JPH0628798B2 - Method and device for removing cast product from mold - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for taking out a casting product from a mold, and more particularly, to a casting product which is cast in a split mold and placed on a mold surface of a lower mold thereof. Automatically take out the cast product that has been placed, and with each mold surface of the upper mold and the lower mold oriented upward, each process that sends out toward the polishing and cleaning process arranged on the downstream side is fully automatic. The present invention relates to a method and an apparatus for implementing the method.

2. Description of the Related Art Centrifugal casting method is widely adopted as one of the means for casting a dense cast product having few casting defects such as shrinkage cavities and blow holes. In this centrifugal casting method, the molten metal is poured into the mold while rotating the mold at a high speed, and the centrifugal force applied to the molten metal at the time of rotating the mold causes the molten metal to adhere to the inner wall surface of the mold in a layered manner such as a cast iron pipe or a ball valve. Suitable for casting hollow products.

For example, when the product to be cast is a ball valve, as shown in FIG. 5, a split mold 16 including a lower mold 12 and an upper mold 14 is mounted on a rotary table 10 which constitutes a part of a centrifugal casting machine. Then, the rotary table 10 is rotated about its vertical central axis. At the same time, the molten metal is poured into the cavity through the pouring port 18 formed at the top of the upper mold 14. Mold 1 at this time
The molten metal injected into the cavity serving as the mold surface of 6 (the inner surface is coated with a coating mold with a required thickness) is applied to the inner wall surface of the cavity by the centrifugal force of the mold 16 rotating together with the rotary table 10. Sticking, whereby a ball valve of the desired shape is cast as casting 20.

Problems to be Solved by the Invention As described above, the mold 16 that can be divided into the upper mold 14 and the lower mold 12 is used.
In order to take out the cast product 20 as a product after performing centrifugal casting using, the conventional procedure was as follows. That is, as shown in FIGS. 9 (a) and 9 (b), the hook 26 suspended from a transportation means such as an overhead crane is slid on the upper mold 14 and the upper mold 14 is lifted to rotate the turntable 10 Separate from the upper lower mold 12. The suspended upper mold 14 is horizontally held by inserting the pins 24, 24 into the reversing table 22 shown in FIG. 9 (c), and then 180
By reversing the mold surface 14a of the upper mold 14
Point (consisting of curved concave surfaces) upward.

Further, as shown in FIG. 9 (b), the lower mold 12 from which the upper mold 14 is separated has the casting 20 left in the mold surface 12a. Therefore, as shown in FIG. 9 (d), the casting 20 is lifted by the hook 26 from the overhead crane,
0 is transferred to the required stockyard. Further, the lower die 12 is hoisted by a crane with the casting surface 12a thereof facing upward, and is unloaded from the rotary table 10 and unloaded to a subsequent process. In this case, the upper mold 14
In both the lower mold 12 and the lower mold 12, the mold surfaces 14a and 12a are directed upward so that the coating mold or other core sand after collapse that remains adhered to the mold surface is removed by means such as sandblasting in a later step. This is for the convenience of (cleaning).

In any case, conventionally, in order to take out the cast product from the split mold used in the centrifugal casting method, only the upper mold is first separated and extracted from the mold on the rotary table, and this upper mold is the mold in the subsequent process. In order to carry out smooth surface cleaning, it is necessary to transfer to the reversing table, set it, and then invert it. In addition, the cast product placed on the mold surface of the lower mold is lifted by a means such as a crane and taken out, and then the empty lower mold is also lifted by a means such as a crane and transferred, which is troublesome and time-consuming. It is a bottleneck that reduces the casting efficiency.

OBJECT OF THE INVENTION The present invention relates to a split mold composed of an upper mold and a lower mold suitably used in a centrifugal casting method, and in view of various inherent problems as described above, it is proposed to solve the problems well. In order to take out the cast product from the split mold after centrifugal casting and to send it to the cleaning and sweeping process, all the work of converting the mold surface of each mold to the posture in which it is directed upward is performed manually. It is an object of the present invention to provide a method and an apparatus thereof that can be automatically performed without requiring.

Means for Solving Problems The above-mentioned problems are overcome, and in order to achieve the intended purpose, the casting product takeout method according to the present invention is a divided mold consisting of an upper mold and a lower mold, and the lower mold is The casting is placed on the mold surface and conveyed in an upward state, and the upper die is a step of continuously conveying the lower die with the mold surface facing downward, and the lower die in the course of the conveyance, by the hand. While gripping the lower mold, the process of discharging and ejecting the cast product by rotating the hand 180 ° at the cast product discharging position, and then reversing the hand 180 °, and then gripping the lower mold at the carry-out position. With respect to the process of releasing the upper mold and the upper mold that comes after the lower mold, a process of gripping the upper mold with a hand and rotating it by 180 °, and a process of releasing the grip on the upper mold at the carry-out position. It is characterized in that it is configured from.

Further, the casting product unloading apparatus preferably used for carrying out the method is a conveyer conveyor for carrying the mold toward the mold gripping position, a casting product unloading section located downstream thereof, and a casting product unloading unit downstream thereof. A trolley provided with a unloading conveyor provided at a unloading position, which is located above a die transfer path from the transfer conveyor to the unloading conveyor and is capable of horizontally reciprocating motion; and a trolley suspended from the trolley and vertically movable. It is characterized in that it is composed of a support member and a pair of hands which are supported by the lower end portion of the support member in such a manner as to be capable of normal rotation and reverse rotation within a rotation angle range of 180 ° and grip and release the mold.

Example Next, a method for taking out a cast product from a mold according to the present invention will be described below in relation to an apparatus for suitably implementing the method. FIG. 1 is a front view showing a schematic configuration of a casting product take-out device according to an embodiment, and a reference numeral 28 in the drawing shows a carry-in conveyor for carrying a mold 16 toward a mold gripping position A. . The carry-in conveyor 28 is preferably configured as a roller conveyor and is mechanically separated into two sections, indicated by the symbols X and Y in the figure. And each carry-in conveyor 28
The a and 28b are chain-driven by the illustrated speed reducers 30 and 32, so that the transport and stop can be controlled independently.

At a predetermined position on the downstream side of the carry-in conveyor 28, a casting product take-out section 34 composed of a box-shaped collection container having an open upper surface is arranged, and a lower mold forming a split mold 16 as described later is provided in the container 34. The casting 20 from 12 is to be released. The position where the cast product take-out portion 34 is disposed is indicated as "cast product release position B".

Further, a carry-out conveyor 36 is arranged at a mold carry-out position C located on the downstream side of the “cast product discharging position B”.
The carry-out conveyor 36 is configured as, for example, a roller conveyor forming a part of an automatic blasting / cleaning line (not shown) for blasting the mold surface of a mold, and is chain-driven by a reducer (not shown). ing.

A carriage 38 is arranged above a series of mold conveying paths constituted by the carry-in conveyor 28, the cast product take-out section 34, and the carry-out conveyor 36, and can be horizontally reciprocated. That is, as shown in FIGS. 1 to 3, two columns in each row are provided on both sides of the mold conveyance path with the mold conveyance path interposed therebetween.
0, 42 (4 in total) are erected at appropriate intervals, and beam members 44 are horizontally bridged (2 in total) on the tops of the columns 40, 42 in each row. A rail 46 is laid on the upper surface. As shown in FIG. 3, on a rail 46, 46 laid in parallel, a carriage 38 made of a rectangular frame is mounted via wheels 48. This dolly 38 has a speed reducer 50 in which wheels 48 are arranged on the dolly.
Is driven by the chain so that it can reciprocate horizontally within a range regulated by stoppers 52 provided near both ends of the rails 46, 46.

A rectangular opening 38a is defined in the center of the carriage 38,
The two guide members 54, 54 are arranged upright with the opening 38a sandwiched therebetween, and a prismatic support member 56 is supported between the guide members 54, 54 so as to be able to move up and down, and the lower end portion thereof is provided with the beam. It is suspended vertically below the members 44,44. As shown in FIG. 1, the support member 56 has a long rack 58 disposed and fixed on one side surface thereof.
Engages with a pinion gear 62 connected to a speed reducer 60 arranged on the carriage 38. By controlling the speed reducer 60 in the normal and reverse directions, the support member 56 can be stably moved vertically with respect to the carriage 38 by a required stroke while being guided by the guide members 54, 54. There is.

At the lower end of the support member 56 (which faces the space defined between the beam members 44, 44 and the four columns 40, 42), a shaped arm 64 is formed at the center thereof. Fixed in. Both arm portions 64a of this arm 64,
64b includes a hand 6 for gripping and releasing the mold.
Nos. 6 and 68 are supported, respectively, and can be rotated forward and backward within a rotation angle range of 180 °. For example, as shown in FIG. 4, a bearing is provided at each end of both arm portions 64a and 64b of the mold arm 64, and a hollow rotary shaft 70,
70 is rotatably supported with its center lines aligned. A fluid pressure cylinder 72, which is operated by hydraulic pressure or air pressure, is horizontally installed at the outer end of each rotary shaft 70, and a piston rod 74 of the cylinder 72 is inserted into the hollow portion of the rotary shaft 70. The two arms of the arm 64 face each other. This piston rod 74,
Hands 66 and 68 of the illustrated shape are respectively fixed to the respective ends of 74, and both hands 66 and 68 are connected to the fluid pressure cylinder 7
The molds 16 (the upper mold 14 and the lower mold 12) can be grasped and released by being brought close to and away from each other under the action of the synchronous urging of 2,72.

A sprocket 76 is fixed to each rotary shaft 70, and a speed reducer 78 fixed at a required position of the arm 64.
Sprockets 82, 82 are respectively fixed to both ends of the output shaft 80 branched from. The chain 84 stretched between the sprocket 76 and the corresponding sprocket 82.
Are driven by the speed reducer 78, so that the respective rotation shafts 70 can rotate in synchronization with the arms 64. The rotation angle of the rotary shaft 70 in this case is set within an angle range of 180 ° above the horizontal plane, and the normal rotation and the reverse rotation can be performed within the range.

Reference numeral 86 in the figure is fixed to the rotary shafts 70, 70 in both arm portions of the arm 64, and is integrally formed with the rotary shafts 70 and 70.
4 shows a yoke member rotating within an angular range of 0 °.

When the movement of the hands 66 and 68 themselves is observed in the apparatus according to the present invention configured as described above, it has the following degrees of freedom.

By traveling the carriage 38 on the rail, it is possible to reciprocate in the section of the mold gripping position A → the casting product discharging position B → the unloading position C.

By raising and lowering the support member 56 vertically with respect to the carriage 38, the hands 66, 68 can also be raised and lowered within predetermined upper and lower limit levels.

By rotating the rotating shafts 70, 70, the hands 66, 68
As shown in FIGS. 7 (d) and 7 (e), can be rotated normally and reversely within an angle range of 180 °.

The hands 66 and 68 can approach and separate from each other under the urging action of the cylinders 72 and 72 to grip and release the mold 16.

Operation of the Embodiment Next, the operation of sequentially performing the method according to the present invention by using the casting product take-out apparatus having the above-described structure will be described. The mold 1 is placed on the carry-in conveyor 28 of the casting product take-out device shown in FIG.
Prior to the transfer of No. 6, the following die extraction work is executed. That is, as shown in FIG. 5, the split mold 16 composed of the upper mold 14 and the lower mold 12 after centrifugal casting is lifted upward from the rotary table 10 by the crane while the cast product 20 is cast inside. And is transferred to the carry-in conveyor 28 shown in FIG. On the carry-in conveyor 28, the upper mold 14 is divided from the lower mold 12, and the upper mold 14 is placed behind the lower mold 12 (rear with respect to the transport direction).
Next, the carry-in conveyor 28 is operated and the mold gripping position A
The transportation toward is started. At this time, the lower die 12 is conveyed in an upward state in which the casting 20 is placed on the mold surface 12a, and subsequently to the lower die 12, the upper die 14 makes the mold surface 14a face downward (lay down). It will be transported in the state.

(Conveying Lower Mold) As described above, the lower mold 12 and the upper mold 14 are
It is conveyed on the carry-in conveyor 28 in the form shown in the figure. When the lower die 12 (where the casting 20 is placed and the mold surface 12a is directed upward) arrives just below the die gripping position A shown in FIG. And the like, and the conveyance of the carry-in conveyor 28a located in the section indicated by the symbol X is stopped. Further, the carry-in conveyor 28b in the section indicated by the symbol Y also stops, so that the upper mold 14 with the mold surface 14a facing downward stops at a position upstream of the lower mold 12 by a required distance. At this time, the hands 66 and 68 located at the die gripping position A are located at the ascending limit thereof, and are separated from each other relatively to the die 1
It is in a state of waiting for the grip of No. 6.

In this state, as shown in FIG. 7 (b), the support member 56 suspended from the carriage 38 vertically descends under the meshing action of the rack 58 and the pinion gear 62, and stops at the mold gripping position A. To the position where the lower mold 12 is
Both hands 66 and 68 come. Next, a pair of left and right cylinders 72, 72 shown in FIG.
As a result of the piston rods 74 and 74 extending,
The both hands 66 and 68 reach the lower mold 12.
Then, as shown in FIG. 7 (c), the support member 56 is attached to the carriage 3
Both hands 66, 68 by raising to 8
Raise the lower mold 12 gripped by to the required level,
Next, the carriage 38 is moved forward horizontally on the rails to move both hands 66, 68 and the lower die 12 to the casting product discharging position B (see FIG. 7 (d)).

At the casting discharge position B, the speed reducer 7 shown in FIG.
8 is urged, and by its chain and sprocket drive, both rotary shafts 70 aligned in both arms of the arm 64,
Rotate 70 counterclockwise 180 °. As a result, the mold surface 12a of the lower mold 12 is reversed by 180 °, and FIG. 7 (e)
As shown in Fig. 2, the mold surface 1 is directed downward.
The casting 20 is dropped and discharged from 2a. The casting 20 is
It is collected in the casting product take-out section 34 disposed below the casting. When the discharge of the cast product 20 is completed, as shown in FIG. 7 (f), both hands 66 and 68 are reversed clockwise by 180 ° under the reverse urging action of the speed reducer 78, and the above-mentioned downward movement is performed. The mold surface 12a of the mold 12 is directed upward again.

Next, the carriage 38 advances from the casting product discharge position B toward the casting product carry-out position C further downstream thereof, and the carry-out position C
And lowering the support member 56, the both hands 6
The lower die 12 gripped by 6, 68 is stably placed on the carry-out conveyor 36. Further, the cylinders 72, 72 are reversely biased to relatively separate the hands 66, 68 from each other, thereby releasing the grip on the lower die 12 (FIG. 7).
(g) to FIG. 7 (h)).

Further, as shown in FIG. 7 (i), after raising the support member 56 (and the hands 66, 68), the carriage 38 is moved to the position shown in FIG.
By retreating toward the mold gripping position A shown in (a), the removal of the cast product 20 from the lower mold 12 and the delivery of the lower mold 12 with the mold surface 12a oriented upward are completed. .

(Unloading of Upper Mold) The lower mold 12 conveyed on the carry-in conveyor 28 prior to the upper mold 14 has the casting product 20 recovered at the casting product discharge position B, and then the casting mold surface 12a is moved upward at the unloading position C. It was carried out in an oriented posture. In this case, the lower mold 1
When 2 is gripped by the hands 66 and 68 and lifted up, as shown in FIG. 1 and FIG.
・ The carry-in conveyors 28a and 28b installed in the section indicated by Y
And the upper mold 14 is conveyed to a position right below the mold gripping position A with the mold surface 14a lying down, and then stopped to wait for gripping by the hand. When the carriage 38 reaches the mold gripping position A again as shown in FIG. 8 (a) after the lower mold 12 has been carried out, the support member 56 is vertically lowered as shown in FIG. 8 (b). Then, the open hands 66, 68 are positioned on both sides of the upper mold 14. Next, by urging the cylinders 72, 72 shown in FIG. 4, the upper mold 14 is securely gripped, and the support member 56 is further raised to a required level (see FIG. 8 (c)).

After that, the carriage 38 is moved forward from the mold gripping position A toward the casting product discharge position B, the carriage 38 is stopped at this position B, and the speed reducer 78 is driven.
The hands 66, 68 and the upper mold 14 gripped by them are rotated 180 ° in the counterclockwise direction (FIGS. 8 (d) to 8).
(See (e)). Therefore, at this time, the upper mold 14 is converted into a posture in which the mold surface 14a is directed upward.

Then, as shown in FIG. 8 (f), the carriage 38 is moved to the carry-out position C.
The support member 56 is lowered at the carry-out position C, and the gripping of the upper mold 14 by both hands 66 and 68 is released (see FIG. 8 (g)). As a result, the upper mold 14 is transferred onto the carry-out conveyor 36, and the operation of the conveyor 36 causes the upper mold 14 to move.
Is sent toward the automatic cleaning line in a posture in which the mold surface 14a is directed upward. Further, as shown in FIG. 8 (h), the support member 56 is raised, and the hands 66, 68 are reversed by 180 ° in the clockwise direction to return. By further moving the carriage 38 backward, the carriage 38 returns to the original position shown in FIG. 7 (a). As a result, the casting product 20 can be taken out of the lower mold 12, the lower mold 12 can be carried out with the mold surface 12a oriented upward, and the upper mold 14 can be carried out with the mold surface 14a oriented upward. A series of cycles is achieved.

EFFECTS OF THE INVENTION As described in detail above, according to the casting product takeout method and apparatus according to the present invention, when taking out a cast product from the upper and lower molds used in centrifugal casting, the lower mold is gripped with a hand to obtain a required level. It is possible to drop and discharge the cast product from the mold surface of the lower mold by its own weight by raising the temperature to 180 ° and rotating it by 180 ° at the discharge position. Further, since the lower die after discharging the cast product has its mold surface oriented downward, it is rotated again in the opposite direction by 180 ° so that the mold surface is oriented upward and then carried out. Polishing of the mold surface by blasting is extremely easy.

The upper mold removed from the lower mold is conveyed in a lying state with the mold surface oriented downward.
By rotating 0 °, the mold surface can be directed upward. Therefore, the polishing of the mold surface by blasting in the subsequent process can be performed very easily.

According to the present invention, all of the above steps can be carried out fully automatically and continuously, so that the efficiency and labor saving of the removal of cast products and the reversal work of the upper and lower dies, which were conventionally processed with a great deal of human intervention, can be achieved. As a result, the production efficiency during centrifugal casting is remarkably improved.

[Brief description of drawings]

1 to 4 show a preferred embodiment of an apparatus for suitably carrying out the casting product takeout method according to the present invention.
FIG. 1 is a front view showing a schematic configuration of a casting product take-out apparatus according to an embodiment, FIG. 2 is a right side view of the apparatus shown in FIG. 1, and FIG. 3 is a cart used for the apparatus shown in FIG. FIG. 4 is a perspective view showing a schematic configuration of a gripping mechanism and a rotating mechanism of a pair of hands used in the apparatus according to the present invention. Prior to this, an explanatory view showing a state immediately before the metal mold including the upper mold and the lower mold and the cast product cast in the mold are integrally lifted and transferred to the carry-in conveyor, The figure is an explanatory view showing a state in which the upper die is removed from the die placed on the carry-in conveyor, and the upper die is placed on the rear side in the conveying direction of the lower die, FIGS. 7 (a) to 7 (i). ) Rotates the lower mold by 180 ° at the required position, drops the cast product from the lower mold and releases it. With performing teeth, the lower die 1
FIG. 8 is a schematic view showing each step stepwise by reversing by 80 ° and carrying out the mold surface with the mold surface directed upward, FIG.
(a) to FIG. 8 (i) are schematic diagrams showing stepwise each step of rotating the upper mold by 180 ° at a required position and carrying out the mold with its mold surface oriented upward, Figure (a) -9th
FIG. (E) is a schematic diagram showing stepwise separation and reversal of the upper mold from the split mold and removal of the cast product from the lower mold according to the prior art. 12 ...... Lower mold, 12a ...... Mold surface 14 ...... Upper mold, 14a ...... Mold surface 16 ...... Dividing dies, 20 ...... Casting product 28 ...... Conveying conveyor, 34 ...... Casting product unloading section 36 ...... Carry-out conveyor, 38 ... carriage 56 ... support member, 64 ... arm 66 ... hand, 68 ... hand 70 ... rotating shaft, 72 ... cylinder 74 ... piston rod

Claims (5)

[Claims] 1. A divided die consisting of an upper die and a lower die, wherein the lower die conveys a casting product on a mold surface in an upward state, and the upper die conveys the die surface in a downward direction. During the process of conveying the lower die and the lower die in the course of the conveyance, the lower die is gripped by a hand, and the hand is rotated by 180 ° at the casting product ejection position to eject and eject the casting product. And the step of releasing the grip on the lower mold at the carry-out position after reversing the hand by 180 °, and regarding the upper mold that comes after the lower mold, grip the upper mold with the hand. And a process of rotating the mold by 180 ° and a process of releasing the grip on the upper mold at the carry-out position. 2. A transport conveyor for transporting a mold to a mold gripping position, a casting product take-out section located downstream thereof, and a carry-out conveyor provided at a carry-out position downstream thereof, A carriage that is horizontally reciprocally located above the mold conveyance path from the conveyance conveyor to the unloading conveyor, a support member that is suspended from this carriage and hangs up and down, and a 180-mm lower end portion of the support member. A device for taking out a cast product from a mold, comprising a pair of hands that are supported so as to be able to rotate in the normal and reverse directions within a rotation angle range of ° and hold and release the mold. 3. A device for taking out a cast product from a mold according to claim 2, wherein the mold is a divided mold composed of a lower mold and an upper mold. 4. The removal of the cast product from the mold according to claim 2 or 3, wherein the lower mold is conveyed on a conveyor with the cast product placed on the mold surface of the lower mold. apparatus. 5. The method according to any one of claims 2 to 4, wherein the upper mold is conveyed on a conveyor after the lower mold with the mold surface thereof facing downward. A device for taking out castings from the mold.