13results about How to "Uniform solidification" patented technology

The invention discloses a method for preparing a metal casting mold based on steel grit 3D printing, and belongs to the technical field of metal casting mold machining. In order to solve the technical problem that in the prior art, the mechanical strength and collapsibility of a metal casting mold need to be further improved, the method for preparing the metal casting mold based on steel grit 3D printing comprises the following steps that a sand mold three-dimensional model is established according to a metal casting, then casting mold steel grit is filled in an operation box of sand mold 3D printing equipment, and the casting mold steel grit is obtained; the binder storage tank is filled with a binder; and according to the section formation of the sand mold three-dimensional model, a sand paving system of the sand mold 3D printing equipment paves cast steel sand on a printing platform. The casting steel sand and the binder are matched with each other, the metal casting mold blank is prepared through 3D printing and then dried, the normal-temperature mechanical property and high-temperature property of the metal casting mold are effectively improved, the application range of the metal casting mold is widened, and meanwhile the collapsibility of the metal casting mold is improved.

A casting system for a front end cover casting of a wind power gear box comprises a pouring system and a casting cavity, and the pouring system is communicated with the casting cavity. The pouring system comprises a straight pouring gate, a transverse pouring gate, a first transition pouring gate, a foam filter, a second transition pouring gate and an inner pouring gate which are communicated with one another; the straight pouring gate is vertically communicated with one end of the transverse pouring gate, the first transition pouring gate is transversely connected to one side wall of the transverse pouring gate, the foam filter is arranged below the first transition pouring gate, and the second transition pouring gate is connected to the lower portion of the foam filter. One end of the ingate is connected below the second transition runner, and the other end of the ingate is communicated with the lower bottom surface of the casting cavity; the number of the ingates is six, the length of three ingates is larger than that of the other three ingates, and the tail ends of the six ingates are connected to different positions of the lower bottom face of the casting cavity in a scattered mode. And solidification can be effectively balanced, the defects of upper plane shrinkage concave, local shrinkage cavity or shrinkage porosity of the casting are overcome, and the yield of the casting is improved.

The invention discloses a machining process of a centrifugal impeller in the technical field of pouring processes, and the machining process comprises the following steps: preparing a sand core: preparing an impeller mold, filling a sand core material into the mold, compacting, and taking down the mold after the sand core material is hardened and formed, so as to obtain the sand core; sand mold manufacturing, specifically, the upper swage mold and the lower swage mold are sleeved with a rectangular frame-shaped mold box, the mold box is filled with a sand core material and compacted, and an upper sand mold and a lower sand mold are obtained after hardening; when the lower sand mold is manufactured, a U-shaped ceramic tube is placed, and one end of the ceramic tube is communicated with the bottom of a cavity of the lower sand mold; mold closing is conducted, specifically, the sand core is placed in a cavity of the lower sand mold, and the upper sand mold and the lower sand mold are assembled; casting: injecting molten steel into the sprue, filling the cavity with the molten steel through the ceramic tube, and cooling to obtain the impeller; and sand mold removal: after the impeller is cooled, removing the residual sand core material on the surface of the impeller by using a tool. According to the scheme, the problems of wrinkling and low cold shut defects of the impeller caused by an existing impeller pouring process are solved.

The invention relates to a metal liquid flow control method, device, equipment, medium and system for negative pressure suction casting, and the method comprises the steps that the heating power of a heating piece corresponding to a crucible plugging block is adjusted based on the target suction casting time corresponding to metal liquid in a crucible, and the heating piece comprises a laser transmitter; based on an infrared receiver, the number of received light points is obtained, and the number of received light points is used for representing parameters of the condition that the molten metal flowing out of the crucible blocks infrared transmission; and if the number of the received light points is lower than the target light point number range, it is judged that melting of the crucible plugging block is completed and the molten metal flows out of the crucible, the heating piece is controlled to stop heating, and the suction casting pump is controlled to be started so that the suction casting pump can conduct negative pressure suction casting on the molten metal. The suction casting pump is automatically controlled to be started, the accuracy of identifying the flowing state of the molten metal is improved, it is ensured that the whole mold filling process is stable and efficient, the flowing mold filling efficiency of the high-temperature melt is improved, and the quality of negative pressure suction casting is improved.

The invention relates to the technical field of sand boxes, in particular to a wind generating set planet carrier co-container sand box which is characterized in that an upper sand box inner container, an upper sand box shell and an upper sand box outer frame are connected through a plurality of upper connecting rods penetrating through the upper sand box inner container, the upper sand box shell and the upper sand box outer frame; a sprue is formed in the upper part of the cope flask shell and is communicated with the cope flask inner container; the lower sand box inner container, the lower sand box shell and the lower sand box outer frame are connected through a plurality of lower connecting rods penetrating through the lower sand box inner container, the lower sand box shell and the lower sand box outer frame, each lower connecting rod is sleeved with a hollow sleeve, and the upper end of each hollow sleeve is connected with the outside through an upper through groove formed in the lower sand box shell. The lower end of each hollow sleeve is connected with the outside through a lower through groove formed in the bottom of the lower sand box outer frame, through the structure, balanced solidification and directional solidification of a casting are achieved, shrinkage porosity is reduced, and therefore the casting technology without the chilling block riser is achieved.

According to the intelligent casting device based on the digital boiling cooling channel and the control method of the intelligent casting device, firstly, high-performance low-pressure anti-gravity stable mold filling of metal melt is achieved, and then intelligent and high-cooling-speed metal melt high-performance solidification is achieved based on the digital boiling cooling channel. By means of the method, stable mold filling of low-pressure anti-gravity casting can be achieved, the defects of gas entrapment, oxidation slag inclusion and the like are reduced, sufficient feeding under pressure solidification is ensured, the problems of shrinkage cavities, shrinkage porosity, hot cracks and the like are reduced, and therefore a compact structure is obtained; and intelligent cooling speed enhanced solidification and sequential solidification of castings in any shape in a three-dimensional space can be realized based on a digital boiling cooling channel, a solidification structure with refined grain structure, small secondary dendritic crystal arm spacing and few defects is obtained, and finally, a high-performance high-end complex casting is produced.

The invention relates to the technical field of building auxiliary components, and discloses a built-in positioning prefabricated member reinforced concrete shear wall which comprises a shear wall body, the shear wall body comprises a bearing layer, a reinforcing mesh is arranged on the inner side of the bearing layer, a positioning part is arranged outside the reinforcing mesh, and the positioning part comprises a positioning seat connected with the bearing layer and a heat preservation layer. The bottom end of the positioning seat is fixedly connected with a positioning piece, a fixing piece and a connecting piece are arranged on the outer side of the positioning piece, and the fixing piece, the connecting piece and the positioning piece jointly form a whole. The positioning part is arranged, so that positioning and fixing of the reinforcing mesh are achieved, the reinforcing mesh and the positioning part form an integral structure, damage to the shear wall main body caused by hoisting stress concentration is avoided, side supports of the hoisted shear wall main body are limited, and it is guaranteed that concrete is uniformly solidified in the pouring process before hoisting; the stress of the device is uniform in the hoisting process, and the device is stably supported after being hoisted.

The application provides a continuous casting production method of tinplate, which comprises the steps of dynamic control of a pulling speed, linkage control of cooling, dynamic adjustment of an insertion depth of a submerged nozzle and dynamic argon blowing, wherein the pulling speed control is based on the maximum section steel flow, the target pulling speed is calculated reversely according to the actual section, and the steel flow of each section is constant; the cooling water flow is compensated in linkage with the increment of the pulling speed, and the bulging of the shell is inhibited; the insertion depth of the nozzle adopts a one-way increasing insertion mode from shallow to deep in multiple stages; and the argon blowing flow is adjusted in stages according to the fluctuation of the crystallizer liquid level. The application can reduce the nozzle clogging area by more than 50%, the standard rate of liquid level fluctuation is increased to 95%, the continuous casting castability and the surface quality of the casting blank are significantly improved, and the application is suitable for the efficient and stable continuous casting production of tinplate and other aluminum-containing steels.

The invention relates to a preparation method of a retaining ring composite electroslag ingot, belongs to the technical field of electroslag remelting smelting, and solves the problems that in the prior art, a retaining ring forge piece has forging cracks and is poor in surface quality, and an existing composite steel ingot has component difference and is complex in preparation process. According to the preparation method of the retaining ring composite electroslag ingot, the bottom, the main body part and the top of the composite electroslag ingot are made of different materials, and the preparation method comprises the following steps that 1, electrodes of the main body part of the composite electroslag ingot are prepared; step 2, preparing an electrode at the end part of the composite electroslag ingot; step 3, preparation before electroslag remelting of the composite electroslag ingot; 4, sequentially completing remelting of the bottom, the main body part and the top of the composite electroslag ingot in an electrode replacement mode; and 5, cooling solidification and demolding are conducted, specifically, after the steel ingot obtained after smelting is completed is subjected to mold cooling for 5-6 hours in a crystallizer, demolding is conducted, and the composite electroslag ingot with the end part and the main body part made of dissimilar materials is obtained. And the preparation of the retaining ring composite electroslag ingot with high metallurgical quality is realized.

The utility model belongs to the technical field of roller casting equipment, and particularly relates to multi-channel type roller casting equipment which comprises three casting equipment bodies, a base is arranged at the bottoms of the casting equipment bodies, three auxiliary plates are evenly connected to the top end of the base, and the three auxiliary plates are arranged on the base. An annular groove is formed in the top end of the auxiliary plate, and through holes are formed in the top end of the base and the top end of the auxiliary plate. The multi-channel type roller casting equipment has the advantages that bubbles in pouring liquid are effectively promoted to rise to the surface and break, and therefore the defects of bubbles, gaps, air holes and the like in a casting after the pouring liquid is solidified are remarkably reduced; the compactness and the overall quality of the casting are improved, the pouring liquid is more uniform in the solidification process due to vibration, and the phenomena of stress concentration and non-uniform solidification caused by local premature solidification are avoided. The mechanical performance of the casting can be improved, and the surface quality and the size precision of the casting can be improved.

The invention provides a welding bottom plate structure and photovoltaic cell welding equipment with the same. The welding bottom plate structure comprises a bottom plate main body, at least three groups of through holes and an air draft component, the at least three groups of through holes are formed in the bottom plate main body at intervals in the first direction, each group of through holes comprises a plurality of through holes which are formed at intervals in the second direction, and each through hole comprises at least two hole sections which are communicated in sequence; the air draft component is arranged at the bottom of the bottom plate body and communicates with the at least three sets of through holes so as to conduct air draft on the interiors of the through holes. Wherein the first direction is perpendicular to the second direction, and the cross sectional area of the through hole is gradually increased in the direction from the top face to the bottom face of the bottom plate body. The problem that tin is not solidified after welding and the yield is affected due to the fact that a battery welding bottom plate is not cooled in time in the prior art is solved.

The utility model relates to a temperature control device for bridge cable hot casting anchor anchoring material casting, relates to the device of hot casting anchor anchoring material casting, including at least one installation dynamic heat preservation device on the anchor cup, dynamic heat preservation device includes annular sleeve, heat preservation device, temperature sensor, control system, the inner hole of annular sleeve is covered on the outer surface of anchor cup, heat preservation device, temperature sensor are installed in the closed cavity of annular sleeve respectively, the signal output end of temperature sensor is connected with the signal input end of control system, the signal output end of control system is connected with heat preservation device, the utility model discloses through heat preservation device can make the anchoring material in the anchor cup keep proper temperature, solve the problem of the insufficient compactness caused by the big void ratio of anchoring material and the uneven casting, further promote the anchoring efficiency, can also reduce the thermal stress crack in the cooling process of casting, significantly improve the anchoring material quality.

The invention relates to the technical field of metallurgy, in particular to a production control method for reducing net cracks in the process of rolling a steel plate by a red-fed casting blank, the steel plate production steps comprise the procedures of converter smelting, refining, continuous casting and rolling, and the specific operation comprises the following steps: (1) controlling the nitrogen content of molten steel in the converter smelting procedure; (2) controlling the content of acid-soluble aluminum in molten steel in a refining process; (3) in the molten steel pouring process of the continuous casting procedure, whole-process protection pouring is adopted, the pulling speed is controlled, and nitrogen content detection is conducted on molten steel in a tundish; and (4) performing a forced cooling mode on a bending section of a continuous casting machine in a continuous casting process, and controlling the surface temperature of a casting blank to be not more than 610 DEG C when the casting blank enters a steel rolling heating furnace. The compactness and uniformity of the casting blank can be improved, the fine grain proportion of the casting blank is increased, coarse grains are avoided, precipitation of nitrides and inclusions in a high-temperature two-phase region of the casting blank is reduced, and grain boundary cracking of a steel plate during steel rolling is avoided.