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CN-121988718-A - Ultrathin magnesium alloy die-casting forming device and process thereof

CN121988718ACN 121988718 ACN121988718 ACN 121988718ACN-121988718-A

Abstract

The invention relates to the technical field of magnesium alloy die casting, in particular to an ultrathin magnesium alloy die casting forming device and a process thereof, wherein the ultrathin magnesium alloy die casting forming device comprises a die core, a central feeding pipe is communicated with the central position of the die core, the end part of the central feeding pipe is communicated with a hot runner main pipe, a plurality of hot runner branch pipes connected with the product body are communicated with the hot runner main pipe, and the hot runner branch pipes are distributed along the central line of the product body. Compared with the prior art, in the technical scheme provided by the invention, the flow distance of the magnesium liquid is shortened through the plurality of hot runner branch pipes distributed along the center line of the product body, so that the magnesium liquid is rapidly and uniformly filled, the problem of large temperature difference between the feeding end and the tail end caused by conventional side feeding is solved, and the molding defect rate is reduced.

Inventors

  • Hu Xiaoliu
  • QIAN JIANFENG

Assignees

  • 安徽胜利精密制造科技有限公司

Dates

Publication Date
20260508
Application Date
20260311

Claims (9)

  1. 1. The die-casting forming device for the ultrathin magnesium alloy is characterized by comprising a die core (1), wherein a central feeding pipe (6) is communicated with the central position of the die core (1), a hot runner main pipe (5) is communicated with the end part of the central feeding pipe (6), a plurality of hot runner branch pipes (4) connected with a product body (3) are communicated with the hot runner main pipe (5), and the hot runner branch pipes (4) are distributed along the central line of the product body (3).
  2. 2. The die casting device for ultra-thin magnesium alloy according to claim 1, wherein the plurality of hot runner sub-pipes (4) are arranged along a center line in a length direction of the product body (3).
  3. 3. The ultrathin magnesium alloy die-casting forming device according to claim 1, wherein the die core (1) is provided with a heating pipe (2) for ensuring that magnesium liquid in the hot runner is always in a molten flow state.
  4. 4. The apparatus of claim 3, wherein a plurality of said heat generating pipes (2) are provided, and wherein a plurality of said heat generating pipes (2) are uniformly provided along a circumferential direction of said main hot runner pipe (5).
  5. 5. The ultrathin magnesium alloy die-casting forming device according to claim 1, wherein the end part of the hot runner branched pipe (4) is provided with a back-off needle (7), and the expansion and contraction direction of the back-off needle (7) is consistent with the demoulding direction.
  6. 6. A molding process suitable for the die-casting molding device of an ultrathin magnesium alloy as claimed in any one of claims 1 to 5, characterized by comprising the following steps: s1, preheating a die core (1), and keeping the temperature constant after the preheating is finished; S2, starting a heating tube (2), and heating the interior of the hot runner main body to 600 ℃ by the heating tube (2) and keeping the temperature constant; s3, injecting molten magnesium alloy liquid at high pressure through a central feeding pipe 6, and flowing the molten magnesium alloy liquid onto the product body (3) through a main hot runner pipe (5) and a branch hot runner pipe (4); s4, after the magnesium alloy liquid is preliminarily solidified and formed, the back-off needle (7) stretches out to rapidly stretch off the die casting, and burr-free separation of the die casting and the hot runner is completed.
  7. 7. The molding process according to claim 6, wherein the mold core (1) is preheated in synchronous partition, and the temperature of the mold core (1) is preheated to 280-300 ℃.
  8. 8. The molding process according to claim 7, wherein the mold core (1) is preheated in a synchronized zone by means of electric heating.
  9. 9. The molding process of claim 8, wherein the minimum temperature of the metal is greater than 592 ℃ and the cavity filling rate is greater than 99.7%.

Description

Ultrathin magnesium alloy die-casting forming device and process thereof Technical Field The invention relates to the technical field of magnesium alloy die casting, in particular to an ultrathin magnesium alloy die casting forming device and process. Background Magnesium alloy is widely used because of the advantages of small density, high specific strength, good thermal conductivity and the like, and ultrathin magnesium alloy die castings become core components of lightweight products. However, the ultra-thin magnesium alloy die casting has the defects of insufficient filling, cold insulation, flow marks and the like easily caused by extremely small wall thickness, high magnesium liquid cooling speed and low product yield in the die casting molding process, and is difficult to meet the industrial production requirement. In the existing ultrathin magnesium alloy die casting process, the temperature distribution of each area of a die is uneven, the far-end temperature attenuation is obvious, the temperature difference between the die and magnesium liquid is large, the magnesium liquid is fast solidified in the flowing process, the complete filling of a cavity cannot be realized, meanwhile, a conventional pouring system adopts a side feeding mode, the magnesium liquid flowing distance is long, the temperature difference between a feeding end and a tail end is large, the forming difficulty is high, and the quality is difficult to control. Disclosure of Invention The invention aims to solve the problem of high molding difficulty in the existing ultrathin magnesium alloy die-casting process, and provides an ultrathin magnesium alloy die-casting molding device, which is used for casting from a central position through a hot runner, so that the flow distance of magnesium liquid is shortened, and the molding defect rate is reduced. In order to achieve the above purpose, according to one aspect of the present invention, there is provided an ultrathin magnesium alloy die casting molding device, including a die core, wherein a central feeding pipe is disposed in communication with a central position of the die core, a hot runner main pipe is disposed in communication with an end portion of the central feeding pipe, and a plurality of hot runner sub pipes connected with a product body are disposed in communication on the hot runner main pipe, and the plurality of hot runner sub pipes are arranged along a central line of the product body. Preferably, a plurality of the hot runner sub-pipes are arranged along a center line in a length direction of the product body. Preferably, a heating pipe is arranged on the die core to ensure that the magnesium liquid in the hot runner is always in a molten flow state. Preferably, a plurality of heating pipes are provided, and the plurality of heating pipes are uniformly provided along the circumferential direction of the hot runner main pipe. Preferably, the end part of the hot runner branch pipe is provided with a back-off needle, and the expansion direction of the back-off needle is consistent with the demoulding direction. The invention also provides a molding process suitable for the ultrathin magnesium alloy die-casting molding device, which comprises the following steps of: s1, preheating a die core, and keeping constant temperature after preheating is finished; s2, starting a heating pipe, wherein the heating pipe heats the temperature inside the hot runner main body to 600 ℃ and keeps the temperature constant; s3, injecting molten magnesium alloy liquid at high pressure through a central feeding pipe 6, and flowing the molten magnesium alloy liquid onto a product body through a main hot runner pipe and a branch hot runner pipe; s4, after the magnesium alloy liquid is initially solidified and formed, the back-off needle stretches out to rapidly break the die casting, and burr-free separation of the die casting and the hot runner is completed. Preferably, the mould core is preheated synchronously and in a partition mode, and the temperature of the mould core is preheated to 280-300 ℃. Preferably, the mold core is preheated in a synchronous partition manner by means of electric heating. Preferably, the minimum temperature of the metal is greater than 592 ℃ and the cavity filling is greater than 99.7%. Compared with the prior art, in the technical scheme provided by the invention, the flow distance of the magnesium liquid is shortened through the plurality of hot runner branch pipes distributed along the center line of the product body, so that the magnesium liquid is rapidly and uniformly filled, the problem of large temperature difference between the feeding end and the tail end caused by conventional side feeding is solved, and the molding defect rate is reduced. Drawings The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for purposes of illustration only and are not intended to limit