Bagaimana cara mengontrol suhu untuk memastikan kekerasan yang seragam?

Achieving accurate and reliable temperature control in the tempering furnace is essential to guaranteeing uniform hardness of H13 material. To guaranty a furnace temperature differential of ≤±5°C, this calls for a PID temperature control system, multi-point temperature measurement verification, and consistent furnace loading. 1. Crucial Temperature Management Techniques Control Object Particular Practice Function PID System for Temperature Control Set the temperature to 580°C with a PID adjustment function in a tempering furnace. automatically adjusts temperature variations to avoid lag or overshoot. Verification of Multi-point Temperature Measurements Set up at least three temperature reading stations in the furnace's upper, middle, lower, and corners. To prevent "local overheating" or "cold zones," make sure the real temperature differential is ≤±5°C. Check for Furnace Body Sealing To stop heat loss, maintain the heating components and furnace door seals on a regular basis. Reduce variations and preserve temperature stability System of Forced Convection To improve the consistent flow of hot air, turn on the nitrogen circulation system or the furnace fan. Remove dead zones and increase the thick and thin portions' heating uniformity Practical Case: By switching to a PID furnace with multi-point temperature measurement, Jingmo Technology was able to minimize the hardness differential of the H13 manifold after tempering from 2.8 HRC to 1.2 HRC. 2. Assurance of the Supporting Process Standardized Furnace Loading: To enhance heat conduction, utilize high-temperature resistant fixtures, eliminate stacking, and keep a minimum of 5 cm between workpieces; Conduct Two Tempering Cycles: To avoid stress rebound, the workpieces must air cool to room temperature following the first tempering; Adequate Holding Time: ≥2 hours every time, plus 30 minutes for each 25 mm of thickness in the case of thicker parts; Maintain Furnace Temperature Curves: To guaranty process traceability, keep thorough heating and cooling data for every furnace. Advice: Select a service provider (like Wuhan Heat Treatment Plant) that supports CQI-9 certification because their temperature control requirements are stricter and consistency is more assured. 3. Temperature Runaway Risk Alert Unusual Situation Potential Repercussions Recommendations for Reactions Temperature differential in the furnace > ±10°C Soft spots or hard areas emerge when the hardness range surpasses the standard (>2 HRC). Hentikan tungku segera untuk kalibrasi, lalu lakukan pengukuran distribusi medan suhu lagi. Menyetel suhu terlalu rendah (<550°C) High brittleness, hardness > 52 HRC, and inadequate tempering. Re-temper; direct use is not allowed at all. Excessive heat (>600 derajat ) mengurangi kekuatan,-temper berlebihan, dan kekerasan di bawah 48 HRC. Tentukan apakah perbaikan dan-quenching ulang diperlukan.