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597 results about "Investment casting" patented technology

Investment casting is an industrial process based on lost-wax casting, one of the oldest known metal-forming techniques. The term "lost-wax casting" can also refer to modern investment casting processes.

Wax injection mold for investment casting of hollow turbine blades and method for rapidly manufacturing wax injection mold

The invention discloses a wax injection mold for investment casting of hollow turbine blades and a method for rapidly and accurately manufacturing the wax injection mold. The mold consists of a cavity mold, a mold core and an accessory structure, wherein the cavity mold comprises an upper mold and a lower mold of a combined structure; each mold block forming the cavity mold consists of an external aluminum mold frame, an internal cast zinc alloy inlay and a conformal cooling copper pipe embedded into the inlay; a mold core positioning piece which can be decomposed at a high temperature is arranged on a longitudinal rib of the mold core; and water-soluble core blocks used for forming exhaust openings in the rear edges of the turbine blades are arranged on rear edge ribs of the mold core. The matching precision of the mold core positioning piece and the cavity mold is guaranteed by adopting a cavity mold interior running-in method, and the matching precision of the water-soluble core blocks and the cavity mold is guaranteed by adopting a cavity mold interior adhesion method. The wax injection mold disclosed by the invention is low in manufacturing cost and short in period, and the high wax pattern precision and core positioning precision can be obtained.

Method of construction for density screening outer transport walls

InactiveUS6033564AThin and inexpensiveReduced toleranceRotary centrifugesCeramic shaping apparatusBursting strengthDynamic balance
A method for combining three different means of constructing the concentric layers of the outer collecting wall for industrial size centrifuges, whereby treating the inward-facing elements of easily cast or stamped materials using processes such as Physical Vapor Deposition, Chemical Vapor Deposition or metal plating, transforms them into an innermost member with superior hardness and durability, and whereby said wear surface member or deposited layer is physically supported by a middle composite layer made up of one or more investment castings designed to optimally transfer centrifugally-induced compression loads from the innermost wear surface toward the outer surface of the composite wall, such castings being of ceramic, metals or other materials, and whereby the outer surface of said composite wall is comprised of a filament-wound hoop strength reinforcement layer, using aramid, graphic, carbon or such fibers mixed and embedded in resin, such that all highly desirable characteristics for a centrifuge outer, heavies-collecting wall are provided, including interior hardness and wear abrasion, incompressibility and intrinsic dynamic balance, and substantially higher hoop or bursting strength, than can be attained through any metal-crafted centrifuge outer wall, and, model for model, for substantially lower design and fabrication costs.

Aluminum-based dot matrix material based on 3D printing technology and preparation method thereof

The invention discloses an aluminum-based dot matrix material based on 3D printing technology. In the dot matrix material, industrial pure aluminum or any aluminum alloy is employed as a base body. Unit cell configuration and a periodic structure thereof are modeled and designed with CATIA software and the model is produced from high-molecular materials through the 3D printing technology. An investment casting shell mould is prepared from soluble gypsum and the aluminum-based dot matrix material is prepared through an air-pressure seepage process. The aluminum-based dot matrix material can be in a pyramid type, a Kagome type and a grating type in the unit cell configuration. The invention also provides a sandwiched plate composite structure composed of the dot matrix material and a compact surface plate. The diameter of a unit cell bar is 0.5-5.0 mm, the length of the unit cell bar is 0.5-15.0 mm, and an included angle between the unit cell bar and a protective surface is 30-70 degrees. The compact surface plate is made from industrial pure aluminum, aluminum alloy, iron alloy or high-molecular materials. The dot matrix material with the industrial pure aluminum as the base body can reach higher than 5 MPa/g*cm<-3> in specific compressive strength.

Partial cooling method of cold iron in investment casting

InactiveCN103192027AAvoid enteringEnhance local heat transferFoundry mouldsFoundry coresWaxInvestment casting
The invention provides a partial cooling technology of cold iron in investment casting. The partial cooling technology comprises the following steps of: 1, manufacturing a wax model by a general investment casting process; 2, designing the cold iron and a wax block which has the same shape and dimension as the cold iron, according to the shape of the outer surface of a hot spot of a casting, and then manufacturing the cold iron and the wax block, wherein the inner surfaces of the designed cold iron and the wax block are clung to the outer surface of the hot spot of the casting in shape, and the cold iron and the wax block are provided with positioning platforms; 3, fixing the wax block to a part requiring partial chilling on the wax model, and tightly clinging to the surface of the wax model; 4 manufacturing a housing at the surface of the wax model, and exposing part of the positioning platform of the wax block from a model housing; 5, dewaxing the model housing; 6, roasting the model housing at high temperature; 7, fixing the cold ion in an opening of the model housing, and positioning through the positioning platform; and 8, casting after preheating the model housing, wherein the partial chilling effect is realized in the cold iron. By carrying out the steps mentioned above, the heat exchange at the hot spot of the casting can be improved, the chilling effect can be realized, and as a result, the purpose of reducing the defect of dispersed shrinkage of a shrinkage cavity in the casting can be realized.
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