Jiaxing bearing | improper operation of several common forging process defects

There is rotational, have HRB bearing ( ) Jiaxing bearing group sales co. , LTD. ( The company) Is bearing group co. , LTD. Established in jiaxing spot sales window, specializing in HRB brand bearings, facing the whole country, the existing stock 50 million yuan, covers the whole bearing, have very strong spot supply, is the group's retail sales center. 1. Big grain grain is usually caused by a lack of forging temperature and deformation degree, or finish forging temperature is too high, or caused by the deformation degree fell into critical deformation zone. Aluminum alloy deformation degree is too big, form texture; High temperature alloys deformation temperature is too low, the formation of deformation mixed can also cause bulky grain, coarse grains will reduce the plasticity and toughness of forgings, fatigue performance significantly decreased. 2. Uneven uneven grain of grain is refers to the special thick grain of forging parts, some parts are smaller. Produce uneven grain is the main reason of the billet throughout the deformation uneven grain crushing degree is differ, or local deformation degree fell into the critical deformation zone, or high temperature alloy local work hardening, or quenching heating local coarse grains. Heat resistant steel and high temperature alloy particularly sensitive to uneven grain. Uneven grain will make the forgings durable performance, fatigue performance significantly decreased. 3. Cold hard phenomenon when the deformation due to the low temperature or deformation speed too fast, and too fast cooling after forging, both may be caused by recrystallization softening of reinforcement (caused by deformation of can't keep up with Hardening) After, so that the hot forging forgings interior is still keeping the cold deformation. The existence of this organization to improve the strength and hardness of the forgings, but reduces the plasticity and toughness. Serious hard phenomenon may cause cold forging cracking. 4. Crack crack usually existed during forging large tensile stress, shear stress or stress caused by William gallas. Crack parts is often happened in billet the thinnest part of the largest stress and thickness. If the billet surface and internal micro cracks, or blank within tissue defect, improper or hot working temperature to lower material plastic, too much too fast or deformation, deformation degree, more than material allows the plastic handle, etc. , are removed from the coarse, long pull, punching, reaming, bending and extrusion process can produce crack. 5. Cracking cracking is present shallow tortoise in forging surface shape crack. The surface of the tensile stress in the forging forming ( For example, is not full of extruding part or the curved part) The easiest way to produce this kind of defect. Cause the cause of cracks may be various: (1) raw materials of fusible element such as cu, sn and too much. (2) when heated to high temperature for a long time, steel material surface of copper precipitation and surface coarse grains, decarburization, or after a lot of heating surface. (3) fuel sulfur content is too high, there is sulfur impregnation steel material surface, if you are looking for the above jiaxing bearing group co. , LTD. The author introduces the bearing inspection and replacement of interest or have any questions, please click on the website on the right side of the online customer service or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - Editor: jiaxing bearing sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source