JP6415922B2 - Reflecting unit and heating device to which the reflecting unit is attached - Google Patents

Description

  According to the present invention, the reflection is attached to the body of the heating device arranged so as to surround the infrared heater that heats the object to be heated, facing the object to be heated on the opposite side of the object to be heated with the infrared heater interposed therebetween. The present invention relates to a unit and a heating device to which the reflection unit is attached.

  For example, Patent Document 1 discloses a light heating apparatus that reduces far-infrared rays applied to a heated object having light permeability and uniformly heats the heated object in the thickness direction. . The light heating device of Patent Document 1 includes a reflecting member that reflects light emitted from a heater lamp and irradiates an object to be heated, and a far-infrared absorbing member disposed on the front side of the heater lamp in the light irradiation direction. The cooling member is provided with cooling air circulation holes for circulating cooling air that cools the reflection member and the heater lamp when the heater lamp is turned on. In this light heating device, the object to be heated is irradiated with the radiated light emitted from the heater lamp or the reflected light from the reflecting member via the far-infrared absorbing member. At this time, in order to cool the reflecting member, the heater lamp, and the far-infrared absorbing member, cooling air is supplied to the cooling air circulation hole of the reflecting member and blown to the surface of the heater lamp or the far-infrared absorbing member. In that case, it can suppress that the reflective effect of the light by a reflective member falls as a result of suppressing a blackening of a reflective member due to the temperature rise of a reflective member by cooling air.

  Further, in Non-Patent Document 1, an infrared heater for heating an object to be heated is provided in the main body of the heating device, and a reflection unit for reflecting infrared rays emitted from the infrared heater toward the object to be heated is attached to the main body. In order to cool the reflection unit, a heating device for forcibly circulating cooling water along the outer surface of the reflection unit is disclosed. Also in this case, it can suppress that the said reflective effect falls by cooling water suppressing that a reflective unit blackens.

JP 2007-26698 A

Product Information / Heraeus Co., 2014, [Search July 30, 2014], <URL: http: //heraeus.co.jp/en/products/ip/heater_modules/water_cooling/watercooling.aspx>

  However, as in the light heating device described in Patent Document 1, in order to cool the reflecting member with cooling air, for example, the light heating device must be provided with a cooling fan that forcibly generates cooling air. Therefore, it is difficult to say that the structure for suppressing the reduction in the reflection effect of the reflecting member is simple. Further, as in the heating device described in Non-Patent Document 1, in order to cool the reflection unit using the cooling water, it is necessary to secure a space for forming the cooling water flow path in the reflection unit. Thus, there is a disadvantage that the reflection unit and the heating device to which the reflection unit is attached are increased in size.

  The present invention has been proposed in view of such a situation, and provides a reflection unit that has a simple structure that suppresses a reduction in reflection effect and that can be reduced in size, and a heating device to which the reflection unit is attached. For the purpose.

In order to achieve the above object, a reflection unit according to the invention of claim 1 is a heating unit disposed so as to surround an infrared heater that heats the object to be heated. A reflection unit having a metal reflection member that is attached to the opposite side of the object to be heated and reflects infrared rays emitted from the infrared heater toward the object to be heated. and the inert gas is formed by the heating device separately from and independently of the heating device comprises a glass tube which is sealed, characterized in Rukoto.
According to a second aspect of the present invention, in the configuration according to the first aspect, the main body is disposed so as to surround the plurality of infrared heaters arranged linearly, and the reflection unit includes the plurality of infrared heaters. A plurality of the glass tubes are linearly arranged in a range larger than the arrangement range of the plurality of infrared heaters in the same direction as the arrangement direction.
According to a third aspect of the present invention, in the configuration according to the first aspect, the main body is disposed so as to surround the plurality of infrared heaters arranged linearly, and the reflection unit includes the plurality of infrared heaters. A plurality of the glass tubes are arranged in a staggered manner in a direction intersecting the same direction in the same direction as the arrangement direction of the plurality of infrared heaters, and adjacent in the same direction. The glass tubes are brought close to each other.
According to a fourth aspect of the present invention, in the configuration according to the second or third aspect, the cross-sectional shape of each glass tube is an arrangement direction of the plurality of glass tubes arranged in the straight line or an arrangement of the plurality of infrared heaters. The reflecting member is formed in a long thin plate shape having an oval shape or an oval shape that is long in the same direction as the direction, and the short direction of the reflecting member is made to coincide with the arrangement direction of the plurality of glass tubes or the same direction. Then, the reflecting member is enclosed in the glass tube whose cross-sectional shape is the ellipse or the ellipse, and the dimension in the short direction is set in the arrangement direction of the plurality of glass tubes or in the same direction. The internal dimensions of the glass tube are substantially the same.
According to a fifth aspect of the present invention, there is provided a heating device in which a main body of the heating device is disposed so as to surround an infrared heater that heats an object to be heated, and an infrared ray emitted from the infrared heater is directed toward the object to be heated. The reflection unit having a metal reflection member to be reflected is a heating device attached to face the object to be heated with the infrared heater interposed therebetween, and the reflection unit is set to any one of claims 1 to 4. It is characterized by having set it as the reflection unit of description.

According to the reflection unit according to the first aspect of the invention and the heating device according to the fifth aspect of the invention, it is possible to suppress the reflection member from being oxidized in the glass tube by the inert gas. Therefore, as a result of maintaining the gloss of the reflecting member with a simple structure in which the reflecting member and the inert gas are simply enclosed in the glass tube, it is possible to suppress a reduction in the infrared reflection effect of the reflecting member.
Furthermore, the reflective effect is reduced by simply enclosing the reflective member and the inert gas in the glass tube without cooling with cooling air generated by a conventional cooling fan or cooling water flowing through the flow passage. Can be suppressed. As a result, there is no need to provide a cooling fan or a cooling water flow path for cooling the reflection unit. As a result, the reflection unit and the heating device to which the reflection unit is attached can be reduced in size.
According to invention of Claim 2 and 5, it makes it easy to reflect the infrared rays radiated | emitted from several infrared heaters toward a to-be-heated object by the reflective member arranged in the range larger than the arrangement range of several infrared heaters. be able to. Thereby, it can suppress more that the reflective effect of the infrared rays by a reflective member falls.
According to the third and fifth aspects of the present invention, in the same direction as the arrangement direction of the plurality of infrared heaters, the generation of a gap between adjacent glass tubes is suppressed in a range larger than the arrangement range of the plurality of infrared heaters. it can. As a result, it becomes difficult for infrared rays radiated from a plurality of infrared heaters to pass through between adjacent glass tubes, so that the infrared rays are reflected toward the object to be heated by the reflecting member sealed in the glass tubes. Can be made easier. In connection with this, it can suppress more that the reflective effect of the infrared rays by a reflective member falls.
According to invention of Claim 4 and 5, compared with the dimension of the transversal direction of the reflecting member enclosed in the inside of the glass tube which made the cross-sectional shape circular, the cross-sectional shape is oval or elliptical glass. The short dimension of the reflective member enclosed in the tube can be increased. Thereby, compared with the size of the reflecting surface of the reflecting member sealed inside the circular glass tube, the reflecting surface of the reflecting member sealed inside the oval or elliptical glass tube The size can be increased.

It is a general | schematic whole perspective view of the metal mold | die heating apparatus with which the reflection unit was attached in Embodiment 1 of this invention. It is a schematic sectional side view of the mold heating apparatus. It is a schematic longitudinal cross-sectional view of the same mold heating apparatus. It is a schematic perspective view which shows the state which mounted the die heating apparatus on the upper surface of the gravity casting metal mold | die. It is a schematic longitudinal cross-sectional view of the reflection unit of Embodiment 2 attached to a metal mold | die heating apparatus. It is a schematic plan view which shows the internal structure of the reflection unit of Embodiment 2. FIG. 6 is a schematic overall plan view of a quartz glass tube that is provided in the reflection unit of Embodiment 2 and in which a reflection member and an inert gas are enclosed. It is a schematic side view of the quartz glass tube. It is a schematic longitudinal cross-sectional view of the metal mold heating apparatus with which the reflection unit of Embodiment 2 was attached. It is a front view of the quartz glass tube with which the reflection unit of Embodiment 3 was equipped and the reflection member and the inert gas were enclosed. 5 is a schematic overall plan view of a quartz glass tube of Embodiment 3. FIG. It is a schematic sectional side view of the quartz glass tube of Embodiment 3.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. A mold heating apparatus 1 shown in FIGS. 1 to 3 includes a main body 2, an infrared heater 3, and a power cord 4. A reflection unit 5 is attached to the mold heating device 1. The main body 2 is made of stainless steel. The main body 2 is hollow and has a horizontally long box shape when viewed from the side. As an example, the main body 2 has a longitudinal dimension of about 630 mm, a lateral dimension of about 400 mm, and a height dimension of about 100 mm. The mold heating device 1 is an example of the heating device of the present invention.

  As shown in FIGS. 2 and 3, the main body 2 is provided with a through space 6 in a portion excluding the front end portion (left side in FIG. 2) and the rear end portion (right side in FIG. 2). The through space 6 opens to the upper surface of the main body 2 (upper side in FIG. 3) and the lower surface of the main body 2 (lower side in FIG. 3), and is formed to penetrate the main body 2. Further, as shown in FIG. 2, a front partition wall 9 that partitions the front end portion of the main body 2 and the through space 6 is formed in the main body 2 in the front-rear direction of the main body 2 (left-right direction in FIG. 2). The front partition wall 9 is provided with six through-holes 9A at equal intervals in the lateral direction of the main body 2 (frontward and rearward direction in FIG. 2). The through-hole 9A is used to connect the through space 6 and the front end portion in the main body 2 so that the front end side (left side in FIG. 2) of the infrared heater 3 described later enters the front end portion in the main body 2. .

  In addition, as shown in FIG. 2, a rear partition wall 10 that partitions the rear end portion of the main body 2 and the through space 6 in the front-rear direction of the main body 2 is formed in the main body 2. Similarly to the front partition wall 9, the rear partition wall 10 is also provided with six through holes 10 </ b> A that allow the through space 6 to communicate with the rear end portion in the main body 2. This through-hole 10A is used to allow the rear end side (right side in FIG. 2) of the infrared heater 3 to enter the rear end portion in the main body 2.

  As shown in FIG. 2, the infrared heater 3 has an elongated shape and is disposed so as to be surrounded by the main body 2. In the present embodiment, the infrared heater 3 is disposed in the through space 6 so as to face the opening 14 on the upper surface of the main body 2 and the opening 15 on the lower surface of the main body 2. Here, as shown in FIG. 3, an example in which six infrared heaters 3 are linearly arranged in the through space 6 in the short direction of the main body 2 is shown. Each infrared heater 3 is formed by enclosing a long thin plate-like carbonaceous heating element 26 in an elongated quartz glass tube 25 enclosing an inert gas (for example, argon gas). In the present embodiment, as shown in FIG. 3, the carbonaceous heating elements 26 are arranged in two rows in the lateral direction in the quartz glass tube 25. Each carbonaceous heating element 26 is accommodated in a quartz glass tube 25 and enclosed with an inert gas in a quartz glass tube 24 having a diameter smaller than that of the quartz glass tube 25. The front end face (left side in FIG. 2) of each quartz glass tube 25 is closed, and the opening of the rear end face of each quartz glass tube 25 is closed by a base 27. Two external connection terminals (not shown) are provided on the base 27 so as to protrude side by side in the lateral direction of the base 27. In FIG. 2, the carbonaceous heating element 26 is not shown.

  In the quartz glass tube 25, the two carbonaceous heating elements 26, 26 are connected in series by electrically connecting the front ends of the carbonaceous heating elements 26, 26 drawn from the respective quartz glass tubes 24 by electric wires. It is connected to the. On the other hand, the rear end side of each carbonaceous heating element 26 is drawn out from each quartz glass tube 24 and electrically connected to each external connection terminal described above by electric wires 28 (see FIG. 2).

  As shown in FIG. 2, in the main body 2, the front end side (left side in FIG. 2) of each quartz glass tube 25 enters the front end portion in the main body 2 through the through hole 9A of the front partition wall 9, and each through hole 9A. A heat insulating material (not shown) is sandwiched between the inner peripheral surface of the quartz glass tube 25 and the outer peripheral surface of the quartz glass tube 25. In addition, the rear end side (right side in FIG. 2) of each quartz glass tube 25 enters the rear end portion in the main body 2 through each through hole 10A, and the inner peripheral surface of each through hole 10A and the quartz glass tube 25. A heat insulating material (not shown) is sandwiched between the outer peripheral surfaces of the two. Thereby, the external connection terminal of each infrared heater 3 is prevented from being damaged by the influence of the radiant heat of the infrared heater 3.

  Further, as shown in FIGS. 1 and 4, the power cord 4 is drawn from the side surface of the main body 2. A terminal block (not shown) that is electrically connected to the external connection terminals of the respective infrared heaters 3 by lead wires (not shown) is disposed in the main body 2. The front end of the power cord 4 is electrically connected to this terminal block. As a result, the power cord 4 is electrically connected to the carbonaceous heating element 26 of each infrared heater 3 through the terminal block, the lead wire, and the external connection terminal. Further, as shown in FIG. 1, a handle portion 32 that opens in a semi-rectangular shape in a plan view of the main body 2 protrudes from the back surface 31 of the main body 2. In addition, a handle portion 32 is also projected from the front surface of the main body 2 (back side in the diagonally left direction in FIG. 1). In addition, illustration of the handle part 32 was abbreviate | omitted in FIG.

  As shown in FIGS. 2 and 3, the reflection unit 5 is made of stainless steel, and is formed by assembling a unit lower main body 5A and a unit upper main body 5B that can be divided into two vertically. This reflection unit 5 is also hollow and is formed in a horizontally long box shape in a side view. As an example, the reflective unit 5 has a longitudinal dimension of about 530 mm, a lateral dimension of about 310 mm, and a height dimension of about 32 mm.

  As shown in FIGS. 2 and 3, the reflection unit 5 is provided with a through space 36 in a portion excluding the front end (left side in FIG. 2) and the rear end (right side in FIG. 2) of the reflection unit 5. . The penetration space 36 is formed so as to open to the upper surface (upper side in FIG. 3) of the reflection unit 5 and the lower surface (lower side in FIG. 3) of the reflection unit 5 and penetrate the reflection unit 5. Further, as shown in FIG. 2, a front partition wall 37 that partitions the front end portion of the reflection unit 5 and the through space 36 is formed in the reflection unit 5 in the front-rear direction of the reflection unit 5 (left-right direction in FIG. 2). Has been. The front partition wall 37 is provided with nine through-holes 37A at equal intervals in the short side direction of the reflection unit 5 (front and back direction in FIG. 2). The through hole 37A allows the through space 36 and the front end portion in the reflection unit 5 to communicate with each other so that a front end side (left side in FIG. 2) of a quartz glass tube 40 described later enters the front end portion in the reflection unit 5. Used for.

  In addition, as shown in FIG. 2, a rear partition wall 38 that partitions the rear end portion of the reflection unit 5 and the through space 36 is formed in the reflection unit 5 in the front-rear direction of the reflection unit 5. Similarly to the front partition wall 37, the rear partition wall 38 is also provided with nine through holes 38A that allow the through space 36 and the rear end portion of the reflection unit 5 to communicate with each other. This through hole 38 </ b> A is used for allowing the rear end side (right side in FIG. 2) of the quartz glass tube 40 to enter the rear end portion in the reflection unit 5.

  As shown in FIGS. 2 and 3, the reflection unit 5 includes a quartz glass tube 40 having an elongated shape. In the present embodiment, the outer diameter of the quartz glass tube 40 is about 30 mm. The quartz glass tube 40 is disposed in the through space 36 so as to face the opening 42 (see FIG. 2) on the lower surface of the reflection unit 5. Here, an example is shown in which nine quartz glass tubes 40 are linearly arranged in the penetrating space 36 in the short direction of the reflection unit 5 and adjacent quartz glass tubes 40 are brought close to each other in the short direction. In each quartz glass tube 40, an inert gas (for example, argon gas) is sealed, and a reflecting member 45 is sealed. The reflecting member 45 is configured by vertically superimposing a long, front-reverse-type stainless steel plate 45A and a long, front-viewing-type stainless steel plate 45B and screwing them together. The reason why the reflecting member 45 is configured by superimposing both the stainless plates 45 </ b> A and 45 </ b> B is to suppress the warping of the reflecting member 45 due to the radiant heat of the infrared heater 3. As an example, the stainless steel plates 45A and 45B have a width dimension of 18 mm and a length dimension of 350 mm. As shown in FIG. 2, the front end (left side in FIG. 2) of the quartz glass tube 40 is closed, and a narrow tube portion 46 is formed at the rear end (right side in FIG. 2). The rear ends of both stainless plates 45A and 45B are sealed to the narrow tube portion 46.

  As shown in FIG. 2, in the reflection unit 5, the front end side of each quartz glass tube 40 enters the front end portion in the reflection unit 5 through each through hole 37 </ b> A, and the inner peripheral surface of each through hole 37 </ b> A and the quartz glass tube 40. A heat insulating material (not shown) is sandwiched between the outer peripheral surface. In addition, the rear end side of each quartz glass tube 40 enters the rear end portion of the reflection unit 5 through each through hole 38A, and between the inner peripheral surface of each through hole 38A and the outer peripheral surface of the quartz glass tube 40. A heat insulating material (not shown) is sandwiched between the two. As shown in FIGS. 1 to 3, a plate-like lid member 47 that closes the opening on the upper surface of the reflection unit 5 from above is screwed to the upper surface of the reflection unit 5. As shown in FIG. 3, the reflection unit 5 closes the opening 14 (see FIG. 3) on the upper surface of the main body 2 of the mold heating device 1, and makes the through spaces 6 and 36 coincide in the vertical direction. And placed on the upper surface of the main body 2. Thus, nine quartz glass tubes 40 are arranged facing the six infrared heaters 3 across the opening 14 on the upper surface of the main body 2 in the vertical direction. At this time, nine quartz glass tubes 40 are linearly arranged in a range larger than the arrangement range of the six infrared heaters 3 in the short direction of the main body 2. In addition, in this embodiment, as shown in FIG. 4, when the mold heating device 1 on which the reflection unit 5 is placed is arranged on the upper surface of the gravity casting mold 50, the reflection unit 5 shown in FIG. The respective infrared heaters 3 are disposed so as to face the gravity casting mold 50 on the side opposite to the gravity casting mold 50 (upper side in FIG. 3). The gravity casting mold 50 is an example of the object to be heated of the present invention, and the short direction of the main body 2 is an example of the same direction as the arrangement direction of the plurality of infrared heaters of the present invention.

  Next, a method for preheating the mold by the mold heating apparatus 1 on which the reflection unit 5 is placed will be described. FIG. 4 shows a metal gravity casting mold 50 in which, for example, an aluminum alloy is poured into the cavity 51 as a molten metal to obtain a predetermined molded product. In the gravity casting mold 50, the molten metal flows into the cavity 51 by gravity. Thereby, the molten metal is uniformly filled in the cavity 51. A predetermined molded product is obtained by casting to solidify the molten metal filled in the cavity 51. In the present embodiment, before filling the cavity 51 with the molten metal, the gravity casting mold 50 is preheated by the mold heating apparatus 1 on which the reflection unit 5 is placed as described below. . Thereby, the gravity casting mold 50 can be maintained at a high temperature, and the amount of hot water in the cavity 51 can be improved.

  An operator supports the mold heating device 1 on the upper surface of the gravity casting mold 50 while holding the handle portion 32 protruding from the back surface 31 and the front surface of the main body 2. Thereby, the upper side of the cavity 51 is closed by the mold heating device 1.

  Thereafter, when the power cord 4 (see FIG. 1) of the mold heating device 1 is connected to the power source, the carbonaceous heating element 26 of each infrared heater 3 electrically connected to the power cord 4 from the power cord 4. A current is supplied to (see FIG. 3). Then, each carbonaceous heating element 26 is red hot and generates infrared rays. This infrared ray is directly irradiated to the gravity casting mold 50 through the opening 15 (see FIG. 3) of the mold heating apparatus 1. As a result, the gravity casting mold 50 can be preheated by infrared radiant heat. In addition, the infrared rays are reflected by the reflecting member 45 enclosed in each quartz glass tube 40 and travel toward the gravity casting mold 50 through the opening 15 of the mold heating apparatus 1. Thereby, infrared rays are irradiated to the gravity casting mold 50. As a result, the gravity casting mold 50 can be preheated by infrared radiant heat.

  In particular, when the surface temperature of each carbonaceous heating element 26 can be increased from 1650 ° C. to 1800 ° C. as in the present embodiment, the wavelength range of infrared rays emitted from each carbonaceous heating element 26 ( 1 μm to 1.4 μm) is easily absorbed by the metal gravity casting mold 50. Thereby, it is possible to efficiently raise the temperature of the gravity casting mold 50 to a predetermined temperature in a short time. Furthermore, since the heat energy of the radiant heat of infrared rays is not taken away by the air, there is an advantage that the infrared rays can directly preheat the gravity casting mold 50.

  In addition to these, in the reflection unit 5, it is possible to suppress the reflection member 45 from being oxidized in each quartz glass tube 40 by the inert gas sealed in each quartz glass tube 40. Therefore, since the gloss of the reflecting member 45 can be maintained, it is possible to suppress a reduction in the infrared reflection effect of the reflecting member 45. In addition, as shown in FIG. 3, the infrared rays emitted from the six infrared heaters 3 are arranged in the short direction (left and right direction in FIG. 3) of the main body 2 of the mold heating device 1. The reflecting members 45 arranged in a range larger than the range can be easily reflected toward the gravity casting mold 50. Thereby, it can suppress more that the reflective effect of the infrared rays by the reflective member 45 falls. Furthermore, since the reflection effect of the infrared rays by the reflection member 45 can be suppressed by simply enclosing the reflection member 45 and the inert gas in each quartz glass tube 40, the decrease in the reflection effect is suppressed. In addition, unlike the conventional case, the reflection unit 5 does not need to be provided with a cooling fan or a cooling water flow passage. As a result, the reflection unit 5 can be downsized, and the mold heating device 1 on which the reflection unit 5 is placed can be downsized.

  When the temperature of the gravity casting mold 50 is raised to a predetermined temperature by the preheating described above, the handle 32 that the operator protrudes from the back surface 31 and the front surface of the main body 2 of the mold heating device 1 respectively. The mold heating device 1 is taken out from the upper surface of the gravity casting mold 50 while holding.

<Effect of Embodiment 1>
In the reflection unit 5 of this embodiment and the mold heating device 1 on which the reflection unit 5 is placed, it is possible to suppress the reflection member 45 from being oxidized in each quartz glass tube 40 by an inert gas. Therefore, the gloss of the reflecting member 45 can be maintained with a simple structure in which the reflecting member 45 and the inert gas are simply enclosed in each quartz glass tube 40. As a result, the infrared reflecting effect of the reflecting member 45 is reduced. Can be suppressed.
Furthermore, without performing cooling with cooling air generated by a conventional cooling fan or cooling water flowing through the flow path, it is only necessary to enclose the reflective member 45 and inert gas in each quartz glass tube 40, It can suppress that the reflection effect falls. As a result, there is no need to provide a cooling fan or a cooling water flow path for cooling the reflection unit 5, and as a result, the reflection unit 5 and the mold heating device 1 on which the reflection unit 5 is placed can be reduced in size. Is possible.

  Further, gravity casting is performed by the reflecting member 45 in which the infrared rays emitted from the six infrared heaters 3 are arranged in a range larger than the arrangement range of the infrared heaters 3 in the short direction of the main body 2 of the mold heating device 1. It can be easily reflected toward the mold 50. Thereby, it can suppress more that the reflective effect of the infrared rays by the reflective member 45 falls.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. Here, the same configurations as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The reflection unit 60 shown in FIGS. 5 and 6 is made of stainless steel, and is formed by assembling a unit lower body 60A and a unit upper body 60B that can be divided into two parts in the vertical direction. This reflection unit 60 is also formed in the same dimension as the dimension of the reflection unit 5 of the first embodiment.

  As shown in FIG. 6, a front partition wall 61 that partitions the front end of the reflection unit 60 and the through space 36 is formed in the reflection unit 60 in the front-rear direction of the reflection unit 60 (left-right direction in FIG. 6). Yes. The front partition wall 61 is provided with 21 through-holes 61A in two steps in the vertical direction (front and rear direction in FIG. 6) of the reflection unit 60 in the short direction of the reflection unit 60 (vertical direction in FIG. 6). Yes. Here, eleven through holes 61A are provided in the upper stage, and ten through holes 61A are provided in the lower stage. The through hole 61A communicates the through space 36 with the front end portion in the reflection unit 60 so that a front end portion (left side in FIG. 6) of a quartz glass tube 40A described later enters the front end portion in the reflection unit 60. Used for.

  In addition, as shown in FIG. 6, a rear partition wall 62 that partitions the rear end portion of the reflection unit 60 and the through space 36 is formed in the reflection unit 60 in the front-rear direction of the reflection unit 60. Similarly to the front partition wall 61, the rear partition wall 62 is provided with 21 through holes 62 </ b> A that allow the through space 36 and the rear end portion in the reflection unit 60 to communicate with each other. Each through-hole 62A and each said through-hole 61A are arrange | positioned so that the reflection unit 60 may oppose in the front-back direction. Each through hole 62 </ b> A is used to allow the rear end portion (right side in FIG. 6) of the quartz glass tube 40 </ b> A to enter the rear end portion in the reflection unit 60.

  Further, as shown in FIG. 6, a partition surface 64 that partitions the front end of the unit upper body 60B and the front end of the unit lower body 60A in the vertical direction of the reflection unit 60 is formed at the front end of the unit upper body 60B. Has been. A gate-shaped glass tube fixing member 65 is erected on the upper surface of the partition surface 64 so as to be long in the short direction of the reflection unit 60 (vertical direction in FIG. 6) when viewed from the front in the short direction. On the upper surface of the glass tube fixing member 65, a notch (not shown) into which the front end portion of the quartz glass tube 40A that has entered the front end portion in the reflection unit 60 through each upper through hole 61A is fitted. A plurality (here, 11) are provided. In addition, a partition surface 67 that partitions the rear end portion of the unit upper body 60B and the rear end portion of the unit lower body 60A in the vertical direction of the reflection unit 60 is formed at the rear end portion of the unit upper body 60B. . A glass tube fixing member 68 is erected on the upper surface of the partition surface 67 in the same manner as in the case of being provided on the upper surface of the partition surface 64. Notch portions (not shown) into which the rear end portions of the quartz glass tubes 40A that have entered the rear end portions of the reflection unit 60 through the upper through-holes 62A are also fitted, respectively, on the upper surface of the glass tube fixing member 68. Are provided (in this case, 11).

  As shown in FIG. 5, a holding frame body 70 of the quartz glass tube 40 </ b> A is disposed in the through space 36. In the present embodiment, the holding frame bodies 70 are arranged in the front end side (left side in FIG. 6) and the rear end side (right side in FIG. 6) of the reflection unit 60 in the through space 36. It was fixed to the side wall of the through space 36. The holding frame body 70 includes holding spaces 71 for the quartz glass tubes 40A that are alternately formed in a staggered manner in two stages in the vertical direction of the reflecting unit 60 (through space 36) when the reflecting unit 60 is viewed from the front in the short direction. 21 are provided. The holding frame body 70 has a predetermined length in the longitudinal direction of the reflection unit 60, and the cross-sectional shape of each holding space 71 is a circular shape that matches the shape of the surface of the quartz glass tube 40A. As shown in FIG. 5, adjacent holding spaces 71 are arranged without gaps in the short direction, and adjacent holding spaces 71 are connected by a connecting portion 72 in the vertical direction.

  Furthermore, as shown in FIG. 6, a plate-like front lid member 73 that closes the front end portion of the unit upper body 60B from above is fixed to the upper surface of the unit upper body 60B with screws. In addition, a plate-like rear lid member 74 that closes the rear end portion of the unit upper body 60B from above is screwed to the upper surface of the unit upper body 60B. A plate-shaped central lid member 78 (see FIG. 9) that closes the opening 76 (see FIG. 5) on the upper surface of the reflection unit 60 from above is screwed to the upper surface of the unit upper body 60B.

  As shown in FIGS. 5 and 6, the reflection unit 60 includes an elongated quartz glass tube 40A (see FIGS. 7 and 8). The outer diameter of the quartz glass tube 40A was about 30 mm. As shown in FIG. 5, the quartz glass tube 40 </ b> A is disposed in the through space 36 so as to face the opening 77 on the lower surface of the reflection unit 60. Here, an example is shown in which 21 quartz glass tubes 40A are arranged in the penetrating space 36 in a staggered manner in two stages in the direction intersecting the short direction of the reflection unit 60 (the vertical direction of the reflection unit 60). As shown in FIGS. 7 and 8, an inert gas (for example, argon gas) is sealed in each quartz glass tube 40A, and a reflecting member 80 is sealed. The reflecting member 80 is made of a long thin plate-like stainless steel plate, and has a width dimension of 7.6 mm and a length dimension of 350 mm. As shown in FIG. 8, a thin tube portion 81 is formed at the front end and the rear end of the quartz glass tube 40A. Further, one end of a leaf spring 83 that is bent in the front-rear direction of the reflecting member 80 and is extensible is welded to both ends of the reflecting member 80. The leaf spring 83 was made of molybdenum. The other end of each leaf spring 83 is welded to a metal foil (morib foil) 84, and each metal foil 84 is sealed to the thin tube portion 81. Thereby, in the quartz glass tube 40, the reflecting member 80 is enclosed by the leaf spring 83 so as to be movable in the front-rear direction. Therefore, for example, the impact received by the reflection unit 60 is absorbed by the leaf spring 83, and it is possible to prevent the reflection member 80 from being damaged, or the reflection member 80 from colliding with the quartz glass tube 40A and damaging the quartz glass tube 40A. . The reason why the leaf spring 83 and the metal foil 84 are made of molybdenum is that the heat-resistant temperature of molybdenum is high. As an example, the thickness dimension of the leaf spring 83 is 0.1 mm, and the thickness dimension of the metal foil 84 is 28 μm.

  As shown in FIGS. 5 and 6, in the reflection unit 60, the front end side of the 11 quartz glass tubes 40 </ b> A is inserted into the upper holding space 71 in the holding frame body 70 on the front end side of the reflection unit 60 and penetrates the upper stage. It enters the front end portion in the reflection unit 60 through the hole 61 </ b> A and is fitted into the notch portion of the glass tube fixing member 65. A heat insulating material (not shown) is sandwiched between the inner peripheral surface of the upper through hole 61A and the outer peripheral surface of the quartz glass tube 40A. In addition, the rear end side of the eleven quartz glass tubes 40A is inserted into the upper holding space 71 in the holding frame 70 on the rear end side of the reflecting unit 60, and the inside of the reflecting unit 60A is passed through the upper through hole 62A. It enters the rear end portion and is fitted into the notch portion of the glass tube fixing member 68. A heat insulating material (not shown) is sandwiched between the inner peripheral surface of the upper through hole 62A and the outer peripheral surface of the quartz glass tube 40A.

  On the other hand, in the reflection unit 60, the front end side of the ten quartz glass tubes 40A is inserted into the lower holding space 71 in the holding frame body 70 on the front end side of the reflection unit 60, and the reflection unit 60 passes through the lower through hole 61A. It enters the front end portion and is disposed on the partition surface 64 inside the portal glass tube fixing member 65. A heat insulating material (not shown) is sandwiched between the inner peripheral surface of the lower through hole 61A and the outer peripheral surface of the quartz glass tube 40A. In addition, the rear end side of the ten quartz glass tubes 40A is inserted into the lower holding space 71 in the holding frame 70 on the rear end side of the reflecting unit 60, and the rear of the reflecting unit 60 is passed through the lower through hole 62A. It enters the end portion and is arranged on the partition surface 67 inside the gate-shaped glass tube fixing member 68. A heat insulating material (not shown) is sandwiched between the inner peripheral surface of the lower through-hole 62A and the outer peripheral surface of the quartz glass tube 40A.

  As shown in FIG. 9, the reflection unit 60 is placed on the upper surface of the main body 2 so as to block the opening 14 on the upper surface of the main body 2 of the mold heating device 1 and so that the through spaces 6 and 36 coincide in the vertical direction. Has been. Thus, the 21 quartz glass tubes 40A arranged in a staggered manner in two stages in the vertical direction of the main body 2 are arranged to face the six infrared heaters 3 in the vertical direction across the opening 14. At this time, 21 quartz glass tubes 40A are arranged in two stages in the vertical direction of the main body 2 in a range larger than the arrangement range of the six infrared heaters 3 in the short direction of the main body 2 (left and right direction in FIG. 9). It will be arranged in a staggered pattern. In addition, as shown in FIG. 9, since the holding spaces 71 are arranged without gaps in the short direction of the main body 2, adjacent quartz glasses inserted and held in each holding space 71 in the short direction. The tubes 40A are close to each other. In addition, the up-down direction of the main body 2 is an example of a direction intersecting with the arrangement direction of the plurality of infrared heaters of the present invention.

  Next, a method for preheating the mold in the second embodiment will be described. As in the first embodiment, the operator closes the upper portion of the cavity 51 (see FIG. 4) with the mold heating device 1 on which the reflection unit 60 is placed. Also in the second embodiment, the infrared rays generated by the carbonaceous heating element 26 (see FIG. 9) of each infrared heater 3 are passed through the opening 15 of the die heating device 1 to the gravity casting mold 50 (see FIG. 4). Directly irradiated. In addition, infrared rays are reflected by the reflecting member 80 enclosed in each quartz glass tube 40 </ b> A and travel toward the gravity casting mold 50 through the opening 15 of the mold heating apparatus 1. Thereby, infrared rays are irradiated to the gravity casting mold 50. As a result, the gravity casting mold 50 can be preheated by infrared radiant heat.

  Furthermore, as shown in FIG. 9, adjacent quartz glass tubes 40 </ b> A are close to each other in the shorter direction of the main body 2 in a range larger than the arrangement range of the six infrared heaters 3. For this reason, in this large range, it can suppress that a clearance gap produces between adjacent quartz glass tubes 40A. As a result, the infrared rays radiated from the six infrared heaters 3 are less likely to pass between the adjacent quartz glass tubes 40A. As a result, the infrared rays are reflected by the reflecting member 80 enclosed in each quartz glass tube 40A. It can be easily reflected toward the gravity casting mold 50. In connection with this, it can suppress more that the reflective effect of the infrared rays by the reflective member 80 falls.

  Further, as shown in FIGS. 5 and 9, when the quartz glass tube 40 </ b> A is inserted and held in each holding space 71, the connecting unit 72 lies between the holding spaces 71 adjacent to each other in the vertical direction of the reflection unit 60. A gap is provided in Since air circulates through the air flowing through the gap, it is possible to suppress air heated by infrared rays from staying in the reflection unit 60. Thereby, the temperature rise above the reflection unit 60 can be suppressed.

<Effect of Embodiment 2>
In the reflection unit 60 of this embodiment and the mold heating device 1 on which the reflection unit 60 is placed, the arrangement range of the six infrared heaters 6 is larger in the short direction of the main body 2 of the mold heating device 1. In a range, it can suppress that a clearance gap produces between adjacent quartz glass tubes 40A. As a result, the infrared rays radiated from the six infrared heaters 3 are less likely to pass between the adjacent quartz glass tubes 40A. As a result, the infrared rays are reflected by the reflecting member 80 enclosed in each quartz glass tube 40A. It can be easily reflected toward the gravity casting mold 50. In connection with this, it can suppress more that the reflective effect of the infrared rays by the reflective member 80 falls.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. Here, the same configurations as those of the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. 10 to 12 show the quartz glass tube 40B arranged in the reflection unit 5 of the first embodiment and the reflection unit 60 of the second embodiment. This quartz glass tube 40B has two quartz plate glasses stacked one above the other, and the peripheral portions of both quartz plate glasses are joined together by welding, so that it is long in the front-rear direction (the left-right direction in FIGS. 11 and 12) and laterally viewed from the front. It is formed to have an oval cross section that is long in the direction. As shown in FIGS. 11 and 12, the quartz glass tube 40B contains a reflective member 91 and an inert gas (eg, argon gas). The reflecting member 91 is formed of a long thin plate-like stainless steel plate. In the quartz glass tube 40B, the short side direction (vertical direction in FIG. 11) of the reflecting member 91 coincides with the lateral direction in the front view of the quartz glass tube 40B, and the width dimension of the reflecting member 91 is The internal dimensions of the quartz glass tube 40B in the lateral direction were substantially the same. As an example, the reflective member 91 has a width of 50 mm and a length of 350 mm. Thereby, the width dimension of the reflecting member 91 was made larger than the width dimension (18 mm) of the reflecting member 45 (45A, 45B) of the first embodiment and the width dimension (7.6 mm) of the reflecting member 80 of the second embodiment.

  When the quartz glass tube 40B of this embodiment is arranged in the reflection unit 5 instead of the quartz glass tube 40 of the first embodiment, the cross-sectional shape of the quartz glass tube 40B is the short direction of the main body 2 of the mold heating device 1 ( The shape is an ellipse that is long in the left-right direction in FIG. Then, the reflecting member 91 is enclosed in the quartz glass tube 40B so that the width direction of the reflecting member 91 coincides with the short direction. In addition, the width dimension of the reflecting member 91 is substantially the same as the internal dimension of the quartz glass tube 40B in the short direction. When the gravity casting mold 50 is preheated by the mold heating device on which the reflection unit including the quartz glass tube 40B is placed, the quartz glass tube 40 having a circular cross-sectional shape as in the first embodiment is used. The width dimension of the reflecting member 91 enclosed in the quartz glass tube 40B is larger than the width dimension of the reflecting member 45 (45A, 45B) enclosed therein. Thereby, compared with the size of the reflecting surface of the reflecting member 45 enclosed in the quartz glass tube 40, the size of the reflecting surface of the reflecting member 91 enclosed in the quartz glass tube 40B can be increased. it can. Therefore, as compared with the reflecting member 45 sealed in the quartz glass tube 40, the reflecting member 91 sealed in the quartz glass tube 40B uses the infrared radiation emitted from the six infrared heaters 3 by gravity casting. It can be easily reflected toward the mold 50. In addition, the width dimension of the reflection member 91 is an example of the dimension of the transversal direction of the reflection member of this invention.

  On the other hand, instead of the quartz glass tube 40A of the second embodiment, the quartz glass tube 40B of the present embodiment is arranged in the reflection unit 60, and a mold heating device on which the reflection unit including the quartz glass tube 40B is placed, Even when the gravity casting mold 50 is preheated, the quartz glass tube is compared with the width dimension of the reflecting member 80 enclosed in the quartz glass tube 40A having a circular cross section as in the second embodiment. The width dimension of the reflection member 91 enclosed in 40B becomes large. Thereby, compared with the size of the reflecting surface of the reflecting member 80 enclosed in the quartz glass tube 40A, the size of the reflecting surface of the reflecting member 91 enclosed in the quartz glass tube 40B can be increased. it can. Therefore, as compared with the reflecting member 80 enclosed in the quartz glass tube 40A, the reflecting member 91 enclosed in the quartz glass tube 40B uses the infrared radiation emitted from the six infrared heaters 3 by gravity casting. It can be easily reflected toward the mold 50.

<Effect of Embodiment 3>
In the reflection unit of the present embodiment and the mold heating device on which the reflection unit is placed, the width is compared with the width of the reflection members 45 and 80 enclosed in the quartz glass tubes 40 and 40A having a circular cross-sectional shape. And the dimension of the width direction of the reflective member 91 enclosed in the quartz glass tube 40B whose cross-sectional shape is an ellipse shape can be enlarged. Thereby, the reflection enclosed in the oval quartz glass tube 40B is compared with the size of the reflection surface of the reflecting member 45, 80 enclosed in the circular quartz glass tube 40, 40A. The size of the reflecting surface of the member 91 can be increased.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In embodiment mentioned above, although the example which applies this invention to the metal mold | die heating apparatus 1 in which each reflection unit 5 and 60 was mounted was shown, it is not restricted to this. For example, each of the reflection units 5 and 60 is placed on a heating device having the same shape as the mold heating device 1, and the heating device is heated for heat treatment of metal, resin, ceramics, etc., or for drying coating. It may be used for processing. In addition, unlike the above-described embodiment, the quartz tube glass 40, 40A provided in the reflection units 5, 60 includes an inert gas and a long reflection member having an annular cross-section and the infrared heater 3 side. You may enclose the long reflective member formed by bending so that it might open.

  Further, in the above-described embodiment, the example in which each of the reflection units 5 and 60 is placed on the mold heating device 1 is shown. However, the present invention is not limited to this, and each of the reflection units 5 and 60 is heated by a die or the like. It may be fixed to the device 1. In addition, in Embodiment 1 described above, an example in which nine quartz glass tubes 40 are linearly arranged in the transverse direction of the reflection unit 5 in the through space 36 of the reflection unit 5 has been shown. Depending on the size of the reflection unit 5, the quartz glass tubes 40 may be linearly arranged in the through space 36 in the short-side direction with 8 or less, or 10 or more. In addition, in Embodiment 2 described above, an example in which 21 quartz glass tubes 40A are arranged in a staggered manner in two stages in the vertical direction of the reflection unit 60 in the through space 36 of the reflection unit 60 has been described. Not limited to this, in accordance with the size of the reflection unit 60, 19 or less or 23 or more quartz glass tubes 40 </ b> A may be arranged in the through space 36 in a staggered manner in two steps in the vertical direction. In the third embodiment, the quartz glass tube 40B has an oval cross section. However, the present invention is not limited thereto, and the cross section may be elliptical. Also in this case, as in the case of the third embodiment, the ellipse is compared with the size of the reflecting surface of the reflecting members 45 and 80 enclosed in the quartz glass tubes 40 and 40A having a circular cross-sectional shape. It is possible to increase the size of the reflecting surface of the reflecting member enclosed in the shaped quartz glass tube. Furthermore, in Embodiment 1 described above, an example in which nine quartz glass tubes 40 are linearly arranged in the short direction of the reflection unit 5 and adjacent quartz glass tubes 40 are close to each other in the short direction. Although shown, it is not limited to this. For example, the nine quartz glass tubes 40 may be arranged linearly in a state where an appropriate gap is provided between the adjacent quartz glass tubes 40. In such a case, if the size of the gap is appropriately changed, the degree to which the infrared rays emitted from the six infrared heaters 3 are transmitted through the gap can be changed. As a result, the degree to which infrared rays are reflected toward the gravity casting mold 50 by the reflecting member 45 enclosed in the quartz glass tube 40 can be adjusted. As a result, the degree of preheating of the gravity casting mold 50 can be adjusted. It becomes possible.

  Moreover, although the infrared heater 3 has shown the example which has arrange | positioned the carbonaceous heating element 26 in 2 rows in the quartz glass tube 25 in the horizontal direction in embodiment mentioned above, it is not restricted to this. For example, the infrared heater 3 may be configured by disposing one carbonaceous heating element 26 enclosed in one quartz glass tube 24 in the quartz glass tube 25. In addition to this, the carbonaceous heating elements 26 may be arranged in two rows or one in the quartz glass tube 25 without being enclosed in the quartz glass tube 24. In addition, the heating apparatus represented by the mold heating apparatus 1 of the above-described embodiment incorporates an infrared heater in which a tungsten filament as a heating element is arranged in a quartz glass tube 25 in place of the carbonaceous heating element 26. May be. In addition to this, the heating device may include an infrared heater in which a nichrome wire or an iron chrome wire, which is a heating element, is arranged in a glass tube that does not enclose an inert gas.

  In addition, in the above-described embodiment, an example in which six infrared heaters 3 are linearly arranged in the short direction of the main body 2 in the through space 6 of the mold heating device 1 is shown. In accordance with the size of the main body 2 corresponding to the size of the mold to be preheated, the infrared heaters 3 may be linearly arranged in the through space 6 in the short direction with 5 or less or 7 or more. .

  1 .. Mold heating device, 2 .... Main body of mold heating device, 3 .... Infrared heater, 5, 60 ... Reflection unit, 40, 40A, 40B ... Silica glass tube, 45, 80, 91 ... Reflective member, 50 ·· Gravity casting mold.

Claims (5)

The infrared heater is attached to a main body of a heating device disposed so as to surround an infrared heater that heats the object to be heated, facing the object to be heated on the opposite side of the object to be heated with the infrared heater interposed therebetween. A reflection unit having a metal reflection member that reflects infrared rays emitted from the object to be heated,
Reflecting unit, wherein Rukoto said the reflecting member and the inert gas is formed by the heating device separately from and independently of the heating device comprises a glass tube that is sealed inside. The main body is arranged so as to surround the plurality of infrared heaters arranged in a straight line,
In the reflection unit, a plurality of the glass tubes are linearly arranged in a range larger than the arrangement range of the plurality of infrared heaters in the same direction as the arrangement direction of the plurality of infrared heaters. The reflection unit according to claim 1. The main body is arranged so as to surround the plurality of infrared heaters arranged in a straight line,
In the reflection unit, a plurality of the glass tubes are staggered in a direction intersecting the same direction in a range larger than the arrangement range of the plurality of infrared heaters in the same direction as the arrangement direction of the plurality of infrared heaters. The reflection unit according to claim 1, wherein the glass tubes that are arranged and are adjacent to each other in the same direction are brought close to each other. The cross-sectional shape of each glass tube is an oval or elliptical shape that is long in the same direction as the arrangement direction of the plurality of glass tubes arranged in the straight line or the arrangement direction of the plurality of infrared heaters,
The reflecting member is formed in a long thin plate shape, and the short-side direction of the reflecting member is made to coincide with the arrangement direction of the plurality of glass tubes or the same direction. The reflective member is enclosed inside the glass tube, and the dimension in the short-side direction is substantially the same as the inner dimension of the glass tube in the arrangement direction of the plurality of glass tubes or in the same direction. The reflection unit according to claim 2 or 3. A reflection unit having a metal reflection member that is arranged so that a main body of a heating device surrounds an infrared heater that heats an object to be heated, and that reflects infrared rays emitted from the infrared heater toward the object to be heated. Is a heating device attached facing the object to be heated across the infrared heater,
A heating apparatus, wherein the reflection unit is the reflection unit according to claim 1.

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