30results about How to "Uniform distribution of internal stress" patented technology

The invention discloses a method for rolling and molding a low-oxygen content aero titanium alloy precision sheet. Tthe low-oxygen content aero titanium alloy precision sheet is obtained by rolling twice by using a twenty high rolling mill. The method comprises the following steps of: rolling by using the twenty high rolling mill, degreasing, recrystallization annealing, cold rolling with the twenty high rolling mill again, degreasing, stress relief annealing, stretcher leveling, longitudinal cutting/transverse cutting, inspecting, packaging, and the like, wherein aero titanium alloy plates, such as TC4, TA15 and the like, with the thickness of 1-5 mm, are used as raw materials. The thickness tolerance of the titanium alloy precision sheet is +/-0.005 mm, the camber is 0.3-1 mm/1m, the surface quality is No.2B, the surface smoothness is up to 1-2 I-Unit, the grain size is up to 5-6 grades, the surface has no surface contamination layer (such as an oxygen-enriched layer, an alpha layer and the like), the internal stress is distributed uniformly, no anisotropy exists, and the subsequent plastic forming feature is favorable. The invention has the advantages of easy production method, low cost, high product quality and high production efficiency.

The method includes following steps: adding certain quantity of solution of thorium nitrate into tungsten oxide so as to prepare doped powder of tungsten oxide; deoxidizing the obtained doped powder of tungsten oxide to obtain powder of thorium - tungsten; acid cleaning powder of thorium - tungsten to remove impurity, and producing sintered body of powder of thorium - tungsten; using press work to obtain thorium -tungsten filament with needed diameter, and content of thorium dioxide being 0.7-1.1 wt%, and enwinding thorium -tungsten filament by using wire coil; Finally, straightening filament. The invention raises the rate of finished products, and optimizes working performance of tungsten winding.

The invention discloses a method for rolling and forming a low-oxygen-content pure-titanium precise thin strip coiled material. The rolling and forming method is used for rolling the low-oxygen-content pure-titanium precise thin strip coiled material by using a multi-pass twenty high rolling mill and particularly comprises the following steps of: preparing raw materials; performing primary rolling; degreasing; performing recrystallizational annealing; performing secondary cold rolling; performing secondary degreasing; and forming. In the low-oxygen-content pure-titanium precise thin strip coiled material finished product obtained by the method, no surface pollution layers, such as an oxygen enriched layer and the like, are formed on the surface; internal stress is distributed uniformly; no anisotropism exists; the subsequent plastic forming property is high; thickness tolerance is +/- 2percent; camber is 0.3 to 1 millimeter per meter; the surface quality is TR; the surface flatness reaches 1-2I-Unit; and grain size reaches 5 to 6 levels. Compared with the prior art, the method has the advantages that: the low-oxygen-content pure-titanium precise thin strip coiled material obtained by the method has excellent comprehensive performance; and the production method is simple and practicable, low in cost and high in efficiency.

The invention belongs to the field of technologies for manufacturing magnetic materials, and provides a technology and a device for forming dry bag quick isostatic pressing in oriented magnetic fields. The technology and the device have the advantages that an oriented magnetic field technology is ingeniously and organically combined with the technology and the device for forming dry bag isostatic pressing by the aid of a novel design concept, so that dry bag isostatic pressing can be formed in the oriented magnetic fields which have optional directions and optional magnetic field intensities by the aid of the novel technology and the novel device; orientation degrees of products can be obviously upgraded; two necessary working procedures in existing neodymium, iron and boron magnet production can be combined with each other to form one working procedure by the novel technology and the novel device, and the automation and mechanization levels are high; powder is not in contact with pressing blanks and oil in production procedures, and accordingly a latex sheath for binding the corresponding pressing blank can be omitted; the pressing blanks are quite uniform in density distribution and internal stress distribution; the pressing blanks can be machined, and original powder can be recycled; single-hole and multi-hole thin-walled pipes, sleeves and multi-magnetic-pole products which are heavy and are in complicated shapes or have large length-diameter (L/d) ratios can be produced by the aid of the technology and the device, the rare earth mineral resource utilization rate can be greatly increased, and the neodymium, iron and boron magnet industrial production level of China can be upgraded to the world leading level.

The invention discloses a mold system with a high/low-temperature fast conversion function. An upper mold plate and a lower mold plate of a mold are each internally provided with a snake-shaped pipe. The upper mold snake-shaped pipe and a high-temperature circulating system form an independent loop. The lower mold snake-shaped pipe and a cooling circulating system form an independent loop. A circulating fluid medium is adopted for the high-temperature circulating system for heating, a circulating fluid medium is adopted for the cooling circulating system for cooling, and the loop of the high-temperature circulating system and the loop of the low-temperature circulating system are each provided with a switching valve. According to the mold system with the high/low-temperature fast conversion function, the mold can be heated or cooled rapidly through high-temperature fluid or low-temperature fluid, high/low temperature rapid conversion of the mold is achieved, it is guaranteed that a material (or a component) is shaped under a uniform temperature field, internal stress distribution is uniform, and it is guaranteed that the performance of products is stable and deformation is prevented; and besides, rapid and safe demolding can be achieved.

The invention belongs to the technical field of high-temperature magnetic resonance probe cooling, and discloses a cooling device for a high-temperature magnetic resonance probe and application thereof. The cooling device comprises an upper cooling unit and a lower cooling unit, wherein the upper cooling unit comprises an outer barrel structure and an inner barrel structure; the inner barrel structure is sleeved with the outer barrel structure, and the two are in tight fit with each other; an inner surface of the outer barrel structure or an outer surface of the inner barrel structure is provided with a plurality of S-shaped channels which are uniformly distributed; the inner barrel structure is provided with a plurality of groups of water inlets and water outlets; the water inlets and thewater outlets are connected with two ends of the S-shaped channels; the lower cooling unit is arranged at the bottom of the upper cooling unit, and comprise an upper cover and a lower cover which arein tight fit with each other; a plurality of cooling channels are formed in the upper cover or the lower cover; and the lower cover is provided with a water inlet and a water outlet which are connected with the cooling channels. During application, the cooling device wraps the outside of the high-temperature magnetic resonance probe. Through adoption of the cooling device, omni-directional cooling can be realized for the high-temperature magnetic resonance probe, and the detection accuracy and the service life are ensured.

The invention provides a waterproof antibacterial directional shaving board. The waterproof antibacterial directional shaving board comprises an upper surface layer, a core layer and a lower surface layer, the mass ratio of the upper surface layer and the lower surface layer to the core layer is (60% to 75%):(25% to 40%), and the paving included angles between the upper surface layer and the corelayer as well as between the lower surface layer and the core layer are each 80-90 degrees. The invention further provides a preparation method of the waterproof antibacterial directional shaving board. The preparation method comprises the steps of shaving, drying, mixed spraying, drying, gluing, paving, liquid spraying and hot pressing, plate billet balancing, edge cutting, cooling, sanding and film forming. The waterproof antibacterial directional shaving board has the beneficial effects that a reaction between -NCO groups of isocyanate MDI glue in a board material of the waterproof antibacterial directional shaving board and -OH groups of shavings is complete, the gluing effect is good, and internal stress is uniformly distributed; the board material is good in overall stability, in thelong-term using or storage process, the phenomena of crack, layering, bulking and the like are avoided, and release of substances such as formaldehyde harmful to the human body is avoided; and bacterial resisting, mold preventing and insect preventing can be effectively achieved, and the antibacterial rate of the waterproof antibacterial directional shaving board reaches 99.1-99.7%.

The invention discloses an aluminum pressure casting with good pressure resistance. The bottom end of an aluminum pressure casting body is fixedly connected with a threaded steel pipe, the surface ofthe threaded steel pipe is sleeved with a convex nut, the convex nut is of a convex structure, the horizontal section of the convex nut is of an eccentric circle structure, and the convex nut and thethreaded steel pipe are of a threaded connection structure; the inner wall of the aluminum pressure casting body is fixedly connected with fixed blocks, and each fixed block is of a fan-shaped structure, so that the internal stress of the casting can be evenly distributed; and the bottom end of the aluminum pressure casting body is fixedly connected with a rubber ring, and the cross section of therubber ring is of a rectangular structure. The aluminum pressure casting is provided with the convex nut and a concave nut, the left side of the bottom end of the convex nut can apply transverse acting force to the right side to prevent loosening, the interior of the aluminum pressure casting body is composed of the six fixed blocks, and a fixed plate is connected between every two fixed blocks,so that internal stress distribution of the casting is more uniform, and the pressure resistance of the casting is higher.

The invention discloses a method for eliminating annealing wrinkles of an aluminum alloy strip, and belongs to the technical field of aluminum alloy production. Before complete annealing, the rolling reduction of the first pass of cold rolling of the aluminum alloy strip is controlled to be 25%-35%; the rolling reduction of the middle pass of the cold rolling of the aluminum alloy strip is controlled to be 25%-40%, and the rolling reduction is gradually reduced by 3%-5% one by one; the final pass rolling reduction of the cold rolling of the aluminum alloy strip is controlled to be 15%-20%; heating is started after the complete annealing, the temperature of furnace gas rises to 400-500 DEG C, and the heating time is longer than or equal to 8 hours; and the furnace gas is heated to a target temperature for the complete annealing, heat preservation is conducted, cooling is conducted to 200 DEG C or below along with a furnace after the heat preservation, and discharging is conducted from the furnace. The invention provides a production method for eliminating the annealing wrinkles of the aluminum alloy strip. The method can solve the problem that after an aluminum alloy cold-rolled strip is annealed, wrinkles appear in the middle of an inner ring of a coiled material in the width direction.