CN101700566B - Press chamber for rheological die-casting and die-casting method - Google Patents
Press chamber for rheological die-casting and die-casting method Download PDFInfo
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- CN101700566B CN101700566B CN2009102415287A CN200910241528A CN101700566B CN 101700566 B CN101700566 B CN 101700566B CN 2009102415287 A CN2009102415287 A CN 2009102415287A CN 200910241528 A CN200910241528 A CN 200910241528A CN 101700566 B CN101700566 B CN 101700566B
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Abstract
The invention relates to a press chamber of a die-casting machine and a rheological die-casting method, in particular to a press chamber for rheological die-casting. The press chamber is in a cylinder shape and is characterized by comprising a cylinder body (2) which is arranged in a vertical plate (3) of the die-casting machine, one end of the cylinder is connected with an injection plunger (1) and the other end is connected with a mould static template (8), a valve body (6) is arranged in the cylinder, a pressure sensor (7) used for measuring the pressure born by the valve body is arranged above the vertical plate (3), a gap used for exhausting gases in the press chamber during injection is arranged above the cylinder body, and a transmission mechanism (5) is arranged on the side face of the vertical plate (3). During die-casting, the valve body is closed firstly, fusant is piled into a cylinder in the cylinder body of the press chamber and the temperature thereof is controlled, and then the valve body is opened to complete die-casting. Compared with other processes of liquid die-casting and semi-solid die-casting, the invention has the advantages of short process flow, capability of avoiding fusant trapped gas and oxidation inclusion, simple structure and wide application range.
Description
Technical field
The present invention relates to a kind of horizontal plunger die casting machine and press chamber and rheo-diecasting method, belong to non-ferrous metal preparation and manufacture field.
Background technology
Because auto industry fast development, the die casting demand of aluminium, magnesium alloy also enlarge rapidly.The horizontal cold-chamber die casting machine that is to use that extensively adopts carries out liquid die casting at present.Adopt this explained hereafter die casting machine efficient height, the die casting machine tonnage is selected flexibly, and equipment loss is low.But in the injection process of liquid metal, because liquid fluctuating and high speed are filled type, inevitably cause the involute gas of liquid metal, make the die casting of producing have pore, the die casting mechanical property is relatively poor.For solving volume gas problem in the die casting, twentieth century end semisolid die-casting technique is developed.Develop the semisolid extrusion process that at first and adopt thixotroping die casting route, its technological process is at first to prepare the semi-solid blank with non-dendritic structure, then with the blank post bake to semi solid zone, blank can keep justifying the base shape and had simultaneously and good flowability this moment.The volume gas that this circular blank has avoided liquid fluctuating to cause in injection and cavity filling process makes die casting have excellent mechanical property.But thixotropic forming has increased base and two operations of post bake, has improved production cost; The oxide skin that forms in the post bake process enters die casting formation and is mingled with in filling type, these have all limited applying of thixotroping die casting.Be shortened process, developed the rheo-diecasting technology of various ways in recent years, its basic principle is that melt is handled, and makes its formation have the semi solid slurry of the spherical primary phase of certain volume mark, then slurry is directly filled type die casting.Because the viscosity of semi solid slurry is higher than liquid state, therefore inhibition to a certain degree the volume gas phenomenon in the liquid metal.But owing in the rheo-diecasting technology, transmit smoothly for making slurry, the fraction solid in the semi solid slurry is lower, be usually less than 10%, therefore slurry still has good flowability, this cause slurry in injection and when filling type liquid level still can fluctuate, roll up the gas phenomenon and can not avoid fully.The present invention is by adopting novel pressure cell structure, the advantage of traditional thixotropic forming and rheological molding combined form a kind of new rheo-diecasting technology, can avoid the generation of the involute gas phenomenon of liquid metal on the basis that guarantees short flow process again.
Summary of the invention
The invention provides a kind of rheo-diecasting with pressing chamber and pressure casting method, carry out rheo-diecasting on die casting machine, can solve volume gas phenomenon in the press casting procedure, avoid the formation of oxide inclusion, finally improve the mechanical property of die casting by this pressure chamber is installed.
For achieving the above object, the present invention takes following technical scheme:
This rheo-diecasting is with pressing cell structure, this pressure chamber is a tubular, it comprises: be installed in the cylindrical shell in the die casting machine riser, cylindrical shell one termination and injection punch head, the quiet template of another termination mould is equipped with valve body in the cylindrical shell, be equipped with on the riser to be used to measure the pressure size pressure sensor that valve body bears, the cylindrical shell top has one to be used for the gap that injection process presses indoor gas to discharge, and the riser side is equipped with transmission mechanism.
Described gap 0＜b≤3mm..
The position sensor (4) that is used to control the injection punch head motion is installed on driving mechanism.
Valve body via transmission device realizes opening and closing motion, under the valve body open mode, presses the chamber cylindrical shell unobstructed fully; Under the valve body closed condition, valve body will be pressed the lower end complete closed of chamber cylindrical shell, and the gap is left in the upper end.Position sensor on the transmission mechanism near melt outflow end one side, is equipped with pressure sensor near valve body in riser, sensor signal directly enters the die casting machine injection control system.
A kind of method of using die casting machine pressure of the present invention chamber to carry out rheo-diecasting, this method comprises following step:
1) valve body is closed, a certain amount of metal bath flows into end from the melt of pressing the chamber and flows to the inner barrel of pressing the chamber;
2) injection plunger travels forward, and promotes also motion forward of metal bath, is subjected to the obstruction of valve body, and melt begins to pile up gradually behind valve body;
3) along with injection plunger constantly advances, melt is piled into cylinder gradually between injection plunger and valve body, presses indoor gas to discharge from slit, valve body upper end simultaneously, and the pressure that bears on the valve body also increases gradually.
4) arrive setting value when the pressure sensor upward pressure, the injection plunger stop motion, metal bath press indoor leave standstill 1～10s after, the transmission mechanism motion of valve body is opened valve body fast;
5) after valve body was opened and put in place, the position sensor output signal on the transmission mechanism made the quick injection of injection plunger to the die casting machine control system, finish the injection cavity filling process;
6) finish die casting taking-up, mold cleaning and injection plunger and push back after, valve body is closed, and prepares press casting procedure next time.
Advantage of the present invention is:
The present invention is by pressing the indoor valve body that is provided with, metal bath is piled into cylinder and the melt solid volume fraction is increased to carry out die casting again after surpassing 40% in pressing the chamber, effectively avoided on the one hand the volume gas phenomenon of pressing indoor melt liquid level fluctuation to cause, melt indoor leave standstill cooling melt viscosity is increased pressing on the other hand, so both guaranteed the Laminar Flow in the cavity filling process, avoid the surface oxidation problem in the conventional post bake process again, eliminated oxide inclusion and gas hole defect in the die casting.The present invention controls the motion of valve body by sensor, and sensor signal is directly imported the die casting machine control system, transforms on existing die casting machine and presses cell structure to implement, and is simple.
Description of drawings
Fig. 1 a uses for rheo-diecasting of the present invention and presses the cell structure front view
Fig. 1 b is the right side view of Fig. 1 a
Fig. 2 valve body motion work schematic diagram
Fig. 3 a is that melt pours into pressure chamber process schematic diagram
Fig. 3 b is that melt is piled into the cylinder schematic diagram
Fig. 3 c is that schematic diagram is finished in die casting
As shown in Figure 1, rheo-diecasting of the present invention is installed in the die casting machine riser 3 with the pressure chamber, and pressing chamber main body 2 is a tubular construction, presses chamber one end to link to each other with injection punch head 1, and the other end links to each other with the quiet template 8 of mould.Valve body 6 and pressure sensor 7 are installed in riser 3, and valve body is done the open and close motion under the drive of transmission mechanism 5.It is unobstructed fully to press down chamber cylindrical shell 2 in open mode, descends valve body will press chamber cylindrical shell base closed in off position, only above pressing the chamber gap less than 3mm is arranged.Two pressure sensors 7 are fixed on adjacent valve body 6 on the riser 3.Transmission mechanism 5 relies on the cylinder or the hydraulic cylinder 9 that are installed on the riser 3 to drive.Position sensor 4 is installed on hydraulic cylinder 9.
The specific embodiment
In the specific implementation process, transmission mechanism 5 is installed on the die casting machine riser 3, valve body 6 is installed in the riser 3.Before melt cast was indoor to pressure, first valve body 6 put each parameter setting of die casting machine in place.The metal bath that after ready pulping process is obtained imports in the cylindrical shell 2 of pressing the chamber, injection punch head 1 is travelled forward, stopped by valve body 6, pile up gradually in the space of melt between injection punch head 1 and valve body 6, gas in the space is discharged from slit, valve body top gradually, banking process increases pressure sensor 7 pressure that bears gradually, when pressure is increased to a little less than die casting machine slow shot system pressure, injection punch head 1 stop motion, this moment, semi solid slurry was piled into cylinder substantially in pressing chamber cylindrical shell 2, melt reduces the metal bath temperature pressing the indoor time of leaving standstill setting gradually.Time of repose is by temperature of pressing indoor melt and quality decision.When melt temperature is reduced to corresponding alloy phase diagram solid volume fraction in 40～60% scopes, transmission mechanism 5 is opened valve body 6, and transmission mechanism 5 relies on hydraulic cylinders or cylinder 9 to drive, as shown in Figure 2.The interior solid volume fraction of melt is increased to above 40% in the process owing to leave standstill, and after valve body is opened, presses the semi solid slurry in the cylindrical shell of chamber can keep cylindrical shape constant.After transmission mechanism 5 upper position sensor 4 demonstration valve bodies were opened and put in place, injection punch head 1 promotion semi solid slurry travelled forward and finishes injection stamp process.Semisolid press casting procedure schematic diagram as shown in Figure 3.
Aluminium alloy A 356, this alloy solid-liquid phase line interval is 575～613 ℃.Die casting machine is 280 tons of bedroom cold-chamber die casting machines.Behind the alloy melting, be prepared into semi solid slurry, will press the chamber valve body to close simultaneously with the electromagnetism stirring technique.The semi solid slurry of making imported to press indoorly, injection punch head is pushed ahead, and semi solid slurry is blocked in by valve and presses the indoor cylinder of being piled into gradually.After valve rear pressure sensor reaches 15MPa, the injection punch head stop motion, semi solid slurry is being pressed the indoor 5s that leaves standstill, slurry temperature is reduced to about 590 ℃, it is about 40% that corresponding fraction solid is increased to gradually, and transmission mechanism drives valve open, and this moment, semi solid slurry kept cylindrical shape constant.After the hydraulic cylinder upper position sensor showed that valve open puts in place, injection punch head promoted the semisolid cylinder and continues motion, and semi solid slurry charges into and finishes the injection cavity filling process in the mould.Carry out pickup and mould subsequently and press chamber clean, finish late gate and close and begin press casting procedure next time.
Claims (4)
1. a rheo-diecasting is with pressing the chamber, this pressure chamber is a tubular, it is characterized in that: it comprises: be installed in the cylindrical shell (2) in the die casting machine riser (3), cylindrical shell one is terminated at injection punch head (1), the quiet template of another termination mould (8) is equipped with valve body (6) in the cylindrical shell, be equipped with on the riser (3) to be used to measure the pressure size pressure sensor (7) that valve body bears, the cylindrical shell top has one to be used for the gap that injection process presses indoor gas to discharge, and the riser side is equipped with transmission mechanism (5).
2. use according to the described a kind of rheo-diecasting of claim 1 and press the chamber, it is characterized in that described gap 0＜b≤3mm.
3. use according to the described a kind of rheo-diecasting of claim 1 and press the chamber, it is characterized in that, the position sensor (4) that is used to control the injection punch head motion is installed on driving mechanism.
4. one kind is used the described rheo-diecasting of the claim 1 rheo-diecasting method of pressing the chamber, it is characterized in that it comprises following step:
1) valve body is closed, a certain amount of metal bath flows into end from the melt of pressing the chamber and flows to the inner barrel of pressing the chamber;
2) injection punch head travels forward, and promotes also motion forward of metal bath, is subjected to the obstruction of valve body, and melt begins to pile up gradually behind valve body;
3) along with injection punch head constantly advances, melt is piled into cylinder gradually between injection punch head and valve body, presses indoor gas to discharge from slit, valve body upper end simultaneously, and the pressure that bears on the valve body also increases gradually;
4) arrive 15MPa when the pressure sensor upward pressure, the injection punch head stop motion, metal bath press indoor leave standstill 1～10s after, the transmission mechanism motion of valve body is opened valve body fast;
5) after valve body was opened and put in place, the position sensor output signal on the transmission mechanism made the quick injection of injection punch head to the die casting machine control system, finish the injection cavity filling process;
6) finish die casting taking-up, mold cleaning and injection punch head and push back after, valve body is closed, and prepares press casting procedure next time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102415287A CN101700566B (en) | 2009-11-25 | 2009-11-25 | Press chamber for rheological die-casting and die-casting method |
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| CN2009102415287A CN101700566B (en) | 2009-11-25 | 2009-11-25 | Press chamber for rheological die-casting and die-casting method |
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| CN101700566A CN101700566A (en) | 2010-05-05 |
| CN101700566B true CN101700566B (en) | 2011-09-07 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116140580B (en) * | 2023-04-17 | 2023-09-05 | 宁波力劲科技有限公司 | Cold chamber die casting machine with large injection quantity |
| CN117600438B (en) * | 2024-01-23 | 2024-04-12 | 宁波力劲科技有限公司 | Rapid die casting method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042322A (en) * | 1988-10-29 | 1990-05-23 | 上海电器压铸厂 | The injection device of cold horizontal type die-casting facility |
| CN101130203A (en) * | 2007-10-19 | 2008-02-27 | 北京科技大学 | Method for preparing semi-solid metal slurry and rheologic molding |
| CN101296769A (en) * | 2005-10-24 | 2008-10-29 | 布勒压力铸造股份公司 | Diecasting process and diecasting device |
-
2009
- 2009-11-25 CN CN2009102415287A patent/CN101700566B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042322A (en) * | 1988-10-29 | 1990-05-23 | 上海电器压铸厂 | The injection device of cold horizontal type die-casting facility |
| CN101296769A (en) * | 2005-10-24 | 2008-10-29 | 布勒压力铸造股份公司 | Diecasting process and diecasting device |
| CN101130203A (en) * | 2007-10-19 | 2008-02-27 | 北京科技大学 | Method for preparing semi-solid metal slurry and rheologic molding |
Non-Patent Citations (2)
| Title |
|---|
| 田战峰等.金属半固态触变压铸工艺的探讨.《铸造技术》.2005,第26卷(第1期),28-31、33. * |
| 田战峰等.铝合金半固态触变压铸试验研究.《轻金属》.2005,(第9期),42-46. * |
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Effective date of registration: 20190626 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
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Effective date of registration: 20210721 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan metal composite technology Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |