CN101191178A - Formulation and technique for casting high-strength automobile brake wheel hub - Google Patents
Formulation and technique for casting high-strength automobile brake wheel hub Download PDFInfo
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- CN101191178A CN101191178A CNA2006100512931A CN200610051293A CN101191178A CN 101191178 A CN101191178 A CN 101191178A CN A2006100512931 A CNA2006100512931 A CN A2006100512931A CN 200610051293 A CN200610051293 A CN 200610051293A CN 101191178 A CN101191178 A CN 101191178A
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Abstract
The invention is a high strength car brake wheel hub casting formula and the process thereof, adding three elements Chromium, Vanadium and Titanium into the gray cast iron main material in addition to the five mainly contained elements Carbon, Silicon, Phosphorus and Sulfur. The invention can improve rigidity, increase abrasion resistance, without thermal fatigue produced by braking or net cracks, increase tensile and flexural properties, and extend the life span of brake wheel hub more than double.
Description
One, technical field
High-strength automotive brake hub casting prescription of the present invention and technology belong to metal casting, and concrete technical field belongs to the foundry engieering that graphitic cast iron is produced automobile brake wheel hub.
Two, background technology
In the prescription of existing casting of automobile brake hub, major ingredient-trade mark is that (HT250) possessed contained carbon in 250 the graphitic cast iron, silicon, manganese, phosphorus, the main five macrospecies principal elements of sulphur, and the content of these elements is controlled within certain value range, automobile-used wheel hub with HT250 production, substantially can satisfy the requirement of vehicle hub drag, but along with automotive engineering constantly at a high speed, directions such as heavy duty develop, frequently brake with this understanding having higher requirement the work-ing life of automotive brake hub, in the past under low speed underloading condition, the fair braking hub of performance performance also can not satisfy service requirements gradually, mainly show: (1) hardness is on the low side, and is not wear-resisting; (2) wheel hub hardness is too high, and the bright spot of hard appears in the brake hub brake strap, and it is uneven that brake strap is occurred, the braking abnormal sound; (3) braking produces the thermal fatigue map cracking--be full of cracks, easily cause braking the hub fracture, make braking hub braking effect poor, reduce work-ing life greatly, have a strong impact on running safety, after deliberation, analyze, test, adopt the method for adding alloying element, solve this difficult problem, still found no the identical technical recipe and the report of related products by retrieval.
Three, summary of the invention
The objective of the invention is suitably increases hardness at existing automobile brake wheel hub short defective in work-ing life, improves wear resistance, improves fold resistance, and enhance mechanical strength is to prolong the work-ing life of wheel hub.
In order to realize this purpose, analyze the reason that defective appears in existing automobile brake wheel hub, the alloying element of finding various combination can make molten steel solidification carry out towards the direction of expection, the tissue that generation is useful to material property, the while crystal grain thinning, improve Tensile strength and hardness, prolong product work-ing life, from iron-carbon phase diagram as can be known, the chromium element makes the solubleness of carbon in austenite increase in cast iron, thereby hinder ferrite and give birth to the nuclear growth, be that very strong perlite is facilitated element, but in process of setting, chromium facilitates the effect of cementite very strong, and the chilling tendency of cast iron is strengthened, in graphitic cast iron, add a spot of chromium and can make the graphite refinement, reduce ferrite and increase perlite.Vanadium is the element that forms carbide strongly, add in the graphitic cast iron iron vanadium then chilling tendency greatly strengthen, add-on is seldom the time, the effect of vanadium is more easy to control, can make graphite tiny and perlite is increased effectively, thereby improve the intensity of cast iron.The influence of titanium is comparatively complicated, and titanium is very strong carbide forming element in general, but its content seldom the time its miniaturization compound can be used as the core of graphite, the graphited effect of promotion is arranged.
When gray cast iron smelting, except in the raw material material, having contained carbon, silicon, manganese, phosphorus, sulphur (C, Si, Mn, P, S) element, new chromium, vanadium, three kinds of elements of titanium (Cr, V, Ti) of adding, add-on is respectively chromium 0.5-0.8%, titanium 0.05-0.09%, vanadium 0.05-0.09%, the adding mode is that chromium, vanadium (Cr, V) add with furnace charge, titanium (Ti) is added in the forehearth iron notch in advance before going out molten iron, and concrete melting technology is as follows:
1, furnace charge is prepared: the pig iron, foundry return, steel scrap, iron alloy, Wingdale, coke; The lumpiness size to fit of furnace charge is removed the sand and the foreign material of its surface attachment, and metal charge and coke should keep dry;
2, repair stove: repair burner hearth, air port eye, furnace bottom, gap bridge etc.;
3, repair apparatus: guarantee that instruments such as blowing device, feeding equipment, forehearth, cupola furnace, big casting ladle are intact, each moving parts is lubricated good;
4, baker and igniting: oven dry, preheating forehearth and casting ladle; Treat that cupola furnace dries by the fire certain the time, adds the thick bed coke of 60-65cm at twice;
5, reinforced:
(1) bed coke height is suitably also closed upper wind door after the burning, and is air blast 2-3 minute, out-of-blast after the ash disposal;
(2) add Wingdale when coke is burned to second exhaust outlet, its add-on is 2 times of lime in the batch of material, adds metal charge big or small about 200 kilograms according to cupola furnace;
(3) order of addition(of ingredients): coke, Wingdale, steel scrap, the new pig iron, chrome alum, iron alloy, foundry return, multilayer successively circulates, be added to till the lower edge of material mouth always, each metal level gross weight is about 200 kilograms, every coke charge charcoal thickness is 12-16, the height that the add-on of coke is kept bed coke with the burning that can supply bed coke is as the criterion, and it is about 30% of weight of coke that Wingdale is added in its weight of burner hearth center as far as possible;
6, air-supply is observed and control stove internal combustion situation;
7, in suitable, slag tap, before the water outlet titanium (Ti) is preset in the iron notch, borrow the molten iron impulse force to pour in the casting ladle;
8, the stokehold is checked: through wedge test piece section gray and organize finer and closely wovenly, prove that molten steel quality is qualified, can pour into a mould.
Automobile brake wheel hub through the graphitic cast iron production of above-mentioned prescription improvement all is greatly improved on intensity and hardness, and its tensile strength reaches 300Mpa, and Brinell hardness reaches 210HB.
Adopting the beneficial effect of the technical program is the work-ing life of improving automobile brake wheel hub greatly, the automobile brake wheel hub of produced in conventional processes can only use 3-6 month, and the brake hub that present method is produced can use 10 months to 12 months, than having increased more than 1 times original work-ing life.
Four, description of drawings
(nothing)
Five, embodiment
Casting high-strength automobile brake wheel hub prescription of the present invention and technology, concrete embodiment is as follows:
Order by the melting material adds coke, Wingdale, steel scrap, the new pig iron, adding chromium is 0.8% of total weight metal, vanadium is total weight metal 0.09%, iron alloy, foundry return, circulation successively are added to till the lower edge of charging opening always, and various metal layered material gross weights are 200 kilograms, every coke charge charcoal thickness is 14cm, the add-on of coke charge is as the criterion with the burning that can supply bed coke, the height of keeping bed coke, and Wingdale is added in the burner hearth center, and adding weight is 30% of weight of coke.Furnace charge installs back preheating beginning in 20 minutes air blast, observe and control stove internal combustion situation by the air port peep hole in the air blast process, air blast prepares about 30 minutes to tap a blast furnace, and can be preset at titanium (Ti) in the iron notch this moment, borrows the molten iron impulse force that it is poured in the casting ladle and (need not stir).Just begin cast after stokehold check molten iron temperature, composition are qualified, take out foundry goods after 10 minutes, the annealing destressing treats that it is cooled to room temperature and carries out shot blasting, mechanical workout, check back warehouse-in.
Claims (3)
1. casting high-strength automobile brake wheel hub prescription and technology, it is characterized in that: when gray cast iron smelting, contained carbon, silicon, manganese, phosphorus, sulphur (C, Si, Mn, P, S) element in except original material, new chromium, vanadium, three kinds of elements of titanium (Cr, V, Ti) of adding, add-on is respectively chromium (Cr) 0.5-0.8%, vanadium (V) 0.05-0.09%, titanium (Ti) 0.05-0.09%, obtains product through melting, cast, moulding, annealing, sand removal, mechanical workout.
2. by described casting high-strength automobile brake wheel hub prescription of claim 1 and technology, it is characterized in that: add with furnace charge when the adding mode of chromium, vanadium is melting, the adding mode of titanium is preset in the iron notch before going out molten iron.
3. by described casting high-strength automobile brake wheel hub prescription of claim 1 and technology, it is characterized in that: feed in raw material and press coke, Wingdale, steel scrap, the new pig iron, chromium, vanadium, iron alloy, the circulated layered successively adding of foundry return, the metal level gross weight is 200 kilograms, every coke charge charcoal thickness is 12-16cm, and the add-on of Wingdale is 30% of a weight of coke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100512931A CN100532616C (en) | 2006-11-25 | 2006-11-25 | Formula and technique for casting high-strength automobile brake wheel hub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100512931A CN100532616C (en) | 2006-11-25 | 2006-11-25 | Formula and technique for casting high-strength automobile brake wheel hub |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101191178A true CN101191178A (en) | 2008-06-04 |
| CN100532616C CN100532616C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100512931A Expired - Fee Related CN100532616C (en) | 2006-11-25 | 2006-11-25 | Formula and technique for casting high-strength automobile brake wheel hub |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818296A (en) * | 2010-04-20 | 2010-09-01 | 福建畅丰车桥制造有限公司 | Process for casting brake drum |
| CN101942599A (en) * | 2010-09-09 | 2011-01-12 | 周道虎 | Formula of automobile brake hub and manufacturing process thereof |
| CN101643813B (en) * | 2008-08-07 | 2011-04-13 | 遵义金业机械铸造有限公司 | Method for producing high-strength automotive brake hub and casting thereof |
| CN102562878A (en) * | 2011-12-12 | 2012-07-11 | 袁墩举 | Manufacturing method for automobile brake disc or brake hub |
| CN102816969A (en) * | 2012-08-20 | 2012-12-12 | 合肥江淮铸造有限责任公司 | Casting method of hub |
| CN104178687A (en) * | 2014-08-29 | 2014-12-03 | 无锡柯马机械有限公司 | Casting process of automobile brake part |
| CN105755358A (en) * | 2016-04-12 | 2016-07-13 | 宁波吉威熔模铸造有限公司 | Casting process of high-strength train coupling |
| CN106734897A (en) * | 2016-12-26 | 2017-05-31 | 安庆迪力机械铸造有限公司 | A kind of high intensity fork truck brake hub casting |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2142805Y (en) * | 1992-12-21 | 1993-09-29 | 成都市新都龙桥机械厂 | Back-braking drum |
| CN1145415A (en) * | 1996-03-12 | 1997-03-19 | 樊显理 | Low Ni alum Ti alloyed wearproof cast iron |
| GB9718982D0 (en) * | 1997-09-09 | 1997-11-12 | T & N Technology Ltd | Disc brake rotor |
-
2006
- 2006-11-25 CN CNB2006100512931A patent/CN100532616C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643813B (en) * | 2008-08-07 | 2011-04-13 | 遵义金业机械铸造有限公司 | Method for producing high-strength automotive brake hub and casting thereof |
| CN101818296A (en) * | 2010-04-20 | 2010-09-01 | 福建畅丰车桥制造有限公司 | Process for casting brake drum |
| CN101942599A (en) * | 2010-09-09 | 2011-01-12 | 周道虎 | Formula of automobile brake hub and manufacturing process thereof |
| CN102562878A (en) * | 2011-12-12 | 2012-07-11 | 袁墩举 | Manufacturing method for automobile brake disc or brake hub |
| CN102816969A (en) * | 2012-08-20 | 2012-12-12 | 合肥江淮铸造有限责任公司 | Casting method of hub |
| CN104178687A (en) * | 2014-08-29 | 2014-12-03 | 无锡柯马机械有限公司 | Casting process of automobile brake part |
| CN105755358A (en) * | 2016-04-12 | 2016-07-13 | 宁波吉威熔模铸造有限公司 | Casting process of high-strength train coupling |
| CN106734897A (en) * | 2016-12-26 | 2017-05-31 | 安庆迪力机械铸造有限公司 | A kind of high intensity fork truck brake hub casting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100532616C (en) | 2009-08-26 |
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