Forging method for refining grain size of long-bar-type steel forge piece

A technology for steel forgings and grain size, which is applied in the forging of refining the grain size of long rod steel forgings, and in the field of long rod steel forgings, which can solve the problem of coarse grain size and the inability to effectively control forging reduction and reprocessing. Crystallization temperature and other issues, to achieve the effect of reducing the number of forging fires, improving the surface quality and increasing production efficiency

Pending Publication Date: 2021-07-27
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, even if the forging manufacturers with radial precision forging machines with frequency conversion function only use precision forging machine forging, the forging only uses one forging frequency (generally 180 frequency), which cannot effectively control the reduction and recrystallization temperature of forgings. etc., resulting in coarse grain size of long bar steel forgings, the grain size of stainless steel forgings is generally 3-5, and the grain size of combined steel forgings is generally 4-6

Method used

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  • Forging method for refining grain size of long-bar-type steel forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: steel type: 022Cr22Ni5Mo3N; bad forging material: Φ660mm electroslag ingot, weighing 3.95 tons; finished forging size: Φ230mm*9500mm.

[0014] The present invention utilizes the frequency conversion forging of radial precision forging machine The specific implementation steps are:

[0015] Step 1), heating in a heating furnace, the temperature of the furnace is 1180°C, and the temperature is kept for 8 hours;

[0016] Step 2), precision forging machine to Φ560mm: use R280 hammer head, 180 frequency forging, forging deformation process: Φ660mm-Φ640mm-Φ600mm-Φ560mm;

[0017] Step 3), precision forging machine to Φ340mm: use R280 hammer, 60 frequency forging, forging deformation process: Φ560mm-Φ490mm-Φ410mm-Φ340mm, use 60 frequency forging.

[0018] Step 4), heating in a heating furnace, the temperature of the furnace is 1180°C, and the temperature is kept for 1.5 hours;

[0019] Step 5), replace the R280 hammer head with the R150 hammer head;

[0020] Step ...

Embodiment 2

[0024] Example 2: steel type: 1Cr18Ni9Ti; forging billet: large head diameter Φ666mm, small head diameter Φ618mm, ingot weight 3.6 tons; finished forging size: Φ260mm*6540mm.

[0025] The present invention utilizes the frequency conversion forging of radial precision forging machine The specific implementation steps are:

[0026] Step 1), heating in a heating furnace, the temperature of the furnace is 1150°C, and the temperature is kept for 8 hours;

[0027] Step 2), precision forging machine to Φ520mm; use R280 hammer, 180 frequency forging, forging deformation process: Φ666mm-Φ620mm-Φ570mm-Φ520mm;

[0028] Step 3), precision forging machine to Φ360mm; use R280 hammer, 60 frequency forging, forging deformation process: Φ520mm-Φ440mm-Φ360mm;

[0029] Step 4), heating in a heating furnace, the temperature of the furnace is 1100°C, and the temperature is kept for 1.0 hour;

[0030] Step 5), replace the R280 hammer head with the R180 hammer head;

[0031] Step 6), precision fo...

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Abstract

The invention relates to a forging method for refining a grain size of a long-bar-type steel forge piece. The method comprises the following steps that 1) a steel ingot or an electroslag ingot is directly forged by using a radial precision forging machine, the forge piece is forged to enable a diameter of the forge piece to be 340 mm to 560 mm by using frequency of 180 or 240 and reduction of 40 mm to 60 mm per pass, and 3 passes to 5 passes of deformation is reserved for forging at frequency of 60 or 90; 2) the forge piece is forged to enable the diameter of the forge piece to be a diameter of a finished forge piece plus 30 mm to 100 mm by using frequency of 60 or 90 and reduction of 70 mm to 100 mm per pass, and 1 pass to 2 passes of deformation is reserved for finishing forging at frequency of 180 or 240; and 3) the grain size of the long-bar-type steel forge piece is effectively refined and surface quality of the forge piece is obviously improved by using frequency of 180 or 240 and reduction of 30 mm to 50 mm per pass.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging method for refining the grain size of long rod-like steel forgings by using a radial precision forging machine for frequency conversion forging. Long rod steel forgings with high requirements on grain size. Background technique [0002] At present, long rod steel forgings usually adopt the joint forging method of hydraulic press blank forging and finishing forging machine forging. This forging method will not only lead to long rod steel forgings crystallization due to factors such as many forging times and difficulty in controlling the final forging temperature. Coarse particle size will lead to high forging cost, low production efficiency and poor surface quality. The radial precision forging machine with frequency conversion forging function has frequency conversion power of 60, 90, 180, 240, 60 frequency means forging 60 times per minute; 90 frequency me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00
CPCB21J5/008
Inventor 李占华高全德雷冲张凯亮王欢王金宝孙振环郑安雄曲晓赵东
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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