Spontaneous combustion phenomenon appears in thermosetting casting material

The internal temperature of large castings rises sharply during curing to the point of spontaneous combustion. This problem directly affects the mechanical properties and surface quality of the product, and in severe cases leads to scrapping of the entire batch.

(1) Process factor: Exothermic accumulation in thick-walled large-volume casting triggers thermal runaway, This factor affects the '2079851475616104453 and final quality of the product. (2) Temperature parameter aspect: Reaching the auto-ignition temperature of the material, Temperature deviation directly affects the physicochemical state of the material and the reaction progress. (3) Formulation aspect: Insufficient curing agent or catalyst dosage, with the ratio deviating from stoichiometry. (4) Process aspect: Curing temperature or time is insufficient, and the reaction conversion rate does not meet requirements. (5) Environmental aspect: Ambient temperature too low or moisture interferes with the curing reaction.

(1) Implementation measure: It is strictly forbidden to cast exothermic systems in a single large volume, Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (2) Implementation measure: Adopt layered casting, Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (3) Implementation measure: Install temperature monitoring and alarm devices., Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish sound process control standards and a quality inspection system, and regularly review process data for continuous optimization.

The core of the poor curing problem is that the chemical reaction conditions do not meet the requirements; it is necessary to precisely control the formulation ratio and curing process parameters.