CN108447677B - Electromagnetic induction coil manufacturing die and coil manufacturing method - Google Patents
Electromagnetic induction coil manufacturing die and coil manufacturing method Download PDFInfo
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- CN108447677B CN108447677B CN201810438526.6A CN201810438526A CN108447677B CN 108447677 B CN108447677 B CN 108447677B CN 201810438526 A CN201810438526 A CN 201810438526A CN 108447677 B CN108447677 B CN 108447677B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
- H01F41/071—Winding coils of special form
Abstract
The invention relates to a manufacturing die and a manufacturing method of an electromagnetic induction coil, and provides a manufacturing die and a manufacturing method of an electromagnetic suspension coil with suspension capacity and heating power. The mould of preparation coil comprises 3 parts such as lower extreme toper part, cylinder part and upper end back taper part, and each part all is the axisymmetric design, and each part closely links through the screw that is located the protruding double-screw bolt of part axle center and part axle center sunken. The coil manufacturing die and the method can be used for winding various coils with different configurations, the obtained coil structure has the characteristics of uniform and continuous change of the inner diameter, excellent axial symmetry and the like, the preset spatial electromagnetic field distribution is conveniently generated by the coil, and the long-time stable suspension and heating of a sample are realized.
Description
Technical Field
The invention belongs to the technical field of novel material preparation and electromagnetic suspension, relates to a manufacturing die and a manufacturing method of an electromagnetic induction coil, and particularly relates to a manufacturing die and a manufacturing method of an electromagnetic suspension coil capable of providing suspension capacity and heating power simultaneously.
Background
Due to high-efficiency heating efficiency, controllable power intensity and heating area, the electromagnetic induction heating technology is widely applied to industries such as metallurgy and heat treatment, such as induction melting of high-melting-point metal, quenching and hardening of the surface of a metal workpiece, induction welding of metal pipe fittings and the like. Induction heating devices in different fields have coils with specific structures for generating the required electromagnetic field, see the literature: LUCIA O, MAUSSION P, DEDE E J, BURDIO J M.Indaction Heating technologies and Applications, Past Developments, Current technologies, and Future changes [ J ]. IEEE Transactions on Industrial Electronics,2014,61(5): 2509-2520; from coils applied to the heat treatment of the workpiece surface, see literature: RUDNEV, LOVELESS D, cool r.handbook of induction Heating,2nd Edition [ M ].2017 (size about 0.05M) to flat disc-like coil sets in induction cookers, see literature: SANZ F, SAGES C, LLORENTE S.INDUCTION Heating application With aMobile Double-Coil indicator [ J ]. IEEE Transactions on Industry Applications 2015,51(3):1945 + 1952 (size about 0.2m) and Heating coils for large induction melting plants, see literature: RUDNEVV, LOVELESS D, COOK R.handbook of Induction Heating,2nd Edition [ M ].2017 (size about 1M), the coil structures are different due to different equipment purposes, and if the temperature uniformity of the surface of a workpiece needs to be met, the configuration of the coil needs to be further optimized.
The electromagnetic suspension smelting technology is an important application direction of induction heating, and plays a very important role in the directions of new material development, solidification research and the like. Unlike the industry which processes metals using only the eddy current thermal effect of induction coils, the electromagnetic field generated by an electromagnetic levitation coil provides two effects: firstly, the suspension metal body obtains strong heating effect; and secondly, providing continuous and stable suspension force to support the material to realize container-free processing. The distribution of the spatial electromagnetic field strongly depends on the configuration of the electromagnetic suspension coil, so the optimal design and the actual processing of the coil structure are very important, and the method is a key point for successfully implementing the suspension of the metal material.
The simple and easy-to-use electromagnetic suspension coil can be made by simply winding a copper wire with a certain length around a round bar, and the coil is characterized in that the inner diameter is single, so most of the electromagnetic suspension coils are cylindrical or derived from the cylindrical electromagnetic suspension coils, and the coil is disclosed in the documents: GAO L, SHI Z, LI D, MCLEAN A, CHATTOPADHYAY K. dimensional Analysis and statistical Modeling of Rebalancing kinetics [ J ]. Metallurgical and Materials transformations B,2016,47(3): 1905-. However, after the suspension mass of the metal is further increased, the suspension performance generated by the electromagnetic field formed by the cylindrical electromagnetic coil cannot meet the requirement of electromagnetic suspension container-free processing.
In order to optimize the electromagnetic field distribution of the suspension region and improve the suspension performance or the stability of the suspension region, people perform a series of optimization analysis on the coil to design an electromagnetic suspension coil with a variable inner diameter, such as an upward-opening conical coil, a downward-opening conical coil, or a multilayer coil with a continuously variable inner diameter of the coil.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a manufacturing die and a manufacturing method of an electromagnetic induction coil, aiming at conveniently and quickly processing an ideal electromagnetic coil configuration through a die with a reasonable structural design, so that a preset optimized electromagnetic field is generated, and powerful technical support is provided for subsequent experimental operation.
Technical scheme
The utility model provides a preparation mould of electromagnetic induction coil which characterized in that: the conical part is a conical part structure, a cylindrical metal rod is arranged at the conical top of a truncated cone structure, the diameter of the cylindrical metal rod is equal to that of the circular section of the conical top, and the center of the circular section of the conical top is of an internal thread or external thread structure.
The utility model provides a preparation mould of electromagnetic induction coil which characterized in that: the structure of the cylindrical component is provided, and the two ends of the cylindrical component are provided with internal threads or external threads.
The half cone angle of the conical part is 20-80 degrees, the height of the truncated conical part is 10-100 mm, and the length of the cylindrical metal rod is 50 mm.
The utility model provides a composite structure of electromagnetic induction coil's preparation mould which characterized in that: when the inner diameter of the coil to be processed is constant, a cylindrical part is selected for winding; when one end of the coil to be processed is a conical opening, a conical part and a cylindrical part are selected as dies, and the conical top of the conical part is in threaded connection with the cylindrical part; when the upper end and the lower end of the coil to be processed are both provided with conical openings, two conical parts and a cylindrical part are selected as dies, and two ends of the cylindrical part are respectively in threaded connection with the conical tops of the conical parts; the diameters of the cylindrical part, the cylindrical section and the cylindrical metal rod at the top of the cone are equal.
The diameter of the cylinder of each part is 10-100 mm, and the length is 20-150 mm.
The conical part and the cylindrical part are made of wood, high polymer materials, metal or alloy.
A method for manufacturing a coil by using the manufacturing mold of any electromagnetic induction coil is characterized by comprising the following steps:
step 1, selecting the specification of a wire rod for manufacturing a coil according to experimental requirements:
when the suspended matter r is less than 5mm, the inner diameter of a copper pipe for manufacturing the coil is 1-5 mm;
when the suspended matter r is larger than 5mm, the inner diameter of a copper pipe for manufacturing the coil is larger than 5mm or a hollow conduit with a square or rectangular section is adopted;
when the diameter of the copper pipe is larger than 5mm, annealing the copper pipe;
according to the structural parameters of the target coil: the number of turns, the inner diameter variation trend of each turn and the joint length of the two ends of the coil are calculated to obtain the length of the required copper pipe:
wherein L is the total length of the copper tube required by the coil, L1Length of coil port to coil body,/2Is the length of the copper tube between the suspension coil group and the stabilization coil group, n is the total number of turns of the coil, diIs the inner diameter of the i-th turn coil, dwireIs the outer diameter of the wire, and ε is the coil length correction factor, 0<ε<1；
Step 2: selecting a mould according to design requirements:
if the inner diameter of the coil is constant, selecting a cylindrical part for winding;
if the coil is opened towards one end in a conical manner, a conical part and a cylindrical part are selected as a mould;
if the coil is provided with conical openings at two ends, two conical parts and a cylindrical part are selected as a die, the two conical parts are connected with the cylindrical part through a circular section, and the size of the cone is selected according to design requirements;
and step 3: a layer of insulating sleeve is added on the outer wall of the copper pipe to prevent electric sparks generated among the tightly wound coils;
and 4, step 4: with a reserved length of l1The position of the copper pipe is that the suspension coil group is wound from bottom to top at the position where the selected mould is matched with the diameter of the suspension coil group, and l is reserved after the winding is finished2The length of the coil is used as a copper tube between the suspension group and the stabilization group, and then the stabilization coil group is wound; during the winding process, the wire in the winding part is subjected to 50The uniform tension of 300N is used for ensuring that the wire is tightly attached to the die, and a coil prototype with compact structure and uniform distribution is formed;
and 5: and debugging the coil prototype to ensure that the stable coil group and the suspension coil group are positioned on the same central symmetry axis, and welding joints matched with induction heating equipment at two ends of the wire rods to ensure good conductivity and water-passing performance.
Advantageous effects
The invention provides a manufacturing die and a manufacturing method of an electromagnetic induction coil, and particularly relates to a manufacturing die and a manufacturing method of an electromagnetic suspension coil capable of providing suspension capacity and heating power simultaneously. The mould of preparation coil comprises 3 parts such as lower extreme toper part, cylinder part and upper end back taper part, and each part all is the axisymmetric design, and each part closely links through the screw that is located the protruding double-screw bolt of part axle center and part axle center sunken. The method comprises the following process steps: (1) and selecting the specification of the wire for manufacturing the coil. (2) And selecting the mould parts according to design requirements. (3) And carrying out pretreatment such as annealing, insulating wrapping and the like on the wire. (4) And (3) carrying out coil winding by using the die selected in the step (2) and the wire rod in the step (1). (5) And debugging the coil and welding a joint.
The coil manufacturing die and the method can be used for winding various coils with different configurations, the obtained coil structure has the characteristics of uniform and continuous change of the inner diameter, excellent axial symmetry and the like, the preset spatial electromagnetic field distribution is conveniently generated by the coil, and the long-time stable suspension and heating of a sample are realized. In the case of metals with larger levitation sizes, space requires an optimized electromagnetic field distribution. The method can be used for winding various coils with different configurations, the obtained coil structure has the characteristics of uniform and continuous change of the inner diameter, excellent axial symmetry and the like, the preset spatial electromagnetic field distribution is conveniently generated through the coil, the long-time stable suspension and heating of a sample are realized, and the method is a necessary precondition for realizing the electromagnetic suspension container-free treatment of metal.
Drawings
FIG. 1: schematic diagram of structural principle of coil mold
In the figure, 1 is a conical part, 2 is a cylindrical part, 3 is a conical part, 4 is a central screw hole of the part, and 5 is a screw rod protruding from the axis of the part.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
by utilizing the coil manufacturing die and the coil winding method provided by the invention, the coil with a single-layer downward conical opening is manufactured.
Structural design of the coil: the coil is intended to suspend metal aluminum, copper or titanium of 20mm diameter, wherein the conductivity of aluminum and copper is high (6 x 10)7S/m) requires less suspension current, but the conductivity of the titanium ball is lower (7.4 multiplied by 10)5S/m), the current applied is large. A copper pipe with the diameter of 5mm and the wall thickness of 1mm is selected. According to the size of a sample needing to be suspended, the coil is of a downward conical structure, 5 turns of the lower suspension coil are provided, the inner diameter of each turn is 25mm, 35 mm, 45 mm and 55mm, the half cone angle of the conical part of the coil is about 45 degrees, 2 turns of the upper stable coil are 25mm, and if l is assumed, the sample is suspended in the lower suspension coil, the upper stable coil is provided with l 2 turns of the coil, and1is 25cm, l215cm, taking the correction factor of 0.01, according to
The copper tube length was calculated to be about 150 cm. Meanwhile, according to the coil configuration, a cylindrical part (with the diameter of 25mm and the height of 30mm) and a conical part (with the half cone angle of 45 degrees) are selected as combined dies.
Winding of a coil: the cylindrical metal rod of the conical die is fixed on the bench clamp. Reserving a 25cm straight line segment at one end of the wire, winding the suspension coil group from bottom to top at the position where the selected die is matched with the suspension group coil in diameter, reserving a 15cm length as a copper pipe between the suspension group and the stabilizing group after winding, and then winding the stabilizing coil group; the wire rod positioned at the winding part is subjected to 100N uniform tension to ensure that the wire rod is tightly attached to the die, so that a coil prototype with a compact structure and uniform distribution is formed.
And (5) welding joints of water openings at two ends of the coil prototype, and debugging the final posture of the coil.
Claims (4)
1. A method for manufacturing a coil by adopting a combined structure of two manufacturing dies of an electromagnetic induction coil is characterized in that: the first manufacturing die of the electromagnetic induction coil is of a conical part structure, the conical part is that a cylindrical metal rod is arranged at the bottom of a truncated cone of the conical structure, the diameter of the cylindrical metal rod is equal to that of a circular section at the top of the cone, and the center of the circular section at the top of the cone is of an internal thread or external thread structure; the second manufacturing die of the electromagnetic induction coil is of a cylindrical part structure, and the two ends of the electromagnetic induction coil are of internal thread or external thread structures; when the inner diameter of the coil to be processed is constant, a cylindrical part is selected for winding; when one end of the coil to be processed is a conical opening, a conical part and a cylindrical part are selected as dies, and the conical top of the conical part is in threaded connection with the cylindrical part; when the upper end and the lower end of a coil to be processed are both provided with conical openings, two conical parts and a cylindrical part are selected as dies, and two ends of the cylindrical part are respectively in threaded connection with the conical tops of the two conical parts; the diameter of the radial section of the cylindrical part, the diameter of the upper surface of the truncated cone structure and the diameter of the radial section of the cylindrical metal rod are equal;
the method for manufacturing the coil comprises the following specific steps:
step 1, selecting the specification of a wire rod for manufacturing a coil according to experimental requirements:
when the suspended matter r is less than 5mm, the inner diameter of a copper pipe for manufacturing the coil is 1-5 mm;
when the suspended matter r is larger than 5mm, the inner diameter of a copper pipe for manufacturing the coil is larger than 5 mm;
when the inner diameter of the copper pipe is larger than 5mm, annealing the copper pipe;
according to the structural parameters of the target coil: the number of turns, the inner diameter variation trend of each turn and the joint length of the two ends of the coil are calculated to obtain the length of the required copper pipe:
wherein L is the total length of the copper tube required by the coil, L1Length of coil port to coil body,/2Is a suspension coil group and a stabilization coilThe length of the copper tubes between the groups, n being the total number of turns of the coil, diIs the inner diameter of the i-th turn coil, dwireIs the outer diameter of the wire, and ε is the coil length correction factor, 0<ε<1；
Step 2: selecting a mould according to design requirements:
if the inner diameter of the coil is constant, selecting a cylindrical part for winding;
if the coil is opened towards one end in a conical manner, a conical part and a cylindrical part are selected as a mould;
if the coil is provided with conical openings at two ends, two conical parts and a cylindrical part are selected as a die, the two conical parts are connected with the cylindrical part through a circular section, and the size of the cone is selected according to design requirements;
and step 3: a layer of insulating sleeve is added on the outer wall of the copper pipe to prevent electric sparks generated among the tightly wound coils;
and 4, step 4: with a reserved length of l1The position of the copper pipe is that the suspension coil group is wound from bottom to top at the position where the selected mould is matched with the diameter of the suspension coil group, and l is reserved after the winding is finished2The length of the coil is used as a copper tube between the suspension group and the stabilization group, and then the stabilization coil group is wound; in the winding process, the wire positioned at the winding part is subjected to uniform tension of 50-300N to ensure that the wire is tightly attached to the die, so that a coil prototype with a compact structure and uniform distribution is formed;
and 5: and debugging the coil prototype to ensure that the stable coil group and the suspension coil group are positioned on the same central symmetry axis, and welding joints matched with induction heating equipment at two ends of the wire rods to ensure good conductivity and water-passing performance.
2. The method of manufacturing a coil using a combined structure of two manufacturing molds for an electromagnetic induction coil according to claim 1, wherein: the half cone angle of the conical part is 20-80 degrees, the height of the truncated conical part is 10-100 mm, and the length of the cylindrical metal rod is 50 mm.
3. The method of manufacturing a coil using a combined structure of two manufacturing molds for an electromagnetic induction coil according to claim 1, wherein: the diameter of the cylinder of each part is 10-100 mm, and the length is 20-150 mm.
4. The method of manufacturing a coil using a combined structure of two manufacturing molds for an electromagnetic induction coil according to claim 1, wherein: the conical part and the cylindrical part are made of wood, high polymer materials or metal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810438526.6A CN108447677B (en) | 2018-05-09 | 2018-05-09 | Electromagnetic induction coil manufacturing die and coil manufacturing method |
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| CN201810438526.6A CN108447677B (en) | 2018-05-09 | 2018-05-09 | Electromagnetic induction coil manufacturing die and coil manufacturing method |
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| CN108447677B true CN108447677B (en) | 2020-05-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000241080A (en) * | 1999-02-23 | 2000-09-08 | Fuji Electric Co Ltd | Induction heater |
| CN1933044A (en) * | 2005-09-05 | 2007-03-21 | 株式会社神户制钢所 | Bobbin for superconducting coil, and superconducting solenoid coil |
| KR20130118464A (en) * | 2012-04-20 | 2013-10-30 | 한국표준과학연구원 | Nanoparticle synthesizing apparatus and nanoparticle synthesizing method |
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- 2018-05-09 CN CN201810438526.6A patent/CN108447677B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000241080A (en) * | 1999-02-23 | 2000-09-08 | Fuji Electric Co Ltd | Induction heater |
| CN1933044A (en) * | 2005-09-05 | 2007-03-21 | 株式会社神户制钢所 | Bobbin for superconducting coil, and superconducting solenoid coil |
| KR20130118464A (en) * | 2012-04-20 | 2013-10-30 | 한국표준과학연구원 | Nanoparticle synthesizing apparatus and nanoparticle synthesizing method |
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