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

The discrete profile mold unit for heat plate formation includes upper mold, which has several closely arranged ram heads comprising screw connected to the template and matched head capable of shifting along the screw; lower mold, which has also several closely arranged ram heads comprising screw connected to the template and matched head capable of shifting along the screw. The ram heads in the upper mold and those in the lower mold are corresponding to each other and may be in the same or different axle. The present invention has the features of simple structure, low cost, convenient operation and maintenance, and adjustable ram head height.

The invention provides a titanium joint seal ring for deep-sea oil drilling and production equipment, which comprises an annular ring body, wherein the center hole of the ring body is provided with a circumferential surface; the outer circle surface of the ring body is sequentially provided with an annular lug boss, a platform, an oblique end surface and a horizontal end surface in the circumferential direction; and the inner circumferential surface can be provided with a thread according to the customer requirements, and thus, can be connected with an oil delivery pipe or used on other devices. The invention also provides a processing method of the titanium joint seal ring, which mainly comprises the following steps: sponge titanium preparation, vacuum smelting of titanium ingot, press forging for root extraction, forging by heating, heat treatment and machining. The actually measured tensile strength is 565 MPa, the yield strength is 460 MPa, the, elongation percentage is 25.2%, the percentage reduction in area is 44%, and thus, the technical properties are obviously enhanced. The titanium joint seal ring can be reliably used in deep sea with the depth of 1000-3000m or more, can bear the huge deep-sea pressure and satisfy the demand of the oil-gas delivery pressure, can enhance the service life and recovery efficiency of the drilling and production equipment, and can prevent the corroded and damaged leaking oil from polluting the sea environment.

The invention discloses a method for rolling and molding a low-oxygen content aero titanium alloy precision sheet. The 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.

Discrete surface die device for sheet metal thermoforming. There are several closely arranged punches on the upper die (1). The punches are composed of a screw (4) connected to the template (3) and a head body (5) matched with the screw. The head body (5) can move along the screw ( 4) Displacement; there are several closely arranged punches on the lower mold (2), the punches are composed of a screw (7) connected to the template (6) and a head body (8) matched with the screw rod, the head body (8) It can be displaced along the screw rod (7); the punches on the upper and lower dies are corresponding, and the corresponding punches on the upper and lower dies can be on the same axis or staggered from each other. It has the characteristics of simple structure, low cost, convenient operation and maintenance, and the punches can be adjusted to meet various heights. The corresponding punches are misplaced, which can not only prevent some punches from being overstressed or dead, but also make the sheet metal The number of stress points on the projection surface is increased, which is conducive to the more uniform forming of the sheet and the uniform distribution of internal stress, reducing the amount of springback after forming.

The invention discloses an impact-resistant ceramic insulator and a manufacturing method thereof. The impact strength of the insulator is not lower than 1.5J / cm 2 , the volume resistivity is not less than 1×10 14 Ω·cm, dielectric strength not less than 750kV / cm, thermal conductivity not less than 20W / m·K, flexural strength not less than 600Mpa, Young's modulus not less than 450Gpa, fracture toughness not less than 55Mpa; The finished insulator has a multi-layer buffer and support structure through multiple sintering methods for each 4mm-5mm, which can withstand multi-angle and high-frequency impact energy, and micro-structuring on the surface of the insulator, which is convenient on the one hand. In order to be used, on the other hand, the impact resistance is also increased; the impact-resistant ceramic insulator of the present invention has good economy, impact resistance, high fracture toughness, and good comprehensive mechanical properties.

The invention discloses a method for manufacturing a titanium-forge flange tee joint. The method comprises the following steps that (1) material preparation is conducted through matching of O-grade titanium sponge and an oxygen bag; (2) firstly, the titanium sponge and the oxygen bag are subjected to piezoelectric electrode treatment, so that an electrode block is obtained, and then an electrode is formed by welding; (3) the obtained electrode is placed in a vacuum electric-arc furnace for secondary smelting treatment, so that a titanium ingot is obtained; (4) heat preservation is conducted on the titanium ingot; (5) the titanium ingot is subjected to upsetting-drawing forging through an oil press, and a titanium square block is obtained after four-time upsetting, four-time drawing are conducted and two-time repeated heating treatment ; (6) the titanium square block is ground and checked, and thus a finished square block is obtained; (7) the finished square block checked to be qualified is machined, and thus a primarily-machined titanium-forge flange tee joint is obtained; and (8) the primarily-machined titanium-forge flange tee joint is subjected to external dimension checking, the diameter of a flange and the wire interval of a hole are checked in sequence, surface polishing treatment is conducted if the primarily-machined titanium-forged flange tee joint is flawless, and thus the titanium-forge flange tee joint is obtained. According to the method for manufacturing the titanium-forge flange tee joint provided by the invention, the problem that the compressive properties of a titanium-cast tee joint and a titanium-welded tee joint are insufficient is solved.

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 toobtain 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 relates to a pipeline welding method, which specifically includes: a preheating step, when the temperature of the environment where the pipeline is located is lower than zero, preheating the joint to be welded of the pipeline and the surrounding pipe materials to a specified temperature; the welding step, Carry out sealed welding on the joint to be welded along the circumference of the pipe material; heat preservation step, heat preservation treatment is carried out on the weld seam formed in the joint to be welded and its surrounding pipe materials, so that the temperature thereof is not higher than a predetermined The speed decreases until the temperature of the weld and its surrounding pipes drops below a predetermined temperature. The invention controls the temperature of the joint to be welded and its surrounding pipes through the early waste heat and post-insulation, and reduces the residual stress of the joint to be welded and its surrounding pipes, so that the tensile strength of the weld is equivalent to that of the pipe, and solves the problem of low temperature welding Cracks are prone to occur in the end, improve the safe service performance of heating pipes, and protect the work and life of urban residents.

The invention discloses a radiation-free multi-component composite tungsten cathode material for a microwave oven magnetron and a preparation process thereof. The mass percentage of the tungsten electrode material is 0.5%~1.5%, the total amount of rare earth oxides accounts for 2%~3% of the mass percentage of the tungsten electrode material, and the alloy element rhenium accounts for 1%~4% of the mass percentage of the tungsten electrode material, The rest is tungsten. The tungsten cathode material has no radiation, excellent thermal emission performance, high temperature creep resistance, thermal shock resistance, sagging resistance, and long service life. The preparation method of non-radiation multi-element composite rare earth tungsten alloy electrode material for microwave oven magnetron includes preparation solution, drying, reduction, acid washing, cold isostatic pressing, sintering, vertical melting, medium frequency induction annealing, pressure processing, winding and mechanical calibration straight. And the performance is better. The multi-component composite tungsten wire produced by this process can obtain large deformation resistance and anti-sagging performance when it is heated for a long period of time at high temperature.

The invention provides a titanium connection sealing ring for deep sea oil drilling equipment, which comprises a circular ring body, the central hole of the ring body is a peripheral surface, and there are circular rings along the circumferential direction of the outer circular surface of the ring body. Shaped bosses, platforms, inclined end faces and flat end faces, the inner peripheral surface can be threaded according to user requirements to connect oil pipelines or use on other equipment. It also provides a processing method for the titanium connecting sealing ring, which mainly includes the steps of sponge titanium material preparation, vacuum melting titanium ingot, forging square, heating forging, heat treatment and machining. The measured tensile strength of the invention is 565MPa, the yield strength is 460MPa, the elongation is 25.2%, the reduction of area is 44%, and the technical performance is significantly improved. It can be used reliably in deep seas from 1000m to 3000m deep or deeper, can withstand huge deep sea pressure and oil and gas transmission pressure, can also improve the service life and production efficiency of drilling equipment, and can also avoid corrosion, damage, oil leakage Pollution of the marine environment.