CN103212687A - Casting device and casting method for wheel disc workpieces - Google Patents
Casting device and casting method for wheel disc workpieces Download PDFInfo
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- CN103212687A CN103212687A CN2012100179296A CN201210017929A CN103212687A CN 103212687 A CN103212687 A CN 103212687A CN 2012100179296 A CN2012100179296 A CN 2012100179296A CN 201210017929 A CN201210017929 A CN 201210017929A CN 103212687 A CN103212687 A CN 103212687A
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Abstract
The invention relates to a casting device and a casting method for wheel disc workpieces. The casting device comprises a pouring system, the pouring system is provided with a die cavity, semicircular double-runners, and a plurality of inner gates, the semicircular double-runners are arranged at the wheel rim edge of the die cavity, and the inner gates are respectively arranged in the die cavity and positioned at the wheel rim edge of all spoke positions and the positions among the runners. The casting device further comprises a vacuum-pumping system and a pressure compensating system. The casting method comprises the steps of injecting alloy melt into a pressure chamber, moving the sealed die cavity and the runners through an injection punch, starting the vacuum-pumping system, fast vacuumizing by adopting a large-aperture vacuum channel, then continuing moving the injection punch forwards at low injection speed, enabling the alloy melt to perform mold filling to the wheel rim position, the spoke position and the wheel core position in the die cavity in the double-runners at slow mold filling speed through all the inner gates in sequence, closing the vacuum channel when the mold filling is near completion, performing pressure compensation to the alloy melt with larger wall thickness through a pressure compensating lever while keeping the high pressure of the injection punch after the mold filling is completed, and finally solidifying the alloy melt under the pressure to obtain a sound casting.
Description
Technical field
The present invention relates to casting device and method, particularly a kind of casting device and casting method thereof that is used to take turns disc type work.
Background technology
Easily bitter earth alloy is widely used in high-pressure casting production.Traditional high-pressure casting has only an injection plunger, thereby can only be realized by the first place of injection to pressurization and pressurize in the whole process of solidifying by mold filling.Because like this, the high-pressure casting of magnesium alloy can't be produced the foundry goods that needs the many places feeding based on thin-walled parts.So just show the mechanical mechanics property that has reduced the bigger product of wall thickness difference, limiting the Application of Magnesium scope.In the casting process of whole magnesium alloy, solidify and must under protective atmosphere or vacuum condition, finish from being melted to avoid oxidation, existing casting method great majority are not suitable for the casting of magnesium alloy.At present relevant metal pattern gravitational casting magnesium alloy patented technology majority has shortcomings such as equipment complexity, operating difficulties, to such an extent as to use limited (such as Australian T-Mg technology).A kind of vacuum high-pressure casting technology that is applicable to the wheel disc series products is also arranged.But there is distinct disadvantage in it: the long build-up of pressure loss of abscission ring shape cross gate is serious, the position insufficient fill that causes spoke and wheel rim equal strength to be had relatively high expectations, and ftercompction plunger wear is serious, and the vacuum seal effect is undesirable, thereby yield rate is low.
High-pressure casting itself has an obvious defects, is exactly a large amount of gas and oxide inclusions of the too fast generation of filling mold speed, thereby the high-pressure casting product can not enhance product performance through Overheating Treatment, and product is mainly used in ornamental and the not high application of intensity.Evacuated die-casting process is a kind ofly to reduce the method that oxide and gas are mingled with, and obtains obvious effects in the die casting field of smallclothes product.Up to now, evacuated die-casting process faces a technical barrier that is difficult to overcome, the bigbore vacuum passage that can't use that causes owing to the blockage problem of vacuum passage is got rid of air in the large volume die cavity fast exactly, and under the situation of not stopping up vacuum passage sealing vacuum passage fast.At present, there is a kind of plunger of outside force control that adopts to realize that the switching of vacuum passage also provides the method for feeding pressure simultaneously for foundry goods.Yet this method plunger wear problem is serious, and sealing effectiveness is undesirable.
In view of exist in the prior art owing to gas is mingled with and the undesirable low defective of alloy-steel casting performance that causes of oxide inclusions, people need a kind of improved casting device and method and are mingled with Mg alloy castings with the low densification of oxide inclusions so that obtain gas.
Summary of the invention
The object of the present invention is to provide a kind of casting device and casting method thereof that is used to take turns disc type work, it can obtain gas and be mingled with Mg alloy castings with the few densification of oxide inclusions.
According to a first aspect of the invention, provide a kind of casting device that is used to take turns disc type work, comprising: running gate system, wherein have die cavity, have wheel rim position, spoke position and core wheel position in the die cavity; Be arranged on the dual channel of the periphery at wheel rim position in the die cavity, each runner has semi-circular structure and has the inlet that is used to inject melt; Be used to hold the pressure chamber of melt, it has the sprue gate, presses the chamber to be communicated with the inlet of dual channel; Be arranged on and press the indoor injection punch head that moves back and forth; And a plurality of ingates, it is separately positioned in the die cavity in wheel rim position between each spoke position and the position between the runner, is communicated with dual channel; Pumped vacuum systems, its have the core wheel position that is arranged on the last filling of die cavity wide-aperture vacuum passage, be arranged on the vavuum pump of the vacuum passage other end and be arranged on vacuum valve in the vacuum passage; And the ftercompction system, it has the ftercompction bar, is arranged on the core wheel position of die cavity and the opening part of vacuum passage, and moving forward of ftercompction bar is used for the melt of die cavity filling is carried out ftercompction, and vacuum passage closed, auxiliary sealing vacuum passage.
In above-mentioned casting device, pumped vacuum systems also have be arranged on the vacuum tank between vavuum pump and the vacuum valve and be arranged on vacuum passage and vacuum valve between filter.
In above-mentioned casting device, the interlock of vacuum valve and injection punch head, injection punch head sealing die cavity and runner move forward the interlock of opening with vacuum valve.
In above-mentioned casting device, the interlock of vacuum valve and ftercompction bar, the ftercompction bar move forward the interlock of closing with vacuum valve.
In above-mentioned casting device, also be provided with the pressurized cylinder that is used to drive the ftercompction bar.
In above-mentioned casting device, the position that wall thickness is bigger in die cavity also is provided with split type ftercompction bar.
According to a second aspect of the invention, provide a kind of casting method of implementing above-mentioned casting device, comprising: it is indoor that melt is injected pressure by the sprue gate; Injection punch head pressing indoor moving forward with after sealing die cavity and runner, is opened vacuum valve, die cavity is vacuumized; Injection punch head is continued to move forward with low pressure firing rate degree, make melt in dual channel, also pass through each ingate the wheel rim position in die cavity, spoke position and core wheel position mold filling successively with little filling mold speed, at first fill the wheel rim position, and be intersected in spoke position end, fill the spoke position afterwards gradually, and converge at the core wheel position at last; When being near completion, mold filling closes vacuum passage; And after mold filling is finished, carry out the pressure feeding and melt is solidified under pressure by ftercompction pole pair melt when making injection punch head keep high pressure.
In above-mentioned casting method, behind injection punch head sealing die cavity and runner, injection punch head do not stop or the situation of minibreak under, utilize bigbore vacuum passage, make die cavity reach the vacuum of setting in the short time.
In above-mentioned casting method, when adopting little filling mold speed mold filling, make alloy melt stream tangent plane basic consistent with the runner tangent plane, make the pattern of the forward position of alloy melt with the plane mold filling, under less turbulent-flow conditions, finish mold filling, and make and be mingled with the top that is pushed into the core wheel position by the alloy melt forward position.
In above-mentioned casting method, the closing of vacuum passage when mold filling is near completion is by closing vacuum valve and realizing by the opening that makes the ftercompction bar move forward the sealing vacuum passage, to avoid the obstruction of vacuum passage.
In above-mentioned casting method, further ftercompction is carried out at the position that wall thickness is bigger in die cavity respectively.
Adopt casting device of the present invention and method, have following beneficial effect:
(1) adopts two semi-circular runners and a plurality of ingate, reached wheel rim the segmentation mold filling so that the magnesium alloy fused mass forward position assemble in an end of spoke, converge at core wheel by spoke afterwards, avoided cross dead point and the defective that causes thus and performance of the melt on the wheel rim to reduce;
(2) utilize the vacuum aided mold filling, air drag and oxidation when reducing the magnesium alloy fused mass casting;
(3) adopt less filling mold speed to reduce the turbulent flow that melt produces in mold filling process, reduce the possibility that gas and oxide inclusions produce;
(4) obtain fine and close Mg alloy castings by pressure feeding to the wall thickness position.
Description of drawings
Come exemplarily to illustrate vacuum aided of the present invention, low speed, high-pressure casting device and implementation method thereof with reference to the accompanying drawings, wherein:
Figure 1A-Fig. 1 C is respectively front view, rearview and the perspective view of the product example that the present invention cast;
Fig. 2 is the cross-sectional schematic of vacuum aided of the present invention, low speed, high-pressure casting device;
Fig. 3 illustrates the two half round runner of running gate system in the casting device of the present invention and the configuration structure of die cavity;
Fig. 4 A-Fig. 4 I illustrates the mold filling precedence diagram of vacuum aided of the present invention, low speed, high-pressure casting method; And
Fig. 5 A-Fig. 5 I illustrates the precedence diagram that solidifies of vacuum aided of the present invention, low speed, high-pressure casting method.
The specific embodiment
The present invention relates to a kind of vacuum aided, low speed, high-pressure casting apparatus and method that are used to take turns disc type work.Below in conjunction with diagram, by only being casting device and the method that mode is for example described magnesium alloy hub workpiece of the present invention.Should be appreciated that the present invention is not limited, also other takes turns disc type work applicable to the gear of aluminium alloy or other metal, belt pulley etc. in the present invention.
Shown in Figure 1A-Fig. 1 C, wheel hub 1 comprises wheel rim 2, spoke 3 and core wheel 4, and wherein the wall thickness of spoke 3 is little, and is bigger with the wall thickness difference of wheel rim 2 and core wheel 4.
Fig. 2 illustrates the basic structure of casting device 8 of the present invention, and Fig. 3 illustrates the dual channel 11 of running gate system 10 in the casting device 8 of the present invention and the arrangement of die cavity 12.Wherein, die cavity 12 comprises wheel rim position 13, a plurality of spokes position 14 and core wheel position 15.Dual channel 11 is arranged on the periphery at the wheel rim position 13 in the die cavity 12, and each runner has semi-circular structure.Be provided with the pressure chamber 17 that is used to hold alloy melt 16, it has sprue gate 18, presses chamber 17 to be communicated with the inlet 20 of dual channel 11.In pressing chamber 17, be provided with injection punch head 22, can move back and forth therein.Be provided with a plurality of ingates 24, it is separately positioned in the die cavity 12 in wheel rim position 13 between each spoke position 14 and the position between the runner 11, is communicated with runner 11.Casting device 8 also comprises pumped vacuum systems 26, its have the core wheel position 15 that is arranged on die cavity 12 last fillings wide-aperture vacuum passage 27, be arranged on the vavuum pump 28 of vacuum passage 27 other ends and be arranged on vacuum valve 29 in the vacuum passage 27.Casting device 8 also comprises ftercompction system 30, wherein has ftercompction bar 31, and it is arranged on the core wheel position 15 of die cavity 12 last fillings and opening 32 places of vacuum passage 27, also is provided with pressurized cylinder 33, is used for fast driving ftercompction bar 31.Ftercompction bar 31 is used for the alloy melt 16 of die cavity 12 fillings is carried out ftercompction, and vacuum passage 27 is closed when moving forward, and plays auxiliary sealing vacuum passage 27.Pumped vacuum systems 26 can have the vacuum tank 36 that is arranged between vavuum pump 28 and the vacuum valve 29, so that the utmost point after vacuum valve 29 is opened makes the vacuum of whole die cavity 12 be reduced to the vacuum values that sets in the short time.Position before vacuum passage 27 connects vacuum valve 29 is provided with filter 37, prevents that impurity from entering in vacuum valve 29 and the vavuum pump 28.Different with traditional evacuated die-casting process is, the present invention utilizes large aperture vacuum passage 27, control the switching of vacuum passage 27 by the vacuum valve 29 that is synchronized with the movement with ftercompction bar 31, when ftercompction bar 31 moved forward and vacuum passage 27 closed, vacuum valve 29 cut out.The vacuum valve 29 that is synchronized with the movement with ftercompction bar 31 has guaranteed the uniformity of the motion of whole casting device 8, avoids the incoordination of independently moving and operation problem that the vacuum passage 27 that brings thus stops up.Long with regard to the reaction time that has overcome traditional small-bore vacuum passage like this, vacuum effectiveness is bad and problem such as vacuum passage obstruction.
In casting device 8 of the present invention, vacuum valve 29 and injection punch head 22 interlocks are crossed sprue gate 18 and when sealing die cavity 12 and runner 11, vacuum valve 29 is opened, and begins die cavity 12 is vacuumized when injection punch head 22 moves forward.
Below in conjunction with Fig. 2 and casting device 8 and running gate system 10 shown in Figure 3, as a kind of example, further specify vacuum aided, low speed, the high-pressure casting method that is used for magnesium alloy wheel disc type work of the present invention with wheel hub 1.
When casting, at first, alloy melt 16 is injected in the pressure chamber 17 by sprue gate 18; Secondly, injection punch head 22 is moved forward with behind sealing die cavity 12 and the runner 11 in pressing chamber 17, open vacuum valve 29, die cavity 12 is vacuumized; Then, injection punch head 22 is continued to move forward with low pressure firing rate degree, make alloy melt 16 in dual channel 11, also pass through each ingate 24 the wheel rim position 13 in die cavity 12, spoke position 14 and core wheel position 15 mold fillings successively with little filling mold speed, fill wheel rim 2 earlier, and be intersected in spoke 3 ends, fill spoke 3 afterwards gradually, and converge at core wheel 4 at last; When mold filling be near completion close vacuum passage 27 thereafter; After mold filling is finished, carry out the pressure feeding by 31 pairs of alloy melts of ftercompction bar 16 when making injection punch head 22 keep high pressure then; At last, carrying out the demoulding after alloy melt 16 in the die cavity 12 is solidified under pressure handles.
When casting according to casting method of the present invention, behind injection punch head 22 sealing die cavitys 12 and runner 11, injection punch head 22 do not stop or the situation of minibreak under, the setting that utilizes bigbore vacuum passage 27 and utilize vacuum tank can make die cavity 12 reach the vacuum of setting at short notice.The switching of vacuum system 26 is to control with the switching of vacuum valve 29.The switching of vacuum valve 29 then is by the determining positions of injection punch head 22.
When casting according to casting method of the present invention, must adopt little filling mold speed mold filling, make alloy melt stream tangent plane basic consistent with the runner tangent plane, make the pattern of the forward position of magnesium alloy fused mass with the plane mold filling, finish mold filling under less turbulent-flow conditions, and make and be mingled with the top that is pushed into core wheel position 14 by the alloy melt forward position, cinder ladle is played at this position, under 31 effects of ftercompction bar, produce the effect of having shunk the casting rising head simultaneously, and cut in the process of following process.
Fig. 4 A-Fig. 4 I illustrates the mold filling precedence diagram of vacuum aided of the present invention, low speed, high-pressure casting method, therefrom can see, and in the different moment, the forward position of alloy melt 16 arrives the situation of the different parts of die cavity 12.The speed of low speed mold filling should not be too fast and cause big turbulent flow and upset the mold filling order, then causes casting flaws such as cold shut too slowly easily.
When casting according to casting method of the present invention, when mold filling is near completion, close vacuum passage 27, it is by closing vacuum valve 29 and realizing by the opening that makes ftercompction bar 31 move forward sealing vacuum passage 27, to avoid the obstruction of vacuum passage.Ftercompction bar 31 is by after vacuum passage 27 inlets, and the mold filling process that temporarily stops to move ahead up to by injection punch head 22 controls finishes, and continuing moves ahead under the effect of pressurized cylinder (oil cylinder or cylinder) 33 carries out feeding to the foundry goods in the process of setting.Fig. 5 A-Fig. 5 I illustrates the precedence diagram that solidifies of vacuum aided of the present invention, low speed, high-pressure casting method, therefrom can see, and in the different moment, alloy melt 16 is in the situation of solidifying of the different parts of die cavity 12.Position that can wall thickness is bigger in die cavity is provided with split type ftercompction bar, in process of setting the pressure feeding is carried out at the bigger position of the wall thickness of foundry goods.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (11)
1. casting device that is used to take turns disc type work comprises:
Running gate system wherein has
Die cavity has wheel rim position, spoke position and core wheel position in the die cavity;
Be arranged on the dual channel of the periphery at wheel rim position in the die cavity, each runner has semi-circular structure and has the inlet that is used to inject melt;
Be used to hold the pressure chamber of melt, it is communicated with the inlet of dual channel and has a sprue gate;
Be arranged on and press the indoor injection punch head that moves back and forth; And
A plurality of ingates, it is separately positioned in the die cavity in wheel rim position between each spoke position and the position between the runner, is communicated with dual channel;
Pumped vacuum systems, its have the core wheel position that is arranged on the last filling of die cavity wide-aperture vacuum passage, be arranged on the vavuum pump of the vacuum passage other end and be arranged on vacuum valve in the vacuum passage; And
The ftercompction system, it has the ftercompction bar, is arranged on the core wheel position of die cavity and the opening part of vacuum passage, and moving forward of ftercompction bar is used for the melt of die cavity filling is carried out ftercompction, and vacuum passage closed, auxiliary sealing vacuum passage.
2. according to the casting device of claim 1, it is characterized in that, pumped vacuum systems also have be arranged on the vacuum tank between vavuum pump and the vacuum valve and be arranged on vacuum passage and vacuum valve between filter.
3. according to the casting device of claim 1, it is characterized in that, vacuum valve and injection punch head interlock, injection punch head seals moving forward of die cavity and runner, with the interlock of opening of vacuum valve.
4. according to the casting device of claim 1, it is characterized in that, the interlock of vacuum valve and ftercompction bar, the ftercompction bar move forward the interlock of closing with vacuum valve.
5. according to the casting device of claim 1, it is characterized in that, also be provided with the pressurized cylinder that is used to drive the ftercompction bar.
6. according to the casting device of claim 1, it is characterized in that the position that wall thickness is bigger in die cavity also is provided with split type ftercompction bar.
7. casting method of implementing claim 1 casting device, comprising:
It is indoor that melt is injected pressure by the sprue gate;
Injection punch head pressing indoor moving forward with after sealing die cavity and runner, is opened vavuum pump and vacuum valve, die cavity is vacuumized;
Injection punch head is continued to move forward with low pressure firing rate degree, make melt in dual channel, also pass through each ingate the wheel rim position in die cavity, spoke position and core wheel position mold filling successively with little filling mold speed, at first fill the wheel rim position, and be intersected in spoke position end, fill the spoke position afterwards gradually, and converge at the core wheel position at last;
When being near completion, mold filling closes vacuum passage; And
After mold filling is finished, carry out the pressure feeding and melt is solidified under pressure by ftercompction pole pair melt when making injection punch head keep high pressure.
8. according to the casting method of claim 7, wherein, behind injection punch head sealing die cavity and runner, injection punch head do not stop or the situation of minibreak under, utilize bigbore vacuum passage, make die cavity reach the vacuum of setting in the short time.
9. according to the casting method of claim 7, wherein, when adopting little filling mold speed mold filling, make alloy melt stream tangent plane basic consistent with the runner tangent plane, make the pattern of the forward position of alloy melt with the plane mold filling, under less turbulent-flow conditions, finish mold filling, and make and be mingled with the top that is pushed into the core wheel position by the alloy melt forward position.
10. according to the casting method of claim 7, wherein, the closing of vacuum passage when mold filling is near completion is by closing vacuum valve and realizing by the opening that makes the ftercompction bar move forward the sealing vacuum passage, to avoid the obstruction of vacuum passage.
11. according to the casting method of claim 7, wherein, further ftercompction is carried out at the position that wall thickness is bigger in die cavity respectively.
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| CN2012100179296A CN103212687A (en) | 2012-01-19 | 2012-01-19 | Casting device and casting method for wheel disc workpieces |
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| CN2012100179296A CN103212687A (en) | 2012-01-19 | 2012-01-19 | Casting device and casting method for wheel disc workpieces |
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| CN103658593A (en) * | 2013-12-06 | 2014-03-26 | 宁波旭升机械有限公司 | Vacuum secondary extrusion die and die casting method |
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Application publication date: 20130724 |