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Akhmedova Shakhnoza Asadjanovna, postgraduate student, the Machine-building faculty Tashkent State Technical University, E-mail: sh.akhmedova@yahoo.com Sabirova Dildora Ubaydullayevna, dotsent, the Machine-building faculty Tashkent state Technical University Head of Department, E-mail: sabirovadildora@gmail.com
CASTING ON COMBUSTIBLE AND LOST WAX CASTING 3D MODELS IN SHELL SHAPES WITH THE USE OF AUTO CAD PROGRAMS
Abstract: The article deals with the application of traditional and additive technologies in the production of machine parts. And also possibilities of introduction and use of AutoCAD programs inproduction of foundry business. Presents the article: the traditional technology of manufacturing parts by casting; of additive technology for manufacturing parts of machines using a 3D printer; Classification of technological processes using a 3D printer. The description of the presented of traditional and additive technologies in the manufacture of machine parts using a 3D printer is given. The advantages of applying additive technologies in the production of machine parts are shown.
Keywords: high technology, additive technologies, extrusion, laser technologies, gasification models, investment casting.
In modern conditions, in the era of the Internet and electronicthe widely introduction of modern information and communication technologies has the great priority determined very high (high tech) levels of additive technology and attention to this technology in all countries of the world. It gives unlimited opportunities to obtain the most complex products, in all industries and even at home.
Earlier it was supposed to carry out practical experiments for production of the cast preparation for any concrete detail of mashines and mechanisms.
Special-to-date information. To find information
- on 3D scanning and printing devices,
- on systems of automatic design and control of 3D printers.
- accessto materials for products.
- Personally to make a complex product with the help of additive technology.
The application of traditional and additive technologies in the production of machine parts is considered below [1]. Presented: the scheme of traditional technologies of manufacturing parts by casting; of formation for the traditional technology of manufacturing parts by casting; scheme additive technology of manufacturing parts ofmachines using 3D-printer; classification of technological processes using 3D-printer. The description of the presented schemes of traditional and additive technologies in the production of machine parts using a 3D printer. Advantages of application of additive technologies in production of details of cars are shown.
Traditional texnologi: Development DetailsDesigner, Logistics Operations-Technologist,
Section 4. Technical science
Development of Technology of foundry and pattern Tooling- Designer Technologist, Manufacturer of pattern equipment (the master model, pattern, core box) workers of different specialties plots wood -and metal - processing: turners, millers, mechanics, etc.- all the workers ofhigh qualification, obtaining cast billets, elements snap -smelting and casting of metal melt, moulding-de-coring, cleaning-sweep, etc.- all high-skill workers, testing and control.
Additive Technology: development details- designer, development of 3d drawings of casting or moulding tooling or form - Designer, development of 3d drawings of casting or moulding tooling or form - Designer, 3d printing, casting, synthesis of model or form -Designer, testing and control.
For fast production-production offinished parts from materials supported by 3D-printers. This is an effective solution for small-scale production in the manufacture of models and molds for foundry production.
The use of two technologies: production of castings "by melted models" and "by burnt models" is due to the fact that the synthesis model on a 3D printer is completely identical. on the 3D printer is completely identical and differs only by the model material and extruder setting.
Earlier it was supposed to carry out practical experiments for production of the cast preparation for any concrete detail of cars and mechanisms.
In the future, it was decided to apply the process of obtaining a shell shape with the introduction of a thin glass fiber into the gypsum. That is, get the shell out of plaster with inserted into it a small amount, approximately less than 0.1%, glass fiber in the form of fragments with a length of 3-6 mm. It is in our opinion was to play the role of reinforcing rebar to prevent cracking of the plaster shell.
In the future, it was decided to apply the process of obtaining a shell shape with the introduction of a thin glass fiber into the gypsum. That is, get the shell out of plaster with inserted into it a small amount, approximately less than 0.1% by weight, fiberglass in
the form of fragments with a length of 5-10 mm. It is in our opinion was to play the role of reinforcing rebar to prevent cracking of the plaster shell.
For the experiment was made 200 ml creamy aqueous solution of gypsum, to which was added chopped short NAPof fiber glass wool. The length of the cut fibers was approximately 5-10 mm Fiber was cut with scissors from a few irregular lump of glass so part of the cut pile may differ from the specified size higher or lower, i. e., more than 10 and less than 5 mm. This experiment had the character of production and the number of fibers and length of the detailed experiments were not carried out. To do this, it is necessary to conduct a wider experiment with the study of the influence of the length and percentage ratio of fibers to the amount of gypsum solution, the influence of the consistency of gypsum and other process parameters. It is expected that this will be the next stage of scientific work on the doctoral dissertation.
Gypsum-fiber composition was made with the introduction of dry powder gypsum (150 g) of cut glass (100 ml free poured), water (50-70 ml) to the formation of creamy consistency, constantly stirred with metal spatula. Within, approximately, 1 min.
The model was lowered into a liquid plaster composition, enveloping the model with a layer of solution 3-5 sec. Then removed the model from the solution, turned in space, allowing to form a uniform layer and the draining of excess solution for about 60 seconds. During this time, the plaster composition on the model hardened somewhat. Gypsum composition was intensively mixed at this time to reduce the rate of hardening. At this stage limited to the shell in two layers.
After 30 minutes of holding the shell with the model was placed in to a muffle furnace with a heating temperature of400 degrees for 2 hours. After extraction of the shell form it was stated that the model completely burned down. Then the shell was placed in a flask and filled with dry sand. A small vibration compacted sand, from which left the caster shell system and immediately poured the form of with lead.
In half an hour flooded the form is removed and the shell was destroyed. It is seen that the thickness of the double layer was equal to 4-6 mm. The fibers in plaster compositions has prevented the cracking of the shape during annealing.
Thus, the time for AUTOCAD design 3D synthesis model was 2-4 hours of printing models on a 3D printer to 2 hours, were completely eliminated many traditional operations.
The conducted experiment has shown that the production of complex castings on the combustion (gasified) model prepared on a 3D printer with a form of fiber-gypsum composition is a very effective highly technological process of obtaining castings. The process can be recommended for more fundamental research and practical production usage.
Such industries as metallurgy and machine building continue to develop actively, so the implementation and use of the AutoCad program in these industries is necessary.
Carries out a complete cycle from design to production of molds and components of various complexity, both in sketches, drawings, 3D models of the customer and on the finished product, as well as provides a full range of services for servicing these products. We are ready to develop: photos, ideas, drawings in the formats SolidWorks and AutoCad, samples, 3D models. The design of molds provides for all the customer's wishes up to the small details of the work of the future prod-
uct. Sophisticated complexsolutions from product design, simulation of molds, matrices, dies, their manufacture, to testing and commissioning are taken into account [2].
Manufacturing of molds is a complex, high-tech process that requires great responsibility and professionalism from the manufacturer. The basis for the mold is high-quality steel, which passes through various processing stages. During operation, the mold will be exposed to pressure and temperature, therefore the steel from which the mold is made must be of high quality and resistant to different kinds of influences. Thedesignofthemoldshouldbeimmacu-latelyaccurate.
At this time, the task is extremely urgent in the rapid and error-free design of the tooling. The specialists of our company have the necessary knowledge and extensive experience in the design of metal products to order, and the development of design documentation is done using modern computer-aided design tools. These aspects reduce the number of errors at the design stage of the product and reduce the time the tool is put into production.
The price for the manufacture of molds, matrix, stamps, is set depending on the complexity of the product, the materials from which it is produced, the required size, volume, production time. Individual approach to each new task, allows you to optimize the costs and time for product manufacturing, thereby reducing costs
References:
1. GOST 19505-86. Moulding patterns and core boxes plastic. Specifications.- Instead of GOST 1950574; Vved.- 1987-06-E0.- Moscow: Publishing house of standards,- 1986.- 10 p.
2. Volnov I. N. Systems of automated modeling of foundry processes-status, problems, prospects // Foundry worker of Russia. - 2007.- No. 6.- P. 14-17 p.
