CN111665466A - Roller type engraving processing method of gradient coil - Google Patents
Roller type engraving processing method of gradient coil Download PDFInfo
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- CN111665466A CN111665466A CN202010785923.8A CN202010785923A CN111665466A CN 111665466 A CN111665466 A CN 111665466A CN 202010785923 A CN202010785923 A CN 202010785923A CN 111665466 A CN111665466 A CN 111665466A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
- G01R33/3858—Manufacture and installation of gradient coils, means for providing mechanical support to parts of the gradient-coil assembly
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Abstract
The invention discloses a roller type engraving processing method of a gradient coil, which comprises the steps of sleeving an epoxy framework on a central shaft, processing the excircle of the epoxy framework, and marking a positioning reference at the end part of the epoxy framework; blanking the copper plate, and bending to obtain a copper plate winding drum; sleeving and fixing the copper plate winding drum on the epoxy framework; clamping the central shaft on a roller type numerical control engraving and milling machine, and aligning the tool on the positioning reference; and engraving the copper plate winding drum to manufacture a copper plate circuit. According to the roller type engraving processing method of the gradient coil, the copper plate winding drum is installed on the framework, and then the roller type numerical control engraving and milling machine is used for processing a circuit, so that the size of the saddle-shaped coil can be ensured to be consistent with a theoretical value.
Description
Technical Field
The invention relates to the technical field of nuclear magnetic resonance, in particular to a roller type engraving processing method of a gradient coil.
Background
Gradient coils are one of the core components of a magnetic resonance imaging system for generating gradient fields for spatial encoding.
The size of each wire is ensured to be consistent with the theoretical size during coil processing, and the coaxiality, the symmetry and the circumferential angle of the main coil and the shielding coil are ensured during installation. If there is a slight deviation, the nonlinearity and eddy current value of the gradient coil will become large, which will seriously degrade the performance of the gradient coil, or even discard it. At present, the gradient coil is manufactured and installed by the following processes: cutting a required line from the copper plate, breaking the copper plate winding drum, breaking the connection point of the copper plate, fixing the cylinder on the framework, impregnating grease and the like. There are the following disadvantages: 1. when the copper plate is wound into a drum, originally uniform cutting seams become uneven, the two sides of some cutting seams even contact to cause coil short circuit, and some copper strips tilt to cause that the drum is not a regular circle, and the coil cannot meet the design requirements, so that the linearity of a gradient field is deteriorated; 2. the connecting point is broken by adopting a handheld rotary file mode, the size of a gap at the broken point is not easy to control, the sectional area of the lead at the position is easy to be smaller than a theoretical value, the resistance of the lead is increased, and the heat productivity of the gradient coil is increased; 3. the positioning accuracy of the cylinder on the framework is not easy to control, some distortion can occur to the copper plate after the copper plate is rolled, and the cracks at the edge of the copper plate are loose, so that the accuracy of the positioning reference is reduced, the linearity of a gradient field is deteriorated, and the eddy current interference is increased.
Therefore, how to provide a roller-type engraving method for gradient coils, which ensures that the size of the coil conforms to the theoretical value, is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a roller type engraving processing method of a gradient coil.
In order to achieve the above object, the present invention provides a roll engraving method for a gradient coil, comprising,
sleeving an epoxy framework on a central shaft, machining an excircle of the epoxy framework, and marking a positioning reference at the end part of the epoxy framework;
blanking the copper plate, and bending to obtain a copper plate winding drum;
sleeving and fixing the copper plate winding drum on the epoxy framework;
clamping the central shaft on a roller type numerical control engraving and milling machine, and aligning the tool on the positioning reference;
and engraving the copper plate winding drum to manufacture a copper plate circuit.
Preferably, after the step of bending the copper plate roll, the method further comprises:
and carrying out softening annealing treatment on the copper plate winding drum.
Preferably, the blanking size of the copper plate is larger than the theoretical external size of the copper plate, and the rolling diameter of the copper plate reel is smaller than the theoretical diameter of the coil of the copper plate circuit.
Preferably, the step of fixing the copper plate reel on the skeleton shaft in a sleeving manner specifically comprises,
coating epoxy resin glue on the outer cylindrical surface of the epoxy framework;
and sleeving the copper plate winding drum on the epoxy framework, and adjusting the axial size and the circumferential angle.
Preferably, after the step of adjusting the axial dimension and the circumferential angle, the method further comprises,
the copper plate winding drum is hooped on the epoxy framework by a coil clamp;
and after the epoxy resin adhesive is cured, the coil clamp is disassembled.
Preferably, the inner diameter of the coil clamp is equal to the theoretical outer diameter of the coil of the copper plate line.
Preferably, after the step of engraving the copper plate circuit, the method further comprises,
winding glass fiber cloth on the outer side of the copper plate circuit, and coating epoxy resin glue;
and after the epoxy resin adhesive is cured, clamping the central shaft in the roller type numerical control engraving and milling machine again, and processing the excircle.
Preferably, after the step of processing the outer circle, the method further comprises,
and returning to repeat the step of blanking the copper plate, and manufacturing the shielding coil and the main coil of the copper plate circuit.
Compared with the background art, the roller type engraving processing method of the gradient coil provided by the invention comprises the following five steps: firstly, sleeving an epoxy framework on a central shaft, processing an excircle of the epoxy framework, and marking a positioning reference at the end part of the epoxy framework; secondly, blanking the copper plate, and bending to obtain a copper plate winding drum; thirdly, sleeving and fixing the copper plate winding drum on the epoxy framework; fourthly, clamping the central shaft in a roller type numerical control engraving and milling machine, and aligning the tool on a positioning reference; fifthly, engraving the copper plate winding drum to manufacture a copper plate circuit; the roller type carving processing method of the gradient coil comprises the steps that an epoxy framework and a central shaft are installed in the first step, a positioning benchmark is marked at the end part of the epoxy framework, blanking of a copper plate is achieved in the second step, a planar copper plate is bent to achieve a copper plate winding drum in a winding drum shape, then the copper plate winding drum which is bent in the third step is fixedly sleeved on the epoxy framework, the winding drum shape of the copper plate winding drum is matched with the cylindrical shape of the epoxy framework to achieve tight fitting of sleeving and fixing, the central shaft fixed with the copper plate winding drum is clamped on a roller type numerical control carving and milling machine in the fourth step, the positioning benchmark marked at the end part of the epoxy framework is used for tool setting, finally, in the fifth step, under the fixing effect of the central shaft and the epoxy framework and the processing effect of the roller type numerical control carving and milling machine, the copper plate winding drum on the epoxy framework is machined, and a copper plate, the copper plate circuit is a gradient coil and comprises two groups of saddle-shaped X coils and two groups of saddle-shaped Y coils, and the method can ensure that the size of the saddle-shaped coil is consistent with a theoretical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a roller engraving process for gradient coils according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a saddle coil configuration in a gradient coil provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the X shield coil and the Y shield coil of FIG. 2;
FIG. 4 is a schematic installation diagram of a first flow of a roll engraving process for gradient coils according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a copper plate according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the installation of a second process of a roll engraving process for gradient coils according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating the installation of a third process of a roller engraving process for gradient coils according to an embodiment of the present invention;
fig. 8 is a schematic installation diagram of a fourth flow of a roller engraving process method for gradient coils according to an embodiment of the present invention.
Wherein:
the device comprises a 1-copper plate circuit, a 3-central shaft, a 4-epoxy framework, a 5-copper plate, a 6-coil clamp, an 11-shielding coil, a 12-main coil, a 111-X shielding coil and a 112-Y shielding coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 8, in which, fig. 1 is a flow chart illustrating a roller engraving method for gradient coils according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a saddle coil in a gradient coil provided by an embodiment of the invention, fig. 3 is a schematic structural diagram of an X shield coil and a Y shield coil in fig. 2, FIG. 4 is a schematic installation diagram of a first flow of a roll engraving process for gradient coils according to an embodiment of the present invention, fig. 5 is a schematic structural view of a copper plate according to an embodiment of the present invention, fig. 6 is a schematic installation view of a second flow of a roll engraving process method for gradient coils according to an embodiment of the present invention, FIG. 7 is a schematic installation diagram of a third flow of a roller engraving process method for gradient coils according to an embodiment of the present invention, fig. 8 is a schematic installation diagram of a fourth flow of a roller engraving process method for gradient coils according to an embodiment of the present invention.
In a first specific embodiment, the method for roll engraving of gradient coils provided by the invention comprises the following steps: s1, sleeving the epoxy framework 4 on the central shaft 3, machining the excircle of the epoxy framework 4, and marking a positioning reference at the end part of the epoxy framework 4; s2, blanking the copper plate 5, and bending to form a copper plate reel; s3, sleeving and fixing the copper plate winding drum on the epoxy framework 4; s4, clamping the central shaft 3 in a roller type numerical control engraving and milling machine, and aligning the tool on a positioning reference; and S5, carving the copper plate reel to form the copper plate circuit 1.
In this embodiment, in step S1, first, the epoxy frame 4 is sleeved on the central shaft 3, the outer circle of the epoxy frame 4 is processed, then a positioning reference is marked on the end of the epoxy frame 4, and the central shaft 3 and the epoxy frame 4 are combined to form a frame shaft for the copper plate winding drum to be mounted and fixed in the subsequent steps; in step S2, the copper plate 5 used as a raw material is first blanked, the copper plate 5 is bent to form a copper plate roll, and the copper plate roll is in a roll shape, and the purpose of this step is to make the roll-shaped copper plate roll closely adhere to the bobbin; in step S3, the copper plate reel manufactured in the previous step is mounted, the bent and rolled copper plate reel can be fixed on the skeleton shaft in a sleeving manner, the roll shape of the copper plate reel is matched with the cylinder shape of the skeleton shaft, and the copper plate reel and the skeleton shaft are mounted in a surface-fitting manner to ensure tight fitting, so that the copper plate reel and the skeleton shaft form a whole, and the copper plate reel can be processed in the subsequent step; in step S4, the whole body obtained by the previous step is mounted on a roller-type numerical control engraving and milling machine, so that two ends of the skeleton shaft are clamped on the roller-type numerical control engraving and milling machine, that is, two ends of the central shaft 3 are clamped on the roller-type numerical control engraving and milling machine, and the positioning references marked in the previous step are used for tool setting, and the tool setting after each clamping adopts the same positioning reference, thereby ensuring the coincidence of the axial central planes of the saddle coils at different diameters; in step S5, on the basis that the skeleton shaft provides the installation and fixation function for the copper plate winding drum, the copper plate winding drum on the skeleton shaft is engraved by a roller type numerical control engraving and milling machine, and the copper plate winding drum is engraved into a copper plate line 1 meeting the use requirement, wherein the copper plate line 1 corresponds to two sets of saddle-shaped X coils and Y coils in the gradient coils.
In this embodiment, the gradient coils comprise two sets of saddle-shaped X-coils and Y-coils, wherein each coil is divided into the main coil 12 and the shielding coils 11 and X, Y, which have the same shape and slightly different sizes and are distributed at 90 ° intervals on the inner cylindrical surface of the gradient coil. The main coil 12 is used to generate gradient fields, and the shielding coil 11 is installed at a distance outside the main coil 12 to shield the escape fields of the main coil 12. The processing methods of the two coils are the same, the processes from the step S1 to the step S5 are repeated, the numerical control engraving machine is used for sequentially finishing the accurate processing of the circuits of the various coils, the same positioning reference is adopted for the tool setting after each clamping, and the coincidence of the axial center planes of the saddle-shaped coils at different diameters is ensured.
Compared with the processing method of the gradient coil in the prior art, the method adopts the mode that the copper plate 5 is cut and then made into the copper plate winding drum, and then the subsequent steps such as breaking of a connecting point, fixing on a framework, soaking in grease and the like are carried out; the specific operation is as follows: 1. cutting the copper plate 5 into a required line according to the coil cutting diagram, reserving a plurality of connecting points for keeping the copper plate 5 not loose and not cutting off; 2. brushing black glue on the copper plate 5, and sticking an epoxy plate to fix the copper plate 5 into a whole; 3. the copper plate 5 is wound into a roll, the diameter of the roll is slightly smaller than the theoretical diameter, and the roll can rebound; 4. the connection point is broken; 5. the sleeve is sleeved on the epoxy framework 4, the axial distance and the circumferential angle of the cylinder are adjusted to required positions, and the cylinder is hooped on the framework by using a tightening belt; 6. winding and hooping the cylinder by using a glass ribbon, and detaching the tightening belt; 7. and (5) carrying out vacuum grease dipping. 8. And repeating the steps 1-7, and sequentially manufacturing an X main coil, a Y main coil, an X shielding coil 111 and a Y shielding coil 112.
And this application makes the copper reel with the copper bending earlier, carves and follow-up step to the copper reel again, can guarantee that saddle coil's size accords with the theoretical value.
For better technical effect, after step S2, that is, after the step of bending the copper plate roll, the method further includes: carrying out softening annealing treatment on the copper plate winding drum; the copper plate 5 has internal stress after being bent into the copper plate winding drum, the appearance has the tendency of springback, the internal stress can be eliminated through softening and annealing treatment, the hardness is reduced, and the dimensional stability of the copper plate winding drum during subsequent copper plate coil manufacturing can be improved.
Illustratively, the blanking size of the copper plate 5 is larger than the theoretical outer size of the copper plate 5; in a popular way, the theoretical dimension of the copper plate 5 is the theoretical dimension actually required, and in order to ensure the reliability of the dimension of the copper plate 5 after being processed into a copper plate reel, the actual blanking dimension of the copper plate 5 is larger than the theoretical dimension so as to leave sufficient subsequent processing allowance.
Illustratively, the diameter of the circle of the copper plate reel is smaller than the theoretical diameter of the coil of the copper plate circuit 1; in the actual process, the copper plate winding drum is manufactured into the winding drum in a bending mode, and the steel plate winding drum has elasticity, so that the winding drum with the target specification is rebounded, the actual specification of the rebounded winding drum does not accord with the target specification any more, and the coiling diameter of the steel plate winding drum is specified to be smaller than the theoretical diameter of the coil of the copper plate circuit 1 so as to adapt to the change of the copper plate winding drum increased due to the rebounding of the winding drum.
On this basis, with the step of copper reel suit fixed in skeleton axle, specifically include the step: coating the epoxy resin glue on the outer cylindrical surface of the epoxy framework 4; and (4) sleeving the copper plate winding drum on the epoxy framework 4, and adjusting the axial size and the circumferential angle.
On the basis, after the step of adjusting the axial dimension and the circumferential angle, the method further comprises the following steps: the copper plate winding drum is hooped on the epoxy framework 4 by a coil clamp 6; and after the epoxy resin adhesive is cured, the coil clamp 6 is detached.
In the embodiment, the coil clamp 6 is similar to the cross-sectional shape of the epoxy framework 4, and when the coil clamp 6 is installed, the coil clamp 6 is tightly attached to the copper plate winding drum; illustratively, the inner diameter of the coil clamp 6 is equal to the theoretical outer diameter of the coil of the copper plate circuit 1, so that the requirements on the outer diameter and the cylindricity of the saddle-shaped coil are further met.
On the basis, after the step of engraving the copper plate line 1, the method further comprises the following steps: winding glass fiber cloth on the outer side of the copper plate circuit 1, and coating epoxy resin glue; after the epoxy resin adhesive is cured, the central shaft 3 is clamped in the roller type numerical control engraving and milling machine again, and the outer circle is machined.
On the basis, after the step of processing the excircle, the method also comprises the following steps: and returning to repeat the step of blanking the copper plate 5, and manufacturing the shielding coil 11 and the main coil 12 of the copper plate circuit 1.
In a specific implementation manner, the roller engraving method for gradient coils provided in this embodiment specifically includes the following steps:
sleeving an epoxy framework 4 on a central shaft 3;
processing the outer circle of the epoxy framework 4 on a roller type numerical control engraving and milling machine, and marking a positioning reference at the end part of the epoxy framework 4 to facilitate the repositioning in subsequent processing;
blanking the copper plate 5 to prepare a copper plate winding drum, wherein the actual size of the copper plate 5 is larger than the theoretical size, and the actual diameter of the copper plate winding drum is smaller than the theoretical diameter so as to offset the partial rebound after winding drum;
coating the epoxy resin glue on the outer cylindrical surface of the epoxy framework 4;
sleeving the copper plate winding drum on the epoxy framework 4, and adjusting the axial size and the circumferential angle;
a coil clamp 6 is used for hooping the copper plate winding drum on the epoxy framework 4, and the inner diameter of the coil clamp 6 is equal to the theoretical size of the gradient coil, so that the accuracy of the outer diameter of the saddle-shaped coil can be ensured;
after the epoxy resin adhesive is cured, the coil clamp 6 is removed, the central shaft 3 is clamped in a roller type numerical control engraving and milling machine, a positioning reference marked before is used for aligning a tool, and the copper plate line 1 is engraved according to a drawing;
winding glass fiber cloth on the outer side of the copper plate circuit 1, and painting epoxy resin glue again;
after the epoxy resin adhesive is cured, clamping the central shaft 3 in the roller type numerical control engraving and milling machine again, and processing the excircle;
the above steps are repeated to produce the shield coil 11 and the main coil 12 of the X coil and the Y coil.
The following disadvantages compared to the prior art: 1. when the copper plate is wound into a drum, originally uniform cutting seams become uneven, the two sides of some cutting seams even contact to cause coil short circuit, and some copper strips tilt to cause that the drum is not a regular circle, and the coil cannot meet the design requirements, so that the linearity of a gradient field is deteriorated; 2. the connecting point is broken by adopting a handheld rotary file mode, the size of a gap at the broken point is not easy to control, the sectional area of the lead at the position is easy to be smaller than a theoretical value, the resistance of the lead is increased, and the heat productivity of the gradient coil is increased; 3. the positioning accuracy of the cylinder on the framework is not easy to control, some distortion can occur to the copper plate after the copper plate is rolled, and the cracks at the edge of the copper plate are loose, so that the accuracy of the positioning reference is reduced, the linearity of a gradient field is deteriorated, and the eddy current interference is increased.
The method can accurately process the shape of the saddle-shaped coil and accurately position the spatial position of the saddle-shaped coil in the gradient coil, so that the performance of the saddle-shaped coil meets the design requirement; not only the disadvantages are overcome, but also the following advantages are achieved: 1. firstly, a copper plate winding drum is installed on an epoxy framework 4, and then a circuit is processed by using a roller type numerical control engraving and milling machine, so that the size of the saddle-shaped coil can be ensured to be consistent with a theoretical value; 2. the application of the coil clamp 6 further ensures the requirements of the outer diameter size and the cylindricity of the saddle-shaped coil; 3. the central shaft 3 is connected with the epoxy framework 4 all the time, and the same positioning reference is adopted for tool setting after each clamping, so that the coincidence of the axial center planes of the saddle-shaped coils at different diameters is ensured, the alignment of the circumferential angles of the main coil 12 and the shielding coil 11 of the same coil is ensured, and the vertical angle of the X coil and the Y coil is ensured.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The roller engraving method for gradient coils provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A roller type engraving processing method of a gradient coil is characterized by comprising the following steps,
sleeving an epoxy framework (4) on a central shaft (3), machining the excircle of the epoxy framework (4), and marking a positioning reference at the end part of the epoxy framework (4);
blanking the copper plate (5) and bending to form a copper plate winding drum;
sleeving and fixing the copper plate winding drum on the epoxy framework (4);
clamping the central shaft (3) in a roller type numerical control engraving and milling machine, and aligning the tool on the positioning reference;
and engraving the copper plate winding drum to manufacture the copper plate circuit (1).
2. The method for roll engraving of gradient coils as claimed in claim 1, wherein the step of bending the copper plate into a copper plate roll further comprises:
and carrying out softening annealing treatment on the copper plate winding drum.
3. The method for roll engraving of gradient coils according to claim 1, characterized in that the blanking size of the copper plate (5) is larger than the theoretical outer dimensions of the copper plate (5), and the rolling diameter of the copper plate roll is smaller than the coil theoretical diameter of the copper plate wire (1).
4. The method for roll engraving of gradient coils according to any one of claims 1 to 3, wherein the step of fixing the copper plate roll to the bobbin shaft in a sleeved manner comprises,
coating epoxy resin glue on the outer cylindrical surface of the epoxy framework (4);
and sleeving the copper plate winding drum on the epoxy framework (4), and adjusting the axial size and the circumferential angle.
5. The method for roll engraving of gradient coils of claim 4, wherein the step of adjusting the axial dimension and the circumferential angle is followed by further comprising,
the copper plate winding drum is hooped on the epoxy framework (4) by a coil clamp (6);
and after the epoxy resin adhesive is cured, the coil clamp (6) is detached.
6. The method for roll engraving process of gradient coils according to claim 5, characterized in that the coil holder (6) has an inner diameter dimension equal to the theoretical dimension of the outer diameter of the coil of the copper plate wire (1).
7. The method for roll engraving process of gradient coils according to claim 6, characterized in that said step of engraving a copper plate wire (1) is followed by further comprising,
winding glass fiber cloth on the outer side of the copper plate line (1), and coating epoxy resin glue;
and after the epoxy resin adhesive is cured, clamping the central shaft (3) in the roller type numerical control engraving and milling machine again, and processing the excircle.
8. The method for roll engraving of a gradient coil according to claim 7, further comprising, after the step of machining the outer circle,
and returning to repeat the step of blanking the copper plate (5) to manufacture the shielding coil (11) and the main coil (12) of the copper plate line (1).
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Denomination of invention: A roller engraving method for gradient coil Effective date of registration: 20210628 Granted publication date: 20201103 Pledgee: Weifang Branch of Bank of China Co.,Ltd. Pledgor: Shandong Aoxin Medical Technology Co.,Ltd. Registration number: Y2021980005423 |
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