Gas vent pin

Abstract

To provide a gas vent pin that does not require a special cleaning device, does not require discarding a tip part even if clogging occurs, can be disassembled and cleaned, and can be appropriately changed to a configuration that provides optimal conditions for gas venting.SOLUTION: A gas vent pin used as a constituent member of an injection molding die device, having a plurality of plates at a tip part, and allowing gas to pass through gaps between the plurality of plates, includes: a pin base end side body part attached to base end sides of the plurality of plates; a pin tip side body part for holding at least a part of the pin base end side body part and the plurality of plates; and fixing means for fixing the pin base end side body part and the pin tip side body part. By releasing the fixing means, the pin base end side body part and the pin tip end side body part can be separated, and the plurality of plates can be separated individually.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention mainly relates to pins such as ejector pins and sprue lock pins used in injection molding dies, which have a gas venting mechanism.

Background Art

[0002] Conventionally, in the process of injection molding, in order to remove gas such as air existing in the components of the injection molding die device (including the die and the components in the vicinity of the die) and gas generated when melting the resin material, a gas venting mechanism is provided in the components. In pins such as ejector pins and sprue lock pins used in the components of the injection molding die device, a gas venting mechanism can also be provided. Hereinafter, a pin having a gas venting mechanism is referred to as a gas venting pin.

[0003] As a gas venting pin, there is a gas venting pin that discharges gas generated in injection molding by providing a gas vent composed of a plurality of slits. The gas vent has a certain length from the end face on the cavity side of the die, communicates with a gas escape hole having a cross-sectional area larger than that of the gas vent and extending to the end face on the side opposite to the cavity side, and a gradient for discharging gas is provided from the gas vent inlet to the joint with the gas escape hole. Such a gas venting pin is known (for example, see Patent Document 1).

[0004] Also, a gas venting pin is known in which the tip portion does not have a slit shape, but the tip portion is detachably assembled to the base end portion, the base end portion and the tip portion each have a passage communicating with each other in the mounted state, and the tip portion is made of a porous material (for example, see Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The gas vent pin according to Patent Document 1 is configured by embedding and adhering a plurality of gas vent pieces by engraving in order to form a plurality of slits at the tip, and performing additional processing by laser welding and grinding.

[0007] In the case of the gas vent pin, clogging is likely to occur due to the solidified product of the molten resin component during long-term use. For the gas vent pin with such a configuration, it is difficult to eliminate the clogging. Although it is considered that reuse is possible by using a separately developed cleaning device (for example, Japanese Patent Laid-Open No. 2022-106260, etc.), there is a problem in that such a cleaning device is required.

[0008] On the other hand, as shown in Patent Document 2, when the tip portion of the pin is made of a porous material, it is difficult to clean the clogging of the tip portion made of the porous material. Therefore, it is disclosed that the tip portion is detachable and replaceable. Here, even if the detachable and replaceable configuration of Patent Document 2 is applied to Patent Document 1, ultimately, the clogged tip portion will be discarded, resulting in a large loss.

[0009] The present invention has been made in view of the above circumstances, and an object of the invention is to provide a revolutionary gas vent pin that does not require a special cleaning device, does not need to discard the tip portion even if clogging occurs, and can be disassembled and cleaned.

[0010] In Patent Document 1, the gas vent pin is formed by embedding and adhering a plurality of gas vent pieces by engraving in order to form a plurality of slits at the tip, and performing additional processing by laser welding and grinding. Therefore, it cannot be said that it is excellent in ensuring accuracy. Since the optimal conditions for the gas vent vary depending on the type of resin used in injection molding, etc., it is desired that the configuration can be appropriately changed to an optimal condition configuration.

[0011] Therefore, in addition to the above problems to be solved, the present invention aims to provide a gas vent pin that can be appropriately changed to a configuration that provides optimal conditions for the gas vent.

Means for Solving the Problems

[0012] The present invention is used as a component of an injection molding die apparatus, has a plurality of plates at the tip, and in a gas vent pin configured to allow gas to pass through the gaps between the plurality of plates, a pin base end side main body portion attached to the base end side of the plurality of plates, a pin tip side main body portion that holds at least a part of the pin base end side main body portion and the plurality of plates, and fixing means for fixing the pin base end side main body portion and the pin tip side main body portion. By releasing the fixing means, the pin base end side main body portion and the pin tip side main body portion can be separated, and the plurality of plates can be separated individually. A gas vent ejector pin is provided as means for solving the problems.

Effects of the Invention

[0013] According to the present invention, since the plurality of plates at the tip are provided so as to be separable individually, each plate can be cleaned, and clogging can be eliminated. Also, by using a plurality of plates that form a gap that provides optimal conditions for the gas vent, the optimal conditions for the gas vent can be realized appropriately.

Brief Description of the Drawings

[0014]

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Figure 13

Embodiments for Carrying Out the Invention

[0015] The gas vent pin according to an embodiment of the present invention is used as a component of an injection molding die apparatus, has a plurality of plates at its tip portion, and is a gas vent pin configured such that gas can pass through the gaps between the plurality of plates. The gas vent pin includes a pin base-side main body portion attached to the base end side of the plurality of plates, a pin tip-side main body portion that holds at least a part of the pin base-side main body portion and the plurality of plates, and fixing means for fixing the pin base-side main body portion and the pin tip-side main body portion. By releasing the fixing means, the pin base-side main body portion and the pin tip-side main body portion can be separated, and the plurality of plates can be separated plate by plate (first configuration).

[0016] According to the first configuration described above, since the plurality of plates at the tip portion are provided so as to be separable plate by plate, it becomes possible to wash each plate alone, and clogging can be eliminated. Further, by using a plate that forms a gap that provides optimal conditions for gas venting, it is possible to appropriately realize the optimal conditions for gas venting.

[0017] Further, in the above-described first configuration, the plate has a first groove portion that is continuous in the longitudinal direction on the first surface, and the gap is formed by the first groove portion of one plate and the second surface of the other plate by bringing the first surface of one plate into contact with the second surface of the other plate (second configuration).

[0018] According to the above-described second configuration, in addition to the effects of the above-described first configuration, a gap through which gas can pass can be formed in a state where the plates are in contact with each other, and the plates can be securely fixed. Further, by changing the width and depth of the first groove portion, plates with different gas passage conditions can be obtained, and the optimum conditions of the gas vent can be appropriately realized by selecting the plates.

[0019] Further, in the above-described second configuration, the plate has a second groove portion that is continuous in the width direction at least on the first surface, and has a first through hole in the second groove portion. The main body portion on the tip side of the pin has a second through hole, and the first groove portion forming space formed by the first groove portion, the second groove portion forming space formed by the second groove portion, the first through hole forming space formed by the first through hole, and the second through hole forming space formed by the second through hole form a continuous first flow path, and the gas introduced from the tip portion can be discharged to the side of the gas vent pin through the first flow path (third configuration).

[0020] According to the above-described third configuration, in addition to the effects of the above-described first configuration and second configuration, the gas introduced between the plurality of plates at the tip portion can be moved to the side of the gas vent pin through the first flow path and discharged to the outside of the component member through the gap with the sliding hole provided in the component member.

[0021] Further, in the above-described third configuration, the pin tip-side main body portion has a third groove portion continuous in the circumferential direction on its outer peripheral surface, the second through hole opens into the third groove portion, and further, a fourth groove portion is continuously provided in the longitudinal direction from the third groove portion. A third groove portion formation space formed between the third groove portion and the constituent member and a fourth groove portion formation space formed between the fourth groove portion and the constituent member form a continuous second flow path. The first flow path and the second flow path form a continuous third flow path, and the gas introduced from the tip end portion can be discharged through the third flow path (fourth configuration).

[0022] According to the above-described fourth configuration, in addition to the operational effects of the above-described third configuration, the gas can be efficiently guided to the base end side of the pin and discharged through the third flow path, that is, the flow path that moves from the first flow path into the third groove portion that is the second flow path and further moves from the side circumference of the gas venting pin to the fourth groove portion.

[0023] Further, in the above-described first to fourth configurations, the pin tip-side main body portion is provided with a first fitting hole, the pin base-end side main body portion is provided with a second fitting hole, and the fixing means can be configured to fit into the first fitting hole and the second fitting hole (fifth configuration).

[0024] According to the above-described fifth configuration, in addition to the operational effects of the above-described first to fourth configurations, the first fitting hole of the pin tip-side main body portion and the second fitting hole of the pin base-end side main body portion can be communicated and fixed by the fixing means. Further, the fixing means can be released (including detachment) from the first fitting hole and the second fitting hole.

Embodiment

[0025] Hereinafter, with reference to the drawings, the gas venting pin P according to an embodiment of the present invention will be described. The same or corresponding parts in the drawings are denoted by the same reference numerals and their descriptions will not be repeated. In order to make the description easier to understand, in the drawings referred to below, the configuration is shown in a simplified or schematic manner, or some configurations are omitted. Also, the dimensional ratios between the configurations shown in each drawing do not necessarily represent the actual dimensional ratios.

[0026] The gas vent pin P according to an embodiment of the present invention has a size of about 6 mm in diameter and 150 mm in length. As shown in FIGS. 1 and 2, it is composed of a plurality of plates 1, a pin tip side body portion 2, a pin base end side body portion 3, and fixing means 4. The gas vent pin P according to this embodiment has a Z-shaped sprue lock pin at the tip.

[0027] The plate 1 in this embodiment is a metal plate member with a thickness of about 0.3 mm, a length of 24 mm, and a width of about 3 mm, as shown in FIG. 3. The tip side is a flat plate having a flat end face at the tip of the sprue lock pin.

[0028] On the first surface 10A of the plate 1 shown in FIG. 3, a plurality of first grooves 11 are provided in parallel in the direction from the tip to the base end side (longitudinal direction). In this embodiment, four first grooves 11 are provided. The first grooves 11 are provided up to the position of the second groove 12. In addition, in the position from the second groove 12 to the base end portion of the plate 1, a shape similar to that of the first groove 11 may appear due to the manufacturing process, or it may be a smooth surface. Also, the second surface 10B, which is the back surface of the plate 1 not shown in FIG. 3, is a smooth surface without forming the first groove 11.

[0029] The second groove 12 is provided in the width direction at a position closer to the tip side of the plate 1. The second groove 12 is formed to extend 2 mm in width at a position about 5 mm from the tip of the plate 1. The second groove 12 is formed deeper than the first groove 11.

[0030] Also, a first through hole 13 with a diameter of about 1 mm is formed at the center position of the second groove 12.

[0031] The proximal end portion of the plate 1 is formed with a plate-side hook-shaped contour portion 14 having a hook-shaped contour. The plate-side hook-shaped contour portion 14 is a portion that functions as an engaging portion with the proximal end side main body portion 3 of the pin. The plate-side hook-shaped contour portion 14 is composed of a plate-side narrow-width portion 14A and a plate-side wide-width portion 14B that is continuous from the plate-side narrow-width portion 14A toward the proximal end side.

[0032] In this embodiment, eight plates 1 shown above are superposed.

[0033] In this embodiment, the four corners of the square shape, which is the opening contour of the holding hole 25, are strictly arc-shaped. For the plates 1a and 1b arranged at both ends among the superposed plates 1, chamfering with an R is performed according to the shape of the opening contour of the holding hole 25. That is, among the plates 1 arranged at both ends, one plate 1a is chamfered with an R at both ends on the first surface side, and the other plate 1b is chamfered with an R at both ends on the second surface side. The other six plates 1c are not chamfered with an R.

[0034] Next, the pin tip side main body portion 2 according to this embodiment will be described. The pin tip side main body portion 2 holds a plurality of plates 1 and a part of the pin base end side main body portion 3. The pin tip side main body portion 2 according to the embodiment is a substantially cylindrical member having a square hole-shaped holding hole 25 in the axial direction (longitudinal direction), and has a size of about 6 mm in diameter and 40 mm in length. The tip has a Z-shaped contour in a side view for hooking a sprue.

[0035] At a position corresponding to the first through hole 13 of the plate 1, that is, at a position close to the tip of the pin tip side main body portion 2 (a position about 5 mm from the tip), a second through hole 20 is provided. And on the outer peripheral surface having the second through hole 20, a third groove portion 21 is provided in the circumferential direction. In other words, the second through hole 20 opens into the third groove portion 21.

[0036] On the outer peripheral surface of the pin tip-side main body portion 2, a fourth groove portion 22 is provided longitudinally from the third groove portion 21 in which the second through hole 20 is formed, toward the base end. The fourth groove portion 22 is formed to have the same depth as the third groove portion 21.

[0037] Also, at a position closer to the base end in the longitudinal direction of the pin tip-side main body portion 2, it has a first fitting hole 23A and a third fitting hole 23B corresponding to the fixing means 4. Both the first fitting hole 23A and the third fitting hole 23B penetrate from the outside to the inner square hole 25 of the pin tip main body portion 2. Also, the third fitting hole 23B is provided at a position symmetric with respect to the rotation axis S of the first fitting hole 23A and the tip main body portion 2 of the shaft tip. For this reason, the first fitting hole 23A and the third fitting hole 23B are provided at 180-degree intervals with respect to the central axis S in a plan view. A minute anti-backflow protrusion 24A is formed at one location on the inner surface of the first fitting hole 23A. Also, minute anti-loosening protrusions 24B are formed at four locations on the inner surface of the third fitting hole 23B. The first fitting hole 23A is a fitting hole on the inlet side when fitting the fixing means 4, and the third fitting hole 23B is a fitting hole on the opposite side (outlet side).

[0038] Next, the pin base-end side main body portion 3 according to this embodiment will be described. As shown in FIG. 5, the base-end side main body portion 3 has a pin head portion 30 at the base end, a columnar portion 31 continuous from the pin head portion 30 to the tip side, a prismatic tip columnar portion 32 continuous from the columnar portion 31 to the tip side, and a main body side hook-shaped contour portion 33 formed at the tip of the tip columnar portion 32. The main body side hook-shaped contour portion 33 is composed of a main body side narrow-width portion 33A and a main body side wide-width portion 33B continuous from the main body side narrow-width portion 33A to the tip side. A step portion 35 is formed at the boundary between the columnar portion 31 and the tip columnar portion 32. Also, a second fitting hole 34 corresponding to the fixing means 4 is provided on the side surface of the tip columnar portion 32 so as to open. The distance from the step portion 35 to the second fitting hole 34 is the same as the distance from the base end of the pin tip-side main body portion 2 to the first fitting hole 23A.

[0039] The outer diameter dimension of the cylindrical portion 31 is 6 mm, which is approximately the same as the outer diameter dimension of the pin tip side main body portion 2. Further, the tip columnar portion 32 has a rectangular shape in which the outer contour dimensions of the cross section in the width direction are common to the plurality of plates 1 that are polymerized, and all have shapes and dimensions that fit into the holding hole 25 of the pin tip side main body portion 2.

[0040] The fixing means 4 according to the present embodiment is a metal key. In the present embodiment, as shown in FIGS. 6(a) to (d), it generally has a rectangular parallelepiped shape. On the surface, a concave portion 40 that is continuous in the insertion direction and a flat portion 41 where the concave portion 40 is not formed are continuously formed. Note that the omitted bottom view has the same shape as the (c) plan view, and the omitted right side view is symmetric with the (d) left side view about the left and right. For this reason, since the shapes of the front (plane) side and the back (bottom) side are the same, it has a shape that can be inserted into the first fitting hole 23A even when the front and back are reversed.

[0041] With the plate 1, the pin tip side main body portion 2, the pin base end side main body portion 3, and the fixing means 4 having the above configuration, the gas vent pin P according to the present embodiment can be assembled by the following procedure.

[0042] First, as shown in FIG. 7, a plurality of mutually congruent plates 1 are abutted and polymerized. By polymerizing the plurality of plates 1, a first through hole forming space is formed in the thickness direction by the first through hole 13, and between each plate 1, a first groove forming space 11A that is a longitudinal gap by the first groove portion 11 and a second groove forming space 12A that is a widthwise gap by the second groove portion 12 are formed. Further, on the base end side of the plurality of polymerized plates 1, a plate side hook-shaped contour portion 14 is configured to have a thickness corresponding to the plurality of sheets. As a result, the first groove forming space 11A, the second groove forming space 12A, and the first through hole forming space 13A become a continuous space. Note that the plates 1 only need to be abutted and polymerized with each other, and mutual adhesion or the like is not performed.

[0043] Next, as shown in FIG. 8, the plate-side hook-shaped contour portion 14 (i.e., the engaging portion on the side of the plate 1) and the main body-side hook-shaped contour portion 33 of the pin base-end side main body portion 3 (i.e., the engaging portion of the pin base-end side main body portion 3) are engaged. Specifically, the engagement is performed such that the plate-side narrow-width portion 14A abuts against the main body-side wide-width portion 33B, and the plate-side wide-width portion 14B abuts against the main body-side narrow-width portion 33A. The engagement can be achieved by relatively sliding them with respect to each other in the thickness direction. By engaging the plurality of plates 1 and the pin base-end side main body portion 3, the plurality of plates 1 and the tip columnar portion 32 of the pin base-end side main body portion 3 are arranged so as to form a single prism.

[0044] Then, as shown in FIG. 9, the pin tip-side main body portion 2 is fitted from the tip side of the pin base-end side main body portion 3 with which the plurality of plates 1 are engaged. The base end of the pin tip-side main body portion 2 is brought into contact with the stepped portion 35 of the pin base-end side main body portion 3. Since the distance from the stepped portion 35 to the second fitting hole 34 is the same as the distance from the base end of the pin tip-side main body portion 2 to the first fitting hole 23A, the first fitting hole 23A and the second fitting hole 34 are in an overlapping position. Also, it is assumed that the distance from the stepped portion 35 to the first through-hole 13 of the plate 1 is the same as the distance from the base end of the pin tip-side main body portion 2 to the second through-hole 20. For this reason, the first through-hole 13 and the second through-hole 20 are in an overlapping position. In other words, the first through-hole forming space 13A (the space formed by the first through-hole 13) and the second through-hole forming space 20A (the space formed by the second through-hole 20) are connected. In this state, the tips of the plurality of plates are exposed from the tip of the holding hole 25.

[0045] Furthermore, as shown in FIG. 9, the fixing means 4 is sequentially fitted into the first fitting hole 23A, the second fitting hole 34, and the third fitting hole 23B from the side of the first fitting hole 23A. The minute projection 24A of the first fitting hole 23A slides into the concave portion 40 of the fixing means 4 and rides over the flat portion 41 to prevent the fixing means 4 from returning. Also, the minute projection 24B of the third fitting hole 23B prevents the insertion side of the fixing means 4 from coming out of the third fitting hole 23B. By the above procedure, the gas vent pin P according to the present embodiment is configured.

[0046] When disassembling the gas vent pin P according to this embodiment, it can be performed by the reverse procedure of the above assembly procedure.

[0047] That is, first, the removal operation of the fixing means 4 is performed. The removal of the fixing means 4 is performed by pressing the fixing means 4 from one side of the third fitting hole 23B with a rod-shaped object (not shown) serving as a jig, and pushing out the fixing means 4 from the other first fitting hole 23A at the 180-degree position (the opposite side).

[0048] Next, the main body portion 2 on the tip side of the pin is slid in the longitudinal direction to be detached from the main body portion 3 on the base end side of the pin.

[0049] Then, the plurality of exposed plates 1 are slid in the thickness direction and can be removed from the main body portion 3 on the base end side of the pin.

[0050] The gas venting path of the gas vent pin P according to the embodiment shown above will be described below.

[0051] As shown in FIGS. 10 and 11, gas is introduced from a gap opening at the tip side of the plate 1 (that is, a gap formed by the first groove portion 11 formed on the first surface 10A of one plate 1 and the second surface 10B of another plate 1 in contact therewith, that is, the first groove portion forming space 11A). Since the first groove portion 11 and the second groove portion 12 communicate with each other, the gas moves to a gap formed by the second groove portion 12 (that is, a gap formed by the second groove portion 12 formed on the first surface 10A of one plate 1 and the second surface 10B of another plate 1 in contact therewith, that is, the second groove portion forming space 12A), and further moves to the first through-hole forming space 13A of the first through-hole 13 opening to the second groove portion 12. Thereafter, the gas moves to the second through-hole forming space 20A of the second through-hole 20 disposed overlapping the first through-hole 13, and from the side of the gas vent pin P to the external third groove forming space 21A (the space formed by the third groove 21 and the inner surface of the sliding hole 50 of the component 5 of the injection molding die apparatus) and the fourth groove forming space 22A (the space formed by the fourth groove 22 and the inner surface of the sliding hole 50 of the component 5 of the injection molding die apparatus), and is discharged outside the component 5.

[0052] Although the gas vent pin P according to the embodiment of the present invention has been described above, the present invention is not limited to the configuration of the above embodiment. For example, in the above embodiment, the sprue lock pin is exemplified as the gas vent pin P, but it is not limited to the sprue lock pin and can also be an ejector pin or the like. Therefore, the shape of the tip of the gas vent pin P can be a shape corresponding to the use of the gas vent pin P as illustrated in FIGS. 12 and 13. Note that FIGS. 12 and 13 are merely illustrative, and the present invention extends to embodiments appropriately modified within the scope of its technical idea.

[0053] Also, the ratio, size, etc. of each part of the gas vent pin P are not limited to the above embodiment.

[0054] Also, the number of plates 1 of the gas vent pin P is 8 in the above embodiment, but it is not limited thereto, and may be 7 as disclosed in FIGS. 12 and 13, or other numbers. In this embodiment, the shape of the plates 1 of the gas vent pin P is such that the shapes of the plates (1a) and (1b) at both ends among the plates 1 to be polymerized are chamfered to have a shape different from that of the other plates (1c). However, in the present invention, all the plates 1 may be completely identical. Also, in the present invention, it is possible to use a plurality of plates 1 having completely different shapes from each other.

[0055] Moreover, according to the present invention, even when the tip is a Z-shaped sprue lock pin, by adopting a configuration in which the end portion of the plate 1 is exposed over substantially the entire tip surface as shown in FIGS. 12(a) and 13(b), gas can pass through substantially the entire tip surface of the sprue lock pin. Therefore, efficient gas discharge can be achieved.

[0056] Also, as a structure for preventing the fixing means 4 from returning and coming off, in the above embodiment, the fixing means 4 is provided with a concave portion 40 and a flat portion 41, the first fitting hole 23A is provided with a protrusion 24A, and the third fitting hole 23B is provided with a protrusion 24B. However, the present invention is not limited to this configuration, and it is also possible to adopt a configuration in which minute protrusions are provided on the fixing means 4 side and concave portions or the like corresponding to the first fitting hole 23A or the third fitting hole 23B are provided. Further, it is also possible to prevent accidental return and removal of the fixing means 4 by appropriately determining the fitting tolerance without providing protrusions or the like.

[0057] Also, in the above embodiment, the fixing means 4 uses a key, but the present invention is not limited to this, and it can also be a small pin.

Explanation of Reference Numerals

[0058] G Gas flow direction P Gas vent pin 1 Plate 1a Plate (with chamfering on the first surface) 1b Plate (with chamfering on the second surface) 1c Plate (without chamfering) 10A First surface 10B Second surface 11 First groove 11A First groove formation space 12 Second groove 12A Second groove formation space 13 First through hole 13A First through hole formation space 14 Plate-side hook-shaped contour 14A Plate-side narrow portion 14B Plate-side wide portion 2-pin tip-side body part 20 Second through-hole 20A Second through-hole formation space 21 Third groove part 21A Third groove part formation space 22 Fourth groove part 22A Fourth groove part formation space 23A First fitting hole 23B Third fitting hole 24A Protrusion 24B Protrusion 25 Holding hole 3-pin base-end side body part 30 Pin head 31 Cylindrical part 32 Tip cylindrical part 33 Body-side hooked contour part 33A Body-side narrow part 33B Body-side wide part 34 Second fitting hole 35 Step part 4 Fixing means 40 Concave part 41 Flat part 5 Constituent member 50 Sliding hole

Claims

1. A vent pin used for a component of an injection molding die device, having a plurality of plates at its tip, and allowing gas to pass through the gaps between the plurality of plates, wherein: a pin base-side main body portion attached to the base end side of the plurality of plates; a pin tip-side main body portion that holds at least a part of the pin base-side main body portion and the plurality of plates; fixing means for fixing the pin base-side main body portion and the pin tip-side main body portion; is provided, by releasing the fixing means, the pin base-side main body portion and the pin tip-side main body portion can be separated, and the plurality of plates can be separated plate by plate. The vent pin is characterized by this.

2. The plate has a first groove portion continuous in the longitudinal direction on a first surface, and the gap is formed by the first groove portion of one plate and the second surface of the other plate by abutting the first surface of one plate and the second surface of the other plate. The vent pin according to claim 1, characterized by this.

3. The plate has at least a second groove portion continuous in the width direction on a first surface, and has a first through hole in the second groove portion, the pin tip-side main body portion has a second through hole, a first groove portion forming space formed by the first groove portion, a second groove portion forming space formed by the second groove portion, a first through hole forming space formed by the first through hole, and a second through hole forming space formed by the second through hole form a continuous first flow path, and the gas introduced from the tip is discharged through the first flow path. The vent pin according to claim 2, characterized by this.

4. The pin tip-side main body portion has a third groove portion continuous in the circumferential direction on its outer peripheral surface, the second through hole opens into the third groove portion, and further has a fourth groove portion continuous in the longitudinal direction from the third groove portion, a third groove portion forming space formed between the third groove portion and the component, and a fourth groove portion forming space formed between the fourth groove portion and the component form a continuous second flow path, and the first flow path and the second flow path form a continuous third flow path, and the gas introduced from the tip is discharged through the third flow path. The vent pin according to claim 3, characterized by this.

5. The pin tip side main body portion is provided with a first fitting hole, the pin base end side main body portion is provided with a second fitting hole, and the fixing means is fitted into the first fitting hole and the second fitting hole. The gas vent pin according to any one of claims 1, 2, 3, or 4, characterized in that.

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