Tire mold low-pressure casting method capable of eliminating deformation of patterned ring

Abstract

The invention discloses a tire mold low-pressure casting method capable of eliminating deformation of a patterned ring, which comprises: joining gypsum molds to form a nonstandard round gypsum mold, and positioning the nonstandard round gypsum mold on a lower metal mold of a coasting mold cavity; processing upper and lower horizontal positioning grooves on the external circumference of the gypsum mold; forming the coasting cavity by using the gypsum mold serving as a core mold and upper and lower metal molds, and obtaining an aluminum alloy tire mold casting after molten aluminum is solidified; dividing a tire mold into single patterned block castings; positioning the patterned block castings by a planar positioning reference and a cylindrical positioning reference and machining to obtain standard patterned blocks; and joining the standard patterned blocks by a process device to obtain an entire tire mold. The patterned blocks produced by the method retain the characteristics of uniform chemical ingredients, consistent metallic structure and uniform coefficient of thermal expansion of ring coasting. The gravity block coating mature machining process adopted in a later period greatly improves the overall quality of the mold and obviously reduces cost.

Description

technical field [0001] The invention relates to a tire mold low-pressure casting method for eliminating pattern ring deformation in the field of aluminum alloy tire mold low-pressure casting. Background technique [0002] At present, there are four production methods of aluminum alloy tire molds, machine tool engraving, electric discharge machining, low pressure full circle casting and gravity block casting. The engraving accuracy of the machine tool is high, but it is powerless for slightly complicated patterns. There are a large number of sharp corners in the pattern of tire molds, and circular tools cannot be processed. In addition, the steel sheet inlay on the mold is very difficult. Although EDM can partially solve the problem of sharp corners, it is also helpless for complex patterns, because the electrodes are consumed too quickly and the accuracy will soon be lost. EDM belongs to three-coordinate machining. For patterns that must be processed by five-coordinates, o...

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Problems solved by technology

Because the pouring process is carried out in a natural environment, it is easy to contain gas in the liquid aluminum during pouring, so defects such as pore inclusions are prone to occur. The gravity casting is carried out in a single block, which leads to a long casting time. The pattern block cast first and the last The chemical composition of a pattern block will have a large deviation, and it is difficult to maintain the same cooling conditions for each mold, which leads to differences in the internal structure of each pattern block, which affects the precision maintenance time and service life of the mold

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