54results about How to "Improve flow behavior" patented technology

Improved shape and strength of the weld in a welded structure are obtained by use of a weldable aluminum product comprising a structural component which is a sheet, a plate or an extruded body and is made of an aluminum alloy containing not more than 1.5 wt % Zn. This component has, adhered on at least one side, a cladding layer made of an AA7xxx-series alloy having a corrosion potential lower than that of the alloy of the structural component. The alloy of the structural component is preferably an AA5xxx-series alloy containing Mg in the range 2 to 6 wt %.

The invention relates to a method for the production of a fiber reinforced sandwich component (10) having a honeycomb core (12), the honeycombs of which are closed on both sides. The honeycomb core is closed at least on one side by a cover layer (14) made of fiber material, which is embedded in matrix material. The method comprises the following steps: —Producing a fabric comprising the honeycomb core and at least on one side of the honeycomb core, disposed from the inside to the outside, a curable adhesive layer (20), a barrier layer (16) and a fiber layer (14); —Locking the fabric on a one-sided molding tool (30) in a gastight chamber, which is formed up by a vacuum foil (48) on the one-sided molding tool; —Creating a vacuum in this gastight chamber, —After creating the vacuum, hardening or partial hardening of the adhesive layer between the honeycomb core and barrier layer in this vacuum such that the honeycomb cells (18) are evacuated at least partially before they are closed off by the barrier layer; —After hardening or partially hardening of the adhesive layer, infusion of the fiber layer in a vacuum with a matrix material; and —Hardening of the matrix material in a vacuum.

The invention discloses a blowing and refining device and method used for removing the tundish molten steel inclusion. The blowing and refining device is characterized by comprising a tundish 1, a blowing device 2 and a dipping cover 3, wherein the tundish comprises a permanent layer and a working layer arranged on the inner surface of the permanent layer; the bottom of the permanent layer is provided with the blowing device; the blowing device comprises an air brick and a ventilating pipe; the air brick comprises a dense layer and a ventilating layer; the middle of the ventilating layer is provided with an air chamber; and the dipping cover is a refractory material cover supported by a steel plate, is connected with an automatic lifting system and is arranged above the blowing device. According to the blowing and refining device, an air curtain retaining wall with a big air flow can be introduced in to form continuous and tight bubble columns, the average residence time of molten steel in the tundish is obviously prolonged, the molten steel flowing behavior is obviously improved, the molten steel can be stirred by a great quantity of tiny bubbles, inclusions with a smaller size can be adsorbed, and meanwhile, steel slag rolling and mixing and the secondary oxidation of the molten steel due to big blowing amount can be avoided.

The invention discloses a friction stir welding process for combining back surface heating with frontal surface chilling. The friction stir welding process comprises the following steps: a workpiece to be welded is fixedly clamped; heaters are arranged on two sides of a welding line area; a chilling shielding gas protective cover for moving along with a stirring head is arranged on the outer side of the stirring head; the heaters are started to heat the back surface of the workpiece to be welded, so that the temperature of the upper surface of the workpiece to be welded is not higher than 250 DEG C; the chilling shielding gas protective cover is filled with the chilling shielding gas, and the covering range includes the welding line area and the upper surface area of the workpiece to be welded rightly above the heaters; friction stir welding equipment is started, and the rotating stirring head is controlled to insert in the workpiece to be welded; the shaft shoulder end surface of the stirring head is continuously pressed down by a section of distance, and the stirring head is stopped until a set inserting depth is reached; the stirring head is controlled to continuously rotate by a period of time under the set inserting depth, so that the welding line area of the workpiece to be welded is fully preheated to reach an excellent plastic state; and the stirring head is controlled to finish the welding work of the welding line area at a set welding speed.

Two-for-one twisting spindle having a pneumatically actuated threading device, with a spindle shaft rotatable about a vertical axis partially configured as a hollow shaft with a lower feed bore extending coaxially to the rotational axis, and with an injector element opening into a thread guide channel of a thread guide ring temporarily connectable during threading to a compressed air source. Part of the compressed air feed to the injector element is formed by the feed bore. The compressed air feed comprises a connection element (27) with a curved air channel (26), which connects the feed bore (24) to the injector element (16). The connection element (27) is configured as a separate component and the air channel (26) is adapted to the flow requirements.

The invention relates to emulsifier concentrates which are pourable at 20° C. and contain (a) up to 90 percent by weight of a polyethylene glycol fatty acid diester based on a C16-C22 fatty acid, C16-C22 hydroxy fatty acid, polyhydroxy stearic acid, or poly-(C16-C22 hydroxy fatty acid), (b) up to 80 percent by weight of an oil or oil mixture that is liquid at 25° C., and (c) 2 to 8 percent by weight of water. Also disclosed are the use in emulsions and a method for producing emulsions based on the inventive emulsifier concentrates.

An exhaust gas system for an internal combustion engine, in particular a motor vehicle engine, is provided having, in one form, two cylinder banks arranged at an acute angle to one anther and each having at least one exhaust gas outlet, a so-called V-engine, having exhaust gas guide elements arranged in the region of the inner angle, including a housing surrounding the exhaust gas outlets of both cylinder banks in a gas tight manner and having at least one exhaust gas outlet opening is characterized in that the housing is made in two parts, with a first part which is connected to the one cylinder bank and surrounds its exhaust gas outlets and with a second part which is connected to the other cylinder bank and surrounds its exhaust gas outlets; in that the two parts each have a side facing the other part and having at least one housing opening via which the two parts communicate with one another; and in that an expansion compensation element is arranged between the two parts and surrounds the housing opening of the two parts in a gas tight manner.

A method of laser brazing a metal workpiece assembly along a joint seam established between a first metal workpiece and a second metal workpiece involves advancing a laser beam along the joint seam while feeding a filler wire into the laser beam to melt a leading end of the filler wire, which is impinged by the laser beam, to produce and dispense molten filler material within and along the joint seam. The dispensed molten filler material solidifies behind the laser beam into a braze joint. Additionally, as part of the method, a position of a focal point of the laser beam relative to the leading end of the filler wire is repeatedly fluctuated during advancement of the laser beam along at least part of the joint seam.

A switchgear, especially for actuating valves, includes a housing (18) and a coil body (10) disposed in the housing. A switch element is guided in the coil body. The coil body is provided with a winding (14) of a conductor (16) that is connected to a plug connector (22) via contact elements (20). At least some sections of the housing (18) and of the plug connector (22) are enclosed by a plastic compound (24). Sealing devices (40) seal off the interior (42) of the switchgear from the surroundings (44). At least one of the sealing devices (40) is configured as a sealing web (48) of a meltable material. The sealing web (48) is disposed on the bottom face (50) of a plug plate (26) of the plug connector (22) which faces the housing (18). The sealing web (48), in the molten connection state, seals off at least the engaging parts of the plug connector (22) that are connected to the housing (18) from the surroundings (44) in a fluid-tight manner by the plastic compound (24), thereby eliminating the need for conventional rubber packing rings (O rings) in the area of the plug connector that are prone to failures.

The invention refers to a valve, in particular a pressure valve, comprising a feed area provided in front of a globe valve in flow direction of the medium, wherein the globe valve can be sealed by a loose closing element provided in the feed area, and wherein an activation rod angles the closing element against the flow direction of the medium with reference to the globe valve. The invention is characterized in that in the feed area a flow guiding device is provided, wherein the flow guiding device has several channel areas, so that the medium flowing through the channel areas is set in a helical twist.

The invention relates to a mixing apparatus for the metered addition of an additive to a pumpable mixture, in particular a pumpable hydraulically setting mixture, in particular a liquid shotcrete composition, wherein the mixing apparatus includes a delivery line for delivering the mixture through the mixing apparatus, and a metering device communicating with the deliver line for introducing the additive into the mixture is provided, wherein the mixing apparatus is including in that the metering device has a device for dispersing the additive in a carrier method such that the additive can be introduced into the mixture in a state in which the additive is finely distributed in the carrier medium.

The invention relates to the field of micro-turbine disc precise manufacturing, in particular to a micro-turbine disc forming device and method. The device is characterized in that an upper mold plate (1) and a lower mold plate (2) are arranged; guide sleeves (3) are arranged on the upper mold plate (1); guide columns (4) matched with the guide sleeves (3) are arranged on the lower mold plate (2); a closed frame is formed by the upper mold plate (1) and the lower mold plate (2) through the guide sleeves (3) and the guide columns (4); and a mold auxiliary mechanism is arranged in the closed frame and comprises an upper puncher pin fixing plate (7), an upper puncher pin (8), a concave mold fixing plate (9), a floating concave mold (10), a spring (11), a lower puncher pin (12), an induction coil (14), a concave mold containing cavity (16), an ejection bolt (18) and a ceramic sleeve (20). Compared with the prior art, the device has the beneficial effects of being simple in structure, short in technological process, high in efficiency, low in cost and the like.

A trailing edge for a rotor blade tip of an aerodynamic rotor of a wind turbine. The trailing edge comprises a trailing edge delimiting line, which replicates the contour of the trailing edge, and multiple serrations to improve flow behavior at the trailing edge. The serrations are provided at the trailing edge in dependence on the trailing edge delimiting line, and consequently on geometrical and operating parameters.

In order to make a drive device available on the basis of a gel-type propellant, in particular, for a flying object, comprising at least one tank for gel-type propellant, a combustion chamber and a device for supplying propellant to the combustion chamber, which is of a simple construction it is suggested that at least one radiation impinging device be provided for acting on gel-type propellant with electromagnetic radiation and/or at least one heating device for heating gel-type propellant in order to improve the flow behavior