Metal deforming – By extruding through orifice – By rotating impeller means
Reexamination Certificate
2000-08-31
2003-06-03
Tolan, Ed (Department: 3725)
Metal deforming
By extruding through orifice
By rotating impeller means
C072S253100
Reexamination Certificate
active
06571593
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a continuous shear deformation device, in particular, which is capable of mass-producing shear deformed metallic materials by continuously supplying the metallic materials to a sharply bent channel type mold.
2. Description of the Background Art
When a metal billet is pushed into a sharply bent channel type mold by punch, shear deformation occurs while the metal is passing through the sharply bent zone of the mold, which is generally known as ECAP (Equal Channel Angular Pressing). The inlet and the outlet of an ECAP mold have the same shape and cross-sectional area. Fine grain structure is obtained by ECAP and thus stiffness and plasticity of materials are improved (Metals and Materials, Vol. 4, No. 6, 1998, pp. 1181~1190).
However, in a shear deformation device using a punch in the conventional art, there is a limitation on the size of a supplied billet, so that only a shear-deformed material of a limited length can be obtained. Moreover, once the billet is extruded, the next billet can be extruded only after extracting the punch from the mold. Thus, shear-deformed material has to be intermittently produced by small amounts.
In addition, when the punch is overloaded in the shear deformation device in the conventional art, there is another problem that the overload is directly transferred to the punch and thus the punch and the punch driving apparatus can be damaged or break down.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device which is capable of continuously mass-producing shear deformed materials, with no limitation on the length of material, by continuously supplying the metallic materials to an ECAP mold.
In addition, it is another object of the present invention to provide a continuous shear deformation device which is capable of continuing to operate smoothly though an apparatus for supplying materials into a mold is unintentionally overloaded.
Meanwhile, it is still another object of the present invention to provide a continuous shear deformation device which is capable of reducing friction between a mold and materials, accordingly increasing the life span of the mold, decreasing the force required for press-fitting materials, and thereby reducing the whole operating costs
In addition, it is yet still another object of the present invention to provide a continuous shear deformation device which can be compatibly used according to materials, in particular, materials of different thickness from thin sheet to thick plate material.
In order to achieve the above objects, there is provided a continuous shear deformation device in accordance with the present invention, including: a sharply bent shear deformation mold; and a rotary guide apparatus installed at the inlet of the mold for guiding materials into the mold by frictional contact with the material.
In accordance with a preferred embodiment of the present invention, rotary type rolls such as a single rotary roll, a pair of rotary rolls and plurality of rotary rolls, etc. are used as the above inlet guide apparatus. Instead of rotary type rolls, belts of various shapes, including a loop in which a plurality of polyhedral blocks are sequentially connected or a belt having an inner side of chain form, etc. can be used. In addition, guide apparatuses of the preferred embodiment can be used in combination with each other. For example, rotary type rolls are used at one side and a belt transmission are used at the other side. Even in case of employing a belt transmission, belts of various forms can be used in combination. In addition, a plurality of guide apparatuses can be used according to design objective such as required friction force. The description in this paragraph will be directly applied to an outlet guide to be mentioned later.
In addition, in the present invention, an outlet rotary guide for exiting materials after shear deformation can be provided additionally.
In accordance with another preferred embodiment of the present invention, a transmission belt can be used as a guide for exiting materials, immediately after shear deformation, to the outside of the mold inlet by frictional contact between the belt and the shear-deformed materials. In addition, in accordance with another embodiment, the guide can be a rotary roll or a transmission belt installed at the outside of the outlet which feeds discharged materials and winds or flattens materials.
In addition, in accordance with another preferred embodiment of the present invention, the mold can be provided with an inclined or a curved inlet in order to increase the amount of contact between the guide apparatus and materials.
In addition, the thickness of materials prior to passing through the guide apparatus of the present invention may be greater than that of materials after passing through the guide apparatus. In this case, the material is rolled according to the clearance space of its supply path, and thereby it is possible to provide a shear deformation device which can be compatibly used according to materials, for example, materials of different thickness from thin sheet materials less than 0.5 mm to thick plate materials, with no limitation on thickness. In a case where there is a wide difference between the thickness of materials and the thickness of a molding path, the material can be provided to a mold by gradually reducing the thickness of the material using several pairs of rolls and/or other guide apparatuses.
In addition, in accordance with another embodiment of the present invention, a frictional contact can be provided with a groove corresponding to the cross-sectional shape of materials in order to increase the frictional contact force between the guide apparatus or guide feeder and the materials. And, it can be covered with any particular material of high friction coefficient, its surface roughness can be increased, or materials of high friction coefficient can be directly used as a body of a guide apparatus.
Additional advantages, objects and features of the invention will become more apparent from the description which follows.
REFERENCES:
patent: 3871201 (1975-03-01), Hayashi et al.
patent: 4546634 (1985-10-01), Fuchs, Jr.
patent: 6370930 (2002-04-01), Lee et al.
patent: 1467089 (1977-03-01), None
patent: 55-33824 (1980-03-01), None
patent: 59-113920 (1984-06-01), None
patent: 1-104410 (1989-04-01), None
patent: 2-235515 (1990-09-01), None
patent: 3-275213 (1991-12-01), None
Equal Channel Angular Pressing: A Novel Tool for Microstructural control, by Minoru Nemoto, et al., Metals and Materials, vol. 4, No. 6, 1998, pp. 1181-1190.
Chung Young-Hoon
Moon In-Ge
Park Jong-Woo
Shin Myung-Chul
Korea Institute of Science & Technology
Scully Scott Murphy & Presser
Tolan Ed
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