CN103008601B - Pulse discharge auxiliary die-casting device and method - Google Patents
Pulse discharge auxiliary die-casting device and method Download PDFInfo
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- CN103008601B CN103008601B CN201310025043.0A CN201310025043A CN103008601B CN 103008601 B CN103008601 B CN 103008601B CN 201310025043 A CN201310025043 A CN 201310025043A CN 103008601 B CN103008601 B CN 103008601B
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Abstract
The invention discloses pulse discharge auxiliary die-casting device and method, relates to discharge plasma die-casting device and method, belongs to the field of die-casting technologies and aims to solve the problems that the existing die-casting technology is high in energy consumption, preparation material is low in density, complex parts cannot be manufactured due to uneven pulse discharge temperature and pressure in the pulse discharge sintering technology. The pulse discharge auxiliary die-casting device comprises a feed rod, a hopper cover, a hopper, a graphite die, a graphite electrode, an auxiliary die, a die and a guide tube. The graphite die, the graphite electrode, a copper electrode and a graphite press head are added on the basis of conventional die-casting for pulse discharge, raw material applies machining residual metal scrap or waste metal fragments, material is placed in the hopper and pushed into the graphite die to be subjected to vacuum pumping, strong pulse is applied to two ends of the material to melt the material, and molten metal is extruded into a die cavity for forming. The pulse discharge auxiliary die-casting device and method are mainly applied to the die-casting technical fields, and waste raw material is effectively utilized to achieve environment friendliness.
Description
Technical field
The present invention relates to a kind of discharge plasma die casting equipment and method, belong to die-casting technique field.
Background technology
Along with scientific and technological development, people are increasing to the demand of material and the energy, need us to tap a new source of energy and exploit raw material on the one hand, from the angle of sustainable development, more need to be from how saving the energy, and how more to make full use of raw-material angle and seek new solution.Can be by the material of using if just think, the laughable tank that for example aluminium is done, residual cutting swarf after processing, can recycling, can successfully manage above problem.
Traditional extrusion process is to adopt molten metal under the effect of drift, to enter die cavity after coagulation to be shaped, and for old metal, just needs refuse, and this will be because of its oxidation and material unaccounted-for (MUF).During die casting simultaneously, need to be incubated melt, this just need to consume more energy, if old metal bits directly can be melted or make semisolid die casting, can utilize to a greater extent material.Adopt traditional heating mode that metal fillings is heated, exist the heat time long, efficiency is low, and prepared material density is low, is oxidized the problems such as serious.If these metal fillings remeltings, owing to having larger specific area, serious oxidation can occur when heating, one is unfavorable for the control of alloying component, can introduce impurity, has also caused in addition the waste of material.
Process of pulse discharge, except having the Joule heat and plastic deformation acceleration of sintering process of hot pressed sintering, also produces DC pulse voltage between powder particle, and has effectively utilized the spontaneous heating effect of discharge generation between powder granule.Thereby produced the peculiar phenomenon that is conducive to heating of some process of pulse discharges.The first, due to the discharge impact ripple of Pulsed Discharge and electronics, ion reciprocal flow at high speed in electric field, can make the gas loss of powder absorption.The initial oxidation film of powder surface is breakdown to a certain extent, makes powder be purified, activate; Second, because pulse is moment, interrupted, high-frequency generation, at the powder particle heat discharge that contact site does not produce, and the Joule heat of powder particle contact site generation, all greatly promoted the diffusion of powder particle atom, much bigger than under common hot pressing condition of its diffusion coefficient, thus reach the rapid melting of powder; The 3rd, the adding of On-Off fast-pulse, make electric discharge position and joule heat generating components in powder, all can fast moving, make the heating of powder can homogenising.
Yet concerning actual production, the uneven distribution of temperature during due to pulsed discharge, in addition, because the pressure loading in this process is axial one direction, or twocouese pressure, pressure is inhomogeneous, be difficult to prepare complex-shaped parts, fettered the application of this technology, need to improve equipment, the phenomenon of temperature and pressure skewness in sample when eliminating sintering; Need to increase its capacity multi-functional and pulse current, to meet the needs of preparation large scale product; Because at present apply pulse electric discharge is carried out when powder sintered being under pressure, the restriction of mould, is difficult to prepare that some are large-scale, complex-shaped material; Also need to develop, repeat usage better novel die material higher than the mold materials graphite intensity of using at present, to improve the bearing capacity of mould and the expense of reduction mould.
Summary of the invention
The object of the invention is that high, the prepared material density of existing die-casting technique energy consumption is low in order to solve, the inhomogeneous problem that causes preparing complex component of pulsed discharge temperature and pressure in pulsed discharge sintering technology, the invention provides the auxiliary die casting equipment of a kind of pulsed discharge and method.
Die casting equipment is assisted in a kind of pulsed discharge, it comprises follower arm, hopper cover, hopper, graphite jig, graphite electrode, auxiliary mould, mould, conduit, described hopper cover is that axle is connected with hopper, described auxiliary mould is provided with cavity, discharging opening and charging aperture, in described cavity, be provided with graphite electrode, described graphite electrode is the slab construction with through hole, this graphite electrode can move up and down in cavity, on the sidewall of described auxiliary mould, be fixed with copper electrode, this copper electrode is electrically connected to all the time with graphite electrode, auxiliary mould is fixed on charging aperture one side of mould, and the discharging opening of auxiliary mould is communicated with the charging aperture of mould, insert in the charging aperture of auxiliary mould one end of described conduit, and be fixedly connected with auxiliary mould, on one end inwall of described conduit, embed and be fixed with columnar graphite jig, this graphite jig along catheter shaft to length be L1, on the sidewall of conduit, be fixed with hopper, and the bottom of hopper is communicated with the inner chamber of conduit, this hopper closes on a side of auxiliary mould and the air line distance between this auxiliary mould is greater than L1, one end of described follower arm is with graphite pressure head, the other end of follower arm is copper electrode, with one end of graphite pressure head, insert in conduit, the cavity of auxiliary mould is communicated with by vacuum tube with the inner chamber of hopper, the die cavity of mould, the cavity of auxiliary mould, the inner chamber of hopper forms with the inner chamber of conduit the space being communicated with.
Described graphite electrode is between the charging aperture and discharging opening of auxiliary mould, for isolating described charging aperture and discharging opening.
The through hole of described graphite electrode, between the charging aperture and discharging opening of auxiliary mould, makes the charging aperture of auxiliary mould be communicated with discharging opening.
The internal diameter of the charging aperture of described auxiliary mould is less than the internal diameter of discharging opening.
The two ends of the through hole of described graphite electrode are relative with its discharging opening with the charging aperture of auxiliary mould respectively, and the internal diameter of one end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, the internal diameter of one end that this through hole is adjacent with discharging opening is identical with the internal diameter of described discharging opening.
Adopt the auxiliary die casting equipment of described pulsed discharge to realize the method for die casting, the process of the method for described die casting is, first make the through hole of graphite electrode between the charging aperture and discharging opening of auxiliary mould, make charging aperture and the discharging opening of graphite electrode isolation auxiliary mould;
Inner chamber by hopper conductive pipe adds materials, and then hopper cover is covered tightly, and the connected space that the cavity of the die cavity of mould, auxiliary mould, its discharging opening, the inner chamber of hopper and the inner chamber of conduit are formed vacuumizes, and makes vacuum reach 0.1MPa～10
-2pa, now, material is arranged in the confined space that graphite pressure head, graphite jig and graphite electrode form;
Logical pulse current between graphite jig, graphite electrode and graphite pressure head, add thermal material, after material all melts, keep electric current constant, mobile graphite electrode after 0～10 minute, make the through hole of graphite electrode between the charging aperture and discharging opening of auxiliary mould, the charging aperture of auxiliary mould and discharging opening are communicated with;
Promoting follower arm enters into the molten metal of melting in the die cavity of mould by the through hole of graphite electrode and the discharge opening of auxiliary mould, the pressure of controlling follower arm in promoting the process of follower arm is at 0～200Mpa, after the molten metal of the melting in the die cavity of wait mould solidifies, complete die casting.
The pulse frequency of described pulse current is 5～200Hz, and the size of current of pulse current is the DC-pulse of 200～8000A.
The present invention adds graphite jig, graphite electrode, copper electrode and graphite pressure head to carry out pulsed discharge on the basis of traditional die casting.Raw material adopts the metal fillings of residual processing, or waste metal fragment, and material is put into after hopper, pushes in graphite jig, vacuumizes, and two ends apply By Impulsive Current melts material, then motlten metal is squeezed into mold cavity moulding.
The present invention has realized casting die and has saved energy consumption 15%～30%, can prepare complex component, and the density of material of preparation improves 2%～10%, performance is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the auxiliary die casting equipment of a kind of pulsed discharge of the present invention;
Fig. 2 is that the pressure casting method described in the specific embodiment six carries out in the process of heating material, view during heating material;
Fig. 3 is that the pressure casting method described in the specific embodiment six carries out after heating material, the material state schematic diagram when keeping electric current constant after material melting;
The material state schematic diagram of Fig. 4 when to be pressure casting method described in the specific embodiment six push fixing shaping after mould by material after fusing.
The specific embodiment
The specific embodiment one: present embodiment is described referring to Fig. 1, the auxiliary die casting equipment of a kind of pulsed discharge described in present embodiment, it comprises follower arm 1, hopper cover 2, hopper 3, graphite jig 5, graphite electrode 6, auxiliary mould 7, mould 8, conduit 12, described hopper cover 2 and hopper 3 are connected for axle, described auxiliary mould 7 is provided with cavity 9, discharging opening 10 and charging aperture, in described cavity 9, be provided with graphite electrode 6, described graphite electrode 6 is the slab construction with through hole, this graphite electrode 6 can move up and down in cavity 9, on the sidewall of described auxiliary mould 7, be fixed with copper electrode 1-1, this copper electrode 1-1 is electrically connected to all the time with graphite electrode 6, auxiliary mould 7 is fixed on charging aperture one side of mould 8, and the discharging opening 10 of auxiliary mould 7 is communicated with the charging aperture of mould 8, insert in the charging aperture of auxiliary mould 7 one end of described conduit 12, and be fixedly connected with auxiliary mould 7, on one end inwall of described conduit 12, embed and be fixed with columnar graphite jig 5, this graphite jig 5 is L1 along the axial length of conduit 12, on the sidewall of conduit 12, be fixed with hopper 3, and the bottom of hopper 3 is communicated with the inner chamber of conduit 12, this hopper 3 closes on a side of auxiliary mould 7 and the air line distance between this auxiliary mould 7 is greater than L1, one end of described follower arm 1 is with graphite pressure head 1-2, the other end of follower arm 1 is copper electrode 1-1, with one end of graphite pressure head 1-2, insert in conduit 12, the cavity 9 of auxiliary mould 7 is communicated with by vacuum tube with the inner chamber of hopper 3, the die cavity of mould 8, the cavity 9 of auxiliary mould 7, the inner chamber of hopper 3 forms with the inner chamber of conduit 12 space being communicated with.
The specific embodiment two: the difference of the auxiliary die casting equipment of a kind of pulsed discharge described in present embodiment and the specific embodiment one is, described graphite electrode 6 is between the charging aperture and discharging opening 10 of auxiliary mould 7, for isolating described charging aperture and discharging opening 10.
The specific embodiment three: the difference of the auxiliary die casting equipment of a kind of pulsed discharge described in present embodiment and the specific embodiment one is, the through hole of described graphite electrode 6, between the charging aperture and discharging opening 10 of auxiliary mould 7, makes the charging aperture of auxiliary mould 7 be communicated with discharging opening 10.
The specific embodiment four: a kind of pulsed discharge described in present embodiment and the specific embodiment one assists the difference of die casting equipment to be, the internal diameter of the charging aperture of described auxiliary mould 7 is less than the internal diameter of discharging opening 10.
The specific embodiment five: the difference of the auxiliary die casting equipment of a kind of pulsed discharge described in present embodiment and the specific embodiment three is, the two ends of the through hole of described graphite electrode 6 are relative with its discharging opening 10 with the charging aperture of auxiliary mould 7 respectively, and the internal diameter of one end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, the internal diameter of one end that this through hole is adjacent with discharging opening 10 is identical with the internal diameter of described discharging opening 10.
The specific embodiment six: present embodiment is described referring to Fig. 2, Fig. 3 and Fig. 4, present embodiment is the method that the auxiliary die casting equipment of the pulsed discharge described in the employing specific embodiment one is realized die casting, the process of the method for described die casting is, first make the through hole of described graphite electrode 6 between the charging aperture and discharging opening 10 of auxiliary mould 7, make charging aperture and the discharging opening 10 of graphite electrode 6 isolation auxiliary moulds 7;
Inner chamber by hopper 3 conductive pipe 12 adds materials, then hopper cover 2 is covered tightly, the connected space that the cavity 9 of the die cavity of mould 8, auxiliary mould 7, its discharging opening 10, the inner chamber of hopper 3 and the inner chamber of conduit 12 are formed vacuumizes, and makes vacuum reach 0.1MPa～10
-2pa, now, material is arranged in the confined space that graphite pressure head 1-2, graphite jig 5 and graphite electrode 6 form;
Logical pulse current between graphite jig 5, graphite electrode 6 and graphite pressure head 1-2, add thermal material, after material all melts, keep electric current constant, mobile graphite electrode 6 after 0～10 minute, make the through hole of graphite electrode 6 between the charging aperture and discharging opening 10 of auxiliary mould 7, the charging aperture of auxiliary mould 7 and discharging opening 10 are communicated with;
Promoting follower arm 1 enters into the molten metal of melting in the die cavity of mould 8 by the through hole of graphite electrode 6 and the discharge opening of auxiliary mould 7, the pressure of controlling follower arm 1 in promoting the process of follower arm 1 is at 0～200Mpa, after the molten metal of the melting in the die cavity of wait mould 8 solidifies, complete die casting.
The specific embodiment seven: the difference of the auxiliary pressure casting method of a kind of pulsed discharge described in present embodiment and the specific embodiment six is, the pulse frequency of described pulse current is 5～200Hz, and the size of current of pulse current is the DC-pulse of 200～8000A.
In present embodiment, except exerting pressure between graphite pressure head 1-2, also applied DC pulse electric discharge, the plastic deformation acceleration of sintering process causing except Joule heat and pressurization in this process, also between powder particle, produce DC pulse voltage, under pulse current effect, between particle, produce electric discharge, activated plasma, by effectively utilizing the spontaneous heating effect of discharge generation between powder granule, this device has produced some distinctive phenomenons that are conducive to powder rapid melting.The first, due to the discharge impact ripple of Pulsed Discharge and electronics, ion reciprocal flow at high speed in electric field, can make the gas loss of powder absorption, the initial oxidation film of powder surface is breakdown to a certain extent, makes powder be purified, activate; Second, because pulse is moment, interrupted, high-frequency generation, at the powder particle heat discharge that contact site does not produce, and the Joule heat of powder particle contact site generation, all greatly promoted the diffusion of powder particle atom, much bigger than under common hot pressing condition of its diffusion coefficient, thus reach powder rapid melting; The 3rd, the adding of On-Off fast-pulse, make electric discharge position and joule heat generating components in powder, all can fast moving, make the heating of powder can homogenising.Making pulse concentrate on crystal grain junction is the feature that DC-pulse applies process.DC-pulse applies in process, while discharging between particle, can instantaneous generation spend to the localized hyperthermias of 10,000 degree up to several thousand, thereby accelerate the fusing of particle, in general, the implementation process of this device can be regarded as the result of particle electric discharge, conductive heater and pressurization comprehensive function.
In process of pulse discharge, while discharging between particle, can instantaneous generation spend to the localized hyperthermias of 10,000 degree up to several thousand, at particle surface, cause evaporation and fusing; At grain contact point, form neck, because heat is delivered to particle surface and immediately to surrounding diffusion from heating center, neck is cooling and make vapour pressure lower than other positions fast; Crystal grain is all strengthened by effect, body diffusion, the crystal boundary diffusion of Current Heating and vertical uniaxial pressure, has accelerated densification process.
The present invention combines die-casting technique and pulsed discharge sintering technology, utilizes pulsed discharge to make metal fillings Fast Heating reach fusing or semi-solid state, utilizes die-casting technique by melting or semi-solid molten metal extrusion forming.Can realize twice laid like this, for example, after processing remaining cutting swarf, the metal after use, waits as raw material; Realize energy-saving and emission-reduction, because the efficiency of pulsed discharge is high, can reduce the energy consumption of metal molten; The material that processability is good, the material prepared due to pulsed discharge has even tissue, thus the tiny performance of material that makes of crystal grain is improved; Prepare baroque parts, pulsed discharge sintering is owing to being under pressure and the restriction of mould can not be prepared complex component, but utilizes die casting the stress metal compacted under after pulsed discharge can be prepared to Complex Parts, and realizes continuously and producing.
Claims (7)
1. die casting equipment is assisted in a pulsed discharge, it is characterized in that, it comprises follower arm (1), hopper cover (2), hopper (3), graphite jig (5), graphite electrode (6), auxiliary mould (7), mould (8), conduit (12), described hopper cover (2) and hopper (3) are connected for axle, described auxiliary mould (7) is provided with cavity (9), discharging opening (10) and charging aperture, in described cavity (9), be provided with graphite electrode (6), described graphite electrode (6) is the slab construction with through hole, this graphite electrode (6) can move up and down in cavity (9), on the sidewall of described auxiliary mould (7), be fixed with copper electrode (1-1), this copper electrode (1-1) is electrically connected to all the time with graphite electrode (6), auxiliary mould (7) is fixed on charging aperture one side of mould (8), and the discharging opening (10) of auxiliary mould (7) is communicated with the charging aperture of mould (8), insert in the charging aperture of auxiliary mould (7) one end of described conduit (12), and be fixedly connected with auxiliary mould (7), on one end inwall of described conduit (12), embed and be fixed with columnar graphite jig (5), this graphite jig (5) is L1 along the axial length of conduit (12), on the sidewall of conduit (12), be fixed with hopper (3), and the bottom of hopper (3) is communicated with the inner chamber of conduit (12), this hopper (3) closes on a side of auxiliary mould (7) and the air line distance between this auxiliary mould (7) is greater than L1, one end of described follower arm (1) is with graphite pressure head (1-2), the other end of follower arm (1) is copper electrode (1-1), with one end of graphite pressure head (1-2), insert in conduit (12), the cavity (9) of auxiliary mould (7) is communicated with by vacuum tube with the inner chamber of hopper (3), the die cavity of mould (8), the cavity (9) of auxiliary mould (7), the inner chamber of hopper (3) forms with the inner chamber of conduit (12) space being communicated with.
2. die casting equipment is assisted in a kind of pulsed discharge according to claim 1, it is characterized in that, described graphite electrode (6) is positioned between the charging aperture and discharging opening (10) of auxiliary mould (7), for isolating described charging aperture and discharging opening (10).
3. die casting equipment is assisted in a kind of pulsed discharge according to claim 1, it is characterized in that, the through hole of described graphite electrode (6) is positioned between the charging aperture and discharging opening (10) of auxiliary mould (7), and the charging aperture of auxiliary mould (7) is communicated with discharging opening (10).
4. the auxiliary die casting equipment of a kind of pulsed discharge according to claim 1, is characterized in that, the internal diameter of the charging aperture of described auxiliary mould (7) is less than the internal diameter of discharging opening (10).
5. die casting equipment is assisted in a kind of pulsed discharge according to claim 3, it is characterized in that, the two ends of the through hole of described graphite electrode (6) are relative with its discharging opening (10) with the charging aperture of auxiliary mould (7) respectively, and the internal diameter of one end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, the internal diameter of one end that this through hole is adjacent with discharging opening (10) is identical with the internal diameter of described discharging opening (10).
6. adopt the auxiliary die casting equipment of a kind of pulsed discharge claimed in claim 1 to realize the method for die casting, it is characterized in that, the process of described pressure casting method is: first make described graphite electrode (6) be positioned between the charging aperture and discharging opening (10) of auxiliary mould (7), make charging aperture and the discharging opening (10) of graphite electrode (6) isolation auxiliary mould (7);
Inner chamber by hopper (3) conductive pipe (12) adds materials, then hopper cover (2) is covered tightly, the connected space that the inner chamber of the inner chamber of the cavity (9) of the die cavity of mould (8), auxiliary mould (7), discharging opening (10), hopper (3) and conduit (12) is formed vacuumizes, and makes vacuum reach 0.1MPa～10
-2pa, now, material is arranged in the confined space that graphite pressure head (1-2), graphite jig (5) and graphite electrode (6) form;
Logical pulse current between graphite jig (5), graphite electrode (6) and graphite pressure head (1-2), add thermal material, after material all melts, keep electric current constant, mobile graphite electrode (6) after 0～10 minute, the through hole of graphite electrode (6) is positioned between the charging aperture and discharging opening (10) of auxiliary mould (7), and the charging aperture of auxiliary mould (7) and discharging opening (10) are communicated with;
Promoting follower arm (1) enters into the molten metal of melting in the die cavity of mould (8) by the through hole of graphite electrode (6) and the discharge opening of auxiliary mould (7), the pressure of controlling follower arm (1) in promoting the process of follower arm (1) is at 0～200Mpa, after the molten metal of the melting in the die cavity of wait mould (8) solidifies, complete die casting.
7. method according to claim 6, is characterized in that, the pulse frequency of described pulse current is 5～200Hz, and the size of current of pulse current is the DC-pulse of 200～8000A.
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| CN201310025043.0A CN103008601B (en) | 2013-01-23 | 2013-01-23 | Pulse discharge auxiliary die-casting device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106077655A (en) * | 2016-08-01 | 2016-11-09 | 哈尔滨理工大学 | A kind of pulsed discharge aluminium section bar process units and method |
| CN106111988A (en) * | 2016-08-01 | 2016-11-16 | 哈尔滨理工大学 | A kind of pulsed discharge copper section bar process units and method |
| CN106216681A (en) * | 2016-08-01 | 2016-12-14 | 哈尔滨理工大学 | A kind of pulsed discharge swage material process units and method |
| CN106216682A (en) * | 2016-08-01 | 2016-12-14 | 哈尔滨理工大学 | A kind of pulsed discharge titanium-type material process units and method |
| CN110605372B (en) * | 2019-11-18 | 2020-03-20 | 常州铭赛机器人科技股份有限公司 | Metal hot-press forming device |
| CN110586900B (en) * | 2019-11-18 | 2020-03-20 | 常州铭赛机器人科技股份有限公司 | Hot-press forming method of metal hot-press forming device |
| CN112658221B (en) * | 2020-12-04 | 2022-05-06 | 西安交通大学 | Continuous casting method of high-entropy alloy |
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| JPS5594773A (en) * | 1979-01-09 | 1980-07-18 | Nissan Motor Co Ltd | Method and apparatus for die-casting |
| JPS5843177B2 (en) * | 1979-01-26 | 1983-09-26 | 本田技研工業株式会社 | How to fill molten metal in vertical die casting machine |
| DE3640370A1 (en) * | 1985-11-26 | 1987-05-27 | Ube Industries | INJECTION METHOD OF AN INJECTION MOLDING MACHINE |
| JPS63303671A (en) * | 1986-03-10 | 1988-12-12 | Ube Ind Ltd | Casting method and apparatus thereof |
| US5076344A (en) * | 1989-03-07 | 1991-12-31 | Aluminum Company Of America | Die-casting process and equipment |
| JP3049648B2 (en) * | 1993-12-13 | 2000-06-05 | 日立金属株式会社 | Pressure molding method and pressure molding machine |
| JPH1119759A (en) * | 1997-06-30 | 1999-01-26 | Hitachi Metals Ltd | Casting method for die casting and apparatus thereof |
| JPH11291001A (en) * | 1998-04-14 | 1999-10-26 | Nippon Steel Corp | Plasma heater and method for heating material to be heated by using the same |
| RU2252108C2 (en) * | 2002-08-05 | 2005-05-20 | Владимирский Государственный Университет (ВлГУ) | Pressure die casting method and apparatus for performing the same |
| CN1539576A (en) * | 2003-04-23 | 2004-10-27 | 山田藤夫 | Appts and method for smelting material |
| JP2005138116A (en) * | 2003-11-04 | 2005-06-02 | Meiki Co Ltd | Injection apparatus of metallic material and injection molding method |
| CN201175762Y (en) * | 2008-03-25 | 2009-01-07 | 比亚迪股份有限公司 | Vacuum die casting device |
| CN203003118U (en) * | 2013-01-23 | 2013-06-19 | 哈尔滨理工大学 | Impulsive discharge auxiliary die-casting device |
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