CN107299295B - The moulding process of the oily rail of super-pressure stainless steel forging and stamping - Google Patents
The moulding process of the oily rail of super-pressure stainless steel forging and stamping Download PDFInfo
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- CN107299295B CN107299295B CN201710428439.8A CN201710428439A CN107299295B CN 107299295 B CN107299295 B CN 107299295B CN 201710428439 A CN201710428439 A CN 201710428439A CN 107299295 B CN107299295 B CN 107299295B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing 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
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses the moulding process that a kind of super-pressure stainless steel forges and presses oily rail, it includes the following steps：1) blanking；2) heating in medium frequency；3) blocking；4) finish forge；5) trimming；6) it quenches；7) ball blast；8) acid wash passivation.The obtained oily rail of super-pressure stainless steel forging and stamping through the invention, relatively existing soldering class stainless steel oil rail product, the technical process such as welding can creatively be saved, and then effectively evades existing soldering class stainless steel oil rail product and weld place disclosure risk that may be present in it, to ensure reliability of the product under super-high pressure work environment, while optimizing production cost.
Description
Technical field
The present invention relates to the moldings of the moulding process of auto parts and components more particularly to a kind of oily rail of super-pressure stainless steel forging and stamping
Technique.
Background technology
The mainstream car design of existing turbocharging in-cylinder direct-jet function generally uses the operating pressure of 250bar, i.e., gasoline
Be pressurized to the liquid gaseous state of 250bar, and high speed sprays into combustor inner cylinder, with this mating fuel dispensing tube it is currently employed be not
Become rusty Steel material, and the main oily machined parts such as rail and oil injector seat are fixed into an entirety using copper brazing.Such technique
The shortcomings that be to easy to produce failure in the iterative cycles pulse that the copper brazings of different parts is under work at present pressure, and lead
Cause cracking oil leak.In order to reach the requirement being more energy-saving and environmentally friendly, country will release stringenter six discharge standard of state, in order to
This standard is adapted to, big mainstream vehicle enterprise starts to develop next-generation operating pressure bigger (hereinafter referred to as super-pressure) fuel direct injection system
System, operating pressure rise to 350bar, and the oily rail produced using current process means this operating pressure the wind of bigger
Danger, therefore, it is necessary to research and develop a kind of oily rail of integral type stainless steel forging and stamping adapting to super-high pressure work environment.
Invention content
It is an object of the invention to the deficiencies in for the above-mentioned prior art, provide a kind of oily rail of super-pressure stainless steel forging and stamping
Moulding process, with effectively evade existing soldering class stainless steel oil rail product in its weld place disclosure risk that may be present,
To ensure reliability of the product under super-high pressure work environment.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of moulding process of the oily rail of super-pressure stainless steel forging and stamping, it includes the following steps：
1) blanking, using 1.4301 low carbon stainless steels of DIN as forging and stamping raw material, chemical composition mass percent is：
C：≤ 0.07%, Si：≤ 0.7%, Mn：1-2%, Cr：15-19%, P：≤ 0.05%, Ni：7.9-10.6%；S:0.018%；
It is simulated by Forge softwares CAE, determines the length L=320mm of original bar, diameter D=34mm, and former material material will be forged and pressed
It is cut with this standard；
2) heating in medium frequency, intermediate frequency reacting furnace is put by above-mentioned original bar, is heated original bar using intermediate frequency reacting furnace
To 1150-1250 degrees Celsius；
3) blocking carries out blocking using 2500T hot die forging press to the above-mentioned bar by heating in medium frequency, and forge pressure is
1160T-1200T, initial forging temperature control in 1200-1250 degree Celsius ranges；
4) finish forge carries out finish-forging to the bar by blocking, and final forging temperature is 850-1000 degrees Celsius；
5) trimming will be placed on by the bar of finish-forging on the press machine equipped with edger, the overlap generated after removal forging and stamping,
It is required that flash thickness is no more than 2.5mm, the semi-finished product of the oily rail of super-pressure stainless steel forging and stamping are thus obtained.
6) it quenches, above-mentioned semi-finished product is quenched；
7) ball blast strengthens the surface of quenched semi-finished product using shot-blasting machine；
8) acid wash passivation carries out immersion treatment, temperature using 10% hydrochloric acid neutralizer to the semi-finished product after ball blast：60-80
Degree Celsius, the time：15-20 minutes, to remove the oxide layer of surface of semi-finished, finally obtain the oily rail of super-pressure stainless steel forging and stamping
Finished product.
Further, in step 2), original bar is heated to 1250 degrees Celsius using intermediate frequency reacting furnace.
Further, in step 6), above-mentioned semi-finished product are quenched with air-cooled mode.
The relatively existing soldering class stainless steel oil rail production of moulding process of the oily rail of super-pressure stainless steel forging and stamping proposed by the present invention
Product can creatively save the technical process such as welding, and then effectively evade existing soldering class stainless steel oil rail product in its weldering
Place disclosure risk that may be present is connect, to ensure reliability of the product under super-high pressure work environment, while optimizing life
Produce cost.
Specific implementation mode
With reference to the preferred embodiments of the present invention are described in detail in table.
The invention discloses the moulding process that a kind of super-pressure stainless steel forges and presses oily rail, it includes the following steps：
1) blanking, using (SUS 304) low carbon stainless steels of DIN 1.4301 as forging and stamping raw material, chemical composition quality
Percentage is：C：≤ 0.07%, Si：≤ 0.7%, Mn：1-2%, Cr：15-19%, P：≤ 0.05%, Ni：7.9-10.6%；
S:0.018%；Ni (nickel), Cr (chromium) are important austenitic stainless steel addition element, can effectively improve the through hardening of stainless steel
Property and corrosion resistance, so must assure that ratio, and S (sulphur) and P (phosphorus) they are harmful nonmetal inclusion elements, are easy to make steel
Brittleness is generated, and reduces the corrosion resistance of stainless steel；It is simulated by Forge softwares CAE, determines the length L=of original bar
320mm, diameter D=34mm, and forging and stamping former material material is cut with this standard determine the optimum length of original bar and straight
Diameter can improve stock utilization to greatest extent；
2) heating in medium frequency, intermediate frequency reacting furnace is put by above-mentioned original bar, is heated original bar using intermediate frequency reacting furnace
To 1150-1250 degrees Celsius, the bar heated before reaching this temperature range is all automatically fed into ash can；
3) blocking carries out blocking using 2500T hot die forging press to the above-mentioned bar by heating in medium frequency, and forge pressure is
1160T-1200T, initial forging temperature control in 1200-1250 degree Celsius ranges；
4) finish forge carries out finish-forging to the bar by blocking, and final forging temperature is 850-1000 degrees Celsius；
5) trimming will be placed on by the bar of finish-forging on the press machine equipped with edger, the overlap generated after removal forging and stamping,
It is required that flash thickness is no more than 2.5mm, the semi-finished product of the oily rail of super-pressure stainless steel forging and stamping are thus obtained.
6) it quenches, above-mentioned semi-finished product is quenched；
7) ball blast strengthens the surface of quenched semi-finished product using shot-blasting machine；
8) acid wash passivation carries out immersion treatment, temperature using 10% hydrochloric acid neutralizer to the semi-finished product after ball blast：60-80
Degree Celsius, the time：15-20 minutes, to remove the oxide layer of surface of semi-finished, finally obtain the oily rail of super-pressure stainless steel forging and stamping
Finished product.
It as shown in table 1,, will using intermediate frequency reacting furnace by test comparison in order to reach best core hardness in step 2)
Original bar is heated to 1250 degrees Celsius.
Table 1
Oily rail after finish-forging is used into three kinds of water cooling, air-cooled and quenching liquid (AQUA-QUENCH 3699C) types of cooling respectively
Quenched, by measure assess in a manner of different quenchings for the hardness distribution of material, metallographic structure variation, grain size number and
The influence that material extends.In table 2, the technology of material hardness testing result (average hardness) requires to be 139-192HB.Table 3 is Austria
The testing result (requiring >=4 grades with reference to technology) of family name's body grain size.
Table 2
Table 3
In order to adapt to mach optimal material core hardness and grain size number, in conjunction with each group of data in table 2 and table 3
Comparison, step 6) is middle to select the air-cooled means as fast cooling.
Determine in this programme the purpose of each technological parameter and its role is to：
1) the equally distributed austenite stainless steel construction of metallographic structure is obtained, grain size number reaches 6 grades or more, in favor of
Subsequent deep hole rig process；
2) before hardness, yield strength, the tensile strength of the oily rail of super-pressure stainless steel forging and stamping meet the requirements of the customers
It puts, reduces its core hardness as far as possible, in favor of machining；
3) control quenching before temperature at 850 degrees Celsius or more, can to avoid stainless steel organization internal in temperature-fall period by
The sensitizing effect that chemical reaction is brought occurs in carbon and chromium and resulting intercrystalline corrosion may.
By table 4 we it can be found that the oily rail (hereinafter referred to as " forging and stamping of the present invention obtained super-pressure stainless steel forging and stamping
Oily rail ") compared with the oily rail of existing casting, embody higher mechanical strength.
Table 4
As shown in table 5, the nitric acid using 65% does corrosion experiment as tested media to the oily rail of forging and stamping, the results showed that, forging
The average corrosion rate of pressure oil rail is 0.24g/m2* h meets GB national standards<0.66g/m2* the requirement of h, that is, forging and stamping oil rail
Resistance to corrosion be more than national standard.
Table 5
" the oily rail of forging and stamping " of the present invention has strong more than tension required under 350bar super-high pressure work environment
The mechanical performances such as degree, yield strength, the corrosion resistance being provided simultaneously under reply high temperature and high pressure environment and deep hole machining must
The austenitic structure needed；Its molding process has also evaded the leakage wind of the issuable different inter-modules of conventional brazing oil rail
Danger.
The above description of this invention and application are illustrative, are not wishing to limit the scope of the invention to above-mentioned implementation
In example；Without departing from the scope and spirit of the present invention, can to embodiments disclosed herein carry out it is other deformation and
Change.
Claims (3)
1. a kind of moulding process of the oily rail of super-pressure stainless steel forging and stamping, it is characterised in that include the following steps：
1）Blanking, using 1.4301 low carbon stainless steels of DIN as forging and stamping raw material, chemical composition mass percent is：C：≤
0.07%, Si：≤ 0.7%, Mn：1-2%, Cr：15-19%, P：≤ 0 .05%, Ni：7.9-10.6%； S: 0.018%；Pass through
The CAE simulations of Forge softwares determine length L=320mm of original bar, diameter D=34mm, and forging and stamping former material material are marked with this
Standard is cut；
2）Heating in medium frequency, intermediate frequency reacting furnace is put by above-mentioned original bar, is heated to original bar using intermediate frequency reacting furnace
1150-1250 degrees Celsius；
3）Blocking carries out blocking using 2500T hot die forging press to the above-mentioned bar by heating in medium frequency, and forge pressure is
1160T-1200T, initial forging temperature control in 1200-1250 degree Celsius ranges；
4）Finish forge carries out finish-forging to the bar by blocking, and final forging temperature is 850-1000 degrees Celsius；
5）Trimming will be placed on by the bar of finish-forging on the press machine equipped with edger, the overlap generated after removal forging and stamping, it is desirable that
Flash thickness is no more than 2.5mm, thus obtains the semi-finished product of the oily rail of super-pressure stainless steel forging and stamping；
6）Quenching, quenches above-mentioned semi-finished product, and temperature is at 850 degrees Celsius or more before control quenching；
7）Ball blast strengthens the surface of quenched semi-finished product using shot-blasting machine；
8）Acid wash passivation carries out immersion treatment, temperature using 10% hydrochloric acid neutralizer to the semi-finished product after ball blast：60-80 is Celsius
Degree, time：15-20 minutes, to remove the oxide layer of surface of semi-finished, finally obtain the oily rail of super-pressure stainless steel forging and stamping at
Product.
2. the moulding process of the oily rail of super-pressure stainless steel forging and stamping according to claim 1, it is characterised in that：Step 2）In,
Original bar is heated to 1250 degrees Celsius using intermediate frequency reacting furnace.
3. the moulding process of the oily rail of super-pressure stainless steel forging and stamping according to claim 1, it is characterised in that：Step 6）In,
Above-mentioned semi-finished product are quenched with air-cooled mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710428439.8A CN107299295B (en) | 2017-06-08 | 2017-06-08 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
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| CN201710428439.8A CN107299295B (en) | 2017-06-08 | 2017-06-08 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203790A (en) * | 2017-12-29 | 2018-06-26 | 芜湖三联锻造有限公司 | A kind of integral high pressure common rail stainless steel and its forging method |
| CN108149157A (en) * | 2017-12-29 | 2018-06-12 | 芜湖三联锻造有限公司 | A kind of stainless steel bars and its forging method |
| CN108406315A (en) * | 2018-04-27 | 2018-08-17 | 上海众源燃油分配器制造有限公司 | A kind of gasoline high pressure oil rail forging system and technique |
| CN109280759A (en) * | 2018-11-20 | 2019-01-29 | 江苏龙城精锻有限公司 | A kind of manufacturing method of integral fine crystal austenitic stainless steel hot forging |
| CN112877611A (en) * | 2019-11-29 | 2021-06-01 | 宝武特种冶金有限公司 | Austenitic stainless steel, fine-grain large-size bar and preparation method and application thereof |
| CN113231585B (en) * | 2021-04-29 | 2023-08-01 | 上海众源燃油分配器制造有限公司 | Forging process for stainless steel gasoline 500bar high-pressure oil rail |
| CN115141920B (en) * | 2022-07-06 | 2023-07-21 | 大冶特殊钢有限公司 | Induction heating heat treatment method for austenitic stainless steel bar |
| CN116274821A (en) * | 2023-04-19 | 2023-06-23 | 山东泰和能源股份有限公司 | Die forging machining method for large stainless steel workpiece |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814439A (en) * | 2012-09-10 | 2012-12-12 | 绍兴山耐高压紧固件有限公司 | Hot-forging molding process of large-sized stainless steel nut |
| CN105177264A (en) * | 2015-09-25 | 2015-12-23 | 宝钢特钢有限公司 | Manufacturing method for stainless steel forged round steel |
| CN105414444A (en) * | 2016-01-18 | 2016-03-23 | 湖北万鑫精密铸锻股份有限公司 | Forging process for integrated automobile traction support |
-
2017
- 2017-06-08 CN CN201710428439.8A patent/CN107299295B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814439A (en) * | 2012-09-10 | 2012-12-12 | 绍兴山耐高压紧固件有限公司 | Hot-forging molding process of large-sized stainless steel nut |
| CN105177264A (en) * | 2015-09-25 | 2015-12-23 | 宝钢特钢有限公司 | Manufacturing method for stainless steel forged round steel |
| CN105414444A (en) * | 2016-01-18 | 2016-03-23 | 湖北万鑫精密铸锻股份有限公司 | Forging process for integrated automobile traction support |
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