Special forging and pressing mold for cylinder barrel in hydraulic support of coal mine and forging and pressing method

Abstract

The invention relates to a special forging and pressing mold for a cylinder barrel in a hydraulic support of a coal mine and a forging and pressing method. The mold comprises a first forging mold, a second forging mold and a final forging mold. The first forging mold comprises a first forging terrace die and a first forging concave die; the first forging terrace die comprises an upper die fixing plate I, the bottom of the upper die fixing plate I is connected to a punch through a punch supporting seat, and a punch I is mounted in the punch supporting seat and a pressure head in a penetrating manner; the first forging concave die comprises a lower die fixing plate I, an ejecting head is arranged in the middle position of the top of the lower die fixing plate I, and the bottom of the ejecting head I is connected to an ejector rod I mounted in the middle position of the lower die fixing plate I in a penetrating manner. The special forging and pressing mold provided by the invention has the advantages of being reasonable in structural design, low in cost, high in integral density, good in metallographic structure, small in margin, raw material-saving and high in strength and capable ofachieving waste heat tempering and integrally forming an outer cylinder barrel.

Description

technical field [0001] The invention belongs to the technical field of production of an outer cylinder of a coal mine hydraulic support, and in particular relates to a special forging die and a forging method for an outer cylinder of a coal mine hydraulic support. Background technique [0002] The cylinder of the hydraulic support for coal mines is an integrated structure, which is prepared in the form of surfacing welding. The materials of the cylinder and the surfacing welding parts prepared by the above method are inconsistent, which is inconvenient for heat treatment. At the same time, it has the characteristics of instability, low density and low strength Defects, easy to damage during use, directly affect the safety of coal mines; especially when processing the outer cylinder, forging is more difficult due to the different structures of the outer cylinder and the middle cylinder, the existing outer cylinders are all used Two-stage processing, welding after processing, ...

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Problems solved by technology

[0002] The cylinder of the hydraulic support for coal mines is an integrated structure, which is prepared in the form of surfacing welding. The materials of the cylinder and the surfacing welding parts prepared by the above method are inconsistent, which is inconvenient for heat treatment. At the same time, it has the characteristics of instability, low density and low strength Defects, easy to damage during use, directly affect the safety of coal mines; especially when processing the outer cylinder, forging is more difficult due to the different structures of the outer cylinder and the middle cylinder, the existing outer cylinders are all used Two-stage processing, welding after processing, due to the large volume and weight of the cylinder of the hydraulic support for coal mines (normally less than half a ton, and about two tons if large), the strength is undoubtedly insufficient through welding Not only the service life is short, but safety accidents are very easy to occur; in addition, the oil pipe in the outer cylinder is generally installed through drilling and welding processes in the later stage, which has poor structural firmness, easy to break, frequent maintenance in the later stage, and Defects affecting the normal use of coal mine hydraulic support cylinders in severe cases

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