155 results about "Mold filling" patented technology

The invention relates to the technical field of resonant pouring castings, in particular to a method for improving the homogeneity of castings in all directions based on resonant pouring, which comprises the following steps: preparing a mold / casting mold, setting resonant parameters, pouring molten metal, maintaining resonance and solidifying, and detecting the homogeneity. Through the resonance effect, molten metal mold filling is uniform, the size qualification rate is increased, meanwhile, grain refinement can be promoted, the isotropic performance uniformity and stability of a casting are remarkably improved, the internal defect rate is greatly reduced, the comprehensive yield is increased, and energy consumption and cost are reduced.

The invention relates to the technical field of process control, in particular to an injection molding process optimization method and device, computer equipment and a storage medium, and the method comprises the following steps: obtaining stress signals of four tie bars of an injection molding machine, calculating a total mold locking force, and preprocessing the stress signals through temperature compensation and moving average filtering; real-time mold cavity pressure is calculated based on a mold filling stage linear model, a pressure maintaining stage quadratic function model and a cooling stage exponential attenuation model triggered by an injection molding machine control signal; generating a standard curve template with a confidence interval according to the characteristic parameters of the qualified sample, and dynamically updating the standard curve template; and comparing the current pressure curve with a standard template output quality judgment result in real time, and triggering automatic parameter adjustment to form closed-loop control. The device and the method have the effect of solving the problems of high cost, poor compatibility and difficulty in maintenance when the pressure of the die cavity is directly measured.

The invention relates to the technical field of cement mortar test mold automatic forming equipment, and discloses a cement mortar test mold automatic forming production line. Comprising a cement mortar test mold automatic forming equipment system, a cement mortar test mold automatic robot curing box equipment system, a cement mortar test mold automatic demolding and demolding equipment system, a cement mortar test mold automatic test mold cleaning equipment system and a cement mortar test mold automatic mold filling equipment system. The cement mortar test mold automatic molding equipment system is used for completing molding of a cement mortar test block in the assembled test mold to form a molded test mold; the cement mortar test mold automatic robot curing box equipment system is used for curing a forming test mold; the automatic forming production line for the cement mortar test mold solves the problems that an existing cement mortar test mold is low in efficiency, unstable in quality, large in labor intensity and large in test mold loss during manual operation from assembling, forming, mold stripping to cleaning.

The invention relates to the technical field of magnesium-aluminum alloy casting, and discloses a magnesium-aluminum alloy high-pressure casting rapid cooling and defect inhibition process which comprises the following steps: S1, mold preheating; s2, nitrogen replacement is conducted; S3, a release agent is sprayed to the interior of the cavity under the inert atmosphere; s4, magnesium-aluminum alloy molten metal with the temperature ranging from 650 DEG C to 700 DEG C is pressed into the cavity at the injection specific pressure ranging from 80 MPa to 120 MPa and the mold filling speed ranging from 5 m / s to 8 m / s; s5, a subarea cooling structure is designed based on the wall thickness difference of different areas of the casting, gradient cooling is conducted on the casting, in the cooling process, the hot train risk is judged by calculating a thermal stress value, and cooling medium parameters are regulated and controlled by calculating a cooling rate value; and S6, the casting is taken out. Traditional cooling is changed into a partition gradient type, defects are controlled according to a formula and AI, double-pipeline nitrogen is used for preventing oxidation, cost is reduced, and technical practicability and innovation are improved.

The invention relates to the technical field of forming casting equipment, in particular to metal impeller forming casting equipment which comprises a low-pressure casting machine body and a crucible, the crucible is arranged under the low-pressure casting machine body, and a casting mold is arranged at the upper end of the low-pressure casting machine body. By the adoption of the bottom-to-top mold filling process, pressurizing feeding of a casting in the solidification process can be achieved, the casting quality is improved, the structure of the liquid rising pipe is optimally designed, uniform mold filling of molten metal during casting is guaranteed, meanwhile, the backflow resistance of the molten metal in the liquid rising pipe can be improved, and impact on the bottom of a crucible due to direct falling of the molten metal is avoided; and the auxiliary cleaning mechanism and the casting mold filling mechanism are matched with each other, so that impurities at the bottom of the crucible are effectively cleaned, meanwhile, the inner wall of the bottom side of the riser tube can be self-cleaned, the impurities are prevented from being mixed into a casting mold, and the quality and efficiency of metal impeller forming casting are further improved.

The utility model discloses a low-pressure casting device for a direct mold filling flywheel casing, and belongs to the technical field of casting of automobile parts. A low-pressure casting device for a direct mold filling flywheel casing comprises a mold piece composed of a lower mold, a side mold and an upper mold, a mold core is arranged in the mold, a mold cavity is formed among the mold core, the lower mold, the side mold and the upper mold, and the low-pressure casting device further comprises a transition connecting device arranged on the lower mold. The transition connecting device is provided with a liquid inlet, a transition cavity and at least two groups of sprue gates, and the transition cavity is communicated with the mold cavity through the sprue gates; according to the utility model, through the arrangement of the transition connecting device, a pouring channel is omitted, a product is directly molded by pouring, solution materials in the pouring gate are saved, and the yield of the product is improved.

The invention relates to the technical field of evanescent mode casting, and discloses an evanescent mode casting process which comprises the following steps: adopting a closed pouring system; setting a pouring temperature; a bottom pouring type pouring system is adopted; a furan resin self-hardening sand core is embedded in the part difficult to fill sand, after a process hole with the diameter smaller than or equal to 50 mm is formed, filling is conducted through an EPS block, sealing is conducted through a high-temperature-resistant adhesive tape, and compaction is assisted through vibration compaction equipment during sand filling; through multi-process collaborative optimization, a full-process controllable lost foam casting system is constructed, the casting density is improved compared with a traditional process, and the tensile strength is improved; the rejection rate is greatly reduced, and the production cycle is obviously shortened; and the dry sand recycling rate is high, and the comprehensive cost is reduced. According to the technical scheme, the problems of discontinuous mold filling, gas retention, dry sand collapse and the like in lost foam casting are solved, and a standardized solution is provided for industrial production of high-end castings.

The utility model discloses a die filling trolley which comprises a machine frame, a motor is fixedly assembled on one side of the upper end of the bottom face of the machine frame, the motor is connected with a driving chain wheel through a speed reducer, the outer wall of the driving chain wheel is connected with a chain in a meshed and sleeved mode, and a tensioning structure is assembled on the other side of the upper end of the bottom face of the machine frame. The chain is connected to the outer wall of the tensioning structure in a meshed and sleeved mode, a plurality of riding wheels are symmetrically assembled at the upper end of the machine frame twice, a plurality of side wheels are symmetrically assembled on the two sides of the upper end of the machine frame and located on the outer sides of the riding wheels, and a hook structure is fixedly assembled at the upper end of the chain. Supporting legs and fixing pin seats are assembled on the two sides of the lower end of the rack correspondingly, through the effect of a hanging structure, mold filling materials can be hung conveniently, meanwhile, the using length of the mold filling device can be adjusted according to needs, and it is guaranteed that the application range is wide, and practicability is high.

Methods and apparatus for artificial bird manufacturing in impact testing is described herein. An apparatus to generate an artificial bird for impact testing includes a mold generator to form a mold based on a bird class identification, a mold filler to fill the mold with a first layer of crushed ice and a second layer of crushed ice, a compressor to compress an ice surface of at least one of the first layer or the second layer of the crushed ice to form indentations on the ice surface, and a freezer to re-freeze the crushed ice layers inside the mold to form an artificial bird.

Method for producing a thermally conductive film (10), comprising: a first step of forming a film or block by pressing and / or rolling a mixture of a binder resin (14) and a first thermally conductive filler (15) with shape anisotropy, which has a plate shape and a main surface thereof or a needle shape and a longitudinal direction thereof, such that the first thermally conductive filler (15) is oriented in a direction of the main surface of the film or block; a second step of hardening the binder resin (14) and then cutting the film or block in one direction of thickness to obtain mold filler pieces (12) such that the first thermally conductive filler (15) in each of them is oriented in the thickness direction of the corresponding mold filler pieces (12); and a third step of mixing the mold-filler pieces (12), a matrix resin (11) and a second thermally conductive filler (13), forming the mixture into a foil mold using pressure rollers, and then hardening the matrix resin (11); wherein the thermally conductive film (10) contains the first thermally conductive filler (15) with its main surface aligned in a thickness direction of the thermally conductive film (10), if the first thermally conductive filler (15) has a plate shape; or else wherein the thermally conductive film (10) contains the first thermally conductive filler (15) with its longitudinal direction aligned in the thickness direction of the thermally conductive film (10), if the first thermally conductive filler (15) has a needle shape, and wherein the matrix resin (11) and the binder resin (14) can be cured by an addition reaction using a platinum group metal catalyst, and wherein the second thermally conductive filler (13) consists of inorganic particles, and the inorganic particles are coated with an R(CH3) a Si(OR') 3-a expressed alkoxysilane compound are surface-treated, wherein R represents a substituted or unsubstituted organic group with 1 to 20 carbon atoms, R' represents an alkyl group with 1 to 4 carbon atoms, and a is 0 or 1.

The invention relates to a sand mold exhaust top box and method for magnesium-lithium alloy low-overheating and overpressure rapid mold filling, and belongs to the technical field of magnesium-lithium alloy casting. Comprising an exhaust unit, a low-pressure transition tank, a sucking pump and an exhaust pipe which are sequentially connected, the low-pressure transition tank is used for balancing pressure during exhausting and preventing smoke dust from being accumulated in the sucking pump; the exhaust unit comprises an exhaust floater, a guide pipe and a valve; the exhaust floater is connected with the low-pressure transition tank through a guide pipe, and a valve is installed on the guide pipe. The exhaust floater is used for exhausting gas and preventing the solution from overflowing after exhaust gas is exhausted. The combined sand mold exhaust top box is adopted to regulate and control the mold filling back pressure of the mold cavity, gas in the mold cavity is rapidly exhausted, and it is ensured that the mold cavity is rapidly filled with melt in the overpressure state.

The invention discloses a mold coating and a casting mold, relates to the technical field of casting manufacturing, and discloses the mold coating which comprises a demolding layer, the surface of the demolding layer has a pore structure; the metal melt is in a Cassie-Baxter state under the condition that the demolding layer is in contact with the metal melt and the pressure applied to the metal melt is smaller than preset critical pressure; and under the conditions that the demolding layer is in contact with the metal melt and the pressure applied to the metal melt is greater than or equal to the critical pressure, the metal melt is in a Wenzel state. According to the mold coating, staged dynamic thermal control can be achieved, efficient heat insulation is provided in the initial stage of mold filling so as to guarantee the fluidity, meanwhile, rapid heat conduction is achieved in the solidification stage so as to promote densification, and then the casting quality can be improved.

The invention discloses a process for producing high-performance cast balls on a V-method production line, which comprises an electric heating box, an air exhaust sand box, a vacuum air exhaust pipeline, a cast ball model, a jolt rammer, a negative pressure box, a sand storage tank and a hydraulic system, the hydraulic system is associated with the electric heating box, and the vacuum air exhaust pipeline is communicated with the air exhaust sand box. The vacuum-pumping V-method production line technology is adopted, the air exhaust sand box is matched with the ball casting model and the model plate to generate negative pressure, molten iron mold filling is smoother, internal casting defects are reduced, meanwhile, only a vacuum pump and a sand storage tank need to be additionally arranged on the V-method production line, equipment is simple and convenient to maintain, and production efficiency is improved. The rectangular plate B on the air exhaust sand box and the rectangular plate A on the model plate are in butt joint and are matched with the sealing embedded blocks to be inserted into the rectangular embedded grooves for positioning, dismounting, replacing and overhauling are convenient, efficient vibration reduction is provided for the vibration compactor through cooperation of the hydraulic buffer rods and the buffer springs and the rubber air bag buffers, and the vibration reduction performance and the vibration compaction effect are improved.

The utility model discloses an extrusion casting machine adopting an electromagnetic pump for low-pressure mold filling. The extrusion casting machine comprises an electromagnetic pump mold filling system, a mold, a sealing and extrusion composite device, a mold locking device, a mold moving device, a guide column, a heat preserving furnace and a lifting mechanism, the lower die is connected with a static template, and the upper die is connected with a movable template; a piston rod of the mold moving device is connected with the movable template; the mold locking device and the sealing and extruding composite oil cylinder are mounted on the movable mold plate; the lower end of the guide pillar is fixed on the static template and penetrates through the center of the mold locking device; the heat preserving furnace is positioned below the static template; the electromagnetic pump mold filling system is fixed on the heat preserving furnace; the electromagnetic pump mold filling system is tightly connected with a lower mold of the mold through a liquid rising pipe; a sealing extrusion composite punch is mounted at the free end of an extrusion piston rod assembly of the sealing extrusion composite oil cylinder; a liquid inlet of the lower mold is communicated with a liquid outlet of the heat preservation furnace through a liquid rising pipe and an electromagnetic pump mold filling system in sequence; the heat preservation furnace comprises a soup adding chamber far away from the liquid outlet, and the soup adding chamber communicates with the liquid outlet through a communicating vessel.

The invention relates to a preparation method of a pure titanium arc-shaped plate for orthopedic implantation, which comprises the following steps: heating a pure titanium bar blank in an online annealing furnace, controlling the furnace temperature at 600-700 DEG C, and keeping the temperature for 5-10 minutes; then carrying out rough rolling on the pure titanium bar blank by adopting a double-roller mill, wherein the rough rolling process sequentially comprises flat rolling, vertical rolling and profile rolling; a four-roller mill is adopted for conducting finish rolling on a product obtained in the rough rolling process, and an arc-shaped blank is obtained; then the arc-shaped blank is placed in an annealing furnace to be annealed, the annealing temperature ranges from 600 DEG C to 700 DEG C, and the annealing time ranges from 1 h to 2 h; then the annealed arc-shaped blank is straightened; and finally, the straightened arc-shaped blank is subjected to sand blasting and acid pickling, and a pure titanium arc-shaped plate finished product is obtained. The R angle of the pure titanium arc-shaped plate prepared through the method reaches the standard in mold filling, the mechanical property is excellent, the human body implantation requirement can be met, and the surface roughness is low.

The invention relates to the technical field of low-pressure casting, in particular to a temperature control pressure relief method for a sprue of a low-pressure casting mold and the low-pressure casting mold, which comprises the following steps: responding to a trigger signal, and acquiring product parameters of a standard finished product according to the trigger signal; mold filling pressure and reference temperature are determined according to the product parameters; collecting a preset real-time pressure on the inner side of the sealed crucible; when the real-time pressure is consistent with the mold filling pressure, tamping parameters are determined according to the product parameters; on the basis of the tamping parameters, a perforated push plate preset in a riser tube is controlled to move up and down in a reciprocating mode, and a cooling signal is sent out after movement is finished; in response to the cooling signal, the molten metal extruded into the cavity under pressure is gradually cooled from top to bottom with a preset cooling method, and the preset judgment temperature of a sprue ring is collected in real time; when it is judged that the temperature is consistent with the reference temperature, the compressed gas is controlled to be discharged out of the sealed crucible at a constant speed through a preset pressure relief method. The method has the effect of improving the accuracy of pressure relief opportunity control.

The invention relates to an automatic mold filling device for concrete test blocks, and belongs to the technical field of mold filling equipment for concrete test blocks, the automatic mold filling device comprises a discharging hopper, a supporting frame is arranged below the discharging hopper, a plurality of supporting rollers are arranged on the supporting frame, a mold is placed on the supporting rollers, a vibration mold scraping mechanism is arranged on the discharging hopper, and the vibration mold scraping mechanism is arranged on the discharging hopper. A conveying mechanism used for conveying the mold is further arranged on the outer side of the supporting frame and connected with a mold cleaning mechanism. The method has the effects of reducing manual operation and improving the working efficiency.

The utility model discloses an auxiliary multi-layer pouring system which comprises a straight pouring rod, an upper-layer transverse pouring gate and a straight pouring gate, wherein a pouring cup is arranged at the top of the straight pouring rod; the upper-layer transverse pouring gate is communicated with the bottom of the straight pouring rod; the straight pouring gate extends downwards from the upper-layer transverse pouring gate; the straight pouring gate is communicated with the three layers of sub-pouring gates and the auxiliary pouring gate, and the three layers of sub-pouring gates and the auxiliary pouring gate are used for injecting pouring liquid into the mold; by arranging the three layers of sub pouring gates and the auxiliary pouring gates, layered mold filling can be conducted on the interior of a mold cavity through molten metal, and turbulent flow is reduced; meanwhile, the pouring mold filling time is shortened; and the upper and lower temperature difference during mold filling can be reduced, so that the temperature field distribution of pouring liquid at the bottom and the top of the cylinder body is balanced.

The application provides a preparation method of a high-performance aluminum matrix composite forging, comprising the following steps: high-energy ball milling of aluminum powder and ceramic powder to obtain mixed powder; isostatic pressing of the mixed powder to obtain a preform; preheating of the preform and then forging sintering to obtain the high-performance aluminum matrix composite forging. The application completes the rapid sintering of the ultrafine aluminum matrix composite powder under pressure, the deformation, flow and mold filling process of the metal fluid through sintering forging technology, synchronously realizes the powder sintering and the forging deformation of the sintered body, and finally obtains the aluminum matrix composite forging with high compactness, high mechanical property and high-temperature stable structure.

The invention relates to the technical field of composite material forming, in particular to a mold filling defect control method and device based on injection structure optimization, computer equipment, a storage medium and a computer program product. The method comprises the steps of obtaining structure information of a target object, and constructing a three-dimensional medium flow model corresponding to the target object based on the structure information; acquiring a plurality of groups of initial mold filling control parameters of the target object, and performing mold filling simulation on the initial mold filling control parameters based on a preset flow control equation to obtain a simulation result; performing simulation analysis on the simulation result, and determining a target mold filling control parameter and a corresponding application simulation result based on the simulation analysis; and generating a process parameter range matched with the target mold filling control parameter and a mold filling defect suppression scheme based on the application simulation result. The method can adapt to a complex structure, the mold filling defect is effectively inhibited, and the process quality is improved.

This invention belongs to the field of numerical simulation of investment casting, and relates to a high-precision numerical simulation method, system, and product for the wax pattern filling process of investment casting. The method includes updating boundary conditions and determining the time step Δt; solving for the flow field, temperature field, and updating the viscosity based on the known field quantities of the current time step; the known field quantities include the flow field and temperature field obtained in the previous time step; performing interface tracking based on the flow field to obtain the free surface between the wax and air, thereby distinguishing between filled and unfilled areas; determining whether to continue time progression according to a preset filling ratio; if time progression is stopped, outputting the results of the flow field, temperature field, viscosity field, and the change of the free surface over time during the entire wax pattern filling process.

The invention discloses a device and a method for preparing a tungsten-copper particle gradient composite material through vibration induction, and belongs to the crossing field of powder metallurgy and material forming machining. Aiming at the problems of powder agglomeration, non-uniform component distribution, difficulty in accurate control of a gradient structure and poor interface continuity in the preparation of a traditional tungsten-copper gradient composite material, a powder mixing-vibration mold filling-hot pressing sintering integrated process is adopted; tungsten copper powder distribution is optimized through a vibration external field capable of being precisely regulated and controlled. High-frequency small-amplitude vibration breaks particle aggregation so as to improve the filling uniformity, and low-frequency large-amplitude vibration guides tungsten copper two phases to form a preset gradient. The preparation device is used for completing powder homogenization and gradient regulation and control, and the tungsten-copper gradient composite material is prepared in cooperation with follow-up spark plasma sintering. According to the method, the vibration external field is only applied in the tungsten-copper particle mold filling stage, the process complexity does not need to be increased, the microstructure uniformity of the tungsten-copper composite material can be remarkably improved, and the gradient structure transition continuity is enhanced. The prepared composite material has the characteristics of high temperature resistance and low expansion of tungsten and high heat conductivity and high electric conductivity of copper, and can be widely applied to the high-end manufacturing fields of electronic power, aerospace, nuclear industry and the like.

The invention discloses an Mg-Al alloy with high fluidity and a preparation method thereof, and relates to the technical field of metal materials, the alloy comprises the following components by mass percent: 8.0-10.0% of Al, 0.4-0.6% of Ca, 3.8-4.2% of Sr, trace Zn, Cu, B, Mn, Cr and the balance of Mg, and the ratio of Sr to Ca is greater than or equal to 6. The preparation method comprises the following steps: under a protective atmosphere, melting the raw materials, refining to obtain an alloy melt, and then casting and forming at 710-730 DEG C. Through the synergistic effect of Ca and Sr elements and the optimization of trace elements, the fluidity of the alloy is improved while the low cost and non-rare earth advantages of the alloy are maintained, the problem that mold filling of large thin-wall components in magnesium alloy integrated die casting is incomplete can be effectively solved, and the alloy is particularly suitable for manufacturing of products such as automobile integrated body frames and battery pack shells.

According to the aluminum liquid suspension system and technology of the automobile aluminum alloy hub low-pressure casting machine, the system comprises a heat preservation furnace, a liquid rising pipe, an air inlet integrated pipeline, a pressure sensor, an electromagnetic valve I, an electromagnetic valve II and a system control module. In the pressure relief stage of die-casting products, the pressure sensor monitors the returned real-time pressure value of the hearth of the heat preservation furnace, and the opening time of the gas electromagnetic valve II of the exhaust pipeline is controlled, so that the pressure value in the hearth is reduced to be within the set pressure value range; and meanwhile, the electromagnetic valve I of the air inlet pipeline controls compressed air of the main air inlet pipeline to supplement and pressurize from the air inlet branch loop to the heat preservation furnace in real time, so that the purpose of stabilizing the pressure is achieved, molten aluminum is suspended in the specific position of the liquid rising pipe, the mold filling time of the die-casting process is shortened, the production efficiency is improved, and meanwhile the product quality is stabilized.

The invention relates to the technical field of metal matrix composite material forming, and discloses a preparation method of a high-strength anti-deformation aluminum alloy gearbox valve plate, which comprises the following steps: smelting an aluminum alloy raw material containing titanium nitride particles; the mixed melt is cooled to a semi-solid state interval with the solid phase rate being 20-50%, and slurry is prepared; the semi-solid slurry is injected into a mold, and 15-30 kHz mechanical pulse vibration is applied to assist forming during mold filling or pressure maintaining; and carrying out two-stage low-temperature aging treatment without high-temperature solid solution and quenching steps on the formed part. According to the method, the problem of contradiction between high strength and high dimensional precision caused by traditional T6 heat treatment is solved by combining low-temperature aging heat treatment with the self-limiting anchoring effect of the dispersed TiN particles. And meanwhile, through the synergistic effect of semi-solid forming and a pulse energy field, the internal density and wear resistance of the casting are improved. The gearbox valve plate prepared by the method has high strength, high dimensional stability, high density and excellent wear resistance.

The invention provides a ceramic pump part and a preparation method thereof. The ceramic pump part is prepared from the following raw materials: silicon carbide particles, carbon black, epoxy resin emulsion, a curing agent, cellulose ether, an inorganic silicon solution and silicon particles. The silicon carbide particles with four-stage particle sizes (500-841 [mu] m, 212-500 [mu] m, 180-250 [mu] m and 109-154 [mu] m) and a specific mass ratio are adopted, so that the solid-phase bulk density is remarkably improved, low-viscosity mold filling is maintained while high solid content is ensured, drying and sintering shrinkage and stress concentration are reduced from the source, and cracking and deformation of large-size or non-uniform-wall-thickness parts are remarkably reduced.

The invention discloses a water-soluble degreased metal powder injection molding process, which belongs to the technical field of metal powder injection molding, and comprises the following steps: pre-drying metal powder; the preparation method comprises the following steps: weighing the following raw materials in parts by weight: 40-60 parts of polyethylene glycol, 0-15 parts of high-density polyethylene, 0-30 parts of polypropylene, 10-30 parts of polymethyl methacrylate, 0-5 parts of polyformaldehyde, 0-7 parts of ethylene-vinyl acetate copolymer, 1-5 parts of stearic acid, 0-10 parts of dioctyl phthalate and 0-10 parts of maleic anhydride grafted polypropylene; performing mixing; dicing is performed; injection molding; degreasing is conducted; performing drying; and sintering. By optimizing a mixed binder formula and a feed preparation process, the fluidity stability of the feed is effectively improved, the feed is prevented from being adhered in a screw rod of an injection molding machine, the continuous and smooth charging barrel feeding and mold filling processes are ensured, the forming interruption or equipment cleaning frequency caused by the feeding problem is reduced, and the production efficiency is improved. And the batch production requirement of metal powder injection molding is met.

The invention provides a measuring device for alloy fluidity in a concentric three-spiral-line thin-wall casting, a using method and a predicting method, and belongs to the field of liquid metal fluidity testing. The method is used for solving the problems that in the prior art, the flowing property and the mold filling property of liquid metal in the thin-wall casting pouring process cannot be accurately measured, and the actual mold filling condition of the thin-wall casting cannot be synchronized through flowing property testing. The device comprises a concentric triple-helix pattern, a sprue pattern, an outer sprue pattern, a lower sand box, an upper sand box and an outer sprue sand box, the upper sand box is mounted on the lower sand box, the concentric triple-helix pattern is mounted in the lower sand box, the outer sprue sand box is mounted on the upper sand box, the sprue pattern is mounted in the upper sand box, and the outer sprue pattern is mounted in the outer sprue sand box. The outer sprue pattern is mounted in the outer sprue sand box, the sprue pattern is connected with the outer sprue pattern, and the concentric triple-helix pattern is expanded in the radial direction of the sprue pattern in the Archimedes spiral direction. The device is mainly used for testing liquid metal fluidity.

The utility model discloses an aluminum alloy metal mold pouring gate structure with a cylindrical filter screen. The aluminum alloy metal mold pouring gate structure comprises a fixed mold, a movable mold, the filter screen and a plug rod, the movable mold and the fixed mold are oppositely arranged; a fixed mold pouring gate is arranged on the fixed mold; a movable mold pouring gate is arranged on the movable mold; the fixed mold pouring gate and the movable mold pouring gate are folded to form a casting pouring gate; the filter screen is cylindrical and is arranged in the casting runner; and the plug rod is arranged above the filter screen and is used for plugging the filter screen into the casting runner. According to the aluminum alloy metal mold pouring gate structure with the cylindrical filter screen, the cylindrical filter screen is installed in an auxiliary mode through the plug rod, the positioning process of the filter screen is simplified, a complex tool clamp is not needed, and the production cost and the operation difficulty are reduced; and meanwhile, impurities in the molten aluminum are effectively filtered, so that mold filling of the molten aluminum is more stable, and the quality of castings is improved.

The invention relates to a machine (1) for manufacturing a concrete voussoir comprising at least one mold (20) having an upper opening for pouring fluid concrete, a filling hopper (10) placed above said upper opening for pouring a determined quantity of concrete, said hopper being provided with a lower pouring orifice and a movable shut-off cap (12) between at least a first closed position and a second open position, and means for vibrating the fluid concrete in the mold (20), characterized in that the hopper (10) comprises a means for measuring the presence of concrete by mass or volume and the machine (1) comprises a level sensor (30) measuring in real time the filling height of fluid concrete poured into the mold (20),said level sensor (30) being connected to the measuring means of the hopper (10) via an automatic control unit (40) to stop the discharge of fluid concrete by moving the hood (12) from the second open position to the first closed position once the fluid concrete poured into the mold (20) has reached a certain predetermined height. Figure for the abbreviation: Fig. 2,