CN111041164B - Heat treatment repairing method for roller type die - Google Patents
Heat treatment repairing method for roller type die Download PDFInfo
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- CN111041164B CN111041164B CN201911358706.4A CN201911358706A CN111041164B CN 111041164 B CN111041164 B CN 111041164B CN 201911358706 A CN201911358706 A CN 201911358706A CN 111041164 B CN111041164 B CN 111041164B
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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
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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
- C21D1/26—Methods of annealing
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention provides a heat treatment repairing method of a roller-shaped mould, which comprises the following steps of S1, carrying out primary quenching treatment on the roller-shaped mould at room temperature; step S2, annealing treatment is carried out after primary quenching treatment; step S3, carrying out secondary quenching treatment on the annealed roller-shaped die; step S4, carrying out primary tempering treatment on the roller-shaped die after the secondary quenching treatment; step S5, rapidly cooling the roller-shaped mould from the first tempering temperature to the critical temperature; step S6, carrying out quenching treatment for three times on the roller-shaped die at the critical temperature; step S7, carrying out secondary tempering treatment on the roller-shaped die after the tertiary quenching treatment; step S8, cooling the roller-shaped die from the second tempering temperature to a preset temperature; and step S9, cooling the roll type mold at the preset temperature to room temperature. The invention solves the problem that in the long-term use process of the roller-shaped die in the prior art, the wear loss of the hole wall of the mounting hole of the rotating shaft is scrapped after reaching the preset value, and the service life of the roller-shaped die is shortened.
Description
Technical Field
The invention relates to the technical field of die repair, in particular to a heat treatment repair method of a roller-shaped die.
Background
In the prior art, a roller-type die is used for rolling a roller-type die base material to form a rim, and the roller-type die is connected with a rotating shaft through a rotating shaft mounting hole on the roller-type die, so that in the long-term use process, the friction between the wall surface of the rotating shaft mounting hole and the inner wall surface of the rotating shaft leads to the increase of the hole wall abrasion loss of the rotating shaft mounting hole, thereby leading to the increase of the gap between the rotating shaft mounting hole of the roller-type die and the rotating shaft, reducing the coaxiality of the roller-type die and the rotating shaft, leading to the disqualification of the rim rolled out by the roller-type die and causing the waste of materials.
Disclosure of Invention
The invention mainly aims to provide a heat treatment repairing method of a roller-shaped die, which aims to solve the problems that in the long-term use process of the roller-shaped die in the prior art, the wear loss of the hole wall of a rotating shaft mounting hole is scrapped after reaching a preset value, and the service life of the roller-shaped die is shortened.
In order to achieve the above object, the present invention provides a heat treatment repairing method of a roller type mold for compensating for a hole wall abrasion amount of a rotating shaft mounting hole of the roller type mold, comprising a step S1 of performing a quenching process on the roller type mold at room temperature to heat the roller type mold to a first quenching temperature; step S2, annealing the roller mold after the primary quenching treatment until the hardness of the roller mold is restored to the original room temperature hardness of the roller mold base material for processing and manufacturing the roller mold; step S3, carrying out secondary quenching treatment on the roller-shaped die after annealing treatment in the furnace so as to heat the roller-shaped die to a second quenching temperature; step S4, carrying out primary tempering treatment on the roller-shaped mould after the secondary quenching treatment until the temperature of the roller-shaped mould is reduced to a first tempering temperature, and keeping the roller-shaped mould at the first tempering temperature for a first time; step S5, rapidly cooling the roller-shaped mould from the first tempering temperature to the critical temperature by using a refrigerant; step S6, carrying out quenching treatment for three times on the roller-shaped die rapidly cooled to the critical temperature so as to heat the roller-shaped die to a third quenching temperature; step S7, carrying out secondary tempering treatment on the roller-shaped die after the tertiary quenching treatment until the temperature of the roller-shaped die is reduced to a second tempering temperature, and keeping the roller-shaped die at the second tempering temperature for a second time; step S8, naturally cooling the roller-shaped mould from the second tempering temperature to a preset temperature, and keeping the roller-shaped mould at the preset temperature for a third time; and step S9, naturally cooling the roller-type mold at the preset temperature to the room temperature.
Further, the first quenching temperature is greater than or equal to 1000 ℃; the second quenching temperature is more than 500 ℃ and less than 1000 ℃; the third quenching temperature is more than or equal to 1000 ℃.
Further, the first quenching temperature is 1030 ℃; the second quenching temperature is more than or equal to 800 ℃ and less than or equal to 850 ℃; the third quenching temperature was 1030 ℃.
Further, the first tempering temperature is more than or equal to 0 ℃ and less than or equal to 500 ℃, and the first time length is more than or equal to 12 hours and less than or equal to 36 hours; the second tempering temperature is more than or equal to 500 ℃ and less than or equal to 1000 ℃, and the second time length is more than or equal to 12 hours and less than or equal to 36 hours.
Further, the first tempering temperature is 150 ℃, and the first time length is 24 hours; the second tempering temperature is 750 ℃ and the second time period is 24 hours.
Further, the critical temperature is 0 ℃ or lower.
Further, the critical temperature is 190 ℃ below zero.
Further, the preset temperature is greater than or equal to 500 ℃ and less than or equal to 1000 ℃, and the third time period is greater than or equal to 12 hours and less than or equal to 36 hours.
Further, the preset temperature is greater than or equal to 520 ℃ and less than or equal to 550 ℃, and the third time period is 24 hours.
Further, the HRC hardness of the roll mold base material at the original room temperature hardness is 20; the refrigerant is liquid nitrogen.
Furthermore, the aperture compensation shrinkage of the rotating shaft mounting hole is more than or equal to 0.5mm and less than or equal to 0.8 mm.
By applying the technical scheme of the invention, the heat treatment repairing method of the roller-type die is provided, the hole diameter of the rotating shaft mounting hole before abrasion can be recovered as far as possible after the hole wall abrasion loss of the rotating shaft mounting hole of the roller-type die is subjected to the heat treatment repairing method, and the hole diameter of the rotating shaft mounting hole expanded due to the hole wall abrasion is effectively reduced, so that the gap between the hole wall surface of the rotating shaft mounting hole and the outer wall surface of the rotating shaft is favorably reduced, the coaxiality of the roller-type die and the rotating shaft is further ensured, the roller-type die can roll out qualified rims, the roller-type die is ensured to be reused, the service life of the roller-type die is greatly prolonged, and the processing and manufacturing cost of the roller-type die is favorably reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a flowchart of a heat treatment repairing method of a roll type mold according to an alternative embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem that the wear loss of the hole wall of the rotating shaft mounting hole is scrapped after reaching a preset value in the long-term use process of the roller-shaped die in the prior art, and the service life of the roller-shaped die is shortened, the invention provides a heat treatment repairing method of the roller-shaped die, which is used for compensating the wear loss of the hole wall of the rotating shaft mounting hole of the roller-shaped die and comprises the step S1 of carrying out primary quenching treatment on the roller-shaped die at room temperature so as to heat the roller-shaped die to a first quenching temperature; step S2, annealing the roller mold after the primary quenching treatment until the hardness of the roller mold is restored to the original room temperature hardness of the roller mold base material for processing and manufacturing the roller mold; step S3, carrying out secondary quenching treatment on the roller-shaped die after annealing treatment in the furnace so as to heat the roller-shaped die to a second quenching temperature; step S4, carrying out primary tempering treatment on the roller-shaped mould after the secondary quenching treatment until the temperature of the roller-shaped mould is reduced to a first tempering temperature, and keeping the roller-shaped mould at the first tempering temperature for a first time; step S5, rapidly cooling the roller-shaped mould from the first tempering temperature to the critical temperature by using a refrigerant; step S6, carrying out quenching treatment for three times on the roller-shaped die rapidly cooled to the critical temperature so as to heat the roller-shaped die to a third quenching temperature; step S7, carrying out secondary tempering treatment on the roller-shaped die after the tertiary quenching treatment until the temperature of the roller-shaped die is reduced to a second tempering temperature, and keeping the roller-shaped die at the second tempering temperature for a second time; step S8, naturally cooling the roller-shaped mould from the second tempering temperature to a preset temperature, and keeping the roller-shaped mould at the preset temperature for a third time; and step S9, naturally cooling the roller-type mold at the preset temperature to the room temperature.
The technical scheme of the invention is applied to the application, and the heat treatment repairing method of the roller-shaped die is provided, so that the abrasion loss of the hole wall of the rotating shaft mounting hole of the roller-shaped die can be recovered to the hole diameter of the rotating shaft mounting hole before abrasion as much as possible after the heat treatment repairing method is carried out, the hole diameter of the rotating shaft mounting hole expanded due to the abrasion of the hole wall is effectively reduced, the gap between the hole wall surface of the rotating shaft mounting hole and the outer wall surface of the rotating shaft is favorably reduced, the coaxiality of the roller-shaped die and the rotating shaft is further ensured, the roller-shaped die can roll out qualified rims, the roller-shaped die can be repeatedly used, the service life of the roller-shaped die is greatly prolonged, and the processing and manufacturing cost of the roller-shaped die is favorably reduced.
It should be noted that, in the present application, in order to ensure that the bore diameter of the rotating shaft mounting hole after the heat treatment and repair of the roller-type mold can be restored to the bore diameter of the rotating shaft mounting hole before the wear as much as possible, optionally, the first quenching temperature is greater than or equal to 1000 ℃; the second quenching temperature is more than 500 ℃ and less than 1000 ℃; the third quenching temperature is more than or equal to 1000 ℃.
Preferably, the first quenching temperature is 1030 ℃; the second quenching temperature is more than or equal to 800 ℃ and less than or equal to 850 ℃; the third quenching temperature was 1030 ℃. In this way, by optimizing the first quenching temperature, the second quenching temperature and the third quenching temperature, the aperture of the rotating shaft mounting hole of the roller-shaped die can be recovered to the aperture of the rotating shaft mounting hole before abrasion, and simultaneously, the hardness and the abrasion resistance of the roller-shaped die after heat treatment and repair can be equal to those of the roller-shaped die before abrasion as far as possible.
It should be noted that, in the present application, in order to ensure that the roll-type mold still has sufficient toughness after being heat-treated and repaired, optionally, the first tempering temperature is greater than or equal to 0 ℃ and less than or equal to 500 ℃, and the first time length is greater than or equal to 12 hours and less than or equal to 36 hours; the second tempering temperature is more than or equal to 500 ℃ and less than or equal to 1000 ℃, and the second time length is more than or equal to 12 hours and less than or equal to 36 hours.
Preferably, the first tempering temperature is 150 ℃ and the first time length is 24 hours; the second tempering temperature is 750 ℃ and the second time period is 24 hours. Therefore, the toughness of the roller-shaped die can be effectively improved after tempering treatment by optimizing the first tempering temperature, the first time length, the second tempering temperature and the second time length, so that the toughness of the roller-shaped die can be recovered to the toughness of the roller-shaped die before abrasion as much as possible.
Alternatively, the critical temperature is 0 ℃ or less. Therefore, the toughness of the roller-shaped die can be obviously improved after the roller-shaped die is subjected to cryogenic treatment.
Preferably, the critical temperature is 190 ℃ below zero. Therefore, by optimizing the critical temperature, the toughness of the roller-shaped die can be obviously improved, and the phenomenon that the outer surface of the roller-shaped die cracks due to the fact that the roller-shaped die at a high temperature after being heated is transferred to a low-temperature environment can be avoided as far as possible.
It should be noted that, in the present application, in order to ensure that the roller-type mold in the high temperature state still has the preset mechanical properties after cooling, optionally, the preset temperature is greater than or equal to 500 ℃ and less than or equal to 1000 ℃, and the third time period is greater than or equal to 12 hours and less than or equal to 36 hours.
Preferably, the preset temperature is greater than or equal to 520 ℃ and less than or equal to 550 ℃, and the third time period is 24 hours. In this way, by optimizing the preset temperature and the third time, the roller-type die at high temperature can be ensured to still maintain the preset mechanical property after being cooled at the proper preset temperature and within the proper time.
In the present application, considering that the roll mold is used for rolling the roll mold base material, since the roll mold base material has a certain hardness, the HRC hardness of the roll mold base material at the original room temperature hardness is 20 in order to ensure that the roll mold can apply an effective roll pressure to the roll mold base material.
In the present application, considering that the content of nitrogen in air is large, the source for producing liquid nitrogen is wide, and the refrigeration effect of liquid nitrogen is good, preferably, the refrigerant is liquid nitrogen.
In the present application, the bore diameter compensation shrinkage of the rotating shaft mounting hole is 0.5mm or more and 0.8mm or less. Therefore, by optimizing the aperture compensation shrinkage of the rotating shaft mounting hole, the problem that the gap between the hole wall surface of the rotating shaft mounting hole and the outer wall surface of the rotating shaft cannot be effectively reduced due to the fact that the aperture compensation shrinkage of the rotating shaft mounting hole is too small is avoided; and the problem that the roller-shaped die cannot be installed on the rotating shaft due to overlarge aperture compensation shrinkage of the rotating shaft installation hole can also be avoided.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A heat treatment repairing method of a roller type die is characterized in that the method is used for compensating the hole wall abrasion loss of a rotating shaft mounting hole of the roller type die and comprises the following steps:
step S1, carrying out primary quenching treatment on the roller-shaped die at room temperature to heat the roller-shaped die to a first quenching temperature;
step S2, annealing the roller mold after the primary quenching treatment until the hardness of the roller mold is restored to the original room temperature hardness of the roller mold base material for processing and manufacturing the roller mold;
step S3, carrying out secondary quenching treatment on the roller-shaped die after annealing treatment in the furnace so as to heat the roller-shaped die to a second quenching temperature;
step S4, carrying out primary tempering treatment on the roller-shaped mould after the secondary quenching treatment until the temperature of the roller-shaped mould is reduced to a first tempering temperature, and keeping the roller-shaped mould at the first tempering temperature for a first time;
step S5, cooling the roller mold rapidly from the first tempering temperature to a critical temperature using a refrigerant;
step S6, performing quenching treatment for three times on the roller-shaped mold rapidly cooled to the critical temperature to heat the roller-shaped mold to a third quenching temperature;
step S7, carrying out secondary tempering treatment on the roller-shaped die after the tertiary quenching treatment until the temperature of the roller-shaped die is reduced to a second tempering temperature, and keeping the roller-shaped die at the second tempering temperature for a second time;
step S8, naturally cooling the roller-shaped mould from the second tempering temperature to a preset temperature, and keeping the roller-shaped mould at the preset temperature for a third time;
step S9, naturally cooling the roller-shaped mold at the preset temperature to room temperature;
the first quenching temperature is greater than or equal to 1000 ℃;
the second quenching temperature is more than 500 ℃ and less than 1000 ℃;
the third quenching temperature is more than or equal to 1000 ℃;
the HRC hardness of the roller die base material at the original room temperature hardness is 20; the refrigerant is liquid nitrogen;
the first tempering temperature is more than or equal to 0 ℃ and less than or equal to 500 ℃, and the first time length is more than or equal to 12 hours and less than or equal to 36 hours;
the second tempering temperature is greater than or equal to 500 ℃ and less than or equal to 1000 ℃, and the second time length is greater than or equal to 12 hours and less than or equal to 36 hours;
the preset temperature is greater than or equal to 500 ℃ and less than or equal to 1000 ℃, and the third time is greater than or equal to 12 hours and less than or equal to 36 hours.
2. A heat treatment repairing method of a roll type mold according to claim 1,
the first quenching temperature is 1030 ℃;
the second quenching temperature is more than or equal to 800 ℃ and less than or equal to 850 ℃;
the third quenching temperature is 1030 ℃.
3. A heat treatment repairing method of a roll type mold according to claim 1,
the first tempering temperature is 150 ℃, and the first time duration is 24 hours;
the second tempering temperature is 750 ℃ and the second time period is 24 hours.
4. A heat treatment repairing method for roll type mold according to claim 1, characterized in that said critical temperature is 0 ℃ or less.
5. A heat treatment repairing method for roller type mold according to claim 4, characterized in that said critical temperature is 190 ℃ below zero.
6. A heat treatment repairing method of a roll type mold according to claim 1,
the preset temperature is greater than or equal to 520 ℃ and less than or equal to 550 ℃, and the third time is 24 hours.
7. The heat treatment repairing method of a roller type mold according to claim 1, wherein an aperture compensation shrinkage amount of the rotating shaft mounting hole is 0.5mm or more and 0.8mm or less.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911358706.4A CN111041164B (en) | 2019-12-25 | 2019-12-25 | Heat treatment repairing method for roller type die |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911358706.4A CN111041164B (en) | 2019-12-25 | 2019-12-25 | Heat treatment repairing method for roller type die |
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| CN111041164B true CN111041164B (en) | 2022-01-25 |
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| CN111633519B (en) * | 2020-06-16 | 2022-01-07 | 盐城金刚星精密锻造有限公司 | Shaft type die surface flaw detection repairing device and using method |
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| CN103643015A (en) * | 2013-12-05 | 2014-03-19 | 东北石油大学 | Expansion hot-state externally-pressed surface shaping and repairing process of oil field waste perforating gun |
| CN104342539A (en) * | 2013-08-07 | 2015-02-11 | 上海市沪东锻造厂有限公司 | Bearing bush white point eliminating process |
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2019
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| CN88101145A (en) * | 1987-03-06 | 1988-09-14 | 威廉姆·H·莫里 | Improved method of heat treating ferrous alloys |
| CN101403031A (en) * | 2007-10-07 | 2009-04-08 | 王笑银 | Weldless steel tube hole shrinkage |
| CN104342539A (en) * | 2013-08-07 | 2015-02-11 | 上海市沪东锻造厂有限公司 | Bearing bush white point eliminating process |
| CN103643015A (en) * | 2013-12-05 | 2014-03-19 | 东北石油大学 | Expansion hot-state externally-pressed surface shaping and repairing process of oil field waste perforating gun |
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