KR20210007920A - Apparatus for curing resin - Google Patents

Abstract

The present application relates to a resin curing apparatus. A curing apparatus of the present application can rapidly cure a resin with a high degree of curing and a high filling rate in slots of a cylindrical object having a plurality of narrow and small slots. The resin curing apparatus comprises a cylindrical object including a through space formed in a longitudinal direction, and an edge part having one or more slots formed in the longitudinal direction therein, a solenoid coil, and a magnetic field generating apparatus for applying an alternating current to the solenoid coil.

Description

Resin curing device {Apparatus for curing resin}

This application claims the benefit of the filing date of patent application No. 10-2019-0083976 filed with the Korean Intellectual Property Office on July 11, 2019, all of the contents of which are incorporated in this application.

The present application relates to a resin curing apparatus.

The curable resin can be applied to various applications. The curable resin can be applied, for example, to the formation of various adhesives or pressure-sensitive adhesives, ink for 3D printing, and engineering plastics. In addition, the curable resin can be used to form insulating materials such as insulating coating solutions, bearings, insulating coatings for motors, or insulating sealing materials.

Among the curable resins, in particular, as a method of curing a so-called thermosetting resin cured by heat, for example, a method of applying heat from the outside is applied. For example, a method using hot air or a hot plate may be mentioned.

However, in the case of the above method, there is a problem that the external heat cannot be sufficiently transferred to the inside of the composition, resulting in uneven curing, and there is also a problem that the resin may be damaged when excessive heat is required to completely cure. . In addition, in the case of the above method, there is also a problem that the curing time is very long. In order to solve the problem of the above method, a method of applying heat at a relatively low temperature has been considered, but it is not cured sufficiently, so it is naturally cured during storage or transportation, and its physical properties (for example, insulation and heat resistance properties, etc.) There is also a problem that cannot be kept constant. In addition, in order to solve the problem of the above method, a method of increasing the size of the heat application facility has been considered, but there is still a problem that the cost increases in the process of increasing the size of the facility, and the curing efficiency is not good compared to the enlarged size. .

Accordingly, a method of curing the curable resin by irradiating light such as ultraviolet rays has been considered. In this method, apart from the fact that rapid curing is possible, the curing is smooth only from the outside, causing non-uniform curing of the resin, and the curable resin inside remains, so that additional heat treatment is required.

In addition, a method of applying a curable resin on a metal substrate and applying an electromagnetic field thereto to induction heating the metal substrate by the electromagnetic field has been considered. However, in this method, it is difficult to control the degree of heating, and when two or more types of metal substrates are applied, heat conduction, expansion, or contraction between the metal substrates is induced, and the difference in the curing degree of the resin in the adjacent portion and the spaced portion is large. There was also a problem.

In addition, a method of curing the curable resin by irradiating infrared rays has also been considered. However, this method still does not solve the problem of the method of applying the aforementioned hot air or hot plate.

One object of the present application is to provide a resin curing apparatus capable of filling a curable resin with excellent hardness and high filling rate within a short time even in a filling portion having a small area.

The present application relates to a resin curing apparatus. The device of the present application comprises at least a cylindrical object.

The tubular object includes at least a through space and an edge portion. The through space is formed so as to penetrate the cylindrical object in a longitudinal direction inside the cylindrical object. That is, the through space is formed along the length direction.

The rim portion of the tubular object includes (or has) one or more slots. The slot is formed along the length direction at the edge portion (see FIG. 1). In addition, when the resin is cured using the apparatus of the present application, a cured product of the resin is filled inside the slot.

In the present application, the machine direction of an object may mean a direction in which the length is longer among the directions of a surface parallel to a surface having the largest area in the object. In addition, the transverse direction of an object may mean a direction perpendicular to the longitudinal direction within the plane direction. Further, the thickness direction of an object may mean a normal direction of a surface formed by the longitudinal and transverse axes.

In the present application, vertical, parallel, orthogonal, or horizontal, among the terms defining an angle, means substantially vertical, parallel, orthogonal or horizontal within a range that does not impair the objective effect, and the vertical, parallel, orthogonal or horizontal range Is to include errors such as manufacturing error or variation. For example, in each of the above cases, an error within about ±15 degrees, an error within about ±10 degrees, or an error within about ±5 degrees may be included.

In one example, the cross-section of the edge portion, specifically, the shape of the cross-sectional shape of the edge portion in the width direction is not particularly limited. The shape of the cut surface in the width direction of the edge portion may be, for example, a ring shape (circle), an ellipse shape, a polygonal shape of more than a triangle, or an amorphous shape. In consideration of the transmission efficiency of the magnetic field generated by the solenoid coil to be described later, a ring shape is appropriate. In the above, the shape of the cut surface in the width direction of the edge portion may mean the shape of the cut portion when the cylindrical object is cut along an arbitrary direction perpendicular to the length direction.

The apparatus of the present application may further include a means for fixing, transferring, or rotating the cylindrical object together with the cylindrical object. The configuration of the means is not particularly limited, and articles such as various materials or shapes capable of implementing the functions described above may be applied. By providing the means, it is possible to uniformly apply the electromagnetic field by the solenoid coil described later. In particular, the means capable of rotating the cylindrical object is, when curing a resin using the apparatus of the present application, when the precursor of the cured resin, for example, a curable composition, etc., is in a liquid state, the composition is There is also the advantage of preventing spillage within the injected slot. In the present application, as a device configuration such as the fixing means, as long as it is an element capable of implementing the function, what is known in the art may be applied as it is.

The apparatus of the present application further includes a solenoid coil formed to generate a magnetic field by being inserted into the tubular through space together with the tubular object. In the present application, a solenoid coil having a generally known shape can be applied. For example, in the present application, as a solenoid coil, a coil in a form in which a conductor wire formed of copper or the like is wound in a cylindrical shape, or a coil in a form in which a cylindrical rod composed of ferromagnetic metal is wound as a conductor may be applied. The cylindrical object may be induction heated by a magnetic field formed by the solenoid coil. In addition, when a precursor of a cured resin material, for example, a curable composition, etc., includes a magnetic material, the magnetic material may also be induction heated by a magnetic field formed by the solenoid coil.

The apparatus of the present application includes a magnetic field generating device formed to apply a current (specifically, alternating current) to the solenoid coil together with the cylindrical object and the solenoid coil. In other words, the current (alternating current) applied by the magnetic field generating device allows the solenoid coil to generate a magnetic field, and the magnetic field formed in this way is the cylindrical object, and in some cases, the cured resin together with the cylindrical object. The magnetic body inside the precursor (curable composition, etc.) can be induction heated.

The apparatus of the present application may further include known means required for other device configurations in addition to the above-described means, solenoid coil, and magnetic field generating apparatus. The other means include, for example, a temperature control unit for sensing a temperature in a cylindrical object or a through space; A resin supply unit for supplying a curable resin or the like to the slot; An integrated control unit that senses and controls the overall driving can be illustrated.

The resin curing apparatus of the present application not only has the above-described apparatus configuration, but also by designing such constituent elements to satisfy specific formulas, it is possible to further secure physical properties of the cured resin product and advantages in the manufacturing process thereof. Specifically, the resin curing device is designed such that, among the constituent elements of the device designed as described above, in particular, a cylindrical object, a solenoid coil, and a magnetic field generating device satisfy the following Equations 1 and 2. In the case of applying a curing device designed in this way, the curable resin can be cured in a short time with excellent hardness and high filling rate even within a small area filling part (e.g., a narrow area slot):

[Equation 1]

P×t ≥ κ×π×(R _o ² -R _i ² )×L _s ×c×(TT _R )

[Equation 2]

100 kHz ≤{(L _c )/(4×π ³ ×μ ₀ ×N ² ×R _c ² ×C)} ^1/2 ≤ 1000 kHz

Hereinafter, the meaning of each variable in the equation and the derivation process of the equation will be described in more detail.

In Equation 1, P is the maximum output (unit: kW) of the magnetic field generating device. This can be freely adjusted in consideration of the performance of the magnetic field generating device, the resin to be cured, or the physical properties of the cylindrical object. In one example, P in Equation 1 may be in the range of 1 kW to 400 kW. In another example, P in Equation 1 is 5 kW or more, 10 kW or more, 15 kW or more, 20 kW or more, 25 kW or more, 30 kW or more, 35 kW or more, 40 kW or more, 50 kW or more, 60 kW or more, 70 It may be kW or more, 80 kW or more, 90 kW or more, or 100 kW or more, 390 kW or less, 380 kW or less, 370 kW or less, 360 kW or less, 350 kW or less, 340 kW or less, 330 kW or less, 320 kW or less, 310 It may be kW or less or 300 kW or less.

In Equation 1, t is the time (unit: second) for the magnetic field generating device to apply current (specifically, alternating current) to the solenoid coil. The t is another meaning, and may mean the time required to cure the resin using the device, and this means that the smaller it is, the more sufficient the resin can be cured within a short time. In one example, the t may be in the range of 10 seconds to 5000 seconds. The t is 20 seconds or more, 30 seconds or more, 40 seconds or more, 50 seconds or more, 60 seconds or more, 70 seconds or more, 80 seconds or more, 90 seconds or more, 100 seconds or more, 150 seconds or more, 200 seconds or more, 250 seconds or more Or 300 seconds or more, 4500 seconds or less, 4000 seconds or less, 3500 seconds or less, 3000 seconds or less, 2500 seconds or less, 2000 seconds or less, 1500 seconds or less, 1000 seconds or less, 900 seconds or less, 800 seconds or less, 700 seconds or less Or 600 seconds or less.

In Equation 1, κ is a constant, and may be in the range of 0.1 to 20. Specifically, κ may mean an absorption factor of the cylindrical object, which is a factor that varies depending on a material constituting the object and a cross-sectional shape of an edge portion. For example, when the material of the cylindrical object is mild steel (a metal having a carbon content of about 0.23% by weight), and the shape of the cross section of the rim is a ring shape, the value of the absorption factor is about 2.0 to be. In another example, when the material of the cylindrical object is copper, and the cross-sectional shape of the rim portion is ring-shaped, the value of the absorption factor is about 5.2. In another example, when the material of the cylindrical object having the rim portion of the ring-shaped cross-sectional shape is aluminum, the value of the absorption factor is about 4.9. Therefore, the κ may have various values, may be about 0.5 or more, 1 or more, or 1.5 or more, and may be about 15 or less, 10 or less, 9 or less, 8 or less, 7 or less, or 6 or less. have. In the above, when the material of the tubular object is a specific component, it means that the tubular object contains the specific component as a main component. In the present application, when A includes B as a main component, it may mean that B is included in a proportion of 50% or more based on the total weight of the entire composition including A and B. The ratio may be, in another example, 55% or more, 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, 90% or more, and approximately 100% or 99% or less, 98 % Or less, 97% or less, 96% or less, or 95% or less.

In Equation 1, π is the circumference. The value of the circumference is usually about 3.14, a value known in the art.

In Equation 1, R _o is the outer radius (unit: m) of the tubular object, and R _i is the inner radius (unit: m) of the tubular object. As described above, when the shape of the cross-section of the edge portion is a ring shape, the meaning is applied as it is, but when the shape is a shape other than a ring shape, the outer and inner radii are virtual having the same cross-sectional area as the shape. Apply the outer and inner radii of the ring shape of (see Fig. 2).

The solenoid coil is inserted into the through space inside the tubular object, so that a magnetic field may be generated toward the edge of the tubular object. In this case, by appropriately adjusting the ratio of the outer radius and the inner radius of the edge portion, an appropriate amount of magnetic field may be applied to the cylindrical object. Accordingly, in Equation 1, the ratio (R _i /R _o ) of the outer radius (R _o ) and the inner radius (R _i ) of the edge portion may be in the range of 0.2 to 0.85. In another example, the ratio may be 0.25 or more, 0.3 or more, 0.35 or more, 0.4 or more, 0.45 or more, 0.5 or more, 0.55 or more, or 0.6 or more, and may be 0.8 or less, 0.75 or less, 0.7 or less, or 0.65 or less.

Within the range satisfying the ratio, the outer radius R _o of the cylindrical object may be, for example, in the range of 0.05 m to 10 m. The value, in another example, may be 0.07 m or more, 0.08 m or more, or 0.1 m or more, and 9 m or less, 8 m or less, 7 m or less, 6 m or less, 5 m or less, 4 m or less, 3 m or less, It may be 2 m or less, 1 m or less, or 0.5 m or less.

In Equation 1, L _s means the length (unit: m) of the cylindrical object. This may be appropriately adjusted in consideration of the length of the solenoid coil and the strength of the magnetic field for curing the resin, since the solenoid coil, which will be described later, is inserted into the inner through space of the cylindrical object. In one example, the L _s value may be in the range of about 0.05 m to 10 m. The value may be 0.1 m or more, 0.15 m or more, or 0.2 m or more, and 9 m or less, 8 m or less, 7 m or less, 6 m or less, 5 m or less, 4 m or less, 3 m or less, 2 m or less, or It may be 1 m or less.

In Equation 1, c may mean the specific heat (unit: kJ/(kg×°C)) of the tubular object. The specific heat may vary depending on a material constituting the tubular object (ie, the material of the tubular object). For example, when the material constituting the tubular object is mild steel, the specific heat may be in the range of about 0.4 kJ/(kg×° C.) to 0.5 kJ/(kg×° C.).

In Equation 1, ρ may mean the specific gravity (unit: kg/m ³ ) of the tubular object. The specific gravity may also vary depending on a material constituting the tubular object (ie, the material of the tubular object). For example, when the material constituting the cylindrical object is mild steel, the specific gravity may be in the range of approximately 7.5×10 ³ kg/m ³ to 8.0×10 ³ kg/m ³ .

In Equation 1, T may mean the temperature (unit: °C) of the tubular object. Specifically, in Equation 1, T may mean the temperature of the tubular object heated by the magnetic field generated by the solenoid coil (that is, the temperature of the tubular object to be heated by the solenoid coil). Can). The range is not particularly limited as long as the temperature is such that the resin can be cured. For example, the temperature may be in the range of 100 ℃ to 1000 ℃. In another example, the temperature may be 150 ℃ or more, 160 ℃ or more, 170 ℃ or more, 180 ℃ or more, 190 ℃ or more, 200 ℃ or more, 210 ℃ or more, 220 ℃ or more, 230 ℃ or more, 240 ℃ or more, 900 ℃ or less, 800 ℃ or less, 700 ℃ or less, 600 ℃ or less, 500 ℃ or less, 400 ℃ or less, 350 ℃ or less, 300 ℃ or less, 290 ℃ or less, 280 ℃ or less, 270 ℃ or less, 260 ℃ or less or 250 ℃ or less I can.

In Equation 1, T _R is room temperature (unit: °C). In the present application, the term “room temperature” refers to a natural temperature that is not particularly heated and/or reduced, and, for example, refers to a temperature in the range of 20° C. to 30° C., or about 23° C. or 25° C. can do.

Therefore, Equation 1, when the power of the magnetic field generating device is P, according to the material of the tubular object to be designed to heat the tubular object within a time of t from T _R to T temperature It can mean size (outer radius, inner radius, and length).

Hereinafter, the derivation process of Equation 1 will be described in more detail.

The energy required to heat an object with mass M (unit: kg) and specific heat c (unit: kJ/(kg×℃)) from T _R to T temperature (E, unit: kJ) is the following general formula 1 Is the same as:

[General Formula 1]

E = M×c×(T _R -T)

Here, in order to inductively heat an object by using the magnetic field generating device, in addition to energy for heating the object, transport phenomena such as convection of heat and conducted radiation must be considered. Therefore, the above-described absorption factor κ (unit: none) in consideration of the shape and material of the object must be considered, and the energy in consideration of the power P (unit: kW) of the magnetic field generating device required for this is as in General Formula 2:

[General Formula 2]

P×t = κ×{M×c×(T _R -T)}

In one example, if the object is a cylindrical object described above, its mass (M) can be calculated according to the following general formula 3:

[General Formula 3]

M = (R _o ² -R _i ² )×π×L _s ×ρ

The meaning of each factor of Formulas 1 to 3 is the same as that described in Formula 1 above.

The energy for heating the tubular object to a specific temperature should be at least lower than the energy required to drive the magnetic field generating device. Therefore, when these conditions and the general formulas 1 to 3 are combined, the formula 1 may be obtained.

In Equation 2, L _c may mean the length (unit: m) of the solenoid coil. This may be appropriately adjusted in consideration of the length of the above-described cylindrical object and the strength of a magnetic field required for manufacturing a cured resin. In one example, the length may be in the range of 0.01 m to 15 m. In another example, the length may be 0.05 m or more, 0.1 m or more, 0.15 m or more, or 0.2 m or more, and 10 m or less, 9 m or less, 8 m or less, 7 m or less, 6 m or less, 5 m or less, 4 It may be m or less, 3 m or less, 2 m or less, or 1 m or less.

In Equation 2, μ ₀ is the permeability of vacuum, which may be 4×π×10 ^-7 H/m as a constant.

In Equation 2, N may mean the number of turns (no unit) of the solenoid coil. Specifically, N may mean the total number of times the conductor is wound from the start point to the end point of the conductor wire, and may be appropriately adjusted in consideration of the strength of the magnetic field applied to the cylindrical object. In one example, N may be in the range of 2 to 30. In another example, N may be in the range of 3 to 25, 3 to 20, or 3 to 15.

In Equation 2, R _c may mean the radius (unit: m) of the solenoid coil. R _c may mean the radius of the virtual cylinder formed by the solenoid coil, and if the size of the cross-sectional area varies in each longitudinal direction and thus R _{c is} also different, the value is the surface with the maximum cross-sectional area and the surface with the minimum cross-sectional area, respectively. May be the average of the radii of The R _c value may be appropriately adjusted in consideration of the inner radius of the cylindrical object and the strength of a magnetic field applied to the object. For example, a ratio (R _c /R _i ) of an inner radius (R _i ) of the cylindrical object and a radius (R _c ) of the solenoid coil may be in a range of 0.5 to 0.99. In another example, the ratio (R _c /R _i ) may be 0.98 or less, 0.97 or less, 0.96 or less, or 0.95 or less, and may be 0.5 or more, 0.6 or more, 0.7 or more, 0.8 or more, or 0.9 or more.

In one example, the radius R _c of the coil may be in a range of 0.005 m to 8 m within a range satisfying the ratio. The radius, in another example, may be 0.01 m or more, 0.015 m or more, 0.02 m or more, 0.03 m or more, 0.04 m or more, or 0.05 m or more, and 7 m or less, 6 m or less, 5 m or less, 4 m or less, It may be 3 m or less, 2 m or less, 1 m or less, 0.5 m or less, or 0.3 m or less.

In Equation 2, L _c is the length of the solenoid coil. This may be appropriately adjusted in consideration of the strength of the magnetic field applied to the tubular object, the length, shape and area of the tubular object. In one example, L _c may be in the range of 0.01 m to 15 m. In another example, L _c may be 0.05 m or more, 0.1 m or more, 0.15 m or more, or 0.2 m or more, and 14 m or less, 13 m or less, 12 m or less, 11 m or less, 10 m or less, 9 m or less, It may be 8 m or less, 7 m or less, 6 m or less, 5 m or less, 4 m or less, 3 m or less, 2 m or less, or 1 m or less.

In Equation 2, C is the capacitance (unit: μF) of the magnetic field generating device. A magnetic field is generated in the solenoid coil by the current (specifically, alternating current) applied from the magnetic field generating device. As will be described later, the frequency of the AC current applied from the magnetic field generating device may be determined by a capacitance of the magnetic field generating device and an inductance of the solenoid coil. In addition, the inductance of the solenoid coil may be determined according to the number of turns, radius, and length of the solenoid coil. By appropriately adjusting the capacitance of the magnetic field generating device and the inductance of the solenoid coil, the current (alternating current) generated in the magnetic field generating device is within a range that can cure the resin with excellent hardening and filling rate in the slot of the cylindrical object. It can have a frequency.

In one example, the capacitance of the magnetic field generating device may be in the range of 0.01 μF to 1 μF. The capacitance may be, in another example, 0.02 μF or more, 0.03 μF or more, 0.04 μF or more, or 0.05 μF or more, and 0.9 μF or less, 0.8 μF or less, 0.7 μF or less, 0.6 μF or less, 0.5 μF or less, 0.4 μF or less, It may be 0.3 μF or less or 0.25 μF or less.

Therefore, Equation 2 means an appropriate range of the frequency of the alternating current applied by the magnetic field generating device. Specifically, it means that when the frequency of the alternating current applied by the magnetic field generating device according to Equation 2 is within the range of 100 kHz to 1000 kHz, a cured resin having the desired physical properties and process performance in the present application can be manufactured. do. The range of the frequency according to Equation 2, in another example, may be 110 kHz or more, 120 kHz or more, 130 kHz or more, 140 kHz or more, or 150 kHz or more, and 900 kHz or less, 800 kHz or less, 700 kHz or less, or 600 kHz. It can be below.

Hereinafter, the derivation process of Equation 2 will be described in more detail.

The inductance (L, unit: H) of the solenoid coil can be calculated by the following general formula 4:

[General Formula 4]

L = (N ² ×μ×π×R _C ² )/(L _c )

In General Formula 4, the other variables except μ are the same as those described above. In the above, μ is the permeability (permeability, unit: H/m) of a cylindrical rod wound by a solenoid coil, and is defined as in General Formula 5:

[General Formula 5]

μ=μ ₀ ×μ _r

In General Formula 5, μ _r is the relative magnetic permeability (unit: none) of the cylindrical rod wound by the solenoid coil, and μ ₀ is the same as described in Equation 2. In the above, μ _r is determined by the magnetism of the components constituting the rod, for example, when diamagnetic or paramagnetic components are applied as the component, or in the case of atmosphere (air), the value is approximately 1, and the ferromagnetic material Is well above 1. The solenoid coil may be inserted into the cylindrical object, and the object may be heated by a magnetic field generated from the solenoid coil. At this time, since the object is positioned'outside' the solenoid coil, there may be slight deviations, but the value of μ _r may be about 1 regardless of the material of the cylindrical rod wound by the solenoid coil.

In addition, the frequency (f, unit: kHz) of the alternating current applied by the magnetic field generating device may be determined by the following general formula 6:

[General Formula 6]

f = 1/{2×π×(L×C) ^1/2 }

In Formula 6, L is the inductance of the solenoid coil determined according to Formula 5, and the remaining factors are as defined in Formulas 1 and 2 above.

By combining the above general formulas 4 to 6, the correlation between the frequency of the alternating current applied by the magnetic field generating device, the capacitance of the device, and the design parameters of the solenoid coil (ex, winding, length, coil radius, etc.) are derived. . Equation 2 may mean that the frequency of the alternating current applied from the magnetic field generating device derived from this correlation is within an appropriate range for curing the resin.

A resin curing device including a cylindrical object, a solenoid coil, and a magnetic field generator formed to satisfy the above Equations 1 and 2 has a narrow cross-sectional area and can quickly cure a resin with a high degree of curing and a filling rate even in a narrow space. There is an advantage. Accordingly, in the resin curing apparatus of the present application, despite the narrow cross-sectional area and narrow space of the slot, the resin can be cured at a high speed with excellent curing degree and filling rate.

Accordingly, in the apparatus of the present application, the slot formed in the cylindrical object may occupy a small area. Specifically, in the edge portion of the cylindrical object, a ratio of the area of the cut surface in the width direction of the slot and the area of the cut surface in the width direction of the edge portion may be adjusted. Specifically, a ratio (A/B) of the total area (A) of the cut surface in the width direction of the slot and the area (B) of the cut surface in the width direction of the edge portion may be in the range of 0.01 to 0.2. The reason why the A value is defined as the total is due to consideration of the case where a plurality of slots are formed in the rim. In another example, the ratio (A/B) may be 0.05 or more, 0.1 or more, or 0.15 or more, and may be 0.19 or less, 0.18 or less, 0.17 or less, 0.16 or less, or 0.15 or less.

In addition, in the resin curing apparatus of the present application, a plurality of slots may be formed in the rim portion, and accordingly, the resin can be cured with excellent curing degree and filling rate as described above. In one example, the number of slots formed in the rim may be in the range of 4 to 100.

When the resin curing device of the present application including a configuration formed to satisfy Equations 1 and 2 is applied, the resin can be cured at an excellent filling rate in the slot. For example, the device of the present application may cure the resin in the interior of the slot at a filling rate of 80% or more. In another example, the filling rate may be 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, 87% or more, 88% or more, 89% or more, or 90% or more. The filling rate is the resin cured inside the slot or the resin injected into the slot before curing (ex. a resin component included in the curable composition) compared to the internal volume of the slot excluding the volume occupied by elements existing inside the slot such as the winding described later. ) Is a percentage of the volume. The filling rate is advantageous as the value increases, and the upper limit thereof is not particularly limited. Exemplarily, the filling rate may be 100% or less, 99% or less, 98% or less, 97% or less, 96% or less, 95% or less, 94% or less, or 93% or less.

The type of resin applied to the resin curing device of the present application is not particularly limited. For example, in the curing apparatus of the present application, resin may be supplied into the slot, and when AC is applied to the solenoid coil by the magnetic field generating device, the magnetic field generated by the solenoid coil is the cylindrical object ( When the resin is blended with the magnetic particles, the magnetic particles are also induction heated), and the resin in the slot may be cured by the application of the heat.

In the resin curing apparatus of the present application, as the cylindrical object, a device known as a stator for a motor may be applied. That is, in the present application, it is possible to charge while curing the resin in the slot of the motor stator.

In the above, the motor is a device capable of obtaining rotational force from electric energy. For example, the motor may include a so-called stator and a rotor, and the stator may be applied as a cylindrical object of the curing apparatus of the present application, and the shape of the cross section at that time is a ring It can be a shape. Here, the rotor is configured to electromagnetically interact with the stator, and includes a magnetic field; And it can rotate by the force acting between the current flowing through the coil.

Similar to the description of the cylindrical object, the stator may have a plurality of slots formed therein. A wire is wound in the slot, and each wire can be supplied with power by being connected to a lead wire. As the wire wound in the slot, a general winding type wire and a hairpin winding type wire are known.

In the above, the general winding method is a method in which a plurality of relatively thin wires are wound in a slot, and this method has less skin effect at high speed. The hairpin winding method is a method of inserting a relatively thick wire into a slot. According to the hairpin winding method, since there is no waste of space between the coils, the dot ratio can be maximized, and an improvement in output due to a decrease in resistance can be expected.

Thus, the resin curing apparatus of the present application, as the cylindrical object, a stator (stator) in which one or more slots are formed; And it may include at least a winding present in the slot (slot) of the stator (stator). In addition, the stator may have a structure including steel sheets formed of a material such as iron (Fe) stacked in a cylindrical shape, and in this case, the slots are arranged radially along the circumferential direction of the stator, but in this application The type of stator that can be applied is not limited thereto.

In addition, the type of the winding applied in the present application is not particularly limited. In general, the winding is manufactured by applying an insulating coating to a material such as copper (Cu). In the present application, not only such a conventional winding but also other types of windings may be applied. In addition, all types of winding methods such as the general winding method and the hairpin winding method described above can be applied.

3 and 4 show exemplary shapes of the cylindrical object when the above-described motor stator is used. The stators illustrated in FIGS. 3 and 4 are cylindrical (cylindrical) stators as mentioned above, and FIG. 3 is a case in which the stator 100 is observed in the direction of the surface where the slot 101 is formed, and FIG. 4 is the stator This is the case of observing (100) from the side. In addition, FIG. 5 is a side view in which the winding 102 is introduced into the slot of the stator 100 as described above. For the motor stator, since the description of the above-described cylindrical object may be applied as it is, a more detailed description will be omitted.

In addition, an insulating paper may be injected between the slot and the resin to be cured in the process of curing and filling the resin in the slot of the stator by applying the device of the present application. Accordingly, in one example, the resin that is cured by induction heating by a magnetic field generated by the magnetic field generating device and the solenoid coil may be an insulating resin imparted with insulation by insulating paper.

In the apparatus of the present application, in particular, when the cylindrical object is a stator for a motor, as long as the aforementioned resin is cured to fill the interior of the slot, other elements or parts are generally known electric motors. All parts of can be applied.

The curing apparatus of the present application may rapidly cure a resin with a high degree of hardening and a high filling rate in the slot of a cylindrical object having a plurality of narrow and narrow slots.

1 is a schematic diagram of a cylindrical object in the manufacturing apparatus of the present application.
2 is an exemplary cross-sectional view of a cylindrical object in the manufacturing apparatus of the present application.
3 to 5 show examples of a cylindrical object.
6 shows the relationship between the outer diameter and length of the cylindrical object and the output of the magnetic field generating device in the manufacturing apparatus of the embodiment.

The present application will be described in detail through the following examples, but the scope of the present application is not limited by the following examples.

As the cylindrical object, a conventional stator for a motor was used. The material constituting the stator is mild steel, in which the absorption factor (κ) of the motor stator is about 2.0, the specific gravity (ρ) is about 7.9×10 ³ kg/m ³ , and the specific heat is about 0.45 kJ/ (kg×℃).

The outer radius (unit: m) and the inner radius (unit: m) of the motor stator required to heat the mild steel motor stator from about 25°C to 250°C within 600 seconds, and the As a result of substituting all the variables in Equation 1 to obtain the length (unit: m), the following Equation 4 could be derived:

[Equation 4]

2.67×10 ³ ×π×(R _o ² -R _i ² )×Ls ≤ P

Then, in the _{60% (R i = R o} × 0.6) of the inner radius (R _i) of the stator for a motor external radius (R _o) condition, the outer diameter of the stator (2R _o), length (L _s) And the maximum output (P) of the magnetic field generating device is shown in FIG. 6. Here, the upper limit of the maximum output was set to about 305 kW. The outer diameters and lengths of the four arbitrary points of the motor stator are indicated by a to d in FIG. 6.

Thereafter, the capacitance (C) of the magnetic field generating device is set within the range of approximately 0.1 to 1 μF, the radius of the solenoid coil is set to be approximately 0.01 m smaller than the inner radius of the stator, and the solenoid coil and the stator are When the length is set to be the same and the number of windings of the solenoid coil is set to an appropriate line (3 to 9 turns), if the design conditions of the stators at points a to d of Fig. 6 and the design conditions of the solenoid coil are satisfied It was confirmed whether the frequency range (100 to 1,000 kHz) for the purpose of the present application is implemented within the power range that the magnetic field generator can implement (400 kW or less), and the results are shown in Table 1 below.

Stator Solenoid coil Magnetic field generator Pole R _o
(m) L _s
(m) R _c
(m) L _c
(m) N
(-) L
(μH) P
(kW) C
(μF) frequency
(kHz) a 0.5 0.2 0.29 0.2 3 14.9 270 0.05 184 b 0.3 0.6 0.17 0.6 9 15.4 291 0.05 181 c 0.25 0.9 0.14 0.9 13 14.5 303 0.05 187 d 0.1 One 0.05 One 15 2.22 55 0.25 214

By setting the design conditions of the stator and the solenoid coil under the conditions specified in this application, the performance of the resin curing device (output and frequency of the magnetic field generator) that can cure the resin at high curing degree, high filling rate and high speed is realized. Can be expected.

1: border area
2: through space
3: slot on the edge
10: tubular object
100: stator for motor
101: slot of the stator
102: winding in slot

Claims (15)

Resin curing including a cylindrical object including a through space formed in a longitudinal direction and an edge portion having at least one slot formed in the longitudinal direction, a solenoid coil, and a magnetic field generator for applying an alternating current to the solenoid coil Device,
The cylindrical object, the solenoid coil, and the magnetic field generating device are formed to satisfy the following Equations 1 and 2:
[Equation 1]
P×t ≥ κ×π×(R _o ² -R _i ² )×L _s ×ρ×c×(TT _R )
[Equation 2]
100 kHz ≤{(L _c )/(4×π ³ ×μ ₀ ×N ² ×R _c ² ×C)} ^1/2 ≤ 1000 kHz
In Equations 1 and 2, P is the maximum output (unit: kW) of the magnetic field generating device, t is the time (unit: seconds) for the magnetic field generating device to apply an alternating current to the solenoid coil, and κ is a constant, Each is a number within the range of 0.1 to 20, π is the circumference, R _o is the outer radius (unit: m) of the cylindrical object, and R _i is the inner radius (unit: m) of the cylindrical object. , Ls is the length (unit: m) of the tubular object, c is the specific heat (unit: kJ/(kg×°C)) of the tubular object, and ρ is the density of the tubular object (unit: : kg/m ³ ), T is the temperature (unit: ℃) of the tubular object, T _R is room temperature (unit: ℃), L _c is the length (unit: m) of the solenoid coil, μ ₀ is a constant, 4×π×10 ^-7 H/m, N is the number of turns of the solenoid coil (no unit), R _c is the radius (unit: m) of the solenoid coil, and C is the magnetic field It is the capacitance of the generator (unit: μF). The method of claim 1,
A resin curing device in which the shape of the cut surface in the width direction of the edge portion is a ring shape. The method of claim 1,
A resin curing device made of mild steel, copper or aluminum as the material of the rim. The method of claim 1,
In the edge portion, a ratio (A/B) of the total area (A) of the cut surface in the width direction of the slot and the area (B) of the cut surface in the width direction of the edge portion is in the range of 0.01 to 0.2. The method of claim 3,
The number of slots formed in the edge portion is in the range of 4 to 100 resin curing device. The method of claim 1,
The cylindrical object is a resin curing device for a motor stator. The method of claim 1,
The resin curing apparatus in the range of 1 kW to 400 kW, wherein P of Formula 1 is. The method of claim 1,
In Equation 1, the ratio of R _i and R _o (R _i /R _o ) is in the range of 0.2 to 0.85. The method of claim 8,
In Equation 1, R _o is in the range of 0.05 m to 10 m. The method of claim 8,
The ratio of R _{i in} Formula 1 and R _c in Formula 2 (R _c /R _i ) is in the range of 0.5 to 0.99. The method of claim 10,
R _c in Formula 2 is a resin curing device in the range of 0.005 m to 8 m. The method of claim 1,
The resin curing device in which L _s in Formula 1 is in the range of 0.05 m to 10 m. The method of claim 1,
L _c in Formula 2 is a resin curing device in the range of 0.01 m to 15 m. The method of claim 1,
N in Formula 2 is a resin curing device in the range of 2 to 30. The method of claim 1,
C in Formula 2 is a resin curing device in the range of 0.01 μF to 1 μF.

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