JPH0569117A - Casting method - Google Patents

Abstract

PURPOSE:To provide a serial casting method, by which the casting can be complete without pouring into a certain mold, when that mold is not favorable. CONSTITUTION:In a molding process 1, a cope and drag are molded in a cope flask and a drag flask, respectively. In a core setting process 2, the cope is set only to the mold having good condition after observing the molding condition. In a molding flask jointing process 3, the cope flask and the drag flask are jointed. In a cope checking process 4, a core checking bar is inserted from a sprue in the mold to check existence of the core. In a heat resistant seal member inserting process 5, only at the time of confirming the existence of the core in the core checking process 4, the heat resistant seal member for protecting the seat part of the sprue in inserted from the tip part of a high temp. stopper for opening/closing the sprue in the mold. In a molten metal pouring process 6, the molten metal is poured only into the mold confirmed the existence of the core. In a product cooling process 7, the high temp. product after pouring the molten metal, is cooled. In a flask separating process 8, the cope flask and the drag flask are separated. In a product taking-out process 9, the product is taken out of the flask.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting method for pouring molten metal based on the presence or absence of a core.

[0002]

2. Description of the Related Art As shown in FIG. 7, a general casting line is a process A in which a mold is formed in an upper frame and a lower frame.
A step B for placing the core in the mold, a step C for aligning the upper frame and the lower frame, a step D for pouring molten metal into the molds for both frames, and a step E for cooling the product. It includes a step F of separating the frame and the lower frame and a step G of taking out the product from the frame.

[0003]

In the molding step A,
A sand mold is made in the frame by a molding machine, but this sand mold is not always perfect. For this reason, an unfavorable product may be obtained by the pouring step D.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a casting method which does not require pouring of molten metal when the molding is not preferable.

[0005]

According to a first aspect of the present invention, there is provided a step 1 of forming a mold in a frame and a core 106 in the mold.
In the casting method including at least the step 2 of filling the mold and the step 6 of pouring the molten metal into the mold, the core 106 is placed only in the mold in a good state by observing the molding state, and the core 10 is put into the mold in the defective state.
Core diaper process 2 that does not store 6, and a mold spout before pouring
Inserting the core detection rod 57 from 104, core detection step 4 for detecting the presence or absence of the core 106, and pouring into the mold with the core 106, and filling into the mold without the core 106. The casting method comprises a pouring step 6 in which the pouring is stopped.

According to the second aspect of the invention, the step 1 of forming a mold in the frame and the step 2 of placing the core 106 in the mold
In the casting method, at least the step 6 of controlling pouring into the mold by the stopper 101 inserted into the gate 104 of the mold that penetrates the dam 71 and is in close contact with the dam is used. The core filling step 2 in which the core 106 is placed only in the mold in the good condition and the core 106 is not placed in the mold in the defective state.
When the core detection step 4 is performed to detect the presence or absence of the core 106 by inserting the core detection rod 57 from the gate 104 of the mold before pouring, and when the presence of the core 106 is confirmed in this core detection step 4. Only, a heat-resistant seal member inserting step 5 for inserting the heat-resistant seal member S into the gate 104 to protect the seat portion 105 of the gate 104 from the high temperature stopper 101 by engaging with the tip of the stopper 101,
The casting method is configured by pouring the molten metal into the mold having the core 106 and suspending the pouring into the mold without the core 106.

[0007]

According to the first aspect of the invention, since the core diaper to be inserted into the mold is selected depending on the quality of the molding, the spout 10 of the mold before pouring is provided.
When the core detecting rod 57 is inserted from 4 and the core 106 cannot be detected, the molten metal is not poured into the mold.

According to the second aspect of the invention, when the core detecting rod 57 is inserted and the presence of the core 106 is confirmed, the gate of the mold is
The heat-resistant seal member S for protecting the seat 105 on the 104
In the next pouring step, the stopper 101 is inserted into the gate 104 of the mold that penetrates the latch weir 71 and is in close contact with the latch weir.
The seat portion 105 of the sprue 104 is opened and closed with the heat-resistant seal member S interposed therebetween to control pouring into the mold.

[0009]

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

FIG. 1 is a flow chart showing an outline of the casting method. A molding process 1 for molding an upper mold and a lower mold in the frames of an upper frame and a lower frame, respectively, and a core set in the lower mold. Baby diaper process 2, frame alignment process 3 for aligning the upper and lower frames, and a core detection process 4 for detecting the presence or absence of a core by inserting a core detection rod from the gate of the mold before pouring. , Only when the presence of the core is confirmed in this core detection step 4,
The heat-resistant seal member inserting step 5 of inserting a heat-resistant seal member for protecting the seat portion of the sprue from the tip of the high-temperature stopper for opening and closing the sprue, and pouring into the mold by the stopper inserted into the sprue A pouring process 6 for controlling, a product cooling process 7 for cooling the product, a frame separating process 8 for separating the upper frame and the lower frame, and a product extracting process 9 for taking out the product from the frame.
Consists of. After taking out the product, the upper and lower frames are returned to the molding process, and the sand is regenerated and used in the molding process.

FIG. 2 is a plan view showing an outline of the casting line. In the lower mold making machine 11 provided in two rows, the lower mold (sand mold) has a cold box inside the lower frame (back metal frame). As long as the lower mold is not defective, the core is manually stored in the lower mold being conveyed by the core diaper line 12 and the upper mold making machine 13 provided in two rows An upper mold (sand mold) is molded inside the frame (back metal frame) by the cold box method, and the upper frame and the lower frame conveyed by the core diaper line 12 are aligned with each other by a frame aligning device 14
The integrated upper and lower frames are
It is conveyed to the heat-resistant seal member insertion device 16 by the conveying line 15, the presence or absence of the core is detected by the core detection mechanism 32, and the heat-resistant seal member insertion mechanism 33 is used only when the core is present. A ring-shaped heat-resistant seal member S (FIG. 6) is inserted into the sprue, and the molten metal is poured into the mold by the pouring device 17. Further, this mold is conveyed to a frame separating device 19 via a product cooling line 18, the lower frame separated here is conveyed to the lower mold making machine 11 via a product take-out line 20, and the upper frame is conveyed via a line 21. It is conveyed to the upper molding machine 13.

FIGS. 3 and 4 show the heat-resistant seal 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 this heat-resistant seal member supply mechanism 31. Is provided on the left side of the mold 102a
Core detection mechanism for detecting the presence or absence of cores in the mold from the sprue
32, and a ring-shaped heat-resistant seal member S (FIG. 6) provided on the right side of the heat-resistant seal member supply mechanism 31 at the gate of the mold 102b.
And a heat-resistant seal member inserting mechanism 33 for inserting.

In the heat-resistant seal member supply mechanism 31, a drive unit 43 is driven by a motor 41 via a rotation transmission means 42 as shown in FIG.
The index table 44 is rotated by the index. Vertical guides 45 are erected on the index table 44 in eight sections at equal pitch intervals, and a large number of heat-resistant seal members are inserted and laminated in the 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 the index table 44 is 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 pull-out plate 47, and the heat-resistant seal members are horizontally pulled out by the pull-out plate 47 to a pickup position described later.

As shown in FIG. 3, the core detecting mechanism 32 is mounted on a fixed plate 51 located on the sprue of the mold 102a.
As shown in FIG. 4, an elevating cylinder 52 and an elevating guide 53 are attached, and a rod 55 is guided by the elevating guide 53 to the lower end of the operating rod 54 of the elevating cylinder 52 to be vertically moved. A lifting plate 56 is connected to the lifting plate 56, and a core detection rod 57 is provided on the lifting plate 56. The core detection rod 57 is inserted through a sprue opened on the upper surface of the upper frame for a predetermined stroke, and when the lower end of the core detection bar 57 comes into contact with the core,
The presence of the core is confirmed by ascending relative to the descending elevator plate 56 and operating a limit switch or the like (not shown).

As shown in FIG. 3, the heat-resistant seal member insertion mechanism 33 is provided with a transverse guide 62 along a frame 61, and a transverse plate 63 is movably attached to the transverse guide 62. Is moved between the pick-up position on the drawer plate 47 and the sprue position of the mold 102b by a cylinder (not shown), a feed screw, or the like. Further, as shown in FIG. 64
Is attached, and an insertion head 65 is vertically movable by the cylinder 64. A balloon-shaped chuck is attached to the insertion head 65.
66 and a heat-resistant seal member detection pawl 67 are provided.

Then, the heat-resistant seal member insertion mechanism 33
The insertion head 65 is lowered by the head lifting cylinder 64 on the pull-out plate 47, and the ring-shaped heat-resistant seal member S (FIG. 6) pulled out to the pickup position by the pull-out plate 47 is moved by the detection claw 67. When detected, the balloon-shaped chuck 66 is inserted into the inner hole h (FIG. 6) of the heat-resistant seal member S, the balloon-shaped chuck 66 is expanded with compressed air to hold the heat-resistant seal member S from the inside, and the head is moved up and down. This heat resistant seal member is pulled up by the cylinder 64 for
Further, the traverse plate 63 is moved along the guide 62 to transfer the heat resistant seal member to a position corresponding to the gate of the mold 102b and wait.

Next, the operation of the heat-resistant seal member inserting device 16 will be described.

When the mold 102a is carried into the lower side of the core detecting mechanism 32 and stopped, the lifting cylinder 56 lifts the lifting plate 56a.
Down, and insert the core detection rod 57 into the mold as shown in FIG.
It is inserted into the gate 104 of 102a, and the presence or absence of the core 106 is detected.
Unless the lower mold is defective in the core diaper line 12 (FIG. 2), the core 106 is manually put in the lower mold during transportation. Therefore, the core detection rod 57 confirms the presence of the core 106. If so, the mold 102a is determined to be a non-defective product.

When the core 106 is confirmed, when the mold 102b is carried into the lower side of the heat-resistant seal member insertion mechanism 33 and stopped, the insertion head 65 waiting on the spout is raised and lowered. The ring-shaped heat-resistant seal member S held by the expanded balloon-shaped chuck 66 that is lowered by the work cylinder 64 is inserted into the sprue 104 as shown in FIG. The balloon-shaped chuck 66 releases the internal air and contracts to release the chucking, rises by the cylinder 64, returns to the pickup position along the transverse guide 62, and picks up the next heat-resistant seal member S at this position. To do.

Next, FIG. 6 shows a main part of the pouring device 17. This pouring device 17 has a weir 71 for temporarily storing the molten metal supplied in a constant amount from a ladle (not shown) and pouring the molten metal into the mold 102.
Is fixedly placed in place. This hanging weir 71 is one in which an amorphous refractory material 73 is integrally provided inside the back metal 72, and a molten metal dropping nozzle 74 is provided in this hanging weir 71.
The melt drop port 75 provided in the melt drop nozzle 74 has a larger diameter than the stopper 101.

The stopper 101 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 that is vertically moved by a vertically moving cylinder (not shown). It is a graphite rod attached by a lower attachment plate 85 that is vertically movable.

In the mold 102, a sand mold 92 is provided by a cold box method inside a back metal frame 91 integrally formed with the outer frame 90. Generally, 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 and there is no need to heat the back metal frame 91 and the sand mold 92.
There are advantages that they are not deformed, energy is saved, the amount of sand used is reduced, sand for cold boxes is easily regenerated, and resources are saved.

The sand mold 92 is provided with a sand mold nozzle 103 which can freely come into contact with and separate from the molten metal dropping nozzle 74 of the latch weir 71. The sand mold nozzle 103 is provided with a sprue 104. A seat portion 105 is provided which normally engages with the stopper 101 inserted through the molten metal drop nozzle 74 of the weir 71.

The seat portion 10 formed at the opening of the gate 104
A ring-shaped heat-resistant seal member S that is engaged with the spherical surface 101a formed at the tip of the stopper 101 is inserted by the heat-resistant seal member insertion device 16 in FIG.

The heat-resistant seal member S is obtained by cutting a hollow ceramic fiber molded product (commercial name fiber sleeve) formed by suctioning and molding a ceramic fiber into a cylindrical shape, and the ceramic fiber molded product is heat-resistant. It has heat insulation, flexibility and elasticity.

Next, the operation of the pouring device shown in FIG. 6 will be described.

When the mold 102 whose core 106 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 102 is lifted by a mold lifting mechanism including a spring (not shown). Elastically pushing up, Kake weir 71
The mold sand mold nozzle 103 is brought into close contact with the molten metal dropping nozzle 74.

Further, the rod 81 is lowered by a vertical movement cylinder (not shown), and the stopper 101 is inserted into the sand mold nozzle 103 through the molten metal drop nozzle 74 of the hook weir 71 as shown by the two-dot chain line in FIG. , And this stopper 101
Is pressed against the heat-resistant seal member S previously inserted by the elastic pressing force accumulated in the compression coil spring 84, and the heat-resistant seal member S is attached to the seat portion 105 of the gate 104.
So that it closes the sprue 104.

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 101a at the tip of the stopper 101 are in close contact with each other over the entire circumference, and the heat-resistant seal member S is also formed. Since the outer peripheral edge of the lower part of the spigot and the seat portion 105 of the sprue 104 are in close contact with each other over the entire circumference, a high degree of sealing performance is maintained even if the load of the spring 84 applied to the stopper 101 is not so large.

In this sealing state, after a certain amount of molten metal is supplied to the latch weir 71 from a ladle (not shown), the stopper 101 is raised and pulled up from the inner hole h of the heat insulating member S, and the molten metal in the latch weir 71 is melted. From the molten metal drop port 75 of the drop nozzle 74, it is poured into the molten metal spout 104 in the sand type nozzle 103 in a close contact state. At this time, the heat-resistant seal member S does not float above the seat 105 of the sand nozzle 103 and narrow the opening of the gate 104 due to the buoyancy force received from the melt, so that the flow rate of the melt at the gate 104 is reduced by the heat-resistant seal member S. Therefore, all the molten metal in the hanging weir 71 is poured into the sand mold 92 in a short time (about 2 seconds) through the gate 104.

The stopper 101 was heated by the high temperature molten metal (about 1400 ° C.) at the time of the previous pouring, and has a high temperature of 800 ° C. or more. Further, the stopper 101 is lowered and the ladle 71 is lifted from the ladle. Since it takes as long as 10 seconds to supply the molten metal to the sand in a fixed amount, if the high temperature stopper 101 is directly pressed against the sand type seat portion 105 for 10 seconds, the seat portion 105 may collapse due to thermal deterioration. The heat resistant seal member S
The high temperature stopper 101 causes the sand nozzle 103 to sit on the seat 105.
Since there is no direct contact with, it is possible to prevent such a fear.

In this way, when the pouring of one mold is completed, the mold 102 is lowered onto a conveyor (not shown) and carried out from the pouring position. The heat-resistant seal member S is made disposable by pouring once.

When it was confirmed by the core detection rod 57 of the heat-resistant seal member insertion device 16 that the core 106 was not present, the operator judged that the mold was defective and did not intentionally hold the core. Therefore, the heat-resistant seal member S is automatically controlled so that neither the heat-resistant sealing member S is inserted nor the molten metal is poured into the mold without the core, and the mold 102 is allowed to pass under the weir 71 without stopping.

[0035]

According to the invention as set forth in claim 1, there is a core sizing step in which the core is stored only in a mold in a good condition and the core is not stored in a mold in a defective condition, depending on the molding state. Insert the core detection rod from the gate of the mold in front of the hot water to detect the presence or absence of the core, and perform pouring into the mold with the core and pouring into the mold without core. Since it comprises a pouring step in which the hot water is stopped, it is not necessary to pour the mold when the molding is not preferable, and waste of molten metal and pouring time can be prevented.

According to the second aspect of the invention, the seat of the sprue is protected from the high temperature stopper only when the presence of the core is confirmed between the core detecting step and the pouring step. Since the heat-resistant seal member insertion step of inserting the heat-resistant seal member into the gate is included, wasteful insertion of the heat-resistant seal member for defective molding can be prevented.

[Brief description of drawings]

FIG. 1 is a flowchart showing a casting method of the present invention.

FIG. 2 is a plan view showing an outline of a casting line according to the same casting method.

FIG. 3 is a plan view of the heat-resistant seal member insertion device provided in the above casting line.

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

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

FIG. 6 is a sectional view showing a main part of a pouring device provided in the casting line.

FIG. 7 is a plan view showing an outline of a general casting line.

[Explanation of symbols]

 1 Molding process 2 Core diaper process 4 Core detection process 5 Heat resistant seal member insertion process 6 Pouring process 57 Core detection rod 71 Lock weir 101 Stopper 104 Gate 105 Seat 106 Core S Heat resistant seal member

Claims (2)

[Claims] 1. A casting method comprising at least a step of molding a mold in a frame, a step of storing a core in the mold, and a step of pouring molten metal into the mold. Inserting a core detection rod to insert the core detection rod from the mold's spout before pouring, and to detect the presence or absence of the core A casting method comprising a step and a pouring step of pouring the molten metal into a mold with a core and suspending the pouring into the mold without the core. 2. A step of molding a mold in a frame, a step of storing a core in the mold, and a stopper inserted into a gate of a mold which penetrates the latch weir and is closely attached to the latch weir into the mold. In the casting method having at least the step of controlling the pouring, the core is placed in only the mold in good condition and the core in the mold in bad condition, and the casting process before pouring is performed. Insert a core detection rod from the gate of the mold to detect the presence or absence of the core, and only when the presence of the core is confirmed in this core detection step,
A heat-resistant seal member inserting step of inserting a heat-resistant seal member for engaging the tip of the stopper to protect the seat part of the sprue from a high-temperature stopper, and pouring into a mold with a core, A casting method comprising a pouring step of suspending pouring into a mold without a core.