Shell preparation method for investment casting
An investment casting and investment technology, which is applied in the field of high dimensional accuracy and complex structure investment casting shell preparation, can solve the problem of failure to consider the setting method of the metal core, the thermal oxidation of the filler and the coating, and the inner cavity of the shell. Surface quality influence and other problems, to reduce the risk of investment deformation and local cracking, shorten the demolding time, and facilitate the later demoulding effect.
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Embodiment 1
[0070] A method for preparing a mold shell for titanium alloy case investment casting, wherein the casing casting has a three-ring structure, and the rings are connected by support plates with different wall thicknesses and shapes. The support plates are cavity structures and the number is 8 , symmetrically distributed. The outer ring has a frame structure with the same height as the outer ring and is directly connected to the outer ring. There are special-shaped bosses on the curved surface of the inner ring. The casting size is 1000mm in diameter and 320mm in height. The preparation of titanium alloy casing casting mainly includes the following steps:
[0071] (1) Determination of reinforcing rods. According to the structural strength calculation results and computer simulation simulation results, the selection of reinforcing rods and the determination of placement positions mainly include the following steps:
[0072] Step (1.1), in the state of computer simulation, carry ...
Embodiment 2
[0087] The invention discloses a method for preparing a shell for a frame-type superalloy investment casting. The casting is a frame-beam structure with a length of 350 mm, a width of 270 mm, and a height of 600 mm. The casting has four sides and a bottom. The side is composed of frame beams crossing, and the four sides are asymmetrical structures. There are mounting seats, flanges and bosses in some places. The bottom surface is flat, and there are mounting edges and bosses in some places. The preparation of the side casting shell mainly includes the following steps:
[0088] (1) Determination of reinforcing rods. According to the structural strength calculation results and computer simulation simulation results, the selection of reinforcing rods and the determination of placement positions mainly include the following steps:
[0089] Step (1.1), in the state of computer simulation, carry out the gating system design of the superalloy frame-shaped casting, complete the combi...
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