Can cap multi-level composite air pressure reverse mold and forming method

Abstract

The invention discloses a can cap multi-level composite air pressure reverse mold and a forming method. The can cap multi-level composite air pressure reverse mold comprises an upper mold and a lower mold, the upper mold and the lower mold are both of a combined structure formed by stacking a plurality of annular single mold bodies in an inner and outer concentric sleeving mode, the upper mold comprises an upper mold core, a cap striking ring, a male and female mold and a discharging ring from inside to outside in sequence, and the lower mold comprises a lower mold inner core, a lower mold core, an edge pressing ring and a female mold from inside to outside in sequence. Blanking and forward and reverse stretching of can cap materials are achieved to complete formation of can caps by controlling the single mold bodies of different functions to move through air pressure, and thus the thinning amount of the can cap materials is effectively reduced. According to the can cap mold and the can cap forming method, the material deformation is small in the stamping process, the material cost is low, formation of the can cap can be achieved by completing multiple processes at a time, and very high practical value is achieved.

Description

technical field [0001] The invention relates to the technical field of cold stamping dies, in particular to a multi-stage compound air pressure reverse forming die for a can cover and a method for forming the can cover. Background technique [0002] In the metal packaging industry, canned food, beverages and other cans are packaged with a large number of sealed packaging can covers such as bottom covers, top covers or easy-open covers. Production, due to the flow of materials during molding, the material on both sides of the countersunk rib of the can lid is seriously thinned, and the thinning amount is usually between 25% and 28%. After the can is packaged, it is a closed container, and its anti-deformation ability It mainly depends on the thickness of the material at the thinnest part of the material. Therefore, in order to ensure the packaging quality of the can, it is necessary to use a thicker material to make the can lid, resulting in a lot of waste. On the other hand...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the local material becomes seriously thinned during the stamping of the can lid in the prior art, and it is necessary to use a thicker material to make the can lid, resulting in a lot of waste, and the prior art has many processing steps during the stamping of the can lid , the problem of high processing cost, to provide a can lid multi-stage composite air pressure reverse forming die with less material deformation during can lid stamping, low material cost, one-time molding, and convenient processing

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