CN108994262A - Cooling oil duct salt core sintering method in a kind of aluminum piston - Google Patents
Cooling oil duct salt core sintering method in a kind of aluminum piston Download PDFInfo
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- CN108994262A CN108994262A CN201811002496.0A CN201811002496A CN108994262A CN 108994262 A CN108994262 A CN 108994262A CN 201811002496 A CN201811002496 A CN 201811002496A CN 108994262 A CN108994262 A CN 108994262A
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- salt core
- stage
- oil duct
- cooling oil
- temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses cooling oil duct salt core sintering methods in a kind of aluminium aluminum piston, including: is to keep the temperature -3 hours 1 hour after the salt core sintering temperature after turning is warming up to 80 DEG C -200 DEG C by 20 DEG C -30 DEG C the first stage, second stage is to keep the temperature -3 hours 1 hour after sintering temperature is warming up to 600 DEG C -700 DEG C, then naturally cools to 20 DEG C -30 DEG C.It using the salt core sintering method of cooling oil duct in aluminum piston provided by the invention, can be realized: 1. compared with existing salt core is fired, burning out salt core expansion rate 8 ‰ -12 ‰ by new burning process, and the intensity difference between same furnace salt core is not more than 15%；2. the salt core strength enhancing 10%-15% burnt out by new process, geomery variable quantity is small, and the overall acceptability rate of salt core promotes 10% or more；3. the comprehensive qualified rate of salt core is promoted, working time is saved, it is opposite to improve the qualification rate of aluminum piston blank, reduce piston manufacturing cost.
Description
Technical field
The present invention relates to cooling in the salt core manufacture technology field of cooling oil duct in aluminum piston more particularly to a kind of aluminum piston
Oil duct salt core sintering method.
Background technique
The appearance of cooling oil duct piston significantly enhances piston crown rate of heat dispation in annular, reduces head thermic load,
So that diesel engine strengthening becomes possibility.But interior oil cooling passage is present in internal piston, is difficult with the mode that standard machinery is processed
It is formed, therefore the interior cooling oil duct on its head can only be formed in the process of piston blank casting, and can only one-pass molding.Band annular
When interior oil cooling passage all-aluminium piston is cast, need to be formed the interior cooling oil duct on its head using salt core.
At present the method for comparative maturity be fabricate out the identical salt core of shape in advance according to the size of interior oil cooling passage, then
Salt core is fixed on to pour in the salt core support of piston casting internal model and casts out piston blank, finally passes through piston with high pressure water again
Disengaging oilhole in inner cavity develops salt core, and the cavity left after flushing is oil duct in piston.By above-mentioned it is found that
Piston blank of casting just needs one salt core of consumption；In addition, the whether qualified direct relation of the quality and size of salt core quality
To the reliability of interior oil cooling passage；So the reliability of salt core is most important during band internally-cooled oil channel piston is manufactured.
The main component of salt core is Nacl (NaCl), will be by compacting, turning, high temperature firing, drilling etc. one in production
Serial process can just produce qualified salt core finished product.
The shortcomings that existing burning process, mainly has:
1. industry is fired, furnace volume is larger, and there are the non-uniform situation of furnace temperature (i.e. different positions in prior art sintering procedure
There are the temperature difference for the furnace temperature set), this phenomenon will lead to that same furnace salt core intensity is inconsistent and difference is very big, drills and pours to the later period
Casting process makes troubles；
2. there are larger differences for the salt core swell increment after same furnace salt core firing, oil duct in piston geomery will cause
There are deviations, and piston can be directly resulted in when serious and is scrapped because of oil duct dimension overproof；
3. salt core qualification rate is lower, manufacturing cost is high.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of salt core sintering methods of cooling oil duct in aluminum piston, to mention
High same furnace salt core intensity and expansion rate consistency promote salt core integral strength, reduce the fracture of salt core, promote qualification rate.
In order to achieve the above object, the invention provides the following technical scheme:
Cooling oil duct salt core sintering method in a kind of aluminum piston, including first stage and second stage, wherein described
One stage was to keep the temperature -3 hours 1 hour after the salt core sintering temperature after turning is warming up to 80 DEG C -200 DEG C by 20 DEG C -30 DEG C, institute
State second stage be sintering temperature is warming up to 600 DEG C -700 DEG C after keep the temperature -3 hours 1 hour, then naturally cool to 20 DEG C -
30℃。
Preferably, the heating-up time of above-mentioned first stage is -1 hour 0.5 hour.
Preferably, the heating-up time of above-mentioned second stage is -4 hours 1 hour.
Preferably, the above-mentioned first stage is to be warming up to 100 DEG C -150 DEG C.
Preferably, the above-mentioned first stage keeps the temperature 2-3 hours, and the second stage keeps the temperature 2.5-3 hours.
Preferably, above-mentioned second stage is to be warming up to 630 DEG C -670 DEG C.
Preferably, the above-mentioned first stage is holding Current Temperatures guarantor after the arbitrary temp being warming up within the scope of 80 DEG C -200 DEG C
Temperature -3 hours 1 hour.
Preferably, above-mentioned second stage is that will protect after arbitrary temp that sintering temperature is warming up within the scope of 600 DEG C -700 DEG C
It holds Current Temperatures and keeps the temperature -3 hours 1 hour.
Preferably, the above-mentioned first stage is to start to warm up molding salt core sintering temperature by 25 DEG C.
Preferably, 25 DEG C are naturally cooled to.
Cooling oil duct salt core sintering method in aluminum piston provided by the invention, including first stage and second stage,
In, the first stage is that heat preservation 1 is small after the salt core sintering temperature after turning is warming up to 80 DEG C -200 DEG C by 20 DEG C -30 DEG C
When -3 hours, the second stage be sintering temperature is warming up to 600 DEG C -700 DEG C after keep the temperature -3 hours 1 hour, then naturally
It is cooled to 20 DEG C -30 DEG C.
Using the salt core sintering method of cooling oil duct in aluminum piston provided by the invention, can be realized:
1. burning out salt core expansion rate 8 ‰ -12 ‰ by new burning process, and same furnace compared with existing salt core is fired
Intensity difference between salt core is not more than 15%；
2. the salt core strength enhancing 10%-15% burnt out by new process, geomery variable quantity is small, and the whole of salt core closes
Lattice rate promotes 10% or more；
3. the comprehensive qualified rate of salt core is promoted, working time is saved, it is opposite to improve the qualification rate of aluminum piston blank, it reduces
Piston manufacturing cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is that the process of cooling oil duct salt core sintering method production method in aluminum piston provided in an embodiment of the present invention is shown
It is intended to.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is cooling oil duct salt core sintering method production side in aluminum piston provided in an embodiment of the present invention
The flow diagram of method.
Cooling oil duct salt core sintering method in aluminum piston provided in an embodiment of the present invention, including first stage and second-order
Section, wherein the first stage is that heat preservation 1 is small after the salt core sintering temperature after turning is warming up to 80 DEG C -200 DEG C by 20 DEG C -30 DEG C
When -3 hours, second stage is to keep the temperature -3 hours 1 hour after sintering temperature is warming up to 600 DEG C -700 DEG C, then natural cooling
To 20 DEG C -30 DEG C, such as it is cooled to room temperature.
Using the salt core sintering method of cooling oil duct in aluminum piston provided by the invention, can be realized:
1. burning out salt core expansion rate 8 ‰ -12 ‰ by new burning process, and same furnace compared with existing salt core is fired
Intensity difference between salt core is not more than 15%；
2. the salt core strength enhancing 10%-15% burnt out by new process, geomery variable quantity is small, and the whole of salt core closes
Lattice rate promotes 10% or more；
3. the comprehensive qualified rate of salt core is promoted, working time is saved, it is opposite to improve the qualification rate of aluminum piston blank, it reduces
Piston manufacturing cost.
In order to advanced optimize above scheme, specifically, the heating-up time of first stage is -1 hour 0.5 hour.Second
The heating-up time in stage is -4 hours 1 hour.First stage is to be warming up to 100 DEG C -150 DEG C.Second stage is to be warming up to 630
℃-670℃.First stage is holding Current Temperatures heat preservation 1 hour -3 after the arbitrary temp being warming up within the scope of 80 DEG C -200 DEG C
Hour.Second stage is holding Current Temperatures heat preservation 1 after the arbitrary temp that sintering temperature is warming up within the scope of 600 DEG C -700 DEG C
- 3 hours hours.First stage is to start to warm up molding salt core sintering temperature by room temperature, such as 25 DEG C.Naturally cool to 25
℃。
Wherein, the first stage keeps the temperature 2-3 hours, and second stage keeps the temperature 2.5-3 hours.
Cooling oil duct salt core sintering method in aluminum piston provided in an embodiment of the present invention is oil cooling passage in a kind of aluminum piston
With salt core burning process, specific sintering process are as follows: salt core uniform coding is placed in baking furnace after the completion of turning, and the sintering first stage is used
Salt core is warming up to 80-200 DEG C of heat preservation 1-3h (t2) by the time of 0.5-1h (t1), and second stage is with 1-4h (t3) by sintering temperature
Rise to 600-700 DEG C of heat preservation 1-3h (t4) cooled to room temperature afterwards.
Using above-mentioned salt core burning process:
Salt core is first warming up to 80-200 DEG C of heat preservation 1-3h by the first stage, can be realized:
1. can effectively guarantee that salt core is heated evenly early period, moisture in each salt core is sufficiently dried；
2. would generally participate in the bonding agent (such as sodium metasilicate) of low melting point in salt fines, which can also be effectively ensured these
Bonding agent is completely melt, and is uniformly filled in the gap of salt fines.
Therefore, the first stage of firing is the key step for promoting salt core intensity, guaranteeing salt core expansion rate and strength consistency
Suddenly；
Furnace temperature is risen to 600-700 DEG C of heat preservation 1-3h again by second stage, then is the entirety in order to solidify salt fines, promote salt core
Intensity, temperature controlling range is looser compared with existing burning process, and plant site operation is freer.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. cooling oil duct salt core sintering method in a kind of aluminum piston, which is characterized in that including first stage and second stage,
In, the first stage is that heat preservation 1 is small after the salt core sintering temperature after turning is warming up to 80 DEG C -200 DEG C by 20 DEG C -30 DEG C
When -3 hours, the second stage be sintering temperature is warming up to 600 DEG C -700 DEG C after keep the temperature -3 hours 1 hour, then naturally
It is cooled to 20 DEG C -30 DEG C.
2. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the first stage
Heating-up time be -1 hour 0.5 hour.
3. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the second stage
Heating-up time be -4 hours 1 hour.
4. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the first stage
To be warming up to 100 DEG C -150 DEG C.
5. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the first stage
Heat preservation 2-3 hours, the second stage keep the temperature 2.5-3 hours.
6. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the second stage
To be warming up to 630 DEG C -670 DEG C.
7. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the first stage
To keep Current Temperatures to keep the temperature -3 hours 1 hour after the arbitrary temp that is warming up within the scope of 80 DEG C -200 DEG C.
8. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the second stage
To keep Current Temperatures to keep the temperature -3 hours 1 hour after arbitrary temp that sintering temperature is warming up within the scope of 600 DEG C -700 DEG C.
9. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that the first stage
For molding salt core sintering temperature is started to warm up by 25 DEG C.
10. cooling oil duct salt core sintering method in aluminum piston as described in claim 1, which is characterized in that naturally cool to
25℃。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002496.0A CN108994262A (en) | 2018-08-30 | 2018-08-30 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002496.0A CN108994262A (en) | 2018-08-30 | 2018-08-30 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
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| CN108994262A true CN108994262A (en) | 2018-12-14 |
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ID=64594134
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| CN201811002496.0A Pending CN108994262A (en) | 2018-08-30 | 2018-08-30 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
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Citations (6)
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|---|---|---|---|---|
| CN1994615A (en) * | 2006-12-11 | 2007-07-11 | 东风汽车有限公司 | Salt core of engine piston and preparation method |
| CN201170691Y (en) * | 2007-12-31 | 2008-12-24 | 南京长江工业炉科技有限公司 | Sintering furnace for salt core |
| CN101391280A (en) * | 2007-09-18 | 2009-03-25 | 山东滨州渤海活塞股份有限公司 | Special-shaped salt core for press casting |
| CN101869963A (en) * | 2010-07-06 | 2010-10-27 | 湖南江滨机器（集团）有限责任公司 | Foundry water-soluble composite salt core material, salt core preparation method and prepared salt core |
| CN106925749A (en) * | 2017-03-01 | 2017-07-07 | 中国兵器科学研究院宁波分院 | The extrusion casint aluminum piston preparation method of high pressure resistant salt core |
| CN107812895A (en) * | 2017-12-07 | 2018-03-20 | 滨州渤海活塞有限公司 | A kind of method of salt core compacting tool set and its salt core of manufacture and its manufacture salt core |
-
2018
- 2018-08-30 CN CN201811002496.0A patent/CN108994262A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994615A (en) * | 2006-12-11 | 2007-07-11 | 东风汽车有限公司 | Salt core of engine piston and preparation method |
| CN101391280A (en) * | 2007-09-18 | 2009-03-25 | 山东滨州渤海活塞股份有限公司 | Special-shaped salt core for press casting |
| CN201170691Y (en) * | 2007-12-31 | 2008-12-24 | 南京长江工业炉科技有限公司 | Sintering furnace for salt core |
| CN101869963A (en) * | 2010-07-06 | 2010-10-27 | 湖南江滨机器（集团）有限责任公司 | Foundry water-soluble composite salt core material, salt core preparation method and prepared salt core |
| CN106925749A (en) * | 2017-03-01 | 2017-07-07 | 中国兵器科学研究院宁波分院 | The extrusion casint aluminum piston preparation method of high pressure resistant salt core |
| CN107812895A (en) * | 2017-12-07 | 2018-03-20 | 滨州渤海活塞有限公司 | A kind of method of salt core compacting tool set and its salt core of manufacture and its manufacture salt core |
Non-Patent Citations (2)
| Title |
|---|
| 瞿云: "压铸用可溶性盐芯的工艺研究", 《太原机械学院学报》 * |
| 韩彦军等: "盐芯铝活塞及其制造", 《现代制造工程》 * |
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Application publication date: 20181214 |