JP2006147153A - Heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a reflecting plate of a simple shape for a heating device with the excellent heating efficiency and excellent temperature uniformity of a molding mold. <P>SOLUTION: Infrared lamp heaters 1 irradiate infrared rays. Each fixing jig 2 holds the infrared lamp heater 1 individually. Gold plating 7 is applied to side faces of a transparent quartz tube 3 with its inside face in a smooth cylindrical shape, and the infrared rays irradiated from a plurality of the infrared lamp heaters 1 arranged inside the cylindrical shape are reflected toward the direction of a center axis of the cylindrical shape. The molding molds are arranged at positions on the center axis in the transparent quartz tube 3. The fixing jigs 2 of the same shape are overlapped on one another, so that the infrared lamp heaters are arranged at the same intervals in a direction parallel with the center axis in the quartz tube 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for heating a mold and a molding material when performing press molding, and more particularly to a technique for heating using an infrared lamp.

As an apparatus for heating a mold and a molding material when performing press molding, for example, Patent Document 1 discloses a heating apparatus for a glass molding machine. This apparatus is shown in FIG.
In FIG. 5, the upper and lower molds 102 and 103 for press-molding the molding material 101 are attached to the upper and lower shafts 104 and 105 via heat insulating cylinders 106 and 107, respectively.

  The upper and lower molds 102 and 103 are surrounded by a transparent quartz tube 108, and a molding chamber capable of adjusting the atmosphere is formed inside the transparent quartz tube 108. An infrared heating device 110 is provided outside the transparent quartz tube 108.

  The infrared heating device 110 is configured by stacking a plurality of combinations of ring-shaped infrared lamps 111 and reflection mirrors 112. The control device 120 controls the infrared lamps 111 so that the upper and lower molds 102 and 103 have a predetermined temperature.

  Each reflecting mirror 112 is disposed behind each infrared lamp 111 and reflects the light from the infrared lamp 111 toward the central axes of the upper and lower molds 102 and 103. A cross section of each reflecting mirror 112 cut along a plane including the central axis is configured by a parabolic curve, reflects light from each corresponding infrared lamp, and is perpendicular to the central axis in a cross section including the central axis. Change to parallel rays of direction. According to Patent Document 1, it is said that the reflection mirror 112 having such a shape improves the temperature uniformity of the mold and improves the energy efficiency.

For example, Patent Document 2 discloses a lamp heating device used in a glass lens molding machine or the like. This apparatus will be described with reference to FIG.
In this apparatus, a protrusion 222 protruding toward the infrared lamp 211 is formed at the center of the mirror 220, and portions extending from the tip of the protrusion 222 to both ends are formed on the reflection surface 221 including concave curved surface portions 223A and 223B, respectively. ing. The infrared ray 213 radiated from the infrared lamp 211 to the back side is configured to be guided to the heated member 214 placed on the front side of the infrared lamp 211 through the two focal points F on the side of the infrared lamp 211. According to Patent Document 2, it is said that by making the reflecting surface 221 of the mirror 220 into such a shape, infrared rays emitted from the infrared lamp can be used more effectively and the life of the infrared lamp can be extended. Yes.
JP 2004-137124 A JP 2002-359058 A

  The reflectors used in the heating device described above all have a complicated shape and also require high reflection efficiency. Therefore, the molding requires extremely high technology and results. As a result, the cost of the entire apparatus increases.

  The present invention has been made in view of the above-described problems, and the problem to be solved is to use a heating device having a good heating efficiency and a uniform temperature of a mold, and a simple-shaped reflector. Is to provide.

  A heating device that is one aspect of the present invention is a device that heats a mold and a molding material when performing press molding, and individually holds a plurality of infrared lamps that emit infrared rays and the infrared lamps one by one. And a reflecting cylinder that has a cylindrical shape with a smooth inner surface and reflects infrared rays emitted from a plurality of infrared lamps arranged inside the cylindrical shape in the direction of the central axis of the cylindrical shape. The mold is disposed at a position on the central axis inside the reflective cylinder, and the infrared lamp is disposed in a direction parallel to the central axis in the reflective cylinder by stacking the holding members. The above-described problems are solved by this feature.

At this time, it is desirable that the holding members have the same shape and the same size. In this case, the infrared lamps are arranged at equal intervals in a direction parallel to the central axis.
In the heating device according to the present invention described above, the holding member may hold the infrared lamp outside the reflecting tube.

At this time, a hole may be provided in the side surface of the reflecting tube, and the holding member may hold the end portion of the infrared lamp projected from the hole.
At this time, the holding member may hold a pair of end portions of the infrared lamp projected from each of the pair of holes provided to face the side surface of the reflecting tube.

  In the heating device according to the present invention described above, the infrared lamp has a ring shape, and the holding member is located at a position where the center of the ring shape of the infrared lamp coincides with the central axis of the cylindrical shape of the reflector. The infrared lamp may be held.

Moreover, in the heating apparatus according to the present invention described above, the reflecting tube may be a quartz tube having a metal film layer formed on the side surface.
Moreover, in the heating apparatus according to the present invention described above, a partition material that forms a molding chamber in which the molding die is disposed, and a sealing material that fills a gap between the end portions of the partition material and maintains an airtight state of the molding chamber. And a temperature control unit that suppresses a temperature rise of the sealing material due to the infrared rays.

At this time, the temperature control means may be a reflecting plate that reflects the infrared rays.
The temperature control means may be a cooling member through which a liquid flows.

  As described above, according to the present invention, it is possible to provide a heating device having good heating efficiency and uniform temperature uniformity of a mold using a simple-shaped reflector. Play.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an example will be described in which the present invention is implemented in a heating device used to heat a molding die and a molding material when molding an optical element such as a glass lens or a glass prism.

First, FIG. 1 will be described. This figure shows the configuration of a heating apparatus for carrying out the present invention.
In FIG. 1, the upper plate 10 and the lower plate 11 are provided with circular holes. One surface of the upper plate 10 is attached to the lower side of the cylindrical upper shaft 4, and one surface of the lower plate 11 is attached to the upper side of the cylindrical lower shaft 5. A cylindrical transparent quartz tube 6 is attached between the other surface of the upper plate 10 and the other surface of the lower plate 11. These members are all made up of the central axes of the cylindrical upper shaft 4, the lower shaft 5, and the transparent quartz tube 6, and the central axes of the circular holes respectively provided in the upper plate 10 and the lower plate 11. It is attached so that it may be located on the same straight line. In the following description, this straight line is referred to as “the central axis of the apparatus”.

  Further, a joint portion between the upper shaft 4 and the upper plate 10, a joint portion between the lower shaft 5 and the lower plate 11, a joint portion between the upper plate 10 and one end of the transparent quartz tube 6, and the lower plate 11 and the transparent portion. O-rings 9 serving as sealing materials are sandwiched between the joining portions of the quartz tube 6 and the other end. The O-ring 9 is for filling a gap between these joint portions and maintaining an airtight state of a molding chamber formed inside the transparent quartz tube 6.

  The transparent quartz tube 6 is a partition material that forms a molding chamber in which a molding die to be heated and a molding material are arranged. The object to be heated is disposed on the central axis of the apparatus inside the molding chamber.

A plurality of ring-shaped infrared lamp heaters 1 (five in FIG. 1) are arranged outside the transparent quartz tube 6 and are arranged at equal intervals in a direction parallel to the central axis of the apparatus.
FIG. 2 shows the structure of the infrared lamp heater 1 and shows the state of the infrared lamp heater 1 as viewed from above (in FIG. 1, a cross section of the infrared lamp heater 1 is shown). As can be seen from FIG. 2, the infrared lamp heater 1 has a ring-shaped (annular) glass tube at the center, and a heater wire is disposed inside the infrared lamp heater 1. Radiate. In addition, a glass tube extends outward from two opposing locations in the ring-shaped portion to form a pair of ends, and an electric wire 21 for supplying power to the heater wire passes through the inside of the ends. And led to the outside of the glass tube.

  In FIG. 1, the infrared lamp heaters 1 are individually held one by one by the fixing jig 2, and held at a position where the center of the ring shape of the infrared lamp heater 1 coincides with the center axis of the apparatus.

  The structure of the fixing jig 2 is shown in FIG. In FIG. 3, (a) shows the front, (b) shows the side, and (c) shows the back. By inserting the end of the infrared lamp heater 1 from the front to the back of the fixing jig 2 while passing the electric wire 21 extending from the infrared lamp heater 1 through the hole penetrating from the front to the back of the fixing jig 2, infrared rays are inserted. The lamp heater 1 is fixed to the fixing jig 2. The fixing jig 2 is formed of a heat resistant material such as alumina (aluminum oxide) or ceramics.

  In FIG. 1, five stages of fixing jigs 2 fixed to both ends of the pair of infrared lamp heaters 1 are stacked. Thus, by stacking the fixing jigs 2 having the same shape, the infrared lamp heaters 1 can be easily arranged at equal intervals in a direction parallel to the central axis of the apparatus, and are to be heated. This contributes to uniform heating. The stacked fixing jig 2 is fixed by being fitted into a hole of a jig mounting plate 12 fixed between the upper plate 10 and the lower plate 11 by the shaft 13.

  A transparent quartz tube 3 is disposed outside the ring-shaped portion of the infrared lamp heater 1 so as to surround the ring-shaped portion. The transparent quartz tube 3 is arranged so that the central axis of the cylindrical transparent quartz tube 3 also overlaps with the central axis of the apparatus, and a metal film layer is formed by applying gold plating 7 on the side surface thereof. The gold plating 7 reflects infrared rays radiated outward from the ring-shaped portion of the infrared lamp heater 1 in the direction of the central axis in the cylindrical shape of the transparent quartz tube 3, that is, in the direction of the central axis of the apparatus. Thereby, since the infrared rays radiated outward from the ring-shaped portion of the infrared lamp heater 1 also contribute to the heating of the object to be heated, the energy loss of the heating device is reduced and the heating efficiency is improved.

  The structure of the transparent quartz tube 3 to which the gold plating 7 is applied is shown in FIG. Since the inner side surface of the semicylindrical shape shown in the figure is a smooth surface without complicated irregularities, its formation is easy. Reference numeral 22 denotes a notch for installing an infrared lamp heater.

  The transparent quartz tube 3 is formed by joining the semi-cylindrical shape shown in FIG. 4 to a symmetrical shape. At this time, the notch 22 for installing the infrared lamp heater is transparent quartz. Five sets of ten holes, which face each other on the side of the tube 3, are formed. In FIG. 1, the transparent quartz tube 3 is disposed so that each pair of end portions of the infrared lamp heater 1 protrudes from the hole. That is, the fixing jig 2 is a pair of ends of the infrared lamp heater 1 that protrudes to the outside of the transparent quartz tube 3 from each of a pair of holes provided to face the side surface of the transparent quartz tube 3 that is a reflecting cylinder. The infrared lamp heater 1 is held by holding the part. By doing so, the influence of the fixing jig 2 on the heating of the object to be heated is reduced.

  By the way, a water cooling unit 8 is provided at a joint portion between the upper plate 10 and the lower plate 11 and the end of the transparent quartz tube 6. The water cooling section 8 is formed so that water flows through a groove formed in the ring-shaped member 8a surrounding the O-ring 9 and the outer peripheral surface of the cylindrical transparent quartz tube 6 as a cooling member. The O-ring 9 that functions and cools the O-ring 9 used to fill the gap at the end of the transparent quartz tube 6 by circulating water, suppresses the temperature rise of the O-ring 9 and heats the O-ring 9. It is provided as a first temperature control means for reducing the performance deterioration of the ring 9 and suppressing the deterioration of the airtightness of the molding chamber in the transparent quartz tube 6. The water supplied to the water cooling unit 8 is configured to be circulated by a pump provided in the water storage tank through a connection pipe (not shown) connected to the ring-shaped member 8a.

In the above configuration, oil may be used instead of water as the cooling liquid for cooling.
The water cooling unit 8 is further provided with a reflector 14. The reflection plate 14 is, for example, a metal plate that reflects infrared rays radiated from the infrared lamp heater 1, and is provided as a second cooling means for suppressing an increase in the temperature of the O-ring 9 due to the infrared rays. That is, similarly to the water cooling unit 8, the reflector 14 suppresses the temperature increase of the O-ring 9 to reduce the performance deterioration of the O-ring 9 due to heat, and suppresses the deterioration of the airtightness of the molding chamber in the transparent quartz tube 6. Is to do.

  By using the heating device configured as described above for heating the mold and the molding material when molding the optical element, energy loss is reduced and the temperature of the mold during heating is uniform. Therefore, the molded product can be manufactured with high dimensional accuracy.

  In addition, the present invention is not limited to the above-described embodiments, and various improvements and changes can be made without departing from the scope of the present invention.

It is a figure which shows the structure of the heating apparatus which implements this invention. It is a figure which shows the structure of an infrared lamp heater. It is a figure which shows the structure of a fixing jig. It is a figure which shows the structure of the transparent quartz tube in which gold plating is given. It is a figure which shows the example of the conventional heating apparatus for glass forming machines. It is a figure which shows the example of the conventional lamp | ramp heating apparatus used for a glass lens molding machine etc.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Infrared lamp heater 2 Fixing jig 3 Transparent quartz tube 4 Upper shaft 5 Lower shaft 6 Transparent quartz tube 7 Gold plating 8 Water-cooling part 8a Ring-shaped member 9 O-ring 10 Upper plate 11 Lower plate 12 Jig attachment plate 13 Shaft 14 Reflector DESCRIPTION OF SYMBOLS 21 Electric wire 22 Notch for infrared lamp heater installation 101 Molding material 102 Upper mold 103 Lower mold 104 Upper shaft 105 Lower shaft 106, 107 Thermal insulation tube 108 Transparent quartz tube 110 Infrared heating device 111, 211 Infrared lamp 112 Reflective mirror 120 Control device 213 Infrared ray 214 Heated member 220 Mirror 221 Reflecting surface 222 Protrusion 223A, 223B Concave surface

Claims (11)

A heating device for heating a mold and a molding material when performing press molding,
A plurality of infrared lamps emitting infrared rays;
A holding member for individually holding the infrared lamps;
A reflecting cylinder that reflects the infrared rays radiated from the plurality of infrared lamps arranged on the inner side of the cylindrical shape in the direction of the central axis of the cylindrical shape;
Have
The molding die is disposed at a position on the central axis inside the reflecting cylinder,
A heating apparatus, wherein the infrared lamps are arranged in a direction parallel to the central axis in the reflection tube by stacking the holding members.   The heating apparatus according to claim 1, wherein the holding member holds the infrared lamp outside the reflecting tube. A hole is provided in the side surface of the reflecting tube,
The holding member holds an end portion of the infrared lamp projected from the hole.
The heating apparatus according to claim 2.   4. The heating according to claim 3, wherein the holding member holds a pair of end portions of the infrared lamp projected from each of a pair of holes provided to face a side surface of the reflecting tube. apparatus. The infrared lamp has a ring shape,
The holding member holds the infrared lamp at a position where the center of the ring shape of the infrared lamp coincides with the central axis of the cylindrical shape of the reflector.
The heating apparatus according to claim 1.   The heating apparatus according to claim 1, wherein the reflecting cylinder is a quartz tube having a metal film layer formed on a side surface. A partition material forming a molding chamber in which the molding die is disposed;
A sealing material that fills a gap at an end of the partition material and maintains an airtight state of the molding chamber;
Temperature control means for suppressing temperature rise of the sealing material due to the infrared rays;
The heating device according to claim 1, further comprising:   The heating apparatus according to claim 7, wherein the temperature control means is a reflecting plate that reflects the infrared rays. A heating device for heating a mold and a molding material when performing press molding,
An infrared lamp for irradiating the mold with infrared rays;
A partition material forming a molding chamber in which the molding die is disposed;
A sealing material that fills a gap at an end of the partition material and maintains an airtight state of the molding chamber;
Temperature control means for suppressing temperature rise of the sealing material due to the infrared rays;
A heating device comprising:   The heating apparatus according to claim 9, wherein the temperature control means is a reflecting plate that reflects the infrared rays.   The heating device according to claim 9, wherein the temperature control means is a cooling member through which a fluid flows.

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