CN106670375B - The forging method of gasoline engine connecting rod - Google Patents
The forging method of gasoline engine connecting rod Download PDFInfo
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- CN106670375B CN106670375B CN201611067966.2A CN201611067966A CN106670375B CN 106670375 B CN106670375 B CN 106670375B CN 201611067966 A CN201611067966 A CN 201611067966A CN 106670375 B CN106670375 B CN 106670375B
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- parts
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- connecting rod
- forging
- gasoline engine
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- 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
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/766—Connecting rods
-
- 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
-
- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Powder Metallurgy (AREA)
Abstract
The present patent application belongs to technical field of mechanical forging, specifically discloses a kind of forging method of gasoline engine connecting rod, includes the following steps：（1）Dispensing：900 980 parts of iron, 46 parts of manganese, 8 12 parts of nickel, 20 30 parts of aluminium, 57 parts of titanium, 34 parts of silicon carbide, 23 parts of barium titanate, 12 parts of talcum powder, 12 parts of sodium silicate, 12 parts of zinc stearate, 70 85 parts of rare earth ferrosilicon are taken by quality parts ratio；（2）Mixing, grinding：Iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and rare earth ferrosilicon are carried out to be mixed to get mixture 1, mixture 1 is ground, 50 80 nm are ground to, obtains mixture 2；（3）Compacting；（4）Reheat fusing；（5）Green compact；（6）Sintering；（7）It is cooling；（8）Forging；（9）Heat treatment；（10）Surface shot blasting strengthening processing.The connecting rod that present patent application makes, effectively reduces the hole of the connecting rod of power forging, has higher intensity and anti-fatigue performance, and require enough rigidity and toughness.
Description
Technical field
The invention belongs to technical field of mechanical forging more particularly to a kind of forging methods of gasoline engine connecting rod.
Background technology
Connecting rod is the important part in automobile engine, it is connected to piston and bent axle, and effect is by the reciprocal of piston
Movement is changed into the rotary motion of bent axle, and the power acted on piston is transmitted to bent axle with output power.Connecting rod at work,
In addition to bearing the pressure that combustion chamber combustion gas generates, the inertia force of vertical and horizontal is still suffered from.Therefore, connecting rod is complicated at one
It works under stress state, its not only by the tension and compression stress of alternation but also by bending stress.The main damage forms of connecting rod are fatigue fractures
And excessive deformation.The position of usual fatigue fracture is three high stress areas on connecting rod.The operating condition of connecting rod requires to connect
Bar has higher intensity and anti-fatigue performance, and requires enough rigidity and toughness.
Connecting rod is the maximum part that meets with stresses in automobile engine, and American-European Japan and other countries successively use powder in the car
Last connecting rod rough forging, it is simple for process, and better mechanical property, quite paid close attention to by people.So-called powder forging process is exactly raw material
Powder is heated after being shaped according to the shaped compression of regulation, forged again later by improving its material density after sintering,
Realizing can be with a kind of manufacturing method for being commonly hot-forged the higher-strength being mutually equal to.Compared with other autofrettages, forged using powder
The final products for making the method manufacturing not only shape, but also productivity is also relatively strong, while finished material rate is also very high, so should
Autofrettage is chiefly used in the production-manufacturing engineering of automobile specified connecting rod.
Since the physical intensity of power forging product depends on the density of material itself, that is to say, that if powder is forged
The hole in product material is made, if stomata or gap reduce more, the intensity and toughness of product will be higher.Although powder
The connecting rod of forging produces density and is closer to materials theory density, but causes there are certain hole in the product of actual production
The connecting rod produced is without very high intensity and toughness.
Invention content
The purpose of the present invention is providing a kind of forging method of gasoline engine connecting rod, reduces the hole of the connecting rod of power forging,
Improve the intensity and toughness of product.
In order to achieve the above object, base case of the invention is：The forging method of gasoline engine connecting rod, including following step
Suddenly：
(1) dispensing：900-980 parts of iron is taken by quality parts ratio, 4-6 parts of manganese, 8-12 parts of nickel, 20-30 parts of aluminium, 5-7 parts of titanium,
3-4 parts of silicon carbide, 2-3 parts of barium titanate, 1-2 parts of talcum powder, 1-2 parts of sodium silicate, 1-2 parts of zinc stearate, rare earth ferrosilicon 70-85
Part；
(2) it mixes, grind：Iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and rare earth ferrosilicon be mixed to get mixed
Object 1 is closed, mixture 1 is ground, 50-80nm is ground to, obtains mixture 2；
(3) it suppresses：Zinc stearate, sodium silicate and the talcum powder in step (1) are added into mixture 2, in 4-5t/
cm2Pressure pushing mixture 3 is made；
(4) fusing is reheated：Whole heating is carried out to mixture 3, until 3 refuse of mixture obtains melt liquid
4；
(5) green compact：By melt liquid 4 in 6-8t/cm2Pressure under green compact obtain solid mixture 5；
(6) it is sintered：Solid mixture 5 is sintered in the sintering furnace for being connected with protective atmosphere；
(7) cooling：With the blank of rate of temperature fall cooling step (6) preparation of 20-24 DEG C/min to room temperature；
(8) it forges：Blank after cooling is sent into die of press and is forged；
(9) it is heat-treated；
(10) surface shot blasting strengthening is handled.
The advantageous effect of this base case is：The main reason for forging hole formation is interparticle incomplete overlapping
With the formation of stomata.The forging of power forging is stacked by particle to be formed, and particle is in stacking process, since deformation is not filled
Point, not exclusively overlapping is often generated, to form hole.Various raw materials are ground to Nano grade, the mechanics of material, calorifics,
Anti-wear is worn and the performances such as anticorrosive can obtain different degrees of raising, can be carried using the power forging connecting rod of Nano grade
Bond strength between high particle, lower porosity.
Mixture 3 is suppressed, then refuse is heated, and the purpose is to eliminate the hole of suppression process generation.Again it melts
Change heating and allow in mixture 3 and be easiest to the ingredient melting of fusing, the liquid phase of generation contributes to the reinforcing in diffusion process and ingredient
Infiltration so that the mixture 5 that follow-up green compact step obtains has certain contraction.The result of refuse heating makes mixture 5
In particle fine and close and more uniform tissue is become from the lamellar tissue stacked originally, hole is significantly less.And in raw material
Middle addition rare earth ferrosilicon, can further decrease the porosity of forging.This is because rare earth is surface active element, it can be dropped
The surface tension of low melt liquid improves the mobility of fusing particle, also improves interparticle mutual wetting, reduce melting
The coefficient of thermal expansion of liquid reduces internal stress, to play the effect for reducing porosity and improving consistency.It is forged with traditional powder
It makes and compares, the connecting rod forged using the technical program, porosity reduces by 60% or more, greatly improves the intensity of connecting rod and tough
Property.
Further, step (2) are mixed into：Using mixing machine by iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and
Rare earth ferrosilicon mixing 20-30min is to uniform.Above-mentioned raw materials are put into mixing machine mixing 20-30min, various raw materials can mix
More uniformly, the connecting rod quality thus forged is preferable.
Further, the zinc stearate, talcum powder grain size be 600 mesh.Zinc stearate, the talcum of step (3) addition
Powder diameter should not be too large, and 600 mesh are more suitable, can preferably be mixed, be played a role with mixture 2.
Further, the heat treatment process of step (9) is：When being heated to 850-890 DEG C of hardening heat in inert gas,
It quenches in the oil immediately, it is rear to carry out 530-560 DEG C of tempering.The heat treatment process is by changing material surface and internal metallographic group
Structure is knitted, the performance of connecting rod is effectively improved.
Specific implementation mode
Below by specific implementation mode, the present invention is described in further detail：
The forging method of gasoline engine connecting rod is described in detail by taking embodiment 1 as an example below, other embodiment and comparative example are in table 1
Middle embodiment, unshowned part are same as Example 1.
Embodiment 1
The forging method of gasoline engine connecting rod, the described method comprises the following steps：
(1) dispensing：900 parts of iron, 4 parts of manganese, 8 parts of nickel, 20 parts of aluminium, 5 parts of titanium, 3 parts of silicon carbide, metatitanic acid are taken by quality parts ratio
2 parts of barium, 1 part of talcum powder, 1 part of sodium silicate, 1 part of zinc stearate, 70 parts of rare earth ferrosilicon；
(2) it mixes, grind：Iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and rare earth ferrosilicon be mixed to get mixed
Object 1 is closed, mixture 1 is ground, 50nm is ground to, obtains mixture 2；
(3) it suppresses：Zinc stearate, sodium silicate and the talcum powder in step (1) are added into mixture 2, in 1t/cm2
Pressure pushing mixture 3 is made；
(4) fusing is reheated：Whole heating is carried out to mixture 3, until 3 refuse of mixture obtains melt liquid
4；
(5) green compact：By melt liquid 4 in 6t/cm2Pressure under green compact obtain solid mixture 5；
(6) it is sintered：Solid mixture 5 is sintered in the sintering furnace for being connected with protective atmosphere；
(7) cooling：With the blank of rate of temperature fall cooling step (6) preparation of 20-24 DEG C/min to room temperature；
(8) it forges：Blank after cooling is sent into die of press and is forged；
(9) it is heat-treated；
(10) surface shot blasting strengthening is handled.
Table 1
Various indexs, the parameter of manufactured connecting rod in embodiment 1 to comparative example 3, the result obtained such as 2 institute of table are detected respectively
Show：
Table 2
Porosity data obtains on the basis of connecting rod available on the market.
Conclusion：
1, it can be seen that from the comparison of embodiment 1 and comparative example 1 and rare earth ferrosilicon, tie rod holes obtained be added in dispensing
Gap rate substantially reduces, and connecting rod is in fatigue limit, brittleness section, the contraction percentage of area, fatigue resistance, impact flexibility and elongation percentage
Etc. greatly improve in performances.
2, it can be seen that according to the comparison of embodiment 1 and comparative example 2 and raw material is ground to Nano grade advantageously reduces company
Bar porosity, and connecting rod is in fatigue limit, brittleness section, the contraction percentage of area, fatigue resistance, impact flexibility and elongation percentage etc.
It is improved in performance.
3, the comparison of embodiment 1 and comparative example 2 is as can be seen that be added compacting and again in the forging method of gasoline engine connecting rod
The step of heating fusing, advantageously reduces connecting rod porosity, and connecting rod is in fatigue limit, brittleness section, the contraction percentage of area, antifatigue
It is improved in the performances such as intensity, impact flexibility and elongation percentage.
Claims (4)
1. the forging method of gasoline engine connecting rod, which is characterized in that the described method comprises the following steps：
（1）Dispensing：900-980 parts of iron, 4-6 parts of manganese, 8-12 parts of nickel, 20-30 parts of aluminium, 5-7 parts of titanium, carbonization are taken by quality parts ratio
3-4 parts of silicon, 2-3 parts of barium titanate, 1-2 parts of talcum powder, 1-2 parts of sodium silicate, 1-2 parts of zinc stearate, 70-85 parts of rare earth ferrosilicon；
（2）Mixing, grinding：Iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and rare earth ferrosilicon are carried out to be mixed to get mixture
1, mixture 1 is ground, 50-80 nm are ground to, obtains mixture 2；
（3）Compacting：Step is added into mixture 2（1）In zinc stearate, sodium silicate and talcum powder, in 4-5t/cm2Pressure
Mixture 3 is made in power pushing；
（4）Reheat fusing：Whole heating is carried out to mixture 3, until 3 refuse of mixture obtains melt liquid 4；
（5）Green compact：By melt liquid 4 in 6-8 t/cm2Pressure under green compact obtain solid mixture 5；
（6）Sintering：Solid mixture 5 is sintered in the sintering furnace for being connected with protective atmosphere；
（7）It is cooling：With the rate of temperature fall cooling step of 20-24 DEG C/min（6）The blank of preparation is to room temperature；
（8）Forging：Blank after cooling is sent into die of press and is forged；
（9）Heat treatment；
（10）Surface shot blasting strengthening processing.
2. the forging method of gasoline engine connecting rod as described in claim 1, which is characterized in that step（2）Be mixed into：Using mixed
Conjunction machine is by iron, manganese, nickel, aluminium, titanium, silicon carbide, barium titanate and rare earth ferrosilicon mixing 20-30min to uniform.
3. the forging method of gasoline engine connecting rod as described in claim 1, which is characterized in that the zinc stearate, talcum powder
Grain size is 600 mesh.
4. the forging method of gasoline engine connecting rod as described in claim 1, which is characterized in that step（9）Heat treatment process be：
When being heated to 850-890 DEG C of hardening heat in inert gas, quench in the oil immediately, it is rear to carry out 530-560 DEG C of tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611067966.2A CN106670375B (en) | 2016-11-28 | 2016-11-28 | The forging method of gasoline engine connecting rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611067966.2A CN106670375B (en) | 2016-11-28 | 2016-11-28 | The forging method of gasoline engine connecting rod |
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| CN106670375A CN106670375A (en) | 2017-05-17 |
| CN106670375B true CN106670375B (en) | 2018-08-03 |
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| CN201611067966.2A Active CN106670375B (en) | 2016-11-28 | 2016-11-28 | The forging method of gasoline engine connecting rod |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111390184A (en) * | 2020-04-26 | 2020-07-10 | 全椒康盛机电有限公司 | Preparation method of high-strength engine connecting rod |
| CN113953764B (en) * | 2021-10-25 | 2024-06-25 | 无锡亿臻机械有限公司 | Manufacturing method of connecting rod assembly for high-speed loom |
Citations (7)
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|---|---|---|---|---|
| CN1438346A (en) * | 2002-02-10 | 2003-08-27 | 江苏万里活塞轴瓦总厂 | Aluminum Alloy Formula for Hot Precision Forging Connecting Rod |
| CN101918162A (en) * | 2008-01-04 | 2010-12-15 | Gkn烧结金属有限公司 | Connecting rods forged with pre-alloyed copper powder |
| CN103084576A (en) * | 2013-01-22 | 2013-05-08 | 山东信义粉末冶金有限公司 | Production method of powder metallurgy hot forging connecting rod with sealed surface |
| CN103894613A (en) * | 2012-12-28 | 2014-07-02 | 大连瓦特重机床有限公司 | Powder forging process of connecting rods |
| CN103921086A (en) * | 2014-05-12 | 2014-07-16 | 临沂市金立机械有限公司 | Method for forging connecting rod of small gasoline engine |
| CN104203459A (en) * | 2012-01-30 | 2014-12-10 | 麦加戴恩国际有限公司 | Connecting rod and method of manufacturing same |
| CN105952773A (en) * | 2016-07-18 | 2016-09-21 | 安徽奥泰粉末冶金有限公司 | Powder metallurgy connecting rod for automobile engine and production method of powder metallurgy connecting rod |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007284769A (en) * | 2006-04-19 | 2007-11-01 | Toyota Motor Corp | Connecting rod manufacturing method and connecting rod |
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2016
- 2016-11-28 CN CN201611067966.2A patent/CN106670375B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1438346A (en) * | 2002-02-10 | 2003-08-27 | 江苏万里活塞轴瓦总厂 | Aluminum Alloy Formula for Hot Precision Forging Connecting Rod |
| CN101918162A (en) * | 2008-01-04 | 2010-12-15 | Gkn烧结金属有限公司 | Connecting rods forged with pre-alloyed copper powder |
| CN104203459A (en) * | 2012-01-30 | 2014-12-10 | 麦加戴恩国际有限公司 | Connecting rod and method of manufacturing same |
| CN103894613A (en) * | 2012-12-28 | 2014-07-02 | 大连瓦特重机床有限公司 | Powder forging process of connecting rods |
| CN103084576A (en) * | 2013-01-22 | 2013-05-08 | 山东信义粉末冶金有限公司 | Production method of powder metallurgy hot forging connecting rod with sealed surface |
| CN103921086A (en) * | 2014-05-12 | 2014-07-16 | 临沂市金立机械有限公司 | Method for forging connecting rod of small gasoline engine |
| CN105952773A (en) * | 2016-07-18 | 2016-09-21 | 安徽奥泰粉末冶金有限公司 | Powder metallurgy connecting rod for automobile engine and production method of powder metallurgy connecting rod |
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| CN106670375A (en) | 2017-05-17 |
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