A ductile iron casting structure with steady flow and slag blocking function and its working method

Abstract

The present invention discloses a flow-stabilizing and slag-blocking ductile iron casting structure and a working method thereof, wherein a first baffle is provided at the connection between a main transverse runner and a longitudinal runner, the first baffle comprising a head and a neck, the head being in a U-shape with an opening on one side, the top of the head being higher than the bottom of the main transverse runner, the neck extending from the head to the longitudinal runner, a first separator being provided between the head and the neck, the first separator separating the U-shaped opening into a plurality of first small feed ports, thereby effectively preventing slag from flowing in, delaying the dispersion time of molten metal, and improving the yield rate of the product.

Description

Technical Field

[0001] The invention relates to the technical field of casting processing and manufacturing, in particular to a slag-stabilizing flow-blocking ductile iron pouring structure and a working method thereof. Background Art

[0002] The pouring system is the channel for the molten iron to flow into the mold cavity. It usually consists of a pouring cup, a horizontal runner, a vertical runner, an inner gate, a part sand mold and other units. The molten iron enters the horizontal runner and the vertical runner from the pouring cup, and then enters the part sand mold. After cooling, a casting is formed.

[0003] However, the existing casting methods often have the following two problems:

[0004] Due to the presence of slag inclusions in the molten iron, the slag inclusions may enter the sand mold during the pouring process, causing defects in the formed product and resulting in poor product quality.

[0005] The molten iron poured into the pouring cup is quickly dispersed into the horizontal runner, vertical runner, inner gate, and part sand mold. The molten iron is very dispersed. Therefore, in the early stage of pouring, it is easy to cause the temperature of the local molten iron to drop rapidly, thereby affecting the quality of the casting. Even if the pouring time requirements are very strict, defective products are easy to appear. Summary of the invention

[0006] The invention provides a ductile iron pouring structure with a steady flow and slag blocking function and a working method thereof, which can not only effectively prevent slag from flowing in, but also delay the dispersion time of molten metal and improve the yield rate of products.

[0007] A ductile iron pouring structure with steady flow and slag blocking comprises a pouring cup, a main cross runner, a part cross runner and a longitudinal runner, the pouring cup is provided with a pouring port, the main cross runner is connected to the pouring cup, the main cross runner is connected to the part cross runner through the longitudinal runner, the part cross runner is connected to the casting sand mold, a first baffle is provided at the connection between the main cross runner and the longitudinal runner, the first baffle comprises a head and a neck, the head is U-shaped with an opening on one side, the top of the head is higher than the bottom of the main cross runner, the neck extends from the head to the longitudinal runner, a first separator is provided between the head and the neck, the first separator divides the U-shaped opening into a plurality of first small feed ports, a second baffle is provided between the longitudinal runner and the part cross runner, the second baffle is arranged in the part cross runner, the second baffle is provided with a plurality of second separators and divides the part cross runner into a plurality of second small feed ports.

[0008] Furthermore, the first partition sheet extends from the bottom of the U-shaped head toward the upper opening.

[0009] Furthermore, the neck is provided with a third separator, and the third separator is staggered with the first separator.

[0010] Furthermore, the cross-sectional area of ​​the single second small feed opening is smaller than the cross-sectional area of ​​the single first small feed opening.

[0011] A working method using the above casting structure is characterized by comprising the following steps:

[0012] A. Pour the molten metal through the pouring cup;

[0013] B. The molten metal accumulates in the main runner and gradually raises the liquid level. The tension of the molten metal prevents the molten metal from passing through the first small feed port or forms an intermittent and slow liquid flow channel;

[0014] C. The molten metal gradually fills the main runner, the pressure of the molten metal increases, the first baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the main runner to the longitudinal runner;

[0015] D. The molten metal accumulates in the longitudinal runner and gradually increases in liquid level. After the liquid level exceeds the second baffle, the tension of the molten metal prevents the molten metal from passing through the second small feed port or forms an intermittent and slow liquid flow channel;

[0016] F. The molten metal gradually fills the longitudinal runner, the pressure of the molten metal increases, the second baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the longitudinal runner into the casting sand mold;

[0017] G. After the molten metal fills the casting sand mold, the corresponding casting can be obtained after cooling.

[0018] Furthermore, the pouring time of step A is 10s.

[0019] Furthermore, in step B and step C, the first small feed opening blocks slag inclusions from entering and passing through.

[0020] The technical solution of the present invention has the following technical effects:

[0021] By providing a U-shaped baffle and a separator on the U-shaped baffle, slag inclusions in the molten metal cannot pass through the first small feed opening, thereby preventing the slag inclusions from subsequently entering the casting and causing defects, thereby improving the product yield.

[0022] The U-shaped baffle is divided into multiple first small feed ports. Since the molten metal has a certain viscosity, when the molten metal is less, although the height of the molten metal is higher than the first small feed port, the gravity of the molten metal cannot overcome the tension of the molten metal itself, so the molten metal cannot pass through the first small feed port. As the molten metal increases, the pressure of the molten metal is greater than the tension. At this time, the molten metal flows into the longitudinal runner through the first small feed port. Since the pouring time is originally very short, the main horizontal runner is basically in a full state at this time, so it provides stable pressure and molten metal, so that the molten metal passing through the first small feed port is stable and can quickly fill the longitudinal runner. Since the molten metal is relatively concentrated during the pouring process, its temperature drops relatively slowly in the initial pouring. The U-shaped baffle delays the time for the molten metal to pass, thereby affecting the temperature change of the molten metal in the initial pouring, thereby improving the quality of the casting. When the first feed port forms a stable liquid flow channel, the subsequent molten metal flowing into the first small feed port no longer needs to overcome the direct tension of the molten metal. Therefore, the U-shaped mouth can ensure that the molten metal in the cross runner flows fully, avoiding the waste of raw materials and increasing costs.

[0023] The third separator is staggered with the first separator, so that the pouring liquid is delayed for a longer time, and the second separator cooperates with the first separator to further prevent slag from mixing into the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of embodiment 1.

[0025] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure along AA

[0026] Figure 3 Schematic diagram of the structure of the first spoiler.

[0027] The pouring cup 1, the main horizontal runner 2, the part horizontal runner 3, the longitudinal runner 4, the casting sand mold 5, the first baffle 6, the head 61, the neck 62, the first separator 63, the first small feed port 64, the second baffle 71, the second separator 72, the second small feed port 73, and the third separator 65. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] It should be noted that, in the description of the present invention, unless otherwise specified, “plurality” means two or more than two; the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head” and “tail” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Furthermore, the terms “first,” “second,” “third,” etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0032] Meanwhile, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] A ductile iron pouring structure for steady flow and slag blocking, comprising a pouring cup 1, a main horizontal runner 2, a part horizontal runner 3 and a longitudinal runner 4, wherein a pouring port is arranged on the pouring cup, the main horizontal runner 2 is connected to the pouring cup 1, the main horizontal runner 2 is connected to the part horizontal runner 3 through the longitudinal runner 4, the part horizontal runner 3 is connected to the casting sand mold 5, a first baffle 6 is arranged at the connection between the main horizontal runner 2 and the longitudinal runner 4, the first baffle 6 comprises a head 61 and a neck 62, the head is a U-shaped with an opening on one side, the top of the head 61 is The end is higher than the bottom of the main cross runner, and the neck 62 extends from the head to the longitudinal runner 4. The head 61 and the neck 62 are separated by a first partition 63, and the first partition 63 divides the U-shaped opening into a plurality of first small feed ports 64. A second baffle 71 is provided between the longitudinal runner 4 and the part cross runner 3, and the second baffle 71 is arranged in the part cross runner 3. The second baffle 71 is provided with a plurality of second partitions 72 and divides the part cross runner into a plurality of second small feed ports 73.

[0034] The first partition piece 63 extends from the bottom of the U-shaped head toward the upper opening.

[0035] The neck portion 62 is provided with a third separator 65 , and the third separator 65 is staggered with the first separator 63 .

[0036] The cross-sectional area of ​​the single second small feed opening is smaller than the cross-sectional area of ​​the single first small feed opening.

[0037] A working method using the above casting structure is characterized by comprising the following steps:

[0038] A. Pour the molten metal through the pouring cup, the pouring time is 10s;

[0039] B. The molten metal accumulates in the main runner and gradually raises the liquid level. The tension of the molten metal prevents the molten metal from passing through the first small feed opening or forms an intermittent and slow liquid flow channel. The first small feed opening blocks the slag inclusion from entering and passing through;

[0040] C. The molten metal gradually fills the main runner, the pressure of the molten metal increases, the first baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the main runner to the longitudinal runner;

[0041] D. The molten metal accumulates in the longitudinal runner and gradually increases in liquid level. After the liquid level exceeds the second baffle, the tension of the molten metal prevents the molten metal from passing through the second small feed port or forms an intermittent and slow liquid flow channel;

[0042] F. The molten metal gradually fills the longitudinal runner, the pressure of the molten metal increases, the second baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the longitudinal runner into the casting sand mold;

[0043] G. After the molten metal fills the casting sand mold, the corresponding casting can be obtained after cooling.

[0044] The pouring time of step A is 10s.

[0045] By providing a U-shaped baffle and a separator on the U-shaped baffle, slag inclusions in the molten metal cannot pass through the first small feed port, thereby preventing the slag inclusions from subsequently entering the casting and causing defects, thereby improving the product yield. The technical solution of the present invention has a significant effect on improving the appearance defects of the casting, and the appearance defect rate is reduced to less than 1%.

[0046] The U-shaped baffle is divided into multiple first small feed ports. Since the molten metal has a certain viscosity, when the molten metal is less, although the height of the molten metal is higher than the first small feed port, the gravity of the molten metal cannot overcome the tension of the molten metal itself, so the molten metal cannot pass through the first small feed port. As the molten metal increases, the pressure of the molten metal is greater than the tension. At this time, the molten metal flows into the longitudinal runner through the first small feed port. Since the pouring time is originally very short, the main horizontal runner is basically in a full state at this time, so it provides stable pressure and molten metal, so that the molten metal passing through the first small feed port is stable and can quickly fill the longitudinal runner. Since the molten metal is relatively concentrated during the pouring process, its temperature drops relatively slowly in the initial pouring. The U-shaped baffle delays the time for the molten metal to pass, thereby affecting the temperature change of the molten metal in the initial pouring, thereby improving the quality of the casting. When the first feed port forms a stable liquid flow channel, the subsequent molten metal flowing into the first small feed port no longer needs to overcome the direct tension of the molten metal. Therefore, the U-shaped mouth can ensure that the molten metal in the cross runner flows fully, avoiding the waste of raw materials and increasing costs.

[0047] The third separator is staggered with the first separator, so that the pouring liquid is delayed for a longer time, and the second separator cooperates with the first separator to further prevent slag from mixing into the casting.

[0048] In order to improve the poor appearance or to minimize the impact on the appearance while increasing the pouring speed, the principle of the present invention is not to simply increase the thickness of the flow resistance to increase the flow rate, but to adopt a "T" type interception method, thus avoiding the risk of slag inclusion entering the cavity.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ductile iron pouring structure with steady flow and slag blocking, comprising a pouring cup, a main horizontal runner, a part horizontal runner and a longitudinal runner, wherein a pouring port is arranged on the pouring cup, the main horizontal runner is connected to the pouring cup, the main horizontal runner is connected to the part horizontal runner through the longitudinal runner, and the part horizontal runner is connected to the casting sand mold, characterized in that: A first baffle is provided at the connection between the main cross runner and the longitudinal runner, and the first baffle includes a head and a neck. The head is U-shaped with an opening on one side, and the top of the head is higher than the bottom of the main cross runner. The neck extends from the head to the longitudinal runner. A first separator is provided between the head and the neck, and the first separator divides the U-shaped opening into a plurality of first small feed ports. A second baffle is provided between the longitudinal runner and the part cross runner, and the second baffle is arranged in the part cross runner. The second baffle is provided with a plurality of second separators and divides the part cross runner into a plurality of second small feed ports. A third separator is provided on the neck, and the third separator is staggered with the first separator, and the cross-sectional area of ​​a single second small feed port is smaller than the cross-sectional area of ​​a single first small feed port.

2. The slag-blocking ductile iron casting structure with steady flow according to claim 1 is characterized in that: The first partition sheet extends from the bottom of the U-shaped head toward the upper opening.

3. A working method using the casting structure of claim 1 or 2, characterized in that: The following steps are involved: A. Pour the molten metal through the pouring cup; B. The molten metal accumulates in the main runner and gradually raises the liquid level. The tension of the molten metal prevents the molten metal from passing through the first small feed port or forms an intermittent and slow liquid flow channel; C. The molten metal gradually fills the main runner, the pressure of the molten metal increases, the first baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the main runner to the longitudinal runner; D. The molten metal accumulates in the longitudinal runner and gradually increases in liquid level. After the liquid level exceeds the second baffle, the tension of the molten metal prevents the molten metal from passing through the second small feed port or forms an intermittent and slow liquid flow channel; F. The molten metal gradually fills the longitudinal runner, the pressure of the molten metal increases, the second baffle forms a stable liquid flow channel, and the molten metal flows rapidly and stably from the longitudinal runner into the casting sand mold; G. After the molten metal fills the casting sand mold, the corresponding casting can be obtained after cooling.

4. The working method of the casting structure according to claim 3, characterized in that: The pouring time of step A is 10s.

5. The working method of the casting structure according to claim 3, characterized in that: In step B and step C, the first small feed opening blocks the slag inclusion from entering and passing through.

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