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CN-122007373-A - Forming die and forming process for inner and outer elbows of bus duct

CN122007373ACN 122007373 ACN122007373 ACN 122007373ACN-122007373-A

Abstract

The invention relates to the technical field of power distribution equipment manufacture and discloses a forming die and a forming process for an inner elbow and an outer elbow of a bus duct, wherein the forming die comprises an upper die and a lower die, a sealed cavity with an inner elbow forming area and an outer elbow forming area is formed by die assembly, the lower die is provided with a pouring opening, a pouring head and a feeding flow path formed by a straight runner, the pouring head is provided with a slope inclining downwards, the straight runner is provided with a multi-stage buffer part, the tail end of the cavity is communicated with an overflow tank, the tail end of the straight runner is provided with a split flow structure, and the forming process comprises die assembly liquid injection, slope guiding metal liquid layering, multi-stage buffer steady flow, split flow synchronous filling of the cavity, gas slag discharging into the overflow tank, cooling die opening and component taking. According to the invention, through the cooperative design of the flow path structure and the forming process, steady flow conveying and pure filling of molten metal are realized, so that the defects of casting air holes and slag inclusion are reduced, the forming quality and the size consistency of the bus duct elbow are improved, and the production efficiency and the product reliability of the distribution equipment connector are improved.

Inventors

  • ZHU HENGLIN
  • ZHU HELIN
  • Yuan Jiantang

Assignees

  • 广东谷菱电气有限公司

Dates

Publication Date
20260512
Application Date
20260309

Claims (10)

  1. 1. The bus duct inner and outer elbow forming die is characterized by comprising an upper die (1) and a lower die (2), wherein a sealed cavity (3) is formed after the upper die (1) and the lower die (2) are closed, and the cavity (3) comprises an inner elbow forming region (31) and an outer elbow forming region (32); The upper die (1) and the lower die (2) are matched to form a feeding flow path, the feeding flow path sequentially comprises a pouring opening (4), a pouring head (5) and a straight pouring channel (6), the pouring opening (4) is arranged on the upper die (1) and is communicated with the outside of the die, the pouring head (5) and the straight pouring channel (6) are arranged on the top of the lower die (2), the tail end of the pouring opening (4) is communicated with the straight pouring channel (6) through the pouring head (5), and the straight pouring channel (6) extends and is communicated to an inlet of the cavity (3); The bottom surface of the pouring head (5) is provided with a height difference structure, the height difference structure forms a slope (51) which is inclined downwards along the flowing direction of the metal liquid, one end of the slope (51) is connected with the pouring opening (4), and the other end of the slope (51) is connected with the starting end of the straight pouring channel (6); A buffer part (61) is arranged on the extending path of the sprue (6), and the buffer part (61) is positioned at the downstream side of the slope (51) and at the upstream side of the inlet of the cavity (3).
  2. 2. The forming die for the internal and external elbows of the bus duct according to claim 1, wherein the buffer part (61) is configured into a cavity structure which is recessed in the bottom surface or the side wall of the sprue (6), and the depth of the cavity structure is larger than that of the junction of the sprue (6) and the cavity (3).
  3. 3. The bus duct inner and outer elbow forming die according to claim 1, wherein overflow tanks (7) are respectively communicated with the end positions of the inner elbow forming region (31) and the outer elbow forming region (32) far away from the sprue (6); The overflow groove (7) is communicated with the cavity (3) through an overflow port, and the tail end of the overflow groove (7) is connected with an exhaust groove extending to the outside of the die.
  4. 4. The forming die for the internal and external elbows of the bus duct according to claim 2, wherein the number of the buffer parts (61) is at least 4, and the 4 buffer parts (61) are arranged at intervals along the length direction of the sprue (6).
  5. 5. The forming die for the internal and external elbows of the bus duct according to claim 3, wherein rib forming positions are arranged in the cavity (3), the overflow groove (7) is arranged at the junction of the rib forming positions and at the metal liquid filling end of the cavity (3) far away from the feeding flow path, and the volume of the overflow groove (7) is configured to contain the head metal liquid flowing in from the cavity (3).
  6. 6. The bus duct inner and outer elbow forming die according to claim 1, wherein the inner elbow forming region (31) and the outer elbow forming region (32) are symmetrically distributed by taking the central line of the sprue (6) as a symmetrical axis; And the tail end of the straight pouring channel (6) is provided with a diversion structure which is respectively led to the inner pouring gate of the inner elbow forming area (31) and the inner pouring gate of the outer elbow forming area (32).
  7. 7. The forming die for the internal and external elbows of the bus duct according to claim 1, wherein the surface of the slope (51) is a smooth transition surface, and the slope (51) connects the plane where the pouring head (5) is located with the plane where the sprue (6) is located to form a step-shaped structure.
  8. 8. The forming die for the internal and external elbows of the bus duct according to claim 1, wherein the upper die (1) is provided with matching surfaces corresponding to the pouring head (5) and the sprue (6), and when the upper die (1) and the lower die (2) are closed, the matching surfaces of the upper die (1) and the pouring head (5), the sprue (6) and the buffer part (61) of the lower die (2) jointly enclose a closed metal liquid flow path.
  9. 9. The forming die for the internal and external bends of a bus duct according to claim 2, characterized in that the sectional area of said buffer portion (61) is larger than the sectional area of the non-buffer portion area of said sprue (6).
  10. 10. A process for forming a bus duct inner and outer elbow forming die, which is applied to the bus duct inner and outer elbow forming die as claimed in any one of claims 1 to 9, and comprises the following steps: closing the upper die (1) and the lower die (2) to form a sealed cavity (3), and injecting metal liquid into the die through a pouring opening (4); The injected metal liquid enters the position of the pouring head (5), flows downwards along the slope (51) and enters the sprue (6), and the metal liquid is guided to flow in a layered manner by utilizing a height difference structure, so that the cold-polluted metal with larger gravity is retained at the bottom layer of the flow path; the metal liquid entering the sprue (6) sequentially flows through 4 buffer parts (61) arranged in the sprue, fills the cavity of the buffer parts (61) and then continuously flows towards the cavity (3); the metal liquid flowing through the buffer part (61) synchronously fills the inner elbow forming area (31) and the outer elbow forming area (32) through the flow dividing structure; in the filling process, air, volatile gas and cold dirty metal liquid positioned in the cavity (3) are pushed to the tail end of the cavity (3) and are discharged into the overflow groove (7) through the overflow port; after the metal liquid is cooled and solidified in the die casting mold, the upper mold (1) and the lower mold (2) are opened, and the molded product containing the inner elbow and the outer elbow of the bus duct is taken out.

Description

Forming die and forming process for inner and outer elbows of bus duct Technical Field The invention relates to the technical field of power distribution equipment manufacturing, in particular to a bus duct inner and outer elbow forming die and a forming process. Background The bus duct is used as a high-efficiency power transmission and distribution device, is widely applied to power supply systems of modern high-rise buildings and industrial facilities, the inner and outer elbows of the bus duct are used as key conductive and structural components for connecting the straight line sections of the bus duct and realizing line steering, and aluminum alloy or copper alloy materials are generally integrally formed through a die-casting process, so that the die-casting process has the characteristics of high production efficiency, good dimensional consistency and the like, and is a main processing mode for manufacturing special-shaped metal connecting pieces at present. The existing bus duct elbow die-casting die generally comprises a movable die and a fixed die, during die-casting production, molten metal liquid is injected through a feed inlet of the die through a jet-casting system, is guided by a runner system and then is filled into a cavity, and is cooled and solidified in a pressure-maintaining state to obtain a product, the conventional die runner design is focused on shortening the filling time, and a sprue gate and the cavity are directly connected by a straight-through runner or a simple split-flow structure, so that the elbow cavity with a complex shape can be ensured to be filled with the molten metal rapidly. Because the direct current channel of the conventional die lacks an effective buffering and steady flow structure, high-temperature molten metal directly impacts the inlet of the die cavity at extremely high speed under the action of injection pressure, so that the molten metal is in a state of intense turbulence and splashing, the air in the channel or the die cavity is easily involved in the molten metal in a state of intense turbulence, and air holes or pinhole defects are formed after castings are cooled, meanwhile, because the conventional pouring system lacks a physical isolation design for cold-contaminated metal and oxide skin, cold materials and impurities at a molten metal flow head directly enter a bus duct elbow forming area along with the main fluid, the density of the internal structure of a product is reduced due to the fact that the impurities are mixed, cold partitions or slag inclusions are formed on the surface of the castings, and the conductivity and mechanical strength of the bus duct elbow are seriously affected. Disclosure of Invention The invention aims to provide a forming die and a forming process for an inner elbow and an outer elbow of a bus duct, which solve the problems that a straight runner of a conventional die has no effective buffering steady flow structure, so that turbulent flow of molten metal is coiled to form air holes, and a pouring system lacks a cold pollution metal and oxide scale isolation design to cause product defects and performance damage. In order to achieve the above purpose, the invention is realized by the following technical scheme: The bus duct inner and outer elbow forming die comprises an upper die and a lower die, wherein a sealed cavity is formed after the upper die and the lower die are closed, and the cavity comprises an inner elbow forming area and an outer elbow forming area; The upper die and the lower die are matched to form a feeding flow path, the feeding flow path sequentially comprises a pouring opening, a pouring head and a straight pouring channel, the pouring opening is formed in the upper die and is communicated with the outside of the die, the pouring head and the straight pouring channel are arranged at the top of the lower die, the tail end of the pouring opening is communicated with the straight pouring channel through the pouring head, and the straight pouring channel extends and is communicated to the inlet of the cavity; the bottom surface of the pouring head is provided with a height difference structure, the height difference structure forms a slope which is inclined downwards along the flowing direction of the metal liquid, one end of the slope is connected with the pouring port, and the other end of the slope is connected with the starting end of the sprue; A buffer part is arranged on the extending path of the sprue and is positioned at the downstream side of the slope and at the upstream side of the cavity inlet Preferably, the buffer part is configured as a cavity structure recessed in the bottom surface or the side wall of the sprue, and the depth of the cavity structure is greater than that of the junction of the sprue and the cavity. Preferably, the positions of the tail ends of the inner elbow forming area and the outer elbow forming area, which are far away from the sprue, are respectively communicate