CN107590315A - A kind of design method of asymmetric rising head - Google Patents
A kind of design method of asymmetric rising head Download PDFInfo
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- CN107590315A CN107590315A CN201710697381.7A CN201710697381A CN107590315A CN 107590315 A CN107590315 A CN 107590315A CN 201710697381 A CN201710697381 A CN 201710697381A CN 107590315 A CN107590315 A CN 107590315A
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- rising head
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- shrinkage cavity
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Abstract
A kind of design method of asymmetric rising head, designed casting system is imported into casting simulation software, carry out casting simulation, analyze situation of the rising head in casting, and symmetrical rising head is designed accordingly, simulated again, when symmetrical rising head can not still draw shrinkage cavity after being adjusted, asymmetric rising head is added on casting system, cast by the skew of asymmetric amount in one direction to carry out multiple simulation, and then the position of asymmetric rising head is determined, then the size of asymmetric rising head is finely adjusted in proportion, to obtain smallest size of asymmetric rising head.On the one hand the method for the present invention eliminates the shrinkage cavity inside titanium alloy casting, reach the purpose that conventional rising head can not effectively draw defect, on the other hand solve the problems, such as that conventional rising head must expect that rate is low.
Description
Technical field
The invention belongs to Ti alloy casting field, particularly relates to a kind of design method of asymmetric rising head, on the one hand
The shrinkage cavity inside titanium alloy casting is eliminated, reaches the purpose that conventional rising head can not effectively draw defect, is on the other hand solved often
Rule rising head must expect the problem of rate is low.
Background technology
Shrinkage cavity defect during Ti alloy casting has had a strong impact on the quality of casting, comes especially for thick and large casting
Say, feeding is difficult, and the internal shrinkage of formation is larger（Typically >=10mm）.On the one hand the defect turns into the weak area of casting, shadow
The mechanical performance of casting is rung, on the one hand causes casting in high temperature insostatic pressing (HIP)（HIP）Surface forms huge static pressure pit afterwards, causes to cast
Part deforms.In view of the above-mentioned problems, existing technological means generally requires sets corresponding rising head at the position that shrinkage cavity easily occurs, with
Just the feeding environment created, casting is drawn into shrinkage cavity, subsequently the method by cutting rising head again, will be gone with defective position
Place is fallen, so as to obtain not having defective casting body.
For Ti alloy casting, rising head with there is its limitation.This with casting structure, group weldering mode, pour cast
Formula has relation.Design method one kind of rising head is analysis casting structure feature at present, is sentenced by theory analysis and practical experience
Break and the position that shrinkage cavity easily occurs, and design corresponding rising head.Another kind is point for finding shrinkage cavity in advance by simulation softward
Cloth rule, find optimal Feeder Design scheme.We at present more uses above-mentioned second of design method.But for some special
For structure, conventional rising head can not effectively draw the shrinkage cavity of cast-internal, and no matter Riser Dimensions are designed with much, lack
Falling into still can not eliminate.In addition, conventional rising head must expect that rate is low, unnecessary waste is caused.Therefore in view of the above-mentioned problems, we
A kind of Feeder Design method is innovated, to solve the problems, such as that such conventional rising head can not draw shrinkage cavity and must expect that rate is low.
The content of the invention
It is an object of the invention to provide a kind of design method of asymmetric rising head, for normal during existing Ti alloy casting
Rule rising head can not effectively draw shrinkage cavity defect and must expect the problem of rate is low, asymmetric rising head be designed, to can not by conventional rising head
The defects of extraction, draws casting, and then improves the internal soundness of casting, reduces follow-up repair welding and finishing, improves product quality；Together
Shi Tigao must expect rate, reduce the cost of raw material.This method designs and implements have operability, positive effect, disclosure satisfy that reality
Border production requirement.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：A kind of design side of asymmetric rising head
Method, this method comprise the following steps：
（1）, design according to casting structure the threedimensional model of casting system, casting system do not add rising head；
（2）, the threedimensional model of designed casting system imported into casting simulation software obtain casting system A, and in software
Cast parameters and selection solidification mode are set, carry out simulation casting, cast-internal shrinkage cavity is distributed, counts when finally giving no rising head
Amount and size cases；
（3）, according to step（2）Analog result, symmetrical rising head is added in casting system A, casting system B is obtained, symmetrically emits
The axis of mouth overlaps with the axis of shrinkage cavity in casting；
（4）, by step（3）In casting system B according to step（2）Carry out casting simulation, distribution of the analysis shrinkage cavity in casting,
Quantity and size cases, and and step（2）Analog result contrasted, when comparing result display addition symmetrical rising head to contracting
When hole plays a role in improving, increase the size of symmetrical rising head, and carry out simulation casting again, to determine that can shrinkage cavity be obtained into one
The improvement of step；
（5）, connect step（4）, after symmetrical Riser Dimensions are increased, shrinkage cavity can not be completely eliminated through simulation or shrinkage cavity can not be carried out
, it is necessary to carry out the design of asymmetric rising head during improvement, the axis of rising head and the axis of shrinkage cavity are misaligned in asymmetric rising head, non-right
The distance between axis and shrinkage cavity axis of rising head are referred to as asymmetric amount, when adding asymmetric rising head on casting system A, with contracting
On the basis of axially bored line, gradually the mode of increasing or decreasing enters line displacement to asymmetric amount in one direction, obtains asymmetric amount not
Same casting system C, and according to step（2）Method casting simulation is carried out to casting system C, and analyze under different asymmetric amounts
Distribution, quantity and size cases of the shrinkage cavity in casting；
（6）, according to step（5）Sunykatuib analysis result, determine the optimal asymmetric amount of asymmetric rising head, and emit as asymmetric
The design attitude of mouth, is then finely adjusted to the size of asymmetric rising head, is reduced on the basis of full size, if finding contracting
When hole does not have the reduction because of asymmetric Riser Dimensions and reappeared, then the size of asymmetric rising head can be continued to zoom out, with
This is analogized until obtaining smallest size of asymmetric rising head.
Further, the casting simulation software is China's casting simulation softward.
Further, the step（5）In the skew of asymmetric rising head when towards the big side of casting section thickness enter line displacement.
Further, the step（6）In when being reduced to asymmetric Riser Dimensions, according to 1 ~ 0.8 diminution ratio
Carry out.
Further, the direction of the described gradual increasing or decreasing of asymmetric amount be X to, Y-direction, Z-direction or axial direction.
Compared with prior art, the beneficial effects of the invention are as follows：
First, the defects of method of the invention can not draw conventional rising head, draws casting, and then improves the internal soundness of casting,
Follow-up repair welding and finishing are reduced, improves product quality；Rate must be expected by improving simultaneously, reduce the cost of raw material.This method designs and reality
Apply with operability, positive effect, disclosure satisfy that actual production demand.
Second, in the Feeder Design of routine, often in order to preferably by defect extraction casting, it is necessary to increase the chi of rising head
It is very little, it certainly will so will result in the waste of casting liquid；And the asymmetric rising head designed by the present invention can ensure to draw shrinkage cavity
While defect, Riser Dimensions are greatly reduced, therefore can obviously reduce the waste of casting liquid, the reason for producing this phenomenon is main
It is because symmetrical rising head and asymmetric rising head heat distribution and heat transfer in the final set stage are different.For pair of routine
Claim for rising head, in final set, heat is mainly distributed on the top of rising head, and this is also the position that shrinkage cavity occurs, such a
The heat transfer of rising head is top-down, that is to say, that the addition of symmetrical rising head causes shrinkage cavity gradually to float, when rising head reaches
During certain altitude, shrinkage cavity can all go up emersion casting, thus reach the purpose for drawing shrinkage cavity；And for asymmetric rising head,
Due to there is no rising head presence in cast top major part region, shrinkage cavity can not be floated, thus above-mentioned principle be not suitable for it is non-
Symmetrical rising head；And from the point of view of the heat distribution at asymmetric rising head final set position, it is distributed a kind of uniform state that presents, i.e.,
The heat regularity of distribution of the symmetrical rising head in axial direction has been broken in the addition of asymmetric rising head, and heat distribution is transmitted along radial direction,
First solidified away from the position of rising head, close to the rear solidification of rising head, diametrically close to the state of consecutive solidification, and then by casting
Internal shrinkage approach from a distance guides rising head into, and finally shrinkage cavity is floated again and draws casting.
Embodiment
Below by specific embodiment, technical scheme is further described.
A kind of design method of asymmetric rising head, this method comprise the following steps：
（1）The threedimensional model of casting system is designed according to casting structure in three-dimensional drawing software, casting system does not add rising head,
According to different casting structure features, casting system can be divided into top pouring type, bottom filling, side note formula；
（2）The threedimensional model of designed casting system is imported into China's casting simulation softward and obtains casting system A, and is set in software
Cast parameters are put, such as formwork thickness, alloy density, casting time etc., wherein formwork thickness is arranged to 15 ± 3mm, alloy density
4.5 ± 0.1mm is arranged to, casting time is traditionally arranged to be 5~10s；Suitable solidification mode is selected after being provided with, carries out mould
Intend casting, the distribution of cast-internal shrinkage cavity, quantity and size cases when finally giving no rising head；
（3）According to step（2）Analog result, symmetrical rising head is added in casting system A, obtains casting system B, symmetrical rising head
Axis overlapped with the axis of shrinkage cavity in casting, Riser Dimensions can reasonably be designed according to shrinkage cavity size；
（4）By step（3）In casting system B according to step（2）Carry out casting simulation, distribution of the analysis shrinkage cavity in casting,
Quantity and size cases, and and step（2）Analog result contrasted, show the symmetrical rising head of addition to shrinkage cavity after contrast
When playing a role in improving, increase the size of symmetrical rising head, and carry out simulation casting again, to determine that can shrinkage cavity obtain further
Improvement；
（5）Connect step（4）, after Riser Dimensions are increased, shrinkage cavity can not be completely eliminated through simulation or shrinkage cavity can not be improved
When, it is necessary to carry out the design of asymmetric rising head, the axis of rising head and the axis of shrinkage cavity are misaligned in asymmetric rising head, asymmetric to emit
The distance between axis and shrinkage cavity axis of mouth are asymmetric amount, when adding asymmetric rising head on casting system A, with shrinkage cavity axle
On the basis of line, asymmetric amount in one direction, usually X, Y, Z or axial direction, by 5mm, 10mm, 15mm, 20mm, 25mm,
30mm mode enters line displacement, obtains the different casting system C of asymmetric amount, and according to step（2）Method to casting system C
Casting simulation is carried out, and analyzes distribution, quantity and size cases of the shrinkage cavity in casting；
（6）According to step（5）Sunykatuib analysis result, the design attitude of asymmetric rising head is determined, then to asymmetric rising head
Size is finely adjusted, and is reduced on the basis of full size according to 1 ~ 0.8 diminution ratio, if find shrinkage cavity not because
The reduction of asymmetric Riser Dimensions and when reappearing, then the size of asymmetric rising head can be continued to zoom out, by that analogy until obtaining
Obtain smallest size of asymmetric rising head.
Preferably, wherein entering line displacement towards the big side of casting section thickness when asymmetric rising head is offset.
After the design of asymmetric rising head is completed, asymmetric rising head wax-pattern is made on wax machine is penetrated, by asymmetric wax-pattern
It is combined with modelling wax module, forms the casting system of material object, and cast molding casting, finally cut rising head, observe shrinkage cavity
Whether casting, proof theory and actual difference are drawn.
Example 1：In terms of drawing chips defect
The tail ring casting of certain company customization, overall size is Ф 220mm × 160mm, wall thickness 22mm.Due to the product wall thickness compared with
Thickness, and Thickness Distribution is uneven, and casting can not be drawn using shrinkage cavity during in general rising head.Demonstrated such as according to the design procedure of the present invention
Under：
1st, designed casting system is imported into China's casting simulation softward, carries out simulation casting, obtain distribution of the shrinkage cavity in casting
Situation and the size of shrinkage cavity, quantity；
2nd, symmetrical rising head is added in casting system, and carries out simulation casting, find symmetrical rising head can only extension shrinkage cavity, and
In the case where increasing Riser Dimensions, shrinkage cavity still can not be drawn completely；
3rd, asymmetric rising head is added on casting system, and carries out simulation casting, through analysis, the shrinkage cavity of cast-internal is all drawn
Go out casting.
Example 2：Improve in terms of must expecting rate
Certain company customizes Titanium alloy fan impeller casting, and overall size is Ф 810mm × 290mm, thick area's wall thickness 57mm.Due to this
The wall thickness of product is thicker, and Thickness Distribution is uneven, must expect that rate is relatively low during using in general rising head.
1st, designed casting system is imported into China's casting simulation softward, carries out simulation casting, obtain shrinkage cavity in casting
Distribution situation and the size of shrinkage cavity, quantity；
2nd, symmetrical rising head is added in casting system, and carries out simulation casting, it is found that symmetrical rising head can draw whole shrinkage cavities, but
It is to compare waste of materials, its medium casting weight：540Kg, rising head：192Kg, obtain material rate：73.7%；
3rd, asymmetric rising head is added on casting system, and carries out simulation casting, through analysis, the shrinkage cavity of cast-internal is all drawn
Go out casting, its medium casting weight：540Kg, rising head：100Kg, obtain material rate：84.3%, obtain material rate lifting 10.6%.
Claims (5)
- A kind of 1. design method of asymmetric rising head, it is characterised in that：This method comprises the following steps：（1）, design according to casting structure the threedimensional model of casting system, casting system do not add rising head；（2）, the threedimensional model of designed casting system imported into casting simulation software obtain casting system A, and in software Cast parameters and selection solidification mode are set, carry out simulation casting, cast-internal shrinkage cavity is distributed, counts when finally giving no rising head Amount and size cases；（3）, according to step（2）Analog result, symmetrical rising head is added in casting system A, casting system B is obtained, symmetrically emits The axis of mouth overlaps with the axis of shrinkage cavity in casting；（4）, by step（3）In casting system B according to step（2）Carry out casting simulation, distribution of the analysis shrinkage cavity in casting, Quantity and size cases, and and step（2）Analog result contrasted, when comparing result display addition symmetrical rising head to contracting When hole plays a role in improving, increase the size of symmetrical rising head, and carry out simulation casting again, to determine that can shrinkage cavity be obtained into one The improvement of step；（5）, connect step（4）, after symmetrical Riser Dimensions are increased, shrinkage cavity can not be completely eliminated through simulation or shrinkage cavity can not be carried out , it is necessary to carry out the design of asymmetric rising head during improvement, the axis of rising head and the axis of shrinkage cavity are misaligned in asymmetric rising head, non-right The distance between axis and shrinkage cavity axis of rising head are referred to as asymmetric amount, when adding asymmetric rising head on casting system A, with contracting On the basis of axially bored line, gradually the mode of increasing or decreasing enters line displacement to asymmetric amount in one direction, obtains asymmetric amount not Same casting system C, and according to step（2）Method casting simulation is carried out to casting system C, and analyze under different asymmetric amounts Distribution, quantity and size cases of the shrinkage cavity in casting；（6）, according to step（5）Sunykatuib analysis result, determine the optimal asymmetric amount of asymmetric rising head, and emit as asymmetric The design attitude of mouth, is then finely adjusted to the size of asymmetric rising head, is reduced on the basis of full size, if finding contracting When hole does not have the reduction because of asymmetric Riser Dimensions and reappeared, then the size of asymmetric rising head can be continued to zoom out, with This is analogized until obtaining smallest size of asymmetric rising head.
- A kind of 2. design method of asymmetric rising head according to claim 1, it is characterised in that：The casting simulation software Simulation softward is cast for China.
- A kind of 3. design method of asymmetric rising head according to claim 1, it is characterised in that：The step（5）In it is non- Enter line displacement towards the big side of casting section thickness during symmetrical rising head skew.
- A kind of 4. design method of asymmetric rising head according to claim 1, it is characterised in that：The step（6）In it is right When asymmetric Riser Dimensions are reduced, carried out according to 1 ~ 0.8 diminution ratio.
- A kind of 5. design method of asymmetric rising head according to claim 1, it is characterised in that：Described asymmetric amount by Gradually the direction of increasing or decreasing be X to, Y-direction, Z-direction or axial direction.
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| CN201710697381.7A CN107590315B (en) | 2017-08-15 | 2017-08-15 | Design method of asymmetric riser |
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Cited By (3)
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| CN110976791A (en) * | 2019-12-28 | 2020-04-10 | 西南铝业（集团）有限责任公司 | Self-spinning shunting bag and aluminum alloy casting method |
| CN113373502A (en) * | 2021-04-28 | 2021-09-10 | 潍坊科技学院 | Process method for controlling freckle defect in single crystal casting |
| WO2021223469A1 (en) * | 2020-05-08 | 2021-11-11 | 上海交通大学 | Test rod design method and system for evaluating influence of loosening defect on mechanical property |
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| WO2021223469A1 (en) * | 2020-05-08 | 2021-11-11 | 上海交通大学 | Test rod design method and system for evaluating influence of loosening defect on mechanical property |
| CN113373502A (en) * | 2021-04-28 | 2021-09-10 | 潍坊科技学院 | Process method for controlling freckle defect in single crystal casting |
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| CN107590315B (en) | 2020-06-16 |
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