Progressive forging forming method for large cake forged pieces

A progressive, forging technology, applied in the direction of vehicle parts, transportation and packaging, wheels, etc., can solve the problems of inability to ensure uniformity of forming, anisotropy of mechanical properties, lack of continuity, etc., to improve the direction of metal flow and promote the elimination of And the effect of repairing and reducing production cost

Inactive Publication Date: 2011-04-27
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

During the forming process, the contact surface between the anvil and the workpiece is relatively fixed, and it is easy to produce obvious axial and transverse tensile stress, which is not conducive to the elimination and repair of internal void defects and is easy to induce microcracks. At the same time, the metal flow direction is single, lacks continuity, a

Method used

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  • Progressive forging forming method for large cake forged pieces
  • Progressive forging forming method for large cake forged pieces
  • Progressive forging forming method for large cake forged pieces

Examples

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Embodiment

[0020] This example is a progressive forging of a large press cylinder bottom part. The forging process is completed on a 160MN press. The blank is a cast steel cylindrical billet 2 of Φ3500mm×1800mm, and the upper anvil is a V-shaped anvil with an angle of 135°. Anvil 1 (eg image 3 Shown), the lower anvil is a large platform 3, and the ring sleeve 4 plays a role in positioning and clamping. 1) Installation and adjustment: place the cylindrical billet 2 with an average temperature of 1200°C and a size of Φ3500mm×1800mm on the large platform 3, and fix it with the ring sleeve 4, so that the anvil surface of the upper anvil 1 and the axis of the billet 2 form an included angle of 15° (Such as figure 1 shown), and adjust the position of the blank to ensure that the forming process starts from the riser end of the blank. In this way, the anvil can properly improve the metal flow direction, and the metal flow at the anvil joint can be smooth, which can increase the axial ductili...

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Abstract

The invention discloses a progressive forging forming method for large cake forged pieces. The method comprises the following steps of: installation and regulation; first single-side forming; second, third and fourth single-side forming; multiple turnover forming; and rounding and reshaping. By adopting progressive anvil distribution and anvil conveying modes, progressive contact of anvils and forged pieces in each anvil pressing process is ensured; three-directional pressure stress is provided for promoting elimination and recovery of internal gap defects; single metal flowing direction is improved; because of the adoption of progressive forging, local deformation is asynchronous, press load is reduced, the production efficiency of equipment is improved, the forming force is reduced, and high work efficiency with the small equipment is realized; and small forging ratio formation can be realized, and the processing period is shortened so as to reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of free forging, and in particular relates to a progressive forging forming method for large cake forgings. Background technique [0002] Most of the large-scale cake forgings are key components for manufacturing major technical equipment. The common large-scale cake forgings include: nuclear power pressure vessels, steam turbine impellers, large heads, large press cylinder bottoms and other forgings. High cost and high quality requirements. At present, my country's large forging industry has the characteristics of scattered productivity, low production efficiency, aging equipment, low production capacity, and low level of mechanization. At present, it is still mainly relying on innovative technology to achieve "small equipment to do big work". For this reason, the optimization of the process is very important. . Commonly used forming methods for large cake forgings include: lower flat anvil drawing length,...

Claims

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Application Information

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IPC IPC(8): B21K1/32
Inventor 王梦寒李玉凤徐志敏门正兴周杰
Owner CHONGQING UNIV
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