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...
Turn the knob to 250mm. Adjustment of scanning speed: align the longitudinal wave straight head with the 40mm large flat bottom of austenitic stainless steel Ⅱ W2 test block at the ratio of 1:4 time adjustment baseline, and adjust the instrument so that the first and...
The chemical composition inspection methods of impeller castings include chemical analysis and spectral analysis. Chemical analysis has high precision and can be used as an arbitration method, but the analysis speed is slow. Although the analytical accuracy of spectral analysis method is slightly lower than that of chemical analysis...
In order to improve the mechanical properties of zg1cr18ni9ti stainless steel impeller investment casting sand casting, reduce segregation and improve corrosion resistance. Solid solution treatment (as cast) → stabilization heat treatment process was selected in the experimental process. 75kW air electric furnace is selected for heating. 1. Solution treatment...
a. Gas cutting process parameters The gas cutting equipment of impeller investment casting sand casting pouring and riser adopts g01-300 cutting torch gas cutting (No. 4 annular cutting nozzle), oxygen cylinder and acetylene cylinder. See table for process parameters. Amplitude H / mm Swing frequency / (times / min)...
Due to the low plasticity and work hardening of investment casting sand casting stainless steel impeller, it is difficult to cut stainless steel by common cutting technology. At present, the common cutting methods of stainless steel include plasma arc cutting and oxyacetylene flame vibration gas cutting. Although plasma arc...
Because it is a composite mold of molten model shell and sodium silicate sand mold, the sand dropping process of impeller investment casting sand casting is divided into two stages, namely, the cleaning of sodium silicate sand in sand casting and the alkali boiling cleaning of molten model shell....