Surface heat treatment process for roller made of EN-9
An EN-9, roll surface technology, applied in the field of heat treatment process of roll surface made of EN-9 material, can solve the problems of poor hardness uniformity of finished products, reduced core toughness, poor accident resistance, etc., and achieves good hardness stability, improved Hardened layer depth, the effect of enhancing the service life
Pending Publication Date: 2022-02-11
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Rolls made of EN-9 material usually adopt overall quenching and tempering, heating to 810-840°C, oil quenching, to meet the required requirements, and the hardness uniformity of the finished product is poor (generally ≥3HSD)
And in order to meet the hardness of the roll body, the hardness of the core is the same as that of the roll body, resulting in a decrease in the toughness of the core, poor accident resistance during use, and a shortened service life
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0017] Embodiment 1: as figure 1 , 2 , 3, the quenching process of the EN-9 roll with the material of Φ510*1400*2289 is used to verify the process results.
[0018] Step 1), before the roll is quenched, the hardness of the quenched and tempered heat treatment reaches 35-45HSD, that is, the overall hardness is 35-45HSD, the preheating temperature is selected as 400±10°C, and the holding time is selected as 16h to ensure that the hardness of the matrix is not changed. When the surface temperature drops less;
[0019] Step 2) After the preheating and heat preservation stage is over, use a 50 / 250HZ dual-frequency quenching machine tool for surface heating and quenching. When quenching, select a heating temperature of 860-870°C, maintain the quenching power at 510±10KW at 50HZ, and maintain the quenching power at 210 at 250HZ ±10KW, the falling speed is 0.8-1.0mm / s, the rotation speed is 35-40r / min, the quenching water pressure is maintained at 0.8-0.9MPa, the total quenching t...
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
Login to View More Abstract
The invention relates to a surface heat treatment process for a roller made of EN-9. The roller is subjected to quenching and tempering heat treatment before quenching, the hardness reaches 35-45 HSD, the preheating temperature is selected to be 350-450 DEG C, the heat preservation time is 12-16 h, after the preheating and heat preservation stage is finished, a 50 / 250 HZ double-frequency quenching machine tool is used for surface heating quenching, the heating temperature is selected to be 860-870 DEG C during quenching, the 50 HZ quenching power is maintained to be 510 + / -10 KW, the 250HZ quenching power is maintained at 210 + / -10KW, the descending speed is 0.8-1.0 mm / s, the rotating speed is 35-40r / min, the quenching water pressure is maintained at 0.8-0.9 MPa, and the total quenching time is 50 + / -5min; after quenching, continuous cooling is performed in a water tank for 80 + / -10min, and then the quenching process is completed; after quenching, the hardness of the roller body is 75-80 HSD, the tempering temperature is selected to be 300 + / -10 DEG C, and tempering is performed to complete the surface heat treatment process; and after heat treatment, the hardness of the roller body reaches 45-50 HSD, the roller quality is better, the hardness uniformity is within 1.5 HSD and is higher than the overall hardening and tempering 3HSD, and the accident resistance is good.
Description
technical field [0001] The invention relates to a roll surface heat treatment process made of EN-9, in particular to a 50HZ / 250HZ dual-frequency quenching equipment to meet the quality requirements of the roll body hardness requirement of 45-50HSD and obtain a hardness uniformity of 1.5 The material within HSD is EN-9 roll surface heat treatment process, which belongs to the field of heat treatment technology. Background technique [0002] The material composition requirements of EN-9 material rolls are: C: 0.50-0.60, Si: ≤0.40, Mn: 0.50-0.80, Cr: ≤0.30, P: ≤0.035, S: ≤0.035, Ni: ≤0.30. The material composition is similar to domestic 55# steel. The rolls of this material are mostly used for rough rolling R1 stands of rolling mills in foreign countries. Domestic R1 rough rolling stands are composite casting rolls, most of which are made of centrifugal casting composite. The requirements of rolling conditions on the thermal cracking resistance, wear resistance and spalling r...
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
Login to View More IPC IPC(8): C21D1/10C21D1/18C21D9/38
CPCC21D1/10C21D1/18C21D9/38Y02P10/25
Inventor 刘培培尚振伟高玉海
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD