1 Scope 1.1. This procedure applies to all die casting molds in the die casting workshop. 1.2. This procedure is applicable to the matters that should be observed during the use, maintenance and maintenance of die-casting molds. 2. Reference Standards: Valid versions of the following documents form part of this procedure: GB/T5611-1998 casting terminology GB8844-88 die casting mold technical conditions GB8847-88 Pressure Casting Mold Terminology GB4678.1～15-84 Die-casting parts GB4679-84 Die casting parts technical conditions 3. Use of die casting mold Die-casting molds are costly to manufacture, precise and complex in design, and must be used in accordance with the correct procedures. 3.1 preheating 3.1.1 Before the die casting production, the mold must be preheated. Preheating method: If the mold temperature machine is used, it must be preheated by the mold temperature machine; if it is not equipped, it can be preheated by using the external electric heating mold heating plate. Preheating temperature is 230~280 °C. 3.1.2. When using the mold temperature machine to preheat, firstly, the clamping force should be loosened to prevent the mold from expanding after preheating, so that the clamping mode is too tight. 3.1.3. After the mold is preheated, the locking degree of the mold must be re-adjusted. 3.2 Mode temperature control in production: The die-casting mold that can use the mold temperature machine must be used. It does not have the die-casting mold that uses the mold temperature machine. It can adjust the production rhythm to control the mold temperature by spraying the paint. (Mold temperature control and preheating temperature) 3.3 Pouring temperature control: The pouring temperature has a great influence on the life of the mold, and the pouring temperature must be controlled strictly according to the temperature requirements in the process card. The selection of the pouring temperature in the trial production stage of the mold can be referred to the "General Process Specification for Die Casting". 3.4. During the production process, pay attention to the surface of the mold at any time, and find that the dirt is cleaned in time and the lubrication of the sliding part is made. 4. Maintenance of die casting mold: 4.1, the basis for repairing the model: A. Mold design drawings B. Mold size inspection results C. Sample out-of-tolerance D. Operator's reflection The mold repairer performs repairs according to the mold repair order issued by the craftsman. 4.2. Repair of the cavity part: The cavity part can be repaired and replaced according to the damage, but the repaired mold must be restored to the original size, shape and roughness, and verified by the test. 4.3. Repair of non-cavity parts The repair of the non-cavity part shall be repaired, replaced, etc. according to the damage, but in principle, the original structure, roughness and hardness shall not be changed. 4.4. Inspection of the mold after repair: 4.4.1. After the repair is completed, the mold shall be inspected by the technician according to the drawings and repair orders. 4.4.2. Test molds that require test mode inspection may be arranged for test mode inspection. 4.4.3. If the qualified mold is signed and approved by the craftsman, it shall be put into storage or arranged for production, and the repair order shall be filed at the same time. 5. Maintenance of die casting mold: 5.1. After the die-casting mold is qualified, a file must be established, including the date of qualification, the manufacturing unit, the use record, the repair record, and the maintenance record. 5.2. Each time the mold is used, the use list should be filled in, and the production situation should be accurately recorded. If the fault occurs, the production should be stopped immediately, and the technician should be notified to formulate the repair plan. 5.3. The finished mold is used for inspection, cleaning, and oil sealing. 5.4, ​​periodic stress relief annealing Since the stress accumulated during the use of the mold can reach a considerable amount, sometimes exceeding the strength limit of the mold, leading to an early crack accident, the mold must be periodically subjected to stress relief annealing to improve the life of the mold. The periodic stress relief annealing cycle of various types of molds: The mold below 500 tons, the new mold is put into production 5000 times for the first time to stress, and the above work is repeated for every 10,000 to 15,000 molds. More than 500 tons of molds, the new mold is put into production 5000 molds for the first time to stress, after each production of 6000 to 1000 molds to repeat the above work. 5.5, timely grinding and repair Since the cracks of the turtle are generated on the surface of the mold, the expansion rate is extremely low in the stage from the crack source to the microcrack. At this time, it is ground in time to prolong the life of the mold. The mold repairer pays attention to the stress concentration of the gate, the runner, the corner, the sharp edge, the fillet and the circumference of the hole. It is found that the microcrack must be ground in time. 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