12results about How to "Guarantee internal quality" patented technology

The invention discloses a composite material T-shaped stiffened wallboard co-bonding forming method capable of eliminating edge wrinkles, and the method comprises the following steps: co-bonding of a T-shaped stringer and a stiffened skin wallboard, bag making and vacuumizing, hot pressing and curing, and demolding. Edge wrinkles of the T-shaped stringer on the stiffened skin wallboard are effectively eliminated, vacuum hot-pressing curing forming is adopted, the curing pressure in the T-shaped stringer forming process is more uniform, and the risk of wrinkles of the skin gluing face of the T-shaped stringer and the stiffened skin wallboard is reduced. According to the T-shaped stringer, uniform conduction of tank pressure is facilitated, heat transfer in the curing process is more uniform, and the internal quality of the T-shaped stringer made of the composite material is easy to guarantee, so that the thickness of the T-shaped stringer made of the composite material is not affected while the internal quality of the T-shaped stringer is not affected, the manufacturing cost of the T-shaped stringer made of the composite material is reduced, and the manufacturing process is simplified.

The invention discloses extra-thick rack steel EQ70 for an ocean platform and a production method of the extra-thick rack steel EQ70, the thickness of a steel plate ranges from 210 mm to 254 mm, the steel comprises, by weight, 0.10%-0.12% of C, 0.10%-0.20% of Si, 1.60%-1.70% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.003% of S, 0.030%-0.050% of Als, 2.00%-2.50% of Ni, 0.40%-0.50% of Cr, 0.50%-0.60% of Mo, 0.030%-0.040% of Nb, 0.0015%-0.0020% of B and the balance Fe and inevitable impurities, and the components of the steel meet the conditions that Ceq is smaller than or equal to 0.76%, Pcm A novel alloy component system is combined with clean steel smelting, water-cooling die casting, a heating temperature control process, a high-pressure rolling and after-rolling cooling process, a high-temperature rapid quenching process and an after-tempering rapid cooling process, and finally the steel plate performance is obtained, ReH is larger than or equal to 690 MPa, Rm is 810-890 MPa, the minus 40 DEG C longitudinal and transverse Charpy impact energy unit value is larger than or equal to 120 J at the 1 / 4 thickness position and the 1 / 2 thickness position of the steel plate, and flaw detection meets the GB / T 2970 first level. By adopting the scheme, the alloy is low in cost, high in yield and high in production efficiency, and has good market competitiveness.

In order to solve the technical problems that an existing surface microstructure machining method is difficult to consider high precision, high surface quality, high efficiency, high adaptability, high controllability and low cost, the invention provides a five-axis linkage dot-scribing type forming method for a metal surface microstructure under a complex working condition. By utilizing the characteristics of small size and good replaceability of the microneedle cutter and combining the characteristics of high machining precision and high degree of freedom of the five-axis linkage numerical control machine tool, the pose of the microneedle cutter can be continuously and accurately adjusted through the five-axis linkage numerical control machine tool according to different complex working conditions; a required array microstructure can be machined on the surface of a metal workpiece under the complex working conditions that the operable space is narrow and limited, a free-form surface is formed, and a thin wall is prone to deformation, the defects that according to a traditional die imprinting technology, microstructure distribution controllability is low, and material surface integrity is damaged by micro-milling machining are overcome, and the microstructure forming efficiency is improved; and the method has the advantages of high precision, high surface quality and low cost.

This invention discloses a high-precision centering and positioning steam-water nozzle for dual-section continuous casting, belonging to the field of metallurgical equipment technology. It includes a nozzle body, a connector, and a nozzle head. The nozzle body has a cuboid structure with a groove for connection to the connector, and two slots within the groove. One end of the connector is detachably equipped with the nozzle head, and the other end has a locking nut and a positioning pin. The locking nut is fixedly fitted onto the end of the connector, and the connector is threadedly connected to the groove on the nozzle body via the locking nut. Two positioning pins are symmetrically positioned on the end of the connector with the locking nut, and these pins are adapted to the slots within the nozzle body. The nozzle has a simple structure, is easy to use, reduces maintenance time when changing sections, and accurately, efficiently, and conveniently meets the installation requirements for the vertical dimension and centering accuracy of the nozzle head relative to the billet end face during production of different sections, ensuring the uniformity of secondary cooling of the continuously cast billet during actual production.

The utility model discloses a bearing seat casting device which comprises an upper box sand mold, a lower box sand mold and cavities, the upper box sand mold and the lower box sand mold are distributed in an up-down symmetrical mode, the cavities are arranged in the upper box sand mold and the lower box sand mold, chilling blocks are arranged on the periphery of the cavities, and a dead head and a sprue are arranged at the top of the upper box sand mold. Shells are respectively arranged outside the upper box sand mold and the lower box sand mold, and the shells of the upper box sand mold and the lower box sand mold are fixedly connected together through bolts. The cold iron blocks are arranged on the periphery of the cavity, so that shrinkage cavities and shrinkage porosity at the local hot spot of the casting can be eliminated, cracks of the casting are prevented, the hardness and the abrasion resistance of the casting are improved, the shrinkage cavities and the shrinkage porosity at the local hot spot of the casting are eliminated, the cracks of the casting are prevented, and the internal quality of the casting is guaranteed.

The invention relates to a duplex stainless steel ER2594 welding material and a preparation method thereof, and the welding material is prepared from the following raw materials in percentage by weight: less than or equal to 0.018% of C; 0.50% to 0.60% of Si; 0.60% to 0.80% of Mn; less than or equal to 0.020% of P; s: < = 0.002%; ni: 8.55 to 8.70%; cr: 25.80% to 25.95%; 3.80% to 3.90% of Mo; 0.22% to 0.24% of N; cu: less than or equal to 0.3%; b: 0.0015% to 0.0030% of the total weight of the raw The balance is iron and inevitable impurities; the preparation method comprises the steps that low-P, low-Pb, low-Sn, low-As, low-Sb and low-Bi waste stainless steel is selected, the waste stainless steel is sequentially subjected to smelting, die casting, two-fire cogging and blank solid solution, intermediate billet coping and cogging, intermediate billet rolling and wire rod surface treatment, and the welding material is obtained. The comprehensive performance of the welding material is improved, a wire product without surface defects and core precipitation can be produced in a high-speed wire continuous rolling unit, the yield can reach 85% or above, the surface of an intermediate blank is free of precipitation, it is guaranteed that cracking caused by grinding is avoided in the grinding process, and remarkable economic benefits and environmental protection benefits are achieved.

The present invention provides a method for preparing D2 steel bars and wires by an arc continuous casting and rolling process, and belongs to the technical field of continuous casting and rolling of cold working die steel. The present invention melts, refines and degasses the raw materials for preparing D2 steel to obtain molten steel; the molten steel enters the continuous casting tundish, and a covering agent is added to the molten steel; the molten steel in the continuous casting tundish enters the crystallizer for solidification, and a continuous casting billet is continuously pulled out by continuous casting; the continuous casting billet is sequentially subjected to a first annealing, a continuous rolling and a second annealing to obtain D2 steel bars and wires. The present invention adopts a continuous casting + continuous rolling process to refine the thickness of the eutectic carbide network and improve the uneven distribution of eutectic carbides; at the same time, the macroscopic segregation of the steel billet is reduced, and the uniformity of the organization is improved. The obtained D2 steel bars and wires have an excellent low-magnification organization level, and have good service performance and service life. At the same time, the present invention adopts a continuous casting + continuous rolling process to prepare D2 steel bars and wires with a short production process, which can save production procedures, save energy and reduce consumption, and reduce costs and increase efficiency.

The invention belongs to the field of aeronautical composite material structure components, and relates to a forming method of a composite material topological structure high wall panel. According to the method, the problem of unconventional wall positioning is solved, the relative relation of the positions of the J-shaped high wall after the composite topological structure wallboard is formed is ensured, the problem of follow-up assembly axis deviation is solved, the coplanarity of the upper edge strips of the J-shaped high wall is ensured, the internal quality and appearance control are ensured, the precise process and tool control of composite manufacturing is realized, and the production efficiency is improved. The method is the core of technical breakthrough in the field of domestic composite material processing, and is also suitable for forming other high wall panels with different section structures.

The present application relates to the field of blade shaping, in particular to a low-cost shaping process method for titanium and titanium alloy blades, comprising the following steps: step one, scanning the incoming blade with a three-dimensional scanner to obtain the actual three-dimensional curve of the blade; step two, comparing the actual three-dimensional curve with the three-dimensional model of the blade; step three, marking the lack of value on the blade compared with the model; step four, drawing the deviation 0 line; step five, if the deviation 0 line is at the free end of the blade and is not a closed line, set the welding groove for shaping; step six, welding with welding wire; step seven, using a three-dimensional scanner to perform secondary scanning to obtain the corrected three-dimensional curve of the blade, comparing the corrected three-dimensional curve with the three-dimensional model of the blade, if they coincide, performing step eight, if they do not coincide, returning to step three; step eight, performing ray detection to exclude welding defects; step nine, heat treatment. The present application solves the problems that the blade type value cannot be measured and the shaping cannot be positioned, and corresponding shaping methods are adopted according to different situations.

The present invention discloses a product production inspection system based on big data, which relates to big data product production inspection technology, including a product data inspection module, a product qualification database, a big data platform, an inspection and analysis execution module, an internal and external analysis module and an operation analysis module; the existing product production inspection system based on big data is a comprehensive system that integrates modern information technology, sensor technology, artificial intelligence and other technologies; there are problems such as failure to timely discover and solve potential quality problems, the existence of products that do not require internal inspection, but still carry out the inspection, resulting in low inspection efficiency, and the problem that only one product can be inspected. The inspection and analysis execution module, the internal and external analysis module and the operation analysis module of the present invention perform monitoring and analysis, solve the problem of directly skipping this step for products that do not require internal inspection, improve inspection efficiency, achieve optimal allocation of inspection resources, and improve overall inspection efficiency.

The application discloses a casting method of a cast-state QT700-3 gear hub, and comprises the following steps: step one, determining the placing state of the gear hub in the sand mold as a placing mode with a small opening downward and a large opening upward; step two, determining that one gear hub is placed in the sand mold of each sand box; step three, determining a riser structure, the riser is designed to be integrated with the gear hub, the cross section of the riser extends along the large opening direction of the gear hub, and the cross section is Y-shaped; step four, determining that the parting mode of the gear hub during casting is horizontal parting along the top of the riser of the gear hub, and the sand mold is divided into two parts; and step five, determining a gating system structure, the sprue gate and the runner are located on the upper sand mold, and the position, at which the top of the sprue gate is connected with the outside of the mold, is a funnel-shaped top structure of the sprue gate. The casting method of the cast-state QT700-3 gear hub can reduce casting defects such as inclusions, pores and loose in the gear hub during the casting process, improves the internal quality of the gear hub, and meets the performance requirements of the QT700-3 material in the cast state.

The utility model discloses a cylindrical ball riser and a gating system using the same, the cylindrical ball riser comprises a spherical riser and a cylindrical riser neck, the riser neck and the spherical riser are integrally connected, the center of the spherical riser coincides with the axis of the riser neck, the spherical riser is provided with a first plane, and the first plane is provided with a second plane. A second plane is arranged on the riser neck; the pouring system comprises a casting and the cylindrical ball riser, the casting is connected with a vertical pouring gate, the upper end of the vertical pouring gate is connected with a pouring cup, the vertical pouring gate is connected with a transverse pouring gate, the transverse pouring gate is in butt joint with the second plane, and a hot spot dispersing part of the casting is connected with the first plane. According to the utility model, the process of wrapping heat insulation cotton on the riser is omitted, the casting can be effectively fed, the internal quality of the casting is ensured, and the requirements of customers are met; meanwhile, the labor intensity of workers is reduced, the use consumption of the heat preservation cotton is reduced, the production cost is reduced, and the harm of the heat preservation cotton to a human body is also reduced.