CN203003118U - Impulsive discharge auxiliary die-casting device - Google Patents
Impulsive discharge auxiliary die-casting device Download PDFInfo
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- CN203003118U CN203003118U CN 201320035510 CN201320035510U CN203003118U CN 203003118 U CN203003118 U CN 203003118U CN 201320035510 CN201320035510 CN 201320035510 CN 201320035510 U CN201320035510 U CN 201320035510U CN 203003118 U CN203003118 U CN 203003118U
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- mould
- auxiliary mould
- graphite
- charging aperture
- hopper
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Abstract
The utility model provides an impulsive discharge auxiliary die-casting device, relates to a discharge plasma die-casting device, and belongs to the technical field of die-casting. The impulsive discharge auxiliary die-casting device aims to resolve the problems that existing die-casting technique is high in energy consumption, manufactured material is low in density, impulsive discharge temperature and pressure in the impulsive discharge firing technique are not even, and complex parts cannot be manufactured. The impulsive discharge auxiliary die-casting device comprises a feeding rod, a hopper cover, a hopper, a graphite mould, a graphite electrode, an auxiliary mould, a mould and a guide pipe. According to the impulsive discharge auxiliary die-casting device, the graphite mould, the graphite electrode, a copper electrode and a graphite press head are added on the basis of traditional die-casting to conduct impulsive discharge, raw material is metal filing remained by processing or waste metal fragments, after the material is placed into the hopper and pushed into the graphite mould, vacuumpumping is conducted, strong impulse current is exerted to two ends to enable the material to be molten, and then the molten metal is pressed into the mould cavity to be formed. The impulsive discharge auxiliary die-casting device is mainly applied to the technical field of die-casting, and the waste raw material is utilized effectively to achieve the environment-friendly purpose.
Description
Technical field
The utility model relates to a kind of discharge plasma die casting equipment, belongs to the die-casting technique field.
Background technology
Development along with science and technology, 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 the energy savings from how, and how more to take full advantage of raw-material angle and seek new solution.Can be with the material of using if just think, the laughable tank done of aluminium for example, residual cutting swarf after processing can recycling, can successfully manage above problem.
Traditional extrusion process is to adopt molten metal to enter the die cavity after coagulation under the effect of drift to be shaped, and just needs refuse for old metal, and this will be because of its oxidation and material unaccounted-for (MUF).During die casting simultaneously, need to be incubated melt, this just needs to consume more energy, if the old metal bits directly can be melted or make semisolid die casting, can utilize to a greater extent material.The problems such as the employing traditional heating mode heats metal fillings, exists heat time heating time long, and efficient is low, and prepared material density is low, and oxidation is serious.If these metal fillings remeltings owing to having larger specific area, when heating, serious oxidation can occur, 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 also produces dc pulse voltage between powder particle except the Joule heat with hot pressed sintering and plastic deformation acceleration of sintering process, and effectively utilized the spontaneous heating effect of discharge generation between powder granule.Thereby produced the peculiar phenomenon that is conducive to heat 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 produces of contact site not, 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; Make discharge position and joule heat generating components in powder adding of the 3rd, On-Off fast-pulse, all can fast moving, and make the heating of powder can homogenising.
Yet concerning actual production, the uneven distribution of temperature during due to pulsed discharge, to be that pressure is generally single shaft unidirectional due to pulsed discharge in addition, or bidirection press, can exist like this pressure inhomogeneous, can not prepare complex-shaped parts, fetter the application of this technology, need to improve to equipment the phenomenon of temperature and pressure skewness in sample during with the elimination sintering; Need to increase its capacity multi-functional and pulse current, to satisfy the needs of preparation large scale product; Because at present apply pulse discharge is carried out being under pressure when powder sintered, the restriction of mould is difficult to prepare that some are large-scale, complex-shaped material; Need also to develop that mold materials graphite intensity than present use is higher, the better novel die material of repeat usage, with the bearing capacity that improves mould and the expense that reduces mould.
The utility model content
The purpose of this utility model is that existing die-casting technique energy consumption is high, prepared material density is low in order to solve, the inhomogeneous problem that causes preparing complex component of pulsed discharge temperature and pressure in the pulsed discharge sintering technology, and the utility model provides a kind of pulsed discharge to assist die casting equipment.
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, be provided with graphite electrode in described cavity, described graphite electrode is the slab construction with through hole, this graphite electrode can move up and down in cavity, be fixed with copper electrode on the sidewall of described auxiliary mould, 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, one end of described conduit inserts in the charging aperture of auxiliary mould, and be fixedly connected with auxiliary mould, embed on one end inwall of described conduit and be fixed with columnar graphite jig, this graphite jig along catheter shaft to length be L1, be fixed with hopper on the sidewall of conduit, 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 greater than L1, one end of described follower arm is with the graphite pressure head, the other end of follower arm is copper electrode, an end with the graphite pressure head inserts 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 that is communicated with.
Described graphite electrode is used for isolating described charging aperture and discharging opening between the charging aperture and discharging opening of auxiliary mould.
The through hole of described graphite electrode makes the charging aperture of auxiliary mould be communicated with discharging opening between the charging aperture and discharging opening of auxiliary mould.
The internal diameter of the charging aperture of described auxiliary mould is less than the internal diameter of discharging opening.
The through hole of described graphite electrode is between the charging aperture of auxiliary mould and discharging opening the time, the two ends of the through hole of the graphite electrode charging aperture with auxiliary mould respectively are relative with its discharging opening, and the internal diameter of the end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, and the internal diameter of the end that this through hole is adjacent with discharging opening is identical with the internal diameter of described discharging opening.
The utility model is to add 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 the waste metal fragment, after material is put into hopper, pushes in graphite jig, vacuumizes, and two ends apply By Impulsive Current melts material, then motlten metal is squeezed into the mold cavity moulding.
The utility model has been realized casting die energy efficient 15%～30%, can prepare complex component, and the density of material of preparation improves 2%～10%, performance is good.
Description of drawings
Fig. 1 is the structural representation of the auxiliary die casting equipment of a kind of pulsed discharge described in the utility model;
Fig. 2 is that the utility model carries out in process to heating material, the view during heating material;
Fig. 3 is that the utility model carries out after heating material, the material state schematic diagram when keeping electric current constant after material melting;
Fig. 4 is the material state schematic diagram when after the utility model will melt, material will push fixing shaping the after mould.
The specific embodiment
the specific embodiment one: present embodiment is described referring to Fig. 1, die casting equipment is assisted in the described a kind of pulsed discharge of 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 is connected for axle with hopper 3, described auxiliary mould 7 is provided with cavity 9, discharging opening 10 and charging aperture, be provided with graphite electrode 6 in described cavity 9, described graphite electrode 6 is the slab construction with through hole, this graphite electrode 6 can move up and down in cavity 9, be fixed with copper electrode 1-1 on the sidewall of described auxiliary mould 7, 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, one end of described conduit 12 inserts in the charging aperture of auxiliary mould 7, and be fixedly connected with auxiliary mould 7, embed on one end inwall of described conduit 12 and be fixed with columnar graphite jig 5, this graphite jig 5 is L1 along the axial length of conduit 12, be fixed with hopper 3 on the sidewall of conduit 12, 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 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, an end with graphite pressure head 1-2 inserts 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 that is communicated with.
The specific embodiment two: present embodiment is described referring to Fig. 1, the difference of the auxiliary die casting equipment of the described a kind of pulsed discharge of present embodiment and the specific embodiment one is, described graphite electrode 6 is used for isolating described charging aperture and discharging opening 10 between the charging aperture and discharging opening 10 of auxiliary mould 7.
The specific embodiment three: the difference of the auxiliary die casting equipment of the described a kind of pulsed discharge of present embodiment and the specific embodiment one is, the through hole of described graphite electrode 6 makes the charging aperture of auxiliary mould 7 be communicated with discharging opening 10 between the charging aperture and discharging opening 10 of auxiliary mould 7.
The specific embodiment four: the described a kind of pulsed discharge of 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 the described a kind of pulsed discharge of present embodiment and the specific embodiment three is, the two ends of the through hole of described graphite electrode 6 charging aperture with auxiliary mould 7 respectively are relative with its discharging opening 10, and the internal diameter of the end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, and the internal diameter of the end that this through hole is adjacent with discharging opening 10 is identical with the internal diameter of described discharging opening 10.
Adopt the auxiliary die casting equipment of pulsed discharge to realize the method for die casting, at first use charging aperture and the discharging opening 10 of described 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 inner chamber of the inner chamber of the cavity 9 of the die cavity of mould 8, auxiliary mould 7, its discharging opening 10, hopper 3 and conduit 12 is formed vacuumizes, and makes vacuum reach 0.1MPa～10
-2Pa, at this moment, material is arranged in the confined space that graphite pressure head 1-2, graphite jig 5 and graphite electrode 6 form;
Promote blood circulation between graphite jig 5, graphite electrode 6 and graphite pressure head 1-2 and rush electric current, add thermal material (referring to Fig. 2), after material all melts, keep electric current constant (referring to Fig. 3), after 0～10 minute, mobile graphite electrode 6 is located 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;
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.
Except exerting pressure between graphite pressure head 1-2, also applied the DC pulse discharge, the plastic deformation acceleration of sintering process that causes except Joule heat and pressurization in this process, also produce dc pulse voltage between powder particle, producing discharge under the pulse current effect between particle, 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 the 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 produces of contact site not, 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 powder rapid melting; Make discharge position and joule heat generating components in powder adding of the 3rd, On-Off fast-pulse, all can fast moving, and make the heating of powder can homogenising.Making pulse concentrate on the crystal grain junction is the characteristics that DC-pulse applies process.DC-pulse applies in process, when 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 discharge, conductive heater and pressurization comprehensive function.
In process of pulse discharge, when discharging between particle, can instantaneous generation spend to the localized hyperthermias of 10,000 degree up to several thousand, cause evaporation and fusing at particle surface; Form neck at grain contact point, because heat is delivered to particle surface from the heating center and immediately to the surrounding diffusion, 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 utility model combines die-casting technique and pulsed discharge sintering technology, utilizes pulsed discharge to make the metal fillings Fast Heating reach fusing or semi-solid state, utilizes die-casting technique with melting or semi-solid molten metal extrusion forming.Can realize twice laid like this, remaining cutting swarf after for example processing, the metal after use waits as raw material; Realize energy-saving and emission-reduction, because the efficient 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, the pulsed discharge sintering is owing to being under pressure and the restriction of mould can not prepare complex component, but utilizes die casting the stress metal compacted under after pulsed discharge can be prepared Complex Parts, and realizes producing continuously.
The structure of the auxiliary die casting equipment of a kind of pulsed discharge described in the utility model is not limited to the concrete structure that the respective embodiments described above are put down in writing, and can also be the reasonable combination of the technical characterictic put down in writing of the respective embodiments described above.
Claims (5)
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) is connected for axle with hopper (3), described auxiliary mould (7) is provided with cavity (9), discharging opening (10) and charging aperture, be provided with graphite electrode (6) in described cavity (9), described graphite electrode (6) is the slab construction with through hole, this graphite electrode (6) can move up and down in cavity (9), be fixed with copper electrode (1-1) on the sidewall of described auxiliary mould (7), 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), one end of described conduit (12) inserts in the charging aperture of auxiliary mould (7), and be fixedly connected with auxiliary mould (7), embed on one end inwall of described conduit (12) and be fixed with columnar graphite jig (5), this graphite jig (5) is L1 along the axial length of conduit (12), be fixed with hopper (3) on the sidewall of conduit (12), 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) 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), an end with graphite pressure head (1-2) inserts 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 that is 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), is used 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), makes the charging aperture of auxiliary mould (7) be 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) charging aperture with auxiliary mould (7) respectively are relative with its discharging opening (10), and the internal diameter of the end that this through hole is adjacent with charging aperture is identical with the internal diameter of described charging aperture, and the internal diameter of the end that this through hole is adjacent with discharging opening (10) is identical with the internal diameter of described discharging opening (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320035510 CN203003118U (en) | 2013-01-23 | 2013-01-23 | Impulsive discharge auxiliary die-casting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320035510 CN203003118U (en) | 2013-01-23 | 2013-01-23 | Impulsive discharge auxiliary die-casting device |
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| CN203003118U true CN203003118U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320035510 Withdrawn - After Issue CN203003118U (en) | 2013-01-23 | 2013-01-23 | Impulsive discharge auxiliary die-casting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008601A (en) * | 2013-01-23 | 2013-04-03 | 哈尔滨理工大学 | Pulse discharge auxiliary die-casting device and method |
| CN108558398A (en) * | 2018-05-08 | 2018-09-21 | 北京科技大学 | A kind of method of pulsed discharge room temperature flash sintering nano ceramic material |
-
2013
- 2013-01-23 CN CN 201320035510 patent/CN203003118U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008601A (en) * | 2013-01-23 | 2013-04-03 | 哈尔滨理工大学 | Pulse discharge auxiliary die-casting device and method |
| CN108558398A (en) * | 2018-05-08 | 2018-09-21 | 北京科技大学 | A kind of method of pulsed discharge room temperature flash sintering nano ceramic material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130619 Effective date of abandoning: 20141029 |
|
| RGAV | Abandon patent right to avoid regrant |