JP6722931B1 - Thermal welding tip and thermal welding unit - Google Patents

Abstract

A space-saving heat-welding chip and a heat-welding unit capable of efficiently heating a portion to be melted provided on a resin-made component to a temperature higher than a prescribed temperature and rapidly cooling the member thereafter. I will provide a. SOLUTION: The heat-welding chip of the present invention is a heat-welding chip for melting and thermally crimping a part of a component when fixing the element to the resin-made component, and the heat-generating part having a substantially flat plate shape. And a pair of power receiving portions, the heat generating portion has a recess corresponding to the shape of the melted portion in the portion facing the melted portion of the component, and for cooling the element in the center of the heat generating portion. It has a central cooling hole and a peripheral hole between the central cooling hole of the heat generating part and the recess, and the width of the heat generating part in the direction perpendicular to the energization direction in which the current for heating the heat generating part flows is the width of the pair of power receiving parts. It is formed larger than the width. [Selection diagram] Figure 2

Description

The present invention relates to an apparatus for heat-sealing an element to a resin-made component by thermal caulking, and more particularly to a heat-welding chip for heating a resin-made component and a heat-welding unit equipped with the heat-welding chip.

When a sheet-shaped object to be fixed such as a resin film or cloth is fixed to a thermoplastic resin product, if the mass productivity, durability, and airtightness are required, the impulse welding method is used. Is used.

Here, when fixing a resin member and a member such as an element made of a different material, a protrusion that is a melted portion is provided on the resin member, and a hole is formed at a position corresponding to the protrusion of the member such as the element. After providing the projection with a hole of a member such as an element, heat and pressing force are applied to the tip of the protruding projection to crush the vicinity of the tip of the softened projection to separate the resin member and the element such as the element. Thermal fusion by fixing by heat crimping is known (Patent Document 1).

JP, 2007-253481, A

However, in such a heat fusion method, since it is necessary to provide holes in a member such as an element, there are restrictions on the shape, size, material, etc. of the heat fusion member.

Further, in order to increase the production efficiency of the heat welding step, it is desirable to efficiently heat the melted portion provided on the resin member to a temperature equal to or higher than the specified temperature, and then to cool the melted portion promptly. Be done.

In the invention of Patent Document 1, in order to efficiently heat the melted portion provided on the resin member to a prescribed temperature or higher, a plate-shaped member provided with a plurality of protrusions having spaces inside is heat-welded. Since it protrudes to the side of the member to be formed, there is a problem in that a space in the vertical direction is taken and the heat welding apparatus is enlarged.

In view of the problems of the prior art, an object of the present invention is to efficiently heat a melted portion provided on a resin component to a temperature above a specified value, and to cool the member thereafter quickly. (EN) It is possible to provide a space-saving heat-welding tip and a heat-welding unit.

In order to achieve the above object, the present invention provides
When fixing an element to a resin-made component, a heat-welded chip for melting and thermally caulking a part of the component,
A substantially flat plate-shaped heat generating part, and a pair of power supply parts provided at one end of the heat generating part and the opposite end thereof ,
In the portion where the heat generating portion faces the melted portion of the component, has a recess corresponding to the shape of the melted portion,
A central cooling hole for cooling the element is provided at the center of the heat generating portion,
A peripheral hole is provided between the central cooling hole and the recess of the heat generating portion,
In the case of the lateral width direction perpendicular width energizing direction a direction from one to the other of said pair of power supply portions in a plan view of the heat welding tip, the width of the heat generating portion of said pair of power supply unit characterized in that it is larger than the lateral width.

With such a configuration, it has a substantially flat plate space-saving shape, and the melted portion provided on the resin part can be efficiently heated to a temperature higher than the specified temperature. Since it is possible to suppress the non-uniform cooling of the heat generating part, it is possible to improve the production efficiency in the heat welding step.

Further, in the heat-welded tip of the present invention,
It is preferable that the heat generating portion has a rectangular shape, and the peripheral hole is provided on the way from the central cooling hole to each corner of the rectangle.

With such a structure, the melted portion provided on the resin component can be heated to a temperature higher than the specified temperature with a low applied current, and the member can be cooled promptly.

Further, in the heat-welded tip of the present invention,
It is preferable that the peripheral hole is formed at a position closer to the recess than the center from the end of the central cooling hole to the recess.

With such a configuration, the melted portion provided on the resin component can be heated to a temperature higher than the specified temperature with a lower applied current, and the member can be cooled quickly.

And the heat welding unit of the present invention is a heat welding unit including the above-mentioned heat welding tip,
The lower end portion is provided with the heat-welding tip and a pair of power feeding members for feeding power to the power feeding portion of the heat-welding tip,
The upper part has a fixing member for fixing the heat welding unit to the heat welding apparatus body, and the fixing member has a through hole provided in a direction toward the heat generating portion of the heat welding chip,
Between the fixed member and the pair of power supply members, a space member having a gas flow portion connected to the through hole,
The upper end of the through hole has a cooling pipe through which a gas for cooling the element flows,
A plurality of cooling holes for cooling the element may be provided on the heat generating portion side of the gas circulation portion.

By configuring the structure of the heat-welding unit having the heat-welding tip in this way, it is possible to save space and efficiently heat and cool the melted portion provided on the resin-made component. Can improve the production efficiency.

It is a perspective exploded view showing an example of a heat welding unit in the present invention. It is a figure which shows an example of the components and elements to which the present invention is heat-welded. It is a longitudinal section showing an example of a space member in the present invention. It is a top view which shows an example of the heat welding tip in this invention. It is a figure which shows the temperature rising test result (example) of a heat welding tip. It is a figure which shows the temperature rising test result (comparative example 1) of a heat welding tip. It is a figure which shows the temperature rising test result (comparative example 2) of a heat welding tip. It is a figure which shows the temperature rising test result (comparative example 3) of a heat welding tip.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is an exploded perspective view showing an entire heat welding unit according to an embodiment of the present invention. The heat-welding unit 1 has a heat-welding tip 10, which will be described in detail later, at the lower end portion thereof, and constitutes the main part of the heat-welding device.

The thermal welding unit 1 has a fixing member 3 on its upper portion, and the fixing member 3 has an upright fixing portion for fixing to a main body of the thermal welding apparatus (not shown). Further, the fixing member 3 has a through hole 3a formed in the center thereof in a direction toward the heat generating portion 11 of the heat-welding tip 10 described later. A cooling pipe 5 through which a gas for cooling the component 6 and the element 8 flows is fitted in the upper end portion of the through hole 3a, and the cooling pipe 5 is connected to a cooling air supply device (not shown) of the heat welding device body. linked.

The two power feeding members 2 are fixed to the fixing member 3 via the space member 4, and the heat-welded chip 10 is fixed between the central portions of the two power feeding members 2. Each of the two power supply members 2 is connected to a power supply device (not shown) of the main body of the heat welding device, and the heat welding chip 10 generates heat when receiving power from the power supply device. Therefore, the feeding member 2 needs to be a conductor and the space member 4 needs to be an insulator. Since the heat-welded chip 10 may be consumed, it can be replaced during the heat-welding process for each constant production amount, and the position reproducibility after replacement can be ensured.

Further, in the present embodiment, a substantially rectangular plate-shaped insulating member 7 made of an insulating material and fixed to the space member 4 is provided between the two power feeding members 2. The insulating member 7 is made of a material having heat resistance, heat insulation, and insulation, has a circular hole in the center, and has a function of suppressing the heat-welded chip 10 from the back side to prevent deformation.

FIG. 1B is a diagram showing an example of a state in which the element 8 is fitted in the component 6 before heat welding. In the present embodiment, the melted portion 6a is provided so as to protrude a certain amount above the upper surface of the element 8 and surround a part of the edge portion of the element 8. As a result, it is not necessary to provide a hole in the element 8, so that the degree of freedom of the shape, size, material, etc. of the heat-weldable member is increased. The melted portion 6a may be provided at any position according to the shape of the element 8.

FIG. 1C is a vertical sectional view of the space member 4. The space member 4 is provided with a gas circulation portion 4a connected to the through hole 3a, and a plurality of cooling holes 4b for cooling the component 6 to which the element 8 is heat-welded is provided on the heat generation portion 11 side of the gas circulation portion 4a. have. A central rod 4c for fixing the element 8 when the component 6 is heat-welded is fixed to the lower portion of the space member 4. The position of the central rod 4c is precisely adjusted according to the shapes of the parts 6 and the element 8 to be heat-welded.

In the heat crimping step, the melted portion 6a of the component 6 on which the element 8 is placed is heated by applying an electric current to the heat welded chip 10 through the power feeding member 2, and the melted portion 6a is formed in the recess 13 of the heat weldable chip 10. After pressing the element 8 to the component 6 by heat caulking, the heat welding tip 10 is cooled by the cooling air that has passed through the cooling pipe 5, the through hole 3a, the gas circulation portion 4a, and the cooling hole 4b. The component 6 and the element 8 are cooled by the cooling. The voltage applied to the heat welding tip 10 is usually 10 V or less. Here, the number, hole shape, layout, and cross-sectional shape of the cooling holes 4b are not particularly specified, and may be appropriately selected in consideration of the efficiency of the cooling air and the strength of the space member 4.

FIG. 2 is a plan view showing a heat-welded chip according to an embodiment of the present invention, and is a view seen from the lower surface side (part 6 side) of FIG. The heat-welding chip 10 has a substantially flat plate-shaped heat generating portion 11 at the center thereof and a pair of power feeding portions 12 at both ends thereof. In the present embodiment, the power feeding portion 12 is also substantially flat, and the heat generating portion 11 and the power feeding portion 12 are integrated and have the same thickness.

The heat generating portion 11 has a concave portion 13 corresponding to the shape of the melted portion 6a at a portion facing the melted portion 6a of the component 6, and the heat generating portion 11 has an oval central cooling at the center thereof. It has a hole 14. The surface of the heat generating portion 11 that does not face the component 6 has a planar shape with no unevenness. The central cooling hole 14 is for efficiently cooling the heat-welded chip 10, and further the component 6 and the element 8 by the cooling air that has passed through the cooling pipe 5, the through hole 3a, the gas flow portion 4a, and the cooling hole 4b. is there.

The recessed portion 13 is formed corresponding to the shape of the melted portion 6a of the component 6, and is basically formed over the entire area (entire circumference) of the melted portion, but if necessary, it should be formed according to the shape of the melted portion. It may be formed by connecting parts. The cross-sectional shape of the recess 13 is not particularly limited, and may be appropriately selected from rectangular, trapezoidal, semicircular, and the like.

Further, peripheral holes 15 are provided on the way from the central cooling hole 14 of the rectangular heat generating portion 11 to each corner of the rectangle. Here, the peripheral hole 15 is formed at a position closer to the recess 13 than the center from the end of the central cooling hole 14 to the recess 13. The peripheral hole 15 controls the current flowing through the heat-generating portion 11 of the heat-welded chip 10 to make the temperature of the heat-generating portion 11 uniform, and also contributes to the cooling of the component 6 and the element 8.

The central cooling hole 14 is preferably circular, elliptical, or oval, and the diameter (major axis) of the central cooling hole 14 is 20% or more and 40% or less of the width of the heat generating portion in the direction perpendicular to the energization direction. Is preferred. Here, when the central cooling hole 14 is formed into an elliptical shape or an elliptical shape, it is preferable that the major axis thereof be in the energizing direction, and the peripheral hole 15 is preferably circular in terms of workability and heat resistance.

In the present embodiment, the width of the heat generating portion 11 in the direction perpendicular to the energization direction is formed larger than the width of the power feeding portion 12, which also makes the heat generating portion 11 of the heat-welded chip 10 uniform in temperature rise and decrease. Contribute to. In order to obtain such uniform heating and cooling of the heat generating portion 11, it is preferable to make the width of the heat generating portion 11 in the direction perpendicular to the energization direction larger than the width of the power feeding portion 12 by 10% or more. In the present embodiment, the width of the heat generating portion 11 in the direction perpendicular to the energization direction is 12 mm, and the width of the power feeding portion 12 is 7 mm, so that the width of the heat generating portion 11 is about 70% larger than the width of the power feeding portion 12.

3A to 3D are explanatory views showing the heating test results of the heat-welded tip.

(Example)
FIG. 3A is an embodiment of the present invention, in which the heat-welded tip 10 shown in FIG. 2 is viewed from the lower surface side (part 6 side) of FIG. It shows the temperature rise of the part 11.

Here, the heat generating portion 11 has a planar shape of about 12 mm×12 mm and a thickness of 0.3 mm. The central cooling hole 14 is an oval, and the length in the energization direction is 6 mm, the width in the same vertical direction is 3 mm, and the aspect ratio of the oval is 2:1. The four peripheral holes 15 are each circular with a diameter of 1.5 mm. When an alternating current is applied to the heat-welded chip 10 via the power supply member 2 at 80 A and 3 V for 10 seconds, the maximum temperature in the surface of the heat generating portion 11 is 230° C. (point A) and the minimum temperature is 220° C. (point B). Then, a uniform and sufficient temperature rise was observed.

(Comparative Example 1)
FIG. 3B is a comparative example of the present invention, and shows the temperature rise of the heat generating part when an energization test is performed as in the example. In this comparative example, the width of the heat generating portion and the width of the power feeding portion in the direction perpendicular to the energization direction are formed to be the same width.

Here, the planar shape of the heat generating portion is approximately 12 mm×12 mm, and the thickness is 0.3 mm. The cooling hole in the center is an ellipse, and the length in the energizing direction is 6 mm, the width in the same vertical direction is 3 mm, and the aspect ratio of the ellipse is 2:1. Each of the four peripheral holes has a circular shape with a diameter of 1.5 mm. When an alternating current was applied to this heat-welded chip via a power supply member at 80 A, 3 V for 10 seconds, the maximum temperature in the surface of the heat generating part was 230° C. (point C) and the minimum temperature was 140° C. (point D), which were uniform. No significant temperature rise was observed.

(Comparative example 2)
FIG. 3C is another comparative example of the present invention, and shows the temperature rise of the heat generating portion when the same energization test is performed.

This heat-welded chip has only a circular central cooling hole in the center of the heat generating portion, and the width of the power feeding portion in the direction perpendicular to the energizing direction is smaller than the width of the heat generating portion. Similar to the embodiment, the planar shape of the heat generating portion is approximately 12 mm×12 mm, the thickness is 1.0 mm, the width of the power feeding portion is 7 mm, and the diameter of the central cooling hole is 5 mm. When an alternating current of 180 A and 3 V was applied for 10 seconds to this heat-welded chip through a power supply member, the maximum temperature in the surface of the heat generating part was 240°C (point E) and the minimum temperature was 200°C (point F), which was uniform. No significant temperature rise was observed. Here, even if the thickness of the heat generating portion is reduced as in Example and Comparative Example 1 and the heating time is extended to 20 seconds, the temperature rise cannot be made uniform, and the required applied current value is 180A. It was bigger than

(Comparative example 3)
FIG. 3E shows still another comparative example of the present invention, and shows the temperature rise of the heat generating portion when the same electric current test is performed.

This heat-welded chip has only circular peripheral holes at the four corners of the heat generating portion, and the width of the heat generating portion and the width of the power feeding portion in the direction perpendicular to the current-carrying direction are formed to be the same width. Similar to the embodiment, the plane shape of the heat generating portion is approximately 12 mm×12 mm, the thickness is 2.0 mm, and the diameter of the peripheral hole is 2 mm. When an alternating current of 200 A and 3 V was applied for 10 seconds to the heat-welded chip via a power supply member, the maximum temperature in the surface of the heat generating part was 240° C. (point G) and the minimum temperature was 180° C. (point H), which was uniform. No significant temperature rise was observed. Also in this case, even if the thickness of the heat generating portion was reduced as in Example and Comparative Example 1, uniform heating could not be achieved, and the required applied current value was larger than in Examples.

As described above, the central cooling hole 14 for cooling the element 8 is provided at the center of the heat generating portion 11, and the peripheral hole 15 is provided between the central cooling hole 14 of the heat generating portion 11 and the concave portion 13. The element 8 is fixed to the resin-made component 6 by using the heat-welding chip 10 in which the width of the heat generating portion 11 in the direction perpendicular to the energizing direction in which the current for heating the is flowing is larger than the width of the pair of power feeding portions 12. By performing the heat crimping, the temperature of the heat generating part 11 can be uniformly increased with a lower applied current, and the temperature of the heat generating part 11 can be quickly lowered after the energization is stopped. Therefore, the production efficiency in the heat welding step can be improved and energy saving can be achieved, and if the heat welding chip 10 having a substantially flat plate shape is mounted on the heat welding unit 1, the heat welding chip 10 does not take a space in the vertical direction, so The welding device can be downsized.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto. For example, in the present embodiment, the heat generating portion 11 has a flat surface on both sides, but a gentle concave portion may be provided around the central cooling hole 14 of the heat generating portion 11 in accordance with the shapes of the parts 6 and the elements 8 to be heat-welded. It is possible.

Further, in the embodiment of the present invention, the heat generating portion 11 and the power feeding portion 12 of the heat-welded chip 10 have the same thickness, but the same effect can be obtained even if the thickness of the heat generating portion 11 is thinner than that of the power feeding portion 12. Not to mention playing.

DESCRIPTION OF SYMBOLS 1 Thermal welding unit 2 Power feeding member 3 Fixing member 3a Through hole 4 Space member 4a Gas distribution part 4b Cooling hole 5 Cooling pipe 10 Thermal welding chip 11 Heat generating part 12 Power feeding part 13 Recess 14 Central cooling hole 15 Peripheral hole

Claims (4)

When fixing an element to a resin-made component, a heat-welded chip for melting and thermally caulking a part of the component,
A substantially flat plate-shaped heat generating part, and a pair of power supply parts provided at one end of the heat generating part and the opposite end thereof ,
In the portion where the heat generating portion faces the melted portion of the component, has a recess corresponding to the shape of the melted portion,
A central cooling hole for cooling the element is provided at the center of the heat generating portion,
A peripheral hole is provided between the central cooling hole and the recess of the heat generating portion,
In the case of the lateral width direction perpendicular width energizing direction a direction from one to the other of said pair of power supply portions in a plan view of the heat welding tip, the width of the heat generating portion of said pair of power supply unit heat welding tip, characterized in that it is formed larger than the width. The heat-welded chip according to claim 1,
The heat-welding chip is characterized in that the heat generating portion has a rectangular shape, and has the peripheral holes in the middle of the central cooling hole toward each corner of the rectangle. The heat-welded chip according to claim 2,
The thermal welding chip, wherein the peripheral hole is formed at a position closer to the recess than the center from the end of the central cooling hole to the recess. A thermal welding unit comprising the thermal welding tip according to any one of claims 1 to 3,
The lower end portion is provided with the heat-welding tip and a pair of power feeding members for feeding power to a power feeding portion of the heat-welding tip,
The upper part has a fixing member for fixing the heat welding unit to the heat welding apparatus body, and the fixing member has a through hole provided in a direction toward the heat generating portion of the heat welding chip,
Between the fixing member and the pair of power supply members, a space member having a gas flow portion connected to the through hole,
The upper end of the through hole has a cooling pipe through which a gas for cooling the element flows,
A heat welding unit comprising a plurality of cooling holes for cooling the element on the heat generating portion side of the gas circulation portion.

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