31results about How to "Avoid defects such as pores" patented technology

The invention relates to a re-sintering method for firing imitated Song Jun official porcelains based on a nano ferric oxide glaze and series of fired imitated Song Jun official porcelains. According to the method, nano ferric oxide is added to a basic glaze and is directly glazed in a form of a basic ingredient of the glaze and then fired, so that the defects that a conventional re-sintered Song Jun official porcelain process is low in yield, complex in sintering process, too bright in color, too straight in color, opacifying effect is not obvious and the like can be overcome; and the purpose that the re-sintered Song Jun official porcelains have the glaze colors of powdery cyan, celeste, azure, grayish blue and the like of series of Song Jun official porcelains can be achieved by controlling the color of a glaze layer by controlling and adjusting the parameters of the mass ratio of the nano ferric oxide in the basic glaze, the firing temperature and the like. In addition, a nano material has the characteristics of being high in diffusion ability in Jun porcelain glaze firing, and beneficial to uniform distribution of a coloring agent in a Jun porcelain glaze layer, so that a sintered Jun porcelain product is uniform in color, the viscosity of the glaze layer in the glaze firing process can be effectively reduced, the defects of air holes and the like on the surface of the glaze porcelain are avoided, and the firing success rate of the Jun porcelain is increased.

The invention discloses a two-piece type hard sealing floating ball valve, and relates to a clamp, the two-piece type hard sealing floating ball valve comprises a valve body, a valve cover, a ball body and a valve rod, the valve body and the valve cover are both obtained through a forging process, the valve cover is arranged on one side of the valve body, and the valve body and the valve cover are connected through a connecting bolt set; a cylindrical limiting block is arranged on one side of the valve cover, a first valve seat is embedded in the cylindrical limiting block, and a mounting space, a second cylindrical space and a second medium channel are sequentially formed in the valve body; the cylindrical limiting block is inserted into the mounting space and is sealed through a sealing device, a second valve seat is arranged in the second cylindrical space, and a multi-sealing assembly is arranged between the second valve seat and the second cylindrical space; the ball body is arranged between the first valve seat and the second valve seat, the top of the ball body is connected with a valve rod, and the top of the valve rod penetrates through the valve body and then is connected with a sealing driving device; medium leakage can be effectively prevented, and the sealing performance of equipment can be effectively improved.

The invention relates to a manufacturing process of a composite insulator, which uses an injection molding mold, the injection molding mold includes a base frame, a mounting frame, an upper mold, a lower mold, a lifting cylinder and a vibration mechanism, and the above-mentioned injection molding mold is used to make a composite insulator. The specific process flow of the type insulator is as follows: mandrel forming, mandrel grinding, injection assembly, ejection and demoulding, and shape trimming. The upper mold includes the main body of the upper mold, the upper shaping block and the upper driven gear. The lower mold includes the main body of the lower mold, Lower shaping block, lower driven gear, telescopic cylinder and fixed ring. The invention can drive the rubber material to shake within a certain range during the injection process, ensure the uniform distribution of the rubber material in the mold, avoid defects such as air holes caused by uneven distribution of the rubber material, and can drive the mold through the vibration mechanism to carry out the injection process during demoulding. Vibration achieves the purpose of accelerating the separation speed of the mold and the silicone rubber shed.

The invention relates to a carbon fiber / high tenacity epoxy composite material grid fillet molding method, and belongs to the technical field of grid ribbing structure composite material molding. The cross section of a grid fillet prepared with the molding method is large, the common depth-to-width ratio is 1-3, the depth ranges from 15 mm to 20 mm, and the carbon fiber / high tenacity epoxy composite material grid fillet molding method In particular, the invention relates to a T800 carbon fiber / epoxy hot melting method prepreg grid fillet skin class structure molding method. The carbon fiber / high tenacity epoxy hot melting pre-soaking silk material system which is low in flue containing amount and high in filter size content is adopted in the method, large-section size fillet molding technical researches are developed, adaptation improvements are carried out on the pre-soaking silk paving process, the glue absorbing curving process, the skin interface interlayer bonding process and the like are achieved, and application to grid fillet standard structure pieces is achieved.

The invention relates to the processing field of iron castings, in particular to a technique for producing large and medium-sized cylindrical iron castings through a clay green sand molding. The technique achieves the application of the clay green sand molding process in the production and processing of the large and medium-sized iron castings, and is achieved through the following technical steps: molding sand preparation, modeling, core making, mold assembling, teeming, shakeout, cleaning, inspection and repair. The core making comprises the steps as follows: 1, designing a sand core structure, wherein the sand core is designed to be provided with a through hole structure or a blind hole structure in an axial direction, so that a cavity type structure is formed; 2, drawing drawings of an internal mold and an external mold; 3, adopting a steel plate to produce the internal mold and the external mold, wherein a plurality of exhaust through holes are formed uniformly in the internal mold; and 4, producing the cavity sand core. The technique provided by the invention is reasonable, simple, and convenient to implement; moreover, the implementation meets the requirements for energy conservation and emission reduction, the production cost can be saved effectively, the production technology process can be shortened, the production efficiency can be improved, and the economic benefits of enterprises can be increased; and the technique is mainly used for producing iron castings provided with the cylindrical characteristic such as middle-segment, bottom-segment castings and the like of a carbon disulfide gasification reacting furnace.

The invention belongs to the technology of metal surface treatment and particularly relates to an improved method for laser cladding of a hard alloy coating on a crown of a turbine blade. Laser three-dimensional forming equipment is adopted for carrying out laser cladding on the hard alloy coating. The method comprises the following steps: cleaning the blade; clamping the blade; vacuum-drying the hard alloy powder; and carrying out laser cladding. The invention provides an improved method for laser cladding of the hard alloy coating on the crown of the turbine blade, so that the steps are simplified, the operating time is shortened and the cladding efficiency is improved. Meanwhile, the defect of pores generated in the cladding process and the like is avoided, and the quality of the hard alloy coating is improved.