JP2015150790A - Mold heating device and method of heating mold preliminarily by mold heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding heating device which improves safety and can efficiently heat a fixed mold and a movable mold preliminarily and a method of heating a mold preliminarily by a mold heating device.SOLUTION: A mold heating device 1 is held by and arranged between a fixed mold and a movable mold before a molten material is injected into a cavity formed by clamping the fixed mold 40 and the movable mold 41 capable of approaching and separating from the fixed mold in such a way as to oppose the fixed mold and heats the fixed mold and the movable mold preliminarily. The mold heating device has a built-in IR heater 3 comprising a carbonaceous heat generator sealed in a glass tube, and the fixed mold and the movable mold are heated through irradiation with IR rays generated by electrifying the carbonaceous heat generator.

Description

  The present invention is disposed between the fixed mold and the movable mold by being sandwiched between the fixed mold and a movable mold that is opposed to and can be separated from the fixed mold. The present invention relates to a mold heating apparatus that preheats the fixed mold and the movable mold, and a mold preheating method in which the fixed mold and the movable mold are preheated by the mold heating apparatus.

  For example, Patent Document 1 discloses a die heating burner device that is arranged between an upper die and a lower die for forging and preheats the upper die and the lower die in a preparation stage before production. . This mold heating burner device is made of a ceramic-made rectangular burner body having a space formed therein, a metal fiber mat attached to the upper and lower surfaces of the burner body, and gas in the space in the burner body. And a gas supply pipe for supplying the gas. In a preparatory stage before production, the burner device for heating a mold of Patent Document 1 is sandwiched between an upper mold and a lower mold and disposed between the upper mold and the lower mold, and then the burner main body through a gas supply pipe When gas is supplied to the inner space, the gas passes through the metal fiber mat and flows out of the surface of the metal fiber mat. When this gas is ignited, a thin-film flame is formed on the surface of the metal fiber mat, and the upper mold and the lower mold are preheated by radiant heat generated by the flame.

JP-A-8-117912

  However, in the above-described mold heating burner device, for example, a fixed mold such as a lower mold or a movable mold such as an upper mold that can be brought into contact with and separated from the fixed mold is heated. Since it is necessary to use gas as a source, it is conceivable that a fire may occur due to gas leaked from the die heating burner device. For this reason, in the metal mold heating apparatus using gas as a heat source, there is a concern that safety is inferior in terms of preventing the occurrence of fire.

  Furthermore, since the heat energy of the radiant heat due to the flame as described above may be taken away by air, if the heat energy is taken away during the preliminary heating of the fixed mold and the movable mold, the fixed mold and the movable mold There was also a concern that it could not be preheated efficiently.

  The present invention has been proposed in view of such circumstances, and is a mold heating device capable of improving safety and efficiently preheating a fixed mold and a movable mold, and a mold using the mold heating apparatus. An object is to provide a method for preheating a mold.

In order to achieve the above object, a mold heating apparatus according to the invention of claim 1 is configured to clamp a fixed mold and a movable mold that faces the fixed mold and can be contacted and separated from the fixed mold. Before injecting the molten material into the cavity formed, the fixed mold and the movable mold are sandwiched between the fixed mold and the movable mold, and the fixed A mold heating device for preheating a mold and the movable mold, wherein a carbonaceous heating element is enclosed in a glass tube, and an infrared ray is applied to the stationary mold and the movable mold by energizing the carbonaceous heating element. An infrared heater that heats the fixed mold and the movable mold by irradiating the fixed mold and the movable mold is built in. The invention according to claim 2, in the structure according to claim 1, A first facing surface facing the fixed mold and a first facing surface facing the movable mold. A through space is provided in each of the two opposing surfaces and penetrates the main body, and the infrared heater is disposed in the through space so as to face the opening of the first opposing surface and the opening of the second opposing surface. It is characterized by that.
According to a third aspect of the present invention, in the configuration according to the first or second aspect, the carbonaceous heating element is formed in a long thin plate shape, and the carbonaceous heating element is arranged in the longitudinal direction of the carbonaceous heating element. The slits that are cut from one side edge along the front side to the front side of the other side edge to adjust the electric resistance value of the carbonaceous heating element are alternately formed opposite to each other.
According to a fourth aspect of the present invention, there is provided a mold preheating method comprising: a cavity formed by clamping a fixed mold and a movable mold that faces the fixed mold and is capable of contacting and separating from the fixed mold. A mold preheating method for preheating the fixed mold and the movable mold before injecting a molten material into the mold, wherein the mold heating apparatus according to any one of claims 1 to 3 is used. The fixed mold and the movable mold are heated by being sandwiched between the fixed mold and the movable mold and disposed between the fixed mold and the movable mold. .

According to the mold heating apparatus according to the invention of claim 1 and the mold preheating method according to the invention of claim 4, since the heating sources of the fixed mold and the movable mold are infrared heaters, Unlike the case where gas is used as the heating source, it is possible to prevent the occurrence of fire due to gas leakage. Thereby, safety can be improved.
Furthermore, since the heat energy of the radiant heat of the infrared rays emitted from the infrared heater is not taken away by the air, the infrared rays can directly preheat the fixed mold and the movable mold. For this reason, it becomes possible to efficiently preheat the fixed mold and the movable mold.
According to the second and fourth aspects of the present invention, when the infrared light emitted from the infrared heater is irradiated to the stationary mold through the opening of the first facing surface, the stationary mold is preheated by the radiant heat of the infrared radiation. The At the same time, when the infrared light emitted from the infrared heater is irradiated to the movable mold through the opening of the second facing surface, the movable mold is preheated by the radiant heat of the infrared radiation. Therefore, both the fixed mold and the movable mold can be preheated simultaneously and efficiently.
According to the invention of claim 3 and claim 4, if the electric resistance value of the carbonaceous heating element is adjusted by the slit formed in the carbonaceous heating element, the temperature of the heat generated when the carbonaceous heating element is energized is reduced. It becomes possible to adjust. For this reason, by adjusting the electric resistance value, the wavelength region of infrared rays emitted from the carbonaceous heating element that changes according to the difference in temperature is easily absorbed by the fixed mold and the movable mold, It becomes possible to adjust to a region effective for heating.

It is a schematic plan view of the metal mold heating apparatus of embodiment of this invention. It is a schematic side view of a mold heating device. It is a schematic rear view of a mold heating device. It is a whole perspective view of a carbonaceous heating element with which an infrared heater built in a metallic mold heating device is provided. It is an enlarged view of the A part of FIG. It is a schematic perspective view which shows the state which spaced apart the upper mold | type with which the shaping | molding apparatus of a resin molded product is provided from the lower mold | die by predetermined distance. It is a schematic perspective view which shows the state which mounted the metal mold | die heating apparatus on the upper surface of the lower mold | type in the state which separated the upper mold | die from the lower mold | die by predetermined distance.

  An embodiment 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. The main body 2 is made of stainless steel, and is formed by assembling a lower main body 2A (see FIGS. 2 and 3) and an upper main body 2B (see FIGS. 2 and 3) that can be divided into two vertically. As shown in FIGS. 1 and 2, the main body 2 is hollow and is formed in a horizontally long box shape in a side view. 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.

  As shown in FIG. 1, the main body 2 is provided with a through space 6 in a portion excluding the front end portion (right side in FIG. 1) and the rear end portion (left side in FIG. 1). This penetration space 6 opens to the upper surface (front side of FIG. 1) of the main body 2 (upper main body 2B) and the lower surface (rear side of FIG. 1) of the main body 2 (lower main body 2A) so as to penetrate the main body 2. Is formed. Between the left edge (upper side in FIG. 1) and the right edge (lower side in FIG. 1) of the opening 9 on the upper surface, a rod-like guard member 11 made of stainless steel is provided in the front-rear direction (FIG. 1). And the left and right directions in FIG. Similarly to the case of the opening 9, a plurality of guard members 11 are spanned over the opening 10 on the lower surface. Furthermore, as shown in FIG. 2, a front partition wall 13 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. The front partition wall 13 includes a lower rib 13A (see FIG. 2) protruding upward from the inner bottom surface of the lower main body 2A and the upper main body in a state where the lower main body 2A and the upper main body 2B are assembled. It is formed by facing an upper rib 13B (see FIG. 2) projecting downward from the back side of the upper surface of 2B. Each rib 13A, 13B has a semicircular notch (not shown) at equal intervals in the short direction (vertical direction in FIG. 1) of the main body 2 (lower main body 2A, upper main body 2B). Are provided (six here). Thus, when the ribs 13A and 13B are opposed to each other, the front partition wall 13 is provided with six through holes 13C (see FIG. 2) that allow the through space 6 and the front end portion in the main body 2 to communicate with each other. .

  As shown in FIG. 2, in addition to the front partition wall 13, a rear partition wall 14 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. The rear partition wall 14 has a lower rib 14A (refer to FIG. 2) similar to the lower rib 13A and an upper rib 14B (refer to FIG. 2) similar to the upper rib 13B opposed to each other. Formed by. Similarly to the front partition wall 13, the rear partition wall 14 is provided with six through holes 14 </ b> C that allow the through space 6 to communicate with the rear end portion in the main body 2. Further, as shown in FIG. 3, a plurality of ventilation holes 19 are formed in the back surface 17 of the lower main body 2A and the back surface 18 of the upper main body 2B so as to communicate with the inside and the outside of each of the main bodies 2A and 2B. In this way, a plurality of ventilation holes 19 are formed on the back surface of the main body 2. As shown in FIG. 1, a plurality of long holes 19 are also formed on the upper surface (left side in FIG. 1) of the rear end portion of the main body 2 (upper main body 2B). In addition, a plurality of long holes (not shown) similar to the long holes 19 are formed on the lower surface of the rear end portion of the main body 2 (lower main body 2A). As shown in FIGS. 2 and 3, a heat shield wall 20 is provided on the upper surface of the main body 2 (upper main body 2 </ b> B) at the boundary between the rear end portion of the main body 2 and the through space 6. It is erected over a predetermined length in the direction. The heat shield wall 20 protects a power cord 4 described later from being damaged by the influence of radiant heat from the infrared heater 3. In addition, as shown in FIG. 2, sockets 22 having insertion ports 21 for the respective external connection terminals 28 of the infrared heater 3 to be described later are arranged at the rear end portion in the main body 2 so as to face the respective through holes 14. Has been. Here, two insertion ports 21 are provided in each socket 22 side by side in the lateral direction of the socket 22. Further, a stainless steel terminal block storage box 23 (see FIG. 2) is disposed on the upper surface of the main body 2 (upper main body 2B) on the rear end side of the main body 2 with respect to the heat shield wall 20. The terminal block storage box 23 stores terminal blocks (not shown) that are electrically connected to the sockets 22 by lead wires (not shown). As shown in FIGS. 1, 2, and 7, the upper surface (the upper side in FIG. 2), the right side surface (the diagonally left front side in FIG. 7), and the left side surface (the diagonally left rear side in FIG. 7) A plurality of ventilation holes 24 are formed.

  As shown in FIG. 1, the infrared heater 3 is formed in an elongated shape and is built in the main body 2. The infrared heater 3 is disposed in the through space 6 so as to face the opening 9 on the upper surface of the main body 2 and the opening 10 on the lower surface of the main body 2. Here, an example is shown in which six infrared heaters 3 are arranged in parallel in the transverse direction of the main body 2 in the through space 6. Each infrared heater 3 is formed by enclosing a long thin plate-like carbonaceous heating element 26 shown in FIG. 4 in an elongated glass tube 25 in which an inert gas is enclosed. In the present embodiment, as shown in FIG. 1, the carbonaceous heating elements 26 are arranged in two rows in the horizontal direction in the glass tube 25. As shown in FIG. 2, the front end face of each glass tube 25 is closed, and the opening of the rear end face of each glass tube 25 is closed by a base 27. As shown in FIGS. 1 and 2, the base 27 is provided with two external connection terminals 28, 28 protruding in the lateral direction of the base 27.

  In the glass tube 25, the two carbonaceous heating elements 26, 26 are electrically connected to each other by connecting the front end sides (the right side in FIG. 1) of the both carbonaceous heating elements 26, 26 with electric wires (not shown). Connected in series. On the other hand, the rear end side of each carbonaceous heating element 26 is electrically connected to each external connection terminal 28 by an electric wire (not shown).

  As shown in FIG. 2, in the main body 2, the front end side (right side in FIG. 2) of each glass tube 25 enters the front end portion of the main body 2 through each through hole 13 </ b> C, and the inner peripheral surface of each through hole 13 </ b> C and the glass tube A heat insulating material (not shown) is sandwiched between 25 outer peripheral surfaces. In addition, the rear end side (left side in FIG. 2) of each glass tube 25 enters the rear end portion of the main body 2 through each through hole 14C, and the inner peripheral surface of each through hole 14C and the outer periphery of the glass tube 25. A heat insulating material (not shown) is sandwiched between the surfaces. Thereby, the external connection terminals 28 and 28 of each infrared heater 3 are prevented from being damaged by the influence of the radiant heat of the infrared heater 3. The external connection terminals 28 and 28 of each infrared heater 3 can be inserted into and removed from the insertion ports 21 and 21 of each socket 22 at the rear end portion in the main body 2. For this reason, for example, when replacing the damaged infrared heater 3 with a good infrared heater 3, the connection between the infrared heater 3 and the socket 22 is established by removing the external connection terminals 28 and 28 from the insertion ports 21 and 21. It can be released easily. FIG. 2 shows a state in which the external connection terminals 28 and 28 are inserted into the insertion ports 21 and 21.

  As shown in FIG. 4, the carbonaceous heating element 26 provided in the infrared heater 3 is formed in a long thin plate shape. As will be described later, a current can be supplied to the carbonaceous heating element 26 from an electric cord 4 connected to a power source. As shown in FIGS. 4 and 5, the carbonaceous heating element 26 has a predetermined length in the front-rear direction (right oblique direction in FIG. 4), which is the longitudinal direction, from one side edge to the other side edge along the longitudinal direction. A plurality of slits 30 which are cut to the near side are alternately formed opposite to each other. When a plurality of slits 30 are formed in the carbonaceous heating element 26, the carbonaceous heating element 26 is provided with a current path that snakes in the longitudinal direction in a portion where the slit 30 is not cut. Then, by changing the distance between the slits 30 adjacent to each other in the longitudinal direction, the length of the energization path can be changed to adjust the electric resistance value of the carbonaceous heating element 26 to a desired value. In this embodiment, as an example, the thickness dimension t (see FIG. 5) of the carbonaceous heating element 26 is 0.6 mm, the width dimension is 9.6 mm, and the length dimension is 300 mm. Furthermore, the width dimension of each slit 30 was 0.3 mm, and the distance dimension B (see FIG. 5) between the slits 30 and 30 adjacent in the longitudinal direction was 3.6 mm.

  In this embodiment, since the thickness dimension (0.6 mm) of the carbonaceous heating element 26 is larger than the thickness dimension (0.3 mm as an example) of the carbonaceous heating element included in the conventional infrared heater, the carbonaceous heating element The electrical resistance value of the body 26 was made smaller than the resistance value of the carbonaceous heating element provided in the conventional infrared heater. Therefore, a large current can be passed through the carbonaceous heating element 26 as compared with the conventional carbonaceous heating element. As a result, the watt density of the infrared heater 3 of the present embodiment can be increased compared to the conventional infrared heater, and the surface temperature of the carbonaceous heating element 26 of the present embodiment can be increased compared to the surface temperature of the conventional carbonaceous heating element. Can be high. Here, the surface temperature of the carbonaceous heating element 26 can be increased from 1650 ° C. to 1800 ° C.

  As shown in FIGS. 1 and 2, the power cord 4 communicates with the terminal block housing box 23 and extends from the back to the rear of the terminal block housing box 23 and has a rectangular cross section and a cylindrical power cord protection. The member 35 is inserted. The front end of the power cord 4 (the right side in FIGS. 1 and 2) is inserted into the terminal block storage box 23, and the front end is connected to the connection terminal of the terminal block stored in the terminal block storage box 23. ing. As a result, the power cord 4 is connected to the terminal block, the sockets 22 electrically connected to the terminal block by lead wires, and the external connection terminals of the infrared heaters 3 inserted into the insertion ports 21 and 21 of the sockets 22. The carbonaceous heating elements 26 of the respective infrared heaters 3 are electrically connected via 28 and 28. Further, as shown in FIGS. 1 and 7, a plurality of ventilation holes 36 for communicating the inside and the outside of the power cord protection member 35 are formed on the upper surface of the power cord protection member 35. In addition, a plurality of long holes (not shown) similar to the long holes 36 are formed on the lower surface of the power cord protection member 35.

  Next, a method for preheating the mold using the above-described mold heating apparatus 1 will be described. FIG. 6 shows a molding apparatus 42 that includes a metal lower mold 40 as a fixed mold and a metal upper mold 41 as a movable mold to obtain a predetermined molded product. The lower die 40 and the upper die 41 are arranged so that the cavity surface 43 of the lower die 40 and the cavity surface (not shown) of the upper die 41 face each other in the vertical direction, and are lifted by a lifting device (not shown). The upper die 41 can be brought into and out of contact with the lower die 40. When the upper die 41 is moved close to the lower die 40 and the die is clamped by operating the lifting device, a cavity is formed by the cavity surface 43 of the lower die 40 and the cavity surface of the upper die 41. In the molding apparatus 42, after the upper mold 41 is clamped to the lower mold 40, for example, a molten resin material is injected into the cavity from the resin injection port of the lower mold 40. The resin material is solidified to obtain a predetermined molded product. In this embodiment, before the molten resin material is injected into the cavity, the lower mold 40 and the upper mold 41 are preheated by the mold heating apparatus 1 as described below. Thereby, since the fluidity | liquidity of the resin material in a cavity increases, as a result of preventing insufficient filling of the resin material in a cavity, the molding defect of a molded product can be suppressed.

  Before the preliminary heating of the lower mold 40 and the upper mold 41, as shown in FIG. 6, the lifting device is operated to fix the upper mold 41 in a state separated from the lower mold 40 by a predetermined distance. Thereafter, the operator places the mold heating device 1 on the upper surface of the lower mold 40 so as to close the cavity surface 43 while holding the power cord protection member 35 (see FIG. 7) by hand. Subsequently, the lifting device is operated to bring the upper mold 41 close to the mold heating apparatus 1, and the mold heating apparatus 1 is sandwiched between the lower mold 40 and the upper mold 41. In this way, the mold heating device 1 is disposed between the lower mold 40 and the upper mold 41. Thereby, the lower surface of the main body 2 faces the lower mold 40, and the upper surface of the main body 2 faces the upper mold 41. In addition, the lower surface of the main body 2 is an example of the 1st opposing surface of this invention, and the upper surface of the main body 2 is an example of the 2nd opposing surface of this invention.

  Thereafter, when the power cord 4 of the mold heating apparatus 1 is connected to the power source, the external connection terminals 28 and 28 of the infrared heaters 3 electrically connected to the power cord 4 from the power cord 4 (FIGS. 1 and 2), current is supplied to the carbonaceous heating elements 26, 26 of each infrared heater 3. Then, each carbonaceous heating element 26 is red hot and generates infrared rays. This infrared ray is applied to the upper die 41 through a plurality of guard members 11, 11 (see FIG. 1) spanned through the opening 9 (see FIGS. 1 and 7) of the mold heating device 1. As a result, the upper mold 41 can be preheated by infrared radiant heat. At the same time, the infrared rays emitted from the carbonaceous heating elements 26 irradiate the lower mold 40 through a plurality of guard members 11 and 11 that are spanned across the opening 10 (see FIG. 1) of the mold heating device 1. Is done. As a result, the lower mold 40 can also be preheated by infrared radiation 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 lower mold 40 and upper mold 41. Thereby, even compared with the conventional mold heating burner device, the lower mold 40 and the upper mold 41 can be efficiently heated to a predetermined temperature in a short time. Furthermore, since the heat energy of the radiant heat of the infrared rays is not taken away by the air, there is an advantage that the lower die 40 and the upper die 41 can be preheated directly by the infrared rays.

  Further, in the mold heating apparatus 1, during the preliminary heating of the lower mold 40 and the upper mold 41, the upper and lower surfaces of the rear end portion of the main body 2 and the long holes 19 for ventilation formed in the rear surface of the main body 2 It becomes possible to introduce air into the rear end portion of 2 and distribute it. Therefore, the air flowing through the rear end portion in the main body 2 can be used to cool the sockets 22 serving as heat generating components and the external connection terminals 28 and 28 of the infrared heaters 3. Further, the terminal accommodating box 23 (see FIGS. 2 and 7) also has a ventilation hole 24 formed on the upper surface and the left and right side surfaces thereof, and the elongated hole 24 is taken into the terminal accommodating box 23. The terminal block, which is a heat generating component, can be cooled by air. As described above, in the mold heating apparatus 1, for example, a cooling fan that sends cooling air to the heat generating components such as the external connection terminals 28 and 28 of each infrared heater 3, and cooling water near the external connection terminals 28 and 28. The external connection terminals 28, 28, etc. can be cooled by the air taken into the rear end portion of the main body 2 from the long hole 19 for ventilation or from the long hole 24 for ventilation. There is an advantage that the terminal block can be cooled by the air taken into the terminal housing box 23. Further, the radiant heat of each infrared heater 3 is increased by increasing the distance from the effective heat generating portion of each infrared heater 3 to the external connection terminals 28 and 28 while ensuring the desired watt density for each infrared heater 3. Is difficult to be transmitted to the external connection terminals 28, 28. In addition, the outer periphery of the power cord 4 is made to pass by the air taken into the power cord protecting member 35 from the ventilation holes 36 formed in the upper and lower surfaces of the power cord protecting member 35 (see FIGS. 1 and 7). Cooling. Thereby, the heat_generation | fever of the power cord 4 can be suppressed.

  When the temperature of the lower mold 40 and the upper mold 41 is raised to a predetermined temperature by the preheating described above, the lifting device is operated to move the upper mold 41 from the lower mold 40 by a predetermined distance as shown in FIG. Fix in a separated state. Thereafter, the operator takes out the mold heating apparatus 1 from between the lower mold 40 and the upper mold 41 while holding the power cord protection member 35 (see FIG. 7) by hand. As shown in FIGS. 1 and 7, when a plurality of guard members 11 are passed over the openings 9 and 10 of the mold heating device 1, the operator's hand accidentally enters the through space 6 from the openings 9 and 10. It is prevented from entering. This prevents the operator's hand from accidentally touching the infrared heater 3 and causing burns.

<Effect of this embodiment>
In the mold heating apparatus and the mold preheating method according to the present embodiment, the heating source of the lower mold 40 and the upper mold 41 is the infrared heater 3, and therefore, a case where gas is used as the conventional heating source. Unlike, it can prevent the occurrence of fire due to gas leakage. Thereby, safety can be improved.
Furthermore, since the heat energy of the radiant heat of infrared rays emitted from each infrared heater 3 is not taken away by the air, the infrared rays can directly preheat the lower mold 40 and the upper mold 41. For this reason, the lower mold 40 and the upper mold 41 can be efficiently preheated.

  Moreover, when the infrared rays emitted from the respective infrared heaters 3 are applied to the lower die 40 through the opening 10 on the lower surface of the main body 2 of the mold heating device 1, the lower die 40 is preheated by the radiant heat of the infrared rays. At the same time, when the infrared rays emitted from the respective infrared heaters 3 are applied to the upper die 41 through the opening 9 on the upper surface of the main body 2 of the mold heating device 1, the upper die 41 is preheated by the radiant heat of the infrared rays. . Therefore, both the lower mold 40 and the upper mold 41 can be preheated simultaneously and efficiently.

  Furthermore, if the electric resistance value of each carbonaceous heating element 26 is adjusted by the slits 30 formed in each carbonaceous heating element 26, the surface temperature of the carbonaceous heating element 26 during energization of each carbonaceous heating element 26 can be reduced. It becomes possible to adjust. For this reason, by adjusting the electrical resistance value, the wavelength range of infrared rays emitted from the carbonaceous heating elements 26 that change according to the difference in the surface temperature can be easily absorbed by the lower mold 40 and the upper mold 41. It becomes possible to adjust to the area | region effective for the heating of the metal mold | die 40,41.

  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 the above-described embodiment, the infrared heater 3 has shown the example in which the carbonaceous heating elements 26 are arranged in two rows in the glass tube 25, but the present invention is not limited thereto. For example, the infrared heater 3 may be configured by arranging one carbonaceous heating element 26 in the glass tube 25. Unlike the above-described embodiment, the mold heating device may include an infrared heater in which a tungsten filament as a heating element is disposed in the glass tube 25 instead of the carbonaceous heating element 26. In addition to this, the mold heating device may include an infrared heater in which a nichrome wire or an iron chrome wire as a heating element is disposed in a glass tube that does not enclose an inert gas.

  Furthermore, in the above-described embodiment, an example in which six infrared heaters 3 are arranged in parallel in the transverse direction of the main body 2 in the through space 6 of the mold heating device 1 is shown, but the present invention is not limited thereto, and preheating is performed. In accordance with the size of the main body 2 corresponding to the size of the mold, the infrared heaters 3 may be arranged in the through space 6 in parallel with 5 or less or 7 or more in the short direction. In addition, unlike the embodiments described above, the mold heating device is sandwiched between a pair of molds that can be contacted and separated in the left-right direction, and the pair of molds is preheated by the mold heating device. Also good. In addition, unlike the embodiment described above, a predetermined metal component may be formed by injecting molten metal under pressure into a cavity formed by the lower mold 40 and the upper mold 41. Good.

  1 .. Mold heating device, 2 .. Main body of mold heating device, 6 .. Opening space, 9 .. Opening of upper surface of main body, 10 .. Opening of lower surface of main body, 25. -Carbonaceous heating element, 30 ... Slit of carbonaceous heating element, 40 ... Lower mold, 41 ... Upper mold, 43 ... Lower cavity surface.

Claims (4)

Before injecting the molten material into a cavity formed by clamping a fixed mold and a movable mold that faces the fixed mold and is movable toward and away from the fixed mold, the fixed mold A mold heating device that is sandwiched between the fixed mold and the movable mold, and preheats the fixed mold and the movable mold,
An infrared heater that encloses a carbonaceous heating element in a glass tube and irradiates infrared rays to the stationary mold and the movable mold by energizing the carbonaceous heating element to heat the stationary mold and the movable mold. Mold heating device characterized by being built-in. The main body containing the infrared heater is provided with a through space penetrating through the main body by opening in a first opposing surface facing the fixed mold and a second opposing surface facing the movable mold,
2. The mold heating apparatus according to claim 1, wherein the infrared heater is disposed in the penetration space so as to face the opening of the first facing surface and the opening of the second facing surface.   The carbonaceous heating element is formed into a long thin plate shape, and the carbonaceous heating element is cut into the carbonaceous heating element from one side edge along the longitudinal direction of the carbonaceous heating element to the front of the other side edge. 3. The mold heating apparatus according to claim 1, wherein slits capable of adjusting an electric resistance value of the heating element are alternately formed opposite to each other. Before injecting the molten material into a cavity formed by clamping a fixed mold and a movable mold that faces the fixed mold and is movable toward and away from the fixed mold, the fixed mold And a mold preheating method for preheating the movable mold,
The mold heating apparatus according to any one of claims 1 to 3, wherein the mold heating device is sandwiched between the fixed mold and the movable mold, and is disposed between the fixed mold and the movable mold. A method for preheating a mold, wherein the fixed mold and the movable mold are heated.

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