46results about How to "No anisotropy" 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 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 relates to a method for preparing a particle-reinforced aluminum-based composite material adopting hot-pressing sintering under an atmospheric atmosphere. The invention belongs to the field of powder metallurgy, in particular to the method for preparing the particle-reinforced aluminum-based composite material adopting hot-pressing sintering under the atmospheric atmosphere. The method aims to overcome the defects of complex process, high cost and low production efficiency of an existing composite material preparation process adopting the hot-pressing sintering. The method comprises the following steps that 1, ball-milling is carried out to mix powder, specifically, the ball-milling is carried out on ceramic particle reinforcement and an aluminum-based body for mixing the powder to obtain the mixed powder; 2, cold pressing is carried out to prepare a prefabricated body, specifically, step-by-step compaction is carried out on the mixed powder by adopting a graphite die soas to obtain the prefabricated body; and 3, the hot-pressing sintering is carried out on the prefabricated body under the atmospheric atmosphere, the graphite die is transferred into the air after thesintering is completed till the die is naturally cooled to the room temperature, and the die is removed to obtain the particle-reinforced aluminum-based composite material. The method is used for preparing the particle-reinforced aluminum-based composite material.

The invention discloses a robot additive manufacturing method based on a MIG/MAG welding process. The robot additive manufacturing method based on the MIG/MAG welding process comprises the following steps that (1) a CAD model of a metal part is established; (2) a welding process test is carried out to establish a mapping relation between welding process parameters and weld seam geometric characteristics; (3) modeling is carried out on a weld seam body and weld seam characteristic parameters; (4) the stacking direction is determined according to the shape of the metal part, the layering heightof overlaying welding is determined according to the established weld seam model, and secondary development is carried out on a three-dimensional model software to realize a slicing function to the model; (5) a section profile obtained in the slicing step is extracted, the row spacing of overlaying welding is determined according to the established weld seam model, an appropriate path planning algorithm is designed, and a numerical control program is generated; and (6) after the numerical control program is imported into a robot simulation software for testing, a robot drive program is exported to produce the metal part. The robot additive manufacturing method based on the MIG/MAG welding process has the advantages of high forming precision and quality, process integration and the like, and has low manufacturing costs and high market response speed.

The invention provides a functional film prepared from functionalized organic powder, a low-temperature damage-free manufacturing method and application. The organic powder film material is composed of the functionalized organic powder and polytetrafluoroethylene (PTFE), polytetrafluoroethylene molecular chains are opened through preheated supersonic airflow, the functionalized organic powder is bonded, air in the powder is extruded to form a continuous cake shape, the powder forms a film through a low-temperature hot-pressing process, and then the film material with low porosity and uniform thickness is formed through a multi-layer film hot-pressing compounding process. According to the method, micron-sized organic films can be continuously prepared in a roll-to-roll mode, the physical and chemical properties of the organic powder can be brought into play to the maximum extent, and performance damage caused by high temperature or introduction of a solvent for film formation or anisotropy caused by recrystallization is prevented. No solvent is introduced in the manufacturing process, and the problems of environmental pollution, high energy consumption, uneven film material densityand the like caused in the solvent drying process are avoided.

The invention relates to a gob-side entry retaining roadside support system and a construction method thereof. A rhombic steel bar net is arranged on one side of a gob, an air drum cloth is laid on the inner side of the rhombic steel bar net, light aggregate concrete is adopted to perform guniting treatment on the air drum cloth and the rhombic steel bar net, a windtight light aggregate concrete spray layer is formed on the side of the gob, the thickness of the light aggregate concrete spray layer is 200-500 mm, and the other side of the light aggregate concrete spray layer is close to a steel tube concrete pier stud supporting device. A steel tube concrete pier stud is formed by filling an empty steel tube with concrete; through a restraint effect of a steel tube casing, internal concrete is in a three-dimensional stressed state, the geometrical stability of the steel tube wall is enhanced, and the bearing capacity of the steel tube concrete pier stud is improved. According to the gob-side entry retaining roadside support system, a top plate can be supported in high strength, coal mining efficiency is effectively improved, and an operation environment in a roadway is improved; the steel tube concrete pier stud can be recycled through a special thrust device, and the roadway retained cost is reduced.

The invention provides a multi-layer and multi-pass composite wire arc additive manufacturing method and system for a metal structure. The multi-layer and multi-pass composite wire arc additive manufacturing method for the metal structure comprises the following steps of: 1, selecting a welding wire and a substrate required for forming a specific metal structural part, and determining technological parameters; 2, generating a multi-layer and multi-pass wire arc additive path of outer wall, short straight line filling and layered turning filling; and 3, enabling a welding gun to move according to the generated multi-layer and multi-pass wire arc additive path under the driving of a robot. The welding gun is driven by the robot to conduct 3D printing according to the generated outer wall, short straight line filling and layered turning filling composite path; the outer wall path improves the size precision of a formed workpiece; the short straight line filling path solves the problem that the heights of complex structural parts are inconsistent in the printing process, and obvious macro buckling deformation is not prone to being formed; and through layered turning filling, interlayer defects are greatly reduced through, and the mechanical property of the workpiece is improved. Digitization, intellectualization and parallelization of part manufacturing are achieved.

To provide a halogen-free flame retardant composition containing no antimony, phosphorus and phosphorus compounds at all, a non-halogen flame-retardant resin composition of environmental type ideal for disaster prevention made of the flame retardant composition, which causes little carbon monoxide (CO) during combustion while having high flame retardance, and molded products, electric wires, cables, fiber or fiber post-processed products made of the resin composition. The flame retardant composition comprises a mixture of (A) a resin having an average particle diameter of not more than 1000 μm selected from wholly aromatic polyamide, polyimide, polyamideimide, a copolymer of the wholly aromatic polyamide, the polyimide or the polyamideimide or a mixture of the above mentioned polymers and (B) a metal hydrate. The flame-retardant resin composition contains 50 to 200 parts by mass of the flame retardant composition to 100 parts by mass of a thermoplastic resin or a thermosetting resin.

The invention provides an automatic trajectory planning method and system for multi-layer and multi-channel wire arc additives of a metal structure. The automatic trajectory planning method comprises the following steps: Step 1, conducting layered slicing treatment on a model of a printed workpiece; Step 2, after obtaining a layered relation matrix, calculating a contour line according to triangles recorded in the matrix by means of a topological relation; Step 3, calculating filling line segments; Step 4, sorting all the intersection points obtained in the Step 3 according to the size of the X coordinate; Step 5, connecting the filling line segments; and Step 6, carrying out layered direction-changing scanning. Multi-layer and multi-channel 3D printing of a metal structural part is carried out according to the composite printing path of outer wall + short straight line filling + layered direction-changing filling, chemical components of a formed workpiece are uniform, the purity is high, and the structure is almost free of anisotropy. Multi-layer and multi-channel 3D printing of the metal structural part is carried out according to the composite printing path of outer wall + short straight line filling + layered direction-changing filling, the grain size of the formed workpiece is small and uniform, the mechanical performance is high, and the level of the formed workpiece can exceed that of a casting with the same component.

The invention discloses a powder metallurgy preparation method of a high-thermal-conductivity Cu-Invar bimetal-based composite material. The powder metallurgy preparation method comprises the following preparation steps of (1) material selection, (2) screening, (3) material mixing, (4) reduction and (5) sintering. Compared with other preparation methods of Cu-Invar composite materials, the powder metallurgy preparation method has the advantages that Invar alloy powder with the large particle size is selected, a discharge plasma sintering process is adopted, the sintering temperature is reduced, the high-temperature retention time is shortened, Invar particles in the prepared Cu-Invar bimetal-based composite material are evenly distributed, the performance is free of anisotropy, interface diffusion is basically and completely inhibited, the comprehensive performance is excellent, and the Cu-Invar bimetal-based composite material can be used as a high-performance electronic packaging heat sink material.