JP2012115802A - Method for solidification of coating material and method of manufacturing coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for solidification of a coating material, capable of preventing the defects of a coating film caused by adhesion of dust and a method of manufacturing a coil.SOLUTION: According to the method for solidification of a coating material, as the coating material can be heated by radiating heat from an inside face of a groove shaped heat generating body 35 adjacent to an electromagnetic coil W with an interval therebetween with respect to a profile portion when the electromagnetic coil W is seen from its winding axial direction, the defects of the coating film caused by adhesion of dust can be prevented, and a high quality insulated film without coating film defects can be formed into the electromagnetic coil W.

Description

  The present invention relates to a paint solidifying method for heating and solidifying a paint on the surface of a workpiece, and a coil manufacturing method using the paint solidifying method.

  As a conventional paint solidification method of this type, there is known one in which a paint is heated and solidified by hot air blown from the inner surface of a heating furnace (for example, see Patent Document 1).

JP 2003-236437 A ([0035] to [0036], FIG. 3)

  However, the conventional paint solidifying method described above has a problem that dust wound up with hot air adheres to the painted surface and causes a coating film defect.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a coating solidification method and a coil manufacturing method capable of preventing coating film defects due to adhesion of dust.

  The paint solidifying method according to the invention of claim 1 made to achieve the above object is a paint solidifying method in which the surface of the work is covered with a paint, and then the paint on the surface of the work is heated to dry or harden. A groove heater with an inner surface adjacent to the contour when the workpiece is viewed from a certain direction is provided, the groove heater is heated, and the workpiece is loosely fitted in the groove heater. It is characterized in that it moves in the longitudinal direction of the groove heater in the state of being heated and heats the paint.

  According to a second aspect of the present invention, in the paint solidifying method according to the first aspect, the groove heater is configured such that the IH coil is disposed outside the metal groove heating element, and the groove heating element is formed by the IH coil. It is characterized by induction heating.

  According to a third aspect of the present invention, in the paint solidifying method according to the second aspect, the temperature inside the groove-shaped heating element is measured, and the current value or frequency of the alternating current flowing through the IH coil is changed based on the measured temperature to change the groove-shaped heating It is characterized by adjusting the exothermic temperature of the body.

  According to a fourth aspect of the present invention, in the paint solidification method according to any one of the first to third aspects, the coil is an electromagnetic coil, and the coating is dried or cured to cover the electromagnetic coil. It has a feature in the place.

  The invention of claim 5 is the paint solidifying method according to claim 4, wherein both end portions of the electromagnetic coil are formed in a structure projecting in the same direction from the wound portion, and the groove heater is a square groove structure, A feature is that the paint is heated with the longitudinal direction of the groove heater aligned with the winding axis direction of the winding part and the three inner surfaces of the groove heater being adjacent to the winding part from three sides. Have.

  A sixth aspect of the invention is characterized in that, in the paint solidifying method according to the fifth aspect, the winding portion of the electromagnetic coil has a quadrangular shape when viewed from the winding axis direction.

  According to a seventh aspect of the present invention, there is provided a method for manufacturing a coil comprising: coating a surface of a workpiece with a paint; and heating the paint by the paint solidifying method according to any one of the fourth to sixth aspects. It is characterized in that a surface-coated electromagnetic coil is manufactured.

[Invention of Claim 1]
According to the invention of claim 1, since the paint can be heated by the radiant heat from the inner surface of the adjacent groove heater with a gap with respect to the contour portion when the work is viewed from a certain direction, The paint can be effectively heated while preventing coating film defects due to adhesion of dust to the painted surface. Here, the groove heater may have a configuration in which the paint is heated by infrared rays, or a structure in which the groove heating element is inductively heated by the IH coil and the paint is heated by the radiant heat as in the invention of claim 2. Good.

[Invention of claim 3]
According to the invention of claim 3, the paint can be heated at an appropriate temperature.

[Inventions of Claims 4 and 7]
According to the fourth and seventh aspects of the present invention, a high-quality insulating film free from coating film defects due to adhesion of dust can be formed on the surface of the electromagnetic coil.

[Invention of claim 5]
According to invention of Claim 5, the coating material which covered the winding part can be heated from three directions orthogonal to the winding axis direction of an electromagnetic coil.

[Invention of claim 6]
According to the invention of claim 6, among the quadrangle of the winding portion of the electromagnetic coil, the side surfaces of the three sides can be along the three inner side surfaces of the groove heater, and the paint can be heated effectively. .

1 is a side sectional view of a paint solidifying apparatus according to an embodiment of the present invention. Front view of front heating area Front view of rear heating area Perspective view of electromagnetic coil Front view in the latter heating area of the paint solidifying apparatus according to the modification

  Hereinafter, an embodiment of a paint solidifying apparatus 10 to which the present invention is applied will be described with reference to FIGS. The metal workpiece exemplified in this embodiment is, for example, an electromagnetic coil W for a motor and is shown in FIG. As shown in the figure, the electromagnetic coil W winds a copper wire having a flat cross section so that it becomes a square when viewed from the winding axis direction, and a pair of terminal portions Wb, Wb are squares of the winding portion Wa. It has a structure that protrudes linearly from one side in the same direction. The surface of the winding portion Wa is covered with a paint by, for example, electrodeposition coating. On the other hand, the pair of terminal portions Wb and Wb are not covered with paint and the copper wire is exposed.

  The electromagnetic coil W in which the winding portion Wa is covered with the unsolidified paint is conveyed by the conveyor 30 to the paint solidifying apparatus 10 of the present invention. The conveyor 30 is integrally provided with chuck jigs 31 and 31 that hold the electromagnetic coil W with the winding portion Wa facing upward. Moreover, the conveyor 30 is comprised with the insulating member, for example, performs the tact conveyance (intermittent conveyance) which repeats advancing and a stop.

  The chuck jigs 31 and 31 are made of a metal (for example, iron or stainless steel) having an electric resistance larger than that of the copper wire constituting the electromagnetic coil W, and a pair of terminal portions where the copper wire is exposed in the electromagnetic coil W. Wb and Wb are gripped. Further, the chuck jigs 31, 31 hold the electromagnetic coil W so that the winding axis of the winding part Wa is parallel to the conveying direction by the conveyor 30.

  The paint solidifying device 10 extends linearly along the conveying direction of the electromagnetic coil W. Specifically, the paint solidifying device 10 includes a heating furnace 11 having a rectangular tube-shaped tunnel structure, and a front heating area AR1 is provided on the side of the heating furnace 11 close to the carry-in port 11A, and the carry-out port 11B has A rear heating area AR2 is provided on the near side.

  In the heating furnace 11, a plurality of IH (induction heating) coils 13 and 13 are provided on the inner surface of the preceding heating area AR <b> 1 along the conveying direction of the electromagnetic coil W. As shown in FIG. 2, the IH coils 13 and 13 are provided in both sides of the heating furnace 11 in the width direction orthogonal to the conveying direction of the electromagnetic coil W. In addition, these IH coils 13 and 13 are provided with an interval corresponding to one forward distance in tact conveyance in the conveyance direction of the electromagnetic coil W (see FIG. 1). 13 and the chuck jigs 31, 31 are temporarily stopped at adjacent positions.

  When a high frequency current is passed through the IH coils 13 and 13 in a state where the chuck jigs 31 and 31 and the IH coils 13 and 13 are adjacent to each other, the chuck jigs 31 and 31 are induction-heated. In addition, since the conveyor 30 is comprised with the insulating member, it does not generate | occur | produce heat.

  Radiation thermometers 14 and 14 are provided at positions where the IH coils 13 and 13 are arranged in the front heating area AR1. The radiation thermometers 14 and 14 can measure the temperature of the pair of terminal portions Wb and Wb in the electromagnetic coil W in a non-contact manner, and based on the measurement result, the heating furnace control unit 12 causes the electromagnetic coil W ( The temperature of the chuck jigs 31, 31) is automatically adjusted. Specifically, the current value or frequency of the high-frequency power source connected to the IH coils 13 and 13 is adjusted, and for example, the temperature of the electromagnetic coil W (chuck jigs 31 and 31) gradually increases as it advances through the preceding heating area AR1. Automatically adjusted to do.

  In the heating furnace 11, a groove-shaped heating element 35 is disposed inside the rear heating area AR2. As shown in FIG. 3, the groove-shaped heating element 35 has a square groove-shaped structure extending in parallel with the heating furnace 11, and the winding portion Wa of the electromagnetic coil W is idled inside the groove-shaped heating element 35. In the fitted state, the groove-shaped heating element 35 moves in the longitudinal direction. In detail, the groove-shaped heating element 35 is adjacent to the contour portion of the winding portion Wa having a quadrangular shape when the electromagnetic coil W is viewed from the winding axis direction with a predetermined gap from three sides. It has an inner surface.

  The groove-shaped heating element 35 is made of, for example, a metal (for example, iron, stainless steel, etc.) having a larger electric resistance than the electromagnetic coil W. A plurality of IH coils 36 and 36 are provided on the inner surface of the heating furnace 11 so as to be close to the outer surface of both side walls and the outer surface of the ceiling wall in the width direction of the groove-shaped heating element 35. Further, at least a portion of the heating furnace 11 corresponding to the rear heating area AR2 has a heat insulating structure. For example, the whole is made of a heat insulating material, or the heat insulating material is lined on the inner surface. The groove-shaped heating element 35 and the IH coil 36 constitute the “groove-shaped heater” of the present invention.

  As shown in FIG. 3, a temperature sensor 22 for measuring the temperature of the groove-shaped heating element 35 is provided at a predetermined position in the rear heating area AR2. Based on the measurement result, the heating furnace control unit 12 automatically adjusts the heat generation temperature of the channel heating element 35. For example, the value or frequency of the alternating current supplied to the IH coils 36 and 36 is adjusted so that the heat generation temperature of the groove-shaped heat generating element 35 increases as it proceeds through the subsequent heating area AR2.

  Next, operation | movement of the coating material solidification apparatus 10 of this embodiment is demonstrated. The electromagnetic coil W in which the surface of the winding portion Wa is covered with the paint in the electrodeposition coating process, the terminal portions Wb and Wb are gripped by the chuck jigs 31 and 31, and the heating furnace is opened from the carry-in port 11A. 11 and is heated while being tact-conveyed in the order of the front heating area AR1 and the rear heating area AR2.

  In the pre-stage heating area AR1, the chuck jigs 31, 31 are induction-heated by the IH coils 13, 13, and the heat is transferred to the copper wire constituting the electromagnetic coil W. Thereby, the coating material which covered the surface of the electromagnetic coil W is heated from the inner side (electromagnetic coil W side). Further, as the process proceeds through the preceding heating area AR1, the current value or frequency of the IH coil 13 increases, the temperature of the chuck jigs 31, 31 increases, and accordingly, the temperature of the electromagnetic coil W also increases. And the water | moisture content and solvent which are contained in a coating material evaporate by the heating in the front | former stage heating area AR1, and are volatilized from the outer surface of the unsolidified coating material.

  In the subsequent heating area AR2 subsequent to the preceding heating area AR1, the groove-shaped heating element 35 is induction-heated by passing a high-frequency current through the IH coils 36, 36, and the electromagnetic coil W The coating covering the surface is heated from the outside. In addition, the heating temperature of the electromagnetic coil W (groove heating element 35) is automatically adjusted based on the temperature of the groove heating element 35 measured by the temperature sensor 22. Even during heating in the rear heating area AR2, the paint is heated from the inside by the residual heat of the electromagnetic coil W. Then, by moving within the heating furnace 11 over a predetermined time, the paint on the surface of the electromagnetic coil W is completely solidified and an insulating film is formed.

  As described above, according to the present embodiment, the paint is generated by the radiant heat from the inner surface of the adjacent groove-shaped heating element 35 with a gap with respect to the contour portion when the electromagnetic coil W is viewed from the winding axis direction. Therefore, it is possible to effectively heat the paint while preventing coating film defects due to adhesion of dust, and to form a high-quality insulating film without coating film defects on the electromagnetic coil W. . Moreover, since the heating furnace 11 has a heat insulating structure, power consumption can be reduced.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, the pre-heating area AR1 for heating the paint covering the electromagnetic coil W from the inside is provided. However, only the heating by the groove-shaped heating element 35 is performed without providing the pre-heating area AR1. The paint may be solidified.

  (2) In the above embodiment, after the heating from the inside of the paint by induction heating of the chuck jigs 31, 31, the heating from the outside of the paint by induction heating of the groove-shaped heating element 35 is performed. Heating from the inside and outside of the paint may be performed simultaneously.

  (3) In the above embodiment, heating is performed while the electromagnetic coil W is transported in the heating furnace 11 in a tact manner. However, heating may be performed while transporting the heating coil 11 at a constant speed.

  (4) In the above embodiment, the electromagnetic coil is exemplified as the “work”, but the work is not limited to the electromagnetic coil. The paint is not limited to the one for forming the insulating film, and may be a rust preventive or decorative paint.

  (5) In the above embodiment, the winding axis direction of the electromagnetic coil W and the conveyance direction of the electromagnetic coil W by the conveyor 30 are parallel to each other. However, as shown in FIG. You may make it convey the electromagnetic coil W in the direction orthogonal to the protrusion direction of an axis | shaft and a pair of terminal part Wb and Wb. In this case, the inner side surface of the groove-shaped heating element 35 is an outline portion when the winding portion Wa is viewed from a direction orthogonal to the winding axis of the electromagnetic coil W and the protruding direction of the pair of terminal portions Wb and Wb. What is necessary is just to make a clearance and adjoin.

10 Paint Solidifying Device 22 Temperature Sensor 35 Channel Heating Element 36 IH Coil W Electromagnetic Coil (Workpiece)
Wa winding part Wb terminal part

Claims (7)

In the paint solidification method in which the surface of the work is covered with a paint, and then the paint on the surface of the work is heated to dry or harden,
A grooved heater having an inner surface adjacent to the contour portion when the workpiece is viewed from a certain direction with a gap is provided,
A paint solidification method characterized by heating the paint by moving the groove heater in the longitudinal direction of the groove heater in a state where the groove heater generates heat and the work is loosely fitted in the groove heater.   2. The paint according to claim 1, wherein the groove heater is configured such that an IH coil is disposed outside a metal groove heating element, and the groove heating element is induction-heated by the IH coil. Solidification method.   The temperature of the groove-shaped heating element is measured, and the heating temperature of the groove-shaped heating element is adjusted by changing the value or frequency of the alternating current flowing through the IH coil based on the temperature. The method of solidifying a paint according to 1.   4. The solidified paint according to claim 1, wherein the coil is an electromagnetic coil, and the paint is dried or cured to become an insulating film that covers the electromagnetic coil. 5. Method. Both end portions of the electromagnetic coil are formed in a structure protruding in the same direction from the wound portion,
The groove heater has a square groove structure, the winding axis direction of the winding portion is along the longitudinal direction of the groove heater, and the three inner surfaces of the groove heater are adjacent to the winding portion from three sides. The paint solidification method according to claim 4, wherein the paint is heated in a heated state.   6. The paint solidification method according to claim 5, wherein the winding portion of the electromagnetic coil is wound in a square shape when viewed from the winding axis direction.   After the surface of the electromagnetic coil is covered with a paint, the paint is heated by the paint solidifying method according to any one of claims 4 to 6 to produce an electromagnetic coil whose surface is covered with the paint. Coil manufacturing method characterized by performing.