Punch for high vacuum die-casting and lubricating device for the punch

Abstract

The invention discloses a punch for high-vacuum die casting. The punch for high-vacuum die casting comprises a punch body, an ejection rod provided with an axial through hole and a punch ejection rod threaded connecting piece provided with an axial center through hole, wherein an axial center through hole in a certain depth is formed in one end of the punch body and serves as a cooling chamber, the ejection rod is arranged coaxial with the punch body in an opposite mode, the other opposite end is connected with a driving component, the punch ejection rod threaded connecting piece is arranged between the punch body and the ejection rod, the two ends of the punch ejection rod threaded connecting piece are fixedly connected with the end of the punch body and the end of the ejection rod respectively, and a water cooling pipe used for providing cooling water penetrates through the center through hole of the ejection rod and the center through hole of the punch ejection rod threaded connecting piece and is communicated with a center through whole of a threaded water groove piece. The invention further discloses a lubrication device for the punch. According to the lubrication device, the punch and a pressure chamber can be effectively sealed, and the punch can be well lubricated and cooled through spraying lubrication of the ejection rod and a water cooling circulation system, so that the service life of the punch and the service life of the pressure chamber are prolonged, the frequency for replacement of punches is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of die casting, in particular to a punch for vacuum die casting and a lubricating device for the punch. Background technique [0002] Die casting, referred to as die casting, is to pour molten or semi-molten metal into the pressure chamber of the die casting machine, and the punch presses the metal into the cavity of the mold at a very high speed, and then the molten metal is rapidly solidified under high pressure. A casting method. Die-casting has a short forming cycle and high production efficiency, but due to the fast filling speed of molten metal, the gas in the mold cavity cannot be removed in time, resulting in inevitable pores inside the casting, which greatly affects the mechanical properties and internal quality of the casting, limiting The application fields of die castings. [0003] In order to avoid pore defects inside the casting, it is an effective solution to pump out the gas in the mold cav...

AI Technical Summary

Problems solved by technology

In high vacuum die-casting, when the vacuum system evacuates the pressure chamber and mold cavity, external air can enter the pressure chamber and mold cavity through this gap, resulting in air hole defects

Therefore, ordinary injection punches have poor sealing performance and cannot meet the requirements of high vacuum die casting

In addition, in order to reduce the friction between the punch and the pressure chamber and prolong the service life of the punch, in the normal production process, lubrication is required between the pressure chamber and the punch. It is easy to produce organic volatiles, pollute the aluminum liquid and enter the cavity to produce pore defects

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