3D printing sand mold exhaust structure and exhaust method

Abstract

The invention provides a 3D printing sand mold exhaust structure and exhaust method. The exhaust structure comprises at least one group of exhaust channel trees; each group of exhaust channel trees comprises an air guide main path (1) and a plurality of air guide branches (2); the air guide branches (2) are arranged on a sand mold parting surface (3); one end of each air guide branch (2) is communicated with the air guide main path (1) in the group of exhaust channel trees; and the other end of each air guide branch (2) is communicated with a forming cavity (4); the air guide main path (1) penetrates through a sand mold; and one end or two ends of the air guide main path (1) are communicated with the outside and are not communicated with the forming cavity (4). According to the 3D printingsand mold exhaust structure and exhaust method, the small-aperture air guide branches communicated with the forming cavity are prepared on the parting surface of the sand mold, and the large-apertureair guide main path not communicated with the forming cavity is designed to gather gas and discharge the gas out of the sand mold, so that the problems of large air evolution amount and poor air permeability of the sand mold can be effectively solved on the premise of ensuring that the sand mold does not leak fire, and the exhaust structure is simple in structural design and convenient to apply and popularize.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing sand mold exhaust structure and an exhaust method. Background technique [0002] In recent years, sand mold 3D printing technology has been rapidly applied in the field of casting processing, and has become an important technology for casting to shorten the development cycle and reduce development costs. Compared with the traditional sand mold preparation process, the most important feature of sand mold 3D printing is a digital moldless casting technology. Compared with ordinary resin sand molds, due to the different preparation process adopted, 3D printing sand molds have a larger air volume and poor air permeability. In addition, the core fit accuracy is better, and the core exhaust becomes a control casting. focus on quality. [0003] In the traditional molding core making method, the problem of core exhaust can be solved by directly piercing th...

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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the inventors have carried out dedicated research and provided a simple and effective 3D printing sand mold exhaust structure and exhaust method. On the premise that the sand mold does not run out of fire, it solves the The core has a large gas volume and poor air permeability

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