Reducing piled force-expanding type oil cylinder opening-closing device and using method thereof

Abstract

The invention relates to a reducing piled force-expanding type oil cylinder opening-closing device. In the invention, a short-stroke large-cylinder-diameter flat oil cylinder is connected between a piston rod and a cross arm of a power oil cylinder, wherein the piston rod of the flat oil cylinder is connected with the piston rod of the power oil cylinder, and a close hole end cover of the flat oil cylinder is connected with the cross arm. The using method comprises the following steps of: filling hydraulic oil into an inlet-outlet oil hole of a piston cavity of the flat oil cylinder to ensure that oil enters the piston cavity and the piston rod is in a fixed state; acting on the close hole end cover of the flat oil cylinder by the piston cavity after the oil enters the piston cavity to ensure that the close hole end cover pushes the cross arm and a pull rod pulls a metal die core, wherein because the sectional area of the piston cavity of the flat oil cylinder is an odd number times that of the piston cavity of the power oil cylinder, under the action of several times of pulling force, the metal die core and an outer die of a metal die form a die opening and core pulling distance space; and then filling oil into the piston cavity of the power oil cylinder to finish the overall die opening and core pulling action of the metal mold. The invention is applied to a metal die core pulling and demoulding casting process, reduces the shut-down waste caused by the braking of the metal die core, saves the resources and improves the working efficiency.

Description

technical field [0001] The invention relates to an oil cylinder opening and closing device, in particular to a device for opening and closing a metal mold by a hydraulic oil cylinder used in the casting industry and in the metal mold opening process and a method for using the same. Background technique [0002] At present, in the known hydraulic mold opening process for aluminum alloy metal molds, the metal mold hydraulic cylinder opening and closing device is usually used to determine the stroke length of the hydraulic cylinder based on the mold opening stroke plus the pick-up space, and then tighten it according to the shrinkage of the product blank The hydraulic cylinder opening and closing device is installed at the bottom of the metal mold, In terms of the space position on the side, its structure and use method are as follows: including the cylinder seat, the oil cylinder with the end of the piston rod facing outward is installed on the outside of the oil cylinder seat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a solution that can effectively prevent the metal mold core from being held tightly by the solidification and shrinkage of the metal liquid, so that the mold cannot be opened and the metal mold core cannot be pulled out. Variable-diameter stacked expansion force cylinder opening and closing device capable of ensuring large mold opening force and satisfying long-stroke and small-bore rapid movement and its application method

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