美国GCA真空工业公司生产的“wo-rk horse”牌FGQ型真空炉,是一种对工具钢进行热处理的新型真空热处理炉。炉子的最高工作温度是1320℃,有效热区的尺寸范围有从300 × 300 × 300mm到 300 × 300× 900 mm等不同型号。为了加速对处理工件的冷却,该炉采用外部回路的气冷循环装置 The “wo-rk horse” brand FGQ vacuum furnace manufactured by GCA Vacuum Industries of the United States is a new type of vacuum heat treatment furnace for heat treatment of tool steel. The maximum operating temperature of the furnace is 1320 ℃, the effective hot zone size range from 300 × 300 × 300mm to 300 × 300 × 900 mm and other different models. In order to speed up the cooling of the workpiece, the furnace uses an air-cooled circulation device of the external circuit