CN109652626A - High-speed steel roll afterheat in casting heat treatment method - Google Patents
High-speed steel roll afterheat in casting heat treatment method Download PDFInfo
- Publication number
- CN109652626A CN109652626A CN201910040447.4A CN201910040447A CN109652626A CN 109652626 A CN109652626 A CN 109652626A CN 201910040447 A CN201910040447 A CN 201910040447A CN 109652626 A CN109652626 A CN 109652626A
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- Prior art keywords
- heat treatment
- speed steel
- roll
- casting
- steel roll
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses high-speed steel roll afterheat in casting heat treatment methods, comprising the following steps: S1: unpacking, high-speed steel roll after centrifugal casting, unpack by the Shake-out Time being calculated from the formula after crystallization and freezing is cooling in casting mold；The formula are as follows: the time=coefficient × roll casting diameter of unpacking, unit: when m- h, diameter-dm；S2: quenching, and samming is kept the temperature after rear speed is rapidly heated for a period of time in high-speed steel roll resistance furnace, comes out of the stove air-cooled；S3: tempering.The present invention is by calculating Shake-out Time through the resulting formula of a large number of experiments, more traditional cold unpacking roll can save energy 50% or more in heat treatment link, and shorten the manufacturing cost of heat treatment cycle and roll, it is high to handle the roll hardness obtained, and crystal grain is tiny, carbide greatly reduces the energy and time loss of heat treatment link without agglomeration phenomenon, function admirable.
Description
Technical field
The present invention relates to field of metallurgy more particularly to high-speed steel roll afterheat in casting heat treatment methods.
Background technique
Prior heat treatment is that metal material is placed on to certain heating equipment, and heating, heat preservation, cooling, lead in certain medium
The crystal phase institutional framework for changing material surface or inside is crossed, to change a kind of metal heat processing technique of its performance.Current biography
Heat treatment process of uniting often huge energy consumption, also will use a large amount of cooling water and quenching medium, pollute environment, it is therefore necessary to set
It counts a kind of without using cooling water and quenching medium, energy saving heat treatment method.
Summary of the invention
The object of the present invention is to provide high-speed steel roll afterheat in casting heat treatment methods.
Realizing the technical solution of the object of the invention is: high-speed steel roll afterheat in casting heat treatment method, comprising the following steps:
S1: unpacking, and high-speed steel roll calculates after crystallization and freezing is cooling in casting mold according to formula after centrifugal casting
Shake-out Time out is unpacked, the formula are as follows: the time (h)=coefficient × roll casting diameter (dm) of unpacking.
S2: quenching, and samming is kept the temperature after rear speed is rapidly heated for a period of time in high-speed steel roll resistance furnace, comes out of the stove air-cooled.
S3: tempering.
In the S1, coefficient of unpacking is 1.2~1.4.
In the S2, equal temperature time is 6~8 hours.
It in the S2, is rapidly heated and 1050~1080 DEG C/h is warming up to 50~80 DEG C/h, heat preservation is come out of the stove after 6~8 hours
Air-blast quenching is to 400~450 DEG C.
In the S3, tempering temperature is 500~550 DEG C, and soaking time is 48~60 hours.
Using above-mentioned technical proposal, the present invention has the following beneficial effects: (1) present invention is by through a large number of experiments institute
The formula obtained calculates Shake-out Time, and more traditional cold unpacking roll can save energy 50% or more in heat treatment link, and shorten
The manufacturing cost of heat treatment cycle and roll, the roll hardness for handling acquisition is high, and crystal grain is tiny, and carbide is without agglomeration
Phenomenon, function admirable greatly reduce the energy and time loss of heat treatment link.
(2) the not applicable water of the present invention or oil are used as coolant and quenching medium, economical environment-protective, while handling the roll of acquisition
It meets the requirements, greatly reduces cost, it is more environmentally protective.
Detailed description of the invention
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail, wherein
Fig. 1 is the metallographic microscope of the embodiment of the present invention 1.
Specific embodiment
(embodiment 1)
One diameter 380mm of the present embodiment centrifugal casting, length 650mm high-speed steel roll, when calculating unpacking according to formula
Between: T=1.3 × 3.8=4.94 hours, practical Shake-out Time was to carry out within 03 minutes 5 hours unpacking, the roller surface of going out of unpacking
Temperature is 803 DEG C, and for surface inspection without casting flaw, the high temperature roll of unpacking moves into rapidly samming 6 in box trolley resistance furnace
Hour after with 80 DEG C/h heating rate be rapidly heated to 1050 DEG C keep the temperature 8 hours after, air blast quenching of coming out of the stove to 400 DEG C, want by technique
The roll hardness asked is 83-85HSD, and determining tempering temperature is 530 ± 5 DEG C of progress temperings, heat preservation according to the technological requirements
Time is 48 hours, and it is 84HSD that hardness determination is carried out after coming out and cooling down, and meets technique requirement.
The prior heat treatment electricity consumption relative energy-saving 53% of the high-speed steel roll of the heat treatment process and same size, and pass through
Metallographic detection crystal grain is tiny, carbide dispersion distribution.
(embodiment 2)
When one diameter 500mm of the present embodiment centrifugal casting, length 1500mm high-speed steel roll, opened according to formula calculating
The case time: T=1.2 × 5=6 hours, practical Shake-out Time was to carry out within 20 minutes 6 hours unpacking, the roller surface temperature of going out of unpacking
Degree is 828 DEG C, and for surface inspection without casting flaw, it is small that the high temperature roll of unpacking moves into rapidly samming 7 in box trolley resistance furnace
When after be rapidly heated with 70 DEG C/h heating rate and keep the temperature 7 hours to 1060 DEG C after, air blast quenching of coming out of the stove is to 432 DEG C, technique requirement
Roll hardness be 85-88HSD, determining tempering temperature is 505 ± 5 DEG C of progress temperings according to the technological requirements, when heat preservation
Between be 58 hours, after coming out and cooling down carry out hardness determination be 86HSD, meet technique requirement.
The prior heat treatment electricity consumption relative energy-saving 56% of the high-speed steel roll of the heat treatment process and same size, and pass through
Metallographic detection crystal grain is tiny, and carbide is without agglomeration phenomenon.
(embodiment 3)
When one diameter 700mm of centrifugal casting, length 1700mm high-speed steel roll, Shake-out Time: T is calculated according to formula
=1.4 × 7=9.8 hours, practical Shake-out Time was to carry out within 30 minutes 9 hours unpacking, and the roller surface temperature of unpacking is
842 DEG C, without casting flaw, the high temperature roll of unpacking moves into rapidly in box trolley resistance furnace after samming 8 hours surface inspection
It is rapidly heated after keeping the temperature 6 hours to 1080 DEG C with 50 DEG C/h heating rate, to 450 DEG C, what technique required rolls air blast quenching of coming out of the stove
Roller hardness is 83-85HSD, and determining tempering temperature is 540 ± 5 DEG C of progress temperings according to the technological requirements, and soaking time is
60 hours, it was 85HSD that hardness determination is carried out after coming out and cooling down, and met technique requirement.
The prior heat treatment electricity consumption relative energy-saving 57% of the high-speed steel roll of the heat treatment process and same size, and pass through
Metallographic detection crystal grain is tiny, carbide dispersion distribution.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention,
All within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in of the invention
Within protection scope.
Claims (5)
1. high-speed steel roll afterheat in casting heat treatment method, it is characterised in that the following steps are included:
S1: unpacking, and high-speed steel roll is calculated from the formula after crystallization and freezing is cooling in casting mold after centrifugal casting
Shake-out Time is unpacked；The formula are as follows: the time=coefficient × roll casting diameter of unpacking, unit: when m- h, diameter-dm；
S2: quenching, and samming is kept the temperature after rear speed is rapidly heated for a period of time in high-speed steel roll resistance furnace, comes out of the stove air-cooled；
S3: tempering.
2. high-speed steel roll afterheat in casting heat treatment method according to claim 1, it is characterised in that: in the S1, open
Case coefficient is 1.2~1.4.
3. high-speed steel roll afterheat in casting heat treatment method according to claim 1, it is characterised in that: in the S2,
The warm time is 6~8 hours.
4. high-speed steel roll afterheat in casting heat treatment method according to claim 1, it is characterised in that: in the S2, fastly
Speed heating is warming up to 1050~1080 DEG C/h with 50~80 DEG C/h, and heat preservation came out of the stove air-blast quenching to 400-450 DEG C after 6~8 hours.
5. high-speed steel roll afterheat in casting heat treatment method according to claim 1, it is characterised in that: in the S3, return
Fiery temperature is 500~550 DEG C, and soaking time is 48~60 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910040447.4A CN109652626A (en) | 2019-01-16 | 2019-01-16 | High-speed steel roll afterheat in casting heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910040447.4A CN109652626A (en) | 2019-01-16 | 2019-01-16 | High-speed steel roll afterheat in casting heat treatment method |
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| CN201910040447.4A Pending CN109652626A (en) | 2019-01-16 | 2019-01-16 | High-speed steel roll afterheat in casting heat treatment method |
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Citations (9)
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|---|---|---|---|---|
| JPH06336615A (en) * | 1993-05-27 | 1994-12-06 | Kubota Corp | Method for heat-treating high-speed steel series composite roll |
| JP2003039106A (en) * | 2001-07-27 | 2003-02-12 | Nippon Steel Corp | Method for manufacturing compound workroll for cold rolling and workroll |
| CN101974723A (en) * | 2010-09-26 | 2011-02-16 | 中钢集团邢台机械轧辊有限公司 | Impact-resistance double-roller roughing roll and manufacturing method thereof |
| CN104152789A (en) * | 2014-08-06 | 2014-11-19 | 江苏大学 | Preparation method of wear-resistant ductile cast iron ball mill lining board quenched by residual heat |
| CN104191173A (en) * | 2014-08-19 | 2014-12-10 | 常州凯达重工科技有限公司 | Roller producing technology for high-end rail rolling mill |
| CN104525889A (en) * | 2014-12-31 | 2015-04-22 | 中钢集团邢台机械轧辊有限公司 | High-speed steel roller manufacturing method |
| CN105316565A (en) * | 2015-11-26 | 2016-02-10 | 常州凯达重工科技有限公司 | High-strength low-hardness ferritic nodular cast iron roller ring and manufacturing method thereof |
| CN106756617A (en) * | 2016-12-29 | 2017-05-31 | 常州凯达重工科技有限公司 | A kind of high rigidity graphitic steel shaped roll and preparation method thereof |
| CN108624800A (en) * | 2018-05-11 | 2018-10-09 | 铜陵市大明玛钢有限责任公司 | A kind of chromium-copper abrading-ball production technology |
-
2019
- 2019-01-16 CN CN201910040447.4A patent/CN109652626A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06336615A (en) * | 1993-05-27 | 1994-12-06 | Kubota Corp | Method for heat-treating high-speed steel series composite roll |
| JP2003039106A (en) * | 2001-07-27 | 2003-02-12 | Nippon Steel Corp | Method for manufacturing compound workroll for cold rolling and workroll |
| CN101974723A (en) * | 2010-09-26 | 2011-02-16 | 中钢集团邢台机械轧辊有限公司 | Impact-resistance double-roller roughing roll and manufacturing method thereof |
| CN104152789A (en) * | 2014-08-06 | 2014-11-19 | 江苏大学 | Preparation method of wear-resistant ductile cast iron ball mill lining board quenched by residual heat |
| CN104191173A (en) * | 2014-08-19 | 2014-12-10 | 常州凯达重工科技有限公司 | Roller producing technology for high-end rail rolling mill |
| CN104525889A (en) * | 2014-12-31 | 2015-04-22 | 中钢集团邢台机械轧辊有限公司 | High-speed steel roller manufacturing method |
| CN105316565A (en) * | 2015-11-26 | 2016-02-10 | 常州凯达重工科技有限公司 | High-strength low-hardness ferritic nodular cast iron roller ring and manufacturing method thereof |
| CN106756617A (en) * | 2016-12-29 | 2017-05-31 | 常州凯达重工科技有限公司 | A kind of high rigidity graphitic steel shaped roll and preparation method thereof |
| CN108624800A (en) * | 2018-05-11 | 2018-10-09 | 铜陵市大明玛钢有限责任公司 | A kind of chromium-copper abrading-ball production technology |
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