V-shaped anvil for drawing out large-specification round rod and method for drawing out large-specification round rod

A large-scale, round bar technology, used in the manufacture of tools, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc., can solve solidification defects and micro-crack expansion, unqualified flaw detection, and difficult to guarantee The quality of the final product and the qualified rate of flaw detection can solve the problem of coarse eutectic carbide.

Pending Publication Date: 2021-10-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, the upper and lower flat anvils are often used to elongate the metal blank. The metal blank is subjected to two forces, the metal deforms and flows in the axial and radial directions, and the core is subjected to tensile stress in multiple directions, resulting in solidification defects. and micro-cracks grow larger, resulting in unqualified final flaw detection, especially for forged ledeburite tool and die steel large-size round bars, it is difficult to ensure the final product quality and flaw detection pass rate when the upper and lower flat anvils are drawn long

Method used

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  • V-shaped anvil for drawing out large-specification round rod and method for drawing out large-specification round rod
  • V-shaped anvil for drawing out large-specification round rod and method for drawing out large-specification round rod
  • V-shaped anvil for drawing out large-specification round rod and method for drawing out large-specification round rod

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preparation example Construction

[0036] The present invention has no special limitation on the preparation method of the electroslag ingot, and the electroslag ingot can be prepared by adopting the preparation method of the electroslag ingot well-known to those skilled in the art.

[0037] In the present invention, the composition of the electroslag ingot is preferably a ledeburite tool steel composition, more preferably a Cr12MoV composition.

[0038] The present invention has no special limitation on the specific upsetting method, and the upsetting method well-known to those skilled in the art can be used for upsetting. In the present invention, the diameter of the upset blank is preferably ≥1700mm.

[0039] In the present invention, the single-pass reduction in the elongation process is preferably 15-30%, more preferably 20-25%, and most preferably 22-23%.

[0040] In the present invention, the feeding amount in the elongating process is preferably 650-700 mm, more preferably 660-690 mm, and most preferab...

Embodiment 1

[0050] The present embodiment adopts V-type anvil to carry out the production of the Cr12MoV steel round rod that diameter is 850mm:

[0051] After the electroslag ingot pier is thickened, use figure 1 and figure 2 The V-shaped anvil of the structure shown is drawn, the V-shaped angle α is 150°C, the side length a is 100mm, the anvil height b is 800mm, the anvil length c is 1500mm, and the anvil width d is 800mm.

[0052] Select the above-mentioned V-shaped anvils with upper and lower symmetry for the drawing length. During the drawing process, the single-pass reduction is 27%, and the feeding amount is 680mm. The secondary reduction was 8%, and the finished product was obtained.

[0053] The finished product is spheroidized and annealed.

[0054] The main components of the Cr12MoV round rod prepared in Example 1 of the present invention are: 1.6wt% C; 12.1wt% Cr; 0.35wt% Si; 0.5wt% Mo; 0.3wt% Mn; 0.02wt% S 0.025wt% P; 0.2wt% V; balance Fe.

[0055] Observe the eutectic ...

Embodiment 2

[0057] The present embodiment adopts V-type anvil to carry out the production of the Cr12MoV steel round rod that diameter is 1000mm:

[0058] After the electroslag ingot pier is thickened, use figure 1 and figure 2 The V-shaped anvil of the structure shown is drawn, the V-shaped angle α is 148°C, the side length a is 100mm, the anvil height b is 800mm, the anvil length c is 1500mm, and the anvil width d is 800mm.

[0059]Select the upper and lower symmetrical V-shaped anvils for combination in the drawing length. The single-pass reduction during the drawing process is 30%, and the feeding amount is 650mm. The sub-reduction is 10%, and the finished product is obtained.

[0060] The finished product is spheroidized and annealed.

[0061] The main components of the Cr12MoV round rod prepared in Example 2 of the present invention are: 1.55wt% C; 12.5wt% Cr; 0.4wt% Si; 0.55wt% Mo; 0.4wt% Mn; 0.03wt% S 0.03 wt% P; 0.28 wt% V; balance Fe.

[0062] Observe the eutectic carbide ...

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Abstract

The invention provides a V-shaped anvil for drawing out a large-specification round rod. The V-shaped anvil comprises an upper anvil and a lower anvil, wherein the upper anvil and the lower anvil are vertically symmetrical V-shaped anvils. According to the V-shaped anvil, the V-shaped included angle ranges from 146 degrees to 150 degrees, the side length is 100 mm, the height of the anvil is 800 mm, the length of the anvil is 1500 mm, and the width of the anvil is 800 mm. The invention provides a method for drawing out the round rod with the diameter specification of 800-1000 mm by adopting the V-shaped anvil, the V-shaped anvil is specially used for a process for drawing out the large-specification round rod with the diameter of 800-1000 mm, and a drawing-out method matched with the anvil is provided, so that the problems of coarse eutectic carbides at the core part of ledeburite tool steel and flaw detection caused by coarse eutectic carbides are solved. The invention further provides a method for drawing out the large-specification round rod.

Description

technical field [0001] The invention belongs to the technical field of large-size round bar forging, and in particular relates to a V-shaped anvil for drawing a large-size round bar and a method for drawing a large-size round bar. Background technique [0002] Elongation is one of the main methods and means of metal forging processing, which can achieve the purpose of improving the deformation of the core, breaking the coarse grains and eutectic carbides of casting. In actual production, the upper and lower flat anvils are often used to elongate the metal blank. The metal blank is subjected to two forces, the metal deforms and flows in the axial and radial directions, and the core is subjected to tensile stress in multiple directions, resulting in solidification defects. And the micro-cracks grow larger, resulting in the failure of the final flaw detection, especially for large-size round bars of forged ledeburite tool and die steel, it is difficult to guarantee the quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J13/06C21D1/32C21D8/06C22C38/02C22C38/04C22C38/22C22C38/24
CPCB21J13/06C21D1/32C21D8/065C22C38/02C22C38/22C22C38/04C22C38/24
Inventor 肖强康琴罗许刘序江
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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