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Hot and cold joint forging near net shape process of forged steel piston head in wavy combustion chamber

A near-net shape and combustion chamber technology, applied in the direction of pistons, manufacturing tools, metal processing equipment, etc., can solve the problems of reducing product performance, increasing product manufacturing costs, and destroying product metal flow lines, so as to reduce CO2 emissions and reduce Surface roughness value, effect of high fatigue life

Active Publication Date: 2019-02-01
ANHUI ANHUANG MACHINERY
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  • Claims
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Problems solved by technology

Its main defect is that mechanical processing destroys the metal flow line of the product, reduces product performance, and increases the manufacturing cost of the product at the same time

Method used

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  • Hot and cold joint forging near net shape process of forged steel piston head in wavy combustion chamber
  • Hot and cold joint forging near net shape process of forged steel piston head in wavy combustion chamber
  • Hot and cold joint forging near net shape process of forged steel piston head in wavy combustion chamber

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Embodiment Construction

[0031] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments and accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all . Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

[0032] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0033] A near-net-shaping process of forging steel piston heads in a corrugated combustion chamber, combined with hot and cold forging, the process route is as follows:

[0034] Blanking → intermediate frequency heating → upsetting → pre-forging → final forging → shot blasting → pre-treatment → cold precisi...

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Abstract

The invention provides a hot and cold joint forging near-net forming technology for a forged steel piston head of a wave-shaped combustion chamber, and relates to the technical field of machining. The technology comprises the following steps of feeding, medium frequency heating, jumping-up, pre-forging, finish forging, shot blasting, pretreatment, cold precision forging and final treatment. The technology is characterized in that the finish forging is thermal state finish forging closed forming, the thermal state finish forging closed forming uses a hollow shunt forging forming technology, shunting opening of materials are designed in a die, die forging forming load is reduced, and the service life and the material forming performance of the die are improved; and a blank does not need spheroidizing annealing before cold precision forging, and specified technical requirements are achieved by lubricating the pressure-sizing surface and controlling die contact and equipment pressure. According to the hot and cold joint forging near-net forming technology for the forged steel piston head of the wave-shaped combustion chamber, the precision and performances of a product can be improved, the production efficiency is improved, and the production cost is reduced; and the shunting opening of the materials is established in the forming part of the blank or the die, the blank is produced by closed hot die forging, precision forging allowance is reserved, and then the cold precision forging is conducted on the piston head blank of the wave-shaped combustion chamber.

Description

technical field [0001] The invention relates to the technical field of engines and forging, in particular to a combined hot and cold forging process suitable for nearly net forming of engine pistons in wave-shaped combustion chambers. Background technique [0002] With the rapid improvement of the country's engine emission standards and the continuous advancement of engine energy-saving and emission-reduction technologies, forged steel pistons are used in high-performance diesel engines due to their excellent performance in high explosion pressure, high fatigue life, fuel economy, and emission reduction. The amount of application is increasing. [0003] At present, the blanks of forged steel piston heads are mostly open-type hot die forging, and then the blanks are machined to become finished pistons. Its main defect is that mechanical processing destroys the metal flow line of the product, reduces product performance, and increases the manufacturing cost of the product at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/18B21J13/02B21J5/02
CPCB21J5/025B21J13/02B21K1/18
Inventor 程功徐宝国宋加兵黄昌文
Owner ANHUI ANHUANG MACHINERY
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