JP5808984B2 - Thermoforming machine for parts for electroacoustic transducers - Google Patents

Description

  The present invention relates to a thermoforming machine for electroacoustic transducer parts that forms a cone, a damper, or the like of a speaker by applying pressure and heat to a workpiece using a heated mold.

  As an example of a conventional thermoforming machine for parts for electroacoustic transducers, a heat press machine for forming a speaker cone will be described with reference to FIG. FIG. 6 is a sectional view seen from the front of a conventional hot press.

  In the figure, a lower heater plate 3 for heating the lower mold 1 is provided on the lower surface of the lower mold 1. A lower die set plate 5 that supports the lower mold 1 and the heater plate 3 is provided below the lower heater plate 3 through a space.

  An upper mold 7 facing the lower mold 1 is disposed above the lower mold 1. An upper heater plate 9 for heating the upper mold 7 is provided on the upper surface of the upper mold 7. An upper die set plate 11 that supports the upper mold 7 and the heater plate 9 is provided above the upper heater plate 9 through a space.

  The lower die set plate 5 is provided with a guide 13 for guiding the upper die set plate 11 in the vertical direction.

  The upper die set plate 11 is driven in the vertical direction by a drive unit (not shown).

  Next, the operation of the above configuration will be described. In a state where there is a space between the upper mold 7 and the lower mold 1, a workpiece is set on the lower mold 1, and the upper die set plate 11 is moved downward by a drive unit (not shown). Let Then, by applying strong force and heat to the workpiece with the upper mold 7 and the lower mold 1, the same shape as the mold is created in the workpiece (for example, see Patent Document 1).

  In general, heat insulation of a mold of a hot press machine is performed by directly winding a heat insulating material such as glass wool around the mold.

JP 2003-103322 A (FIG. 1)

  There are three forms of heat loss from the mold: convective heat transfer to air, radiant heat transfer, and heat conduction to the press. Of this, 75% is due to radiant heat transfer.

  On the other hand, heat insulation in which a conventional heat insulating material is directly wound around a mold is effective for reducing heat conduction, but is hardly effective for radiant heat transfer. Therefore, there is a problem that heat loss from the mold is large and power consumption is large.

  This invention is made | formed in view of the said problem, The subject is providing the heat press machine of the components for electroacoustic transducers which consumes less electric power.

The invention according to claim 1 to solve the problem, and the mold, a heater plate for heating the mold, the mold, the for the heater plates provided with the air, the mold, the heater A thermoforming machine for parts for an electroacoustic transducer, comprising: a reflector that covers the entire outer surface of the plate .

According to a second aspect of the present invention, the mold includes a lower mold and an upper mold disposed above the lower mold and facing the lower mold. The heater plate includes: A lower heater plate that is provided on the lower surface of the lower mold and that heats the lower mold; and an upper heater plate that is provided on the upper surface of the upper mold and that heats the upper mold; and A lower die plate, a lower die set plate that supports the heater plate, and a lower die set plate that supports the heater plate, and a space above the upper heater plate, An upper die set plate that supports the upper die, the heater plate, a guide that is provided on the lower die set plate and guides the upper die set plate in the vertical direction, and the upper die set plate is It has a drive unit for driving in the direction, and the reflection plate, the lower mold, the lower heater plate, wherein the upper mold, through the space provided for the entire area of the outer surface of the upper heater plate The thermoforming machine for parts for electroacoustic transducers according to claim 1, wherein:

  According to a third aspect of the present invention, the reflector is provided between the lower heater plate and the lower die set plate, and a lower back reflector that covers the lower surface of the lower heater plate through a space; An upper back reflector provided between the upper heater plate and the upper die set plate and covering the upper surface of the upper heater plate with a space therebetween; a lower mold; and a side portion of the lower heater plate. A cylindrical lower side reflector that covers through the space, and a cylindrical upper side reflector that covers the upper mold and the side of the upper heater plate through the space. It is a thermoforming machine of the components for electroacoustic transducers of Claim 2.

  The invention according to claim 4 is the electroacoustic transducer according to any one of claims 1 to 3, wherein the material of the surface of the reflector is any one of gold, silver, copper, and aluminum. This is a thermoforming machine for parts.

  The invention according to claim 5 is the electroacoustic according to any one of claims 1 to 4, wherein the reflector comprises a frame and an aluminum foil that is detachably attached to the frame. This is a thermoforming machine for converter parts.

According to the invention of claim 1-5, by having a reflector that covers the entire outer surface of the mold and the heater plate, radiant heat transfer from the mold and the heater plate is reflected by the reflector, Since the mold and the heater plate are returned, heat loss from the mold and the heater plate is reduced, and the power consumption is reduced.

According to the invention of claim 2,
The reflecting plate is provided through a space with respect to the entire outer surface of the lower mold, the lower heater plate, the upper mold, and the upper heater plate, so that the lower mold, the lower mold, Radiation heat transfer from the heater plate, upper mold, and upper heater plate is reflected by the reflector and returns to the lower mold, lower heater plate, upper mold, and upper heater plate. Heat loss from the heater plate, upper mold, and upper heater plate is reduced, and power consumption is reduced.

  According to the invention of claim 3, the reflector is provided between the lower heater plate and the lower die set plate, and the lower back reflection that covers the lower surface of the lower heater plate through the space. A plate, an upper back reflector provided between the upper heater plate and the upper die set plate and covering the upper surface of the upper heater plate with a space therebetween, a lower mold, and a side of the lower heater plate A cylindrical lower side reflector that covers a portion through a space, and a cylindrical upper side reflector that covers a side of the upper mold and the upper heater plate via a space, The side mold, the lower heater plate, the upper mold, and the upper heater plate are completely covered with the lower mold, the lower heater plate, the upper mold, and the upper heater plate. Therefore, radiant heat transfer from the lower mold, the lower heater plate, the upper mold, and the upper heater plate is reflected by these reflecting plates, and is reflected on the lower mold, the lower heater plate, the upper mold, and the upper heater plate. Since it returns, the heat loss from the lower mold, the lower heater plate, the upper mold, and the upper heater plate is reduced, and the power consumption is reduced.

  According to the invention which concerns on Claim 4, the material of the surface of the said reflecting plate is any one of gold | metal | money with high reflective efficiency, silver, copper, and aluminum, A lower mold, a lower heater plate, Heat loss from the upper mold and the upper heater plate is reduced, and power consumption is reduced.

  According to the invention which concerns on Claim 5, even if the darkening generate | occur | produces on the surface of a reflecting plate, the said reflecting plate consists of a frame and the aluminum foil stretched | detached with respect to this frame, Easy to replace.

It is sectional drawing which looked at the hot press machine of embodiment from the front. It is a disassembled perspective view of the principal part of FIG. It is a figure which shows the change of the electric power used of the conventional heat press machine. It is a figure which shows the change of the electric power used when a lower side reflector, an upper side reflector, a lower back reflector, and an upper back reflector are attached. It is a figure explaining the effect of a reflecting plate. It is sectional drawing seen from the front of the conventional heat press machine.

  As an example of a thermoforming machine for parts for electroacoustic transducers, a hot press machine for forming a speaker cone will be described. FIG. 1 is a cross-sectional view of a heat press machine for parts of an electroacoustic transducer according to an embodiment as viewed from the front, and FIG.

  In these drawings, a cylindrical lower heater plate 53 for heating the lower mold 51 by electricity is provided on the lower surface of the cylindrical lower mold 51. A lower die set plate 55 that supports the lower mold 51 and the heater plate 53 is provided below the lower heater plate 53 through a space. Specifically, the lower heater plate 53 is provided on the lower die set plate 55 via a spacer 54, and a space is interposed between the lower heater plate 53 and the lower die set plate 55.

  A cylindrical upper mold 57 facing the lower mold 51 is disposed above the lower mold 51. A cylindrical upper heater plate 59 for heating the upper mold 57 is provided on the upper surface of the upper mold 57. An upper die set plate 61 that supports the upper mold 57 and the heater plate 59 is provided above the upper heater plate 59 through a space. Specifically, the upper heater plate 59 is provided on the upper die set plate 61 via the spacer 60, and a space is interposed between the upper heater plate 59 and the upper die set plate 61.

  The lower die set plate 55 is provided with a guide 13 for guiding the upper die set plate 61 in the vertical direction.

  The upper die set plate 61 is driven in the vertical direction by a drive unit (not shown).

  Next, the operation of the above configuration will be described. In a state where there is a space between the upper mold 57 and the lower mold 51, a workpiece is set on the lower mold 51, and the upper die set plate 61 is moved downward by a drive unit (not shown). Let Then, by applying a strong force and heat to the workpiece with the upper mold 57 and the lower mold 51, the same shape as the mold is created on the workpiece, and the cone of the speaker is obtained.

  In this embodiment, a disc-shaped lower back reflector 71 is disposed between the lower heater plate 53 and the lower die set plate 55. The diameter of the lower back reflector 71 is set to be larger than the diameter of the cylindrical lower heater plate 53 and covers the lower surface of the lower heater plate 53 with a space in between.

  In addition, a disk-shaped upper back reflector 73 is disposed between the upper heater plate 59 and the upper die set plate 61. The diameter of the upper back reflector 73 is set to be larger than the diameter of the columnar upper heater plate 59, and covers the lower surface of the upper heater plate 59 through a space.

  Further, a cylindrical lower side reflector 75 is provided to cover the lower mold 51 and the side of the lower heater plate 53 via a space.

  In addition, a cylindrical upper side reflector 77 that covers the upper mold 57 and the side of the upper heater plate 59 via a space is provided.

  In the present embodiment, the lower back reflector 71, the upper back reflector 73, the lower side reflector 75, and the upper side reflector 77 are composed of a frame and an aluminum foil that is detachably attached to the frame. And composed.

  According to the above configuration, the following effects can be obtained.

 (1) The lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 are a lower back reflector 71, an upper back reflector 73, a lower side reflector 75, and an upper side. The reflector 77 is completely covered. Therefore, radiant heat transfer from the lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 is reflected by these reflecting plates, and the lower mold 51, the lower heater plate 53, and the upper mold are reflected. Since the mold 57 and the upper heater plate 59 are returned to, the heat loss from the lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 is reduced, and the power consumption is reduced.

 (2) The surface material of each reflector was aluminum. Aluminum reflects more than 85% in the infrared region, which is said to reflect radiant heat transfer. Therefore, heat loss from the lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 is reduced, and the power consumption is reduced.

 (3) The reflection of aluminum radiant heat transfer is due to the action of free electrons in the metal, and when these free electrons are repeated, the surface of the aluminum becomes dark.

  In this embodiment, each reflector is composed of a frame and an aluminum foil that is detachably attached to the frame, so that even if the aluminum foil is dark, it can be easily replaced.

  The present invention is not limited to the above embodiment. In the above embodiment, the lower mold 51 and the lower side are composed of four reflectors, that is, the lower back reflector 71, the upper back reflector 73, the lower side reflector 75, and the upper side reflector 77. Although the heater plate 53, the upper mold 57, and the upper heater plate 59 are completely covered, the lower back reflector 71, the upper back reflector 73, the lower side reflector 75, and the upper side reflector 77 With at least one of the reflectors, heat loss from the lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 is reduced, and the power consumption is reduced.

  Moreover, although aluminum was used as the material of the surface of the reflecting plate, gold, silver, or copper may be used.

  Further, in the above-described embodiment, the reflecting plate is composed of a frame and an aluminum foil that is detachably attached to the frame, but may be composed of an aluminum plate.

  Moreover, in the said embodiment, although this invention was applied to the hot press machine which shape | molds the cone of a speaker, it is applicable also to the hot press machine which forms the damper of a speaker.

  In the above embodiment, the present invention is applied to a hot press machine. However, the present invention is also applied to a film heating heater (heater block or infrared heater) used for vacuum forming or heating / cooling forming extension. it can.

  The inventor of the present application examined power consumption in the following cases in order to confirm the effect of the embodiment.

 (1) With the hot press shown in FIG. 6 having no reflector, continuous power measurement was performed for 8 hours to obtain integrated power. The result is shown in FIG.

  As shown in the figure, 5.4 kWh was consumed in 8 hours including 0.6 kWh at the time of temperature rise. There was a rapid power consumption about every 230 minutes.

(2) As shown in FIG. 1, the lower mold 51 and the lower heater plate 53 are composed of the lower back reflector 71, the upper back reflector 73, the lower side reflector 75, and the upper side reflector 77. Then, continuous power measurement was performed for 8 hours with a hot press machine that completely covered the upper mold 57 and the upper heater plate 59, and the integrated power was obtained. The result is shown in FIG.
4.1 kWh was consumed in 8 hours including 0.6 kWh at the time of temperature rise. There was no power consumption for about 10 minutes every 42 minutes.

 (3) In addition, the case where the lower back reflector 71 and the upper back reflector 73 are provided and the case where the lower back reflector 71, the upper back reflector 73 and the lower side reflector 75 are provided are also examined. It was.

  The result is shown in FIG. In the figure, a two-dot chain line represents (1), a solid line represents (2), and a broken line represents a case where a lower back reflector 71, an upper back reflector 73, and a lower side reflector 75 are provided, An alternate long and short dash line represents a case where the lower back reflector 71 and the upper back reflector 73 are provided.

  By providing the reflector, power consumption is reduced, and the lower mold 51, the lower heater plate 53, the upper mold 57, and the upper heater plate 59 are connected to the lower back reflector 71, the upper back reflector 73, and the lower side. It was confirmed that the power consumption was minimized when completely covered with the side reflector 75 and the upper side reflector 77.

51 Lower mold 53 Lower heater plate 57 Upper mold 59 Upper heater plate 71 Lower back reflector 73 Upper back reflector 75 Lower side reflector 77 Upper side reflector 77

Claims (5)

Mold,
A heater plate for heating the mold;
Said mold, said for the heater plates provided with the air, the mold, the reflecting plate covering the entire area of the outer surface of the heater plate,
A thermoforming machine for parts for electroacoustic transducers. The mold is composed of a lower mold and an upper mold disposed above the lower mold and facing the lower mold,
The heater plate is provided on the lower surface of the lower mold and heats the lower mold, and the upper heater plate is provided on the upper surface of the upper mold and heats the upper mold. And consist of
Furthermore,
A lower die set plate that is disposed below the lower heater plate via a space, and supports the lower mold, the heater plate,
An upper die set plate that is disposed above the upper heater plate via a space and supports the upper mold, the heater plate,
A guide provided on the lower die set plate for guiding the upper die set plate in a vertical direction;
A drive unit for driving the upper die set plate in the vertical direction;
Have
The said reflecting plate was provided through the space with respect to the whole outer surface of the said lower side metal mold | die, the said lower side heater plate, the said upper side metal mold | die, and the said upper side heater plate. Thermoforming machine for parts for electroacoustic transducers. The reflector is
A lower back reflector that is provided between the lower heater plate and the lower die set plate, and covers a lower surface of the lower heater plate through a space;
An upper back reflector provided between the upper heater plate and the upper die set plate and covering an upper surface of the upper heater plate with a space;
A lower mold, a cylindrical lower side reflector that covers the side of the lower heater plate via a space;
An upper mold, a cylindrical upper side reflector that covers the side of the upper heater plate via a space;
The thermoforming machine for parts for electroacoustic transducers according to claim 2, wherein:   The thermoforming machine for parts for electroacoustic transducers according to any one of claims 1 to 3, wherein the material of the surface of the reflector is any one of gold, silver, copper, and aluminum. The reflector is
Frame,
An aluminum foil detachably attached to the frame;
The thermoforming machine for parts for electroacoustic transducers according to any one of claims 1 to 4, characterized by comprising:

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