JPH0440106B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for taking out a casting, and in particular, a method for separating and recovering main sand and sand grains forming a core, which have different properties when taking out a casting. Regarding how it was done.

(Prior Art) Conventionally, when casting, for example, a cylinder block for an engine, the casting was taken out from the mold after the molten metal had solidified in the following manner. That is,
First, as shown in Fig. 1, an upper frame 1 is filled with main mold sand 2 to form an upper mold, a lower frame 3 is also filled with main mold sand 2, and molten metal is poured into a sprue 4 to form a lower mold. Blocks 5, 5 are formed facing the boundary between the upper mold and the lower mold, and the molten metal is solidified. The cavity of the cylinder block 5 is filled with core sand 6. When the solidification of the molten metal is completed, the pressing parts A to D around the sprue 4 on the upper surface of the upper mold are pressed and held using clamps, etc., and in this state, a lifting claw is attached to the protrusion 7 protruding from the side surface of the upper frame 1. The upper frame 1 is locked and pulled upward to separate the upper frame 1. When the upper frame 1 is separated, the main mold sand 2 in the upper mold remains on the lower frame 3 as shown in FIG.
A cylinder block 5 and core sand 6 are housed therein. Next, the take-out device 8 shown in FIG. 3 is moved over the mold. This take-out device 8 has a cylinder block 5.
With the gripping claws 9 open, the take-out device 8 is lowered so that the gripping claws 9 can grip the cylinder block 5, and then the gripping claws 9 are operated. Grip the cylinder block 5 inside the main mold sand 2. With the gripping claw 9 gripping the cylinder block 5, the extraction device 8
As shown in FIG. 4, the gripping claws 9 dig into the main mold sand 2, grip the cylinder block 5, and release the lower frame together with the sprue 4, the core sand 6, and the main mold sand 2 adhering to the surroundings. 3 and transported onto a pedestal for the next process.

The conventional extraction method described above has the following problems.

First, in order to remove the cylinder block 5, the core sand 6 in the cylinder block 5, and the main mold sand 2 attached around the cylinder block 5 together from the lower frame 3, the next step is sand removal and sand regeneration process. In this case, the main mold sand 2 and the core sand 6, which have different properties, are mixed, and it is difficult to separate and recover the main mold sand 2 and the core sand 6 and to maintain the properties of the recycled sand well.
For this reason, it was not possible to prevent the properties of the reclaimed sand from deteriorating, resulting in a decrease in quality due to poor casting of the cylinder block 5.

In addition, the gripping claws 9 of the take-out device 8 grip the cylinder block 5 by biting into the firmly molded main mold sand 2 attached around the cylinder block 5, so the gripping claws 9 are severely damaged and worn. The gripping claws 9 had to be replaced frequently.

Furthermore, the main mold sand 2 taken out with the cylinder block 5 will be placed on the pedestal for the next process, and the operation of the equipment must be temporarily stopped to remove the sand on the pedestal. This was increasing the number of equipment stoppage factors.

Furthermore, in Japanese Patent Application Laid-open No. 52-21221, there is a method in which the flask is removed and the cast product is clamped and fixed with a sprue etc. in a sand mold, and pressed from the outside to fold and break the mold. However, the core sand cannot be separated and recovered sufficiently.

(Objective of the Invention) The object of the present invention is to take out the casting after solidification of the molten metal from the mold without main mold sand attached to the casting, and to form a core in the casting with the main mold sand. The object of the present invention is to provide a method for taking out castings that can separate and recover sand grains.

(Structure of the Invention) In order to achieve the above object, the present invention is structured as follows. That is, the molten metal is poured from the main mold sand side of the upper mold into a mold that has upper and lower molds with main mold sand inside and a core formed of sand grains, and after the molten metal has solidified, the casting is removed from the mold. While the upper surface of the sprue of the casting solidified in the mold is pressed and held from above by a presser member, the upper mold having the main mold sand is separated from the lower mold to expose the upper part of the casting to the upper part of the lower mold, Thereafter, the upper part of the casting is grasped and the casting is taken out from the lower mold with the core housed therein. Therefore, since the casting is taken out with the main sand of the upper and lower molds removed, the sand grains forming the core and the main sand can be separated and recovered, and the exposed casting is directly gripped, so the gripping claws This can prevent the main mold from being damaged or worn out by sand damage. Furthermore, in the case of the present invention, when the upper mold is separated from the lower mold, the upper surface of the sprue of the casting solidified in the mold is pressed and held from above by the holding member, so that misalignment of the casting is prevented. Later, when an automatic machine grips the upper part of the casting and removes it from the lower mold, the casting can be gripped and removed reliably.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 5 to 7. In the drawings, the same reference numerals as in FIGS. 1 to 4 indicate the same or corresponding parts.

Figure 5 is a process diagram showing how to take out the castings.
First, in the upper frame separation step 10, the sprue portion on the surface of the upper mold is held and the upper frame is separated together with the main mold sand, leaving the upper part of the casting exposed on the upper surface of the lower mold. and,
The exposed casting is removed from the lower mold in a casting removal step 11.

These upper frame separation process 10 and casting removal process 1
1, as shown in FIGS. 6 and 7, first the sprue 4
The cylinder block 5 is held by pressing the pressing parts E and F of the upper frame 1, and in this state, the lifting claw is engaged with the protrusion 7 of the upper frame 1, and the upper frame 1 is lifted upward.
and are separated from the lower mold and cylinder block 5. At this time, the main mold sand 2 in the upper frame 1 is firmly attached to the upper frame 1, and the cylinder block 5 is held under pressure by the pressing parts E and F, so the main mold sand 2 is peeled off from the surface of the cylinder block 5. It is removed after adhering to the upper frame 1.

Then, as shown in FIG. 7, the upper half of the cylinder block 5 and the sprue 4 are exposed on the lower mold, and the exposed cylinder block 5 is grasped with the gripping claws and pulled out upward from the lower mold. Core sand 6
The cylinder block 5 is taken out with the cylinder block 5 housed inside.

The upper frame separation step 10 described above proceeds to an upper frame sand removal step 12, as shown in FIG. 5, in which the main mold sand 22 adhering to the upper frame 1 is removed. In addition, the casting removal process 1
1 proceeds to a core sand removal process 13 and a lower frame sand removal process 14. In this core sand process 13, the core sand 6 in the cylinder block 5 taken out from the lower mold is dropped from the cylinder block 5, and the core sand 6 from the cylinder block 5 is recycled in the core sand regeneration process 15. Reused. In the lower frame sand removal step 14, the main mold sand 2 remaining in the lower frame 3 is removed,
In the main mold sand regeneration step 16, the main mold sand 2 from the upper frame sand removal step 12 and the main mold sand 2 from the lower frame sand removal step 14 are recycled and reused.

An apparatus for carrying out each of the above steps will be explained with reference to FIGS. 8 to 11. 8 and 9 are diagrams showing the upper frame separation device used in the upper frame separation step 10, and 17 in FIG. 8 is a frame fixed on the floor surface 18. A conveyor table 19 is installed in the lower part of the frame 17 from the back side of the page to the front side of the paper, and the mold 21 is placed on the conveyor table 19 via rollers 20 and is conveyed. ing. The frame body 17 has a sprue 4 for the mold 21.
A holding mechanism 22 that presses and holds the upper frame 1 and a lifting mechanism 23 that locks and lifts the upper frame 1 upward are provided.

The holding mechanism 22 includes a pressing clamp 24 and a mounting member 2.
5, a guide rod 26, and a pressing cylinder 27.As shown in FIG. 9, two holding mechanisms 22 are provided and are arranged so as to press and hold the pressing parts E and F of the sprue 4. The pressing clamp 24 is attached to the lower surface of the mounting member 25, and the two guide rods 26 and the rod 28 of the pressing cylinder 27 are connected to the upper surface of the mounting member 25. The guide rod 26 is slidably provided through the frame 17, and slides as the pressing cylinder 27 expands and contracts, thereby moving the joining member 25 up and down.

The lifting mechanism 23 also includes a lifting claw 29, a mounting member 30, a guide rod 31, and a locking cylinder 3.
2. It is formed from a lifting cylinder 33. The mounting member 30 is a rectangular frame that covers the mold 21, to which each of the above-mentioned members is attached and through which the pressing clamp 24 passes. Guide rods 31 are attached to the four corners of the upper surface of this mounting member 30, and rods 34 of a lifting cylinder 33 are attached to the center of the upper surface, and as the cylinder 33 expands and contracts, the guide rods 34 slide and are attached. The member 30 is moved up and down. Further, a locking cylinder 32 is installed laterally on the upper surface side of the mounting member 30. Furthermore, a lifting claw 29 that engages with the protrusion 7 of the upper frame 1 is attached to the lower surface of the mounting member 30 and is supported by a shaft 35 . Two lifting claws 29 are installed facing each other, and the two lifting claws 29 are attached to the link 36.
are connected. The right lifting claw 29 is provided with an arm 37 that passes through the mounting member 30 and is connected to the rod of the locking cylinder 32.
Lifting 29 by the expansion and contraction movement of the locking cylinder 32
is rotated to lock the lifting claw 29 to the protrusion 7. Such a locking cylinder 3
2. Two sets of lifting claws 29 and the like are installed so as to be engaged with projections 7 projected on both sides of the upper frame 1.

The mold from which the upper frame 1 has been removed together with the main mold sand 2 by the upper frame separation device described above is conveyed on a conveyor table 19 to a casting removal station shown in FIG. This casting removal station has a transport platform 19.
A movable take-out device is installed on a rail 38 that is disposed in a direction perpendicular to .
This take-out device consists of a main body 39, a mounting member 40, a special cylinder 41, and a gripping mechanism 42. The main body 39 has wheels 43 attached to its lower surface.
On the upper surface side, a rod 44 of a lifting cylinder 41 passes through the main body 39 and is connected to a mounting member 40.
The mounting member 40 is guided by a guide rod 45 and is moved up and down by the expansion and contraction of the cylinder 41.

The gripping mechanism 42 includes a gripping cylinder 46 and a gripping claw 47, and the gripping cylinder 46 is connected to the mounting member 40.
It is installed horizontally on the top side of the Gripping claw 4
7 is pivotally supported by a shaft 48 on the lower surface side of the mounting member 40, and the arm 49 of the gripping claw 47 is connected to the cylinder 46.
The gripping claws 47 are connected to the rod of the cylinder 46 and rotated by the expansion and contraction movement of the cylinder 46, and grip the cylinder block 5 exposed on the lower frame 3. When the lifting cylinder 41 is shortened while holding the cylinder block 5, the mounting member 40 rises together with the holding mechanism 42 and the cylinder block 5, and the cylinder block 5 is taken out from the lower frame 3.

Next, the cylinder block 5 is taken out and the main mold sand 2 is removed.
The lower frame 3 with remaining sand is transported to a lower frame sand removal station. As shown in FIG. 11, a punch-out machine is installed at this lower frame sand removal station. This punch-out machine consists of a frame 50, an extrusion cylinder 51, and an extrusion die 52.
The lower frame 3 is conveyed into the interior of the container.
An extrusion cylinder 51 is attached to the frame 50, and an extrusion die 52 is attached to the tip of the rod 53 of the cylinder 51. This extrusion die 52 is shaped to be fitted into the lower frame 3 and extrudes the main mold sand 2 adhering to the inner surface of the lower frame 3 downward. Incidentally, a similar punch-out machine is also used to remove sand in the upper frame sand removal step 12 and core sand removal step 13.

The above embodiment has the following effects. First, as shown in FIG. 7, the cylinder block 5 is taken out from the lower frame 3 in a state where it is exposed on the lower frame 3, so the main mold sand is peeled off from the outer surface of the cylinder block 5, and the cylinder block 5 has no core. It is taken out with only the sand 6 attached. Therefore, in the next steps 12 and 14 for removing the upper and lower frames and removing the core sand 13, the main mold sand 2 and the core sand 6, which have different properties, are not mixed, and both are ensured. It can be separated and recovered.

Moreover, since the gripping claws 47 of the take-out device shown in FIG. 10 grip the cylinder block 5 exposed after the main mold sand 2 has been removed, it is prevented from being damaged or worn out by the main mold sand 2 as in the conventional case, and the gripping claws 47 The life of the claw 47 can be extended.

Furthermore, the cylinder block 5 from which the core sand 6 has been removed is transported to the next process, the chiseling process.
The cylinder block 5 is placed on the pedestal in this chiseling process. At this time, since the main mold sand 2 is not attached to the surface of the cylinder block 5, the main mold sand 2 is prevented from falling and accumulating on the pedestal.
Therefore, there is no need to stop the operation of the equipment in order to remove the main mold sand 2 on the pedestal, and the factors that cause the equipment to stop can be reduced.

Note that the present invention is not limited to the above embodiment. For example, the core is not limited to being formed by a sand mold, but may also be formed by a molding method using sand grains such as a shell molding method.

(Effects of the Invention) As explained above, according to the present invention, the casting having a core formed of sand grains is taken out of the mold in a state where no main mold sand is attached to the casting, and the main mold sand and the core are separated. Since the formed sand grains can be separated and recovered, problems such as quality deterioration when recycling main mold sand and core sand, severe damage and wear of the gripping claws, etc.
It is possible to effectively prevent problems such as a large amount of main mold sand being placed on the pedestal in the next process. Also,
In the case of the present invention, when the upper mold is separated from the lower mold, the upper surface of the sprue of the solidified casting in the mold is pressed and held from above by the holding member, so that misalignment of the casting is prevented, and later. When an automatic machine grips the upper part of the casting and takes it out from the lower mold, there is an advantage that the casting can be gripped and taken out reliably.

[Brief explanation of drawings]

Figures 1 to 4 are perspective views of a mold, respectively, illustrating the next step in the conventional extraction method, Figures 5 to 7 are diagrams showing an embodiment of the present invention, and Figure 5 is a process diagram; Figures 6 and 7 show upper frame separation step 1.
0, a perspective view illustrating the casting removal process 11, FIGS. 8 and 9 are views showing the upper frame separation device, FIG. 8 is a front view, FIG. 9 is a cross-sectional view of FIG.
0 is a front view of the take-out device, and FIG. 11 is a front view of the punch-out machine. 1...Top frame, 2...Main mold sand → Upper mold, 3...Bottom frame, 2...
Main mold sand→lower mold, 4...gate, 5...cylinder block→casting, 6...core sand→core, 24...pressing clamp→pressing member, 42...gripping mechanism.

Claims (1)

[Claims] 1. A method in which molten metal is poured from the main mold sand side of the upper mold into a mold equipped with upper and lower molds having main mold sand inside and a core formed of sand grains, and after the molten metal has solidified, the casting is removed from the mold. Then, with the upper surface of the sprue part of the casting solidified in the mold being pressed and held from above by a pressing member, the upper mold having the main mold sand is separated from the lower mold to expose the upper part of the casting to the upper part of the lower mold, and then A method for taking out a casting, the method comprising: afterwards, gripping the upper part of the casting and removing the casting from the lower mold with the core housed therein.