A large length-to-diameter ratio hollow thin-walled shaft extrusion preparation device and method

Abstract

The invention relates to an extrusion preparation device for a hollow thin-wall shaft with a large length-diameter ratio and a method of the extrusion preparation device, and belongs to the technicalfield of material processing and manufacturing. The extrusion preparation device relates to manufacturing of the hollow thin-wall shaft with the large length-diameter ratio, not only can hollow through hole shaft blanks be prepared, but also hollow deep blind hole shafts can be prepared, and the demands of the hollow thin-wall shaft with the large length-diameter ratio at home and abroad are greatly met. The hollow thin-wall shaft is a hollow thin-wall shaft blank with the length-diameter ratio being no less than 10 and the wall thickness being no more than 20 mm. The extrusion preparation device includes an extrusion rod, an upper backing plate, an upper die seat, a left half concave die, a right half concave die, a guiding column, extrusion die cores, an extrusion cylinder, a left hydraulic cylinder, a right hydraulic cylinder and an extrusion inner cylinder, and the extrusion preparation device is not only suitable for hollow thin-wall shaft extrusion forming, but also for extrusionforming of the hollow thin-wall shaft with the large length-diameter ratio of an aluminum alloy material with low strength and small hardness. According to the extrusion preparation device for the hollow thin-wall shaft with the large length-diameter ratio, a gap can be controlled by adjusting the outlet diameters and sizes of the extrusion rod and the extrusion die cores, and hollow thin-wall extrusion parts with different requirements of the large length-diameter ratio can be obtained.

Description

technical field [0001] The invention relates to an extrusion preparation device and method for a hollow thin-walled shaft with a large length-to-diameter ratio, which belongs to the technical field of material processing and manufacturing. It relates to the manufacture of a hollow thin-walled shaft with a large length-to-diameter ratio. It can also be used to prepare hollow deep blind hole shafts, which will greatly meet the domestic and foreign needs for hollow thin-walled shafts with large aspect ratios. Background technique [0002] With the development of industrial technology and the demand for weapons and equipment, the technical requirements for parts are increasing. Especially in high-temperature and high-strength environments, the requirements for hollow thin-walled shaft blanks are more stringent. In such environments, hollow shaft parts are made of high-temperature alloys or ultra-high-strength steels. Such materials are characterized by their high-temperature str...

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Problems solved by technology

The patent publication No. CN105057529A "Variable Section Hollow Shaft Forging Extrusion Method" and the patent publication No. CN106862471A "A Forming Method for Hollow Extruded C250 Alloy Steel Long Shaft Forgings" both introduce the preparation method of the hollow shaft blank , and obtained a hollow long shaft with good structure uniformity and stable forging performance, and greatly reduced the utilization rate of forging raw materials, but for the forming of thin-walled tubes with large aspect ratios, this method is the first It is necessary to manufacture the lower die with extremely high height, and secondly, in the process of using the lower ejector pin to eject the hollow shaft blank, the deformation of the shaft blank is easy to occur; the patent publication number is CN105921671A "A Back Extrusion of Stepped Hollow Shaft Parts" Forming Method and Die" introduces a method of reverse extrusion to prepare hollow long shaft with variable cross-section, but the height of the long shaft formed by this manufacturing method is limited. When the height reaches a certain length, the extruded rod will be difficult to produce. Die, even broken because of insufficient strength

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