CN103950206A - Method for manufacturing magnetic resonance superconducting magnet pull bar - Google Patents
Method for manufacturing magnetic resonance superconducting magnet pull bar Download PDFInfo
- Publication number
- CN103950206A CN103950206A CN201410132058.1A CN201410132058A CN103950206A CN 103950206 A CN103950206 A CN 103950206A CN 201410132058 A CN201410132058 A CN 201410132058A CN 103950206 A CN103950206 A CN 103950206A
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- Prior art keywords
- pull bar
- mould
- temperature
- fastening
- coiling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to a method for manufacturing a magnetic resonance superconducting magnet pull bar, which is a composite material prepared by respectively compositing glass fiber, carbon fiber or Kevlar fiber with epoxy resin. The method comprises the following steps: 1)pre-digging materials; 2)moulding; 3)preheating in a baking oven and procuring; 4)heating by controlling the temperature; 5)demoulding; and 6)cutting. By employing the above operation, the tensile strength of the pull bar is greater than or equal to 500MPa in a range of 4-50K, 50-300K under room temperature to low temperature, so that heat leakage is minimum, stability of a magnetic resonance imaging system is increased, the pull bar satisfies the bearing requirements for suspending a low temperature container or a cold screen in the magnetic resonance imaging system, and the usage life of the pull bar is prolonged.
Description
Technical field
The present invention relates to superconducting magnet pull bar field, specially refer to a kind of for hanging the manufacture method of the low-temperature (low temperature) vessel of superconducting magnet and the magnetic resonance load-bearing pull bar of thermal shield.
Background technology
At present, superconducting magnet is the core of magnetic resonance imaging system, in superconducting magnet, be provided with the equipment such as low-temperature (low temperature) vessel, for the normal operation of guarantee system and transport, the designing and making of pull bar is particularly important, in magnet system, the effect of pull bar is fixed magnets, liquid nitrogen container and cold screen, in the time that magnet system is normally worked, the Main Function of pull bar is for hanging load-bearing liquid nitrogen container and cold screen, in transportation, note the dynamic load power from different directions, so in order to ensure stability and the security of magnetic resonance imaging system, the pull bar of Design and manufacture should increase on intensity and pulling force, and cross-sectional area need to reach optimum width, how to produce hot strength high, and leak little the becoming of heat and need the urgent problem solving.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of manufacture method of pull bar, be coiled into racetrack by glass fibre preimpregnation cloth, carbon fiber or Kafra fiber preimpregnation cloth by inside and outside layer, by one-time formed pull bar after oven for drying, this pull bar hot strength is high and leak hot little again.
In order to solve the problems of the technologies described above, the invention provides a kind of manufacture method 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.
By epoxy-resin systems dip-coating, on fabric, described fiber is glass fibre, carbon fiber or Kafra fiber, and default a period of time section, according to prepreg type difference, is selected fabric preimpregnation mode for cloth.
Step 2: forming processes.
Different with width requirement according to pull bar length, be selected to mould difference, it is 50mm-1000mm that mould is chosen length, die width is 5mm-100mm, described mould is work section mould plate, two ends are provided with bumping post with holes, sandwiched veneer in the middle of the bumping post of both sides, and by fixture, veneer and bumping post are fixedly installed, both mold ends is also provided with cover plate, smear barrier in its gap, bumping post both sides, and at least three releasing agents of its surface spraying, every spraying in 5 minutes a time, mould is positioned in tensioner, by apparatus for baking preheated mold to 55 DEG C-65 DEG C, according to the default preimpregnation cloth of veneer width, to be wrapped on tensioner, coiling preimpregnation cloth on mould, its nexine is around glass fibre preimpregnation cloth, outer around carbon fiber or Kafra fiber preimpregnation cloth, in the time of coiling, heating preimpregnation cloth the initial segment makes it be close to die surface, both mold ends heats by heater, when coiling one circle, apply 8kg-10kg pretightning force, working pressure plate flattens and soaks material surface, in the time being wound around the second circle, strengthen 18kg-20kg pretightning force, the coiling number of turns is determined according to pull bar type of service, coiling is complete, form pull bar blank, heating preimpregnation cloth final stage flat surface, take apart a die from tensioner, cover cover plate, mould is put into clamping plate, fastening periphery.
Step 3: first baking oven preheats precuring.
Mould is arranged in heater, and design temperature is 120 DEG C-125 DEG C, after 30 minutes, takes out fastening mould, treats that temperature rises to front fastening at least 5 moulds of 125 degree, observes epoxy resin cure situation after 3 hours, after solidifying, takes out.
Step 4: second temperature control heating processing.
Open Temperature controlled heater, setting temperature controller temperature is 120 DEG C-125 DEG C, fastening mould in the time that temperature rises to 80 DEG C, a fastening mould every 15 minutes, after temperature rises to 125 DEG C, stop fastening, at 125 DEG C, keep observing and judging whether to solidify for 2.5 hours, confirm to solidify, close heater and temperature control.
Step 5: demoulding processing.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, whether consistent.
Step 6: cutting.
Steady brace, the mode that adopts cutting, certificate to cut, polish is processed into pull bar the pull bar finished product of 2mm-20mm width, after having cut, measurement size.
Preferably, the pull bar blank of moulding in described step 2 is endless track, and in manufacture process, glass fibre is warp direction and stretches.
Preferably, described pull bar bears 4K-50K low temperature and 50K-300K room temperature.
Adopt as above after technical scheme, preimpregnation cloth is wound on mould, when coiling one circle, apply 10kg pretightning force, working pressure plate flattens and soaks material surface, in winding process, need by heater heating mould two end portions, guarantee that epoxy melts and timely flat surface, after first lap, should strengthen 20kg pretightning force, after completing, coiling carries out two road heat treated, wherein adopt the baking of one heater, one-shot forming in bake process, carry out fastening mould, guarantee that resin is extruded preferably time in mobility, the epoxy resin that firmly extruding is flowed out and the resin at both mold ends circular arc position, make the interior moisture evaporation speed of pull bar blank faster, accelerate to solidify, use afterwards temperature control heating, fastening mould, fully solidify, prove by experiment: the operation of using said procedure, make pull bar at low temperature to room temperature 4-50K, 50-300K scope in-draw intensity is more than or equal to 500 MPa, and it is minimum to leak heat, improve magnetic resonance imaging system stability, meet in magnetic resonance imaging system for hanging the load-bearing requirement of low-temperature (low temperature) vessel or cold screen, extend service life.
Detailed description of the invention
Embodiment mono-.
The invention discloses a kind of manufacture method of magnetic resonance superconducting magnet pull bar, the composite that it is formed by fiber and resin compounded, the method comprises the steps.
Step 1: prepreg.
By epoxy-resin systems dip-coating, on fabric, described fiber is glass fibre and carbon fiber, and default certain hour section, according to prepreg type difference, is selected fabric preimpregnation mode for cloth.
Step 2: forming processes.
Different with width requirement according to pull bar length, be selected to mould difference, it is 50mm that mould is chosen length, die width is 5mm.
Described mould is work section mould plate, two ends are provided with bumping post with holes, sandwiched veneer in the middle of the bumping post of both sides, and by fixture, veneer and bumping post are fixedly installed, both mold ends is also provided with cover plate, smear barrier in its gap, bumping post both sides, use cleaning agent cleaning mold, cover plate and clamping plate surface, and at least three releasing agents of its surface spraying, every 5 minutes one time, the two sides of cover plate and seamed edge all will spray, mould is positioned in tensioner, by apparatus for baking preheated mold to 55 DEG C, according to the default preimpregnation cloth of veneer width, to be wrapped on tensioner, coiling preimpregnation cloth on mould, its nexine is around glass fibre preimpregnation cloth, outer around carbon fibre initial rinse fabric, in the time of coiling, heating preimpregnation cloth the initial segment makes it be close to die surface, both mold ends heats by heater, guarantee that epoxy resin melts and timely flat surface, while being wound around a circle, apply 8kg pretightning force, use veneer to flatten and soak material surface, in the time that coiling second is enclosed, strengthen 18kg pretightning force, the coiling number of turns is determined according to pull bar type of service, coiling is complete, form pull bar blank, heating preimpregnation 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, fastening periphery, clear up unnecessary resin with screwdriver.
Step 3: first baking oven preheats precuring.
Mould is arranged in heater and is toasted, design temperature is 120 DEG C, after 30 minutes, take out fastening mould, treat that temperature rises to fastening at least 5 moulds before 125 degree, guarantee that resin is extruded preferably time in mobility, observes epoxy resin cure situation after 3 hours, the epoxy resin that firmly extruding is flowed out and the resin at both mold ends circular arc position, if it is completely curing to harden, continue baking otherwise put into baking box, after solidifying, take out;
Step 4: second temperature control heating processing.
Smear heat-conducting silicone grease on heating rod after, insert veneer, use heat-preservation cotton parcel veneer, open Temperature controlled heater, setting temperature controller temperature is 120 DEG C, observes and record temperature, fastening mould in the time that temperature rises to 80 DEG C, a fastening mould every 15 minutes, after temperature rises to 125 DEG C, stop fastening, at 125 DEG C, keep 2.5 hours observe and judge whether to solidify, confirm to solidify, close heater and temperature control;
Step 5: demoulding processing.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, whether consistent.
Step 6: cutting.
Use clamp pull bar, cutting tool cuts pull bar as required, cuts into the pull bar finished product of 5mm width, after having cut, and measurement size.
The pull bar blank of moulding in described step 2 is endless track, and in manufacture process, glass fibre is warp direction and stretches, and described pull bar bears 4K low temperature and 50K room temperature.
Embodiment bis-.
Step 1: prepreg.
By epoxy-resin systems dip-coating, on fabric, described fiber is glass fibre and Kafra fiber, and default certain hour section, according to prepreg type difference, is selected fabric preimpregnation mode for cloth.
Step 2: forming processes.
Different with width requirement according to pull bar length, be selected to mould difference, it is 1000mm that mould is chosen length, die width is 100mm.
Described mould is work section mould plate, two ends are provided with bumping post with holes, sandwiched veneer in the middle of the bumping post of both sides, and by fixture, veneer and bumping post are fixedly installed, both mold ends is also provided with cover plate, smear barrier in its gap, bumping post both sides, use cleaning agent cleaning mold, cover plate and clamping plate surface, and at least three releasing agents of its surface spraying, every 5 minutes one time, the two sides of cover plate and seamed edge all will spray, mould is positioned in tensioner, before being wound around, toast preheated mold to 65 DEG C with heater, according to the default preimpregnation cloth of veneer width, to be wrapped on tensioner, coiling preimpregnation cloth on mould, its nexine is around glass fibre preimpregnation cloth, outer around Kafra fiber preimpregnation cloth, in the time of coiling, heating preimpregnation cloth the initial segment makes it be close to die surface, both mold ends heats by heater, guarantee that epoxy resin melts and timely flat surface, while being wound around a circle, apply 10kg pretightning force, use veneer to flatten and soak material surface, in the time that coiling second is enclosed, strengthen 20kg pretightning force, the coiling number of turns is determined according to pull bar type of service, coiling is complete, form pull bar blank, heating preimpregnation 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, fastening periphery, clear up unnecessary resin with screwdriver.
Step 3: first baking oven preheats precuring.
Mould is arranged in heater and is toasted, design temperature is 125 DEG C, after 30 minutes, take out fastening mould, treat that temperature rises to fastening at least 5 moulds before 125 degree, guarantee that resin is extruded preferably time in mobility, observes epoxy resin cure situation after 3 hours, the epoxy resin that firmly extruding is flowed out and the resin at both mold ends circular arc position, if it is completely curing to harden, continue baking otherwise put into baking box, after solidifying, take out.
Step 4: second temperature control heating processing.
Smear heat-conducting silicone grease on heating rod after, insert veneer, use heat-preservation cotton parcel veneer, open Temperature controlled heater, setting temperature controller temperature is 125 DEG C, observes and record temperature, fastening mould in the time that temperature rises to 80 DEG C, a fastening mould every 15 minutes, after temperature rises to 125 DEG C, stop fastening, at 125 DEG C, keep 2.5 hours observe and judge whether to solidify, confirm to solidify, close heater and temperature control.
Step 5: demoulding processing.
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, whether consistent.
Step 6: cutting.
Use clamp pull bar, cutting tool cuts pull bar as required, cuts into the pull bar finished product of 20mm width, after having cut, and measurement size.
The pull bar blank of moulding in described step 2 is endless track, and in manufacture process, glass fibre is warp direction and stretches, and described pull bar bears 50K low temperature and 300K room temperature.
Claims (3)
1. a manufacture method for magnetic resonance superconducting magnet pull bar, is characterized in that: 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;
By epoxy-resin systems dip-coating, on fabric, described fiber is glass fibre, carbon fiber or Kafra fiber, and default a period of time section, according to prepreg type difference, is selected fabric preimpregnation mode for cloth;
Step 2: forming processes;
Different with width requirement according to pull bar length, be selected to mould difference, it is 50mm-1000mm that mould is chosen length, die width is 5mm-100mm, described mould is work section mould plate, two ends are provided with bumping post with holes, sandwiched veneer in the middle of the bumping post of both sides, and by fixture, veneer and bumping post are fixedly installed, both mold ends is also provided with cover plate, smear barrier in its gap, bumping post both sides, and at least three releasing agents of its surface spraying, every spraying in 5 minutes a time, mould is positioned in tensioner, by apparatus for baking preheated mold to 55 DEG C-65 DEG C, according to the default preimpregnation cloth of veneer width, to be wrapped on tensioner, coiling preimpregnation cloth on mould, its nexine is around glass fibre preimpregnation cloth, outer around carbon fiber or Kafra fiber preimpregnation cloth, in the time of coiling, heating preimpregnation cloth the initial segment makes it be close to die surface, both mold ends heats by heater, when coiling one circle, apply 8kg-10kg pretightning force, working pressure plate flattens and soaks material surface, in the time being wound around the second circle, strengthen 18kg-20kg pretightning force, the coiling number of turns is determined according to pull bar type of service, coiling is complete, form pull bar blank, heating preimpregnation cloth final stage flat surface, take apart a die from tensioner, cover cover plate, mould is put into clamping plate, fastening periphery,
Step 3: first baking oven preheats precuring;
Mould is arranged in heater, and design temperature is 120 DEG C-125 DEG C, after 30 minutes, takes out fastening mould, treats that temperature rises to front fastening at least 5 moulds of 125 degree, observes epoxy resin cure situation after 3 hours, after solidifying, takes out;
Step 4: second temperature control heating processing;
Open Temperature controlled heater, setting temperature controller temperature is 120 DEG C-125 DEG C, fastening mould in the time that temperature rises to 80 DEG C, a fastening mould every 15 minutes, after temperature rises to 125 DEG C, stop fastening, at 125 DEG C, keep observing and judging whether to solidify for 2.5 hours, confirm to solidify, close heater and temperature control;
Step 5: demoulding processing;
After pull bar finished product, the monolateral thickness of preliminary surveying both sides, whether consistent;
Step 6: cutting;
Steady brace, the mode that adopts cutting, certificate to cut, polish is processed into pull bar the pull bar finished product of 2mm-20mm width, after having cut, measurement size.
2. the manufacture method of pull bar according to claim 1, is characterized in that: the pull bar blank of moulding in described step 2 is endless track, and in manufacture process, glass fibre is warp direction and stretches.
3. the manufacture method of pull bar according to claim 1, is characterized 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 |
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| 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 true CN103950206A (en) | 2014-07-30 |
| CN103950206B 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779032A (en) * | 2015-05-07 | 2015-07-15 | 奥泰医疗系统有限责任公司 | Pull rod structure of low-temperature container |
| 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 |
| CN108242313A (en) * | 2018-01-05 | 2018-07-03 | 中国科学院理化技术研究所 | A kind of epoxy draw ring and the mold and method for making the epoxy draw ring |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4905316A (en) * | 1986-12-22 | 1990-02-27 | Kabushiki Kaisha Toshiba | Magnetic field generating system for magnetic resonance imaging system |
| JP2008130947A (en) * | 2006-11-24 | 2008-06-05 | Hitachi Ltd | Superconducting magnet device and magnetic resonance imaging device using the same |
| CN102779605A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
| CN103065757A (en) * | 2013-01-25 | 2013-04-24 | 中国科学院电工研究所 | Breast imaging magnetic resonance imaging superconducting magnet system |
| CN103077797A (en) * | 2013-01-06 | 2013-05-01 | 中国科学院电工研究所 | Superconducting magnet system for head imaging |
-
2014
- 2014-04-03 CN CN201410132058.1A patent/CN103950206B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4905316A (en) * | 1986-12-22 | 1990-02-27 | Kabushiki Kaisha Toshiba | Magnetic field generating system for magnetic resonance imaging system |
| JP2008130947A (en) * | 2006-11-24 | 2008-06-05 | Hitachi Ltd | Superconducting magnet device and magnetic resonance imaging device using the same |
| CN102779605A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
| CN103077797A (en) * | 2013-01-06 | 2013-05-01 | 中国科学院电工研究所 | Superconducting magnet system for head imaging |
| CN103065757A (en) * | 2013-01-25 | 2013-04-24 | 中国科学院电工研究所 | Breast imaging magnetic resonance imaging superconducting magnet system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779032A (en) * | 2015-05-07 | 2015-07-15 | 奥泰医疗系统有限责任公司 | Pull rod structure of low-temperature container |
| 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 |
| CN108242313A (en) * | 2018-01-05 | 2018-07-03 | 中国科学院理化技术研究所 | A kind of epoxy draw ring and the mold and method for making the epoxy draw ring |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103950206B (en) | 2016-08-17 |
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