Device and method for improving casting plug yield rate

Abstract

The invention discloses a device and method for improving the success rate of casting plugs. The structure of plug casting comprises an upper sand box and a lower sand box. The upper sand box is a riser sand box, and the lower sand box is a product plug sand box. A riser cavity is fixed in the upper sand box, and a pouring port is fixed on the riser cavity. A plug sand core is arranged in the lower sand box, and a plug cavity is arranged around the plug sand core. Molten steel passes through casting channels arranged in the upper sand box and the lower sand box and enters the plug cavity along the plug sand core in the lower sand box. A riser sand core is arranged in the riser cavity, and the diameter of the riser sand core is smaller than that of the riser cavity. One or more riser cavities are arranged along the upper sand box. The riser sand core is cylindrical, and a plurality of through holes are arranged in the cylinder from top to bottom. The riser sand core consists of two parts, an upper part and a lower part, which are integrated. The lower part of the riser sand core is a cylindrical structure, and the upper part of the riser sand core is a semicircular body.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a device and a method for improving the yield rate of a casting plug. Background Art

[0002] In the production of seamless steel pipes, the piercing machine process is to roll the solid tube into a hollow rough tube. The piercing machine head is a hot deformation tool that squeezes and penetrates the solid tube into a hollow rough tube. The head is generally made by sand casting. The structure of the head sand casting consists of two parts, the upper and lower sand boxes, one part is the sand box for the product head, and the other part is the riser sand box. The height of the traditional riser sand box is relatively large, and the volume of the residual riser column is large after the molten steel is cast. After the casting is cooled and the sand is cleared, the operator will use gas welding to separate the product head and the residual riser column, and then the product head enters the next process, and the residual riser column is recycled as waste, resulting in a relatively low yield rate of the head and a high manufacturing cost of the head. Summary of the invention

[0003] The object of the present invention is to provide a device and method for improving the casting plug yield rate, so as to solve the problems raised in the above background technology.

[0004] The objective of the present invention is achieved through the following technical scheme: a device for improving the success rate of a casting plug, the plug casting structure comprises an upper flask and a lower flask, the upper flask is a riser flask, the lower flask is a product plug flask, a riser cavity is fixed in the upper flask, a casting port is fixed on the riser cavity, a plug sand core is arranged in the lower flask, a plug cavity is arranged outside the plug sand core, molten steel passes through the casting channels arranged inside the upper flask and the lower flask, and enters the plug cavity along the plug sand core in the lower flask;

[0005] A riser sand core is arranged in the riser cavity, and the diameter of the riser sand core is smaller than the diameter of the riser cavity.

[0006] Furthermore, one or more riser chambers are provided along the upper sand box.

[0007] Furthermore, the riser sand core is cylindrical, and a plurality of through holes extending from top to bottom are arranged inside the cylinder.

[0008] Furthermore, the riser sand core is composed of two integrated parts, the upper and lower parts, and the lower part of the riser sand core is a cylindrical structure, and the upper part of the riser sand core is a semicircular body.

[0009] Furthermore, the diameter of the cylinder at the lower part of the riser sand core is one-half or one-third smaller than the diameter of the riser cavity, and the diameter of the semicircular body at the upper part of the riser sand core is larger than the diameter of the cylinder.

[0010] Furthermore, a gap is left between the semicircular body of the upper part of the riser sand core and the inner wall of the riser cavity.

[0011] Furthermore, two riser cavities are arranged along the upper sand box, and riser sand cores of the same or different forms are arranged in the riser cavities.

[0012] Furthermore, a riser housing is fixedly provided on the periphery of the riser housing, and the riser housing is made of a heat-insulating material or a heat-generating material.

[0013] Furthermore, the size of the upper sand box is 1100×700×350cm, and the riser height is 35cm. When the head of the product part changes from liquid to solid, the volume shrinks. The liquid metal in the riser is promptly replenished into the head of the product part. The shrinkage compensation height is 5cm-10cm, and the volume of the riser after casting is: riser cross-sectional area A×riser height: 225×(35-10)cm3.

[0014] A method for improving the casting plug yield rate is as follows:

[0015] During the casting process, a crane lifts a ladle and pours molten steel through the pouring port. The molten steel passes through the pouring channels inside the upper and lower flasks and enters the flask cavity along the plug sand core in the lower flask. The casting is stopped when the molten steel is poured into the top of the riser cavity in the upper flask. After that, the product plug shrinks in volume when it changes from liquid to solid through the multiple top-to-bottom through holes of the riser sand core or the gap between the riser sand core and the riser cavity. The product plug shrinks in volume when it changes from liquid to solid, and the molten metal in the riser cavity that is still in the liquid state will be replenished in time into the product plug. After casting, cooling and sand removal, the volume of the residual riser will be very small or there will be no residual riser, and then the product plug enters the next process.

[0016] The sand box size of the riser cavity is 1100×700×350cm, and the riser height is 35cm. When the head of the product changes from liquid to solid, the volume shrinks, and the liquid metal in the riser will be replenished into the head of the product in time. The replenished volume is converted into a shrinkage compensation height of 5cm-10cm;

[0017] The height of the supplement is determined by the volume of the product head and the characteristics of different metals. The volume of the remaining riser column after casting is controlled as: riser cross-sectional area A×riser height: 225×(35-10) cm3. After casting, cooling and sand removal, the operator uses gas welding to separate the product head and the remaining riser column, and then the product head enters the next process, and the remaining riser column is recycled as waste; the remaining riser column after casting and sand removal is useless. In order to reduce the casting cost, it needs to be redesigned to shorten the riser mold height from 35cm to within 10cm. Correspondingly, when filling the riser sand mold, only fill it to a height of within 10cm.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: in order to reduce the casting cost, a redesign is required, and a riser sand core is arranged in the riser cavity. The riser sand core is a cylinder smaller than the riser cavity, and a plurality of through holes are arranged in the cylinder from top to bottom. Such a design reduces the surface area of ​​the molten steel in the riser cavity, effectively prevents the heat dissipation of the molten steel, and achieves the purpose of heat preservation of the molten steel. Moreover, due to the addition of the riser sand core design, the volume of the riser cavity is reduced, and the yield rate of the casting plug is improved.

[0019] At the same time, a riser sand core is arranged in the riser cavity, and the riser sand core is composed of two parts, the upper and lower parts of which are integrated. The lower part of the riser sand core is a cylinder smaller than the riser cavity, and the upper part is a semicircular body, the diameter of the semicircular body is larger than the diameter of the cylinder, and there is a gap between the semicircular body and the riser cavity. This design reduces the surface area of ​​the molten steel in the riser cavity, and the upper semicircular body has a covering effect on the molten steel, effectively preventing the heat dissipation of the molten steel, and achieving the purpose of heat preservation of the molten steel. In addition, due to the addition of the riser sand core design, the volume of the riser cavity is reduced, and the yield rate of the casting plug is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of another state of the present invention. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected 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.

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] like Figure 1-2 As shown, a device for improving the success rate of casting plugs, the structure of plug casting includes an upper flask 2 and a lower flask 7, the upper flask 2 is a riser flask, the lower flask 7 is a product plug flask, a riser cavity 3 is fixed in the upper flask 2, a casting port 1 is fixed on the riser cavity 3, a plug sand core 6 is arranged in the lower flask 7, a plug cavity 5 is arranged outside the plug sand core 6, and molten steel passes through the casting channels arranged inside the upper flask 2 and the lower flask 7, and enters the plug cavity 5 along the plug sand core 6 in the lower flask 7;

[0026] A riser sand core 4 is disposed in the riser cavity 3 , and a diameter of the riser sand core 4 is smaller than a diameter of the riser cavity 3 .

[0027] One or more riser chambers 3 are provided along the upper flask 2 .

[0028] The riser sand core 4 is cylindrical, and a plurality of through holes extending from top to bottom are arranged inside the cylinder.

[0029] In order to reduce the volume of the riser cavity and improve the yield rate of the casting plug when in use, a riser sand core design is added. A further preferred embodiment of the present invention is that the riser sand core 4 consists of two parts, an upper part and a lower part, and the lower part of the riser sand core 4 is a cylindrical structure, and the upper part of the riser sand core 4 is a semicircular body.

[0030] In order to reduce the surface area of ​​the molten steel in the riser cavity when in use, the upper semicircular body has a covering effect on the molten steel, effectively preventing the heat dissipation of the molten steel and achieving the purpose of keeping the molten steel warm. A further preferred embodiment of the present invention is that the diameter of the cylinder in the lower part of the riser sand core 4 is one-half or one-third smaller than the diameter of the riser cavity 3, and the diameter of the semicircular body in the upper part of the riser sand core 4 is larger than the diameter of the cylinder.

[0031] In order to facilitate volume shrinkage of the gap between the riser sand core 4 and the riser cavity 3 when in use, and volume shrinkage of the product head when it changes from liquid to solid, a further preferred embodiment of the present invention is that a gap is left between the semicircular body of the upper part of the riser sand core 4 and the inner wall of the riser cavity 3.

[0032] In order to facilitate the purpose of casting in use, a further preferred embodiment of the present invention is that two riser chambers 3 are arranged along the upper flask 2, and riser sand cores 4 of the same or different forms are arranged in the riser chambers 3.

[0033] In order to facilitate heat preservation of the riser cavity in use and prolong the cooling time of the riser cavity, a further preferred embodiment of the present invention is that a riser cavity sleeve is fixedly provided on the periphery of the riser cavity 3, and the riser cavity sleeve is made of heat-insulating material or heat-generating material.

[0034] In order to facilitate use, the riser column remaining after casting and cleaning is useless. In order to reduce the casting cost, the size of the upper sand box 2 is 1100×700×350cm, and the riser height is 35cm. When the head of the product part changes from liquid to solid, the volume shrinks. The liquid metal in the riser is replenished into the head of the product part in time. The shrinkage compensation height is 5cm-10cm, and the volume of the riser after casting is: riser cross-sectional area A×riser height: 225×(35-10)cm3.

[0035] A method for improving the yield rate of a casting plug comprises the following steps:

[0036] During the casting process, a crane lifts a ladle and pours molten steel through a pouring port 1. The molten steel passes through the casting channels inside the upper flask 2 and the lower flask 7, and enters the plug cavity 5 along the plug sand core 6 in the lower flask 7. The casting is stopped when the molten steel is poured into the top of the riser cavity 3 in the upper flask 2. After that, when the plug of the product is transformed from liquid to solid, the volume shrinks through the multiple top-to-bottom through holes of the riser sand core 4 or the gap between the riser sand core 4 and the riser cavity 3. When the plug of the product is transformed from liquid to solid, the volume shrinks, and the molten metal in the riser cavity 2 that is still in the liquid state will be replenished into the plug of the product in time. After casting, cooling and sand removal, the volume of the residual riser will be very small or there will be no residual riser, and then the plug of the product enters the next process.

[0037] The sand box size of the riser cavity 3 is 1100×700×350cm, and the riser height is 35cm. When the head of the product changes from liquid to solid, the volume shrinks, and the liquid metal in the riser will be replenished into the head of the product in time. The replenished volume is converted into a shrinkage compensation height of 5cm-10cm;

[0038] The height of the supplement is determined by the volume of the product head and the characteristics of different metals. The volume of the remaining riser column after casting is controlled as: riser cross-sectional area A×riser height: 225×(35-10) cm3. After casting, cooling and sand removal, the operator uses gas welding to separate the product head and the remaining riser column, and then the product head enters the next process, and the remaining riser column is recycled as waste; the remaining riser column after casting and sand removal is useless. In order to reduce the casting cost, it needs to be redesigned to shorten the riser mold height from 35cm to within 10cm. Correspondingly, when filling the riser sand mold, only fill it to a height of within 10cm. Specific embodiment 1

[0040] Taking the casting of Φ460 specification plug as an example, the size of the riser sand box is 1100×700×350cm, and the riser height is 35cm. When the product plug changes from liquid to solid, the volume shrinks, and the liquid metal in the riser is replenished to the product plug in time. The shrinkage compensation height is 5cm-10cm. In this way, the volume of the riser after casting is: riser cross-sectional area A×riser height: 225×(35-10)cm 3. After casting, cooling and sand removal, the product plug and the riser will be separated by gas welding, and then the product plug enters the next process, and the riser is recycled as waste. In order to reduce the casting cost, it is necessary to redesign and set a riser sand core in the riser cavity. The riser sand core is a cylinder smaller than the riser cavity, and there are multiple through holes from top to bottom inside the cylinder. This design reduces the surface area of ​​the molten steel in the riser cavity, effectively preventing the heat dissipation of the molten steel and achieving the purpose of heat preservation of the molten steel. In addition, due to the addition of the riser sand core design, the volume of the riser cavity is reduced, and the yield rate of the casting plug is improved. Specific embodiment 2

[0042] A riser sand core is arranged in the riser cavity, and the riser sand core is composed of two parts, the upper and lower parts of which are integrated. The lower part of the riser sand core is a cylinder smaller than the riser cavity, and the upper part is a semicircular body, the diameter of the semicircular body is larger than the diameter of the cylinder, and there is a gap between the semicircular body and the riser cavity. This design reduces the surface area of ​​the molten steel in the riser cavity, and the upper semicircular body has a covering effect on the molten steel, effectively preventing the heat dissipation of the molten steel, achieving the purpose of heat preservation of the molten steel, and due to the addition of the riser sand core design, the volume of the riser cavity is reduced, and the yield rate of the casting plug is improved.

[0043] Working process: The ladle pours molten steel through the pouring port 1, and the molten steel passes through the casting channels inside the upper flask 2 and the lower flask 7, and enters the plug cavity 5 along the plug sand core 6 in the lower flask 7. The casting is stopped when the molten steel is poured into the top of the riser cavity 3 in the upper flask 2. After that, when the plug of the product is transformed from liquid to solid, the volume shrinks through the multiple top-to-bottom through holes of the riser sand core 4 and the gap between the riser sand core 4 and the riser cavity 3, so that the metal liquid in the riser that is still in the liquid state is replenished into the plug of the product in time. After casting, cooling and sand removal, the residual volume of the riser will be very small, and then the plug of the product will enter the next process. This improves the yield rate of the plug of the product.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for improving the yield rate of casting plugs, characterized in that: The structure of the plug casting comprises an upper flask (2) and a lower flask (7), wherein the upper flask (2) is a riser flask, and the lower flask (7) is a product plug flask. A riser cavity (3) is fixed in the upper flask (2), and a casting port (1) is fixed on the riser cavity (3). A plug sand core (6) is arranged in the lower flask (7), and a plug cavity (5) is arranged around the plug sand core (6). Molten steel passes through casting channels arranged inside the upper flask (2) and the lower flask (7), and enters the plug cavity (5) along the plug sand core (6) in the lower flask (7); A riser sand core (4) is arranged in the riser cavity (3), and the diameter of the riser sand core (4) is smaller than the diameter of the riser cavity (3); The riser sand core (4) is cylindrical, and a plurality of through holes extending from top to bottom are arranged inside the cylinder; or the riser sand core (4) is composed of two parts, an upper part and a lower part, and the lower part of the riser sand core (4) is a cylindrical structure, and the upper part of the riser sand core (4) is a semicircular body; The diameter of the cylinder at the lower part of the riser sand core (4) is one-half or one-third smaller than the diameter of the riser cavity (3), and the diameter of the semicircular body at the upper part of the riser sand core (4) is larger than the diameter of the cylinder; A gap is left between the semicircular body of the upper part of the riser sand core (4) and the inner wall of the riser cavity (3); Two riser chambers (3) are arranged along the upper sand box (2), and riser sand cores (4) of the same or different forms are arranged in the riser chambers (3).

2. A device for improving the casting plug yield rate according to claim 1, characterized in that: A riser housing is fixedly provided on the periphery of the riser housing (3), and the riser housing is made of a heat-insulating material or a heat-generating material.

3. A device for improving the casting plug yield rate according to claim 2, characterized in that: The size of the upper sand box (2) is 1100×700×350cm, and the riser height is 35cm. When the top of the product part changes from liquid to solid, the volume shrinks. The liquid metal in the riser is replenished into the top of the product part in time. The shrinkage compensation height is 5cm-10cm, and the volume of the riser after casting is: riser cross-sectional area A×riser height: 225cm2×(35-10)cm.

4. The application method of the device for improving the casting plug yield rate according to any one of claims 1 to 3, characterized in that: The steps include: During the casting process, a crane lifts a ladle and pours molten steel through a pouring port (1). The molten steel passes through the pouring channels inside the upper flask (2) and the lower flask (7), and enters the flask cavity (5) along the plug sand core (6) in the lower flask (7). The casting is stopped when the molten steel is poured into the top of the riser cavity (3) in the upper flask (2). After that, when the flask of the product changes from liquid to solid, the volume of the flask shrinks through the multiple upward and downward through holes of the riser sand core (4) or the gap between the riser sand core (4) and the riser cavity (3). When the flask of the product changes from liquid to solid, the volume of the flask shrinks, and the molten metal in the upper flask (2) that is still in the liquid state will be replenished in time into the flask of the product. After casting, cooling and sand removal, the volume of the remaining riser will be very small or there will be no remaining riser, and then the flask of the product will enter the next process. The sand box size of the riser cavity (3) is 1100×700×350cm, and the riser height is 35cm. When the head of the product changes from liquid to solid, the volume shrinks, and the liquid metal in the riser will be replenished into the head of the product in time. The replenished volume is converted into a shrinkage compensation height of 5cm-10cm. The height of the supplement is determined by the volume of the product head and the characteristics of different metals. The volume of the remaining riser column after casting is controlled as follows: Riser cross-sectional area A × riser height: 225 × (35-10) cm 3 After casting, cooling and sand cleaning, the operator uses gas welding to separate the top of the product and the remaining riser column, and then the top of the product enters the next process, and the remaining riser column is recycled as waste; the remaining riser column after casting and sand cleaning is useless, in order to reduce the casting cost, it needs to be redesigned, and the height of the riser mold is shortened from 35cm to less than 10cm. Correspondingly, when filling the riser sand mold with sand, it is only filled to a height of less than 10cm.

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