CN102423801A - Method for mold filling water simulation of cast - Google Patents
Method for mold filling water simulation of cast Download PDFInfo
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- CN102423801A CN102423801A CN2011103841255A CN201110384125A CN102423801A CN 102423801 A CN102423801 A CN 102423801A CN 2011103841255 A CN2011103841255 A CN 2011103841255A CN 201110384125 A CN201110384125 A CN 201110384125A CN 102423801 A CN102423801 A CN 102423801A
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- foundry goods
- cast
- sand mold
- synusia
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- 239000011901 water Substances 0.000 title claims abstract description 37
- 238000004088 simulation Methods 0.000 title claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 25
- 238000005266 casting Methods 0.000 claims abstract description 24
- 238000010147 laser engraving Methods 0.000 claims abstract description 7
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 6
- 238000000034 methods Methods 0.000 claims description 13
- 239000007787 solids Substances 0.000 claims description 13
- 229920005479 Lucite® Polymers 0.000 claims description 4
- 229920003023 plastics Polymers 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000003086 colorants Substances 0.000 claims description 2
- 238000005755 formation reactions Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group 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Abstract
The invention discloses a method for mold filling water simulation of a cast, which belongs to the technical field of casting. The method comprises the following steps: performing slicing layer by layer along a certain fixed direction through a three-dimensional CAD (computer aided design) software scaling sand mold model, generating a computer file, introducing the computer file into a laser engraving machine for machining, sequentially performing positioning, fixing, assembly and bonding on a layer sheet which is well machined to get a mold cavity model of the cast, further mounting a pouring system on the model and completing the manufacturing of the integral model. A casting mold cavity is manufactured by adopting the laser engraving or the machining method based on an acrylic sheet, the size precision of the casting mold cavity is high, the operation is simple, the cost is relatively low, the casting mold cavity is not limited by the complexity of the cast, and the manufacturing of the model in any shape can be realized.
Description
Technical field
The invention belongs to casting technology field, be specifically related to the method that a kind of foundry goods fills the simulation of type water.
Background technology
In casting, casting quality and liquid metal to fill type closely related, casting flaw such as pore, be mingled with, sand washing, misrun, cold shut etc. all with running gate system and liquid metal to fill the type flow behavior relevant.What prior art can't realize direct observation of liquid state metal well fills the type flow condition.The general filling time the earliest that adopts the electrode contacts method to measure the part in the cavity filling process owing to receive the restriction of collecting test point, is difficult to the whole stowing operation of direct reacting metal liquid more.At present to fill type computer simulation emulation technical application extensive for the liquid metal of foundry goods, but error and confidence level also are difficult to confirm.The type technology is filled in the simulation of original adoption water, promptly according to the theory of similarity and the correlation criterion of fluid simulation, in see-through model, carries out actual cast (generally adopting lucite), the flow process of observation of liquid state.But do not solve the problem that transparent complicated casting mold cavity is made, just simply piece together, be difficult to reflect the true form of casting mold cavity, therefore can not be applied to intricate casting with transparency glass plate.
Summary of the invention
The object of the present invention is to provide a kind of foundry goods to fill the method for type water simulation.
A kind of foundry goods fills the method for type water simulation, carries out according to following steps:
(1) according to counter its sand mold file of asking of foundry goods 3D solid file, dwindle according to 1: 1～1: 10 ratio, and on the sand mold file Design Orientation hole;
(2) according to making foundry goods local section principle constant or that variation is minimum that foundry goods is carried out piecemeal; Each piece successively dissects along the minimum direction of section variation the sand mold file according to 1/10～1/100 thickness of foundry goods minimum dimension; Generate the synusia file; Import to laser engraving machine, carve out sand mold die cavity profile and locating hole, the synusia file that processes is numbered;
(3) the synusia file is fixed, compresses, assembles, bondd, plug in alignment pin in the locating hole and position, obtain foundry goods die cavity model, isolated part is through be bonded in last synusia or back one synusia positions in advance in the synusia file;
(4) lucite tube and threeway, the four-way connection that adopt geometric ratio to dwindle connect the formation running gate system; The transparent plastic funnel that cup adopts geometric ratio to dwindle; Be installed in sprue top; Running gate system is connected with the casting mold cavity model, and sticks with glue knot position, seal junction, obtains the water simulation and uses complete model;
(5) adopt water tank and water pump to constitute water cast mechanism, middle priming valve control cast flow is equal to the actual casting pouring time duration of pouring, control cast flow speed;
(6) adopt high-speed camera and camera to observe the video recording of taking pictures, fill and add coloring agent and baton round in the type water so that tracking water mobile 1～8 angle.
Saidly according to the anti-process of its sand mold file of asking of foundry goods 3D solid file be: bottom, left side, right side, front side, rear side at the external cuboid profile of foundry goods 3D solid file respectively amplify 10～50mm; With this position and size configurations cuboid; Deduct foundry goods 3D solid file with this cuboid then, obtain the sand mold file of this foundry goods; Or foundry goods 3D solid file amplified the cast model that obtains amplifying in 1.1～1.3 ratio, the cast model that will amplify then deducts the sand mold file that foundry goods 3D solid file obtains hull shape.
Beneficial effect of the present invention: the present invention is based on acrylic board and adopt the method for laser engraving or machining to make casting mold cavity; The casting mold cavity dimensional accuracy is high; Simple to operate, cost is relatively low, and does not receive the restriction of foundry goods complexity; Can realize the modelling of arbitrary shape, in the casting water analogue test, special advantages arranged.
Description of drawings
Fig. 1 is the casting process sketch map;
Wherein, 1-rising head, 2-foundry goods.
Fig. 2 is the anti-sand mold file map of obtaining of foundry goods;
Wherein, 3-sand mold, 4-locating hole, 5-die cavity.
Fig. 3 is that the synusia profile diagram is dissectd in sand mold file A-A position;
Wherein, 3-sand mold, 4-locating hole, 5-die cavity.
Fig. 4 is the water analogue test system;
Wherein, 6-high-speed camera, 7-casting mold cavity model, 8-running gate system, 9-baton round, 10-dyeing water, 11-water valve, 12-water pump, 13-water tank.
Fig. 5 is the section in a certain cross section that goes out of foundry goods laser engraving.
Fig. 6 is each side of the hydraulic model of foundry goods;
Wherein, figure is the left side of model a); Figure b) be right flank; Figure c) be the result that the bottom is taken.
Fig. 7 is that the fill type liquid level of certain foundry goods when 30s shows the result.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
Adopt water analogue test system as shown in Figure 4, this system is made up of high-speed camera 6, casting mold cavity model 7, running gate system 8, baton round 9, dyeing water 10, water valve 11, water pump 12, water tank 13.
A kind of foundry goods fills the method for type water simulation, carries out according to following steps:
(1) foundry goods 2 (as shown in Figure 1) with rising head 1, this casting dimension is 6685mm*4840mm*2508mm, weight 75t.According to the three-dimensional process moulding file of this foundry goods, foundry goods 3D solid file is amplified the cast model that obtains amplifying in 1.1 times ratio, the cast model that will amplify then deducts the sand mold file that cast model obtains hull shape.This sand mold file comprises sand mold 3, locating hole 4 and die cavity 5 (Fig. 2-3), carries out scaled down with 1: 10, and on sand mold the Design Orientation hole.
(2) according to this foundry goods characteristic, its body directions X section variation is less, and its Y direction and Z direction section variation are big, so this foundry goods piecemeal not, and sand mold is piecemeal not also.1/10 (2mm) according to minimum dimension carries out step section along directions X, generates the synusia file.The synusia file is imported laser engraving machine process, label is carried out in each section (as shown in Figure 5) that processes in order.
(3) synusia is fixed in order, compresses, assembles, bondd, insert screw rod in the locating hole and position, obtain foundry goods die cavity model.
(4) lucite tube and threeway, the four-way connection etc. that adopt
connect and compose running gate system; Cup adopts transparent plastic funnel; Be installed in sprue top; Running gate system is connected with the casting mold cavity model; And stick with glue knot position, seal junction, and obtain the water simulation and use complete model, as shown in Figure 6.
(5) the pattern plan is filled in the water cast, and it is 4L/s that injection flow speed is watered in control valve control.
(6) adopt high-speed camera and camera to observe the video recording of taking pictures, fill and add baton round in the type water so that follow the tracks of flowing of water 3 angles.
The effect that this instance is implemented:
Fig. 7 is the hydraulic analogy cavity filling process of this foundry goods of high-speed camera shooting, and filling time is 61s.The black plastic bead is the trace particle in the cavity filling process among the figure, demonstrates the uphill process of liquid level.As can be seen from the figure, in the casting process, both sides liquid level integral body is steady rising, and difference in height appears in the part, because sprue is distributed in foundry goods one end, process corrections can move cast gate to the foundry goods middle part.
Claims (2)
1. a foundry goods fills the method that type water is simulated, and it is characterized in that, carries out according to following steps:
(1) according to counter its sand mold file of asking of foundry goods 3D solid file, dwindle according to 1: 1～1: 10 ratio, and on the sand mold file Design Orientation hole;
(2) according to making foundry goods local section principle constant or that variation is minimum that foundry goods is carried out piecemeal; Each piece successively dissects along the minimum direction of section variation the sand mold file according to 1/10～1/100 thickness of foundry goods minimum dimension; Generate the synusia file; Import to laser engraving machine, carve out sand mold die cavity profile and locating hole, the synusia file that processes is numbered;
(3) the synusia file is fixed, compresses, assembles, bondd, plug in alignment pin in the locating hole and position, obtain foundry goods die cavity model, isolated part is through be bonded in last synusia or back one synusia positions in advance in the synusia file;
(4) lucite tube and threeway, the four-way connection that adopt geometric ratio to dwindle connect the formation running gate system; The transparent plastic funnel that cup adopts geometric ratio to dwindle; Be installed in sprue top; Running gate system is connected with the casting mold cavity model, and sticks with glue knot position, seal junction, obtains the water simulation and uses complete model;
(5) adopt water tank and water pump to constitute water cast mechanism, middle priming valve control cast flow is equal to the actual casting pouring time duration of pouring, control cast flow speed;
(6) adopt high-speed camera and camera to observe the video recording of taking pictures, fill and add coloring agent and baton round in the type water so that tracking water mobile 1～8 angle.
2. fill the method for type water simulation according to the said a kind of foundry goods of claim 1; It is characterized in that; Saidly according to the anti-process of its sand mold file of asking of foundry goods 3D solid file be: bottom, left side, right side, front side, rear side at the external cuboid profile of foundry goods 3D solid file respectively amplify 10～50mm; With this position and size configurations cuboid, deduct foundry goods 3D solid file with this cuboid then, obtain the sand mold file of this foundry goods; Or foundry goods 3D solid file amplified the cast model that obtains amplifying in 1.1～1.3 ratio, the cast model that will amplify then deducts the sand mold file that foundry goods 3D solid file obtains hull shape.
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