CN112872259B - Forging method for improving impact property of 1Cr17Ni2 - Google Patents
Forging method for improving impact property of 1Cr17Ni2 Download PDFInfo
- Publication number
- CN112872259B CN112872259B CN202011557183.9A CN202011557183A CN112872259B CN 112872259 B CN112872259 B CN 112872259B CN 202011557183 A CN202011557183 A CN 202011557183A CN 112872259 B CN112872259 B CN 112872259B
- Authority
- CN
- China
- Prior art keywords
- forging
- heat preservation
- temperature
- furnace
- quenching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention belongs to the field of material processing, and relates to a forging method for improving the impact property of 1Cr17Ni2, wherein the method is used for tempering a 1Cr17Ni2 raw material at a medium temperature of 515-520 ℃; then hammering, forging, annealing, forming and forging after surface processing, and finally performing heat treatment; when the free forging hammer is used for producing a blank, 1-2 fire is required to be finished, the heat preservation time is not required to be prolonged during forging, and the forging time of each forging furnace is controlled within 45 min; wherein the deformation amount is 30-35% when upsetting, drawing and forging, the upsetting, drawing and forging times are as follows: 2-3 times. The forging method of the invention enables the grain size and the mechanical property to reach the expected requirements, and improves the structure reliability of the 1Cr17Ni2 steel forging.
Description
Technical Field
The invention belongs to the field of material processing, relates to a forging method for improving 1Cr17Ni2 impact performance, and particularly relates to a forging method for improving Chinese tempering impact value of forging of a die of a 1Cr17Ni2 forge piece.
Background
The 1Cr17Ni2 steel is generally applied to bearing parts or rotating parts of wet media in aviation, has high requirements on the tensile property and the impact property of a forged piece in use, but has obvious influences on numerical values of the forging temperature and the heating frequency in the forging process. The conventional forging method comprises the following steps: blanking, forging a blank die, forging a heat treatment, finishing the forging blank and the forging of the blank die within 1 heating, and carrying out physical and chemical detection on the forged piece; the tensile and impact properties (about 30J) of the forged piece after the conventional treatment can not meet the use requirements (the required performance index is more than or equal to 39J). Therefore, the reasonable forging method is selected to have the important influence on the structure and the performance of the material. Particularly, the special-shaped free forging piece increases the heating times to cause the local empty burning of the forging piece, the physical and chemical properties are obviously influenced, and a large amount of unqualified forging pieces are generated.
Disclosure of Invention
The purpose of the invention is: the forging method for improving the impact performance of 1Cr17Ni2 is provided, the original structure of the raw material is improved through heat treatment, the forging method is used for meeting the forging forming scheme with reasonable design requirements of a forging piece, and the qualified and stable impact performance index is obtained.
In order to solve the technical problem, the technical scheme of the invention is as follows:
a forging method for improving the impact property of 1Cr17Ni2 is characterized in that 1Cr17Ni2 raw material is tempered at medium temperature, wherein the tempering temperature is 515-520 ℃; then hammering, forging, annealing, surface machining, forming and forging, and finally performing heat treatment.
The method comprises the following steps:
step one, performing heat treatment on the raw material to improve the original structure of the raw material: carrying out quenching and medium-temperature tempering treatment on the raw material blank;
a quenching system: charging into a furnace at the temperature of less than or equal to 800 ℃, heating to 930-970 ℃, preserving heat and cooling; medium temperature tempering: charging into a furnace at the temperature of less than or equal to 500 ℃, heating to 515-520 ℃, and preserving heat; the heat preservation time is calculated according to the size of the blank;
step two, forging the blank
The forging temperature of the blank is 1100-1110 ℃, the heat preservation coefficient is 0.6min/mm, the hammer anvil is preheated to 200-350 ℃, the temperature of the forge piece is preserved for a set time, the forge piece is immediately taken out of the furnace and is upset, pulled and forged on the free forging hammer, and the medium and final forging temperature is controlled;
step three, forging to the preformed size
Annealing the preformed piece, and preserving heat in a heat preservation furnace at 540-55 ℃, wherein the heat preservation coefficient is 1.0-1.2 min/mm;
step four, forming and forging
Heating the preformed piece to 1105-1110 ℃, calculating the heat preservation coefficient according to 0.6min/mm, and preheating a tool mold to 250-350 ℃ while heating the preformed piece; immediately discharging the preformed piece from the furnace and forging after the preformed piece is subjected to heat preservation for a set time, wherein the transfer time is less than or equal to 20 seconds;
step five, heat treatment of the formed part
Quenching and medium-temperature tempering treatment are carried out on the formed part, wherein the quenching system comprises the following steps: charging into a furnace at the temperature of less than or equal to 800 ℃, heating to 990-1000 ℃, preserving heat and cooling; medium temperature tempering: charging into a furnace at the temperature of less than or equal to 515 ℃, heating to between 515 and 520 ℃, and preserving heat;
and step six, performing mechanical property inspection by 100%.
In the first step, the quenching heat preservation coefficient is 1.5 min/mm-2.0 min/mm; the tempering heat preservation coefficient is 1.8 min/mm-2.5 min/mm.
And step two, discharging and transferring time is not more than 50s.
In the second step, the deformation amount is 30-35% when upsetting-drawing is changed, and upsetting-drawing times per fire are as follows: 2-3 times.
In the second step, when the blank is produced by using the free forging hammer, 1-2 fire is required to be finished, the heat preservation time is not required to be prolonged during forging, and the forging time of each forging furnace is controlled within 45 min.
In the fifth step, the quenching heat preservation time is calculated according to 1.8 min/mm-2.2 min/mm; the tempering heat preservation time is calculated according to 2.0 min/mm-2.6 min/mm.
And fifthly, preheating the tool at 200-350 ℃, and checking the surface temperature of the tool.
Preferably, oil cooling is adopted for quenching cooling in the first step and the fifth step.
The invention has the beneficial effects that:
the 1Cr17Ni2 steel belongs to martensite-ferrite stainless steel and is used after quenching (solid solution) and tempering (aging) treatment, the invention belongs to the field of medium temperature tempering, and the processed forged piece has good corrosion resistance and higher impact performance, and the impact performance index is more than or equal to 39J.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the examples of the present invention will be briefly explained below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.
FIG. 1 is a schematic sketch view of an embodiment 1;
FIG. 2 is a diagram of a specific tire mold of example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.
In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
Example 1:
(1) Designing a process flow: the forging bar → sawing is the length required by the process → heat treatment improves the raw material → modified forging → forging block → annealing → machining → moulding die forging → heat treatment → physicochemical.
(2) Lower technological requirement specification blank (phi 90X 185)
(3) Quenching and medium-temperature tempering the raw material blank: a quenching system: charging into a furnace at the temperature of less than or equal to 800 ℃, heating to 950 ℃, preserving heat and cooling with oil; medium temperature tempering: charging into a furnace at a temperature of less than or equal to 500 ℃, heating to 515 ℃, and preserving heat; keeping the temperature for 120min, cooling with oil
(4) The bar stock is forged by 2 upsetting and 2 drawing (phi 90X 185 axial upsetting to phi 115X 110 +/-5 axial drawing forging to phi 96333372, 85X 160 +/-5 axial upsetting to phi 96333333103X 110 +/-5 axial drawing forging to phi 9633333385X 160 +/-5), the forging deformation is controlled to be 32 percent, and the forging deformation is controlled to be 30 to 35 percent;
(5) Then forging a rough shape, (rolling \9633; 85X 160 to phi 75X 265, then drawing out one end of the material 145 to phi 45, and the total length is 430 mm) matching the rod part size phi 45 of the rough shape with the special tire mold rod part size to ensure that the rough shape can be smoothly placed into the tire mold;
(6) Then, carrying out heat treatment (annealing) on the pierced billet to eliminate material stress generated in the forging pierced billet process;
(7) And then, carrying out die forging and final forming on the rough shape by using a reasonably designed die.
(8) After the forging is subjected to final heat treatment, 4 samples are taken for physical and chemical treatment, and the results are shown in the following table 1:
TABLE 1
| Sample number | Impact (J) |
| 1 | 42.0 |
| 2 | 41.8 |
| 3 | 40.3 |
| 4 | 42.2 |
| Standard of merit | ≥39 |
Example 2:
(1) Designing a process flow: the bar for forging → sawing is the length required by the process → heat treatment improves the raw material → improved forging → annealing → secondary blanking → forging → heat treatment → physicochemical.
(2) Lower specification blank (phi 120X 190)
(3) Quenching and medium-temperature tempering the raw material blank: a quenching system: charging into a furnace at the temperature of less than or equal to 800 ℃, heating to 950 ℃, preserving heat and cooling with oil; medium temperature tempering: charging into a furnace at a temperature of less than or equal to 500 ℃, heating to 515 ℃, and preserving heat; keeping the temperature for 150min, and cooling with oil
(4) The bar stock is forged by 2 upsetting and 2 drawing (phi 120X 190 axial upsetting to phi 140X 140 +/-5 axial drawing forging to phi 96333372; 106X 190 +/-5 axial upsetting to phi 963333220; 125X 130 +/-5 axial drawing forging to phi 9633335; 106X 190 +/-5), the forging deformation is controlled to be 32 percent, and the forging deformation is controlled to be 30 to 35 percent;
(5) Subjecting the blank to a heat treatment (annealing)
(6) Dividing 1 piece of the blank into 2 pieces along the length direction (9633106X 190), and making the single piece size be (963333a) 106X ≥ 90
(7) Finally forging and forming a 9633106X 90 forging to obtain a 60X 95X 185 forging
(8) Subsequently, 4 samples were taken for physical and chemical treatment after the final heat treatment of the pierced blank, and the results are shown in table 2:
TABLE 2
| Sample number | Impact (J) |
| 1 | 41.8 |
| 2 | 41.5 |
| 3 | 43.2 |
| 4 | 42.6 |
| Standard of merit | ≥39 |
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (9)
1. A forging method for improving impact property of 1Cr17Ni2 is characterized by comprising the following steps: the method comprises the following steps:
step one, carrying out heat treatment on a 1Cr17Ni2 raw material: carrying out quenching and medium-temperature tempering treatment on the raw material blank;
a quenching system: charging into a furnace at the temperature of less than or equal to 800 ℃, heating to 930-970 ℃, preserving heat and cooling; medium temperature tempering: charging into a furnace at the temperature of less than or equal to 500 ℃, heating to 515-520 ℃, and preserving heat; the heat preservation time is calculated according to the size of the blank;
step two, forging the blank
The forging-modifying temperature of the blank is 1100-1110 ℃, the heat preservation coefficient is 0.6min/mm, the hammer anvil is preheated to 200-350 ℃, the temperature of the forge piece is preserved for a set time, the forge piece is immediately taken out of the furnace and is subjected to upsetting-drawing forging-modifying on a free forging hammer, and the medium and final forging temperature is controlled;
step three, forging to a pre-formed size, annealing the pre-formed piece, and preserving heat in a heat preservation furnace at 540 ℃, wherein the heat preservation coefficient is 1.0-1.2 min/mm;
step four, forming and forging after surface processing
Heating the preformed piece to 1105-1110 ℃, calculating the heat preservation coefficient according to 0.6min/mm, and preheating a tool mold to 250-350 ℃ while heating the preformed piece; immediately discharging the preformed piece from the furnace and forging after the preformed piece is subjected to heat preservation for a set time, wherein the transfer time is less than or equal to 20 seconds;
step five, heat treatment of the formed part
Quenching and medium-temperature tempering treatment are carried out on the formed part, wherein the quenching system comprises the following steps: charging into the furnace at a temperature of less than or equal to 800 ℃, heating to 990-1000 ℃, preserving heat and cooling; medium temperature tempering: charging into the furnace at 515 deg.c or lower, heating to 515-520 deg.c and maintaining.
2. The method of claim 1, wherein: in the first step, the quenching heat preservation coefficient is 1.5 min/mm-2.0 min/mm; the tempering heat preservation coefficient is 1.8 min/mm-2.5 min/mm.
3. The method of claim 1, wherein: in the first step, oil cooling is adopted for quenching cooling.
4. The method of claim 1, wherein: and step two, discharging and transferring time is not more than 50s.
5. The method of claim 1, wherein: in the second step, the deformation amount is 30-35% when upsetting-drawing and forging, and upsetting-drawing times are as follows: 2-3 times.
6. The method of claim 1, wherein: and in the second step, when the blank is produced by the free forging hammer, 1-2 fire is required to be finished, the heat preservation time is not required to be prolonged during forging, and the forging time of each forging furnace is controlled within 45 min.
7. The method of claim 1, wherein: in the fifth step, the quenching heat preservation time is calculated according to 1.8 min/mm-2.2 min/mm; the tempering heat preservation time is calculated according to 2.0 min/mm-2.6 min/mm.
8. The method of claim 1, wherein: and step five, preheating the tool at 200-350 ℃.
9. The method of claim 1, wherein: and step five, oil cooling is adopted for quenching and cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011557183.9A CN112872259B (en) | 2020-12-24 | 2020-12-24 | Forging method for improving impact property of 1Cr17Ni2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011557183.9A CN112872259B (en) | 2020-12-24 | 2020-12-24 | Forging method for improving impact property of 1Cr17Ni2 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112872259A CN112872259A (en) | 2021-06-01 |
| CN112872259B true CN112872259B (en) | 2023-03-31 |
Family
ID=76043573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011557183.9A Active CN112872259B (en) | 2020-12-24 | 2020-12-24 | Forging method for improving impact property of 1Cr17Ni2 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112872259B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444861A (en) * | 2021-07-01 | 2021-09-28 | 沈阳航天新光集团有限公司 | One-time tempering heat treatment processing technology suitable for 1Cr17Ni2 stainless steel |
| CN114160722A (en) * | 2021-12-15 | 2022-03-11 | 陕西宏远航空锻造有限责任公司 | Method for forming high-temperature alloy forging internal structure influence of hot material system on forging |
| CN114769481B (en) * | 2022-05-05 | 2023-12-26 | 无锡派克新材料科技股份有限公司 | Forging process for improving impact of stainless steel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3888865B2 (en) * | 2000-10-25 | 2007-03-07 | 株式会社ゴーシュー | Forging method |
| CN105603169B (en) * | 2016-03-07 | 2017-12-15 | 江苏大学 | The short route manufacture method of large-scale 30CrNi2MoV steel parts |
| CN106399860B (en) * | 2016-06-06 | 2018-01-19 | 中原特钢股份有限公司 | A kind of method for manufacturing of 1Cr17Ni2 piston rods forging |
| CN106591754A (en) * | 2016-12-12 | 2017-04-26 | 陕西宏远航空锻造有限责任公司 | Forging method using flat-die hammer to improve structure property of TC21 titanium alloy |
| CN108246948B (en) * | 2017-12-07 | 2020-06-09 | 陕西宏远航空锻造有限责任公司 | Forging method for improving GH901 die forging structure |
| CN109622833A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of structural homogeneity control method of big thickness Ti-6Al-2Sn-4Zr-2Mo alloy forged piece |
-
2020
- 2020-12-24 CN CN202011557183.9A patent/CN112872259B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 苏娟华等.大型挤压辊锻件两次镦拔工艺锻前加热研究.金属热处理.2008,33(08),第152-155页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112872259A (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112872259B (en) | Forging method for improving impact property of 1Cr17Ni2 | |
| US3614816A (en) | Method of making cartridge cases | |
| CN102284835B (en) | Method for producing 10.9-class vehicle bolt of above M12 | |
| CN107116167A (en) | A kind of forging technology of auto parts | |
| CN111299495A (en) | Green forging process method for transition section | |
| CN110804690A (en) | Manufacturing process for improving ultrasonic detection qualification rate of 42CrMo forge piece | |
| CN107866660A (en) | A kind of die steel processing technology | |
| CN113510205A (en) | Die forging and roll forming method for high-temperature alloy special-shaped section flange disc-shaped part | |
| CN111570687B (en) | Forging process of sliding frame | |
| CN107964578A (en) | A kind of automobile die steel processing technology | |
| CN112626419B (en) | Manufacturing process of large-scale main shaft single vacuum steel ingot forge piece | |
| CN107716840B (en) | Production process of ring forging | |
| CN116532510A (en) | Preparation method for improving mechanical properties of TB13 titanium alloy wire for spectacle frame | |
| CN114433758B (en) | Forging processing method of high-silver aluminum alloy | |
| JPH07108340A (en) | Manufacture of coarse shape material for rolling bearing race | |
| CN113083937B (en) | Production process of bearing steel pipe for cold-rolled expanded bearing | |
| CN110814249B (en) | Forming method of stainless steel long pipe forging | |
| CN113510204A (en) | Die forging blank making and ring rolling composite forming method for shield machine cutter ring special-shaped ring piece | |
| CN114472782A (en) | Output gear shaft forging process | |
| CN116555527A (en) | Forming method for improving grain size of 1Cr10Co6MoVNbN forging | |
| CN111702431A (en) | Shell case manufacturing process | |
| CN115921733A (en) | Method for forming influence of alloy element content on internal structure of forging | |
| CN112846013B (en) | Method for manufacturing forging blank for oil exploitation equipment | |
| CN113798420B (en) | Forging method of non-magnetic retaining ring of 1Mn18Cr18N of turbogenerator | |
| CN220329870U (en) | Forging die for titanium alloy cone forging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |