Extrusion forming device for fluted disc blank of special vehicle

Abstract

The utility model provides a special vehicle fluted disc blank extrusion forming device which is characterized in that a plurality of sand cores are stacked in multiple layers in the vertical direction, and a fluted disc blank is formed in a cavity of each sand core; the cavity of each layer of sand core is provided with a plurality of flow gates; the ingates are communicated and connected with the inner sprues of the sand cores, and the cavities of the sand cores are communicated into a whole through the inner sprues; a dead head is arranged at the uppermost part of the device, is connected to a cavity sprue of the sand core at the topmost layer, and is interconnected and communicated with the ingate; a sprue is designed in the device, the ingates of the sand cores on the bottommost layer converge at the lowest position of the sprue through the bottom runner, and the sprue is higher than the sand cores on the topmost layer and is flush with the dead head. According to the utility model, a plurality of blanks share one upper and lower combined cavity device, and are formed through one-time casting, so that the simultaneous mold filling process of a plurality of products can be ensured, the production efficiency is improved, the defects of sand holes, air holes and the like can be effectively reduced, and the quality of the product blanks is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of steel blank extrusion forming technology, specifically relating to a special vehicle gear disc blank extrusion forming device. Background Technology

[0002] The gear sprocket is a crucial component of the running gear system for special vehicles. It is mounted on the outside of the drive sprocket and meshes with the tracks, driving the vehicle through its interaction with the track system. Because these vehicles are often used in complex road conditions, the gear sprocket is required to possess high mechanical properties. Previously, gear sprockets were formed using a single-piece extrusion casting method to obtain the blank. While the casting process was simple, it was prone to defects such as sand holes, air pockets, and cold shuts. This resulted in low raw material utilization, high labor costs, low production efficiency, and inconsistent product quality. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] This utility model proposes a special vehicle gear disc blank extrusion forming device to solve the technical problem of how to simultaneously fill multiple products, improve production efficiency, effectively reduce defects such as sand holes and air holes, and ensure the quality of product blanks.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, this utility model proposes a special vehicle gear disc blank extrusion forming device. This device stacks multiple sand cores in a vertical direction, forming a gear disc blank in the cavity of each sand core. Each layer of sand core cavity is provided with multiple ingates. The ingates are interconnected with the ingates of each layer of sand core, connecting the cavities of multiple sand cores into one unit. A riser is provided at the top of the device, connected to the ingate of the top layer of sand core cavity, and interconnected with the ingates. The device is designed with a sprue. The ingates of the bottom layer of sand core converge at the lowest point of the sprue through the bottom runner. The height of the sprue is higher than that of the top layer of sand core and is flush with the riser.

[0007] Furthermore, each sand core cavity has six ingates evenly distributed.

[0008] Furthermore, the ingate is a cylindrical pipe distributed along the inner wall of the entire forming device.

[0009] Furthermore, the diameter of the ingate is 50mm.

[0010] Furthermore, the riser is a fan-shaped riser.

[0011] Furthermore, three evenly distributed fan-shaped risers are provided at the top of the device.

[0012] Furthermore, the diameter of the direct sprue is 60mm.

[0013] Furthermore, the sprue includes multiple Y-shaped channels, with the two outer channels of each Y-shaped channel connected to the bottom of the ingate and the inner channel connected to the sprue.

[0014] Furthermore, the gating system includes three Y-shaped channels.

[0015] (III) Beneficial Effects

[0016] This invention proposes a special vehicle gear disc blank extrusion forming device. Multiple sand cores are stacked in multiple layers vertically, with each sand core cavity forming a gear disc blank. Each layer of sand core cavity has multiple ingates. The ingates of each sand core layer are interconnected, linking the cavities of multiple sand cores into a single unit. A riser is located at the top of the device, connected to the gating point of the top sand core cavity and communicating with the ingates. The device also features a sprue; the ingates of the bottom sand core converge at the lowest point of the sprue via the bottom gating, and the sprue is higher than the top sand core and flush with the riser. This invention allows multiple blanks to share a single upper and lower mold cavity, completing the forming process in a single casting. This ensures simultaneous filling of multiple products, improving production efficiency, and effectively reduces defects such as sand holes and porosity, guaranteeing the quality of the finished blanks.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Saves production costs and improves production efficiency. For thinner gear disc parts, this device can complete the forming of multiple castings in a single casting and extrusion process, reducing the consumption of molten steel and molding sand, greatly improving production efficiency and reducing production costs;

[0019] 2. Improve the reliability of extruded castings. This device uses multiple sand cores stacked one on top of the other for production, which greatly increases the height of the extrusion device. Due to the increased pressure of the molten steel during casting, the extrusion pressure increases, thus effectively reducing the generation of porosity defects and resulting in a denser microstructure in the extruded castings.

[0020] 3. Improve the controllability of extrusion casting quality. This device combines small castings weighing 20 kg into medium and large castings weighing 160 kg for casting, thus greatly increasing the casting time. This is more conducive to reducing sand erosion and entrapment defects and improving the quality of blanks. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the internal structure of the toothed disc blank extrusion forming device of this utility model.

[0022] Figure 2This is a front view of the internal structure of the gear disc blank extrusion forming device of this utility model.

[0023] Figure 3 This is a structural diagram of the ingate and sprue in the toothed disc blank extrusion forming device of this utility model;

[0024] Figure 4 This is a structural diagram of the bottom gating system in the toothed disc blank extrusion forming device of this utility model. Detailed Implementation

[0025] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0026] This embodiment proposes a special vehicle gear disc blank extrusion forming device, which uses 32Cr06 as the extrusion forming material of the gear disc. The gear disc structure is a sheet-like ring with 11 evenly distributed teeth on the outside and uniform wall thickness.

[0027] like Figure 1 and 2 As shown, the extrusion molding device of this utility model stacks eight sand cores in multiple layers in the vertical direction, and a toothed disc blank is formed in the cavity of each sand core. Six ingates are evenly distributed in the cavity of each sand core layer. The ingate is a cylindrical pipe with a diameter of 50mm, evenly distributed along the inner wall of the entire molding device. The ingates are interconnected with the ingates of each sand core layer, connecting the cavities of multiple sand cores into a single unit.

[0028] The device has three evenly distributed fan-shaped risers at the top, which are connected to the cavity gate of the top sand core and interconnected with six ingates.

[0029] The device features a 60mm diameter cylindrical sprue. The ingate of the bottom sand core converges at the lowest point of the sprue via the sprue, and the sprue is higher than the top sand core and flush with the riser. The sprue includes three Y-shaped channels: two outer channels connect to the bottom of the ingate, and the inner channel connects to the sprue. Figure 3 and 4 As shown.

[0030] During extrusion molding, molten steel is poured from the bottom up through this device, completing the filling process from bottom to top. Molten steel is poured through a sprue at a temperature of 1540–1560°C. The poured steel flows through the sprue to the bottom gating, then through three Y-shaped bottom gatings to the six ingates of the bottom sand core, filling the bottom sand core cavity. After the bottom layer is completely filled, the back pressure of the cavity forces incoming molten steel back through the ingates to the ingates, flowing upwards along the ingates to the ingate of the next layer of sand core. The filling process continues upwards along this route, finally converging at the top riser to complete the casting. After casting, the composite casting is cleaned using a water-blast sand-cleaning method, and then the multi-layered casting is separated using gas cutting.

[0031] 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 special vehicle sprocket blank extrusion forming device characterized by, The special vehicle gear blank extrusion forming device stacks multiple sand cores in the up-down direction in multiple layers, and forms a gear blank in the cavity of each sand core; the cavity of each layer of sand cores is provided with multiple ingates; the ingates are connected with each other through the ingates of the layers of sand cores, and the cavities of the multiple sand cores are communicated into an integrated whole through the ingates; a riser is arranged at the uppermost position of the device, is connected to the cavity gate of the topmost layer of sand cores, and is interconnected with the ingates; a straight sprue is designed inside the device, the ingates of the bottommost layer of sand cores converge at the lowermost position of the straight sprue through the bottom sprue, and the height of the straight sprue is higher than the topmost layer of sand cores and is flush with the riser.

2. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The cavity of each layer of sand cores is uniformly distributed with six ingates.

3. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The ingate is a cylindrical pipeline distributed on the inner wall of the entire forming device.

4. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The diameter of the ingate is 50 mm.

5. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The shape of the riser is a fan-shaped riser.

6. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 5, wherein Three fan-shaped risers are uniformly distributed at the uppermost position of the device.

7. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The diameter of the straight sprue is 60 mm.

8. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The bottom sprue includes multiple Y-shaped channels, two outer channel openings of each Y-shaped channel are connected to the bottom end of the ingate, and the inner channel opening is connected to the straight sprue.

9. The apparatus for extrusion forming of a special vehicle sprocket blank according to claim 1, wherein The bottom sprue includes three Y-shaped channels.

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