Forming method of moulding hollow case capable of being installed with built-in component

Abstract

The invention provides a forming method of a moulding hollow case capable of being installed with a built-in component. In the feeding step, an extrusion head is used to extrude a tubular plasticizing parison; in the performing step, the extruded tubular plasticizing parison is used to prepare a preformed parison by blowing half moulds or sucking air, a cutting device is used to cut the preformed parison to divide the preformed parison into two preformed semi-shells; in the built-in component-installing process, the half moulds are opened, a lifting device is used to pushing a built-in mechanism with the built-in component in the middle of the two half moulds to connect the component with the inner surface of the preformed semi-shells; and in the forming process, the half moulds are closed to mould the preformed semi-shells with the built-in component into a hollow case. The forming method of the invention can be used to ensure to simplify the steps of the production method, effectively reduce the acquisition cost of the extrusion head device of the parison and the cost of the single piece and increase the production efficiency by using the cutting device.

Description

technical field [0001] The invention relates to a molding method of a molded hollow box, in particular to a molding method of a molded hollow box with built-in components. Background technique [0002] Automobile plastic fuel tank blow molding has been widely recognized by customers for its light weight, good safety performance, corrosion resistance, impact resistance, long service life and large design freedom. Due to the increasingly stringent evaporative emission requirements, higher requirements are placed on fuel tank materials and structures, and the 6-layer co-extrusion technology with fuel barrier layer (EVOH) is the mainstream technology of plastic fuel tanks today. With the increasing awareness of environmental protection, relevant policies and regulations have put forward strict requirements for automobile OEMs. For example, California, the United States has introduced the PZEV (PZEV) regulations, which are for plastic fuel tanks produced by mainstream technologie...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve this goal, innovation in production technology is required. Recently, many international large-scale plastic fuel tank manufacturers have made breakthroughs in this technology. For example, INSHELL technology mainly adopts welding surface to cover multi-layer boards, and the pipeline is integrated inside the fuel tank. , to further reduce the gasoline penetration on the welding surface, but it requires laser welding technology, which greatly increases the investment cost of equipment tooling; at the same time, there are also SIB and ICS technologies, which integrate components inside the box to reduce openings, and use "fuel tank sleeves" The method of "fuel tank" reduces the penetration of gasoline, and this method also leads to a substantial increase in the cost of a single product; in addition, a flat sheet-shaped parison is formed through an extrusion process, and a special mold is used for production, which also has low production efficiency, The problem of high product unit cost and high equipment cost

Images