold having a sand-type nozzle which can be freely attached to and detached from a molten metal falling nozzle of the hanging weir, and a molten metal falling nozzle of the hanging weir. A pouring device provided with a stopper inserted into an opening of a sprue provided in the sand mold nozzle; a seat formed in the opening of the sprue; A pouring device, wherein a sealing member is inserted. 2. The pouring device according to claim 1, wherein the heat-resistant sealing member has flexibility.