19results about How to "Improve internal quality" patented technology

This invention discloses a low-pressure casting and heat treatment process for high-strength and high-toughness aluminum alloy used in contact wire ratchet, belonging to the field of rail transit component manufacturing technology. The process uses AlSi7Mg0.3 alloy, obtaining high-purity aluminum liquid through two refining and modification treatments. In the low-pressure casting stage, a three-stage pressure control is adopted: the first stage is the liquid-raising stage, the second stage is the mold-filling stage, the third stage is the pressure-increasing and shrinkage-compensating stage, and finally, pressure holding and cooling are performed; followed by T6 heat treatment. This invention solves the casting problems of easy air entrapment in ratchet teeth and easy shrinkage porosity in the hub. The casting has a tensile strength ≥275MPa and a breaking load ≥94.5kN, meeting the requirements for a 2×10 contact wire ratchet. 5 Secondary fatigue load requirements.

The present application relates to the technical field of composite material forming, in particular to a kind of off-site gas flow guide method of composite material vacuum bag forming.It includes the following steps: after impregnating off-site flow guide agent using non-woven grid cloth, drying, preparing off-site gas flow guide net;Off-site gas flow guide net is laid in the interlayer interval of prepreg, and is cured with prepreg in the curing process.The purpose of the off-site gas flow guide method of composite material vacuum bag forming is to solve the problem of internal quality defects such as porosity that easily occurs in the vacuum forming and curing process when forming large thickness composite material using large tow high weight prepreg, reduce material process cost by reducing the number of laid layers, effectively improve the production efficiency of existing large thickness composite material products.

The present application belongs to the technical field of metal material casting and rolling, and discloses a vertical casting and rolling pouring system, which comprises a front box, a closed channel assembly arranged below the front box, a casting nozzle arranged at the bottom end of the closed channel assembly, a second runner arranged at one side of the front box, a downspout arranged at the end of the second runner away from the front box, a first runner arranged at the top end of the downspout, a first flow control device arranged at the pouring position of the first runner, and a second flow control device arranged at the pouring position of the front box. The serpentine channel composed of the first, second and third stop blocks arranged in the inner cavity of the casting nozzle can realize stable metal liquid supply. The pouring system has simple structure, convenient installation and debugging, and is suitable for mass production. In the vertical direction, the slag and bubbles in the metal liquid can float upwards and prevent entering the product, thereby improving the internal quality of the product.

The application provides a cover structure of a composite material heat curing device, which comprises a side wall, an upper cover arranged at the top of the side wall, a first rubber plate arranged at the bottom of the side wall, and a closed cavity formed by the upper cover, the side wall and the first rubber plate. A plurality of shunt pipes are arranged in the cavity and connected with air outlets of a hot air machine. The shunt pipes are provided with a plurality of air outlets in communication with the cavity. An air outlet pipe is in communication with the cavity at one end and with the outside at the other end. The cover structure cooperates with a box body of the heat curing device to play the roles of heating and pressing the preform as a negative mold. Compared with the forming mode of rigid negative mold and positive mold cooperation or the mode of vacuum bag film pressing, the cover structure uses a flexible rubber plate as the negative mold, the rubber plate is better in the effect of sticking to the mold after being heated and expanded to press the preform, the preform is more uniform in stress during the curing process, and the internal quality of the product is better. The rubber plate is more versatile in pressing, and the same rubber plate is applicable to the forming of products of different sizes without the need of manufacturing negative molds of different sizes.

The invention provides a forming process of a complex special-shaped section launching barrel. The forming process comprises the following steps of production preparation, forming of a functional layer and an inner pipe body, filling of a guide sliding groove and forming of an outer pipe body, overall curing and pre-pipe-hoop forming and aftertreatment. According to the invention, a sharp and complex geometrical shape is converted into a curved surface in smooth transition through the pretreatment procedure of filling wires into the guide chute, so that a perfect base is provided for the subsequent laying of a structural layer, and the hidden danger of overhead is fundamentally eliminated; a vacuum bag technology is combined with hand lay-up forming, and a silicone rubber block is used in a key area for local sealing and flow guiding. According to the combined process, uniform compaction pressure can be applied within the range of the whole structure, interlayer bubbles and redundant resin are efficiently removed, a product with high compactness and low porosity is obtained, and the reliability of consistency of mechanical properties of the product is greatly improved.

The application discloses a continuous casting method of heavy section beam blank with high axis crystal rate, which comprises the following steps: controlling the superheat of the molten steel ΔT; controlling the pouring speed of the molten steel Vc; carrying out electromagnetic stirring on the web and the flange of the secondary cooling zone; controlling the secondary cooling intensity, the cooling water amount of each section and the distribution of the cooling water amount of each surface; and reasonably distributing the cooling area of each section to produce the heavy section beam blank with the axis crystal rate of 40-55%. The method is suitable for the heavy section beam blank with the weight of more than 1.5 tons per meter.

The invention discloses a tail end electromagnetic stirring dynamic control method, system and equipment for continuous casting CrMo steel, and belongs to the technical field of ferrous metallurgy continuous casting. The method comprises the steps that firstly, working condition parameters such as the superheat degree of tundish molten steel and the casting speed of a casting machine in the continuous casting process are collected in real time; then inputting the working condition parameters into a preset F-EMS dynamic parameter matching model, and matching to obtain optimal F-EMS working parameters under the current working condition, including a working mode, current intensity and frequency; and finally, F-EMS equipment is controlled to operate according to the matching parameters, and feedback optimization is conducted on the model according to the quality result of the produced casting blank. According to the method, the working condition-parameter dynamic matching relation is established and applied, the problem that fixed F-EMS parameters cannot adapt to production fluctuation is solved, real-time accurate matching of the stirring effect and the casting blank solidification state is achieved, the high-quality CrMo steel continuous casting blank free of white bright bands and controlled in center segregation can be stably produced, and the production efficiency is improved. And the homogeneity and the stability of the internal quality of the product are obviously improved.

The application discloses a method for electron beam fuse additive manufacturing of beta titanium alloy components, and belongs to the technical field of additive manufacturing. The application aims to solve the problems of long preparation period, low efficiency, low utilization rate, serious oxidation, significant beta spot and poor strength and toughness of the prior art. The method comprises the following steps: pretreating the printing wire and the substrate; establishing a three-dimensional entity model based on the target beta titanium alloy component, performing slice processing on the three-dimensional entity model to generate multi-layer two-dimensional slice data, and then importing the slice data into an electron beam fuse additive manufacturing equipment, and setting a scanning path, preheating parameters and printing process parameters; starting the equipment and performing vacuumization, printing the beta titanium alloy according to the set printing parameters and procedures, completing all layers, and obtaining the beta titanium alloy component. The beta titanium alloy component prepared by the application has high density, and provides a reliable technical approach for the preparation of high-performance beta titanium alloy components in the fields of aviation and aerospace.

This invention discloses a low-cost rare earth weathering steel and its production process. The chemical composition and mass percentage of the weathering steel are as follows: C 0.06%~0.12%, Si 0.25%~0.50%, Mn 0.60%~1.00%, P 0.07%~0.12%, S≤0.005%, Cu 0.15%~0.40%, Cr 0.30%~0.50%, Ce 0.002%~0.015%, Alt 0.020%~0.050%, Ti 0.02%~0.08%, N≤0.006%, with the balance being Fe and unavoidable impurities. This weathering steel uses rare earth oxides added to refining slag, and a high-alkalinity, low-oxidizing refining process to improve rare earth yield. Rare earth inclusions and nozzle turbulence are modified through calcium-magnesium composite treatment, achieving rare earth micro-alloying to replace high-alloy additions. While meeting the mechanical properties and high corrosion resistance of 355MPa grade weathering steel, it significantly reduces alloy costs by more than 15% compared to traditional weathering steel. The process flow is compatible with existing production lines and is suitable for industrial mass production.

This invention relates to the field of composite material preparation technology, and in particular to a method for preparing high-viscosity, medium-temperature curing epoxy resin castings. Using high-viscosity, medium-temperature curing epoxy resin as raw material, this invention employs a press pre-compression molding-autoclave curing process to prepare epoxy resin castings with excellent mechanical properties and density. Furthermore, this preparation method is simple, highly operable, safe, and widely applicable, effectively improving the internal quality and stability of high-viscosity epoxy resin castings, and is of great significance for promoting the overall performance improvement of epoxy-based composite materials.

The utility model relates to die casting mould technical field, especially a kind of vehicle aluminium shell die casting mould, including main mould, forming die, first driving device and second driving device, main mould includes upper die holder and lower die holder, and upper die holder and lower die holder are closed to form forming cavity, forming die is set in forming cavity, and forming die is by first fixed die holder, second fixed die holder, third fixed die holder, first movable die holder and second movable die holder, first fixed die holder is closed with second fixed die holder and third fixed die holder, and forms die casting cavity between each other, and the first direction of die casting cavity is provided with first movable slot, and the second direction is provided with second movable slot, and second movable die holder is set in second movable slot, and first movable die holder is set in first movable slot.The utility model effectively reduces the blowhole, shrinkage and other defects in the interior of aluminium shell, improves the internal quality and mechanical properties of aluminium shell.

The application discloses a method for preparing oriented silicon steel and the oriented silicon steel, and the method comprises the following steps: continuously casting molten steel through a crystallizer to obtain a casting blank, wherein a unidirectional pulse current is applied to the molten steel in the crystallizer; hot-rolling the casting blank to obtain a hot-rolled coil; and carrying out subsequent treatment on the hot-rolled coil to obtain the oriented silicon steel. The unidirectional pulse current applied to the molten steel in the crystallizer can change the type and content of the metallographic structure in the casting blank, so that less or no banded structure is generated when the casting blank is subjected to a subsequent rolling process, thereby improving the magnetic properties and internal quality, such as linear crystal defects, of the prepared oriented silicon steel.

The application provides a high-silica / phenolic resin composite material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method of the high-silica / phenolic resin composite material comprises the following steps: performing desolventizing treatment on high-silica fiber / phenolic resin premix to obtain high-silica fiber / phenolic resin dry mix; performing pre-pressing treatment on the high-silica fiber / phenolic resin dry mix to obtain high-silica fiber / phenolic resin pre-pressing material; and laying a silicone rubber plate on the high-silica fiber / phenolic resin pre-pressing material, and then performing mold closing treatment, pre-curing treatment and curing treatment to obtain the high-silica / phenolic resin composite material. The preparation method provided by the application can realize the preparation of large-size composite materials without using a large-tonnage press during the mold pressing process, solves the problem that a large-tonnage press needs to be used for pressing during the preparation process of the existing large-size composite materials, and the prepared composite material has good internal quality stability, a small defect area and good popularization and application value.

The present application relates to the technical field of part processing, and discloses a forging forming method and tool for large thin-wall drum-shaped parts, comprising the following steps: step 1, designing a forging drawing according to the size of the part; step 2, designing a tire mold tool according to the forging drawing; the tire mold tool comprises a hollow forming tire mold, an upper pad mold and a punching tool; step 3, determining the process parameters of staged heating and the forging process parameters of each step; step 4, performing forging forming processing according to the steps, and obtaining a forging part. The present application can achieve high product processing quality, help to improve processing efficiency and reduce processing cost.

This invention provides a feeding method for vacuum consumable remelting and a smelting method for vacuum consumable ingots. The feeding method includes: S1, feeding begins when the remaining weight of the consumable electrode is 10%–13% of the initial total weight, and the current is reduced to 90%–95% of the remelting stage current; S2, when the remaining weight of the consumable electrode is 7%–10% of the initial total weight, the current is reduced to 55%–60% of the remelting stage current, and the droplet time is reduced to 70%–80% of the remelting stage droplet time; S3, when the remaining weight of the consumable electrode is 2%–3% of the initial total weight, the current is reduced to 40%–50% of the remelting stage current, and the voltage is reduced to 80%–90% of the remelting stage voltage. The smelting method includes feeding using the above feeding method. This invention solves the shrinkage cavity defect problem after normal head and tail trimming of steel ingots produced in large vacuum consumable furnaces, improving the internal quality of the ingots.

The application provides a high-casting-performance beryllium aluminum alloy and a preparation method thereof, and belongs to the technical field of alloy materials.The preparation method comprises the following steps: preparing materials according to the weight percentages of Be ingots, Al ingots, Ag ingots, Co sheets, Si and La metals; placing the Ag ingots, the Co sheets, the Si and the La metals at the bottom of a crucible, then sequentially placing the Al ingots and the beryllium ingots into the crucible, refining, and obtaining a melt; uniformly stirring the melt, then gradually cooling the melt to a pouring temperature, then pouring the melt into a prefabricated ceramic mold shell, and standing for 3-5 minutes in a furnace and cooling outside the furnace.The beryllium aluminum alloy has a uniform and dense structure, good fluidity, high casting performance, and is easy to be cast into a shape, and has fewer casting defects.

This invention provides a continuous casting method for steel that enables high-speed continuous casting even of extremely thick slabs using a vertical unsolidified continuous casting machine, while ensuring the internal quality of the resulting slabs and preventing surface cracking. The continuous casting method of this invention is a method for continuously casting steel slabs using a vertical unsolidified bending continuous casting machine, wherein an alternating current moving magnetic field moving along the width of the mold is applied to the molten steel in the mold using an electromagnetic stirring device within the mold, inducing swirling currents in the molten steel, and continuous casting is performed while stirring the molten steel. The travel speed of the alternating current moving magnetic field, calculated by equation (1) below, is 0.20–1.50 m / s. Here, in equation (1), U is the travel speed of the alternating current moving magnetic field (m / s), τ is the pole spacing of the coil of the electromagnetic stirring device within the mold (m), and f is the frequency (Hz) of the current applied to the coil of the electromagnetic stirring device within the mold. U=2τf………(1).

The utility model relates to the technical field of axle box cover and disclose a kind of casting mould for rail vehicle axle box cover, including pouring assembly, water cooling assembly is installed in pouring assembly top, the air-cooled component is set in the water cooling assembly bottom, by the design of left and right mould, so that metal liquid can be vertically flowed into to mould inner cavity from top to bottom, so that metal liquid can evenly fill entire mould cavity, help the natural rising of gas and slag, reduce the pore formation in the casting, improve the quality of casting, by nozzle to left and right mould continuous flushing, can effectively take away heat, reduce mould temperature, reach the effect of rapid cooling, it can also flush the residue on the surface of mould, it is conducive to improving the service life of mould, by the air-cooled component set, water cooling assembly can be cooperated to speed up cooling speed, improve work efficiency, it can also avoid a large amount of dust adhesion, affect pouring effect.

The invention discloses a control method for solving ER70S-6 casting furnace shrinkage cavity, the method comprises the processes of converter primary smelting, LF furnace refining, continuous casting and casting blank inspection, in the continuous casting process, the residual steel amount of a large ladle is controlled to be larger than or equal to 2 t, protective casting is adopted in the whole process, the baking temperature of a tundish is larger than or equal to 1000 DEG C, a crystallizer is used for electromagnetic stirring, and molten steel component and temperature homogenization is promoted; the casting furnace superheat degree is controlled to be 30-45 DEG C, the casting section is 130 * 130mm-180 * 180mm, the casting pulling speed is 2.0 + / -0.1 m / min, the casting specific water flow is controlled to be 1.6 L / kg-2. 4L / kg, and shrinkage cavities are inhibited. According to the method, key process parameters of a continuous casting procedure are optimized, and the problem that shrinkage cavities are prone to being generated in casting blanks of an ER70S-6 steel casting furnace is solved.