2684 results about "Molten metal" patented technology

The invention provides a low-speed and ultrahigh-pressure die-casting process method for automobile part die-casting, and relates to the field of automobile part manufacturing. The method includes the following steps that firstly, a mold is prepared, secondly, molten metal is prepared, thirdly, a casting is cooled and demolded, and fifthly, follow-up treatment is conducted. The defects that in the high-speed mold filling process of a common high-pressure casting technology, gas is likely to be involved in the molten metal, and consequently air holes, shrinkage porosity and the like are generated in the casting are overcome; and when key parts such as automobile engine cylinder bodies and hubs are produced, air hole defects possibly cause the problems of air leakage of engines, insufficient hub strength and the like. And meanwhile, for parts with thin walls and complex structures, uniform filling of molten metal in a mold is difficult to ensure by a traditional die-casting process, the defects of cold shut, insufficient pouring and the like are easy to occur, and the qualified rate and the production efficiency of products are reduced.

The embodiment of the invention provides a synthesis method and application of lithium sulfide. The synthesis method of the lithium sulfide comprises the following steps: providing a sulfur source and a lithium source; performing first treatment on the sulfur source to obtain sulfur vapor; performing second treatment on the lithium source to obtain molten metal lithium; and in an inert atmosphere, introducing the sulfur vapor into the molten metal lithium, and reacting to generate lithium sulfide. According to the synthesis method and application of the lithium sulfide provided by the embodiment of the invention, the sulfur source is converted into the sulfur vapor, the lithium source is converted into the molten metal lithium, and the gas-liquid out-phase reaction is carried out in the inert atmosphere, so that the reaction efficiency and the purity are improved, the process is simplified, the cost is reduced, and the high-purity requirement can be met; the purity can be improved through raw material pretreatment of sulfur steam and molten metal lithium, and the strict requirement of a solid-state battery for high-purity lithium sulfide is met.

Disclosed in the present application are a dual-sided laser synchronous welding heat source model establishment method, a dual-sided laser synchronous welding heat source simulation method, a dual-sided laser synchronous welding system, and a medium. Firstly, combined heat sources each comprising a Gaussian cylindrical heat source attenuation model and a Gaussian surface heat source correction model are established, and a dual-sided laser synchronous welding heat source model is established by means of a rotating coordinate system; a three-dimensional geometric model and a three-dimensional mesh model of a T-joint are established; and the consistency between simulated molten metal morphology and an actual weld shape is used as a criterion for determining whether parameter settings of the dual-sided laser synchronous welding heat source model are rational, so as to obtain an optimal finite element simulation heat source model. By establishing two heat sources each obtained by combining a Gaussian cylindrical heat source attenuation model and a Gaussian surface heat source correction model, and symmetrically applying the two heat sources to two sides of a T-joint to act on the interior and surface of a weld, the present invention realizes the accurate simulation of a weld penetration zone in a T-shaped thin-plate weldment, and thus enables the prediction of residual stress and welding deformation during a design phase, thereby optimizing the welding process, improving the welding quality and efficiency, and reducing material waste and production costs.

The invention discloses a crankshaft marking machine, which relates to the technical field of marking machines and comprises a supporting seat, a mounting assembly is arranged at the top of the supporting seat, a rotating assembly for transferring a crankshaft is arranged on the mounting assembly, a supporting plate is fixedly connected to the top of one side of the supporting seat, and a laser marking machine for marking the crankshaft is arranged at the top of the supporting plate. A cleaning assembly for collecting sweeps generated in the marking process is arranged on one side of the laser marking machine. According to the crankshaft marking machine, under the elastic acting force of a third damping spring, an arc-shaped clamping block can be tightly attached to the surface of a crankshaft, stable clamping is achieved, the stability of the crankshaft in the marking process is guaranteed through the clamping mode, marking quality reduction caused by vibration or shaking is reduced, and marking reliability and safety are further improved; and the crankshaft can be effectively vibrated through reciprocating knocking of the knocking rod, so that tiny sweeps or molten metal particles generated in the laser marking process fall off from the marking groove, and a marking area is kept clean.

The invention relates to the technical field of die casting, in particular to a feeding and injection device of a die casting machine. Comprising a charging barrel, a punch, an injection rod, an injection oil cylinder, a charging barrel sealing plate, a liquid inlet pipe and a driving part, the charging barrel is arranged in the fixed plate, the injection oil cylinder is arranged below the fixed plate, a punch is arranged in the charging barrel, a sealing plate is arranged on the side edge of the charging barrel, a guide structure is arranged on the sealing plate and matched with the charging barrel, a driving component is arranged on the bottom side of the sealing plate and fixed to the fixed plate, and the sealing plate moves under the action of the driving component. A charging barrel opening in the side surface of the charging barrel is opened and closed. When the sealing plate is in an open state, molten metal in the liquid inlet pipe begins to enter the charging barrel through the opening, the sealing plate closes the side opening of the charging barrel, the punch presses the molten metal into a mold cavity under the action of the injection oil cylinder, and a die-casting product is obtained after cooling forming. By adopting the opening and closing mode of the sealing plate, the time or the cooling degree of molten metal in the charging barrel is reduced, the feeding precision and efficiency are improved, and the injection period is shortened.

The invention discloses special protective clothing capable of preventing molten metal from splashing and application of the special protective clothing. The special protective clothing comprises a fireproof coat and a fireproof knitted underwear, the fireproof coat is a one-piece fireproof coat, and the fireproof knitted underwear is a fireproof knitted long-sleeve underwear; the fireproof coat is made of an anti-splashing fabric, and the anti-splashing fabric comprises a flame-retardant layer, an aerogel heat insulation layer and a base layer from outside to inside; the flame-retardant layer, the aerogel heat insulation layer and the base layer are bonded into the anti-splashing fabric by adopting a full-thickness puncture sewing process; the fireproof knitted underwear is made of non-combustible fiber, flame-retardant fiber and antistatic fiber blended fabric. The protective clothing has multiple functions, the fireproof coat and the fireproof knitted underwear both have permanent flame-retardant protective performance, can be used independently and can be worn according to different special operation scene requirements, the comprehensive utilization performance of the protective clothing is improved, and the purpose of reducing the use cost is achieved.

A furnace vessel of an arc furnace is loaded with solid metal. Afterward, an energy supply device of the arc furnace feeds electrical energy to electrodes of the arc furnace via a furnace transformer to form arcs between the electrodes and the metal, the arcs melting the metal. Finally, the molten metal is removed from the furnace vessel. The number of electrodes is at least three. For at least two of the electrodes, the energy supply device individually sets the operating frequency (fa, fb) of the relevant electrode. The current (Ic) through the third electrode is defined by the current (Ia, Ib) through the first and the second electrodes. Which of the electrode is the first electrode, which is the second electrode, and which is the third electrode is assigned dynamically.

The invention discloses a coaxial composite laser welding method and a welding method of a flat wire motor winding, and relates to the technical field of laser welding, coaxial composite laser beams are adopted to act on the surface of a high-reflection material to form a welding pool, the coaxial composite laser beams comprise an outer ring laser beam and a core laser beam, the outer ring laser beam is a pulse laser beam, and the core laser beam is a core laser beam; the core laser beam is a continuous laser beam, the continuous laser beam forms a main molten pool, the pulse laser beam forms an auxiliary molten pool, and the main molten pool and the auxiliary molten pool have overlapped parts. The continuous laser and the pulse laser are combined, the main molten pool formed by the continuous laser and the auxiliary molten pool formed by the pulse laser are communicated in an overlapped mode, the pulse laser disturbs molten metal in the auxiliary molten pool and drives the molten metal in the main molten pool to achieve the oscillation stirring effect, and the laser energy absorption efficiency of the high-reflection material can be improved; and the energy distribution of the heat source can be optimized by adjusting the energy proportion and the focus point position, the energy state of the heat source is accurately controlled, and zero splashing is achieved.

The invention relates to the technical field of die-casting devices, in particular to a die-casting device and a die-casting method for a high-toughness light-weight aluminum alloy structural member. The upper die, the lower die and the metal tank filled with molten metal are respectively arranged on the die-casting frame; the synchronous transmission mechanism is arranged in the die-casting frame and connected with the upper die, the lower die and the metal tank, and the synchronous transmission mechanism and the horizontal reciprocating conveying mechanism share the same motor for driving; the pretreatment mechanism comprises a heating frame, a release agent spraying frame and an air drying frame. The whole system is driven by one power source, the production cost is effectively reduced, the operation difficulty is reduced, the subsequent maintenance and control work becomes easier, the power source has high universality and easy replaceability due to the adoption of an electric driving mode, and the power source is suitable for large-scale popularization and application. And the maintenance efficiency and the availability of the equipment are greatly improved.

The invention discloses a method for preparing a lithium-copper composite negative electrode by utilizing lithium slag and application, and the preparation method of the negative electrode comprises the following steps: adding the lithium slag with certain concentration after removing impurities such as Ca < 2 + >, Mg < 2 + > and Fe < 3 + > through acid treatment into metal lithium in a molten state, and fully stirring until the reaction is complete; and coating the molten metal lithium obtained after the reaction on a current collector to obtain the modified lithium metal negative electrode plate. The prepared lithium-copper composite negative electrode has a lithium-loving 3D frame structure, volume expansion in the circulation process can be inhibited, lithium oxide, lithium aluminum alloy and lithium silicon alloy existing on the 3D frame structure can serve as lithium-loving sites for uniform lithium ion deposition, lithium dendrite growth is inhibited, and long-term stable circulation of the lithium metal negative electrode is promoted.

The invention relates to a gasification method based on molten metal, belongs to the technical field of recycling of recyclable and renewable resources such as household garbage, industrial garbage and biomass, and solves the problem that same-quality or high-quality utilization cannot be realized due to incomplete decomposition of macromolecular organic matters in the prior art. Secondary pollution to the environment is caused, and the like. According to the gasification method based on the molten metal, the molten metal serves as a medium and a heat source, a material containing a high-molecular compound is subjected to a decomposition gasification reaction under the action of a gasification agent, and inorganic mixed gas including CO and H2 is generated. The same-quality and high-quality reutilization of recyclable and renewable resources such as household garbage, industrial garbage and biomass is realized.

The invention provides a control operation method for a discharge robot of a rare earth metal electrolytic furnace, which comprises the following steps: the discharge robot acquires the electrolytic state of the electrolytic furnace through a visual sensor, and judges whether the electrolytic state reaches a discharge standard or not; after it is judged that the discharging standard is met, a discharging robot grabs a discharging tool, the discharging tool is preheated, and the discharging tool is moved to the discharging position to prepare for discharging; the discharging robot moves along the planned path, the contact force between the robot and the electrolytic furnace is monitored through a force sensing system, the track of the robot is corrected according to the contact force, and the discharging process is executed; after the discharging process is finished, whether discharging continues or not is judged, and if not, the process is finished. The molten metal discharging standard is judged in real time through the visual sensor, the position of the furnace opening is dynamically calibrated, tool deformation is monitored, flexible control over the tail end is achieved through the force sensor, damage to the furnace body in the digging operation is avoided, manual participation is reduced, and the operation efficiency is greatly improved.

The invention provides a casting and forging composite forming method and die for an aluminum alloy structural part. A certain downward pressing amount is reserved for a male die; the cavity is filled with the metal melt at a certain speed under the pushing of the injection punch; increasing the pressure of the punch and maintaining the pressure (indirect extrusion casting); the pressurizing pin is started to carry out local pressurizing feeding; and the male die moves downwards by a certain distance, high pressure is applied, and closed die forging is conducted on the casting in the semi-solidified state. The mold structure comprises a shell part, a forming part, a flash storage and exhaust part, a pouring system, a temperature adjusting and monitoring system and a demolding system. The extrusion casting process and the closed die forging process are integrated in one set of die and are achieved through the extrusion casting machine, the performance of a final product is better than that of an extrusion casting method, the forming process is easier to achieve compared with forging, meanwhile, the production cost is lower, and the method is particularly suitable for forming machining of high-performance safety parts, structural parts and complex parts.

The invention discloses a manufacturing method of 925 silver jewelry, which comprises the following steps: S1, preparing alloy components, S2, designing a cast tree structure, S3, casting, and S4, densifying a casting, the alloy components comprise 92.5-93.0% of silver, 1.0-3.0% of platinum, 0.05-0.5% of copper, 1.5-3.5% of zinc, 1.5-3.5% of indium, 0.03-0.3% of tin, 0.05-0.5% of germanium, 0.03-0.3% of rare earth, and 0.003-0.02% of boron. According to the manufacturing method, alloy components are optimized, the casting performance of the alloy components is improved, the casting process is optimized, the feeding capacity of molten metal is improved, shrinkage porosity and air holes are reduced, the initial density of the casting is improved, and subsequent composite treatment is carried out, so that the density from the surface to the shallow surface of the casting is further improved, grains are refined, and the surface roughness is further reduced; and the requirement of high brightness of the jewelry surface is met.

The utility model relates to the technical field of laser cutting, and discloses a thin metal plate laser cutting machine which comprises a laser cutting head, an installation support is installed on the outer wall of the laser cutting head, a small motor is installed at the end, away from the laser cutting head, of the installation support, and a power gear is installed at the output end of the small motor. According to the thin metal plate laser cutting machine, the position, located on the outer side of the laser cutting head, of the surface of a metal plate is polished through rotation of the polishing piece, residual molten metal on the surface of the metal plate is polished through polishing of the polishing piece, and therefore the smooth effect of the surface of the metal plate at the cutting position is improved, and the cutting quality is improved; and through cooperation of an inner adsorption magnet and an outer adsorption magnet, chippings generated by polishing are adsorbed, and the situation that the metal chippings generated by polishing are left on the surface of a plate, additional cleaning work needs to be conducted, and the subsequent laser cutting quality can be affected when the metal chippings are left on a cutting route is prevented.

The invention provides a multilayer heterogeneous material ultrafast laser integrated connection method and device, and the method specifically comprises the steps: stacking and fixing a chip bonding pad, a spring pin and quartz glass on a three-dimensional motion platform, and adjusting the platform to enable a laser focal plane to be located at the center of the pin; aiming at the connection of a bonding pad and a pin, high-repetition-frequency ultrafast laser with a high Rayleigh length is obtained through spatial shaping, a two-dimensional galvanometer is used for carrying out spiral line or concentric circular ring scanning to act on the periphery of the pin, metal plasma is excited, molten metal is formed and deposited in a contact hole of the pin and the bonding pad, and the molten metal is continuously accumulated along with reverse heating, so that the metal is formed. Dissimilar metal welding is achieved; aiming at the connection of the pin and the glass, laser penetrates through the quartz glass, plasma is excited on a metal interface, molten metal with increased volume is formed, a material interface gap is filled, and welding from non-optical contact to optical contact is regulated and controlled; and two heterogeneous materials are successfully welded through single scanning until welding of the whole pin array is completed, and efficient integrated packaging is achieved.

The invention relates to a vacuum electron beam welding method for platinum-iridium alloy, which comprises the following steps: S1, pre-treating a platinum-iridium alloy plate to be welded, S2, fixing the pre-treated platinum-iridium alloy plate, and enabling a to-be-welded area to be tightly connected and to be positioned in an electron beam welding working area; s3, electron beam butt joint parameters and welding parameters are set, vacuumizing is conducted, the platinum-iridium alloy plate to be welded is preheated, and welding is conducted; and S4, after welding is completed, a weldment is cooled. According to the welding method, the technical defects existing in platinum-iridium alloy welding are overcome, the machinable range is wide, after welding, a platinum-iridium alloy plate and a welding area are not oxidized, impurity elements are not introduced, the volatilization loss of platinum-iridium precious metal is extremely small, and the uniformity of molten metal components and structures of a weld joint is guaranteed. And after welding, the connection strength is reliable, welding defects such as cracks and air holes do not exist, the mechanical property is close to that of a platinum-iridium alloy welding joint, the welding quality is excellent, and a new optional thought is provided for the platinum-iridium alloy machining technology.

The invention discloses a smelting process monitoring system of a medium-frequency electric furnace and a process guidance method of the smelting process monitoring system. The system comprises an edge acquisition terminal and a cloud platform, the edge acquisition terminal comprises an intermediate frequency voltage transmitter used for acquiring a voltage signal at the output side of the intermediate frequency electric control cabinet and converting the voltage signal into a first analog signal; the intermediate-frequency current transmitter is used for collecting a current signal at the output side of the intermediate-frequency electric control cabinet and converting the current signal into a second analog signal; the analog quantity conversion module is used for converting the first analog signal and the second analog signal into digital signals; the intelligent thermodetector is used for measuring the temperature of the molten metal in real time and sending temperature data; the cloud platform is used for receiving and processing the digital signal and the temperature data and storing high-frequency sampling data; identifying a smelting stage through an LSTM network; power control is optimized on the basis of a Transform model and a GAN model; and integrating an expert knowledge base and providing process guidance. According to the system, comprehensive digitization and real-time accurate sensing of the smelting process are achieved; and the timeliness and scientificity of decision making are improved.

The invention provides a multi-scale simulation method for high-fidelity selective laser melting forming and phase field-lattice Boltzmann coupling, and belongs to the technical field of selective laser melting numerical simulation. The method comprises the specific steps that a selective laser melting powder laying process model is constructed based on a discrete element method, and a randomly stacked powder bed model is obtained; a high-fidelity selective laser melting forming thermal fluid dynamic model is established, and macroscopic temperature distribution and flow field distribution of a molten pool are simulated; establishing a phase field model-lattice Boltzmann coupling model; and extracting temperature gradient, solidification velocity and melt flow velocity data of local positions of the boundary of the steady-state molten pool, and simulating solidification structure evolution under flowing of molten metal in the molten pool by taking the data as initial conditions of the phase field-lattice Boltzmann coupling model. According to the method, through high-fidelity multi-scale simulation, the relation between the process parameters and the microstructure is established more comprehensively, and reliable numerical support is provided for selective laser melting process optimization and microstructure prediction.

The invention relates to the technical field of rare earth metal hydrometallurgy, in particular to a rare earth molten salt electrolysis truss type multifunctional metal output system and a control method.The system comprises a main body supporting and moving frame, an integrated function execution module set, a bottom cleaning function module, an electrolytic bath station unit and an intelligent control system; wherein the integrated function execution module group, the bottom cleaning function module, the electrolytic tank station unit and the intelligent control system are respectively arranged in the main body support and motion frame, and the main body support and motion frame is arranged in a gantry truss structure; the four functions of pot lifting, casting, cooling and bottom cleaning in rare earth electrolysis are integrated on the integrated bearing platform of the same gantry truss type rack, and through multi-sensing information fusion and intelligent control, the system can automatically complete the whole process operation of crucible extraction, molten metal casting, cooling forming and electrolytic bath bottom cleaning; and the exposure of workers in high-temperature and high-risk environments is obviously reduced, and the production safety and efficiency are improved.

The invention relates to the technical field of die-casting processes, in particular to a shell die-casting cooling method and system.The method comprises the steps that the shell die-casting cooling process is simulated and analyzed through computer simulation software according to shell features, and the optimal layout and size of a cooling pipeline in a die-casting die are determined; a determined cooling pipeline is machined on the die-casting die, and a temperature sensor and a flow control valve are installed to monitor the temperature of the shell in each area and the temperature and flow of a cooling medium in the cooling process in real time; molten metal is injected into the die-casting die, and an air cooling system is started for primary air cooling; after the shell is preliminarily formed, a water cooling system is started, and sectional type cooling is adopted according to a computer software simulation result; the temperature sensor collects shell temperature data in real time and transmits the shell temperature data to the control system in real time, and the control system automatically adjusts the flow and temperature of a cooling medium through the flow control valve according to a preset temperature curve. And after water cooling is finished, the air cooling system is started again, and secondary air cooling is conducted on the shell.

Provided is an Al alloy for casting, which can achieve both high mechanical properties and cost reduction. An Al alloy for casting according to the present invention contains 8.0 to 10.0 mass% of Si, 0.25 to 0.40 mass% of Mg, 0.30 to 0.50 mass% of Fe, 0.28 to 0.52 mass% of Mn, 0.08 to 0.22 mass% of Cu, 0.04 to 0.15 mass% of Ti, and 0.0075 to 0.028 mass% of Sr, with the balance being Al. The sum of the Fe content and the Mn content is limited to 1.0 mass% or less. Sr is not added in the dissolution step, but is added in a molten metal treatment step in which the Al oxide and H2 gas in the Al alloy molten metal obtained in the dissolution step are removed.

The invention relates to the technical field of sand casting, in particular to a device and method for eliminating air holes in sand casting, comprising a mounting support, a bottom plate is arranged above the mounting support, a top plate is arranged above the bottom plate, and four ends of adjacent sides of the bottom plate and the top plate are fixedly connected with limiting frames; a round disc is fixedly connected to the center of the bottom of the bottom plate, and a spherical groove is formed in the bottom of the round disc; the mobility of molten metal in the cavity is improved through rotation of the mold, the molten metal can flow into a complex structure of the cavity, the cavity filling integrity is improved, it is guaranteed that gas in the molten metal has sufficient time to volatilize, and therefore generation of air holes is further reduced, and the product quality is improved. And as the pouring mold of the molten metal gradually returns in the inclined state, the molten metal is kept horizontal after pouring is completed, and the uniformity of mold filling of the cavity is guaranteed.

The invention relates to a casting method for a low-pressure alloy casting of a riser-free sand mold. The casting method comprises the steps that molten alloy is injected into a casting cavity through a plurality of flow gates in the bottom of the casting cavity in a low-pressure mode for mold filling; during mold filling, the variable-diameter air outlet needle arranged above the casting cavity is used for exhausting air; after mold filling is completed, stepped pressurization and pressure maintaining are conducted on the molten metal in the casting mold cavity; and when the casting is solidified, the thick and large part at the top of the casting cavity is cooled in an accelerated manner, so that the casting is solidified from bottom to top and from the thin-wall area to the thick-wall area. Through bottom multi-pouring-gate mold filling and top variable-diameter gas outlet needle gas exhausting, splashing is prevented. And step pressurization and pressure maintaining are carried out after mold filling, and a thick-wall area is forcibly fed. During solidification, solidification is formed from bottom to top and from thin to thick. A riser is replaced with pouring gate feeding, precise exhaust and solidification control are combined, the feeding and exhaust problems of riser-free casting are solved, riser cutting and polishing are avoided, and meanwhile it is guaranteed that a casting is compact and high in quality.

The invention provides a laser cutting machine for bedstead production, and belongs to the technical field of bedstead production, the laser cutting machine comprises a rack and a laser cutting head arranged at the upper end of the rack, a first rotating chuck is arranged in the rack, and a second rotating chuck used for supporting a pipe is arranged at the upper end of the rack; the upper end of the rack is slidably connected with a mounting base through a sliding rail, a rotating disc is rotatably connected into the mounting base, a positioning disc is hinged to the middle of the rotating disc, a limiting assembly is arranged in the middle of the mounting base and used for limiting the positioning disc, and a scraper used for cleaning the inner wall of a pipe is arranged in the middle of the positioning disc. An air ring is rotationally connected to the middle of the positioning disc and communicates with an air hole in the middle of the positioning disc; grid bars are arranged in the rack in a left-right array mode. According to the device, molten metal filings can be cooled by introducing cooling gas into the pipe, and the metal filings adhered to the inner wall of the pipe can be cleaned in a centralized mode.

The invention relates to the technical field of casting molds, and discloses an automobile planet carrier casting mold which comprises a mold plate arranged between an upper mold and a lower mold, an upper sand mold, a lower sand mold, a sand core and a sprue are installed on the mold plate, and the sand core is located between the upper sand mold and the lower sand mold and used for blocking cavity communication of the upper sand mold and the lower sand mold; guide columns corresponding to the upper and lower dies are mounted on the upper and lower end faces of the template, and are inserted into guide holes of the upper and lower dies, so that accurate die assembly is realized. Through combination of the upper sand mold, the lower sand mold and the sand core, the mold can mold an upper casting and a lower casting at the same time by using the sand core to block communication of the mold cavity, the production efficiency is greatly improved, the thickness of the sand core is set to be 0.8 times of the wall thickness of the casting, shrinkage porosity linearity caused by a hot spot in the casting can be avoided, and meanwhile, the production efficiency is improved. The pouring gate supplies liquid to the upper sand mold and the lower sand mold through the residue filter, impurities in molten metal are removed through the filtering assembly, the shrinkage porosity defect caused by the impurities is reduced, and therefore the qualification rate of castings is increased.

The present invention relates to the field of valve welding technology, and discloses a valve welding tool, comprising: a supporting and positioning mechanism, a pressure valve opening and closing structure is provided inside the supporting and positioning mechanism, a valve locking mechanism is installed on the surface of the opening and closing locking structure, a pressure plate blocking mechanism is provided on one side of the valve locking mechanism, and a valve locking mechanism is provided on one side of the pressure plate blocking mechanism. The valve welding tool, through the supporting and positioning mechanism, the pressure valve opening and closing structure, the valve locking mechanism, the pressure plate blocking mechanism and the valve locking mechanism, can ensure the fixation of the valve during use while also protecting the input port and output port of the valve, thereby preventing molten metal from easily falling into the interior of the valve during welding, and can forcibly operate the handle with both hands to open and close the connecting cross column during use, thereby forming a fool-proof design, preventing the user from taking and placing the valve while holding the welding gun, and improving safety.

The invention discloses a molten metal fluidity improving method and system in the V-method casting process, and relates to the technical field of casting, a high-pressure airflow and mechanical brush composite mode is adopted for cleaning a casting mold cavity and preheating the casting mold cavity, and precoated sand is selected for preparing a sand mold through vacuum negative-pressure compaction; a sectional type negative pressure regulation and control strategy is adopted, and the stepped composite pouring gate structure is optimized; degassing the molten metal by argon or nitrogen, controlling the temperature, and adding an inoculant and a flow promoter in proportion; the casting speed is controlled according to the three-section type rate through the casting table with the adjustable inclination angle; arranging an insulated riser at the thick and large part of the casting, maintaining a negative pressure field after casting, and covering an insulating material; dividing cooling areas according to wall thickness, and gradually relieving pressure after cooling to a set temperature; and after shot blasting and flaw detection, recording data and establishing a process parameter-flowability association database. Through mold preheating, negative pressure gradient regulation and control and pouring gate design improvement, the molten metal fluidity is remarkably improved, and the casting quality stability and the production efficiency are greatly improved.

The invention relates to the technical field of valve welding, and discloses a valve welding tool which comprises a supporting and positioning mechanism, a pressure valve opening and closing structure is arranged in the supporting and positioning mechanism, a valve locking mechanism is installed on the surface of the opening and closing locking structure, and a pressing piece plugging mechanism is arranged on one side of the valve locking mechanism. And a lock valve opening and closing mechanism is arranged on one side of the pressing sheet plugging mechanism. According to the valve welding tool, through the arranged supporting and positioning mechanism, the pressure valve opening and closing structure, the valve locking mechanism, the pressure sheet plugging mechanism and the valve locking opening and closing mechanism, the valve can be fixed during use, meanwhile, an input port and an output port of the valve can be protected, molten metal liquid is prevented from easily falling into the valve during welding, and the welding quality is improved. In the using process, opening and closing of the connecting transverse column can be achieved only by forcibly operating the shifting handle with two hands, so that fool-proof design is formed, a user does not need to take and place a valve when holding a welding gun, and safety is improved.

The invention discloses a plasma cutting device for power supply processing, and relates to the technical field of plasma cutting. Comprising a rack, a cutting knife is arranged on the top of the rack, a cutting control system is connected with the cutting knife, a positioning mechanism is arranged at the bottom of the rack and comprises a positioning outer cylinder arranged on the rack, and a positioning disc is rotationally installed in the positioning outer cylinder and composed of a first end plate, an inner ring and a second end plate; limiting mechanisms are arranged on the first end plate and the second end plate in an array mode respectively. A scraping and shielding mechanism is arranged on the inner side of the inner ring, workpieces are arranged on the limiting mechanisms on the positioning disc and rotate along with the positioning disc, the scraping and shielding mechanism scrapes residues on the inner wall of the positioning outer barrel, and a removing mechanism is arranged at the bottom of the positioning outer barrel and used for scraping the inner side area of the positioning disc; the protective measures can be perfected, molten metal residues splashed during cutting are shielded and protected, and follow-up cleaning is convenient and fast.