CN107761003A - The powder metallurgy sintered method of bearing cap - Google Patents
The powder metallurgy sintered method of bearing cap Download PDFInfo
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- CN107761003A CN107761003A CN201710849567.XA CN201710849567A CN107761003A CN 107761003 A CN107761003 A CN 107761003A CN 201710849567 A CN201710849567 A CN 201710849567A CN 107761003 A CN107761003 A CN 107761003A
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- sintering
- preheating
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Abstract
The present invention relates to powder metallurgical technology, a kind of powder metallurgy sintered method of bearing cap is disclosed, the material composition of the bearing cap includes Cu, quality accounting 2 4%, C, quality accounting 0.45 0.65%, P, quality accounting 0.45 0.65%, remaining is Fe, and the sintering method is divided into warm and sintering process, the warm includes three sections of preheating temperatures, respectively 600 ± 20 DEG C of the first preheating temperature, the second 680 ± 20 DEG C of preheating temperature, the 3rd 780 ± 20 DEG C of preheating temperature；The sintering temperature of the sintering process is 1250 ± 20 DEG C.The present invention increases P element on the basis of Fe C Cu conventional materials, and is controlled by sintering temperature, improves the parameters such as its tensile strength, yield strength, elongation percentage.
Description
Technical field
The present invention relates to powder metallurgical technology, the powder metallurgy sintered method of particularly a kind of bearing cap.
Background technology
Powder metallurgical sintering process is high less than being carried out below material key component melting temperature by powder forming pressed compact
Temperature is handled, and the physical and chemical changes of a series of complex occur in some specified temp and atmosphere, it is therefore an objective to makes powder
Intergranular produces metallurgical binding, even if the crystal boundary being transformed between powder particle by mechanical engagement between atom combines.
In general powder metallurgy bearing cap product uses Fe-C-Cu materials, and atom is to particle knot under nominal sintering temperatures
Conjunction face largely migrates, spreads and flowed, and shrinks, round and smoothization and nodularization, and the product after sintering can reach material standard will
The mechanical performance asked.
The mixed powder of three kinds of different ratios of the prior art is sintered experiment respectively, the results showed that in product requirement
Under density requirements, the sintered blank that is obtained using normal sintering parameter, its tensile strength, yield strength, elongation percentage, density can not be same
When meet drawing requirement.
The content of the invention
It is an object of the invention to solve the above problems, there is provided a kind of powder metallurgy sintered method of bearing cap, in Fe-C-
Increase P element on the basis of Cu conventional materials, and controlled by sintering temperature, improve its tensile strength, yield strength, elongation percentage etc.
Parameter.
The present invention adopts the technical scheme that：
A kind of powder metallurgy sintered method of bearing cap, it is characterized in that, the material composition of the bearing cap includes Cu, matter
Accounting 2-4% is measured, C, quality accounting 0.45-0.65%, P, quality accounting 0.45-0.65%, remaining is Fe, the sintering method
It is divided into warm and sintering process, the warm includes three sections of preheating temperatures, respectively the first preheating temperature 600 ± 20
DEG C, the second 680 ± 20 DEG C of preheating temperature, the 3rd 780 ± 20 DEG C of preheating temperature；The sintering temperature of the sintering process be 1250 ±
20℃。
Further, the material composition of the bearing cap also includes adjuvant, and quality accounting is less than 2%.
Further, the sintering method is completed by push rod furnace, and the push rod furnace includes preheating part and sintering portion, institute
Stating preheating part includes the first preheating part, the second preheating part and the 3rd preheating part, and three preheating parts can set respective temperature respectively,
First preheating temperature is set in first preheating part, the second preheating temperature is set in second preheating part
Degree, the 3rd preheating temperature is set in the 3rd preheating part.
Further, the sintering portion includes the first sintering portion, the second sintering portion and the 3rd sintering portion, three sintering portions
Respective temperature can be set respectively.
Further, the push rod furnace maintains protective atmosphere, ammonolysis craft 4-7m in sintering process3/ hr, enter stove nitrogen 45-
50m3/ hr, sealing nitrogen 4-7m3/hr。
Further, fltting speed of the bearing cap in sintering process is 4 minutes/burning boat.
The beneficial effects of the invention are as follows：
(1) increase P element on the basis of Fe-C-Cu conventional materials, and controlled by sintering temperature, the tension that it is required is strong
Degree, yield strength, elongation percentage are all much higher compared with standard material；
(2) P can form clearance-type solid solution with Fe, play the effect such as solution strengthening, hole nodularization and activated sintering, add
A certain amount of P, iron-based material can be made to obtain higher intensity and hardness；
(3) it is sintered using push rod furnace, to support high temperature sintering；
(4) increase the burner hearth cooling segment length of push rod furnace, enable product temperature near room temperature after coming out of the stove, obtain normal aobvious
The good sintered part(s) of micro-structural, stable performance, repeatability, avoiding blacking aoxidizes；
Brief description of the drawings
Accompanying drawing 1 is the structural representation of bearing cap.
Embodiment
The embodiment having below in conjunction with the accompanying drawings to the powder metallurgy sintered method of bearing cap of the present invention is made specifically
It is bright.
Bearing cover material involved in the present invention is the revision of standard material, is increased on the basis of Fe-C-Cu conventional materials
Add P element, because P can form clearance-type solid solution with Fe, play the effect such as solution strengthening, hole nodularization and activated sintering.Add
Enter a certain amount of P, iron-based material can be made to obtain higher intensity and hardness, but P also tempestuously reduces plasticity and toughness simultaneously, especially
It is low-temperature flexibility, therefore to reach high intensity and high-elongation simultaneously, and conventional sintering processing is infeasible.
By the transformation to material prescription and sintering furnace, change the proportioning of mixed powder, make the product size phase after sintering
To relatively stable.It is sintered from push rod furnace, to support high temperature sintering.And increase the cooling segment length of the burner hearth of push rod furnace,
Enable product temperature near room temperature after coming out of the stove, obtain the good sintered part(s) of normal microstructure, stable performance, repeatability, keep away
Exempt from the oxidation that blacks.
The material composition (quality accounting) of powder metallurgy bearing cap is：Cu 2-4%, C 0.45-0.65%, P 0.45-
0.65%, other elements<2%, remaining as Fe.Other elements are mainly some adjuvants, for example thickener, demolding aids etc. are now
There is the adjuvant in technology.
During being heated up to push rod furnace, because within the scope of certain temperature, sintering temperature raises, atom
Propagation energy strengthens, and the formation and coarsening rate for sintering neck are accelerated, and the metallurgical binding face between particle also increases, and pore shape becomes
In rule, reduction and nodularization, the alloying level lifting of sintered body, so as to obtain the product of high intensity, high tenacity.It is final to determine
Temperature parameter be：First 600 ± 20 DEG C of preheating section, the second 680 ± 20 DEG C of preheating section, the 3rd 780 ± 20 DEG C of preheating section；Three
Preheating section carries out temperature control at three preheating positions of push rod furnace respectively, and three preheating parts can set respective temperature respectively.
Here only three preheating parts are not limited, according to the preheating part that originally need to can set more than three.Bearing cap is in three preheating parts
In with certain speed transmission after, reach predetermined temperature.
Enter sintering portion, 1250 ± 20 DEG C of sintering stage after preheating, sintering portion may also comprise the first sintering portion, the second sintering portion
With the 3rd sintering portion, three sintering portions can set respective temperature respectively.Here only three sintering portions are not limited yet, can
It is arranged as required to, the temperature in each sintering portion can also be controlled each.
In push rod furnace, protective atmosphere is set：Ammonolysis craft 4-7m3/ hr, enter stove nitrogen 45-50m3/ hr, sealing nitrogen 4-
7m3/hr.Fltting speed is 4 minutes/burning boat, burning boat here, refers to the bracket for driving powdered metal parts motion.Burn herein
Under junction parameter, all coupons meet above-mentioned mechanical performance and hardness requirement, obtain high intensity, the powder metallurgy axle of high-elongation
Hold lid.
Here the hardness requirement of design is minimum 67HRB.Different, the specific requirement according to the density of part difference part
For：Density is 6.35g/cm3When, tensile strength requires minimum 405MPa, and yield strength requires minimum 352MPa, elongation percentage requirement
Minimum is 2.0%；Density is 6.4g/cm3When, tensile strength requires minimum 414MPa, and yield strength requires minimum 355MPa, prolonged
It is at least 2.0% to stretch rate requirement；Density is 6.6g/cm3When, tensile strength requires minimum 449MPa；Yield strength requirement is minimum
369MPa, elongation percentage requirement are at least 2.5%.
The bearing cap sintered by the method for the present invention, the above-mentioned requirements being fully achieved, after testing, such as following table, institute
There is coupon to meet above-mentioned mechanical performance and hardness requirement, obtain high intensity, the powder metallurgy bearing cap of high-elongation.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
1. a kind of powder metallurgy sintered method of bearing cap, it is characterised in that：The material composition of the bearing cap includes Cu, quality
Accounting 2-4%, C, quality accounting 0.45-0.65%, P, quality accounting 0.45-0.65%, remaining is Fe, and the sintering method is divided into
Warm and sintering process, the warm include three sections of preheating temperatures, respectively 600 ± 20 DEG C of the first preheating temperature,
Second 680 ± 20 DEG C of preheating temperature, the 3rd 780 ± 20 DEG C of preheating temperature；The sintering temperature of the sintering process is 1250 ± 20
℃。
2. the powder metallurgy sintered method of bearing cap according to claim 1, it is characterised in that：The material of the bearing cap
Composition also includes adjuvant, and quality accounting is less than 2%.
3. the powder metallurgy sintered method of bearing cap according to claim 1 or 2, it is characterised in that：The sintering method
It is to be completed by push rod furnace, the push rod furnace includes preheating part and sintering portion, and the preheating part includes the first preheating part, second
Preheating part and the 3rd preheating part, three preheating parts can set respective temperature respectively, in first preheating part described in setting
First preheating temperature, second preheating temperature is set in second preheating part, institute is set in the 3rd preheating part
State the 3rd preheating temperature.
4. the powder metallurgy sintered method of bearing cap according to claim 3, it is characterised in that：The sintering portion includes the
One sintering portion, the second sintering portion and the 3rd sintering portion, three sintering portions can set respective temperature respectively.
5. the powder metallurgy sintered method of bearing cap according to claim 3, it is characterised in that：The push rod furnace is sintering
During maintain protective atmosphere, ammonolysis craft 4-7m3/ hr, enter stove nitrogen 45-50m3/ hr, sealing nitrogen 4-7m3/hr。
6. the powder metallurgy sintered method of bearing cap according to claim 3, it is characterised in that：The bearing cap is sintering
During fltting speed for 4 minutes/burn boat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710849567.XA CN107761003A (en) | 2017-09-20 | 2017-09-20 | The powder metallurgy sintered method of bearing cap |
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| CN201710849567.XA CN107761003A (en) | 2017-09-20 | 2017-09-20 | The powder metallurgy sintered method of bearing cap |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760759A (en) * | 2019-12-03 | 2020-02-07 | 德钜（厦门）特种合金制品有限公司 | Powder metallurgy sintering process for sliding block |
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Application publication date: 20180306 |