JP3005211B1 - Injection mold - Google Patents

Abstract

The present invention provides an injection mold capable of obtaining a smooth cut surface when an injection-molded molded product is cut at a gate portion between the product and a runner portion. SOLUTION: Injection molding dies, when the pressing force of an injection nozzle 6 is released, fixed-side and movable-side mold plates 10,1.
2, a pair of runner members 22 forming a runner,
Both 34 move in the mold clamping direction, and the cutting edge of the runner forming member 34 and the fixed-side mold plate 10 serve as scissors to cut and separate the product from the runner portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold capable of automatically cutting a molded product at a gate when the mold is opened.

[0002]

2. Related Background Art This type of injection mold is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 8-258091. This known injection molding die includes a gate cutting core housed so as to be able to protrude and retract into a movable mold plate. When the mold is opened, the gate cutting core protrudes from the movable mold plate, and the molded product is moved to a gate portion. Cut with. Thereby, when the molded product is taken out,
The molded product is automatically separated into a product molded in the cavity and a runner portion formed in the runner including the runner.

[0003]

Since the above-mentioned gate cutting core protrudes from the movable side mold plate only after the mold is opened, the gate edge of the molded product is formed only by the cutting edge, that is, the movable blade. Is cut, and the cutting cannot be performed smoothly. Also, when cutting molded products,
Since the mold is already open, the runner portion of the molded product is free. For this reason, since the runner portion is only pressed against the gate cutting core from one side thereof, the cutting by the gate cut core takes a form in which the runner portion is torn down from the gate portion of the molded product by pushing down the runner portion. .

[0004] Therefore, if the molded product is hard, gouges are formed on the cut surface of the product. Conversely, if the molded product is soft, burrs are formed on the cut surface of the product, and a smooth cut surface is obtained. Can not do. Such burrs and burrs become remarkable when the gate is arranged close to the fixed mold plate or when the thickness of the product is thin. In addition, even if the cutting edge of the gate cutting core is sharpened, the cutting edge cannot prevent the runner from falling down, and the above-mentioned gouging or burring cannot be eliminated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an injection mold capable of obtaining a smooth cut surface when a molded product is cut at a gate portion thereof. It is in.

[0006]

An injection molding die according to the present invention (Claim 1) includes a pair of runner forming members disposed in a pair of mold plates, respectively. These runner forming members are movable in the direction of mold clamping and mold opening, and are in close contact with each other at the time of mold clamping to form a runner connected to the cavity between the mold plates. Of these runner forming members, a part of the opening edge forming the gate is formed on the runner forming member located on the mold opening side, and this portion is a cutting edge.

[0007] The injection molding die further includes an urging means. The urging means moves the pair of runner forming members in close contact with each other to the pair of mold plates before opening the mold. Move. According to the above-mentioned injection mold,
When the mold clamping is completed, a molding material in a molten state is introduced into the cavity through the runner. After the molding material is solidified, the pair of mold plates are opened. Prior to the mold opening, both of the pair of runner forming members that are in close contact with each other and form the runner are molded with respect to the pair of mold plates. Move relatively in the tightening direction. As a result, the cut edge of one of the runner forming members has the edge of the mold plate on the mold closing side as a fixed blade, and the molded product is held in a state where the runner portion of the molded product is held between the pair of runner forming members. Cutting is performed at the gate portion, and the molded product is automatically separated into a product and a runner portion.

The urging means may include a spring member disposed in one of the mold plates on the mold opening side. The spring member has an injection nozzle of molding material pressed against a pair of runner forming members. At this time, the urging force of the pair of runner forming members is generated against the pressing force of the injection nozzle.
In this case, the injection of the molding material into the cavity is completed,
When the injection nozzle separates from the pair of runner forming members,
The pair of runner forming members move in the mold clamping direction with respect to the pair of mold members by the urging force of the spring member, and perform the above-described cutting operation.

The urging means is provided in one of the mold plates on the mold opening side, and presses the pair of runner forming members against a fixed side mounting plate supported by the other mold plate until the mold is opened. A first spring member, a guide that guides the other template in the direction of coming and going with respect to the fixed-side mounting plate, and a guide provided between the fixed-side mounting plate and the other template. A second spring member that presses the other template in a direction of separating the other template (claim 3). In this case, when the clamping force of the pair of template plates is released, both of the template plates receive the urging force of the second spring member and move in a direction away from the fixed-side mounting plate. The forming member is in a state of being pressed against the fixed-side mounting plate by the urging force of the first spring member, and the above-described cutting operation is similarly performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Referring to FIG. 1, there is shown an injection mold according to a first embodiment, and the injection mold has a fixed-side mounting plate 2. The fixed-side mounting plate 2 is vertically arranged, and a ring 4 is fixed to an outer surface thereof. This ring 4 forms an inlet 8 for guiding an injection nozzle 6.

A fixed mold plate 10 is fixed to the inner side surface of the fixed mounting plate 2.
The movable mold plate 12 is in close contact with 0. Movable mold plate 12
Are a front portion 14 and a rear portion 16 on the fixed side template 10 side.
These parts 14 and 16 are integrally connected. A stepped hole 18 is formed in the fixed side mounting plate 2 coaxially with the ring 4, and the stepped hole 18 penetrates through the fixed side mounting plate 2 and faces the entrance 8. The stepped hole 18 has a large diameter portion on the fixed side template 10 side and a small diameter portion on the ring 4 side.

A guide hole 20 is formed in the fixed mold plate 10 coaxially with the ring 4. The guide hole 20 is smaller in diameter than the large diameter portion of the stepped hole 18. Penetrates. A fixed-side runner forming member 22 is slidably fitted in the guide hole 20. The fixed-side runner forming member 22 includes an outer fixed-side float 24 and a sprue bush inserted into the fixed-side float 24. 26, which are integrally connected to each other. One end of the fixed-side float 24 projects into the large-diameter portion of the stepped hole 18, and the projecting end has a flange shape.

One end of the sprue bush 26 protrudes from the flange end of the fixed float 24, and the protruding end also has a flange shape. The flange end of the spool bush 26 is slidably guided into the small-diameter portion of the step hole 18, and the outer end surface of the flange end has a concave nozzle contact surface formed in the center. Sprue bush 26
A sprue 28 is formed concentrically therein, and one end of the sprue 28 is opened at a nozzle contact surface of the sprue bush 26.

The other end of the sprue 28 is connected to a fixed runner half 30 having a groove shape, and the runner half 30 is formed on the other end surfaces of the fixed float 24 and the sprue bush 26. Note that the lower end surfaces of the fixed float 24 and the sprue bush 26 are flush with each other, and are positioned on the parting line PL between the fixed mold plate 10 and the movable mold plate 12 in the illustrated state. I have.

A guide hole 32 is also formed in the front portion 14 of the movable mold plate 12, and the guide hole 32 passes through the front portion 14 coaxially with the guide hole 20 of the fixed mold plate 10. . The guide hole 32 has the same sectional shape as the guide hole 20 in shape and size, and a movable-side runner forming member 34 is slidably fitted therein. A movable runner half 36 having a groove shape is formed on one end surface of the runner forming member 34, and when the fixed and movable runner forming members 22 and 34 are in the close contact state shown in FIG. The bodies 30, 36 are aligned with each other and form a runner that continues to the sprue 28. The end of the runner forms a gate 40 that opens at the outer surfaces of the runner forming members 22 and 34, and the gate 40 faces the cavity 38.
The cavity 38 is formed between the movable mold plate 12 and the fixed mold plate 10 when the mold plate 12 and the fixed mold plate 10 are in close contact with each other.

As is apparent from FIG. 2, the end opening edge of the runner half 36, that is, a part forming the opening edge of the gate 40 is a sharp cutting edge 42, and the axis of the runner forming members 22 and 34 is formed. As viewed in the direction, the opening dimension of the gate 40 is indicated by H in FIG. A vertical groove 44 is formed in the inner surface of the guide hole 32 of the front portion 14, and the vertical groove 44 is located on the rear portion 16 side and extends in the axial direction of the guide hole 32. A stopper 46 of the runner forming member 34 is disposed in the vertical groove 44, and the stopper 46 is integrally provided to protrude from the other end of the runner forming member 34. Between the stopper 46 and the end of the vertical groove 44,
The interval A that is larger than the opening dimension H of the gate 40 described above.
The distance A determines the movement stroke of the runner forming member 34 when the runner forming member 34 moves from the illustrated state to the fixed mold plate 10 side. In the fixed-side runner forming member 22 as well, when in the state shown in the drawing, the gap A or more is secured between the flange end of the fixed-side float 24 and the step surface in the stepped hole 18. I have.

A spring chamber 48 is formed in the rear portion 16 of the movable mold plate 12, and the spring chamber 48 is
4 guide hole 32. In the spring chamber 48,
A compression coil spring 50 is disposed between the bottom wall and the runner forming member 34 on the movable side. Further, a through hole 54 is formed at the center of the runner forming member 34, and a sprue lock pin 54 is slidably inserted into the through hole 52. The sprue lock pin 54 is positioned coaxially with the sprue bush 26, one end of which is Z-shaped,
It forms part of the bottom of the runner described above. The other end of the sprue lock pin 54 protrudes from the runner forming member 34, penetrates through the rear portion 16 of the movable mold plate 12 from inside the compression coil spring 50, and extends outside the movable mold plate 12.

An ejector pin 56 and a return pin 58 are slidably penetrated in the movable mold plate 12, respectively. The ejector pin 56 and the return pin 58 are arranged on both sides of the sprue lock pin 54. I have. In the illustrated state, one end of the ejector pin 56 forms a part of the inner surface of the cavity 38,
The return pin 58 is in contact with the fixed template 10.

The other ends of the sprue lock pin 54, the ejector pin 56, and the return pin 58 are respectively connected to an ejector plate 60 in which two plates are bonded. It is connected to the ejector plate 60 with a predetermined play so as to allow movement in the axial direction to the side 10.

Ejector plate 60 and pins 54 and 5
A spacer block 62 is arranged outside the first and second spacer blocks 58 so as to surround them.
Numeral 2 connects the movable mold plate 12 and the movable mounting plate 64 to each other. In the illustrated state, the ejector plate 60 is in contact with the movable mounting plate 64. The movable mounting plate 64 is connected to an advance / retreat mechanism (not shown), and the movable mechanism moves the movable mold plate 12 via the movable mounting plate 64 and the spacer block 62. Thereby, the movable mold plate 12 comes into contact with and separates from the fixed mold plate 10,
The mold clamping and mold opening are performed. On the other hand, the ejector plate 60 can be moved toward the movable mold plate 12 by a pusher (not shown).

Further, a plurality of guide pins 66 protrude from the outer peripheral portion of the movable mold plate 12 toward the fixed mold plate 10, and when in the state shown in the figure, these guide pins 66 are fixed to the fixed mold plate 10. 10 is inserted through a guide sleeve 68 embedded in the guide sleeve 68. 1. Mold Clamping / Injection Completion The injection molding die shown in FIG. 1 shows a state in which the molten molding material has been injected from the injection nozzle 4 after the mold clamping, and the injection has been completed. In other words, in this state,
When the movable-side mounting plate 64 is moved in the mold-clamping direction toward the fixed-side mounting plate 2, the mold clamping is completed.
At the time of mold clamping, the movable mold plate 12 is brought into close contact with the fixed mold plate 10 with a predetermined mold clamping force F ₁ , and a cavity 38 is formed between the mold plates 12 and 10.

Further, at this time, the runner forming member 22 as shown by two-dot chain line in FIG. 1, i.e., the nozzle contact surface of the sprue bushing 26 injection nozzle 6 is pressed with a predetermined touch force F ₂ I have. When the injection nozzle 6 is pressed, the runner forming members 22 and 34 are displaced toward the movable mounting plate 64 together with the urging force of the compression coil spring 50. These runner forming members 22 and 34 are positioned such that the flange end of the fixed float 24 abuts on the fixed template 10, and the gate 40 of the runner communicates with the cavity 38 at a predetermined position. Further, the molding material injected from the injection nozzle 6 pushes the sprue lock pin 54 down toward the ejector plate 60 by the amount of the play due to the injection pressure.

When the cooling and solidification of the molding material is completed, the molding material injected into the cavity 38 is cooled, and when the solidification is completed, the injection nozzle 6 is connected to the sprue bush 2.
Away from the nozzle contact surface 6, releases the touch force F ₂ against the sprue bushing 26. Therefore, as shown in FIG. 3, both the runner forming members 34 and 22 receive the urging force of the compression coil spring 50, and the movable-side mounting members 34 and 22 are mounted until the stopper 46 of the runner forming member 34 contacts the end of the vertical groove 44. Both displace to the plate 2 side.

With the displacement of the runner forming members 34 and 22,
The gate 40 moves from the cavity 38 into the fixed mold plate 10 and cuts the product P molded in the cavity 38 and the runner portion R molded in the runner and the spool. 4 and 5, the cutting edge 42 of the runner forming member 34 cuts between the product P and the runner portion R using the edge of the fixed mold 10 as a fixed blade. Therefore, the cutting edge 42 and the fixed blade of the fixed side template 10 become scissors, and the cutting can be performed smoothly. Further, when the runner portion R is cut, the pair of runner forming members 34 and 22 are displaced in conjunction with the mold clamping direction C while holding the runner portion R from both sides. The cutting edge 42 of the runner forming member 34 satisfactorily cuts between the product P and the runner portion R without causing the generation. As a result, no gouge or burrs occur in the gate portion of the product P, and a smooth cut surface can be obtained.

Since the sprue lock pin 54 is engaged with the runner portion R, the sprue lock pin 54
Also displaces with the runner forming members 34,22. Mold Opening / Product Discharge After that, when the movable side mounting plate 64 is returned to the mold opening direction D (see FIG. 6) opposite to the mold clamping direction C, the movable side mold plate 1
2 is largely separated from the fixed side mold plate 10, and accordingly, the runner forming members 34 and 22 are also separated from each other. At this time, the product P is left in the cavity portion 38 a forming the cavity 38 on the movable mold plate 12 side, and the runner portion R is pulled out from the fixed-side spool bush 26 and the movable-side runner forming member 34. Is left on the runner half 36.

Thereafter, when the ejector plate 60 is pushed out in the discharge direction E on the fixed side mounting plate 2 side, the sprue lock pin 54 and the ejector pin 56 protrude from the runner forming member 34 and the above-described cavity portion 38a, respectively. As a result, the product H and the runner portion R are discharged from the injection mold as shown in FIG. Thereafter, the movable-side mounting plate 64 is moved in the mold clamping direction C, and the above-described operation is repeated through the state shown in FIG. The product P and the runner portion R discharged from the injection molding die are collected separately from each other.

Second Embodiment Referring to FIGS. 7 to 9, there is shown an injection mold according to a second embodiment. In describing the injection mold of the second embodiment, the same reference numerals are given to members and portions exhibiting the same functions as members and portions in the first embodiment, and description thereof will be omitted. Only the differences will be described below.

In the case of the injection molding die of the second embodiment, the fixed side mold plate 10 is not fixed to the fixed side mounting plate 2 and is fixed to the fixed side mounting plate 2 in the direction of clamping and opening. It is supported so that it can come and go. More specifically, the fixed side template 1
0 is provided with a plurality of guide pins 70, and these guide pins 70 are provided on the guide sleeve 7 embedded in the fixed side template 10.
2 are slidably inserted into the two. The guide sleeves 72 are arranged at equal intervals in the circumferential direction of the fixed side template 10.

In the state shown in FIG. 7, each guide pin 70 has its tip end slidably inserted into a corresponding guide sleeve 74 in the movable mold plate 12, and in the first embodiment. The function of the guide pin 66 is also performed. The guide sleeve 74 is embedded in the front part 14 of the movable mold plate 12. Further, a plurality of recesses 76 are formed in the outer peripheral portion of the fixed side template 10, and these recesses 7 are formed.
Numerals 6 are arranged at equal intervals in the circumferential direction of the fixed-side mold plate 10 and open toward the fixed-side mounting plate 2. Each recess 7
The compression coil springs 78 are arranged in the direction 6 in the direction in which the fixed-side mold plate 10 is separated from the fixed-side mounting plate 2, that is, the mold opening direction D.
It is energizing.

On the other hand, stopper bolts 80 are provided through the fixed-side mounting plate 2 corresponding to the recesses 76, and each stopper bolt 80 has a tip portion extending into the corresponding recess 76. It is screwed into the fixed side template 10 through the compression coil spring 78. Each stopper bolt 8
No. 0 has a stepped hole 8 formed in the fixed side mounting plate 2.
7, a gap corresponding to the above-described gap A is secured between the head of the stopper bolt 80 and the step surface of the stepped hole 82 when in the state shown in FIG.

In the case of the second embodiment, the runner forming member 22,
The runner formed between the 34 runner halves 30, 36 is longer than the runner of the first embodiment.
That is, as is apparent from FIG.
Reference numeral 34 denotes a state in which the axis is eccentric from the axis of the sprue bush 26 and the sprue lock pin 54. And
A compression coil spring 84 is accommodated in the rear portion 16 of the movable mold plate 12 at a position that is not concentric with the sprue lock pin 54 but shifted toward the runner side.
4 is in the state shown in FIG.
34 are pressed in the mold clamping direction C and pressed against the fixed-side mounting plate 2. Specifically, in this case, the fixed side float 24 of the runner forming member 22 is in contact with the fixed side mounting plate 2.

At the time of completion of mold clamping and injection molding As shown in FIG. 7, when the injection mold of the second embodiment is at the time of completion of mold clamping and injection, the fixed mold plate 10 is By being pushed, the compression coil spring 78 is pressed against the fixed-side mounting plate 2 in close contact with the urging force of the compression coil spring 78. The runner forming members 22 and 34 apply the urging force of the compression coil spring 84 and the rear part 1 of the movable mold plate 12.
6 and is pressed against the fixed-side mounting plate 2. In such a pressed state, the runner forming members 22 and 23 are positioned at their regular positions,
The gate 40 communicates with the cavity 38 at a predetermined position. Incidentally, the touch force F ₂ of the injection nozzle 6 is of course much smaller than the clamping force F ₁ of the movable side mold plate 12.

Since the runner between the runner forming members 22 and 34 is long as described above, the pressure receiving area of the runner (the projected area of the runner viewed from the axial direction of the runner forming members 22 and 34) is the same as that of the first embodiment. Larger than in the case of runners. For this reason, when the molding material is injected, the internal pressure generated in the runner acts greatly in the direction in which the runner forming members 22 and 34 are separated. However, at this time, since the runner forming member 22 is supported by the fixed-side mounting plate 2 and the runner forming member 34 is supported by the movable-side mold plate 12, the runner forming members 22 and 34 are separated from each other. There is no such thing. As a result, during injection of the molding material, the gate 40
Is reliably maintained, and the injection of the molding material in the cavity 38 can be performed stably.

When the cooling and solidification of the molding material is completed After that, when the injected molding material is cooled and solidified, the clamping force F ₁ of the movable-side mounting plate 64 is released, and the movable-side molding plate 1 is released.
2 moves together with the movable mold plate 64 in the mold opening direction. However, at this time, the movable template 12 does not separate from the fixed template 10.

That is, the fixed-side template 10 has a compression coil spring 7.
8, the movable mold plate 12 is urged in a direction away from the fixed-side mounting plate 2 so that the movable mold plate 12 is opened in the mold opening direction D.
, The fixed-side mold plate 10 also moves in the mold opening direction D while being in close contact with the movable-side mold plate 12. On the other hand, even if both the movable mold plate 12 and the fixed mold plate 10 move in the mold opening direction D, the runner forming members 22 and 34 are still fixed to the fixed mounting plate 2 by the urging force of the compression coil spring 84.
8, the fixed and movable mold plates 10 and 12 move in the mold opening direction D with respect to the runner forming members 22 and 34, as shown in FIG. Become.

Therefore, in this case, the runner forming member 3
4 becomes a fixed blade, and the edge of the fixed side template 10 becomes a movable blade, so that the product P and the runner portion R
Is cut off. In this cutting, since the runner forming members 22 and 34 hold the runner portion R, the runner portion R does not fall down and a smooth cut surface is formed as in the case of the first embodiment. Obtainable. At this time, since the stopper bolt 80 is screwed into the fixed template 10, the stopper bolt 80 moves with the fixed template 10 while being guided by the small-diameter portion of the stepped hole 82 in the fixed mounting plate 2.

Mold Opening / Product Discharge The movable mold plate 12 is further moved in the mold opening direction D, and the head of the stopper bolt 80 is fixed to the fixed attachment plate 2 (stepped hole 82).
When the stopper bolt 80 contacts the stopper step 80, the stopper bolt 80 moves.
That is, the movement of the fixed side template 10 is stopped. Therefore,
From this point, the movable mold plate 12 starts to separate from the fixed mold plate 10, and the mold is opened.

Thereafter, when the ejector plate 60 is moved in the discharge direction E, the product P and the runner portion R are discharged from the injection mold as shown in FIG. The present invention is not limited to the first and second embodiments described above, and various modifications are possible. For example,
The specific form of the gate and the arrangement and number of the compression coil springs can be arbitrarily changed according to the product to be injection-molded.

[0039]

As described above, in the injection molding die of the present invention (claim 1), when the molded product is cut between the product and the runner portion, the runner forming member on the mold opening side is cut. Since the edge and the edge of the mold plate on the mold clamping side function as scissors, and the runner portion is held from both sides between the pair of runner forming members, the cutting can be performed smoothly and reliably. As a result, it is possible to surely obtain a smooth cut surface without causing gouges or burrs on the cut surface of the product.

Prior to opening the mold, when the pressing force of the injection nozzle is released, the pair of runner forming members move together in the mold clamping direction with respect to the pair of mold plates. Is suitable when the length of the runner is relatively short. In contrast to this, prior to opening the mold, an injection molding die of a type in which a pair of mold plates move together in a mold opening direction with respect to a pair of runner forming members. (Claim 3) is suitable when the runner is relatively long.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an injection mold according to a first embodiment.

FIG. 2 is a partially enlarged view of the injection mold of FIG. 1;

FIG. 3 is a longitudinal sectional view of the injection mold of FIG. 1 showing a state where cooling and solidification has been completed and a pair of runner forming members have moved.

FIG. 4 is an enlarged cross-sectional view showing a state where a pair of runner forming members have begun to move.

FIG. 5 is an enlarged cross-sectional view showing a state in which movement of a pair of runner forming members has been completed.

FIG. 6 is a longitudinal sectional view showing a state in which the injection mold of FIG. 1 is opened.

FIG. 7 is a longitudinal sectional view of the injection mold of the second embodiment at the time of completion of mold clamping and injection.

8 is a vertical cross-sectional view of the injection mold of FIG. 7, showing a state where cooling and solidification are completed.

9 is a longitudinal sectional view of the injection mold of FIG. 7 showing a state where the mold is opened.

[Explanation of symbols]

 2 Fixed-side mounting plate 10 Fixed-side mold plate 12 Movable-side mold plate 22 Fixed-side runner forming member 24 Fixed-side float 26 Sprue bush 34 Movable-side runner forming member 40 Gate 42 Cutting edge 50 Compression coil spring 64 Moving-side mounting plate 70 Guide Pin (guide) 78 Compression coil spring (first spring member) 84 Compression coil spring (second spring member)

Continuation of the front page (56) References JP-A-6-198685 (JP, A) JP-A-6-238713 (JP, A) JP-A-63-151419 (JP, A) JP-A-2-175122 (JP, A) JP-A-63-147619 (JP, A) JP-A-57-105328 (JP, A) JP-A-1-182018 (JP, A) JP-A-11-116751 (JP, A) 63-82526 (JP, U) Japanese Utility Model Hei 6-74316 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/26-45/44 B29C 33/00-33 / 76

Claims (3)

(57) [Claims] 1. An injection molding die for injecting a molten molding material into a cavity between a pair of mold plates through a gate at a terminal of a runner, solidifying the molding material, opening the mold, and taking out a molded product. A pair of runner forming members that are provided in each of the mold plates and are movable in the direction of mold clamping and mold opening, and that are closely attached to each other to form the runner during mold clamping, and the runner formation on the mold opening side. A cutting edge provided on a member and serving as a part of an opening edge forming the gate, and prior to the mold opening, the pair of runner forming members in close contact with each other relative to the pair of mold plates. An injection mold comprising: a biasing means for moving. 2. The urging means is provided in one of the mold plates on the mold opening side, and when the pair of runner forming members are pressed by the injection nozzle of the molding material, the urging means receives the pressing force of the injection nozzle. The injection molding die according to claim 1, further comprising a spring member that generates a biasing force of the pair of runner members in opposition. 3. The biasing means is provided in one of the mold plates on the mold opening side, and applies the pair of runner forming members to a fixed mounting plate supporting the other mold plate until the mold is opened. A first spring member that presses, a guide that guides the other template in a direction toward and away from the fixed-side mounting plate, and is provided between the fixed-side mounting plate and the other template. The injection molding die according to claim 1, further comprising a second spring member that urges the other mold plate in a direction to separate the other mold plate from the fixed-side mounting plate.