CN109175371A - A kind of ferromagnetic concentrator and powder bed electron beam selective melting former - Google Patents
A kind of ferromagnetic concentrator and powder bed electron beam selective melting former Download PDFInfo
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- CN109175371A CN109175371A CN201811298000.9A CN201811298000A CN109175371A CN 109175371 A CN109175371 A CN 109175371A CN 201811298000 A CN201811298000 A CN 201811298000A CN 109175371 A CN109175371 A CN 109175371A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/362—Process control of energy beam parameters for preheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/40—Radiation means
- B22F12/49—Scanners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a kind of ferromagnetic concentrator and powder bed electron beam selective melting formers, it is related to powder bed electron beam selective melting technical field, to solve the congregational rate of existing ferromagnetic concentrator as the increase of frequency leads to problems such as beam spot focusing delay and focus coil generate heat.The ferromagnetic concentrator includes at least one main coil and at least one auxiliary winding, and the main coil and the auxiliary winding are individually powered, and the electric current of main coil input is constant and current direction is constant, and the size of current of the auxiliary winding input and direction change.
Description
Technical field
The present invention relates to powder bed electron beam selective melting technical field, a kind of ferromagnetic concentrator and powder bed electricity are more particularly related to
Beamlet selective melting former.
Background technique
For metal increasing material manufacturing, powder bed electron beam selective melting (English are as follows: Electron beam selective
Melting writes a Chinese character in simplified form: EBSM) technology has a wide range of applications in biologic medical and aerospace field.Powder bed electron beam is selected
Former is melted in area, and one of core component is exactly electron gun, the electricity of traditional powder bed electron beam selective melting former
Sub- rifle electron-optical system all includes emitter, electrofocusing's device, stigmator, ferromagnetic concentrator and deflector.In large area electricity
During beamlet selective melting, it is necessary to be changed to the magnetic focusing excitation of melting range difference, to reach best focusing
Effect, and electron beam selective melting deflection speed is very fast, and present frequency reaches as high as 9000Hz, it means that magnetically focused
Frequency must also reach 9000Hz, with the increase of electron beam selective melting area, the maximum of each electro-optical device excitation
Amplitude can also improve, and certainly, The faster the better for the response frequency of each electro-optical device.
Traditional single magnetic focusing coil can be embedded in ferromagnetic class material, and by changing input current, to the magnetic field of itself
Intensity and Distribution of Magnetic Field are changed, to achieve the effect that change Electron Beam Focusing.Realize large area, high-precision, quickly
Selective melting effect, the focusing effect of traditional ferromagnetic concentrator various problems can occur with the increase of frequency, for example focus
Coil induction reactance value is big and leads to beam spot focusing delay, and focus coil fever is serious etc..
In conclusion the congregational rate of existing ferromagnetic concentrator leads to beam spot focusing delay and focusing with the increase of frequency
The problems such as coil heating.
Summary of the invention
The embodiment of the present invention provides a kind of ferromagnetic concentrator and powder bed electron beam selective melting former, existing to solve
The congregational rate of ferromagnetic concentrator lead to problems such as beam spot focusing delay and focus coil generate heat with the increase of frequency.
The embodiment of the present invention provides a kind of ferromagnetic concentrator, comprising: at least one main coil and at least one auxiliary winding；
The main coil and the auxiliary winding are individually powered, and main coil input electric current is constant and current direction
Constant, the size of current of the auxiliary winding input and direction change.
Preferably, when the quantity of the main coil be even number when, the winding mode for having 50% main coil be it is counterclockwise,
The winding mode for having 50% main coil is clockwise.
Preferably, when the quantity of the main coil is odd number, the number of the main coil with anti-clockwise windings mode
Amount than have winding mode clockwise the main coil quantity more than 1.
Preferably, the axis of the axis of the main coil and the auxiliary winding is overlapped；
And the auxiliary winding is located at the inside of the main coil, external, front, any one position in rear portion.
Preferably, when the auxiliary winding is located at the inside of the main coil, the coil outer diameter of the auxiliary winding is equal to institute
The internal diameter of main coil is stated, and the length of the auxiliary winding is equal to the length of the main coil.
Preferably, when the auxiliary winding is located at the front of the main coil, the internal diameter of the auxiliary winding is equal to the master
The internal diameter for the auxiliary winding that coil inside includes, and the axial length of the auxiliary winding is the axial length of the main coil
Between 1/3~1/2；Or
When the auxiliary winding is located at the rear portion of the main coil, the internal diameter of the auxiliary winding is equal to inside the main coil
Including the auxiliary winding internal diameter, and the axial length of the auxiliary winding be the main coil axial length 1/3~1/2
Between；Or
When the auxiliary winding is located at the outside of the main coil, the internal diameter of the auxiliary winding is equal to inside the main coil
Including the auxiliary winding internal diameter, and the axial length of the auxiliary winding be the main coil axial length 1/3~1/2
Between.
Preferably, the number of ampere turns of the main coil is 3~7 times of the number of ampere turns of the auxiliary winding.
Preferably, the number of ampere turns of the main coil nearest with forming face distance successively successively decreases trapezoidal point from top to bottom
Cloth, wherein the distance between described trapezoidal upper bottom and forming face are greater than the distance between the trapezoidal bottom and forming face；
The angle formed between the trapezoidal bottom and the trapezoidal waist is between 70-90 degree.
Preferably, the distance between end face of two adjacent main coils is the 1/5 of the main coil axial length
Between~1/2；Or
The distance between end face of two adjacent auxiliary windings be the main coil axial length 1/5~1/2 it
Between；Or
The distance between end face of two adjacent main coils and an auxiliary winding is the main coil
Between the 1/5~1/2 of axial length.
The embodiment of the invention also provides a kind of powder bed electron beam selective melting formers, which is characterized in that including appointing
Ferromagnetic concentrator described in item one by one；
When the quantity for the main coil for including in the ferromagnetic concentrator is even number, the forming of powder bed electron beam selective melting is set
It is standby to be scanned preheating and fusing by linear of Electron Beam shape of spot；Or
When the quantity for the main coil for including in the ferromagnetic concentrator is odd number, powder bed electron beam selective melting former
Preheating and fusing are scanned by circle of Electron Beam shape of spot.
The embodiment of the invention provides a kind of ferromagnetic concentrators and powder bed electron beam selective melting former, the coil to include
At least one main coil and at least one auxiliary winding, the main coil and the auxiliary winding are individually powered, and the main coil is defeated
The electric current entered is constant and current direction is constant, and the size of current of the auxiliary winding input and direction change.The present invention is implemented
The ferromagnetic concentrator that example provides is combined by multiple groups main coil and auxiliary winding, since the electric current of main coil input is constant and current direction
It is constant, it can determine that main coil generates constant high-intensity magnetic field and can be reduced magnetic field fever；Furthermore auxiliary winding can be defeated with flexible modulation
Enter current value to adjust congregational rate.It is poor that the ferromagnetic concentrator that this method provides solves Electron Beam Focusing effect from structure, deposits
In the serious problem of spherical aberration, furthermore, which is applied in powder bed electron beam selective melting former, it is determined that electricity
Beamlet beam spot scans shape, and can improve forming accuracy, so that the forming efficiency of electron beam selective melting be greatly improved.
The congregational rate of existing ferromagnetic concentrator is further solved as the increase of frequency leads to beam spot focusing delay and focus coil
The problems such as fever.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is ferromagnetic concentrator structural schematic diagram provided in an embodiment of the present invention；
Fig. 2 is Distribution of Magnetic Field schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the forming of beam spot in the prior art and scanning theory figure；
Fig. 4 is beam spot forming and scanning theory figure in the embodiment of the present invention；
Fig. 5 is that the embodiment of the present invention 1 provides ferromagnetic concentrator structural schematic diagram；
Fig. 6 is the ferromagnetic concentrator structural schematic diagram that the embodiment of the present invention 2 provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 illustratively shows ferromagnetic concentrator structural schematic diagram provided in an embodiment of the present invention, as shown in Figure 1, the magnetic
Focalizer mainly includes at least one main coil and at least one auxiliary winding.
It should be noted that ferromagnetic concentrator may include the coil cluster being made of multiple main coils and multiple auxiliary windings,
The coil cluster that a main coil and an auxiliary winding form can be only included includes to coil cluster in embodiments of the present invention
The quantity of main coil and auxiliary winding is without limitation.
In practical applications, main coil is mainly used for guaranteeing electron gun focusing effect, keep before Electron Beam Focusing with it is poly-
Defocused beam spot shape and orientation consistency, and reduce the spherical aberration in traditional focus device, auxiliary winding is primarily to realize large area
High-precision focusing effect, and reduce the fever of focalizer.
Specifically, main coil and auxiliary winding are individually powered.In embodiments of the present invention, the number of turns of main coil compared with
More, inductance value is big, in order to determine that main coil generates constant high-intensity magnetic field and high-intensity magnetic field reduces heat, so keeping main coil input
Electric current it is constant and sense of current is constant；Further, since the number of turns of auxiliary winding is fewer, inductance value is small, it is possible to
The input current value of flexible modulation auxiliary winding, and then adjustable focusing effect.It should be noted that in the embodiment of the present invention
In, auxiliary winding input electric current size and sense of current be it is adjustable, and auxiliary winding input electric current size
Specific restriction is not done with sense of current.
In practical applications, the conducting wire being arranged on main coil and auxiliary winding can choose diameter be 0.3mm to 0.8mm it
Between high temperature resistant enamel covered wire, be based on this, input current value range can be in 0-10A on each coil, it should be noted that also
It can be ensuring in the case where the ampere-turn numerical value of main coil and auxiliary winding is constant, to the number of turns and input of main coil and auxiliary winding
Current value is changed.
In embodiments of the present invention, control magnetic field is distinguished for convenience, the winding method of auxiliary winding can be uniformly set to
Coiling clockwise or coiling counterclockwise.In practical applications, it is selected in order to ensure the ferromagnetic concentrator is applied to powder bed electron beam
Area is melted in former, and the preheating of electronics beam scanning and melting method are to be scanned using Electron Beam shape of spot as linear
Preheating and fusing, it is preferable that the total quantity of main coil needs for even number, and it is inverse for needing for even number main coil to be divided into half
Hour hands coiling, the other half is coiling clockwise；Further, it is also necessary to ensure that whole main coils are passed through sense of current and electric current
Size is consistent.
In practical applications, in order to ensure ferromagnetic concentrator to be applied in powder bed electron beam selective melting former, and
The preheating of electronics beam scanning and melting method are that preheating and fusing are scanned by circle of Electron Beam shape of spot, it is preferable that main
The total quantity of coil needs for odd number, and the quantity of the main coil with coiling counterclockwise is than with winding mode clockwise
The quantity of main coil is 1 more, further, it is also necessary to ensure that whole main coils are passed through sense of current and size of current is uniform
It causes.
When main coil and auxiliary winding are installed, therefore, to assure that the axis of the coil cluster of main coil and auxiliary winding composition
Always it is overlapped, i.e. the axis of main coil and the axis of auxiliary winding is overlapped.
Specifically, when auxiliary winding is integrally located at the inside of main coil, the coil outer diameter of auxiliary winding is equal to the interior of main coil
Diameter, and the length of auxiliary winding is equal to the length of main coil；When auxiliary winding is located at the front of main coil, the internal diameter of auxiliary winding is equal to
The internal diameter for the auxiliary winding for including inside main coil, and the axial length of auxiliary winding be the axial length of main coil 1/3~1/2 it
Between；When auxiliary winding is located at the rear portion of main coil, the internal diameter of auxiliary winding is equal to the internal diameter for the auxiliary winding for including inside main coil, and
The axial length of auxiliary winding is between the 1/3~1/2 of the axial length of main coil；When auxiliary winding is located at the outside of main coil,
The internal diameter of auxiliary winding is equal to the internal diameter for the auxiliary winding for including inside main coil, and the axial length of auxiliary winding is the axial direction of main coil
Between the 1/3~1/2 of length.
In embodiments of the present invention, include at least one main coil and at least one auxiliary winding in coil cluster, work as coil
When in cluster including two adjacent main coils, the distance between end face of main coil is the 1/5~1/2 of main coil axial length
Between；When including two adjacent auxiliary windings in coil cluster, the distance between end face of auxiliary winding is that main coil is axially long
Between the 1/5~1/2 of degree；When in coil cluster including two adjacent main coils and an auxiliary winding, main coil and
The distance between end face of auxiliary winding is between the 1/5~1/2 of main coil axial length.
In embodiments of the present invention, guarantee that each main coil and the number of ampere turns of each auxiliary winding are consistent, and at least one
The number of ampere turns of a main coil is 3~7 times of the number of ampere turns of at least one auxiliary winding.
As shown in Figure 1, in figure the number of turns of main coil be respectively be 900-1500 circle, the number of turns of all auxiliary windings is respectively 100-
350 circles, conducting wire are the high temperature resistant enamel covered wire of diameter 0.6mm.Diameter D is 30-60mm in Fig. 1, in order to enable two neighboring line
The magnetic field influence of circle is smaller, so determining that the distance of two neighboring coil is D/3, a height of 1.25D of main coil 1, auxiliary winding
A height of 0.5D.
In practical applications, electron beam is when perpendicular end surface is down through first end face in magnetic focusing coil, electron beam
Due to the effect by uneven distribution magnetic field, spiral advance integrally will do it, and electronic beam radius can be gradually reduced, when
When electron beam is pierced by another end face, the non-uniform magnetic field of magnetic focusing coil end face can make electron beam have lesser drag effect,
In embodiments of the present invention, in order to enhance the focusing effect of magnetic focusing coil, so by whole coil the number of turns of magnetic focusing coil
Distribution carries out trapezoidal distribution as shown in Figure 1, i.e. forming number of ampere turns of the identity distance from nearest main coil successively successively decreases from top to bottom
Trapezoidal distribution, wherein the distance between trapezoidal upper bottom and forming face are greater than the distance between trapezoidal bottom and forming face；
The embodiment of the present invention this, for the angle formed between trapezoidal bottom and trapezoidal waist between 70-90 degree or so, Fig. 1 is this hair
The preferred embodiment that bright embodiment provides, i.e., the angle formed between trapezoidal bottom and trapezoidal waist is 85 degree.
The embodiment of the invention also provides a kind of powder bed electron beam selective melting former, which includes above-mentioned retouch
The ferromagnetic concentrator stated.
Conditional electronic rifle ferromagnetic concentrator and other critical components limit powder bed electron beam due to the deficiency of coil itself
The forming area of selective melting, so the production for high-volume part, the quantity processed every time can all be limited, in addition,
For Investigation of Large Area Electron Beam selective melting forming technique, the sewwp beam spot shape of electron beam should become into a line, rather than pass
The sewwp beam spot of one point of system.The focalizer provided through the embodiment of the present invention, since focalizer includes right-handed screw and inverse spiral shell
Two kinds of focusing effects are revolved, ensure that beam spot shape of the electron beam before focusing, specific beam spot shape can pass through stigmator
It realizes, and the selection to beam spot position after focusing, it can be determined by specific requirements, in the embodiment of the present invention, it is determined that
Electron beam spot scans shape, and can improve forming accuracy, so that the forming effect of electron beam selective melting be greatly improved
Rate.
Specifically, in powder bed electron beam selective melting former provided in an embodiment of the present invention, when being wrapped in ferromagnetic concentrator
The quantity of the main coil included be even number when, powder bed electron beam selective melting former using Electron Beam shape of spot as linear into
Row scanning preheating and fusing；When the quantity for the main coil for including in ferromagnetic concentrator be odd number when, powder bed electron beam selective melting at
Shape equipment is scanned preheating and fusing by circle of Electron Beam shape of spot.
In Fig. 1 when the winding mode of two main coils, size of current are consistent with current direction, Distribution of Magnetic Field such as Fig. 2
Shown, Fig. 2 is Distribution of Magnetic Field schematic diagram provided in an embodiment of the present invention, as shown in Figure 2, when the coiling side of two main coils
When formula, size of current are consistent with current direction, this distribution that magnetic field is formed, it is ensured that rotation when electron beam is threadingly advanced
The characteristics of adjustability in direction, finally achievable beam spot rotation angle is zero.
Fig. 3 be in the prior art beam spot forming and scanning theory figure, Fig. 4 be the embodiment of the present invention in beam spot at
Shape and scanning theory figure.In the prior art, the direction of harness shape when beam spot enters magnetic focusing coil as shown in a in Fig. 3,
Then certain angle generally can be will form as shown in b in Fig. 3 by the shape after two magnetic focusing coils between a and b in Fig. 3.
In embodiments of the present invention, in order to ensure the direction of the object of beam spot and the direction of picture are consistent to improve electronics beam shaping
Efficiency, thus determine winding mode one of two main lines be it is counterclockwise, another be it is clockwise, when input coil electric current side
To on the contrary, and the size of electric current is 2 ampere-hours, if a in the direction of harness shape when beam spot enters magnetic focusing coil such as Fig. 4
It is shown, then it can generally be formed between b in a and Fig. 4 in Fig. 4 as shown in b in Fig. 4 by the shape after two magnetic focusing coils
Angle is close to 0 degree.In embodiments of the present invention, when the angle between a and b in Fig. 4 is 0, so that it may pass through line scanning side
Formula preheats electron beam powder bed, is scanned, and not only substantially increases production efficiency, but also increase processing technology mode.
In practical applications, Investigation of Large Area Electron Beam selective melting, since the image distance of electron beam is becoming always, so needing not
The magnetic field strength of the change coil stopped is quickly focused, institute with reaching best focusing effect in order to reduce coil heating and realize
It is changed with the current value only to auxiliary focus coil, change frequency can reach 9000HZ.And Investigation of Large Area Electron Beam constituency
The preheating of fusing and fusing scanning strategy need to be become line by point, in this way to improve preheating and melting rate and to forming bottom plate
Lasting heat preservation.
In embodiments of the present invention, in order to reduce the distance of focalizer vertical axial and keep realize focus before beam spot shape
Fig. 1 can be carried out structure optimization by shape function.In practical applications, can according to different requirements, to the vertical dimension of focalizer into
Row change, in order to meet the needs of various electron guns, in embodiments of the present invention, additionally provides two embodiments, respectively Fig. 5
Shown in ferromagnetic concentrator structural schematic diagram in ferromagnetic concentrator structural schematic diagram and embodiment shown in fig. 62 in embodiment 1.
Specifically, the function for the ferromagnetic concentrator that Fig. 1 is provided equally can be achieved in the ferromagnetic concentrator provided in Fig. 5, but in Fig. 5
Change frequency, that is, speed of ferromagnetic concentrator can decrease, while the size of focalizer entirety can be reduced, so that magnetic
The structure of focalizer is relatively easy compared with the structure that Fig. 1 is provided；The magnetic that Fig. 1 is provided equally can be achieved in the ferromagnetic concentrator provided in Fig. 6
The function of focalizer, but change frequency, that is, speed of the ferromagnetic concentrator in Fig. 6 can reduce more, while can reduce focusing
The overall dimensions of device, so that the structure of ferromagnetic concentrator is simpler, it should be noted that the ferromagnetic concentrator that Fig. 6 is provided only has
Reduce the function of electron beam spherical aberration.
In conclusion the embodiment of the invention provides a kind of ferromagnetic concentrator and powder bed electron beam selective melting former,
Ferromagnetic concentrator provided in an embodiment of the present invention is combined by multiple groups main coil and auxiliary winding, due to main coil input electric current it is constant with
And current direction is constant, can determine that main coil generates constant high-intensity magnetic field and can be reduced magnetic field fever；Furthermore auxiliary winding can be with
Flexible modulation input current value adjusts congregational rate.The ferromagnetic concentrator that this method provides solves Electron Beam Focusing from structure
Effect is poor, there is a problem of that spherical aberration is serious, furthermore, which is applied to powder bed electron beam selective melting former
In, it is determined that electron beam spot scans shape, and can improve forming accuracy, so that electron beam selective melting be greatly improved
Forming efficiency.The congregational rate of existing ferromagnetic concentrator is further solved as the increase of frequency leads to beam spot focusing delay
The problems such as with focus coil fever.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of ferromagnetic concentrator characterized by comprising at least one main coil and at least one auxiliary winding；
The main coil and the auxiliary winding are individually powered, and main coil input electric current is constant and current direction not
Become, the size of current of the auxiliary winding input and direction change.
2. ferromagnetic concentrator as described in claim 1, which is characterized in that when the quantity of the main coil is even number, there is 50%
The winding mode of the main coil be it is counterclockwise, it is clockwise for having the winding mode of 50% main coil.
3. ferromagnetic concentrator as described in claim 1, which is characterized in that when the quantity of the main coil is odd number, have inverse
The quantity of the main coil of hour hands winding mode than the main coil with winding mode clockwise quantity more than 1.
4. ferromagnetic concentrator as described in claim 1, which is characterized in that the axis of the axis of the main coil and the auxiliary winding
It is overlapped；
And the auxiliary winding is located at the inside of the main coil, external, front, any one position in rear portion.
5. ferromagnetic concentrator as claimed in claim 4, which is characterized in that when the auxiliary winding is located at the inside of the main coil
When, the coil outer diameter of the auxiliary winding is equal to the internal diameter of the main coil, and the length of the auxiliary winding is equal to the main coil
Length.
6. ferromagnetic concentrator as claimed in claim 4, which is characterized in that when the auxiliary winding is located at the front of the main coil
When, the internal diameter of the auxiliary winding is equal to the internal diameter for the auxiliary winding for including inside the main coil, and the axis of the auxiliary winding
To between the 1/3~1/2 of the axial length that length is the main coil；Or
When the auxiliary winding is located at the rear portion of the main coil, the internal diameter of the auxiliary winding, which is equal to inside the main coil, includes
The auxiliary winding internal diameter, and the axial length of the auxiliary winding be the main coil axial length 1/3~1/2 it
Between；Or
When the auxiliary winding is located at the outside of the main coil, the internal diameter of the auxiliary winding, which is equal to inside the main coil, includes
The auxiliary winding internal diameter, and the axial length of the auxiliary winding be the main coil axial length 1/3~1/2 it
Between.
7. ferromagnetic concentrator as described in claim 1, which is characterized in that the number of ampere turns of the main coil is the peace of the auxiliary winding
3~7 times of the number of turns.
8. ferromagnetic concentrator as described in claim 1, which is characterized in that the ampere-turn of the nearest main coil with forming face distance
Count trapezoidal distribution of successively successively decreasing from top to bottom, wherein the distance between described trapezoidal upper bottom and forming face are greater than the ladder
The distance between the bottom of shape and forming face；The angle formed between the trapezoidal bottom and the trapezoidal waist is between 70-
90 degree.
9. ferromagnetic concentrator as described in claim 1, which is characterized in that between the end face of two adjacent main coils away from
From between 1/5~1/2 for the main coil axial length；Or
The distance between end face of two adjacent auxiliary windings is between the 1/5~1/2 of the main coil axial length；Or
Person
The distance between end face of two adjacent main coils and an auxiliary winding be the main coil axis to
Between the 1/5~1/2 of length.
10. a kind of powder bed electron beam selective melting former, which is characterized in that described in claim 1~8 any one
Ferromagnetic concentrator；
When the quantity for the main coil for including in the ferromagnetic concentrator is even number, powder bed electron beam selective melting former is with electricity
Beamlet beam spot shape is that linear is scanned preheating and fusing；Or
When the quantity for the main coil for including in the ferromagnetic concentrator is odd number, powder bed electron beam selective melting former is with electricity
Beamlet beam spot shape is that circle is scanned preheating and fusing.
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