Full sealing thermal type vacuum die-casting die assembly

Abstract

The invention discloses a full sealing thermal type vacuum die-casting die assembly, which comprises a die consisting of a moving die and a fixed die, a pushing mechanism, a cooling system and a pouring system are arranged on the die, the die is provided with a vacuumizing hole passage communicated with the cavity of the die, a sealing box is additionally arranged outside the die, the sealing box is formed by docking a sealing front cover and a sealing rear cover to cause the die to be positioned in an airtight space of the sealing box, and the sealing box is provided with a bleeder hole communicated with the airtight space, so that the die is positioned in a vacuum environment after vacuumizing is performed through the bleeder hole; ports, positioned in the die, of the outer parts of the pushing mechanism, the cooling system and the pouring system extend to and penetrate through the sealing box. According to the full sealing thermal type vacuum die-casting die assembly, the vacuum degree in the cavity of the die is obviously improved, mobility of molten metal or plastic liquid in the cavity of the die is accelerated, tiny gaps between the casting thimble of a casting machine and the hole wall of a thimble hole in the moving die are in the vacuum state, no airflows impact the molten metal or plastic liquid in the cavity of the die, no oxidation occurs and product quality is improved.

Description

technical field [0001] The invention relates to a vacuum die-casting mold, in particular to a fully sealed thermal vacuum die-casting mold assembly. Background technique [0002] The vacuum die-casting process is an advanced die-casting process that eliminates or significantly reduces the pores and dissolved gases in the die-casting parts by removing the gas in the die-casting mold cavity during the die-casting process, thereby improving the mechanical properties and surface quality of the die-casting parts. [0003] The vacuum die-casting process has the following advantages: ①Simple process, convenient operation, almost the same production efficiency as ordinary die-casting methods, and easy to promote in actual production; ②It can eliminate or reduce the pores inside the die-casting parts, improve the mechanical properties and The surface quality improves the coating performance; ③The back pressure of the cavity is greatly reduced, alloys with lower specific pressure and ...

AI Technical Summary

Problems solved by technology

[0005] (1) After vacuuming the mold cavity, due to the incomplete discharge of the gas in the mold, the vacuum degree cannot meet the requirements, so that the fluidity of the molten metal or plastic liquid in the mold cavity is poor, resulting in shrinkage cavity and other quality of the metal casting defect

[0006] ⑵The small gap between the casting thimble and the moving mold of the die-casting machine communicates with the outside world, and the external airflow will impact the molten metal or plastic liquid in the mold cavity, causing oxidation, thus affecting product quality

[0007] (3) After vacuuming the mold cavity, the residual gas will continue to overflow, resulting in the overflow of molten metal, resulting in unqualified quality of metal castings

[0008] (4) For a mold with good sealing performance, after vacuuming, the mold cavity can maintain a high degree of vacuum. However, the sealing performance of the mold is directly related to its material, and its material requirements are high. Moreover, the mold sealing structure is complex, and manufacturing and installation More difficult and therefore more expensive

[0009] ⑸A vacuum tube is installed on the mold cavity, and the molten metal liquid or plastic liquid is easy to block the vacuum tube. When it is used again, it needs to be cleaned, which is very inconvenient to use

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