CN110242381A - A kind of manufacturing method of automobile engine inlet valve - Google Patents
A kind of manufacturing method of automobile engine inlet valve Download PDFInfo
- Publication number
- CN110242381A CN110242381A CN201910508116.9A CN201910508116A CN110242381A CN 110242381 A CN110242381 A CN 110242381A CN 201910508116 A CN201910508116 A CN 201910508116A CN 110242381 A CN110242381 A CN 110242381A
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- Prior art keywords
- inlet valve
- friction
- manufacturing
- automobile engine
- nitriding
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 31
- 239000000956 alloy Substances 0.000 claims abstract description 31
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 8
- 238000005121 nitriding Methods 0.000 claims description 35
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 229910052746 lanthanum Inorganic materials 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 229910052715 tantalum Inorganic materials 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 229910052725 zinc Inorganic materials 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A kind of manufacturing method of automobile engine inlet valve, a kind of manufacturing method of automobile engine inlet valve, the following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, inlet valve bar portion is ferrous alloy, prepare the identical ferrous alloy barred body of diameter and titanium-base alloy barred body first, two barred bodies carry out friction welding, the present invention embodies the requirement to inlet valve different piece to material property using two kinds of alloys of unlike material, it is very short using the friction welding (FW) whole flow process time, but the strength demand head high temperature resistant demand of bar portion is met, it forges to brake again using first top in friction-welding technique and is further continued for the step of top is forged, it ensure that the setting time of the tissue of weld bond.
Description
Technical field
The present invention relates to a kind of manufacturing method of automobile engine inlet valve, belongs to technical field of automobile engine.
Background technique
Valve is one of key part of engine, it is the direct part for opening or closing inlet and outlet road.Valve
It is divided into inlet valve and exhaust valve, air is entered in cylinder by inlet valve to be mixed and burned with fuel, is generated after burning
Cylinder is discharged by exhaust valve in exhaust gas, to realize that fresh air enters power and exclusion that cylinder combustion generates vehicle driving
Exhaust gas.And for material performance requirement and difference, bar portion needs preferably wear-resisting for head and bar portion in engine art valve
Property, and head needs better mechanical performance and heat-resisting quantity, and the inlet valve of prior art homogenous material production is with high costs,
And it is not able to satisfy requirement of the fast-developing engine for its higher performance.
Summary of the invention
The present invention provides a kind of manufacturing method of internal combustion engine inlet valve to solve the above-mentioned problems,
A kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1200-1250rpm, friction pressure 20-25MPa, friction welding 8-10s, friction feed speed is 0.6-
0.8mm/s；Subsequent revolving speed increases to 1800-1900rpm, friction pressure 70-80MPa, friction welding 10-20s, friction feed speed
Degree is 0.4-0.5mm/s, applies the upsetting force of 120-140MPa later, 2 seconds rear brakings is kept, in the upset of 120-140MPa
Apply 8-10s, forge length 2.5-3mm under pressure again, obtained welding barred body is wanted according to inlet valve head and bar portion size
It asks and is machined out molding, obtain inlet valve blank, ferrous alloy element mass percentage are as follows: C 0.04-0.06%, Co 3-
8%, W 2-4%, Zn 0.6-0.8%, Ni 0.4-0.6%, Mg 0.1-0.4%, Ta 0.07-0.09%, Y 0.04-0.05%, La
0.03-0.04%, Nb 0.02-0.04%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.2-0.4MPa, injecting time 10-15min, air velocity 500-600m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 100-120mL/min, ammonia flow 60-
80mL/min, workpiece bias are -150V~-200V, and in-furnace temperature is controlled at 150-180 DEG C, nitriding 3-5 hours, right after nitriding
Inlet valve is heat-treated, and final inlet valve is obtained.
The manufacturing method of a kind of automobile engine inlet valve, first with revolving speed 1200rpm, friction pressure
25MPa, friction welding 8s, friction feed speed are 0.8mm/s.
A kind of manufacturing method of automobile engine inlet valve, subsequent revolving speed increase to 1800rpm, friction pressure
80MPa, friction welding 10s, friction feed speed are 0.4mm/s.
A kind of manufacturing method of automobile engine inlet valve applies the upsetting force of 120MPa, after being kept for 2 seconds
Brake, applies 10s, forge length 3mm again under the upsetting force of 120MPa.
A kind of manufacturing method of automobile engine inlet valve, ferrous alloy element mass percentage are as follows: C
0.05%, Co 5%, W 3%, Zn 0.6%, Ni 0.5%, Mg 0.2%, Ta 0.07%, Y 0.04%, La 0.04%, Nb 0.02%,
Surplus is Fe.
A kind of manufacturing method of automobile engine inlet valve, injection air pressure are 0.3MPa, and injecting time is
10min.Air velocity is 500m/s.
A kind of manufacturing method of automobile engine inlet valve, nitrogen flow 100mL/min, ammonia flow
70mL/min。
A kind of manufacturing method of automobile engine inlet valve, in-furnace temperature are controlled at 180 DEG C, nitriding 3 hours.
A kind of manufacturing method of automobile engine inlet valve, injection air pressure are 0.3MPa, and injecting time is
10min.Air velocity is 500m/s.
Titanium alloy element mass percentage are as follows: Ni 0.8-1%, Mo 0.6-0.8%, V 0.5-0.6%, Cr 0.3-
0.4%, B 0.1-0.2%, Mn 0.07-0.09%, Ca 0.06-0.07%, Mg 0.04-0.05%, Bi 0.02-0.04%, La
0.01-0.02%, surplus Ti；
The beneficial effects of the present invention are: the present invention is embodied to inlet valve different piece using two kinds of alloys of unlike material to material
Expect the requirement of performance, it is very short using the friction welding (FW) whole flow process time, but met the strength demand head high temperature resistant of bar portion
Demand, forges to brake again in friction-welding technique and is further continued for the step of top is forged using first top, when ensure that the solidification of the tissue of weld bond
Between, welding process is more easier to control setting rate, and weld bond nondestructive inspection is without exception；The present invention uses particle bead blasted surfaces nanometer
Change processing+plasma nitriding processing improves nitriding layer nitriding efficiency, and nitriding structure is more uniform, improves the wear-resisting of its surface
Property and hardness.
Specific embodiment
Embodiment 1
A kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1200rpm, friction pressure 20MPa, friction welding 9s, friction feed speed is 0.6mm/s；Subsequent revolving speed increases
To 1900rpm, friction pressure 75MPa, friction welding 15s, friction feed speed is 0.4mm/s, applies the top of 130MPa later
Forging force keeps 2 seconds rear brakings, applies 8-s, forge length 2.5mm, obtained welding again under the upsetting force of 130MPa
Barred body requires to be machined out molding, obtains inlet valve blank, ferrous alloy member quality according to inlet valve head and bar portion size
Measure percentage composition are as follows: C 0.04%, Co 6%, W 4%, Zn 0.7%, Ni 0.5%, Mg 0.3%, Ta 0.09%, Y 0.04%, La
0.035%, Nb 0.02%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.2MPa, injecting time 10min, air velocity 600m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 100mL/min, ammonia flow 70mL/
Min, workpiece bias are -160V, and in-furnace temperature controls at 150 DEG C, nitriding 3 hours, is heat-treated, obtains to inlet valve after nitriding
To final inlet valve.
Embodiment 2
A kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1220rpm, friction pressure 25MPa, friction welding 10s, friction feed speed is 0.8mm/s；Subsequent revolving speed increases
1850rpm, friction pressure 80MPa, friction welding 12s are added to, friction feed speed is 0.5mm/s, applies 120MPa's later
Upsetting force keeps 2 seconds rear brakings, applies 9s, forge length 3mm, obtained welding again under the upsetting force of 120MPa
Barred body requires to be machined out molding, obtains inlet valve blank, ferrous alloy member quality according to inlet valve head and bar portion size
Measure percentage composition are as follows: C 0.06%, Co 4%, W 4%, Zn 0.6%, Ni 0.5%, Mg 0.2%, Ta 0.07%, Y 0.04%, La
0.04%, Nb 0.02%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.4MPa, injecting time 12min, air velocity 600m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 120mL/min, ammonia flow 80mL/
Min, workpiece bias are -180V, and in-furnace temperature controls at 160 DEG C, nitriding 4 hours, is heat-treated, obtains to inlet valve after nitriding
To final inlet valve.
Embodiment 3
A kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1250rpm, friction pressure 24MPa, friction welding 8s, friction feed speed is 0.7mm/s；Subsequent revolving speed increases
To 1880rpm, friction pressure 78MPa, friction welding 16s, friction feed speed is 0.4mm/s, applies the top of 125MPa later
Forging force keeps 2 seconds rear brakings, applies 8s, forge length 3mm, obtained solder bar again under the upsetting force of 125MPa
Body requires to be machined out molding, obtains inlet valve blank, ferrous alloy element quality according to inlet valve head and bar portion size
Percentage composition are as follows: C 0.05%, Co 5%, W 2%, Zn 0.8%, Ni 0.6%, Mg 0.3%, Ta 0.08%, Y 0.04%, La
0.03%, Nb 0.025%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.35MPa, injecting time 12min, air velocity 550m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 120mL/min, ammonia flow 60mL/
Min, workpiece bias are -150V, and in-furnace temperature controls at 170 DEG C, nitriding 5 hours, is heat-treated, obtains to inlet valve after nitriding
To final inlet valve.
Embodiment 4
A kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1230rpm, friction pressure 20MPa, friction welding 10s, friction feed speed is 0.8mm/s；Subsequent revolving speed increases
1820rpm, friction pressure 80MPa, friction welding 12s are added to, friction feed speed is 0.4mm/s, applies 135MPa's later
Upsetting force keeps 2 seconds rear brakings, applies 8s, forge length 3mm, obtained welding again under the upsetting force of 135MPa
Barred body requires to be machined out molding, obtains inlet valve blank, ferrous alloy member quality according to inlet valve head and bar portion size
Measure percentage composition are as follows: C 0.03%, Co 3%, W 2%, Zn 0.7%, Ni 0.4%, Mg 0.3%, Ta 0.07%, Y 0.04%, La
0.03%, Nb 0.02%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.2MPa, injecting time 15min, air velocity 580m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 110mL/min, ammonia flow 70mL/
Min, workpiece bias are -180V, and in-furnace temperature controls at 160 DEG C, nitriding 4 hours, is heat-treated, obtains to inlet valve after nitriding
To final inlet valve.
1 weld bond mechanics properties testing result of table
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Hardness HB | 325 | 327 | 328 | 323 |
| Charpy-V impact power J | 110 | 108 | 104 | 107 |
| Weld bond ultrasonic examination | It is without exception | It is without exception | It is without exception | It is without exception |
Test result before and after 2 Nitrizing Treatment of table:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Without Nitrizing Treatment | |
| Hardness HRC | 65 | 65 | 65 | 67 | 58 |
| 500 revs/min of wear rate %, 350 Ns of loads, sliding distance 40mm | 3.0 | 3.1 | 3.2 | 3.1 | 5.8 |
The above description of the embodiments is intended to facilitate those skilled in the art to understand and apply the invention.It is ripe
The personnel for knowing art technology obviously easily can make various modifications to these embodiments, and general original described herein
It ought to use in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to embodiment here, abilities
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (5)
1. a kind of manufacturing method of automobile engine inlet valve,
The following steps are included: inlet valve includes head portion that and engine valve stem, wherein inlet valve head is titanium alloy, air inlet door rod
Portion is ferrous alloy, and the identical ferrous alloy barred body of preparation diameter and titanium-base alloy barred body, two barred bodies carry out friction welding first:
First with revolving speed 1200-1250rpm, friction pressure 20-25MPa, friction welding 8-10s, friction feed speed is 0.6-
0.8mm/s；Subsequent revolving speed increases to 1800-1900rpm, friction pressure 70-80MPa, friction welding 10-20s, friction feed speed
Degree is 0.4-0.5mm/s, applies the upsetting force of 120-140MPa later, 2 seconds rear brakings is kept, in the upset of 120-140MPa
Apply 8-10s, forge length 2.5-3mm under pressure again, obtained welding barred body is wanted according to inlet valve head and bar portion size
It asks and is machined out molding, obtain inlet valve blank, ferrous alloy element mass percentage are as follows: C 0.04-0.06%, Co 3-
8%, W 2-4%, Zn 0.6-0.8%, Ni 0.4-0.6%, Mg 0.1-0.4%, Ta 0.07-0.09%, Y 0.04-0.05%, La
0.03-0.04%, Nb 0.02-0.04%, surplus Fe,
The processing of particle bead blasted surfaces nanosizing is carried out to engine valve stem, jet angle is 70 ° -90 °, and bullet diameter is 0.1-0.4mm,
Injection air pressure be 0.2-0.4MPa, injecting time 10-15min, air velocity 500-600m/s,
Inlet valve club head without nitriding is covered, puts the workpiece in plasma heating furnace, is evacuated to 10Pa or less
Plasma nitriding processing is carried out afterwards, and nitriding medium is nitrogen and ammonia, nitrogen flow 100-120mL/min, ammonia flow 60-
80mL/min, workpiece bias are -150V~-200V, and in-furnace temperature is controlled at 150-180 DEG C, nitriding 3-5 hours, right after nitriding
Inlet valve is heat-treated, and final inlet valve is obtained.
2. a kind of manufacturing method of automobile engine inlet valve as claimed in claim 2 is rubbed first with revolving speed 1200rpm
Pressure 25MPa, friction welding 8s are wiped, friction feed speed is 0.8mm/s.
3. a kind of manufacturing method of automobile engine inlet valve as described in claim 1, subsequent revolving speed increase to
1800rpm, friction pressure 80MPa, friction welding 10s, friction feed speed are 0.4mm/s.
4. a kind of manufacturing method of automobile engine inlet valve as described in claim 1, applies the upsetting force of 120MPa,
2 seconds rear brakings are kept, apply 10s, forge length 3mm again under the upsetting force of 120MPa.
5. a kind of manufacturing method of automobile engine inlet valve as described in claim 1, ferrous alloy element quality percentage
Content are as follows: C 0.05%, Co 5%, W 3%, Zn 0.6%, Ni 0.5%, Mg 0.2%, Ta 0.07%, Y 0.04%, La 0.04%,
Nb 0.02%, surplus Fe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910508116.9A CN110242381B (en) | 2017-05-24 | 2017-05-24 | Manufacturing method of intake valve for automobile engine |
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|---|---|---|---|
| CN201710375277.6A CN107060934B (en) | 2017-05-24 | 2017-05-24 | A kind of automobile engine inlet valve |
| CN201910508116.9A CN110242381B (en) | 2017-05-24 | 2017-05-24 | Manufacturing method of intake valve for automobile engine |
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| CN201710375277.6A Division CN107060934B (en) | 2017-05-24 | 2017-05-24 | A kind of automobile engine inlet valve |
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| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
| CN112318077A (en) * | 2020-11-04 | 2021-02-05 | 安福锦湖(湖南)气门有限公司 | Manufacturing method of intake valve for automobile engine |
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| CN107639341A (en) * | 2017-11-14 | 2018-01-30 | 吉林大学 | High-performance spin friction Welding for different alloys |
| CN108942114B (en) * | 2018-08-29 | 2020-07-07 | 江苏长龄液压股份有限公司 | Production method of oil cylinder of tensioning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111015110A (en) * | 2019-12-23 | 2020-04-17 | 西部金属材料股份有限公司 | Preparation method of metal pipe fitting difficult to deform |
| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
| CN112318077A (en) * | 2020-11-04 | 2021-02-05 | 安福锦湖(湖南)气门有限公司 | Manufacturing method of intake valve for automobile engine |
Also Published As
| Publication number | Publication date |
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| CN107060934B (en) | 2019-09-13 |
| CN107060934A (en) | 2017-08-18 |
| CN110242381B (en) | 2021-09-24 |
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