JPS63268556A - Production of casting - Google Patents

Abstract

PURPOSE:To stably take out a casting from a mold by forming a cradle at mutually common position in the gating system in each mold in accordance with kind of casting and taking out the casting from the mold as making the cradle as the reference. CONSTITUTION:Each cavity 15-17 of product part joining mold with the other mold 10 at the parting plane 11 and assembling cores 12-14, runner 3 and gate 5, is formed and the cradle cavity 18 is formed at the position corresponding to the cradles 7, 8 in the runner cavity 16. That is, in the case of constituting so as to show the cavity 16A of the gating system for the casting of large size by a solid line and the same cavity 16a for the casting with small size by a two dotted chain line, the cradle cavities 18A, 18B, 18a, 18b are formed at the common position of the gating system whether the casting is large or small. Then, lower end part of a main core 12 is held as linear to the mold 10 by extending to lower part of the runner cavity 16 and molten metal leakage to the boundary part between the mold 10 and the main core, forms casting fin as projecting downward from inside edge of the runner 3. By this method, the casting is taken out from the mold 10 by regarding the cradles 7, 8 as the reference without any interference of the casting fin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a casting in the field of casting using a frameless vertical mold.

(Prior art) Casting using a frameless vertical mold has been developed because it is possible to perform molding, pouring, taking out the casting, removing the casting plan, etc. in a continuous line. It is progressing.

Therefore, in order to take out the casting in such casting, a pair of take-out claws that open vertically from the front in the feeding direction of the mold are inserted into the upper and lower positions of the casting in the mold at the end of the feeding line of the poured mold. , a method has been proposed in which this casting is held from above and below with take-out claws and taken out forward in the feeding direction (for example, in Tokusho 60-11536
(See Publication No. 2). In this method, when the runner is arranged below the product part of the casting, the lower one of the pair of extraction claws holds the lower surface of the runner.

(Problem to be Solved by the Invention) By the way, in a frameless vertical mold, the cavity of the runner at the bottom of the product is between the core placed on the vertically divided surface side and the main mold surrounding the core. Due to the relationship formed, there is a boundary area under the runner cavity where the core and the main mold are in direct contact, and a part of the molten metal flows from the runner cavity to the boundary area and splits into the runner. Cast burrs may be formed that protrude downward along the surface. Therefore, when taking out a casting, as in the conventional proposal, if the casting is held from above and below with take-out claws, the presence or absence of the above-mentioned cast burrs or the amount of protrusion will vary depending on the individual castings, so it is difficult to take out the casting. There is a problem in that the posture of the casting is not constant, making it difficult to mechanically position the casting at that station in the next step after removal.

On the other hand, even when casting multiple types of castings of different sizes using frameless vertically split molds, in addition to the above-mentioned cast burr condition, the height from the runner to the runner and the amount of lateral overhang of the runner etc. are different for each type of casting, so when performing mixed flow production of castings, there is a problem that the casting removal means must be replaced every time the type of casting changes. The present invention
This is an attempt to solve the problem of removing castings in such mixed flow production.

(Means for Solving the Problems) The method for producing a casting of the present invention is such that when casting a plurality of types of castings with different sizes in a frameless vertically divided mold, each casting is made of hot water in each mold according to the type of casting. Configuring the pipe system so that a catch for receiving the casting is formed at a mutually common position, pouring the molten metal into the mold, and taking out the casting from the mold using the catch as a base after the molten metal solidifies. It is characterized by

(Function) In the case of the above casting manufacturing method, since a catch is formed in the runner system, the B product can be taken out from the mold at the catch without causing interference with casting burrs. Furthermore, even if the sizes of the castings are different, since the runners of the runner systems of the respective castings are in the same position, the castings can be taken out from the molds using the same casting removal means.

(5F, light effect) Therefore, according to the present invention, the runner system of each mold according to the type of casting is configured so that the catch is formed at a common position, and this catch is used as the base. Since the castings are taken out from the molds in a mixed flow production mode, the castings can be taken out stably without having a switching or stage change function on the casting removal means side.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of a casting 1.

This casting l is placed under a product part 2 as a cylinder block material of the engine and runs along the periphery of this product part 2 into a runner 3.
are arranged in a substantially U-shape, and the sprue 4 extends from the center of the U-shape of the runner 3 and stands upright. Also,
The weirs 5 are provided at six locations around the periphery of the product section 2, and
A raised plate 6 is provided on the upper surface of the plate. Seats 7 and 8 for supporting the casting 1 are provided at four locations in total, including both ends and two corners of the runner 3.

FIG. 2 shows a simple vertically split mold structure for casting the above-mentioned casting l. In the figure, 11 is a cut surface of an adjacent mold (main mold) 10.10, and between both molds 10.10, a main core 12.1 that mainly forms the inner surface of the product part 2. Jacket core 1 forming the water jacket
A product cavity 15, a runner cavity 16, and a weir cavity 17 are formed by arranging the main core 14 into which the upper end of the main core 12 is inserted. A catch cavity 18 is formed in the runner cavity 16 at a position corresponding to the above-mentioned catch 7.8 by recessing the cavity surface of the mold 10 laterally. In this mold structure, the lower end of the main core 12 extends below the runner cavity 16 and is held directly in the mold lO, and extends from the runner cavity 16 to the boundary where the mold 10 and the main core 12 contact each other. As the molten metal leaks out, cast burrs 19 that protrude downward from the inner edge of the runner 3 are generated.

Therefore, as shown in FIG. 3, the cavity 16A of the runner system of a large-sized casting is shown by a solid line, and the same cavity 16a of a small-sized casting is shown by a two-dot chain line, the mold IO is adapted to the size of the casting to be cast. Regardless, catch cavities 18A and 18B are located at a common location in the runner system.

18a and 18b are formed. In other words, catch cavity 1
8A, 18B, 18a, and 18b have both outer edges in the direction along the cut surface 11 and both outer edges in the direction orthogonal to the cut surface 11 at the same position.

FIGS. 4 and 5 show a line configuration from taking out the casting 1 cast in the frameless vertically split mold 10 to cooling and conveying it.

In the same figure, 21 is a mold conveyor that pours and conveys a series of vertically split molds 10, and this mold conveyor 21
Following the casting take-out station 22 at the conveyance end, stations 23 to 25 are provided in order for sprue folding, sand removal, and loading onto a conveyor 26 for cooling and conveyance. A frame 27 is provided extending from above the mold conveyor 21 to the cooling conveyor 26 at the take-out station, and the castings are placed on rails 28 on this frame 27.
A removal means 30 and a transfer means 31 for transferring the casting l from the sprue folding station 23 to the loading station 25 via the sand removal station 24 are provided so as to be able to reciprocate synchronously by a cylinder device 32.

In other words, the take-out means 30 and the transfer means 31 each have a trolley 35 on which rollers 33 and 34 are supported on the rails 28.
．． 36, and a rack portion of a rod 37 extending from the transfer means 31 is engaged with a pinion 39 rotated by a motor 38 of the take-out means 30. A rod 32a of a cylinder device 32 supported by a bracket 40 on the frame 27 in front of the transfer means 31 is connected to a truck 35 of the transfer means 30. As a result, the cylinder device 3
As the rod 32a of No. 2 moves forward and backward, the take-out means 30 and the transfer means 31 move in synchronization, and the interval between the take-out means 3o and the transfer means 3 can be adjusted by rotation of the motor 38. .

Therefore, the above-mentioned take-out means 30 includes a lifting platform 44 which is suspended from the trolley 35 so as to be able to rise and fall using a lifting cylinder device 41 and guide rods 43, 43 inserted into guide tubes 42, 42.
Equipped with. As shown in FIG. 6, a pair of opposing take-out arms 45 and 46 are supported on both sides of this lifting table 44 so that they can be opened and closed by opening and closing cylinder devices 47 and 48, respectively, in the direction along the split surface 11 of the mold IO. has been done. Further, the lower surface of the lifting table 44 contacts the side wall of the detection hole 49 provided in advance on the upper surface of the mold 10, so that the split surface 11
A split surface sensor 5o is provided to detect the position of the motor 38, and controls the drive of the motor 38.

That is, the above-mentioned take-out arms 45, 46 are as shown in FIGS. 7 and 8.
As shown in the figure, two extraction claws 45a are arranged in parallel.
, 45 a, 46 a, 46 a.

It is inserted from the side of the split surface 11 of the mold 10 into the portion of the runner 3 where flash 19 is not generated, that is, under the seats 7, 7, 8.8. Then, when the motor 38 is stopped at the position where the split surface sensor 50 detects the split surface 11, the respective take-out claws 45a and 46a move from the receiving seat 7 of the runner 3.
, 8 will be located right next to the position. In FIG. 8, what is shown by a chain line is the runner 3a in a small-sized casting, and the catch is in the same position as in the large-sized one.

On the other hand, the transfer means 31 each have a lifting cylinder device 5.
2.53 and a guide rod 56.57 which is centered by guide rollers 54.55 of eight upper and lower hands. The first elevating table 58 has the above-mentioned take-out claw 45a.
, 46a, and a pair of second clamp arms 61, 61 that open and close in the direction perpendicular to the opening and closing direction of the extraction claws 45a, 46a, and a pair of second clamp arms 61, 61 that open and close in the same direction as the extraction claws 45a, 46a. 62 and 62 are respectively openably and closably supported by opening/closing cylinder devices 63 and 64, one of the extraction claws 45a and 46a and the second clamp arm 62 and 62 is connected to the runner 3.
The first clamp arm 61 receives a catch 7.7 at both ends of the runner, and the other one receives a catch 8.8 at a corner of the runner 3.
One of the runners 61 receives the end seat 7 and corner seat 8 on one side of the runner 3, and the other receives the end seat 7 and corner seat 8 on the other side. .

At the sprue folding station 23, the casting 1 is placed on the catch plate 7 of the runner 3.
．． The sand removal station 24 is provided with a fixed receiver 65, 65 for receiving the casting l at the receivers 7, 8, and a roller type movable receiver 66, 68 for receiving the casting l at the receivers 7, 8. Regarding the position of the catches on the catch seat 7.8, the take-out claws 45a, 46a, the first and second clamp arms 61
, 62 are the outer parts 7a, 8 of the seats 7, 8 as shown in FIG.
a, the fixed receiver 65 and the movable receiver 66 are connected to the catch seat 7,
The inner parts 7b and 8b of 8 are received.

The sprue folding station 23 is provided with folding means (not shown) for clamping the casting 1 and striking the sprue 4 to break it, and the sand removing station rotates movable receivers 66 and 66 to vibrate the casting 1 and remove core sand. It is designed to be dropped.

In addition, the fixed receiver 65°65 and the movable receiver 66,66 both have their upper portions slanted outward and widened,
This inclined portion guides and supports the casting 1 to the receiving portion.

The loading station 25 includes a pallet transfer position 25a on the sand removal station 24 side and a cooling conveyor 2.
6 side loading position 25b. The pallet 6 on which the casting 1 is placed is placed in the pallet transfer position 25a.
A rotary table 68 on which 7 is placed is provided. This pallet 67 has four cast metal receivers 69 arranged symmetrically about the center, and two bins 70 and 7 at the end.
0 is provided protrudingly, and rollers 71 are provided on both sides. Then, the pallet 67 is placed on the rotary table 68.
Two rails 72, 72 are provided which movably support the roller 71.

The loading position 25b is at a position iW where the casting l is loaded together with the pallet 67 onto the cooling conveyor 26. That is, the cooling conveyor 26 is a hanger type,
The transport direction is perpendicular to the direction in which the casting l is transferred by the transfer means 31, and the opposing hangers 74 and 74 are connected to the rails 72 and 72 of the rotary table 68.
A book rail 75.75 is fixedly provided. Fixed rails 76 and 76 are provided at the back of the loading position 25b, and the rails 76 and 76 of the hanger 74 are
5.75 and the fixed rails 76.76, a cart 77 for exchanging pallets is provided so as to be reciprocally movable by a cylinder device 78 for exchanging pallets. Then, a pair of clamp arms 79 and 79 for clamping the pallet 67 in the bins 70 and 70 are attached to the cylinder device 80 on the second replacement cart 77.
It is installed so that it can be opened and closed. Therefore, pallet 67
is moved in and out between the hanger 74 and the rotary table 68 by operating the replacement cylinder device 78 while being clamped by the clamp arm 79. Note that a sand receiver 73 is provided below the hanger 74.

Next, a method of manufacturing the casting in the above embodiment will be explained.

First, cores 12 to 14 are assembled between molds 10 and 10 to form cavities 15 to 18. At this time, each mold 10 formed according to the type (size) of the casting l is arranged so that the catch cavity 18 of the runner system is in the same position. That is, as shown in FIG. 3, the outer edges of the seat cavities 18Δ, 18B and 18a, 18b are made to coincide with each other.

Then, the mold conveyor 21 sequentially pours molten metal into each of the molds 10, which are molded as described above and transported vertically without frame, and transported to the take-out station 22 in a solidified state. Actuation of the cylinder device 32 on 27 sends the removal means 3o to the removal station 22. Then, the elevating table 44 is lowered, the split surface sensor 50 is inserted into the detection hole 49 of the mold 10, and the motor 38 is driven until the split surface 11 is detected to position the take-out claws 45a, 46a.

Then, the cut surface 11 is attached to the opposing extraction claws 45a and 46a.
A closing operation is performed from the side in the direction along the split surface 11, and the take-out claws 45a, 46a are inserted into the outer parts 7a, 8a of the catch seat 7.8 where cast burrs 19 in the runner 3 are not generated. The casting 1 is placed and held on the seats 7 and 8, and the casting 1 is pulled upward or forward to be removed from the mold 10.

Since the extraction pawls 45a, 46a are inserted in the direction along the split surface 11 with respect to the receiving seat 7°8, even if there is cast burr 19 on the inner edge of the runner 3, the extraction pawls 45a, 46a are There is no interference with the burr 19, and even if the size of each type of casting l is different, especially the size of the product part 2 or the arrangement of the runner system), the positions of the seats 7 and 8 are the same. Therefore, the taking-out means 30 takes out each type of casting 1 from the same direction and at the same position using the same taking-out arm 45, 46.
In other words, it can be extracted using the same operation. Further, each type of casting 1 is removed from the take-out arm 45 by the receiving seats 7 and 8 which are located at the same position and where no cast member 19 is present in the take-out state.
．． 46, its take-out posture is always constant.

Each casting 1 taken out by the take-out claws 45a, 46a is sent to the sprue folding station 23,
b, 8b are supported by fixed receivers 65, 65. In this case, the positions of the receivers of the take-out claws 45a and 46a are different from those of the fixed receivers 65 and 65, so the positions of the receivers of the take-out claws 45a and 46a are different.
The transfer from 46a to fixed receiver 65.65 is smooth, and the supporting posture of each casting 1 with respect to fixed receiver 65.65 is stable without being affected by flash 19, and the same positioning state is achieved.

Next, the casting 1 is picked up from the sprue folding station 23 by the first clamp arm 61 and placed at the sand removal station 23.
Transfer it to the movable receiver 66 and drop the core sand. And the second
The casting 1 is picked up from the sand removal station 24 by a clamp arm 62 and placed on a pallet 67 on a rotary table 68.

The above-mentioned transfer of the castings 1 between the stations 22 to 25 for taking out, sprue folding, sand removal, and loading is carried out synchronously by the operation of the cylinder device 32 on the frame 27. Each time it is placed on 67, it will be rotated 90 degrees. When the four castings 1 are placed on the pallet 67, they are transferred to the hanger 74 by a replacement cylinder device 78 and cooled and transported. And the empty pallet 6 sent by the primary hanger 74
7 onto the rotary table 68, and the sand-removed casting l
receive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a casting;
Figure 2 is a cross-sectional view of the mold, Figure 3 is a cross-sectional view showing the cavity of the mold runner system, Figure 4 is a plan view of the casting processing system, Figure 5 is a side view of the system, and Figure 6. 7 is a partially sectional front view showing the relationship between the casting removal means and the mold;
The figure is a partially omitted cross-sectional view showing the relationship between the casting and the extraction claw.
FIG. 8 is a plan view showing the same relationship. l...casting, 3...runner, 7,8...
...Catch, 10...Mold, 11...
・Cross surface, 16.16A, 16a... Runway cavity, 18.18A, 18B. 18a, 18b... Seat cavity, 19...
...Casting burr, 21...Mold conveyor, 22
...Take-out station, 30...Take-out means, 31...Transfer means, 45.46...
...Take-out arm, 45a, 46a...Take-out claw. Patent Applicant Mazda Motor Corporation Agent 1) Kiyoshi Naka −
Figure 1

Claims (1)

[Claims] (1) When casting multiple types of castings of different sizes using frameless vertically split molds, the runner system of each mold according to the type of castings is placed at a common position to receive the castings. 1. A method for manufacturing a casting, comprising: pouring molten metal into the mold, and removing the casting from the mold with reference to the catch after the molten metal solidifies.