JP2010018464A - Molding die for optical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die for an optical element where the deviation and inclination of the axes of a plurality of upper and lower dies can be adjusted without preparing a driving mechanism. <P>SOLUTION: The molding die for the optical element includes plural sets of the upper dies 110 and the lower dies 120, a common barrel die 130 having a plurality of through-holes 134 intercalated with the upper die and the lower die in each set at a slidable state and a mold-pressing member 140 which is placed at the inside of the common barrel die so as to be surrounded with a plurality of the through-holes and which presses the plural sets of the upper dies and the lower dies in an outer direction of the common barrel die by thermal expansion for pressing to the surfaces of a plurality of the through-holes. As the plural sets of the upper and lower dies are pressed in the outer direction of the common barrel die by the thermally expanded mold-pressing member and pressed to the surfaces of a plurality of the through-holes, the deviation and inclination of the axes of a plurality of the upper and lower dies can be adjusted without preparing the driving mechanism. <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 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 a molding die having a highly accurate molding surface. Then, the molding material is heated to a temperature near the yield point of the glass through a molding die, and then pressed, and the shape of the molding surface is transferred to the molding material to mold the optical element.

  The mold consists of one or more sets of upper and lower molds, and a barrel mold through which the upper and lower molds are inserted. Slide in the body mold in the state. Therefore, in order to regulate the axial deviation and inclination of the upper and lower molds, the processing accuracy of the mold is required, and it is required to incorporate the upper and lower molds with a very high accuracy into the barrel mold. However, considering the processing accuracy of the molding die and the slidability of the upper die / lower die with respect to the barrel die, there is a limit to the improvement of the assembling accuracy.

  For this reason, the following Patent Document 1 describes a press molding apparatus having an adjustment mechanism that adjusts the axis deviation and inclination of the upper and lower molds by pressing the upper and lower molds in a direction perpendicular to the axis of the mold during pressing. Has been. This press molding apparatus is a batch type molding apparatus that batch-processes a series of molding processes including heating, pressing, and cooling, and includes a drive mechanism that drives an adjustment mechanism.

Japanese Patent Laid-Open No. 11-157854

  However, the molding apparatus described in Patent Document 1 is suitable for a case where a plurality of sets of upper molds and lower molds are incorporated into one body mold, and multi-cavity press molding is performed to simultaneously mold a large number of optical elements. Absent. Further, since the upper and lower molds are pressurized so as to be sandwiched from the direction perpendicular to the axis of the mold, that is, from the outside of the upper and lower molds, the molding apparatus itself becomes large. Also, in a continuous (mold transfer system) molding machine that moves a molding die between a plurality of molding processing chambers including a heating chamber, a press chamber, and a cooling chamber, the upper and lower molds are misaligned. In addition, it is difficult to provide an adjustment mechanism that adjusts the tilt, and further to provide a drive mechanism that drives the adjustment mechanism.

  The present invention has been made in view of the above problems, and its object is to provide a new and improved optical element molding die capable of adjusting the axial deviation and inclination of a plurality of upper and lower molds without providing a driving mechanism. It is to provide.

  In order to solve the above problems, according to the first aspect of the present invention, a plurality of sets of upper molds and lower molds and a plurality of penetrations inserted in a state in which each set of upper molds and lower molds is slidable. It is arranged inside the common cylinder mold so as to be surrounded by a plurality of through holes, and a plurality of sets of upper mold and lower mold are pressed toward the outside of the common cylinder mold by thermal expansion. There is provided a molding die for an optical element provided with a pressing member that presses against the hole surfaces of a plurality of through holes.

  According to such a configuration, a plurality of sets of upper and lower molds are pressed toward the outside of the common body mold by the thermally expanded stamping members and pressed against the hole surface of the through hole. The vertical misalignment and inclination of the upper and lower molds can be adjusted.

  In the common body mold, a plurality of through holes may be arranged on the same circumference. As a result, in a mold having a plurality of upper and lower molds arranged on the same circumference, press molding can be performed by taking a large number of pieces in a state where the axial deviation and inclination of the plurality of upper and lower molds are adjusted.

  Further, a plurality of common cylinder molds are concentrically arranged, and an embossing member may be arranged between each of the inside of the innermost common cylinder mold and the plurality of common cylinder molds arranged concentrically. Good. As a result, in a molding die having a plurality of upper and lower molds arranged concentrically, press molding by multi-cavity can be performed in a state where the axial deviation and inclination of the plurality of upper and lower molds are adjusted.

  In addition, the mold pressing member includes a first mold pressing member that presses the upper mold of the plurality of sets of upper molds and lower molds toward the outer side of the common barrel mold and presses them against the hole surfaces of the plurality of through holes, and a plurality of mold pressing members. You may make it consist of the 2nd embossing member which presses the lower mold | die of the group upper mold | type and lower mold | die to the outer side of a common cylinder mold | die, and presses it to the hole surface of a some through-hole. As a result, since the embossing members are configured as the first and second embossing members, it becomes easy to adjust the outer shape and change the material for the embossing members corresponding to the upper and lower molds. The mold and the lower mold can be pressed against the hole surface of the through hole with different clearances.

  Moreover, the peripheral surface of the said pressing member may be provided with the recessed part or convex part which presses several sets of upper mold | types and lower mold | types to the outer side of a common trunk | drum type | mold by thermal expansion. Thereby, since sufficient contact is ensured between the upper and lower molds and the pressing member by the concave portion or the convex portion provided on the peripheral surface of the pressing member, the pressing direction of the upper and lower molds can be accurately regulated. .

  Moreover, the V-shaped recessed part on the cross section orthogonal to the center axis | shaft of a common trunk | drum type | mold may be provided in the hole surface of the several through-hole to which the said several group upper die and lower die are pressed. As a result, the upper and lower molds are pressed against the V-shaped concave portion provided on the hole surface of the through hole, so that the positioning of the upper and lower molds with respect to the hole surface of the through hole can be accurately regulated.

  Further, the innermost stamping member is formed in an annular shape on a cross section perpendicular to the central axis of the common body mold, and is divided corresponding to a plurality of through holes arranged to surround the stamping member. May be. As a result, in accordance with the assembling error occurring in the upper and lower molds of each set, the relative movement amount of the common barrel mold in the outer direction is adjusted between the divided stamping members, and The mold can be pressed against the hole surface of the through hole.

  ADVANTAGE OF THE INVENTION According to this invention, the optical element shaping | molding die which can adjust the axial deviation and inclination of a some vertical mold | type without providing a drive mechanism 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.

  FIG. 1 is a schematic diagram showing a press molding apparatus including a molding die 100 according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the mold 100 shown in FIG.

  As shown in FIG. 1, the press molding apparatus includes a molding die 100, 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 drive device 22, a load detection 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 100, and an upper plate 10 supported by the upper shaft 18 is disposed above the molding die 100. Around the mold 100, a heating lamp 14 is arranged. Around the mold 100, the upper plate 10, the lower plate 12, and the heating lamp 14, the mold 100, 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 100, the detected load of the load detecting device 24, and the like. Control devices. The molding die 100 placed on the lower plate 12 is pressed against the upper plate 10 as the lower plate 12 moves up, and presses the molding material 1 placed in the molding space 160.

  As shown in FIGS. 1 and 2, the mold 100 includes a plurality of sets of an upper mold 110 and a lower mold 120, a common body mold 130, a stamping member 140, and a holding table 150. The upper mold 110 and the lower mold 120 include cylindrical main body portions 112 and 122 and flange portions 114 and 124 provided at one end of the main body portions 112 and 122, and a molding surface 116 is formed at the other end of the main body portions 112 and 122. 126 are provided. The common body mold 130 has a cylindrical outer shape, and a columnar storage space 132 (corresponding to a space in which the embossing member 140 is stored in FIG. 2) provided at the center, and the same circumference. A plurality of through-holes 134 provided at the same interval on the top, and a vent hole 136 provided from the hole surface of the through-hole 134 toward the outer peripheral surface of the common trunk mold 130 are provided. The embossing member 140 is made of a material having a higher linear expansion coefficient than the common body mold 130, has a substantially cylindrical outer shape, and is disposed in the storage space 132 of the common body mold 130. The holding table 150 supports the lower mold 120 and transmits a pressing force during molding to the lower mold 120.

Examples of the material forming the common body mold 130 include tungsten carbide, cemented carbide such as magnesium alloy, glassy carbon, silicon carbide (SiC), stainless steel (SUS), and the like. Examples of the linear expansion coefficient of these materials are: glassy carbon 3.4 × 10 ⁻⁶ / ° C., silicon carbide 4.1 × 10 ⁻⁶ / ° C., cemented carbide 4.7 to 4.9 × 10 ⁻⁶ / ° C., stainless steel 9 9 × 10 ⁻⁶ / ° C. Therefore, for example, when the common body mold 130 is formed of glassy carbon, the embossing member 140 is formed of silicon carbide, so that the embossing member 140 is made of a material having a higher linear expansion coefficient than the common body mold 130. Can be formed.

  When the mold 100 is assembled, the plurality of lower molds 120 are assembled with respect to the holding table 150. The common body mold 130 has a lower surface in contact with the upper surface of the flange portion 124 of the lower mold 120, and the through hole 134 is in sliding contact with the peripheral surface of the main body portion 122 of the lower mold 120. 120 is assembled. In the state where the embossing member 140 is stored in the storage space 132, the lower surface is in contact with the upper surface of the flange portion 124 of the lower mold 120, and the peripheral surface is the peripheral surface of the main body 122 of the lower mold 120 and the common body mold 130. The holder 150 and the lower mold 120 are assembled so as to be in sliding contact with the inner peripheral surface. The plurality of upper molds 110 are arranged with respect to the common body mold 130 and the pressing member 140 such that the peripheral surface of the main body 112 is in sliding contact with the hole surface of the through hole 134 of the common body mold 130 and the peripheral surface of the pressing member 140. Assembled. Then, the common body mold 130 and the stamping member 140 are arranged so that heat transfer is performed to the lower surfaces of the common barrel mold 130 and the stamping member 140 so that they are in contact with the upper surface of the flange portion 124 of the lower mold 120. 150 is arranged in the vicinity.

  A predetermined expansion gap G, which will be described later, is formed between the common body mold 130 and the stamping member 140 before the heating process. The upper mold 110 is arranged with respect to the common body mold 130 and the pressing member 140 such that the peripheral surface of the main body 112 is in sliding contact with the hole surface of the through hole 134 and the peripheral surface of the pressing member 140. Molding for molding an optical element in the common barrel mold 130 by the molding surface 116 of the upper mold 110, the molding surface 126 of the lower mold 120, and the hole surface of the through hole 134 in the assembled state of the molding die 100. A space 160 is formed. Each molding space 160 in the common body mold 130 communicates with the outside of the common body mold 130 through the air holes 136.

  In the press molding apparatus, 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 arranged on the molding surface 126 of the plurality of lower molds 120 in a state where the holding table 150, the plurality of lower molds 120, the common body mold 130, and the stamping member 140 are assembled. A plurality of upper molds 110 are assembled. Here, the upper mold 110 is formed with respect to the common cylinder mold 130 and the pressing member 140 in a state where the molding surface 116 is in contact with the molding material 1 and the lower surface of the flange portion 114 is not in contact with the upper surface of the common cylinder mold 130. Arranged. In the purge process, the air in the molding chamber 28 is replaced with an inert gas, and the air in the molding space 160 is also replaced with an inert gas through the vent hole 136.

  In the heating step, the molding material 1 is heated to a temperature near the yield point of the glass through the molding die 100 by the heating lamp 14 arranged 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. Here, in the upper mold 110, the press amount of the lower mold 120 is restricted by the lower surface of the flange portion 114 being in contact with the upper surface of the common body mold 130. In addition, the gas sealed in the molding space 160 is discharged to the outside of the common body mold 130 through the vent hole 136. The vent hole 136 is formed of fine holes so that the heat-softened molding material 1 is not discharged. In the cooling process, 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 through the molding die 100. In the post-processing step, the plurality of upper molds 110 or the common body mold 130 (optionally together with the pressing member 140) are removed from the mold 100, and the plurality of optical elements are taken out from the plurality of lower molds 120. .

  3 and 4 are explanatory diagrams for explaining the operation of the mold 100 shown in FIG. FIG. 3 shows a state before the heating step (A) and a state after the heating step (B) for a set of the upper die 110 and the lower die 120 constituting the molding die 100 shown in FIG. . 4 shows a cross section (corresponding to the AA cross section shown in FIG. 3) of a plurality of sets of upper molds 110 constituting the mold 100 shown in FIG. A state (A) before the process and a state (B) after the heating process are shown. In the drawings shown below, for convenience of explanation, the gap E and the expansion gap G corresponding to the assembly error of the upper and lower molds 110 and 120 with respect to the common body mold 130 are exaggerated.

  As shown in FIG. 3A, there is an assembly error between the upper and lower molds 110 and 120 and the common trunk mold 130 due to the axial displacement and inclination of the upper and lower molds 110 and 120. Has occurred. In the following, for the convenience of explanation, in all sets of upper and lower molds 110 and 120, the upper mold 110 is assembled inside the common barrel mold 130 from the original assembly position, so that the assembly error due to the axial misalignment of the upper and lower molds 110 and 120. A case where the above has occurred will be described. However, the operation of the mold 100 can be described in the same manner even when an assembly error occurs due to the axial deviation and inclination of the upper and lower molds 110 and 120 in other assembled states.

  As shown in FIG. 4A, in the mold 100 before the heating step, a predetermined expansion gap G is formed between the common body mold 130 and the mold pressing member 140. In all sets of upper and lower molds 110 and 120, the upper mold 110 is in contact with the pressing member 140 inside the common body mold 130, and a gap corresponding to an assembling error between the outer peripheral side and the hole surface of the through hole 134. E is generated. Although not shown in FIG. 4 (A), the lower mold 120 causes a gap E between the inner surface of the common body mold 130 and the stamping member 140, and the hole surface of the through hole 134 on the outer peripheral side. Is in contact with Here, for convenience of explanation, it is assumed that all sets of upper and lower molds 110 and 120 are assembled in the same assembled state, but each set of upper and lower molds 110 and 120 are assembled in different assembled states. It may be.

  As shown in FIG. 3B, in the heating process, the molding material 1 is heated and softened through the heated mold 100. Further, in the heating process, the stamping member 140 is heated through the molding die 100, and the stamping member 140 expands to the outside of the common barrel mold 130 with a predetermined expansion amount, so that the upper and lower molds 110, 120 are in the common barrel mold. It is pressed toward the outer side of 130 and pressed against the hole surface of the through hole 134.

  As shown in FIG. 4 (B), in the mold 100 after the heating process, the upper mold 110 incorporated inside the common cylinder mold 130 is pressed toward the outside of the common cylinder mold 130 from the original assembly position. By being pressed against the hole surface of the through-hole 134, the axial misalignment of the upper and lower molds 110 and 120 that has occurred in the mold 100 before the heating process is eliminated. Here, a minimum clearance is secured between the peripheral surface of the main body 112 of the upper mold 110 and the hole surface of the through hole 134 for sliding of the upper mold 110. In the pressing step, the upper mold 110 is pressed against the lower mold 120 in a state where the assembly errors of the upper and lower molds 110 and 120 are eliminated, and the molding surfaces 116 and 126 of the upper and lower molds 110 and 120 are formed on the molding material 1. Transcribed.

  As described above, according to the mold 100 according to the first embodiment, the upper and lower molds 110, 120 arranged on the same circumference are moved outward of the common barrel mold 130 by the stamped member 140 that is thermally expanded. Since it is pressed and pressed against the hole surface of the through-hole 134, the axial deviation and inclination of the plurality of upper and lower molds 110, 120 can be adjusted without providing a drive mechanism.

  In the above embodiment, the case of using the substantially cylindrical pressing member 140 has been described. However, instead of the substantially cylindrical shape, for example, a pressing member having another shape such as a substantially regular polygonal column shape is used. You may arrange | position inside a common trunk | drum type | mold so that it may be enclosed by the some through-hole distribute | arranged corresponding to each side surface of a member. Also in this case, a plurality of sets of upper mold and lower mold are pressed toward the outer side of the common barrel mold by the thermal expansion of the stamping member having another shape, and are pressed against the hole surfaces of the plurality of through holes. The vertical axis offset and tilt can be adjusted.

  FIG. 5 is a perspective view showing a mold 200 according to the second embodiment of the present invention. Below, although the shaping | molding die 200 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. As shown in FIG. 5, the molding die 200 according to the second embodiment is similar to the molding die 100 according to the first embodiment in that a plurality of sets of upper die 210 and lower die 220, common trunk die 230, die The push member 240 and the holding base 250 are included. In the molding die 200, the common barrel die 230 has a substantially cylindrical outer shape, and annular first and second storage spaces 232, 233 (in FIG. 2), a plurality of through holes 234 provided at the same interval on the same circumference, and the surface of the common body mold 230 from the hole surfaces of the through holes 234. A vent hole 236 is provided toward the outer peripheral surface. The embossing member is made of a material having a higher linear expansion coefficient than that of the common body die 230, and includes first and second embossing members 240 and 245 having a cylindrical outer shape.

  As for the assembly of the mold 200, the first pressing member 240 is stored in the first storage space 232 and the second storing space 233 is stored in the second storage space 233 instead of storing the pressing member 140 in the storage space 132. This is the same as the case of the mold 100 according to the first embodiment except that the mold pressing member 245 is stored.

  The common body mold 230 and the stamping member 240 are arranged so that heat transfer is performed to the lower surfaces of the common body mold 230 and the stamping member 240 so that they are in contact with the upper surface of the flange portion 224 of the lower mold 220. 250 is arranged in the vicinity of 250. The upper mold 210 is in contact with the common body mold 230 and the second pressing member 245 so that the peripheral surface of the main body 212 is in sliding contact with the hole surface of the through hole 234 and the outer peripheral surface of the second pressing member 245. Arranged.

  FIG. 6 is an explanatory diagram for explaining the operation of the mold 200 shown in FIG. FIG. 6 shows the state before the heating step (A) and the state after the heating step (B), as in FIG. Hereinafter, the operation of the mold 200 will be described with reference to FIG.

  As shown in FIG. 6 (A), there is an assembly error between the upper and lower molds 210 and 220 and the common trunk mold 230 due to misalignment and inclination of the upper and lower molds 210 and 220. Has occurred. In the molding die 200 before the heating step, predetermined expansion gaps G1 and G2 are formed between the common barrel die 230 and the first and second die pressing members 240 and 245, respectively. The expansion gaps G1 and G2 may be set as the same interval or may be set as different intervals. In all sets of upper and lower molds 210 and 220, the upper mold 210 is in contact with the second pressing member 245 on the inner side of the common body mold 230, and causes an assembling error between the outer peripheral side and the hole surface of the through hole 234. A corresponding gap E2 is generated. Further, the lower mold 220 generates a gap E1 between the first mold pressing member 240 inside the common body mold 230, and is in contact with the hole surface of the through hole 234 on the outer peripheral side.

  As shown in FIG. 6B, in the heating process, the first and second pressing members 240 and 245 are heated through the molding die 200, and the first and second pressing members 240 and 245 are the common barrel mold. The upper and lower molds 210 and 220 are separately pressed toward the outer side of the common barrel mold 230 and pressed against the hole surface of the through-hole 234 by being expanded to the outer side of the 230 by a predetermined expansion amount. Then, in the mold 200 after the heating process, the upper mold 210 that is incorporated inside the common cylinder mold 230 from the original assembly position is pressed toward the outside of the common cylinder mold 230 so as to reach the hole surface of the through hole 234. By being pressed against the upper and lower molds 210 and 220, the axial misalignment generated in the mold 200 before the heating process is eliminated.

  In the pressing step, the upper mold 210 is pressed against the lower mold 220 by sliding the upper mold 210 with respect to the through hole 234. For this reason, it is not necessary to secure a clearance for the sliding of the lower mold 220 between the peripheral surface of the main body 222 of the lower mold 220 and the hole surface of the through hole 234, but the main body 212 of the upper mold 210. It is necessary to secure a minimum clearance between the peripheral surface of the upper mold 210 and the hole surface of the through hole 234 for sliding the upper mold 210. For this reason, it is desirable that the upper mold 210 and the lower mold 220 are pressed against the hole surface of the through-hole 234 with different clearances. However, in the stamping member made of the same member, the adjustment of the outer diameter, the material It becomes difficult to make changes. However, by configuring the embossing member with the first and second embossing members 240 and 245, it is easy to adjust the outer diameter and change the material, so that the upper mold 210 and the lower mold 220 have different clearances from each other. It can be pressed against the hole surface of the through hole 234.

  7-10 is explanatory drawing explaining operation | movement of the shaping | molding die 300,400,500,600 which concerns on the 3rd-6th embodiment of this invention. 7 to 10, cross sections (corresponding to the AA cross section shown in FIG. 3) of a plurality of sets of upper molds 310, 410, 510, and 610 constituting the molds 300, 400, 500, and 600. The state before the heating step (A) and the state after the heating step (B) are shown.

  The molds 300, 400, 500, and 600 according to the third to sixth embodiments are the first implementations except for the common body molds 330, 430, 530, and 630 and the stamping members 340, 440, 540, and 640. It has the same configuration as the mold 100 according to the embodiment. Below, although the shaping | molding die 300, 400, 500, 600 which concerns on 3rd-6th embodiment is demonstrated, the description which overlaps with the shaping | molding die 100 which concerns on 1st Embodiment is abbreviate | omitted.

  In the mold 300 according to the third embodiment, as compared to the mold 100 according to the first embodiment, a plurality of through holes 334 are arranged inside the common barrel mold 330 with respect to the storage space 332. . Further, in order to ensure sufficient contact with the peripheral surfaces of the main body portions 312 and 322 of the upper and lower molds 310 and 320 on the peripheral surface of the embossing member 340, curved concave portions 342 are provided at the same interval. It has been. The embossing member 340 may be provided with a V-shaped recess instead of the curved recess 342. Thereby, as compared with the mold 100 according to the first embodiment, the pressing direction of the upper and lower molds 310 and 320 when the mold pressing member 340 is expanded can be accurately regulated. Further, since the rotation of the stamping member 340 with respect to the common barrel mold 330 is restricted, the stamping member 340 can be assembled in the same direction with respect to the common barrel mold 330.

  In the mold 400 according to the fourth embodiment, as compared to the mold 100 according to the first embodiment, a plurality of through holes 434 are arranged on the outer peripheral side of the common barrel mold 430 with respect to the storage space 432. Yes. Further, in order to ensure sufficient contact between the peripheral surface of the embossing member 440 and the peripheral surfaces of the main body portions 412 and 422 of the upper and lower molds 410 and 420, curved convex portions 442 are provided at the same interval. Is provided. Thereby, compared with the shaping | molding die 100 which concerns on 1st Embodiment, the pressing direction of the upper-and-lower molds 410 and 420 at the time of expansion | swelling of the pressing member 440 can be controlled correctly.

  In the mold 500 according to the fifth embodiment, in order to ensure the positioning of the upper and lower molds 510 and 520 with respect to the hole surface of the through hole 534, the hole surface of the through hole 534 corresponding to the outer peripheral surface side of the common body mold 530 is provided. Is provided with a V-shaped recess 538. As a result, the upper and lower molds 510 and 520 are pressed against the V-shaped recess 538 provided on the hole surface of the through hole 534, so that the through hole is smaller than the mold 100 according to the first embodiment. Positioning of the upper and lower molds 510 and 520 with respect to the hole surface of 534 can be accurately regulated.

  In the mold 600 according to the sixth embodiment, the pressing member 640 has a cylindrical outer shape and is divided so as to correspond to a plurality of sets of upper and lower molds 610 and 620. In the divided stamping member 640 (divided member), when the divided members slide with each other, the amount of relative movement of the common body mold 630 in the outer direction is adjusted with the other divided members. As a result, even when a plurality of sets of upper and lower molds 610 and 620 are assembled in different assembled states, depending on the assembling error occurring in each set of upper and lower molds 610 and 620, the divided members are moved outward. Each pair of upper and lower molds 610 and 620 can be pressed against the hole surface of the through hole 634 in a state where the relative movement amount is adjusted.

  FIG. 11 is a perspective view showing a mold 700 according to the seventh embodiment of the present invention. Below, although the shaping | molding die 700 which concerns on 7th Embodiment is demonstrated, the description which overlaps with the shaping | molding die 100 which concerns on 1st Embodiment is abbreviate | omitted.

  As shown in FIG. 11, a molding die 700 according to the seventh embodiment includes a plurality of sets of an upper die 710 and a lower die 720, first and second common barrel dies 730 and 735, and first and second die. The push members 740 and 745 and the holding base 750 are included. In the molding die 700, the first common barrel die 730 has a substantially columnar outer shape, and a columnar first storage space 732 (in FIG. 11, the first stamping member 740) provided at the center. , And a plurality of through holes 734 provided at the same interval on the same circumference. The first embossing member 740 has a cylindrical outer shape and is made of a material having a higher linear expansion coefficient than that of the first common trunk mold 730. The second common trunk mold 735 has a substantially cylindrical outer shape with a larger diameter than the first common trunk mold 730, and a columnar second storage space 733 (in FIG. 11, This corresponds to a space in which the second embossing member 745 is stored.), And a plurality of through holes 734 provided at the same interval on the same circumference. The second embossing member 745 has a cylindrical outer shape with a larger diameter than the first common cylinder mold 730 and is made of a material having a higher linear expansion coefficient than the second common cylinder mold 735. The first common cylinder mold 730, the second mold pressing member 745, and the second common cylinder mold 735 are disposed concentrically with respect to the first mold pressing member 740 disposed at the center of the mold 700. Is done.

  Regarding the assembly of the mold 700, the first and second common body molds 730 and 735 and the first and second mold pressing members 740 and 745 are assembled instead of the common body mold 130 and the stamping member 140. Except for this, it is the same as the case of the mold 100 according to the first embodiment.

  FIG. 12 is an explanatory diagram for explaining the operation of the mold 700 shown in FIG. FIG. 12 shows the state (A) before the heating step and the state (B) after the heating step, as in FIG. Hereinafter, the operation of the mold 700 will be described with reference to FIG. 12 described above.

  Assembling errors of the upper and lower molds 710 and 720 occur between the upper and lower molds 710 and 720 and the first and second common barrel molds 730 and 735 due to the axial displacement and inclination of the upper and lower molds 710 and 720. Yes. In addition, as shown in FIG. 12A, in the mold 700 before the heating step, the first common cylinder mold 730 and the first mold pressing member 740 and the second common cylinder mold 735 and the second mold Predetermined expansion gaps G <b> 1 and G <b> 2 are respectively formed between the two pressing members 745. The expansion gaps G1 and G2 may be set as the same interval or may be set as different intervals. In all the upper and lower molds 710 and 720, the upper mold 710 is in contact with the first and second embossing members 740 and 745 inside the first and second common barrel molds 730 and 735, respectively, On the side, gaps E1 and E2 corresponding to assembling errors are generated between the through hole 734 and the hole surface. In addition, the lower mold 720 generates gaps E1 and E2 between the first and second common body molds 730 and 735 and the first and second mold pressing members 740 and 745, respectively, so that the outer peripheral side Then, it is in contact with the hole surface of the through hole 734.

  In the heating process, the first and second stamping members 740 and 745 are heated through the molding die 700, and the first and second stamping members 740 and 745 are formed of the first and second common barrel molds 730 and 735. When the upper and lower molds 710 and 720 are respectively expanded in the outward direction by a predetermined expansion amount, the upper and lower molds 710 and 720 are pressed in the outward direction of the first and second common barrel molds 730 and 735, respectively. Pressed. As shown in FIG. 12 (B), in the mold 700 after the heating process, the upper mold 710 incorporated in each of the first and second common barrel molds 730 and 735 from the original assembly position is provided. The upper and lower molds 710 generated in the mold 700 before the heating step are pressed in the outer direction of the first and second common barrel molds 730 and 735 and pressed against the hole surface of the through hole 734. , 720 is eliminated. As a result, even in the molding die 700 having a plurality of upper and lower dies 710 and 720 arranged concentrically, press molding by multi-cavity is performed in a state where the axial deviation and inclination of the plurality of upper and lower dies 710 and 720 are adjusted. It can be carried out.

  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.

  For example, in the molds 300, 400, 500, and 600 according to the third to sixth embodiments, the mold pressing members 340, 440, 540, and 640 are used in the same manner as the mold 200 according to the second embodiment. The first and second members may be configured. Also in the mold 700 according to the seventh embodiment, the first and second common barrel molds 730, 735 are the same as the molds 300, 400, 500, 600 according to the third to sixth embodiments. The first and second stamping members 740 and 745 may be configured, and the first and second stamping members 740 and 745 may be the first and second stamping members 740 and 745 in the same manner as the mold 200 according to the second embodiment. You may comprise as a 2nd member.

It is a schematic diagram which shows the press molding apparatus containing 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 explanatory drawing explaining operation | movement of the shaping | molding die shown in FIG. It is explanatory drawing explaining operation | movement of the shaping | molding die shown in FIG. It is a perspective view which shows the shaping | molding die concerning the 2nd Embodiment of this invention. It is explanatory drawing explaining operation | movement of the shaping | molding die shown in FIG. It is explanatory drawing explaining operation | movement of the shaping | molding die which concerns on the 3rd Embodiment of this invention. It is explanatory drawing explaining operation | movement of the shaping | molding die concerning the 4th Embodiment of this invention. It is explanatory drawing explaining operation | movement of the shaping | molding die concerning the 5th Embodiment of this invention. It is explanatory drawing explaining operation | movement of the shaping | molding die which concerns on the 6th Embodiment of this invention. It is a perspective view which shows the shaping | molding die concerning the 7th Embodiment of this invention. It is explanatory drawing explaining operation | movement of the shaping | molding die shown in FIG.

Explanation of symbols

100, 200, 300, 400, 500, 600, 700 Mold 110, 210, 310, 410, 510, 610, 710 Upper mold 120, 220, 320, 420, 520, 620, 720 Lower mold 130, 230, 330 430, 530, 630, 730, 735 Common barrel type 134, 234, 334, 434, 534, 634, 734 Through hole 140, 240, 245, 340, 440, 540, 640, 740, 745 Embossing member

Claims (7)

Multiple sets of upper and lower molds,
A common barrel mold in which a plurality of through holes are inserted so that the upper mold and the lower mold of each set are slidable;
The plurality of through-holes are arranged inside the common cylinder mold so as to be surrounded by the plurality of through-holes, and press the plurality of upper molds and lower molds toward the outside of the common cylinder mold by thermal expansion. An embossing member pressed against the hole surface;
A mold for optical elements.   The optical element molding die according to claim 1, wherein the plurality of through holes are arranged on the same circumference in the common body mold. A plurality of common torso molds are arranged concentrically,
3. The optical element molding according to claim 1, wherein the embossing members are respectively arranged between an innermost common cylinder mold and a plurality of concentric common cylinder molds. Type.   The first pressing member that presses the upper mold of the plurality of sets of upper molds and lower molds toward the outer side of the common body mold to press against the hole surfaces of the plurality of through holes, and It consists of the 2nd embossing member which presses a lower type | mold to the outer side of the said common trunk | drum type | mold, and presses against the hole surface of these several through-holes among these sets of upper mold | type and lower mold | type. The mold for optical elements according to any one of the above.   The concave surface or the convex portion that presses the plurality of sets of upper and lower dies toward the outer side of the common body die by thermal expansion is provided on the peripheral surface of the embossing member. The mold for optical elements described.   The hole surface of the plurality of through holes to which the plurality of upper and lower molds are pressed is provided with a V-shaped recess on a cross section perpendicular to the central axis of the common body mold. 5. The mold for optical elements according to any one of 5 above.   The embossing member arranged on the innermost side is formed in an annular shape on a cross section perpendicular to the central axis of the common body mold, and is divided corresponding to a plurality of through holes arranged so as to surround the embossing member. The mold for optical elements according to any one of claims 1 to 6.

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