98 results about "Lost-wax casting" patented technology

The invention discloses a precision lost wax casting technology based on selective laser powder sintering 3D printing. The precision lost wax casting technology comprises the following steps that S101, a target part is subjected to optimal design of a CAD casting technology; S102, selective laser powder sintering 3D printing forming is carried out; and S103, silica sol/water glass precision investment casting is carried out. A wax mold of the part can be fast manufactured without molds, the metal part is fast manufactured, fast manufacturing of complex parts can be achieved, and integration, automation and fastness in the precision casting technology process can be achieved; and the development period of new products are greatly shortened, development cost is reduced, and the precision lost wax casting technology is especially suitable for production of single small-batch complex castings and trial-manufacturing of new products.

[Problems]To provide a lost-wax cast impeller for a supercharger having no parting line corresponding part on a hub surface and a blade surface in each space demarcated by pairs of long blades adjacent to each other and having excellent aerodynamic performance. [Means for Solving Problems]This method of manufacturing the impeller comprises a step for forming a lost form pattern formed in the substantially same shape as the impeller for the supercharger, a step for forming a mold by eliminating and removing the lost form pattern after the lost form pattern is coated with a refractory, and a step for pouring a molten metal in the mold for casting. In the step for molding the lost form pattern, a lost material is injection-molded in a space demarcated by radially arranging, toward a center shaft, a plurality of slide molds having short blade-shaped bottomed groove parts and space shapes between the pairs of long blades adjacent to each other, and the slide molds are released by moving in the radial direction of the center shaft while rotating. Thus, the parting line corresponding part is not present on any of the hub surface and the blade surface in the spaces demarcated by the pairs of long blades adjacent to each other.

A process and apparatus for casting three-dimensional parts and sacrificial models from a class of casting compounds which incorporate one or more radiation activated photo initiators which cause polymerization of the casting compound causing it to solidify or transition from a solid in a first state to a solid more suitable for use as a sacrificial model in a lost wax casting process. The class of casting compounds include, 1) compounds which act as conduits for the polymerization initiating radiation during and/or after hardening and 2) compounds which are hardened by a radiation induced chain reaction throughout the body of fluid casting compound. These compounds allow the part being cast to be cured within transparent molds that are supported by transparent mold frames. The apparatus consists of a radiation source positioned to irradiate the casting compound within a mold cavity through the mold frame and mold wall to effect the polymerization, solidifying, process. Separation of the molded part from the mold is enabled by the relative flexibility between the part and mold cavity walls. This is a function of using a soft, flexible material for the mold body and/or a polymerization process which caused the casting compound the solidify into a soft, flexible object. When the polymerized cast part is at least partially removed from the mold, it may be subjected to additional radiation of a frequency different form that initially applied the cause the solid cast part to transition to a hard or ridged part having properties more suitable for a model which is to be used as a sacrificial model in a lost wax process. An automated casting system is anticipated which is enabled by the use of very soft, stretchable and deformable material for the mold body and supporting the mold with radiation transparent mold frames. Oxygen and other gases in the atmosphere react with some casting compounds to create a sticky film on mold cavity walls which causes difficulty when removing a casting from a mold. This problem is eliminated by purging the mold cavity with an inert gas between casts.

The invention discloses a multipolymer base powder material used for SLS and a preparation method thereof. The multipolymer is a styrene-acrylonitrile (SAN) multipolymer. The preparation method comprises the following steps that: firstly, an SAN resin is subjected to deep cooling and crushing; secondly, the multipolymer powder with appropriate grain diameter and appropriate distribution of the grain diameter is selected by the sieve method; and finally, a certain proportion of the multipolymer powder, carbon soot and a flow aid are mixed evenly to produce the multipolymer base powder material. Because the SAN is an amorphous polymer, the vitrification temperature is low and the die shrinkage is small; therefore, the multipolymer base powder material has good sintering performance and high drip molding accuracy. Meanwhile, the SAN has appropriate melt viscosity and body intensity; therefore, the SLS die molding of the multipolymer base powder material also has high intensity. The multipolymer base powder material can be used to manufacture a wax pattern used for lost wax casting and a functional element meeting general requirements through SLS forming and appropriate post treatment.

The present invention relates to a ceramic core used in the manufacture, by lost wax casting, of a turbomachine blade with cooling cavities and a squealer, comprising at least one main core, wherein the main core (10) comprises an element (10B) shaped so as to constitute the squealer and an element (10SB) shaped so as to constitute at least one cavity beneath the squealer, the two elements leaving between them a space (13) shaped so as to constitute, at least in part, the bottom wall of the squealer. In particular, the elements (10B and 10SB) are joined together by ceramic rods (TG).

A method and system for creating an article of jewelry that contains an anatomical image using a digital image of an anatomical body part such as a fingerprint, handprint, footprint, or the like to create a computer numeric controlled (CNC) software program that drives a machine for producing a wax model of the anatomical image. The wax model is used in a lost wax casting process to create a casting that is used in an article of jewelry. The present invention further provides an article of jewelry containing a novel bail assembly for attaching the article of jewelry to a chain or the like in an aesthetically pleasing manner that hides the attachment hole of the casting.

The invention discloses a CAD/CAM digital manufacturing method for bracket movable denture. The method comprises the follow steps: 1) preparing data: scanning a tooth working model to obtain A data required for CAD design; 2) CAD design: CAD design bracket structure B, Form the A+ data needed to design the teeth and the base, CAD design the tooth structure C and the base shape, form the A++ data needed to design the base formwork, CAD design the base formwork structure D; 3) CAM production: extraction bracket Structure B, tooth structure C, base mold shell structure D three kinds of data for CAM typesetting, CAM cutting and then lost wax casting to obtain the support structure B, CAM cutting to obtain the tooth structure C, 3D printing to obtain the base mold shell structure D; Injection molding; 5) Grinding and polishing: The stent-type movable denture of the invention has simple preparation, high precision and short production cycle, reduces production cost and improves the quality of the movable denture restoration.

A ceramic core used for fabricating a hollow turbine blade for a turbine engine by using the lost-wax casting technique and shaped to constitute the cavities of the blade as a single element, includes, in order to feed the insides of these cavities jointly with cooling air, core portions that are to form first and second lateral cavities and that are connected to a core portion that is to form at least one central cavity, firstly in the core root via at least two ceramic junctions, and secondly at various heights up the core via a plurality of other ceramic junctions of positioning that defines the thickness of the internal partitions of the blade, while also ensuring additional cooling air for predetermined critical zones of the first and second lateral cavities.

A method of forming a gating fixture for a lost wax casting process includes determining an optimal orientation of a gate in relation to a part, and forming a fixture that can repeatably be used to consistently locate the gate relative to the part. In one example, stereolithography is used to form the fixture.

The invention discloses a precise low-pressure lost wax casting system, which comprises a heat holding furnace positioned in a low-pressure casting machine. A riser tube is inserted in the heat holding furnace. The top of the riser tube extends out of the heat holding furnace and is positioned in a center hole of a working table of the low-pressure casting machine. A hoisting steel plate is fixed on the working table of the low-pressure casting machine. A modeling steel plate is fixed on the hoisting steel plate. A sand box is fixed on the modeling steel plate. A pressing steel plate covers the top end of the sand box. A pressing device is pressed on the pressing steel plate. A combined shell is arranged in the center of the inner cavity of the sand box, is coaxial to the riser tube, and comprises a thin-wall product shell, an inner gate shell, a cross gate shell and a sprue cup shell, which are sequentially arranged from top to bottom in a penetrating manner. The lower end opening of the sprue cup shell is formed in the center hole of the modeling steel plate and is in butt joint with the upper end opening of the riser tube hermetically. The periphery of the combined shell and the inner space of the thin-wall product shell are filled with dry sand. The system has the advantages that a thin-wall product can be molded at high temperature, the cost is low, the efficiency is high, and defects are few.

The present invention relates to a method of producing cooling fluid discharge orifices in the wall (171) of a part manufactured by the technique of lost wax casting in which a pattern of the part is produced in a wax mold, the orifices having a first portion (110E) emerging at the external surface (171_ext) of the wall. The method consists in making cavities in the wax pattern that correspond to the first portions (110E) of said orifices of the part.

Thus it is possible to produce cooling air discharge orifices without sharp edges.

The invention provides a craft manufacturing flow for lost-wax casting a value body with a more than 8-inch caliber, aiming to solve the craft difficult problems that a wax form is heavy, is difficult to turn, is easy to be damaged by cracking and shedding and the like. The invention adopts reinforcing ribs to enhance the strength of the value body and enlarge a welding contact area of a running gate system. The invention has simple manufacturing, high finished product ratio, good quality and the like; the product has smooth and beautiful appearance, stable size and small morpheme error; and shooting shows that the inner part of the product has no crack and shrinkage porosity phenomena, thus reaching the over second-level RT requirement.

The invention discloses a lost-wax casting technology for a thin-wall pressure-bearing casting. The lost-wax casting technology comprises the following steps of according to technology design requirements, placing patches on an inner cavity of an air cylinder casting from bottom to top by employing a hot spot incircle rolling method, changing an iso-wall thickness structure of the air cylinder casting into a structure which is gradually thickened from bottom to top, thus being in favor of forming progressive solidification, designing two risers at the thickest part of an upper part patch of the air cylinder casting, making the risers perform feeding on the thickest part, placing a riser neck at a hot spot position of the air cylinder casting, determining the risers and a gate stick according to the size of the riser neck, and then, manufacturing a mold according to the technology requirement; molding: opening the mold, checking whether a mold cavity is intact or clean or not, sprayinga mold releasing agent to a position comparatively tiny and complicated in shape in the mold cavity, then, injecting wax into the mold cavity by utilizing a wax injector, after wax injection is finished, opening the mold after a wax piece is cooled, and taking out a wax mold. The lost-wax casting technology disclosed by the invention is capable of increasing quality of the casting and reducing casting defects.

In the casting of a single crystal component, such as a turbine blade, by the lost wax casting technique, one or more ceramic pieces are positioned on a wax pattern at locations corresponding to parts of the cast component where relatively quick solidification of molten metal may occur during casting. A coating is subsequently formed around the wax pattern to define a mould, whereupon the wax is removed to leave the one or more ceramic pieces within the formed mould.

The invention relates to a dental 3D printing wax material based on MJP (multi-jet printing) technology. The dental 3D printing wax material is prepared from the following raw materials in parts by mass: 20-50 parts of microcrystalline wax, 10-30 parts of montan wax, 10-30 parts of vegetable wax, 5-15 parts of Fischer-Tropsch wax and 5-20 parts of a toughening agent. The dental 3D printing wax material based on the MJP technology has the characteristic of balanced rigidity and toughness, high precision, moderate kinematic viscosity and good film forming performance; plugging, limpness and ashresidues in lost wax casting cannot occur when the dental 3D printing wax material is applied to the MJP technology, the requirements of high printing speed and high precision of the MJP technology are met, and lost wax performance in casting is good. Besides, the dental 3D printing wax material based on the MJP technology can meet the requirement of 3D printing dentistry for high precision.

The invention discloses a technological process of a Lost-wax casting waste shell total regeneration utilization new process. The new technological process of the invention comprises the following steps: waste shell collection -roll-polishing and impurity removal-de-ironing by magnetic force -refining and crushing-laying screening - measurement and package, the technological process produces regeneration sand particles by adopting a mechanical matching coordinated process. The invention is energy-saving and environment-protective, thereby bringing good overall economic efficiency.

A percussion instrument made from Chunyu (an ancient musical instrument) belongs to the technical field of musical instruments. The percussion instrument consists of a plurality of Chunyu instruments, a mallet, a hook, a sling and a bracket and is characterized in that each Chunyu instrument has the same shape and material but is different in height, diameter and the thickness of supporting wall. Each Chunyu instrument is arranged into 1-4 layered structure capable of being used for music performance according to the respective height and the mode, scale of produced sound and each layer of the Chunyu instrument is hung on the bracket by the hook and the sling. Each Chunyu instrument is respectively cast from bronze by adopting a lost wax casting process and accords with the note arrangement from pitch to bass according to produced sound. One scale is remained among every Chunyu instrument, so an executant can fix the tone independently and can play music of different scores by using the mallet to beat different Chunyu instruments. The percussion instrument not only remains the advantages of resonant sound, exaggerated performance and generous shape of an ancient Chunyu instrument, but also richens the variety of percussion instruments and can be used as a main or auxiliary musical instrument.

The invention discloses a double-row sprocket wheel which is used as a component for transmission movement and comprises a sprocket wheel body, wheel teeth and a shaft hole. The finished product of the sprocket wheel is obtained by steps that: the product is basically formed by No. 45 steel by the lost-wax casting; the left end part of the shaft hole is cut and processed into the hole that is matched with a bearing; then tooth surface is quenched to obtain the finished product. The technology adopted by the lost-wax casting and the parameters are as follows: a. a formwork needs to be cured at 800 DEG C to 850 DEG C and is cooled to the temperature of 600 DEG C to 650 DEG C naturally so as to carry out casting; b. iron melt is heated to the temperature of 1650 DEG C to 1680 DEG C and expanded perlite powder is added for covering the iron melt; after 2 to 3 minutes, scum in a furnace is removed by a mechanical way; then appropriate amount of SiC is added for deoxidation, after that the casting is carried out; c. only one sprue runner is provided. The double-row sprocket wheel uses the lost-wax casting to replace the manufacturing method of using roughcast round steel for cutting and processing, thus greatly reducing the cutting capacity and reducing the product cost; meanwhile, the technological parameters of the sprocket wheel are reasonable and the qualification rate is high, therefore, the quality of the manufactured product can fully accord with the actual use requirements.

The invention discloses a cold mold casting method of rubber. The cold mold casting method is a novel technique which is completely different from the conventional casting technique. The casting cost of the cold mold casting method is reduced by 35-50% when being compared with that of lost wax casting and lost foam casting, so that cast parts of which the cost is equivalent to that of ordinary sand casting and the quality can completely meet the requirements of precise casting can be produced through cold mold casting. Metals which can be applied to cold mold casting at present are gray cast iron, spheroidal graphite cast iron, cast steel, aluminum alloy, copper alloy and the like.

A dewaxing casting technology using contact layer for preparing the multi-layer ceramic shell mould including a mother mould made of wax or its similar material and at least one contact layer includes such steps as dipping said mother mould in a modeling paint containing ceramic particles and adhesive to form a contact layer, depositing black particles on said contact layer, and drying.

The invention discloses a method for bonding chillers in a lost wax casting process. The method includes the steps: 2) determining hot spot regions on castings according to casting drawings, determining bonding positions of the chillers, and calculate the area of the hot spot regions; 2) preparing cast steel bars, determining the sizes of the chillers according to the area of the hot spot regionsacquired in the step 1), machining the cast steel bars into the chillers meeting size requirements by the aid of a sawing machine, machining more chillers with the same specification sizes by the aidof chiller molds, and preparing the chillers meeting requirements by an investment casting mode; 3) preparing installed and welded wax molds, cleaning the outer surfaces of the chillers and the regions on the wax molds for bonding the chillers, removing sand grains and oil stain, and ensuring bonding firmness of the chillers. According to the method, the inner quality and the machining requirements of the castings can be ensured, and production cost is reduced.