Abstract: An injection mold, including: an insert, a fixed half, a moving half and a core. The fixed half has a first groove and a rubber inlet communicating with the first groove. The moving half is configured for matching with the fixed half, the moving half has a second groove, and the fixed half and the moving half are arranged in layers to form a cavity together by the first groove communicating with the second groove. The core is partially embedded in the second groove and connected to the movable mold, the core has a diameter variable end at least partially located in the cavity. The insert is arranged on an end face of the diameter variable end, a first molding section is formed between the insert and a bottom of the first groove, the first molding section is configured for injection molding the flat portion.

Abstract: The present invention discloses a copper-zinc-aluminum-iron single crystal alloy material having an ultra-large grain structure of 5-50 cm grade, obtained by annealing an as-cast alloy having a polycrystalline structure through a single phase region of 800-960° C. for 2-105 h, where the as-cast alloy includes, by weight percentage, 62-82% of copper, 6-29% of zinc, 5-12% of aluminum, and 2-5% of iron. In the present invention, the alloy compositions have an essential difference and are a copper-zinc-aluminum-iron quaternary alloy, and the iron element is an indispensable alloying element. The preparation process of the present invention is extremely simple and very easy to implement and has a very good application prospect.

Abstract: The present invention discloses a copper-zinc-aluminum-iron single crystal alloy material having an ultra-large grain structure of 5-50 cm grade, obtained by annealing an as-cast alloy having a polycrystalline structure through a single phase region of 800-960° C. for 2-105 h, where the as-cast alloy includes, by weight percentage, 62-82% of copper, 6-29% of zinc, 5-12% of aluminum, and 2-5% of iron. In the present invention, the alloy compositions have an essential difference and are a copper-zinc-aluminum-iron quaternary alloy, and the iron element is an indispensable alloying element. The preparation process of the present invention is extremely simple and very easy to implement and has a very good application prospect.