产品说明：要获得致密、高性能的平焊法兰锻件、必须正确选择锻造温度、速度、变形力等参数。平焊法兰锻造变形初期，由于多孔的预成形坯易变形、变形力较小，密度增加较快。锻造成形后期，由于大部分孔隙闭合，变形抗力增大，要消除残留孔隙所需变形力迅速增高。变形抗力与变形温度密切相关，较高的变形温度有利于致密，并降低变形抗力。较高的变形速度同样也有利于平焊法兰致密。为此，必须综合考虑诸因素对锻件质量影响，选择工艺参数。对于低合金钢，一般在1125度下锻造。但是在850-900度区间也有一个低的流动应力。平焊法兰低温锻造可避免高温锻造时的晶粒粗化，省去锻后正火处理。有利于节约能源、提高模具寿命，同时也可以改善平焊法兰性能，预成形毛坯锻打前加热，需要在压力保护气氛下进行。为了防止氧化和脱碳，一般在惰性气体或氢气保护下的电炉内进行。在平焊法兰锻打生产线上一般采用保护气氛下的高频感应加热。加热时间，可根据材料合金化程度、氧含量及预成形坯的尺寸大小确定。加热时间应该以热透为准，即平焊法兰毛坯原料内外温度均匀。当达到锻造温度和加热时间后，就应立即进行锻造。加热好的预成形毛坯在锻造前，总是要在空气中放一段时间，由于预成形毛坯内孔间隙的存在，要发脱碳生或氧化，为此，应严格控制暴露时间。根据暴露时间对锻后平焊法兰性能影响规律，确定预成形坯锻造前在空气中的转移时间。一般对于合金平焊法兰，特别或高合金钢平焊法兰预成形坯，高温暴露时间不应大于5分钟。为了减小氧化和脱碳倾向，也可以在预成形坯上喷涂胶体石墨润滑剂或玻璃润滑剂。 The product description: to obtain the compact, high performance horizontal welding flange forging, must correctly choose the parameters such as the forging temperature, speed and deformation force. In the initial phase of the forging of flanged flange forging, the density increases fast because of the preforming of the porous preform, the deformation force is small. After the forging of forming, the deformation force is increased by most pore closure, and the deformation force of residual pore is removed rapidly. Deformation resistance is closely related to deformation temperature, the high deformation temperature is good for density, and the deformation resistance is reduced. The higher deformation velocity also benefits the flanged flanges. To this end, the influence of the factors on the quality of the forging and the process parameters must be taken into consideration. For low alloy steel, it is usually forged at 1125 degrees. But there is also a low flow stress in the 850-900 interval. Low temperature forging of flat welding flanges to avoid the grain roughing in hot forging, and the treatment of hot forging after forging. To save energy and improve die life, at the same time also can improve the performance of flat welding flange, forging preform billet heating, before need under pressure protective atmosphere. In order to prevent oxidation and decarburization, it is usually carried out in an electric furnace under the protection of inert gas or hydrogen. The high frequency induction heating under the protection atmosphere is generally adopted in the production line of flat welding flange forging. The time of heating can be determined according to the degree of alloying of the material, the amount of oxygen and the size of the preformed billet. The heating time should be based on the heat penetration, which is the temperature uniformity inside and outside the raw material of the flanged flange. When the forging temperature and heating time are reached, the forging should be made immediately. Good before forging preform billet heating, always put a period of time, in the air because of the existence of preformed blank inner hole clearance to send decarburization raw or oxidation, therefore, should strictly control the exposure time. According to the performance of the flanged flanged flanges, the transfer time of pre-formed billet in the air is determined. Normally for alloy flat welding flanges, special or high alloy steel flat welding flange preformed, high temperature exposure should not be greater than 5 minutes. In order to reduce oxidation and decarburization, you can also spray colloidal graphite lubricants or glass lubricants on pre-formed billet.