Heavy die preheating furnace bottom for multidirectional double-acting extrusion hydraulic press and die loading and unloading method

Abstract

The invention discloses a heavy die preheating furnace bottom for a multidirectional double-acting extrusion hydraulic press and a die loading and unloading method. The heavy die preheating furnace bottom is characterized in that sealing of mechanical labyrinth type sealing plus refractory fiber banded block sealing is adopted between the periphery of the furnace bottom and a furnace body; the lower side of the furnace bottom is provided with two rows of wheels which runs on two transverse rails fixed to the ground; a refractory fiber layer is laid on the upper surface of the furnace bottom and is provided with crisscross pad beams; the crisscross pad beams are provided with die transverse positioning keys and longitudinal positioning keys respectively; the positions, close to the two edges, of the lower side of the furnace bottom are symmetrically provided with racks to be engaged with gears of motor-gear transmission devices respectively; and the racks are driven by the corresponding gears to walk on the rails with the furnace bottom together. For the heavy die preheating furnace bottom, the sealing performance between the furnace bottom and the furnace body is good, and a die preheating temperature is uniform; automatic operation of die loading and unloading is realized, positioning is accurate, transportation is fast, the loading and unloading time is short, the efficiencyis high, the die temperature drop is reduced, and the service life of a die is prolonged; and heavy labor intensity of manual hoisting is avoid.

Description

Technical field [0001] The invention relates to a furnace bottom of a heavy die preheating furnace of a multi-directional double-action hydraulic extrusion press and a die loading and unloading method, belonging to the technical field of metal plastic forming hydraulic presses. Background technique [0002] The die of a large-scale die forging hydraulic press or a multi-directional double-action extrusion hydraulic press is a tool used to form precision workpieces. It is a process for forming the shape of metal materials and changing its mechanical properties. It is known as the "mother of industry". When working, it is necessary to preheat the mold to a certain temperature, and then put the heated metal material into it for die forging or extrusion. [0003] The simplest die forging is an upper or lower integral die, and the more complicated one is a combined die, or includes a punch and ejector pin. The multi-directional double-action extrusion die is more complicated. When the ...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the assembly / disassembly of the molds of large-scale die forging hydraulic presses is carried out manually by means of spreaders. The mold preheating is generally carried out after installation in the machine. The red-hot steel blocks are preheated between the upper and lower molds; some are preheated in the preheating furnace outside the machine, and the mold is hoisted on the mobile workbench by means of driving and lifting, and installed manually; some use a mold changing trolley Transport the mold, but the preheating and lifting are still carried out by driving

The assembly, preheating and replacement methods of these molds are relatively backward, the preheating temperature is very uneven, the mold replacement / disassembly is labor-intensive and low in efficiency, and cannot adapt to the productivity requirements of large-scale large-scale continuous forging production lines. It cannot adapt to the preheating and quick replacement requirements of heavy molds with a weight of more than 100t

There is no precedent for the simultaneous replacement of vertical and horizontal double-action molds for small-batch, multi-variety large-scale multi-directional double-action composite extrusion hydraulic presses.

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