11results about How to "Eliminate cracks" patented technology

The invention relates to the technical field of martensitic steel, in particular to a 04Cr13Ni5Mo stainless steel plate rolling and temperature control process, which comprises the following steps: heating a pretreated blank to 1190-1210 DEG C at a heating rate of more than 0 DEG C and less than or equal to 5 DEG C / min, and soaking for more than or equal to 2 hours; the rolling reduction rate of the blank is controlled to be 12%-15%, and compared with the reduction rate of the pass before final rolling, the reduction rate is reduced by 20%-25%; stacking slow cooling is larger than or equal to 550 DEG C, and the plate yield is increased by 30% or Through heat treatment processes of normalizing at 1040 DEG C + / -10 DEG C, preserving heat of a plate with the thickness of 85 mm for 4 hours, preserving heat of a plate with the thickness of 115 mm for 5 hours, tempering at 620 DEG C + / -10 DEG C, preserving heat of the plate with the thickness of 85 mm for 6 hours and preserving heat of the plate with the thickness of 115 mm for 8 hours, the yield ratio is stabilized at 0.8-0.85, and the uniformity of mechanical properties is improved by 25%. The stable yield ratio reduces the deformation amplitude of plates and workpieces by more than 40% during later processing, additional repair is not needed, and the production cost is reduced.

This invention discloses an electron beam additive manufacturing method for molybdenum-rhenium alloy based on positive defocus-induced in-situ recovery. Using electron beam additive manufacturing equipment and molybdenum-rhenium alloy powder as raw material, the method proceeds according to the following steps: 1. Establishing a vacuum environment and preheating the substrate; 2. Setting electron beam melting parameters, then scanning and melting the powder layer with the electron beam along a preset path, repeatedly laying powder layers and scanning to obtain a shaped part; after each powder layer is completely melted and before laying the next powder layer, the electron beam focusing state is adjusted to positive defocus, and the electron beam is used to scan the interlayer thermal compensation area of ​​the solidified region. This method, by introducing interlayer in-situ thermal compensation under positive defocus mode, constructs a thermal field distribution that facilitates the in-situ dynamic recovery of molybdenum-rhenium alloy during the electron beam powder bed melting process, achieving optimization of the microstructure and effective release of residual stress, avoiding brittle fracture of the additively manufactured component, and is applicable to fields such as nuclear energy engineering and aerospace.

This invention discloses an infrared camouflage composite yarn, its preparation method, and its application. The preparation process involves first preparing a preform, then dispersing aluminum powder and tin-doped indium oxide powder on a softened film to form an infrared-resistant film. The infrared-resistant film is then coated onto the preform using a layered structure design to prepare a composite preform. Combined with heat treatment, the yarn is then hot-stretched to obtain the improved infrared camouflage composite yarn. The infrared camouflage composite yarn prepared by this invention not only possesses excellent infrared camouflage capability and durability, but the addition of functional particles does not significantly affect the yarn's mechanical properties, such as breaking strength. The functional particles maintain uniform dispersion, improving the uniformity of infrared camouflage performance. This method is suitable for preparing infrared camouflage products, such as military jackets, tents, and backpacks.

This invention discloses a method for preparing a fluorine-free heating and insulating riser, relating to the field of casting technology. The method includes first modifying micron-nano composite aluminum powder with a silane coupling agent, then in-situ reducing and loading zero-valent iron-cerium dioxide catalytic sites, followed by sequentially coating with phenolic resin and a potassium nitrate-manganese dioxide composite oxygen source, and finally forming a silica shell through interfacial hydrolysis and condensation to obtain a core-shell structured composite heating agent. Separately, hollow aluminosilicate microspheres are etched to create pores, then vacuum-impregnated and filled with an organic-inorganic composite aerogel, followed by hydrophobic modification and coating with nano-alumina sol to obtain a composite insulating material. The heating agent is then mixed with the insulating material, mullite powder, corundum powder, expandable graphite, waste glass powder, and a binder, and the mixture is vibrated, compacted, and allowed to cure to obtain the finished product. This invention solves the problems of difficult heating and poor insulation in fluorine-free risers by constructing a multi-level core-shell heating structure and a porous, multi-level insulating structure.

The application discloses a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material, and aims to solve the technical problems that in the existing additive manufacturing, due to the high content of Mg element in the 5-series aluminum alloy, the additive manufacturing is difficult, and the aluminum alloy composite material obtained by additive manufacturing has crack defects and poor densification effect due to thermal cracks and evaporation of strengthening elements. The modification method comprises the following steps: obtaining 5-series aluminum alloy powder; adding titanium carbide particles and element powder to the 5-series aluminum alloy powder for mixing to obtain mixed powder; after heat preservation treatment of the mixed powder, the composite powder with small particle size is collected through screening; and the composite powder is formed by additive manufacturing, so that the modification of the 5-series aluminum alloy is completed, and the aluminum alloy composite material is obtained. The technical scheme of the application is used for providing a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material.

The application discloses a kind of multi-layer board-daily ceramic board strip tray automatic felt production process.The technical scheme of the application includes: large-area wooden multi-layer plywood (such as area 1.22m*1.22m and 2.44m*1.22m, etc.) is placed on automatic glue spreader, and cold pressure glue with thickness of 0.1-0.2mm is uniformly applied on single side; the same size felt piece is automatically laid on the glue-coated surface by using a mechanical tension hand system equipped with 6 independent clamping points; 0.5-1.0MPa segmented rolling is carried out by 8 groups of rotating columns to form a preliminary felt board; 90 preliminary felt boards are cold-pressed for about 6 hours under 5 or so standard atmospheric pressure to completely solidify; and finally, the required size strips are divided by an electric saw cutting platform. The application significantly improves production efficiency by about 20 times, reduces labor cost from 2.5-3 yuan per strip to 0.3 yuan, achieves 95% or more uniformity of glue application, stabilizes product quality, completely eliminates felt separation and cracking problems, significantly improves the protection effect of ceramic body, and provides an efficient and economical technical solution for the automation transformation of the ceramic industry.

The invention discloses a composite anchoring structure and an anchoring method of a wind power mixed tower, the composite anchoring structure comprises a mixed tower body, the lower part of the mixed tower body is a concrete tower tube section, and the composite anchoring structure further comprises a concrete foundation buried under the earth surface and used for bearing the mixed tower body; the external pre-stressed anchoring assembly comprises a pre-stressed cable and an anchor base, the upper end of the pre-stressed cable is connected with the mixed tower body, the lower end of the pre-stressed cable extends to the outer side of the concrete foundation and is anchored to the upper portion of the outer side wall of the concrete foundation through the anchor base, and an anchoring point is higher than the ground surface; the built-in pre-stressed anchor bolt assembly comprises a pre-stressed anchor bolt, an upper anchor plate and a lower anchor plate, the upper anchor plate is pre-embedded in the top of the concrete foundation and fixedly connected with the bottom of the concrete tower drum section, the lower anchor plate is pre-embedded in the lower portion of the interior of the concrete foundation, the pre-stressed anchor bolt penetrates through the concrete foundation, and the two ends of the pre-stressed anchor bolt are fixedly connected with the upper anchor plate and the lower anchor plate correspondingly; prestress is applied to the concrete foundation, and the concrete tower drum section is anchored on the concrete foundation. The problems that a traditional anchoring structure is inconvenient to construct, difficult to overhaul and prone to cracking and water seepage are solved.

The utility model relates to the technical field of cement mortar testing equipment, and discloses a jolt ramming table for a cement mortar test, which comprises a test bed, and a first motor is inserted in the left side of the interior of the test bed; the transmission block is inserted into the right side of the interior of the test bed, springs are connected to the left side and the right side of the transmission block, a cam is coaxially connected to a rotor of the first motor, a driving arm is connected to the outer side of the front portion of the cam through a bearing, a bearing plate is connected to the top end of a connecting block, and a vibration table is installed in the middle of the upper surface of the bearing plate. According to the compaction table for the cement mortar test, a first motor drives a cam to rotate, so that a driving arm can drive a transmission block to move left and right, the vibration table can synchronously move left and right when driving a mold on the surface of the vibration table to vibrate, cement mortar can be helped to better fill all corners of the mold, bubbles and gaps are reduced, and the compaction efficiency is improved. Therefore, the compactness of the sample is improved.

The present application belongs to the field of computer-aided design, and particularly to a computer-aided design system for supporting a white model of an agricultural machine box. The system constructs a three-dimensional geometric model of the white model of the agricultural machine box and extracts the elastic modulus and yield limit parameters; establishes a discrete element model of the sand and a kinematics equation of the vibration table to simulate the sand filling and vibrating process, and obtains the distribution of the dynamic fluid-structure coupling pressure field of the white model surface; takes the dynamic pressure field distribution as the external load boundary condition, takes the maximum deformation of the white model being less than the yield critical value as the constraint, and takes the minimum volume of the support structure as the target to solve the density distribution of the support material; in combination with the support cross-section size requirement of the white model casting process, the density distribution is subjected to threshold extraction and geometric reconstruction to generate a non-uniform support structure that is fitted to the white model surface and adapts to the vibration pressure. The support distribution is matched with the dynamic pressure field, the local deformation and rupture of the white model are eliminated, the support redundancy is avoided, and the structural stability is improved.

The invention relates to the technical field of functional coating materials, and discloses a graphene fluorosilicone resin composite antibacterial anti-skid coating which comprises hydroxyl-terminated polytrifluoropropyl methyl siloxane, few-layer graphene, ionic liquid, chelated titanate, a fluorine-containing silane cross-linking agent, an organic tin catalyst and a solvent. A graphene-ionic liquid-titanate supramolecular precursor is prefabricated, the precursor is driven to migrate to the surface through solvent evaporation, in-situ hydrolysis of titanate is induced through humidity, and a microcosmic anti-skid texture anchored by an inorganic network and a component gradient structure are constructed on the surface. By means of the scheme, firm locking and efficient enrichment of active components on the surface layer are achieved, the problems that traditional coating filler is embedded by resin and prone to falling off and powder falling off are effectively solved, the surface friction coefficient, abrasion resistance stability and antibacterial activity of a coating are improved, and meanwhile the excellent adhesive force of the coating to a base material is guaranteed.

The application relates to the field of ultra-supercritical power generation technology and discloses a sectional key component of an ultra-supercritical generator set and a directional impurity control smelting process of the sectional key component. The process comprises the following steps: preparing high-manganese welding wire; machining a pre-tapping hole in a stress area on a consumable electrode; welding and filling the high-manganese welding wire into the pre-tapping hole to obtain a modified consumable electrode; vacuum self-consumption remelting the modified consumable electrode and applying directional electromagnetic stirring to obtain a directional modified casting ingot; and sectional forging the directional modified casting ingot to obtain the sectional key component. The application realizes local enrichment of manganese elements in key positions by directional filling of high-manganese materials in the pre-tapping hole and in combination with electromagnetic stirring. The sectional component prepared by the process has a welding seam ultrasonic flaw detection level of grade I without defects, the flaw detection qualified rate is increased from below 96.5% of the prior art to 100%, the welding quality and assembly efficiency are significantly improved, and the high-reliability long-service-life requirement of the ultra-supercritical generator set on pressure-bearing and heat-bearing components is met.