CN109468525A - A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell - Google Patents
A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell Download PDFInfo
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- CN109468525A CN109468525A CN201811171405.6A CN201811171405A CN109468525A CN 109468525 A CN109468525 A CN 109468525A CN 201811171405 A CN201811171405 A CN 201811171405A CN 109468525 A CN109468525 A CN 109468525A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
- C22C33/12—Making cast-iron alloys including procedures for adding magnesium by fluidised injection
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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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, is related to iron casting production technical field.The following steps are included: raw material melting, impurity removing, constituent analysis, ingredient supplement, compactedization breed, molten iron deslagging, moulding by casting, cooling and shaping, calcination processing, knockout handle, carbo-nitriding.The present invention adds a variety of chemical components in molten iron raw material, keep the intensity of ironcasting obtained high and toughness height, and carbon and nitrogen are mixed in Iron Casting Surface by way of carbo-nitriding, by being precisely controlled to pressure, temperature and speed, make that Iron Casting Surface wearability obtained is good, anti-fatigue performance is good.
Description
Technical field
The present invention relates to iron casting production technical fields, and in particular to a kind of wear-resisting vermicular cast iron of BK series brake body shell
Part casting technique.
Background technique
Brake is with the device for making moving component deceleration, stopping or keep the functions such as halted state, is made in machinery
Movement parts stop or slow down machine components.It is commonly called as brake, lock.Currently, brake body shell is all made of gray cast iron material.
Vermicular cast iron mechanical property is between gray cast iron and spheroidal graphite cast-iron, the relatively common ash of the sensitivity profile of vermicular cast iron
Cast iron is much smaller, therefore the mechanical property on its thick big section is still relatively uniform.The prominent advantage of vermicular cast iron is that yield tensile ratio is being cast
Highest in alloy is made, thermal conductivity and thermal fatigue resistance are more much higher than spheroidal graphite cast-iron.Anti- growth and the more other castings of inoxidizability
Iron is all high.Machinability is better than spheroidal graphite cast-iron, and casting character is less than ball close to low trade mark gray cast iron, shrinkage cavity and porosity tendency
Black cast iron, therefore casting technique is fairly simple.
Show in actual use at present with vermicular cast iron produce gray cast iron production brake body shell wearability compared with
Difference.Since serious wear if itself wearability is poor seriously affects brake to brake body shell under long-time service
Service life brings biggish trouble to user.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of wear-resisting pieces of vermicular cast iron founder of BK series brake body shell
Skill, the present invention add a variety of chemical components in molten iron raw material, keep the intensity of ironcasting obtained high and toughness height, and pass through
The mode of carbo-nitriding mixes carbon and nitrogen in Iron Casting Surface, by being precisely controlled to pressure, temperature and speed, makes obtained
Iron Casting Surface wearability is good, anti-fatigue performance is good.
In order to achieve the above object, technical solution of the present invention is achieved by the following technical programs:
A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, comprising the following steps:
(1) raw materials such as the Q10 pig iron, spring steel, electrolytic manganese and compacted iron foundry returns are added in smelting furnace, and are warming up to 1540-
1560 DEG C of progress meltings clean after melting 50-60min, and sample and carry out spectrum analysis to the chemical component of its alloy, point
Analysis detects the content of each ingredient, adds manganese iron, tin iron, graphitization carburant and 90 silicon carbide according to testing result, continues melting
It is spare that molten iron is obtained after 10-20min；
(2) one layer of vermiculizer is covered at ladle bottom, and covers one layer of silicon barium calcium inovulant on it, keep the temperature of molten iron to be
1530-1540 DEG C, the molten iron added in above-mentioned steps (1) carries out compactedization inoculation, after molten iron is added completely into, in its liquid
One layer of silicon barium calcium inovulant is covered on face, then covers one layer of vermiculizer on it, carries out secondary compactedization inoculation；
(3) molten iron after molten iron compactedization in above-mentioned steps (2) being bred 30-60s, after being bred by ceramic filter to compactedization
It removes the gred, the molten iron casting after slagging-off is intracavitary to the brake body shell type for being preheated to 1390-1410 DEG C, duration of pouring control
In 4-6min, it is spare that ironcasting first product is obtained after being cooled to room temperature；
(4) the ironcasting first product in above-mentioned steps (3) is placed in tempering furnace, and keeps the temperature 2-2.5h after being warming up to 540-560 DEG C,
Knockout processing is carried out after being cooled to room temperature, and it is spare to obtain ironcasting finished product；
(5) the ironcasting finished product in above-mentioned steps (4) is put into drop control shaft furnace and carries out carbo-nitriding, be warming up to 860-880
DEG C, and it is passed through ammonia into drop control shaft furnace, so that the air in furnace is all discharged, keeping the air pressure in furnace is 0.3-
0.4MPa, then kerosene is slowly added dropwise stops being added dropwise after pressure maintaining permeation 3.5-4h, slow cooling and decompression obtains product.
Preferably, in step (1) each material composition mass percent are as follows: Q10 pig iron 37-41%, spring steel 25-29%,
Electrolytic manganese 0.8-1.2%, compacted iron foundry returns 23-27%, manganese iron 4.3-4.7%, tin iron 0.3-0.7%, graphitization carburant 1.2-
1.8%, 90 silicon carbide 1.2-1.8%.
Preferably, molten iron is made of according to mass percent following chemical component in step (1): C 3.3-3.7%, Mn
3.3-3.7%, Si 1.0-1.4%, Sn 0.05-0.3%, S 0.02-0.03%, P 0.1-0.2%, surplus Fe.
Preferably, graphitization carburant is made of according to mass percent following chemical component in step (1): C 98-
99%、S 0.05-0.1%、P 0.8-1.2%。
Preferably, vermiculizer is consisted of the following compositions according to mass percent in step (2): rare earth 9-11%, Mg 4-6%,
Si 38-42%、Fe 38-44%、Sr 1.8-2.2%、In 1.5-2.5%。
Preferably, silicon barium calcium inovulant is made of according to mass percent following chemical component in step (2): Si 38-
42%、Ba 18-22%、Ca 12-16%、Bi 1.4-1.8%、V 0.4-0.6%、Mo 0.7-0.9%、Co 0.8-1.0%、W 1.4-
1.6%, remaining is Fe.
Preferably, in step (2) vermiculizer and each additional amount of inovulant be respectively molten steel quality 0.4-0.6% and
0.3-0.5%。
Preferably, ammonia is passed through with the speed of 420-440L/h in step (4), coal is added dropwise with the speed of 8-10 mL/min
Oil.
The present invention provides a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, excellent compared with prior art
Point is:
(1) present invention adds the chemical components such as Mn and Sn in molten iron raw material, keeps the intensity of ironcasting obtained high and toughness height,
Shock resistance is good, while carbon-gathered stabilization when eutectic in austenite will not be spread, and improves the stability of pearlite, has
Effect improves the wearability and fatigue resistance of product, is easy to use；
(2) present invention mixes carbon and nitrogen in Iron Casting Surface by the way of carbo-nitriding, passes through after ironcasting casting
Pressure, temperature and speed are precisely controlled, make that Iron Casting Surface wearability obtained is good, anti-fatigue performance is good；
(3) present invention above and below molten iron by covering one layer of vermiculizer and inovulant, to carry out two to molten iron
Secondary compactedization inoculation, while molten iron being enabled to obtain uniform compactedization inoculation, high treating effect, ironcasting performance
It is high.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to the embodiment of the present invention pair
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Embodiment 1:
A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, comprising the following steps:
(1) raw materials such as the Q10 pig iron, spring steel, electrolytic manganese and compacted iron foundry returns are added in smelting furnace, and are warming up to 1540-
1560 DEG C of progress meltings clean after melting 50-60min, and sample and carry out spectrum analysis to the chemical component of its alloy, point
Analysis detects the content of each ingredient, adds manganese iron, tin iron, graphitization carburant and 90 silicon carbide according to testing result, continues melting
It is spare that molten iron is obtained after 10-20min；
(2) one layer of vermiculizer is covered at ladle bottom, and covers one layer of silicon barium calcium inovulant on it, keep the temperature of molten iron to be
1530-1540 DEG C, the molten iron added in above-mentioned steps (1) carries out compactedization inoculation, after molten iron is added completely into, in its liquid
One layer of silicon barium calcium inovulant is covered on face, then covers one layer of vermiculizer on it, carries out secondary compactedization inoculation；
(3) molten iron after molten iron compactedization in above-mentioned steps (2) being bred 30-60s, after being bred by ceramic filter to compactedization
It removes the gred, the molten iron casting after slagging-off is intracavitary to the brake body shell type for being preheated to 1390-1410 DEG C, duration of pouring control
In 4-6min, it is spare that ironcasting first product is obtained after being cooled to room temperature；
(4) the ironcasting first product in above-mentioned steps (3) is placed in tempering furnace, and keeps the temperature 2-2.5h after being warming up to 540-560 DEG C,
Knockout processing is carried out after being cooled to room temperature, and it is spare to obtain ironcasting finished product；
(5) the ironcasting finished product in above-mentioned steps (4) is put into drop control shaft furnace and carries out carbo-nitriding, be warming up to 860-880
DEG C, and it is passed through ammonia into drop control shaft furnace, so that the air in furnace is all discharged, keeping the air pressure in furnace is 0.3-
0.4MPa, then kerosene is slowly added dropwise stops being added dropwise after pressure maintaining permeation 3.5-4h, slow cooling and decompression obtains product.
Wherein, in step (1) each material composition mass percent are as follows: the Q10 pig iron 37%, spring steel 29%, electrolytic manganese
0.8%, compacted iron foundry returns 25%, manganese iron 4.7%, tin iron 0.5%, graphitization carburant 1.2%, 90 silicon carbide 1.8%；In step (1)
Molten iron is made of according to mass percent following chemical component: C 3.3%, Mn 3.7%, Si 1.0%, Sn 0.2%, S 0.02%, P
0.1%, surplus Fe；Graphitization carburant is made of according to mass percent following chemical component in step (1): C 98-99%,
S 0.05-0.1%,P 0.8-1.2%；Vermiculizer is consisted of the following compositions according to mass percent in step (2): rare earth 9-11%,
Mg 4-6%,Si 38-42%,Fe 38-44%,Sr 1.8-2.2%,In 1.5-2.5%；In step (2) silicon barium calcium inovulant according to
Mass percent is made of following chemical component: Si 38-42%, Ba 18-22%, Ca 12-16%, Bi 1.4-1.8%, V 0.4-
0.6%, Mo 0.7-0.9%, Co 0.8-1.0%, W 1.4-1.6%, remaining is Fe；Vermiculizer and inovulant are each in step (2)
Additional amount be respectively molten steel quality 0.4-0.6% and 0.3-0.5%；Ammonia is passed through with the speed of 420-440L/h in step (4)
Kerosene is added dropwise with the speed of 8-10 mL/min in gas.
Embodiment 2:
A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, comprising the following steps:
(1) raw materials such as the Q10 pig iron, spring steel, electrolytic manganese and compacted iron foundry returns are added in smelting furnace, and are warming up to 1540-
1560 DEG C of progress meltings clean after melting 50-60min, and sample and carry out spectrum analysis to the chemical component of its alloy, point
Analysis detects the content of each ingredient, adds manganese iron, tin iron, graphitization carburant and 90 silicon carbide according to testing result, continues melting
It is spare that molten iron is obtained after 10-20min；
(2) one layer of vermiculizer is covered at ladle bottom, and covers one layer of silicon barium calcium inovulant on it, keep the temperature of molten iron to be
1530-1540 DEG C, the molten iron added in above-mentioned steps (1) carries out compactedization inoculation, after molten iron is added completely into, in its liquid
One layer of silicon barium calcium inovulant is covered on face, then covers one layer of vermiculizer on it, carries out secondary compactedization inoculation；
(3) molten iron after molten iron compactedization in above-mentioned steps (2) being bred 30-60s, after being bred by ceramic filter to compactedization
It removes the gred, the molten iron casting after slagging-off is intracavitary to the brake body shell type for being preheated to 1390-1410 DEG C, duration of pouring control
In 4-6min, it is spare that ironcasting first product is obtained after being cooled to room temperature；
(4) the ironcasting first product in above-mentioned steps (3) is placed in tempering furnace, and keeps the temperature 2-2.5h after being warming up to 540-560 DEG C,
Knockout processing is carried out after being cooled to room temperature, and it is spare to obtain ironcasting finished product；
(5) the ironcasting finished product in above-mentioned steps (4) is put into drop control shaft furnace and carries out carbo-nitriding, be warming up to 860-880
DEG C, and it is passed through ammonia into drop control shaft furnace, so that the air in furnace is all discharged, keeping the air pressure in furnace is 0.3-
0.4MPa, then kerosene is slowly added dropwise stops being added dropwise after pressure maintaining permeation 3.5-4h, slow cooling and decompression obtains product.
Wherein, in step (1) each material composition mass percent are as follows: the Q10 pig iron 39%, spring steel 27%, electrolytic manganese
1.0%, compacted iron foundry returns 25%, manganese iron 4.5%, tin iron 0.5%, graphitization carburant 1.5%, 90 silicon carbide 1.5%；In step (1)
Molten iron is made of according to mass percent following chemical component: C 3.5%, Mn 3.5%, Si 1.2%, Sn 0.2%, S 0.025%,
P 0.15%, surplus Fe；Graphitization carburant is made of according to mass percent following chemical component in step (1): C 98-
99%,S 0.05-0.1%,P 0.8-1.2%；Vermiculizer is consisted of the following compositions according to mass percent in step (2): rare earth 9-
11%,Mg 4-6%,Si 38-42%,Fe 38-44%,Sr 1.8-2.2%,In 1.5-2.5%；Silicon barium calcium inovulant in step (2)
It is made of according to mass percent following chemical component: Si 38-42%, Ba 18-22%, Ca 12-16%, Bi 1.4-1.8%, V
0.4-0.6%, Mo 0.7-0.9%, Co 0.8-1.0%, W 1.4-1.6%, remaining is Fe；Vermiculizer and inovulant in step (2)
Each additional amount is respectively the 0.4-0.6% and 0.3-0.5% of molten steel quality；It is logical with the speed of 420-440L/h in step (4)
Enter ammonia, kerosene is added dropwise with the speed of 8-10 mL/min.
Embodiment 3:
A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, comprising the following steps:
(1) raw materials such as the Q10 pig iron, spring steel, electrolytic manganese and compacted iron foundry returns are added in smelting furnace, and are warming up to 1540-
1560 DEG C of progress meltings clean after melting 50-60min, and sample and carry out spectrum analysis to the chemical component of its alloy, point
Analysis detects the content of each ingredient, adds manganese iron, tin iron, graphitization carburant and 90 silicon carbide according to testing result, continues melting
It is spare that molten iron is obtained after 10-20min；
(2) one layer of vermiculizer is covered at ladle bottom, and covers one layer of silicon barium calcium inovulant on it, keep the temperature of molten iron to be
1530-1540 DEG C, the molten iron added in above-mentioned steps (1) carries out compactedization inoculation, after molten iron is added completely into, in its liquid
One layer of silicon barium calcium inovulant is covered on face, then covers one layer of vermiculizer on it, carries out secondary compactedization inoculation；
(3) molten iron after molten iron compactedization in above-mentioned steps (2) being bred 30-60s, after being bred by ceramic filter to compactedization
It removes the gred, the molten iron casting after slagging-off is intracavitary to the brake body shell type for being preheated to 1390-1410 DEG C, duration of pouring control
In 4-6min, it is spare that ironcasting first product is obtained after being cooled to room temperature；
(4) the ironcasting first product in above-mentioned steps (3) is placed in tempering furnace, and keeps the temperature 2-2.5h after being warming up to 540-560 DEG C,
Knockout processing is carried out after being cooled to room temperature, and it is spare to obtain ironcasting finished product；
(5) the ironcasting finished product in above-mentioned steps (4) is put into drop control shaft furnace and carries out carbo-nitriding, be warming up to 860-880
DEG C, and it is passed through ammonia into drop control shaft furnace, so that the air in furnace is all discharged, keeping the air pressure in furnace is 0.3-
0.4MPa, then kerosene is slowly added dropwise stops being added dropwise after pressure maintaining permeation 3.5-4h, slow cooling and decompression obtains product.
Wherein, in step (1) each material composition mass percent are as follows: the Q10 pig iron 41%, spring steel 25%, electrolytic manganese
1.2%, compacted iron foundry returns 25%, manganese iron 4.3%, tin iron 0.5%, graphitization carburant 1.8%, 90 silicon carbide 1.2%；In step (1)
Molten iron is made of according to mass percent following chemical component: C 3.3%, Mn 3.7%, Si 1.0%, Sn 0.05%, S 0.03%,
0.2%, surplus Fe；Graphitization carburant is made of according to mass percent following chemical component in step (1): C 98-99%,
S 0.05-0.1%,P 0.8-1.2%；Vermiculizer is consisted of the following compositions according to mass percent in step (2): rare earth 9-11%,
Mg 4-6%,Si 38-42%,Fe 38-44%,Sr 1.8-2.2%,In 1.5-2.5%；In step (2) silicon barium calcium inovulant according to
Mass percent is made of following chemical component: Si 38-42%, Ba 18-22%, Ca 12-16%, Bi 1.4-1.8%, V 0.4-
0.6%, Mo 0.7-0.9%, Co 0.8-1.0%, W 1.4-1.6%, remaining is Fe；Vermiculizer and inovulant are each in step (2)
Additional amount be respectively molten steel quality 0.4-0.6% and 0.3-0.5%；Ammonia is passed through with the speed of 420-440L/h in step (4)
Kerosene is added dropwise with the speed of 8-10 mL/min in gas.
Embodiment 4:
Detect intensity, wearability and the fatigue resistance of ironcasting of the present invention, choose ironcasting obtained by above-described embodiment 1-3 with
Common ironcasting on the market is rubbed using the bending strength (bending strength: MPa) of three-point bending resistance test ironcasting using grinding wheel
Embrocation detects the wearability (i.e. abrasion loss: mg) of ironcasting, using the fatigue resistance of air bomb test machine testing ironcasting
Can (i.e. ageing time: h), using ironcasting obtained by embodiment 1-3 as experimental group 1-3, plain cast iron part is control group, as a result as follows
Shown in table:
| Group | Experimental group 1 | Experimental group 2 | Experimental group 3 | Control group |
| Bending strength | 450 | 420 | 390 | 270 |
| Abrasion loss | 7 | 9 | 11 | 18 |
| Ageing time | 2240 | 2080 | 1890 | 1360 |
As seen from the above table, since bending strength and its higher performance of ageing time are stronger, the fewer wearability of abrasion loss is better, therefore
The performance of ironcasting obtained by the present invention is far superior to plain cast iron part, and the performance of ironcasting obtained by embodiment 1 is best.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell, which comprises the following steps:
(1) raw materials such as the Q10 pig iron, spring steel, electrolytic manganese and compacted iron foundry returns are added in smelting furnace, and are warming up to 1540-
1560 DEG C of progress meltings clean after melting 50-60min, and sample and carry out spectrum analysis to the chemical component of its alloy, point
Analysis detects the content of each ingredient, adds manganese iron, tin iron, graphitization carburant and 90 silicon carbide according to testing result, continues melting
It is spare that molten iron is obtained after 10-20min；
(2) one layer of vermiculizer is covered at ladle bottom, and covers one layer of silicon barium calcium inovulant on it, keep the temperature of molten iron to be
1530-1540 DEG C, the molten iron added in above-mentioned steps (1) carries out compactedization inoculation, after molten iron is added completely into, in its liquid
One layer of silicon barium calcium inovulant is covered on face, then covers one layer of vermiculizer on it, carries out secondary compactedization inoculation；
(3) molten iron after molten iron compactedization in above-mentioned steps (2) being bred 30-60s, after being bred by ceramic filter to compactedization
It removes the gred, the molten iron casting after slagging-off is intracavitary to the brake body shell type for being preheated to 1390-1410 DEG C, duration of pouring control
In 4-6min, it is spare that ironcasting first product is obtained after being cooled to room temperature；
(4) the ironcasting first product in above-mentioned steps (3) is placed in tempering furnace, and keeps the temperature 2-2.5h after being warming up to 540-560 DEG C,
Knockout processing is carried out after being cooled to room temperature, and it is spare to obtain ironcasting finished product；
(5) the ironcasting finished product in above-mentioned steps (4) is put into drop control shaft furnace and carries out carbo-nitriding, be warming up to 860-880
DEG C, and it is passed through ammonia into drop control shaft furnace, so that the air in furnace is all discharged, keeping the air pressure in furnace is 0.3-
0.4MPa, then kerosene is slowly added dropwise stops being added dropwise after pressure maintaining permeation 3.5-4h, slow cooling and decompression obtains product.
2. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: the mass percent of each material composition in step (1) are as follows: Q10 pig iron 37-41%, spring steel 25-29%, electrolytic manganese 0.8-
1.2%, compacted iron foundry returns 23-27%, manganese iron 4.3-4.7%, tin iron 0.3-0.7%, graphitization carburant 1.2-1.8%, 90 silicon carbide
1.2-1.8%。
3. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: molten iron is made of according to mass percent following chemical component in step (1): C 3.3-3.7%, Mn 3.3-3.7%, Si
1.0-1.4%, Sn 0.05-0.3%, S 0.02-0.03%, P 0.1-0.2%, surplus Fe.
4. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: graphitization carburant is made of according to mass percent following chemical component in step (1): C 98-99%, S 0.05-
0.1%、P 0.8-1.2%。
5. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: vermiculizer is consisted of the following compositions according to mass percent in step (2): rare earth 9-11%, Mg 4-6%, Si 38-42%, Fe
38-44%、Sr 1.8-2.2%、In 1.5-2.5%。
6. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: silicon barium calcium inovulant is made of according to mass percent following chemical component in step (2): Si 38-42%, Ba 18-22%,
Ca 12-16%, Bi 1.4-1.8%, V 0.4-0.6%, Mo 0.7-0.9%, Co 0.8-1.0%, W 1.4-1.6%, remaining is Fe.
7. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: vermiculizer and each additional amount of inovulant are respectively the 0.4-0.6% and 0.3-0.5% of molten steel quality in step (2).
8. a kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell according to claim 1, feature exist
In: ammonia is passed through with the speed of 420-440L/h in step (4), kerosene is added dropwise with the speed of 8-10 mL/min.
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