Mix gypsum and water in a ratio of 100:45, stir thoroughly until all bubbles in the gypsum slurry are exhausted, and coat the surface of the impeller mold with gypsum slurry, as shown in Figure 1 (a). Pay attention to the fact that the blades should also be filled...
1. Design of pouring system scheme Based on the design principles of component structure and investment casting gating system, three gating system schemes were designed for the impeller gating system, namely one top gating type, one side gating type, and one bottom gating type, as shown in Figure 1....
Investment casting is a special type of casting in the field of casting and molding, usually used to make precision and complex parts, and has played an important role in fields such as aviation and industrial gas turbines. The process of investment casting is completed by several steps. Firstly,...
ZHK400 vacuum consumable electrode arc shelling furnace is used for melting. The consumable electrode uses the secondary ingot bar produced by the vacuum consumable arc furnace. Arcing current/A Preheating current/A Warm-up time/s Melting current/A Melting voltage/V Melting vacuum degree/Pa Melting time/min 1000-1500 3000-5000 60-80 28000-36000 34-41 3.0-5.0 8 1000-1500...
The impeller in question is made of ZTC4 titanium alloy, and its chemical composition should meet the requirements of Cast Titanium and Titanium Alloys (GB/T 15073-2014). Samples should be taken from the parts where the impeller has cracks and casting defects to detect its chemical composition. See the table...
The material grade of titanium alloy fan impeller produced by a factory is ZTC4, with a diameter of 1.3m. It is an interference fit with the shaft assembly. During operation, the speed is 2867r/min, and the speed regulation is 1000~2900r/min. The medium is converter gas from the steel plant,...
The core pulling molding sand casting technology commonly used in the production of cast impeller and the assembly and welding technology commonly used in the preparation of complex investment mold divide the large and complex cast impeller into two parts: complex blade and simple hub and spoke. For the...
According to the technical requirements, the mechanical properties test mainly includes hardness and tensile properties. 1. Hardness test After solution treatment, the hardness of the cast impeller blade and rim was measured by hb-3000 Brinell hardness tester; The diameter of the indenter is 5mm and the load is 750KG....
a) Metallographic observation of casting state Etchant: aqua regia solution Magnification: 100X The as cast structure of zg1crl8ni9ti is shown in Figure 1. Structure description: there are ferrite distributed in dendrite on the austenitic matrix, forming austenite + ferrite + granular carbide. After 18-8 stainless steel is cooled slowly...
Adjustment of scanning speed: when adjusting the baseline with 1:1, the method is the same as above. Turn the knob to 50mm gear. The ultrasonic flaw detection of spokes is also based on Φ 2mm is the sensitivity. Sensitivity adjustment method: also take the spoke bottom...