CN105039852B - Double material powder forging connecting rods of a kind of high-performance and preparation method thereof - Google Patents
Double material powder forging connecting rods of a kind of high-performance and preparation method thereof Download PDFInfo
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- CN105039852B CN105039852B CN201510272173.3A CN201510272173A CN105039852B CN 105039852 B CN105039852 B CN 105039852B CN 201510272173 A CN201510272173 A CN 201510272173A CN 105039852 B CN105039852 B CN 105039852B
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Abstract
The invention belongs to powder metallurgy automobile parts preparation field, a kind of double material powder forging connecting rod preparation methods of high-performance and low-cost.The content for containing manganese sulfide and copper and carbon in the component of the big end of connecting rod is low；Shaft is consistent with the component of small end of connecting rod, and manganese sulfide is free of in component, and the content of copper and carbon is more than the content of copper and carbon in big end.The mass percent of each component of big end：Copper 2.00 ~ 2.75%, manganese sulfide 0.30 ~ 0.34%, graphite 0.58 ~ 0.64%, lubrication 0.60 ~ 0.72%, surplus is iron；The mass percent of each component of shaft and small end of connecting rod：Copper 3.05 ~ 3.45%, graphite 0.58 ~ 0.70%, lubricant 0.60 ~ 0.72%, surplus are iron.This double material powder forging connecting rod realizes high comprehensive performance, meanwhile, forging connecting rod and traditional steel forging connecting rod compared to the powder of mono-material has apparent cost advantage.
Description
Technical field：
The invention belongs to powder metallurgy automobile part fields, specifically provide high-performance, double material automobile engines connect
Bar and its powder hotforging preparation method.
Background technology：
Double materials or more material sintered metal products（It is not to refer in particular to connecting rod）Concept just have before twenty or thirty year, in automobile
Under the driving of industry, the fast development of Powder Metallurgy Industry makes many double materials or more material sintered metal products be able to success
Exploitation.For example, the material of the sinterable hardening of the teeth portion of powder metallurgical gear, but can add needing the centre processed to select
The good material of work（Belong to conventional powder metallurgical preparation, is not related to forging technology, material is finally without completely fine and close）.Other one
The example of a powder metallurgy parts is one-way clutch ring, and inner layer material uses P/F-4665, and cladding material uses P/
F-4615 just has different hardness in different regions in this way（Belong to powder forging product）.Currently, double materials in research and development
Combination of materials further includes：Magnetic material/non-magnetic material, abrasion-resistant surface material/high bearing capacity material, inexpensive material/costliness
Material.But the existing technology for preparing powder metallurgy bi-material product is the structure for being all based on stratiform or concentric knot
Structure is unsuitable for preparing powder forging connecting rod.
The structure feature of connecting rod as shown in Figure 1, its major part needs do very multi-step process, including：（1）Grind it is two-sided at least
Once；（2）Major part endoporus is cut；（3）Drill bolt hole simultaneously beats screw thread；（4）Big alliteration is disconnected.Drill and beat screw thread and swollen disconnected major part
Require that material has good machinability.However, in actual use the major part of connecting rod substantially will not fatigue fracture, institute
With an ideal big head material should have excellent machinability and the disconnected property of expansible, but its fatigue strength is relatively secondary.It compares
Under, the bar portion processing of connecting rod is extremely simple, it is only necessary to go to dodge side and Shot Blasting, but its fatigue strength is very crucial.So
Fatigue strength should be used high in the bar portion of connecting rod, and the material that machinability is relatively low.In the prior art, many powder metallurgy
Material all has strong far more than the fatigue of the existing MPIF P/F FC-0205 materials used after obtaining ideal microstructure
Degree, but the material of these high-fatigue strengths is not used in the large-scale production of powder forging connecting rod, the reason is that it can be processed
Property is poor, of high cost and the obstacle of other technical aspects.Powder forges the required manufacturing procedure of small end of connecting rod between major part and bar portion
Between, that is to say, that after the two-sided mill of microcephaly, only internal diameter needs turnning and milling, is far less than the manufacturing procedure of stub end.Again
Bushing can be forged the method solution into expanded joint to small end of connecting rod by person, the cutter life problem of the small head end internal diameter of turnning and milling with one completely
Certainly.So small head end uses material same as bar portion, without significant counter productive.
If a double material connecting rod can be designed and be manufactured, the machinability of major part is strong, and fatigue strength is low；Its bar portion
Fatigue strength it is high, machinability is poor, has thus utilized the advantage of powder metallurgy, has also utilized each powder metallurgy material
The strong point of material, and evaded its weakness.
It is based on the above fact, applicant proposed the applications that the double material powder of this high-performance forge connecting rod patent of invention.
Invention content：
Having high comprehensive performance the purpose of the present invention is to provide a kind of（The machinability of major part part is strong, and fatigue is strong
It spends slightly lower；The fatigue strength of bar portion is high, and machinability is slightly poor）The composition design and system of the automobile engine powder forging connecting rod of low cost
Preparation Method.
The present invention is realized by following technical solution：A kind of double material powder forging connecting rods of high-performance, connecting rod includes connecting
Bar major part, shaft and small end of connecting rod contain manganese sulfide and copper in the component of the big end and the content of carbon are low；It is described
Shaft is consistent with the component of small end of connecting rod, is free of manganese sulfide in component, and the content of copper and carbon is more than copper and carbon in big end
Content.
Further, the mass percent of each component of the big end：Copper 2.00-2.75%, manganese sulfide 0.30-
0.34%, graphite 0.58-0.64%, lubricant 0.60-0.72%, surplus are iron；
The mass percent of each component of the shaft and small end of connecting rod：Copper 3.05-3.45%, graphite 0.58-0.70%,
Lubricant 0.60-0.72%, surplus are iron.
It is a further object of the present invention to provide the preparation methods that the double material powder of above-mentioned high-performance forge connecting rod, specifically include following
Step：
Step 1. dispensing：
According to the mass percent of each component of big end：Copper 2.00-2.75%, manganese sulfide 0.30-0.34%, graphite
0.58-0.64%, lubricant 0.60-0.72%, surplus are iron；
The mass percent of each component of shaft and small end of connecting rod：Copper 3.05-3.45%, graphite 0.58-0.70%, lubrication
Agent 0.60-0.72%, surplus are iron；Each raw material is weighed respectively, is uniformly mixed respectively, and the feeder with 2 powder feeding pipes is added
In, it is spare；
Step 2. feeds：
The material baffle that a piece of thickness is 0.127 mm is welded on powder-feeding shoe, the powder-feeding shoe is placed in the upper end of middle film
On face, the position of the material baffle is made to be in the low punch of big end and the die parting line portion of the low punch of shaft and small end of connecting rod
Position,（As shown in Figure 2）Major part tube cell will be sent to be placed in the big end of separated material version side above membrane cavity, bar portion tube cell will be sent
It is placed in the bar portion of the separated material version other side above die cavity,（Shown in Fig. 3）Start feeder, two different premixing flours are existed
It has been filled into the middle mould die cavity being made of die cavity in membrane cavity in big end and bar portion under conditions of normal continuous production,
It is spare；
Step 3. pre-molding and surface densification：
The middle mould equipped with powder that step 2 obtains is subjected to pre-molding, the pressure of precompressed is 300-600 MPa, is obtained
Pre-press carries out ungrease treatment rear surface to pre-press and is densified by shot-peening；
Step 4. sintering hot forging and post-processing
The pre-press that step 3 is obtained at 1100-1250 DEG C, is sintered 8-15 minutes in reducing atmosphere, will be sintered pre-
Casting die is put into hot forging in die cavity, and mould-cavity temperature is 150-250 DEG C in hot forging, clicks forging in air atmosphere, goes to dodge after forging
Side；Ball blast removes surface oxide layer and strengthening surface；Two-sided mill is not less than 7.80 g/ cm to get to consistency3High-performance
Double material powder forge connecting rod.
Further, the case hardness of the double material powder forging connecting rods of the high-performance is 32-38Rc, and tensile strength reaches 1100-
1250 MPa, tensile yield strength reach 810-860 MPa, and fatigue limit intensity reaches 407 MPa.
The beneficial effects of the invention are as follows：Due to the adoption of the above technical scheme, the features of the present invention is as follows：
1. microstructure, the minimum that the sampling of metallographic specimen comes from the bar portion of mono-material connecting rod and double material connecting rods is transversal
At area, measure that the results are shown in Table 1.
The metallurgical performance of 1 liang of class connecting rod of table
| Performance | Unit | Mono-material connecting rod | Double material connecting rods |
| Amplification 10 times when porosity | N/A | Nothing | Nothing |
| Oxidation depth | mm | 0.07-0.09 | 0.04-0.05 |
| Total decarburized depth | mm | 0.16-0.19 | 0.04-0.07 |
| Ferrite content | % | 25-30 | 5-8 |
| Case hardness | Rc | 29-35 | 32-38 |
In contrast, " material of big end "（Rc 29-35）It is lower than the hardness (Rc 32-38) of " material of shaft ".
The microstructure of " material of big end " and " material of shaft " is respectively displayed in 4 (a) and (b), they have following spy
Sign：
(1) microstructure of the microstructure ratio " material of big end " of " material of shaft " is fine and smooth；
(2) " material of shaft " does not contain manganese sulfide particle, but " material of big end " has manganese sulfide particle.
2. material transition region
Double material connecting rods are cut along three orientation " A " shown in fig. 5, " B " and " C ", section passes through material transition area
Domain, after making metallographic specimen, polishing, polishing, shown in Corrosion results such as Fig. 6 (a), 6 (b) and 6 (c), under high magnification microscope
Observation, material transition region are thought as shown in fig. 7, because in the interface of two kinds of materials not finding apparent defect
Hidden danger is not present in mechanical strength at material transition.
2.1. material transition boundary line
Two different premixing flours are in short distance（Such as within the scope of 5 mm）Mixing simultaneously forms zigzag boundary line and is
Useful and harmless, however the mixing of long range（Such as it has been more than 5 mm）It is then possible in terms of generating machinability or intensity
The problem of, such as, if bar portion premixing flour enters at the major part of pre-press, as shown in fig. 6, subsequent mill is two-sided and vehicle
It will feel that machinability decreases when cutting major part internal diameter, eliminate and mix over long distances and control zigzag boundary line at material transition
（As shown in Figure 6 and Figure 7）The most effective method of size is suction-type filler, and suction-type filler is not attempt to be because of optimization herein
The two kinds of materials crossed do not bring hell and high water at material transition for producing double material connecting rods to production.
2.2. material mutual compatibility
The zigzag interface shown in Fig. 6 and Fig. 7 provides additional interlocking intensity, material mistake shown in Fig. 7 to interface
Branch-cut bridge is clear, shows that the diffusion length of alloying element is not far.
Since the chemical composition of two kinds of materials is different, their coefficient of thermal expansion and contraction and phase transformation temperature points difference,
There is no problem at high temperature for these differences, but in cooling procedure after forging, if these differences have exceeded certain limit,
It is possible to crack along material transition boundary line.However for ingredient, optimum preparation condition described in this patent application
The big head material and bar portion material crossed, experiment test find that the shearing stress that this is applied for a patent at the material transition of design is not enough to
It cracks.
In addition, if small head material is different from bar portion material, above-mentioned institute is intelligent to be suitable for microcephaly's transition position.
3. mechanical testing results
Mechanical testing results are as shown in table 2, and the tensile strength and tensile yield strength of double material connecting rods are than conventional single material
30% and 33% has been respectively increased in matter connecting rod, this raising is very valuable for link design engineer, however double material connecting rods
Elongation reduce 40% than conventional mono-material connecting rod, illustrate that pair bar portion material of material connecting rods is more crisp.
The mechanical performance of 2 two kinds of connecting rods of table
| Performance | Unit | Mono-material connecting rod | Double material connecting rods | It is promoted, % |
| Tensile strength | MPa | 885-925 | 1100-1250 | 30 |
| Tensile yield strength（0.2%） | MPa | 618-638 | 810-860 | 33 |
| Elongation | % | 15-17 | 8-11 | -40 |
| Elasticity modulus | GPa | 200-207 | 200-207 | 0 |
| Fatigue limit intensity * | MPa | 310 | 407 | 31 |
*:Testing fatigue is carried out using ChangAn Automobile H16 powder forging connecting rod.
It has been more than 10 in addition to those load apply cycle7Still except the connecting rod not being broken, mono-material connecting rod and double materials
Matter connecting rod is ruptured around in the smallest cross-section area of bar portion, as shown in table 2, the fatigue endurance limit phase of double material connecting rods
For mono-material connecting rod lifting 31%, this is the invention patent bright spot the most notable and encouraging.
4. cost
For auto industry, cost is most important competive factor under the premise of performance and guaranteed quality, because
It is higher for bar portion material phosphorus content selected herein, thus it is more slightly higher than conventional mono-material major part material cost, but increase bar
The copper content in portion is worth, because of expensive material（Copper content is high）It solely has been used in the bar portion needed most, furthermore, manganese sulfide
Grain from rejected in bar portion material also counteract a part due to high cost caused by copper content height.
As summary, this double material powder forging connecting rod patent realizes high comprehensive performance, moreover, than the high-performance of mono-material
Connecting rod has apparent cost advantage.
Description of the drawings：
Fig. 1 is that the double material powder of high-performance of the present invention forge the structural schematic diagram of connecting rod.
Fig. 2 is the structural schematic diagram of the powder-feeding shoe of the present invention.
Fig. 3 is the dust feeder overall structure diagram of the present invention.
Fig. 4 is the light micrograph of the connecting rod of the present invention,（a）The microcosmic structure of stub end；(b) bar portion is micro-
See structure.In contrast, not only microstructure is thick for big head material, and contains manganese sulfide particle（Arrow is signified）, bar portion material
The microstructure of material is tiny, and without manganese sulfide particle.
Fig. 5 is the transition region sample position schematic diagram of double material connecting rods of the present invention.
Fig. 6 is three sections of Fig. 5（" A ", " B ", " C) on different materials transition position metallurgical structure optics
Microphoto.
Fig. 7 is the zigzag transition wire and metallurgical structure in the material transition region of the double material connecting rods of high-performance of the present invention
Light micrograph.
In figure：
1. big end, 2. shafts, 3. material baffles, die cavity in 4., mould in 5., 6. powder-feeding shoes, 7- send major part tube cell, 8.
Sending bar portion tube cell, 9. material feeding shoe arms, die cavity in 10. major parts, die cavity in 11. bar portions, 12. scrape powder baffle, 13. major part powders,
14. bar portion powder, 15. low punches.
Specific implementation mode：
Technical scheme of the present invention is described further with reference to specific embodiment.
As shown in Figure 1, the present invention illustrates that a kind of double material powder of high-performance forge connecting rods, connecting rod include big end, shaft and
Small end of connecting rod contains manganese sulfide and copper in the component of the big end and the content of carbon is low；The shaft and small end of connecting rod
Component it is consistent, manganese sulfide is free of in component, the content of copper and carbon is more than the content of copper and carbon in big end, and the connecting rod is big
The mass percent of each component of head：Copper 2.00-2.75%, manganese sulfide 0.30-0.34%, graphite 0.58-0.64%, lubricant
0.60-0.72%, surplus are iron；
The mass percent of each component of the shaft and small end of connecting rod：Copper 3.05-3.45%, graphite 0.58-0.70%,
Lubricant 0.60-0.72%, surplus are iron.
A kind of preparation method of the double material powder forging connecting rods of high-performance, specifically includes following steps：
Step 1. dispensing：
According to the mass percent of each component of big end：Copper 2.00-2.75%, manganese sulfide 0.30-0.34%, graphite
0.58-0.64%, lubricant 0.60-0.72%, surplus are iron；
The mass percent of each component of shaft and small end of connecting rod：Copper 3.05-3.45%, graphite 0.58-0.70%, lubrication
Agent 0.60-0.72%, surplus are iron；Each raw material is weighed respectively, is uniformly mixed respectively, and the feeder with 2 powder feeding pipes is added
In, it is spare；
Step 2. feeds：
The material baffle that a piece of thickness is 0.127 mm is welded on powder-feeding shoe, the powder-feeding shoe is placed in the upper end of middle film
On face, the position of the material baffle is made to be in the low punch of big end and the die parting line portion of the low punch of shaft and small end of connecting rod
Position,（As shown in Figure 2）Major part tube cell will be sent to be placed in the big end of separated material version side above membrane cavity, bar portion tube cell will be sent
It is placed in the bar portion of the separated material version other side above die cavity,（Shown in Fig. 3）Start feeder, two different premixing flours are existed
It has been filled into the middle mould die cavity being made of die cavity in membrane cavity in big end and bar portion under conditions of normal continuous production,
It is spare；
Step 3. pre-molding and surface densification：
The middle mould equipped with powder that step 2 obtains is subjected to pre-molding, the pressure of precompressed is 300-600 MPa, is obtained
Pre-press carries out ungrease treatment rear surface to pre-press and is densified by shot-peening；
Step 4. sintering hot forging and post-processing
The pre-press that step 3 is obtained is sintered at being 1100-1250 DEG C in temperature, and sintering time is 8-15 minutes, will be burnt
Pre-press after knot is put into hot forging in die cavity, is 150-250 DEG C in temperature, is clicked forging in air atmosphere, go to dodge after forging
Side；Ball blast removes surface oxide layer and strengthening surface；Two-sided mill is not less than 7.80 g/ cm to get to consistency3High-performance
Double material powder forge connecting rod.
Embodiment 1：
Step 1 dispensing：
The mass percent of each component of big end：Copper 2.25%, manganese sulfide 0.34%, graphite 0.64%, lubricant
0.72%, surplus is iron；
The mass percent of each component of shaft and small end of connecting rod：Copper 3.45%, graphite 0.70%, lubricant 0.72%, it is remaining
Amount is iron, and above-mentioned raw materials are uniformly mixed respectively,
Step 2. feeds：
The material baffle that a piece of thickness is 0.127 mm is welded on powder-feeding shoe, the powder-feeding shoe is placed in the upper end of middle film
On face, the position of the material baffle is made to be in the low punch of big end and the die parting line portion of the low punch of shaft and small end of connecting rod
Position,（As shown in Figure 2）Major part tube cell will be sent to be placed in the big end of separated material version side above membrane cavity, bar portion tube cell will be sent
It is placed in the bar portion of the separated material version other side above die cavity,（Shown in Fig. 3）Start feeder, two different premixing flours are existed
It has been filled into the middle mould die cavity being made of die cavity in membrane cavity in big end and bar portion under conditions of normal continuous production,
It is spare；
Step 3. pre-molding and surface densification：
The middle mould equipped with powder that step 2 obtains is subjected to pre-molding, the pressure of precompressed is 300-600 MPa, is obtained
Pre-press carries out ungrease treatment rear surface to pre-press and is densified by shot-peening；
Step 4. sintering hot forging and post-processing
The pre-press that step 3 is obtained, in the case where temperature is 1100 DEG C, sintering time is 8-15 minutes, by precompressed after sintering
Being put into hot forging in die cavity for part, is 150-250 DEG C in temperature, forging is clicked in air atmosphere, goes to dodge side after forging；Ball blast
Remove surface oxide layer and strengthening surface；Two-sided mill to get to case hardness be 32-38Rc, tensile strength 1100-1250
MPa, tensile yield strength 810-860 MPa, elongation 8-11%, 407 MPa of fatigue limit intensity, consistency are not less than
7.80 g/ cm3The double material powder of high-performance forge connecting rods.
The physical property of 3 two kinds of premixing flours of table
| Performance | Unit | Major part premixing flour | Bar portion premixing flour |
| Flow velocity | second/50g | 31.8 | 31.9 |
| Apparent density | g/cm3 | 3.17 | 3.19 |
| It is pressed into 6.8 g/cm3Required forming pressure | MPa | 468 | 445 |
| Density is 6.8 g/cm3When green strength | MPa | 8.23 | 8.15 |
| Density is 6.8 g/cm3When demoulding rebound | % | 0.15 | 0.14 |
| Density is 6.8 g/cm3When sintering after TRS | MPa | 854 | 840 |
| Density is 6.8 g/cm3When sintered dimensions variation | % | 0.67 | 0.68 |
| Density is 6.8 g/cm3When sintered hardness | HRB | 72 | 77 |
Embodiment 2：
Step 1. dispensing：
The mass percent of each component of big end：Copper 2.00%, manganese sulfide 0.30%, graphite 0.58%, lubricant
0.60%, surplus is iron；
The mass percent of each component of shaft and small end of connecting rod：Copper 3.05%, graphite 0.58%, lubricant 0.60%, it is remaining
Amount is iron.And be uniformly mixed each raw material respectively according to the component of major part part, bar portion and microcephaly part, bitubular feeding is added
It is spare in machine；
Step 2. feeds：
The material baffle that a piece of thickness is 0.127 mm is welded on powder-feeding shoe, the powder-feeding shoe is placed in the upper end of middle film
On face, the position of the material baffle is made to be in the low punch of big end and the die parting line portion of the low punch of shaft and small end of connecting rod
Position,（As shown in Figure 2）Major part tube cell will be sent to be placed in the big end of separated material version side above membrane cavity, bar portion tube cell will be sent
It is placed in the bar portion of the separated material version other side above die cavity,（Shown in Fig. 3）Start feeder, two different premixing flours are existed
It has been filled into the middle mould die cavity being made of die cavity in membrane cavity in big end and bar portion under conditions of normal continuous production,
It is spare；
Step 3. pre-molding and surface densification：
The middle mould equipped with powder that step 2 obtains is subjected to pre-molding, the pressure of precompressed is 600 MPa, obtains precompressed
Part carries out ungrease treatment rear surface to pre-press and is densified by shot-peening；
Step 4. sintering hot forging and post-processing：
The pre-press that step 3 is obtained, in the case where temperature is 1250 DEG C, sintering time is 8-15 minutes, by precompressed after sintering
Part is put into hot forging in die cavity, is 150-250 DEG C in temperature, forging is clicked in air atmosphere, go to dodge side after forging；Ball blast is gone
Except surface oxide layer and strengthening surface；Two-sided mill to get to case hardness be 32-38Rc., tensile strength 1100-1250
MPa, tensile yield strength 810-860 MPa, 407 MPa of fatigue limit intensity, consistency are not less than 7.80 g/ cm3Height
The double material powder of performance forge connecting rod.
Claims (1)
1. a kind of preparation process of the double material powder forging connecting rods of high-performance, which is characterized in that specifically include following steps：
The mass percent of big end each component：Copper 2.00%, manganese sulfide 0.30%, graphite 0.58%, lubricant 0.60%, it is remaining
Amount is iron；
The mass percent of each component of shaft and small end of connecting rod：Copper 3.05%, graphite 0.58%, lubricant 0.60%, surplus are
Iron；
And be uniformly mixed each raw material respectively according to the component of major part part, bar portion and microcephaly part, bitubular feeder is added
In, it is spare；
Step 2. feeds：
The material baffle that a piece of thickness is 0.127 mm is welded on powder-feeding shoe, the powder-feeding shoe is placed in the upper surface of middle film
On, so that the position of the material baffle is in the low punch of big end and the die parting line portion of the low punch of shaft and small end of connecting rod
Position will send major part tube cell to be placed in the big end of separated material version side above membrane cavity, will send bar portion tube cell be placed in it is described every
Expect in the bar portion of the version other side above die cavity, to start feeder, by two different premixing flours in normal quantity-produced item
It has been filled under part in the middle die cavity being made of die cavity in membrane cavity in big end and bar portion, it is spare；
Step 3. pre-molding and surface densification：
The middle mould equipped with powder that step 2 obtains is subjected to pre-molding, the pressure of precompressed is 600 MPa, obtains pre-press, right
Pre-press carries out ungrease treatment rear surface and is densified by shot-peening；
Step 4. sintering hot forging and post-processing：
The pre-press that step 3 is obtained, in the case where temperature is 1250 DEG C, sintering time is 8-15 minutes, and pre-press after sintering is put
Enter in hot forging in die cavity, is 150-250 DEG C in temperature, forging is clicked in air atmosphere, go to dodge side after forging；Ball blast removes surface
Oxide layer and strengthening surface；Two-sided mill stretches to get being 32-38Rc, tensile strength 1100-1250 MPa to case hardness
Yield strength 810-860 MPa, 407 MPa of fatigue limit intensity, consistency are not less than 7.80 g/ cm3The double materials of high-performance
Powder forges connecting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510272173.3A CN105039852B (en) | 2015-05-25 | 2015-05-25 | Double material powder forging connecting rods of a kind of high-performance and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510272173.3A CN105039852B (en) | 2015-05-25 | 2015-05-25 | Double material powder forging connecting rods of a kind of high-performance and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105039852A CN105039852A (en) | 2015-11-11 |
| CN105039852B true CN105039852B (en) | 2018-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108127122A (en) * | 2017-12-04 | 2018-06-08 | 西安交通大学 | A kind of double material sinter soging parts of composite construction enhancing and preparation method thereof |
| CN110203712A (en) * | 2019-04-26 | 2019-09-06 | 湖南中冶长天重工科技有限公司 | A kind of solder type roller arm and its welding positioning tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040134306A1 (en) * | 2003-01-14 | 2004-07-15 | Fuping Liu | Bi-material connecting rod |
| US20070261514A1 (en) * | 2006-04-13 | 2007-11-15 | Geiman Timothy E | Multi-material connecting rod |
| CN103084576B (en) * | 2013-01-22 | 2016-12-28 | 山东信义粉末冶金有限公司 | A kind of production method of the Powder Metal Forged Connecting Rods of sealing surfaces |
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