Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod

A technology of dimensional accuracy and surface quality, applied in temperature control, elongation control, metal rolling, etc., can solve the problems of wire rod dimensional accuracy and surface quality that are difficult to guarantee, so as to save the annealing process, easy to control, and eliminate cracks Effect

Inactive Publication Date: 2011-04-13
武钢集团有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when various iron and steel smelting enterprises use the production and rolling pass system of carbon steel to roll bearing steel wire rods, it is difficult to guarantee the dimensional accuracy and surface quality of the produced wire rods.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod
  • Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A high-carbon chromium bearing steel hot-rolled wire rod with a final forming diameter of 14 mm was prepared by using a Morgan 45° high-speed twist-free finishing mill (10 stands).

[0021] 1) Firstly, the bearing steel continuous casting slab is heated up, and rough rolling, intermediate rolling and pre-finish rolling are carried out in the high-temperature recrystallization zone at 1030°C, so that the cumulative elongation of the rolled piece is n=68.2 times;

[0022] 2) Next, carry out pre-water cooling treatment on the rolled piece, the cooling rate is controlled at 40°C / s, the cooling time is controlled at 0.8s, and finally the temperature of the rolled piece is controlled within the range of 900°C

[0023] 3) Carry out 4 passes of finish rolling, the start temperature of finish rolling is 900°C, and adjust the pass size of the penultimate rolling mill of the finish rolling unit to make it change from diameter Φ 13 The circular hole becomes the minor axi...

Embodiment 2

[0025] Example 2: A high-carbon chromium bearing steel hot-rolled wire rod with a final forming diameter of 5.5 mm was prepared by using the Ashiro 45° high-speed non-twist finishing mill (10 stands).

[0026] 1) First, heat up the continuous casting billet of bearing steel, and carry out rough rolling, intermediate rolling and pre-finish rolling in the high-temperature recrystallization zone at 1130°C, so that the cumulative elongation of the rolled piece n=100 times;

[0027] 2) Next, carry out pre-water cooling treatment on the rolled piece, the cooling rate is controlled at 20°C / s, the cooling time is controlled at 2.2s, and finally the temperature of the rolled piece is controlled within the range of 950°C

[0028] 3) Carry out 10 passes of finish rolling, the start temperature of finish rolling is 950°C, and adjust the pass size of the penultimate rolling mill of the finish rolling unit to make it change from diameter Φ 13 The circular hole becomes the minor axis Φ 23 =...

Embodiment 3

[0030] Example 3: Demark 15° / 75° high-speed twist-free finishing mill (8 stands) was used to prepare a high-carbon chromium bearing steel hot-rolled wire rod with a final forming diameter of 8 mm.

[0031] 1) First, heat up the continuous casting billet of bearing steel, and carry out rough rolling, intermediate rolling and pre-finish rolling in the high-temperature recrystallization zone at 1100°C, so that the cumulative elongation of the rolled piece n=110 times;

[0032] 2) Next, carry out pre-water cooling treatment on the rolled piece, control the cooling rate at 25°C / s, control the cooling time at 1.5s, and finally control the temperature of the rolled piece within the range of 920°C;

[0033] 3) Carry out 6 passes of finish rolling, the start temperature of finish rolling is 920°C, and adjust the pass size of the penultimate rolling mill of the finish rolling unit to make it change from diameter Φ 13 The circular hole becomes the minor axis Φ 23 = Φ 13 , major axis Φ ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for enhancing dimensional accuracy and surface quality of a bearing steel wire rod, comprising the following steps: first heating a bearing steel continuous cast billet, and carrying out crude rolling, intermediate rolling and pre-finish rolling in a high temperature recrystallization zone with temperature being 1030-1130 DEG C; secondly carrying out pre-water cooling treatment on the rolled piece, and finally controlling the temperature of the rolled piece within 900-950 DEG C; then carrying out finish rolling of 4-10 times on the rolled piece, adjusting the hole shape dimension of other round hole type finish roller expect for the last time round hole type finish roller during finish rolling so that the round hole with diameter being theta1 becomes an elliptical hole with the short axis theta2=theta1 and long axis theta3= theta1+0.05-0.30mm, and carrying out finish rolling on the rolled piece; and finally carrying out wind cooling treatment on a scattered roll obtain by finish rolling, controlling the roll collecting temperature of the scattered roll output wind cooling roller channel at 330-450 DEG C, putting in environment air for cooling to normal temperature so as to obtain the high carbon chromium bearing steel hot rolling wire rod. The high carbon chromium bearing steel hot rolling wire rod prepared by using the invention is high in dimension accuracy and good in surface quality.

Description

technical field [0001] The invention relates to the field of production and processing of steel wire rods, in particular to a method for improving the dimensional accuracy and surface quality of bearing steel wire rods. Background technique [0002] High-carbon chromium bearing steel wire rod is an important material for manufacturing bearing rolling bodies. Now users have strict requirements on the dimensional accuracy and surface quality of bearing steel wire rods produced by metallurgical plants, especially for the allowable diameter deviation of wire rods and the incompatibility of wire rods. The roundness is demanding. For example, the national standard "Hot-rolled Wire Rod Dimensions, Shape, Weight and Permissible Deviation" GB / T 14981-2004 stipulates that the dimensional accuracy of wire rods is: Φ5 ~ 10mm wire rod C-level precision diameter allowable deviation ± 0.15mm, C-level precision Diameter out of roundness ≤ 0.24mm (the most stringent requirement), Φ10.5 ~ 15...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/16B21B37/56B21B37/74
Inventor 李拥山陈庆丰周新龙王建明杨友明熊玉彰张贤忠吴卫明许竹桃王志响余爱华曾敏
Owner 武钢集团有限公司