Preparation method for foam model used for lost foam casting based on 3D printing

Abstract

The invention discloses a preparation method for a foam model used for lost foam casting based on 3D printing. The method comprises the following steps: subjecting foam particles to steam pressure-maintained foaming so as to allow a foam particle raw material with bulk density of 500 to 600 g / L to become foamed foam particles with bulk density of 17 to 25 g / L through foaming; then filling the raw material box of a 3D printer with foam particles obtained through air blast cooling at 20 to 30 DEG C for printing; allowing every layer of foam particles sprayed on a heating model workbench to be fused and bonded under the action of heating temperature of the heating model workbench, wherein layers of foam particles are accumulated one by one and mutually bonded until a complete foam model is obtained; and completing printing with the 3D printer so as to obtain the foam model used for lost foam casting. The method provided by the invention has the advantages of small die loss, a short manufacturing period, low production cost and easy manufacturing.

Description

technical field [0001] The invention relates to a method for preparing a foam model for lost foam casting based on 3D printing. Background technique [0002] Lost foam casting (also known as solid casting) is made of foam plastic (EPS, STMMA or EPMMA) polymer material to form a solid model with exactly the same structure and size as the part to be cast, after dipping refractory coating (strengthening , bright and clean, air-permeable) and dried, buried in dry quartz sand and subjected to three-dimensional vibration modeling, pouring molten metal into the casting mold sand box under negative pressure, so that the polymer material model is heated and gasified and drawn out, and then is cast Liquid metal replaces the one-time molding casting new technology formed after cooling and solidification to produce a new casting method for castings. [0003] The foam plastic model used in this lost foam casting method is traditionally used to pre-expand the purchased foam plastic parti...

AI Technical Summary

Problems solved by technology

This traditional method will use different molds to produce different parts. Therefore, the amount of molds is large, and it is difficult to open the mold. Multiple mold openings and cutting in the production process will cause a large amount of loss of the mold, and the production cost is high; and Later mold maintenance and repairs also require a lot of manpower and material resources. In addition, the design and production of molds will take a long time, which will delay the delivery date or lead to timely delivery; secondly, this traditional injection molding Molding method, because high-temperature steam needs to be passed into the mold, it has high requirements on the structure and material properties of the mold itself, making it difficult to manufacture