CN103950206B - A kind of manufacture method of magnetic resonance superconducting magnet pull bar - Google Patents
A kind of manufacture method of magnetic resonance superconducting magnet pull bar Download PDFInfo
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- CN103950206B CN103950206B CN201410132058.1A CN201410132058A CN103950206B CN 103950206 B CN103950206 B CN 103950206B CN 201410132058 A CN201410132058 A CN 201410132058A CN 103950206 B CN103950206 B CN 103950206B
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- pull bar
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- temperature
- prepreg
- magnetic resonance
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The present invention relates to the manufacture method of a kind of magnetic resonance superconducting magnet pull bar, the composite that it is composited with epoxy resin respectively by glass fibre, carbon fiber or Kafra fiber, the method comprises the steps: step 1: prepreg；Step 2: forming processes；Step 3: first baking oven preheats precuring；Step 4: second temperature control heating processes；Step 5: the demoulding processes；Step 6: cutting；Use the operation of said procedure, pull bar is made to warm to room temperature 4 50K low, in the range of 50 300K, hot strength is more than or equal to 500MPa, and leakage heat is minimum, improve magnetic resonance imaging system stability, meet in magnetic resonance imaging system for hanging low-temperature (low temperature) vessel or the load-bearing requirements of cold screen, extend service life.
Description
Technical field
The present invention relates to superconducting magnet pull bar field, be related specifically to a kind of low-temperature (low temperature) vessel for hanging superconducting magnet
And the manufacture method of the magnetic resonance load-bearing pull bar of thermal shield.
Background technology
At present, superconducting magnet is the core of magnetic resonance imaging system, is provided with the equipment such as low-temperature (low temperature) vessel in superconducting magnet, in order to
Guarantee system is properly functioning and transport, the design of pull bar and make particularly important, and in magnet system, the effect of pull bar is solid
Determine magnet, liquid nitrogen container and cold screen, when magnet system normally works, pull bar primarily serve the purpose of suspension load-bearing liquid nitrogen container and
Cold screen, in transportation, notes the dynamic load power from different directions, so in order to ensure the stability of magnetic resonance imaging system
And security, the pull bar designing and manufacturing should increase in intensity and pulling force, and cross-sectional area needs to reach optimal width
How degree, produce hot strength height and the little problem becoming the urgent solution of needs of leakage heat.
Summary of the invention
The technical problem to be solved in the present invention is to provide the manufacture method of a kind of pull bar, by glass fibre prepreg cloth, carbon
Fiber or Kafra fiber prepreg cloth are coiled into racetrack by inside and outside layer, then by one-time formed pull bar after oven for drying, should
Tie rods intensity is high and leakage heat is little.
In order to solve above-mentioned technical problem, the invention provides the manufacture method of a kind of magnetic resonance superconducting magnet pull bar, it
The composite being composited by glass fibre, carbon fiber or Kafra fiber and epoxy resin forms, and the method includes as follows
Step.
Step 1: prepreg.
By epoxy-resin systems dip-coating on fabric, described fiber is glass fibre, carbon fiber or Kafra fiber,
Preset certain time, different according to prepreg type, select fabric prepreg mode for cloth.
Step 2: forming processes.
Requiring difference according to pull bar length and width, be selected to mould different, a length of 50mm-chosen by mould
1000mm, die width is 5mm-100mm, and described mould is drum template, and two ends are provided with folder in the middle of bumping post with holes, both sides bumping post
If veneer, and by fixing device, veneer is fixedly installed with bumping post, both mold ends is additionally provided with cover plate, in its gap, bumping post both sides
Smear barrier, and at least three releasing agents of its surface spraying, sprayed one time every 5 minutes, mould is positioned over tension force dress
In putting, by apparatus for baking preheated mold to 55 DEG C-65 DEG C, preset prepreg cloth according to veneer width, will be wrapped on tensioner,
Coiling prepreg cloth on mould, its nexine around glass fibre prepreg cloth, outer layer around carbon fiber or Kafra fiber prepreg cloth, around
Heating prepreg cloth the initial segment time processed makes it be close to die surface, and both mold ends passes through heating devices heat, applies during coiling one circle
8kg-10kg pretightning force, uses pressure plare to flatten leaching material surface, when being wound around the second circle, strengthens 18kg-20kg pretightning force, coiling
Depending on the number of turns uses type according to pull bar, coiling is complete, forms pull bar blank, heats prepreg cloth final stage flat surface,
Take apart a die from tensioner, cover cover plate, mould is put into clamping plate, fasten periphery.
Step 3: first baking oven preheats precuring.
Being arranged in heater by mould, design temperature is 120 DEG C-125 DEG C, takes out fastening mould, treat after 30 minutes
Temperature fastens at least 5 moulds before rising to 125 degree, observe epoxy resin cure situation, take out after solidification after 3 hours.
Step 4: second temperature control heating processes.
Open Temperature controlled heater, set temperature controller temperature as 120 DEG C-125 DEG C, fastening mould when temperature rises to 80 DEG C,
Every 15 minutes fasten a mould, after temperature rises to 125 DEG C stop fastening, at 125 DEG C keep 2.5 hours observe and
Judge whether solidification, confirm solidification, close heater and temperature control.
Step 5: the demoulding processes.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, if consistent.
Step 6: cutting.
Steady brace, pull bar is processed into the pull bar finished product of 2mm-20mm width by the mode use cutting, evidence to cut, polishing,
After having cut, measurement size.
Preferably, in described step 2, the pull bar blank of shaping is endless track, and in the fabrication process, glass fibre is warp
Line direction stretches.
Preferably, described pull bar bears 4K-50K low temperature and 50K-300K room temperature.
Use as above after technical scheme, prepreg cloth is wound on mould, apply 10kg pretightning force during coiling one circle, use
Pressure plare flattens leaching material surface, needs to heat mould two end portions with heater, it is ensured that epoxy melts and puts down in time in winding process
Whole surface, should strengthen 20kg pretightning force after first lap, and coiling carries out two road heating after completing, wherein use and add together
The baking of thermal, one-shot forming in baking process, carry out fasten mould, it is ensured that resin mobility preferably time be extruded, use
The epoxy resin of power extruding outflow and the resin at both mold ends circular arc position so that in pull bar blank, moisture evaporation speed is faster,
Accelerate solidification, use temperature control heating afterwards, fasten mould, fully solidify, be experimentally confirmed: use the operation of said procedure,
Making pull bar at the low 4-50K that warms to room temperature, in the range of 50-300K, hot strength is more than or equal to 500 MPa, and leakage heat is minimum,
Improve magnetic resonance imaging system stability, meet in magnetic resonance imaging system for hang low-temperature (low temperature) vessel or cold screen load-bearing want
Ask, extend service life.
Detailed description of the invention
Embodiment one.
The invention discloses the manufacture method of a kind of magnetic resonance superconducting magnet pull bar, it is by fiber and resin compounded
Composite forms, and the method comprises the steps.
Step 1: prepreg.
By epoxy-resin systems dip-coating on fabric, described fiber is glass fibre and carbon fiber, presets a timing
Between section, different according to prepreg type, select fabric prepreg mode for cloth.
Step 2: forming processes.
Requiring difference according to pull bar length and width, be selected to mould different, mould chooses a length of 50mm, mould
Tool width is 5mm.
Described mould is drum template, and two ends are provided with sandwiched veneer in the middle of bumping post with holes, both sides bumping post, and by fixing dress
Putting and be fixedly installed with bumping post by veneer, both mold ends is additionally provided with cover plate, smears barrier in its gap, bumping post both sides, uses cleaning
Agent cleaning mold, cover plate and cleat surface, and at least three releasing agents of its surface spraying, every 5 minutes one time, the two of cover plate
Face and seamed edge will spray, and are positioned in tensioner by mould, by apparatus for baking preheated mold to 55 DEG C, according to veneer width
Presetting prepreg cloth, will be wrapped on tensioner, coiling prepreg cloth on mould, its nexine is around glass fibre prepreg cloth, outer layer
Around carbon fibre initial rinse fabric, heating prepreg cloth the initial segment when coiling and make it be close to die surface, both mold ends passes through heater
Heating, it is ensured that epoxy resin melts and timely flat surface, applies 8kg pretightning force when being wound around a circle, uses veneer to flatten leaching and expects
Surface, when coiling second is enclosed, strengthens 18kg pretightning force, and depending on the coiling number of turns uses type according to pull bar, coiling is complete, is formed
Pull bar blank, heating prepreg cloth final stage flat surface, use base stock protection mould, take apart a die from tensioner,
Cover cover plate, mould is put into clamping plate, fasten periphery, with the unnecessary resin of screwdriver cleaning.
Step 3: first baking oven preheats precuring.
Toasting in mould is arranged on heater, design temperature is 120 DEG C, takes out fastening mould, treat temperature after 30 minutes
Fasten at least 5 moulds before rising to 125 degree, it is ensured that resin mobility preferably time be extruded, after 3 hours observe epoxy resin
Solidification situation, the epoxy resin of firmly extruding outflow and the resin at both mold ends circular arc position, if hardening, it is fully cured, otherwise
Then put into baking box and continue baking, take out after solidification；
Step 4: second temperature control heating processes.
Insert veneer after heating rod is smeared heat-conducting silicone grease, use heat-preservation cotton parcel veneer, open Temperature controlled heater, if
Determining temperature controller temperature is 120 DEG C, observes and records temperature, fastens mould, fastened one every 15 minutes when temperature rises to 80 DEG C
Secondary mould, stops fastening after temperature rises to 125 DEG C, keeps 2.5 hours observing and judging whether solidification, confirm at 125 DEG C
Solidification, closes heater and temperature control；
Step 5: the demoulding processes.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, if consistent.
Step 6: cutting.
Using clamp pull bar, cutting tool cutting pull bar, cuts into the pull bar finished product of 5mm width as required, cutting
After completing, measurement size.
In described step 2, the pull bar blank of shaping is endless track, and in the fabrication process, glass fibre is that warp direction draws
Stretching, described pull bar bears 4K low temperature and 50K room temperature.
Embodiment two.
Step 1: prepreg.
By epoxy-resin systems dip-coating on fabric, described fiber is glass fibre and Kafra fiber composition, in advance
If certain period of time, different according to prepreg type, select fabric prepreg mode for cloth.
Step 2: forming processes.
Requiring difference according to pull bar length and width, be selected to mould different, a length of 1000mm chosen by mould,
Die width is 100mm.
Described mould is drum template, and two ends are provided with sandwiched veneer in the middle of bumping post with holes, both sides bumping post, and by fixing dress
Putting and be fixedly installed with bumping post by veneer, both mold ends is additionally provided with cover plate, smears barrier in its gap, bumping post both sides, uses cleaning
Agent cleaning mold, cover plate and cleat surface, and at least three releasing agents of its surface spraying, every 5 minutes one time, the two of cover plate
Face and seamed edge will spray, and are positioned in tensioner by mould, by heater baking preheated mold to 65 DEG C before being wound around, according to
Veneer width presets prepreg cloth, will be wrapped on tensioner, coiling prepreg cloth on mould, and its nexine presoaks around glass fibre
Cloth, outer layer, around Kafra fiber prepreg cloth, heat prepreg cloth the initial segment and make it be close to die surface when coiling, and both mold ends is led to
Cross heating devices heat, it is ensured that epoxy resin melts and timely flat surface, applies 10kg pretightning force, use list when being wound around a circle
Plate flattens leaching material surface, when coiling second is enclosed, strengthens 20kg pretightning force, depending on the coiling number of turns uses type according to pull bar, around
Make complete, form pull bar blank, heating prepreg cloth final stage flat surface, use base stock protection mould, from tensioner
On take apart a die, cover cover plate, mould put into clamping plate, fasten periphery, with the unnecessary resin of screwdriver cleaning.
Step 3: first baking oven preheats precuring.
Toasting in mould is arranged on heater, design temperature is 125 DEG C, takes out fastening mould, treat temperature after 30 minutes
Fasten at least 5 moulds before rising to 125 degree, it is ensured that resin mobility preferably time be extruded, after 3 hours observe epoxy resin
Solidification situation, the epoxy resin of firmly extruding outflow and the resin at both mold ends circular arc position, if hardening, it is fully cured, otherwise
Then put into baking box and continue baking, take out after solidification.
Step 4: second temperature control heating processes.
Insert veneer after heating rod is smeared heat-conducting silicone grease, use heat-preservation cotton parcel veneer, open Temperature controlled heater, if
Determining temperature controller temperature is 125 DEG C, observes and records temperature, fastens mould, fastened one every 15 minutes when temperature rises to 80 DEG C
Secondary mould, stops fastening after temperature rises to 125 DEG C, keeps 2.5 hours observing and judging whether solidification, confirm at 125 DEG C
Solidification, closes heater and temperature control.
Step 5: the demoulding processes.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, if consistent.
Step 6: cutting.
Using clamp pull bar, cutting tool cutting pull bar, cuts into the pull bar finished product of 20mm width as required, cutting
After completing, measurement size.
In described step 2, the pull bar blank of shaping is endless track, and in the fabrication process, glass fibre is that warp direction draws
Stretching, described pull bar bears 50K low temperature and 300K room temperature.
Claims (3)
1. the manufacture method of a magnetic resonance superconducting magnet pull bar, it is characterised in that: it is drawn by glass fibre, carbon fiber or Kev
The composite composition that fiber and epoxy resin are composited, the method comprises the steps:
Step 1: prepreg；
By epoxy-resin systems dip-coating on fabric, described fiber is glass fibre, carbon fiber or Kafra fiber, presets
Certain time, different according to prepreg type, select fabric prepreg mode for cloth；
Step 2: forming processes；
Requiring difference according to pull bar length and width, be selected to mould different, a length of 50mm-chosen by mould
1000mm, die width is 5mm-100mm, and described mould is drum template, and two ends are provided with folder in the middle of bumping post with holes, both sides bumping post
If veneer, and by fixing device, veneer is fixedly installed with bumping post, both mold ends is additionally provided with cover plate, in its gap, bumping post both sides
Smear barrier, and at least three releasing agents of its surface spraying, sprayed one time every 5 minutes, mould is positioned over tension force dress
In putting, by apparatus for baking preheated mold to 55 DEG C-65 DEG C, preset prepreg cloth according to veneer width, will be wrapped on tensioner,
Coiling prepreg cloth on mould, its nexine around glass fibre prepreg cloth, outer layer around carbon fiber or Kafra fiber prepreg cloth, around
Heating prepreg cloth the initial segment time processed makes it be close to die surface, and both mold ends passes through heating devices heat, applies during coiling one circle
8kg-10kg pretightning force, uses pressure plare to flatten leaching material surface, when being wound around the second circle, strengthens 18kg-20kg pretightning force, coiling
Depending on the number of turns uses type according to pull bar, coiling is complete, forms pull bar blank, heats prepreg cloth final stage flat surface,
Take apart a die from tensioner, cover cover plate, mould is put into clamping plate, fasten periphery；
Step 3: first baking oven preheats precuring；
Being arranged in heater by mould, design temperature is 120 DEG C-125 DEG C, takes out fastening mould, treat temperature after 30 minutes
Fasten at least 5 moulds before rising to 125 degree, observe epoxy resin cure situation after 3 hours, take out after solidification；
Step 4: second temperature control heating processes；
Open Temperature controlled heater, set temperature controller temperature as 120 DEG C-125 DEG C, fastening mould when temperature rises to 80 DEG C, every
Mould of fastening in 15 minutes, stops fastening after temperature rises to 125 DEG C, keeps 2.5 hours observing and judging at 125 DEG C
Whether solidify, confirm solidification, close heater and temperature control；
Step 5: the demoulding processes；
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, if consistent；
Step 6: cutting；
Steady brace, pull bar is processed into the pull bar finished product of 2mm-20mm width, cutting by the mode use cutting, evidence to cut, polishing
After completing, measurement size.
The manufacture method of pull bar the most according to claim 1, it is characterised in that: in described step 2, the pull bar blank of shaping is
Endless track, in the fabrication process, glass fibre is warp direction stretching.
The manufacture method of pull bar the most according to claim 1, it is characterised in that: described pull bar bears 4K-50K low temperature and 50K-
300K room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132058.1A CN103950206B (en) | 2014-04-03 | 2014-04-03 | A kind of manufacture method of magnetic resonance superconducting magnet pull bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132058.1A CN103950206B (en) | 2014-04-03 | 2014-04-03 | A kind of manufacture method of magnetic resonance superconducting magnet pull bar |
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| Publication Number | Publication Date |
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| CN103950206A CN103950206A (en) | 2014-07-30 |
| CN103950206B true CN103950206B (en) | 2016-08-17 |
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| CN201410132058.1A Active CN103950206B (en) | 2014-04-03 | 2014-04-03 | A kind of manufacture method of magnetic resonance superconducting magnet pull bar |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107053705A (en) * | 2017-03-14 | 2017-08-18 | 海宁安捷复合材料有限责任公司 | A kind of processing method of basalt fibre plate and the processing mold applied to this method |
| CN108242313B (en) * | 2018-01-05 | 2024-02-20 | 中国科学院理化技术研究所 | Epoxy pull ring, die and method for manufacturing epoxy pull ring |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0687444B2 (en) * | 1986-12-22 | 1994-11-02 | 株式会社東芝 | Magnetic resonance imager |
| JP2008130947A (en) * | 2006-11-24 | 2008-06-05 | Hitachi Ltd | Superconducting magnet device and magnetic resonance imaging device using the same |
| CN102779605B (en) * | 2011-05-12 | 2014-11-19 | 上海联影医疗科技有限公司 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
| CN103077797B (en) * | 2013-01-06 | 2016-03-30 | 中国科学院电工研究所 | For the superconducting magnet system of head imaging |
| CN103065757B (en) * | 2013-01-25 | 2015-04-22 | 中国科学院电工研究所 | Breast imaging magnetic resonance imaging superconducting magnet system |
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