JP6878217B2 - Injection molding mold - Google Patents

Description

The present invention relates to an injection molding die.

The injection molding die includes a fixed plate, a movable plate, and an intermediate plate provided between the fixed plate and the movable plate for the purpose of molding a large number of resin molded products at one time. , So-called stack molds, are injection molding dies. In this type of injection molding die, a molding portion (cavity, hereinafter referred to as a first molding portion) is formed between the fixed plate and the intermediate plate, and also between the movable plate and the intermediate plate. A molded portion (hereinafter referred to as a second molded portion) is formed.

Further, the fixed plate is provided with a sprue into which the molten resin is injected from the nozzle of the injection molding machine. Further, a runner that communicates the sprue and each molded portion is formed on the intermediate plate.
Under such a configuration, when the molten resin is injected into the sprue, the molten resin flows into each molded portion at once via the runner. As a result, a large number of resin molded products can be molded at one time.

Japanese Unexamined Patent Publication No. 2000-71288

By the way, the above-mentioned conventional technique is excellent in that a large number of molded parts can be formed and a large number of resin molded products can be molded at one time, but the molten resin can be poured into each molded part. A large injection molding machine is required. Therefore, resin molding is performed by using the first molding part and the second molding part in order so that a small injection molding machine can be used even when a so-called stack mold type injection molding die is used. There are ways to do it. By adopting such a method, it is not necessary to pour the molten resin into both the molding portions of the first molding portion and the second molding portion at once, so that a small injection molding machine can be used.

However, simply using the first molding part and the second molding part in order makes it possible to reduce the size of the injection molding machine, but since the first molding part and the second molding part are not used at the same time, resin molding is performed. There was a problem that the productivity of the plastic was lowered.

Therefore, the present invention has been made in view of the above circumstances, and even when a so-called stack mold type injection molding die is used, a small injection molding machine can be used and a resin. It provides an injection molding die capable of improving molding productivity.

In order to solve the above problems, the injection molding die according to the present invention can be brought into contact with and detached from a fixed plate provided with a sprue into which molten resin is injected from a nozzle of an injection molding machine. An intermediate plate provided in the above, a movable plate arranged on the side opposite to the fixed plate with the intermediate plate sandwiched between the intermediate plates, and a movable plate provided so as to be in contact with and detachable from the intermediate plate, and the fixed plate and the intermediate plate. A first molded portion formed between the two, a second molded portion formed between the movable plate and the intermediate plate, and provided on the intermediate plate to communicate the sprue and the first molded portion. a first runner section into a state, and the runner plate second runner portion is formed to the communicating state between the between the sprue second molding portion, is disposed in the sprue and a position opposed to the intermediate plate, wherein communication with the first runner section, and the cut-off state, the communication state of the second runner section, and a switching mechanism for switching between a cutoff state are alternately provided so as to straddle the fixed plate and said intermediate plate, said switching mechanism When the first runner portion is brought into a communicative state, a first lock mechanism that can maintain the fixed plate and the intermediate plate in a molded state is provided so as to straddle the movable plate and the intermediate plate. When the second runner portion is brought into a communicating state by the switching mechanism, the movable plate and the intermediate plate are provided with a second lock mechanism that can be maintained in a molded state. ..

With this configuration, for example, the second lock mechanism is released, the movable plate and the intermediate plate are opened, and the resin molded product molded by the second molded portion is taken out by the first lock mechanism. The fixed plate and the intermediate plate can be reliably molded, and the molten resin can be poured into the first molded portion. On the other hand, while the first lock mechanism is released, the fixed plate and the intermediate plate are opened, and the resin molded product molded by the first molded portion is taken out, the movable plate and the intermediate plate are securely secured by the second lock mechanism. The mold can be fixed, and the molten resin can be poured into the second molded portion. In this way, since the first molding portion and the second molding portion are used in order, a small injection molding machine can be used even when a so-called stack mold type injection molding die is used. In addition, while resin molding is performed in either the first molded portion or the second molded portion, the work of taking out the resin molded product molded in the other molded portion can be performed. Therefore, the productivity of resin molding can be improved.

In the injection molding die according to the present invention, the first locking mechanism is provided on either one of the fixing plate and the intermediate plate, and the first fixing pin provided on one of the fixing plate and the intermediate plate. The second lock pin is provided with a first lock pin that can be inserted into the first lock hole formed in the first fixing pin and is slidable, and a first drive mechanism that operates the first lock pin. The locking mechanism is a second fixing pin provided on either one of the movable plate and the intermediate plate, and a second fixing pin provided on either the movable plate or the intermediate plate and formed on the second fixing pin. It is characterized by including a second lock pin that can be inserted into a lock hole and can be slidably moved, and a second drive mechanism that operates the second lock pin.

With such a configuration, the configuration of each lock mechanism can be simplified. Therefore, the injection molding die can be miniaturized.

The injection molding die according to the present invention is characterized in that the intermediate plate is provided with the first fixing pin and the second fixing pin.

The intermediate plate is often thinner than the fixed plate or movable plate. Therefore, by providing each fixing pin on the intermediate plate, it is possible to easily provide a drive mechanism on each of the relatively thick fixed plate and movable plate.

According to the present invention, since the first molding portion and the second molding portion are used in order, it is possible to use a small injection molding machine even when a so-called stack mold type injection molding die is used. it can. In addition, while resin molding is performed in either the first molded portion or the second molded portion, the work of taking out the resin molded product molded in the other molded portion can be performed. Therefore, the productivity of resin molding can be improved.

It is a schematic block diagram of the injection molding die in embodiment of this invention. It is explanatory drawing which shows the positional relationship between the 1st molded part and the 2nd molded part in embodiment of this invention. It is a perspective view which looked at the injection molding die from the split surface side of the 2nd runner plate in embodiment of this invention. It is a side view of the runner changer in embodiment of this invention. It is sectional drawing of the 1st lock mechanism in embodiment of this invention. It is a perspective view which shows the 2nd runner plate and the switching mechanism in embodiment of this invention. It is explanatory drawing which shows the state which the molten resin flowed into the 1st molded part of a fixed plate using the 1st cold runner part in embodiment of this invention. It is explanatory drawing which shows the state which the molten resin flowed into the 2nd molded part of the movable plate using the 2nd cold runner part in embodiment of this invention. It is a schematic block diagram of the injection molding die which shows the state which opened the intermediate plate and the movable plate in embodiment of this invention. It is operation explanatory drawing of the switching mechanism in embodiment of this invention. It is explanatory drawing of the molding procedure of the resin molded article in embodiment of this invention, (a)-(d) show each step.

Next, an embodiment of the present invention will be described with reference to the drawings.

(Injection mold)
FIG. 1 is a schematic configuration diagram of an injection molding die 1.
As shown in the figure, the injection molding die 1 has a fixed plate 2, an intermediate plate 3 provided so as to be detachable from the fixed plate 2, and a side opposite to the fixed plate 2 with the intermediate plate 3 interposed therebetween. It is provided with a movable plate 4 which is arranged in the intermediate plate 3 and is provided so as to be detachable from the intermediate plate 3.

The fixing plate 2 is arranged adjacent to a fixed side mounting plate 5 mounted on an injection molding machine (not shown) and an intermediate plate 3, and is fixed in cooperation with the intermediate plate 3 to form a first molding portion 17. It includes a side core plate 6. The fixed-side core plate 6 has a dividing surface 6a that comes into contact with the intermediate plate 3 in a state where the fixing plate 2 and the intermediate plate 3 are in contact with each other, and the divided surface 6a has a fixed-side core that constitutes the first forming portion 17. 10 is provided. Further, in the center of the entire fixed plate 2 including the fixed side mounting plate 5 and the fixed side core plate 6 in the surface direction, the intermediate plate 3 and the movable plate 4 extend along the contact / separation direction (horizontal direction in FIG. 1). A sprue bush 11 to be put out is provided. The sprue bush 11 penetrates the fixing plate 2 in a state where the fixing plate 2 and the intermediate plate 3 are molded, and extends to the center in the thickness direction of the intermediate plate 3. A sprue 7 is provided in such a sprue bush 11.

In the sprue 7, the resin injection port 7a is connected to the nozzle 9 of the injection molding machine via the locating ring 8. On the other hand, the resin discharge port 7b of the sprue 7 extends to the vicinity of the tip of the sprue bush 11. As a result, the molten resin discharged from the injection molding machine (not shown) flows into the intermediate plate 3 via the sprue 7.

Further, a guide post 19 extending along the contact / separation direction of the intermediate plate 3 and the movable plate 4 is inserted into the fixed side core plate 6. The guide post 19 is restricted from coming off to the intermediate plate 3 and the movable plate 4 side by the flange portion 19a formed on one end side (right end side in FIG. 1). The guide post 19 penetrates the intermediate plate 3 via the guide bushes 21 and 22 provided on the first cavity plate 12 and the first intermediate plate main body 14 of the intermediate plate 3, which will be described later. The other end of the guide post 19 is inserted into the movable plate 4. Guided by the guide post 19 formed in this way, the intermediate plate 3 and the movable plate 4 slide and move with respect to the fixed plate 2.

The movable plate 4 is arranged adjacent to a movable side mounting plate 23 mounted on an injection molding machine (not shown) and an intermediate plate 3, and is movable in cooperation with the intermediate plate 3 to form a second molding portion 18. It includes a side core plate 24. The movable core plate 24 has a split surface 24a that comes into contact with the intermediate plate 3 in a state where the movable plate 4 and the intermediate plate are in contact with each other, and the split surface 24a is the movable core 25 that constitutes the second molding portion 18. Is provided.

The intermediate plate 3 is located between the first cavity plate 12 arranged on the fixed plate 2 side, the second cavity plate 13 arranged on the movable plate 4 side, and the first cavity plate 12 and the second cavity plate 13. It includes a pair of arranged intermediate plate main bodies 14, 15 (first intermediate plate main body 14, second intermediate plate main body 15).
The first cavity plate 12 has a dividing surface 12a facing the dividing surface 6a of the fixed core plate 6, and the first cavity 16 is formed on the dividing surface 12a at a position facing the fixed core 10. The first molded portion 17 is formed by the first cavity 16 and the fixed core 10 of the fixed core plate 6.

On the other hand, the second cavity plate 13 has a dividing surface 13a facing the dividing surface 24a of the movable core plate 24, and the second cavity 26 is formed on the dividing surface 13a at a position facing the movable core 25. There is. The second molded portion 18 is formed by the second cavity 26 and the movable core 25 of the movable core plate 24.

FIG. 2 is an explanatory view showing the positional relationship between the first molded portion 17 and the second molded portion 18, and shows a state of the intermediate plate 3 and the movable plate 4 as viewed from the contact / separation direction.
Here, as shown in FIG. 2, the position of the first molded portion 17 and the position of the second molded portion 18 are deviated from the contact / separation direction of the intermediate plate 3 and the movable plate 4. With such a positional relationship, the resin discharge port 7b of the sprue 7 and the resin discharge port 7b of the sprue 7 and the first cold runner portion 31, which will be described later, communicate with the first molding portion 17 (first cavity 16). The formation position of the second cold runner portion 32, which will be described later, which communicates with the second molding portion 18 (second cavity 26) can be shifted.

(Runner plate)
As shown in FIG. 1, the first intermediate plate main body 14 and the second intermediate plate main body 15 have a dividing surface 14a and a dividing surface 15a, which are arranged so as to face each other. The divided surface 14a is provided with a first runner plate 27 at most of the center in the surface direction. On the other hand, the second runner plate 28 is provided on most of the divided surface 15a of the second intermediate plate main body 15 from the first intermediate plate main body 14 in the center in the surface direction. The runner plates 27 and 28 are provided with facing dividing surfaces 27a and 28a, respectively, and the divided surfaces 27a and 28a are provided with cold runner portions 31 and 32 (first cold runner portion 31 and second cold runner portion 32, respectively). ) Is formed.

FIG. 3 is a perspective view of the injection molding die 1 from the split surface 28a side of the second runner plate 28. The cold runner portions 31 and 32 formed on the first runner plate 27 and the cold runner portions 31 and 32 formed on the second runner plate 28 are formed in the same shape, respectively. Therefore, for each of the cold runner portions 31 and 32, only the cold runner portions 31 and 32 of the second runner plate 28 shown in FIG. 3 will be described, and the cold runner portions 31 and 32 of the first runner plate 27 will be described. Omit.

As shown in FIGS. 1 and 3, the first cold runner portion 31 extends linearly from the resin discharge port 7b of the sprue 7 to the position corresponding to the first molding portion 17 (first cavity 16). Has been done. Both ends of the first cold runner portion 31 in the longitudinal direction are first formed via a first gate sprue 34a formed on the first runner plate 27 and a first gate 34b formed on the first intermediate plate main body 14. It is communicated to the part 17.

On the other hand, the second cold runner portion 32 is formed so as to extend linearly from the resin discharge port 7b of the sprue 7 to the position corresponding to the second molding portion 18 (second cavity 26). Both ends of the second cold runner portion 32 in the longitudinal direction are formed through the second gate sprue 35a formed on the second runner plate 28 and the second gate 35b formed on the second intermediate plate main body 15. It is communicated to the part 18.

Further, the runner lock pin 30 is provided at a position corresponding to the first cold runner portion 31 on the second intermediate plate main body 15 and the second runner plate 28. The runner lock pin 30 is a side (second intermediate plate main body 15) on which the runner lock pin 30 is provided when the injection molding die 1 is released from the first runner R1 to be described later, which is formed in the first cold runner portion 31. It is for leaving on the side).

Here, the cold runner portions 31 and 32 are orthogonal to each other at positions facing the resin discharge port 7b of the sprue 7. The resin discharge port 7b of the sprue 7 faces the orthogonal portions of the cold runner portions 31 and 32. Further, at orthogonal points of the cold runner portions 31 and 32, that is, at positions facing the resin discharge port 7b of the sprue 7, communication and blocking of the first cold runner portion 31 and communication of the second cold runner portion 32 are performed. A switching mechanism 33 for alternately switching between the cutoff and the cutoff is provided.

(Switching mechanism)
The switching mechanism 33 is a pair of a substantially columnar runner changer 36 rotatably supported by the second cavity plate 13 and a pair provided on the split surface 28b side of the second runner plate 28 on the second cavity plate 13 side. It is equipped with a cam 37 of the above.
The runner changer 36 is supported so that its rotation axis C is along the contact / separation direction of the intermediate plate 3 and the movable plate 4. Further, a flange portion 36a is formed at the base end (left end in FIG. 1) of the runner changer 36, and movement to the first runner plate 27 side is restricted. The tip 36b (right end in FIG. 1) of the runner changer 36 extends so as to abut the resin discharge port 7b of the sprue 7 in a state where the fixing plate 2 and the intermediate plate 3 are molded.

A switching runner flow path 38 is formed at the tip 36b of the runner changer 36. The switching runner flow path 38 passes on the rotation axis of the runner changer 36 and is formed linearly over the entire radial direction of the runner changer 36.

FIG. 4 is a side view of the runner changer 36.
As shown in FIGS. 3 and 4, a guide groove 39 is formed on the outer peripheral surface of the runner changer 36 over the entire circumference. The guide groove 39 has a first guide groove 41 that gradually extends toward the tip 36b of the runner changer 36 toward one rotation direction Y1, and the runner changer 36 gradually extends toward one rotation direction Y1. It is composed of a second guide groove 42 extending diagonally toward the flange portion 36a of the above. The first guide grooves 41 and the second guide grooves 42 are arranged alternately, and the guide grooves 41 and 42, respectively, are formed in communication with each other. Further, four guide grooves 41 and 42 are formed, respectively. Further, the guide grooves 41 and 42 are formed so that one first guide groove 41 and one second guide groove 42 connected to the first guide groove 41 exist in a region of 90 ° in the circumferential direction. Has been done. Then, a pair of cams 37 are inserted into the guide grooves 39 formed in this way.

The pair of cams 37 are arranged on the radial outer side of the runner changer 36. The pair of cams 37 are arranged around the runner changer 36 so as to face each other in the radial direction of the runner changer 36. Since these pair of cams 37 have the same structure, only one of the pair of cams 37 will be described in the following description, and the description of the other cam 37 will be omitted.
The cam 37 is fixed to the second runner plate 28, and has a support portion 43 erected from the second runner plate 28 toward the movable plate 4 side (lower side in FIG. 3) and a second runner plate of the support portion 43. It is composed of a cam body 44 projecting from the tip opposite to the 28 toward the runner changer 36. The cam body 44 is inserted into the guide groove 39 of the runner changer 36.

The support portion 43 is formed in a substantially rectangular parallelepiped shape. On the other hand, the cam main body 44 is formed in a substantially triangular columnar shape, and has a first cam side 44a along the first guide groove 41 of the guide groove 39 and a second cam side 44b along the second guide groove 42. doing. Rotational force is applied to the runner changer 36 by the guide grooves 41 and 42 and the cam sides 44a and 44b, and one of the first cold runner portion 31 and the second cold runner portion 32 is communicated with each other. It shuts down or shuts off (details will be described later).

(Lock mechanism)
Further, as shown in FIG. 1, the injection molding die 1 has lock mechanisms 50A and 50B (first lock mechanism 50A and second lock mechanism 50B) on two outer surfaces facing each other with the sprue 7 interposed therebetween, respectively. It is provided. Each of the lock mechanisms 50A and 50B is composed of a pair. Of the locking mechanisms 50A and 50B, a pair of first locking mechanisms 50A are provided on the fixing plate 2 side (right side in FIG. 1) of the intermediate plate 3.

The first lock mechanism 50A is provided so as to straddle the fixed plate 2 and the intermediate plate 3. Then, the first lock mechanism 50A maintains the mold-fastened state of the fixed plate 2 and the intermediate plate 3. Further, among the lock mechanisms 50A and 50B, the pair of second lock mechanisms 50B are provided on the movable plate 4 side (left side in FIG. 1) of the intermediate plate 3. The second lock mechanism 50B is provided so as to straddle the movable plate 4 and the intermediate plate 3. Then, the second lock mechanism 50B maintains the mold-fastened state of the movable plate 4 and the intermediate plate 3. Hereinafter, the detailed structure of each of the lock mechanisms 50A and 50B will be described.

FIG. 5 is a cross-sectional view of the first locking mechanism 50A. The first lock mechanism 50A and the second lock mechanism 50B have the same structure. Therefore, in the following description, only the first lock mechanism 50A will be described, and the second lock mechanism 50B will be partially described as necessary. Incidentally, the first locking mechanism 50A shown in FIG. 5 corresponds to the cross section of the portion A in FIG.

As shown in FIG. 5, the first lock mechanism 50A is provided on the outer surface of the fixed lock portion 51 provided on the outer surface of the first cavity plate 12 of the intermediate plate 3 and the outer surface of the fixed side core plate 6 of the fixed plate 2. The movable lock portion 52 is provided.
The fixing lock portion 51 includes a first fixing block 53 fixed to the outer surface of the first cavity plate 12, and a fixing pin 54 supported by the first fixing block 53. The first fixed block 53 is formed in a substantially cubic shape. A key 55 is provided on the mating surfaces 53a and 12b of the first fixing block 53 and the first cavity plate 12. The key 55 determines the position of the first fixed block 53 with respect to the first cavity plate 12 with high accuracy, and regulates the deviation of the first fixed block 53 with respect to the first cavity plate 12.

The first fixed block 53 is formed with a first pin insertion hole 56 that penetrates along the contact / separation direction (left-right direction in FIG. 5) of the intermediate plate 3 and the movable plate 4. A fixing pin 54 is inserted through the first pin insertion hole 56. A flange portion 54a is formed on the fixing pin 54 on the base end side (left end side in FIG. 5). The flange portion 54a regulates the removal of the fixing pin 54 from the first fixing block 53 to the fixing plate 2 side. The tip end side (right end side in FIG. 5) of the fixing pin 54 projects from the first fixing block 53 toward the fixing side core plate 6.

On the other hand, the movable lock portion 52 includes a second fixed block 57 fixed to the outer surface of the fixed core plate 6, a lock pin 58 provided so as to be slidable with respect to the second fixed block 57, and a lock pin 58. The main configuration is an air cylinder 59 for operating the air cylinder 59.
The second fixed block 57 is formed in a substantially rectangular parallelepiped shape along the normal direction of the outer surface of the fixed core plate 6. A key 61 is provided on the mating surfaces 57a and 6b of the second fixed block 57 and the fixed core plate 6. The key 61 determines the position of the second fixed block 57 with respect to the fixed core plate 6 with high accuracy, and regulates the deviation of the second fixed block 57 with respect to the fixed core plate 6.

The second fixed block 57 is formed with a second pin insertion hole 62 that penetrates coaxially with the first pin insertion hole 56 of the first fixed block 53. The hole diameter of the second pin insertion hole 62 is set to be substantially the same as the hole diameter of the first pin insertion hole 56. As a result, the fixing pin 54 is inserted into the second pin insertion hole 62.

Further, the second fixing block 57 is formed with a lock pin storage hole 63 that communicates between the second pin insertion hole 62 and the end surface 57b of the second fixing block 57 opposite to the fixed side core plate 6. There is. The lock pin storage hole 63 is formed in a stepped shape along the normal direction of the outer surface of the fixed side core plate 6. That is, the lock pin storage hole 63 has a diameter reduced by a step on the fixed side core plate 6 side of the first storage hole 63a and the first storage hole 63a formed on the end surface 57b of the second fixing block 57. The two storage holes 63b and the third storage hole 63c whose diameter is reduced by a step on the fixed side core plate 6 side of the second storage hole 63b are formed in communication with each other.

The lock pin 58 is housed in the second storage hole 63b and the third storage hole 63c of the lock pin storage hole 63 configured in this way. The lock pin 58 is formed in a stepped shaft shape so as to correspond to the shapes of the second storage hole 63b and the third storage hole 63c of the lock pin storage hole 63. That is, the lock pin 58 is integrally molded with the pin body 58a stored in the third storage hole 63c on the base end side (second storage hole 63b side) of the pin body 58a, and is stored in the second storage hole 63b. It is composed of a flange portion 58b and a lock convex portion 58c integrally molded on the tip end side of the pin body 58a.

The flange portion 58b is formed with a stepped diameter with respect to the pin body 58a so as to correspond to the hole diameter of the second storage hole 63b. O-rings 64 and 65 are provided between the pin body 58a and the third storage hole 63c, and between the flange portion 58b and the second storage hole 63b, respectively. As a result, the lock pin 58 is slidably stored in the lock pin storage hole 63 while being restricted from moving toward the fixed core plate 6. Further, the space between the lock pin storage hole 63 and the lock pin 58 is sealed.

Further, the lock convex portion 58c has a reduced diameter formed by a step with respect to the pin main body 58a. Then, the lock convex portion 58c can freely appear and disappear from the third storage hole 63c of the second fixing block 57 toward the second pin insertion hole 62.
Here, the fixing pin 54 inserted through the second pin insertion hole 62 is formed with a lock recess 54b into which the lock protrusion 58c can be fitted at a position corresponding to the lock protrusion 58c. When the lock convex portion 58c of the lock pin 58 is fitted into the lock concave portion 54b, the sliding movement of the fixing pin 54 with respect to the movable lock portion 52 is restricted.

Further, a cap 66 is provided in the first storage hole 63a of the lock pin storage hole 63 so as to close the first storage hole 63a. The cap 66 is provided with a convex portion 66a that is fitted into the second storage hole 63b. The protruding height of the convex portion 66a is set to a height at which the lock pin 58 can be slidably moved so that the lock convex portion 58c of the lock pin 58 can be removed from the lock concave portion 54b of the fixing pin 54.

In the air cylinder 59 that operates the lock pin 58, the piston rod 59a is connected to the lock pin 58. The cylinder tube 59b of the air cylinder 59 projects to the outside of the cap 66 through the cylinder insertion hole 66b formed in the cap 66. Air is supplied from the protruding portion of the cylinder tube 59b.
Under such a configuration, when air is supplied to the air cylinder 59, the piston rod 59a expands and contracts with respect to the cylinder tube 59b. Then, along with this expansion / contraction movement, the lock pin 58 moves in and out from the third storage hole 63c toward the second pin insertion hole 62.

Here, the arrangement configuration of the second lock mechanism 50B is plane-symmetrical with the first lock mechanism 50A about the intermediate plate 3. That is, in the case of the second lock mechanism 50B, the fixed lock portion 51 is provided on the outer surface of the second cavity plate 13 of the intermediate plate 3. Further, a movable lock portion 52 is provided on the outer surface of the movable core plate 24 of the movable plate 4.

(Operation of injection molding die)
Next, the operation of the injection molding die 1 will be described.
As shown in FIGS. 1 and 5, when injection molding the resin molded products S1 and S2 (see FIGS. 7 and 8), first, the fixing plate 2 and the intermediate plate 3 are molded (intermediate between the fixing plate 2 and the intermediate plate 2). Along with (contacting the plate 3), the intermediate plate 3 and the movable plate 4 are molded (the intermediate plate 3 and the movable plate 4 are brought into contact with each other).

Here, in the first lock mechanism 50A and the second lock mechanism 50B, before molding the fixed plate 2 and the intermediate plate 3 and before molding the intermediate plate 3 and the movable plate 4, the air cylinder 59 The lock pin 58 is degenerated by. Therefore, when the fixing plate 2 and the intermediate plate 3 are molded, and when the intermediate plate 3 and the movable plate 4 are molded, the second pin insertion hole of the second fixing block 57 in each of the lock mechanisms 50A and 50B is inserted. A fixing pin 54 is inserted into each of the 62. When the fixing pin 54 is inserted into the second pin insertion hole 62, the fixing plate 2 and the intermediate plate 3 are further molded, and the intermediate plate 3 and the movable plate 4 are molded, each lock mechanism 50A , 50B air cylinder 59 is driven. Then, the lock pin 58 is extruded toward the fixing pin 54, and the lock convex portion 58c of the lock pin 58 is fitted into the lock recess 54b of the fixing pin 54. As a result, the movement of the fixing pin 54 is restricted, the mold-fastened state of the fixed plate 2 and the intermediate plate 3 is maintained, and the mold-fastened state of the intermediate plate 3 and the movable plate 4 is maintained (locked state). ..

Next, as shown in FIG. 1, the molten resin is poured into the sprue 7 from an injection molding machine (not shown). The molten resin poured into the sprue 7 flows into the switching runner flow path 38 of the runner changer 36 which is in contact with the resin discharge port 7b of the sprue 7.

FIG. 6 is a perspective view showing the second runner plate 28 and the switching mechanism 33.
Here, as shown in FIGS. 3 and 6, the switching runner flow path 38 passes on the rotation axis of the runner changer 36 and is formed linearly over the entire radial direction of the runner changer 36. In a state where the fixed plate 2, the intermediate plate 3, and the movable plate 4 are molded, one of the two cold runner portions 31 and 32 and the sprue 7 are communicated with each other. Further, of the two cold runner portions 31 and 32, the other cold runner portion 31 and 32 and the sprue 7 are cut off from each other.

In FIG. 6, the runner changer 36 communicates the first cold runner portion 31 with the switching runner flow path 38. On the other hand, the runner changer 36 blocks the second cold runner portion 32. In the following description, first, as shown in FIG. 6, a case where the first cold runner unit 31 is communicated with each other will be described.

FIG. 7 is an explanatory view showing a state in which the molten resin has flowed into the first molded portion 17 of the fixed plate 2 using the first cold runner portion 31.
As shown in FIGS. 6 and 7, the molten resin that has flowed into the switching runner flow path 38 flows into the first cold runner section 31, and further passes through the first gate sprue 34a and the first gate 34b to the first molding section. The first cavity 16 of 17 is filled. After that, the molten resin filled in the first cold runner portion 31, the first gate sprue 34a, the first gate 34b, and the first cavity 16 is cooled to form the first runner R1 and the first resin molded product S1. Will be done.

FIG. 8 is an explanatory view showing a state in which the molten resin has flowed into the second molded portion 18 of the movable plate 4 using the second cold runner portion 32.
Here, as shown in FIG. 8, when the second cold runner portion 32 is communicated with the runner changer 36 via the switching runner flow path 38, while the first cold runner portion 31 is blocked. It is as follows. That is, the molten resin that has flowed into the switching runner flow path 38 flows into the second cold runner portion 32, and further fills the second cavity 26 of the second molding portion 18 via the second gate sprue 35a and the second gate 35b. Will be done. After that, the molten resin filled in the second cold runner portion 32, the second gate sprue 35a, the first gate 35b, and the second cavity 26 is cooled to form the second runner R2 and the second resin molded product S2. Will be done.

Next, a method for taking out the resin molded products S1 and S2, a molding procedure for the resin molded products S1 and S2, and a method for switching the switching mechanism 33 will be described. Here, a case where the second resin molded product S2 is taken out will be described.
FIG. 9 is a schematic configuration diagram of an injection molding die 1 showing a state in which the intermediate plate 3 and the movable plate 4 are opened (a state in which the mold is released).
As shown in FIGS. 5 and 9, when the second resin molded product S2 is taken out, the locked state of the second lock mechanism 50B straddling the movable core plate 24 of the movable plate 4 and the second cavity plate 13 of the intermediate plate 3 To cancel. That is, the lock pin 58 is retracted by the air cylinder 59. Then, the lock convex portion 58c of the lock pin 58 is removed from the lock concave portion 54b of the fixing pin 54. As a result, the fixing pin 54 is allowed to move in the exit direction from the second pin insertion hole 62.

On the other hand, the first lock mechanism 50A straddling the fixed side core plate 6 of the fixed plate 2 and the first cavity plate 12 of the intermediate plate 3 is maintained in a locked state.
From this state, as shown in FIG. 9, the mold is opened between the second cavity plate 13 of the intermediate plate 3 and the movable core plate 24 of the movable plate 4. At the same time, the molds of the first intermediate plate main body 14 and the second intermediate plate main body 15 of the intermediate plate 3 are opened.
On the other hand, the mold-fastened state of the first cavity plate 12 of the intermediate plate 3 and the fixed-side core plate 6 of the fixed plate 2 is maintained. Since the first cavity plate 12 and the fixed side core plate 6 are provided with the first lock mechanism 50A, the first cavity plate 12 and the fixed side core plate 6 are molded by the first lock mechanism 50A. Is reliably maintained.

By opening the mold between the second cavity plate 13 and the movable core plate 24, the second resin molded product S2 filled and molded in the second cavity 26 of the second molding portion 18 is exposed. Therefore, the second resin molded product S2 is taken out when the second cavity plate 13 and the movable core plate 24 are opened.

Further, the second runner R2 is exposed by opening the mold between the first intermediate plate main body 14 and the second intermediate plate main body 15. Since the second runner R2 is molded at the same time when the second resin molded product S2 is molded by the second molding portion 18, when the mold is opened between the first intermediate plate main body 14 and the second intermediate plate main body 15, the second runner R2 is second. The second runner R2 remains on the runner plate 28 side. The second runner R2 remaining on the second runner plate 28 side is taken out when the molds of the first intermediate plate main body 14 and the second intermediate plate main body 15 are opened.

Here, when the mold of the first intermediate plate main body 14 and the second intermediate plate main body 15 is opened, the mold of the second intermediate plate main body 15 and the second runner plate 28 provided on the second intermediate plate main body 15 is formed. It is configured so that the opening amount (moving amount) is different. That is, the amount of separation of the second runner plate 28 from the first intermediate plate main body 14 is set shorter than the amount of separation of the second intermediate plate main body 15 from the first intermediate plate main body 14. Therefore, when the mold is opened between the first intermediate plate main body 14 and the second intermediate plate main body 15, the second intermediate plate main body 15 to the second runner plate 28 face the first intermediate plate main body 14 side (right side in FIG. 9). (See arrow Y2 in FIG. 9).

At this time, as shown in FIG. 10, the pair of cams 37 provided on the second runner plate 28 are movable with respect to the runner changer 36 rotatably supported by the second cavity plate 13. It moves along the contact / separation direction of the plate 4 (direction of rotation axis C of the runner changer 36) (see arrow Y3 in FIG. 10).
Then, as shown in FIG. 4, the first cam side 44a of the cam body 44 inserted into the guide groove 39 of the runner changer 36 presses the inner side of the first guide groove 41 constituting the guide groove 39 ( See arrow Y4 in FIG. 4).

Here, since the first guide groove 41 extends diagonally toward the tip 36b of the runner changer 36 toward one rotation direction Y1 (see FIG. 3), the first guide groove 41 When the first cam side 44a of the cam body 44 presses the inner side, a rotational force is applied to the runner changer 36 (see arrow Y5). As a result, the runner changer 36 rotates around the rotation axis C.

Subsequently, the second cavity plate 13 of the intermediate plate 3 and the movable core plate 24 of the movable plate 4 are molded again. At the same time, the first intermediate plate main body 14 and the second intermediate plate main body 15 of the intermediate plate 3 are molded together. Also at this time, the pair of cams 37 move with respect to the runner changer 36. That is, the second cam side 44b of the cam body 44 presses the inner side of the second guide groove 42 of the runner changer 36 (see arrow Y6 in FIG. 4).

Here, since the second guide groove 42 is gradually extended toward the flange portion 36a of the runner changer 36 toward one rotation direction Y1 (see FIG. 3), the second guide groove 42 When the second cam side 44b of the cam body 44 presses the inner side of the cam body 44, the same direction as when the first cam side 44a of the cam body 44 presses the inner side of the first guide groove 41 against the runner changer 36 (arrow Y5). (See) rotational force is applied. As a result, the runner changer 36 further rotates around the rotation axis C.

In this way, the runner changer 36 operates the cam 37 that is interlocked with the opening / closing operation of the intermediate plate 3, that is, the approach of the second runner plate 28 to the second cavity plate 13 in which the runner changer 36 is rotatably supported. It rotates around the rotation axis C1 based on the separation operation. In other words, the runner changer 36 rotates around the rotation axis C1 based on the operation of the cam 37 (cam body 44) that reciprocates with respect to the runner changer 36 along the rotation axis C1 direction.
Here, each of the guide grooves 41 and 42 formed in the runner changer 36 has one first guide groove 41 and one second guide connected to the first guide groove 41 in a region of 90 ° in the circumferential direction. It is formed so that the groove 42 and the groove 42 exist. That is, when the cam 37 (cam body 44) reciprocates once with respect to the runner changer 36, the runner changer 36 rotates by 90 °.

Further, the cold runner portions 31 and 32 of the runner plates 27 and 28 are orthogonal to each other at positions facing the resin discharge port 7b of the sprue 7. Therefore, when the runner changer 36 rotates by 90 °, the cold runner portions 31 and 32 that communicate with each other are switched.
Then, when all of the fixed plate 2, the intermediate plate 3, and the movable plate 4 are molded again, the molten resin is poured into the sprue 7 from an injection molding machine (not shown). The molten resin poured into the sprue 7 is filled in the cavities 16 and 26 of the predetermined molding portions 17 and 18 through the predetermined cold runner portions 31 and 32 via the switching runner flow path 38 of the runner changer 36.

Here, the plates 2, 3 and 4 in which the mold is opened and the plates 2, 3 and 4 in which the mold tightening state is maintained are alternately switched according to the orientation of the runner changer 36.
That is, when the first cold runner portion 31 is communicated with the runner changer 36, the locked state of the first lock mechanism 50A is maintained, and the fixed plate 2 and the first cavity plate 12 remain molded. become. On the other hand, the second cavity plate 13 and the movable core plate 24 are mold-opened, and the first intermediate plate main body 14 and the second intermediate plate main body 15 are mold-opened.

On the other hand, when the second cold runner portion 32 is communicated by the runner changer 36, the locked state of the second lock mechanism 50B is maintained, and the second cavity plate 13 and the movable core plate 24 are molded. It will be in the same state. On the other hand, the fixing plate 2 and the first cavity plate 12 are mold-opened, and the first intermediate plate main body 14 and the second intermediate plate main body 15 are mold-opened.

In this way, an injection molding machine (not shown) is operated while alternately filling the first cavity 16 of the first molding portion 17 and the second cavity 26 of the second molding portion 18 with molten resin.
That is, the resin molded by either the first molded portion 17 or the second molded portion 18 while cooling the molten resin filled in either the first molded portion 17 or the second molded portion 18. Molded products S1 and S2 are taken out. More specifically, it will be described with reference to FIG.

11A and 11B are explanatory views of a molding procedure of the resin molded products S1 and S2, and FIGS. 11A to 11D show each step.
That is, as shown in FIG. 11A, the second cavity 26 of the second molding portion 18 is filled with the molten resin, and while the molten resin is cooled, the first cavity 16 of the first molding portion 17 is formed. Is filled with molten resin.
Subsequently, as shown in FIG. 11B, while cooling the molten resin filled in the first cavity 16 of the first molding portion 17 and the first cold runner portion 31, the second cavity plate 13 And the movable core plate 24 are opened, and the second resin molded product S2 molded by the second molding portion 18 is taken out.

Subsequently, as shown in FIG. 11C, the second molding is continued while the molten resin filled in the first cavity 16 of the first molding portion 17 and the first cold runner portion 31 is being cooled. The second cavity 26 of the portion 18 is filled with the molten resin.
Subsequently, as shown in FIG. 11D, while cooling the molten resin filled in the second cavity 26 and the second cold runner portion 32 of the second molding portion 18, the fixing plate 2 and the second 1 The mold is opened from the cavity plate 12, and the first resin molded product S1 molded by the first molding portion 17 is taken out.
In this way, the first cavity 16 of the first molded portion 17 and the second cavity 26 of the second molded portion 18 are alternately filled with the molten resin, and the first resin molded by the first molded portion 17 is formed. The molded product S1 and the second resin molded product S2 molded by the second molding unit 18 are taken out alternately.

Here, the runner lock pin 30 is provided at a position corresponding to the first cold runner portion 31 on the second intermediate plate main body 15 and the second runner plate 28. Therefore, even when the fixed plate 2 and the first cavity plate 12 are mold-opened and the first intermediate plate main body 14 and the second intermediate plate main body 15 are mold-opened, the first runner R1 ( (See FIG. 7) remains on the second runner plate 28 side. That is, in each of the runners R1 and R2, when the second cavity plate 13 and the movable core plate 24 are mold-opened, or when the fixed plate 2 and the first cavity plate 12 are mold-opened. Will remain on the second runner plate 28 side.

As described above, the injection molding die 1 described above is on the side opposite to the fixing plate 2 with the fixing plate 2, the intermediate plate 3 provided so as to be detachable from the fixing plate 2, and the intermediate plate 3 sandwiched between them. It includes a movable plate 4 which is arranged and is provided so as to be in contact with and detachable from the intermediate plate 3. The fixed plate 2 includes a fixed-side mounting plate 5 that is mounted on an injection molding machine (not shown), and a fixed-side core plate 6 that cooperates with an intermediate plate 3 to form a first molding portion 17. The movable plate 4 includes a movable side mounting plate 23 that is mounted on an injection molding machine (not shown), and a movable side core plate 24 that cooperates with the intermediate plate 3 to form the second molding portion 18. Further, the cold runner portions 31 and 32 (first cold runner portion 31) are provided on the first runner plate 27 provided on the first intermediate plate main body 14 and the second runner plate 28 provided on the second intermediate plate main body 15, respectively. , The second cold runner portion 32) is formed. A first lock mechanism 50A is provided so as to straddle the fixed plate 2 and the intermediate plate 3. Further, a second lock mechanism 50B is provided so as to straddle the movable plate 4 and the intermediate plate 3.

Therefore, for example, while the second lock mechanism 50B is released, the movable plate 4 and the intermediate plate 3 are opened, and the second resin molded product S2 molded by the second molding portion 18 is taken out, the first lock is performed. The fixed plate 2 and the intermediate plate 3 can be reliably molded by the mechanism 50A, and the molten resin can be poured into the first molded portion 17. On the other hand, while the first lock mechanism 50A is released, the fixed plate 2 and the intermediate plate 3 are opened, and the first resin molded product S1 molded by the first molding portion 17 is taken out, the second lock mechanism 50B is used. The movable plate 4 and the intermediate plate 3 can be reliably molded, and the molten resin can be poured into the second molded portion 18. In this way, since the first molding portion 17 and the second molding portion 18 are used in order, even when the so-called stack mold type injection molding die 1 is used, a small injection molding machine can be used. Can be done. Further, while resin molding is performed by one of the molding portions 17 and 18 of the first molding portion 17 or the second molding portion 18, the resin molded products S1 and S2 molded by the other molding portions 17 and 18 are formed. You can take it out. Therefore, the productivity of resin molding can be improved.

Further, the first lock mechanism 50A operates the fixing pin 54 provided in the first cavity plate 12 of the intermediate plate 3, the lock pin 58 provided in the fixed side core plate 6 of the fixing plate 2, and the lock pin 58. It is provided with an air cylinder 59 to be operated. On the other hand, the second lock mechanism 50B operates the fixing pin 54 provided in the second cavity plate 13 of the intermediate plate 3, the lock pin 58 provided in the movable core plate 24 of the movable plate 4, and the lock pin 58. It is provided with an air cylinder 59 to be operated. Then, by operating each air cylinder 59, the lock protrusions 58c of the lock pin 58 are inserted into and removed from the lock recess 54b of the fixing pin 54, whereby the lock mechanisms 50A and 50B are maintained or released in the locked state. I'm doing it. Therefore, the lock mechanisms 50A and 50B can be simplified, and the injection molding die 1 can be miniaturized.

Here, the intermediate plate 3 is thinner than the fixed plate 2 and the movable plate 4. Therefore, by providing the fixing pin 54 on the intermediate plate 3, the air cylinder 59 can be easily provided on the relatively thick fixed plate 2 and the movable plate 4, respectively.

Further, cold runner portions 31 and 32 are adopted as runner portions for distributing the molten resin to the molded portions 17 and 18. Therefore, even in the so-called stack mold 1, which is an injection molding die 1, it is not necessary to heat the intermediate plate 3 as in the case of adopting a conventional hot runner. As a result, the intermediate plate 3 can be made thinner, and the injection molding die 1 can be made smaller.

Further, the runner lock pin 30 is provided at a position corresponding to the first cold runner portion 31 on the second intermediate plate main body 15 and the second runner plate 28. Therefore, even when the fixed plate 2 and the first cavity plate 12 are mold-opened and the first intermediate plate main body 14 and the second intermediate plate main body 15 are mold-opened, the first runner R1 ( (See FIG. 7) remains on the second runner plate 28 side. That is, in each of the runners R1 and R2, when the second cavity plate 13 and the movable core plate 24 are mold-opened, or when the fixed plate 2 and the first cavity plate 12 are mold-opened. Will remain on the second runner plate 28 side. Therefore, it is possible to easily identify the positions of the runners R1 and R2 when taking out the runners R1 and R2. In other words, the positions of the runners R1 and R2 at the time of mold opening can be set to be substantially the same. As a result, for example, when the runners R1 and R2 are taken out from the injection molding die 1 using an automatic machine or the like, the runners R1 and R2 can be easily gripped by the automatic machine, and the runners R1 and R2 can be taken out. Work can be facilitated.

In particular, by providing the runner lock pin 30 on the movable plate 4 side opposite to the side on which the sprue 7 is provided across the intermediate plate 3, each runner R1 and R2 remains melted without solidification. Can be reliably prevented. That is, the sprue 7 is heated so that the molten resin does not solidify. Therefore, by providing the runner lock pin 30 on the movable plate 4 side, it is possible to prevent the runners R1 and R2 from being melted under the influence of the heat of the sprue 7. As a result, the work of taking out the runners R1 and R2 can be reliably facilitated.

Further, at orthogonal points of the cold runner portions 31 and 32, that is, at positions facing the resin discharge port 7b of the sprue 7, communication and blocking of the first cold runner portion 31 and communication of the second cold runner portion 32 are performed. A switching mechanism 33 for alternately switching between the cutoff and the cutoff is provided. The switching mechanism 33 performs a switching operation based on the opening / closing operation of the intermediate plate 3.
Therefore, the first molding portion 17 and the second molding portion 18 can be used in order to perform resin molding. As a result, the injection molding machine can be downsized and the cost of the injection molding machine can be suppressed as compared with the case where the molten resin is poured into the first molding unit 17 and the second molding unit 18 at once.
Further, after the molten resin is poured into the first cavity 16 of the first molding portion 17, the molten resin is poured into the second cavity 26 of the second molding portion 18 while the molten resin of the first molding portion 17 is being cooled. Can be poured. Therefore, as compared with the case where the first molding portion 17 and the second molding portion 18 are resin-molded using separate injection molding dies 1, not only the number of injection molding machines can be reduced to one, but also resin molding can be performed. The productivity of the products S1 and S2 can also be improved.

Further, the switching mechanism 33 is a pair of cams provided on the dividing surface 28b side of the runner changer 36 rotatably supported by the second cavity plate 13 and the second cavity plate 13 of the second runner plate 28. 37 and. Then, when the second runner plate 28 approaches and separates from the second cavity plate 13, the runner changer 36 rotates to communicate and shut off the first cold runner portion 31 and to cut off the second cold runner portion 32. It is configured so that communication and interruption are switched alternately. In this way, the configuration of the switching mechanism 33 can be simplified, and the manufacturing cost of the injection molding die 1 can be reduced.

Further, the guide groove 39 of the runner changer 36 has one first guide groove 41 and one second guide groove 42 connected to the first guide groove 41 in a region of 90 ° in the circumferential direction. It is configured. Then, when the cam 37 (cam body 44) reciprocates once with respect to the runner changer 36, the runner changer 36 is configured to rotate by 90 °. Further, the cold runner portions 31 and 32 are orthogonal to each other at positions facing the resin discharge port 7b of the sprue 7, and the rotation axis C of the runner changer 36 is provided at the orthogonal positions. Therefore, the communication / blocking of the first cold runner unit 31 and the communication / blocking of the second cold runner unit 32 can be reliably and alternately switched. Further, it is possible to reliably switch between the case where the molten resin is poured into the first cold runner portion 31 and the case where the molten resin is poured into the second cold runner portion 32 by the one-time mold opening and mold clamping operation of the injection molding die 1. Can be done.

Further, the position of the first molded portion 17 and the position of the second molded portion 18 are deviated from the contact / separation direction of the intermediate plate 3 and the movable plate 4. With such a positional relationship, the resin discharge port 7b of the sprue 7 and the resin discharge port 7b of the sprue 7 and the first cold runner portion 31, which will be described later, communicate with the first molding portion 17 (first cavity 16). The formation position of the second cold runner portion 32, which will be described later, which communicates with the second molding portion 18 (second cavity 26) can be shifted. Therefore, it is possible to reliably switch between the case where the molten resin is poured into the first cold runner section 31 and the case where the molten resin is poured into the second cold runner section 32.

The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention.
Further, in the above-described embodiment, the case where the runner lock pin 30 is provided at the position corresponding to the first cold runner portion 31 on the second intermediate plate main body 15 and the second runner plate 28 has been described. However, the present invention is not limited to this, and the runner lock pin 30 may be provided at a position corresponding to the second cold runner portion 32 on the first intermediate plate main body 14 and the first runner plate 27. In this case, the runners R1 and R2 always remain on the first runner plate 27 side. Even with such a configuration, for example, the runners R1 and R2 can be easily gripped by an automatic machine, and the molding operation can be facilitated.

Further, in the above-described embodiment, the first lock mechanism 50A is provided with a fixing pin 54 on the first cavity plate 12 of the intermediate plate 3 and a lock pin 58 on the fixed side core plate 6 of the fixing plate 2. explained. Further, the case where the second lock mechanism 50B is provided with the fixing pin 54 on the second cavity plate 13 of the intermediate plate 3 and the lock pin 58 on the movable core plate 24 of the movable plate 4 has been described. However, the present invention is not limited to this, and the fixed core plate 6 and the movable core plate 24 are provided with fixing pins 54, respectively, and the first cavity plate 12 and the second cavity plate 13 are provided with lock pins 58, respectively. It may be provided.

Further, in the above-described embodiment, the case where each of the lock mechanisms 50A and 50B is composed of the fixed lock portion 51 and the movable lock portion 52 has been described. Each of the lock mechanisms 50A and 50B forms a lock recess 54b in the fixing pin 54, and when the lock protrusion 58c of the lock pin 58 is fitted into the lock recess 54b, the lock mechanism 50A and 50B with respect to the movable lock portion 52 of the fixing pin 54. The case where slide movement is restricted has been described. The configurations of the lock mechanisms 50A and 50B are not limited to the above, and the fixed plate 2 and the intermediate plate 3 can be maintained in a molded state, and the intermediate plate 3 and the movable plate 4 are molded. Any configuration can be maintained with. Further, instead of the lock recess 54b formed in the fixing pin 54, a through hole penetrating in the radial direction is formed in the fixing pin 54, and the lock convex portion 58c of the lock pin 58 is fitted into the through hole. It may be configured.

Further, in the above-described embodiment, the guide groove 39 of the runner changer 36 is provided in a region of 90 ° in the circumferential direction, one first guide groove 41 and one second guide groove 42 connected to the first guide groove 41. The case where and is configured to exist has been described. Then, the case where the first guide groove 41 is formed so as to gradually extend toward the tip 36b of the runner changer 36 toward one rotation direction Y1 has been described. Further, the case where the second guide groove 42 is formed so as to gradually extend toward the flange portion 36a of the runner changer 36 toward one rotation direction Y1 has been described. However, the shape of the guide groove 39 is not limited to the above, and may be any shape. The shape of the guide groove 39 is formed so that when the cam 37 (cam body 44) reciprocates once with respect to the runner changer 36, the runner changer 36 rotates at a desired angle, and the first cold runner portion 31 and the second cold runner portion 31 and the second cold. It suffices if it is configured so that it can be switched with the runner unit 32.

Further, in the above-described embodiment, the case where the cold runner portions 31 and 32 are adopted as the runner portions for distributing the molten resin to the molded portions 17 and 18 has been described. However, the present invention is not limited to this, and the runner portion may be used as a hot runner.

1 ... Injection molding mold, 2 ... Fixed plate, 3 ... Intermediate plate, 4 ... Movable plate, 5 ... Fixed side mounting plate (fixed plate), 6 ... Fixed side core plate (fixed plate), 7 ... Sprue, 12 ... 1st cavity plate (intermediate plate), 13 ... 2nd cavity plate (2nd intermediate plate body), 14 ... 1st intermediate plate body (intermediate plate), 15 ... 2nd intermediate plate body (1st intermediate plate body), 16 ... 1st cavity (1st molded part), 17 ... 1st molded part, 18 ... 2nd molded part, 23 ... Movable side mounting plate (movable plate), 24 ... Movable side core plate (movable plate), 26 ... 2nd cavity (2nd molded part), 27 ... 1st runner plate (runner plate), 28 ... 2nd runner plate (runner plate), 31 ... 1st cold runner part (1st runner part), 32 ... 2nd Cold runner part (second runner part), 50A ... 1st lock mechanism, 50B ... 2nd lock mechanism, 54 ... Fixed pin (1st fixing pin, 2nd fixing pin), 54b ... Lock recess (1st lock hole, 2nd lock hole), 58 ... Lock pin (1st lock pin, 2nd lock pin), 58c ... Lock convex part, 59 ... Air cylinder (1st drive mechanism, 2nd drive mechanism)

Claims (3)

A fixed plate provided with a sprue into which molten resin is injected from the nozzle of an injection molding machine,
An intermediate plate provided so as to be detachable from the fixed plate,
A movable plate arranged on the side opposite to the fixed plate with the intermediate plate sandwiched between the intermediate plates and provided so as to be detachable from the intermediate plate.
A first molded portion formed between the fixed plate and the intermediate plate,
A second molded portion formed between the movable plate and the intermediate plate,
A runner provided on the intermediate plate and formed with a first runner portion that communicates the sprue and the first molded portion and a second runner portion that communicates the sprue and the second molded portion. With the plate
A switching mechanism that is arranged at a position facing the sprue of the intermediate plate and alternately switches between the communication state and the blocking state of the first runner portion and the communication state and the blocking state of the second runner portion.
When the first runner portion is provided so as to straddle the fixed plate and the intermediate plate and the first runner portion is brought into a communicating state by the switching mechanism, the fixed plate and the intermediate plate can be maintained in a molded state. 1 lock mechanism and
When the second runner portion is provided so as to straddle the movable plate and the intermediate plate and the second runner portion is brought into a communicating state by the switching mechanism, the movable plate and the intermediate plate can be maintained in a molded state. An injection molding die characterized by having a 2-lock mechanism. The first lock mechanism is
A first fixing pin provided on either one of the fixing plate and the intermediate plate,
A first lock pin provided on either one of the fixing plate and the intermediate plate, which can be inserted into a first lock hole formed in the first fixing pin and can be slidably moved.
The first drive mechanism that operates the first lock pin and
With
The second lock mechanism is
A second fixing pin provided on either the movable plate or the intermediate plate,
A second lock pin provided on either one of the movable plate and the intermediate plate, which can be inserted into a second lock hole formed in the second fixing pin and can be slidably moved.
The second drive mechanism that operates the second lock pin and
The injection molding die according to claim 1, further comprising. The injection molding die according to claim 2, wherein the intermediate plate is provided with the first fixing pin and the second fixing pin.

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