JPH09267362A - Mold for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for injection molding which can adjust deviation of the centers between a fixed side insert and a movable side insert under a condition where the molds are assembled in the mold for injection molding. SOLUTION: A hooking hole 60 is arranged on the outer periphery of an ejector rod 53 connected with a movable side lens insert 47 in a mold 30 for injecting molding and a rotational mechanism based on a rotational tool is provided and a plurality of hooking holes 65 are arranged on the bottom face 63 of a flange part 61 of the ejector rod 53 and a screw member 64 is screwed in a screw hole on the lower plate 52 of an ejector pin plate and a rotation restricting mechanism is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold used for molding plastic parts such as plastic lenses, and more particularly to molding circular plastic parts such as circular plastic lenses in the plastic parts. The present invention relates to an injection mold suitable for.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 61-266216 discloses an injection molding die for plastic parts such as plastic lenses.
FIG. 10 described as a conventional injection molding die in Japanese Patent Publication No.
A mold having the above structure is known.

That is, the injection molding die 1 shown in FIG.
It is composed of a fixed mold part 2 and a movable mold part 3, and both mold parts 2 and 3 are configured so that they can be fixedly joined and separated at their joint surfaces (mold matching surfaces) 4.

One fixed mold part 2 is composed of a fixed side mold plate (core plate) 5 and a fixed side mounting plate 6 for mounting the fixed side mold plate 5, and a fixed side sleeve 7 is inserted into the core plate 5 through an injection molded product. The fixed side lens insert 8 having a lens molding surface obtained by reversing a predetermined shape of the plastic lens is fitted, the fixed side lens insert 8 is fixed by a mounting bolt 9, and a taper bush 10 is attached. There is.

Further, the core plate 5 has a spool 11 which is a runner, a runner 12 and a molding surface of the movable side lens insert paired with a molding surface of the fixed side lens insert 8 in the central portion of the core plate 5. A gate 14 for the cavity 13 is provided.

The other movable mold part 3 is composed of a movable side mold plate (cavity plate) 15 and a mounting plate 19 for the movable side mold plate 15, and the fixed side lens insert 8 is provided in the cavity plate 15 via a movable side sleeve 16. The movable side lens insert 17 having a forming surface that makes a pair with the forming surface of the cavity plate 15 is fitted between the receiving plate 18 of the receiving plate of the cavity plate 15 and the mounting plate 19 of the cavity plate 15. The protrusion plates 21 and 22 provided inside the spacer block 20 are connected to the upper end 23a of the protrusion rod 23 whose rear end 23b is held.

Further, the cavity plate 15 has
A taper guide 24 fitted to the taper bush 10 mounted on the core plate 5 is mounted, and a slide hole 26 for a gate shut pin 25 having a rear end 25a connected to the protruding plates 21 and 22 is provided in the central portion. ing.

Therefore, the injection molding die 1 having such a structure has at least two pairs of tapered bushes 10.
The taper guide 24 and the taper guide 24 are embedded in the core plate 5 and the cavity plate 15, so that the misalignment between the fixed-side lens insert 8 and the movable-side lens insert 17 can be suppressed and the molding accuracy of the molded product can be improved. It is a thing.

[0009]

However, also in the above-mentioned conventional injection molding die 1, the core plate 5 is used.
The inner diameter of the fitting hole that is opened when the fixed-side lens insert 8 is fitted in is slightly smaller than the outer diameter of the fixed-side lens insert 8 (the outer diameter of the fixed-side sleeve 7 in the illustrated configuration). Clearance is required, and when the insert 8 is screwed to the fixed-side mold plate 6 with the mounting bolt 9, it is inevitable that the insert 8 is biased.

In particular, the movable side lens insert 17 is slidably fitted, and is the same as the movable side sleeve 16 and the insert 1.
The clearance between 7 is required to be designed large. Therefore, the misalignment between the two inserts 8 and 17 appears as a misalignment of the optical axis of the molded lens. Also,
Since a processing error also occurs in the processing of the molding surface of the inserts 8 and 17, this also causes a deviation of the optical axis of the molded lens. However, these factors are difficult to avoid due to the mold structure.

Therefore, in the present situation, when the deviation of the optical axis of the molded lens due to the above factors is outside the allowable range of the standard,
The mold assembly such as disassembling the mold and adjusting while rotating the inserts 8 and 17 must be repeatedly performed until the molding satisfying this can be performed, which is a very troublesome and complicated work. In addition to the above-mentioned demands, it takes time to disassemble and assemble the mold, which lowers the productivity of plastic parts such as plastic lenses.

The present invention was developed in view of the above problems in the conventional injection molding die, and in the assembled state of the injection molding die, the insert having the molding surface of the plastic part is rotated. It is an object of the present invention to provide an injection molding die capable of adjusting a core deviation between the molding surfaces of both inserts of a molded product by moving.

In order to achieve the above object, the invention of claim 1 is an injection molding die for molding a plastic component such as a plastic lens by a pair of molding surfaces of a stationary insert and a movable insert. It has a slide member for fixing the side insert and sliding out the movable insert, a rotation mechanism for rotating the slide member, and a rotation restricting mechanism for restricting rotation of the slide member. Characterize. Further, the invention of claim 2 is characterized in that the rotation restricting mechanism of the slide member comprises a plurality of engagement holes provided in the slide member and an engagement member which engages with the engagement holes. According to a third aspect of the present invention, the rotation restricting mechanism for the slide member is provided on an upper surface or a bottom surface of a flange portion sandwiched between a protruding plate upper plate and a protruding plate lower plate, which are holding members for the sliding member. A plurality of engaging holes arranged at appropriate intervals in the circumferential direction, and an engaging member provided on the upper plate or the lower plate of the protruding plate so as to engage with the engaging holes. Characterize. Further, the invention of claim 4 is characterized in that the engaging member is a screw member. Further, the invention of claim 5 is characterized in that the engaging member is a ball plunger. According to the first aspect of the invention, when adjusting the misalignment between the fixed-side insert and the movable-side insert, the slide member having the fixed movable-side insert is fixed by the rotating mechanism while the injection molding die body is still assembled. While rotating, the rotation regulating mechanism regulates the rotation of the slide member after the adjustment. . In the invention of claim 2, the engaging portion of the rotating tool is engaged with the engaging hole or the engaging protrusion of the rotating mechanism, and the slide member is rotated by the rotating tool. In the invention of claims 3 to 5, the engaging member is engaged with the engaging hole provided in the slide member to restrict the rotation of the slide member.

According to the injection molding die having the above structure of the present invention, in the state where the die is incorporated, the movable side insert is rotated while rotating the slide member through the rotation mechanism of the slide member. By moving the core, it is possible to adjust the misalignment between the stationary insert and the stationary insert.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 of the present invention will be described below with reference to FIGS. First, FIG. 1 is a cross-sectional view of an injection molding die according to Embodiment 1 of the present invention, FIG. 2 is a partial perspective view of an ejection rod, FIG. 3 is a partial cross-sectional view of a flange portion of the ejection rod, and FIG. FIG. 5 is a perspective view of a tool for rotating the protruding rod, and FIGS. 5 and 6 are explanatory views showing a method of adjusting the center misalignment between the fixed-side insert and the movable-side insert. Well, Figure 1
In, the injection molding die 30 in the present embodiment is
It has the same basic structure as the injection molding die 1 shown in FIG.

That is, the injection molding die 30 shown in FIG.
It is composed of a fixed mold part 32 and a movable mold part 33, and the two mold parts 32, 33 are bonded to each other (mold matching surface) 34.
Is fixedly joined and separated.

One fixed mold part 32 is composed of a fixed side mold plate (core plate) 35 and a fixed side mounting plate 36 for mounting the fixed side mold plate 35, and the core plate 35 has a predetermined shape of a plastic lens as an injection molded product. A fixed side lens insert 38 having a lens molding surface which is reversed is fitted, the fixed side lens insert 38 is fixed by a mounting bolt 39, and a taper bush 40 is attached.

Further, the core plate 35 is provided at its center with a spool 41 which is a runner, a runner 42, and a molding surface of the movable side lens insert which is paired with a molding surface of the fixed side lens insert 38. Gate 4 with cavity 43
4 are provided.

The structure of the other movable mold part 33 is as follows. The mounting plate 46 that constitutes the movable mold part 33 fixes the receiving plate 48 via the spacer block 50, and
Reference numeral 8 fixes a movable side mold plate (cavity plate) 45. The cavity plate 45 is fitted with the taper push 40, and a taper guide 54 for positioning the core plate 35 with respect to the cavity plate 45.
Is installed.

An ejector pin 56 for projecting the spool 41 is slidably provided in a slide hole 58 provided at the center of the cavity plate 45, and a rear end 56b of the ejector pin 56 is a spacer. It is sandwiched and held by a protruding plate upper plate 51 and a lower plate 52 which are arranged between the receiving plate 48 formed by the block 50 and the mounting plate 46. In addition, a movable side lens insert 47 having a molding surface that makes a pair with the molding surface of the fixed side lens insert 38 is inserted into the insertion hole 91 formed in the cavity plate 45. The movable insert 47 is attached to the upper end 53a of the protruding rod 53 by the mounting bolt 59.
It is fixed to.

The protrusion rod 53 is a slide member for rotating the movable side lens insert 47 and sliding the movable side lens insert 47 so as to protrude toward the joint surface 34. A flange portion 61 is provided at the rear end 53b of the protrusion rod 53 so as to be rotatable within a holding portion 62 provided on the protrusion plate upper plate 51. , And is sandwiched by the lower plate 52. In addition, the cavity plate 45, the receiving plate 48, and the protruding plate upper plate 51 are provided with relief portions so that the distal end portion 53a located above the flange portion 61 and the movable side lens insert 47 can slide and rotate. Openings 80, 81, 82 are provided.

Next, the rotating mechanism of the protruding rod 53 which is a slide member of the movable insert 47 in the movable mold 33 will be described. The rotating mechanism is composed of engaging holes 60 arranged on the outer circumference of the protruding rod 53, and the engaging holes 60 are spaced at intervals of 30 degrees in the circumferential direction of the outer circumference of the protruding rod 53, as shown in FIG. It is evenly arranged at 12 places. The engagement hole 60 is a portion for engaging the rotating tool 70 shown in FIG. 4 when the protruding rod 53 is rotated. As shown in FIG.
One sandwiching piece 73 and a curved portion provided at the tip of each sandwiching piece 73 are integrally formed by an elastic member (for example, an elastic plate material). The curved portion 74 is the protruding rod 5
While having a shape corresponding to the outer diameter of 3 (see FIG. 2),
At the end of the curved portion 74, an engaging claw 71, which is an engaging portion corresponding to the engaging hole (see FIG. 2) of the protruding rod 53, is provided in a protruding manner.

Next, the rotation restricting mechanism of the protruding rod 53 which is a slide member of the movable insert 47 in the movable mold part 33 shown in FIG. 1 will be described. The rotation restricting mechanism includes a bottom portion 63 of the flange portion 61 of the protruding rod 53.
And the screw member 64 that is an engaging member that engages with the engaging hole 65. Engagement hole 6
5 are arranged at 12 places at intervals of 30 degrees in the circumferential direction of the flange 61, and the screw members 64 that engage with these engaging holes 65 are provided on the lower plate 52 of the protruding plate. It is screwed into the screw hole 66. An opening 67 is provided behind the screw hole 66, that is, at a position corresponding to the screw member 64 in the mounting plate 46. A tool such as a screwdriver is inserted through the opening 67 to tighten or loosen the screw member 64. By doing so, the rotation of the protrusion rod 53 is restricted and the restriction is released.

Specifically, the screw member 64 is tightened and the engaging hole 65 and the screw member 64 are engaged with each other to restrict the rotation of the protrusion rod 53, and the screw member 64 is loosened to engage with the engaging hole. By releasing the engagement between the screw member 64 and the screw member 64, the regulation of the rotation of the protruding rod 53 is released.

In the above structure, in the rotating mechanism of the ejecting rod 53, with respect to the engaging hole 60 disposed on the outer periphery of the ejecting rod 53, the rotating operation of the ejecting rod 53 by the rotating tool 70 is performed. The engaging hole 60 is formed for the purpose, and its configuration is modified depending on the type of the turning tool used for turning the engaging hole 60.

For example, an engaging hole (not shown) is provided in the curved portion 74 of the sandwiching piece 73 of the turning tool 70, and an engaging projection engaging with the engaging hole of the tool is provided with the engaging rod 5.
It can be carried out by disposing it on the outer periphery of 3 instead of the engaging hole 60.

Further, in the structure of the rotating mechanism and the rotating restricting mechanism of the protruding rod 53, the protruding rod 5 is provided.
Regarding the disposition state of the engagement holes 65 on the bottom surface 63 of the flange portion 61 of the engagement hole 60 on the outer periphery of No. 3, it is arranged at intervals of 30 degrees in the circumferential direction. It is not limited.

That is, the rotating operation of the ejecting rod 53 by the rotating tool 70 must be carried out within a range that does not cause any trouble in view of the entire structure of the injection molding die 30, and Therefore, there may be a case where the angle at which the protruding rod 53 can be rotated by one rotation operation is restricted, so that it is desirable to implement the structure with the optimum configuration under the circumstances.

Therefore, the structure of the first embodiment is 3
Since the case is shown in which the protrusion rods 53 are arranged at every 0 degrees, the protrusion rod 53 can be moved to either the left or right direction by one rotation operation.
It can be rotated by 0 degree, but it is of course possible to implement this by arranging at every fine angle of 30 degrees or less. The engaging hole 60 provided on the outer periphery of the protruding rod 53 has a configuration for the turning operation by the tool 70 as described above.
A configuration corresponding to the disposition state of the engagement holes 65 of the screw member 64 is not necessarily required, and the number of the engagement holes 60 may be configured to correspond to the configuration of the tool 70.

Now, the first embodiment having the above configuration
The injection molding die 30 is placed on an injection molding machine (not shown), and a plastic lens is molded by the injection molding die 30. The misalignment between the fixed lens insert 38 and the movable lens insert 47 is measured from the molded plastic lens molded product.

Now, suppose that the measurement result is as shown in FIG. In FIG. 5, circumscribing circles 90 and 91 are fixed side lens inserts 38 and movable side lens inserts 4 opened in the core plate 35 and the cavity plate 45.
7 shows a circle corresponding to the insertion holes 90 and 91 and a circle 3
Reference numerals 8 and 47 denote circles corresponding to the outer diameters of the shafts a and b of the double inserts 38 and 47.

Of the circles in the figure, for the sake of explanation, the circles 90, 91 of the insertion holes 90, 91 are the same circle, and the circles 38, 47 of the outer diameters of both the inserts 38, 47 are shown small.
Both are from the direction of the arrow in FIG. Therefore, FIG.
In order to adjust the misalignment between the shaft centers a and b of both the inserts 38 and 47, the injection molding die 30 is once lowered from the injection molding machine, and the adjustment member is opened in the mounting plate 46. The screw member 64 is once warmed through the portion 67, and the screw member 64 is ejected so that the bottom surface 6 of the flange portion 61 of the rod 53
The engagement with the engagement hole 65 provided in No. 3 is released. When adjusting the core misalignment, the screw member 64 is rotated when the injection molding die 30 is opened and the ejection plates 51 and 52 are in a state of protruding toward the joint surface 34 side.
If a tool such as a screwdriver can be inserted between the protruding plate 52 and the mounting plate 46 to rotate the screw member 64, and the rotating tool 70 can rotate the protruding rod 53, It is not necessary to remove the injection mold 30 from the injection molding machine. Therefore, when it is not necessary to lower the injection molding die when adjusting the misalignment, it is not necessary to provide the opening 67.

After that, the turning tool 70 shown in FIG. 4 is inserted from the space formed between the receiving plate 48 and the protruding plate 51, and the curved portion 74 at the tip of both the clamping pieces 73 is fitted on the outer periphery of the protruding rod 53. , 74, and the engaging claws 71, 71 of the curved portions 74, 74 are engaged with the engaging holes 60 provided on the outer circumference of the protruding rod 53.

In this state, by holding the turning tool 70 and turning it in either the left or right direction,
At the same time that the protruding rod 53 can be rotated,
The movable side lens insert 47 connected to the protrusion rod 53 can be rotated.

After the rotation of the movable lens insert 47 is adjusted by the above-mentioned operation by an angle corresponding to the amount of misalignment between the inserts 38 and 47, which is obtained by the measurement of the molded product. Again, while tightening the screw member 64, the screw member 64 is engaged with the engagement hole 65 of the flange portion 61 to prevent the positional displacement due to the rotation of the protruding rod 53, and the setting is completed.

Therefore, the molding by the normal injection molding is performed again, and the misalignment of the molded lens is measured. Then, for example, after confirming that the displacement of the axial centers of both the inserts 38, 47 in the state of FIG. 6 is adjusted within the allowable range by the rotating operation of the movable side lens insert 47,
The original injection molding by the injection molding die 30 is performed.

In the turning operation by the tool 70 described above, when the turning angle is turned by 30 degrees, the engaging hole 65 provided on the bottom surface 63 of the flange portion 61 is rotated by 30 degrees. Due to the arrangement, the engagement is engaged with the engagement hole 65 provided adjacent to the left or right rotation direction, and the rotation is temporarily stopped.

By repeating the turning operation by the tool 70 again, the turning adjustment of the movable side lens insert 47 can be performed every 30 degrees.

[Effect] As is clear from the above description, according to the injection molding die 30 of the first embodiment, it is possible to perform the molding with a simple structure without significantly modifying the conventional structure. The movable-side lens insert 47 can be movably adjusted by rotating the protruding rod 53, and the misalignment between the fixed-side lens inserts 38 can be adjusted.

Further, the movable side lens insert 47 can be rotated by every 30 degrees by the rotation operation of the protrusion rod 53, and the accurate alignment required for the misalignment adjustment can be realized. Further, the arrangement intervals of the engagement holes 65 arranged on the bottom surface 63 of the flange portion 61 of the protruding rod 53 are set to 3 mm.
By making it finer than 0 degree, it is possible to perform even more accurate alignment adjustment.

In this embodiment, the screw member 64 is screwed to the lower plate 52 of the protruding plate. However, the flange portion 61 of the protruding rod 53 is enlarged, and the flange portion 61 is engaged with the upper plate 51 side of the protruding plate. The screw member 64 may be screwed to the upper plate 51 of the protruding plate while the fitting hole 65 is provided. In this case, it is not necessary to lower the injection molding die 30 from the injection molding machine for adjusting the misalignment, and it is not necessary to provide the opening 67.

[0042]

Second Embodiment FIG. 7 is a sectional view of the essential parts showing a second embodiment of the injection molding die of the present invention. The second embodiment is a modification of the configuration of the rotation restricting mechanism for the protruding rod 53 in the first embodiment shown in FIG. That is, as shown in FIG. 7, a rotation regulating mechanism of the protrusion rod 53 is configured by screwing a ball plunger 76 as an engaging member into the screw hole 66 of the protrusion plate upper plate 51.

When the ball plunger 76 screwed into the screw hole 66 is engaged with the engaging hole 65 on the bottom surface 63 of the flange portion 61 of the protruding rod 53, a pressing force that pushes up the protruding rod 53 is generated. Eject rod 53 without any external force.
Is screwed into the screw hole 66 while adjusting so as not to rotate. The other structure is the same as that of the first embodiment, and thus detailed illustration and detailed description thereof will be omitted.

[Operation] According to the injection molding die 30 of the second embodiment, the misalignment between the fixed lens insert 38 and the movable lens insert 47 is adjusted by the injection mold 30 of the first embodiment.
In the case of the injection-molding die 30 of the first embodiment, it is possible to carry out the same method as the above-mentioned method, and it is necessary to loosen the screw member 64 that constitutes the rotation restricting mechanism of the ejection rod 53. Therefore, it was necessary to lower the mold from the molding mechanism. However, in the case of the second embodiment, this is not necessary, and due to the effect of the ball plunge 76, the ejection rod 53 is immediately moved through the rotation mechanism. It is possible to rotate it.

[Effect] According to the second embodiment, the same effect as that of the first embodiment can be obtained, and in addition, in the case of the first embodiment, the work of rotating the protruding rod 53 is performed. After loosening or adjusting the screw member 64 as shown in
The work of tightening this can be omitted, and
The work of lowering the mold itself from the molding machine, which is required when adjusting the screw member 64 in the first embodiment, can be omitted.

[0046]

Third Embodiment FIGS. 8 and 9 show a third embodiment of the present invention. FIG. 8 is a cross-sectional view of a main portion, and FIG. 9 is a flange portion which constitutes a rotation restricting mechanism of a protruding rod 53. 61
FIG. 3 is an explanatory view showing a disposition state of engagement holes and a disposition state of ball plungers in FIG.

In the third embodiment of the present invention, the structure of the rotation restricting mechanism of the ejection rod 53 in the injection molding die 30 of the first embodiment is redesigned.
That is, a clearance 84 (for example, 0..0) that can act the movable mechanism and the rotation restricting mechanism of the protrusion rod 53 is provided between the upper surface 78 of the flange portion 61 of the protrusion rod 53 and the top surface 79 of the holding portion 62 of the protrusion plate upper plate 51. 1 mm) and a plurality of engaging holes 85 are arranged at intervals of 30 degrees in the circumferential direction on the upper surface of the flange portion 61, and the top plate portion of the holding portion 62 of the protruding plate upper plate 51 is provided. 86
As shown in FIG. 9, one of the screw holes 87 opened in the
The other screw hole 89 is opened at a position of 165 degrees in the circumferential direction with respect to both of the screw holes 87 and 89, and the second embodiment is formed.
The ball plunger 88 similar to the ball plunger 76 in FIG.

In the third embodiment, the two ball plungers 88 are arranged, but one ball plunger 88 for one screw hole 87 is used, or the ball plunger 88 is replaced with this embodiment. It is of course possible to implement the screw member 64 in the first embodiment. That is, the rotation restricting mechanism of the protruding rod 53 in the first embodiment is an embodiment in which the engagement hole 65 is provided in the bottom surface 63 of the flange portion 61, but in the above-described embodiment, the flange portion 61 is provided. In this embodiment, the engaging hole 85 is provided on the upper surface 78 of the.

[Operation] Embodiment 3 constructed as described above
According to the injection molding die 30, the fixed side lens insert 38 and the movable side lens insert 4 are operated by the same operation as in the second embodiment.
It is possible to perform the misalignment adjustment of the shaft center of No. 7.

[Effect] According to the injection molding die 30 having the configuration of the third embodiment, the same effects as those of the first and second embodiments can be obtained, and the rotation restricting mechanism of the ejection rod 53 can be used as the ejection rod. The upper surface 78 of the flange portion 61 of 53
Since the engaging hole 85 is provided in the screw hole and the ball plunger 88 is screwed into the screw hole 87 provided in the top plate portion 86 of the protruding plate upper plate 51, it is required in the first and second embodiments. The structure in which the opening 67 is opened in the mounting plate 46 can be omitted if unnecessary.

In the structure of the ball plunger 88, in addition to the one ball plunger 88, the other ball plunger 88 is located at the position of one of the screw holes 87.
Since it is configured to be screwed into the screw hole 89 opened at the position of 65 degrees, compared with the configuration of one ball plunger 76 in the case of the second embodiment, the ball plunger 8
The pushing force by 8 is well balanced, and the protruding rod 53
It is possible to obtain the effect of smoothly performing the rotation restriction action of.

Particularly, since the other ball plunger 88 with respect to the one ball plunger 88 is disposed at the position of 65 degrees, the one ball plunger 88 is engaged with the engagement hole 85, When the protrusion rod 53 is rotated in either the left or right direction by the rotation mechanism, the rotation is temporarily stopped when the other ball plunger 88 is engaged with the engagement hole 85. This has the effect of making the movable angle finer than that of the rotation restricting mechanism using one ball plunger 76. In the case of the third embodiment, the engaging hole 85 is formed every 30 degrees. Since it is arranged in the above-mentioned manner, it is possible to obtain the rotation restricting action of every 15 degrees.

Further, in the case of the third embodiment, a clearance 84 is provided between the upper surface 78 of the flange portion 61 of the protruding rod 53 and the top surface 79 of the holding portion 62 of the protruding plate upper plate 51, so Protruding rod 5 by moving mechanism
The rotation operation of 3 can be smoothly performed.

In addition, as an embodiment of the rotation restricting mechanism of the protruding rod 53 in the above-mentioned first to third embodiments,
A flange 61 is provided on the lower part of the protruding rod 53,
The structure in which this is rotatably held by the holding portion 62 of the protruding plate upper plate 51 has been described. However, the lower portion of the protruding rod 53 is provided between the protruding plate upper plate 51 and the lower plate 52 without providing the flange portion 61. Between the bottom surface or the outer peripheral surface of the lower part of the protruding rod 53 and the holding part surfaces of the upper plate 51 and the lower plate 52 of the protruding plate, which are opposed to the engaging hole 65 and the screw. By disposing the member 64 and the ball plunger 76, it is possible to implement the structure of an injection molding die that can obtain the same operation and effect as those of the first to third embodiments.

Regarding the injection-molded product in the injection-molding die 30, the plastic lens molding has been explained, but the injection molding used for molding optical parts other than the plastic lens or other plastic parts. It can be carried out while obtaining the same operation and effect as the mold.

However, the movable side lens insert 47 and the slide member (protruding rod 53 in the above embodiments) connected to the movable side insert required for molding the plastic parts to replace the movable side lens insert 47 are inserted through the rotating mechanism. The movable-side insert is suitable for a cylindrical structure because the movable-side insert is adjusted relative to the fixed-side insert and the movable-side insert while rotating. However, it cannot be said that this is not necessarily applicable to other configurations as well, and the present invention can be implemented in a configuration in which rotation is possible.

Further, it is possible to maintain the movable side insert itself in a cylindrical shape, and to process the molding surface of the insert with a molding surface necessary for molding a desired plastic part. The shape of the plastic part to be molded is not limited to the circular shape.

[0058]

According to the first to fifth aspects of the present invention,
By adding a simple configuration to the conventional injection mold, the core misalignment between the fixed-side insert and the movable-side insert in the molding of plastic parts such as plastic lenses can be adjusted with the mold incorporated. it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an injection molding die of the present invention.

FIG. 2 is a perspective view of a part of the protruding rod.

FIG. 3 is a partial sectional view of the flange portion.

FIG. 4 is a perspective view of the turning tool.

FIG. 5 is an explanatory view of a method of adjusting the fixed side lens insert and the movable side lens insert.

FIG. 6 is an explanatory diagram of a method for adjusting the fixed side lens insert and the movable side lens insert.

FIG. 7 is a sectional view of an essential part showing a second embodiment of an injection molding die of the present invention.

FIG. 8 is a sectional view of an essential part showing a third embodiment of an injection molding die of the present invention.

FIG. 9 is a plan view of the rotation restricting mechanism.

FIG. 10 is a sectional view of a conventional injection molding die.

[Explanation of symbols]

 30 injection molding die 38 fixed side lens insert 47 movable side lens insert 51 protruding plate upper plate 52 protruding plate lower plate 53 protruding rod 60,65 engaging hole 61 flange portion 62 holding portion 63 bottom surface 64 screw member 66,89 Screw hole 67 Opening part 70 Rotating tool 71 Engaging claw 72 Tool body 73 Clamping piece 74 Curved part 76, 88 Ball plunger 78 Upper surface 79 Top surface 84 Clearance 85 Engaging hole 86 Top plate part 87 Screw hole

Claims (5)

[Claims] 1. An injection molding die for molding a plastic component such as a plastic lens by a pair of molding surfaces of a fixed side insert and a movable side insert, wherein the movable side insert is fixed and the movable side insert is fixed. An injection-molding die, comprising: a slide member for sliding and protruding, a rotation mechanism for rotating the slide member, and a rotation restriction mechanism for restricting rotation of the slide member. 2. The rotation restricting mechanism of the slide member is composed of a plurality of engagement holes provided in the slide member and an engagement member which engages with the engagement holes. Injection mold. 3. The rotation restricting mechanism for the slide member is appropriately arranged in a circumferential direction of an upper or bottom surface of a flange portion sandwiched between a protruding plate upper plate and a protruding plate lower plate, which are holding members for the sliding member. And a plurality of engaging holes arranged at intervals, and an engaging member provided on the upper plate or the lower plate of the protruding plate so as to engage with the engaging holes. Item 1. An injection mold according to item 1. 4. The injection molding die according to claim 2, wherein the engaging member is a screw member. 5. The injection molding die according to claim 3, wherein the engagement member is a ball plunger.