Variable-section-thickness sheet hot roll forming method of vertical type hydraulic machine

Abstract

The invention relates to a variable-section-thickness sheet hot roll forming method of a vertical type hydraulic machine. The method includes the following steps that (1) discharging is carried out, (2) a heat cycle heating furnace is used for heating a blank to about 470 DEG C, then heat preservation is carried out for about 4 h, a sheet hot roll forming device is installed on a press, then an alcohol blast burner is used for heating roller shafts so that the temperature of the roller shafts can rise to about 300 DEG C, a clamp is used for manually feeding the heated blank into v grooves between the roller shafts, and positioning of the blank is completed; and (3) the hydraulic machine drives a rack to move from top to bottom, the roller shafts generate rotation motion through the meshing effect of the rack and a gear, positioned sheets rotate along with the roller shafts, the ends of the sheets are meshed in, along with continuous rolling, the press amount is increased continuously, rolling pieces are gradually converted into unstable rolling stages from the meshed-in process, the stable rolling stage is further achieved, and finally the needed rolling piece are rolled. The comprehensive mechanical property is improved, and the problem that the machining piece is insufficient in strength is solved.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to a hot roll forming method for a thin plate with variable cross-section thickness of a vertical hydraulic press. Background technique [0002] For the forming of thin plate parts (such as blades, wings, etc.), when they are produced by extrusion, due to their large cross-section and irregular shape, the contact area between the mold and the blank will also be large during the extrusion process. , so the required forming pressure is relatively high, and the local area is also prone to common extrusion defects such as filling dissatisfaction and folding. Not only that, the larger extrusion force makes the mold suffer from greater stress during the extrusion process, which greatly reduces the life of the mold; when the extrusion forming method is used to produce thin plate parts, due to the action of the blank material The bottom is freely filled into the cavity of the concave mod...

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Problems solved by technology

[0003] The object of the present invention is to aim at the defects and insufficiencies of the prior art, to provide a vertical hydraulic press with simple structure, reasonable design, and easy-to-use hot roll forming method for thin plates with variable cross-section thickness, so as to solve the problem of using vertical extruders to produce thin plates. problems in parts, and improve the comprehensive mechanical properties of parts, especially the strength in the rolling direction has been significantly improved, effectively solving the problem of insufficient strength of machined parts; in addition, compared with the traditional numerical control processing technology of the thin plate parts , the new process improves the utilization rate of materials, reduces the overall production cost, realizes energy saving and consumption reduction, and improves the production efficiency of thin plate parts to a certain extent

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