A Hole Reaming Method for Reducing Bell Mouth Defects of Cylindrical Forgings
A cylindrical and bell mouth technology is applied in the field of reaming to reduce the defects of the bell mouth of the cylindrical forging, which can solve the problems of insufficient rigidity of the mandrel and the defects of the bell mouth of the cylindrical forging, so as to reduce the production cost and avoid the Horn hole defect, effect of increasing stiffness
Active Publication Date: 2017-12-19
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a method for reaming the hole of the cylindrical forging that reduces the defect of the bell mouth, and to solve the problem of the cylindrical forging in the process of reaming due to the lack of rigidity of the mandrel in the prior art. Technical Problems of Bell Mouth Defects
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[0020] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description with reference to the accompanying drawings. It should be understood that the present invention can have various changes in different embodiments without departing from the protection scope of the present invention, and the descriptions and illustrations therein are essentially for illustration rather than for limit the invention.
[0021] The finished size of a cylindrical forging is as follows: outer diameter Φ2880mm, inner diameter Φ2435mm, height 3220mm, a mandrel with a diameter of Φ1120mm is selected, and a bell mouth defect occurs after reaming with a conventional reaming device, such as figure 1 As shown, the subsequent process requirements cannot be met. After using the following technical solution of the present invention, the diameter of the mandrel does not change, but the bell mouth defect is avoided, and the subsequen...
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The invention discloses a hole expanding method for reducing horn mouth defects of a cylindrical forge piece, and relates to a hole expanding process of a core shaft of the cylindrical forge piece. The hole expanding method aims to solve the technical problem of horn mouth defects, caused by insufficient rigidity of the core shaft, of the cylindrical forge piece in the hole expanding process in the prior art. The hole expanding method disclosed by the invention comprises the following concrete steps of arranging an upper bracket of a mandrel supporter in a lower bracket of the mandrel supporter; inserting the core shaft into a hole of a cylindrical blank and erecting the core shaft on the upper bracket of the mandrel supporter; performing core shaft hole expanding; inserting a core shaft rigidity reinforcing plate into a narrow rectangular groove of the upper bracket of the mandrel supporter when the inner diameter of the cylindrical forge piece blank is expanded enough to accommodate the diameter of the core shaft and a mandrel supporter rigidity reinforcing plate; and still performing the core shaft hole-expanding process until the cylindrical forge piece has the size of a finished product. Compared with the prior art, the hole expanding method disclosed by the invention has the characteristics that the core shaft rigidity reinforcing plate is additionally arranged in the core shaft hole expanding process, namely the rigidity of the core shaft is increased, so generation of horn mouth defects of the cylindrical forge piece can be prevented in the hole expanding process; meanwhile, the diameter of the core shaft can be reduced, and the production cost can be lowered.
Description
technical field [0001] The invention belongs to the technical field of thermal processing of metal materials, and in particular relates to a hole-enlarging method for reducing bell mouth defects of cylindrical forgings. technical background [0002] In the technical field of thermal processing of metal materials, the mandrel reaming process is commonly used for forging cylindrical forgings. When the mandrel is used to expand the hole, as the wall thickness of the cylindrical forging is thinned, the inner and outer diameters are enlarged at the same time, and the height is slightly increased. In order to obtain a forging with a smoother inner wall, the diameter of the mandrel should generally increase with the enlargement of the hole diameter. [0003] With the further development of the large-scale trend of cylindrical forgings, the diameter of cylindrical forgings is getting larger and higher, and the height is getting higher and higher. Limited to equipment and economic ...
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IPC IPC(8): B21J5/06
CPCB21J5/06
Inventor 田继红郭丰伟秦敏张华煜李景丹刘建生郑晓华何文武段兴旺王文浩
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY