Purpose. Creation of an environmentally, sanitary and hygienically safe technology for structuring sand-liquid glass mixtures, ensuring the rapid production of high-quality casting molds and cores with a given level of technological and physical-mechanical properties.
Specifications. The use of technology using the PMZ process makes it possible, using currently existing microwave ovens with a magnetron power of 700…900 W, to produce foundry molds, their individual elements, rods weighing up to 4 kg and dimensions 200 x 200 x 200 mm within 3…20 minutes. with a compressive strength of up to 3.5 MPa, a gas permeability of at least 100 units, a gas content of 3…8 cm3/h, which are suitable for use immediately after their removal from the equipment for the manufacture of castings from steel, cast iron, bronze, alloys based on aluminum things like that. In addition, using the PMZ process it is possible to produce volumetrically closed casting molds using frozen models from sand-water mixtures, to fasten casting half-molds from sand-rare glass mixtures together, to use mixtures as heat-insulating materials that form castings and elements of gating systems of castings.
Application area. Foundry.
Advantages. The main advantages of the proposed technology are manufacturability and environmental friendliness of the production process, stability and predictability of the expected result, safety of manufacturing molds, cores, castings, high production standards, availability and low cost of the materials used, ease of disposal and regeneration of the waste mixture.
Technical and economic effect. Additional net profit is achieved by reducing the cost of knocking out castings from molds and cores from castings, refusing to use imported synthetic resins in production, using domestic non-scarce inexpensive materials of large-scale production in the technology, and high-tech mixtures. An additional social effect is a sharp increase in sanitary and hygienic conditions and the culture of casting production, a decrease in environmental and air pollution, and the almost complete disappearance of the need to dispose of the waste mixture by using it as a raw material for the production of silicate blocks or as a filler for various construction concrete products. , in particular, paving slabs, etc.
Description. An innovative, scientifically based technology for structuring sand-rare glass mixtures using microwave radiation for the manufacture of foundry molds and cores (PMZ process) has been developed, the mass and conglomeration composition of the mixtures has been optimized, rational parameters for the technology of their structuring, and patterns of formation of the main ones have been established. The conditions for storing raw materials, the use and cladding of sand, the removal of cores from castings, the use of variations of the process and its elements in foundries in the manufacture of small castings for general engineering purposes are determined.