A method and device for forming by internal pressure expansion and reverse deep drawing

Abstract

The invention discloses a forming device based on internal compressive expansion and reserve deep drawing. The device comprises a base with a built-in cavity, wherein shafts penetrate through the samepositions of the opposite sides of the base, the end, located in the base, of each shaft is connected with a rack, an upper die is connected between the two racks, a lower die is connected between the two racks, the top of the upper die and the top of the lower die is respectively provided with a hole, the upper die and the lower die are connected with the same fluidized medium pressure transmission system through the holes, and the fluidized medium pressure transmission system is connected with a pressure pump. In the process, a blank is cast just now, its internal material does not solidifycompletely, blank reheating is not needed, and energy is saved. Different dies are selected and installed according to different demands, and installation is rapid. The device also has the advantagesof being simple in structure and convenient to use. By adopting a method based on internal compressive expansion and reserve deep drawing, the pressure requirement for the device is low, and blanks are uniform in deformation stress and easy to form.

Description

technical field [0001] The invention belongs to the technical field of plastic forming equipment, and in particular relates to an internal compression expansion type and reverse deep drawing forming device, and also relates to an internal compression expansion type and reverse deep drawing forming method. Background technique [0002] Pressure vessels are important equipment in petroleum, chemical, energy and other industries. With the development of my country's social economy, pressure vessels in nuclear power, coal chemical industry, oil refining, petrochemical, military and other industries are showing a trend of large-scale development, especially large With the appearance of hydrogenation reactors with large diameter and large wall thickness, coal liquefaction reactors, nuclear reactor shells, etc., large-scale heads have emerged as the times require. In order to ensure long-term high-efficiency operation of equipment under high temperature and high pressure, the size o...

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Problems solved by technology

The traditional head forming method includes the overall forging method, which has extremely high requirements for large-scale forging equipment and technology; the stamping method, which is prone to scratches, scratches, and large areas of packaging; the spinning method , it has the advantages of small tonnage of required equipment, low processing cost, flexible process, wide range of forming, etc. However, it is very easy to cause slab instability and wrinkling, and it is difficult to meet the manufacturing requirements of large thick-walled heads; split-flap combined welding forming method , it can use a smaller tonnage press to form a larger-sized head, but it has the disadvantages of head piece design, complicated calculation and blanking, long process route, difficult to guarantee weld quality, and the need for overall heat treatment; explosive forming method, its characteristic is that it does not require complex large-scale equipment and complex molds, but the disadvantage is that it is dangerous and the shape of the molding is irregular

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