Method for improving large-specification electrically-upset end face concave and promoting grain refining

A large-scale, end-face technology, applied in the direction of manufacturing tools, forging presses, forging/pressing/hammer devices, etc., can solve the problems of grain coarsening, uneven material deformation, and large sinking depth of electric upsetting deformed bodies, and achieve The effect of reducing the sinking depth, increasing the degree of uniform refinement, and slowing down the flow

Active Publication Date: 2020-05-01
NANJING INT MARINE EQUIP & SPARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, if the subsidence depth is too large, the deformation of the material will be uneven, and the collapse defect, that is, the end face depression will be formed during the electric upsetting process. At the same time, the end face depression will also cause the grains in the center of the electric upsetting deformed body to coarsen
On the other hand, in the subsequent die forging forming process, if the sinking depth is too large, the problem of "air-holding" will occur

Method used

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  • Method for improving large-specification electrically-upset end face concave and promoting grain refining
  • Method for improving large-specification electrically-upset end face concave and promoting grain refining
  • Method for improving large-specification electrically-upset end face concave and promoting grain refining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Both Example 1 and Example 2 use the electric upsetting finite element model to simulate the electric upsetting process. The material is Nimonic80A superalloy, the diameter of the rod is 85mm, the length is 3700mm, and the total stroke of the rod is 2350mm. For this kind of super-sized air valve billet with long rods, a lot of aggregates, and a large variable section ratio, under the condition of ensuring that the electric upsetting process is not unstable, the maximum upsetting force used in the electric upsetting process is 1030KN. , the maximum current is 28.6KA, and the maximum temperature during the electrical upsetting simulation process is 1130°C.

[0046] Example 1

[0047] (1) At 725 seconds, the simulated shapes of electric upsetting of planar anvil electrode and concave anvil electrode are as follows: Figure 6 and Figure 7 As shown.

[0048] At 725 seconds, there is little difference in the simulated temperature of electric upsetting for the two types of...

Embodiment 2

[0059] The difference between this embodiment and embodiment 1 is only that: the combined form of material reduction and the rounded corner of the aggregate end are 28mm.

[0060] refer to Figure 12 As shown, after the electric upsetting is completed, the diameter of the electric upsetting garlic head using the concave anvil is 198.28mm, and the sinking depth is only 4.64mm. The diameter of the electric upsetting garlic head of the flat anvil is 196.88mm, and the sinking depth is 8.3mm. Compared with the planar anvil, the diameter of the electric upsetting garlic head becomes larger, and the sinking depth decreases.

Embodiment 3

[0062] The difference between this embodiment and embodiment 2 is only that the rounded corner of the aggregate end is 35 mm.

[0063] refer to Figure 13 As shown, after the electric upsetting is completed, the diameter of the electric upsetting garlic head using the concave anvil is 195.12mm, and the sinking depth is 8.27mm. The diameter of the electric upsetting garlic head of the flat anvil is 196.88mm, and the sinking depth is 8.3mm. Compared with the planar anvil, the diameter of the electric upsetting garlic head becomes smaller, and the sinking depth decreases.

[0064] From the experimental results of Examples 1 to 3, it can be seen that the combination of the concave anvil and the material reduction treatment can always reduce the sinking depth. Under the synergistic effect with the concave anvil, with the increase of R1, the diameter of the electric upsetting garlic gradually decreases, the shape transition of the electric upsetting is relatively smooth, and the d...

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Abstract

The invention discloses a method for improving large-specification electrically-upset end face concave and promoting grain refining, the sinking depth can be reduced, and grain refining can be promoted. The method comprises the following steps that rod material pretreatment is conducted; material reduction treatment is conducted on the edge areas on the two end faces of a rod material, and the contact area between the two end faces of the rod material, an anvil electrode and an upsetting cylinder can be reduced; the concave face type anvil electrode is adopted for conducting electric upsettingon the rod material on an electric upsetting device, pre-contact is provided for the peripheral face of a garlic head through the concave face type anvil electrode, plastic deformation happens to thepre-contact part, and accordingly sinking depth increasing is hindered; meanwhile, due to material reduction treatment, axial upsetting force is transmitted to the center of the garlic head in a centralized manner, and accordingly the concave of the end face of the garlic head is corrected; and along with improvement of the concave degree, garlic head grains are evenly refined.

Description

technical field [0001] The invention belongs to the field of metal plastic forming in material processing engineering. Specifically, it is a process improvement technology for improving the concavity and shape of the end face of the garlic head formed by electric upsetting of the oversized air valve billet. Background technique [0002] The electric upsetting process is a forming process that couples the three physical fields of electric heating. The schematic diagram of the working principle of the electric upsetting machine is as follows: figure 1 As shown, a current is passed between the anvil electrode 1 and the clamping electrode 2 to heat through the contact resistance and its own resistance, and a certain upsetting force is applied to the right end of the rod material 3 through the upsetting cylinder 4, and the rod material at the cold end is sent to It enters the heating area between the anvil electrode and the clamping electrode, so that the rod material gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21J9/08B21J13/06
CPCB21J5/08B21J9/08B21J13/06
Inventor 陈舒婷戴魏魏蒋立鹤蒋倩王子晗权国政王洋张帜裴艳艳张钰清
Owner NANJING INT MARINE EQUIP & SPARES
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