41results about How to "Offset tensile stress" patented technology

The invention discloses a steel-concrete with ultrahigh performance joint section and a manufacturing method thereof. The steel-concrete with the ultrahigh performance joint section comprises a jointbeam, one end of the joint beam is connected with a steel beam, the other end of the joint beam is connected with a concrete beam, and the connection part between the joint beam and the steel beam isprovided with a bearing plate; according to the manufacturing method, the sectional dimensions of the steel beam and concrete beam, the length of the joint beam and the sectional dimension of the bearing plate are selected according to the design requirements; the steel-concrete with ultrahigh performance joint section and the manufacturing method thereof have the advantages that the problems of the complex structure, uneven stiffness transition, high construction difficulty and the like of the steel-concrete joint section can be solved, the structure is simple, and the steel-concrete joint section is safe and reliable.

The present invention provides an engine crankshaft made of ductile iron for replacing a same type forged steel crankshaft. Compared with the same type forged steel crankshaft, the diameter of the front end shaft journal of the free end of the engine crankshaft made of ductile iron of the present invention is increased by 7-12%, the diameter of the inner end shaft journal is increased by 408%; the radius of the transition round angle at the connection place between the free end and the main shaft journal; the crank arms of the crankshaft made of ductile iron are symmetrically double lug shape extending to the outside from the left and the right, the maximum width of the double lug shape place is increased by 20-40% more than the maximum of corresponding part of same type forged steel crankshaft. The surface of the crankshaft made of ductile iron of the invention is processed with nitriding treatment by glow plasma; the increased transition round angle place, the main shaft journal and the connection rod journal are processed with rolling treatment. The life of the crankshaft made of ductile iron of the invention is equal to or higher than the life of the same type forged steel crankshaft.

The invention discloses a welding process for a prepressing stress bimetal centrifugal casting composite pipe end flange. The welding process comprises the following steps that a groove is formed in the welding face of the flange, and the flange is preheated evenly before welding and is heated to a certain temperature; then the flange is installed at the end of a bimetal centrifugal casting composite pipe, and the flange is fixed to the bimetal centrifugal casting composite pipe in a spot welding mode; and then the flange and the bimetal composite pipe are connected through circular welding. The flange welded by the welding process can form certain pressure stress on the composite pipe, thus the problem of interlaminar separation of the composite pipe due to welding residual stress after welding of the bimetal composite pipe end flange can be avoided effectively, and the reliability of a connector of the double-layer bimetal centrifugal casting composite pipe end flange is improved greatly.

The invention discloses an automatic deposition device and method applied to the outer surface of an environment-friendly container nozzle. The automatic deposition device comprises a welding box, a mechanical arm, a welding rod box and a rotating device; and through a controller, the mechanical arm can achieve rotating, pitching and telescopic operation to automatically clamp a welding rod, and is matched with a rotating shaft to conduct omnidirectional deposition on the outer surface of the nozzle. The welding box is ventilated through a three-way valve, thus the whole welding box is in theprotective atmosphere of inert gas, waste of the inert gas in the traditional welding deposition process can be reduced, and the phenomena of deposition metal oxidation and air holes caused by instability of inert airflow in the welding process can also be avoided; and through the automatic device, the outer surface of an environment-friendly container is evenly and fully covered with a nickel-based alloy 690, and a residual pressure stress layer is formed on the outer surface of the nozzle to improve the hardness and corrosion resistance of the outer surface of the environment-friendly container nozzle.

The invention discloses a high-strength domestic ceramic prestressed coating material. The high-strength domestic ceramic prestressed coating material consists of a base material and an adhesive solution under the condition that the ratio of the base material to the adhesive solution equals to 1 g: 4-8 mL; the base material comprises the following raw material components: 10-20 wt% of Al2O3, 45-70wt% of SiO2, 12-28 wt% of MgO and 2-10 wt% of ZnO; and the adhesive solution is a solution of one or more of CMC, PVA, PVB or water glass, and the concentration of the adhesive solution is 5-10 wt%.The invention further discloses a preparation method and a ceramic product of the high-strength domestic ceramic prestressed coating material. A surface coating mode is adopted, by adjusting and optimizing the ratio of the coating raw materials, pressure stress is introduced on the surface of a ceramic blank by coated layer coating treatment, and therefore, the integral strength of ceramics is improved remarkably. Raw materials are toxic-free and pollution-free, the process is simple and practicable, and industrialized application and popularization are facilitated.

The invention provides an appearance structural member applied to an intelligent terminal product and a manufacturing method of the appearance structural member. The appearance structural member comprises at least three metal structure layers, wherein the metal structure layers comprise an outermost metal structure layer and metal structure inner-layers from outside to inside by using a mosaic module principle, and the metal structure inner-layers at least comprise a second metal structure layer and a third metal structure layer; in every two adjacent metal structure layers, the length and the width of the relatively outer layer are greater than those of the relatively inner layer, and every two adjacent layers are connected together by pressure casting or molten metal casting and fusion; each metal structure layer is formed by gradation; except the outermost metal structure layer, the melting point of the firstly formed metal structure inner-layer is not more than that of the later formed metal structure inner-layer. The appearance structural member adopting the technical scheme is attractive in appearance, shrinkage distortion is reduced, the product percent of pass is improved, and meanwhile the failure risks of product distortion, junction cracking and the like caused by subsequent stress release are lowered.

The invention discloses a control method for actively overcoming the dead weight and the line shape of vice cable saddle buttress concrete, which comprises the following steps: embedding bearing falsework embedded parts when anchorage construction is performed; assembling a falsework, and positioning and firmly welding a bearing falsework post bracket with the embedded parts; performing formwork casting on vice cable saddle buttress and rear anchor block segment concrete; actively lifting the cast segment buttress concrete through the bearing falsework and hydraulic equipment; continuing casting anchor block and vice cable saddle buttress concrete layer by layer, and actively lifting the cast vice cable saddle buttress concrete through designing a calculation lane until the vice cable saddle buttress concrete casting is finished; perfecting the bearing falsework, and casting anchor room and side wall concrete; and then, casting closure block and anchor room top plate concrete, and removing the bearing falsework. By adopting the control method for actively overcoming the dead weight and the line shape of the vice cable saddle buttress concrete, the stress and the line shape of the pier body structure can be effectively controlled; and certain prestress is generated on pier bottom stress, thereby, pull stress generated by part of structure is canceled; the construction quality and the construction safety are improved; the construction cost can also be saved; and the economic benefit is increased.

The invention discloses a light-emitting diode and a preparation method thereof, and relates to the technical field of light-emitting diodes. The light-emitting diode comprises: a substrate; a first semiconductor layer, a light-emitting layer, a second semiconductor layer and a contact layer sequentially arranged on the substrate; The barrier layer arranged between the first semiconductor layer and the light-emitting layer is used to reduce the overflow of electrons from the first semiconductor layer to the second semiconductor layer. The barrier layer sequentially includes a P-type doped InGaN layer, an undoped InGaN layer layer and an N-type doped InGaN layer, and a P-type doped InGaN layer is arranged on the first semiconductor layer. The invention can solve the technical problem in the prior art that the electron-hole wave function overlap rate in the quantum well is low, which affects the luminous efficiency of the light-emitting diode.