CN107699662B - A method of improving die casting molded surface hardness - Google Patents
A method of improving die casting molded surface hardness Download PDFInfo
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- CN107699662B CN107699662B CN201711043327.7A CN201711043327A CN107699662B CN 107699662 B CN107699662 B CN 107699662B CN 201711043327 A CN201711043327 A CN 201711043327A CN 107699662 B CN107699662 B CN 107699662B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a kind of methods for improving die casting molded surface hardness, and type core is connected with the cathode output end of the pulse power first, an electrode is connected with the cathode output end of the pulse power；The molded surface that electrode is leaned on to plesiotype core again, to form discharging gap between electrode and the molded surface of type core pole；The pulse voltage of pulse power output makes the region for forming discharging gap on electrode and molded surface with electrode form electric discharge, and the region for forming discharging gap on the molded surface of type core with electrode is made to generate localized hyperthermia；When along the molded surface traveling electrode of type core, other regions on the molded surface of electrode and type core form lasting electric discharge and generate localized hyperthermia；After core moulding surface is cooling thermal treatment layer of the one layer of hardness between HV1050-HV1010 can be formed on surface layer.The present invention can effectively improve whose surfaces and be hit the hardness at position, to be conducive to extend the service life of die casting.
Description
Technical field
The present invention relates to aluminum alloy die-casting die manufacturing technology fields, form table more particularly, to a kind of raising die casting
The method of surface hardness.
Background technique
Aluminum alloy die-casting die generally includes the upper mold with type chamber, the lower die with type core, setting and type chamber in upper mold
Connection into cast gate, lower die is equipped with the ejecting mechanism for ejecting part.When molding, upper and lower mould molding, high temperature and pressure melts
Melt shape aluminium alloy liquid and is formed by molding cavity by entering between type chamber and type core into cast gate high speed, the aluminium alloy quilt of liquid
The part needed is shaped to after cooling system is cooling.Then upper and lower mould separates, and ejecting mechanism movement will stay on type core
Part is lifted off type core.
It is usually several in production since the surface of type core needs to bear the high speed impact of the aluminium alloy liquid of high temperature and pressure repeatedly
After thousand moulds time, phenomena such as these positions will appear cracking, recess, especially near cast gate, since the surface of type core is direct
By the impact of aluminium alloy liquid, keep above-mentioned phenomenon even more serious, to seriously affect the surface quality of product, and shortens die casting
The service life of mold.
In the prior art, people usually improve the hardness of mold cores molded surface by the following two kinds mode, with
Extend the service life of mold, reduces the maintenance load of mold in use.The first is to use quenching to type core
The heat treatment process of class its advantage is that the surface hardness of type core and the intensity of entirety can be effectively improved, but is heat-treated
Type core afterwards machines difficulty there are the later period, is easy to appear the defects of deformation, in particular, being used for formed automobile zero for some
The type core of the large die-casting mould of part, aforesaid way are less suitable.Second is hard by the surface of nitridation process raising type core
Degree, but which equally exists nitriding process complicated requirement to equipment it is high, can not as needed to type core it is specific at
Type surface is nitrogenized and nitride thickness is thin, repairs the problems such as difficult after abrasion.
Summary of the invention
It is easy to cause because hardness is not high the purpose of the present invention is to solve the whose surfaces present in aluminium alloy casting die
The problem of cracking, recess, provides a kind of method for improving die casting molded surface hardness, can be according to the shape of type core different parts
Condition effectively improves whose surfaces and is hit the hardness at position, and can be convenient to serious wear position in subsequent use process
Ground reparation, to be conducive to extend the service life of die casting.
To achieve the goals above, the invention adopts the following technical scheme: a kind of raising die casting molded surface hardness
Method, include the following steps:
A. the type core of die casting is connected with the cathode output end of the pulse power of an exportable pulse voltage；
B. an electrode is connected with the cathode output end of the pulse power；
C., electrode is leaned on to the molded surface of plesiotype core, and close to the molding of electrode on electrode and type core close to each other
Discharging gap is formed between surface；
D. the pulse voltage of pulse power output makes to form discharging gap with electrode on the molded surface of electrode and type core
Region forms electric discharge, and the region for forming discharging gap on the molded surface of type core with electrode at this time generates localized hyperthermia；
E. along the molded surface traveling electrode of type core, form other regions on the molded surface of electrode and type core
Lasting electric discharge simultaneously generates localized hyperthermia；
F. it is discharged and forms one layer of hardness in HV1050- on surface layer after the cooling of the core moulding surface of local heating
Thermal treatment layer between HV1010.
Unlike the prior art, the present invention exports the anode of the type core of die-casting forming die and a pulse power
End is connected, while the cathode output end of the pulse power being connected with an electrode.In this way, being leaned on when operator holds electrode
When the molded surface of plesiotype core, air breakdown can be made and guiding discharge by being added in the pulse voltage between type core and electrode, thus
Instantaneous high-temperature is formed on the molded surface of type core.After the molded surface of high temperature is cooling, one kind can be formed in whose surfaces
The annealing effect of part, so that the thermal treatment layer of molded surface one layer of extreme hardness of formation in type core, is effectively prevented from pressure
The type core of casting mould occurs phenomena such as cracking, recess in die cast, and then is conducive to extend the service life of die casting.
It is the molded surface of type core very small one high temperature of a regional area moment formation when especially since discharging, therefore,
This method not will lead to the rising of type core entirety problem, so as to be effectively prevented from the type core that normative heat treatment technique is easy to produce
The problem of deformation.In addition this method is post-processed in the whose surfaces for having processed the die casting that can be put into production
, therefore, the machining of type core will not be had adverse effect on.In addition, when die casting is after putting into production a period of time,
The thermal treatment layer on its surface can gradually be worn, at this point, we just can make the whose surfaces after abrasion again using identical method
One layer of thermal treatment layer of secondary formation.That is, method of the invention can repeatedly use, to greatly extend making for mold
With the service life, and without dismounting mold, it is suitble to online processing.
Preferably, in step d and step e, with an air jet pipe towards being put with electrode formation on the molded surface of type core
The region in electric gap sprays compressed air, on the one hand compressed air makes the core moulding surface fast cooling for generating localized hyperthermia,
On the other hand the molten bits for being formed in core moulding surface are blown off.
On the one hand imperceptible molten bits that the compressed air that air jet pipe sprays can be formed the molded surface of type core are blown clean,
Being carried out continuously to be conducive to discharge between electrode and molded surface, on the other hand can make to form the whose surfaces of localized hyperthermia
Cooling rapidly is conducive to improve whose surfaces heat treatment to form a kind of annealing effect of similar quenching in whose surfaces
The hardness of layer.
Preferably, first carrying out Carburization Treatment to type core before step a.
In this way, can dramatically the phosphorus content on ground hoist type core surface layer, and then be conducive to improve the thermal treatment layer being subsequently formed
Hardness.
Preferably, the amplitude of the pulse voltage is between 95V-105V.
Suitable pulse voltage is conducive to control strength of discharge, and then avoids whose surfaces appearance when forming instantaneous high-temperature
Melting phenomenon, while being conducive to extend the service life of electrode.
Preferably, the electrode includes the electrode body of rod and discharge head, the discharge head is in positive 20 face body shape, in discharge head
One of vertex be equipped with the connecting rod that axis passes through the center of discharge head, discharge head remaining vertex be embedded with by
Batching sphere made of wear-resistant ceramic, the batching sphere be higher by with its locating for the adjacent 5 regular triangular faces of apex angle, the connecting rod
It is rotatablely connected with one end of the electrode body of rod, the other end of the electrode body of rod is coated with the gripping handle of insulation, when discharge head
It, can be in the regular triangular face and type when the molded surface of the batching sphere contact-type core of three vertex in one regular triangular face
Discharging gap is formed between the molded surface of core.
Discharge head is designed to positive 20 face body by the present invention, has 20 regular triangular faces, correspondingly, the week of each apex angle
Enclosing has 5 regular triangular faces, and is embedded batching sphere in its vertex.In this way, in the molded surface of discharge head contact-type core
When, each regular triangular face can have the batching sphere positioned at three edges to separate the regular triangular face and molded surface, from
And satisfactory discharging gap can be formed, it is ensured that electric discharge is normally carried out.When the mobile gripping handle of operator, can make
It continuously rolls with the discharge head of electrode body of rod rotation connection in the molded surface of type core, at this point, completing first discharged just
Molded surface is left in triangle face, and second adjacent regular triangular face moves closer to molded surface and start to discharge.So
Circulation, can form continuous electric discharge in molded surface.Due to forming a positive and a negative between two adjacent regular triangular faces
Therefore arrangement can form the region of discharge and thermal treatment layer of a continuous elongated strip in molded surface, to can avoid weight
Multiple electric discharge is conducive to improve production efficiency.
Preferably, the inside that the electrode body of rod connect one end with discharge head is equipped with rotation cavity, the rotation cavity
Inner sidewall be spherical surface, rotation cavity in be equipped with rotation annulus, it is described rotation annulus lateral surface be with rotation cavity be adapted to
Spherical surface, rotate annulus center be tapped through hole, the connecting rod is threaded in the tapped through hole, to make to connect
Bar is rotatably connected in the rotation cavity of the electrode body of rod by rotating annulus, and the electrode body of rod is set on the end face of discharge head
There is the axis along the electrode body of rod to extend internally and penetrates through the installation slot and installation circular hole of rotation cavity, the rotation cavity
Center is located on the axis of installation circular hole, and the installation slot includes two width profiles and two length sides being parallel to each other
Face, the length side are plane, and the width profile is the cylindrical surface tangent with the inner sidewall of rotation cavity, to make to install
The cross section of slot is center symmetric figure, and the symmetrical centre for installing the cross section of slot is located at the axis of installation circular hole
On, the distance between two length sides are greater than the thickness of rotation annulus, and connection can be elastically supported by being equipped in installation circular hole
The elastic supporting member for supporting optical member of bar.
Connecting rod of the invention is connected to be formed on the rotation annulus of mating spherical surfaces with rotation cavity, to make and connecting rod
The discharge head being connected can be around the centre of sphere rotation of rotation cavity, and discharge head can also turn around the axis of connecting rod simultaneously
It is dynamic, and the elastic supporting member for supporting optical member being arranged in installation circular hole can then be such that connecting rod is resiliently positioned on the axis of installation circular hole.When
Operator hold gripping handle make discharge head close to and when against the molded surface of type core, first regular triangular face is wherein
Batching sphere on one corner is first against molded surface；Operator can slightly exert oneself to push gripping handle at this time, at this time connecting rod
The elastic force of elastic supporting member for supporting optical member can be overcome and form deflection, keep the axis formation one of the axis and the electrode body of rod of connecting rod small
Angle, until the regular triangular face three batching spheres simultaneously contact-type core molded surface.That is, operator can
By adjusting the strength of pressing gripping handle, it is ensured that regular triangular face and molded surface form fixed discharging gap.
Preferably, the elastic supporting member for supporting optical member includes the elasticity for being held snugly against in installation circular hole and having opening
Annulus, at the edge of elastic circular ring integrally provided with several elastic cleats axially extended, each elastic cleat is in elastic circular ring
Circumferencial direction be uniformly distributed, and axis inclination and flexibly stick on company of the free end of elastic cleat towards installation circular hole
On the lateral surface of extension bar.
It can ensure that in the equally distributed elastic cleat of circumferencial direction and a uniform elastic anchorage force formed to connecting rod, make
Connecting rod is located on the axis of the electrode body of rod, and since the contact surface of elastic cleat and connecting rod is minimum, is conducive to
Reduce mutual frictional force, so that it is guaranteed that the smooth rotation of discharge head.
Therefore, the invention has the following beneficial effects: can effectively improve type core table according to the situation of type core different parts
Face is hit the hardness at position, and can easily repair in subsequent use process to serious wear position, to be conducive to
Extend the service life of die casting.
Detailed description of the invention
Fig. 1 is a kind of decomposition texture schematic diagram of electrode of the present invention.
Fig. 2 is the partial sectional view of electrode.
In figure: 1, the electrode body of rod 11, rotation cavity 12, installation slot 13, installation circular hole 14, gripping handle
2, discharge head 3, connecting rod 4, batching sphere 5, rotation annulus 6, elastic supporting member for supporting optical member 61, elastic circular ring 62, elasticity
Clamp bar.
Specific embodiment
The present invention will be further described with specific embodiment with reference to the accompanying drawing.
As shown in Figure 1 and Figure 2, a method of improving die casting molded surface hardness, include the following steps:
A. connecting wire is first passed through the type core of die casting and the anode of the pulse power of an exportable pulse voltage is defeated
Outlet is connected；
B. one electrode is connected with the cathode output end of the pulse power above-mentioned by connecting wire again, it is therein
Electrode can be using overall structure made of red copper；
C. then electrode is leaned on the molded surface of plesiotype core by operator, and makes to lean on electrode and type core close to each other
The discharging gap of 0.1-0.15mm is formed between the molded surface of nearly electrode；
D. the pulse voltage of pulse power output at this time makes to be formed between electric discharge on the molded surface of electrode and type core with electrode
Air breakdown in the region of gap and form electric discharge, the region moment for forming discharging gap on the molded surface of type core with electrode produces
Raw localized hyperthermia；
E. operator along type core molded surface traveling electrode, thus its on the molded surface of electrode and type core
Lasting electric discharge is formed between its region and generates localized hyperthermia；
F. it is discharged and one layer of hardness can be formed on surface layer after the cooling of the core moulding surface of local heating and be existed
Thermal treatment layer between HV1050-HV1010.
It should be noted that the amplitude of the pulse voltage of pulse power output can ensure to discharge between 95V-105V
When type core molded surface have enough localized hyperthermias under the premise of, avoid whose surfaces from melting when forming instantaneous high-temperature
Melt phenomenon, while the loss of electrode can be reduced to the maximum extent, to be conducive to extend the service life of electrode.
For the ease of the machining of type core, the medium carbon alloy steel that 4Cr5MoSiV steel etc can be used in type core is made, at this point,
We first can carry out Carburization Treatment to type core before step a, thus the phosphorus content on significant ground hoist type core surface layer, and then it is advantageous
In the hardness for improving the thermal treatment layer being subsequently formed.
In addition, in step d and step e, with an air jet pipe towards being formed between electric discharge electrode on the molded surface of type core
The region of gap sprays compressed air, and on the one hand compressed air makes the core moulding surface fast cooling for generating localized hyperthermia, another
Aspect blows off the molten bits for being formed in core moulding surface.
On the one hand imperceptible molten bits that the compressed air that air jet pipe sprays can be formed the molded surface of type core are blown clean,
Being carried out continuously to be conducive to discharge between electrode and molded surface, on the other hand can make to form the whose surfaces of localized hyperthermia
Cooling rapidly is conducive to improve whose surfaces heat treatment to form a kind of annealing effect of similar quenching in whose surfaces
The hardness of layer.
In the range of setting can be stably maintained in order to ensure the discharging gap between electrode and the molded surface of type core,
As shown in Figure 1 and Figure 2, split type structure can also be used in electrode of the invention, specifically includes the electrode body of rod 1 and discharge head 2, electric discharge
Head is the positive 20 face body with 20 regular triangular faces, correspondingly, has 5 adjacent regular triangulars in each of which vertex
Face.A piece connecting rod 3 is set in one of vertex of discharge head, and ensures that the axis of the connecting rod passes through positive 20 face body
The center of discharge head.In discharge head, remaining vertex is then embedded batching sphere 4, and batching sphere is made of wear-resistant ceramic, batching sphere
The centre of sphere is located on the connecting line between the vertex of apex angle locating for the batching sphere and the center of connector, and batching sphere is higher by and it
5 adjacent regular triangular faces of locating apex angle.
In addition, a rotation cavity 11 is arranged in the inside in electrode body of rod one end, the inner sidewall for rotating cavity is spherical surface,
It rotates and a rotation annulus 5 is set in cavity, which includes upper and lower two equal circular end faces and be connected to two
Annular side between the edge of a circular end face, and the annular side is spherical surface compatible with rotation cavity, to make
Rotating annulus is in cydariform.In this way, annular circular ring can be in rotation cavity around the centre of sphere all-direction rotation of rotation cavity.
In addition, a tapped through hole, separate discharge head one end spiral shell in connecting rod can be arranged at the center of rotation annulus in we
Line is connected in the tapped through hole, so that connecting rod be made to be rotatably connected in the rotation cavity of the electrode body of rod by rotating annulus.
For the ease of installation, the axis along the electrode body of rod can be arranged on end face of the electrode body of rod close to discharge head and extend internally simultaneously for we
The installation slot 12 and installation circular hole 13 of perforation rotation cavity, and make axis of the center positioned at installation circular hole for rotating cavity
On.In addition, installation slot is generally rectangular shaped comprising two width profiles and two length sides, length side therein are
Plane, and two length sides are parallel to each other.Width profile is then the cylindrical surface of evagination, to make the cross section for installing slot
As centrosymmetric image, and the symmetrical centre for installing the cross section of slot is located on the axis of installation circular hole.That is,
The center line for installing slot is overlapped with the axis of installation circular hole.Further, installation slot extends towards rotation cavity, until peace
The inner sidewall for plugging the width profile and rotation cavity of slot is tangent.
When installation rotation annulus, first the thickness for rotating annulus can be put into installation card slot, until the annular of rotation annulus
Side is bonded with rotation cavity inner sidewall, and the centre of sphere of annular side is overlapped with the centre of sphere of rotation cavity at this time, we are convenient to
Rotation annulus is rotated 90 degree, reliably detent avoids it from deviating from outward in rotation cavity to make rotation annulus.Then will
Connecting rod is threaded on the tapped through hole of rotation annulus, and the rotation connection between discharge head and the electrode body of rod can be completed.
Certainly, we should make to install the thickness that the distance between two length sides of slot are greater than rotation annulus.
Finally, we can also be arranged the gripping handle 14 of an insulation on the electrode body of rod, in order to holding for operator
It holds and operates, and the elastic supporting member for supporting optical member 6 that can be elastically supported connecting rod is set in the installation circular hole of the electrode body of rod, with
Just connecting rod is made to be flexibly supported and be positioned, the axis of connecting rod and the axis of the electrode body of rod coincide at this time.Specifically, bullet
Property supporting element include one be held snugly against installation circular hole in and have opening elastic circular ring 61, at the edge of elastic circular ring
3 elastic cleats axially extended, 62,3 elastic cleats are integrally provided to be uniformly distributed in the circumferencial direction of elastic circular ring,
And the free end of elastic cleat is towards the axis inclination of installation circular hole, so that the free end of elastic cleat be made flexibly to stick on
On the lateral surface of connecting rod.
In this way, rotation annulus can be first installed in rotation cavity by we, connecting rod is then passed through into elastic circular ring, makes 3
The free end of elastic cleat flexibly sticks on the lateral surface of connecting rod, and elastic supporting member for supporting optical member at this time is located in connecting rod
On.Then connecting rod is pierced into installation circular hole, is threaded in connecting rod on the tapped through hole of rotation annulus.It then will be even
Elastic supporting member for supporting optical member on extension bar promotes in installation circular hole, and elastic circular ring is inside contracted by the extruding for installing circular hole.Work as elastic circular ring
When in into installation circular hole, it can be reliably positioned at by elasticity in installation circular hole.
When operator hold gripping handle make discharge head close to and when against the molded surface of type core, first positive three side
Batching sphere on one of corner in shape face is first against molded surface；Operator can slightly exert oneself to push gripping handle at this time,
Connecting rod can overcome the elastic force of elastic supporting member for supporting optical member and form deflection at this time, make the axis of connecting rod and the axis shape of the electrode body of rod
At a small angle, at the same time, connecting rod rotates a small angle around the axis of itself, until positive three side
Three batching spheres in shape face while the molded surface of contact-type core, are fixed to be formed between regular triangular face and molded surface
Discharging gap to complete to discharge.Then the hand-holdable gripping handle of operator keeps discharge head lateral along the molded surface of type core
Mobile, two batching spheres on first regular triangular face close to moving direction side continue to keep connecing with molded surface at this time
Touching, discharge head are overturn by rotation axis of the line of above-mentioned two batching spheres, another batching sphere is separated with molded surface, until
It is located at another batching sphere on front side of moving direction on second regular triangular face adjacent with first regular triangular face to contact
Molded surface makes second regular triangular face form discharging gap with molded surface and start to discharge.So circulation, can at
Type surface forms continuous electric discharge.Due between two regular triangular faces adjacent on the discharge head of positive 20 face body shape of the invention
Just form inversion relationship, that is to say, that second regular triangular face is the figure after first regular triangular face rotation 180 degree
Shape.It therefore, can be in the region of discharge and Re Chu of molded surface one continuous elongated strip of formation when we move discharge head
Manage layer.It when moving to the end, is being moved backward after a position can be translated up, to can avoid reignition, is being conducive to mention
High efficiency.
It is understood that the outer diameter of elastic circular ring should be greater than the internal diameter of installation circular hole, and the opening on elastic circular ring
It is sufficiently large, the outer diameter of round annulus when ensuring to inside contract is less than the internal diameter of installation circular hole.In addition, elastic cleat is preferably
The cylindrical shape of rectangle sheet or indent has to make point contact or line can be kept to contact between elastic cleat and connecting rod
Conducive to mutual frictional force is reduced, so that it is guaranteed that the smooth rotation of discharge head.
Claims (6)
1. a kind of method for improving die casting molded surface hardness, characterized in that include the following steps:
A. the type core of die casting is connected with the cathode output end of the pulse power of an exportable pulse voltage；
B. an electrode is connected with the cathode output end of the pulse power；
C., electrode is leaned on to the molded surface of plesiotype core, and close to the molded surface of electrode on electrode and type core close to each other
Between form discharging gap, the electrode includes the electrode body of rod and discharge head, and the discharge head is in positive 20 face body shape, in discharge head
One of vertex be equipped with the connecting rod that axis passes through the center of discharge head, discharge head remaining vertex be embedded with by
Batching sphere made of wear-resistant ceramic, the batching sphere be higher by with its locating for the adjacent 5 regular triangular faces of apex angle, the connecting rod
It is rotatablely connected with one end of the electrode body of rod, the other end of the electrode body of rod is coated with the gripping handle of insulation, when discharge head
It, can be in the regular triangular face and type when the molded surface of the batching sphere contact-type core of three vertex in one regular triangular face
Discharging gap is formed between the molded surface of core；
D. the pulse voltage of pulse power output makes the region for forming discharging gap on the molded surface of electrode and type core with electrode
Electric discharge is formed, the region for forming discharging gap on the molded surface of type core with electrode at this time generates localized hyperthermia；
E. along the molded surface traveling electrode of type core, other regions on the molded surface of electrode and type core is formed and are continued
Electric discharge and generate localized hyperthermia；
F. it is discharged and forms one layer of hardness in HV1050-HV1010 on surface layer after the cooling of the core moulding surface of local heating
Between thermal treatment layer.
2. a kind of method for improving die casting molded surface hardness according to claim 1, characterized in that in step d
In step e, compressed air is sprayed towards the region for forming discharging gap on the molded surface of type core with electrode with an air jet pipe,
On the one hand compressed air makes the core moulding surface fast cooling for generating localized hyperthermia, on the other hand will be formed in core moulding table
The molten bits in face blow off.
3. a kind of method for improving die casting molded surface hardness according to claim 1, characterized in that in step a
Carburization Treatment first is carried out to type core before.
4. a kind of method for improving die casting molded surface hardness according to claim 1, characterized in that the pulse
The amplitude of voltage is between 95V-105V.
5. a kind of method for improving die casting molded surface hardness according to claim 1, characterized in that the electrode
The inside that the body of rod connect one end with discharge head is equipped with rotation cavity, and the inner sidewall of the rotation cavity is spherical surface, in rotation cavity
Interior to be equipped with rotation annulus, the lateral surface of the rotation annulus is the spherical surface being adapted to rotation cavity, and the center for rotating annulus is spiral shell
Line through-hole, the connecting rod are threaded in the tapped through hole, so that connecting rod be made to be rotatably connected on by rotating annulus
In the rotation cavity of the electrode body of rod, the electrode body of rod inwardly prolongs close to the end face of discharge head equipped with the axis along the electrode body of rod
The installation slot and installation circular hole of rotation cavity are stretched and penetrate through, the center of the rotation cavity is located at the axis of installation circular hole
On, the installation slot includes two width profiles and two length sides being parallel to each other, and the length side is plane, institute
Stating width profile is the cylindrical surface tangent with the inner sidewall of rotation cavity, to make the cross section center symmetric graph for installing slot
Shape, and the symmetrical centre for installing the cross section of slot is located on the axis of installation circular hole, the distance between two length sides
Greater than the thickness of rotation annulus, the elastic supporting member for supporting optical member that can be elastically supported connecting rod is equipped in installation circular hole.
6. a kind of method for improving die casting molded surface hardness according to claim 5, characterized in that the elasticity
Supporting element includes the elastic circular ring for being held snugly against in installation circular hole and having opening, in the edge of elastic circular ring one
Ground is equipped with several elastic cleats axially extended, and each elastic cleat is uniformly distributed in the circumferencial direction of elastic circular ring, and bullet
Property clamp bar free end towards installation circular hole axis inclination and flexibly stick on connecting rod lateral surface on.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643959A (en) * | 2012-05-14 | 2012-08-22 | 北京化工大学 | Method for increasing surface hardness of steel by electric pulse treatment in medium |
| JP2014111821A (en) * | 2012-11-02 | 2014-06-19 | Oita Univ | Hardening treatment method of low alloy steel |
| WO2017105153A1 (en) * | 2015-12-18 | 2017-06-22 | 한국생산기술연구원 | Surface heat-treatment method using electronic beam |
| CN107177722A (en) * | 2017-05-19 | 2017-09-19 | 中国石油大学(华东) | A kind of preparation facilities of high-strength high hard metal material surface gradient nano structure |
-
2017
- 2017-10-30 CN CN201711043327.7A patent/CN107699662B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643959A (en) * | 2012-05-14 | 2012-08-22 | 北京化工大学 | Method for increasing surface hardness of steel by electric pulse treatment in medium |
| JP2014111821A (en) * | 2012-11-02 | 2014-06-19 | Oita Univ | Hardening treatment method of low alloy steel |
| WO2017105153A1 (en) * | 2015-12-18 | 2017-06-22 | 한국생산기술연구원 | Surface heat-treatment method using electronic beam |
| CN107177722A (en) * | 2017-05-19 | 2017-09-19 | 中国石油大学(华东) | A kind of preparation facilities of high-strength high hard metal material surface gradient nano structure |
Non-Patent Citations (1)
| Title |
|---|
| 电火花表面强化工艺在工模具中的应用;刘先兰 等;《工具技术》;20021231;第36卷(第10期);第39页左栏，第40页左栏 |
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