A casting process for an obtuse-angle assembled high manganese steel frog

Abstract

The present invention discloses a casting process for an obtuse-angle assembled high manganese steel frog, which includes the steps of: configuring the frog casting mold, at one end close to the gating system, arranging a pouring and feeding open riser at the toe end of the frog casting, arranging a number of exothermic and heat-insulating blind risers on the rail back surface of the frog casting, the blind risers being arranged one by one at the notch on the rail back surface of the frog casting, a casting bolt hole penetrating the frog casting in the width direction being formed on the transverse partition between adjacent notches, and arranging a chill combination on the rail top surface of the frog casting; controlling the molten steel temperature at 1440 - 1460 °C, raising the pouring end of the sand box and pouring at an inclination of 6 °, after the molten steel fills the open riser, replenishing the pouring twice when the liquid level drops by 1 / 3; opening the box 24 hours after pouring, vibrating to shake out the sand, and after waiting until the temperature reaches room temperature of 25 °C, removing the open riser and the blind riser. The process of the present invention can achieve high-quality casting of the obtuse-angle assembled high manganese steel frog through the special configuration of the frog casting mold, reduce internal defects of the casting, and greatly improve the quality of the casting.

Description

Technical Field

[0001] The invention relates to the field of high manganese steel frog casting, and in particular to a blunt-angle assembled high manganese steel frog casting process which can significantly reduce internal defects of frog castings. Background Art

[0002] High manganese steel frog products are a kind of railway turnout accessories, which are generally produced by sand casting. Among them, the main process equipment used for casting and producing high manganese steel frog products includes templates and models. The model is generally made of wood and then installed on the template. The template is generally made of steel to carry the model, so that the model obtains the necessary rigidity and maintains the dimensional stability of the model. The template carries the sand box when casting and producing high manganese steel frog products, and together with the sand box, completes the processes of filling sand into the model and curing the sand mold during sand casting.

[0003] At present, the process of high manganese steel frog has the following main problems: the sand mold has poor concession to the solidification shrinkage of the casting after pouring, which seriously hinders the shrinkage of the casting and easily produces crack defects, which in severe cases leads to the scrapping of the casting; when using the ordinary sand mold production process, in order to make the sand mold able to adapt to the requirements of demolding, turning, and closing during molding, it is necessary to increase the amount of sodium silicate added to the sand mold, so as to ensure the integrity of the sand mold.

[0004] It has sufficient strength, but due to the high sodium silicate content, the sand mold has a large resistance to the solidification shrinkage of the casting after the casting is poured, which is easy to cause crack defects. Therefore, the production of blunt-angle assembled frogs by the existing casting method has many internal defects and cannot meet the requirements of the 2021 industry standard "Technical Conditions for High Manganese Steel Frogs" TB / T447 updated version. The top surface of the assembled product is within 20mm downward, and no casting defects are allowed. Summary of the invention

[0005] In order to solve the defects of the above-mentioned technology, the present invention provides a casting process of an obtuse-angle assembled high-manganese steel frog which can significantly reduce the internal defects of the frog casting.

[0006] The technical solution adopted by the present invention to achieve the above technical effects is:

[0007] A casting process for an obtuse-angle assembled high-manganese steel frog comprises the following steps:

[0008] S1. A frog casting mold is provided. A pouring and shrinkage feeding open riser is provided at the toe end of the frog casting at one end close to the pouring system. A plurality of heat-generating and heat-insulating hidden risers are provided on the rail back of the frog casting. The hidden risers are provided one by one at the grooves on the rail back of the frog casting. A casting bolt hole penetrating the frog casting in the width direction is formed on the cross partition between adjacent grooves. A chiller assembly is provided on the rail top surface of the frog casting.

[0009] S2. Control the temperature of the molten steel at 1440 - 1460 °C, raise the pouring end of the sand box, and pour while tilting at 6°. After the molten steel fills the open riser, make two additional pours when the liquid level drops by 1 / 3.

[0010] S3. Open the box 24 hours after pouring, shake out the sand. After it cools to room temperature of 25 °C, remove the open riser and blind riser.

[0011] Preferably, in the above-mentioned casting process of the obtuse - angle assembled high - manganese steel frog, both the open riser and the blind riser adopt pulp risers.

[0012] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the open riser has a structure with a larger upper part and a smaller lower part, with a bottom diameter of 150 mm, a height of 300 mm, and a slope of 1:1.5.

[0013] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the diameter of the blind riser is 180 mm and the height is 210 mm.

[0014] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the bottom of the blind riser is provided with a cylindrical riser pad with a bottom diameter of 100 mm, a height of 70 mm, and a slope of 1:10.

[0015] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the chill combination includes a first chill assembly, a second chill assembly, and a third chill assembly. The first chill assembly is arranged in the obtuse - angle step area on one side of the frog heart, the second chill assembly is arranged in the entry - rail step area on one side of the frog heart, and the third chill assembly is arranged in the exit - rail step area on one side of the frog heart.

[0016] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the first chill assembly includes four first - type chills and two second - type chills distributed at intervals along the obtuse - angle step area. The four first - type chills are arranged at intervals in the middle area of the obtuse - angle step area, and the two second - type chills are distributed at the two wing tips of the obtuse - angle step area. The second chill assembly is a single second - type chill arranged at the tip of the entry - rail step area, and the third chill assembly is a single second - type chill arranged at the tip of the exit - rail step area.

[0017] Preferably, in the above - mentioned casting process of the obtuse - angle assembled high - manganese steel frog, the first - type chill has dimensions of 160×50×40 mm in length, width, and height, and the second - type chill has dimensions of 160×30×40 mm in length, width, and height.

[0018] The beneficial effects of the present invention are as follows: Through the special configuration of the frog casting mold, the casting process of the obtuse-angle assembled high manganese steel frog can achieve high-quality casting of the obtuse-angle assembled high manganese steel frog, and the internal casting defects of the obtained frog castings can be significantly reduced, greatly improving the internal quality of the castings. Description of the Drawings

[0019] Figure 1 It is a three-dimensional view of one side of the rail back surface of the frog casting of the present invention;

[0020] Figure 2 It is a three-dimensional view of one side of the rail top surface of the frog casting of the present invention. Detailed Embodiments

[0021] To further understand the present invention, the present invention will be further described below with reference to the accompanying drawings of the specification and specific embodiments:

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. In addition, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "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 a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] As Figure 1 and Figure 2 shown, the embodiment of the present invention proposes a casting process for an obtuse-angle assembled high manganese steel frog, which is characterized by including the steps:

[0025] S1. Configure the frog casting mold. At one end near the gating system 1, a riser 2 for casting and feeding is arranged at the toe end of the frog casting 100. A number of exothermic and heat-insulating blind risers 3 are arranged on the web back of the frog casting 100. The blind risers 3 are respectively arranged at the notch of the web back of the frog casting 100. A casting bolt hole 110 that penetrates the frog casting 100 in the width direction is formed on the transverse partition between adjacent notches. A chill combination 4 is arranged on the rail top surface of the frog casting 100;

[0026] S2. Control the molten steel temperature at 1440 - 1460 °C. Raise the height of the pouring end of the sand box and tilt it by 6° for pouring. After the molten steel fills the riser 2, replenish the pouring twice when the liquid level drops by 1 / 3;

[0027] S3. Open the box 24 hours after pouring, shake out the sand. After it cools to room temperature of 25 °C, remove the riser 2 and the blind risers 3.

[0028] Further, in the preferred embodiment of the present invention, both the riser 2 and the blind risers 3 are made of pulp risers.

[0029] Further, in the preferred embodiment of the present invention, the riser 2 has a structure with a larger upper part and a smaller lower part. The bottom diameter is 150 mm, the height is 300 mm, and the slope is 1:1.5.

[0030] Further, in the preferred embodiment of the present invention, the diameter of the blind riser 3 is 180 mm and the height is 210 mm.

[0031] Further, in the preferred embodiment of the present invention, a cylindrical riser pad with a bottom diameter of 100 mm, a height of 70 mm, and a slope of 1:10 is arranged at the bottom of the blind riser 3.

[0032] Further, in the preferred embodiment of the present invention, the chill combination 4 includes a first chill assembly 41, a second chill assembly 42, and a third chill assembly 43. The first chill assembly 41 is arranged in the obtuse angle step area 120 on one side of the rail center. The second chill assembly 42 is arranged in the rail entry step area 130 on one side of the rail center. The third chill assembly 43 is arranged in the rail exit step area 140 on one side of the rail center.

[0033] Further, in the preferred embodiment of the present invention, the first chill assembly 41 includes four first - type chills and two second - type chills that are spaced apart along the obtuse angle step area 120. The four first - type chills are arranged at intervals in the middle area of the obtuse angle step area 120. The two second - type chills are distributed at the two wing tips of the obtuse angle step area 120. The second chill assembly 42 is a second - type chill and is arranged at the tip position of the rail entry step area 130. The third chill assembly 43 is a second - type chill and is arranged at the tip position of the rail exit step area 140.

[0034] Further, in a preferred embodiment of the present invention, the first type of chill has dimensions of 160×50×40 mm in length, width and height, and the second type of chill has dimensions of 160×30×40 mm in length, width and height.

[0035] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A casting process for an obtuse angle assembled high manganese steel frog, characterized in that, Including the steps: S1. Configure the frog casting mold. At one end close to the gating system (1), a pouring and feeding open riser (2) is arranged at the toe end of the frog casting (100). A number of exothermic and heat-insulating blind risers (3) are arranged on the running surface back of the frog casting (100). The blind risers (3) are respectively arranged at the notch positions on the running surface back of the frog casting (100). A casting bolt hole (110) penetrating the frog casting (100) in the width direction is formed on the transverse partition between adjacent notches. A chill combination (4) is arranged on the running surface of the frog casting (100). S2. Control the molten steel temperature at 1440 - 1460 °C. Pad up the pouring end of the sand box and pour at an inclination of 6°. After the molten steel fills the open riser (2), make two additional pours when the liquid level drops by 1 / 3. S3. Open the box 24 hours after pouring, vibrate to shake out the sand. After it is left to reach room temperature of 25 °C, remove the open riser (2) and the blind riser (3). Among them, a cylindrical riser pad with a bottom diameter of 100 mm, a height of 70 mm, and a slope of 1:10 is arranged at the bottom of the blind riser (3). The chill combination (4) includes a first chill assembly (41), a second chill assembly (42), and a third chill assembly (43). The first chill assembly (41) is arranged in the obtuse angle step area (120) on one side of the rail center. The second chill assembly (42) is arranged in the rail entry step area (130) on one side of the rail center. The third chill assembly (43) is arranged in the rail exit step area (140) on one side of the rail center. The first chill assembly (41) includes four first-type chills and two second-type chills distributed at intervals along the obtuse angle step area (120). The four first-type chills are arranged at intervals in the middle area of the obtuse angle step area (120). The two second-type chills are distributed at the wing tips on both sides of the obtuse angle step area (120). The second chill assembly (42) is a second-type chill arranged at the tip position of the rail entry step area (130). The third chill assembly (43) is a second-type chill arranged at the tip position of the rail exit step area (140). The length, width, and height dimensions of the first-type chill are 160×50×40 mm, and the length, width, and height dimensions of the second-type chill are 160×30×40 mm.

2. The casting process of the obtuse angle assembled high manganese steel frog according to claim 1, characterized in that, Both the open riser (2) and the blind riser (3) adopt pulp risers.

3. The casting process of the obtuse angle assembled high manganese steel frog according to claim 1, characterized in that, The open riser (2) has a structure with a larger upper part and a smaller lower part, a bottom diameter of 150 mm, a height of 300 mm, and a slope of 1:1.

5.

4. The casting process of the obtuse-angle assembled high manganese steel frog according to claim 1, characterized in that, The diameter of the blind riser (3) is 180 mm, and the height is 210 mm.

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