CN110512067B - Method for reducing deformation of large thin-wall casting half gear ring casting through performance heat treatment - Google Patents
Method for reducing deformation of large thin-wall casting half gear ring casting through performance heat treatment Download PDFInfo
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- CN110512067B CN110512067B CN201910956967.XA CN201910956967A CN110512067B CN 110512067 B CN110512067 B CN 110512067B CN 201910956967 A CN201910956967 A CN 201910956967A CN 110512067 B CN110512067 B CN 110512067B
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- half gear
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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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
- C21D2261/00—Machining or cutting being involved
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- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting, which comprises the following steps: casting a half gear ring, designing a tie bar welding support structure, splicing reinforcing bolts, preparing an auxiliary tool, transferring a casting, and performing a second heat treatment heating process and tempering. The invention is suitable for a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting, reduces the use of a lacing wire welding support structure, a reinforcing bolt splicing and an auxiliary tray tool used for the performance heat treatment deformation of the large thin-wall casting half gear ring in the heat treatment process, and obviously reduces the heat treatment deformation of the large casting half gear ring under the action of self gravity due to uneven support points and uneven support surface when the large casting half gear ring is heated at high temperature. The maximum diameter is about 6000mm, and the deformation of the half gear ring with the effective wall thickness of about 160mm is controlled within 20mm, so that the subsequent processing requirements are met.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a method for reducing deformation of a large thin-wall casting half gear ring casting through performance heat treatment.
Background
The semi-gear ring of the large casting is an important part on a ball mill, the ball mill is key equipment after materials are crushed, and the semi-gear ring is widely applied to production industries of cement, chemical fertilizer, nonferrous metal mineral separation, glass ceramic and the like.
The semi-gear ring casting of the large casting has larger size and complex shape, and the performance heat treatment adopts quenching and tempering heat treatment. A significant difficulty in the heat treatment process is heat treatment distortion. In order to improve the heat treatment deformation of a half gear ring casting in the heat treatment process under the environment that the market situation is severe and cost reduction and efficiency improvement of enterprises are achieved, the method focuses on effectively controlling the high-temperature process of the half gear ring of the large casting.
Disclosure of Invention
The invention provides a method for reducing deformation of a large thin-wall casting semi-gear ring casting through performance heat treatment, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting comprises the following steps:
casting a half gear ring, wherein the half gear ring is cast through a common sand mold and is mechanically processed to a heat treatment quenching and tempering allowance size;
designing a lacing wire welding support structure, and selecting a steel pipe welding diameter part and a steel pipe welding radius part;
splicing the reinforcing bolts, and splicing the two half gear rings into a complete gear ring;
step four, preparing an auxiliary tool, selecting an auxiliary tray tool to be used as a lifting support stress tool, and placing the spliced complete gear ring on the auxiliary tray tool;
transferring the casting, and placing the complete gear ring and the auxiliary tray tool on the flat sizing block at the bottom of the furnace by using a two-point crane;
step six, performing a second heat treatment heating process according to a heat treatment process, after the heat preservation at the quenching temperature of 890 ℃, using a two-point hoisting tool to smoothly hoist the auxiliary tray tool and the complete gear ring, and transferring the auxiliary tray tool and the complete gear ring to quenching oil tank equipment;
and seventhly, tempering, after the casting is cooled, executing a tempering process by a tempering furnace, and after tempering, hoisting the auxiliary tray tool and the complete gear ring by two points and placing the auxiliary tray tool and the complete gear ring on a flat sizing block outside the furnace for air cooling.
In a preferable embodiment of the present invention, in the first step, the material of the half ring gear is GS-42CrMo 4-V1.
In a preferred embodiment of the present invention, in the second step, the steel pipe is made of 20 steel, and has a diameter of 108mm and a wall thickness of 22 mm.
In a preferred technical scheme of the invention, in the third step, four M30 x 140 bolts are selected to fix the half gear ring.
As a preferred technical scheme of the invention, in the fourth step, the auxiliary tray tool support part has an outer diameter dimension phi 6650mm, an inner diameter dimension phi 4380mm and a thickness of 750mm, and the total number is 8 support platforms.
As a preferred technical solution of the present invention, in the fourth step, the auxiliary pallet tool is processed before use, and the support platform and the bottom plane are leveled.
As a preferable technical scheme of the invention, in the seventh step, deformation detection is performed after the complete gear ring is cooled to room temperature.
The invention has the following advantages:
the invention is suitable for a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting, reduces the use of a lacing wire welding support structure, a reinforcing bolt splicing and an auxiliary tray tool used for the performance heat treatment deformation of the large thin-wall casting half gear ring in the heat treatment process, and obviously reduces the heat treatment deformation of the large casting half gear ring under the action of self gravity due to uneven support points and uneven support surface when the large casting half gear ring is heated at high temperature. The maximum diameter is about 6000mm, and the deformation of the half gear ring with the effective wall thickness of about 160mm is controlled within 20mm, so that the subsequent processing requirements are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a heat treatment quenching and tempering diagram of a half gear ring in a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting.
FIG. 2 is a schematic diagram of a tie bar welding support structure in a performance heat treatment deformation reduction method for a large thin-wall casting half gear ring casting.
FIG. 3 is a schematic diagram of two half gear rings after splicing in a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting.
FIG. 4 is a schematic view of an auxiliary tray tool in a performance heat treatment deformation reduction method for a large thin-wall casting half gear ring casting.
FIG. 5 is a second heat treatment process curve diagram in the performance heat treatment deformation reducing method of a large thin-wall casting half gear ring casting.
FIG. 6 is a flow chart of a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting.
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. 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.
Example one
Referring to fig. 1-6, a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting comprises the following steps:
casting a half gear ring through a common sand mold, wherein the half gear ring is made of GS-42CrMo4-V1, and is mechanically processed to be in a heat treatment quenching and tempering allowance size;
designing a lacing wire welding support structure, and selecting a steel pipe welding diameter part and a steel pipe welding radius part, wherein the steel pipe is made of 20 steel, 108mm in diameter and 22mm in wall thickness;
step three, splicing reinforcing bolts, namely splicing the two half gear rings into a complete gear ring, fixing the half gear rings by using four M30 x 140 bolts, splicing the two half gear rings into a complete gear ring, reducing the lifting deformation, wherein four bolt holes are formed in the opening of each half gear ring and are used for splicing the two half gear rings;
step four, preparing an auxiliary tool, selecting an auxiliary tray tool to be used as a lifting support stress tool, lifting the auxiliary tray tool at two points instead of a gear ring, avoiding axial deformation caused by directly lifting half gear rings, placing the spliced complete gear ring on the auxiliary tray tool, wherein the outer diameter of the support part of the auxiliary tray tool is phi 6650mm, the inner diameter of the support part of the auxiliary tray tool is phi 4380mm, the thickness of the support part of the auxiliary tray tool is 750mm, and counting 8 support platforms, the auxiliary tray tool is machined before being used, and the support platforms and the bottom plane are leveled so as to ensure the levelness of the spliced gear ring in the furnace to reduce radial deformation, and the two half gear rings are placed on the support platform of the auxiliary tool 8;
fifthly, transferring the casting, placing the complete gear ring and the auxiliary tray tool on a furnace bottom leveling sizing block by using a two-point crane, and ensuring that the axis of the auxiliary tray tool is superposed with the axis of the spliced complete ring, so that the supporting point of the casting can be divided as uniformly as possible, the contact area between the complete ring and the auxiliary tray tool can be increased, and the deformation of the complete ring caused by uneven supporting is reduced;
step six, performing a second heat treatment heating process (the first step to the fifth step are performed in a cold state) according to a heat treatment process (the treatment process is shown in figure 5), after the heat preservation at 890 ℃ is finished, using a two-point hoisting tool to level and hoist the auxiliary tray tool and the complete gear ring, and transferring the tool to quenching oil tank equipment, so that the field operation is stable and fast, and the deformation in a high-temperature state can be reduced;
and seventhly, tempering, after the casting is cooled, executing a tempering process by a tempering furnace, and after tempering, hoisting the auxiliary tray tool and the complete gear ring by two points and placing the auxiliary tray tool and the complete gear ring on a flat sizing block outside the furnace for air cooling.
Example two
The other contents of this embodiment are the same as those of the first embodiment, except that: and seventhly, carrying out deformation detection after the complete gear ring is cooled to the room temperature. In order to ensure the quality of the product, after the whole processing is finished, the deformation of the product needs to be detected to check whether the production requirement is met
The invention is suitable for a performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting, reduces the use of a lacing wire welding support structure, a reinforcing bolt splicing and an auxiliary tray tool used for the performance heat treatment deformation of the large thin-wall casting half gear ring in the heat treatment process, and obviously reduces the heat treatment deformation of the large casting half gear ring under the action of self gravity due to uneven support points and uneven support surface when the large casting half gear ring is heated at high temperature. The maximum diameter is about 6000mm, and the deformation of the half gear ring with the effective wall thickness of about 160mm is controlled within 20mm, so that the subsequent processing requirements are met.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. A performance heat treatment deformation reducing method for a large thin-wall casting half gear ring casting is characterized by comprising the following steps:
casting a half gear ring, wherein the half gear ring is cast through a common sand mold and is mechanically processed to a heat treatment quenching and tempering allowance size;
designing a lacing wire welding support structure, and selecting a steel pipe welding diameter part and a steel pipe welding radius part, wherein the steel pipe is made of 20 steel, the diameter is 108mm, and the wall thickness is 22 mm;
splicing the reinforcing bolts, and splicing the two half gear rings into a complete gear ring;
step four, preparing an auxiliary tool, selecting an auxiliary tray tool to be used as a lifting support stress tool, placing the spliced complete gear ring on the auxiliary tray tool, wherein the outer diameter of the support position of the auxiliary tray tool is phi 6650mm, the inner diameter of the support position of the auxiliary tray tool is phi 4380mm, the thickness of the auxiliary tray tool is 750mm, the total number of the support platforms is 8, the width of each support platform is 300mm, the auxiliary tray tool is used for processing before use, and the support platforms and the bottom plane are subjected to vehicle leveling;
transferring the casting, namely placing the complete gear ring and the auxiliary tray tool on a furnace bottom leveling sizing block by using a two-point crane, and ensuring that the axis of the auxiliary tray tool is superposed with the axis of the spliced complete ring;
step six, performing a second heat treatment heating process according to a heat treatment process, after the heat preservation at the quenching temperature of 890 ℃, using a two-point hoisting tool to smoothly hoist the auxiliary tray tool and the complete gear ring, and transferring the auxiliary tray tool and the complete gear ring to quenching oil tank equipment;
and seventhly, tempering, after the casting is cooled, executing a tempering process by a tempering furnace, and after tempering, hoisting the auxiliary tray tool and the complete gear ring by two points and placing the auxiliary tray tool and the complete gear ring on a flat sizing block outside the furnace for air cooling.
2. The method for reducing the deformation of the large thin-wall casting half gear ring casting through the performance heat treatment according to claim 1, wherein in the step one, the material of the half gear ring is GS-42CrMo 4-V1.
3. The method for reducing the deformation of the large thin-wall casting half gear ring casting through the performance heat treatment according to claim 1, wherein in the third step, four M30 x 140 bolts are selected for fixing the half gear ring.
4. The method for reducing deformation of the large thin-wall casting half gear ring casting through performance heat treatment according to claim 1, wherein in the seventh step, deformation detection is performed after the complete gear ring is cooled to room temperature.
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| CN111394564B (en) * | 2020-04-29 | 2023-11-28 | 天津航天机电设备研究所 | High-rigidity platform for heat treatment of large thin-wall light alloy castings and application method thereof |
| CN113249561B (en) * | 2021-05-31 | 2022-09-23 | 上海电气上重铸锻有限公司 | Heat treatment method for ship stem casting |
| CN113732637B (en) * | 2021-09-26 | 2022-04-26 | 中信重工机械股份有限公司 | Large-diameter split type thin-wall gear ring machining method |
| CN115927824B (en) * | 2022-12-28 | 2024-07-09 | 二重（德阳）重型装备有限公司 | Method for controlling heat treatment deformation of U-shaped piece |
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| CN105714202A (en) * | 2016-03-31 | 2016-06-29 | 共享铸钢有限公司 | Casting production method for high-strength steel castings of coal mining machinery |
| CN106048186A (en) * | 2016-07-28 | 2016-10-26 | 共享铸钢有限公司 | Deformation-prevention heat treatment method for large thin-wall steel casting |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714202A (en) * | 2016-03-31 | 2016-06-29 | 共享铸钢有限公司 | Casting production method for high-strength steel castings of coal mining machinery |
| CN106048186A (en) * | 2016-07-28 | 2016-10-26 | 共享铸钢有限公司 | Deformation-prevention heat treatment method for large thin-wall steel casting |
Non-Patent Citations (1)
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| Φ2500mm煅烧炉齿圈表面淬火热处理;杨福杰等;《纯碱工业》;20011031(第5期);第39-42页 * |
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