JPWO2011122252A1 - Molding apparatus and resin molded product manufacturing method - Google Patents

Abstract

Since the contact portion 91a of the convex member 81a and the contact portion 91a of the concave member 81b are covered with the protective layer 93, the shape of the convex member 81a and the concave member 81b is selected by selecting the material of the protective layer 93. Deterioration due to wear of the convex member 81a and the concave member 81b can be prevented while maintaining the desired strength. As a result, the alignment accuracy between the fixed mold 41 and the movable mold 42 can be increased and the alignment state can be maintained for a long period of time, so that the shape accuracy of the resin molded product can be maintained with a high degree of accuracy over a long period of time.

Description

  The present invention relates to a molding apparatus for injection molding and a method for producing a resin molded product such as an optical element using the molding apparatus.

  As a molding apparatus, a concave taper is provided on the fixed mold, and a convex taper is provided on the movable mold. For example, the mold is perpendicular to the mold clamping direction on the movable platen side that supports the movable mold. There is one provided with a friction mechanism that allows movement of the movable mold within the surface (see Patent Document 1). Here, the taper portion for alignment is preferably subjected to hardening treatment such as quenching and coating, and low friction treatment such as coating.

International Publication No. 2008/026431

  However, as a result of actually trying to mold using the molding die provided with the friction mechanism portion as described above, the present inventor has found that the fixed side mold and the movable side die are separated even if the friction mechanism portion is provided. It was confirmed that when the positional deviation was large, wear of the alignment taper portion became severe and stable molding could not be maintained. Here, it is conceivable to reduce the positional deviation between the fixed side mold and the movable side mold from the beginning, but such positional deviation adjustment is not always easy. In addition, even when the positional deviation between the fixed side mold and the movable side mold is reduced, the mold clamping operation shaft of the molding machine may be displaced due to changes in the environmental temperature during long-term continuous molding. Yes, the taper portion for alignment gradually wears, and the shape accuracy of the molded product gradually deteriorates. In addition, the present inventor has confirmed that the positioning accuracy of the tapered portion may be reduced even if the alignment tapered portion is coated with hardening or friction reduction. That is, if the coating is thickened to suppress friction at the taper portion and increase the strength, the film thickness distribution of the taper surface is increased and the component accuracy is impaired, resulting in a decrease in alignment accuracy, that is, molding accuracy.

  Therefore, the present invention uses a molding device that can reduce the wear of the taper portion due to repeated molding without reducing the alignment accuracy, and can maintain the shape accuracy of the resin molded product for a long period of time, and such a molding device. It aims at providing the manufacturing method of a resin molded product.

  In order to solve the above-mentioned problems, a molding apparatus according to the present invention includes a first mold, a second mold that forms a mold space by being clamped to the first mold, and a first mold. A pressing force for clamping at least one of the positioning part for positioning the first mold and the second mold and the first mold and the second mold when clamping the second mold. A displacement mechanism that displaces in a direction perpendicular to the opening and closing direction according to the positioning mold, wherein the positioning portion is a convex member fixed to one of the first mold and the second mold, A concave member fixed to the other of the first mold and the second mold, and the contact portion of the convex member and the contact portion of the concave member are covered with a protective layer to protect The layer has a higher hardness than the base material and a lower dynamic friction coefficient than the base material.

  In the molding apparatus, since the contact portion of the convex member and the contact portion of the concave member are covered with a protective layer having a hardness higher than that of the base material and a low coefficient of dynamic friction, the convex member and the concave member Deterioration due to wear of the convex member and the concave member can be prevented while maintaining the shape strength. Thereby, since the alignment precision of a 1st metal mold | die and a 2nd metal mold | die can be improved and an alignment state can be maintained for a long period of time, the shape precision of a resin molded product can be maintained with a high precision over a long period of time. When the displacement mechanism is provided, the burden on the protective layer at the time of closing the mold is reduced as compared with the case where the displacement mechanism is not provided. Therefore, durability can be ensured even if the film thickness is reduced.

  Moreover, in another viewpoint of this invention, the contact part of a convex member and the contact part of a concave member contact directly, without interposing a lubricant. In this case, it is possible to prevent the alignment accuracy from being deteriorated by the lubricant, and the alignment accuracy from fluctuating due to the elapsed time from the injection of the lubricant.

  In still another aspect of the present invention, the protective layer is a thin film having a dynamic friction coefficient of 0.4 or less and a strength of 2500 Hv or more.

  In still another aspect of the present invention, the thickness of the protective layer is 3 μm or less, preferably 0.05 μm or more and 1 μm or less. In this case, since the film thickness distribution of the protective layer can be reduced and the accuracy of the positioning portion is not impaired, the alignment accuracy between the first mold and the second die can be increased by the positioning portion.

  According to still another aspect of the present invention, the concentricity between the contact portion of the convex member and the contact portion of the concave member is 4 μm or less, and the contact portion of the convex member and the contact portion of the concave member Is 15 μm or less.

  In still another aspect of the present invention, the contact portion of the convex member and the contact portion of the concave member are tapered members. In this case, the axial misalignment between the convex member and the concave member can be corrected easily and reliably.

  The method for manufacturing a resin molded product according to the present invention positions the first mold and the second mold when the first mold and the second mold are clamped to form a mold space. A molding die having a positioning part and a displacement mechanism for displacing at least one of the first die and the second die in a direction perpendicular to the opening and closing direction according to the pressing force at the time of clamping is used. A method for manufacturing a resin molded product, wherein the positioning portion is a convex member fixed to one of the first mold and the second mold, and a concave shape fixed to the other of the first mold and the second mold. The contact portion of the convex member and the contact portion of the concave member are covered with a protective layer, and the protective layer is harder than the base material and has a dynamic friction than the base material. The coefficient is low.

  In the method for producing a resin molded article, the contact portion of the convex member and the contact portion of the concave member are covered with a protective layer having a hardness higher than that of the base material and a low coefficient of dynamic friction. Deterioration due to wear of the convex member and the concave member can be prevented while maintaining the geometric strength with the concave member, the alignment accuracy between the first mold and the second mold is improved, and the alignment state is maintained for a long period of time. Can do.

It is a front view which illustrates conceptually the shaping | molding apparatus of 1st Embodiment. It is the figure which expanded the principal part of the shaping | molding apparatus of FIG. (A) is a figure explaining the cross-section of a convex member, (B) is a figure explaining the cross-section of a concave member.

  Hereinafter, a molding apparatus according to an embodiment of the present invention and a method for producing a resin molded product using the molding apparatus will be described with reference to the drawings.

  As shown in FIG. 1, the molding apparatus 10 includes a mold device 40, a fixed platen 11, a movable platen 12, a mold clamping plate 13, an opening / closing drive device 15, and an injection device 16. The molding apparatus 10 enables molding by sandwiching the mold apparatus 40 between the movable platen 12 and the fixed platen 11 and clamping the mold.

  The fixed platen 11 is a support base on the movable side, and is fixed on the support frame 14 so as to face the movable platen 12. The stationary platen 11 detachably supports the stationary mold 41. The fixed platen 11 is fixed to the mold clamping plate 13 via a tie bar 18 so that it can withstand the pressure of mold clamping during molding. The movable platen 12 is a support base on the fixed side, and is supported by the slide guide 19 so as to be movable forward and backward. The movable platen 12 detachably supports the movable mold 42. The mold clamping machine 13 is fixed to the end of the support frame 14. The mold clamping machine 13 supports the movable board 12 from the back via the power transmission part 15d of the opening / closing drive device 15 at the time of mold clamping.

  The opening / closing drive device 15 moves the movable platen 12 forward and backward with respect to the fixed platen 11. That is, the opening / closing drive device 15 expands and contracts the power transmission unit 15d under the control of a control unit (not shown). As a result, the movable platen 12 can move forward and backward freely with respect to the mold clamping plate 13, and as a result, the movable platen 12 and the fixed platen 11 can be moved toward and away from each other. The mold 41 and the movable mold 42 can be clamped and opened. At this time, the slide guide 19 supports the movable plate 12 that advances and retreats from the lower side, and enables a smooth reciprocating movement in the advancing and retreating direction of the movable plate 12.

  The injection device 16 can inject the molten resin from the resin injection nozzle 16d in a temperature controlled state. In the state where the fixed mold 41 and the movable mold 42 are clamped, the injection device 16 brings the resin injection nozzle 16d into contact with a sprue bush (not shown) provided on the fixed platen 11, and a sprue SP (see FIG. 2). On the other hand, the molten resin in the cylinder 16a can be supplied at a desired timing.

  Hereinafter, the mold apparatus 40 will be described with reference to FIG. The mold apparatus 40 includes a fixed mold 41, a movable mold 42, a positioning unit 81, and a displacement mechanism 83. The movable mold 42 is driven by the opening / closing drive device 15 shown in FIG. 1 and can be moved back and forth in the ± Z directions. A mold space for injection molding can be formed by matching the fixed mold 41 and the movable mold 42 with the parting surfaces PS1 and PS2 and clamping the mold.

  The fixed mold 41 is a first mold, and includes a part plate 71 side, that is, an inner mold plate 71 and a mounting plate 73 that supports the mold plate 71 from behind. On the parting surface PS1 side of the mold plate 71, a hollow mold surface S1 extending from the hole of the sprue SP is formed. The mold surface S1 is connected to a hollow mold surface S2 provided on the mold plate 72 of the movable mold 42 when the mold is clamped to form a space or mold space filled with resin. A plurality of convex members 81a, which are one member constituting the positioning portion 81, are fixed to the parting surface PS1 side of the template 71 and project from the parting surface PS1. These convex members 81 a are provided, for example, so as to be embedded in the four corners of the template 71. The convex member 81a is a tapered member having a frustoconical outline, and has a symmetrical shape around the central axis AX1. Although the taper angle of the convex member 81a is emphasized in the drawing, it is actually about 3 ° or less, and preferably about 1 °.

  The movable mold 42 is a second mold, and includes a part plate 72 side, that is, an inner mold plate 72, and a mounting plate 74 that supports the mold plate 72 from behind. A displacement mechanism 83 is provided between the template 72 and the mounting plate 74. On the parting surface PS2 side of the mold plate 72, a mold surface S2 connected to the mold surface S1 provided on the mold plate 71 of the fixed mold 41 is formed at the time of mold clamping. On the parting surface PS2 side of the template 72, a plurality of concave members 81b, which are the other members constituting the positioning portion 81, are fixed, and a recess is formed in the parting surface PS2. These concave members 81 b are arranged so as to face the convex members 81 a of the template 71, and are provided so as to be embedded in the four corners of the template 71, for example. The concave member 81b is a tapered member having a frustoconical hollow profile, and has a symmetrical shape around the central axis AX2. The taper angle of the concave member 81b needs to coincide with the taper angle of the convex member 81a, and is about 3 ° or less as described above, and particularly preferably about 1 °.

  3A is a cross-sectional view illustrating the structure of the convex member 81a provided on the fixed mold 41, and FIG. 3B illustrates the structure of the concave member 81b provided on the movable mold 42. It is sectional drawing.

  As shown in FIG. 3A, the convex member 81 a is formed of a truncated cone-shaped base material 91, and the contact portion 91 a including the conical side surface of the base material 91 has higher hardness than the base material 91. In order to reduce the dynamic friction coefficient, it is covered with a protective layer 93. The protective layer 93 covering the convex member 81a is an inorganic thin film formed by various gas phase growth methods such as physical vapor deposition and chemical vapor deposition, has a hardness higher than that of the substrate 91, and The dynamic friction coefficient is lower than that of the base material 91. The dynamic friction coefficient of the protective layer 93 is 0.4 or less, and the strength of the protective layer 93 is preferably 2500 Hv or more, particularly 4000 Hv or more. The thickness of the protective layer 93 is 3 μm or less, preferably 0.05 μm or more and 1 μm or less.

  As shown in FIG. 3B, the concave member 81b is formed of a block-shaped base material 91 provided with a frustoconical recess RE, and the contact portion 91b including the conical side surface of the base material 91 has a base portion 91b. In order to increase the hardness and reduce the dynamic friction coefficient than the material 91, it is covered with a protective layer 93. The protective layer 93 covering the concave member 81b is an inorganic thin film formed by various gas phase growth methods such as physical vapor deposition and chemical vapor deposition, has a hardness higher than that of the substrate 91, and is The dynamic friction coefficient is lower than that of the material 91. The dynamic friction coefficient of the protective layer 93 is 0.4 or less, and the strength of the protective layer 93 is preferably 2500 Hv or more, particularly 4000 Hv or more. The thickness of the protective layer 93 is 3 μm or less, preferably 0.05 μm or more and 1 μm or less.

  As described above, the convex member 81a and the concave member 81b are covered with the thin protective layer 93 having a hardness higher than that of the base material 91 and having a low dynamic friction coefficient. The alignment by the positioning portion 81 made of 81b can be made smooth and accurate, and deterioration of the convex member 81a and the concave member 81b accompanying the mold opening and closing can be suppressed.

  When the fixed mold 41 and the movable mold 42 shown in FIG. 2 are clamped, the convex member 81a shown in FIG. 3 (A) and the concave member 81b shown in FIG. 3 (B) are fitted. . At this time, the surface 93a of the contact portion 91a provided on the convex member 81a and the surface 93a of the contact portion 91b provided on the concave member 81b are in close contact with each other. Thereby, the fixed mold 41 and the movable mold 42 are finely moved in the XY plane perpendicular to the axial direction, that is, the ± Z direction, and aligned with each other. At this time, since the displacement mechanism 83 is provided on the movable mold 42 side, minute displacement of the movable mold 42 with respect to the fixed mold 41 is allowed during mold clamping.

  In addition, in order to smoothly perform fitting and separation operations of the convex member 81a and the concave member 81b and prevent deterioration of wear and the like, the contact portion 91a of the convex member 81a and the contact portion of the concave member 81b The coaxiality with 91b is preferably 4 μm or less, and the coaxiality between the contact portion 91a of the convex member 81a and the contact portion 91b of the concave member 81b is preferably 15 μm or less.

  In FIG. 2, the displacement mechanism 83 provided between the template 72 and the mounting plate 74 includes a fixed plate 83a, an alignment plate 83b, a plurality of connecting portions 83c, and a support portion 83d. The fixed plate 83a and the alignment plate 83b are disposed to face each other, the fixed plate 83a is fixed to the mounting plate 74, and the alignment plate 83b is fixed to the template 72.

  Connecting portions 83c that connect the fixed plate 83a and the alignment plate 83b are provided so as to be embedded in the four corners between the fixed plate 83a and the alignment plate 83b. Each connecting portion 83c is embedded and fixed in the fixing plate 83a on the base side on the left side (-Z side) in the drawing, and is embedded and fixed in the alignment plate 83b on the tip side on the right side (+ Z side) in the drawing. Yes. The connecting portion 83c can expand and contract in the axial direction, that is, the ± Z direction. Further, both ends of the connecting portion 83c in the axial direction, that is, the ± Z direction are allowed to move to some extent in the XY plane perpendicular to the axial direction, that is, the ± Z direction. The connecting portion 83c is configured using components that allow displacement, such as a spring and a ball plunger.

  The support part 83d has a sliding part 83g and a base part 83h. The support portion 83d prevents the alignment plate 83b from shifting downward, that is, in the −Y direction. In other words, the connecting portion 83c detects that the alignment plate 83b, that is, the template 72 is displaced in the XY plane when a relatively weak urging force in the X direction or the Y direction is applied to the alignment plate 83b, that is, the template 72. It is acceptable to support the load of the template 72. For this reason, the support portion 83d supports the alignment plate 83b from below by the base portion 83h, and allows movement in the ± Z direction by the sliding portion 83g. The base 83h is formed of a material having flexibility that does not hinder the movement of the alignment plate 83b, that is, the template 72 in the vertical direction, that is, the ± Y direction. The sliding portion 83g is configured using a component that allows displacement, such as a ball plunger. Although not shown, the support portion 83d has a position adjusting mechanism, and the alignment plate 83b, that is, the template 72 is moved in advance in the XY plane perpendicular to the axial direction, that is, the ± Z direction. Can be held in a state.

  Hereinafter, manufacture of a lens etc. using the shaping | molding apparatus 10 of FIG. 1 is demonstrated. First, in a state where the fixed mold 41 and the movable mold 42 are heated to a temperature suitable for molding, the open / close driving device 15 is operated to advance the movable platen 12 to start mold closing. Even when the movable platen 12 moves to the fixed platen 11 side and the mold closing is completed until the fixed die 41 and the movable die 42 come into contact with each other, the closing operation of the opening / closing drive device 15 is further continued. Then, mold clamping is performed to clamp the fixed mold 41 and the movable mold 42 with a necessary pressure. At this time, the positioning unit 81 and the displacement mechanism 83 perform precise alignment of the movable mold 42 with respect to the fixed mold 41 in the XY plane. Next, the injection device 16 is operated to inject the molten resin into the mold space between the clamped fixed mold 41 and the movable mold 42 with a necessary pressure. Thereafter, the fixed mold 41 and the movable mold 42 are slowly cooled, so that the molten resin in the mold space formed between the fixed mold 41 and the movable mold 42 is slowly cooled. When the molten resin is cooled and sufficiently cured, the opening / closing drive device 15 is operated to open the movable platen 12. Along with this, the movable mold 42 moves backward, and the fixed mold 41 and the movable mold 42 are separated. As a result, a resin molded product (specifically, a lens) can be taken out between the fixed mold 41 and the movable mold 42.

  As described above, according to the molding apparatus 10 of the present embodiment, the contact portion 91a of the convex member 81a and the contact portion 91a of the concave member 81b are covered with the protective layer 93. By selecting the material, it is possible to prevent deterioration due to wear of the convex member 81a and the concave member 81b while maintaining the shape strength of the convex member 81a and the concave member 81b. As a result, the alignment accuracy between the fixed mold 41 and the movable mold 42 can be increased and the alignment state can be maintained for a long period of time, so that the shape accuracy of the resin molded product can be maintained with a high degree of accuracy over a long period of time.

〔Example〕
Hereinafter, specific examples of the molding apparatus 10 shown in FIG. 1 and the like and a method for producing a resin molded product using the molding apparatus 10 will be described.

  Table 1 explains the configuration and properties of specific examples of the convex member 81a and the concave member 81b. In this example, convex members 81a and concave members 81b having three types of configurations A to C were produced and evaluated.

  As shown in Table 1, in the configurations A to C, alloy tool steel was used for the base material as the base material 91 of the convex member 81a and the concave member 81b. The hardness of the base material as the base material 91 is 58 to 62 Hrc. Moreover, the coaxiality of the contact part 91a of the convex member 81a of the structures A to C and the contact part 91b of the concave member 81b is 4 μm or less, and the parallelism is 2 μm to 15 μm. The taper angle of the convex member 81a and the concave member 81b is 3 °.

  In the convex member 81 a and the concave member 81 b of the configuration A, an AlCrN film is formed as the protective layer 93. For the formation of the AlCrN film, for example, a SIP (sputter ion plating) method is used (processing temperature 200 to 300 ° C.). The standard film thickness of the protective layer 93 is 1 μm to 3 μm. The protective layer 93 has a surface strength of 4500 Hv and a dynamic friction coefficient of 0.4.

  In the convex member 81 a and the concave member 81 b of the configuration B, a DLC-based A film is formed as the protective layer 93. This DLC system A film is a film in which the composition of DLC is changed to improve hardness and slidability. For example, an ion gun method is used to form the DLC-based A film (processing temperature 200 ° C.). The standard film thickness of the protective layer 93 is 0.1 μm to 1 μm. The protective layer 93 has a surface strength of 7000 Hv and a dynamic friction coefficient of 0.1.

  In the convex member 81 a and the concave member 81 b of the configuration C, a DLC-based B film is formed as the protective layer 93. The DLC-based B film does not contain hydrogen and is a tetrahedral amorphous carbon film (ta-C). For example, an AIP (arc ion plating) method is used to form the DLC-based B film (processing temperature: 100 to 200 ° C.). The standard film thickness of the protective layer 93 is 1 μm. Further, the surface strength Hv of the protective layer 93 is 5000 Hv to 8000 Hv.

  The lower part of Table 1 shows the results of an acceleration test in which a displacement of 50 μm is given to the parting surfaces SP1 and PS2 of the fixed mold 41 and the movable mold 42.

  In the convex member 81a and the concave member 81b of Configuration A, the initial variation was 0.2 μm and the period was 1000 to 3000 shots. The overall variation after 50000 shots excluding the initial variation was 0.1 μm. The variation between shots was 0.1 μm. Further, the convex member 81a of the configuration A was hardly worn and no grease was required.

  In the convex member 81a and the concave member 81b of Configuration B, the initial variation was 0.5 μm, and the period was 1000 shots. The total variation after 50000 shots excluding initial variation was 0.1 μm up to 25000 shots. The variation between shots was 0.15 μm. Further, the convex member 81a of the configuration A was slightly worn on the upper side, but no grease was required.

  In the convex member 81a and the concave member 81b of the configuration C, the initial variation was 0.4 μm and the period was 1000 shots. The overall variation after 50000 shots excluding the initial variation was 0.1 μm. The variation between shots was 0.3 μm. Further, the convex member 81a of the configuration C was hardly worn and no grease was required.

  In the above, with respect to the initial fluctuation and the period, the initial fluctuation was 0.5 μm or less and the period was generally less than 2000 shots, and both the convex member 81a and the concave member 81b of the configurations A to C were good. Moreover, about the whole fluctuation | variation, both the convex member 81a of the structures AC and the concave member 81b were 0.1 micrometer or less, and were favorable. Further, regarding the variation between shots, both the convex member 81a and the concave member 81b of the configurations A to C were 0.3 μm or less, which was favorable. Regarding the variation between shots, the convex members 81a and the concave members 81b of the configurations A and B were 0.15 μm or less, which was very good.

  Table 2 explains the configuration and properties of the convex member 81a and the concave member 81b in the comparative example.

  In the comparative example, a convex member 81a and a concave member 81b having three types of structures D to F were produced and evaluated. For the convex members 81a and concave members 81b having configurations D to F, a friction mechanism section as a displacement mechanism 83 is provided in the molding die 40, and a protective layer 93 is also formed. In the configurations D to F, alloy tool steel was used for the base material as the base material 91 of the convex member 81a and the concave member 81b, as in the above example. Moreover, the coaxiality of the contact part 91a of the convex member 81a of the structures D to F and the contact part 91b of the concave member 81b is 4 μm or less as in the above example, and the parallelism is the same as that in the above example. Similarly, it is 2 μm to 15 μm. Further, the taper angles of the convex member 81a and the concave member 81b are 3 ° as in the above-described embodiment.

  As shown in Table 2, in the convex member 81a and the concave member 81b of the configuration D, the protective layer 93 is formed with a coat D that is very excellent in anti-adhesion property, has lubricity, and exhibits extremely low frictional resistance. Yes. For the film formation of the coat D, for example, a PVD method is used. The standard film thickness of the protective layer 93 is 1 μm to 2 μm. The surface strength of the protective layer 93 is 400 Hv to 1000 Hv, and the dynamic friction coefficient is 0.02.

  In the convex member 81 a and the concave member 81 b of the configuration E, a TiCN film is formed as the protective layer 93. For the formation of the TiCN film, for example, an HCD (hollow cathode method) method or an AIP (arc ion plating) method is used (processing temperature 500 ° C.). The standard film thickness of the protective layer 93 is 3 μm to 4 μm. The surface strength of the protective layer 93 is 2500 Hv to 3200 Hv, and the dynamic friction coefficient is 0.3.

  In the convex member 81a and the concave member 81b of the configuration F, a TiC film is formed as the protective layer 93. For example, an AIP (arc ion plating) method is used for forming the TiC film (processing temperature 500 ° C.). The standard film thickness of the protective layer 93 is 5 μm to 6 μm. The surface strength of the protective layer 93 is 3000 Hv to 3700 Hv, and the dynamic friction coefficient is 0.1.

  The lower part of Table 2 shows the result of the acceleration test in which a 50 μm shift is given to the parting surfaces SP1 and PS2 of the fixed mold 41 and the movable mold 42 as in Table 2. In the convex member 81a and the concave member 81b of Configuration D, the initial variation was 0.5 μm and the period was 15000 shots. The overall variation after 50000 shots excluding the initial variation was 1.6 μm. The variation between shots was 0.1 μm. Further, the convex member 81a of the configuration D was worn on the upper side, and grease was necessary.

  In the convex member 81a and the concave member 81b of configuration E, the initial variation was 0.2 μm and the period was 2000 shots. The overall variation after 50000 shots excluding the initial variation was 0.6 μm. The variation between shots was 0.15 μm. Further, the convex member 81a of the configuration E was worn on the upper side and required grease.

  In the convex member 81a and the concave member 81b having the configuration F, the initial variation was 0.2 μm, and the period was 5000 shots or less. The total variation after 50000 shots excluding the initial variation was 0.2 μm. In addition, the fluctuation | variation between shots was 0.2 micrometer-0.4 micrometer. Further, the convex member 81a of the configuration F was worn on the upper side, and grease was necessary.

  In the comparative example described above, the initial variation and the period of the configuration D with the reduced friction coefficient have an initial variation of 0.5 μm and a period of 15000 shots or more. The convex member 81a and the concave member 81b of the configuration D are It was bad. In addition, regarding the overall variation, the initial variation of the convex member 81a and the concave member 81b of Configuration D was 1.6 μm, and the improvement effect was small. Regarding the initial variation and period of the structure E having a thick protective film of 4 μm, the initial variation was 0.2 μm and the period was normal at 2000 shots, but the overall variation was 0.6 μm and the improvement effect was not sufficient. . In addition, the initial fluctuation and the period in the structure F having a thick protective film of 6 μm have an initial fluctuation of 0.2 μm and a period of 5000 shots or less, and the improvement effect is low. However, the improvement between shots was 0.4 μm, and the improvement effect was low.

  In summary, in the case of the configurations A to C of the example, the period of the initial variation is extremely short compared to the cases of the configurations D to F of the comparative example. Further, in the case of the configurations A to C of the example, the overall variation can be suppressed to 0.1 μm or less as compared with the configurations D to F of the comparative example. Further, in the case of the configurations A to C of the embodiment, the variation between shots can be suppressed to some extent as compared with the configurations D to F of the comparative example.

  Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, the convex member 81 a is provided on the fixed mold 41 and the concave member 81 b is provided on the movable mold 42. However, the concave member 81 b is provided on the fixed mold 41 and convex on the movable mold 42. A shaped member 81a can also be provided.

  In the above embodiment, the displacement mechanism 83 is provided on the movable mold 42 side for alignment, but the displacement mechanism 83 is provided on the fixed mold 41 side for alignment. It is also possible to perform alignment by providing a displacement mechanism 83 in both of 42 and the fixed mold 41.

  In the above embodiment, the mold plate 71 provided in the fixed mold 41 and the mold plate 72 provided in the movable mold 42 have been described as if they were a single member. A core member having a transfer surface can be embedded.

  In the above embodiment, the molding apparatus 10 is a horizontal type, that is, the fixed mold 41 and the movable mold 42 are horizontally opposed to each other, but the present invention is not limited to this. That is, a vertical injection molding machine in which the fixed mold 41 and the movable mold 42 are arranged to face each other in the vertical direction can be used.

  In the above embodiment, the molding apparatus 10 is an apparatus for molding a thermoplastic resin. However, the molding apparatus 10 is appropriately modified to form an apparatus for molding a thermosetting resin. be able to. In addition, the resin molded product manufactured with the shaping | molding apparatus 10 can be not only a lens but an optical element other various products.

DESCRIPTION OF SYMBOLS 10 Molding device 11 Fixed platen 12 Movable platen 13 Clamping platen 15 Opening / closing drive device 16 Injection device 18 Tie bar 19 Slide guide 40 Mold device 41 Fixed die 42 Movable die 71, 72 Mold plate 73, 74 Mounting plate 81 Positioning part 81a Convex member 81b Concave member 83 Displacement mechanism 83a Fixing plate 83b Alignment plate 83c Connection part 83d Support part 91 Base material 91a, 91b Abutting part 93 Protective layer 93a Surface AX1, AX2 Central axis PS1, PS2 Parting surface S1, S2 mold surface

Claims (7)

A first mold;
A second mold that forms a mold space by being clamped to the first mold;
A positioning portion for positioning the first mold and the second mold when clamping the first mold and the second mold;
A displacement mold for displacing at least one of the first mold and the second mold in a direction perpendicular to the opening and closing direction according to a pressing force at the time of clamping,
The positioning portion includes a convex member fixed to one of the first mold and the second mold, and a concave member fixed to the other of the first mold and the second mold. And
The contact portion of the convex member and the contact portion of the concave member are covered with a protective layer,
The molding apparatus according to claim 1, wherein the protective layer has a higher hardness than the base material and a low coefficient of dynamic friction.   The molding apparatus according to claim 1, wherein the contact portion of the convex member and the contact portion of the concave member are in direct contact with each other without a lubricant.   The molding apparatus according to claim 1 or 2, wherein the protective layer is a thin film having a coefficient of dynamic friction of 0.4 or less and a strength of 2500 [Hv] or more.   The molding apparatus according to claim 1, wherein the protective layer has a thickness of 3 μm or less.   The concentricity of the contact portion of the convex member and the contact portion of the concave member is 4 μm or less, and the parallelism between the contact portion of the convex member and the contact portion of the concave member is 15 μm. The molding apparatus according to claim 1, wherein the molding apparatus is as follows.   The molding apparatus according to claim 1, wherein the contact portion of the convex member and the contact portion of the concave member are tapered members. A positioning portion for positioning the first mold and the second mold when the first mold and the second mold are clamped to form a mold space; and the first mold A method of manufacturing a resin molded product using a molding die including a displacement mechanism that displaces at least one of the second die in a direction perpendicular to the opening and closing direction according to a pressing force at the time of clamping. And
The positioning portion includes a convex member fixed to one of the first mold and the second mold, and a concave member fixed to the other of the first mold and the second mold. And
The contact portion of the convex member and the contact portion of the concave member are covered with a protective layer,
The method for producing a resin molded product, wherein the protective layer has a hardness higher than that of the base material and a low coefficient of dynamic friction.