CN111004894A - Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel - Google Patents

Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel Download PDF

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Publication number
CN111004894A
CN111004894A CN201911376651.XA CN201911376651A CN111004894A CN 111004894 A CN111004894 A CN 111004894A CN 201911376651 A CN201911376651 A CN 201911376651A CN 111004894 A CN111004894 A CN 111004894A
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China
Prior art keywords
quenching
hardness
heat treatment
raw materials
zone
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CN201911376651.XA
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Chinese (zh)
Inventor
傅世闯
陈庚
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Dalian Demaishi Precision Technology Co ltd
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Dalian Demaishi Precision Technology Co ltd
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Priority to CN201911376651.XA priority Critical patent/CN111004894A/en
Publication of CN111004894A publication Critical patent/CN111004894A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/28Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2261/00Machining or cutting being involved

Abstract

A45 # high-quality carbon structural steel quenching hardness uniform and stable processing technology comprises the steps of (1) smelting raw materials; step (2) rolling, drawing and cutting off; step (3) NC processing; step (4), quenching in a mesh belt furnace; and (5) grinding the excircle. The invention adds Cr with proper content, which can not increase the cost of raw materials, and the chemical component content of the raw materials still meets the standard requirement, and the heat treatment process uses over-speed quenching oil to replace rapid bright quenching oil. Thoroughly solves the problem of uneven hardness and soft spots of the No. 45 steel during heat treatment quenching; the material cost is kept unchanged, the heat treatment qualification rate of the product reaches 100 percent, the production cost is greatly reduced, and the product quality is ensured.

Description

Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel
Technical Field
The invention relates to a uniform and stable quenching hardness processing technology of No. 45 high-quality carbon structural steel, in particular to a processing technology of small-sized shaft parts.
Background
The No. 45 steel is a high-quality carbon structural steel, the hardness of raw materials is not high, the cutting processing is easy, the cost of the raw materials is lower than that of alloy steel, and the raw materials have higher mechanical properties after heat treatment, so the steel is widely applied to automobiles and motorcycles, particularly connecting rods, bolts, gears, shafts and the like under the alternating load work, huge friction force needs to be borne in the work, and the self hardness, the wear resistance, the service life and the like are improved by adopting a quenching mode. However, the 45 steel is a medium carbon steel, the quenching effect is not good, and the 45 steel always generates 'quenching soft spots' in the actual production process, so that the products after heat treatment need to be sorted by hundreds of hardness, and even the scrapping condition of the products in batch due to the hardness problem often occurs. Taking an engine cooling fan motor shaft of phi 8 x 45.9 as an example, the hardness requirement of heat treatment is HRC54 +/-2, and the traditional processing technology is as follows: the defects of the raw materials and the processing process are that the hardness of the product after heat treatment is not uniform, the soft points of the product are more, and hundred percent hardness selection and even scrapping treatment have to be carried out, because the traditional No. 45 steel has low alloy element content (shown in table 1), poor whole hardenability and poor cooling effect of common rapid bright quenching oil, the quenching hardness of the product is not uniform.
Disclosure of Invention
The invention aims to provide a processing technology for the No. 45 high-quality carbon structural steel, which can solve the problems of uneven quenching hardness and soft spots of the No. 45 steel product, reduce the rejection rate of the product and ensure the stable quality of the product and has even and stable quenching hardness.
The processing technology for the No. 45 high-quality carbon structural steel with uniform and stable quenching hardness comprises the following steps:
smelting raw materials: 0.15 to 0.25 percent of Cr element is added during the smelting of No. 45 raw material;
step (2) rolling, drawing and cutting: cutting off the material by a cutting machine after the disc material is drawn;
step (3), NC processing: turning by using a chicken numerical control machine, and then rolling patterns by using a thread rolling machine;
step (4) mesh belt furnace quenching: in the mesh belt furnace quenching process, the quenching process adopts high-temperature quenching, the heating and heat preservation time is 45-60 minutes, the temperature of the mesh belt furnace is set to be 840 ℃ in a first zone, 860 ℃ in a second zone, 860 ℃ in a third zone and 860 ℃ in a fourth zone, and overspeed quenching oil is used for replacing common quick bright quenching oil in the quenching and cooling process;
cylindrical grinding in step (5): and (4) grinding the outer diameter by using a centerless grinder.
Compared with the prior art, the invention has the following advantages:
(1) the proper content of Cr element is added, the cost of raw materials is not increased, the chemical component content of the raw materials still meets the standard requirement, and the rapid bright quenching oil is replaced by the overspeed quenching oil in the heat treatment process.
(2) Thoroughly solves the problem of uneven hardness and soft spots of the No. 45 steel during heat treatment quenching; the material cost is kept unchanged, the heat treatment qualification rate of the product reaches 100 percent, the production cost is greatly reduced, and the product quality is ensured.
Detailed Description
Example 1
The processing technology for the No. 45 high-quality carbon structural steel with uniform and stable quenching hardness comprises the following steps:
smelting raw materials: 0.22 percent of Cr element is added during smelting of No. 45 raw material;
step (2) rolling, drawing and cutting: cutting off the material by a cutting machine after the disc material is drawn;
step (3), NC processing: turning by using a chicken numerical control machine, and then rolling patterns by using a thread rolling machine;
step (4) mesh belt furnace quenching: in the mesh belt furnace quenching process, the quenching process adopts high-temperature quenching, the heating and heat preservation time is 45-60 minutes, the temperature of the mesh belt furnace is set to be 840 ℃ in a first zone, 860 ℃ in a second zone, 860 ℃ in a third zone and 860 ℃ in a fourth zone, and overspeed quenching oil is used for replacing common quick bright quenching oil in the quenching and cooling process;
cylindrical grinding in step (5): and (4) grinding the outer diameter by using a centerless grinder.
A processing technology for the No. 45 high-quality carbon structural steel with uniform and stable quenching hardness takes the processing of a No. 45 steel engine cooling fan motor shaft with phi 8 x 45.9 as an example,
the chemical components of the raw materials of the motor shaft of the original conventional 45# steel engine cooling fan are shown in the table 1, and the hardness values after heat treatment are shown in the table 2:
TABLE 1 phi 8.0 engine cooling fan motor shaft stock composition
Element(s) C Mn Si P S Cr Ni Cu
Standard ingredients 0.42 0.5 0.17
0.50 0.8 0.37 0.035 0.035 0.25 0.30 0.25
Actual measurement result 0.46 0.58 0.22 0.013 0.005 0.082 0.011 0.013
TABLE 2 hardness values after heat treatment (requirement: HRC 54. + -. 2)
As shown in the table, the hardness values of all parts of the product processed by the conventional 45# steel raw material are very uneven after the product is subjected to heat treatment by using common quick bright quenching oil, the number of soft points on the product is large, the qualification rate is extremely low, and the product requirements of customers cannot be met.
After processing using this example, 45# raw material chemistry and post heat treatment hardness values are shown in tables 3 and 4:
TABLE 3 raw material composition of motor shaft of cooling fan for engine phi 8.0
TABLE 4 hardness values after heat treatment (requirement: HRC 54. + -. 2)
According to the hardness test results, the hardness value of the product after heat treatment has no soft point by using the processing mode of the method, and the measured hardness value meets the technical requirements.

Claims (1)

1. A processing technology for uniformly and stably quenching hardness of No. 45 high-quality carbon structural steel is characterized by comprising the following steps of:
smelting raw materials: 0.15 to 0.25 percent of Cr element is added during the smelting of No. 45 raw material;
step (2) rolling, drawing and cutting: cutting off the material by a cutting machine after the disc material is drawn;
step (3), NC processing: turning by using a chicken numerical control machine, and then rolling patterns by using a thread rolling machine;
step (4) mesh belt furnace quenching: in the mesh belt furnace quenching process, the quenching process adopts high-temperature quenching, the heating and heat preservation time is 45-60 minutes, the temperature of the mesh belt furnace is set to be 840 ℃ in a first zone, 860 ℃ in a second zone, 860 ℃ in a third zone and 860 ℃ in a fourth zone, and overspeed quenching oil is used for replacing common quick bright quenching oil in the quenching and cooling process;
cylindrical grinding in step (5): and (4) grinding the outer diameter by using a centerless grinder.
CN201911376651.XA 2019-12-27 2019-12-27 Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel Withdrawn CN111004894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911376651.XA CN111004894A (en) 2019-12-27 2019-12-27 Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911376651.XA CN111004894A (en) 2019-12-27 2019-12-27 Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel

Publications (1)

Publication Number Publication Date
CN111004894A true CN111004894A (en) 2020-04-14

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CN201911376651.XA Withdrawn CN111004894A (en) 2019-12-27 2019-12-27 Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103894789A (en) * 2012-12-28 2014-07-02 大连瓦特重机床有限公司 Machine tool spindle machining method
CN104404233A (en) * 2014-12-05 2015-03-11 衡阳风顺车桥有限公司 Quenching method of No. 45 steel sleeve part
CN105648181A (en) * 2014-12-04 2016-06-08 重庆聆益机械有限公司 Heat treatment process for No.45 steel axle
CN105714027A (en) * 2014-12-04 2016-06-29 重庆聆益机械有限公司 Heat treatment process for hardening and tempering of 45 steel
CN107779557A (en) * 2016-08-24 2018-03-09 王玲玲 A kind of 45 Heat-Treatment of Steel techniques of axle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103894789A (en) * 2012-12-28 2014-07-02 大连瓦特重机床有限公司 Machine tool spindle machining method
CN105648181A (en) * 2014-12-04 2016-06-08 重庆聆益机械有限公司 Heat treatment process for No.45 steel axle
CN105714027A (en) * 2014-12-04 2016-06-29 重庆聆益机械有限公司 Heat treatment process for hardening and tempering of 45 steel
CN104404233A (en) * 2014-12-05 2015-03-11 衡阳风顺车桥有限公司 Quenching method of No. 45 steel sleeve part
CN107779557A (en) * 2016-08-24 2018-03-09 王玲玲 A kind of 45 Heat-Treatment of Steel techniques of axle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王晓伟: "45 钢阶梯轴热处理工艺设计探析", 《濮阳职业技术学院学报》 *
邹文立: "浅谈淬火油的选择及常见问题处理", 《石油商技》 *

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