JP2001341163A - Coupling structure of discharge nozzle of injection molding machine and introducing hole of mold for molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a leakage of a molding stock of a molten state from a connecting surface of the hole of the mold for molding to the nozzle of an injection molding machine. SOLUTION: A support cylinder 13b of a positioning means for positioning a spherical protrusion 21b of the discharge nozzle 21 by supporting outer periphery at a spherical recess 13d of the hole 13 of the mold for injection molding is provided between the hole 13 of the mold and the nozzle 21 of the injection molding machine to prevent occurrence of a misalignment of an inlet 13e of the hole 13 with the port 21c of the nozzle 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for connecting a discharge nozzle of an injection molding machine to an introduction hole of a molding die.

[0002]

2. Description of the Related Art Injection molding dies are used to introduce a molten molding material such as a synthetic resin or a metal in a molten state discharged from a discharge nozzle of an injection molding machine into a mold to form a predetermined molded product. In molding the molded product, a discharge nozzle of an injection molding machine is connected to an introduction hole of a molding die for introducing a molten molding material discharged from the discharge nozzle into the mold. Means are taken. In the connection of these two,
The spherical convex portion of the discharge nozzle is received in the spherical concave portion of the introduction hole portion, and the introduction port of the introduction hole portion opening in the spherical concave portion and the discharge port of the discharge nozzle opening in the spherical convex portion are mutually connected. It is connected to the opposing joint state, but a means is adopted in which the spherical convex portion of the discharge nozzle is received in the spherical concave portion of the introduction hole portion and pressed and connected to the spherical concave portion by the action of the hydraulic pressure of the injection molding machine. It is common.

[0003] Thus, between the discharge nozzle of the injection molding machine and the introduction hole of the injection mold, the discharge surface of the discharge nozzle is discharged by the joint surface between the spherical projection of the discharge nozzle and the spherical recess of the introduction hole. The leakage of the formed molding material in the molten state is prevented.

FIG. 1 shows a conventional connection structure for connecting a discharge nozzle of an injection molding machine to an introduction hole of a molding die. The connection structure connects the spool bush 12 that is fitted to the center of the fixed die 11 of the molding die 10a on the distal end side to form an introduction hole, and the discharge nozzle 21 of the injection molding machine. Due to the connection structure, a molten molding material discharged from the discharge nozzle 21, for example, a melt of a light alloy such as a synthetic resin, an aluminum alloy, or a magnesium alloy is introduced into the cavity of the fixed mold 11 through the introduction hole 12 a of the spool bush 12. Then, a molded product made of a synthetic resin or a molded product of a light alloy is molded in the molding die 10a.

The spool bush 12 constituting the molding die 10a has an introduction hole 12a for introducing a molten molding material discharged from the discharge port of the discharge nozzle 21. A concave part 12b is formed. The introduction port 12c of the introduction hole 12a opens at the center of the spherical concave portion 12b. On the other hand, the discharge nozzle 21 constituting the injection molding machine is provided with a discharge hole 21a for discharging a molding material in a molten state conveyed by an extruder of the injection molding machine. Is formed. The discharge port 21c of the discharge hole 21a is opened at the center of the spherical projection 21b.

In the connection structure, when the spool bush 12 of the molding die 10a is connected to the discharge nozzle 21, the discharge nozzle 21 is operated by the hydraulic pressure of the injection molding machine.
Is received by the spherical concave portion 12b of the spool bush 12, and when the discharge nozzle 21 of the injection molding machine and the spool bush 12 of the molding die 10a are properly connected, the discharge nozzle 21 outlets 21c
And the inlet 12c of the spool bush 12 are opposed to each other and joined without any misalignment.

FIG. 1 shows a state in which the discharge port 21c of the discharge nozzle 21 and the introduction port 12c of the spool bush 12 are joined without misalignment. In this connection state, the spherical projection 21b of the discharge nozzle 21 is connected. The joining surface of the spool bush 12 and the spherical recess 12b prevents leakage of the molten molding material discharged from the discharge port 21c of the discharge nozzle 21.

[0008]

By the way, when the connecting structure is constructed, when the connecting operator connects the spool bush 12 of the molding die 10a and the discharge nozzle 21, the discharge port of the discharge nozzle 21 is required. The joining state between the inlet 21c and the inlet 12c of the spool bush 12 is to be checked each time. However, since this checking work is performed visually,
There is a problem that it cannot always be confirmed accurately. Further, during operation of the injection molding machine, there is a possibility that a misalignment may occur in a joint state between the discharge port 21c of the discharge nozzle 21 and the introduction port 12c of the spool bush 12 due to an action such as vibration.

In the connection structure, if a misalignment occurs in the joining between the ejection port 21c of the ejection nozzle 21 and the introduction port 12c of the spool bush 12, a gap may be formed between the joining surfaces of the spool bush 12 and the ejection nozzle 21. The inlet 12c of the spool bush 12 is partially closed. If a gap is formed between the joining surface of the spool bush 12 and the discharge nozzle 21, a molten molding material discharged from the discharge nozzle 21 leaks from this gap, impairing a normal molding operation, and introducing the spool bush 12. Mouth 12
c is partially closed, the discharge port 2 of the discharge nozzle 21
The molten molding material discharged from 1c is not accurately introduced into the introduction hole 12a of the spool bush 12, and a normal molding operation is impaired.

Accordingly, an object of the present invention is to provide a discharge nozzle 21
When the discharge nozzle of the injection molding machine and the introduction hole of the molding die such as the spool bush 12 are joined and connected, the discharge nozzle and the introduction hole can be joined without misalignment. The purpose is to be able to maintain stable.

[0011]

According to the present invention, a discharge nozzle of an injection molding machine is connected to an introduction hole of a molding die for introducing a molten molding material discharged from the discharge nozzle into the mold. Wherein the spherical convex portion of the discharge nozzle is received by the spherical concave portion of the introduction hole portion, and the introduction port of the introduction hole portion and the spherical convex portion which are opened in the spherical concave portion. A connection structure of a type in which the discharge ports of the discharge nozzles that are open to each other are connected in a joint state facing each other.

According to the connection structure of the present invention, the connection hole and the discharge nozzle are supported between the discharge nozzle and the introduction hole constituting the connection structure and the spherical shape of the discharge nozzle is provided. A positioning means for positioning the convex portion and the spherical concave portion of the introduction hole portion with each other is provided.

In the connecting structure according to the present invention, the positioning means is provided integrally with or fitted to the distal end of the introduction hole, and is fitted to the outer periphery of the discharge nozzle so that the discharge nozzle is located at the outer periphery. Comprising a support cylinder that supports from
It can be constituted by a support cylinder which is provided integrally with or fitted to the tip of the discharge nozzle, fits on the outer periphery of the introduction hole, and supports the introduction hole from the outer periphery. In these cases, the support cylinder may be screwed or spline-fitted to the outer periphery of the discharge nozzle or the outer periphery of the introduction hole.

In the connection structure according to the present invention,
The support cylinder is formed of a member that is screwed or spline-fitted to the outer circumference of the introduction hole and the outer circumference of the discharge nozzle so as to be able to advance and retreat, and the support cylinder is formed on the outer circumference of the introduction hole and the discharge nozzle. The two members may be connected to each other by screwing or spline fitting.

Still further, in the connection structure according to the present invention, the positioning means may include an insertion hole provided in one of the discharge nozzle and the introduction hole.
A projection may be provided on one of the other members of the discharge nozzle or the introduction hole and inserted into the insertion hole to connect the one member.

[0016]

In the connection structure according to the present invention, the discharge nozzle of the injection molding machine and the introduction hole of the molding die are connected via positioning means. The convex portion and the spherical concave portion of the introduction hole are positioned and joined to each other by the action of the positioning means. For this reason, the discharge port that opens to the spherical convex portion of the discharge nozzle and the inlet port that opens to the spherical concave portion of the introduction hole are accurately joined to each other, and the gap between the discharge port of the discharge nozzle and the introduction port of the introduction hole is formed. The occurrence of misalignment is prevented.

In the connection structure, the positioning means always keeps the discharge nozzle and the introduction hole in a state in which the discharge port and the introduction port are accurately joined, so that the injection molding machine can be operated during operation. In addition, there is no occurrence of misalignment between the discharge port of the discharge nozzle and the introduction port of the introduction hole due to vibration or the like.

Therefore, according to the connecting structure of the present invention,
The molding material in the molten state discharged from the discharge port of the discharge nozzle does not leak from between the joining surfaces of the discharge nozzle and the introduction hole, and is properly introduced into the introduction hole of the introduction hole, and the molding is performed normally. Work can be continued smoothly for a long time. Further, according to the connection structure, it is possible to easily and accurately connect the discharge port of the discharge nozzle and the introduction port of the introduction hole without misalignment without paying close attention to the connection work between the discharge nozzle and the introduction hole. Can be formed.

In order to implement the connecting structure according to the present invention having the above-mentioned effects, the following embodiments can be specifically adopted. That is, as a first aspect, the positioning means is provided integrally or fitted to the distal end of the introduction hole, and is fitted to the outer periphery of the discharge nozzle to support the discharge nozzle from the outer periphery. As a second aspect, the positioning means is provided integrally or fitted to the tip of the discharge nozzle, and fitted to the outer periphery of the introduction hole to form the introduction hole. As a third mode, a mode in which the support cylinder is configured to be screwed or spline-fitted to the outer circumference of the discharge nozzle or the outer circumference of the introduction hole, and a fourth mode is configured as a third mode. As the support cylinder, a member that is screwed or spline-fitted so as to be able to advance and retreat to the outer periphery of the introduction hole and the outer periphery of the discharge nozzle,
The supporting cylinder may be screwed or spline-fitted to the introduction hole and the outer periphery of the discharge nozzle to connect these two members to each other.

Further, as a fifth aspect, different from each of these aspects, the positioning means is provided with an insertion hole provided in one of the members of the discharge nozzle and the introduction hole,
It is also possible to adopt a mode in which a projection is provided on one of the other members of the discharge nozzle and the introduction hole and inserted into the insertion hole to connect the one member.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 2 shows a first connection structure according to the present invention. The connection structure corresponds to the first aspect of the present invention, and the spool bush 13 that forms the introduction hole of the injection molding die 10b (hereinafter, simply referred to as the die 10b) includes:
The bush body 13a includes a bush body 13a and a support tube 13b integrally formed at the tip of the bush body 13a. 13d. An introduction port 13e of an introduction hole 13c is opened at the center of the spherical recess 13d.

On the other hand, the discharge nozzle 21 on the injection molding machine side
A discharge hole 21a is provided at the axial center and a spherical convex portion 21b is provided at the tip.
1c is open at the center of the spherical projection 21b. The spherical convex portion 21b of the discharge nozzle 21 is
The third spherical concave portion 13d has a spherical shape corresponding to the spherical concave portion 13d, and is received and closely contacted by the spherical concave portion 13d. The discharge nozzle 21 is provided on the support cylinder 13 b of the spool bush 13.
In this state, the outer periphery thereof is supported by the cylindrical portion of the support cylinder 13b, and the spherical convex portion 21b is accurately received by the spherical concave portion 13d of the spool bush 13.

In the mold 10b, the discharge nozzle 21 is moved by the action of the hydraulic pressure of the injection molding machine to the spool bush 13
Is fitted and connected to the support cylinder 13b.
b supports the outer periphery of the discharge nozzle 21 when the tip end of the discharge nozzle 21 is fitted, and replaces the spherical convex portion 21b of the discharge nozzle 21 with the spherical concave portion 13d of the spool bush 13.
Position and receive. Therefore, the discharge port 21c of the discharge nozzle 21 and the introduction port 1 of the spool bush 13
3e is accurately joined to the discharge port 21 of the discharge nozzle 21.
The occurrence of misalignment between c and the inlet 13e of the spool bush 13 is prevented. Further, in the mold 10b, since the support cylinder 13b of the spool bush 13 always holds the connected discharge nozzle 21 from the outer peripheral side, the discharge nozzle 21 is not affected by vibration during operation of the injection molding machine. No misalignment occurs between the discharge port 21c and the introduction port 13e of the spool bush 13.

Therefore, according to the mold 10b, the molten molding material discharged from the discharge nozzle 21 does not leak from between the joining surfaces of the spool bush 13 and the discharge nozzle 21, and the introduction of the spool bush 13 is prevented. Hole 1
3c, the normal molding operation can be continued smoothly for a long time. In addition, according to the mold 10b, an accurate joining state in which the discharge port 21c of the discharge nozzle 21 and the introduction port 13e of the spool bush 13 do not have a misalignment without paying close attention in the connection work to the discharge nozzle 21. Can be easily formed.

FIG. 3 shows a second connection structure according to the present invention. The connecting structure is a modification of the first connecting structure of the present invention and constitutes a first aspect. In an injection molding die (hereinafter, simply referred to as a die 10c), the introduction hole is supported. It is composed of a cylinder 14 and a spool bush 15. The spool bush 15 is made of a conventional mold 10
The support cylinder 14 is the same as the spool bush 12 in FIG. 1A, and corresponds to the cylindrical portion of the support cylinder 13b constituting the mold 10b. The support cylinder 14 is fitted concentrically on the outer periphery of the spool bush 15, and the fitted tube has an open distal end.

In the mold 10c, the tip of the discharge nozzle 21 of the injection molding machine is fitted and connected to the support cylinder 14 fitted on the spool bush 15, but the support cylinder 14
When the spherical convex portion 21b of the discharge nozzle 21 is received by the spherical concave portion 15b of the spool bush 15, the outer periphery of the discharge nozzle 21 is supported, and the spherical convex portion 21b of the discharge nozzle 21 is spooled. Spherical recess 15b of bush 15
Position with respect to For this reason, the discharge port 21c of the discharge nozzle 21 and the introduction port 15c of the spool bush 15 are accurately joined, and the occurrence of misalignment between the discharge port 21c of the discharge nozzle 21 and the introduction port 15c of the spool bush 15 is prevented. You. Further, in the mold 10c, since the support cylinder 14 fitted to the spool bush 15 always holds the connected discharge nozzle 21 from the outer peripheral side,
The discharge nozzle 2 may also be affected by vibrations during operation of the injection molding machine.
1 outlet 21c and inlet 15 of spool bush 15
No misalignment occurs between c.

FIG. 4 shows a third connection structure according to the present invention. The connecting structure is a modification of the first connecting structure according to the present invention and constitutes the first aspect of the present invention. In the injection molding die (hereinafter, simply referred to as a die 10d), the connecting structure is introduced. The spool bush 16 forming the hole is
It is formed of a bush main body 16a and a support cylinder 16b integrally provided at the tip of the bush main body 16a. Like the spool bush 13, the spool bush 16 includes an introduction hole 16c, a spherical concave portion 16d, and an introduction port 16e, but the inner periphery of the support cylinder 16b is formed in a conical tapered surface 16f.

On the other hand, the discharge nozzle 22
Similarly to the above, a discharge hole 22a, a spherical convex portion 22b, and a discharge port 22c are provided, but a distal end corner of the outer periphery of the discharge nozzle 22 is formed on a tapered surface 22d having a shape corresponding to the tapered surface 16f of the spool bush 16. The tapered surface 22d is in close contact with the tapered surface 16f of the support cylinder 16b when the spherical convex portion 22b of the discharge nozzle 22 is received by the spherical concave portion 16d of the spool bush 16.

In the mold 10d, the distal end of the discharge nozzle 22 is fitted and connected to the support cylinder 16b of the spool bush 16 by the action of the hydraulic pressure of the injection molding machine. When the spherical convex portion 22b of the nozzle 22 is received by the spherical concave portion 16d of the spool bush 16, the tapered surface 22d of the discharge nozzle 22
The outer peripheral surface of the discharge nozzle 22 is supported in close contact with the tapered surface 16f of the spool bush 16 and the spherical convex portion 22b of the discharge nozzle 22 is positioned with respect to the spherical concave portion 16d of the spool bush 16.
Therefore, in the connection structure, the same operation and effect as the first connection structure can be obtained.

In the first, second, and third connection structures shown in FIGS. 2, 3, and 4, the support cylinder 13b,
14 and 16b are all spool bushes 13, 15,
16, but on the contrary, the support cylinder 13 b,
A support cylinder similar to the support cylinders 14 and 16b may be provided on the discharge nozzles 21 and 22 side.
Can be configured.

In the second connection structure shown in FIG. 3, a screw portion is formed on the entire inner periphery of the support cylinder 14, and a screw portion is also formed on the outer periphery of the spool bush 15 and the discharge nozzle 21. By screwing the cylinder 14 around the outer periphery of the spool bush 15 and the discharge nozzle 21, it is possible to deform the two so as to connect these two parts 15, 21. Such a configuration constitutes a fourth aspect of the present invention. Can be. In this case, the spool bush 15 and the discharge nozzle 21 are connected to each other by changing each screw portion to a spline portion and fitting the support cylinder 14 to the outer periphery of the spool bush 15 and the discharge nozzle 21 so as to advance and retreat. You can also

FIG. 5 shows a fourth connection structure according to the present invention. The connection structure is a modification of the second connection structure according to the present invention and constitutes a third aspect. In the injection molding die (hereinafter, simply referred to as a die 10e),
The introduction hole is formed by the support cylinder 14 and the spool bush 15, and the inner periphery of the support cylinder 14 at the distal end side is a thread 1
4a. On the other hand, the discharge nozzle 21 is formed such that the outer periphery of the distal end portion is formed in a screw portion 21d, and the discharge nozzle 21 is screwed and connected to the screw portion 14a of the support cylinder 14 with the screw portion 21d. Have been.

The connection structure has the same operation and effect as the second connection structure, but since the discharge nozzle 21 is screwed and connected to the support tube 14, the support tube 1 of the discharge nozzle 21 is connected.
4 is securely held without loosening. The other configuration is substantially the same as that of the second connection structure, and the same portions are denoted by the same reference numerals and description thereof will be omitted. In the connection structure, the two screw portions 14
By replacing a and 21d with spline portions, the support cylinder 14 and the discharge nozzle 21 may be spline-fitted.

FIG. 6 shows a fifth connection structure according to the present invention. The connecting structure is a modification of the fourth connecting structure according to the present invention and constitutes a second aspect. In an injection molding die (hereinafter, simply referred to as a die 10f),
Although the introduction hole is constituted by the spool bush 15, a support cylinder 23 is provided on the discharge nozzle 21 side.
The spool bush 15 has a tapered surface 15d at a tip corner on the outer periphery. On the other hand, the support cylinder 23 is screwed to the outer periphery of the discharge nozzle 21, and the inner peripheral surface on the tip side is formed as a tapered surface 23 a. Support tube 2
3 is formed on the spherical convex portion 2 of the discharge nozzle 21.
1b is received in the spherical recess 15b of the spool bush 15, the tapered surface 15d of the spool bush 15
Is closely related to

In the mold 10f, the support cylinder 23 provided on the discharge nozzle 21 is externally fitted to and connected to the spool bush 15 by the action of the hydraulic pressure of the injection molding machine. When the spool 21b is received by the spherical recess 15b of the spool bush 15, the tapered surface 23a of the support cylinder 23 comes into close contact with the tapered surface 15d of the spool bush 15, and the spherical projection 21b of the discharge nozzle 21 is spooled. It is positioned with respect to the spherical recess 15d of the bush 15. Therefore, in the connection structure, the same operation and effect as those of the fourth connection structure can be obtained. The other configuration is substantially the same as that of the fourth connection structure, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

FIG. 7 shows a sixth connection structure according to the present invention. The connecting structure is a modified example of the first connecting structure according to the present invention and constitutes a fifth aspect. In the mold 10g, the spool bush 13 forming the introduction hole is provided with a bush body 13a. And a plurality of protrusions 13f
It is composed of Each projection 13f is formed on an annular end face located outside the spherical recess 13d. Each projection 13f has a conical shape and protrudes forward by a predetermined length.

On the other hand, the discharge nozzle 2 constituting the injection molding machine
In 1, a plurality of insertion holes 21e are formed in an annular end face located outside the spherical convex portion 21b.
Each of the insertion holes 21e has a conical shape, is opposed to each of the projections 13f of the spool bush 13, and is used when the spherical projection 21b of the discharge nozzle 21 is received by the spherical recess 13d of the spool bush 13. , Spool bush 13
Each of the projections 13f is inserted.

In the mold 10g, each insertion port 21e provided in the discharge nozzle 21 by the action of hydraulic pressure of the injection molding machine.
The ejection nozzle 21 and the spool bush 13 are connected to each other by inserting the respective projections 13f of the spool bush 13 into the spool. In this case, the protrusions 13f of the spool bush 13 are inserted into the respective insertion openings 21e of the discharge nozzles 21 so that the spherical protrusions 21b of the discharge nozzle 21 are
With respect to the spherical concave portion 13d. Therefore, in the connection structure, the same operation and effect as the first connection structure can be obtained. For other configurations,
This is substantially the same as the first connection structure, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view showing a conventional connection structure between an introduction hole of an injection molding die and a discharge nozzle of an injection molding machine.

FIGS. 2A and 2B are a partially omitted cross-sectional view showing a first connection structure according to the present invention, and a cross-sectional view of a spool bush constituting the connection structure.

FIGS. 3A and 3B are a partially omitted cross-sectional view showing a second connection structure according to the present invention, a cross-sectional view of a support cylinder constituting the connection structure, and a front view of the support cylinder. is there.

FIG. 4 is a partially omitted cross-sectional view showing a third connection structure according to the present invention.

FIG. 5 is a partially omitted cross-sectional view showing a fourth connection structure according to the present invention.

FIG. 6 is a partially omitted sectional view showing a fifth connection structure according to the present invention.

FIG. 7 is a partially omitted cross-sectional view showing a sixth connection structure according to the present invention.

[Explanation of symbols]

10a, 10b, 10c, 10d, 10e, 10f, 1
0 g: mold for injection molding, 11: fixed mold, 12: spool bush, 12a: introduction hole, 12b: spherical recess, 12
c: introduction port, 13: spool bush, 13a: bush body, 13b: support cylinder, 13c: introduction hole, 13d ...
Spherical concave portion, 13e ... Inlet, 13f ... Protrusion, 14 ...
Support cylinder, 14a: screw part, 15: spool bush, 1
5a: introduction hole, 15b: spherical concave portion, 15c: introduction port,
15d: tapered surface, 16: spool bush, 16a ...
Bush body, 16b: support cylinder, 16c: introduction hole, 16
d: spherical concave portion, 16e: introduction port, 16f: tapered surface,
Reference numeral 21a: discharge hole, 21b: spherical convex portion, 21c: discharge port, 21d: screw portion, 21e: insertion hole, 22: discharge nozzle, 22a: discharge hole, 22b: spherical convex portion, 22c: discharge port, 22d ... taper surface, 23 ... support cylinder, 23a ... taper surface.

Claims (6)

[Claims] 1. A connection structure for connecting a discharge nozzle of an injection molding machine to an introduction hole of a molding die for introducing a molten molding material discharged from the discharge nozzle into a mold. The spherical convex portion of the discharge nozzle is received in the spherical concave portion of the introduction hole portion, and the introduction port of the introduction hole portion opening in the spherical concave portion and the discharge of the discharge nozzle opening in the spherical convex portion. In a connection structure for connecting an outlet and a joining state facing each other, between the discharge nozzle and the introduction hole, the introduction hole and the discharge nozzle are supported by each other, and the spherical convex portion of the discharge nozzle and the introduction A connection structure between a discharge nozzle of an injection molding machine and an introduction hole of a molding die, comprising positioning means for positioning the spherical concave portion of the hole with respect to each other. 2. The connecting structure according to claim 1, wherein said positioning means is provided integrally or fitted to a tip portion of said introduction hole, and is fitted to an outer periphery of said discharge nozzle to perform said discharge. A connection structure between a discharge nozzle of an injection molding machine and an introduction hole of a molding die, which is a support cylinder that supports the nozzle from the outer periphery. 3. The connecting structure according to claim 1, wherein said positioning means is provided integrally with or fitted to a distal end portion of said discharge nozzle, and is fitted to an outer periphery of said introduction hole to perform said introduction. A connection structure between a discharge nozzle of an injection molding machine and an introduction hole of a molding die, which is a support cylinder that supports the hole from the outer periphery. 4. The injection molding machine according to claim 2, wherein said support cylinder is screwed or spline-fitted to an outer periphery of said discharge nozzle or an outer periphery of said introduction hole. Connection structure between the discharge nozzle and the introduction hole of the molding die. 5. The connecting structure according to claim 2, wherein the support cylinder is a member that is screwed or spline-fitted to the outer periphery of the introduction hole and the outer periphery of the discharge nozzle so as to be able to advance and retreat. A connection structure between a discharge nozzle of an injection molding machine and an introduction hole of a molding die, wherein these members are connected to each other by being screwed or spline-fitted to the outer periphery of the introduction hole and the discharge nozzle. 6. The connecting structure according to claim 1, wherein said positioning means includes an insertion hole provided in one of said discharge nozzle and said introduction hole, and said discharge nozzle or said introduction hole. A discharge nozzle of an injection molding machine and an introduction hole of a molding die, comprising a projection provided on one of the other members and inserted into the insertion hole and connecting the one member. Connection structure.