A kind of titanium and titanium alloy casting and forming method thereof
A molding method and technology for titanium alloys, applied in the field of titanium and titanium alloy casting and casting molding, can solve the problems of complex core preparation process, difficult core cleaning, poor dimensional accuracy, etc., so as to avoid cracking and deformation problems and improve poor finish , the effect of good dimensional accuracy
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Embodiment 1
[0033] Such as figure 1 The titanium alloy impeller casting shown has an outline size of φ480*200mm. The casting is a semi-closed structure with a narrow and long inner cavity, and the minimum internal gap is only 5mm. Due to the narrow and long inner cavity of the casting, it is extremely difficult to adopt investment casting or graphite casting, and even cannot be formed. Using the ceramic core method, the molding of the ceramic core is difficult, the cost is high, and subsequent cleaning is difficult. This problem can be well solved by adopting the forming method of the present invention, and the specific implementation steps are as follows:
[0034] 1. Preparation of large thin-walled precision sand cores
[0035] ⑴Preparation of sand core blank
[0036] The raw materials for preparing the sand core (10% of bauxite sand of 8 mesh to 12 mesh, 10% of bauxite sand of 16 mesh to 80 mesh, 2% of silicate strengthening agent, 15% of silica sol, and the balance of 150 mesh to 2...
Embodiment 2
[0058] A forming method of a titanium alloy impeller casting, the specific implementation steps are as follows:
[0059] 1. Preparation of large thin-walled precision sand cores
[0060] ⑴Preparation of sand core blank
[0061] The raw materials for preparing the sand core (12% of bauxite sand of 8 mesh to 12 mesh, 15% of bauxite sand of 16 mesh to 80 mesh, 4% of silicate strengthening agent, 17% of silica sol, and the balance of 150 mesh to 200 mesh Purpose bauxite powder) after mixing evenly, fill the inner cavity of the sand core mold and tamp it evenly. After the molding is completed, take out the original sand core blank, place the original sand core blank in the sand box equipped with refractory powder, and Complete landfill, the thickness of the landfill powder is 10mm~30mm;
[0062] ⑵Put the sand core and the sand box together in a low-temperature oven for baking, the baking temperature is 180°C, keep warm for 2 hours, then raise the temperature to 350°C, keep warm f...
Embodiment 3
[0083] A forming method of a titanium alloy impeller casting, the specific implementation steps are as follows:
[0084] 1. Preparation of large thin-walled precision sand cores
[0085] ⑴Preparation of sand core blank
[0086] The raw materials for preparing the sand core (15% of bauxite sand of 8 mesh to 12 mesh, 20% of bauxite sand of 16 mesh to 80 mesh, 8% of silicate strengthening agent, 20% of silica sol, and the balance of 150 mesh to 200 mesh Purpose bauxite powder) after mixing evenly, fill the inner cavity of the sand core mold and tamp it evenly. After the molding is completed, take out the original sand core blank, place the original sand core blank in the sand box equipped with refractory powder, and Complete landfill, the thickness of the landfill powder is 30mm;
[0087] ⑵Put the sand core and the sand box together in a low-temperature oven for baking, the baking temperature is 200°C, keep warm for 3 hours, then raise the temperature to 450°C, keep warm for 3 ...
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Abstract
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