223results about How to "Small amount of rebound" patented technology

The invention discloses a flexible stretch-forming device and a method for carrying out stretch-forming on a plate by utilizing the flexible stretch-forming device and solves the technical problem that the stretch-forming accuracy of a flexible stretch-forming device for the molded surface of a reconfigurable unidirectional continuous die is low. The technical scheme includes that the flexible stretch-forming device comprises an industrial manipulator, a heating forming head, a power supply, a multipoint die, a nail post and a polyurethane elastic cushion. The nail post is mounted on the base of the multipoint die, the polyurethane elastic cushion is positioned above the nail post, the lower surface of the polyurethane elastic cushion is attached to the discrete surface formed by the nail head of the nail post, the plate is positioned above the polyurethane elastic cushion, the lower surface of the plate is attached to the upper surface of the polyurethane elastic cushion, the heating forming head is positioned above the plate, and the spherical head surface of the heating forming head is contacted with the upper surface of the plate. According to the flexible stretch-forming device and the method for carrying out stretch-forming on the plate by utilizing the flexible stretch-forming device, the electromagnetic induction heating forming head is adopted to locally heat the plate in the stretch-forming process, the local heat effect of the region can reduce the deformation resistance of the plate, the plasticity is improved, the resilience value is reduced, and the forming accuracy of the plate is improved.

The invention provides a sheet material hydro-mechanical deep drawing forming device and a sheet material hydro-mechanical deep drawing forming method using a magnetic medium to pressurize, belongs to the technical field of hydro-mechanical deep drawing, and solves the technical problems in a traditional sheet material hydraulic forming process that wrinkles are formed, the deformation uniformity is poor and the like, caused by the reason that overflowing pressure of a flange region is reduced, when a sealing ring is not used in order to realize overflowing and lubrication. A sealed hydraulic chamber formed by a concave die and a lower plunger piston is used for containing the magnetic medium; a convex die can penetrate through an edge pressing ring to drive a plate blank to move downwards to enter the sealed hydraulic chamber formed by the concave die and the lower plunger piston; a first coil is arranged on the periphery of the outer side of the flange region formed by the concave die and the edge pressing ring; a second coil is arranged on a pull rod of the lower plunger piston; and a magnetic control unit is used for controlling the sizes of magnetic fields generated by the first coil and the second coil. Firstly, a certain amount of the magnetic medium is poured into the hydraulic chamber and the edge pressing ring is moved downwards after the plate blank is placed; the viscosity and the pressure value of the magnetic mediums on a flange and in the hydraulic chamber are respectively adjusted and controlled through the magnetic fields; and a punching head is moved downwards until a plate piece is formed. The sheet material hydro-mechanical deep drawing device and the sheet material hydro-mechanical deep drawing method using the magnetic medium to pressurize are suitable for hydro-mechanical deep drawing formation of a sheet material.

The invention discloses an alkali-free liquid accelerator, which is free of alkali in raw materials and preparation. The accelerator is composed of 30-80% of aluminum sulfate, 1-10% of hydroxy carboxylic acid, 4-15% of organic amine, 3-10% of polyhydric alcohols, 1-5% of inorganic acid and the balance of water. The accelerator disclosed by the invention is high in early strength, low in long-term strength loss, good in caking property and low in resilience value; as a result, environment-friendly no-pollution construction can be realized; the synthetic process of the accelerate is simple and moderate in reaction conditions; and therefore, the accelerate is an excellent-performance alkali-free liquid accelerator.

The invention discloses an age hardenable aluminum alloy integral panel one-step forming method based on an autoclave. The method includes the steps: firstly, fixing an aluminum alloy plate blank on a forming die, and placing the aluminum alloy plate blank into the autoclave after the aluminum alloy plate blank and the forming die are sealed in a vacuum manner; secondly, providing temperature needed by aluminum alloy aging and pressure needed by component laminating inside the autoclave, and enabling heavy-curvature portion materials to reach yield limit and enter a creep aging stage by keeping a laminating state after plastic deformation. Internal stress distribution is adjusted by local plastic deformation, so that the problem of non-uniform performance caused by internal stress difference in the creep aging process can be eliminated, production cycle and rebound are decreased by combining plastic deformation with creep deformation, and the height of the die can be decreased. The process method can be implemented in the autoclave with enough capacity, the highest working pressure is not lower than 10Bar, and the using temperature can range from 100 DEG C to 200 DEG C. The method is simple and convenient to operate, can be implemented only by one set of female die and has an actual industrial production application value, a tool is simple, and cost is saved.

The invention discloses a fireproof material for a mending furnace as well as a preparation method and a using method thereof. The fireproof material for the mending furnace comprises magnesia, magnesium powder, aluminium oxide, calcium oxide and sodium hexametaphosphate, wherein the total weight of the fireproof material for the mending furnace is used as a reference, the total content of the magnesia and the magnesium powder accounts for 80-90 percent by weight; the content of the aluminium oxide accounts for 3-7 percent by weight; the content of the calcium oxide accounts for 3-7 percent by weight; the content of the sodium hexametaphosphate accounts for 3-7 percent; and the main components of the magnesia and the magnesium powder are MgO. The fireproof material for the mending furnace is high in adhesive ratio, good in stickiness, solidification and hardness, and low in resilience value during mending; and therefore, a mending layer formed by the fireproof material for the mending furnace is good in anti-erosion performance and long in service life.

The invention provides a manufacturing method of an elastic concave-convex warp knitted fabric. The method comprises the steps of weaving preparation, guide bar configuration, knitting and the like. When a convex area of a concave-convex pattern is woven, GB4 is subjected to yarn laying and looping on a rear needle bed of a double-needle-bed warp knitting machine, and because low-elasticity yarn or non-elastic yarn serves as the GB4 for embroidering, the resilience amount of the woven yarn is relatively small or the woven yarn is not resilient. When a concave area of the concave-convex pattern is woven, GB3 is subjected to yarn laying and looping on the rear needle bed of the double-needle-bed warp knitting machine, the woven yarn is relatively large in resilience amount because spandex core-spun yarn serves as the GB3, and the yarn contracts to a bottom layer, so that a surface layer is sunken downward to the bottom layer, and the formed concave-convex structure has certain elasticity. Compared with a traditional technical scheme, the concave-convex warp knitted fabric can be directly woven without subsequent treatment, the process is simple, and the production cost is relatively low.

The invention discloses a shotcrete admixture, comprising: 13 to 15 parts by weight of cold water quick dissolving powdery methylcellulose ether or cold water quick dissolving powdery hydroxyethyl cellulose ether, 13 to 15 parts by weight of cold water quick dissolving powdery polyvinyl alcohol, 8 to 11 parts by weight of naphthalene-series powdery water-reducing agent, 1 to 2 parts by weight of mesh polypropylene fiber and 58 to 62 parts by weight of cement accelerator. The shotcrete admixture is prepared by adding the constituents into the concrete together for increasing the cohesion of concrete and viscosity of early-stage slurry, the slurry initial setting time is short, and the resilience amount of concrete can be reduced by 30 to 50 percent.

The invention relates to a steel strip for the wheel spoke of the vehicle and the manufacturing method thereof. The chemical composition of the steel strip has the following weight percentage: C is larger than 0 and lower than or equal to 0.26 percent, Si is lower than or equal to 0.50 percent, Mn is larger than 0 and lower than or equal to 2.0 percent, P is lower than or equal to 0.035 percent, S is lower than or equal to 0.035 percent, Al is larger than 0 and lower than or equal to 0.10 percent, Nb is larger than 0 and lower than or equal to 0.060 percent, and the residue is Fe and micro impurities. The steel strip of the invention adopts molten iron desulphurization, converter smelting, LF ladle refining, slab continuous casting, rolling by hot continuous rolling mill, which has superior welding performance and molding performance, the mechanical property is uniform, the processing of the spinning spoke of vehicle wheels in varied specifications can be performed, and the finished product rate is high. The steel strip for the wheel spoke of the vehicle of the invention has the advantages that the cost is low, the producing operation is easy, and the industrialization is easy.

The invention discloses an increment forming device and a method for performing increment forming by utilizing the increment forming device and solves the technical problem of poorer forming precision of the existing panel movable ring electromagnetic incremental forming device. The technical scheme is that an industrial manipulator and a C-shaped frame are respectively fixed two ends of a base; a clamping frame is positioned at the opening of the C-shaped frame; a heating forming head is mounted at the clamping end of the industrial manipulator; a control system for the heating forming head is connected with a high-energy pulse power supply. During heating forming, a panel is placed on the clamping frame to be clamped, then the C-shaped frame is mounted on the industrial manipulator and the heating forming head is well mounted, the panel is subjected to an extruding force by a compression spring, and meanwhile, the heating forming head is enabled to be consistent and harmonious in moving due to the C-shaped frame. As the heating forming head adopts electromagnetic induction for heating, the deforming resistance of a material is reduced by the local heat effect of the contacting deforming area between the heating forming head and the panel, the plasticity is improved and the forming precision is improved.

The invention discloses a construction method conversion construction method of a super-large-span tunnel in a V-level to IV-level surrounding rock section. The elevation of an excavation arching lineis controlled to be consistent; in transition section construction, a left pilot tunnel temporary middle wall and a right pilot tunnel temporary middle wall on the two sides of a pilot and a rear pilot in a surrounding rock double-side-wall pilot tunnel method simultaneously move towards the middle of the tunnel until the left pilot tunnel temporary middle wall is in contact with the right pilottunnel temporary middle wall, and foot locking anchor rods are applied to the two sides of a temporary inverted arch; and then the right pilot tunnel temporary middle wall is removed, and the left pilot tunnel temporary middle wall is reserved as a middle temporary middle wall of a CRD method. According to the method, a double-side-wall pilot tunnel method is transversely transited to the CRD method through a gradual change method, the time interval between construction method conversion is avoided, and disturbance of later removal of temporary supports of the double-side-wall pilot tunnel method to surrounding rock is reduced; and therefore the construction speed is increased, the construction period is shortened, enforced idleness due to poor organization of work is avoided, and economicbenefits of tunnel construction are improved.

The invention discloses a deep high-ground-temperature roadway heat-insulation lining structure and a construction method thereof. The lining structure comprises a grouting heat-insulation ring, a primary lining heat-insulation layer and a secondary lining heat-insulation layer. Firstly, a heat-insulation grout material is injected through a hollow grouting anchor rod to form a grouting heat-insulation ring; the primary lining heat-insulation layer is distributed to form a primary support, wherein the primary lining heat-insulation layer comprises a first jet ceramsite concrete layer, a reinforcing mesh layer, a metal support and a second jet ceramsite concrete layer; after roadway deformation is stabilized, the secondary lining heat-insulation layer is constructed, and construction of the structure is completed, wherein the secondary lining heat-insulation layer comprises a third jet ceramsite concrete layer and a heat-insulation plate. By means of the structure and existing common support means and according to the current situation that deep mining high-temperature damage is severe, the stability of a roadway support structure is ensured by reasonably improving supporting materials and increasing the heat-insulation plates; by means of multiple heat-insulation measures, heat is effectively prevented from spreading into a roadway, and the application and popularization value is good.

The invention belongs to the technical field of new concrete materials, and particularly relates to a special water reducer for a railway tunnel construction sprayed concrete. An adverse effect of a retarder on an accelerator is eliminated; without influencing a setting performance of the concrete, longer-time stability of a working performance of the concrete is maintained; through adding a viscosity modifier and adjusting the air content, the sprayed concrete has better cohesiveness and can be easily adhered onto a tunnel rock wall, so that the number of rebound and drop of the sprayed concrete is reduced, and the aims of reducing the waste of the sprayed concrete and improving the durability of the concrete are achieved; meanwhile, through appropriately adding an organic early strengthcomponent, the early strength of the sprayed concrete is improved.

A cold-hot sequential coupling forming technology of large-scale aluminium alloy complex structural members is a novel forming technology which is derived from the intersection and fusion of liquid-filled forming technology and hot-stamping forming technology. The novel forming technology has the characteristics of liquid filling forming and hot stamping forming at the same time. The cold-hot sequential coupling forming technology comprises the steps that the upper and lower dies are closed, according to adjusting the blank holder force, a panel veneer is impacted between the dies; the panel veneer is attached to die profiles in function of high pressure liquid in a liquid chamber, the forming of most features is completed; and after forming the liquid-filled, according to the characteristic of the thermoplasticity of materials, the hot-stamping technology process is carried out by using heated movable insert blocks, the forming of local features is completed, sequential forming of different part features is completed, and final product parts are obtained. The dies are installed in one time, and two forming processes are realized, and thus the time-consuming of switching the dies is reduced, and the accuracy requirements of global forming and external dimensions of the product parts are guaranteed. At the same time, the movable insert blocks are convenient to install and easy to replace, so the time of repairing dies is reduced and the production efficiency is improved. The sequential forming technology has the unique advantages of in the forming of aerospace, automotive and other fields of complex structural alloy members, and has wide application prospect.

The invention discloses a liquid accelerator and a preparation method thereof. The liquid accelerator is composed of the following components by weight percentage: 15-30% of aluminium hydroxide, 5-10% of sodium metaaluminate, 5-10% of sodium carbonate, 8-10% of magnesium sulfate, 5-20% of hydroxy carboxylic acid, 0.1-0.4% of defoamer, 1-10% of stabilizer and the balance of water. The liquid accelerator has rapid sprayed concrete setting time and obvious effect for the early strength and the 30-day compressive strength, is good in caking property, low in resilience value, simple in synthetic process, mild in reaction condition and excellent in performance and can realize the green environment-protection non-pollution construction. The effect is better than that of the market liquid accelerator.

The invention relates to the technical field of tunnel construction, and particularly discloses a tunnel sprayed concrete. The tunnel sprayed concrete comprises the components based on the volume of tunnel sprayed concrete of 360-500 kg/m3 of cement, 818-890kg/m3 of coarse sand, 789-817kg/m3 of broken stone, 1.5-4.5kg/m3 of basalt fiber, 90-98kg/m3 of fly ash, 8-20kg/m3 of accelerator and 5-10kg/m3 of water reducing agent. The invention also discloses a preparation method of the tunnel sprayed concrete. By adding the fly ash, the strength, the bending strength and the permeability resistance of the concrete are improved; meanwhile, the compactness of the concrete is effectively improved, the effect of preventing weak base water damage can be achieved, and the durability of the concrete isimproved; through the addition of basalt fiber doping, the bending strength is gradually improved, the condition that concrete is cracked under a high stress section can be effectively prevented, theconcrete construction performance is good, the spraying speed is high, and the rebound amount is small; and compared with common sprayed concrete, the concrete doped with basalt fibers can save 1/3 ofspraying time.

The invention discloses a corrosion-resistant high-strength support/hanger assembly. The support/hanger assembly comprises a tube clamp and a connecting part arranged at the lower end part of the tube clamp, wherein the tube clamp comprises two clamp pliers which are in the same shape and are symmetrically arranged; each clamp plier comprises a connecting end, a circular arc section and a clamping section; the connecting ends of the two clamping pliers are connected together in a rotating manner; the arc mouth ends of the circular arc sections of the two clap pliers are oppositely arranged; fastening holes are respectively formed in the clamping sections of the two clamp pliers, and the two fastening holes correspond to each other. The invention further discloses a manufacturing technology of the corrosion-resistant high-strength support/hanger assembly. The support/hanger assembly disclosed by the invention is simple and reasonable in tube clamp structure, scientific in design, high in strength, hardness and toughness, resistant to acid and alkaline corrosion, not liable to deform under high temperature and high pressure, and long in service life.

The invention discloses a method for forming an irregular ring piece by utilizing a stainless-steel rectangular ring rolled piece through thermal bulging, comprising the following steps of: sleeving the heated stainless-steel rectangular ring rolled piece on the periphery of a pre-heated bulging blockin a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed by the bulging block in a radial direction along the inner circumference surface of the ring rolled piece and becomes the irregular ring blank after being deformed for 11-13%, thus completing primary bulging; rotating the irregular ring blank for 45 degrees along an center axis, thus completing primary rotation; carrying out secondary bulging with the deformation amount of 1.8-2% and secondary rotation on the irregular ring blank according to the previous steps; carrying out tertiary bulging with the deformation amount of 1.4-1.6% and tertiary rotation on the irregular ring blank according to the previous steps; and carrying out quartus bulging with the deformation amount of 1.2-1.4% and quartus rotation on the irregular ring blank according to the previous steps, so as to obtain the irregular ring piece. The size precision of the irregular ring piece can reach 0.1-0.2% of the corresponding size. The irregular ring piece formed by using the method disclosed by the invention is mainly used for fields of aerospace and the like.