EP1448339A2 - Vermicular cast iron of high machinability and free from microporosities - Google Patents
Vermicular cast iron of high machinability and free from microporositiesInfo
- Publication number
- EP1448339A2 EP1448339A2 EP02782548A EP02782548A EP1448339A2 EP 1448339 A2 EP1448339 A2 EP 1448339A2 EP 02782548 A EP02782548 A EP 02782548A EP 02782548 A EP02782548 A EP 02782548A EP 1448339 A2 EP1448339 A2 EP 1448339A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cast iron
- vermicular cast
- free
- microporosities
- presenting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
Definitions
- the present report is about a vermicular cast iron, of high machinability and free from microporosity. More specifically, a vermicular cast iron of high machinability and free from microporosities that comprises classes between 350 and 500 MEGA PASCAL of ultimate tensile strength.
- the vermicular cast iron represents a group of Fe-C-Si alloys, with Mn, P, S, and controlled additions of Mg, presenting graphite predominately in vermicular form (form IV according to Standard ASTM A247), with up to 20% of nodules (forms I and II as per Standard ASTM A247) in its microstructure.
- the addition of complementary pearlitic elements, such as Mn, Cr, Cu and Sn allow one to obtain the desired class, which can vary between 350 and 500 Mega Pascal of ultimate tensile strength.
- additions of Ti are also carried out to increase the resistance to wear out and to improve the lubrication of the cylinder in engine blocks.
- Vermicular cast iron has been increasingly applied in automotive components such as internal combustion engine blocks, internal combustion engine heads, disks and brake drums. In general, its application involves the substitution of gray cast iron to increase tensile strength.
- One of the goals of the present invention is to provide vermicular cast iron of high machinability, free from microporosities that allows the increase in the life of tools to be used with the cast part together with the innovated characteristics.
- vermicular cast iron of high machinability, free form microporosities that presents a bigger amount of graphite per volume of vermicular cast iron; this increase being the amount of graphite obtained by the addition of nodules in the microstructure so that the percentage of those nodules be also increased in relation to the volume in the conventional vermicular cast iron.
- the present invention proposes a vermicular cast iron of high machinability and free from microporosities that presents an amount of graphite between 12-15% in volume of vermicular cast iron; the increase in the amount of graphite is obtained with the addition of nodules to the microstructure, resulting in an amount between 20-40% in the volume of vermicular cast iron.
- the machinability is improved, if compared to the conventional vermicular iron, with the limitation of elements that form carbide or carbonitrides
- vermicular cast iron of high machinability and free from microporosities has a content of carbon between 3,6 and 3,9%, a content of Si between 2,0 and
Abstract
Vermicular cast iron of high machinability and free from microporosities, comprising classes between 350 and 500 MEGA PASCAL of ultimate tensile strength, presenting a bigger amount of graphite by volume of vermicular cast iron, this increase in the amount of graphite obtained with additional nodules in the microstructure so that the percentage of those nodules is also increased in relation to the volume of vermicular cast iron.
Description
"VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES" .
The present report is about a vermicular cast iron, of high machinability and free from microporosity. More specifically, a vermicular cast iron of high machinability and free from microporosities that comprises classes between 350 and 500 MEGA PASCAL of ultimate tensile strength.
As known to experts in the area, the vermicular cast iron represents a group of Fe-C-Si alloys, with Mn, P, S, and controlled additions of Mg, presenting graphite predominately in vermicular form (form IV according to Standard ASTM A247), with up to 20% of nodules (forms I and II as per Standard ASTM A247) in its microstructure. The addition of complementary pearlitic elements, such as Mn, Cr, Cu and Sn allow one to obtain the desired class, which can vary between 350 and 500 Mega Pascal of ultimate tensile strength.
In some cases, additions of Ti are also carried out to increase the resistance to wear out and to improve the lubrication of the cylinder in engine blocks.
Vermicular cast iron has been increasingly applied in automotive components such as internal combustion engine blocks, internal combustion engine heads, disks and brake drums. In general, its application involves the substitution of gray cast iron to increase tensile strength.
This substitution, however, brings some manufacturing problems not yet entirely solved such as the
tendency to form solidification porosities and low machinability of the part.
The said tendency to form solidification porosities results in blanks at places of mass concentration that are usually the last places to solidify. This phenomenon occurs due to the part volumetric shrinkage which takes place when going from a liquid condition to a solid condition.
This problem is partially solved with the use of feeders at places of mass concentration which is not always possible in parts of high geometric complexity such as engine blocks and heads.
The low machinability of conventional vermicular cast iron is already known and reflects in the decrease of a tool life when compared to gray cast iron machining. This decrease depends on the particular machining operation, but in general is not lower than 50%, as in milling and boring operations; it could, though, reach a 95% decrease in the life of the tool in cylinder .hole reaming operations.
One of the goals of the present invention is to provide vermicular cast iron of high machinability, free from microporosities that allows the increase in the life of tools to be used with the cast part together with the innovated characteristics.
This and other goals and advantages of the present invention are achieved with the vermicular cast iron of high machinability, free form microporosities that
presents a bigger amount of graphite per volume of vermicular cast iron; this increase being the amount of graphite obtained by the addition of nodules in the microstructure so that the percentage of those nodules be also increased in relation to the volume in the conventional vermicular cast iron.
Particularly, the present invention proposes a vermicular cast iron of high machinability and free from microporosities that presents an amount of graphite between 12-15% in volume of vermicular cast iron; the increase in the amount of graphite is obtained with the addition of nodules to the microstructure, resulting in an amount between 20-40% in the volume of vermicular cast iron.
With this increase in the amount of graphite it is possible to counterbalance the contraction of solidification, producing parts that are free from solidification porosities. At the same time, this increase in the amount of graphite results in the improvement of machinability due to the lubrication effect that the graphite exerts on the cutting tool.
On the other hand, as the increase of the amount of graphite occurs by the addition of a percentage of nodules, the tensile strength properties are not decreased.
In addition, the machinability is improved, if compared to the conventional vermicular iron, with the limitation of elements that form carbide or carbonitrides
(Cr, Mn, Ti) and with the formation of pearlite between 50 and 100% pearlite, according to the class (350 to 500 Mega
Pascal), lamellar spacing bigger than 0,5 microns, which is obtained under adequate part cooling at a temperature ranging between 800° and 650°C.
Therefore the vermicular cast iron of high machinability and free from microporosities has a content of carbon between 3,6 and 3,9%, a content of Si between 2,0 and
2,6%, a content of Cr lower than 0,05%, a content of Mn lower than 0,40% and a content of Ti lower than 0,015 %.
The machinability advantages aforementioned are thus increased.
Despite the fact that a preferred constructive concept has been described and illustrated, it is important to mention that changes are feasible and possible to be carried out without deviating from the scope of the present invention.
Claims
Claims
1- "VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES", comprising classes between 350 and 500 MEGA PASCAL of ultimate tensile strength, characterized by presenting a amount of graphite per volume of vermicular cast iron; this increase in the amount of graphite is obtained by additional nodules in the microstructure so that the percentage of those nodules is also increased in relation to the volume of the vermicular cast iron.
2- "VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES", as per claim 1, characterized by presenting machinability equal or bigger than 40% of conventional vermicular cast iron, machinability evaluated by the life of the cutting tool.
3- "VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES", as per claim 1 or 2, characterized by presenting an amount of graphite between 12-15% in volume of vermicular cast iron; and with the presence of nodules in the microstructure ranging between 20-40% in weight of the vermicular cast iron, without the presence of graphite lamellar.
4- "VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES", as per claim 1 or 2 or 3, characterized by presenting a metallic matrix microstructure comprised of ferrite and pearlite, proportion of 50 to 100% pearlite, according to class (350 to 500 Mega Pascal) , and with the pearlite presenting interlamellar spacing of around
microns in a section thickness of 5mm.
5- "VERMICULAR CAST IRON OF HIGH MACHINABILITY AND FREE FROM MICROPOROSITIES", as per claim 1 or 2 or 3 or 4, characterized by presenting a content of carbon between 3,6 and 3,9%, a content of Si between 2,0 and 2,6%, a content of Cr lower than 0,05%, a content of Mn lower than 0,40% and a content of Ti lower than 0,015 %.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0105988A BR0105988B1 (en) | 2001-11-27 | 2001-11-27 | High machinability and microporosity-free vermicular cast iron. |
BR0105988 | 2001-11-27 | ||
PCT/BR2002/000163 WO2003045624A2 (en) | 2001-11-27 | 2002-11-26 | Vermicular cast iron of high machinability and free from microporosities |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1448339A2 true EP1448339A2 (en) | 2004-08-25 |
EP1448339A4 EP1448339A4 (en) | 2005-02-23 |
Family
ID=3948159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02782548A Withdrawn EP1448339A4 (en) | 2001-11-27 | 2002-11-26 | Vermicular cast iron of high machinability and free from microporosities |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1448339A4 (en) |
BR (1) | BR0105988B1 (en) |
WO (1) | WO2003045624A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104480377B (en) * | 2014-12-15 | 2017-05-17 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron single cylinder diesel engine body with high vermicular graphite rate and preparation method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1069058A (en) * | 1965-05-04 | 1967-05-17 | Int Nickel Ltd | Cast iron |
US4409028A (en) * | 1979-10-24 | 1983-10-11 | Moore William H | Process for producing cast iron |
JPH04128340A (en) * | 1990-09-19 | 1992-04-28 | Hitachi Ltd | Compact vermicular graphite cast iron and sheave for elevator using the same |
EP0769615A1 (en) * | 1995-10-17 | 1997-04-23 | Ford Motor Company Limited | Engine cylinder block |
JPH09202935A (en) * | 1996-11-15 | 1997-08-05 | Hitachi Ltd | Compacted vermicular graphite cast iron and sliding device using the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85107725B (en) * | 1985-10-17 | 1987-12-23 | 陕西机械学院 | Creeping graphite cast iron for manufacturing mould for glass bottle |
US5858127A (en) * | 1996-08-02 | 1999-01-12 | Gunite Corporation | Metal alloys and brake drums made from such alloys |
SE9904257D0 (en) * | 1999-11-23 | 1999-11-23 | Sintercast Ab | New cast iron alloy |
-
2001
- 2001-11-27 BR BR0105988A patent/BR0105988B1/en not_active IP Right Cessation
-
2002
- 2002-11-26 WO PCT/BR2002/000163 patent/WO2003045624A2/en not_active Application Discontinuation
- 2002-11-26 EP EP02782548A patent/EP1448339A4/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1069058A (en) * | 1965-05-04 | 1967-05-17 | Int Nickel Ltd | Cast iron |
US4409028A (en) * | 1979-10-24 | 1983-10-11 | Moore William H | Process for producing cast iron |
JPH04128340A (en) * | 1990-09-19 | 1992-04-28 | Hitachi Ltd | Compact vermicular graphite cast iron and sheave for elevator using the same |
EP0769615A1 (en) * | 1995-10-17 | 1997-04-23 | Ford Motor Company Limited | Engine cylinder block |
JPH09202935A (en) * | 1996-11-15 | 1997-08-05 | Hitachi Ltd | Compacted vermicular graphite cast iron and sliding device using the same |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 0163, no. 94 (C-0976), 21 August 1992 (1992-08-21) & JP 4 128340 A (HITACHI LTD), 28 April 1992 (1992-04-28) * |
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 12, 25 December 1997 (1997-12-25) & JP 9 202935 A (HITACHI LTD), 5 August 1997 (1997-08-05) * |
ROHRIG, K.: "Cast Iron With Vermicular Graphite-Processing, Properties, Applications.ÄGusseisen mit Vermiculargraphit -Herstellung, Eigenschaften , Anwendung .Ü." KONSTRUIEREN & GIESSEN 16, (1), 7-27, PHOTOMICROGRAPHS, GRAPHS, 29 REF. ISSN: 0341-6615, 1991, XP009041753 * |
See also references of WO03045624A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003045624A2 (en) | 2003-06-05 |
WO2003045624A3 (en) | 2004-03-18 |
EP1448339A4 (en) | 2005-02-23 |
BR0105988A (en) | 2002-11-12 |
BR0105988B1 (en) | 2009-08-11 |
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Legal Events
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Effective date: 20040614 |
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A4 | Supplementary search report drawn up and despatched |
Effective date: 20050111 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: 7C 22C 37/00 A |
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17Q | First examination report despatched |
Effective date: 20050317 |
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Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20050728 |