JPH09225584A - Stack mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the temp. of molten metal in the whole zone of cavities by flowing the molten metal from secondary sprues to the product cavities into the second sprue of a core at the uppermost step and supplying the molten metal through dropping sprues bored in this surrounding. SOLUTION: The molten metal flowed into a primary sprue 2 is flowed into the secondary sprue 4 at the center part of the secondary sprue core 3 from the lower end thereof and pushed up and flowed to the upper part of the core 3. Since the upper step core 3a has the secondary dropping sprues 8a, 8b, 8c, 9d opened to runners 7a, 7b, 7c, 7d communicated with product cavities 6a, 6b, 6c, 6d in molds 5a, 5b, 5c, 5d at the upper step, second step, third step and fourth step, the molten metal in a riser is flowed into each of the product cavities 6a-6d through the dropping sprues 8a-8d. The molten metal is flowed into a waste molten metal opening cavity 11 through each of the flow-out runners 10 from flow-out hole of each product cavity 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated mold having a sprue system mechanism capable of maintaining a fixed amount of molten metal and a continuous flow thereof.

[0002]

2. Description of the Related Art Generally, a casting technique for castings is to sequentially solidify a plurality of mold cavities for a product such that the molten metal reaching the first cavity is in a flow-stopped state and then the second cavity is filled with the molten metal. Then, the temperature difference of the molten metal in the product cavity is large and a directional solidification process is usually performed. Among the casting materials of cast iron, spheroidal graphite cast iron has the characteristic of porridge-like simultaneous solidification morphology, and by reducing the temperature difference in the cavity area up to the solidification point of the molten metal after filling the cavity, a sound high quality casting can be obtained. Low cost can be obtained without hot water. It is also advantageous for casting that requires compounding. On the other hand, in the conventional casting technology, the gating system, which forcibly flows the quantitative molten metal in the cavity to make the molten metal temperature uniform, is advantageous in obtaining high quality castings. The constant time flow of is attractive for lowering the cost of the product.

[0003]

As described above, the gating system for uniformizing the molten metal temperature by forcibly flowing a fixed amount of molten metal in the cavity has many advantages in casting production, but It has not previously been applied to laminated molds.

Therefore, it is an object of the present invention to provide a laminated mold for a gating system by developing a technique for injecting the same amount of molten metal into the upper and lower stages of the laminated mold at the same time.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a molten metal spout, a molten metal inflow port and an outlet at the final arrival point of a product cavity, an upper mold cavity or the uppermost stage. By connecting to the molten metal cavity and making the temperature of the entire cavity of the molten metal uniform or keeping it continuously flowing, it is possible to maintain a constant flow and continuous flow into the mold cavity of each stage. Adopt technical means.

According to the present invention, a plurality of casting molds having a primary sprue, a secondary sprue made of a core, a product cavity for receiving molten metal from the secondary sprue, and an outflow rod communicating with the product cavity through an outlet are laminated. Then, there is provided a laminated mold characterized in that the molten metal from the secondary spout to the product cavity is supplied to the secondary spout of the uppermost core and is supplied through a drop spout provided around the secondary spout.

Further, the present invention relates to a primary spout, a secondary spout which is opened to the primary spout by an inflow weir and is made of a core, and a product cavity which is opened to the secondary sprue through an outflow of the core, A mold having an outflow rod and a cooling core leading to the product cavity is stacked at least two steps up and down, and the molten metal filling the product cavity through the primary and secondary gates of the lower mold causes the outflow rod and the cooling core to flow. A laminated mold is provided which can be injected into the product cavity of the mold thereabove.

Specifically, according to the present invention, according to the purpose of commercializing the target casting, (1) one-way continuous flow by constant flow rate inflow into each stage mold cavity in the laminated mold, and (2)
The present invention relates to a laminated mold having a sprue system that gives a continuous flow to each of the forward and reverse continuous flows due to a constant flow rate inflow into each stage mold cavity in the laminated mold until the molten metal is completely poured and completed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated mold 1 according to a first embodiment of the present invention will be described with reference to FIGS. The outline of the illustrated example will be described first. The molten metal that has entered the primary sprue 2 enters the secondary spout 4 at the center of the secondary spout core 3 from the lower end thereof and is pushed up to come to the upper part of the core 3. The upper core 3a includes the upper, second, third, and fourth molds 5a, 5
b, 5c, 5d product cavities 6a, 6b, 6c, 6
Since the secondary passage gates 8a, 8b, 8c, 8d open to the runners 7a, 7b, 7c, 7d leading to the d are provided, the feeder passes through these dropping gates 8a, 8b, 8c, 8d and each product Enter the cavities 6a, 6b, 6c, 6d. The molten metal enters the waste metal open cavity 11 from the outflow port 9 of each product cavity 6 through each outflow rod 10.

The mold of each stage will be described. Upper mold 5
a is a primary gate 2a leading to the molten metal injection cavity 12
It has an upper core 3a parallel to it, a runner 7a, a product cavity 6a, an outflow rod 10a and a waste hot metal open cavity 11. The upper core 3a has a secondary spout 4a in the center and drop spouts 8a, 8b, 8c, 8d around it, and only one drop spout 8a communicates with the runner 7a.

Cores 3c and 3d arranged in the second and third-stage molds 5b and 5c have central secondary gates 4b and 4c and drop gates 8b, 8c and 8d, among which the drop gates are provided. 8b communicates with the runner 7b, and the falling spout 8c communicates with the runner 7c. The molds 5b and 5c are further provided with primary gates 2b and 2
c, product cavities 6b, 6c, outflow bars 10b, 10c
Has. The fourth-stage mold 5d consists of a primary sprue 2d and a core 3
d, a runner 7d, a product cavity 6d, and an outflow rod 10d. The core 3d has a falling spout 8d leading to the runner 7d and a secondary spout 4d at the center.

The lowermost mold 5e has a runner 13 for connecting the primary and secondary gates 2 and 4 and a half of the product cavity 6d. The runners 7a, 7b, 7c, 7d have the same shape, and the cross-sectional areas of the drop gates 8a, 8b, 8c, 8d and the weir connecting the drop gates and the runners are the product cavities 6a, 6
The size shall not be filled with the molten metal until it is poured into b, 6c, and 6d. The difference in the pouring time to each mold due to the stacking height is small, and a fixed amount of molten metal can be quickly and reliably flowed into the product cavities at each stage.

The flow of the molten metal poured into the injection port 12 has already been described and will be omitted. Next, a second embodiment will be described with reference to FIGS. 7 and 8. The laminated mold 21 is the primary gate 2
2. Core 23 arranged in parallel with this, runner 27 leading to the outflow of core 23, product cavity 2 leading to runner 27
6, outflow rod 3 leading to the outlet 29 of the product cavity 26
0, mold 25 with cooling core 31 above the outflow rod 30
Are laminated. The molten metal from the inlet 32 enters the central gate 24d of the secondary gate 24 from the inlet of the lower core 23d of the core 23 from the primary gate 22 and enters the runner 27d from the outlet. Next, the molten metal fills the lower product cavity 26d and flows into the product cavity 26c above it through the outflow rod 30d and the cooling core 31d. When the head of the molten metal reaches the outlet of the core 23c, the new molten metal from the secondary molten metal spout 24c flows into the product cavity 24c. At this time, the molten metal near the cooling core 31d solidifies,
Since the communication between the outflow port 29d and the outflow port 29c is closed, the new molten metal enters the product cavity 26b above it through the outflow rod 30c and the cooling core 31c in such a manner as to flow backward in the product cavity 26c. . By performing such forward and reverse continuous flow of the molten metal, in this example, the product cavities 26d, 26c, 26b and 26a are sequentially filled from the lower side to the upper side. That is, the forward and reverse continuous flow of the molten metal is performed by reciprocating the flow corresponding to twice the volume of the product cavity in the product cavity.

The mold structure of each stage will be described. The upper mold 25a has an inlet 32, a primary gate 22a, an upper core 23a having a secondary gate 24a in the center, a runner 27a, a product cavity 26a, a molten metal outlet 29a, an outflow rod 30a, and a waste metal cavity 33. You The secondary sprue 24a is opened to the primary sprue 22a via the inflow weir, and is also opened to the runner 27a via the outflow weir. The second-stage, third-stage, and fourth-stage molds 25b, 25c, and 25d have the same shape, and each has a primary gate 22b, 22c, 22d, a secondary gate 24b, 24c,
Cores 23b, 23c, 23d having 24d, runner 27
b, 27c, 27d, product cavities 26b, 26c,
26d, outlets 29b, 29c, 29d, outflow rod 30
b, 30c, 30d, cooling cores 31b, 31c, 31d
Has. The secondary taps 24b, 24c and 24d are connected to the primary taps 22b, 22c and 22d and the runner 27 through the inflow and outflow.
It is opened to b, 27c, and 27d. The outlet 29b is the upper outlet 2 through the outlet rod 30b and the cooling core 31b.
9a, the outlet 29c is an outlet rod 30c, a cooling core 31c.
To the upper outlet 29b, and also the outlet 29d.
Can communicate with the outlet 29c above the outlet rod 30d and the cooling core 31d, respectively.

The lowermost mold 25e is the fourth mold 25e.
It has a half of the product cavity 26d of d. 34 shows a secondary outflow rod.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated mold of an example of the present invention.

FIG. 2 is a plan view of the example of FIG.

FIG. 3 is a sectional view of an upper core.

FIG. 4 is a cross-sectional view of a second stage core.

FIG. 5 is a cross-sectional view of a third stage core.

FIG. 6 is a sectional view of a fourth-stage core.

FIG. 7 is a sectional view of a second embodiment of the present invention.

8 is a plan view of the example of FIG. 7. FIG.

[Explanation of symbols]

 2,22 Primary sprue 3,23 Core 4,24 Secondary sprue 5,25 Mold 6,26 Product cavity 7,27 Spout 8 Drop spout 10, 30, 34 Outflow rod 31 Cooling core

Claims (4)

[Claims] 1. A plurality of molds having a primary sprue, a secondary sprue made of a core, a product cavity for receiving molten metal from the secondary sprue, and an outflow rod communicating with the product cavity through an outlet are laminated, A laminated mold characterized in that the molten metal from the secondary spout to the product cavity is supplied to the secondary spout of the uppermost core and is supplied through a drop spout provided around the secondary spout. 2. The core disposed in the intermediate mold has a dropping spout for supplying the molten metal to its product cavity, and another dropping spout extending to the core below the mold. Item 1. The laminated mold according to item 1. 3. A primary sprue, a secondary spout opened to the primary sprue through an inflow weir and made by a core, a product cavity opened to the secondary sprue via an outflow of the core, and a product cavity. A mold having an outflow rod and a cooling core is laminated in at least two stages up and down, and the primary gate of the mold below,
A laminated mold in which the molten metal filling the product cavity through the secondary gate can be injected into the product cavity of the mold above through the outflow rod and the cooling core. 4. The laminated mold according to claim 3, wherein the new molten metal can be supplied into the product cavity filled with the molten metal from the secondary molten metal spout.