JP6871090B2 - Drilling method and drilling jig - Google Patents

Description

The present invention relates to a perforation method for perforating a hollow portion of a seal member and a perforation jig used in the perforation method.

A seal member that is attached to the opening of an automobile or the like and at least one peripheral edge of an opening / closing member that opens / closes the opening and that seals between the opening and the opening / closing member by pressing against the other when the opening / closing member is closed is vulcanized. Using a material such as a rubber material, a thermoplastic elastomer, or a thermoplastic resin, almost the entire circumference is formed into a long length with the same cross section or substantially the same cross section by a continuous extrusion method. In the portion where the seal member is in pressure contact with the other, the cross section of the portion is often formed into a hollow shape for the purpose of obtaining a sufficient repulsive force and suppressing a decrease in the repulsive force with time. Here, when the cross section of the above portion is formed into a hollow shape by the continuous extrusion method, it is necessary to keep the air pressure inside the hollow constant in order to stably extrude the portion into a constant shape.

However, as the extrusion process progresses, the overall length of the product increases and the volume inside the hollow increases, while the hollow opening at the tip of the product, which is the only air inlet to the inside of the hollow, has a constant opening area and from the extruder outlet. Go away. For this reason, the inflow of air into the hollow is gradually delayed, and the internal pressure of the hollow becomes lower than the external pressure, resulting in a shape in which the hollow shape is withered. This phenomenon becomes more pronounced as the extrusion speed increases.

On the other hand, when the molding material of the sealing member is foamed vulcanized rubber, as described in Patent Document 1, the foamed gas inside the hollow is continuously performed in the foaming vulcanization step immediately after extruding the unvulcanized rubber from the extruder. Occurs. At this time, similarly to the above, the foam gas discharge port from the inside of the hollow is only the hollow opening at the tip of the product, the gas discharge gradually becomes in time, and the hollow internal pressure becomes higher than the external pressure, so that the hollow-shaped portion swells. It will be molded in the state. As described above, there are various factors that affect the hollow internal pressure in each region in the extrusion process.

Therefore, in order to keep the air pressure inside the hollow constant constant, as described in Patent Document 1, a device for ventilating the inside of the hollow through a mouthpiece is incorporated in the head of the extruder. As a result, the hollow internal pressure can be stabilized to some extent, but the head portion configuration of the extruder becomes complicated and large-scale.

Separately from this, after the material leaves the extruder, the hollow portion is intermittently perforated using a needle, a drill or the like. As a result, the inside and the outside of the hollow can be communicated with each other, and the internal pressure of the hollow can be easily brought close to the outside air pressure and the internal pressure can be kept constant.

The above is a problem related to the hollow internal pressure generated in the manufacturing process of the seal member, but apart from this, when the completed seal member is attached to the opening or the opening / closing member and used, the air inside the hollow is discharged to the outside. If it is difficult, as described in Patent Document 2, the hollow portion is not easily deformed, and the repulsive force of the seal member becomes extremely high when the opening / closing member is closed, so that the door is not sufficiently closed. Therefore, in order to secure the air discharge port, the hollow portion is intermittently perforated. As described above, in order to adjust the hollow internal pressure in the manufacturing process and the product, perforation in the hollow portion in the continuous extrusion process is a necessary step.

By the way, it is desirable that the position of the hole when drilling the hollow portion of the seal member is away from the seal portion of the hollow portion in order to avoid adverse effects on the sealing property, or away from the appearance portion in consideration of appearance. .. However, when the needle or drill is inserted into the hollow portion other than the pressure contact portion or the appearance portion, other parts of the sealing member may interfere with each other on the penetration trajectory of the needle or drill.

For example, Patent Documents 3 and 4 describe a door weather strip having a common cross-sectional shape, which is attached to the peripheral edge of a side door of an automobile and seals between the side door opening and the door weather strip. The door weather strip of Patent Document 3 connects the hollow portion and the mounting portion at one place on a semicircular hollow portion having an arc shape and a straight shape, a mounting portion to the door, and an extension line of the arc shape of the hollow portion. It is composed of connecting parts. The arc shape of the hollow portion is extended only on one side, and the end portion of the extension portion is connected to the mounting portion, and the other and the mounting portion are open.

Further, Patent Document 3 describes how a hole is formed from the side of the arc-shaped portion which is the sealing portion of the hollow portion. If a needle or a drill is to be inserted from the side of the linear shape portion away from the arc-shaped portion, the mounting portion interferes on the penetration trajectory.

Japanese Unexamined Patent Publication No. 2010-126040 (published on June 10, 2010) JP-A-2010-248620 (published on November 4, 2010) European Patent Publication No. 1502844 (published February 2, 2005) China Utility Model Announcement No. 2026008018 (announced on December 19, 2012)

Needles and drills can be easily penetrated into the hollow portion before the vulcanized rubber is vulcanized or before the thermoplastic elastomer or thermoplastic resin is cooled and solidified, in a state where it is easily plastically deformed. When an attempt is made to invade a needle or drill toward the linear shape portion in the hollow portion of Patent Document 3, as a result of first hitting the mounting portion that interferes on the intrusion trajectory, plastic deformation is possible due to the action of the force of the needle or drill. One connecting portion connecting the hollow portion and the mounting portion in a state of being in a state of being in a state of being easily deformed. In addition, unnecessary holes are opened in the mounting portion.

On the other hand, in the door weather strip of Patent Document 4, a hole is made by inserting a hole making device into the linear shape side of the hollow part via the mounting part inside the head inner mouthpiece of the extruder, and then the member is used. The inflowing material closes the hole in the mounting part. Since the material is perforated while passing through the mouthpiece, it is possible to prevent the one connecting part connecting the hollow part and the mounting part from being deformed even if the material is easily plastically deformed. it can. However, if a hole-drilling device or a flow path for closing the hole made in the mounting portion is incorporated inside the mouthpiece, the head portion configuration of the extruder becomes complicated and large-scale.

Further, in Patent Documents 3 and 4, the mounting surface which is a part of the sealing member interferes on the invasion path of the needle or the drill which invades the hollow portion. The manufacturing equipment that constitutes the extrusion process may interfere on the intrusion route. In that case, it is not possible to pierce by a linear reciprocating motion in the longitudinal direction of the needle or drill.

The present invention has been made in view of each of the above problems, and an object of the present invention is to reliably and easily make a hole in a hollow portion even when the sealing member is not deformed or the installation of a drilling jig is restricted. Is to realize a way to open.

In order to solve the above problems, the perforation method according to one aspect of the present invention is a perforation method for perforating the hollow portion when a seal member having a hollow portion is manufactured by a continuous extrusion method, and the seal member. A drilling jig is installed on a path through which the extruded product is conveyed after the molding material of the above has exited the mouthpiece of the extruder. The perforation obstacle is within the minimum installable range when a device for perforating by linearly reciprocating a perforation device for perforation in the longitudinal direction is virtually installed on the outside of the hollow portion at a distance from the perforation site. The space covered by the perforation portion and the perforation obstacle has an opening, and the perforation jig includes a holding portion, a rotating shaft portion, and a needle-like portion, and the perforation is provided. The entire jig is installed on the path via the holding portion, the rotating shaft portion is held on the holding portion, and the central axis of rotation in the longitudinal direction of the rotating shaft portion. As a result, the needle-shaped portion can be rotated while being held on the holding portion, and one end of the needle-shaped portion is fixed so as to intersect the extending direction of the central axis of the needle-shaped portion. The other end of the needle-shaped portion is sharp, and when the rotation shaft portion rotates, the other end side of the needle-shaped portion moves on the circumference with the central axis as the center of the circle. With the plane formed by the rotating shaft portion and the needle-shaped portion facing the surface of the perforated portion, at least a part of the rotating shaft portion and the entire needle-shaped portion can be covered. , It is inserted into the space through the opening and installed in a drilling standby state, and when the rotating shaft portion rotates, the other end side of the needle-shaped portion penetrates into the hollow portion and drills.

When virtually installing a device for drilling needles, drills, etc. by linearly reciprocating a drilling device (corresponding to a needle-shaped part) in the longitudinal direction, there is a drilling obstacle within the minimum installable range. Therefore, the device cannot actually be installed.

In that respect, according to the above configuration, at least a part of the rotating shaft portion and the needle are in a state where the plane formed by the rotating shaft portion and the needle-shaped portion of the drilling jig faces the surface of the drilling portion of the hollow portion. By inserting the entire shape into the same space through the opening of the space formed by the perforation site and the perforation obstacle, the perforation jig can be installed in the perforation standby state without interfering with the perforation obstacle. Is possible. Therefore, when the rotating shaft portion rotates, the pointed side (the other end side) of the needle-shaped portion can penetrate into the hollow portion to perform drilling, and the drilling jig can be used as a drilling obstacle even in this drilling process. Does not interfere with.

Further, in order to solve the above-mentioned problems, in the drilling method according to one aspect of the present invention, at least the punched portion of the sealing member is formed of either vulcanized rubber, thermoplastic elastomer, or thermoplastic resin. The perforation may be performed in a state where the molding material can be plastically deformed after the molding material exits the mouthpiece. According to the above configuration, since the molding material of the seal member is in a state of being plastically deformable, the rotational movement of the rotating shaft portion causes the needle-shaped portion to enter the hollow portion on the sharp side (the other end side). It will be easier.

Further, in order to solve the above-mentioned problems, the drilling method according to one aspect of the present invention is described when at least a part of the rotating shaft portion and the entire needle-shaped portion are inserted into the space and installed. The longitudinal direction of the needle-shaped portion may be parallel to the extrusion direction of the molding material. According to the above configuration, the resistance of the needle-shaped portion to the molding material when invading the perforated portion of the hollow portion is lowered, and the perforation becomes easier.

Further, in order to solve the above-mentioned problems, in the drilling method according to one aspect of the present invention, the rotating shaft portion rotates and the other end side of the needle-shaped portion penetrates into the hollow portion. After drilling, the rotating shaft portion further rotates and the other end side protrudes from the inside of the hollow portion to the outside of the hollow portion, so that the flat surface formed by the rotating shaft portion and the needle-shaped portion is formed. This step may be repeated by facing the surface of the perforation site and entering the perforation standby state again. According to the above configuration, the hollow portion can be continuously perforated intermittently.

Further, in order to solve the above problems, in the drilling method according to one aspect of the present invention, the sealing member is an automobile door weather strip, and the drilling obstacle constitutes a part of the sealing member. , It is preferable that it is a mounting portion for an automobile door.

According to the above configuration, it is possible to reliably and easily make a hole in a hollow portion of an automobile door weather strip that avoids a hollow pressure contact portion while avoiding interference from an attachment portion to the automobile door. it can.

Further, in order to solve the above problems, in the drilling method according to one aspect of the present invention, it is preferable that the drilling obstacle constitutes a part of a manufacturing apparatus for manufacturing the seal member by the continuous extrusion method. .. According to the above configuration, when drilling a hollow portion, the hole can be reliably and easily drilled in a state where interference from the manufacturing apparatus is avoided.

Further, in order to solve the above-mentioned problems, in the drilling jig according to one aspect of the present invention, when a seal member having a hollow portion is manufactured by a continuous extrusion method, the molding material of the seal member is the base of the extruder. A drilling jig installed on a path through which the extruded product is conveyed, and at least within the installation range of the drilling jig on the path, on the outside of the hollow portion of the drilling portion of the hollow portion. The perforation obstacle covers the perforation obstacle within the minimum installable range when a device for perforating by linearly reciprocating the perforation device for perforation in the longitudinal direction at a distance from the perforation site is virtually installed. The space formed by the drilling portion and the drilling obstacle has an opening, and the drilling jig includes a holding portion, a rotating shaft portion, and a needle-shaped portion. Installed on the path via the holding portion, the rotating shaft portion is held on the holding portion, and the rotating shaft portion is placed on the holding portion with the longitudinal direction of the rotating shaft portion as the central axis of rotation. One end of the needle-shaped portion is fixed so as to intersect the extending direction of the central axis of the needle-shaped portion, and the other end of the needle-shaped portion is fixed. Is sharp, and by rotating the rotation shaft portion, it is possible to perform a rotational movement in which the other end side of the needle-shaped portion moves on the circumference with the central axis as the center of the circle. With the plane formed by the rotating shaft portion and the needle-shaped portion facing the surface of the perforated portion, at least a part of the rotating shaft portion and the entire needle-shaped portion can be seen from the opening. It is inserted into a space and installed in a state of waiting for drilling, and when the rotating shaft portion rotates, the other end side of the needle-shaped portion penetrates into the hollow portion and drills.

According to the above configuration, by using the drilling jig, it is possible to reliably and easily drill a hole in the hollow portion of the seal member while avoiding interference from the drilling obstacle.

According to one aspect of the present invention, a hole can be reliably and easily drilled in the hollow portion of the seal member while avoiding interference from the drilling obstacle.

(A) is a diagram showing a schematic configuration of a front door of an automobile to which a door outer weather strip manufactured by the manufacturing method according to the first embodiment of the present invention is attached, and (b) is a diagram of (a). The cross-sectional view of the door outer weather strip with the AA line enlarged, (c) shows a case where a device for perforating a hollow portion by linearly reciprocating a needle, a drill, etc. in the longitudinal direction is virtually installed. It is a figure which shows the minimum installable range. It is the schematic of the continuous extrusion process in the drilling method which concerns on one aspect of this invention, (a) is the extrusion process which concerns on 1st Embodiment of this invention when the molding material is a vulcanized rubber, (b). ) Is an extrusion step according to the first embodiment of the present invention when the molding material is a thermoplastic elastomer or a thermoplastic resin material, and (c) is an extrusion step according to the second embodiment of the present invention. is there. The drilling jig according to the first embodiment of the present invention, (a) is a bird's-eye view of a state in which the drilling jig is attached to a mouthpiece outlet, and (b) is a rotation shaft of the drilling jig. The view of the portion and the needle-shaped portion viewed from the direction I of (a), (c) is a view of the rotating shaft portion and the needle-shaped portion viewed from the direction II of (a). Regarding the drilling jig installed in the product transport path, (a) is a bird's-eye view, (b) is a drilling standby state, (c) is a drilling state, and (d) is a schematic view of a re-drilling standby state. Regarding the drilling jig, the rotation shaft portion rotates and the needle-shaped portion penetrates from the drilling standby state to the middle of the wall thickness of the drilling portion of the hollow portion, and (a) shows the drilling standby state. The figure when the needle-shaped part faces the extrusion direction, (b) is the figure when it faces the direction opposite to the extrusion direction. It is sectional drawing of the extrusion molding part of the door outer weather strip manufactured by the manufacturing method which concerns on 2nd Embodiment of this invention. It is a figure which shows the state which the needle-shaped part of the drilling jig has penetrated into the drilling part of the hollow part in the continuous extrusion process in the drilling method which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the other example of the seal member for automobiles to which the manufacturing method which concerns on one aspect of this invention can apply.

[First Embodiment]
<Door outer weather strip>
First, the door outer weather strip 1 manufactured by the manufacturing method according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1A is a side view showing a schematic configuration of an automobile front door 101 of an automobile 100 to which the door outer weather strip 1 is attached. FIG. 1B is a cross-sectional view showing a schematic configuration of an extrusion-molded portion 1a of the door outer weather strip 1.

As shown in FIG. 1A, the door outer weather strip 1 (seal member, automobile door weather strip) is attached to the front door 101 (automobile door) of the automobile 100 or the peripheral edge of a rear door (not shown). , Seal between the peripheral edge and the peripheral edge of the door opening 102.

As shown in FIG. 1B, the extruded portion 1a of the door outer weather strip 1 has a hollow portion 15 and an attachment portion 16 to the front door 101 (a perforation obstacle, an attachment portion forming a part of a seal member). ), And a connecting portion 17. The hollow portion 15 is composed of a perforated portion 15a in which the hole 20 is perforated and an arc-shaped sealing portion 15b that press-contacts the peripheral edge portion of the door opening 102.

In FIG. 1A, the perforated portion 15a has a linear shape, but may have a curved shape. Further, although the perforation portion 15a and the seal portion 15b are connected at both ends of the perforation portion 15a, the connection between the two is limited to one point, and another straight line or curve is used between the other ends that are not connected to each other. You may connect.

The connecting portion 17 is a hollow portion connecting point 15c, which is one of two connecting points connecting both ends of the perforated portion 15a and the sealing portion 15b, and a hollow inside the end portions of the two mounting portions 16. It is connected to the end portion 16a of the mounting portion, which is closer to the portion connection point A. The hollow portion connection point 15d and the end portion 16b of the mounting portion 16 are not connected and are open. There is a gap of about 3 to 5 mm between the perforated portion 15a of the hollow portion 15 and the mounting portion 16.

FIG. 1 (c) shows the minimum installation in the case of virtually installing a device for perforating a hollow portion 15 by linearly reciprocating a needle, a drill, or the like (perforation device for perforation) in the perforation portion 15a in the longitudinal direction. It shows the possible range. When the above device is virtually installed, the minimum installable range is the advancing / retreating speed of the needle or drill, the presence or absence of rotation of the needle or drill in the axial direction, the wall thickness of the drilled part, the viscosity of the material, and the hardness. Although it depends on the shape and size of the hollow, it is mainly affected by the size of the cylinder that advances and retreats the needle and drill.

When the minimum installable range when the above device is virtually installed is expressed by the distance from the drilling surface of the drilling portion 15a of the hollow portion 15, it is about 20 mm when using a small (length about 10 mm) cylinder, and is medium-sized. When a cylinder (length of about 50 mm) is used, about 100 mm is required. Within this minimum installable range, the mounting portion 16 is covered with the hollow portion 15 separated from the drilling portion 15a, which hinders the drilling. Therefore, the above-mentioned virtual device is the drilling according to one aspect of the present invention. It cannot actually be installed in the method.

The seal portion 15b of the hollow portion 15 is a main portion that presses against the peripheral edge of the door opening 102 to seal between the peripheral edge of the front door 101 and the peripheral edge of the door opening 102, and is mainly inside the vehicle. Surface is pressed against the door opening 102. By attaching the double-sided tape 30 to the mounting portion 16, the door outer weather strip 1 is fixed to the front door 101, specifically, the peripheral edge portion of the door sash 101a shown in FIG. 1 (b).

In this specification, the case where the above-mentioned extrusion molding part 1a is manufactured by the manufacturing method according to one aspect of the present invention will be described as an example.

Each part constituting the door outer weather strip 1 is mainly formed of vulcanized rubber, a thermoplastic elastomer, a thermoplastic resin, or the like. Examples of the material of the vulcanized rubber include EPDM (ethylene-propylene-diene copolymer), IR (isoprene rubber), CR (chloroprene rubber), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR) and the like. Can be used. As the material of the thermoplastic elastomer, for example, olefin-based (TPO) or styrene-based (TPS) can be used. As the material of the thermoplastic resin, for example, polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), soft polyvinyl chloride, or the like can be used. The material may be solid, foamed sponge, or partially foamed sponge and others solid.

<Manufacturing method of extrusion molding part>
Next, a method of manufacturing the extrusion molding portion 1a (seal member) will be described with reference to FIGS. 2A and 2B, FIGS. 3, 4, and 5. FIG. 2A is a schematic view of a line for manufacturing the extrusion molding portion 1a using rubber as a material. When the molding material is a thermoplastic elastomer or a thermoplastic resin, it is manufactured on the production line shown in FIG. 2 (b). 3 (a) to 3 (c) are views of the drilling jig 90 viewed from each direction. FIGS. 4A to 4D are explanatory views of the installation state or the drilling state of the drilling jig 90 in the above manufacturing method. 5 (a) and 5 (b) are views for explaining in detail one process of drilling in the above manufacturing method.

(Outline of manufacturing method)
When the extrusion molding section 1a is manufactured using rubber as a molding material, as shown in FIG. 2A, the extrusion molding section 1a is a production line composed of an extruder 810, a vulcanizer 820, and a rotary roller 830. Manufactured by the manufacturing equipment). Specifically, the extrusion molding unit 1a is manufactured by following the steps (1) to (3) below.
(1) First, each auxiliary material is kneaded with a rubber material such as EPDM, and the prepared rubber compound is extruded into a predetermined shape (see (b) of FIG. 1) using an extruder 810 to cause plastic deformation. A possible unvulcanized rubber-like extrusion molding unit 1a (extruded product) is extruded toward the vulcanization furnace 820. A drilling jig 90 is attached to the base 811 of the extruder 810 at the point where the extrusion molding unit 1a exits the base 811, and the unvulcanized rubber-like extrusion molding part 1a capable of plastic deformation is the extruder 810. A hole 20 is formed in the drilling portion 15a of the hollow portion 15 of the extrusion molding portion 1a by the needle-shaped portion 91 (see FIGS. 3 and 4) of the drilling jig 90 at the position where the mouthpiece 811 is exited (details will be described later). ).

In addition, in FIGS. 2 and 3, the drilling jig 90 is directly attached to the base 811. However, if the extrusion molding portion 1a is the place where the base 811 is exited and the molding material is in a region where plastic deformation is possible, the base is formed. The 811 and the drilling jig 90 may be separated from each other.
(2) Next, the unvulcanized rubber-like extrusion-molded portion 1a in which the hole 20 is formed in the perforated portion 15a of the hollow portion 15 passes through the vulcanization furnace 820. In the vulcanization furnace 820, vulcanization is performed by high frequency such as microwaves or hot air, and elastic deformation is possible.

When the vulcanization process is composed of a plurality of vulcanizers 820, for example, the temperature setting conditions for each may be changed, or the hot air vulcanizer and the high frequency vulcanizer may be combined. When the rubber is foam rubber, foaming is performed at the same time as vulcanization in this vulcanization step.
(3) Next, the extrusion molding portion 1a that has passed through the vulcanization furnace 820 is sandwiched between the rotating rotary rollers 830 and taken over. After that, the extrusion molding portion 1a is completed through a step of attaching a double-sided tape (not shown).

When the molding material is a thermoplastic elastomer or a thermoplastic resin, it is manufactured on the production line shown in FIG. 2 (b). If the material is foamable, it will be foamed in the extruder 810. By passing the extruded part 1a extruded in a state where it can be plastically deformed through the cooler 850, it becomes a state where it can be elastically deformed. At this time, by passing Sizar 840, which is a jig having a hole in the cross-sectional shape of the product, it is possible to change the state so that it can be elastically deformed while maintaining the cross-sectional shape of the product. Since the drilling jig 90 and the rotary roller 830 are the same as those in FIG. 2A, the description thereof will be omitted.

(Punching jig)
As shown in FIG. 3A, in the base 811 of the extruder 810, the needle-shaped portion 91, the holding portion 92, and the rotation are located in the vicinity of the extrusion port 811a of the extrusion molding portion 1a (unvulcanized rubber-like). A drilling jig 90 having a shaft portion 93 is attached. The entire drilling jig 90 is installed via the holding portion 92, and the rotating shaft portion 93 and the needle-shaped portion 91 are large and thick enough to be inserted into the space S.

As shown in FIG. 3B, the rotation shaft portion 93 is a substantially rod-shaped portion held on the holding portion 92. The rotation shaft portion 93 rotates while being held on the holding portion 92 with the longitudinal direction thereof as the central axis of rotation. In this rotational movement, the angular velocity, rotation angle, rotation direction, direction switching, switching interval, and the like are appropriately controlled by a drive unit such as a motor (not shown) and a control device.

The needle-shaped portion 91 is a substantially needle-shaped portion, and one end thereof is fixed so as to be substantially perpendicular to the extending direction of the central axis of the rotating shaft portion 93. The other end of the needle-shaped portion 91 is sharp, and as shown in FIG. 3 (c), the pointed side (the other end side) of the needle-shaped portion 91 is rotated by the rotation of the rotation shaft portion 93. A rotational movement is performed so as to move on the circumference with the central axis of the shaft portion 93 as the center of the circle.

In addition, in FIGS. 3A to 3C, the shape of the needle-shaped portion 91 is conical as a whole, but it can be arbitrarily changed. For example, only the tip of the needle-shaped portion 91 may be sharp, and the other portions (other than the root) may have a cylindrical shape. Further, for example, the needle-shaped portion 91 may have a double-edged blade shape along the longitudinal direction, and the cutting edge may face the rotation direction.

(Punching method)
As described above, in the step (1), a hole 20 is formed in the perforated portion 15a of the hollow portion 15 in the unvulcanized rubber-like extrusion molded portion 1a by the needle-shaped portion 91. Specifically, the hole 20 is formed in the perforated portion by following the steps (i) to (iii) below.
(I) As shown in FIGS. 3 and 4, especially FIG. 4 (b), when the extrusion molding unit 1a is extruded from the extrusion port 811a of the extruder 810 and transported to the installation location of the drilling jig 90, drilling is performed. A part of the rotating shaft portion 93 in a state where the plane formed by the rotating shaft portion 93 and the needle-shaped portion 91 of the jig 90 is substantially parallel to the drilling surface (surface) of the drilling portion 15a of the hollow portion 15. The entire needle-shaped portion 91 is inserted into the space S through the opening of the space S formed by the drilling portion 15a of the hollow portion 15 and the mounting portion 16 via the holding portion 92, and the drilling standby state is established. (Punching standby process).

At this time, the longitudinal direction of the needle-shaped portion 91 is preferably substantially parallel to the extrusion direction of the molding material, and more preferably parallel. For example, the longitudinal direction of the needle-shaped portion 91 can be set to 45 ° with respect to the extrusion direction. However, when the rotation shaft portion 93 of the drilling jig 90 rotates and the sharp side (the other end side) of the needle-shaped portion 91 enters the hollow portion 15, the needle-shaped portion 91 and the hollow portion 15 Comparing the areas of contact with the perforation portion 15a and perforation between the two, the area substantially parallel to the extrusion direction is smaller, so that the resistance of the needle-shaped portion 91 to the product conveyed in the continuous extrusion step is small. Is lower and drilling is easier. This effect is further enhanced by making the longitudinal direction of the needle-shaped portion 91 parallel to the extrusion direction of the molding material.

Further, the pointed side (the other end side) of the needle-shaped portion 91 may face the extrusion direction or the direction opposite to the extrusion direction, but the one facing the extrusion direction is more suitable. desirable. As shown in FIG. 5B, when the pointed side (the other end side) of the needle-shaped portion 91 faces in the opposite direction, the tip of the pointed side (the other end side) of the needle-shaped portion 91 is directed. When the perforated portion 15a of the hollow portion 15 penetrates halfway through the wall thickness, the molding material flowing above the tip and the molding material flowing below the hollow portion 15 try to be separated into two hands. As a result, the resistance of the needle-shaped portion 91 to the product conveyed in the continuous extrusion process may increase.

In that respect, as shown in FIG. 5A, if the pointed side (the other end side) of the needle-shaped portion 91 faces the traveling direction, the possibility that the above phenomenon occurs is low. In the following description of the first embodiment, the needle-shaped portion 91 is installed in a state where the longitudinal direction is substantially parallel to the extrusion direction and the sharp side (the other end side) faces the extrusion direction. It is assumed that you are.

In the above-mentioned drilling standby step, when the entire needle-shaped portion 91 is inserted into the space S, the flat surface formed by the rotating shaft portion 93 and the needle-shaped portion 91 is relative to the drilling surface (surface) of the drilling portion 15a. It is not always necessary to make them substantially parallel. At a minimum, the plane formed by the rotating shaft portion 93 and the needle-shaped portion 91 may be in a state of facing the drilling surface (surface) of the drilling portion 15a.
(Ii) Next, the extrusion of the extrusion molding portion 1a is further advanced, and immediately before the planned hole formation portion in the drilling portion 15a of the hollow portion 15 passes directly above the needle-shaped portion 91 in the drilling standby state, it is driven by the control device. The rotation of the needle-shaped portion 91 is started by the control of the portion. Specifically, the rotation of the needle-shaped portion 91 is started immediately before the tip of the molding material on the extrusion direction side at the planned hole formation portion passes directly above the tip of the needle-shaped portion 91.

As shown in FIG. 4C, the needle-shaped portion 91 at this time rotates in the direction opposite to the extrusion direction (see the solid line arrow in the figure), and the needle-shaped portion 91 becomes a hollow portion due to this rotation. It penetrates through the perforation portion 15a of 15 and a hole 20 is formed in the perforation portion 15a where a hole is to be formed (perforation step).

As shown in FIG. 4A, the shape of the hole 20 is an elongated substantially rectangular shape extending along the extrusion direction in a plan view. When the needle-shaped portion 91 rotates from the drilling standby state to approximately 90 °, the rotation of the needle-shaped portion 91 is temporarily stopped by the control of the drive unit by the control device.
(Iii) Next, after making a hole 20 in the perforated portion 15a of the hollow portion 15, as shown in FIG. 4 (c), the needle-shaped portion 91 is formed in the step (ii) under the control of the drive portion by the control device. Rotate in the direction opposite to the rotation direction in. Then, the pointed side (the other end side) of the needle-shaped portion 91 is substantially parallel to the drilling portion 15a of the hollow portion 15 in a state where the pointed side (the other end side) of the needle-shaped portion 91 protrudes from the inside of the hollow portion 15 to the outside of the hollow portion 15 and faces the extrusion direction again. It will be in a state and will be in a state of waiting for drilling again.

By continuously carrying out each of the steps (i) to (iii) at predetermined intervals, a desired number of holes 20 can be formed in the perforated portion 15a of the hollow portion 15.

It should be noted that each of the above steps (i) to (iii) is merely an example, and the hole 20 may be formed in the perforated portion 15a of the hollow portion 15 by another method. For example, the rotation angle at which the rotation of the needle-shaped portion 91 is temporarily stopped in the step (ii) may be larger or smaller than 90 ° as long as the needle-shaped portion 91 has penetrated into the hollow portion 15. .. Further, in steps (ii) and (iii), the needle-shaped portion 91 which started rotation from the drilling standby state rotates to 180 ° without temporarily stopping in a state where it has penetrated into the hollow portion 15, and has a needle-like shape. The pointed side (the other end side) of the portion 91 may come out from the inside of the hollow portion 15 to the outside of the hollow portion 15 and temporarily stop in a state of facing the direction opposite to the extrusion direction, and may be in the drilling standby state again. ..

However, in this case, in the next drilling step, drilling is started with the pointed side (the other end side) of the needle-shaped portion 91 facing in the direction opposite to the extrusion direction, and after drilling, the needle-shaped portion 91 faces the extrusion direction. In this state, it temporarily stops and then enters the drilling standby state again. That is, the invasion of the needle-shaped portion 91 into the perforated portion 15a of the hollow portion 15 alternately repeats the states shown in FIGS. 5A and 5B. Compared to the case where the needle-shaped portion 91 invades the drilled portion 15a of the hollow portion 15 each time in the state of FIG. 5A, the resistance of the needle-shaped portion 91 to the product conveyed in the continuous extrusion step is higher. It can be expensive.

[Second Embodiment]
The door outer weather strip 2 (door weather strip for automobiles) manufactured by the manufacturing method according to the second embodiment of the present invention will be described with reference to (c), 6 and 7 of FIG. FIG. 2C is an extrusion step according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view of the extrusion-molded portion 2a of the door outer weather strip 2. FIG. 7 is a diagram showing a state in which the needle-shaped portion 91 of the drilling jig 90 has penetrated into the drilling portion 25a of the hollow portion 25 in the continuous extrusion step in the drilling method according to the second embodiment of the present invention.

The molding material may be rubber, a thermoplastic elastomer, or a resin material, and as described in the first embodiment, the production lines of FIG. 2 (a) or () are suitable for each. b) Manufactured in.

In the present embodiment, the extrusion molding unit 2a is manufactured by a manufacturing line (manufacturing apparatus) composed of an extruder 810 and a rotary roller 860, as shown in FIG. 2 (c). Specifically, when the extrusion molding portion 2a exits the base 811, the plastically deformable extrusion molding portion 2a is conveyed on the rotary roller 860.

Here, as shown in FIG. 6, the rotary roller 860 and the perforated portion 25a of the hollow portion 25 are separated from each other. When a device for punching by linearly reciprocating a needle or a drill in the longitudinal direction is virtually installed in the drilling portion 25a of the hollow portion 25, the rotary roller 860 (drilling obstacle, manufacturing device) is within the minimum installable range. (Consists of a part of), which hinders perforation. Therefore, the above-mentioned virtual device cannot be actually installed in the drilling method according to one aspect of the present invention.

Therefore, as shown in FIG. 7, the rotating shaft portion 93 and the needle-shaped portion 91 of the drilling jig 90 are inserted into the space S1 between the rotating roller 860 and the drilling portion 25a of the hollow portion 25 through the opening to drill. In the standby state, drilling is performed by rotating the needle-shaped portion 91 as described in the first embodiment.

[Other examples of products to which the production method according to one aspect of the present invention can be applied]
An example of another automobile seal member of a product to which the manufacturing method according to one aspect of the present invention can be applied will be described with reference to FIG. In each case, the perforated portion of the hollow portion is covered with a part of the sealing member as a perforated obstacle.

FIG. 8A is a cross-sectional view showing an example of a door inner weather strip 3 that can be manufactured by the above manufacturing method. FIG. 8B is a cross-sectional view showing an example of a belt line inner weather strip 4 that can be manufactured by the above manufacturing method. 8 (c) and 8 (d) are cross-sectional views showing examples of glass runs 5 and 6 that can be manufactured by the above manufacturing method. FIG. 8 (e) is a cross-sectional view showing an example of a hidden type glass run 7 that can be manufactured by the above manufacturing method.

First, with respect to the core metal-less type door inner weather strip 3 (seal member, door weather strip for automobiles) as shown in FIG. 8A, the extrusion molding portion 3a can be manufactured by the above manufacturing method. The door inner weather strip 3 is attached to the peripheral edge of the door opening in the frame of the automobile and seals between the peripheral edge of the door opening and the peripheral edge of the door panel of the automobile door that opens and closes the door opening. ..

In the extruded portion 3a, a hollow seal portion 3a-4 is formed on the vehicle outer surface of the vehicle outer side wall 3a-3, and the vehicle inner holding lip portion 2a projecting from the vehicle outer surface of the vehicle inner side wall 3a-1. The structure is such that a flange (not shown) is sandwiched between -2 and the outer side wall 3a-3 of the vehicle.

Here, in order to make a hole 20 in the vehicle outer side wall 3a-3, a needle is placed in the space S2 surrounded by the vehicle inner side wall 3a-1 and the connecting portion 3a-5 connecting the vehicle outer side wall 3a-3 and both side walls. It is easy and reliable to insert the shaped portion 91 and rotate it so that the needle-shaped portion 91 penetrates the outer side wall 3a-3 of the vehicle.

Further, for example, the extrusion molding portion 4a of the belt line inner weather strip 4 (seal member, door weather strip for automobiles) as shown in FIG. 8B can be manufactured by the above manufacturing method. The belt line inner weather strip 4 is attached to the lower end of the opening where the door glass moves up and down in the inner panel of the automobile door. Specifically, it is fixed by sandwiching the tip flange 401 of the inner panel between the vehicle inner side wall 4a-1 and the vehicle outer side wall 4a-2 of the extrusion molding portion 4a.

A hollow seal portion 4a-3 is formed on the vehicle outer surface of the vehicle outer side wall 4a-2 of the extrusion molding portion 4a. Here, in order to make a hole 20 in the perforated portion of the hollow seal portion 4a-3, the needle-shaped portion 91 is inserted into the space S3 surrounded by the vehicle inner side wall 4a-1 and the vehicle outer side wall 4a-2, and the rotation is performed. It is easy and reliable to move the needle-shaped portion 91 to penetrate the perforated portion.

Further, for example, the glass run 5 (seal member) as shown in FIG. 8C can be manufactured by the above manufacturing method. The glass run 5 is attached to the door frame of an automobile door, guides the door glass to move up and down, and seals between the peripheral edge of the door glass and the door frame when the door glass rises and the window is closed. To do.

In the glass run 5, the vehicle inner side wall 53 projects from one end of the base portion 52, and the vehicle outer side wall 54 projects from the other end. Further, from the tip of the vehicle inner side wall 53, the vehicle inner design lip portion 55 extending toward the connecting portion between the vehicle inner side wall 53 and the base portion 52 and the surface of the base portion 52 facing the door glass are directed. A vehicle inner seal lip portion 56 to be extended is provided. A similar lip is provided on the outer side wall 54 of the vehicle. The glass run 5 is mounted inside the channel portion with the flange of the channel portion provided in the door frame sandwiched between the side walls and the design lip portion inside and outside the vehicle.

Note that FIG. 8C shows a cross-sectional shape in the extrusion process, and each of the vehicle inner side wall 53 and the vehicle outer side wall 54 is open in a V shape, but when installed in the channel portion, both sides are open. The walls are almost parallel.

Further, a first hollow seal 59a is formed on the surface of the vehicle inner side wall 53 facing the vehicle inner seal lip portion 56, and serves to push back when the vehicle inner seal lip portion 56 bends due to contact with the door glass. Fulfill. A similar second hollow seal 59b is formed on the outer side wall 54 of the vehicle.

Here, in order to make a hole 20 in the vehicle inner side wall 53, the needle-shaped portion 91 is inserted into the space S4 surrounded by the vehicle inner side wall 53 and the vehicle inner design lip portion 55, and the needle-shaped portion 91 is rotated to form the needle-shaped portion. It is easy and reliable to let the portion 91 penetrate the inner side wall 53 of the vehicle. The same applies to the case where the hole 20 is formed in the outer side wall 54 of the vehicle (the needle-shaped portion 91 is inserted into the space S5 and rotated).

Further, for example, the glass run 6 (seal member) as shown in FIG. 8D can be manufactured by the above manufacturing method. In the glass run 6, the vehicle inner side wall 62 projects from the vehicle inner end of the base portion 61, and the vehicle outer side wall 63 projects from the vehicle outer side end. From the tip of the vehicle inner side wall 62, the vehicle inner design lip portion 64 projects toward the base portion 61, and from the tip of the vehicle outer side wall 63, the vehicle outer design lip portion 65 projects toward the base portion 61.

The glass run 6 has a structure in which the first flange 601 is sandwiched between the vehicle inner side wall 62 and the vehicle inner design lip portion 64, and the first flange 602 is sandwiched between the vehicle outer side wall 63 and the vehicle outer design lip portion 65. Further, a first hollow seal portion 66 is formed on the surface of the vehicle inner side wall 62 facing the vehicle outer side wall 63, and a second hollow seal portion 67 is formed on the surface of the vehicle outer side wall 63 facing the vehicle inner side wall 62. Has been done.

Here, in order to make a hole 20 in the vehicle inner side wall 62, the needle-shaped portion 91 is inserted into the space S6 surrounded by the vehicle inner side wall 62 and the vehicle inner design lip portion 64, and the needle-shaped portion 91 is rotated to form the needle-shaped portion. It is easy and reliable to let the portion 91 penetrate the inner side wall 62 of the vehicle. Similarly, in order to make a hole 20 in the vehicle outer side wall 63, the needle-shaped portion 91 is inserted into the space S7 surrounded by the vehicle outer side wall 63 and the vehicle outer design lip portion 65, and the needle-shaped portion 91 is rotated to form the needle-shaped portion. It is easy and reliable to let the portion 91 penetrate the outer side wall 63 of the vehicle.

Further, for example, the extrusion-molded portion 7a of the hidden type glass run 7 as shown in FIG. 8 (e) can be manufactured by the above manufacturing method. The glass run 7 has a function of making the sash invisible from the outside by hiding the sash of the automobile with the glass run 7, and can form an automobile door having an excellent appearance.

In the glass run 7, the body side side wall 73 and the glass run side side wall 74 project toward the inside of the vehicle from the vehicle inner surface of the vehicle outer side wall 71. Further, the vehicle inner side wall 72 protrudes vertically downward from the tip of the glass run side side wall 74, and the hollow seal portion 75 is formed on the surface of the glass run side side wall 74 facing the door glass 710. It has a function of suppressing abnormal noise caused by pushing up the door glass 710 when the door glass is closed.

The glass run 7 is attached to the door frame 700 by the vehicle inner side wall 72 abutting on the door frame 700 and sandwiching the flange 701 at the tip of the door frame 700 between the body side side wall 73 and the glass run side side wall 74.

Here, in order to make a hole 20 in the glass run side side wall 74, the needle-shaped portion 91 is inserted into the space S8 surrounded by the vehicle outer side wall 71, the body side side wall 73, and the glass run side side wall 74, and is rotated. It is easy and reliable to allow the needle-shaped portion 91 to penetrate the side wall 74 on the glass run side.

[Additional notes]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1, 2: Door outer weather strip (seal member, door weather strip for automobiles)
3: Door inner weather strip (seal member, door weather strip for automobiles)
4: Belt line inner weather strip (seal member, automobile door weather strip)
5, 6, 7: Glass run (seal member) 15, 25: Hollow part 15a, 25a: Drilling part 16: Mounting part (perforation obstacle) 20: Hole 90: Drilling jig 91: Needle-shaped part 92: Holding part 93 : Rotating shaft 810: Extruder 811: Base 860: Rotating roller (perforation obstacle)
S, S1, S2, S3, S4, S5, S6, S7: Space

Claims (7)

This is a drilling method for drilling a sealing member having a hollow portion in the hollow portion when the sealing member is manufactured by a continuous extrusion method.
A drilling jig is installed on the path through which the extruded product is conveyed after the molding material of the sealing member exits the mouthpiece of the extruder.
At least within the installation range of the perforation jig on the path, the perforation device for perforation is linearly reciprocated in the longitudinal direction to perforate the outside of the hollow portion of the perforation portion of the hollow portion at a distance from the perforation portion. The perforation obstacle covers the minimum installable range when the device is virtually installed, and there is an opening in the space formed by the perforation site and the perforation obstacle.
The drilling jig includes a holding portion, a rotating shaft portion, and a needle-shaped portion.
The entire drilling jig is installed on the path via the holding portion.
The rotating shaft portion is held on the holding portion, and the rotating shaft portion can be rotated while being held on the holding portion with the longitudinal direction of the rotating shaft portion as the central axis of rotation. ,
One end of the needle-shaped portion is fixed to the needle-shaped portion so as to intersect the extending direction of the central axis, the other end of the needle-shaped portion is sharp, and the rotating shaft portion rotates. As a result, the other end side of the needle-shaped portion can move on the circumference with the central axis as the center of the circle.
With the plane formed by the rotating shaft portion and the needle-shaped portion facing the surface of the perforated portion, at least a part of the rotating shaft portion and the entire needle-shaped portion can be seen from the opening. A drilling method characterized in that the needle-shaped portion is inserted into the space and installed in a drilling standby state, and the other end side of the needle-shaped portion penetrates into the hollow portion and drills by rotating the rotating shaft portion. At least the perforated portion of the sealing member is formed of either a vulcanized rubber, a thermoplastic elastomer, or a thermoplastic resin.
The drilling method according to claim 1, wherein the drilling is performed in a state in which the molding material is plastically deformable after the molding material exits the mouthpiece. When at least a part of the rotating shaft portion and the entire needle-shaped portion are inserted into the space and installed, the longitudinal direction of the needle-shaped portion is parallel to the extrusion direction of the molding material. The drilling method according to claim 1 or 2. The rotating shaft portion rotates and the other end side of the needle-shaped portion penetrates into the hollow portion, and after the perforation, the rotating shaft portion further rotates and the other end side is the hollow portion. From the inside of the portion to the outside of the hollow portion, the plane formed by the rotating shaft portion and the needle-shaped portion faces the surface of the drilling portion, and the drilling standby state is set again. The drilling method according to any one of claims 1 to 3, wherein the drilling into the hollow portion is intermittently and continuously performed by repeating the above. The sealing member is an automobile door weather strip.
The drilling method according to any one of claims 1 to 4, wherein the drilling obstacle is an attachment portion to an automobile door, which constitutes a part of the sealing member. The drilling method according to any one of claims 1 to 4, wherein the drilling obstacle constitutes a part of a manufacturing apparatus for manufacturing the seal member by the continuous extrusion method. A drilling jig installed on a path through which an extruded product is conveyed after the molding material of the seal member exits the mouthpiece of an extruder when a seal member having a hollow portion is manufactured by a continuous extrusion method. ,
At least within the installation range of the perforation jig on the path, the perforation device for perforation is linearly reciprocated in the longitudinal direction to perforate the outside of the hollow portion of the perforation portion of the hollow portion at a distance from the perforation portion. The perforation obstacle covers the minimum installable range when the device is virtually installed, and there is an opening in the space formed by the perforation site and the perforation obstacle.
The drilling jig includes a holding portion, a rotating shaft portion, and a needle-shaped portion.
The entire drilling jig is installed on the path via the holding portion.
The rotating shaft portion is held on the holding portion, and the rotating shaft portion can be rotated while being held on the holding portion with the longitudinal direction of the rotating shaft portion as the central axis of rotation. ,
One end of the needle-shaped portion is fixed to the needle-shaped portion so as to intersect the extending direction of the central axis, the other end of the needle-shaped portion is sharp, and the rotating shaft portion rotates. As a result, the other end side of the needle-shaped portion can move on the circumference with the central axis as the center of the circle.
With the plane formed by the rotating shaft portion and the needle-shaped portion facing the surface of the perforated portion, at least a part of the rotating shaft portion and the entire needle-shaped portion can be seen from the opening. A drilling jig characterized in that the needle-shaped portion is inserted into the space and installed in a state of waiting for drilling, and the other end side of the needle-shaped portion penetrates into the hollow portion and drills by rotating the rotating shaft portion.

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