8results about How to "Avoid internal cracks" patented technology

The invention relates to a production method of a continuous casting billet for seawater corrosion resistant steel, and belongs to the technical field of steel. Continuous casting crystallizer casting powder and casting powder layer thickness control are adopted, and the good lubricating effect of the casting powder is guaranteed; according to the section size of a continuous casting machine, surface and internal cracks are prevented from being formed by controlling the continuous casting pulling speed, the superheat degree, the crystallizer water amount, the secondary cooling water amount, the taper, the roll gap shrinkage amount and the like; the center density of the continuous casting billet is improved by controlling the fan-shaped section roll gap shrinkage amount and the soft reduction, the effects of eliminating center shrinkage cavities and looseness and relieving center segregation are achieved, the surface crack occurrence rate of the continuous casting billet for the seawater corrosion resistant steel is smaller than or equal to 0.1%, triangular area cracks are smaller than or equal to 0.5 level, middle cracks are smaller than or equal to 0.5 level, and the center segregation rating is superior to C 1.5 level.

The invention relates to a production method of a continuous casting billet for seawater corrosion resistant steel, and belongs to the technical field of steel. Continuous casting crystallizer casting powder and casting powder layer thickness control are adopted, and the good lubricating effect of the casting powder is guaranteed; according to the section size of a continuous casting machine, surface and internal cracks are prevented from being formed by controlling the continuous casting pulling speed, the superheat degree, the crystallizer water amount, the secondary cooling water amount, the taper, the roll gap shrinkage amount and the like; the center density of the continuous casting billet is improved by controlling the fan-shaped section roll gap shrinkage amount and the soft reduction, the effects of eliminating center shrinkage cavities and looseness and relieving center segregation are achieved, the surface crack occurrence rate of the continuous casting billet for the seawater corrosion resistant steel is smaller than or equal to 0.1%, triangular area cracks are smaller than or equal to 0.5 level, middle cracks are smaller than or equal to 0.5 level, and the center segregation rating is superior to C 1.5 level.

The utility model relates to the technical field of dies, in particular to a forming die of an oxide ceramic product, which comprises a base, a die mechanism is arranged on the base and used for forming the oxide ceramic product, the die mechanism comprises a lower die, an upper die and a lower die, the lower die comprises a lower die holder fixed at the top of the base, and an inner cavity is arranged at the upper end in the lower die holder; four straight grooves distributed circumferentially are formed in the lower end of the interior of the inner cavity, sliding blocks are slidably installed in the straight grooves, a shaping plate is fixed to the upper ends of the sliding blocks, a circular plate is rotatably installed at the lower end of the interior of the lower die base, four arc grooves distributed circumferentially are formed in the outer edge of the upper end of the circular plate, cams are rotatably installed at the lower ends of the sliding blocks, and the cams are located in the arc grooves; a driving piece is mounted on the lower die holder and is used for driving the circular plate to rotate; the upper mold is arranged above the lower mold and is used for compacting the filler in the lower mold; the outer wall of the product and the shaping plate are free of contact friction during demolding, internal damage is avoided, it is guaranteed that no hidden defect exists after sintering, and the quality and yield of finished products are remarkably improved.

This application relates to a stacked interlocking semiconductor packaging structure, comprising: a substrate, a base plate, two chips, a packaging layer, and a protective shell; the substrate is disposed on the top surface of the base plate, and two chips are disposed on the substrate, with the packaging layer encapsulating the chips and the substrate; the protective shell is disposed on the top surface of the base plate and surrounds the sidewalls of the packaging layer; the protective shell includes: two or more stacked rings, each ring having a limiting groove on its inner sidewall, and the packaging layer having multiple limiting protrusions on its sidewalls, the limiting protrusions matching the limiting grooves for embedding within the limiting grooves. The protective shell surrounding the packaging layer effectively isolates and protects the packaging layer, preventing damage caused by direct exposure of the packaging layer's sidewalls to the outside. This application utilizes a stacked, interlocking ring structure to reliably complete the packaging process of microelectronic components or semiconductor devices; the overall structure is simple and easy to manufacture; it has significant advantages in terms of process speed and cost.

The present application belongs to the technical field of food baking, and provides a mousse cake layering forming method, comprising: activating the upper surface of the Nth layer of mousse layer which has been solidified, removing the surface condensate frost and forming micro roughness; adjusting the temperature of the N+1th layer of mousse paste to be filled to be within ±3℃ of the surface temperature of the Nth layer of mousse layer; using a low shear force mode, filling the N+1th layer of mousse paste after temperature adjustment into the Nth layer of mousse layer along the inner wall of the mold or through a flow guide device to obtain a multi-layer mousse assembly; precooling the multi-layer mousse assembly at 4-8℃ for 10-20min, and then freezing and shaping at 18-25℃.

The invention relates to a duplex solid solution treatment process of 68NiCrWCoTiAl alloy, which adopts the duplex solid solution treatment process of cold charging, heat preservation at 1160 DEG C for 1 hour, air cooling, cold charging again, heat preservation at 1080 DEG C for 1 hour and water cooling, can avoid the generation of internal cracks during solid solution treatment in the production process of 68NiCrWCoTiAl alloy material with high crack tendency and difficult to process, and stably meets the final performance requirements. And the qualified rate of solution treatment reaches 100%, the finished product quality is stable, potential quality hazards and risks do not exist, the method has the advantages of being high in feasibility, reliability and yield and good in quality, and a solution is provided for normal manufacturing of the alloy material. The process disclosed by the invention can be suitable for batch production of products.

The efficient welding device for gear machining comprises a top support and a welding gear, a sliding mechanism is arranged at the top of the top support, a sliding frame piece is fixedly installed at the top of the top support through four supporting columns, and four elastic supporting mechanisms are fixedly installed at the bottom of the top support; a bearing placement table is placed in the top surface of the top support by forming a communicating notch; when a rotating motor drives an output shaft and a moving gear piece to rotate and the moving gear piece is meshed with a meshing rack, the active moving effect is achieved, the arc-shaped concave plate base is conveniently driven to slide on the inner side of the sliding frame piece, the active rotating effect is improved, circumferential position rotating adjustment is integrally facilitated, and dead-angle-free movement matched with welding operation is facilitated; therefore, the angle adjustment convenience is improved, a stable structural assembly is provided for welding control equipment, efficient operation and multi-range and multi-angle position adjustment are facilitated, and the operation efficiency is improved.

The invention relates to the technical field of pipeline laying, and discloses a pipeline laying device for a power grid distribution network and a pipeline bending method for the power grid distribution network. The pipeline laying device for the power grid distribution network comprises a bottom plate and a flexible insulation wire fixing plate located above the bottom plate, and one end of the flexible insulation wire fixing plate is fixedly connected with the bottom plate through a first fixing piece; the heating assembly is arranged on the flexible insulation wire fixing plate and makes contact with the outer wall of the pipeline, and the heating assembly is selectively connected with the power source; the driving mechanism is mounted on the bottom plate and is connected with one end, far away from the first fixing piece, of the flexible insulating wire fixing plate; the locking piece is positioned above the bottom plate; when the heating assembly is connected with the power source, the driving mechanism can drive the flexible insulation wire fixing plate to drive the pipeline to be bent, and the bent pipeline is fixed to the bottom plate through the locking piece. According to the pipeline laying device for the power grid distribution network, the pipeline can be bent after being preheated and softened, so that the pipeline is prevented from being broken due to stress concentration at the corner, and the safety and reliability of pipeline laying are improved.