JP2008056540A - Forming mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress breakage of a forming mold when it is heated. <P>SOLUTION: In the forming mold 1 equipped with a transfer member 2 having a transfer surface 2a for transferring a surface shape to an object to be formed and at least a base material 3 for supporting the transfer member 2, the transfer member 2 and the base material 3 are joined directly or through an intermediate layer member 4 located in the middle of the transfer member 2 and the base material 3. At least one surface of the joining surface 2b of the transfer member 2, the joining surface 3a of the base material 3, the joining surface 4b, joined with the transfer member 2 of the intermediate layer member 4, and the joining surface 4c, joined with the base material 3 of the intermediate layer member 4 is constituted to have non-joining parts 4d, 4e that are not directly joined. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold having a transfer member having a transfer surface and a substrate.

  Conventionally, when molding optical elements such as lenses, prisms, mirrors, or other objects to be molded, for example, using a pair of upper and lower molds, an optical element material or the like is placed between the molds to be molded. The object is being molded.

As the mold, there is known a mold in which a transfer member made of glass or the like and a base material made of a metal material or the like having a transfer surface for transferring a surface shape to a molding is joined. When manufacturing (molding) this mold, after the transfer member is heated to the molding temperature, a technique is employed in which the transfer member and the substrate are joined by pressurizing the substrate (for example, Patent Document 1).
JP 2002-348130 A

  By the way, since the linear expansion coefficient of the transfer member and the linear expansion coefficient of the base material are usually different from each other, the molding die described in Patent Document 1 is mainly heated by heating during molding of the optical element, manufacturing of the molding die itself, and the like. As a result, thermal stress was generated in the transfer member, and it was easy for cracks to enter from the joint surface of the transfer member with the base material.

  When cracks are formed in the transfer member or the like in this way, the cracks are gradually expanded, and eventually the transfer member or the like is cracked. Furthermore, the joining between the transfer member and the base material is peeled off due to cracking of the transfer member or the like.

  The subject of this invention is providing the shaping | molding die which suppresses the crack of the shaping | molding die at the time of a heating in view of the said conventional situation.

  In order to solve the above-mentioned problems, the molding die of the present invention is a molding die comprising a transfer member having a transfer surface for transferring a surface shape to a molding and at least a base material supporting the transfer member. The member and the base material are joined directly or via an intermediate layer member located between them, and the joining surface of the transfer member, the joining surface of the base material, and the joining of the intermediate layer member to the transfer member At least one of the surface and the bonding surface of the intermediate layer member with the base material has a non-bonded portion that is a portion that is not directly bonded.

  Further, the transfer member and the base material are joined via the intermediate layer member, and the intermediate layer member has a plurality of one ends joined to the transfer member and the other end joined to the base material. It is good to have a structure which has a columnar member and the said non-joining part is a gap | interval between the said columnar members.

  Further, the transfer member and the base material are joined via the intermediate layer member, and the intermediate layer member has one end joined to the transfer member and the other end joined to the base material 1 or It is good to have a structure which has a 2 or more cylindrical member and the said non-joining part is the gap | interval formed inside the said cylindrical member.

  Further, at least one of the bonding surface of the transfer member, the bonding surface of the base material, the bonding surface of the intermediate layer member with the transfer member, and the bonding surface of the intermediate layer member with the base material Is formed on the concavo-convex surface, and the non-joining portion is preferably a concave portion of the concavo-convex surface.

  In the present invention, a non-joining portion is provided on any joint surface between the transfer member and the substrate. Therefore, it is possible to weaken the thermal stress generated during heating due to the difference between the linear expansion coefficient of the transfer member and the linear expansion coefficient of the material, and to prevent cracks mainly generated in the transfer member and peeling of the joint. Therefore, according to this invention, the crack of the shaping | molding die at the time of a heating can be suppressed.

Hereinafter, a mold according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a mold according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an intermediate layer member of the mold.

  In FIG. 1, a mold 1 is a base material that supports a transfer member 2 having a transfer surface 2a for transferring a surface shape to a workpiece (not shown), and at least a transfer member 2 (in this embodiment, an intermediate layer member 4). 3, and an intermediate layer member 4 positioned between the transfer member 2 and the substrate 3.

  In this embodiment, the transfer member 2 is made of glass made of S-BSL7 (made by OHARA: yield point temperature 625 ° C.), and the intermediate layer member 4 is made of glass made of S-NSL5 (made by OHARA: yield point temperature 596 ° C.). An example of using will be described. The material including the transfer member 2 and the intermediate layer member 4 is not limited, but it is desirable to use a metal member such as super steel or stainless steel as the base material 3 from the viewpoint of strength.

  As shown in FIG. 2, the intermediate layer member 4 includes a cylindrical member 4 a as a plurality of columnar members. And the intermediate | middle layer member 4 is joined to the joining surface 2b of the transfer member 2 in the joining surface 4b of the upper surface which is one end of each cylindrical member 4a. Moreover, the intermediate | middle layer member 4 is joined to the joint surface 3a of a base material in the joint surface 4c of the lower surface which is the other end of each cylindrical member 4a.

  Here, the joining surface of the intermediate layer member 4 to the transfer member 2 and the base material 3 includes the joining surfaces 4b and 4c of the cylindrical member 4a to the transfer member 2 and the base material 3, and between the cylindrical members 4a. It is assumed that non-joining portions 4d and 4e made of a gap are included.

  The number of cylindrical members 4a, the spacing between the cylindrical members 4a, the area ratio of the joining surfaces 4b and 4c (or non-joined portions) of the cylindrical members 4a in the joining surface of the intermediate layer member 4 and the like are as follows. What is necessary is just to determine suitably from the property of a molded object, the material of the intermediate | middle layer member 4, etc. FIG. In the present embodiment, the columnar member 4a is used as the columnar member, but a prismatic member may be used.

FIG. 3 is an explanatory diagram for explaining a method of manufacturing the mold.
First, as shown in the figure, the body mold 5 is disposed on the outer peripheral surface of the substrate 3, and the heating member 6 in which the annular heaters 6 a and 6 b are embedded is disposed on the outer peripheral surface of the body mold 5. To do. Then, the cylindrical member 4 a constituting the intermediate layer 4 is placed on the base material 3.

  In addition, it is good to form the hole fitted to the cylindrical member 4a on the base material 3. FIG. By doing in this way, the stability of mounting the cylindrical member 4a on the base material 3 and the fusion property between the cylindrical member 4a and the base material 3 are increased.

  Next, the pressure die 7 slidable in the body die 5 is lowered by a pressure means (not shown) and brought into contact with the transfer surface 2a of the transfer member 2 as shown in FIG. In this state, the transfer member 2 and the intermediate layer member 4 are heated by the heating member 6 (heaters 6a and 6b) through the body mold 5.

  Then, after the transfer member 2 exceeds the bending point temperature (625 ° C.), pressurization is started by the pressurization die 7. When the intermediate layer member 4 is softened at the molding temperature of the transfer member 2, the cylindrical members 4 a constituting the intermediate layer member 4 are easily fused to each other. Therefore, the intermediate layer member 4 is softened at the molding temperature of the transfer member 2. It is desirable to use materials that do not.

  After the joining of the transfer member 2 and the intermediate layer member 4, the joining of the base material 3 and the intermediate layer member 4, the pressurization to the transfer member 2 (molding die 1), etc., the heating member 6 (heater 6 a, Stop heating according to 6b) and start cooling. In this embodiment, the transfer member 2 and the like are cooled by natural cooling. However, the cooling time can be shortened by using a cooling medium such as cold air or oil.

  As described above, the mold 1 shown in FIG. 1 is manufactured (molded). In addition, since the intermediate | middle layer member 4 was comprised by the cylindrical member 4a, each cylindrical member 4a is bent by the gap | interval between the cylindrical members 4a, and a stress is disperse | distributed. As a result, the transfer surface 2a of the transfer member 2 formed by the pressing die 7 may be different from the desired shape, but the pressing die 7 may be corrected in anticipation of deformation. The deformation of the transfer surface 2a may be corrected by measuring the molding die 1 by actual molding, but it is also possible to correct the shape by predicting in advance by simulation.

  In addition, in the drawing, the transfer surface 2a of the transfer member 2 formed by being pressed by the pressing die 7 is illustrated as if it is a plane, but the surface shape of the transfer surface 2a is concave, convex, Other surface shapes such as a Fresnel surface and an array surface are not a problem.

  In the first embodiment described above, the non-joined portions 4d and 4e formed by the gaps between the cylindrical members 4a are provided on the joint surface between the intermediate layer member 4 and the transfer member 2 and the base material 3. For this reason, the thermal stress generated during heating due to the difference between the linear expansion coefficient of the transfer member 2 and the linear expansion coefficient of the base material 3 is weakened, and cracks generated mainly in the transfer member 2 and peeling of the joint are prevented. be able to. Therefore, according to this embodiment, the crack of the shaping | molding die 1 at the time of a heating can be suppressed.

  Moreover, in this embodiment, since the intermediate | middle layer member 4 was comprised with the some cylindrical member 4a, since each cylindrical member 4a has bending and disperse | distributes stress, it can weaken a thermal stress more effectively. Accordingly, it is possible to further suppress cracking of the mold 1 during heating.

FIG. 4 is a perspective view showing an intermediate layer member according to the second embodiment of the present invention.
Since this embodiment is different from the first embodiment only in the configuration of the intermediate layer member 14, a detailed description thereof will be omitted.

  In FIG. 4, the intermediate | middle layer member 14 is comprised from the two cylindrical members 14a and 14b as one or two or more cylindrical members. As described in the first embodiment, the intermediate layer member 14 is manufactured (molded) as shown in FIG. 1 by the barrel mold 5, the heating member 6, the pressurizing mold 7 and the like shown in FIG. The Here, the non-joining portion according to the present embodiment includes a gap S1 between the cylindrical member 14a located outside and the cylindrical member 14b located inside, and a gap S2 inside the cylindrical member 14b located inside.

  The number of cylindrical members 14a and 14b, the distance between the cylindrical members 14a and 14b, the area ratio of the joining surfaces (or gaps S1 and S2) of the cylindrical members 14a and 14b to the joining surface of the intermediate layer member 14, etc. What is necessary is just to determine suitably from the property of the to-be-molded object performed, the material of the intermediate | middle layer member 14, etc.

  According to this embodiment, the non-joint portion including the gap S1 between the outer cylindrical member 14a and the inner cylindrical member 14b and the inner gap S2 of the inner cylindrical member 14b is used to As in the first embodiment, it is possible to suppress cracking of the mold during heating.

  Further, since the intermediate layer member 14 is constituted by the cylindrical members 14a and 14b, it is possible to increase the bonding area of the cylindrical members 14a and 14b with the transfer member or the base material shown in FIG. 1 and increase the bonding strength. it can. Therefore, it is possible to more effectively suppress cracking of the mold during heating.

FIG. 5 is a perspective view showing an intermediate layer member according to the third embodiment of the present invention.
Similar to the second embodiment, the present embodiment is different from the first embodiment only in the configuration of the intermediate layer member 24, and a detailed description thereof will be omitted.

  In FIG. 5, the intermediate layer member 24 is formed with an uneven surface with a joint surface 24 a with the transfer member 2 shown in FIG. 1 and a joint surface 24 b with the base material 3 (not visible in the same figure). These concavo-convex surfaces can be formed by, for example, etching, grinding, or the like in consideration of desired bonding strength. Here, in the present embodiment, the concave portions of the uneven surfaces (joint surfaces 24 a and 24 b) are non-joined portions that are not joined to the transfer member 2 or the base material 3.

  In addition, about the space | interval (height) between unevenness | corrugations, the ratio of the area of the recessed part in the joining surface of the intermediate | middle layer member 24, etc., the transcription | transfer member 2 (or base material 3) shown in FIG. It may be appropriately determined within the range (that is, within a range in which a concave portion as a non-joining portion can be left) from the properties of the molded article to be molded, the material of the intermediate layer member 24, and the like.

  According to the present embodiment, since the concave portions of the joining surfaces 24a and 24b of the intermediate layer member 24 are non-joined portions, cracking of the mold during heating can be suppressed as in the first embodiment. .

Moreover, according to this embodiment, since the intermediate | middle layer member 24 was formed from one member, the structure of a shaping | molding die is simplified.
In addition, even if it does not make the joining surfaces 24a and 24b of the intermediate | middle layer member 24 uneven | corrugated surface, the crack of the shaping | molding die at the time of a heating can be suppressed by forming recessed parts, such as a groove | channel. The concave portion may be appropriately determined in consideration of the bonding strength. For example, when the transfer member 2 (molding optical element) shown in FIG. 1 is rotationally symmetric, it is concentric by means such as cutting. It is preferable to form a groove.

  Further, in this embodiment, the concave and convex surfaces are formed on the joint surfaces 24a and 24b on both sides of the intermediate layer member 24. However, the intermediate layer member 24 is made of a glass material or the like close to the linear expansion coefficient of the transfer member 2 shown in FIG. In the case of being configured, the thermal stress generated between the intermediate layer member 24 and the transfer member 2 is relieved, and therefore a recess for relieving the stress may be provided only on the joint surface 24b with the base material 3. .

  In the first to third embodiments described above, the example in which the non-joining portion is provided on the intermediate layer members 4, 14, and 24 has been described. However, the transfer member 2 or the base shown in FIG. The effect of the present invention can also be obtained by providing non-joined portions such as the above-described recesses on the joining surfaces 2b and 3a of the material 3.

  In addition, the third layer described above is connected to the joint surface of the intermediate layer member 4 formed of the columnar member 4a and the intermediate layer member 14 formed of the cylindrical members 14a and 14b described in the first embodiment and the second embodiment. By providing the concave portion described in the embodiment, it is possible to effectively suppress cracking of the mold 1.

It is sectional drawing which shows the shaping | molding die concerning 1st Embodiment of this invention. It is a perspective view which shows the intermediate | middle layer member of the said shaping | molding die. It is explanatory drawing for demonstrating the manufacturing method of the said shaping | molding die. It is a perspective view which shows the intermediate | middle layer member which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the intermediate | middle layer member which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Transfer member 2a Transfer surface 2b Join surface 3 Base material 3a Join surface 4 Intermediate layer member 4a Cylindrical member 4b Join surface with transfer member 4c Join surface with substrate 4d, 4e Non-joint part (gap)
5 Body type 6 Heating member 6a, 6b Heater 7 Pressure type 14 Intermediate layer member 14a, 14b Cylindrical member 24 Intermediate layer member 24a, 24b Joint surface (uneven surface)

Claims (4)

In a molding die comprising a transfer member having a transfer surface for transferring a surface shape to a molding, and at least a base material for supporting the transfer member,
The transfer member and the base material are joined directly or via an intermediate layer member located between them,
At least one of the bonding surface of the transfer member, the bonding surface of the base material, the bonding surface of the intermediate layer member with the transfer member, and the bonding surface of the intermediate layer member with the base material, A molding die having a non-joining portion that is a portion that is not directly joined. The transfer member and the base material are joined via the intermediate layer member,
The intermediate layer member has a plurality of columnar members having one end bonded to the transfer member and the other end bonded to the substrate.
The mold according to claim 1, wherein the non-joining portion is a gap between the columnar members. The transfer member and the base material are joined via the intermediate layer member,
The intermediate layer member has one or more cylindrical members having one end bonded to the transfer member and the other end bonded to the substrate.
The mold according to claim 1, wherein the non-joining portion is a gap formed inside the cylindrical member. At least one of the bonding surface of the transfer member, the bonding surface of the base material, the bonding surface of the intermediate layer member with the transfer member, and the bonding surface of the intermediate layer member with the base material, Formed on the uneven surface,
The mold according to any one of claims 1 to 3, wherein the non-joining portion is a concave portion of the concavo-convex surface.