Core pulling vacuum valve for die casting and application method thereof

Abstract

The invention relates to the field of pressure casting of aluminum base alloys, in particular to a core pulling vacuum valve for die casting and an application method thereof. The core pulling vacuum valve for die casting comprises a movable module (1) and a valve rod (2), and is characterized by further comprising a valve head (3), a pressing block (4), a back base (5), an oil cylinder bracket (6), a connecting block (7) and an oil cylinder (8); the valve rod (2) is arranged in a pipe (11); the valve head (3) is provided with a connecting hole and an air extracting hole (31) communicating with the connecting hole; a back rod of the valve rod (2) is sleeved in the connecting hole of the valve head (3); a front rod of the valve rod (2) is provided with an exhaust port; and the back rod of the valve rod (2) is butted against the wall of the connecting hole of the valve head (3) through the pressing block (4). The application method of the core pulling vacuum valve for die casting is characterized by being performed according to the following steps: die casting preparation; pressing injection; cooling mold opening; and reuse. The core pulling vacuum valve for die casting is large in exhaust section area and high in casting quality.

Description

technical field [0001] The invention relates to the field of die-casting of aluminum-based alloys, in particular to a core-pulling vacuum valve for die-casting and a method for using the same. Background technique [0002] Generally, the die-casting mold does not have an exhaust mechanism, and the exhaust thickness of the exhaust structure is also very limited, such as an exhaust groove with a thickness of only 0.1mm, or a cooling block with a thickness of only 0.6mm, and the exhaust volume is limited. The gas in the cavity is difficult to discharge, which can easily affect the internal quality of the casting. [0003] To achieve large displacement exhaust, a large diameter vacuum valve must be used. There are currently two types of vacuum valves. One type of vacuum valve needs to be closed in advance before the high-speed injection of die-casting. In this case, the smoke generated during the filling process cannot be eliminated; the other type of vacuum valve relies on alu...

AI Technical Summary

Problems solved by technology

There are currently two types of vacuum valves. One type of vacuum valve needs to be closed in advance before the high-speed injection of die-casting. In this case, the smoke generated during the filling process cannot be eliminated; the other type of vacuum valve relies on aluminum Liquid high-speed impact to achieve closure, the center line of the valve stem is parallel to the direction of mold opening, this kind of valve can achieve demoulding by itself, but because the impact direction of aluminum is perpendicular to the closing direction, it often cannot be closed normally, resulting in failure of aluminum liquid pouring

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