Precision forging process for engine connecting rod and precision forging die
An engine connecting rod and precision forging technology, which is applied in the field of forging technology, can solve the problems of poor forging size or weight, too thin thickness of engine connecting rod forgings, small cross-sectional area, etc., and achieve high dimensional accuracy of forgings, superior performance, Simple operation and reliable effect
Inactive Publication Date: 2011-05-11
山西柴油机工业有限责任公司
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Problems solved by technology
Its disadvantages and deficiencies are: engine connecting rod forgings are too thin in thickness, small in cross-sectional area, fast in temperature cooling, high in deformation resistance, serious in forging die wear and plastic deformation, resulting in excessive size or weight of forgings, and extremely low service life of forging dies , poor die forging process
[0005] Therefore, it is difficult to meet the shape, size, quality and performance requirements of the engine connecting rod die forgings with the existing die forging process and forging dies
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[0029] The precision forging process of engine connecting rod of the present invention is:
[0030] 1) Blanking→heating: heat the billet with the material grade of 42CrMoA and the size of ￠30mm×128mm in an intermediate frequency heating furnace or a gas furnace, and strictly control the initial forging temperature of forging according to the heating specification. After the billet is heated, the initial forging temperature is 1180℃~1200℃.
[0031] In order to facilitate the consistency of the forging shape, size, cold shrinkage rate and performance of the first final forging and the second finishing forging.
[0032] 2) Die forging: The die forging process includes elongation, the first final forging and the second precision forging, that is, firstly, the selected and heated billet is drawn in the closed drawing die cavity 4 to elongate the long rod, and then in the first final forging The final forging is done in the forging die chamber 1, and then the forging formed in the ...
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Abstract
The invention relates to a precision forging process for an engine connecting rod and a precision forging die, which achieve the requirements of shape, size, quality and performance of super precision die forgings under the conventional on-hammer die forging process condition. The precision forging process for the engine connecting rod comprises the following processes: blanking, heating, die forging (drawing, first finish forging and second precision forging), trimming, third correction and coining, thermal treatment, clearing and inspection. The precision forging die comprises the following seven main parts: a first finish forging impression (1), a second precision forging impression (2), a third correction and coining impression (3), a drawing impression (4), a diagonal guide lock catch (5), a first finish forging impression flash gutter (6) and a second precision forging impression flash gutter (7). The process is applied to precision forging formation of the engine connecting rod under the conventional on-hammer die forging process condition, and provides powerful reference basis for precision forging formation of other similar small die forgings.
Description
technical field [0001] The invention relates to the technical field of forging technology, in particular to an engine connecting rod precision forging technology and a precision forging die. Background technique [0002] The engine connecting rod is a key part of the unmanned aircraft, and it is used in occasions where the design quality is limited under complex stress and shock vibration and heavy-duty working conditions. If the engine connecting rod fails or is damaged, it will directly cause a serious accident of the product or cause the system function to fail. Therefore, engine connecting rod forgings have higher requirements on the shape, size, quality and performance of forgings. [0003] According to the national standard GB12362 "Steel Die Forging Tolerance and Machining Allowance", according to parameters such as forging weight, material coefficient, size, shape complexity coefficient, misalignment, residual flash, and shape and position tolerance symmetry, the en...
Claims
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Login to View More IPC IPC(8): B21J5/02B21J13/02B21K3/00
Inventor 李志广张健梁万法张炜王刚
Owner 山西柴油机工业有限责任公司