自由锻件余热淬火

⑴ 稳定可控的加热体系。坯料的加热体系为中频感到加热、红外测温仪和三通道温度分选体系，可利便的掌握加热温度和分选加热温度分歧格的坯料。

⑵ 确定合适的淬火温度，并能有用加以掌握。合适的铸造余热淬火温度需凭据实验确定，现实操纵中可通过掌握铸造加热温度、锻后停顿时间来实现，锻后停顿时间推荐碳钢不大于60s、合金钢在20～60s之间。

配置红外测温仪和温度分选体系，将低于淬火温度的锻件分选出去;当铸造加热温度稳定、铸造历程也稳定时可配置工序时间测量和报警体系，通过掌握工序时间到达掌握淬火温度的目标。

⑶ 良好的淬火体系。在包管淬火结果的条件下选定冷却才气较慢的淬火剂，以防备紧张淬火变形和开裂。因为铸造余热淬火温度比一般淬火温度高，是以锻件淬透性好，故碳钢和合金钢一般选用油或PAG淬火剂。

淬火槽应有足够的容积，冷却时间可控，另外还要配置淬火介质轮回、冷却体系和加热装配，淬火介质温度自动掌握，还应配置抽风装配。增强对淬火介质的保护，定期检验淬火介质的冷却性能，清理液槽及轮回体系中的氧化皮等杂质，保持淬火介质的洁净。

⑷ 淬火后的回火和回火炉的配置位置。锻件淬火后其里面存在较大应力，造成放置历程中产生较大变形乃至开裂。为防备淬火后零件变形和开裂，淬火后锻件应实时回火。锻件淬火后可弃捐时间与锻件质料、形状和环境温度相关，需凭据实验确定。为勤俭动力和进步回火炉的行使率，降低保温能耗，接纳余热淬火的锻件一般在热处分车间密集回火。

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Free forging quenching

(1) Stable and controllable heating system. The heating system of the billet is a medium frequency sensing heating, an infrared thermometer and a three-channel temperature sorting system, which can conveniently grasp the billet of the heating temperature and the sorting heating temperature.

(2) Determine the appropriate quenching temperature and be useful to grasp. The suitable quenching temperature of casting residual heat should be determined by experiment. In reality, the casting heating temperature and the dwell time after forging can be realized. The post-forging pause time is recommended to be no more than 60s for carbon steel and 20 to 60s for alloy steel.

The infrared thermometer and the temperature sorting system are arranged to sort out the forgings below the quenching temperature; when the casting heating temperature is stable and the casting process is stable, the process time measurement and alarm system can be configured, and the quenching temperature can be grasped by mastering the process time. The goal.

(3) Good quenching system. Under the conditions of the quenching result of the tube, the quenching agent with a slower cooling gas is selected to prevent the tension quenching deformation and cracking. Because the quenching temperature of casting residual heat is higher than the general quenching temperature, the forging is good in hardenability, so carbon steel and alloy steel are generally selected from oil or PAG quenching agent.

The quenching tank should have sufficient volume, the cooling time can be controlled, and the quenching medium recirculation, cooling system and heating assembly should be arranged. The quenching medium temperature is automatically mastered, and the exhaust assembly should also be configured. Enhance the protection of the quenching medium, regularly check the cooling performance of the quenching medium, clean the impurities such as scale in the liquid tank and the recirculation system, and keep the quenching medium clean.

(4) The location of the tempering and tempering furnace after quenching. After the forging is quenched, there is a large stress inside it, which causes large deformation and even cracking during the placement process. In order to prevent deformation and cracking of the parts after quenching, the forgings after quenching should be tempered in real time. After the forging is quenched, the time of donation can be related to the material, shape and ambient temperature of the forging. It needs to be determined by experiment. For the diligent power and progress of the tempering furnace, the insulation energy consumption is reduced, and the forgings that receive the residual heat quenching are generally densely tempered in the heat treatment workshop.