JP2010018463A - Molding die for optical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die for an optical element where multi-cavity number can be easily altered and where a vent path to introduce a gas in the molding die outside can be certainly ensured even when the multi-cavity number is large in multi-cavity press-molding. <P>SOLUTION: The molding die for the optical element icnludes f upper dies 110 and lower dies 120, a plurality of barrel dies 130 having through-holes 132 intercalated with the upper die and the lower die in each set at a slidable state and adjoining each other and communicating paths 136, 138 arranged at each barrel die so that molding spaces 150 formed in the through-hole at each barrel die by the upper die and the lower die in each set intercalated in the through-hole at each barrel die communicate to the outside of a plurality of the barrel dies adjoining each other. In the molding die, a plurality of the barrel dies can be set as any number of the barrel dies and can be arranged so as to constitute any shape adjoining each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molding die for optical elements, and more particularly to a molding die for optical elements that enables multi-cavity press molding.

  In recent years, glass optical elements such as lenses, prisms, and optical communication parts that require high optical properties have been mass-produced by press molding. In press molding, a molding material (preform) formed in a predetermined shape is prepared, and the molding material is placed in an optical element molding die (hereinafter also referred to as a molding die) having a high-precision molding surface. To do. And an optical element is shape | molded by pressing after heating a shaping | molding raw material to the temperature of the yield point vicinity of glass through a shaping | molding die, and transferring the shape of a shaping | molding surface to a shaping | molding raw material.

  In order to improve productivity by press molding, there is known a mold that incorporates a plurality of sets of upper molds and lower molds into a single body mold and enables press molding of multiple pieces. This type of mold is generally divided into a separate type and a barrel type.

  In a separate type mold, an upper mold die provided with a plurality of upper molds and a lower mold die provided with a plurality of lower molds are used. Then, a molding material is disposed between the upper mold and the lower mold, and the optical element is molded on the mating surface of the upper mold die and the lower mold die. In the separate mold, the molding material placed on the molding part of the lower mold die is pressed and deformed until the mating surfaces are brought together as the upper mold die and the lower mold die approach. In this case, an air passage that leads from the molding space to the outside is secured by the gap between the upper mold die and the lower mold die until the mating surfaces are brought together.

  On the other hand, in the body-type mold, for example, as described in Patent Document 1 below, a common body mold having a plurality of through holes through which a plurality of sets of upper molds and lower molds are slidable is used. It is done. The common cylinder mold is formed with a vent hole communicating with the outside of the common cylinder mold through a molding space formed in the through hole by the molding surfaces of the upper mold and the lower mold. In the barrel-type mold, the axis deviation, inclination, and stroke of the upper mold and the lower mold are regulated (adjusted) based on the shape of the common barrel mold, so higher accuracy is required compared to the separate mold. It is often used when molding an optical element.

JP 2006-240913 A

  By the way, in multi-cavity press molding, in order to improve the utilization efficiency of the molding equipment and the production efficiency of optical elements, the number of multi-cavity changes is changed according to the type of molding equipment, production requirements of optical elements, etc. It may be desirable to do so. However, for example, in the conventional body mold, the number of through holes provided in the common body mold is fixed, so it is not easy to change the number of multi-cavities (especially increase the number). Absent. In general, since the shapes of the upper mold and the lower mold differ depending on the mold, it is difficult to share the upper mold and the lower mold between different molds.

  On the other hand, when the number of sets of the upper mold and the lower mold is increased in order to increase the number of multi-cavities, it is difficult to ensure air permeability in the mold. In a conventional barrel-type mold, when a plurality of upper and lower molds are arranged concentrically, for example, it is difficult to provide a vent hole in a through hole arranged on the inner side due to restrictions on arrangement of the through holes. Further, if the distance between the through holes is increased in order to eliminate the restriction on the arrangement, the mold becomes large and the heat transfer efficiency in the mold decreases.

  Therefore, in the conventional barrel-type mold, the number of multi-cavity cannot be easily changed, and when the number of multi-cavity increases, it becomes impossible to reliably secure an air passage for guiding the gas in the mold to the outside. There was a problem.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to easily change the number of multi-cavity in multi-cavity press molding and to form a large number of multi-cavity. It is an object of the present invention to provide a new and improved optical element mold capable of reliably securing a ventilation path for guiding gas in a mold to the outside.

  In order to solve the above-described problems, according to one aspect of the present invention, there are a plurality of sets of upper molds and lower molds, and through holes into which each set of upper molds and lower molds are slidable. A molding space formed in each through hole of each body mold by a plurality of body molds arranged in close contact with each other and each upper mold and lower mold inserted in each through hole of each body mold are in close contact with each other. There is provided an optical element molding die including a communication path provided in each barrel mold so as to communicate with the outside of the plurality of barrel molds arranged in this manner.

  According to such a configuration, the mold is composed of a plurality of sets of upper mold, lower mold, and barrel mold, and the plurality of barrel molds are arranged in close contact with each other. The number of multi-pieces can be easily changed. Further, since the molding space formed in the through holes of the plurality of barrel molds communicates with the outside of the plurality of trunk molds arranged in close contact with each other by the communication passage, the gas in the molding mold is guided to the outside. An air passage can be ensured reliably.

  The communication path has a hole portion that communicates the molding space with the side surface of each barrel mold, and a groove portion that communicates with the hole portion and is provided on the side surface of each barrel mold. It may be provided so as to communicate with other trunk-shaped grooves arranged in this manner. As a result, the molding spaces in the plurality of cylinder dies communicate with the outside of the plurality of cylinder dies arranged in close contact with each other through the holes and grooves of the cylinder dies through the grooves of the other cylinder dies.

  Moreover, each said trunk | drum may have a regular polygonal column shape. As a result, a plurality of barrel molds can be arranged in close contact with each other, so that the number of multi-cavities is increased without increasing the size of the mold and reducing the heat transfer efficiency in the mold. be able to.

  Each of the barrel molds has a positioning engagement portion provided on a side surface, and the barrel positioning engagement portion engages with a positioning engagement portion of another barrel mold arranged in close contact with each other. It may be provided as follows. As a result, the positional deviation that occurs between the adjacent barrel molds is regulated by the positioning engagement portion, so that the axial displacement between the upper and lower molds is less likely to occur, and the gap between the adjacent groove molds is less likely to occur. Become.

  Further, the plurality of trunk molds may have the same shape. The plurality of trunk molds may be arranged concentrically and closely to each other. In addition, the optical element molding die may further include a holding portion that holds the contour shapes of a plurality of trunk molds arranged in close contact with each other.

  According to the present invention, in the multi-cavity press molding, the number of multi-cavity can be easily changed, and even if the number of multi-cavity is large, the air passage for guiding the gas in the mold to the outside can be surely provided. A mold for optical elements that can be secured can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  The optical element molding die 100 (hereinafter also referred to as the molding die 100) according to the first embodiment of the present invention is a body type molding die 100 that enables multi-cavity press molding. Below, it demonstrates, contrasting the shaping | molding die 500 which concerns on a prior art, and the shaping | molding die 100 which concerns on 1st Embodiment.

(Forming mold according to the prior art)
FIG. 10 is a schematic view showing a press forming apparatus including a forming die 500 according to the prior art, and FIG. 11 is a perspective view showing the forming die 500 shown in FIG.

  As shown in FIG. 10, the press forming apparatus includes a forming die 500, an upper plate 10, a lower plate 12, a heating lamp 14, a heat insulating cylinder 16, an upper shaft 18, a lower shaft 20, a driving device 22, a load detecting device 24, and a control. The apparatus 26 is comprised.

  A lower plate 12 supported by the lower shaft 20 is disposed below the molding die 500, and an upper plate 10 supported by the upper shaft 18 is disposed above the molding die 500. Around the mold 500, a heating lamp 14 is arranged. Around the mold 500, the upper plate 10, the lower plate 12, and the heating lamp 14, the mold 500, the upper plate 10, the lower plate 12, and the heating lamp 14 are arranged. The heat insulation cylinder 16 surrounding the molding chamber 28 including the is disposed. The drive device 22 raises and lowers the lower plate 12 via the lower shaft 20, and the load detection device 24 detects a press load. The control unit 26 determines the heating lamp 14, the driving device 22, a cooling device (not shown) and a purge according to the detected temperature of a thermocouple (not shown) mounted on the mold 500, the detected load of the load detecting device 24, and the like. Control devices. The molding die 500 placed on the lower plate 12 is pressed against the upper plate 12 as the lower plate 12 moves up, and presses the molding material 1 placed in the molding space 550.

  As shown in FIGS. 10 and 11, the conventional mold 500 includes a plurality of sets of an upper mold 510 and a lower mold 520, a common body mold 530, and a holding table 540. The upper mold 510 and the lower mold 520 include cylindrical body portions 512 and 522 and flange portions 514 and 524 provided at one end of the body portions 512 and 522, and a molding surface 516 is formed at the other end of the body portions 512 and 522. 526 are provided. The common trunk mold 530 has a cylindrical shape, and has a plurality of through holes 532 provided on the same circumference, and a vent hole provided from the hole surface of the through hole 532 toward the outer peripheral surface of the common trunk mold 530. 536. Further, the common body mold 530 has a flange receiving portion 534 provided at the upper end of the through hole 532 in a cross section larger than the through hole 532 and a flange receiving portion 535 (not shown) provided at the lower end of the through hole 532 in the same manner. Have. The holding table 540 holds the lower mold 520 and the common same mold 530 while supporting the lower surfaces of the lower mold 520 and the common trunk mold 530.

  When the mold 500 is assembled, the plurality of lower molds 520 are assembled such that the lower surface of the flange portion 524 is against the upper surface of the holding table 540. The common cylinder mold 530 has a lower surface in contact with the upper surface of the holding base 540, a lower surface of the flange receiving portion 535 is in contact with an upper surface of the flange portion 524 of the lower mold 520, and a hole surface of the through hole 532 is a main body portion of the lower mold 520. The holder 540 and the lower mold 520 are assembled so as to be in sliding contact with the peripheral surface of 522. The plurality of upper molds 510 are assembled to the common body mold 530 so that the peripheral surface of the main body portion 512 is in sliding contact with the hole surface of the through hole 532. In a state where the mold 500 is assembled, a molding space 550 is formed in the common barrel mold 530 by the molding surface 516 of the upper mold 510, the molding surface 526 of the lower mold 520, and the hole surfaces of the through holes 532. Each molding space 550 in the common cylinder mold 530 is communicated with the outside of the common cylinder mold 530 through the vent holes 536.

  In a press molding apparatus having a conventional mold 500, a press molding process including a pretreatment process, a purge process, a heating process, a pressing process, a cooling process, and a post-processing process is performed. In the pretreatment step, the molding material 1 is disposed on the molding surface 526 of the plurality of lower molds 520 in a state where the holding table 540, the plurality of lower molds 520, and the common body mold 530 are assembled, and the plurality of upper molds 510 are disposed. Are assembled. Here, the upper mold 510 is assembled to the common body mold 530 in a state where the molding surface 516 is in contact with the molding material 1 and the lower surface of the flange portion 514 is not in contact with the upper surface of the flange receiving portion 534. In the purge process, the air in the molding chamber 28 is replaced with an inert gas, and the air in the molding space 550 is also replaced with an inert gas through the vent hole 536.

  In the heating step, the molding material 1 is heated to a temperature near the yield point of the glass through the molding die 500 by the heating lamp 14 arranged around the molding die 500. In the pressing step, the upper mold 510 and the lower mold 520 are pressed to transfer the molding surfaces 516 and 526 of the upper mold 510 and the lower mold 520 to the molding material 1. Here, in the upper die 510, the lower surface of the flange portion 514 comes into contact with the upper surface of the flange receiving portion 534, so that the press amount with respect to the lower die 520 is regulated. In addition, the gas confined in the molding space 550 is discharged to the outside of the common barrel mold 530 through the vent hole 536.

  In the cooling process, a cooling gas is supplied into the molding chamber 28, and the optical element molded from the molding material 1 is cooled to a predetermined cooling temperature. In the post-processing step, the plurality of upper molds 510 or the common body mold 530 and the plurality of upper molds 510 are removed from the mold 500, and the plurality of optical elements are taken out from the plurality of lower molds 520.

  Here, in order to increase the number of multi-pieces, a plurality of sets of upper mold 510 and lower mold 520 are concentrically (on a plurality of circumferences) using a conventional mold 500 as shown in FIGS. ) Is assumed. When vent holes 536 are provided from the plurality of concentrically arranged through holes 532 toward the outer peripheral surface of the common body mold 530, as in the case of the conventional mold 500, the through holes 532 are penetrated due to restrictions on the arrangement of the through holes 532. It becomes necessary to increase the distance between the holes 532, leading to an increase in the size of the mold 500 and a decrease in heat transfer efficiency in the mold 500. It is also conceivable to use the cylindrical common trunk mold 530 to provide the vent hole 536 from the through hole 532 arranged on the inner circumference toward the inner circumferential surface of the common trunk mold 530. The result will be similar to the case.

(Mold 100 according to the first embodiment)
FIG. 1 is a schematic view showing a mold 100 according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing the mold 100 shown in FIG.

  As shown in FIGS. 1 and 2, the mold 100 according to the first embodiment includes a plurality of sets of an upper mold 110 and a lower mold 120, a plurality of trunk molds 130, and a holding table 140. The upper mold 110 and the lower mold 120 are composed of main body portions 112 and 122 and flange portions 114 and 124, as in the conventional mold 500. The body mold 130 has a hexagonal columnar shape (regular hexagonal cross-sectional shape), and includes a through hole 132, flange receiving portions 134 and 135 (see FIG. 4), and a hole portion 136 that constitutes a communication passage whose details will be described later. A groove 138 is provided. The holding table 140 holds the contour shape of the body mold 130 and supports the lower surface of the flange portion 124 of the lower mold 120 to transmit the pressing force during molding to the lower mold 120. In the mold 100, the number of sets of the upper mold 110, the lower mold 120, and the body mold 130 and the shape of the holding table 140 are changed according to the type of molding apparatus and the required production amount of optical elements. Thus, the number of multiple pieces can be easily changed.

  FIG. 3 is an exploded perspective view showing a main part of the mold 100 shown in FIG. FIG. 4 is an explanatory view showing the structure of the body mold 130 constituting the mold 100 shown in FIG. FIG. 4 shows a top surface, a bottom surface, two side surfaces, and a cross section along the line AA of the body mold 130. FIG. 5 is an explanatory view showing a communication path constituted by a plurality of trunk molds 130 having the structure shown in FIG. FIG. 5 shows a cross section along the communication path in a plurality of trunk molds 130 arranged concentrically and closely to each other as shown in FIG. 1 (corresponding to a cross section along the line AA shown in FIG. 4). It is shown.

  3 and 4, the body mold 130 has a hexagonal columnar shape (regular hexagonal cross-sectional shape), and is provided so that the main body portions 112 and 122 of the upper mold 110 and the lower mold 120 are inserted. And a hole 136 and a groove 138 constituting the communication path. In addition, the body mold 130 includes a flange receiving part 134 provided so that the flange part 114 of the upper mold 110 is fitted to the upper end of the through hole 132, and the flange part 124 of the lower mold 120 similarly to the lower end of the through hole 132. Has a flange receiving portion 135 provided to fit. The trunk mold 130 may have a cross-sectional shape with chamfered corners. A molding space 150 is formed in the body mold 130 by the molding surfaces 116 and 126 of the upper mold 110 and the lower mold 120 and the hole surfaces of the through holes 132.

  The communication path includes a hole 136 communicating the molding space 150 with the side surface of the body mold 130, and a groove 138 provided on the side surface of the body mold 130 in communication with the hole 136. The hole 136 is a fine hole configured so that the heat-softened molding material 1 does not flow out, and is provided so that one end opens into the molding space 150 and the other end opens into the groove 138. 3 and 4 show the body mold 130 provided with the six hole portions 136 communicating with the groove portions 138 provided on the respective side surfaces of the body mold 130. The hole 136 may be provided so as to communicate with the groove 138 provided on the side surface of the body mold 130. As shown in FIG. 5, the groove portion 138 is a groove portion 138 of one body mold 130 provided on the contact surface between the body molds 130 in the body mold 130 arranged in close contact with each other. 138 is provided to communicate with 138. It should be noted that the groove portions 138 of the barrel mold 130 that are in close contact with each other may be provided so as to face each other or may be provided so as to intersect with each other.

  The communication path is provided so that the molding space 150 formed in the through holes 132 of the plurality of barrel molds 130 communicates with the outside of the plurality of barrel molds 130 arranged in close contact with each other (outside the molding die 100). It is done. In other words, in the case shown in FIG. 5, the communication passages in the plurality of trunk molds 130 arranged concentrically and closely to each other are arranged in the seven trunk molds 130 arranged on the inner circumference and in the central portion. The molding space 150 is provided so as to communicate with the outside of the twelve barrel molds 130 arranged concentrically on the outside (outside of the molding die 100).

  When assembling the molding die 100, the plurality of lower dies 120 are assembled such that the lower surface of the flange portion 124 is against the upper surface of the holding table 140. The lower surface of the body mold 130 is in contact with the upper surface of the holding table 140, the lower surface of the flange receiving portion 135 is in contact with the upper surface of the flange portion 124 of the lower mold 120, and the hole surface of the through hole 132 is the main body portion 122 of the lower mold 120. It is assembled with respect to the holding stand 140 and the lower mold 120 so as to be in sliding contact with the peripheral surface. Further, the trunk molds 130 are arranged so as to be in close contact with each other concentrically. The plurality of upper molds 110 are assembled to the body mold 130 so that the peripheral surface of the main body 112 is in sliding contact with the hole surface of the through hole 132. The molding spaces 150 in the plurality of trunk molds 130 communicate with the outside of the plurality of trunk molds 130 arranged concentrically through a communication path.

  Next, a press forming process performed by a press forming apparatus having the forming die 100 will be described. The press forming apparatus having the forming die 100 has basically the same configuration as the press forming apparatus shown in FIG. In the pretreatment step, the molding material 1 is arranged on the molding surface 126 of the plurality of lower molds 120 in a state where the holding stand 140, the plurality of lower molds 120, and the plurality of body molds 130 are assembled, and a plurality of upper molds are arranged. 110 is assembled.

  In the purge process, so-called evacuation is performed by discharging the air in the molding chamber 28 and the molding space 150 in advance. Here, the molding space 150 in each of the seven cylinder dies 130 arranged on the inner circumference and in the central part is formed in the hole 136 and the groove 138 of each cylinder 130 and in the other cylinder dies 130. The space 150 (the gap between the molding surfaces 116 and 126 and the molding material 1), the hole 136, and the groove 138 communicate with the outside of the twelve body molds 130 arranged on the outer circumference (outside the molding die 100). is doing. Further, the molding spaces 150 in each of the twelve body molds 130 arranged on the outer circumference are formed in the hole 136 and the groove 138 of each cylinder mold 130, or the hole 136, or in another cylinder mold 130. The molding space 150 (the gap between the molding surfaces 116 and 126 and the molding material 1), the hole 136 and the groove 138 communicate with the outside of the molding die 100. Thereby, the air in the molding space 150 can be smoothly discharged to the outside of the mold 100 through the hole 136 and the groove 138.

  Then, after evacuation is performed, an inert gas is introduced into the molding chamber 28 and the molding space 150 to perform purging. Here, as in the case of evacuation, the inert gas can be smoothly introduced into the molding space 150 through the hole 136 and the groove 138. In the above description, the purge process is performed. However, the following molding process may be performed in a vacuum without introducing an inert gas after evacuation.

  In the heating process, the molding material 1 is heated to a temperature near the yield point of the glass through the molding die 100 (heat transfer in the molding die 100) by the heating lamp 14 disposed around the molding die 100.

  In the pressing process, the upper mold 110 and the lower mold 120 are pressed to transfer the molding surfaces 116 and 126 of the upper mold 110 and the lower mold 120 to the molding material 1. The gas confined in the molding space 150 is discharged to the outside of the body mold 130 disposed on the outer circumference through the communication path. Here, the molding space 150 in each of the seven body molds 130 arranged on the inner circumference and in the center part is formed with holes 136 and grooves 138 of each body mold 130 and holes of other body molds 130. 136 and the groove portion 138 communicate with the outside of the twelve body molds 130 arranged on the outer circumference (outside of the mold 100). Further, the molding spaces 150 in each of the twelve barrel molds 130 arranged on the outer circumference communicate with the outside of the molding die 100 through the holes 136 and the groove portions 138 of each barrel mold 130. Thereby, the gas confined in the molding space 150 through the hole 136 and the groove 138 can be smoothly discharged to the outside of the mold 100.

  In the cooling process, cooling gas is supplied into the molding chamber 150, and the optical element molded from the molding material 1 is cooled to a predetermined cooling temperature through the molding die 100 (heat transfer in the molding die 100). Here, as in the purge step, the hot air in the molding space 150 is smoothly discharged to the outside of the mold 100 through the hole 136 and the groove 138, and then the groove 138 formed on the side surface of the body mold 130. Thus, the cooling gas can be smoothly introduced to the inside of the molding space 150, and the cooling efficiency can be improved.

  In the post-processing step, the plurality of upper molds 110, or the plurality of trunk molds 130 and the plurality of upper molds 110 are removed from the mold 100, and the plurality of optical elements are taken out from the plurality of lower molds 120. In the heating process and the cooling process, there is a difference in temperature change between the trunk mold 130 disposed on the inner circumference and the central portion and the trunk mold 130 disposed on the outer circumference. However, a temperature change is suppressed by providing a soaking step.

  As described above, according to the molding die 100 according to the first embodiment, the molding die 100 includes the plurality of sets of the upper die 110, the lower die 120, and the trunk die 130, and the plurality of trunk die 130 are mutually connected. Since they are closely arranged, the number of multi-pieces can be easily changed according to the type of molding apparatus, production requirements, and the like. Further, the molding spaces 150 formed in the through holes 132 of the plurality of barrel molds 130 by the communication passages (the hole portions 136 and the groove portions 138) are arranged outside the plurality of barrel molds 130 (molding dies) arranged in close contact with each other. 100), the air passage for guiding the gas in the mold 100 to the outside can be surely secured.

  In the above description, the case where the body mold 130 has a hexagonal column shape (regular hexagonal cross-sectional shape) and a plurality of body molds 130 are arranged in close contact with each other concentrically, For example, it may have other shapes as shown in FIGS. In addition, the shape of the trunk | drum shown in FIG. 6 and FIG. 7 is an illustration to the last, and a trunk | drum may have the shape of another regular polygon. 6 and 7 are explanatory views showing the configuration of the communication path in the molds 200 and 300 having a structure different from the structure shown in FIG. In the following, the molds 200 and 300 shown in FIGS. 6 and 7 will be described, but the description overlapping with the mold 100 shown in FIG. 1 will be omitted.

  The forming die 200 shown in FIG. 6 includes a plurality of body dies 230 having a triangular prism shape (regular triangle cross-sectional shape). The trunk mold 230 shown in FIG. 6 includes a through hole 232, a hole 236 that constitutes a communication path, and a groove 238, and the communication path is configured by a plurality of trunk molds 230 that are concentrically arranged closely to each other. Has been. The communication path is formed by forming molding spaces 250 in six barrel molds 230 arranged on the inner circumference to the outside of the eighteen molds 230 arranged on the outer circumference (outside the molding die 200). It is formed so as to communicate.

  A mold 300 shown in FIG. 7 includes a plurality of barrel molds 330 having a quadrangular prism shape (square cross-sectional shape). The trunk mold 330 shown in FIG. 7 also includes a through-hole 332, a hole 336 and a groove 338 constituting a communication path, and a plurality of trunk molds 330 arranged concentrically and closely to each other constitute a communication path. Has been. The communication path is formed by passing the molding spaces 350 in the four cylinder molds 330 arranged on the inner circumference to the outside of the twelve cylinder molds 330 arranged on the outer circumference (outside the mold 300). It is formed so as to communicate.

(Modification)
FIG. 8 is an explanatory view showing a mold 200 ′ according to a modification of the first embodiment. FIG. 8 shows a communication path constituted by a plurality of trunk molds 230 and 230 ′, as in the case of FIGS. In the mold 200 according to the above embodiment, a plurality of trunk molds 230 having the same shape are arranged in close contact with each other. On the other hand, in the molding die 200 ′ according to this modification, a plurality of trunk molds 230, 230 ′ having different shapes are arranged in close contact with each other.

  For example, in the mold 200 ′ shown in FIG. 8, the six cylinder molds 230 arranged inside among the plurality of cylinder molds 230 constituting the mold 200 shown in FIG. 6 have a hexagonal column shape (regular hexagonal cross-sectional shape). Eighteen body dies 230 having a triangular shape (regular triangle cross-sectional shape) are closely arranged around the body dies 230 ′. Note that the mold 200 'may be configured to include a plurality of integrated body molds 230'. The hexagonal columnar body 230 ′ is provided with six through holes 232 arranged in a hexagonal shape, and each through hole 232 is provided on the outer periphery of the body mold 230 ′ from the hole surface of each through hole 232. Six holes 236 communicating with the groove 238 are provided. The groove portion 238 of the hexagonal columnar body mold 230 ′ is provided so as to communicate with the groove portion 238 of each of the triangular columnar body molds 230 arranged closely. Accordingly, the through holes 232 provided in the plurality of body molds 230 and 230 ′ constituting the molding die 200 ′ are communicated with each other through the communication path (hole portion 236 and groove portion 238).

  According to such a configuration, it is possible to easily increase the number of multi-pieces by combining the integrated body mold 230 ′ and the non-integrated body mold 230, or combining the integrated body molds 230 ′. It is possible to change, and it is possible to reliably secure a ventilation path that guides the gas in the mold 200 ′ to the outside.

(Mold 400 according to the second embodiment)
FIG. 9 is an exploded perspective view showing a main part of a mold 400 according to the second embodiment of the present invention. Below, although the shaping | molding die 400 which concerns on 2nd Embodiment is demonstrated, the description which overlaps with the shaping | molding die 100 which concerns on 1st Embodiment is abbreviate | omitted.

  A mold 400 shown in FIG. 9 includes a plurality of sets of upper mold 410 and lower mold 420 and a plurality of barrel molds 430. The upper mold 410 and the lower mold 420 include main body portions 412 and 422, flange portions 414 and 424, and molding surfaces 416 and 426, and the body die 430 has a hexagonal columnar shape (regular hexagonal cross-sectional shape). It has a through hole 432, flange receiving portions 434 and 435 (not shown), and a hole portion 436 and a groove portion 438 that constitute a communication path. In the body mold 430, a molding space 450 is formed by the molding surfaces 416 and 426 of the upper mold 410 and the lower mold 420 and the hole surfaces of the through holes 432. Here, the mold 400 according to the second embodiment is characterized by a positioning engagement portion 460 provided on the side surface of the body mold 430.

  As shown in FIG. 9, a positioning engagement portion 460 including V-shaped convex portions or concave portions that engage with each other is provided on the side surface of the body mold 430. The positioning engagement portions 460 are provided on the upper and lower sides of the side surface of the trunk mold 430 so as not to interfere with the groove portions 436. The positioning engagement portion 460 performs positioning between the adjacent trunk molds 430 in a plurality of trunk molds 430 arranged concentrically and closely to each other, and restricts the positional deviation that occurs between the trunk molds 430. The positioning engagement portion 460 may be provided on a specific side surface instead of being provided on the six side surfaces of the trunk mold 430. Further, the positioning engagement portion 460 may be provided in another shape instead of being provided as a V-shaped uneven portion.

  As described above, according to the molding die 400 according to the second embodiment, the positional deviation that occurs between the adjacent barrel dies 430 is regulated by the positioning engagement portion 460, so Misalignment of the groove 438 facing each other is less likely to occur between adjacent barrel molds 430.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

It is a schematic diagram which shows the shaping | molding die concerning the 1st Embodiment of this invention. It is a perspective view which shows the shaping | molding die shown in FIG. It is a disassembled perspective view which shows the principal part of the shaping | molding die shown in FIG. It is explanatory drawing which shows the structure of the trunk | drum which comprises the shaping | molding die shown in FIG. It is explanatory drawing which shows the communicating path comprised by the some trunk | drum type | mold which has the structure shown in FIG. It is explanatory drawing which shows the structure of the communicating path in the shaping | molding die of a structure different from the structure shown in FIG. It is explanatory drawing which shows the structure of the communicating path in the shaping | molding die of a structure different from the structure shown in FIG. It is explanatory drawing which shows the shaping | molding die concerning the modification of 1st Embodiment. It is a disassembled perspective view which shows the principal part of the shaping | molding die concerning the 2nd Embodiment of this invention. It is a schematic diagram which shows the press molding apparatus containing the shaping | molding die concerning a prior art. It is a perspective view which shows the shaping | molding die shown in FIG.

Explanation of symbols

100, 200, 200 ′, 300, 400 Mold 110, 210, 310, 410 Upper mold 120, 220, 320, 420 Lower mold 130, 230, 230 ′, 330, 430 Body mold 132, 232, 332, 432 Through Hole 136, 236, 336, 436 Hole 138, 238, 338, 438 Groove 140 Holding base 150, 250, 350, 450 Molding space 460 Positioning engagement part

Claims (7)

Multiple sets of upper and lower molds,
A plurality of body molds having through holes inserted in a state in which the upper mold and the lower mold of each set are slidable and arranged in close contact with each other;
The plurality of cylinder molds arranged in close contact with each other in molding spaces formed in the through holes of the cylinder molds by the upper mold and the lower mold of each set inserted into the through holes of the cylinder molds. A communication path provided in each of the body molds so as to communicate with the outside;
A mold for optical elements. The communication path includes a hole portion that communicates the molding space with a side surface of each barrel mold, and a groove portion that communicates with the hole portion and is provided on a side surface of each barrel mold.
2. The optical element molding die according to claim 1, wherein the barrel-shaped groove portion is provided so as to communicate with the other barrel-shaped groove portions arranged in close contact with each other.   Each said cylinder type is a shaping | molding die for optical elements of Claim 1 or 2 which has a regular polygonal column shape.   4. The optical element molding die according to claim 1, wherein the plurality of barrel molds have the same shape. 5. Each of the barrel molds has a positioning engagement portion provided on a side surface,
The molding for optical elements according to any one of claims 1 to 4, wherein the positioning engagement portion of the barrel mold is provided so as to engage with a positioning engagement portion of another barrel mold disposed in close contact with each other. Type.   The optical element molding die according to claim 1, wherein the plurality of barrel molds are arranged concentrically and closely to each other.   The optical element molding die according to any one of claims 1 to 6, further comprising a holding portion that holds the contour shapes of the plurality of barrel molds arranged in close contact with each other.

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