CN112139456A - An angled stepped inner runner for pouring multi-layer castings - Google Patents

Abstract

The invention discloses an angled stepped inner runner used for pouring multi-layer castings, and belongs to the technical field of casting. The front end of the sprue in the middle-layer sand box is bent downward at a certain angle, so that the front end becomes a lower inclined sprue. Only then can it enter its horizontal sprue, thereby entering the casting cavity; the front end of the sprue of the lower flask is bent upward at a certain angle, so that the front end becomes an upper inclined sprue, and the end of the upper sloping sprue is straight from it. The sprue is connected, and the molten iron flows directly down a certain distance along the inclined inner sprue, and then enters its horizontal sprue, thereby entering the casting cavity. The mold is filled layer by layer in the above order, and the upper casting cavity will not enter the molten iron in advance, so as to avoid the production of iron beans in it, prevent the interruption of flow, improve the filling efficiency and quality, and can fill the multi-layer castings and improve the casting quality.

Description

An angled stepped inner runner for pouring multi-layer castings

technical field

The invention relates to an angled stepped inner runner used for pouring multi-layer castings, and belongs to the technical field of casting.

Background technique

Multiple castings are placed in layers in the vertical direction. Using a set of pouring system can improve productivity, save site area, ensure casting quality, and control the cooling time of thin-walled parts. When pouring multi-layer castings, molten iron needs to start from the bottom casting and fill layer by layer from bottom to top.

The traditional sprue cannot guarantee bottom-up filling during multi-layer filling. The molten iron will enter from each sprue at the same time. If the flow rate is too low or the flow is cut off, especially in the initial casting process, the flow will be cut off in the cavity of the middle and upper castings, and a small amount of molten iron entering the cavity will be cooled in advance and become iron beans, making it difficult to guarantee the quality of the casting.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned deficiencies of the prior art, the present invention provides an angled stepped inner runner used for pouring multi-layer castings, which ensures that the multi-layer castings are filled one by one from bottom to top. Layer filling, during the filling process of the lower casting, the cavity of the upper casting will not enter the molten iron, so as to avoid the production of iron beans inside, to ensure the stable flow rate of the molten iron in the inner runner that is being filled, to prevent flow interruption, and to improve the filling efficiency. And quality, can fill multi-layer castings, improve casting quality and reduce production costs.

The technical scheme adopted by the present invention to solve the technical problem is as follows: an angled stepped inner runner used for pouring multi-layer castings, comprising an upper flask, a middle flask, a lower flask, a sprue, a runner, It is divided into sprue, inner runner and casting cavity. Several middle-layer flasks are stacked between the upper flask and the lower flask. The upper flask, the middle flask and the lower flask are fixed to each other into a rectangular body by bolts. The sand box is provided with a sprue, the bottom surface of the upper sand box is provided with a sprue that communicates with the sprue, the middle sand box is only provided with a pair of sprues that penetrate the upper and lower end faces, and the sprue of the middle sand box is divided into sprues. The sprue is connected up and down, the sprue of the uppermost middle-layer flask is connected with the sprue, and a pair of sprues are opened on the top of the lower flask. The inside of the flask is provided with an inner runner that communicates with its sub-sprue. The inner runner is a horizontal channel, and the end of the inner runner is communicated with the bottom end of the side wall of the casting cavity provided at the top of the middle-layer flask; There is an inner runner that communicates with the bottom end of the sub-sprue, the inner runner is a horizontal channel, and the end of the inner runner is connected with the bottom end of the side wall of the casting cavity provided at the top of the lower flask; The runner enters the sprue, enters the sprue from the runner, and enters the casting cavity through the sprue connected to the sidewall of the sprue to complete the filling. Bend a certain angle so that its front end becomes a downward sloping runner, and the end of the lower sloping runner is connected to its sub-sprue, and the molten iron can enter its horizontal runner only after it flows up a certain distance along the lower sloping runner. Then it enters the casting cavity; the front end of the sprue of the lower flask is bent upward at a certain angle, so that the front end becomes an upper inclined sprue. The sprue flows directly down a certain distance and then enters its horizontal sprue, thereby entering the casting cavity.

Further, the sum of the lateral distances between the lower inclined runner and its rear runner is the same as that of the traditional runner, and the sum of the lateral distances between the upper sloping runner and its rear runner is the same as that of the traditional runner. The distance between the runners is the same. When the molten iron fills the lower flask, it passes through the inclined inner runner. Under the action of gravity, the filling speed of the lower casting cavity can be further improved, and the rear-end horizontal runner can slow down. The impact force of the molten iron entering the casting cavity prevents the resin sand in the casting cavity from being swept away by force, and improves the casting molding effect.

Further, in the closed gating system and the semi-closed gating system, the angle between the lower sloping runner of the middle-layer flask and its sub-sprue is from large to small, that is, the slope of the molten iron in the downward sloping runner, from From the upper layer to the lower layer, it gradually becomes steeper to prevent the pressure flow state. When the lower layer is filled, the upper layer has molten iron entering the cavity to form a flow cutoff, iron beans, etc.

Further, in the open gating system and the closed-open gating system, the inclination angle of the lower sloping sprue of the middle-layer flask is consistent, and the angle between the lower sloping sprue of the layer flask and its sprue is 60°. Between ° and 88°, the molten iron needs to pass a slope of 2° to 30° if it wants to enter the casting cavity 8, because the open gating system and the closed-open gating system are divided into sprue and inner sprue. The runner is in a pressureless flow state, and the lower inclined inner runner mainly has the effect of preventing overflow, preventing the molten iron from entering the cavity in the upper layer when the lower layer is filled, resulting in interruption of flow, iron beans, etc.

The beneficial effects of the present invention are as follows: the problem that the traditional multi-layer filling is prone to flow interruption, iron beans and the like is solved, and the inner runner ensures that the multi-layer casting is filled layer by layer in the order from bottom to top during the filling process, During the filling process of the lower casting, the cavity of the upper casting will not enter the molten iron, so as to avoid the production of iron beans in it, to ensure the stable flow rate of the molten iron in the inner runner being filled, to prevent the interruption of flow, and to improve the filling efficiency and quality. Fill multi-layer castings, improve casting quality and reduce production costs.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of the main cross-sectional structure of the present invention.

FIG. 2 is a schematic side sectional view of the structure of the present invention.

3 is a top sectional view of the middle-layer flask of the present invention.

FIG. 4 is a schematic structural diagram of the present invention.

FIG. 5 is a schematic diagram of the structure of an ordinary multi-layer casting inner runner.

Labels in the figure:

1. Upper flask, 2. Middle flask, 3. Lower flask, 4. Sprue, 5. Sprue, 6. Sprue, 7. Inner sprue, 8. Casting cavity, 9 , Lower inclined inner runner, 10. Upper inclined inner runner.

Detailed ways

As shown in Figure 1-5, an angled stepped inner runner for pouring multi-layer castings includes an upper flask 1, a middle flask 2, a lower flask 3, a sprue 4, a runner 5, It is divided into sprue 6, inner runner 7 and casting cavity 8. There are several middle-layer flasks 2, upper flask 1, middle-layer flask 2 and lower flask 3 stacked between upper flask 1 and lower flask 3. They are fixed to each other into a rectangular body by bolts, the upper flask 1 is provided with a sprue 4, the bottom surface of the upper flask 1 is provided with a runner that communicates with the sprue 4, and the middle flask 2 is only provided with a pair of sprues through the upper and lower sides. The sub-sprue 6 on the end face, the sub-sprue 6 of the middle-layer flask 2 are connected up and down, the sub-sprue 6 of the uppermost middle-layer flask 2 is communicated with the runner 5, and the top of the lower flask 3 is provided with a pair of sub-sprues. The runner 6, the sub-sprue 6 is communicated with the sub-sprue 6 of the middle-layer flask 2, and the inner-sprue 7 communicated with the sub-sprue 6 is provided in the middle-layer flask 2, and the inner runner 7 is A horizontal channel, and the end of the inner runner 7 is connected with the bottom end of the side wall of the casting cavity 8 opened at the top of the middle-layer flask 2; the lower flask 3 is provided with an inner runner 7 that communicates with the bottom end of the sprue 6. , the inner runner 7 is a horizontal channel, and the end of the inner runner 7 is connected with the bottom end of the side wall of the casting cavity 8 provided at the top of the lower flask 3; the molten iron enters the runner 5 from the sprue 4, The runner 5 enters the sprue 6, and enters the casting cavity through the inner runner 7 connected to the side wall of the sprue 6 to complete the filling. Bend a certain angle, so that its front end becomes a lower inclined runner 9, and the end of the lower inclined runner 9 is connected with its sub-sprue 6, and the molten iron can enter its horizontal runner 9 after flowing up a certain distance along its lower inclined runner 9. The sprue 7 enters the casting cavity 8; the front end of the sprue 7 of the lower flask 3 is bent upwards at a certain angle, so that the front end becomes the upper inclined sprue 10, and the end of the upper sloping sprue 10 is separated from it. The sprue 6 is connected, and the molten iron flows down a certain distance along the inclined inner runner 10 and then enters the horizontal runner 7, thereby entering the casting cavity 8.

Further, the sum of the lateral distances between the lower inclined runner 9 and its rear runner 7 is the same as that of the traditional runner 7, and the lateral distance between the upper sloping runner 10 and its rear runner 7 is the same as that of the traditional runner 7. The sum of the distances is the same as that of the traditional runner 7. When the molten iron fills the lower flask 3, it passes through the sloping runner 10. Under the action of gravity, the filling speed of the lower casting cavity can be further improved. The rear-end horizontal inner runner 7 can slow down the impact force of the molten iron entering the casting cavity 8, prevent the resin sand in the casting cavity 8 from being swept away by strong scouring, and improve the casting molding effect.

Further, in the closed casting system and the semi-closed casting system, the angle between the lower inclined inner runner 9 of the middle layer flask 2 and its sub-sprue 6 is from large to small, that is, the molten iron is inclined downward in the inner runner 9. The slope of the upper layer gradually becomes steeper from the upper layer to the lower layer to prevent the situation of flow interruption and iron beans when the upper layer is filled with molten iron when the lower layer is filled.

Further, in the open gating system and the closed-open gating system, the inclination angle of the lower inclined runner 9 of the middle layer flask 2 is consistent, and the lower inclined runner 9 of the layer flask 2 is divided into the sprue 6. The included angle is between 60° and 88°. If the molten iron wants to enter the casting cavity 8, it needs to pass a slope of 2° to 30°, because the open gating system and the closed-open gating system are divided into two parts. Both the sprue 6 and the inner runner 9 are in a pressureless flow state, and the lower inclined inner runner 9 mainly plays an anti-overflow effect, preventing the molten iron from the upper layer from entering the cavity when the lower layer is filled to form a flow interruption and iron beans. and so on.

Claims (4)

1. A ladder ingate with angles for pouring multilayer castings comprises a cope flask (1), a middle-layer flask (2), a drag flask (3), a sprue (4), a cross runner (5), a branch sprue (6), an ingate (7) and a casting cavity (8), wherein a plurality of middle-layer flasks (2) are stacked between the cope flask (1) and the drag flask (3), the cope flask (1), the middle-layer flask (2) and the drag flask (3) are fixed into a rectangular body through bolts, the sprue (4) is arranged on the cope flask (1), the cross runner communicated with the sprue (4) is arranged on the bottom surface of the cope flask (1), only a pair of branch sprues (6) penetrating through the upper end surface and the lower end surface is arranged on the middle-layer flask (2), the branch sprues (6) of the middle-layer flask (2) are communicated up and down, the branch sprues (6) of the topmost middle-layer flask (2) are communicated with the cross runner (5), a pair of split sprues (6) are formed in the top of the lower sand box (3), the split sprues (6) are communicated with the split sprues (6) of the middle sand box (2), inner runners (7) communicated with the split sprues (6) are arranged in the middle sand box (2), the inner runners (7) are horizontal channels, and the end parts of the inner runners (7) are communicated with the bottom ends of the side walls of casting cavities (8) formed in the top end of the middle sand box (2); an ingate (7) communicated with the bottom end of the sub-sprue (6) is arranged in the drag flask (3), the ingate (7) is a horizontal channel, and the end part of the ingate (7) is communicated with the bottom end of the side wall of a casting cavity (8) formed in the top end of the drag flask (3); molten iron enters the cross gate (5) from the sprue (4), enters the branch sprue (6) from the cross gate (5), enters the casting cavity through the ingate (7) communicated with the side wall of the branch sprue (6), and completes the filling, and is characterized in that: the front end of an ingate (7) of the middle sand box (2) is bent downwards for a certain angle, so that the front end of the ingate becomes a lower inclined ingate (9), the end part of the lower inclined ingate (9) is communicated with a branch sprue (6), and molten iron can enter the horizontal ingate (7) after flowing upwards for a certain distance along the lower inclined ingate (9) so as to enter a casting cavity (8); the front end of an ingate (7) of the lower sand box (3) is bent upwards for a certain angle, so that the front end of the ingate is an upper inclined ingate (10), the end part of the upper inclined ingate (10) is communicated with a branch sprue (6), and molten iron directly flows downwards along the upper inclined ingate (10) for a certain distance and then enters the horizontal ingate (7) of the lower inclined ingate, so as to enter a casting cavity (8).

2. An angled stepped ingate for pouring a multi-layer casting according to claim 1, wherein: the sum of the transverse distances between the lower inclined ingate (9) and the ingate (7) at the rear end of the lower inclined ingate is the same as the distance between the traditional ingate (7), and the sum of the transverse distances between the upper inclined ingate (10) and the ingate (7) at the rear end of the lower inclined ingate is the same as the distance between the traditional ingate (7).

3. An angled stepped ingate for pouring a multi-layer casting according to claim 1, wherein: in a closed pouring system and a semi-closed pouring system, the included angle between a lower inclined ingate (9) of a middle sand box (2) and a branch sprue (6) thereof is gradually reduced.

4. An angled stepped ingate for pouring a multi-layer casting according to claim 1, wherein: in the open type pouring system and the closed-open type pouring system, the inclination angles of the lower inclined ingates (9) of the middle sand box (2) are consistent, and the included angle between the lower inclined ingates (9) of the middle sand box (2) and the branch straight pouring channel (6) is between 60 degrees and 88 degrees.

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