A gate stick with a buffer structure

Abstract

The utility model discloses a take buffer structure's sprue stick, including sprue cup connecting structure, stick body and three connecting platforms of circumferential distribution. Its innovation lies in the bottom center of stick body setting semispherical buffer convex ring, and the bottom of convex ring adds the protruding structure. Metal liquid impact buffer convex ring spreads to all sides after, and the steady flow is divided to the connecting platform of inclination 60~80 DEG. The design reduces casting defects significantly through buffering and reducing speed, optimizing flow direction. The bottom protrusion is slag collection and buffering effect, can reduce the impact to the inner wall of the cavity, is favorable to the matching of the shell vibrating tool simultaneously, reduces the damage of the shell vibrating tool to the casting in the later period.

Description

Technical Field

[0001] This utility model relates to the field of turbine casting technology, specifically to a gating bar with a buffer structure. Background Technology

[0002] Investment casting, also known as lost-wax casting, includes processes such as wax pressing, wax trimming, tree assembly, slurry application, wax melting, pouring molten metal, and post-processing. Lost-wax casting uses wax to create a wax model of the part to be cast. A silica sol slurry is then applied to the wax model to form a mold shell. The wax inside the mold shell is then melted and removed. After the mold shell is fired, molten metal is poured into it through a gating gate. After cooling, the mold shell undergoes processes such as vibrating, cutting, grinding, and sandblasting to obtain the desired part. In automated investment casting for producing small parts, multiple parts are typically cast in batches at once, requiring the use of a sprue. However, traditional sprue bars have the following problems: 1. The bottom of a traditional gating system is flat (e.g., Figure 1 As shown, the bottom turbine will be much higher than the rod body after casting. During subsequent shell vibration, the bottom turbine is prone to collision, thus reducing the yield.

[0003] 2. When the bottom of the gating gate is flat, turbulence will be generated when pouring molten metal. The molten metal will repeatedly wash away the inner wall, which will easily wash away the sand particles on the inner wall and enter the casting, resulting in an increase in the defect rate of the casting. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a gate bar with a buffer structure.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a sprue bar with a buffer structure, including a sprue cup connecting structure, a bar body, and a connecting platform. The sprue cup connecting structure is located at the upper end of the bar body, the bar body is columnar, and the connecting platform is evenly distributed circumferentially on the outer side of the bar body. The feature is that a buffer protrusion ring is provided at the bottom of the bar body.

[0006] Furthermore, the bottom of the buffer ring is provided with a bottom protrusion. The bottom protrusion serves to collect slag and buffer, reducing the impact on the inner wall of the cavity, and also facilitates the matching of the vibrating shell tooling.

[0007] Preferably, there are three connecting platforms.

[0008] Preferably, the buffer ring is hemispherical. The hemispherical design allows the molten metal to flow radially instead of vertically, reducing impact on the bottom of the cavity, thereby preventing turbulence during molten metal flow, reducing air entrainment and scouring of the mold shell, and reducing contact with air, thus lowering the risk of oxidation.

[0009] Preferably, the connecting platform is tilted downwards, and the tilt angle between the connecting platform and the rod body is 60-80 degrees. A tilt angle of 60-80 degrees between the connecting platform and the rod body is beneficial for improving flow stability and feeding efficiency. An angle that is too low or too high will affect the flow state of the molten steel and thus the casting quality.

[0010] Furthermore, a transition arc is provided at the connection between the connecting platform and the rod body. The transition arc can reduce stress concentration, prevent cracking, and facilitate the flow of molten metal into the casting along the connecting platform.

[0011] The advantages and beneficial effects of this utility model are as follows: 1. A bottom protrusion is provided at the bottom, which can reduce the impact of molten metal on the inner wall of the cavity and store the washed-off residue here, preventing the residue from being carried into the casting by the molten metal.

[0012] 2. The bottom protrusion can also facilitate the matching of the vibrating shell tooling in the subsequent vibrating shell process and prevent the vibrating shell equipment from damaging the bottom turbine of the casting.

[0013] 3. The hemispherical buffer ring at the bottom can effectively reduce turbulence and reduce the scouring of the inner wall by the molten metal, thereby reducing the sand particle entrainment rate of the mold shell. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the existing technology's gating system. Figure 2 This is a schematic diagram of the structure of the gating gate of this utility model; Figure 3 This is a schematic diagram of the structure of the sprue without castings in this utility model.

[0015] In the diagram: 1. Sprue cup connection structure; 2. Rod body; 3. Connecting platform; 4. Buffer ring; 5. Bottom protrusion; 6. Transition arc. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] according to Figures 2-3 As shown, this utility model is a sprue bar with a buffer structure, including a sprue cup connecting structure 1, a bar body 2, and a connecting platform 3. The sprue cup connecting structure 1 is located at the upper end of the bar body 2. The bar body 2 is columnar. The connecting platform 3 is evenly distributed around the outer side of the bar body 2. The feature is that a buffer protrusion ring 4 is provided at the bottom of the bar body 2.

[0018] according to Figure 2As shown, in any embodiment, the bottom of the buffer ring 4 is provided with a bottom protrusion 5. The difference between this embodiment and other embodiments is that the bottom protrusion 5 serves as a structure for collecting slag and buffering, reducing the impact on the inner wall of the cavity, and also facilitating the matching of the vibrating shell tooling.

[0019] according to Figure 2 As shown, in any embodiment, there are three connecting platforms 3. The difference between this embodiment and other embodiments is that having three connecting platforms 3 can improve casting efficiency.

[0020] according to Figure 2 As shown, in any embodiment, the buffer ring 4 is hemispherical. The difference between this embodiment and other embodiments is that the hemispherical design allows the molten metal to flow from vertical to radial diffusion, reducing the impact on the bottom of the cavity, thereby preventing turbulence during the flow of the molten metal, reducing air entrainment and scouring of the mold shell, and reducing contact with air to reduce oxidation.

[0021] according to Figure 2 As shown, in any embodiment, the connecting platform 3 is tilted downwards, and the tilt angle between the connecting platform 3 and the rod 2 is 60-80 degrees. The difference between this embodiment and other embodiments is that the tilt angle between the connecting platform 3 and the rod 2 is 60-80 degrees, which is beneficial to improving flow stability and feeding efficiency. Too low or too high an angle will affect the flow state of the molten steel and affect the casting quality.

[0022] according to Figure 2 As shown, in any embodiment, a transition arc 6 is provided at the connection between the connecting platform 3 and the rod body 2. The difference between this embodiment and other embodiments is that the transition arc 6 can reduce stress concentration, prevent cracking, and facilitate the flow of molten metal into the casting along the connecting platform 3.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pouring bar with a buffer structure, comprising a pouring cup connecting structure (1), a bar body (2), and a connecting platform (3), wherein the pouring cup connecting structure (1) is located at the upper end of the bar body (2), the bar body (2) is columnar, and the connecting platform (3) is evenly distributed circumferentially on the outer side of the bar body (2), characterized in that, The bottom of the rod (2) is provided with a buffer protrusion (4).

2. The sprue bar with a buffer structure according to claim 1, characterized in that, The bottom of the buffer ring (4) is provided with a bottom protrusion (5).

3. A gate bar with a buffer structure according to claim 1, characterized in that, There are three connecting platforms (3).

4. A gate bar with a buffer structure according to claim 1, characterized in that, The buffer ring (4) is hemispherical.

5. A gate bar with a buffer structure according to claim 1, characterized in that, The connecting platform (3) is tilted downwards, and the tilt angle between the connecting platform (3) and the rod (2) is 60 to 80 degrees.

6. A gate bar with a buffer structure according to claim 1, characterized in that, The connection between the connecting platform (3) and the rod (2) is provided with a transition arc (6).

Images