Process for the casting of high manganese steel frog marking fastenings

Abstract

This invention provides a casting process for fixing markings on high-manganese steel frogs. A support block is fitted between the marking sand mold on the side of the model rail wall and the bottom of the model rail wall within the sand box. The marking sand mold has a special cross-sectional structure to prevent displacement. One side of the marking sand mold is tightly attached to the model rail wall; the lower side is supported and fixed by the support block; and the surrounding area is tightly wrapped with molding sand. After hardening and demolding, the support block area is filled and solidified with molding sand to ensure that the marking sand mold and the model rail wall remain coplanar. This reduces the amount of grinding required due to non-coplanarity between the marking sand mold and the model rail wall, and also standardizes the position of the markings on frogs of the same model. This invention solves the technical problems of marking sand mold displacement and excessive grinding of the markings on the castings; the markings on the cast frogs of the same model are standardized and neat, making it suitable for widespread application.

Description

Technical Field

[0001] This invention belongs to the field of casting technology for operational transportation, and specifically relates to a casting process for fixing high manganese steel frog marks. Background Technology

[0002] During the production of high manganese steel frogs, each frog casting is marked with a casting mark, so it is necessary to cast the casting mark on each frog casting.

[0003] Before styling, (such as) Figure 1 (As shown) First, prefabricate a rectangular mark sand mold 3; during the molding process, first lay a layer of molding sand on one side of the model 2 rail wall of the sand box 1 and compact and level it, then place the mark sand mold 3 on the leveled molding sand, and make one side of the mark sand mold 3 tightly adhere to the rail wall of the model 2, and then wrap the remaining sides of the mark sand mold 3 with molding sand and compact it.

[0004] The marker sand mold 3, fixed by this method, will move when the compacted molding sand is wrapped around it, such as... Figure 1 As indicated by the arrow; subsequently, during the sand compaction process, the sand is further compacted and flows, and the marking sand mold 3 will also move downwards or sideways along with the sand flow, and may even no longer be in close contact with the rail wall of model 2; after the sand hardens and the mold is removed, the precast marking sand mold 3 will be recessed into the sand mold box 1, causing the casting marks on the casting to be higher than the rail wall of model 2, resulting in excessive grinding of the casting marks. In response, the following improvement technical solution is proposed. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a high-manganese steel turnout marking and fixing casting process, which solves the technical problems of marking sand mold displacement and excessive grinding of casting markings.

[0006] The technical solution adopted in this invention is as follows: a high-manganese steel frog marking fixing casting process, wherein a support block is fitted between the marking sand mold on the side of the model rail wall and the bottom of the model rail wall in the sand box; the marking sand mold has a special cross-sectional structure to prevent displacement; one side of the marking sand mold is tightly attached to the model rail wall; the lower side of the marking sand mold is supported and fixed by the support block; the marking sand mold is tightly wrapped with molding sand to prevent displacement of the marking sand mold during the molding and filling process and during the molding and compaction process; the special cross-sectional structure of the marking sand mold is also used to reduce the displacement of the marking sand mold caused by the flow of molding sand; after hardening and demolding, the support block area is filled with molding sand and solidified to ensure that the marking sand mold and the model rail wall remain coplanar, to reduce the amount of grinding caused by the non-coplanarity of the marking sand mold and the model rail wall, and at the same time to standardize the position of the casting markings of the same model frog.

[0007] In the above technical solution, further: the special cross-section of the marked sand mold is one of the trapezoidal structure, arc structure, and wedge structure.

[0008] In the above technical solution, preferably, the angle α between the inclined surface of the trapezoidal or wedge-shaped marking sand mold and the horizontal plane is 30° to 45°.

[0009] Advantages of this invention compared to existing technologies:

[0010] 1. This invention adds a support block to the lower part of the model rail wall. During the process of the marking sand mold being surrounded and compacted by molding sand, the marking sand mold will not move and can ensure that the marking sand mold and the model rail wall are in close contact, thereby ensuring the regularity of the marking casting.

[0011] 2. By changing the marking sand mold to a special cross-section, the present invention can reduce the horizontal movement of the marking sand mold caused by the flow of molding sand during the molding sand compaction process, avoid the protrusions caused by the non-coplanarity of the precast sand mold and the rail wall surface after the molding sand hardens and is demolded, and reduce the amount of grinding.

[0012] 3. This invention can standardize the casting mark position of the same type of turnout, so as to achieve the neatness and standardization of the casting marks when turnouts of the same type are stacked together. Attached Figure Description

[0013] Figure 1 This is a process diagram based on existing technology;

[0014] Figure 2 This is a process diagram of the present invention;

[0015] In the diagram: 1-sand box, 2-model, 3-marking sand mold, 4-support block. Detailed Implementation

[0016] The following will refer to the appendices in the embodiments of the present invention. Figure 2 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] (like Figure 2 (As shown) A high manganese steel fork mark fixing casting process, wherein the sand mold 3 for marking the rail wall side of the model 2 in the sand box 1 and the bottom of the rail wall side of the model 2 are fitted with a support block 4.

[0018] The specific shape and number of the support blocks 4 are determined according to the shapes of the marked sand mold 3 and the model 2.

[0019] By adding a support block 4 to the lower part of the rail wall side of model 2, the marking sand mold 3 will not move during the process of being surrounded and compacted by molding sand. This invention can ensure that the marking sand mold 3 and the rail wall of model 2 are in close contact, thereby ensuring the regularity of the marking casting.

[0020] The marked sand mold section 3 has a special cross-sectional structure to prevent displacement.

[0021] In the above embodiments, the special cross-sectional structure of the marked sand mold 3 is one of a trapezoidal structure, an arc-shaped structure, or a wedge-shaped structure. Any of these structures has the function of preventing displacement.

[0022] (like Figure 2 (As shown in the embodiment) In the above embodiment, preferably, the angle α between the inclined surface of the trapezoidal or wedge-shaped marking sand mold 3 and the horizontal plane is 30° to 45°.

[0023] This invention reduces the horizontal movement of the marking sand mold 3 caused by the flow of molding sand during the compaction process by changing the marking sand mold 3 to a special cross-section. It also avoids the protrusions caused by the non-coplanarity of the precast sand mold and the rail wall surface after the molding sand hardens and is demolded, thus reducing the amount of grinding.

[0024] Regarding the specific casting process: one side of the marking sand mold 3 is tightly attached to the rail wall of model 2; the lower side of the marking sand mold 3 is supported and fixed by the support block 4; the marking sand mold 3 is tightly wrapped with molding sand to prevent displacement of the marking sand mold 3 during the molding and filling process and during the molding and compaction process; the special cross-sectional structure of the marking sand mold 3 is also used to reduce the displacement of the marking sand mold 3 caused by the flow of molding sand; after hardening and demolding, the support block 4 is filled with molding sand and solidified to ensure that the marking sand mold 3 and the rail wall of model 2 remain coplanar, to reduce the amount of grinding caused by the non-coplanarity of the marking sand mold 3 and the rail wall of model 2, and at the same time to standardize the position of the casting marks of the same model of turnout.

[0025] Specifically, support blocks 4 of different specifications and quantities can be designed and manufactured according to different types of frogs; and the cross-sectional inclination angle α of the marking sand mold 3 with different inclination angles can be designed and manufactured according to the inclination angle of the rail wall.

[0026] The working principle of this invention is as follows: By adding a support block 4 to the lower part of the rail wall side of model 2, and changing the marking sand mold 3 to a special cross-sectional structure: During the molding and sand filling process, while manually pressing the upper inclined surface of the marking sand mold 3, the molding sand around the marking sand mold 3 is compacted, which can prevent the marking sand mold 3 from moving during manual compaction. During the molding and vibration compaction process, the horizontal movement of the marking sand mold 3 caused by the flow of molding sand can be reduced. After hardening and demolding, the support block 4 is filled with molding sand and solidified, which can ensure that the marking sand mold 3 remains coplanar with the rail wall surface, reducing the amount of grinding caused by the marking sand mold 3 and the sand mold rail wall surface not being coplanar, and at the same time standardizing the casting marking position of the same model of frog.

[0027] From the above description, it can be seen that: this invention can ensure that the marking sand mold 3 and the rail wall surface of the model 2 are tightly attached; it can reduce the horizontal movement of the marking sand mold 3 caused by the flow of molding sand during the molding sand compaction process, and avoid the formation of protrusions due to the non-coplanarity of the precast sand mold and the rail wall surface after the molding sand hardens and is demolded. It can standardize the casting marking position of the same type of frog, achieving the neatness and standardization of the casting markings when the same type of frog is stacked together.

[0028] In summary, this invention solves the technical problems of displacement of the marking sand mold and excessive grinding of the marking on the casting. The marking positions of the cast turnouts of the same model are standardized and neat, making it suitable for widespread application.

[0029] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A high-manganese steel turnout marking fixing casting process, characterized in that: A support block (4) is fitted between the marking sand mold (3) on the rail wall side of the model (2) inside the sand box (1) and the bottom of the rail wall side of the model (2); the marking sand mold (3) has a special cross-section structure to prevent displacement; one side of the marking sand mold (3) is in close contact with the rail wall surface of the model (2); the lower side of the marking sand mold (3) is supported and fixed by the support block (4); the marking sand mold (3) is tightly wrapped with molding sand to prevent the marking sand mold (3) from shifting during the molding and filling process and during the molding and compaction process; the special cross-section structure of the marking sand mold (3) is also used to reduce the displacement of the marking sand mold (3) caused by the flow of molding sand; after hardening and demolding, the support block (4) is filled with molding sand and solidified to ensure that the marking sand mold (3) and the rail wall surface of the model (2) remain coplanar, to reduce the amount of grinding caused by the non-coplanarity of the marking sand mold (3) and the rail wall surface of the model (2), and at the same time to standardize the position of the casting mark of the same model of fork.

2. The high-manganese steel turnout marking fixing casting process according to claim 1, characterized in that: The special cross-section of the marked sand mold (3) is one of the trapezoidal structure, arc structure, or wedge structure.

3. The high-manganese steel turnout marking fixing casting process according to claim 2, characterized in that: The angle α between the inclined surface and the horizontal surface of the trapezoidal or wedge-shaped marking sand mold (3) is 30° to 45°.

Images