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The present invention discloses a method of using cold extrusion technology processing punch cavity of a roller, which roller press ram extrusion molding punch is sized and positioned a sleeve… (More)
The utility model is a bearing cage mold testing device. The socket depth gauge for low-noise ball-bearing cage mold consists of two parts: Measuring reference part and measuring device. Its… (More)
The invention provides a method for measuring the total iron content in directly-reduced iron. The method comprises the following steps of: adding potassium fluoride solution and mixed acid of… (More)
The invention provides a method for determining total silicon content in a silicon carbide refractory material. Before determination, the silicon carbide refractory material sample is fired at the… (More)