JP5374424B2 - Mold for molding and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold in which positioning between a stationary side molding surface and a movable side molding surface is improved by fitting a tapered protrusion part to a tapered recessed part on a prescribed position. <P>SOLUTION: A spacer pushing-out member 28 and a movable side product spacer 17 pushed-out by the spacer pushing-out member 28 are arranged freely attachably and detachably to each other such that the clearance 21 between a stationary side nesting 12 and a stationary side mold plate 3 and the clearance 22 between a movable side nesting 13 and a movable side mold plate 6 are set to be each 15 &mu;m or less and the sum of the clearance 21 and the clearance 22 amounts to 20 &mu;m or more. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a molding die and a molding method for forming a cavity between a fixed die and a movable die, and in particular, by aligning the molding surfaces of the fixed die and the movable die. The present invention relates to a molding die and a molding method for forming a cavity by clamping.

In general, a resin optical element such as a lens forms a cavity between the fixed mold and the movable mold by aligning the molding surfaces of the fixed mold and the movable mold so as to inject a molten resin into the cavity. It is molded by that.
In such a mold for molding an optical element, a fixed-side insert and a movable-side insert that form a fixed-side molding surface and a movable-side molding surface are fitted at predetermined positions, so that the molded optical element is offset. There is something that suppresses the lead. A tapered recess and a tapered projection are formed in the fixed side insert and the movable side insert, respectively, and the tapered recess and the tapered projection are positioned relative to each other using the clamping force of the fixed side mold and the movable side mold. Fit together at a predetermined position. In this manner, the fixed side molding surface and the movable side molding surface can be aligned with high accuracy.
In recent years, it has been required to align the fixed-side molding surface and the movable-side molding surface with higher accuracy to suppress the eccentricity of the optical element.

  Therefore, for example, in Patent Document 1, a ball retainer is interposed in a portion that forms the molding surface of the fixed side insert and the movable side insert, and the positions of the fixed side molding surface and the movable side molding surface are determined using the elasticity of the ball. It has been proposed to align with high accuracy.

JP 2002-225086 A

  However, in such a molding die, one of the fixed side insert and the movable side insert is fixed to the piece protruding member for taking out the molded product, and the tapered concave portion and the taper at the time of fitting are fixed. The alignment with the convex portion is performed within the range of the clearance between the other nesting and the template on which it is arranged. For this reason, for example, when an optical element is molded using a cyclic polyolefin-based resin, in order to align the tapered concave portion and the tapered convex portion so as to obtain an eccentricity accuracy of 2 μm or less, the other nesting side It was necessary to set the clearance (clearance for positioning) to 20 μm or more. On the other hand, the runner is formed so as to cross the clearance, and if the clearance is 20 μm or more, molten resin passing through the runner flows into the clearance, and the tapered concave portion and the tapered convex portion may not be fitted at a predetermined position. was there. Further, if the mold accuracy is increased so as to narrow the clearance, the cost for mold production becomes high. In particular, in the case of a mold for molding a large number of products at the same time, the mold production may be costly.

  The present invention has been made to solve such a conventional problem, and the positions of the fixed side molding surface and the movable side molding surface are obtained by fitting the tapered convex portion and the tapered concave portion at predetermined positions. An object of the present invention is to provide a molding die and a molding method capable of improving the alignment.

  In order to achieve the above object, a molding die according to the present invention includes a stationary side product piece on which a stationary side molding surface is formed and a stationary side holding member that supports the stationary side product piece from the outside. A movable side insert having a nest inserted in the fixed side mold plate and a movable side product piece formed with a movable side molding surface and a movable side holding member for supporting the movable side product piece from outside is fitted in the movable side mold plate. The fixed-side molding surface and the movable-side molding are formed by fitting a tapered concave portion formed on one of the fixed-side holding member and the movable-side holding member with a tapered convex portion formed on the other. And a ball retainer for sliding is disposed between at least one of the fixed side holding member and the fixed side product piece and between the movable side holding member and the movable side product piece, The fixed side template and the movable A side gate type molding die in which a piece projecting member for projecting the fixed product piece or the movable product piece is movably disposed on one of the mold plates, the piece projecting member and the piece The movable-side product piece or the fixed-side product piece that is projected by a projecting member is arranged so as to be able to contact and separate from each other, and the clearance between the fixed-side insert and the fixed-side template and the movable-side insert and the movable The clearance between the side mold plates is 15 μm or less, and the total of the clearance between the fixed side insert and the fixed side mold plate and the clearance between the movable side insert and the movable side plate is 20 μm or more. It is what.

  Here, the fixed side insert or the movable side insert may have a return mechanism for returning the fixed side product piece or the movable side product piece protruded by the piece protruding member to the original position.

  The return mechanism may include a return pin that returns the fixed-side product piece or the movable-side product piece due to abutment between the fixed-side insert and the movable-side insert during mold clamping. The return mechanism may include a spring disposed in the fixed side insert or the movable side insert. The return mechanism may include a cylinder mechanism arranged inside the fixed side insert or the movable side insert.

  Moreover, the shaping | molding method which concerns on this invention shape | molds using the metal mold | die in any one of said.

  According to the present invention, it is possible to improve the alignment of the fixed molding surface and the movable molding surface by fitting the tapered convex portion and the tapered concave portion at a predetermined position.

It is sectional drawing which shows the structure of the metal mold | die concerning this embodiment of this invention. It is sectional drawing which shows the structure of the movable side nest used in this embodiment. (A) is sectional drawing which shows the modification at the time of shaping | molding of a movable side nest (before product protrusion), (B) is sectional drawing which shows the modification of the movable side nest at the time of taking out a molded article, (C) FIG. 9 is a cross-sectional view showing a modified example of the movable side insert during mold clamping. It is sectional drawing which shows the other modification of a movable side nest. It is sectional drawing which shows the further another modification of a movable side nest.

  Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  FIG. 1 shows a configuration of a molding die according to an embodiment of the present invention. The molding die includes a fixed-side die 1 and a movable-side die 2 that is disposed below the fixed-side die 1 in FIG. Have. Although the present embodiment will be described using a molding die that opens and closes in the vertical direction, the molding die may be opened and closed in the left-right direction.

The fixed side mold 1 has a fixed side mold plate 3. The fixed-side mold plate 3 is configured such that a mold member 4 that forms the lower surface of the fixed-side mold plate 3 and a mold member 5 that is disposed on the upper surface side of the mold member 4 are stacked and fixed to each other. On the other hand, the movable mold 2 has a movable mold plate 6. The movable side mold plate 6 is disposed along the edge of the mold member 7 that forms the upper surface of the movable side mold plate 6, the mold member 8 that is disposed on the lower surface side of the mold member 7, and the lower surface of the mold member 8. The mold member 9 and the mold member 10 which is disposed on the lower surface of the mold member 9 and forms the lower surface of the movable side mold plate 6 are laminated and fixed to each other.
As shown in FIG. 1, in a state where the fixed mold 1 and the movable mold 2 are clamped, a product such as a lens to be molded is formed between the lower surface of the mold member 4 and the upper surface of the mold member 7. A cavity 11 having a shape is formed. The shape of the cavity 11 includes a fixed side insert 12 having a molding surface that penetrates the mold member 4 in the vertical direction and forms the upper surface of the cavity 11, and a molding surface that penetrates the mold member 7 in the vertical direction and forms the lower surface of the cavity 11. It is formed by fitting the movable side insert 13 having a predetermined position.

The fixed-side insert 12 includes a fixed-side product piece 14 and a fixed-side holding member 15 that is fitted into the mold member 4 so as to surround the outer periphery of the fixed-side product piece 14. The fixed-side product piece 14 penetrates the mold member 4 in the vertical direction and forms the upper surface of the cavity 11 with the molding surface formed on the lower surface thereof. The fixed-side holding member 15 is disposed concentrically with the fixed-side product piece 14 and supports the fixed-side product piece 14 from the outside. On the lower surface of the fixed-side holding member 15, a tapered concave portion 16 is formed with a taper around the molding surface of the fixed-side product piece 14. The fixed-side product piece 14 and the fixed-side holding member 15 are supported from the upper surface side by the mold member 5.
On the other hand, the movable-side insert 13 includes a movable-side product piece 17, a movable-side holding member 18 that surrounds the outer periphery of the movable-side product piece 17 and is fitted into the mold member 7, and the movable-side product piece 17 and the movable-side holding member 18. And a ball retainer 19 disposed between the two. The movable product piece 17 penetrates the mold member 7 in the vertical direction, and forms a lower surface of the cavity 11 with a molding surface formed on the upper surface thereof. The movable-side holding member 18 is disposed concentrically with the movable-side product piece 17 and supports the movable-side product piece 17 from the outside. On the upper surface of the movable side holding member 18, a tapered convex portion 20 is formed with a taper around the molding surface of the movable product piece 17. A ball retainer 19 having a plurality of steel balls arranged in a cylindrical shape is interposed between the outer peripheral surface of the movable product piece 17 and the inner peripheral surface of the movable side holding member 18. The ball retainer 19 matches the central axes of the movable product piece 17 and the movable side holding member 18 with high accuracy using the elasticity of the steel ball. The movable product piece 17 and the movable holding member 18 are supported by the mold member 8 from the lower surface side.
Note that the taper angle of the tapered concave portion 16 of the fixed side holding member 15 and the taper convex portion 20 of the movable side holding member 18 are the same, and the two are fitted at a predetermined position in accordance with the shape thereof. The cavity 11 having a predetermined shape can be formed by matching the positions of the molding surface of the product piece 14 and the molding surface of the movable product piece 17 with the direction perpendicular to the clamping direction. Further, clearances 21 and 22 are formed between the fixed side insert 12 and the mold member 4 and between the movable side insert 13 and the mold member 7 so that molten resin for molding the product does not flow in. Yes. Here, the clearances 21 and 22 that do not allow the molten resin to flow in may be, for example, that the clearances 21 and 22 are each 15 μm or less and the total of the clearances 21 and 22 is 20 μm or more. Examples of the molten resin used here include cyclic polyolefin (COP) or polymethyl methacrylate such as ZEONEX 480R (manufactured by Nippon Zeon), ZEONEX-E48R (manufactured by Nippon Zeon), PMMA VH-001 (manufactured by Mitsubishi Rayon), and the like. Resins such as (PMMA) can be used.

  A recess extending along the upper surface from the cavity 11 is formed on the upper surface of the mold member 7, and a passage extending in communication with the cavity 11 between the recess of the mold member 7 and the lower surface of the mold member 4 at the time of clamping. 23 is formed. Further, an injection port 24 through which molten resin is injected is formed on the upper surface of the mold member 5, and a through-hole 25 that penetrates from the injection port 24 to the lower surface of the mold member 4 is formed in the mold members 4 and 5. Yes. The passage 23 formed between the mold members 4 and 7 and the through hole 25 formed in the mold members 4 and 5 communicate with each other to form a runner 26. That is, the runner 26 extends from the injection port 24 of the mold member 5 to the cavity 11.

  A movable plate 27 that is movable in the vertical direction is disposed inside the mold member 9 and on the upper surface side of the mold member 10. A piece protrusion member 28, an ejector pin 29, and a return member 30 are fixed to the moving plate 27. The piece projecting member 28 penetrates the mold member 8, and the tip thereof faces the lower surface of the movable product piece 17. The ejector pin 29 passes through the mold members 7 and 8, and the tip thereof faces the runner 26. The return member 30 penetrates the mold members 7 and 8, and the tip thereof faces the mold member 4 of the fixed-side mold plate 3. When the movable side mold 2 moves downward relative to the fixed side mold 1 and is opened, the movable side product piece is moved by the piece protruding member 28 as the moving plate 27 moves in the direction of the mold member 8. 17 is protruded upward to protrude the resin located in the cavity 11, and the ejector pin 29 is moved to protrude the resin positioned in the runner 26. Thereby, the molded product can be taken out from the mold.

  FIG. 2 shows the configuration of the movable side insert 13. The movable product piece 17 is slidably disposed along the inner peripheral surface of the movable side holding member 18. Further, the movable product piece 17 smoothly and stably stabilizes the inner peripheral surface of the movable side holding member 18 by the rotation of the steel balls of the ball retainer 19 interposed between the movable side product piece 17 and the movable side holding member 18. Can slide. The movable-side product piece 17 and the piece projecting member 28 are not fixed and are disposed so as to be able to contact and separate from each other. As described above, the movable side product piece 17 and the piece protruding member 28 can be brought into and out of contact with each other, so that the fixed side insert 12 and the movable side insert 13 can be connected to the fixed side mold 1 and the movable side mold 2 at the time of clamping. The molds are aligned with each other within the clearances 21 and 22 using the clamping force.

  Next, the operation of the molding die shown in FIG. 1 will be described.

  First, the movable mold 2 is moved upward in FIG. 1 with respect to the fixed mold 1, and the tapered protrusion 20 of the movable holding member 18 is fitted along the tapered recess 16 of the fixed holding member 15. Go together. At this time, the fixed side insert 12 and the movable side insert 13 are fitted while being aligned with each other within the clearances 21 and 22 using the clamping force of the fixed side mold 1 and the movable side mold 2. Go. Here, the clearances 21 and 22 are set to be, for example, 15 μm or less, and the total of both is 20 μm or more. In this way, the tapered concave portion 16 and the tapered convex portion 20 are fitted at predetermined positions according to the shape thereof, so that the molding surface of the fixed side insert 12 and the molding surface of the movable side insert 13 are aligned. Thus, the cavity 11 is formed.

  In this way, the movable side product piece 17 and the piece protruding member 28 are arranged so as to be able to contact and separate from each other, so that the fixed side insert 12 and the movable side insert 13 are aligned with each other within the range of the clearances 21 and 22. Thus, the position adjustment range of both is widened, and it is possible to prevent the fitting at a predetermined position from being shifted due to one piece or the like.

  When the cavity 11 is formed by clamping the fixed side mold 1 and the movable side mold 2, a molten resin such as ZEONEX 480R (manufactured by Nippon Zeon) is injected from the injection port 24. The injected molten resin is injected into the cavity 11 through a runner 26 that traverses clearances 21 and 22 set to an extent that the molten resin does not flow, for example, 15 μm or less.

When the molten resin injected into the cavity 11 is solidified to form a molded product, the movable side mold 2 is moved downward relative to the fixed side mold 1 to open the mold. Subsequently, the moving plate 27 is moved in the direction of the mold member 8, the piece projecting member 28 projects the movable product piece 17 upward, and the ejector pin 29 projects upward. As a result, the molded product is taken out from the mold.
Further, when the movable mold 2 is moved upward with respect to the fixed mold 1 and clamped, the return member 30 is returned to the original position due to the contact between the fixed mold 3 and the movable mold 6. Returned to As a result, the movable plate 27 is returned to the original position, the piece projecting member 28 and the ejector pin 29 are returned to the original position, and molding of the next molded product is started.

  According to the present embodiment, the fixed side insert 12 and the movable side insert 13 are aligned with each other within the range of the clearances 21 and 22, so that the position adjustment range of both can be expanded, and the fixed side molding surface and the movable side insert The molding surface can be aligned with high accuracy.

In the present embodiment, the movable side insert 13 further has a return mechanism for returning the movable side product piece 17 protruding by the piece protruding member 28 to the original position after the mold is opened and the molded product is taken out. May be.
For example, as shown in FIG. 3A, the movable-side insert 13 is fixed and movable at both ends of the fixed plate 40 with the movable-side product piece 17 sandwiched between the fixed plate 40 that fixes the movable-side product piece 17 on the upper surface. A return pin 41 penetrating to the upper surface of the side holding member 18 can be newly provided. When the piece projecting member 28 is moved upward by the moving plate 27 when the mold is opened, the movable product piece 17 and the return pin 41 are held on the movable side by moving the fixed plate 40 upward as shown in FIG. It protrudes from the member 18. When the molded product is taken out from the mold in this way, as shown in FIG. 3C, only the piece protruding member 28 is returned to the original position as the movable plate 27 returns to the original position. Subsequently, when the movable mold 2 is moved and clamped with respect to the fixed mold 1, the return pin 41 is returned to the original position due to the contact between the fixed insert 12 and the movable insert 13. However, since the fixed plate 40 is fixed to the return pin 41, the fixed plate 40 and the movable product piece 17 are returned to their original positions together with the return pin 41.
In addition, as shown in FIG. 4, the movable side insert 13 can be additionally provided with a spring 42 between the movable side product piece 17 and the movable side holding member 18. After the mold is opened and the molded product is taken out from the mold by the protrusion of the piece protruding member 28, the movable product piece 17 is returned to the original by the elastic force of the spring 42 as the piece protruding member 28 returns to its original position. Return to position.
Further, as shown in FIG. 5, the movable product piece 17 may be returned to the original position by using air pressure or the like. For example, the air pressure adjusting means 43 is disposed outside the movable mold 2 and a through-hole 44 penetrating from the outside of the movable mold 2 to the inside of the movable insert 13 is formed. O-rings 45 are respectively disposed between the movable mold 2 and the movable holding member 18 and between the movable holding member 18 and the movable product piece 17 so as not to leak. Thus, after the mold is opened and the molded product is taken out from the mold by the protrusion of the piece protruding member 28, when the piece protruding member 28 is returned to its original position, air is supplied from the air pressure adjusting means 43, and the air pressure is increased. Thus, the movable product piece 17 is returned to the original position.

  In the molding die of this embodiment, one cavity 11 is formed between the fixed side mold 1 and the movable side mold 2, but the fixed side molding surface and the movable side molding surface are aligned with each other. If possible, a plurality of cavities may be formed. For example, in FIG. 1, the runner 26 may have a plurality of passages 23 that are branched from each other so as to communicate with the through hole 25, and a plurality of cavities may be arranged and formed so as to communicate with the respective passages 23. Further, at this time, each cavity is formed by a corresponding fixed side insert and a movable side insert, and if each movable side insert is arranged so as to be able to come into contact with and separate from the piece protruding member, the respective fixed side insert and movable side insert Are aligned with each other within the clearance range, and the fixed-side molding surface and the movable-side molding surface can be aligned with high accuracy in each cavity.

Further, instead of the piece projecting member 28 arranged to project the movable product piece 17, a piece projecting member for projecting the fixed side product piece 14 may be arranged on the fixed side template 3. The fixed-side product piece 14 and the piece-extrusion member that projects the fixed-side product piece 14 are arranged so as to be able to contact and separate from each other. it can.
Further, the molding die of this embodiment uses the ball retainer 19 between the movable product piece 17 and the movable holding member 18, but between the fixed product piece 14 and the fixed holding member 15. In addition, if a similar ball retainer 19 is disposed, it is possible to further increase the accuracy of alignment between the fixed side molding surface and the movable side molding surface.

Example 1
In the case of the molding die of this embodiment (Samples 1 to 3) and the case where the movable product piece 17 and the piece protruding member 28 are fixed in the molding die of this embodiment (Comparative Samples 1 and 2), An example in which the eccentricity of a molded product actually molded is measured will be described. In this example, the temperature in the mold was set to 125 ° C., a molten resin at 280 ° C. was injected into the mold, and the eccentricity of the lens was measured for the molded product taken out after solidification.
As a result, as shown in Table 1, in the sample 1 in which the clearance 21 is 10 μm, the clearance 22 is 10 μm, and the total of the clearances 21 and 22 is 20 μm, the eccentricity of the lens is 0.5 to 1.8 μm. Further, in the sample 2 in which the clearance 21 is 15 μm, the clearance 22 is 5 μm, and the total of the clearances 21 and 22 is 20 μm, the eccentricity of the lens is 0.5 to 1.5 μm. Further, in the sample 3 in which the clearance 21 is 5 μm, the clearance 22 is 15 μm, and the total of the clearances 21 and 22 is 20 μm, the eccentricity of the lens is 0.5 to 1.8 μm. On the other hand, in the comparative sample 1 in which the clearance 21 is 20 μm, the clearance 22 is 10 μm, and the total of the clearances 21 and 22 is 30 μm, the eccentricity of the lens is 0.5 to 1.8 μm. Further, in the comparative sample 2 in which the clearance 21 is 20 μm, the clearance 22 is 5 μm, and the sum of the clearances 21 and 22 is 25 μm, the eccentricity of the lens is 0.5 to 1.5 μm. Thus, in the comparative samples 1 and 2 in which the movable side product piece 17 and the piece projecting member 28 are fixed, in order to mold a lens with the same eccentric accuracy as the samples 1 and 2, the fixed side template 3 and the fixed side plate 3 are fixed. It was necessary to make the clearance 21 with the side insert 12 larger than those of the samples 1 and 2.
Further, when the lens is molded by 500 shots, the eccentricity of the lens of sample 1 is 0.5 to 1.8 μm, the eccentricity of the lens of sample 2 is 0.5 to 2.0 μm, and the eccentricity of the lens of sample 3 is corrected. The eccentricity of the lens of the comparative sample 1 is 2.5 to 4.5 μm, while the eccentricity of the lens of the comparative sample 2 is 1. It turned out that the fluctuation | variation of 5-3.0 micrometers and its eccentric amount becomes large. In addition, in the molding die in which the samples 1 to 3 after 500 shots were molded, the resin residue flowing into the clearances 21 and 22 was not observed, whereas the moldings of the comparative samples 1 and 2 after 500 shots were molded. In the metal mold, resin residue flowing into the clearance 21 was observed. As described above, the molding die for molding the samples 1 to 2 can mold the lens without lowering the accuracy even if it is repeated for a plurality of shots, whereas the molding die for molding the comparative samples 1 and 2 has a plurality of molding molds. It was confirmed that by repeating the shot, the molten resin flows into the clearance 21 and the accuracy of lens molding is lowered.
For these reasons, the fixed side insert 12 and the movable side insert 13 are aligned with each other within the range of the clearances 21 and 22, so that the position adjustment range of both is expanded, and the clearances 21 and 22 are set so that the molten resin does not flow in. It was found that the fixed-side molding surface and the movable-side molding surface can be aligned with high accuracy even if the setting is narrow.
The cavity 11 has the shape of an aspherical concavo-convex lens, and ZEONEX 480R (manufactured by Nippon Zeon) was used as the molten resin.

Example 2
In Example 2, ZEONEX-E48R (manufactured by Nippon Zeon) was used instead of ZEONEX 480R (manufactured by Nippon Zeon) as the molten resin in Example 1, and other conditions were the same as in Example 1 except for the decentering of the lens. Measurements were made.
As a result, as in the first embodiment, when the movable product piece 17 and the piece projecting member 28 are fixed, in order to mold the lens with the same eccentricity accuracy as when the two pieces are not fixed, the fixed side template 3 It was necessary to increase the clearance 21 between the fixed side insert 12 and the fixed side insert 12. Further, when the movable product piece 17 and the piece projecting member 28 are not fixed, the lens can be molded without reducing the accuracy even if the plurality of shots are repeated, whereas when both are fixed, the clearance 21 is obtained by repeating the plurality of shots. It was confirmed that the molten resin flowed into the lens and the accuracy of lens molding decreased.

Example 3
In Example 3, instead of using ZEONEX 480R (manufactured by ZEON Corporation) as the molten resin in Example 1, PMMA VH-001 (manufactured by Mitsubishi Rayon) was used, and the temperature inside the mold was set to 90 ° C., and a molten resin at 250 ° C. was used. The eccentricity of the lens was measured for the molded product that was injected into the mold and taken out after solidification.
As a result, as in the first embodiment, when the movable product piece 17 and the piece projecting member 28 are fixed, in order to mold the lens with the same eccentricity accuracy as when the two pieces are not fixed, the fixed side template 3 It was necessary to increase the clearance 21 between the fixed side insert 12 and the fixed side insert 12. Further, when the movable product piece 17 and the piece projecting member 28 are not fixed, the lens can be molded without reducing the accuracy even if the plurality of shots are repeated, whereas when both are fixed, the clearance 21 is obtained by repeating the plurality of shots. It was confirmed that the molten resin flowed into the lens and the accuracy of lens molding decreased.

DESCRIPTION OF SYMBOLS 1 Fixed side metal mold, 2 Movable side metal mold, 3 Fixed side metal mold, 4, 5, 7, 8, 9, 10 Mold member, 6 Movable side metal mold, 11 Cavity, 12 Fixed side nest, 13 Movable side nest , 14 Fixed side product piece, 15 Fixed side holding member, 16 Tapered concave part, 17 Movable side product piece, 18 Movable side holding member, 19 Ball retainer, 20 Tapered convex part, 21, 22 Clearance, 23 passage, 24 shot Outlet, 25 Through hole, 26 Runner 27 Moving plate, 28 Pole extruding member, 29 Ejector pin, 30 Return member, 40 Fixed plate, 41 Return pin, 42 Spring, 43 Air pressure adjusting means, 44 Through hole, 45 O-ring

Claims (6)

A fixed-side insert having a fixed-side product piece formed with a fixed-side molding surface and a fixed-side holding member that supports the fixed-side product piece from the outside is fitted into the fixed-side mold plate, thereby forming a movable-side molding surface. A movable-side insert having a movable-side product piece and a movable-side holding member that supports the movable-side product piece from the outside is inserted into the movable-side template,
A taper-shaped concave portion formed on one of the fixed-side holding member and the movable-side holding member and a taper-shaped convex portion formed on the other are fitted to each other, whereby the fixed-side molding surface and the movable-side molding surface are Is aligned,
A ball retainer for sliding is arranged between at least one of the fixed side holding member and the fixed side product piece and between the movable side holding member and the movable side product piece,
This is a side gate type molding die in which a piece protruding member for protruding the fixed side product piece or the movable side product piece is movably disposed on one of the fixed side mold plate and the movable side template plate. And
The fixed-side product piece or the movable-side product piece that is protruded by the piece protruding member and the piece protruding member is arranged so as to be able to contact and separate from each other,
The clearance between the fixed side insert and the fixed side mold plate and the clearance between the movable side insert and the movable side mold plate are each 15 μm or less, and between the fixed side insert and the fixed side template. And a total of the clearance between the movable side insert and the movable side mold plate is 20 μm or more.   2. The molding according to claim 1, wherein the fixed-side insert or the movable-side insert has a return mechanism for returning the fixed-side product piece or the movable-side product piece that is protruded by the piece protruding member to an original position. Mold.   3. The molding metal according to claim 2, wherein the return mechanism includes a return pin that returns the fixed-side product piece or the movable-side product piece due to abutment between the fixed-side insert and the movable-side insert during mold clamping. Type.   The molding die according to claim 2, wherein the return mechanism includes a spring disposed inside the fixed side insert or the movable side insert.   The mold for molding according to claim 2, wherein the return mechanism includes a cylinder mechanism disposed inside the fixed side insert or the movable side insert.   A molding method, wherein molding is performed using the molding die according to any one of claims 1 to 5.

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