CN109593945B - Self-tempering high-frequency strengthening method for roll neck or support shoulder of roll - Google Patents
Self-tempering high-frequency strengthening method for roll neck or support shoulder of roll Download PDFInfo
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- CN109593945B CN109593945B CN201811534589.8A CN201811534589A CN109593945B CN 109593945 B CN109593945 B CN 109593945B CN 201811534589 A CN201811534589 A CN 201811534589A CN 109593945 B CN109593945 B CN 109593945B
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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
- 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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- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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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
- C21D2221/00—Treating localised areas of an article
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a self-tempering high-frequency strengthening method for a roll neck or a support shoulder of a roll, which comprises the following steps: s1, placing the roller on a mechanical device, and arranging the roller neck or the supporting shoulder corresponding to the coil of the high-frequency induction heating device; s2, axially moving the roller to enable the coil to be sleeved at the root of the roller neck or the supporting shoulder to be strengthened; s3, driving the roller to rotate and starting the high-frequency induction heating device, and when the temperature is lower than the set temperature of the initial heating section by 10-20 ℃, enabling the coil to move from one end of the root of the roller neck or the support shoulder to the other end, and controlling the heating temperature of the initial heating section and the tail end heating section to be lower than the heating temperature of the middle heating section; s4, cooling to room temperature after heating. The invention can temper the cooled part due to the action of heat conduction through the skin effect of the heating of the high-frequency induction heating device and the axial gradual movement of the roller during the heating, thereby realizing the self-tempering treatment, further realizing the control on the hardness of the roller neck or the shoulder support and meeting the hardness requirement of the roller neck or the shoulder support.
Description
Technical Field
The invention relates to the technical field of roller heat treatment, in particular to a self-tempering high-frequency strengthening method for a roller neck or a supporting shoulder of a roller.
Background
In the prior art, a process mode of high-frequency induction heating and medium-temperature tempering in a resistance furnace is generally adopted for heat treatment of a roll neck or a support shoulder of a roll, and specifically, the high-frequency induction heating is carried out on the roll one by one, the roll is cooled to room temperature in air, and then a plurality of rolls are tempered by collectively using the resistance furnace. The above-mentioned method can make the roll neck obtain the required hardness, but it has several disadvantages as follows.
1. High austenitizing heating temperature is needed during high-frequency induction heating, a high-hardness full martensite structure can be obtained after air cooling, and once induction heating equipment fails, the induction heating equipment needs to be reheated, so that cracks are easily generated;
2. the existing process mode is not beneficial to flexible production, because the proportion of the rollers with high hardness requirements in all products is often not too large, and because of different delivery periods, the rollers with high hardness requirements cannot be intensively arranged for production, the charging amount of the resistance furnace during tempering is small, and the heat treatment cost is increased.
3. The production period is long, generally, the medium-temperature tempering needs about 24 hours, and then the product can be cooled to the room temperature within 1 day, meanwhile, the roll body of the roller after the medium-temperature tempering is oxidized, the roll body quenching of the subsequent process cannot be directly carried out, and the semi-finish turning process of the roll body needs 1 day, so that the product after the induction heating needs 3 days to enter the subsequent roll body quenching process, and the production efficiency is seriously influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a self-tempering high-frequency strengthening method for roll necks or support shoulders, which is intended to overcome at least one of the disadvantages of the prior art and provide a low-cost and efficient heat treatment method for roll necks or support shoulders.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a self-tempering high frequency strengthening method for a roll neck or a supporting shoulder, comprising the following steps:
s1, placing the roller on a mechanical device which can drive the roller to rotate and drive the roller to axially move, and arranging one end of a neck or a support shoulder of the roller to be strengthened corresponding to a coil of the high-frequency induction heating device;
s2, axially moving the roller to enable the coil of the high-frequency induction heating device to be sleeved at the root of the roller neck or the supporting shoulder to be strengthened;
s3, driving the roller to rotate, starting the high-frequency induction heating device, driving the roller to axially move at a set speed value after the heating temperature reaches a temperature value 10-20 ℃ lower than the set temperature of the initial heating section, so that the coil of the high-frequency induction heating device moves from one end of the root of the roller neck or the support shoulder to the other end of the roller neck or the support shoulder, and controlling the heating temperatures of the initial heating section and the tail end heating section of the high-frequency induction heating device to be lower than the heating temperature of the middle heating section;
s4, after the heating length is set, the high-frequency induction heating device is stopped, and the heated roll neck or support shoulder is cooled to room temperature by air.
Further, the frequency of the high-frequency induction heating device is 100-.
Furthermore, the coil of the high-frequency induction heating device is a single coil, the coil is made of a square copper pipe, and cooling water is circulated in the coil in a circulating manner.
Furthermore, the gap between the outer circumferential surface of the roll neck or the support shoulder and the inner circumferential surface of the coil is 3-10 mm.
Further, when the heating is started, the distance between the coil of the high-frequency induction heating device positioned at one end of the root of the roll neck or the shoulder support and the side surface of the adjacent roll neck end or the side surface of the shoulder support end is 3-8 mm.
Further, the heating temperature of the high-frequency induction heating device is set to obtain a set process temperature within 2mm of the depth of a roll neck or a support shoulder to be strengthened, and the heating temperature of the high-frequency induction heating device is not more than 930 ℃.
Further, the set speed value is 15-35 mm/min.
Further, the rotating speed of the roller is 20-40 rpm.
Further, the length of the initial heating section and the length of the terminal heating section are 20-30 mm.
Further, the heating temperature of the intermediate heating section is 820-930 ℃, and the heating temperature of the initial heating section and the heating temperature of the terminal heating section are 20-50 ℃ lower than the heating temperature of the intermediate heating section.
Compared with the prior art, the self-tempering high-frequency strengthening method for the roll neck or the support shoulder of the roller has the following advantages:
in the strengthening method, the cooled part can be tempered due to the action of heat conduction through the skin effect of heating of the high-frequency induction heating device and the axial progressive movement of the roller during heating, so that the self-tempering treatment can be realized, the hardness of the roller neck or the support shoulder can be further controlled, and the hardness of the roller neck or the support shoulder can reach 50-70HSD so as to meet the hardness requirement of the roller neck or the support shoulder.
Meanwhile, compared with the traditional process mode of medium temperature tempering by induction heating and resistance furnace, the process of the invention can reduce the power consumption and the cost by self-tempering without medium temperature tempering, and can also shorten the production period and improve the production efficiency.
In addition, in the strengthening method, a 200KHZ high-frequency induction heating device is adopted, so that a hardened layer of 1-1.5mm can be obtained after the roll neck or the supporting shoulder is strengthened, and the hardness requirement is met. And the set process temperature is ensured within 2mm of the depth of the roll neck or the support shoulder, so that high-frequency heating in two phase regions of the roll neck or the support shoulder material can be ensured, and once the induction heating equipment fails and needs repeated heating, cracks are not easy to generate, and the integral quality of the roll cannot be influenced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a roll neck of a roll according to an embodiment of the present invention;
description of reference numerals:
100-rolling;
101-roll neck, 102-end flank;
200-a coil;
300-mechanical device, 301-riding wheel.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment relates to a self-tempering high-frequency strengthening method for a roll neck or a support shoulder, which is suitable for strengthening treatment of the roll neck or the support shoulder of various forged steel rolls so as to ensure that the roll neck or the support shoulder has the hardness meeting the requirement. In particular, taking a roll neck as an example, and referring to fig. 1, the strengthening method comprises the following steps. In fig. 1, after the step s2 described below is performed, the roll neck 101 of the roll 100 and the coil 200 of the high-frequency induction heating apparatus are in a state.
The specific steps of the high frequency strengthening method of the embodiment are as follows:
step s 1: placing the roller 100 on a mechanical device 300 which can drive the roller 100 to rotate and can drive the roller 100 to axially move, and arranging one end of a roller neck 101 to be strengthened of the roller 200 corresponding to a coil 200 of the high-frequency induction heating device;
step s 2: axially moving the roller 100 to enable a coil 200 of the high-frequency induction heating device to be sleeved at the root of a roller neck 101 to be strengthened;
step s 3: driving the roller 100 to rotate, starting the high-frequency induction heating device, driving the roller 100 to axially move at a set speed value after the heating temperature reaches a temperature value which is 10-20 ℃ lower than the set temperature of the initial heating section, so that the coil 200 of the high-frequency induction heating device moves from one end of the root part of the roll neck 101 to the other end of the roll neck 101, and controlling the heating temperatures of the initial heating section and the tail end heating section of the high-frequency induction heating device to be lower than the heating temperature of the middle heating section;
step s 4: after the setting of the heating length is completed, the high-frequency induction heating apparatus is stopped, and the heated roll neck 101 is air-cooled to room temperature.
In detail, in step s1, the mechanical device 300 for supporting the roll 100 may be implemented by using an existing machine structure, the mechanical device 300 is provided with the supporting rollers 301 respectively disposed on two opposite sides, the roll 100 is placed between the supporting rollers 301 on two sides, and further can be rotatably supported by the supporting rollers 301 on two sides, and meanwhile, the supporting roller 301 on one side can be driven by the motor to rotate, thereby also realizing the rotation of the roll 100.
In addition, for the mechanical device 300 to drive the roller 100 to move axially, the mechanical device 300 can reciprocate in the axial direction of the received roller 100, and in the specific implementation, for example, the traveling wheels at the bottom of the mechanical device 300 move along the track parallel to the axial direction of the roller 100, and the traveling wheels on the mechanical device 300 are also driven by the motor in the mechanical device 300.
In this embodiment, the roll 100 may be specifically configured such that the roll body is semi-finished and then placed on the mechanical device 300, and after the roll 100 is placed on the mechanical device 300, the roll neck 101 to be strengthened on the roll 100 is arranged corresponding to the coil 200 of the high-frequency induction heating device. The coil 200 is disposed corresponding to the coil 200, that is, the coil 200 in the high frequency induction heating device is disposed on the traveling path of the mechanical device 300, and the axis of the roll 100 is preferably coincident with the center line of the coil 200, so that the roll neck 101 of the roll 100 can penetrate into the coil 200 by the movement of the mechanical device 300.
Still referring to fig. 1, in the present embodiment, after the neck 101 of the roll 100 penetrates into the coil 200, the gap K between the outer circumferential surface of the neck 101 and the inner circumferential surface of the coil 200 should be between 3-10mm, and it may be, for example, 3mm, 3.5mm, 4mm, 5mm, 5.6mm, 6mm, 6.4mm, 6.8mm, 7mm, 7.3mm, 8mm, 8.5mm, 9mm, or 10 mm. And corresponding to step s2, after the coil 200 of the high-frequency induction heating apparatus enters the root of the roll neck 101, the present embodiment should also be such that the distance L between the coil 200 and the end side face 102 of the root end of the roll neck 101 at the time of heating initiation is between 3 and 8mm, and it may be, for example, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.4mm, 6.8mm, 7mm, 7.3mm, 7.5mm, or 8 mm.
In addition, the frequency of the high-frequency induction heating device of the present embodiment should be selected to be between 100-200KHz, for example, 200KHz, which is sufficient to ensure that a hardened layer of 1-1.5mm can be obtained at the reinforced portion of the roll neck. The coil 200 of the high-frequency induction heating apparatus is preferably made of a copper pipe having a square cross section, and the coil 200 is designed as a single coil, and cooling water is circulated therein. When the induction heating device is used, the heating temperature is adjusted by controlling the anode voltage of the induction heating device, and the anode voltage value is adjusted between 6 KV and 12KV according to the heating temperature.
In the present embodiment, referring to step s3, specifically, the rotation speed of the roll 100 during the heat strengthening is 20 to 40rpm, which may be 20rpm, 23rpm, 25rpm, 30rpm, 35rpm, 38rpm, or 40rpm, for example. After the high-frequency induction heating device is turned on, the coil 200 is retained at the initial position for a certain time to make the heating temperature meet the requirement, and then the roller 100 is axially moved, and the required temperature can be, for example, 10 ℃, 11 ℃, 12 ℃, 13.5 ℃, 14 ℃, 15 ℃, 16.5 ℃, 17 ℃, 18 ℃, 18.5 ℃, 19 ℃ or 20 ℃ lower than the initial section setting temperature.
Generally, the axial movement speed of the roll 100 driven by the mechanical device 300 is related to the diameter of the roll neck 101 to be strengthened and is determined according to the required heating temperature, and for the roll neck 101 with the diameter of 150-450mm, the axial movement speed of the roll 100 is between 15-35 mm/min. Furthermore, the axial displacement speed is generally kept substantially constant throughout the heating process, but can also be fine-tuned to changes in the heating temperature. After the axial moving speed is determined, the anode voltage of the induction heating device can be controlled to obtain the required heating temperature. As the roll neck 101 moves, the coil 200 of the high frequency induction heating apparatus moves relative to the roll neck 101 from one end of the root of the roll neck 101 to the other end to complete heating of the entire strengthened portion.
In this embodiment, the entire strengthened portion of the roll neck 101 may be formed by three sections Q + C + M from the root of the roll neck 101 as shown in fig. 1, and the initial heating section, the terminal heating section and the intermediate heating section in the step s3 correspond to the sections Q, M and C, respectively.
In addition to the sectional temperature control of the Q section, the M section and the C section, the heating temperature of the high frequency induction heating apparatus according to the present embodiment is set as the basis of the heating temperature setting of the high frequency induction heating apparatus, and the heating temperature of the high frequency induction heating apparatus should satisfy the set process temperature within the depth of 2mm of the roll neck 101, and the heating temperature of the high frequency induction heating apparatus should not exceed 930 ℃. The set process temperature can be determined according to the material of the roll 100 and the diameter of the roll neck 101, so as to ensure that the two-phase zone heating of the material of the roll neck 101 is possible. The selection of the heating temperature can ensure that the roll neck 101 is not easy to generate cracks when repeated heating is carried out, thereby avoiding the quality problem of the roll neck 101.
The roll neck 101 after the heating of this embodiment can rely on its body that is not heated to cool off rapidly, through above-mentioned three-section heating temperature control, the characteristics that usable beginning heating section (Q section) and terminal heating section (M section) body cooling capacity are strong guarantee the homogeneity of roll neck 101 intensive hardness. At the same time, in accordance with the progressive axial movement of the roll 100, the cooled part of the roll neck 101 can be tempered by the heat conduction effect of the part being heated, and the self-tempering effect is also achieved.
In this embodiment, the length of the general initial heating section and the terminal heating section may be 20 to 30mm, and may be, for example, 20mm, 21.5mm, 22mm, 23.5mm, 24mm, 25mm, 26.5mm, 27mm, 28mm, 29mm, or 30 mm. The heating temperature is generally related to the material and diameter of the roll neck, the upper limit temperature for the small diameter and the lower limit temperature for the large diameter, the heating temperature of the intermediate heating section can be adjusted between 820 and 930 ℃ for the roll neck with the diameter range of 150-450mm, and the heating temperatures of the initial heating section and the terminal heating section are 20-50 ℃ lower than the heating temperature of the intermediate heating section, and can be, for example, 20 ℃, 25 ℃, 30 ℃, 33 ℃, 35 ℃, 40 ℃, 42 ℃, 48 ℃ or 50 ℃.
After the set heating length of the roll neck 101 is finished, the air cooling time is generally about 8-10h, after the roll neck is cooled to the room temperature, whether the hardness meets the requirement can be detected, and if the hardness meets the requirement, the subsequent roll body induction quenching process can be directly carried out.
The specific strengthening method of the shoulder rest on the roll 100 of the present embodiment is substantially the same as that of the roll neck 101, and will not be described herein again.
While still taking the strengthening of the roll neck 101 as an example, specific strengthening examples thereof are as follows according to the above-described method.
In this example, the material of the roll neck 101 was Cr5, the cross section of the coil 200 of the high-frequency induction heating apparatus was 15 × 15mm, the gap K was 10mm, the distance L was 5mm, the rotation speed of the roll 100 was 20rpm, the lengths of the Q segment and the M segment were 20mm, and the air cooling time was 8h after completion of heating.
Other requirements and parameters and hardness measurements after cooling are shown in table 1 below.
TABLE 1 other requirements and parameters and test results
As can be seen from the above table, the hardness of the roll neck 101 after the treatment by the self-tempering strengthening method of the present embodiment satisfies the hardness requirement.
Meanwhile, in comparison with the roll neck 101 made of Cr5 in the above embodiment but using the conventional medium temperature tempering method with resistance furnace for induction heating, the inventors have found that the strengthening method of the present embodiment does not require resistance furnace tempering, thereby saving 300KWh per ton of electricity consumed in production, and shortening the production cycle by 2 days compared with the conventional method.
Therefore, the strengthening method of the present embodiment not only can strengthen the neck 101 or the shoulder of the roll 100, but also has many advantages such as low cost and high efficiency, and thus has good practicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A self-tempering high-frequency strengthening method for a roll neck or a supporting shoulder of a roll is characterized in that: the method comprises the following steps:
s1, placing the roller on a mechanical device which can drive the roller to rotate and drive the roller to axially move, and arranging one end of a neck or a support shoulder of the roller to be strengthened corresponding to a coil of the high-frequency induction heating device;
s2, axially moving the roller to enable the coil of the high-frequency induction heating device to be sleeved at the root of the roller neck or the supporting shoulder to be strengthened;
s3, driving the roller to rotate, starting the high-frequency induction heating device, driving the roller to axially move at a set speed value after the heating temperature reaches a temperature value 10-20 ℃ lower than the set temperature of the initial heating section, so that the coil of the high-frequency induction heating device moves from one end of the root of the roller neck or the support shoulder to the other end of the roller neck or the support shoulder, and controlling the heating temperatures of the initial heating section and the tail end heating section of the high-frequency induction heating device to be lower than the heating temperature of the middle heating section;
s4, stopping the high-frequency induction heating device after the heating length is set, and air-cooling the heated roll neck or support shoulder to the room temperature;
wherein the diameter of the roller neck or the support shoulder is 150-450mm, the length of the initial heating section and the terminal heating section is 20-30mm, the heating temperature of the middle heating section is 820-930 ℃, and the heating temperature of the initial heating section and the terminal heating section is 20-50 ℃ lower than that of the middle heating section.
2. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the frequency of the high-frequency induction heating device is 100-200 KHZ.
3. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the coil of the high-frequency induction heating device is a single coil, the coil is made of a square copper pipe, and cooling water is circulated in the coil in a circulating mode.
4. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the gap between the outer circumferential surface of the roll neck or the support shoulder and the inner circumferential surface of the coil is 3-10 mm.
5. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: when heating is started, the distance between the coil of the high-frequency induction heating device positioned at one end of the root of the roll neck or the support shoulder and the side surface of the adjacent roll neck end or the side surface of the support shoulder end is 3-8 mm.
6. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the heating temperature of the high-frequency induction heating device is set to be a set process temperature within 2mm of the depth of a roller neck or a supporting shoulder to be strengthened, and the heating temperature of the high-frequency induction heating device is not more than 930 ℃.
7. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the set speed value is 15-35 mm/min.
8. The self-tempering high frequency strengthening method for a roll neck or back-up shoulder of claim 1, wherein: the speed of the roller rotation is 20-40 rpm.
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| CN201811534589.8A CN109593945B (en) | 2018-12-14 | 2018-12-14 | Self-tempering high-frequency strengthening method for roll neck or support shoulder of roll |
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| CN112695185A (en) * | 2020-12-08 | 2021-04-23 | 中钢集团邢台机械轧辊有限公司 | Roll neck strengthening method for intermediate roll of eighteen-high rolling mill |
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| JP2000297328A (en) * | 1999-04-13 | 2000-10-24 | Nippon Steel Corp | Heat treatment apparatus for build-up welded roll excellent in heat cracking resistance |
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