JP3365788B2 - Injection mold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die for molding a thick molded product with high accuracy.

[0002]

2. Description of the Related Art When a thick product such as a plastic lens is injection molded, there is a problem that the molding cycle time becomes long because cooling is required to prevent sink marks and deformation. As a method for solving this problem, there has been heretofore known JP-A-64-
The injection molding method described in Japanese Patent No. 36421 is known. In this conventional injection molding method, the cavity unit is clamped by a U-shaped mold clamping member, the cavity unit that has been clamped is heated to a temperature equal to or higher than the glass transition temperature to inject the molten resin, and then the gate is closed. The mold is gradually cooled to the heat deformation temperature, and then, with the mold clamping force of the cavity unit held by itself, the mold is released from the mold clamping mechanism of the molding apparatus to cool the cavity unit independently.

[0003]

However, in the prior art, when a force in the direction of opening the parting line surface is applied by the resin internal pressure, the mold clamping member is elastically deformed, and this elastic deformation causes the parting line surface to be deformed by that amount. It had the drawback that it could not open and hold the mold clamping force by itself. On the other hand, in order to generate a mold clamping force against the resin internal pressure, a large and powerful power source and a mold clamping member are required, which causes a problem that the entire apparatus is large and complicated. In addition, attachment / detachment of the U-shaped mold clamping member needs to be performed manually or by using another actuator, which makes automation of this attachment / detachment difficult. That is, the conventional injection molding method aims at shortening the molding cycle time by temporarily isolating the cavity unit from the mold clamping mechanism of the molding machine in the cooling step and setting another cavity unit in the meantime and injecting it. However, as described above, if the cavity unit becomes large or cannot be automated, it takes time to move, replace, and attach / detach the cavity unit, which limits the shortening of the molding cycle time.

The present invention has been made in view of the above problems, and it is possible to reliably hold the mold clamping force self-holding even if it is small, and to automate the self-holding and release of the mold clamping force of the cavity unit. It is an object of the present invention to provide an injection mold that can be manufactured.

[0005]

In order to achieve the above object, an injection mold of the present invention has a mounting member to which a pair of cavity units forming a cavity are removably mounted, and a hook portion at the tip. A fixing arm attached to one of the cavity units, and a rotating body rotatably attached to the other cavity unit, in which an engaging portion with which a hook portion of the fixing arm engages in a disengageable manner is formed, An elastic member that urges the pair of cavity units in the mold clamping direction, and an elastic member that is attached to the one cavity unit and that engages with the rotating body in conjunction with the mold clamping operation to lock the hook portion of the fixing arm and the rotating body. A first switching arm that rotates the rotating body so that the engaging portion engages with the engaging portion;
A second rotating member which is attached to the attaching member and which engages with the rotating member in conjunction with the mold opening operation to rotate the rotating member so as to remove the engagement between the hook portion of the fixing arm and the engaging portion of the rotating member; A switching arm is provided, and the pair of cavity units are integrally attached to and detached from the mounting member by self-holding the mold clamping force by the engagement of the fixing arm and the rotating body. .

Further, according to the present invention, a mounting member to which a pair of cavity units forming a cavity is detachably mounted, a switching arm slidably mounted in the one cavity unit in the mold opening direction, and a tip end thereof. An attachment / detachment arm having a hook piece attached to the other cavity unit, and an engagement portion with which the hook piece of the attachment / detachment arm engages in a detachable manner are formed and rotatably attached to the attachment member. A rotating body for attachment and detachment, wherein the switching arm rotates the attaching and detaching rotary body in conjunction with mold clamping and mold opening to engage and disengage the attaching and detaching rotary body, and a pair of cavity units for the mounting member. It is also characterized by attaching and detaching.

[0007]

In the above structure, when the mold clamping operation is performed, the first switching arm rotates the rotating body to engage the engaging portion of the rotating body with the hook portion of the fixing arm. It is in a close contact state in which the mold clamping force is self-maintained, and in this state it is attached to and detached from the mounting member. At this time, since the biasing force of the elastic member acts, the mold clamping force can be surely held by itself even if the size is small. On the other hand, during the mold opening operation, the second switching arm rotates the rotating body to release the engagement between the engaging portion of the rotating body and the hook portion of the fixing arm.
The pair of cavity units are separated to take out the molded product. Therefore, the self-holding and releasing of the mold clamping force can be automatically performed in conjunction with the mold clamping operation and the mold opening operation.

In the structure having the detachable arm and the detachable rotating body which are engaged with each other, the switching arm rotates the detachable rotating body in association with the mold clamping and the mold opening, whereby the detachable arm and the detachable arm are detached. Since it is engaged with and disengaged from the rotating body for use, it is possible to automate the attachment and detachment of the pair of cavity units to the attachment member in accordance with the mold clamping and mold opening timing.

[0009]

Embodiment 1 FIGS. 1 to 6 show Embodiment 1 of the present invention. In these figures, the movable side cavity unit 1
By closely contacting the fixed side mold plate 2 with each other, a molding cavity 5 is formed. The fixed side mold plate 2 and the fixed side receiving plate 3 constitute a fixed mold cavity unit 47, and the fixed mold cavity unit 47 and the movable side cavity unit 1 form a pair of cavity units. Four
Is a fixed side mounting plate as a mounting member to which the fixed side cavity unit 47 is detachably mounted.

A shaft body 8 is provided on the outer surface of the stationary side receiving plate 3 which is one of the components of the stationary side cavity unit 47, and a rotating body 9 is rotatably attached to the shaft body 8. Engagement portions 16 are formed on the outer peripheral side of the rotating body 9 at predetermined equal intervals, and a slit portion into which a fixing arm 10 described later enters between the engagement portions 16 and 16. 6 is formed. Engaging teeth 7 are formed on the lower surface of the rotating body 9 by cutting. For such a rotating body 9,
The movable side cavity unit 1 is provided with a fixing arm 10 and a first switching arm 14, and the fixed side mounting plate 4 which is a mounting member is provided with a second switching arm 18.

The fixing arm 10 has a base end fixed to the outer surface of the movable-side cavity unit 1 and extends linearly in the direction of the rotating body 9. The distal end of the fixing arm 10 is provided with an engaging portion 16 of the rotating body 9. A hook portion 11 is formed so as to be engageable and disengageable. The fixing arm 10 has a width smaller than that of the slit portion 6 of the rotating body 9 and can enter the rotating body 9 through the slit portion 6. The hook portion 11 of the fixing arm 10 is engaged with the engaging portion 16 of the rotating body 9 so that the movable side cavity unit 1 and the fixed side cavity unit 47 are kept in close contact with each other. A pair of cavity units consisting of and 47 self-holds the mold clamping force.

The first switching arm 14 is inserted into the receiving groove 12 formed on the outer surface of the movable side cavity unit 1 and is slidable in the mold opening direction. This first
The switching arm 14 is provided with a hook claw 15 that engages with the engaging teeth 7 of the rotary plate 9, and the elastic means 13 formed of a spring.
Is provided at the base end. Such first switching arm 14
Acts to rotate the rotating body 9 during mold clamping.

The second switching arm 18 provided on the fixed side mounting plate 4 is structurally the same as the first switching arm 14. That is, the second switching arm 18 is provided with the hook claw 19 at the tip end portion and the elastic means 17 at the base end portion, and the receiving groove 3 formed on the outer surface of the fixed side mounting plate 4.
6 is slidably inserted in The second switching arm 18 acts so as to rotate the rotating body when the mold is opened.

In the illustrated example, reference numeral 20 denotes an elastic member such as a spring inserted between the fixed-side mold plate 2 and the fixed-side receiving plate 3, and the fixed-side mold plate 2 is in close contact with the movable-side cavity unit 1. Press. As a result, the pair of cavity units including the movable cavity unit 1 and the fixed cavity unit 47 are biased in the mold clamping direction. Further, by inserting the elastic member 20, the fixed mold plate 2 and the fixed-side receiving plate 3 are always urged in the separating direction, which causes the mold clamping force of the injection molding apparatus to act. A gap 21 is formed between them.

Next, the operation of this embodiment will be described. Figure 1
The mold open state before injection molding is shown, and when the platen (not shown) of the injection molding device is closed in this state to advance the movable side cavity unit 1, the hook portion 11 of the fixing arm 10 causes the rotating body 9 to move. Enter the slit portion 6. Almost at the same time as this entry, the hook claw 15 at the tip of the first switching arm 14 contacts the engaging tooth 7 of the rotating body 9. When the platen is closed further, the parting line surface (PL surface) 22
Closes. At this time, the hook claws 15 press the engaging teeth 7, but the hook 11 of the fixing arm 10 is in contact with the side surface of the engaging portion 16 of the rotating body 9 to prevent the rotating body 9 from rotating. , The hook claw 15 cannot rotate. Therefore, the first switching arm 14 slides so as to contract the elastic means 13 (see FIG. 2). When the platen is further closed and the mold clamping force is applied, the fixed-side mold plate 2 is pressed, so that the gap 21 between the fixed-side mold plate 2 and the fixed-side receiving plate 3 is closed, whereby the side surface of the engaging portion 16 is formed. For hook 11
Contact is lost. Therefore, the rotating body 9 is rotated by the restoring force of the elastic means 13, whereby the engaging portion 16 of the rotating body 9 is rotated.
Comes to face the hook portion 11 of the fixing arm 10 (see FIG. 3). In this state, the molten resin is injected into the cavity 5. When the holding pressure after the injection is completed and the resin pressure in the cavity 5 becomes low to some extent, the mold clamping of the injection molding device is released, the platen is opened, and the movable side cavity unit 1 is retracted. The hook portion 11 engages with the engaging portion 16 of the rotating body 9. Further, since the urging force of the elastic member 20 having a compressive force is applied to the PL surface 22, P
The platen can be opened without opening the L surface 22 (see FIG. 4).

The fixing arm 10 and the rotating body 9 as described above
By engaging with, the pair of cavity units 1 and 47 will be in a state of self-holding the mold clamping force, and in this state, they are moved from the injection molding position to another position and cooled. By this cooling, the thick-walled molded product is in a highly accurate molded state without sinking or deformation. Then, during this cooling, another pair of cavity units can be set at a position for injection molding and injection molding can be performed in the same manner. After that, the pair of cavity units, which have been cooled, are set to the positions for injection molding again and the platen is closed. Thereby, the second switching arm 1
The hook claws 19 at the tips of the eight abut against the engaging teeth of the rotating body 9 to press them. However, since the hook portion 11 of the fixing arm 10 is engaged with the engaging portion 16 of the rotating body 9, the rotating body 9 does not rotate, and therefore the second switching arm 18 includes the elastic means 17. Slide to compress (see Figure 5). Further, when the platen is closed and a mold clamping force is applied, the fixed mold plate 2 is pressed and the gap 21 is closed. As a result, the engagement between the fixing arm 10 and the rotating body 9 is released, so that the rotating body 9 rotates due to the restoring force of the elastic means 17, and the slit portion 6 of the rotating body 9 causes the hook portion 1 of the fixing arm 10 to rotate.
1 (see FIG. 6). After that, by opening the platen and retracting the movable side cavity unit 1,
Since the PL surface 22 opens, the cooled and solidified molded product can be taken out (see FIG. 1).

In this embodiment, the mold clamping force in the pair of cavity units is self-held by the engagement between the fixing arm 10 and the rotating body 9, and the fixing arm 10 is extended by the resin pressure. Also, since the mold clamping state is maintained by the urging force of the elastic member 20, the PL surface does not open, and the expansion due to the elastic deformation of the fixing arm can be absorbed by the opening amount of the gap 22. Therefore, even if it is small, it can be surely brought into the self-holding state. Also,
Since the cavity unit is self-held and released in conjunction with mold clamping and mold opening, the automation can be performed.

[0018]

Second Embodiment FIGS. 7 to 9 show a second embodiment of the present invention, in which the same elements as in the first embodiment are designated by the same reference numerals. As shown in FIG. 9, the movable side platen 71 and the fixed side platen 72 are arranged to face each other, and the movable side platen 71 is
The movable side mounting plate 39 and the fixed side mounting plate 4 are mounted on the fixed platen 72. The movable-side mounting plate 39 holds the movable-side receiving plate 40, and the mounting plate 39 is provided with a cylinder 41. By driving the cylinder 41, the movable-side receiving plate 40 is orthogonal to the mold opening direction. Move in the direction you want to. In this embodiment, two movable cavity units 1 and 1 each having a fixing arm 10 and a first switching arm 12 are attached to the movable support plate 40.

On the other hand, a fixed side cavity unit 47 consisting of the fixed side cavity unit 2 and the fixed side receiving plate 3 is detachably attached to the fixed side mounting plate 4. Two fixed-side cavity units 47 are arranged corresponding to the movable-side cavity unit 1, and a second fixed-side cavity plate 47 is provided on the outer surface of the fixed-side mounting plate 4 corresponding to the arrangement position of each fixed-side cavity unit 47. A switching arm 18 is attached. A rotating plate 9 is provided on the outer surface of each stationary side receiving plate 3.
Is rotatably attached.

7 and 8 show the details of FIG. 9, in which the movable side cavity unit 91 and the fixed side mold plate 2 are formed with a cavity 5 communicating with the nozzle 24 of the injection molding apparatus. Engagement portions 16 are formed at 90 ° intervals on the outer peripheral portion of the rotary plate 9 attached to the stationary-side receiving plate 3, and slit portions 6 are formed between the engagement portions 16. Notch-shaped engaging teeth 7 are formed on the lower outer peripheral surface of the rotary plate 9 by 45.
Formed at intervals. The fixing arm 10 is fixed to the movable side cavity unit 1 by bolting, and the hook portion 11 at the tip thereof has the slit portion 6 of the rotating body 10.
It is narrower than that. Further, a box 24 having a receiving groove 12 is fixed to the movable side cavity unit 1 by bolting, and a first switching arm 14 having a hook claw 15 at a tip end thereof can slide in the receiving groove 12 of the box 24. Has been inserted into. This first switching arm 14
A spring 25 is provided at the base end portion of and is biased in the mold opening direction. Reference numeral 26 is an elongated hole for restricting the sliding amount of the first switching arm 14, and the pin 27 of the first switching arm 14 is inserted into the elongated hole 26.
Further, the hook claw 15 is rotatable about the shaft portion 30, but since this rotation is limited to clockwise rotation,
A shoulder portion 28 with which the hook claw 15 abuts is formed on the switching arm 14.

A second switching arm 18 having the same structure as the first switching arm 14 is attached to the fixed side mounting plate 4. That is, the second switching arm 18 is slidably inserted into the receiving groove 36 of the box 31, and has the spring 32 at the base end and the hook claw 19 at the tip. In FIG. 8, 33 is a screw part that is screwed into the fixed side cavity unit 2 to adjust the size of the gap formed between the fixed side cavity unit 2 and the fixed side receiving plate 3, and the head is fixed. The adjustment bolt is located inside the side support plate 3. Further, 34 is a protrusion provided on the fixed receiving plate 3 for attaching and detaching the fixed receiving plate 3 to and from the fixed mounting plate 4, and 35 is a ball plunger provided on the protruding portion 34.

Next, the operation of this embodiment will be described. When the platen is closed by an injection molding device (not shown), the hook portion 11 of the fixing arm 10 is inserted into the slit portion 6 of the rotating body 9. Almost at the same time, the hook claw 15 at the tip of the first switching arm 14 contacts the engaging tooth 7 of the rotating body 9,
When the platen is closed further, the PL surface is closed. At this time, the hook claw 15 presses the engaging tooth 7. However, since the hook portion 11 of the fixing arm 10 is caught on the side surface of the engaging portion 16 of the rotating body 9 to prevent the rotating body 9 from rotating, the first switching arm 14 causes the spring 25 to contract. Further, when the platen is closed and a mold clamping force is applied, the gap between the fixed side mold plate 2 and the fixed side receiving plate 3 is closed, so that the hook portion 11 is not caught on the side surface of the engaging portion 16. Therefore, the rotating body 9 rotates 45 ° by the restoring force of the spring 25,
Of the engaging portion 16 faces the hook portion 11. In this state, the molten resin is injected into the cavity 5. After that, when the pressure holding is completed and the resin pressure in the cavity 5 becomes low to some extent, the mold clamping of the injection molding apparatus is released and the platen is opened. At this time, the hook portion 11 engages with the engaging portion 16 of the rotating body 9.
Further, at this time, the elastic member 20 having a compressive force causes the PL
Since a compressive force is applied to the surface, the platen can be opened without opening the PL surface. Then, the paired cavity units retract together with the movable side mounting plate 39 due to the ball plunger 35 coming off. afterwards,
By operating the cylinder 41, the cavity unit in which the mold clamping force is self-maintained is moved from the injection molding position to another position and cooled. During this cooling, another cavity unit can be moved to the injection molding position and injection molded as well.

After the cooling, the cavity unit is moved again to be aligned with the injection molding position, and the platen is closed. As a result, the hook claw 19 at the tip of the second switching arm 18 abuts and presses the engaging teeth 7 of the rotating body 9, but since the hook portion 11 is engaged with the engaging portion 16, the rotating body 9 is It does not rotate and the spring 32 of the second switching arm 18 contracts.
When the platen is closed further, the fixed mold plate 2 and the fixed support plate 3 are fixed.
The gap between them is closed, which allows the hook portion 11 and the engaging portion 1 to
The engagement of 6 is released. Therefore, the rotating body 9 rotates 45 ° by the restoring force of the spring 32, and the slit portion 6 faces the hook portion 11. After that, when the platen is opened, the PL surface opens,
A molded product that has been cooled and solidified can be taken out. At this time, the fixed side cavity unit 47 is attached to the ball plunger 3
It is held by the fixed side mounting plate 4 by 5.

Therefore, also in the second embodiment, as in the first embodiment, the mold clamping force can be self-maintained even if the size is small, and the operation linked with the mold clamping and the mold opening can be performed, and the automation can be realized.

FIG. 10 shows a modification of this embodiment, in which engaging pins 37 are provided on the outer peripheral side of the lower portion of the rotating body 9 at intervals of 45 °. The hooking pawls 15 and 16 of the first and second switching arms 12 and 18 come into contact with the engaging pin 37 to apply a rotational force to the rotating body 9. However, since the engaging pin 37 has a pin shape, its machining is facilitated. There are merits.

11 and 12 show a modification of the rotating body 9. Notches 43 are formed on the bottom surface of the rotating body 9 at 45 ° intervals, and the engaging teeth 44 are formed by the pins 45 in each notch 43.
Is rotatably attached. The pin 45 is shown in FIG.
Is attached to the side wall of the cutout portion 43, and the other end is the engaging tooth 4.
By engaging with the pin projection 44a of No. 4,
Is pressed against the notch portion 43. With such a configuration, the first and second switching arms 12,
When the hook claws 15 and 19 of 18 abut, the engaging teeth 44 can be rotated and retracted. In this case, there is an advantage that the engaging teeth 44 can be easily machined and can be replaced quickly when they are worn.

[0027]

Third Embodiment FIGS. 13 and 14 show a third embodiment of the present invention. In the third embodiment, as shown in FIG. 13, the same structure as the second embodiment is used as a mechanism for self-holding the mold clamping force. Therefore, the same elements as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, in addition to this self-holding mechanism, a pair of cavity unit attachment / detachment mechanisms 80 are provided.

The attachment / detachment mechanism 80 includes an attachment / detachment rotary member 49 provided on the fixed side attachment plate 4 as an attachment member for the pair of cavity units, and an attachment / detachment unit provided on the fixed side template 2 of the fixed side cavity unit 47. The arm 54 and the switching arm 59 provided in the movable cavity unit 1 are provided. The attachment / detachment rotary body 49 is rotatably attached to the outer surface of the fixed side attachment plate 4 by a shaft body 48.
Engagement portions 51 are formed at 90 ° intervals on the outer peripheral side thereof, and slit portions 50 into which the detachable arms 54 enter are formed between the engagement portions 51. In addition, a notch-shaped engaging tooth 52 is formed on the outer periphery of the lower portion of the attaching / detaching rotary body 49.
Formed at intervals. The engaging teeth 52 rotate the attaching / detaching rotary body 49 by 45 ° each time when a switching arm 59 described later comes into contact with the engaging teeth 52. The slit portions 50 are arranged so as to face each other.

The attachment / detachment arm 54 attached to the fixed-side mold plate 2 has a hook piece 53 at its tip end portion, which engages with the engagement portion 51 of the attachment / detachment rotary body 49 in a detachable manner. Further, the tip end portion of the attachment / detachment arm 54 has a width smaller than that of the slit portion 50 of the attachment / detachment rotary body 49.

On the other hand, a box 56 having a receiving groove 55 is fixed to the movable side cavity unit 1 by bolts, and a switching arm 59 is attached to this box 56. The switching arm 59 is inserted into the receiving groove 55 so as to be slidable in the mold opening direction, extends in the direction of the attachment / detachment rotary body 49, and engages with the engaging teeth 52 of the attachment / detachment rotation body 49 at its tip portion. A hook claw 58 is attached. The hook claw 58 is rotatably attached to the tip portion of the switching arm 59, but its rotation direction is regulated clockwise, and in order to perform this regulation, a hook is provided at the tip portion of the switching arm 59. A shoulder portion 62 with which the claw 58 abuts is formed. The hook claws 58 are set so as to contact the engaging teeth 52 of the detachable rotating body 49 in the mold clamped state. Reference numeral 63 denotes a spring provided at a mounting portion of the hook claw 58, and the hook claw 58 serves as the attachment / detachment rotary plate 4.
The engaging teeth 52 of 9 are urged to engage. Further, a spring 57 is provided at the base end portion of the switching arm 59, and a long hole 60 and a pin 61 for limiting the sliding amount of the switching arm 59 are provided.

In the attachment / detachment mechanism 80 having such a configuration, the hook claw 58 of the switching arm 59 is engaged with the engaging teeth 5 of the attachment / detachment rotary member 49 each time the PL surface is opened and closed by the mold clamping and mold opening operations.
Since it abuts on 2, the rotating body 49 is rotated by 45 °. With this rotation, the hook portion 53 of the detachable arm 54 is alternately engaged with the engaging portion 51 of the detachable rotating body 49. Thereby, the fixed side cavity unit 47 can be alternately attached to and detached from the fixed side mounting plate 4,
The ball plunger can be attached and detached more reliably than the ball plunger.

[0032]

As described above, according to the present invention, the amount of expansion due to the elastic deformation of the fixing arm is absorbed as the opening amount of the gap on the other cavity unit side, so that the mold clamping force is self-maintained even if the fixing arm is small. It can be done reliably.
Further, since the attachment / detachment of the pair of cavity units can be automated in association with mold clamping and mold opening, the molding cycle time can be shortened.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention when a mold is opened.

FIG. 2 is a front view showing the operation of the first embodiment.

FIG. 3 is a front view showing the operation of the first embodiment.

FIG. 4 is a front view showing the operation of the first embodiment.

FIG. 5 is a front view showing the operation of the first embodiment.

FIG. 6 is a front view showing the operation of the first embodiment.

FIG. 7 is a front view of a second embodiment of the present invention.

FIG. 8 is a sectional view of a second embodiment.

FIG. 9 is an overall front view of the second embodiment.

FIG. 10 is a front view of a modified example of the second embodiment.

FIG. 11 is a back view of a modified example of the rotating body.

FIG. 12 is a front view of a torsion spring.

FIG. 13 is a front view of Example 3 of the present invention.

14 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 Movable cavity unit 2 Fixed side template 3 Fixed side support plate 4 Fixed side mounting plate 5 cavities 6 slit part 7 engaging teeth 9 rotating body 10 Fixing arm 14 First switching arm 18 Second switching arm 47 Fixed side cavity unit

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Yonekubo 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Inventor Kazuo Saito 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Industry Co., Ltd. (72) Inventor Shozo Nishida 1-1-6 Funakoshi Minami, Aki-ku, Hiroshima City, Hiroshima Prefecture Japan Steel Works, Ltd. Hiroshima Works (56) Reference JP-A-5-337995 (JP , A) JP-A-62-299316 (JP, A) JP-A-61-239926 (JP, A) JP-A-61-237613 (JP, A) Jikkouhei 6-21690 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 45/17 B29C 33/30 B29C 45/26 B29C 45/64

Claims (2)

(57) [Claims] 1. A mounting member to which a pair of cavity units forming a cavity are detachably mounted, a fixing arm having a hook portion at its tip and attached to the one cavity unit, and a hook of the fixing arm. A rotary body having an engaging portion formed to engage with the other cavity unit and rotatably attached to the other cavity unit; an elastic member for urging the pair of cavity units in a mold clamping direction; Mounted on the cavity unit, and rotates the rotating body such that the hook of the fixing arm and the engaging portion of the rotating body engage with the rotating body in conjunction with the mold clamping operation. The rotating body is attached to the arm and the rotating body is attached to the mounting member in conjunction with the mold opening operation so that the engagement between the hook portion of the fixing arm and the engaging portion of the rotating body is removed. And a second switching arm for rotating the rotating body, wherein the pair of cavity units are integrally attached to and detached from the mounting member by self-holding the mold clamping force by the engagement of the fixing arm and the rotating body. A characteristic injection mold. 2. A mounting member to which a pair of cavity units forming a cavity are detachably mounted, a switching arm slidably attached to the one cavity unit in the mold opening direction, and a hook piece at the tip. A detachable arm attached to the other cavity unit, and an attachable / detachable rotary body rotatably attached to the attachment member, in which an engaging portion is formed on which a hook piece of the attach / detach arm is detachably engaged. The switching arm rotates the attachment / detachment rotary body in association with mold clamping and mold opening to engage / disengage the attachment / detachment rotation body and the attachment / detachment arm, and attach / detach the pair of cavity units to / from the attachment member. An injection molding die characterized in that.