144results about How to "Reduce shrinkage" patented technology

The invention provides a casting method of a turbine housing. The casting method includes the following steps of firstly, core manufacturing, secondly, core assembly, thirdly, shell core baking, fourthly, smelting and refining, fifthly, mold preparation, sixthly, casting and seventhly cutting and cleaning. In the core manufacturing process, a riser sand core mold is arranged on a core shooting machine, the core shooting machine is powered on to heat the mold, a layer of precoated sand is cured on a cavity of the riser sand core mold, and a riser sand core is obtained after mold opening. In the core assembly process, the riser sand core and a turbine housing core are assembled and bonded. In the shell core baking process, shell cores painted with coatings are put into a baking kiln. In the smelting and refining process, raw materials are added to a melting and heat preservation furnace, and the melting and heat preservation furnace is powered on for melting. In the casting process, the shell cores are put in a mold, and tilt casting is conducted after mold combination. In the cutting and cleaning process, a casting is cut, the riser is cast, and burrs and fins of the casting are ground and cleaned. The metal tilt casting method of an aluminum alloy turbine housing body can solves the problems of shrinkage porosities and cavities and slag holes in a big flange face of the aluminum alloy turbine housing; open risers and blind risers are arranged, in combination with the riser sand core, an ideal temperature field is formed after the casting is cast, and solidification can be conducted from the casting to the risers in sequence.

The invention discloses a single-component, high-solid-content and low-volatility organic compound (VOC) and environment-friendly type varnish composition. The varnish composition comprises at least one polymer with a hyper-branched or tree-shaped structure, at least one hydroxyl acrylic resin or hydroxyl methacrylic resin, at least one cross-linking curing agent, at least one acid catalyst, at least one rheology control agent and at least one auxiliary agent. With the adoption of the varnish composition and application of the varnish composition, disclosed by the invention, the viscosity of a varnish coating system can be effectively reduced, and the solid content of the construction can be easily improved to be 58 percent or above; construction VOC emission is reduced to be smaller than or equal to 420g/L; varnish film shrinkage caused in a curing process can also be effectively reduced and a cured multi-coating varnish film has better appearance effect; particularly, the effect in a wet-on-wet process, a three-coating and one-drying process of curing three coatings together or an IPP system of primers, paints and varnishes is obvious.

The invention relates to a manufacturing method of removable dentures. Currently, the removable-denture manufacturing methods in all countries in the world are a thermos-coagulation packing method, need steps such as casing, filling, squeezer pressurizing and water bath polymerization (dental cast cooking pot), are complex in process, time-consuming and labor consuming, are non-uniform in moldingcase pressurizing and are difficult in precise mastering and control of heating speed and heating maintaining time during heat processing. The method has the advantages that the manufacturing flow oftraditional removable dentures is improved, joint height increasing and contraction bubbles of the removable dentures manufactured by the traditional manufacturing process are avoided, and the base-material filling of the partial removable dentures and attachment dentures can be performed; the models of the attachment dentures does not need to be pressurized on a squeezer, and the subfissure or deformation of the fixing-part porcelain teeth of the attachment dentures is avoided.

The invention relates to a ceramic metal composite substrate and a production method thereof. The substrate mainly comprises an ultrathin ceramic sheet, a heat conduction glue and a metal substrate; the ceramic powder of the ultrathin ceramic sheet is a micropowder and a nanopowder mixture, and the volume proportion of nanopowder in the ceramic powder is 15-25%; and the heat conduction glue comprises, by volume, 20-30% of a one-dimensional high heat conduction material. The production method mainly comprises the following steps: making the ultrathin ceramic sheet; carrying out surface treatment on the metal substrate, coating the metal substrate with the heat conduction glue through a coating technology, and carrying out drying semi-solidification; and carrying out hot pressing on the ultrathin ceramic sheet and the glued metal substrate. The ceramic metal composite substrate has a good heat conduction performance, and has a good heat matching performance with chips, and the method has a high production efficiency, and is in favor of realizing development of the substrate to a small, light and thin direction. Tape casting makes the production efficiency of the ultrathin ceramic sheet be high; and the heat conduction glue comprises the one-dimensional high heat conduction material, so thermal resistance between the ultrathin ceramic sheet and the metal substrate is reduced.

The invention discloses a total alkaloid of Stephania delavayi Diels, the content of which is measured by tetrahydropalmatine. Tetrahydropalmatine occupies 55-95 percent of the total alkaloid extract of Stephania delavayi Diels, wherein the weight percentage of tetrahydropalmatine contained is no less than 2 percent, while the weight percentage of palmatine hydrochloride contained is no less than 0.8 percent. The invention also discloses a preparation method of the total alkaloid of Stephania delavayi Diels, which relates to the steps as follows: adding the Stephania delavayi Diels meal into ethanol for diacolation or reflux to acquire alcohol extract, decompressing and recycling the ethanol and concentrating into a condensed ointment for dissolving and filtrating with acid to acquire a filtrate, passing the filtrate through a macroporous resin column or a strong acid cation exchange resin column for adsorption, washing with water to remove the impurities and extracting with a eluent, collecting the eluent and decompressing and recycling the extract and then concentrating and drying, thus acquiring the total alkaloid of Stephania delavayi Diels; the steps can also be decompressing a percolating liquid to recycle the ethanol, concentrating, dissolving with acid and then filtrating, adjusting the pH value of the filtrate with weak base to produce deposition, filtrating the deposition to acquire a filter residue, adding ethanol into the filter residue to resolve and decompress, recycle the ethanol and then drying, thus acquiring the total alkaloid. The results of a pharmacological study on the acquired total alkaloid show that the total alkaloid of Stephania delavayi Diels has good effect on spasmolysis, pain relieving, antiphlogosis and antibiosis, blood activating and so on, and can combine with the acceptable components in pharmacy to prepare various sustained release or controlled release formulation or other formulations.

The invention discloses a preparation method of bombax ceiba three-dimensional dried flowers. The preparation method comprises following steps: (1), pretreatment, wherein fresh bombax ceiba flowers are immersed in a color retention agent so as to maintain original color and quality of bombax ceiba flowers in subsequent drying processes, and the color retention agent is a mixture of citric acid and glycerin; (2) embedding, wherein gaps of the bombax ceiba flowers processed via step (1) are filled with degreasing cotton, the whole bombax ceiba flowers are coated with degreasing cotton, and the obtained bombax ceiba flowers are coated with granular silica gel; (3) drying, wherein vacuum freeze drying or refrigerator freeze drying are used to dry the coated bombax ceiba flowers so as to remove water in the bombax ceiba flowers; and (4), the granular silica gel and the degreasing cotton are removed so as to obtain the bombax ceiba three-dimensional dried flowers. The preparation method is used for preparing the bombax ceiba three-dimensional dried flowers; original shape, color, texture, softness, and straight shape of the bombax ceiba flowers are basically maintained; the bombax ceiba three-dimensional dried flowers can be further made into bombax ceiba three-dimensional dried flower souvenirs in forms of single flower, flowering branch, or other forms; and supply of the bombax ceiba flowers all year round becomes possible.

The invention provides a ceramic tile combining blank patterns with penetration ink patterns. The ceramic tile comprises a bottom blank layer and a surface blank layer. The surface blank layer is 1-5 mm thick. The bottom blank layer and the surface blank layer are integrally stamped to form a tile blank body. Patterns of the surface blank layer are composed of blank colorful pattern areas with different colors and printed pattern areas printed through penetration ink jointly. The blank colorful pattern areas are composed of one or more of colorful bulk particles or ceramic powder materials with ordinary particle sizes or fine powder materials with ordinary particle sizes prepared through ceramic powder materials. The printed pattern areas are shown on the ceramic powder materials and/or the fine powder materials with ordinary particle sizes. The effect that random blank patterns are obtained through blank colorful materials with various dark colors or clear and sharp edges and grains is achieved, and the random blank patterns are combined with the more vivid and exquisite colorful patterns which are obtained through digital printing through the penetration ink to form the ceramic tile with full-page patterns.

The invention discloses a sol-gel preparation method of barium titanate PTC ceramics, which comprises the following steps that: (1) the materials are measured according to the formula (Ba1-xYx)TiO3, and x is equal to 6 to 20 permillage, barium acetate water solution with the concentration of 1.3 to 1.6 mol/L is prepared, and tetrabutyl titanate solution with the concentration of 1.0 to 1.3 mol/L is prepared; (2) Y(NO3)3.6H2O is incorporated into the Ba(CH3COO)2 water solution, and then the mixed solution is dropped into the Ti(OC4H9)4 solution to obtain the mixed solution; (3) the mixed solution is held at the room temperature to obtain the sol, and the sol is dried to obtain the gel; (4) the gel is smashed, ground and sieved to be pre-burned to synthesize the BaTiO3 powder containing yttrium; (5) the BaTiO3 powder containing the yttrium, the BaCO3 and the BN are measured according to the mol ratio of 1: (0.02 to 0.03) : (0.04 to 0.06) and are mixed and ball milled after being added with deionized water; (6) the BaTiO3 powder containing glass-phase raw material is ball milled with solvent and dispersant, and then the obtained mixture is ball milled with bond and plasticizer to obtain sizing agent for curtain containing; (7) the sizing agent is formed in a curtain coating way; and (8) and flakes are sliced and sintered to obtain the ceramic piece. The prepared PTC ceramic has the advantages of small crystal grains, small room-temperature resistivity and large PTC effect.

The invention provides skin spermatogonium protection liquid and a preparation method thereof. The protection liquid is mainly formed by dissolving aminoglycoside antibiotics in DMEM (Dulbecco's modified eagle medium) culture medium water solution, 80-120U of the aminoglycoside antibiotics are dissolved in every mL of the DMEM culture medium water solution, and the concentration of the DMEM culture medium water solution is 13-25mg/mL. The skin spermatogonial stem cell protection liquid sufficiently simulates a human internal environment and is more suitable for survival of skin stem cells and spermatogonial stem cells and stable in property, the survival rate of the skin stem cells and the spermatogonial stem cells can be remarkably improved, and cultivation of the skin stem cells and the spermatogonial stem cells can be further enlarged while the skin stem cells and the spermatogonial stem cells are preserved.

The invention relates to the technical field of circuit board production, in particular to a method for an electroplating copper taphole in a PCB. The method comprises the steps of forming a first metalized blind hole from a first surface of a multi-layer working panel, forming a second metalized bind hole from a second surface, making the bottom of the first metalized blind hole connect with the bottom of the second metalized blind hole in a butt-joint mode so that an existing porefilling electroplating production line can be used to conduct via-filling-plating on the first metalized blind hole and the second metalized bind hole and finally forming the copper taphole tamped by electroplating copper. The advantages that roasting is not needed by the electroplating copper taphole and a stuffing material coincides with a hole wall metal are used to solve the problem that a porthole sunken depth is larger than 3 micrometers caused by roasting in the prior art; meanwhile, due to the fact that copper is used as the stuffing material and expansion coefficient of the stuffing material coincides with that of a hole wall copper layer can sharply lower risks of stratified plate blasting in a welding process. The number of plate grinding times in a production process can be lowered by using the electroplating copper to tamp metalized through holes, thus expansion-shrinkage degree of the multi-layer working panel can be lowered; meanwhile, the method is beneficial to improvement of the quality of the product.

The invention discloses a method for improving the wide section tundish changing success rate of a plate blank. The method comprises the following steps that when the tonnage of an old tundish is reduced to a preset low tonnage, a new tundish is started to be checked; after pouring of the previous furnace of steel is finished, the old tundish is separated a tundish area, and before the new tundish is opened to the pouring position, the liquid level of a crystallizer is kept at the high liquid level; when the old tundish is separated from the tundish area and before the new tundish is opened to the pouring position, a U-shaped supporting piece is placed into the crystallizer; and when the new tundish is opened to the position close to the centering position of the crystallizer, a new tundish vehicle is controlled to rotate to walk at a low speed, and when the new tundish rotates to the pouring position, the tundish falls to be poured. According to the technical scheme, by controlling the tundish changing process, the tundish changing time is shortened, the blank shell shrinkage degree is reduced, and the wide section tundish changing success rate of a slab casting machine is improved.

The provides a pulse control method and a device thereof, ablation equipment, a system and a storage medium. The pulse control method comprises the following steps: outputting a nanosecond pulse sequence and a millisecond pulse sequence to a target biological tissue; the amplitude of the nanosecond pulse sequence is larger than the threshold voltage, and the amplitude of the millisecond pulse sequence is smaller than the threshold voltage. According to the embodiment of the invention, the nanosecond pulse sequence with the amplitude greater than the threshold voltage cooperates with the millisecond pulse sequence with the amplitude less than the threshold voltage, such as the synergistic effect of the high-voltage nanosecond pulse sequence and the low-voltage millisecond pulse sequence, so that the effective ablation range can be enlarged, the ablation is more thorough, the muscle contraction amplitude can be effectively reduced, or the muscle contraction probability is reduced, even the muscle contraction phenomenon is avoided, the treatment experience feeling of a patient can be improved, and the use of anesthetics can be reduced or even not needed, so that the treatment cost is effectively reduced, and side effects are reduced.

The invention provides an edge anticorrosive electrophoretic coating composition, coating and application. The edge anticorrosive electrophoretic coating composition comprises component A: 15 to 35 parts of at least one organic amine modified epoxy resin; 5 to 20 partof at least one blocked isocyanate; 1 to 10 parts of at least one film-forming auxiliary; 1 to 5 parts of at least one phosphate-modified cationic microgel; 1 to 10 parts of at least one first organic acid; 0.5 to 5 parts of at least one auxiliary solvent; and 30 parts of deionized water; and component B: 10 to 25 parts of at least one epoxy resin containing quaternary ammonium salt and/or tertiary sulfonium salt group; 5-40 parts of at least one pigment; 5 to 40 parts of at least one filler; 0.5 to 5 parts of at least one dispersing aid; 30 to 70 parts of second deionized water. By adopting the invention, the coverage of the electrophoretic coating on the edge of a workpiece can be greatly improved, and the edge corrosionresistance can be improved.