Production method of forging piece
A manufacturing method and technology for forgings, applied in the field of forgings manufacturing, can solve the problems of increasing man-hours, reducing the qualification rate of forgings, etc.
Active Publication Date: 2015-05-20
HITACHI METALS LTD
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Problems solved by technology
In this way, if a part of the forged blank is freely deformed, in order to carry out die forging in the next process, the deformed part of the forged blank needs to be re-forged in the required prescribed shape in the next process, and the burrs need to be cut, so there is Resulting in the risk of reducing the qualified rate of forgings and increasing man-hours
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[0019] As described above, an important feature of the present invention is to employ two upsetting steps of the first upsetting step and the second upsetting step of upsetting and pressing the cylindrical blank by a predetermined length in the axial direction. Thereby, for example, even if an elongated blank having an L / D of more than 3 is used, forging can be performed while suppressing occurrence of buckling. Hereinafter, the present invention will be described in detail in conjunction with the accompanying drawings.
[0020] figure 1 It is a figure which schematically shows the manufacturing method of the forging of this invention. figure 1 The first shown pressing die 1 and the second pressing die 2 all have the effect of two aspects, namely, as the effect of the anvil that limits the end of cylindrical blank 4; The role of the pressing part of the mold for upsetting and pressing with a predetermined length.
[0021] The first pressing die 1 and the second pressing die...
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The invention provides a production method of a forging piece, which can be used to solve the buckling problem by adjusting the deflection during the upset process from two sides in the length direction of the blank, can be used to improve the qualified rate, and to reduce the working time. In the production method, the module group can be used for the upset, and is provided with a first pressing module, a second pressing module, and a middle module. The middle module is disposed between the two pressing modules. A heated cylinder-shaped blank is inserted into a module cavity of the middle module, and the first pressing module is disposed under that, the second pressing module is disposed above that. Then the first upset process can be carried out by pressing the cylinder-shaped lank by using the second pressing module according to the predetermined length axially in an upset manner. The module group can be rotated upwards and downwards with the cylinder-shaped blank together, then the second pressing module is disposed under that, the first pressing module is disposed above that. The second upset process can be carried out by pressing the cylinder-shaped lank by using the first pressing module according to the predetermined length axially in an upset manner.
Description
technical field [0001] The present invention relates to a method of manufacturing a forging using hot upset forging. Background technique [0002] In the past, for the purpose of improving the mechanical properties of the product and improving the internal characteristics such as the crimping of shrinkage cavities, hot forging was applied to blanks such as steel or alloys to refine the crystal grains and homogenize the structure. [0003] In this upset forging, if the L / D ratio when the length of the blank is L and the diameter is D is large, that is, if L is long relative to D, when performing upset forging, the force is applied from the axial direction. Buckling occurs at or near the central portion of the pressed blank. Therefore, it has been empirically known that L / D should be 3 or less as a condition for a blank shape that does not cause buckling. [0004] In order to suppress the buckling that occurs when the elongated material is upset, for example, in Patent Docum...
Claims
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IPC IPC(8): B21J5/08B21J13/02
CPCB21J5/08
Inventor 松本英树栂贵志鴫原祐介福井毅
Owner HITACHI METALS LTD