CN107243619A - A kind of preparation technology of the large-scale liner plate of isothermal solidification - Google Patents
A kind of preparation technology of the large-scale liner plate of isothermal solidification Download PDFInfo
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- CN107243619A CN107243619A CN201710495980.0A CN201710495980A CN107243619A CN 107243619 A CN107243619 A CN 107243619A CN 201710495980 A CN201710495980 A CN 201710495980A CN 107243619 A CN107243619 A CN 107243619A
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- chill
- built
- liner plate
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- molten steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The present invention relates to a kind of preparation technology of the large-scale liner plate of isothermal solidification, by setting cooled and solidified to intervene the isothermal solidification that condition realizes large-scale liner plate, in chill built in large-scale liner plate maximum gauge position of sound production.Preparation technology, comprises the following steps：Quality first by calculating built-in chill；Geomery that molten steel determines built-in chill in " respectively to heat conduction rate principle of identity in mold cavity " and " minimum dimension direction heat energy can meet chill melting principle " is then based on, the appearance and size and the riding position of built-in chill of chill built in trying to achieve is calculated；Make built-in chill, and its safe is placed in mould form；The qualified molten steel of casting composition, you can realize the isothermal solidification of large-scale liner plate.This invention ensures that composition is uniform inside and outside large-scale liner plate, core feeding is abundant, microdefect is few.
Description
Technical field
The present invention relates to field of material technology, the preparation technology of specifically a kind of large-scale liner plate of isothermal solidification.
Background technology
With the development of mining industry, mining industry crushing and grinding equipment increasingly tends to maximization, while crushing and grinding equipment liner plate material
Expect also more and more large-scale, thick and heavyization.The maximizing of liner plate, thick and heavyization propose higher, more harsh requirement to its manufacturing process.
Because single tissue molten steel is more in large-scale liner plate process of setting, crystallization release heat energy is more, in the larger position of wall thickness due to leading
Thermal effect difference easily gathers a large amount of heat energy, and crystallization rate is slow, and it is that easy forming core atom is fast in liquid metal to bring direct result
Speed diffusion, quickly gathers in liner plate core crystallization line front end, the liner plate core beneficiating ingredient missing solidified after causing.Meanwhile,
In time sequencing, due to crystallization and freezing after liner plate core, solidification shrinkage is the external structure that molten steel supplement passage is preferentially solidified
Block, easily cause that liner plate core is loose and Micro porosity.Liner plate core structure property is directly affected, macro manifestations are liner plate core
Portion's anti-wear performance is poor.
Such as diameter is more than 10m large-sized grinder liner plate, and its cross section is trapezium structure, using chrome molybdenum composition of steel,
In height composition, hardness, impact value are detected for 340mm trapezoidal cross-section every 10mm samplings from top to bottom.As a result it is shown in
There is Micro porosity apart from surface 80mm positions；The essential element Cr formed apart from surface 100mm positions there is provided martensite,
The elements such as Mo, Mn, Si about reduce 3-5% compared with top layer, hence it is evident that form component segregation.Through hardening sexual factor, composition when removing heat treatment
Segregation is to cause that large-scale liner plate core hardness is high, the main cause that wearability is not enough.
It is not only large-scale liner plate manufacturing process and there is above-mentioned puzzlement, the larger parts of Casting process of other wall thickness is equally existed
State problem, therefore further investigate that composition in rational heavy castings casting technique, manufacture table is uniform, less large-scale of internal flaw
Casting is the task of top priority of the vast material scientific worker of China.
The content of the invention
The present invention seeks to the deficiency for solution above-mentioned technical problem, there is provided a kind of preparation work of the large-scale liner plate of isothermal solidification
Skill, obtains cooled and solidified using the computational methods of the present invention and intervenes condition（Built-in chill）Appearance and size and riding position, it is real
The isothermal solidification of large-scale liner plate casting process is showed.
The present invention is for the technical scheme that is used of solution above-mentioned technical problem：
A kind of preparation technology of the large-scale liner plate of isothermal solidification, by setting cooled and solidified to intervene the isothermal that condition realizes large-scale liner plate
Solidification, in chill built in large-scale liner plate maximum gauge position of sound production.
The preparation technology of the large-scale liner plate of isothermal solidification, comprises the following steps：
Step 1: the quality of built-in chill is obtained by following algorithm first：
In formula：--- molten steel temperature loss coefficient, typically take 0.58-0.62；
--- the crystallization release heat energy of body molten steel, J；
--- built-in chill fusing absorbs heat energy, J；
In formula：The specific heat capacity of c --- molten steel, typically takes 450J/Kg. DEG C；
--- the quality of body molten steel, Kg；
--- the cast temperature of molten steel, DEG C；
--- the complete liquidus temperature of body molten steel, DEG C；
In formula：C --- the specific heat capacity of built-in chill, typically takes 450J/Kg. DEG C；
--- the liquidus temperature of built-in chill, typically take 1535-1539 DEG C；
--- room temperature；
In formula：C --- the specific heat capacity of built-in chill, typically takes 450J/Kg. DEG C；
--- the fusing point of pure iron, typically take 1535-1539 DEG C；
--- temperature coefficient, every kind of element correspondence fixed value；
--- constituent element i actual mass fraction, % in molten steel；
--- the element such as C, Si, Mn, P, S, Al, Cr；
--- the gas such as nitrogen in steel, hydrogen, oxygen to the temperature coefficient of the combined influence of pure iron fusing point, DEG C
Step 2: based on molten steel is at " in mold cavity each to heat conduction rate principle of identity " and " minimum dimension direction heat energy can be with
Meet chill melting principle " geomery of chill built in determination,；The profile for trying to achieve built-in chill is calculated based on below equation
The riding position of size and built-in chill；
In formula：--- the length dimension of built-in chill, m；
--- the length dimension of part, m；
--- the density of chill, Kg/m3；
--- the minimum thickness of part, m；
Step 3: passing through above-mentioned formula（1）-（5）Make built-in chill, and its safe is placed in mould form.It is cast into
The molten steel of division lattice, you can realize the isothermal solidification of large-scale liner plate.By the large-scale liner plate after the completion of casting in die cavity inside holding extremely
Unpacked after room temperature.Sand removal processing is carried out to large-scale liner plate.It is heat-treated according to large-scale lining material characteristic.
Beneficial effect is：
1st, in the large-scale liner plate preparation method of isothermal solidification of the present invention, obtain cooled and solidified using the computational methods of the present invention and intervene bar
Part（Built-in chill）Appearance and size and riding position, the computational methods obtain theoretical calculation according to being heat conservation law；Realize
The isothermal solidification of large-scale liner plate casting process, it is ensured that composition is uniform inside and outside large-scale liner plate, core feeding fully, microdefect
It is few.
2nd, cost of the present invention is low, without new equipment addition and existing equipment Improvement requirement in manufacturing process.Solidify intervention condition
（Built-in chill）Appearance and size, riding position algorithm highly versatile, are applicable not only to the manufacture of large-scale liner plate, other thick and large castings
It can also be applicable；Isothermal solidification effect is good, and part dense structure, composition is uniform.
Brief description of the drawings
Fig. 1 is chill schematic diagram built in liner plate in embodiments of the invention 1；
Fig. 2 is profile of the liner plate at A-A in embodiments of the invention 1；
Fig. 3 is chill schematic diagram built in liner plate in embodiments of the invention 2；
Fig. 4 is profile of the liner plate at B-B in embodiments of the invention 2；
Mark is in figure：1st, built-in chill.
Embodiment
Embodiments of the invention only with illustrate and not to limit technical scheme.The calculation of built-in chill in the present invention
Method has originality, is not only useful in the manufacturing of large-scale liner plate, produces equally applicable to other thick and large castings.Specific zero
The replacement of part should be covered in the claimed of the present invention.
Embodiment 1
Large-scale liner plate manufactured in the present embodiment is with diameter 10.3m semi-autogenous mill, and liner plate profile full-size is 340mm*
960mm*1980mm, substance 2.35T, material is steel alloy, specific composition such as following table：
Table 1：The liner plate component list of embodiment 1
According to formula（1）-（5）Calculate and try to achieve the complete liquidus temperature of above-mentioned material for 1478 DEG C, 20 DEG C, 1580 DEG C go out in room temperature
Steel is cast, and the quality of built-in chill is 91.8Kg；Solidify intervention condition（Built-in chill）Appearance and size is length 796mm, radius
68mm；Riding position is the center of liner plate.
The large-scale liner plate preparation method of the present embodiment comprises the following steps：
The qualified built-in chill of size, composition is prepared according to above-mentioned result of calculation, and will by diameter about 5mm fine steel rib
It is fixed on the center position of model；
Casting composition is qualified, the molten liquid steel that 1580 DEG C of tapping temperature, and model inside holding is to room temperature, sand removal of unpacking；
Electric furnace heating is carried out to the liner plate after sand removal.
Box resistance heating stove heat, 30 DEG C/H is heated to 360 DEG C of insulations 1H, 80 DEG C/H and is heated to 650 DEG C, is incubated 1H,
100 DEG C/H is heated to 980 DEG C of Putting into water rapidly Quenching Treatments.
The large-scale liner plate as obtained by above-mentioned preparation method, core hardness can reach HRC42, and the lining of isothermal solidification is not taken
Plate core hardness HRC37 is significantly improved, observation core microstructure, the microdefect such as pore-free.The liner plate is applied in molybdenum ore
On ball mill, service life is 1.3 times of the liner plate for not taking isothermal solidification to handle, is reached 4 months.
Embodiment 2
Large-scale liner plate manufactured in the present embodiment is the large-scale liner plate on jaw crusher, and liner plate maximum appearance and size is
1557mm*1256mm*197mm, substance 2.12T, material are high violent steel, specific composition such as following table：
Table 2：The liner plate component list of embodiment 2
| C | Si | Mn | P | S | Cr |
| 0.9~1.3 | 0.3-0.8 | 11.0-14.0 | ≤0.045 | ≤0.04 | 1.5-2.5 |
According to formula（1）-（5）Calculate and try to achieve the complete liquidus temperature of above-mentioned material for 1395 DEG C, 20 DEG C, 1550 DEG C go out in room temperature
Steel is cast, and the quality of built-in chill is 125Kg；Solidify intervention condition（Built-in chill）Appearance and size is length 1080mm, radius
68.5mm.Consider width（1256mm）D-factor, in the case of built-in chill gross mass is constant, be by an original length
The built-in chill that 1080mm, radius are 68.5mm is replaced by built-in chill that two length 1080mm, radius are 48.5mm in width
Degree（1256mm）Uniformly put in direction.
The large-scale liner plate preparation method of the present embodiment comprises the following steps：
The qualified built-in chill of size, composition is prepared according to above-mentioned result of calculation, and will by diameter about 5mm fine steel rib
It is in width（1256mm）Uniformly put in direction；
Casting composition is qualified, the molten liquid steel that 1550 DEG C of tapping temperature, and model inside holding is to room temperature, sand removal of unpacking；
Water Quenching is carried out to the liner plate after sand removal：
Box resistance heating stove heat, 30 DEG C/H is heated to 500 DEG C of insulations 1H, 80 DEG C/H and is heated to 1050 DEG C, is incubated two hours,
Quick such as water Water Quenching.
The large-scale liner plate as obtained by above-mentioned preparation method, surface and core hardness reach HB220, do not take isothermal to coagulate
Solid liner plate core hardness HB185 be significantly improved, observe core microstructure, the microdefect such as pore-free.The liner plate application
On molybdenum ore jaw crusher, service life is 1.2 times of the liner plate for not taking isothermal solidification to handle, is reached 72 days.
Claims (2)
1. a kind of preparation technology of the large-scale liner plate of isothermal solidification, by set cooled and solidified intervene condition realize large-scale liner plate etc.
Temperature solidification, it is characterised in that：In chill built in large-scale liner plate maximum gauge position of sound production.
2. the preparation technology of the large-scale liner plate of isothermal solidification as claimed in claim 1, it is characterised in that：Comprise the following steps：
Step 1: the quality of built-in chill is obtained by following algorithm first：
In formula：--- molten steel temperature loss coefficient, typically take 0.58-0.62；
--- the crystallization release heat energy of body molten steel, J；
--- built-in chill fusing absorbs heat energy, J；
In formula：The specific heat capacity of c --- molten steel, typically takes 450J/Kg. DEG C；
--- the quality of body molten steel, Kg；
--- the cast temperature of molten steel, DEG C；
--- the complete liquidus temperature of body molten steel, DEG C；
In formula：C --- the specific heat capacity of built-in chill, typically takes 450J/Kg. DEG C；
--- the liquidus temperature of built-in chill, typically take 1535-1539 DEG C；
--- room temperature；
In formula：C --- the specific heat capacity of built-in chill, typically takes 450J/Kg. DEG C；
--- the fusing point of pure iron, typically take 1535-1539 DEG C；
--- temperature coefficient, every kind of element correspondence fixed value；
--- constituent element i actual mass fraction, % in molten steel；
--- the element such as C, Si, Mn, P, S, Al, Cr；
--- the gas such as nitrogen in steel, hydrogen, oxygen to the temperature coefficient of the combined influence of pure iron fusing point, DEG C
Step 2: calculating the appearance and size and the riding position of built-in chill for trying to achieve built-in chill based on below equation：
In formula：--- the length dimension of built-in chill, m；
--- the length dimension of part, m；
--- the density of chill, Kg/m3；
--- the minimum thickness of part, m；
Step 3: passing through above-mentioned formula（1）-（5）Make built-in chill, and its safe is placed in mould form；It is cast into
The molten steel of division lattice, you can realize the isothermal solidification of large-scale liner plate；By the large-scale liner plate after the completion of casting in die cavity inside holding extremely
Unpacked after room temperature；Sand removal processing is carried out to large-scale liner plate；It is heat-treated according to large-scale lining material characteristic.
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|---|---|---|---|
| CN201710495980.0A CN107243619B (en) | 2017-06-26 | 2017-06-26 | A kind of preparation process of isothermal solidification large size liner plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710495980.0A CN107243619B (en) | 2017-06-26 | 2017-06-26 | A kind of preparation process of isothermal solidification large size liner plate |
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| CN107243619A true CN107243619A (en) | 2017-10-13 |
| CN107243619B CN107243619B (en) | 2019-03-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01313184A (en) * | 1988-06-09 | 1989-12-18 | Mazda Motor Corp | High alloying method by remelting |
| CN102303212A (en) * | 2011-06-24 | 2012-01-04 | 成都申信达机械有限公司 | Process for manufacturing lining board of wet-spraying machine |
| CN204110778U (en) * | 2014-09-20 | 2015-01-21 | 石嘴山市金圣机械制品厂 | Combined type wear-resisting liner plate |
| CN105568168A (en) * | 2014-10-15 | 2016-05-11 | 成都佰锐建筑安装工程有限公司 | Process for manufacturing lining board of concrete conveyor |
-
2017
- 2017-06-26 CN CN201710495980.0A patent/CN107243619B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01313184A (en) * | 1988-06-09 | 1989-12-18 | Mazda Motor Corp | High alloying method by remelting |
| CN102303212A (en) * | 2011-06-24 | 2012-01-04 | 成都申信达机械有限公司 | Process for manufacturing lining board of wet-spraying machine |
| CN204110778U (en) * | 2014-09-20 | 2015-01-21 | 石嘴山市金圣机械制品厂 | Combined type wear-resisting liner plate |
| CN105568168A (en) * | 2014-10-15 | 2016-05-11 | 成都佰锐建筑安装工程有限公司 | Process for manufacturing lining board of concrete conveyor |
Non-Patent Citations (1)
| Title |
|---|
| 秦春贵等: "双金属材料在高温耐磨衬板铸件中的应用", 《铸造》 * |
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