Scanning method for keeping uniform temperature of electron beam cold bed furnace rectangular crystallizer

Abstract

The invention discloses a scanning method for keeping the uniform temperature of an electron beam cold bed furnace rectangular crystallizer. The scanning method includes the following steps that the size of the crystallizer is confirmed, the crystallizer is divided into five equal parts in the length direction, and equal dividing marks convenient to observe are arranged on the outer side of the crystallizer, the crystallizer is installed on a dummy ingot system to be leveled and well fixed, after normal work of a water cooling system, a dummy ingot system and a vacuum system is confirmed, an electron beam responsible for scanning the crystallizer is arranged for scanning a pattern, virtual thermal imaging is conducted on the set patterns, thermal uniformity of the scanned pattern is confirmed, and smelting can be conducted after vacuum reaches a preset value. The scanning method is simple in design, convenient to operate, good in using effect, capable of effectively overcoming the defects such as layer folding, cold isolating, scabbing, waisting and hole shrinking on the surface of a rectangular slab, and capable of effectively improving the quality of the surface of the slab, reducing the face milling amount and improving the one-time yield.

Description

technical field [0001] The invention relates to a scanning method for maintaining uniform temperature of a rectangular crystallizer of an electron beam cooling bed furnace, and belongs to the technical field of engineering. Background technique [0002] Titanium alloys are widely used because of their low density, high specific strength, high temperature resistance, corrosion resistance, good mechanical properties and process properties. However, titanium alloy ingots smelted by traditional methods often have problems such as excessive grain size, composition segregation, holes, cracks, high-density inclusions and low-density inclusions, and the appearance of these defects will cause subsequent parts to appear during use. Fatigue, in order to improve its service life, it is necessary to produce high-quality and clean titanium alloy materials. [0003] Electron beam cold bed furnace smelting technology is a metallurgical technology that combines electron beam and cooling bed...

AI Technical Summary

Problems solved by technology

Due to the different internal water flow rates at both ends and both sides of the rectangular crystallizer, and the different contact areas between the two ends and the middle part and the titanium liquid during the casting process, the titanium liquid in the mold is prone to produce a large temperature difference. If the electronic scanning process of the scanning mold is unreasonable, it is easy to cause the liquid level on the casting side of the mold (in contact with the casting lip) to be higher than the liquid level of the entire mold, and this part is prone to cracks (side cracks). Defects such as folds and cold shuts are prone to defects on the opposite side of the casting. There is a temperature transition zone in the middle and end of the crystallizer. This area is prone to defects such as scarring and open tearing. The appearance of these defects will Reduce the surface quality of the ingot, increase the amount of milling, greatly reduce the first-time yield of the ingot, and bring difficulties to subsequent processing

[0005] Through the search of the prior art literature, no relevant reports have been found on a scanning method for maintaining uniform temperature of the rectangular crystallizer of the electron beam cooling bed furnace

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