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A method for improving the end face depression of large-scale electric upsetting and promoting the uniform refinement of grains

A large-scale, end-face technology, used in forging presses, forging/pressing/hammering machinery, manufacturing tools, etc., can solve problems such as large subsidence depth, uneven material deformation, and coarsening of electric upsetting deformed body grains. Achieve the effect of improving sag, convenient and flexible use, and improving the degree of grain uniformity and refinement.

Active Publication Date: 2021-08-31
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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  • A method for improving the end face depression of large-scale electric upsetting and promoting the uniform refinement of grains
  • A method for improving the end face depression of large-scale electric upsetting and promoting the uniform refinement of grains
  • A method for improving the end face depression of large-scale electric upsetting and promoting the uniform refinement of grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] EXAMPLE 1 is equipped with an electrical linear model with an electrical linear model, and the material is Nimonic80A super-alloy, the rod diameter is 85mm, the length is 3700mm, and the total stroke is 2350 mm. For this long-rod, large-scale gas valve blanks larger, the variable cross-section rate is large, in the case of ensuring that the electrical running process is unstable, the upsetting force used in the electric assembly process is 1030kn. The maximum current is 28.6kA, and the highest temperature in the electrical simulation process is 1130 ° C.

[0046] Example 1

[0047] (1) In 725 seconds, the electrode analog forming shape of the planar alant electrode and the concave avenitor Image 6 and Figure 7 The indicated.

[0048] At 725 seconds, the electrode analog temperature of the two types of angeles is not large. The electrode analog temperature of the planar avenitor is 1120 ° C, and the electrode analog temperature of the concave avenitor is 1121 ° C.

[0049] A...

Embodiment 2

[0059] The difference from the first embodiment is only: the circle of the reduction combination and the circle of the collector end of 28 mm.

[0060] refer to Figure 12 As shown, after the electro-completion is completed, the electric coat with a concave annulus is 198.28 mm, and the depth depth is only 4.64 mm. The electrodes of the planar ackvation of 196.88 mm, the depth depth is 8.3 mm. Compared with the planar avenge, its electric garlic has become larger, and the depth depth is reduced.

Embodiment 3

[0062] The difference from the embodiment 2 is only that the rounded corners of the collector end are 35 mm.

[0063] refer to Figure 13 As shown, after the electrical completion is completed, the electric coated with a concave avenitor is 195.12 mm, and the depth depth is 8.27 mm. The electrodes of the planar ackvation of 196.88 mm, the depth depth is 8.3 mm. Compared with the planar alant, its electric garlic has a size diameter, and the depth depth is reduced.

[0064] It can be seen from the experimental results of Examples 1 to Example 3, and the binding of the concave annoding treatment is always reduced by the depth of the sink. With the synergies of the concave annvid, as R1 increases, the diameter of the electric garlic is gradually decreased, and the transition of the electrical shaped shape is relatively smooth, and the diameter variation is relatively smooth. However, the end face of the electric garlic has gradually increased (still smaller than the planar anniot). Th...

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Abstract

The invention discloses a method for improving the sag on the end surface of large-scale electrical upsetting and promoting the uniform refinement of grains, which can reduce the sinking depth and promote the uniform refinement of grains; it includes the following steps: rod material pretreatment: the two ends of the rod material The material reduction treatment is performed on the edge area, so that the contact area between the two ends of the rod material and the anvil electrode and the upsetting cylinder can be reduced; the concave anvil electrode is used to perform electric upsetting on the rod material on the electric upsetting device, and the concave anvil The electrode provides pre-contact to the outer peripheral surface of the garlic, so that the pre-contact part undergoes plastic deformation, thereby hindering the deepening of the sinking depth; at the same time, the material reduction treatment makes the axial upsetting force concentrated and transmitted to the center of the garlic, thereby correcting the depression of the end surface of the garlic; With the improvement of the degree of depression, the garlic grains are uniformly refined.

Description

Technical field [0001] The present invention belongs to the material processing engineering metal forming art. In particular a method for improving the large size of the electric valve upsetting blank garlic recessed end surface shape and process improvement techniques. Background technique [0002] Electrically coupling the upsetting process is a process of forming three physical thermal electric field, the working principle schematic diagram of such electric upsetting figure 1 Shown in FIG. 1 with the clamping electrode current pass between the anvil electrode 2, through the contact resistance and resistance heating itself, and the right end of the rod material 3 apply a certain force upsetting upsetting cylinder 4, the cold end of the rod material sent the anvil heating region sandwiched between the electrode and the electrode, the plastic deformation of the rod material and complete local precise gradually feeding a continuous polymerization occurs at a certain temperature co...

Claims

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Application Information

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Patent Type & Authority Patents(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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