CN105861918A - Easy-to-machine vermicular graphite cast iron - Google Patents
Easy-to-machine vermicular graphite cast iron Download PDFInfo
- Publication number
- CN105861918A CN105861918A CN201610339610.3A CN201610339610A CN105861918A CN 105861918 A CN105861918 A CN 105861918A CN 201610339610 A CN201610339610 A CN 201610339610A CN 105861918 A CN105861918 A CN 105861918A
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- cast iron
- vermicular cast
- vermicular
- easy
- machine
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides easy-to-machine vermicular graphite cast iron and belongs to the technical field of cast iron materials. The easy-to-machine vermicular graphite cast iron is mainly prepared by adding cubic boron nitride (BN) powder into molten iron of conventional vermicular graphite cast iron, so that BN can be uniformly distributed in the easy-to-machine vermicular graphite, the easy-to-machine vermicular graphite can possess the self-lubricating property, and the mechanical property of the easy-to-machine vermicular graphite can remain unchanged when the cutting machinability is improved on the basis that the natural hardness and tensile strength properties of the easy-to-machine vermicular graphite are kept. Accordingly, the easy-to-machine vermicular graphite cast iron can be economically and efficiently machined by cutting.
Description
[technical field]
The present invention relates to cast iron materials technical field, be specifically related to the vermicular cast iron of a kind of easy processing.
[background technology]
Vermicular cast iron has mechanical property excellent between grey cast-iron and spheroidal graphite cast-iron, at internal combustion engine cylinders and cylinder cap, mould
The aspect such as industry and brake parts all has important ample scope for abilities.But, vermicular cast iron belongs to difficult-to-machine material, to compacted ink
During cast iron carries out machining, generally there is inefficiency and the high phenomenon of processing charges, this seriously inhibits compacted ink casting
The popularization and application of ferrum.
At present, the method solving vermicular cast iron difficulty machining mainly has: develops more preferable cutting tool and uses more advanced adding
Work lathe.Although, these methods achieve the biggest breakthrough, but this needs by expensive process equipment.A lot of processing enterprises
The most do not possess the economic strength using these sophisticated equipments so that this ameliorative way can not be widely used, and compacted from improving
The processing characteristics angle of ink cast iron itself.
[summary of the invention]
The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that the vermicular cast iron of a kind of easy processing, and proposes past
Vermicular cast iron adds appropriate boron nitride (BN), the while of making the machinability of vermicular cast iron improved, does not change its power
Learn performance, therefore can not only economy but also efficiently vermicular cast iron is carried out machining.
To achieve these goals, the technical solution used in the present invention is as follows:
The vermicular cast iron of a kind of easy processing, the constituent of described vermicular cast iron and percentage by weight be C be 3.4%～3.6%, Si
Being 2.4%～3.0%, Mn is 0.4%～0.6%, S% < 0.06%, P% < 0.07%, and remaining is Fe, in described vermicular cast iron also
Including and account for the BN compound that vermicular cast iron total weight percent is 0.005%～0.0233%, BN compound is that particle mean size is
Cube BN monocrystalline of 0.5～20 μm, and described vermicular cast iron is under the temperature molten condition of 1300～1500 DEG C, is directly added into vertical
The monocrystalline mix homogeneously of side BN follow-up continuous be kept molten by 0.5～1h after moulding by casting, produce according still further to conventional method；Because of vertical
The monocrystalline of side BN has self lubricity, mixes the frictional force that can reduce Cast Iron Surface with vermicular cast iron, makes the work of vermicular cast iron
Part can obtain more preferable suface processing quality and Chip Morphology；The nodulizing rate of vermicular cast iron can not be changed simultaneously, keep material
Other correlated performances are constant.
More preferably, the vermicular cast iron of described a kind of easy processing, through dispensing, melted, compactedization, pour into a mould, the air cooling and bury sand of unpacking
Cooling technique prepares；BN is as vermiculizer and at a temperature of 1300～1500 DEG C, presented in monocrystalline powder body, and Ke Yiyou
Effect as nucleus, promote that when compactedization graphite compactedization crystallizes, and at high temperature BN stable performance do not decompose, and is effectively ensured
The stability of graphite crystallization during compactedization.
More preferably, the vermicular cast iron of described a kind of easy processing, it is not required to can directly process through stress relief annealing heat treatment under as cast condition
Using, the self lubricity of BN can reduce or avoid the bad phenomenon that described vermicular cast iron is deformed in the course of processing or ftractures,
Add BN vermicular cast iron surface lubrication simultaneously and also effectively reduce the friction in working angles, extend cutting-tool's used life.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
(1) vermicular cast iron of the present invention adds BN and can improve the self lubricity during cast iron process as vermiculizer, reduces
What vermicular cast iron workpiece stress in the course of processing caused deforms or the phenomenon of cracking.
(2) the vermiculizer at high temperature stable performance of the added BN of vermicular cast iron of the present invention, and do not decompose, can be effective
Promote the graphite crystallization during compactedization, improve compactedization efficiency.
(3) present invention does not change its mechanical property while of making the machinability of vermicular cast iron improved, therefore can both warps
Ji carries out machining to vermicular cast iron again efficiently.
(4) present invention adds the vermicular cast iron surface lubrication of BN, effectively reduces the friction in working angles, extends cutter
Service life, reduce processing cost.
[detailed description of the invention]
The following is illustrating of the embodiment of the present invention 1～3.
Embodiment 1～3 is respectively according to vermicular cast iron and cubic boron nitride (BN) 100:0.0089,100:0.0144,100:0.0233
Proportioning has weighed vermicular cast iron powder, cubic boron nitride (BN) powder, vermicular cast iron powder is added heat fusing, and maintains the temperature at 1400
DEG C, boron nitride powder is added in the vermicular cast iron in smelting furnace, utilize the vermicular cast iron after fusing by boron nitride under thermal convection current
Powder is evenly distributed in molten iron, then keeps happy and harmonious state 1h of vermicular cast iron, then vermicular cast iron compactedization again, pour into a mould, unpack
Air cooling is cooled to room temperature with burying sand, then measures the material property of the vermicular cast iron of moulding by casting, and wherein comparative example does not puts into nitridation
Boron powder, embodiment 1～3 and the component of comparative example and performance and as shown in table 1 below:
In above-described embodiment, the constituent of vermicular cast iron and percentage by weight be C be 3.5%, Si is 2.6%, and Mn is 0.5%,
S% < 0.06%, P% < 0.07%, remaining is Fe.When the constituent of certain vermicular cast iron and percentage by weight are following scope,
Can realize the technique effect of the present invention, wherein, C is 3.4%～3.6%, and Si is 2.4%～3.0%, and Mn is 0.4%～0.6%,
S% < 0.06%, P% < 0.07%, remaining is Fe.
Table 1 embodiment of the present invention 1～3 and the vermicular graphite iron material component of comparative example and performance data
Data from table 1, it can be seen that be added without the vermicular cast iron of boron nitride (BN) powder during machining, are rubbed
Wiping coefficient is big, and wear of work amount is many, is easily caused workpiece surface quality poor, and the boron nitride of the present invention (BN) additional proportion is
When 0.0144%, the workpiece of vermicular cast iron coefficient of friction in mechanical processing process is minimum, and percentage elongation is maximum, illustrates that wear extent is minimum,
Processing characteristics is the best, and the hardness of the vermicular graphite iron material of the present invention, and tensile strength all can keep performance not add the compacted ink of boron nitride
The performance of cast iron.
Claims (6)
1. a vermicular cast iron for easy processing, the constituent of described vermicular cast iron and percentage by weight be C be 3.4%～3.6%；
Si is 2.4%～3.0%, and Mn is 0.4%～0.6%, S% < 0.06%, P% < 0.07%, and remaining is Fe, it is characterised in that: institute
State vermicular cast iron also includes and account for the BN compound that vermicular cast iron total weight percent is 0.0089%～0.0233%.
A kind of vermicular cast iron of easy processing, it is characterised in that: described BN compound is described compacted
The vermiculizer of ink cast iron, and be cube BN monocrystalline of 0.5～20 μm for particle diameter.
The vermicular cast iron of a kind of easy processing the most according to claim 1 or claim 2, it is characterised in that: described vermicular cast iron is 1300
Temperature more than DEG C, under molten condition, is directly added into casting after the monocrystalline mix homogeneously of cube BN, and makes compactedization efficiency
Control more than 92%.
A kind of vermicular cast iron of easy processing, it is characterised in that: vermicular cast iron through dispensing, melted,
Compactedization, pour into a mould, unpack air cooling with bury sand cooling but technique prepare.
A kind of vermicular cast iron of easy processing, it is characterised in that: described vermicular cast iron under as cast condition not
Use can need to be directly processed through stress relief annealing heat treatment.
6. the method improving vermicular cast iron processing characteristics, it is characterised in that: described method is by the raw materials melt of vermicular cast iron
After, add and account for the BN compound that vermicular cast iron total weight percent is 0.0089%～0.0233%, then keep vermicular cast iron to melt
After state 0.5～1h, produce the most according to a conventional method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610339610.3A CN105861918A (en) | 2016-05-23 | 2016-05-23 | Easy-to-machine vermicular graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610339610.3A CN105861918A (en) | 2016-05-23 | 2016-05-23 | Easy-to-machine vermicular graphite cast iron |
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| Publication Number | Publication Date |
|---|---|
| CN105861918A true CN105861918A (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610339610.3A Pending CN105861918A (en) | 2016-05-23 | 2016-05-23 | Easy-to-machine vermicular graphite cast iron |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023025A (en) * | 2018-08-20 | 2018-12-18 | 江苏力源金河铸造有限公司 | A kind of preparation method with high-elongation vermicular cast iron |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5014967B1 (en) * | 1971-12-08 | 1975-05-31 | ||
| SU1216240A1 (en) * | 1984-09-26 | 1986-03-07 | Proizv Ob Gomselmash | High-duty cast iron |
| SU1742348A1 (en) * | 1990-07-20 | 1992-06-23 | Всесоюзный Заочный Политехнический Институт | High-duty cast iron |
| WO2001055458A1 (en) * | 2000-01-28 | 2001-08-02 | Subramanian Sundaresa V | Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced |
| CN101093003A (en) * | 2006-06-19 | 2007-12-26 | 张跃成 | Brake drum made from vermicular cast iron, and manufacturing technique |
-
2016
- 2016-05-23 CN CN201610339610.3A patent/CN105861918A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5014967B1 (en) * | 1971-12-08 | 1975-05-31 | ||
| SU1216240A1 (en) * | 1984-09-26 | 1986-03-07 | Proizv Ob Gomselmash | High-duty cast iron |
| SU1742348A1 (en) * | 1990-07-20 | 1992-06-23 | Всесоюзный Заочный Политехнический Институт | High-duty cast iron |
| WO2001055458A1 (en) * | 2000-01-28 | 2001-08-02 | Subramanian Sundaresa V | Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced |
| CN101093003A (en) * | 2006-06-19 | 2007-12-26 | 张跃成 | Brake drum made from vermicular cast iron, and manufacturing technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023025A (en) * | 2018-08-20 | 2018-12-18 | 江苏力源金河铸造有限公司 | A kind of preparation method with high-elongation vermicular cast iron |
| CN109023025B (en) * | 2018-08-20 | 2019-11-29 | 江苏力源金河铸造有限公司 | A kind of preparation method with high-elongation vermicular cast iron |
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Application publication date: 20160817 |
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