CN111736102B - Spherical frame of nuclear magnetic resonance equipment, transportation tool and production process - Google Patents
Spherical frame of nuclear magnetic resonance equipment, transportation tool and production process Download PDFInfo
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- CN111736102B CN111736102B CN202010640186.2A CN202010640186A CN111736102B CN 111736102 B CN111736102 B CN 111736102B CN 202010640186 A CN202010640186 A CN 202010640186A CN 111736102 B CN111736102 B CN 111736102B
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- spherical
- magnetic resonance
- nuclear magnetic
- resonance equipment
- shell
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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
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G35/00—Mechanical conveyors not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/22—Devices influencing the relative position or the attitude of articles during transit by conveyors
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention provides a spherical frame of nuclear magnetic resonance equipment, which belongs to the technical field of cast products and comprises a hemispherical shell, wherein a flange is arranged on the end face of the shell, a plurality of first arc plates are distributed on the spherical surface of the shell in a longitudinal line, a plurality of second arc plates are distributed on the spherical surface of the shell in a latitudinal line, the spherical surface of the shell is divided into a plurality of areas by the plurality of first arc plates and the plurality of second arc plates, conformal through holes are formed in the plurality of areas, a reinforcing rib arranged along the length direction of the outer side face of the first arc plate is arranged on the outer side face of the first arc plate, a connecting sleeve extending to the outer side of the shell is formed on the spherical surface, and the spherical center of the shell is positioned on the axis of the connecting sleeve. The invention provides a transportation tool for a nuclear magnetic resonance equipment spherical frame and a production process for the nuclear magnetic resonance equipment spherical frame. The spherical frame of nuclear magnetic resonance equipment reduces the manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of cast products, and particularly relates to a spherical frame of nuclear magnetic resonance equipment, a transportation tool and a production process.
Background
The spherical frame of nuclear magnetic resonance equipment adopts the cast piece of ductile iron material, and various detection device and auxiliary device mainly rely on the main support body to install, and this just needs the main support body to possess certain intensity. At present, the spherical frame of the conventional nuclear magnetic resonance equipment is usually manufactured into a solid structure by using a main frame body, or the thickness of the main frame body is increased, or the structural strength of the main frame body is improved by additionally arranging excessive reinforcing ribs or reinforcing ribs on the main frame body, and the weight of the main frame body is increased by the method, so that the manufacturing cost is improved.
Disclosure of Invention
The invention aims to provide a spherical frame of nuclear magnetic resonance equipment, which aims to solve the problem that in order to improve the structural strength of a main frame body, the main frame body is made into a solid structure, or the thickness of the main frame body is increased, or the main frame body is additionally provided with excessive reinforcing ribs or reinforcing ribs, and the like, so that the manufacturing cost is increased.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a nuclear magnetic resonance equipment spherical frame, including being hemispherical casing, the terminal surface of casing is equipped with the flange, the spherical of casing is personally submitted longitude line and is distributed has a plurality of first arcs, the spherical of casing is personally submitted latitude line and is distributed has a plurality of second arcs, a plurality of first arcs with a plurality of second arcs will the spherical is separated and is a plurality of regions, a plurality of follow-up through-hole has all been seted up in the region, the lateral surface of first arcs is equipped with the strengthening rib that sets up along its length direction, set up on the spherical to the adapter sleeve that the casing outside extends, the sphere center of casing is located on the axis of adapter sleeve.
The spherical frame of nuclear magnetic resonance equipment provided by the invention has the beneficial effects that: compared with the prior art, the spherical frame of the nuclear magnetic resonance equipment is characterized in that the connecting sleeve is arranged on the spherical surface of the spherical frame, the spherical frame is formed into a spherical frame body structure by the plurality of first arc plates distributed in longitudinal lines and the plurality of second arc plates distributed in latitudinal lines, the outer side surface of the first arc plates is provided with the reinforcing ribs arranged along the length direction of the first arc plates, the spherical surface is divided into a plurality of areas by the plurality of first arc plates and the plurality of second arc plates, and the plurality of areas are provided with the conformal through holes, so that the weight of the spherical frame of the nuclear magnetic resonance equipment can be effectively reduced while the structural strength is ensured, and the manufacturing cost of the spherical frame is reduced.
The invention also provides a spherical frame for transporting nuclear magnetic resonance equipment, which comprises a support bracket and a longitudinal support frame, wherein the longitudinal support frame is fixedly arranged on one side of the support bracket, an inclined support frame is arranged between the longitudinal support frame and the support bracket, a first clamping groove which is transversely arranged is formed in the longitudinal support frame, a second clamping groove which is transversely arranged is formed in the inclined support frame, the first clamping groove and the second clamping groove are used for clamping the reinforcing rib, a plurality of positioning blocks are arranged on the upper end face of the support bracket, and the positioning blocks are arranged at intervals and are circumferentially distributed and used for clamping the connecting sleeve in the connecting sleeve.
As another embodiment of the application, the first clamping groove and the second clamping groove are internally provided with a first elastic cushion layer, and one side of the first elastic cushion layer, which is used for being in contact with the reinforcing rib, is provided with an arc-shaped concave surface.
As another embodiment of the application, a second elastic cushion layer is arranged on the inner side surface of the positioning block, and a cushion block is arranged at the lower part of one side, which is used for being contacted with the connecting sleeve, of the second elastic cushion layer.
The nuclear magnetic resonance equipment spherical frame transportation tool provided by the invention has the beneficial effects that: compared with the prior art, the nuclear magnetic resonance equipment spherical frame transportation tool has the advantages that the connecting sleeve of the spherical frame is vertically arranged on the upper end face of the supporting frame, the connecting sleeve is clamped in the plurality of positioning blocks, meanwhile, the reinforcing ribs on the spherical face of the spherical frame are respectively clamped in the first clamping groove and the second clamping groove, the stability of the spherical frame of the nuclear magnetic resonance equipment can be ensured by utilizing the plurality of clamping structures, and the problem of collision and scratch caused by shaking in the transportation process of the spherical frame of the nuclear magnetic resonance equipment is avoided.
The invention also provides a production process for producing the nuclear magnetic resonance equipment spherical frame, which comprises the following steps of:
s1: modeling: arranging a whole circle of cross runners along the outer ring of the end face by taking the end face of the shell as a parting surface, arranging straight runners on opposite sides of the cross runners respectively, arranging a plurality of inner runners at intervals on the inner sides of the cross runners, arranging a plurality of top dead heads on the top of the shell, arranging exhaust channels at the junction of a first arc plate and a second arc plate and the upper end of a connecting sleeve, and burying chill at the lower part of the flange circumference, the lower part of the connecting sleeve circumference and the lower part of the junction of a plurality of first arc plates;
s2: smelting: smelting ductile iron made of A536Q material by using an electric furnace, discharging at 1500-1540 ℃, and performing spheroidizing inoculation by adopting a stream inoculation mode;
s3: pouring: adopting a double-leakage-ladle casting mode to cast simultaneously from two straight pouring gates, wherein the casting time is not more than 15min, and simultaneously casting at least two groups of test blocks in the same furnace;
s4: cleaning: adopting a shake box for shakeout, then sequentially completing the removal of a pouring system and primary shot blasting treatment on the blank, and carrying out nondestructive detection and dimension measurement;
s5: and (3) heat treatment: and (3) placing the blank and the test block in a heat treatment furnace at the same time, heating to 550-580 ℃, preserving heat for 3-5h, cooling to 200 ℃ in the furnace, and then air-cooling to room temperature.
In step S1, the intervals between the chill at the lower part of the flange circumference and the chill at the lower part of the connecting sleeve circumference are 5-10 cm, the chills at the junction of the plurality of first arc plates are arranged in a matrix, the intervals are 5-10 cm, and chromite sand is pre-buried between the chills.
As another embodiment of the application, after step S2, the liquid surface is penetrated by a preheated stirring bar to be more than 400mm, and the stirring is carried out for at least 10 circles in the same direction.
As another embodiment of the present application, after step S5, the secondary shot blasting is performed, and the diameter of the shot of the secondary shot blasting is smaller than that of the primary shot blasting.
The nuclear magnetic resonance equipment spherical frame production process provided by the invention has the beneficial effects that: compared with the prior art, the production process of the spherical frame of the nuclear magnetic resonance equipment has the advantages that the end face of the shell is taken as a parting surface, the transverse pouring gate of the whole circle is arranged along the outer ring of the end face, the straight pouring gate is respectively arranged on the opposite sides of the transverse pouring gate, the inner sides of the transverse pouring gate are provided with a plurality of inner pouring gates at intervals, the top of the shell is provided with a plurality of top dead heads, the junction of the first arc-shaped plate and the second arc-shaped plate and the upper end of the connecting sleeve are provided with exhaust channels, and chill is buried at the lower part of the flange circumference, the lower part of the connecting sleeve circumference and the lower part of the junction of the plurality of first arc-shaped plates; and smelting the ductile iron made of the A536Q material by using an electric furnace, wherein the tapping temperature is 1500-1540 ℃, and performing spheroidizing inoculation treatment by adopting a stream inoculation mode. Adopting a double-leakage-ladle casting mode to cast simultaneously from two straight pouring gates, wherein the casting time is not more than 15min, and simultaneously casting at least two groups of test blocks in the same furnace; adopting a shake box for shakeout, then sequentially completing the removal of a pouring system and primary shot blasting treatment on the blank, and carrying out nondestructive detection and dimension measurement; through laying two sprue, whole circle cross gate and a plurality of ingate, under the reasonable prerequisite of guaranteeing to smelt, promoted the speed of pouring to lay cap mouth, exhaust passage and chill, guarantee the compactness of the inside tissue of product, through subsequent clearance and heat treatment technology, obtain the spherical frame product that the quality satisfies the requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a state diagram of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention placed on a transportation tool;
fig. 2 is a schematic structural diagram of a first clamping groove and a first elastic cushion of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
fig. 4 is a schematic structural diagram of a second clamping groove and a second elastic cushion of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a modeling process in a production process of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention;
fig. 6 is a second schematic structural diagram of a modeling process set in a production process of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention;
fig. 7 is a heat treatment process diagram of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention;
fig. 8 is a golden phase diagram of a spherical frame of a nuclear magnetic resonance apparatus according to an embodiment of the present invention.
In the figure: 1. a housing; 2. a flange; 3. a first arcuate plate; 4. a second arcuate plate; 5. a conformal through hole; 6. reinforcing ribs; 7. connecting sleeves; 8. a support bracket; 9. a longitudinal support; 10. a tilting support; 11. a first clamping groove; 12. a second clamping groove; 13. a positioning block; 14. a first elastic cushion; 15. an arc-shaped concave surface; 16. a second elastic cushion; 17. and (5) cushion blocks.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a description will now be given of a spherical frame of a nuclear magnetic resonance apparatus according to the present invention. The spherical frame of nuclear magnetic resonance equipment comprises a hemispherical shell 1, a flange 2 is arranged on the end face of the shell 1, a plurality of first arc plates 3 are distributed on the spherical surface of the shell 1 in a longitudinal line mode, a plurality of second arc plates 4 are distributed on the spherical surface of the shell 1 in a longitudinal line mode, the spherical surfaces of the first arc plates 3 and the second arc plates 4 are divided into a plurality of areas, through holes 5 are formed in the areas along with the shape, reinforcing ribs 6 are arranged on the outer side face of the first arc plates 3 along with the length direction of the reinforcing ribs, connecting sleeves 7 extending to the outer side of the shell 1 are arranged on the spherical surfaces, and the spherical center of the shell 1 is located on the axis of each connecting sleeve 7.
Compared with the prior art, the spherical frame of nuclear magnetic resonance equipment provided by the invention is provided with the connecting sleeve 7 on the spherical surface, the spherical frame is formed into a spherical frame body structure by the plurality of first arc plates 3 distributed in longitudinal lines and the plurality of second arc plates 4 distributed in latitudinal lines, meanwhile, the outer side surface of the first arc plates 3 is provided with the reinforcing ribs 6 arranged along the length direction of the first arc plates, the spherical surface is divided into a plurality of areas by the plurality of first arc plates 3 and the plurality of second arc plates 4, the plurality of areas are provided with the conformal through holes 5, the weight of the spherical frame of nuclear magnetic resonance equipment can be effectively reduced while the structural strength is ensured, and the manufacturing cost of the spherical frame is reduced.
The spherical frame is an integrally cast product, annular assembly grooves are formed in the side wall of the flange 2 at the end part of the shell 1 and the side wall of the connecting sleeve 7, and threaded mounting holes are formed in the end part of the flange 2. The intersection of the first arc plates 3 is an arc-shaped integral panel, so that the structural strength of the spherical frame is improved, in addition, the second arc plates 4 are concentrated in the middle of the spherical surface, no intersection exists at the intersection of the second arc plates with the first arc plates 3, so that as many follow-up through holes 5 as possible can be formed on the spherical surface, arc structures are arranged at the corners of the follow-up through holes 5, and the internal stress of products is reduced.
Referring to fig. 1, a description will now be given of a tool for transporting spherical frames of nuclear magnetic resonance equipment provided by the present invention. The utility model provides a spherical frame transportation frock of nuclear magnetic resonance equipment for transport foretell spherical frame of nuclear magnetic resonance equipment, including support bracket 8 and vertical support frame 109, vertical support frame 109 sets firmly in one side of support bracket 8, is provided with the slope support frame between vertical support frame 109 and the support bracket 8, has seted up the first draw-in groove 11 of horizontal setting on the vertical support frame 109, has seted up the second draw-in groove 12 of horizontal setting on the slope support frame, and first draw-in groove 11 and second draw-in groove 12 are used for clamping strengthening rib 6, and support bracket 8 up end is equipped with a plurality of locating pieces 13, and a plurality of locating pieces 13 interval sets up and be the circumference and arrange, is used for clamping adapter sleeve 7 in its inside.
Compared with the prior art, the spherical frame transportation tool for the nuclear magnetic resonance equipment has the advantages that the connecting sleeve 7 of the spherical frame is vertically arranged on the upper end face of the supporting bracket 8, the connecting sleeve 7 is clamped in the plurality of positioning blocks 13, meanwhile, the reinforcing ribs 6 on the spherical face of the spherical frame are respectively clamped in the first clamping groove 11 and the second clamping groove 12, the stability of the spherical frame for the nuclear magnetic resonance equipment can be ensured by utilizing the plurality of clamping structures, and the problem of collision and scratch caused by shaking in the transportation process of the spherical frame for the nuclear magnetic resonance equipment is avoided.
The support bracket 8 comprises a plurality of cross beams and a plurality of longitudinal beams welded at the lower parts of the cross beams, the longitudinal beams are bearing components, the longitudinal support frame 109 is vertically welded at one side of the cross beams, the upper parts of the longitudinal support frame are transversely welded with connecting beams, the connecting beams adopt U-shaped steel, and a first clamping groove 11 is formed in the connecting beams. Likewise, a connecting beam is welded on the upper inclined surface of the inclined support frame, the connecting beam adopts U-shaped steel, and a second clamping groove 12 is formed in the connecting beam. A plurality of positioning blocks 13 can be welded and fixed on the upper end face of the support bracket 8. In addition, a plurality of locating pieces 13 also can be fixed at the up end of support bracket 8 through the mode of bolting, be equipped with the screw hole in the bottom of locating piece 13, set up a plurality of mounting holes on the longeron of support bracket 8, use the bolt to run through the mounting hole from bottom to top, threaded connection is in the bottom of locating piece 13, and the position of mounting hole can be the circumferencial direction and sets up several groups, through dismouting locating piece 13, can match the location of the adapter sleeve 7 of the different diameters of spherical frame of different models.
As a specific embodiment of the spherical frame of the nmr apparatus provided by the present invention, referring to fig. 2 to 3, a first elastic cushion 14 is disposed in each of the first clamping groove 11 and the second clamping groove 12, and an arc-shaped concave surface 15 is disposed on a side of the first elastic cushion 14, which is used for contacting the reinforcing rib 6. In this embodiment, a U-shaped frame is welded transversely to one side of the longitudinal support plate, which is close to the support bracket 8, and a U-shaped frame is welded transversely to the upper inclined surface of the inclined support plate, and both U-shaped frames have U-shaped openings, which respectively form a first clamping groove 11 and a second clamping groove 12. The first elastic cushion 14 is a rubber cushion and is respectively adhered in the first clamping groove 11 and the second clamping groove 12, the arc-shaped concave surface 15 of the first elastic cushion 14 is consistent with the radian of the reinforcing rib 6, the reinforcing rib 6 can be well matched, and the situation that the reinforcing rib 6 is in rigid contact with the first clamping groove 11 and the second clamping groove 12 to cause collision and scratch is avoided.
As a specific embodiment of the spherical frame of the nmr apparatus provided by the invention, referring to fig. 4, the inner side surface of the positioning block 13 is provided with a second elastic cushion 16, and a cushion block 17 is disposed at the lower part of one side of the second elastic cushion 16, which is used for contacting the connecting sleeve 7. In this embodiment, the lower portion of the inner side wall of the positioning block 13 is provided with a yielding groove, the second elastic cushion 16 is a rubber cushion, and is adhered to the inner side wall of the positioning block 13, the bottom of the outer side surface of the second elastic cushion 16 is integrally formed with an outwardly protruding clamping block, and the clamping block is inserted into the yielding groove, so that the stability of the second elastic cushion 16 can be ensured, and the second elastic cushion 16 is prevented from falling out from the inner side of the positioning block 13. Meanwhile, a cushion block 17 is integrally formed at the bottom of the inner side wall of the second elastic cushion layer 16, the cushion block 17 extends to the inner side of the positioning block 13, and the lower end face of the connecting sleeve 7 of the spherical frame is placed on the upper end faces of the cushion blocks 17. Because the end face and the side wall of the connecting sleeve 7 are both processing surfaces, the side inner wall of the second elastic cushion 16 can avoid the rigid contact between the side wall of the connecting sleeve 7 and the positioning block 13, and the cushion block 17 can avoid the rigid contact between the end face of the connecting sleeve 7 and the upper end face of the supporting bracket 8. The second elastic cushion 16 can effectively protect the processing surface of the connecting sleeve 7 and avoid the problem of collision and scratch.
Referring to fig. 1 and 5 to 8, a process for producing a spherical frame of a nuclear magnetic resonance apparatus according to the present invention will now be described. A production process of a spherical frame of nuclear magnetic resonance equipment comprises the following steps:
s1: modeling: taking the end face of the shell 1 as a parting surface, arranging a whole circle of cross runners along the outer ring of the end face, arranging straight runners on opposite sides of the cross runners respectively, arranging a plurality of inner runners at intervals on the inner sides of the cross runners, arranging a plurality of top dead heads on the top of the shell 1, arranging exhaust channels at the junction of the first arc plate 3 and the second arc plate 4 and the upper end of the connecting sleeve 7, and burying chill at the lower part of the periphery of the flange 2, the lower part of the periphery of the connecting sleeve 7 and the lower part of the junction of the plurality of first arc plates 3;
s2: smelting: smelting ductile iron made of A536Q material by using an electric furnace, discharging at 1500-1540 ℃, and performing spheroidizing inoculation by adopting a stream inoculation mode;
s3: pouring: adopting a double-leakage-ladle casting mode to cast simultaneously from two straight pouring gates, wherein the casting time is not more than 15min, and simultaneously casting at least two groups of test blocks in the same furnace;
s4: cleaning: adopting a shake box for shakeout, then sequentially completing the removal of a pouring system and primary shot blasting treatment on the blank, and carrying out nondestructive detection and dimension measurement;
s5: and (3) heat treatment: and (3) placing the blank and the test block in a heat treatment furnace at the same time, heating to 550-580 ℃, preserving heat for 3-5h, cooling to 200 ℃ in the furnace, and then air-cooling to room temperature.
Compared with the prior art, the spherical frame production process of nuclear magnetic resonance equipment provided by the invention has the advantages that the end face of the shell 1 is taken as a parting surface, a whole circle of cross runners are distributed along the outer ring of the end face, the opposite sides of the cross runners are respectively provided with a sprue, the inner sides of the cross runners are distributed with a plurality of inner runners at intervals, the top of the shell 1 is provided with a plurality of top risers, the junction of the first arc plate 3 and the second arc plate 4 and the upper end of the connecting sleeve 7 are provided with exhaust channels, and chill is buried at the lower part of the circumference of the flange 2, the lower part of the circumference of the connecting sleeve 7 and the lower part of the junction of the plurality of first arc plates 3; and smelting the ductile iron made of the A536Q material by using an electric furnace, wherein the tapping temperature is 1500-1540 ℃, and performing spheroidizing inoculation treatment by adopting a stream inoculation mode. Adopting a double-leakage-ladle casting mode to cast simultaneously from two straight pouring gates, wherein the casting time is not more than 15min, and simultaneously casting at least two groups of test blocks in the same furnace; adopting a shake box for shakeout, then sequentially completing the removal of a pouring system and primary shot blasting treatment on the blank, and carrying out nondestructive detection and dimension measurement; through laying two sprue, whole circle cross gate and a plurality of ingate, under the reasonable prerequisite of guaranteeing to smelt, promoted the speed of pouring to lay cap mouth, exhaust passage and chill, guarantee the compactness of the inside tissue of product, through subsequent clearance and heat treatment technology, obtain the spherical frame product that the quality satisfies the requirement.
The steel brick is buried in the bottom of the cross gate opposite to the straight gate, the end face of the steel brick opposite to the straight gate is coated with refractory paint, in order to meet the requirement of casting pressure, the straight gate is required to be larger than the height of a cavity in a box body at the upper part of a product, and high-temperature molten metal can impact the cross gate opposite to the bottom of the straight gate after entering from the straight gate due to the large height of the straight gate, so that the steel brick is buried to avoid damage of impact force to a sand mould, reduce the defect of sand inclusion of castings and simultaneously consider the refractory capability of the position. The thickness of the coating of the refractory coating at this location should not be less than twice the thickness of the coating in its cavity.
The spherical frame of nuclear magnetic resonance equipment provided by the invention is made of ASTM A536 65-45-12, and is a spheroidal graphite cast iron brand of American standard;
the components in percentage are (base iron):
C：3.6-3.9Wt％，Si：1.1-1.3Wt％，Mn：<0.2Wt％，P：<0.04Wt％，S：<0.03Wt％。
in the smelting process, the nodulizer is made of Longnan FD-3A heavy rare earth nodulizer, and the adding amount is 1.0% -1.5%. Inoculant was inoculated with 30% of Fuzz 390 pretreatment and 65% -70% of 75+ inoculant. Spheroidizing agent covers the iron beans. The reaction time is preferably controlled to be 100s to 120 s. The spheroidizing tundish retains 20-25% of the base iron.
Before pouring, the upper box is used as a bearing, two parallel steel beams are erected, two straight pouring gates are all positioned at the middle parts of the two steel beams, and after the two steel beams are paved, the upper box is fixed in a spot welding mode. During pouring, the leakage package is placed on the two steel beams, so that the package hole of the leakage package is opposite to the sprue, a plumb is utilized for positioning, the plumb is suspended below the package hole of the leakage package in advance, and the plumb is suspended into the sprue, and when the plumb is positioned in the middle of the sprue, the position of the leakage package is determined. In the casting process, a shaking ladle is required to be prepared as a supplementary ladle, and molten iron is supplementary to any one of the leakage ladle through the supplementary ladle, so that the casting quantity is ensured to meet the requirements of blanks.
During heat treatment, the furnace charging temperature of the blank is less than 200 ℃, the furnace cooling speed is less than 50 ℃/h, and the heat preservation time is determined according to the maximum wall thickness of the blank, namely 25mm/h.
Carrying out metallographic analysis and mechanical property detection on the test blocks in the same furnace after heat treatment, wherein the spheroidization rate is more than or equal to 85%;
the performance is as follows: sigma (sigma) b ≥450；б s ≥310；δ≥12；HB156-217。
Example 1:
the components in percentage are (base iron):
C：3.6Wt％，Si：1.22Wt％，Mn：0.12Wt％，P：0.033Wt％，S：0.013Wt％。
the adding amount of the Longnan FD-3A heavy rare earth nodulizer is 1.2 percent. Inoculant was inoculated with 30% of Fuzz 390 pretreatment and 70% of 75+ inoculant for 100s. The spheroidizing tundish is used for retaining 25% of base molten iron, and the tapping temperature is 1500 ℃;
pouring time is 13min and 11s, and no supplementary treatment is carried out;
after blank cleaning, charging at 76 ℃, heating up to 550 ℃ at a speed of 80 ℃/h, preserving heat for 3.5 hours, cooling to 200 ℃ in a furnace, cooling to room temperature at a speed of 40 ℃/h, and cooling to room temperature by air;
the hardness and mechanical properties of the two groups of test blocks are shown in the table one,
list one
Example 2:
the components in percentage are (base iron):
C：3.78Wt％，Si：1.17Wt％，Mn：0.16Wt％，P：0.013Wt％，S：0.007Wt％。
the adding amount of the Longnan FD-3A heavy rare earth nodulizer is 1.3 percent. Inoculant was inoculated with 30% of Fuzz 390 pretreatment and 70% of 75+ inoculant for 100s. The spheroidizing tundish is used for retaining 25% of base molten iron, and the tapping temperature is 1520 ℃;
pouring time is 12min and 56s, and no supplementary treatment is carried out;
after blank cleaning, charging at 71 ℃, heating up to 570 ℃ at a speed of 80 ℃/h, preserving heat for 4 hours, cooling to 200 ℃ in a furnace, cooling to room temperature at a speed of 40 ℃/h in the furnace, and cooling to room temperature in an air cooling way;
the hardness and mechanical properties of the two groups of test blocks are shown in a second table,
watch II
As a specific implementation manner of the production process of the spherical frame of the nuclear magnetic resonance equipment provided by the invention, referring to fig. 5 to 6, in step S1, the chill at the lower part of the peripheral ring of the flange 2 and the chill at the lower part of the peripheral ring of the connecting sleeve 7 are all spaced by 5-10 cm, the chills at the junction of the plurality of first arc plates 3 are arranged in a matrix, the interval is 5-10 cm, and chromite sand is embedded between the chills. In this embodiment, before using, the chiller is subjected to pickling treatment to remove rust on the surface, and the chiller at the lower part of the flange 2 circumference and the chiller at the lower part of the connecting sleeve 7 circumference are rectangular and buried at intervals in the circumferential direction. The chilling blocks at the junction of the plurality of first arc plates 3 are processed in advance to form an arc surface structure close to the side surface of the first arc plates 3, and the arc surface structure is matched with the spherical surface of the spherical frame and buried in a matrix at intervals. The distance between the chill and the cavity is 5-10 cm, chromite sand is pre-buried between the chill and the cavity, the chromite sand is special sand for casting, is natural spinel mainly containing chromite, is crushed and screened into specified granularity, is a chilling material, and can be matched with the chill to rapidly cool molten metal in the area, so that the preferential solidification of molten metal at the position of the large cavity can be improved, and the internal tissue form of the position can be improved.
As a specific implementation mode of the nuclear magnetic resonance equipment spherical frame production process provided by the invention, after the step S2, the spherical frame is penetrated into the liquid surface by a preheated stirring bar to be more than 400mm, and is stirred for at least 10 circles along the same direction. In the embodiment, the stirring rod is inserted 400mm below the liquid level of the molten metal, and the molten metal is stirred clockwise or anticlockwise, so that the spheroidization rate of the molten metal can be improved, and the quality of the molten metal is ensured. Meanwhile, impurities in the molten metal can quickly float upwards, and slag inclusion defects of castings are reduced.
As a specific implementation mode of the nuclear magnetic resonance equipment spherical frame production process provided by the invention, after the step S5, secondary shot blasting treatment is carried out, and the diameter of the shot subjected to the secondary shot blasting treatment is smaller than that of the shot subjected to the primary shot blasting treatment. In the embodiment, the primary shot blasting treatment adopts the steel shot with the enlarged particle diameter of 1.0-1.8mm, and can eliminate partial internal stress in the casting through primary shot blasting, and remove partial uncleaned and complete sand-sticking. The diameter of the shot subjected to secondary shot blasting is 0.2-0.8mm, so that the surface finish of the casting can be improved, and the paint spraying or plastic spraying effect can be improved especially for a non-processed surface.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The spherical frame of nuclear magnetic resonance equipment is a cast molded part as an integral whole, and is characterized by comprising a hemispherical shell, wherein a flange is arranged on the end face of the shell, a plurality of first arc plates are distributed on the spherical surface of the shell in a longitudinal line, a plurality of second arc plates are distributed on the spherical surface of the shell in a latitudinal line, the second arc plates are concentrated in the middle of the spherical surface, the first arc plates and the second arc plates divide the spherical surface into a plurality of areas, a plurality of follow-up through holes are formed in the areas, reinforcing ribs arranged along the length direction of the outer side face of the first arc plates are arranged on the spherical surface, a connecting sleeve extending to the outer side of the shell is arranged on the spherical surface, and the spherical center of the shell is positioned on the axis of the connecting sleeve.
2. The nuclear magnetic resonance equipment spherical frame transportation tool is used for transporting the nuclear magnetic resonance equipment spherical frame according to claim 1 and is characterized by comprising a support bracket and a longitudinal support frame, wherein the longitudinal support frame is fixedly arranged on one side of the support bracket, an inclined support frame is arranged between the longitudinal support frame and the support bracket, a first clamping groove which is transversely arranged is formed in the longitudinal support frame, a second clamping groove which is transversely arranged is formed in the inclined support frame, the first clamping groove and the second clamping groove are used for clamping the reinforcing rib, a plurality of positioning blocks are arranged on the upper end face of the support bracket, and the positioning blocks are arranged at intervals and are circumferentially arranged for clamping the connecting sleeve inside the connecting sleeve.
3. The nuclear magnetic resonance equipment spherical frame transportation tool according to claim 2, wherein the first clamping groove and the second clamping groove are respectively provided with a first elastic cushion, and one side of the first elastic cushion, which is used for contacting the reinforcing rib, is provided with an arc-shaped concave surface.
4. The nuclear magnetic resonance equipment spherical frame transportation tool according to claim 2, wherein a second elastic cushion layer is arranged on the inner side surface of the positioning block, and a cushion block is arranged at the lower part of one side of the second elastic cushion layer, which is used for being contacted with the connecting sleeve.
5. A process for producing the spherical frame of nuclear magnetic resonance equipment according to claim 1, characterized by comprising the steps of:
s1: modeling: arranging a whole circle of cross runners along the outer ring of the end face by taking the end face of the shell as a parting surface, arranging straight runners on opposite sides of the cross runners respectively, arranging a plurality of inner runners at intervals on the inner sides of the cross runners, arranging a plurality of top dead heads on the top of the shell, arranging exhaust channels at the junction of a first arc plate and a second arc plate and the upper end of a connecting sleeve, and burying chill at the lower part of the flange circumference, the lower part of the connecting sleeve circumference and the lower part of the junction of a plurality of first arc plates;
s2: smelting: smelting ductile iron made of A536Q material by using an electric furnace, discharging at 1500-1540 ℃, and performing spheroidizing inoculation by adopting a stream inoculation mode;
s3: pouring: adopting a double-leakage-ladle casting mode to cast simultaneously from two straight pouring gates, wherein the casting time is not more than 15min, and simultaneously casting at least two groups of test blocks in the same furnace;
s4: cleaning: adopting a shake box for shakeout, then sequentially completing the removal of a pouring system and primary shot blasting treatment on the blank, and carrying out nondestructive detection and dimension measurement;
s5: and (3) heat treatment: and (3) placing the blank and the test block in a heat treatment furnace at the same time, heating to 550-580 ℃, preserving heat for 3-5h, cooling to 200 ℃ in the furnace, and then air-cooling to room temperature.
6. The process for producing a spherical frame of nuclear magnetic resonance equipment according to claim 5, wherein in the step S1, the intervals between the chill at the lower part of the flange circumference and the chill at the lower part of the connecting sleeve circumference are respectively 5-10 cm, the chills at the junction of the plurality of first arc plates are arranged in a matrix, the intervals are 5-10 cm, and chromite sand is pre-buried between the chills.
7. The process for producing a spherical frame for nuclear magnetic resonance equipment according to claim 5, wherein after step S2, the spherical frame is immersed more than 400mm in the liquid surface with a preheated stirring bar and stirred in the same direction for at least 10 turns.
8. The process for producing a spherical frame for nuclear magnetic resonance equipment according to claim 5, wherein after step S5, a secondary shot blasting is performed, and the diameter of the shot subjected to the secondary shot blasting is smaller than that of the shot subjected to the primary shot blasting.
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