CN203751307U - Die-casting die capable of preventing shrinkage cavity of casting - Google Patents
Die-casting die capable of preventing shrinkage cavity of casting Download PDFInfo
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- CN203751307U CN203751307U CN201420106846.9U CN201420106846U CN203751307U CN 203751307 U CN203751307 U CN 203751307U CN 201420106846 U CN201420106846 U CN 201420106846U CN 203751307 U CN203751307 U CN 203751307U
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- die
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Abstract
The utility model discloses a die-casting die capable of preventing a shrinkage cavity of a casting. The die-casting die comprises a movable die and a fixed die, and the movable die and the fixed die form a die cavity in the die assembly process. A pouring opening, a pouring channel and a pouring opening cover are formed in the fixed die, and the pouring channel and the die cavity are communicated with each other through the pouring opening. High-temperature liquid metal is pressed and injected into the pouring channel from the pouring opening cover under the pressure effect of a pressing chamber, and then the high-temperature liquid metal enters the die cavity through the pouring channel to be condensed to be formed. For a common die-casting die, due to the fact that the liquid metal is quickly solidified in the pouring channel, the pressure transmitted from the pressing chamber can not be maintained to the last, the last solidified part of the casting, namely a thermal center, can be loosened frequently, if machining is conducted on the thermal center, a loose organization inside can be exposed out, and the pressing resistance demand of the casting can not be met easily. According to the die-casting die capable of preventing the shrinkage cavity of the casting, a local pressurization mechanism is arranged on the die, a hydraulic cylinder is used for driving a compaction pin to break through a metal surface layer, the semisolid metal in the thermal center is pressurized by high pressure, subsequent solidification is achieved under continuous high pressure, and therefore a high-quality die-casting workpiece is obtained.
Description
Technical field
The utility model relates to a kind of die casting, especially relates to a kind of die casting that can prevent foundry goods shrinkage cavity.
Background technology
Die casting is a kind of method of casting liquid forging, a kind of technique completing on special-purpose die casting die forging machine.Its basic craft course is: the first low speed of molten metal or high-speed casting fill in the die cavity of type progressive die tool, mould has movable cavity surface, it,, along with the cooling procedure pressurization of molten metal is forged, had both eliminated the shrinkage porosity defect of contraction cavity of blank, also made the interior tissue of blank reach the Broken Crystal of forging state.The comprehensive mechanical performance of blank is significantly improved.
Die casting is exactly a kind of mould that is specifically designed to die casting.It is comprised of fixed half and moving half conventionally, and cover half is fixed on compression chamber of die casting machine one side's top clamping plate, is the part that molten metal starts to enter compression mod die cavity, is also one of place part of compression mod die cavity.On cover half, there is sprue to be directly connected with nozzle or the pressure chamber of die casting machine.Dynamic model is fixed on the Bottom clamp plate of die casting machine, with Bottom clamp plate, to left and right mobile, separate and closes up with cover half, generally looses core and establishes within it with foundry goods ejecting mechanism.
In the prior art, as recorded a kind of basic structure of die casting in the patent No. PCT Patent Prospectus that is 201280022838.X, this die casting is cast die-cast product by being pressed into motlten metal to die cavity.The die casting of this invention has: cover half; Dynamic model, it can be approaching and separated with respect to cover half, and the composition surface between them forms die cavity together with cover half; Overflow launder, it is formed at least one in fixed half and moving half in the mode being connected with die cavity by overflow cast gate; The gas permeable member of porous, it is located at least one in fixed half and moving half in the mode being connected with overflow launder, and this gas permeable member can not make motlten metal in overflow launder by making gas permeation; And exhaust channel, its one end is connected with the surface of a side contrary to overflow launder of gas permeable member, and its other end is connected with the outside of cover half or the outside of dynamic model.
But, in actual process, because the running channel on cover half is longer, the cooled and solidified speed of the liquid metal of high temperature is very fast, while flowing in running channel, the temperature of liquid metal obviously reduces, make pressure that pressure chamber passes over cannot be maintained to the end of a period of solidifying of foundry goods, outside due to liquid metal comes in contact with die surface in addition, this just makes the outside cooling velocity will be faster than inside, the position of foundry goods final set is that thermal center place is often in inside, at the thermal center place of foundry goods, often there is loose appearance, will be at this position machining hole or groove if predetermined, tend to cause the generation of shrinkage cavity phenomenon, in addition, if carry out herein machining, inner open texture will come out, its density is difficult to meet the requirement of withstand voltage of foundry goods.
Utility model content
Technical problem to be solved in the utility model is for the above-mentioned state of the art, to provide a kind of and can improve foundry goods interior solid degree, prevent foundry goods shrinkage cavity, meet the die casting of foundry goods requirement of withstand voltage.
The utility model is to solve the problems of the technologies described above adopted technical scheme to be:
A kind of die casting that can prevent foundry goods shrinkage cavity, include dynamic model and cover half, described dynamic model can or close up with respect to described cover half separation, when described dynamic model and described cover half close up, on the composition surface of described dynamic model and described cover half, be formed with die cavity, on described cover half, be provided with cast gate, sprue bush and running channel, described cast gate is opened on described die cavity, described running channel is communicated with described die cavity by described cast gate, described sprue bush is opened in described cover half surface and is communicated with described running channel, this die casting also includes partial Pressure mechanism, described partial Pressure mechanism includes the compacting pin may extend in described die cavity.
Adopt the die casting of this structure, that Yi Ge partial Pressure mechanism is set on mould, this partial Pressure mechanism includes compacting pin, compacting pin by driving mechanism as drivings such as liquid cylinders, can stretch into rapidly the inside of die cavity, the semi-solid-state metal solidifying is impacted, the size of this compacting pin be manufactured into foundry goods on the size in groove to be processed or hole suitable, when compacting pin quick washing semi-solid-state metal, can so that semi-solid-state metal in the impact lower recess (punching technology in the similar punching press of this process) of compacting pin, thereby can on foundry goods, be formed with groove or hole.Because the volume of die cavity is limited, when compacting pin enters into die cavity when semi-solid-state metal surface impacts goes out a groove, the metal of original groove location has been extruded to the position (being the border of groove) on compacting pin side, thereby has improved density, has also avoided the generation of shrinkage cavity phenomenon.
As of the present utility model preferably, described partial Pressure mechanism is arranged in any one among both of described dynamic model or described cover half.
As improvement of the present utility model, on described dynamic model and described cover half, be provided with partial Pressure mechanism.
Adopt the die casting of said structure, at dynamic model or cover half, partial Pressure mechanism being set or partial Pressure mechanism is all set on both on one of them is the needs that fully taken into account shape and the processing technology of various converted products, if it is unidirectional that the groove on this product or hole are all arranged on, that just only need to be in dynamic model or cover half one of them on partial Pressure mechanism is set, generally preferably Jiang Gai partial Pressure mechanism is arranged on dynamic model, this is owing to can offering running channel on cover half, the multiple parts such as condensate pipe, likely can cause interfering between partial Pressure mechanism and these parts, if this product needed two sides machined grooves or hole, that just needs on fixed half and moving half, to arrange partial Pressure mechanism simultaneously.
As further improvement of the utility model, on described dynamic model, offer through hole, described compacting pin is located in described through hole slidably, when described cover half is separated with described dynamic model, or when described cover half and described dynamic model have just closed up, the end of described compacting pin is concordant with described die cavity and can be by described die cavity sealing.
Adopt the die casting of this structure, that the shape and size designing of the end of compacting pin is become to suitable with the size of through hole, can block this through hole, and at this compacting pin during in original state, the end of this compacting pin is concordant with the surface of die cavity, prevents after liquid metal enters die cavity, enters into the gap between compacting pin and through hole, form some very narrow chimbs, affect the surface smoothness of shaped casting.
Preferably described partial Pressure mechanism includes hydraulic cylinder as of the present utility model, and described hydraulic cylinder is fixed on described dynamic model, on described hydraulic cylinder, is provided with piston rod, described piston rod be located in described through hole and with described compacting pin interlock.
Adopt the die casting of this structure, it is the driving mechanism using hydraulic cylinder as compacting pin, this hydraulic cylinder is commercial common hydraulic cylinder, specification is 8T, the i.e. maximum motive force that can provide 8 tons, so this hydraulic cylinder can provide the metal in enough drive force compacting pin quick washing die cavity.Because the piston rod of hydraulic cylinder is the standard component supporting with hydraulic cylinder, on its specification and foundry goods, the size in groove to be processed or hole cannot be adaptive, is therefore directly piston rod to be used as compacting pin.
As of the present utility model, further preferably in described through hole, be provided with connecting rod, described connecting rod one end and described piston rod are fixed, and the other end is threaded connection with described compacting pin and fixes.
Because piston rod is different from the size between compacting pin, in order to realize better interlock, in through hole, be provided with a connecting rod, this connecting rod one end is processed to the end of piston rod adaptive, be threaded connection or other dismountable fixed forms are fixed on piston rod, the other end is processed to the size of compacting pin suitable, and the mode being threaded connection and compacting pin are fixed.Here, in order to facilitate compacting pin to slide in through hole, compacting pin is to consist of different end, footpath, cross section and pin body, the footpath, cross section of pin body will be slightly less than the radius of through hole, pin body can be slided in through hole, sell in addition body and be connected with connecting rod, when processing connecting rod, also likely make the footpath, cross section of connecting rod be less than the radius of through hole like this, thereby connecting rod can be slided in through hole.
Compared with prior art, the utility model has the advantage of: be that Yi Ge partial Pressure mechanism is set on mould, by Driven by Hydraulic Cylinder compacting pin, the metal in die cavity carries out punching press when semi-solid state in this partial Pressure mechanism, and after punching press persistent pressure, thereby the high quality casting that can be shaped and to have high-compactness, shrinkage cavity phenomenon can not occur.
Accompanying drawing explanation
Fig. 1 can prevent the structural representation of the die casting of foundry goods shrinkage cavity in the utility model embodiment;
Fig. 2 is for being used die casting in Fig. 1 embodiment to carry out the structural representation of foundry goods after die cast.
Reference numeral:
1, dynamic model; 2, cover half; 2.1, cast gate; 2.2, sprue bush; 2.3, running channel; 3, die cavity; 4, partial Pressure mechanism; 4.1, compacting pin; 4.2, hydraulic cylinder; 4.2.1, piston rod; 5, connecting rod; 6, foundry goods; 6.1, groove.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
As Figure 1-Figure 2, the present embodiment is a kind of die casting that can prevent foundry goods 6 shrinkage cavities, include dynamic model 1 and cover half 2, described dynamic model 1 is can be under the effect of extraneous clamping pressure machine (not shown) separated or close up with respect to described cover half, this clamping pressure machine is commercial common clamping pressure machine, as long as its specification meets, dynamic model can be locked on cover half.
When described dynamic model 1 and described cover half 2 close up while being matched moulds, on the composition surface of described dynamic model 1 and described cover half 2, be formed with die cavity 3, on described cover half, be provided with cast gate 2.1, sprue bush 2.2 and running channel 2.3, described cast gate 2.1 is opened on described die cavity, described running channel 2.3 is communicated with described die cavity 3 by described cast gate 2.1, described sprue bush 2.2 is opened in described cover half surface and is communicated with described running channel, this die casting also includes partial Pressure mechanism 4, the driving mechanism that described partial Pressure mechanism includes the compacting pin 4.1 may extend in described die cavity and drives this compacting pin motion, this driving mechanism can be motor, hydraulic cylinder or cylinder etc., concrete depending on the required motive force of compacting pin, in the present embodiment, the motive force required due to compacting pin 4.1 is larger, therefore general cylinder cannot provide enough large motive force, if and adopt some powerful servomotors, high cost, so preferably adopt a hydraulic cylinder 4.2 as driving mechanism in this enforcement, this hydraulic cylinder 4.2 is a commercial common hydraulic cylinder, the specification of this hydraulic cylinder is 8T, the i.e. maximum motive force promotion compacting pin motion that can provide 8 tons.
On described dynamic model 1, offer through hole 1.1, described compacting pin 4.1 is located in described through hole, these compacting pin 4.1 one end are connected on hydraulic cylinder 4.2, thereby make the compacting pin 4.1 can be in the interior slip of through hole 1.1 under the driving of this hydraulic cylinder 4.2, the end of the other end of this compacting pin is at described cover half and described dynamic model during in released state, or when state in just having closed up of described cover half and described dynamic model, the end of described compacting pin 4.1 is concordant with described die cavity and can be by described die cavity sealing.This is between the end of compacting pin 4.1 and die cavity 3 planes, to have formed step surface in order to prevent, cause foundry goods 6 surfaces after solidifying also to form consistent with this step surface shape step-like raised or sunken, this step-like raised or sunken be not within the scope of the processing request of former foundry goods 6, therefore need to be after foundry goods 6 be taken out, it is carried out to surface treatment procedure, increased after surface treatment procedure, both wasted the time, also affected the flatness on foundry goods 6 surfaces simultaneously.
When the high-temperature metal of die cavity is during in semi-solid state, by hydraulic cylinder 4.2, drive compacting pin 4.1 to semi-solid-state metal punching press, speed due to compacting pin, the duricrust that can break through metal surface enters into the inside of metal, thereby can stamp out in metal surface a groove 6.1, meanwhile, the metal of original groove 6.1 parts be extruded to groove 6.1 near, improved the density of groove 6.1 borders.
Because the size of piston 4.2.1 and the size of compacting pin of hydraulic cylinder can not be adaptive, for convenient interlock between the two, between the piston rod 4.2.1 of hydraulic cylinder and compacting pin, be also provided with a connecting rod 5, the modes such as this connecting rod one end is threaded connection, pin joint and piston rod are removably fixing, and the modes such as the other end is threaded connection, pin joint and compacting pin are removably fixing.
Introduce in detail below lower extrusion process when using above-mentioned die casting liquid towards metal to carry out die cast as aluminium, the step of this extrusion process is as follows:
1) use clamping pressure machine that cover half 2 and dynamic model 1 are closed up, make to form a die cavity 3 being shaped for foundry goods 6 in described die casting;
2) use electrical induction device to carry out preheating to die casting, make the temperature of described die casting rise to 180 degrees Celsius; Adopt this step to heat die casting, its object is to slow down the setting rate of liquid aluminium in mould, because die cavity 3, running channel 2.3 and cast gate 2.1 are all arranged on cover half 2 inside, if mold temperature is lower, due to the meeting heat conduction when contacting of the object between two temperature differences, can make the temperature of liquid aluminium reduce rapidly so, make the foundry goods 6 can not moulding, even if or moulding, but because Quench increases linear shrinkage, cause crackle and cracking.Therefore, in this enforcement, compression mod has been carried out to preheating procedure, made its temperature rise to 180 ℃;
3) liquid aluminium of high temperature is entered to running channel with pressure injection from the sprue bush of cover half of 80-120MPa, then continue liquid towards aluminium and keep this pressure, the liquid aluminium of promotion high temperature is filled in die cavity by running channel and cast gate successively with the filling speed of 50m/s, until liquid aluminium is full of die cavity;
4) liquid aluminium of die cavity inside is held to pressure, after liquid aluminium is full of described die cavity, continue to keep die cavity in the liquid aluminium pressure that applies 80-120MPa continue 6 seconds.
Holding and pressing the effect of operation is to make pressure chamber have time enough that pressure is passed to not solidified liquid aluminium, guarantees foundry goods 6 crystallization under pressure, strengthens feeding, to obtain fine and close tissue.
The length of holding the pressure time depends on the material of foundry goods 6, if hold pressure deficiency of time, easily causes shrinkage porosite, but holds pressure overlong time, does not have very large effect, and easily causes the excision of die casting machine to expect difficulty.In the present embodiment, through after many experiments, preferably will hold and press set of time to become 6 seconds.
5) hold press operation finish after 5 seconds time, start the hydraulic cylinder in partial Pressure mechanism, by Driven by Hydraulic Cylinder piston rod movement, by described piston rod, drive compacting pin to move in die cavity again, the aluminium solidifying in described compacting pin extrusion die cavity, the duricrust that breaks through metal surface enters into aluminium inside, aluminium material surface is subsided formed groove 6.1, this compacting pin enter aluminium inside keep afterwards this state and by the Driven by Hydraulic Cylinder after compacting pin its to aluminium internal pressurization;
Particularly, the design parameter of the partial Pressure mechanism in the present embodiment is as follows:
The range of choice of one, supercharging specific pressure Psq supercharging specific pressure: 150Mpa<Psq<250Mpa.Here considered semisolid aluminium to the resistance of compacting pin and mould the factor to ability to bear two aspects of high pressure.
Two, to establish the quality of thermal center place metal be Q to the volume of pumping chamber (the compressed volume of liquid aluminium) Vmax, and the volume before partial Pressure is V1, and density is ρ 1; Volume after supercharging is V2, and density is ρ 2.Because of Q=ρ 1 V1=ρ 2 V2;
So Vmax=V1-V2=V1(1-ρ 1/ ρ 2)
Three, the diameter D1 of the length L of pumping chamber and pressurization head is according to the relation of L and D1
L=4 Vmax/ΠD1
2，
L/D1<1.5 wherein, this has reflected the impact of the form factor of pumping chamber on pressurized effect.Four, piston diameter D3 is according to the dynamic balance relation on pressurization head:
D3=D1* (P
3q/ P
0) Po is die casting machine in formula system pressure five, pressurization time τ be after high speed filling. liquid metal forms after certain thickness duricrust, and suitable pressurization time is: τ=0.8-2S.
What be directed to that the present embodiment need to process is liquid aluminium, the partial Pressure mechanism parameter in this enforcement is chosen as follows: die casting machine system pressure P0=9MPa, supercharging specific pressure Psq elects 220MPa as.As calculated, D1=Φ 18mm, L=12mm, Ds=Φ 100mm.
6) keep pressurization 1.5 seconds, stop subsequently pressurization;
7) after 15 seconds, start clamping pressure machine described dynamic model and cover half are separated, then foundry goods 6 products after being shaped are taken out.
The above is only preferred embodiment of the present utility model, and protection domain of the present utility model is also not only confined to above-described embodiment, and all technical schemes belonging under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, in the some improvements and modifications that do not depart under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. the die casting that can prevent foundry goods shrinkage cavity, include dynamic model and cover half, described dynamic model can or close up with respect to described cover half separation, when described dynamic model and described cover half close up, on the composition surface of described dynamic model and described cover half, be formed with die cavity, on described cover half, be provided with cast gate, sprue bush and running channel, described cast gate is opened on described die cavity, described running channel is communicated with described die cavity by described cast gate, and described sprue bush is opened in described cover half surface and is communicated with described running channel
It is characterized in that: also include partial Pressure mechanism, described partial Pressure mechanism includes the compacting pin may extend in described die cavity.
2. die casting according to claim 1, is characterized in that: described partial Pressure mechanism is arranged in any one among both of described dynamic model or described cover half.
3. die casting according to claim 1, is characterized in that: on described dynamic model and described cover half, be provided with partial Pressure mechanism.
4. according to the die casting described in claim 2 or 3, it is characterized in that: on described dynamic model, offer through hole, described compacting pin is located in described through hole slidably, when described cover half is separated with described dynamic model, or when described cover half and described dynamic model have just closed up, the end of described compacting pin is concordant with described die cavity and can be by described die cavity sealing.
5. die casting according to claim 4, it is characterized in that: described partial Pressure mechanism includes hydraulic cylinder, described hydraulic cylinder is fixed on described dynamic model, on described hydraulic cylinder, is provided with piston rod, and described piston rod is located in described through hole and with described compacting pin and links.
6. die casting according to claim 5, is characterized in that: in described through hole, be provided with connecting rod, described connecting rod one end and described piston rod are fixed, and the other end is threaded connection with described compacting pin and fixes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420106846.9U CN203751307U (en) | 2014-03-10 | 2014-03-10 | Die-casting die capable of preventing shrinkage cavity of casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420106846.9U CN203751307U (en) | 2014-03-10 | 2014-03-10 | Die-casting die capable of preventing shrinkage cavity of casting |
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| Publication Number | Publication Date |
|---|---|
| CN203751307U true CN203751307U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420106846.9U Expired - Fee Related CN203751307U (en) | 2014-03-10 | 2014-03-10 | Die-casting die capable of preventing shrinkage cavity of casting |
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| CN (1) | CN203751307U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014760A (en) * | 2014-03-10 | 2014-09-03 | 宁波市俊博机械有限公司 | Die-casting die capable of preventing shrinkage cavity of casting and die-casting technique thereof |
| CN104907525A (en) * | 2015-07-17 | 2015-09-16 | 昆山莱捷有色金属有限公司 | Local pressurizing mold |
-
2014
- 2014-03-10 CN CN201420106846.9U patent/CN203751307U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014760A (en) * | 2014-03-10 | 2014-09-03 | 宁波市俊博机械有限公司 | Die-casting die capable of preventing shrinkage cavity of casting and die-casting technique thereof |
| CN104014760B (en) * | 2014-03-10 | 2017-03-01 | 宁波市俊博机械有限公司 | A kind of die casting that can prevent foundry goods shrinkage cavity and its extrusion process |
| CN104907525A (en) * | 2015-07-17 | 2015-09-16 | 昆山莱捷有色金属有限公司 | Local pressurizing mold |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20160310 |