CN106868397A - A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum and preparation method thereof - Google Patents
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum and preparation method thereof Download PDFInfo
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- CN106868397A CN106868397A CN201710212370.5A CN201710212370A CN106868397A CN 106868397 A CN106868397 A CN 106868397A CN 201710212370 A CN201710212370 A CN 201710212370A CN 106868397 A CN106868397 A CN 106868397A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/10—Drums for externally- or internally-engaging brakes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.2‑3.6%、Si：3‑3.5%、Mn：0.3‑0.5%、Pb：0.2‑0.4%、Cr:0.25‑0.35%、TC：0.01‑0.03%、Bi：0.003‑0.005%、Nb：0.02‑0.04%、Tb:0.4‑0.6%、V：0.3‑0.5%、P：0.01‑0.02%、S：0.01 0.02%, remaining is Fe.The carbon equivalent of the high-toughness heat-resistant vermicular cast iron automobile brake drum is 3.36 3.88%.The nodulizing rate of the high-toughness heat-resistant vermicular cast iron automobile brake drum is 75 80%.The brake drum that the present invention is obtained has good thermal conductivity, elevated temperature strength, high temperature abrasion resistance and thermal fatigue resistance, Pb, Cr, Tc, Bi, Nb, Tb, the addition of V element, intensity, hardness and tissue can be effectively improved, in addition, high-temperature stability also increases, and can increase substantially braking safety and service life.
Description
Technical field
The present invention relates to technical field of automobile, specifically a kind of high-toughness heat-resistant vermicular cast iron automobile brake drum and its
Preparation method.
Background technology
At present, the extraordinary emergence of auto output brings the flourishing and confusion in auto parts machinery market, and automobile brake drum is vapour
One strength member of car running gear, it belongs to a part for axle assembly.It is reported that, the service life of brake drum is because of road travel permit
Part is different, whether overload, driver's operating habit and manufacturing firm's difference have very big difference.In general, to car, if
Genuine is configured, and service life can be more than 100,000 kilometers, and if component market configuration, often only 50,000 kilometers；It is former to truck
Factory's configuration is even more more up to ten thousand kilometers of 3-5, and the drum of component market is then mostly below 30,000 kilometers, even less than 10,000 public affairs
In.
The frequent replacing of brake drum not only wastes substantial amounts of financial resources, material resources, is made more frighteningly in vehicle traveling process
Dynamic drum failure is likely to result in the serious accident of car crash, therefore improves brake drum material, improves service life and using reliable
Property, should be the corporation responsibility of automobile and foundry industry.
Mentioned above, the initial failure reason in 30,000 kilometers of brake drum is mainly cracking and is cracked, next to that breaking off the base；Produce
Raw the reason for the failing that break off the base is clearer, is exactly unqualified material, and tensile strength is too low, or local wall thickness size is excessively thin.And open
Splitting or being cracked is caused because of thermal shock, and during automobile brake, huge braking thermic load and thermal shock make to be produced on brake drum
Very big thermograde, causes thermal stress very high；It is enough to because the huge heat energy that braking is produced can also produce friction zone again
Cause the high temperature of phase transformation, cause to produce transformation stress.The presence of thermal stress and transformation stress so that the mechanical property of material is uneven
Even, under frequently brake load, change is cracked.In interrupted or sequential like more than these crackles, and constantly extend and reticulate
（Cracking）, crackle is wide and long when serious, as ftractures.
At present, the material of domestic production automobile brake drum, general using gray cast iron material manufacture, gray cast iron has excellent
Thermal conductance, low elastic modelling quantity, good shock absorption, intensity higher and preferable wearability, and cheap price, but
With the speed-raising of automobile and being continuously increased for capacity, make motor racing kinetic energy into geometric growth, produced during brake
Thermal shock also increase substantially therewith so that brake drum initial failure takes place frequently, cracking cracking increases sharply, to the driving safety of automobile
There are larger hidden danger.
The content of the invention
It is an object of the invention to provide a kind of high-toughness heat-resistant vermicular cast iron automobile brake drum and preparation method thereof, to solve
The problem proposed in certainly above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.2-3.6%、
Si：3-3.5%、Mn：0.3-0.5%、Pb：0.2-0.4%、Cr:0.25-0.35%、TC：0.01-0.03%、Bi：0.003-
0.005%、Nb：0.02-0.04%、Tb:0.4-0.6%、V：0.3-0.5%、P：0.01-0.02%、S：0.01-0.02%, remaining is
Fe。
As further scheme of the invention：The high-toughness heat-resistant vermicular cast iron automobile brake drum, by following weight hundred
Point ratio into being grouped into：C：3.3-3.5%、Si：3.1-3.4%、Mn：0.35-0.45%、Pb：0.25-0.35%、Cr:0.28-
0.32%、TC：0.015-0.025%、Bi：0.0035-0.0045%、Nb：0.025-0.035%、Tb:0.45-0.55%、V：0.35-
0.45%、P：0.012-0.018%、S：0.012-0.018%, remaining is Fe.
As further scheme of the invention：The high-toughness heat-resistant vermicular cast iron automobile brake drum, by following weight hundred
Point ratio into being grouped into：C：3.4%、Si：3.3%、Mn：0.4%、Pb：0.3%、Cr:0.3%、TC：0.02%、Bi：0.004%、Nb：
0.03%、Tb:0.5%、V：0.4%、P：0.015%、S：0.015%, remaining is Fe.
As further scheme of the invention：The carbon equivalent of the high-toughness heat-resistant vermicular cast iron automobile brake drum is
3.36-3.88%。
As further scheme of the invention：The nodulizing rate of the high-toughness heat-resistant vermicular cast iron automobile brake drum is 75-
80%。
The preparation method of the high-toughness heat-resistant vermicular cast iron automobile brake drum, comprises the following steps that：
（1）Dispensing is carried out according to above-mentioned percentage by weight；
（2）The good high-toughness heat-resistant vermicular cast iron automobile brake drum raw material of dispensing is added to the sense that temperature is 1450-1550 DEG C
Fusing obtains molten iron in answering electric furnace；
（3）By cast treatment bag baking, then the vermiculizer of weight of molten iron 0.8-1.2%, weight of molten iron 1-1.4% inovulants are put
It is placed in the tamping of bag bottom；
（4）Being poured into the molten iron after electric induction furnace melting using the method that pours in cast treatment bag breed for the first time, and molten iron falls
The temperature for entering cast treatment bag is 1420-1460 DEG C；
（5）Preheated mold is to 200-300 DEG C, step（4）In tap a blast furnace after skim, ladle be transported to pouring truck cast brake drum,
During cast, the inovulant of weight of molten iron 0.5-0.7% being added again with stream, being bred for the second time, molten iron pours into preheating
The temperature of mould is 800-1000 DEG C；
（6）Extrusion casint production brake drum casting is carried out, injection ratio pressure is 80-120MPa, and pressurization time is 80-90ms, extruding
Speed is respectively 0.3-0.5m/s, and the one cycle time is 120s；
（7）At the end of cast matched moulds, the brake drum casting to not solidifying completely carries out quick Quench, and cooling velocity is controlled in 350-
450 DEG C/s, brake drum casting is taken out in then die sinking；High temperature solid solution heat treatment is carried out again, and solid solubility temperature is controlled at 450-550 DEG C,
Soaking time is 3-5h；Then hardening treatment is carried out, after hardening terminates, Ageing Treatment is re-started, aging temp is 200-210
DEG C, soaking time 10-20h；
（8）By brake drum product is obtained after machining.
As further scheme of the invention：The vermiculizer is made up of the component of following percetage by weight：Rare earth 20-
30%th, rhenium 8-10%, magnesium 4-6%, aluminium 3-5%, silicon 20-30%, calcium 1-2%, strontium 1-2%, balance of iron and impurity.
As further scheme of the invention：The inovulant is made up of the component of following percetage by weight：Silicon 60-
70%th, calcium 0.5-1%, aluminium 1-3%, barium 0.1-0.5%, balance of iron and impurity.
Compared with prior art, the beneficial effects of the invention are as follows：
The brake drum that the present invention is obtained has good thermal conductivity, elevated temperature strength, high temperature abrasion resistance and a thermal fatigue resistance, Pb,
Cr, Tc, Bi, Nb, Tb, the addition of V element, can effectively improve intensity, hardness and tissue, in addition, high-temperature stability has also been carried
Height, can increase substantially braking safety and service life.
Specific embodiment
The technical scheme of this patent is described in more detail with reference to specific embodiment.
Embodiment 1
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.2%、Si：3%、
Mn：0.3%、Pb：0.2%、Cr:0.25%、TC：0.01%、Bi：0.003%、Nb：0.02%、Tb:0.4%、V：0.3%、P：0.01%、
S：0.01%, remaining is Fe.
The preparation method of the high-toughness heat-resistant vermicular cast iron automobile brake drum, comprises the following steps that：
（1）Dispensing is carried out according to above-mentioned percentage by weight；
（2）The good high-toughness heat-resistant vermicular cast iron automobile brake drum raw material of dispensing is added to the electric induction furnace that temperature is 1450 DEG C
Middle fusing obtains molten iron；
（3）By cast treatment bag baking, the vermiculizer of weight of molten iron 0.8%, the inovulant of weight of molten iron 1% are then positioned over bag bottom
Tamping；The vermiculizer is made up of the component of following percetage by weight：Rare earth 20%, rhenium 8%, magnesium 4%, aluminium 3%, silicon 20%, calcium
1%th, strontium 1%, balance of iron and impurity；The inovulant is made up of the component of following percetage by weight：Silicon 60%, calcium 0.5%,
Aluminium 1%, barium 0.1%, balance of iron and impurity；
（4）Being poured into the molten iron after electric induction furnace melting using the method that pours in cast treatment bag breed for the first time, and molten iron falls
The temperature for entering cast treatment bag is 1420 DEG C；
（5）Preheated mold is to 200 DEG C, step（4）In tap a blast furnace after skim, ladle be transported to pouring truck cast brake drum, cast
During, add the inovulant of weight of molten iron 0.5% again with stream, bred for the second time, molten iron pours into the temperature of preheated mold
Spend is 800 DEG C；
（6）Extrusion casint production brake drum casting is carried out, injection ratio pressure is 80MPa, and pressurization time is 80ms, extrusion speed difference
It is 0.3m/s, the one cycle time is 120s；
（7）At the end of cast matched moulds, the brake drum casting to not solidifying completely carries out quick Quench, and cooling velocity is controlled 350
DEG C/s, then mold and take out brake drum casting；High temperature solid solution heat treatment is carried out again, and solid solubility temperature is controlled in 450 DEG C, soaking time
It is 3h；Then hardening treatment is carried out, after hardening terminates, Ageing Treatment is re-started, aging temp is 200 DEG C, soaking time
10h；
（8）By brake drum product is obtained after machining.
Embodiment 2
A kind of tough Heat-Resistant Compacted Graphite Iron automobile brake drum, by following percentage by weight into being grouped into：C：3.4%、Si：3.3%、
Mn：0.4%、Pb：0.3%、Cr:0.3%、TC：0.02%、Bi：0.004%、Nb：0.03%、Tb:0.5%、V：0.4%、P：0.015%、
S：0.015%, remaining is Fe.
The preparation method of the high-toughness heat-resistant vermicular cast iron automobile brake drum, comprises the following steps that：
（1）Dispensing is carried out according to above-mentioned percentage by weight；
（2）The good high-toughness heat-resistant vermicular cast iron automobile brake drum raw material of dispensing is added to the electric induction furnace that temperature is 1500 DEG C
Middle fusing obtains molten iron；
（3）By cast treatment bag baking, the vermiculizer of weight of molten iron 1%, the inovulant of weight of molten iron 1.2% are then positioned over bag bottom
Tamping；The vermiculizer is made up of the component of following percetage by weight：Rare earth 25%, rhenium 9%, magnesium 5%, aluminium 4%, silicon 25%, calcium
1.5%th, strontium 1.5%, balance of iron and impurity；The inovulant is made up of the component of following percetage by weight：Silicon 65%, calcium
0.8%th, aluminium 2%, barium 0.3%, balance of iron and impurity；
（4）Being poured into the molten iron after electric induction furnace melting using the method that pours in cast treatment bag breed for the first time, and molten iron falls
The temperature for entering cast treatment bag is 1440 DEG C；
（5）Preheated mold is to 250 DEG C, step（4）In tap a blast furnace after skim, ladle be transported to pouring truck cast brake drum, cast
During, add the inovulant of weight of molten iron 0.6% again with stream, bred for the second time, molten iron pours into the temperature of preheated mold
Spend is 900 DEG C；
（6）Extrusion casint production brake drum casting is carried out, injection ratio pressure is 100MPa, and pressurization time is 85ms, extrusion speed point
Not Wei 0.4m/s, the one cycle time be 120s；
（7）At the end of cast matched moulds, the brake drum casting to not solidifying completely carries out quick Quench, and cooling velocity is controlled 400
DEG C/s, then mold and take out brake drum casting；High temperature solid solution heat treatment is carried out again, and solid solubility temperature is controlled in 500 DEG C, soaking time
It is 4h；Then hardening treatment is carried out, after hardening terminates, Ageing Treatment is re-started, aging temp is 205 DEG C, soaking time
15h；
（8）By brake drum product is obtained after machining.
Embodiment 3
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.6%、Si：
3.5%、Mn：0.5%、Pb：0.4%、Cr:0.35%、TC：0.03%、Bi：0.005%、Nb：0.04%、Tb:0.6%、V：0.5%、P：
0.02%、S：0.02%, remaining is Fe.
The preparation method of the high-toughness heat-resistant vermicular cast iron automobile brake drum, comprises the following steps that：
（1）Dispensing is carried out according to above-mentioned percentage by weight；
（2）The good high-toughness heat-resistant vermicular cast iron automobile brake drum raw material of dispensing is added to the electric induction furnace that temperature is 1550 DEG C
Middle fusing obtains molten iron；
（3）By cast treatment bag baking, the vermiculizer of weight of molten iron 1.2%, the inovulant of weight of molten iron 1.4% are then positioned over bag
Bottom consolidates；The vermiculizer is made up of the component of following percetage by weight：Rare earth 30%, rhenium 10%, magnesium 6%, aluminium 5%, silicon
30%th, calcium 2%, strontium 2%, balance of iron and impurity；The inovulant is made up of the component of following percetage by weight：Silicon 70%,
Calcium 1%, aluminium 3%, barium 0.5%, balance of iron and impurity；
（4）Being poured into the molten iron after electric induction furnace melting using the method that pours in cast treatment bag breed for the first time, and molten iron falls
The temperature for entering cast treatment bag is 1460 DEG C；
（5）Preheated mold is to 300 DEG C, step（4）In tap a blast furnace after skim, ladle be transported to pouring truck cast brake drum, cast
During, add the inovulant of weight of molten iron 0.7% again with stream, bred for the second time, molten iron pours into the temperature of preheated mold
Spend is 1000 DEG C；
（6）Extrusion casint production brake drum casting is carried out, injection ratio pressure is 120MPa, and pressurization time is 90ms, extrusion speed point
Not Wei 0.5m/s, the one cycle time be 120s；
（7）At the end of cast matched moulds, the brake drum casting to not solidifying completely carries out quick Quench, and cooling velocity is controlled 450
DEG C/s, then mold and take out brake drum casting；High temperature solid solution heat treatment is carried out again, and solid solubility temperature is controlled in 550 DEG C, soaking time
It is 5h；Then hardening treatment is carried out, after hardening terminates, Ageing Treatment is re-started, aging temp is 210 DEG C, soaking time
20h；
（8）By brake drum product is obtained after machining.
Embodiment 4
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.3%、Si：
3.1%、Mn：0.35%、Pb：0.25%、Cr:0.28%、TC：0.015%、Bi：0.0035%、Nb：0.025%、Tb:0.45%、V：
0.35%、P：0.012%、S：0.012%, remaining is Fe.
Embodiment 5
A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, by following percentage by weight into being grouped into：C：3.5%、Si：
3.4%、Mn：0.45%、Pb：0.35%、Cr:0.32%、TC：0.025%、Bi：0.0045%、Nb：0.035%、Tb:0.55%、V：
0.45%、P：0.018%、S：0.018%, remaining is Fe.
The brake drum that the present invention is obtained has good thermal conductivity, elevated temperature strength, high temperature abrasion resistance and thermal fatigue resistance,
Pb, Cr, Tc, Bi, Nb, Tb, the addition of V element, can effectively improve intensity, hardness and tissue, in addition, high-temperature stability is also
Improve, braking safety and service life can be increased substantially.
The better embodiment to this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
Formula, in the ken that one skilled in the relevant art possesses, can also be on the premise of this patent objective not be departed from
Various changes can be made.
Claims (8)
1. a kind of high-toughness heat-resistant vermicular cast iron automobile brake drum, it is characterised in that by following percentage by weight into being grouped into：
C：3.2-3.6%、Si：3-3.5%、Mn：0.3-0.5%、Pb：0.2-0.4%、Cr:0.25-0.35%、TC：0.01-0.03%、Bi：
0.003-0.005%、Nb：0.02-0.04%、Tb:0.4-0.6%、V：0.3-0.5%、P：0.01-0.02%、S：0.01-0.02%,
Remaining is Fe.
2. high-toughness heat-resistant vermicular cast iron automobile brake drum according to claim 1, it is characterised in that by following weight hundred
Point ratio into being grouped into：C：3.3-3.5%、Si：3.1-3.4%、Mn：0.35-0.45%、Pb：0.25-0.35%、Cr:0.28-
0.32%、TC：0.015-0.025%、Bi：0.0035-0.0045%、Nb：0.025-0.035%、Tb:0.45-0.55%、V：0.35-
0.45%、P：0.012-0.018%、S：0.012-0.018%, remaining is Fe.
3. high-toughness heat-resistant vermicular cast iron automobile brake drum according to claim 1, it is characterised in that by following weight hundred
Point ratio into being grouped into：C：3.4%、Si：3.3%、Mn：0.4%、Pb：0.3%、Cr:0.3%、TC：0.02%、Bi：0.004%、Nb：
0.03%、Tb:0.5%、V：0.4%、P：0.015%、S：0.015%, remaining is Fe.
4. according to any described high-toughness heat-resistant vermicular cast iron automobile brake drums of claim 1-3, it is characterised in that the height
The carbon equivalent of tough Heat-Resistant Compacted Graphite Iron automobile brake drum is 3.36-3.88%.
5. according to any described high-toughness heat-resistant vermicular cast iron automobile brake drums of claim 1-3, it is characterised in that the height
The nodulizing rate of tough Heat-Resistant Compacted Graphite Iron automobile brake drum is 75-80%.
6. the preparation method of a kind of high-toughness heat-resistant vermicular cast iron automobile brake drum as described in claim 1-3 is any, it is special
Levy and be, comprise the following steps that：
（1）Dispensing is carried out according to above-mentioned percentage by weight；
（2）The good high-toughness heat-resistant vermicular cast iron automobile brake drum raw material of dispensing is added to the sense that temperature is 1450-1550 DEG C
Fusing obtains molten iron in answering electric furnace；
（3）By cast treatment bag baking, then the vermiculizer of weight of molten iron 0.8-1.2%, weight of molten iron 1-1.4% inovulants are put
It is placed in the tamping of bag bottom；
（4）Being poured into the molten iron after electric induction furnace melting using the method that pours in cast treatment bag breed for the first time, and molten iron falls
The temperature for entering cast treatment bag is 1420-1460 DEG C；
（5）Preheated mold is to 200-300 DEG C, step（4）In tap a blast furnace after skim, ladle be transported to pouring truck cast brake drum,
During cast, the inovulant of weight of molten iron 0.5-0.7% being added again with stream, being bred for the second time, molten iron pours into preheating
The temperature of mould is 800-1000 DEG C；
（6）Extrusion casint production brake drum casting is carried out, injection ratio pressure is 80-120MPa, and pressurization time is 80-90ms, extruding
Speed is respectively 0.3-0.5m/s, and the one cycle time is 120s；
（7）At the end of cast matched moulds, the brake drum casting to not solidifying completely carries out quick Quench, and cooling velocity is controlled in 350-
450 DEG C/s, brake drum casting is taken out in then die sinking；High temperature solid solution heat treatment is carried out again, and solid solubility temperature is controlled at 450-550 DEG C,
Soaking time is 3-5h；Then hardening treatment is carried out, after hardening terminates, Ageing Treatment is re-started, aging temp is 200-210
DEG C, soaking time 10-20h；
（8）By brake drum product is obtained after machining.
7. the preparation method of high-toughness heat-resistant vermicular cast iron automobile brake drum according to claim 6, it is characterised in that institute
Vermiculizer is stated to be made up of the component of following percetage by weight：Rare earth 20-30%, rhenium 8-10%, magnesium 4-6%, aluminium 3-5%, silicon 20-
30%th, calcium 1-2%, strontium 1-2%, balance of iron and impurity.
8. the preparation method of high-toughness heat-resistant vermicular cast iron automobile brake drum according to claim 6, it is characterised in that institute
Inovulant is stated to be made up of the component of following percetage by weight：Silicon 60-70%, calcium 0.5-1%, aluminium 1-3%, barium 0.1-0.5%, it is remaining
Measure is iron and impurity.
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| CN201710212370.5A CN106868397A (en) | 2017-04-01 | 2017-04-01 | A kind of high-toughness heat-resistant vermicular cast iron automobile brake drum and preparation method thereof |
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Cited By (1)
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| CN110331331A (en) * | 2019-07-26 | 2019-10-15 | 天津达祥精密工业有限公司 | A kind of high silicon molybdenum ferrite Heat-Resistant Compacted Graphite Iron and the preparation method and application thereof |
Citations (5)
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