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60results about How to "Suppress tremor" patented technology

Two-surface friction stir welding method and device, and tool set for two-surface friction stir welding

The present invention provides a two-surface friction stir welding method and device, and a tool set for two-surface friction stir welding. In order to economically perform two-surface friction stir welding resulting in high joint strength, a first and second rotation tool (3, 4) each has a tool body (3a, 4a) forming a shoulder section (3c, 4c) on the tip portion. The first rotation tool (3) further has a protrusion (3d) formed so as to protrude from the tip portion of the tool body, and the second rotation tool (4) further has a concavity (4d) which is formed in the tip portion of the tool body and which accommodates the tip of the protrusion (3d) during welding of two metal plates (1, 2). The first and second rotation tools are positioned oppositely on the front and back faces of the joining area (J) of the metal plates, and are moved towards each other. The tip of the protrusion of the first rotation tool is inserted into the concavity of the second rotation tool, the shoulder surfaces (3b, 4b) of the shoulder sections of the first and second rotation tool are pressed onto the front and back sides of the joining area, and in that state, the first and second rotation tools are moved along the joining area, friction stirring the entire joining area in the thickness direction of the plates with the first and the second rotation tools.
Owner:PRIMETALS TECHNOLOGIES JAPAN LTD

Metal ultra-thin strip rolling mill with selectable driving modes and rolling method thereof

The invention provides a metal ultra-thin strip four-roller rolling mill with selectable driving modes and a rolling method thereof. The rolling mill comprises a rolling mill mechanical part and a control system, wherein two main driving motors, two main reduction gears and a compound gear box are positioned on the same side of a mill housing; the compound gear box is provided with four output shafts which are connected with an upper support roller and a lower support roller through universal spindles or connected with an upper work roller and a lower work roller through the universal spindles; and the upper driving part and the lower driving part of the compound gear box are independently controlled by the first main driving motor and the second main driving motor respectively and are mutually independent, and the reduction ratio of the upper driving part to the lower driving part is adjustable. The rolling method has a support roller driving mode and a work roller driving mode. When the rolling mill is used for asymmetrical rolling of ultra-thin strips, as asymmetrical rolling can break through the restriction from the minimum rollable thickness of synchronous rolling, the sheet rolling capacity is higher, the on-line adjustment range of the different speed ratio is broad, and the range of rollable raw materials can be effectively expanded.
Owner:NORTHEASTERN UNIV

Wind-resistant optical cable

The invention belongs to the field of cables, and particularly relates to a wind-resistant optical cable. The cable comprises a core wire and an oval outer sheath wrapping the core wire, the oval outer sheath is provided with a wire cavity, the core wire is arranged in the wire cavity, and an anti-torsion protection tube is arranged between the core wire and the wall of the wire cavity; the anti-torsion protection tube is outwardly abutted against the inner wall of the wire cavity, and the inner wall of the anti-torsion protection tube is provided with a plurality of tooth-shaped projections which are abutted against the outer surface of the core wire. Symmetrical reinforcing pieces are arranged on the two sides of the core wire in the long axis direction of the cross section of the outer sheath. The reinforcer is composed of a round part and an arc part, the round part covers the focus of the oval outer sheath on the cross section of the optical cable, the arc part is arched back to the core wire, the middle of the arched end abuts against the outer wall of the round part of the reinforcer, the arc part is in an arc shape on the radial cross section of the optical cable, and the arc circle center coincides with the circle center of the core wire. The wind-resistant optical cable provided by the invention has excellent wind-resistant and torsion-resistant performance, can effectively limit the torsion angle when torsion occurs under the action of strong wind, and reduces the extrusion effect of torsion on the core wire.
Owner:FUTONG GRP JIASHAN COMM TECH CO LTD
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