CN103691921A - Manufacturing method of cavity model for casting mold filling hydraulics simulation - Google Patents
Manufacturing method of cavity model for casting mold filling hydraulics simulation Download PDFInfo
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- CN103691921A CN103691921A CN201310711058.2A CN201310711058A CN103691921A CN 103691921 A CN103691921 A CN 103691921A CN 201310711058 A CN201310711058 A CN 201310711058A CN 103691921 A CN103691921 A CN 103691921A
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Abstract
The invention provides a manufacturing method of a cavity model for casting mold filling hydraulics simulation. The method comprises the steps of performing equal-proportional scaling in three-dimensional modeling software; performing shelling; performing layer-by-layer slicing; guiding sliced files during the slicing process to a laser engraving machine to machine organic glass and further to obtain organic glass sheets; positioning, adhering and assembling every layer of the organic glass sheets; defining the shell thickness of the shelling process as t, the sliding spacing as d and the included angle formed by the contour of a scaled casting three-dimensional solid model between two parallel slices and the two parallel slices as sigma, and defining the minimum value of sigma as sigma min; defining the spacing of the gaps of the scaled casting three-dimensional solid model as l and the minimum value of the l as l min; defining the curvature radius of the contour of the scaled casting three-dimensional solid model as r and the minimum value of the r as r min; defining the evaluation of k to be 15-2.0. A cavity model obtained through the manufacturing method can be randomly complex to be identical to an actual casting in structure, and the thickness of the shell layer of the cavity model can be very thin to achieve good visibility.
Description
Technical field
The present invention relates to casting process hydraulic analogy field, relate in particular to the preparation method of die cavity model for a kind of casting filling hydraulic analogy.
Background technology
In the manufacture process of foundry goods, filling type defect is a quasi-representative and serious casting flaw, such as slag inclusion, volume gas etc.And casting moulding system directly affects cavity filling process.Therefore, the research of Mold Filling Process, designs, improves Filling Processes of Castings defect optimizing pouring system, is significant.
Hydraulic analogy is a kind of conventional means of research Mold Filling Process, the feature have intuitively effectively, cost being low.For a long time, be used to the research of Mold Filling Process, observe cavity filling process, improve running gate system technological design.Hydraulic analogy experiment based on flow field similarity Theoretical Design, can by observe and measure running gate system in cavity filling process assignment of traffic, foundry goods fill type order, liquid level stationarity and inner vortex and volume gas etc., obtain the valid data that enrich about cavity filling process.
Yet there is great difficulty in the making of hydraulic analogy die cavity always.Reason is, this mould form need to meet structural complexity and good visuality simultaneously.In order to realize the visual effect of die cavity transparent interior, generally select transparent organic glass to make material as die cavity, the lucite tube by regular shape or plate etc. form the foundry goods cavity structure of simple shape.When casting structure is very complicated, unless casting structure is simplified largely, otherwise cannot make foundry goods die cavity model.And due to the sensitiveness of flow field to border, the die cavity model after simplification cannot react practical flow field again at all.
On the other hand, when foundry goods is very complicated, when especially casting structure and running gate system are all very complicated, the observation of die cavity is just become to very difficult.Because poly (methyl methacrylate) plate wall thickness differs, the design of outermost contour shape is unreasonable, and by the assembled bonding impact bringing, all can greatly reduce the transparency of lucite die cavity model, makes to observe interior flow field and becomes very difficult.
Therefore, existing die cavity model, all cannot realize that to meet cavity structure consistent with actual foundry goods and reach apparent effect simultaneously.
Summary of the invention
In view of the problem existing in background technology, the object of the present invention is to provide the preparation method of die cavity model for a kind of casting filling hydraulic analogy, it can produce any complicated shape and the foundry goods die cavity consistent with actual casting structure.
Another object of the present invention is to provide the preparation method of a kind of casting filling hydraulic analogy with die cavity model, it can produce the foundry goods die cavity that shell thickness is even and very thin.
A further object of the present invention is to provide the preparation method of a kind of casting filling hydraulic analogy with die cavity model, and it can produce the foundry goods die cavity with good visibility.
To achieve these goals, the invention provides the preparation method of die cavity model for a kind of casting filling hydraulic analogy, it comprises step: in 3D sculpting software, to comprising that the Casting Three-dimensional solid modelling of running gate system carries out equal proportion convergent-divergent, obtain the Casting Three-dimensional solid modelling after convergent-divergent and make the size of the Casting Three-dimensional solid modelling after convergent-divergent reach the size of die cavity model for casting filling hydraulic analogy; Casting Three-dimensional solid modelling after convergent-divergent is taken out to shell, generate foundry goods shell moulding; The foundry goods shell moulding obtaining is carried out to step section, and the distance between section is fixed and is equated; Section file when foundry goods shell moulding is formed to section is directed in laser engraving machine, laser engraving machine according to described section file to thickness equal slice distance from poly (methyl methacrylate) plate process, to form organic sheet glass; By each layer of lucite sheet location, bonding forming, assembling obtains casting filling hydraulic analogy die cavity model; Wherein, the shell thickness of taking out shell of taking out in shell operation is defined as t, and the size of t is set need to meet following relation:
Wherein: d is slice distance, θ is the angle that the profile of the Casting Three-dimensional solid modelling after the convergent-divergent between adjacent two parallel sections forms with described adjacent two parallel sections, and the minimum of a value of θ is defined as θ
min;
L is the spacing in the gap in the Casting Three-dimensional solid modelling after convergent-divergent, and the minimum of a value of l is defined as l
min;
R is the radius of curvature of the profile of the Casting Three-dimensional solid modelling after convergent-divergent, and the minimum of a value of r is defined as r
min;
K is safety coefficient, gets between 1.5～2.0.
Beneficial effect of the present invention is as follows:
Utilization is processed into lucite sheet and is assembled by laser engraving machine by section, can produce any complicated shape and the casting filling hydraulic analogy die cavity model consistent with actual casting structure, the casting filling hydraulic analogy die cavity model that shell thickness is even and very thin can be produced, the casting filling hydraulic analogy die cavity model with good visibility can be produced.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of the Casting Three-dimensional solid modelling after convergent-divergent of the present invention, wherein for the ease of understanding, in the mode of whole clearing, Casting Three-dimensional entity is shown and draws section to increase the weight of lines;
The structural representation that Fig. 2 is the foundry goods shell moulding that obtained by Fig. 1, wherein for the ease of understanding, illustrates Casting Three-dimensional entity and draws section to increase the weight of lines in the mode of whole clearing;
The structural representation that Fig. 3 is the lucite sheet that obtained by Fig. 2;
Fig. 4 is the casting filling hydraulic analogy that obtained by Fig. 3 structural representation with die cavity model, wherein for the ease of understanding, casting filling hydraulic analogy to be shown with respect to translucent and second half the opaque mode of axis direction one, with die cavity model and to increase the weight of lines, draw lucite sheet;
The structural representation that Fig. 5 is another lucite sheet of being obtained by Fig. 2;
Fig. 6 illustrates the profile of the Casting Three-dimensional solid modelling after convergent-divergent and the schematic diagram of the angle between section.
Wherein, description of reference numerals is as follows:
Casting Three-dimensional solid modelling P profile after 1 convergent-divergent
11 cast gate t shell thicknesses
12 hole d spacing
2 foundry goods shell moulding θ angles
3 section l spacing
4 casting filling hydraulic analogy die cavity models
5 lucite sheets
The specific embodiment
Describe with reference to the accompanying drawings the preparation method of die cavity model for casting filling hydraulic analogy according to the present invention in detail.
Referring to figs. 1 through Fig. 6, casting filling hydraulic analogy according to the present invention comprises step by the preparation method of die cavity model 4: in 3D sculpting software, to comprising that the Casting Three-dimensional solid modelling of running gate system carries out equal proportion convergent-divergent, obtain the Casting Three-dimensional solid modelling 1 after convergent-divergent and make the size of the Casting Three-dimensional solid modelling 1 after convergent-divergent reach the size (with reference to Fig. 1) of die cavity model 4 for casting filling hydraulic analogy; Casting Three-dimensional solid modelling 1 after convergent-divergent is taken out to shell, generate foundry goods shell moulding 2(with reference to Fig. 2); The foundry goods shell moulding obtaining 2 is carried out to step section (with reference to Fig. 3 and Fig. 5), and the distance of 3 of cutting into slices is fixed and is equated; Foundry goods shell moulding 2 is formed to the section section file of 3 o'clock and be directed in laser engraving machine, laser engraving machine is processed thickness equal the to cut into slices poly (methyl methacrylate) plate of 3 spacings according to described section file, to form organic sheet glass 5; By each layer of lucite sheet forming 5 location, bonding, assembling obtains casting filling hydraulic analogy and uses die cavity model 4(with reference to Fig. 4); Wherein, the shell thickness of taking out shell of taking out in shell operation is defined as t, and the size of t is set need to meet following relation:
Wherein:
D is slice distance, and θ is the angle that the profile P of the Casting Three-dimensional solid modelling 1 after the convergent-divergent between adjacent two parallel sections 3 forms with described adjacent two parallel sections 3, and the minimum of a value of θ is defined as θ
min;
L is the spacing in the gap (for example the hole in Fig. 1 12, for the groove of the existence in Casting Three-dimensional solid modelling, is also considered as interstitial treatment certainly) in the Casting Three-dimensional solid modelling 1 after convergent-divergent, and the minimum of a value of l is defined as l
min;
R is the radius of curvature of the profile P of the Casting Three-dimensional solid modelling 1 after convergent-divergent, and the minimum of a value of r is defined as r
min;
K is safety coefficient, gets between 1.5～2.0.
Adopt the casting filling hydraulic analogy of invention to utilize laser dicing assembling by the preparation method of die cavity model 4, can produce the foundry goods die cavity of any complicated shape.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, in one embodiment, with reference to Fig. 6, position crossing between profile P by the Casting Three-dimensional solid modelling 1 after convergent-divergent and adjacent two parallel sections 3 is simplified to plane by the profile P of the Casting Three-dimensional solid modelling 1 after the convergent-divergent between adjacent two parallel sections 3, and this plane is θ with the angle that described adjacent two parallel sections 3 form.
Utilize section be processed into lucite sheet and assemble by laser engraving machine, can produce any complicated shape and the casting filling hydraulic analogy die cavity model consistent with actual casting structure, the casting filling hydraulic analogy die cavity model that shell thickness is even and very thin can be produced, the casting filling hydraulic analogy die cavity model with good visibility can be produced.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4,3D sculpting software can be UG, SOLIDWORKS etc.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, work as l
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), increase this l
minthe clearance distance of corresponding position is to 20mm.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, work as r
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), to r
minthe Casting Three-dimensional solid modelling 1 that carry out after convergent-divergent at corresponding turning is revised or adds chamfering, to increase the radius of curvature at this turning, arrives 10mm.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, the distance d of 3 of cutting into slices can be 3mm; The average-size of Casting Three-dimensional solid modelling 1 after convergent-divergent in length direction is about 500mm.The distance of step section is 3mm, selects the poly (methyl methacrylate) plate of same thickness to cut.The poly (methyl methacrylate) plate that the thickness of slicing layer need to and be used is consistent.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, with reference to Fig. 6, work as θ
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), revise this θ
minthe corresponding position of profile P of the Casting Three-dimensional solid modelling 1 after corresponding convergent-divergent is to increase this part angulation θ.Or, also can take out separately shell operation to the profile of this position, when now shell thickness t sets, only need meet minimum of a value requirement, do not need to meet maximum requirement, only need meet following condition:
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, take out shell and can be subregion in the short transverse of the Casting Three-dimensional solid modelling 1 after convergent-divergent and take out shell.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, referring to figs. 1 through Fig. 4, in taking out shell operation, selecting the cast gate 11 of the running gate system of the Casting Three-dimensional solid modelling 1 after convergent-divergent is the open face of taking out shell.The water inlet that guarantees thus to take out the foundry goods shell moulding obtaining after shell is consistent with actual die cavity.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, see figures.1.and.2, select the less direction (in other words, this direction is also to have each layer of direction that machine sheet glass 5 is stacking) of size in the Casting Three-dimensional solid modelling 1 after convergent-divergent to cut into slices.In one embodiment, select that lamellar structure is simple, location is easy to direction and cuts into slices.But owing to relating to the complexity of Casting Three-dimensional solid modelling itself and the complexity of processing and assembling, the direction of section chooses to form the direction of whole section 3 as far as possible.
As shown in Figure 3, some lucite sheet 5 is connected.And some lucite sheet 5 can form independent several, as shown in Figure 5, wherein lucite sheet 5 has 3.For the lucite sheet 5 shown in Fig. 5, need to carry out after laser cutting machined at laser engraving machine, each piece in lucite sheet 5 is taken out and preserved separately, preserve the part staying after poly (methyl methacrylate) plate cutting simultaneously, during as cemented in place, comparison is used.
In preparation method at casting filling hydraulic analogy according to the present invention with die cavity model 4, with reference to Fig. 5, when one deck lucite sheet 5 is divided into a plurality of, to each piece in this layer of lucite sheet 5 position, bonding.In one embodiment, the method for positioning bonding is: on lucite sheet 5, coat without shadow glue, the corresponding section of the contrast whole position of file reverse polyphony, solidifies bonding with ultraviolet lamp irradiation behind location completely.In one embodiment, lucite sheet 5 bonding process are: select the larger one deck lucite sheet 5 in medium position cross section as substrate to a side bonds, a last bonding remaining side.
Utilization without shadow glue before illuminated, be in a liquid state, the characteristic of cementation does not position lucite sheet 5, behind location, with ultraviolet lamp, irradiate curing bonding completely, obtain thus having the die cavity model 4 for casting filling hydraulic analogy of good visibility, can simulate mold filling process of casting for accurate, and can obtain observed result accurately.
Claims (10)
1. a preparation method for die cavity model (4) for casting filling hydraulic analogy, is characterized in that, comprises step:
In 3D sculpting software, to comprising that the Casting Three-dimensional solid modelling of running gate system carries out equal proportion convergent-divergent, obtain the Casting Three-dimensional solid modelling (1) after convergent-divergent and make the size of the Casting Three-dimensional solid modelling (1) after convergent-divergent reach the size of die cavity model (4) for casting filling hydraulic analogy;
Casting Three-dimensional solid modelling (1) after convergent-divergent is taken out to shell, generate foundry goods shell moulding (2);
The foundry goods shell moulding (2) obtaining is carried out to step section, and the distance between section (3) is fixed and is equated;
Section file when foundry goods shell moulding (2) is formed to section (3) is directed in laser engraving machine, and the poly (methyl methacrylate) plate that laser engraving machine equals section (3) spacing according to described section file to thickness is processed, to form organic sheet glass (5);
By each layer of lucite sheet (5) location forming, bonding, assembling obtains die cavity model (4) for casting filling hydraulic analogy;
Wherein, the shell thickness of taking out shell of taking out in shell operation is defined as t, and the size of t is set need to meet following relation:
Wherein: d is slice distance, θ is the angle that the profile (P) of the Casting Three-dimensional solid modelling (1) after the convergent-divergent between adjacent two parallel sections (3) forms with described adjacent two parallel sections (3), and the minimum of a value of θ is defined as θ
min;
L is the spacing in the gap in the Casting Three-dimensional solid modelling (1) after convergent-divergent, and the minimum of a value of l is defined as l
min;
R is the radius of curvature of the profile (P) of the Casting Three-dimensional solid modelling (1) after convergent-divergent, and the minimum of a value of r is defined as r
min;
K is safety coefficient, gets between 1.5～2.0.
2. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that, works as l
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), increase this l
minthe clearance distance of corresponding position is to 20mm.
3. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that, works as r
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), to r
minthe Casting Three-dimensional solid modelling (1) that carry out after convergent-divergent at corresponding turning is revised or adds chamfering, to increase the radius of curvature at this turning, arrives 10mm.
4. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that,
Distance d between section (3) is 3mm;
The average-size of Casting Three-dimensional solid modelling (1) after convergent-divergent in length direction is about 500mm.
5. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that, works as θ
mintoo little while causing being empty set according to the optional scope of the shell thickness t of equation (a), revise this θ
minthe corresponding position of profile (P) of the Casting Three-dimensional solid modelling (1) after corresponding convergent-divergent is to increase this part angulation θ or the profile of this position is taken out separately to shell operation, shell thickness t only need meet minimum of a value requirement while setting, do not need to meet maximum requirement, only need meet following condition:
6. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that, takes out shell for taking out shell in subregion in the short transverse of the Casting Three-dimensional solid modelling (1) after convergent-divergent.
7. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, it is characterized in that, in taking out shell operation, the cast gate (11) of selecting the running gate system of the Casting Three-dimensional solid modelling (1) after convergent-divergent is the open face of taking out shell.
8. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, is characterized in that, when one deck lucite sheet (5) is divided into a plurality of, to each piece in this layer of lucite sheet (5) position, bonding.
9. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 8, it is characterized in that, the method of positioning bonding is: on lucite sheet (5), coat without shadow glue, the corresponding section of the contrast whole position of file reverse polyphony, solidifies bonding with ultraviolet lamp irradiation behind location completely.
10. the preparation method of die cavity model (4) for casting filling hydraulic analogy according to claim 1, it is characterized in that, lucite sheet (5) bonding process is: select the larger one deck lucite sheet (5) in medium position cross section as substrate to a side bonds, a last bonding remaining side.
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Citations (6)
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| CN102423801A (en) * | 2011-11-28 | 2012-04-25 | 清华大学 | Method for mold filling water simulation of cast |
| CN102909356A (en) * | 2012-10-12 | 2013-02-06 | 清华大学 | Hydraulic simulation device capable of controlling ingot segregation and method |
| CN103009633A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Entity manufacturing method based on ultrathin layer wood-plastic composite material |
| CN203324043U (en) * | 2013-06-21 | 2013-12-04 | 清华大学 | Sampling detection device and hydraulic simulation system |
-
2013
- 2013-12-20 CN CN201310711058.2A patent/CN103691921B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340559A (en) * | 2002-05-22 | 2003-12-02 | Toyota Motor Corp | Die casting method |
| CN101913251A (en) * | 2010-07-27 | 2010-12-15 | 中北大学 | Liquid molding core-melting forming process for complicated resin-based composite material structural member |
| CN102423801A (en) * | 2011-11-28 | 2012-04-25 | 清华大学 | Method for mold filling water simulation of cast |
| CN102909356A (en) * | 2012-10-12 | 2013-02-06 | 清华大学 | Hydraulic simulation device capable of controlling ingot segregation and method |
| CN103009633A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Entity manufacturing method based on ultrathin layer wood-plastic composite material |
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