394 results about "Investment casting" patented technology

The invention relates to the technical field of investment casting, and particularly provides an investment casting automatic wax pattern welding equipment control method which comprises the following steps: extracting a peak value and duration from heating curve data, and judging a uniformity numerical value of interface temperature distribution through a numerical simulation method; according to the fusion depth change trend and the interface temperature distribution data, the quantized value of the quality index is calculated, and an evaluation result of the welding effect is obtained; if the quality index quantized value is lower than a preset threshold value, historical test data are extracted from a data analysis module, and the adjustment range of the process variable is determined; according to the process variable adjustment range, optimizing the parameter combination of the heating curve and the pressure curve, and generating new control strategy data through an iterative algorithm; new control strategy data is adopted to drive equipment to operate, and dynamic feedback values of the interface temperature and the fusion depth are obtained through a real-time monitoring system; and extracting abnormal fluctuation data from the dynamic feedback value, and judging the influence degree of the solidification rate change on the quality index in combination with a data analysis result.

The invention relates to the technical field of titanium alloy investment precision casting, and particularly provides a titanium alloy multistage deep blind hole investment casting method which comprises the following steps: designing an exhaust hole and a slag removal hole; establishing a model; assembling and welding; soaking the surface layer in a vacuum negative pressure environment, continuously vacuumizing, deflating after soaking, taking out the module, and rotating to uniformly control the slurry; preparing a surface layer; performing segmented grouting on the deep blind hole; making a shell from a back layer; roasting and molding; washing and drying; pouring is conducted; shell cleaning and sand blasting; sealing and welding the process holes; and performing stress relief annealing. And a dynamic vacuumizing means is adopted, and a vacuumizing device is always kept in an open state, so that the compactness of a surface layer is improved, and burrs of a casting are reduced. Through vacuum dynamic slurry immersion, segmented grouting and collaborative design of the exhaust hole and the slag removal hole, investment precision casting forming of the high-precision oil pump shell can be supported, the shell manufacturing efficiency of the multi-stage deep blind hole is improved, and the filling defect rate is reduced.

The invention relates to the technical field of investment mold shell casting, in particular to an investment mold shell casting system which comprises a rack, a slurry barrel, a roasting furnace, a cooling barrel and a slag collecting barrel are sequentially installed on the rack in the clockwise direction, and multiple sets of regularly-distributed elastic striking rods are installed on the inner wall of the slag collecting barrel. A loading and unloading station is arranged at the position, corresponding to the position between the slurry barrel and the slag collecting barrel, of the machine frame, a casting frame is installed on the machine frame in a liftable mode, a transmission unit is arranged on the casting frame, and the transmission unit is in transmission connection with a rotating station frame capable of periodically rotating by 72 degrees and a rotatable transmission gear ring. The casting equipment has the beneficial effects that casting links such as ceramic slurry coating, roasting, cooling and slag collecting are integrated into the same equipment, and the orderly circulation of a parison among the links is realized through the slurry barrel, the roasting furnace, the cooling barrel and the slag collecting barrel which are sequentially arranged on the rack in the clockwise direction and the rotary station frame capable of periodically rotating.

A method of making an object through investment casting includes additively manufacturing a mold for the object with a printing head on a carriage supported by a frame with the mold being additively manufactured from multiple layers on a build platform supported by the frame. An interior surface of the mold is machined with a machining device on the carriage after a predetermined number of layers have been added to the mold through additive manufacturing. The object is investment cast by directing a casting material into the mold while the mold is supported by the build platform.

The invention relates to the technical field of precision investment casting, in particular to an optical lens motor base precision forming die which comprises a fixing plate, a forming mechanism is arranged at the top of the fixing plate, and an upper die plate is arranged at the top of the forming mechanism; the forming mechanism comprises a butt joint unit arranged in the center of the top of the fixing plate, the butt joint unit comprises a main body fixedly connected with the fixing plate, a first ejector block is slidably connected to the position, close to the bottom, in the main body, and lifting blocks are arranged at the positions, located on the periphery of the first ejector block, in the main body; a butt joint rod is slidably connected to the center position in the first ejector block, and a pressing block is slidably connected to the position, below the butt joint rod, in the main body. Through linkage of the module assembly and the butt joint unit, the problems of wax mold demolding deformation cracking and parting surface steps are solved, and the integrity of the wax mold is guaranteed; by means of linkage of the cutter and the exhaust groove, residual wax is automatically cleaned, manual operation is not needed, shrinkage porosity is avoided, and the structural stability of the base is guaranteed.

The invention relates to the technical field of investment casting, in particular to a preparation method of a high-dimensional-precision ceramic core and a casting forming method. The preparation method of the high-dimensional-precision ceramic core comprises the following steps: (a) designing a ceramic core structure and a wax shell structure for preparing the ceramic core structure according to the structure of a casting; (b) preparing a wax shell structure by adopting photosensitive resin in a 3D printing manner; (c) pouring slurry into the wax shell structure, and roasting to obtain a ceramic core; the slurry comprises silica sol, polyacrylamide and zircon powder, the mass ratio of the silica sol to the polyacrylamide is 100: (0.02-0.06), and the mass ratio of the zircon powder to the silica sol is (2.5-3.5): 1. The photosensitive resin is used for manufacturing the wax shell, so that the surface quality and the size precision of the manufactured ceramic core can be improved; moreover, a certain amount of polyacrylamide is added into the slurry for preparing the ceramic core, so that the production cycle of the ceramic core is remarkably shortened, and meanwhile, the raw material cost is low.

The invention provides a preparation method of a zirconium acetate surface layer shell for titanium alloy precision investment casting, which comprises the following steps: S1, taking a zirconium acetate binder and an anti-redissolution inhibitor, adding an adhesion promoter and deionized water under a stirring condition, and uniformly stirring to obtain a surface layer binder; s2, mixing a surface layer binder with the surface layer refractory powder, adding a wetting agent, and uniformly dispersing the materials to obtain a surface layer coating; s3, performing vacuum negative pressure defoaming on the surface layer coating; s4, in a vacuum negative pressure state, after the wax mold is subjected to uniform slurry soaking in the surface layer coating and pressure maintaining is conducted for 60-300 s, sand spraying and drying are conducted on the wax mold subjected to slurry soaking, and a surface layer shell is obtained; s5, a dewaxing hole of the surface layer shell is opened, and staged hot steam dewaxing is carried out; s6, the dewaxed surface layer shell is roasted, and a shell is obtained; according to the method, redissolution of the zirconium gel surface layer can be effectively inhibited, the compactness of the surface layer can be improved, and the conditions of redissolution, peeling, falling and the like of a zirconium gel surface layer shell process in titanium alloy precision investment casting can be obviously improved.

The invention relates to the technical field of investment casting, in particular to an investment casting shell making method of an air inlet casing casting and a shell. The method comprises early-stage preparation (high-precision wax mold manufacturing and module assembling), a shell manufacturing process (shell manufacturing of a surface layer, a transition layer and a back layer) and subsequent procedures (dewaxing, roasting, pouring, cleaning and detecting). The surface layer and the transition layer are dried by silica sol-based paint (zircon powder / mullite powder) in cooperation with strong wind power, so that the surface quality and the initial strength are ensured; the back layer is hardened by adopting a water glass-based coating (coal gangue powder) matched with ammonium chloride, so that the supporting strength and air permeability of the main body are provided. By optimizing a composite shell-making material system and process parameters, the problem that in the prior art, the strength, the air permeability, the quality and the efficiency of a shell are difficult to consider at the same time is solved, and the method is particularly suitable for production of complex thin-wall castings such as aero-engine air inlet casings with extremely high requirements for the surface quality, the size precision and the internal structure; the defects of air holes, slag inclusion and the like can be effectively reduced.

The invention discloses a preparation method of a ceramic core plasticizer for high-temperature alloy investment casting, and relates to the technical field of plasticizers, and the preparation method comprises the following preparation steps: step 1, adding microcrystalline wax into modified chlorinated paraffin, heating, stirring and melting, adding a heat stabilizer, mixing, continuously stirring, heating for reaction, adding polyethylene wax, and continuously stirring; 2, after cooling, adding stearic acid, and continuously stirring; and 3, granulating and packaging to obtain the special plasticizer for the ceramic core. According to the preparation method of the ceramic core plasticizer for high-temperature alloy investment casting, polar groups such as hydroxyl groups and ester groups are introduced to a chlorinated paraffin molecular chain, strong interaction is formed between the polar groups and hydroxyl groups on the surface of ceramic powder, and a uniform wax coating layer is formed on the surface of powder particles.

The invention discloses an Nb-Si-Ti-Cr-Al-Hf alloy turbine ultrahigh-temperature investment casting method. The method comprises the following steps: preparing an alloy turbine ultrahigh-temperature investment casting shell; performing ultrahigh-temperature investment casting on the alloy turbine; and post-processing the alloy turbine casting. The microstructure and the mechanical property of the Nb-Si-based alloy are improved through alloying, the solidification path of the alloy is changed, the eutectoid reaction of metastable-phase Nb3Si is promoted, and the comprehensive performance is improved. Through the rare earth yttrium oxide shell, the problem that the alloy reacts with the shell is solved; high surface quality, strength and thermal shock resistance of the alloy turbine are ensured by regulating and controlling the powder-liquid mass ratio of the slurry and the number of shell layers; and a casting of which the tail end of the blade can be completely filled and has no metallurgical defect is cast through an induction suspension smelting technology, so that the alloy turbine cast by the ultra-high-temperature investment casting can meet the actual application requirement.

In order to improve the metallurgical quality of a thin-wall casting in the investment casting process, the invention provides a novel control method based on machine learning and a sequential solidification principle. The method comprises the steps that firstly, geometric structure parameters related to the solidification process are calculated on discretization representation of a casting model, and the geometric structure parameters comprise the distance from a local position to a casting head, the geometric modulus and the mold shell thickness; secondly, in combination with a numerical simulation result, a random forest algorithm is used for establishing a mapping model of geometric structure parameters and solidification time of the casting, and R2 on a verification set is 0.9974; based on the model, the gradient of a solidification curve on a geodesic path is quantitatively adjusted in combination with measures of local formwork thickness reduction and heat preservation cotton coating, and sequential solidification is achieved. And after optimization, the total shrinkage porosity volume of the casting is reduced to 24.78 mm < 3 > from 71.69 mm < 3 >, and is reduced by 65%. The effectiveness of the method is further verified through a pouring experiment, an efficient and quantitative solution is provided for shrinkage porosity control of the thin-wall complex casting, and a new thought is provided for intelligent control over investment casting defects.

The present application relates to wax mold technology field, disclose a kind of large thin-walled wax mold and for wet wax precision casting production process, including fixing frame, the fixing frame is provided with electric push rod, movable mould and fixed mould, the movable mould, fixed mould is provided with heat dissipation mechanism, the movable mould is provided with stripping mechanism, the fixed mould is provided with top pressure mechanism and wax injection port, the movable mould is also provided with rotating mechanism, the rotating mechanism includes motor and locking piece.The present application can demould the workpiece, while avoiding the workpiece from being stuck in the fixed mould, thereby greatly improving the practical convenience, and after demoulding the workpiece, water-based release agent can be sprayed in the fixed mould and movable mould, thereby avoiding the need for manual spraying of water-based release agent, and the forming effect and forming quality of the workpiece can also be improved, finally the locking piece can be automatically driven to contact and lock the fixed mould, thereby greatly improving the practicality and convenience of use.

The invention discloses a multi-stage composite sand cleaning method and system for investment casting of a narrow inner cavity casting, and relates to the technical field of investment casting, the method comprises the following steps: S1, primary shot blasting cleaning is carried out to remove floating sand on the outer surface of the casting and a shallow inner cavity, and a deep sand inlet is exposed; s2, inner cavity impact sand loosening is conducted, specifically, a sand body blocked in the deep portion of the inner cavity of the casting cracks and loosens through pneumatic impact; s3, ultrasonic vibration sand removal is conducted, specifically, the casting is installed on a special tool, loose sand grains are stripped from the inner cavity wall through ultrasonic vibration output by an ultrasonic generation unit, and a tuning control module is arranged to conduct real-time scanning on the casting and adjust the frequency of the ultrasonic vibration so as to be matched with the local resonance frequency of the inner cavity of the casting; s4, secondary shot blasting finishing is conducted, falling residual sand in the casting is removed, and surface finishing is achieved; and efficient, thorough and damage-free sand removal of sand grains in narrow, bent and deep inner cavities of the casting is realized through the multi-stage sand removal step.

The invention relates to a jeweler's rubber mold pressing device that ensures the alignment and placement of a two-part (upper and lower) rubber mold used in the injection of wax into rubber molds for jewelry investment casting technology. This is achieved by pressing the mold and aligning it with the injection nozzle of the injection machine in both vertical and horizontal directions, and then pushing it onto the nozzle.

The utility model discloses a sand spraying machine for investment casting, which is characterized in that the upper end of a base is provided with a sand spraying barrel body, the side wall of the upper end of the sand spraying barrel body is provided with a fixing bracket for fixing a wax mold, the upper end of the sand spraying barrel body is provided with a sand screening mechanism, the sand screening mechanism comprises an annular sand screening plate, and the sand screening plate is inclined downwards from the outer end to the inner end; the sand spraying barrel body comprises a coarse material collecting cavity formed in the middle and a fine material collecting cavity formed in the outer end, a bottom plate of the coarse material collecting cavity is higher than a bottom plate of the fine material collecting cavity, the sand spraying machine further comprises a sand pumping mechanism used for conveying sand in the fine material collecting cavity to the position above the outer end of the sand screening plate, and the inner end of the sand screening plate extends to the upper end of the coarse material collecting cavity. According to the sand spraying machine, the sand spraying barrel body is divided into the coarse material collecting cavity and the fine material collecting cavity, fine materials fall onto a wax mold from screen holes of the sand screening plate to be subjected to sand spraying operation, coarse sand directly falls into the coarse material collecting cavity through the sand screening plate to be recycled, efficient screening, conveying and recycling of the sand are achieved, and the utilization efficiency of the sand is improved.

The application relates to the technical field of investment casting and discloses an exhaust manifold investment casting equipment based on a hierarchical cooling shaping structure, which comprises a mold group, a main pipe core-pulling module and a branch pipe core-pulling module, the inside of the mold group is provided with a mold cavity, and the inside of the mold group is provided with a cooling pipeline; wherein the main pipe core-pulling module comprises a sliding block one, and the side close to the mold group of the sliding block one is fixedly installed with a core-pulling block. The exhaust manifold investment casting equipment based on the hierarchical cooling shaping structure can effectively solve the problem that, in the prior art, the conventional investment casting wax injection mold usually adopts an integral fixed core-pulling structure, and when the core-pulling is performed on the main pipe end of the exhaust manifold, due to the complex inner cavity curved surface at the intersection of the main pipe and the branch pipe of the exhaust manifold, the diameter of the arc connection at the intersection is greater than the diameter of the outer end of the main pipe, the contact area between the core body of the existing core-pulling structure and the inner wall of the wax mold is large, the friction force is strong, and the inner wall of the wax mold is prone to scratching, pilling and even tearing.

The utility model relates to the technical field of wax liquid processing, in particular to a stirring device for investment casting wax liquid, which comprises a tank body, the top of the tank body is connected with a cover in a pluggable manner, the outer part of the tank body is fixedly connected with a reinforcing ring, the bottom end of the tank body is fixedly connected with supporting legs, and an extension rod is fixedly connected between the supporting legs. The top end of the inner side of the tank body is fixedly connected with a bearing plate, the bottom of the bearing plate is fixedly connected with a funnel, the bottom of the funnel is fixedly connected with an extension cylinder, the funnel is communicated with the interior of the extension cylinder, the inner side wall of the funnel is provided with a filter screen, and the bottom of the extension cylinder is fixedly connected with a sleeve; compared with an existing stirring device for the investment casting wax liquid, the stirring device for the investment casting wax liquid has the advantages that through the design of the filter screen and the scraping rod, solid-liquid separation of the wax liquid can be rapidly completed, the inner wall of the tank body is cleaned, and the overall practicability is greatly improved.

The invention relates to the technical field of investment casting, in particular to a method for reducing microporosity of a secondary aluminum alloy and an investment casting method. The method for reducing microporosity of the secondary aluminum alloy comprises the following steps that secondary aluminum alloy molten metal is poured into a mold shell, cooling and solidification are conducted after pouring is completed, and a casting is obtained; pressurizing a pouring chamber where the mold shell is located at the beginning of pouring, and stopping pressurizing until the molten metal is cooled to 400 DEG C; during pressurization, pressure is applied, so that the initial pressure P0 of the pouring chamber is 1.2-4 times of the standard atmospheric pressure. According to the method, in the pouring process of the secondary aluminum alloy molten metal, certain pressure is applied, so that microporosity of the surface and the interior of the secondary aluminum alloy casting can be greatly reduced, and the yield of the casting is greatly improved.

The present invention provides a high-temperature titanium alloy for casting at 650°C and a method for investment casting thereof. The titanium alloy comprises: Al: 5.5-6.5%, Sn: 2-4%, Zr: 2-8%, Hf: 4-8%, Mo: 0.5-1.5%, Nb: 0.5-1.5%, Ta: 1-2%, W: 1-2%, Y: 0.1-1%, Si: 0.2-0.4%, and Ti: the balance. The present invention uniformly mixes Y2O3 refractory powder of varying particle size distributions with a slightly alkaline binder of a silicon-yttrium composite sol, and also uniformly mixes bauxite powder, carbon fiber, and a silica sol binder to produce a mold shell surface layer and a reinforcement layer suitable for investment casting of a high-temperature titanium alloy at 650°C. Melting is performed in a suspension melting furnace, resulting in a method for melting a high-temperature titanium alloy at 650°C and a centrifugal casting process. The castings produced by this method are free of defects such as hot cracks, cold cracks, shrinkage, and pores, and the room temperature properties are: tensile strength ≥1100MPa, yield strength ≥950MPa, and elongation ≥5%; the high temperature properties at 650℃ are: tensile strength ≥650MPa, yield strength ≥580MPa, and elongation ≥8%.

The invention discloses a method for controlling deformation of a margin plate of a turbine guide blade. The method comprises the steps that the easily-deformed part of the margin plate of the turbine guide blade and the corresponding structure size are determined; based on the structure size of the easy-to-deform part of the margin plate, the structure sizes of the target structural member, the first open slot and the second open slot are determined; based on the structural size of the target structural part, a corresponding special mold is determined, and the target structural part is prepared through the special mold; based on the structural size of the second open groove, the second open groove is designed in the blade mold core; based on the structural size of the first open groove, the first open groove is designed in the blade wax mold; the blade mold core and the target structural part are installed in a blade wax mold; and the blade wax mold is used for wax mold preparation, a target wax mold is obtained, and the target wax mold participates in the investment casting process, so that the turbine guide blade with the controllable margin plate deformation is obtained. By means of the method, deformation of the turbine guide blade margin plate can be controlled, and the production qualification rate of turbine guide blades is increased.

The utility model relates to the field of investment casting, and discloses a wax mould forming device for precision castings, which comprises a machine table, a hydraulic rod is mounted at the top end of the inner wall of the machine table, a fixing mechanism is arranged at the bottom end of the inner wall of the machine table, the fixing mechanism comprises a positioning assembly and a fine adjustment assembly, the positioning assembly comprises a lower supporting plate, and the fine adjustment assembly comprises a lower supporting plate. The bottom end of the lower supporting plate is fixedly connected to the bottom end of the inner wall of the machine table, a fixing hole is formed in the top end of the lower supporting plate, a lower mold is placed at the top end of the lower supporting plate, an upper mold is connected to the top end of the lower mold in an inserted mode, and multiple sets of positioning rods are connected to the inner wall of the fixing hole in an inserted mode. According to the utility model, by arranging the adjustable fixing mechanism and the wax conveying assembly, the positions of the fixing mechanism and the wax conveying assembly can be freely adjusted during processing, the processing point position can be freely changed by adjusting the positions of the fixing mechanism and the wax conveying assembly, and meanwhile, the fixing mechanism can assist an operator in aligning a mold with a wax injection head.

The utility model relates to the field of investment casting, in particular to an investment casting shell cleaning device which comprises a bottom plate, a supporting frame is arranged above the bottom plate, a placing frame is fixedly connected to the upper surface of the supporting frame, two supporting frames are slidably connected to the upper surface of the placing frame, and a clamping block is fixedly connected to the top end of each supporting frame. Each supporting frame is fixedly connected with a first driving piece, and a first driving rod is arranged below the containing frame. Through the arrangement of the supporting frame, the first driving piece and other components, the first driving piece can drive the clamping blocks to move through the supporting frame through the mutual matching relation between the supporting frame and the first driving piece, and therefore the clamping blocks can clamp the two ends of the module; therefore, the effect of fixing the modules of different sizes through the arrangement of the supporting frame and the first driving piece is achieved, and the defects that an existing technical scheme is lack of a clamping mechanism, and the modules are prone to falling off are overcome.

This invention relates to the field of casting polishing technology, specifically to a high-precision automotive casting silica sol investment casting post-processing device, comprising a housing, a shot blasting unit, and closed doors. The shot blasting unit is installed on the housing, and two symmetrical closed doors are hinged to the front surface of the housing. A conveying mechanism for transporting the casting into the housing is provided on the upper surface of the housing. The processing device also includes a hoisting mechanism for loading the casting as a whole. The hoisting mechanism is mounted on the conveying mechanism. The conveying mechanism drives the hoisting rod to make the casting revolve inside the housing. Simultaneously, a support mechanism allows the casting to rotate on its own axis during the revolution. During the revolution, the casting is intermittently tilted upwards, enabling all-round polishing of the casting without dead angles, improving polishing efficiency, and resulting in better polishing effect.

The invention discloses a liquid cooling drive pump body investment casting wax mold production wax injection mold, which comprises an upper mold, a lower mold, a slide block, a mold cavity and a loose piece, the bottom of the upper mold is provided with a first mold cavity groove, the lower mold is arranged right below the upper mold, the top of the lower mold is provided with a second mold cavity groove, and the slide block is arranged in the second mold cavity groove. A plurality of sliding block mounting grooves are formed in the surface of the top of the lower mold around the outer side of the second mold cavity groove, the sliding blocks are arranged in the sliding block mounting grooves in a one-to-one correspondence mode, the mold cavity is used for forming the wax mold and jointly formed by the upper mold, the lower mold and the sliding blocks, and the multiple movable blocks jointly form an inner cavity complex structure of the wax mold. The cavity is formed by the upper mold, the lower mold and the multiple sliding blocks, the wax mold in the cavity adopts a one-time mold splitting forming process, and the wax piece is taken out by mutually positioning and combining the movable blocks and splitting the mold in the complicated structure of the inner cavity, so that water-soluble wax does not need to be used as an inner cavity core-pulling core, water-soluble wax does not need to be dissolved in water in the subsequent process, and split welding is not needed; the mold splitting efficiency is improved; and the cost is reduced.

This application provides a method, apparatus, and equipment for detecting shell occupancy, relating to the field of casting process and quality inspection technology. It addresses the technical problems in related technologies where, during the investment casting production process, the detection of abnormal occupancy of the loading pallet and the mold chamber pallet via an automatic transfer system for transferring cold and hot shells is inaccurate, and abnormal shell posture cannot be identified in a timely manner. The method includes: acquiring pallet image information; determining the pallet occupancy status and shell posture status based on the pallet image information; acquiring a transfer command signal; generating an abnormal status signal based on the pallet occupancy status, the transfer command signal, and the shell posture status; adjusting the transfer command signal based on the abnormal status signal and the pallet image information to generate a real-time control signal; and controlling the transfer system to perform corresponding operations based on the real-time control signal.

This utility model relates to the technical field of investment casting drying equipment, specifically a sand shell drying device for investment casting. The drying chamber contains two symmetrically arranged limiting frames, each with a guide groove. A support plate is also provided inside the drying chamber, with both sides of the support plate inserted into the guide groove and slidably connected to the limiting frames. A tray is rotatably mounted on the support plate. A first motor is fixedly mounted below the support plate, and the output end of the first motor has a first rotating shaft connecting to the tray. A second motor drives the support plate to extend out of the drying chamber, allowing workers to directly place sand shells outside the chamber. This avoids the difficulty of loading materials due to the limited space inside traditional equipment, making it particularly suitable for mass production scenarios and significantly improving sand shell manufacturing efficiency.

The utility model relates to the field of lost wax investment casting technology, especially a kind of lost wax investment casting sand shell removal knocking tool.Its technical scheme includes: handle and knock head, the handle includes handle and connecting rod, the outer ring of handle is equipped with antiskid sleeve, the inner ring between the antiskid sleeve and handle is provided with rubber sleeve, the connecting rod is provided with positioning assembly.The utility model is set up four groups of different shapes of knocking surface on knock head, can adapt to sand shell of different angles and shapes, improves the efficiency and pertinence of knocking, reduces the damage to casting surface, improves the comfort and stability of operator holding by the setting handle setting antiskid sleeve and rubber sleeve of handle outer ring, guarantees the stability of knock head and handle when being in assembly state by the setting positioning assembly, it is convenient for operator to quickly dismount and replace knock head, can select appropriate knock head according to different sand shell conditions, improves the versatility and practicality of tool.

The utility model provides a turnover type slurry preparation barrel, and belongs to the technical field of investment casting equipment. The turnover type slurry preparation barrel comprises a barrel body, a fixing frame and a turnover device, a movable frame of the can body is fixedly connected with a can body, a bottom plate in a fixed frame is located at the bottom of the frame, and trundles are located on the bottom plate. The turnover device comprises a rotating wheel, an input shaft, a first mounted bearing, a second mounted bearing, a coupler, a speed reducer, an output shaft, a third mounted bearing and a turnover position fixing mechanism; the rotating wheel, the first mounted bearing, the coupler and the input end of the speed reducer are coaxially connected in sequence, and the first mounted bearing and the second mounted bearing are located on the input shaft and fixedly connected with the frame. The bottom of the speed reducer is fixedly connected with the frame; the input shaft is vertical to the output shaft; the output end of the speed reducer penetrates through the third mounted bearing through an output shaft, the output shaft is a flange type solid shaft, a flange at one end is fixed to the movable frame, and the turnover position fixing mechanism is located on the input shaft. The device has the advantages of being simple in overall structure and convenient to operate manually, the labor intensity of workers can be reduced, waste is reduced, and cost is reduced.

The invention provides an investment casting cooling device and a cooling method thereof, and relates to the technical field of investment casting cooling, the investment casting cooling device comprises a corrugated pipe, the corrugated pipe can be arranged according to a hot spot area or a key cooling area of a casting, the flow direction of a cooling medium can be well controlled through the corrugated pipe, so that the area needing to be cooled is controlled, and the cooling efficiency is improved. And the air outlet in the corrugated pipe deviates from the pouring gate, so that the pouring gate is effectively prevented from being cooled, feeding can be more effectively carried out, and the technical problems that in the prior art, the action range of liquid nitrogen airflow flowing at a high speed is difficult to accurately control, and a feeding pouring gate system is inevitably affected while a casting body is cooled are solved.

The present invention provides a method for preparing a mold shell for investment casting, comprising a wax part preparation step and a shell layer preparation step, wherein the wax part preparation step is performed before the shell layer preparation step, and the wax part preparation step comprises a raised portion preparation step, wherein raised portions are prepared on the surface of the wax part, and at least some of the raised portions are uniformly distributed in a plane or arc surface area of ​​the wax part surface, and the plane or arc surface area occupied by a single raised portion is 40-400 cm 2 At the same time, the present invention provides corresponding investment casting shells and investment casting wax parts. The present invention solves the technical difficulties such as drill steel, low-density inclusions and steel leakage caused by poor quality of the shell surface layer of oversized precision castings with no allowance.