Manufacturing method of annular weather strip, method of connecting weather strip and mold

Abstract

To provide a manufacturing method of an annular weather strip that can firmly fix an end part of the weather strip without worsening workability, a connection method of the weather strip, and a mold.SOLUTION: A mold which includes a body part where a cavity is formed, and a slide core 40 which extends to a second wall part 4b inside a cross-section U-shaped fitting part 4 and is removable to an opening side when a weather strip is inserted in the cavity is prepared. A manufacturing method of an annular weather strip includes: a step for removing a core material from both end parts of the weather strip; a step for inserting both end parts in the mold; and a step for softening a sheet material put in between both end parts and flowing it into a cavity part 9. At one end in a longitudinal direction of the slide core 40, a lower projection 44 projecting downward is formed opposite an opening side of a fallen rip 5. A curvature radius R2 of a recess R of a root part 44a of the lower projection 44 is set larger than the curvature radius R1 of the projection R of an end 5a of the rip 5.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing an annular weatherstrip in which both ends of a weatherstrip formed in a straight line are connected to form an annular shape, a method for connecting the ends of a weatherstrip, and a mold used therefor. [Background technology]

[0002] Conventionally, there has been known annular weatherstrips (hereinafter also referred to as "annular weatherstrips") which have a U-shaped mounting portion with a lip (sealing lip) on the inside, and which are attached to the vehicle body by clamping a vehicle body panel that defines a door opening of a vehicle, such as a front door or a back door, with the mounting portion, thereby sealing the door opening all around.

[0003] However, since weatherstrips are generally formed into a straight shape by extrusion molding, when manufacturing an annular weatherstrip, a sheet material is often sandwiched between both ends of the weatherstrip that has been formed into a straight shape, and these both ends are then connected via the sheet material.

[0004] For example, Patent Document 1 discloses a method for connecting a weatherstrip in which, when connecting both ends of an extruded weatherstrip with a sheet piece made of unvulcanized rubber or the like, a three-part connecting mold is used to hold each end of the weatherstrip, the three molds being made up of a lower mold and an upper mold that form the outer shape of the weatherstrip, and a nested intermediate mold that forms the inside of the mounting base (corresponding to the mounting part). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-301042 A (paragraph

[0006] ,

[0007] ) Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, although not described in the above Patent Document 1, some weatherstrips have a core material embedded in the mounting portion to increase the rigidity of the mounting portion. Even if an attempt is made to connect both ends of a weatherstrip with an embedded core material in this way via a sheet material, the core materials are not connected to each other, so the joints of the core material become weak points, and there is a risk that the connection will break when the annular weatherstrip is folded.

[0007] One possible solution is to remove the core material from the attachment parts at both ends of the weatherstrip by a predetermined length in the longitudinal direction of the weatherstrip, and then connect both ends via a sheet material. However, if pressure is applied to the attachment parts, the rigidity of which has been reduced by removing the core material, in order to firmly clamp the sheet material at both ends, the attachment parts will escape (deform), making it difficult to achieve a good connection, and ultimately resulting in a problem that the connection will break when the annular weatherstrip is folded.

[0008] Here, it is possible to consider using a nested mold that takes the shape of the inside of the mounting part, as in the above-mentioned Patent Document 1, to prevent the mounting part from escaping. However, when such a nested mold is removed, it becomes a so-called "forced removal," making the "forced removal" parts (lips, etc.) more susceptible to damage. In addition, the increased rigidity of the mounting part due to the core material (making it less likely to deform) combined with the "forced removal" results in a problem of worsening workability.

[0009] This problem is not limited to the case of manufacturing an annular weatherstrip, but can generally occur when connecting ends of weatherstrips in which a core material is embedded in a mounting portion.

[0010] The present invention has been made in consideration of these points, and its object is to provide a manufacturing method capable of producing an annular weatherstrip in which both ends of a straight weatherstrip are firmly bonded without compromising workability, a connection method capable of firmly connecting the ends of a weatherstrip together, and a mold that makes this possible. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, in the manufacturing method, connection method, and mold of the present invention, when connecting the ends of weatherstrips, the shape of the slide core located within the mounting portion having a U-shaped cross section at the end is devised to reduce the gap within the mounting portion and to make it easier to remove the slide core from the mounting portion.

[0012] Specifically, the present invention is directed to a method for manufacturing an annular weatherstrip in which both ends of a weatherstrip formed in a linear shape are connected to form an annular weatherstrip.

[0013] In this manufacturing method for an annular weatherstrip, the weatherstrip to be formed is one that is attached to the edge of a vehicle door opening and has an attachment portion with a U-shaped cross section, in which a core material is embedded and which has a lip on the inside.

[0014] In addition, in the manufacturing method of this annular weatherstrip, a pair of molds are prepared which include a main body portion having a cavity formed therethrough that is partitioned along the outer periphery of the cross section of the weatherstrip, and a slide core which extends the entire length of the cavity and which, when the weatherstrip is inserted into the cavity, extends inside the mounting portion in the anti-opening side until it contacts the mounting portion and can be removed to the open side of the mounting portion.

[0015] The manufacturing method of this annular weatherstrip includes the steps of: removing a predetermined length of the core material from the mounting portions at both ends of the weatherstrip in the longitudinal direction of the weatherstrip; inserting both ends of the weatherstrip into the pair of dies so that one end of the dies and an end of the weatherstrip coincide with each other; connecting the both ends via a sheet material sandwiched between the both ends of the weatherstrip inserted into the pair of dies, and pouring a softened sheet material into the hollow portions at both ends from which the core material was removed. One end of the slide core is formed with a protrusion that protrudes in a direction perpendicular to the removal direction and contacts the mounting portion, further anti-opening than the lip that falls anti-opening so as to contact the mounting portion by interfering with the slide core, in an end view of the weatherstrip inserted into the die, and the radius of curvature of the concave R of the base of the protrusion is set larger than the radius of curvature of the convex R of the tip of the lip.

[0016] With this configuration, both ends of the weatherstrip with the core material removed from the mounting portion are inserted into a pair of molds, and not only are the ends connected via the sheet material sandwiched between these two ends, but the softened sheet material is poured into the hollow portion from which the core material was removed, thereby improving the adhesive strength between the ends.

[0017] Here, in order to reliably pour the softened sheet material into the hollow space, it is necessary to apply pressure to firmly clamp the sheet material at both ends while firmly maintaining the cross-sectional shape of both ends. However, if pressure is applied to the mounting part, whose rigidity has decreased due to the core material being removed, the mounting part may escape, making it difficult to pour the softened sheet material into the hollow space.

[0018] In this respect, in the present invention, the weather strip is inserted into a cavity partitioned along the outer periphery of the cross section of the weather strip, so that the mounting portion from which the core material has been removed can be prevented from escaping (deforming) to the outside. In addition, at both ends of the weather strip and the ends of the corresponding mold, the slide core extends to the opposite opening side until it hits the mounting portion inside the mounting portion, and the lip falls to the opposite opening side so as to contact the mounting portion due to interference with the slide core, and the protrusion contacts the mounting portion further to the opposite opening side than the fallen lip, so that most of the space inside the mounting portion having a U-shaped cross section is filled with the slide core, the fallen lip, and the protrusion. This makes it possible to prevent the mounting portion, whose rigidity has been reduced by the removal of the core material, from escaping (deforming) to the inside. Therefore, even when pressure is applied to firmly sandwich the sheet material, the cross-sectional shape of both ends can be firmly maintained, and the softened sheet material can be reliably poured into the cavity, thereby reliably improving the adhesive strength between the ends.

[0019] However, if the space inside the mounting part having a U-shaped cross section is filled too densely, it becomes difficult to remove the slide core to the open side. In the present invention, however, the radius of curvature of the concave R of the base of the protrusion that is provided on the further side away from the lip tilted away from the open side is set to be larger than the radius of curvature of the convex R of the tip of the tilted lip. As a result, it becomes possible to remove the slide core from the mounting part more smoothly compared to, for example, a case where the radius of curvature of the convex R and the radius of curvature of the concave R are the same (the tip of the lip fits into the base of the protrusion) or a case where the radius of curvature of the convex R is larger than the radius of curvature of the concave R (the tip of the lip and the base of the protrusion are abutted).

[0020] As described above, according to the present invention, it is possible to manufacture an annular weatherstrip in which both end portions of a linearly formed weatherstrip are firmly bonded without compromising workability.

[0021] The present invention also relates to a method for connecting weatherstrips, which connects the ends of weatherstrips each having a mounting portion with a U-shaped cross section, with a core material embedded therein and a lip on the inside.

[0022] In this weatherstrip connecting method, a pair of molds are prepared which include a main body portion having a cavity formed therethrough which is partitioned along the outer periphery of the cross section of each weatherstrip, and a slide core which extends the entire length of the cavity and which, when each weatherstrip is inserted into the cavity, extends inside the mounting portion in the anti-opening side until it hits the mounting portion and can be removed to the open side of the mounting portion.

[0023] and connecting the ends of the weatherstrips inserted into the pair of dies via a sheet material sandwiched between the ends of the weatherstrips and pouring a softened sheet material into the hollow portions at the ends from which the core material was removed. The method of connecting weatherstrips includes the steps of: removing a predetermined length of the core material in the longitudinal direction of each weatherstrip from the attachment portion at the end of each weatherstrip; inserting the end of each weatherstrip into the die so that one end of the die and the end of each weatherstrip coincide with each other; connecting the ends of the weatherstrips inserted into the pair of dies via a sheet material sandwiched between the ends of the weatherstrips, and pouring a softened sheet material into the hollow portions at the ends from which the core material was removed. The method is characterized in that one end of the slide core has a protrusion that protrudes in a direction perpendicular to the removal direction and contacts the attachment portion, further anti-opening than the lip that falls anti-opening so as to contact the attachment portion by interfering with the slide core, in an end view of each weatherstrip inserted into the die, and the radius of curvature of the concave R of the base of the protrusion is set larger than the radius of curvature of the convex R of the tip of the lip.

[0024] According to this configuration, similarly to the above, even when pressure is applied to firmly pinch the sheet material, the cross-sectional shape of the ends can be firmly maintained and the slide core can be smoothly removed from the mounting portion. Therefore, a weatherstrip connection structure in which the ends of the weatherstrip are firmly bonded to each other can be realized without deteriorating workability.

[0025] Furthermore, the present invention also relates to a mold that maintains the cross-sectional shape of a weatherstrip having a U-shaped mounting portion with an embedded core material and an inner lip when connecting the ends of the weatherstrip via a sheet material, after the core material has been removed by a predetermined length in the longitudinal direction of the weatherstrip.

[0026] The mold comprises a main body portion having a cavity defined along the outer periphery of the cross section of the weatherstrip formed therethrough, and a slide core extending over the entire length of the cavity and extending in the anti-opening side until it comes into contact with the mounting portion inside the mounting portion when the weatherstrip is inserted into the cavity and being removable to the open side of the mounting portion, wherein one end of the slide core is formed with a protrusion that protrudes in a direction perpendicular to the removal direction and contacts the mounting portion, further anti-opening side than the lip that falls toward the anti-opening side so as to come into contact with the mounting portion by interfering with the slide core, in an end view of the weatherstrip when the weatherstrip is inserted into the cavity so that one end of the slide core coincides with an end of the weatherstrip, and the radius of curvature of the concave R of the base of the protrusion is set larger than the radius of curvature of the convex R of the tip of the lip.

[0027] According to this configuration, similarly to the above, even when pressure is applied to firmly clamp the sheet material, the cross-sectional shapes of both ends can be firmly maintained and the slide core can be smoothly removed from the mounting portion. Therefore, it is possible to manufacture an annular weatherstrip in which both ends of a linear weatherstrip are firmly bonded without deteriorating workability, and it is possible to realize a die that can firmly connect the ends of the weatherstrip to each other.

[0028] In the mold, the tip portion of the protrusion, which contacts the mounting portion when the weather strip is inserted into the cavity, may be R-shaped when viewed in the extension direction of the slide core.

[0029] According to this configuration, the tip of the protrusion that comes into contact with the mounting part is rounded, so that the protrusion prevents the mounting part from escaping inward after the core material has been removed, while an appropriate gap can be formed between the tip of the lip that has fallen to the opposite opening side and the tip of the protrusion that is provided further away from the lip. This, combined with the fact that the radius of curvature of the concave R at the base of the protrusion is set to be larger than the radius of curvature of the convex R at the tip of the fallen lip and the formation of an appropriate gap between the tip of the fallen lip and the tip of the protrusion, reliably prevents the protrusion from getting caught on the lip, and allows the slide core to be more smoothly removed from the mounting part.

[0030] Furthermore, in the above mold, the protrusion is formed in a range corresponding to a predetermined length for removing the core material from one end of the slide core, and the slide core may be formed so that the cross-sectional area thereof becomes smaller toward the other side as viewed in the extension direction of the slide core.

[0031] According to this configuration, the protrusion is formed in a range corresponding to a predetermined length from one end of the slide core, in other words, in a range where it is necessary to prevent the mounting part from escaping inward after the core material has been removed, so that the part where the space inside the mounting part with a U-shaped cross section is filled, i.e., the part where the resistance to removing the slide core is high, can be minimized. Also, since the slide core is formed so that the cross-sectional area becomes smaller as it goes to the other side when viewed in the direction in which the slide core extends, it is possible to minimize the resistance to removing the slide core other than the part where the space inside the mounting part needs to be filled. This combination allows the slide core to be removed from the mounting part more smoothly. Effect of the Invention

[0032] As described above, the manufacturing method of annular weatherstrip, the connecting method of weatherstrip, and the mold of the present invention make it possible to manufacture annular weatherstrips in which both ends of a straight weatherstrip are firmly bonded without compromising ease of installation, and to realize a connection structure in which the ends of the weatherstrips are firmly connected to each other. [Brief description of the drawings]

[0033] [Figure 1] 1 is a perspective view for explaining a manufacturing method of an annular weather strip according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view illustrating a weather strip. [Diagram 3] 1A is a schematic diagram of an annular weather strip, where FIG. 1A is an oblique view showing the case where it is applied to a door opening of a front door corresponding to the front seats, FIG. 1B is an oblique view showing the case where it is applied to a door opening of a back door, and FIG. 1C is a front view showing the case where it is applied to a door opening of a front door. [Figure 4] FIG. 2 is a perspective view showing a mold. [Diagram 5] FIG. 2 is a cross-sectional view showing a schematic diagram of a mold in a clamped state. [Figure 6]5A and 5B are diagrams showing a slide core in a schematic manner, in which FIG. 5A is a cross-sectional view taken along line VIa-VIa in FIG. 4, and FIG. 5B is a cross-sectional view taken along line VIb-VIb in FIG. [Figure 7] FIG. 7 is a view corresponding to FIG. 6(a) when the weather strip is inserted into the cavity of the mold. [Figure 8] FIG. 4 is a flow diagram showing a manufacturing process of the annular weather strip. [Figure 9] FIG. 4 is a diagram showing a weather strip during the manufacturing process. [Figure 10] FIG. 2 is a perspective view showing a state in which a weather strip is inserted into a cavity of a mold. [Figure 11] FIG. 4 is a perspective view showing a typical connection portion of an annular weather strip. [Figure 12] 11 is a cross-sectional view for explaining a schematic relationship between a lip and a lower protrusion. FIG. [Figure 13] 7 is a view corresponding to FIG. 6(a) when a weather strip is inserted into a cavity of a mold according to Modification 1. FIG. [Figure 14] 7 is a view corresponding to FIG. 6(a) when a weather strip is inserted into a cavity of a mold according to Modification 2. FIG. [Figure 15] 10 is a cross-sectional view for explaining a schematic internal state of a mounting portion of a weather strip when a slide core is used that prioritizes demoldability. FIG. [Figure 16] 1A and 1B are diagrams for explaining a typical problem that occurs in a connection molding process when a slide core that prioritizes demoldability is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0035] -Outline of manufacturing method- Fig. 1 is a perspective view for explaining a schematic method for manufacturing an annular weatherstrip 10 (see Fig. 3(c)) according to this embodiment. In this manufacturing method, as shown in Fig. 1, both end portions 1a, 1b of a weatherstrip 1 formed in a linear shape are held by a mold 20 (a first mold 20A and a second mold 20B) and these end portions 1a, 1b are connected via a rectangular sheet material 60 to form the weatherstrip 1 into an annular shape.

[0036] 1 is formed in a rectangular parallelepiped shape with the direction indicated by the arrows X1 and X2 as the longitudinal direction, the direction indicated by the arrows Y1 and Y2 perpendicular to the longitudinal direction as the width direction, and the direction indicated by the arrows Z1 and Z2 perpendicular to the longitudinal direction as the height direction. For this reason, in the following description, the direction indicated by the arrow X1 in each drawing is referred to as one longitudinal side, the direction indicated by the arrow X2 is referred to as the other longitudinal side, the direction indicated by the arrow Y1 is referred to as one width direction side, the direction indicated by the arrow Y2 is referred to as the other width direction side, the direction indicated by the arrow Z1 is referred to as the upper side, and the direction indicated by the arrow Z2 is referred to as the lower side, but this is merely for convenience and does not limit the mold opening / closing directions of the molds 20A and 20B.

[0037] -Weather strip- Fig. 2 is a cross-sectional view showing the weatherstrip 1. Fig. 3 is a schematic diagram showing the annular weatherstrip 10, in which Fig. 3(a) is a perspective view showing the case where the weatherstrip is applied to the door opening of the front door 51 corresponding to the front seats, Fig. 3(b) is a perspective view showing the case where the weatherstrip is applied to the door opening of the back door 53, and Fig. 3(c) is a front view showing the case where the weatherstrip is applied to the door opening of the front door 51. As shown in Fig. 2, the weatherstrip 1 to be molded in the manufacturing method of this embodiment has a first hollow portion 2 having a circular cross section, a second hollow portion 3 having a trapezoidal cross section, and an attachment portion 4, and is formed into a long linear shape by extrusion molding.

[0038] As shown in FIG. 2, the mounting portion 4 includes a first wall portion 4a provided on the first and second hollow portions 2 and 3, a third wall portion 4c provided so as to face the first wall portion 4a, and a second wall portion 4b connecting the first wall portion 4a and the third wall portion 4c, and is formed in a U-shaped cross section having a mounting space 4d. A metal core material 8 is embedded in the mounting portion 4 to increase its rigidity. The mounting portion 4 also has three lips 5, 6, and 7 on its inside. More specifically, the third wall portion 4c is formed with a lip 5 extending toward the first wall portion 4a, while the first wall portion 4a is formed with two lips 6 and 7 smaller than the lip 5 extending toward the third wall portion 4c.

[0039] As shown in Figures 3(a) and 3(b), the weatherstrip 1 is attached to body panels 50a, 50b that define the door opening of a vehicle 50, and is formed in an annular shape to seal the entire periphery of the door opening. More specifically, the weatherstrip 1 formed in a long, linear shape by extrusion molding is cut (cut) to a predetermined length, and then, as shown in Figure 3(c), a first end 1a and a second end 1b are connected via a connecting portion 11 to form an annular weatherstrip 10.

[0040] When the vehicle body panels 50a, 50b are inserted into the mounting space 4d from the open side (opposite the second wall portion 4b) of the mounting portion 4 to mount the annular weather strip 10 to the vehicle body panels (door opening edges) 50a, 50b, the vehicle body panels 50a, 50b are firmly sandwiched by the mounting portion 4, the rigidity of which is increased by the core material 8, and the lips 5, 6, 7 come into contact with the vehicle body panels 50a, 50b, thereby sealing the door opening. In addition, when the front door 51 or the back door 53 is closed, the first and second hollow portions 2, 3 are compressed between the front door 51 or the back door 53 and the vehicle body panels 50a, 50b, thereby reducing the reaction force acting on the front door 51 or the back door 53.

[0041] -Overall configuration of the mold- 4 is a perspective view showing a schematic diagram of a mold 20. This mold 20 is not used for extrusion molding, injection molding, or the like, but is used to maintain the cross-sectional shape of both ends 1a, 1b of a weatherstrip 1 formed in a straight line, the weatherstrip 1 including an attachment portion 4 having a U-shaped cross section with lips 5, 6, and 7 on the inside, in a predetermined shape when the both ends 1a, 1b are connected via a sheet material 60 to form an annular shape, the both ends 1a, 1b having the core material 8 removed by a predetermined length R (see FIG. 9(a)) in the longitudinal direction of the weatherstrip 1.

[0042] As shown in Fig. 1 and Fig. 4, the mold 20 includes a pair of molds 20A, 20B. Specifically, the mold 20 includes a first mold 20A that holds a first end 1a of the weatherstrip 1, and a second mold 20B that holds a second end 1b of the weatherstrip 1. Since the first mold 20A and the second mold 20B are formed symmetrically, the first mold 20A will be described below as a representative. Also, the first mold 20A will be simply referred to as the "mold 20A" below.

[0043] Fig. 5 is a cross-sectional view showing the mold 20A in a clamped state. As shown in Fig. 5, the mold 20A includes an upper mold 31 and a lower mold 32 that are relatively movable up and down, slide molds 33 and 34 that are relatively movable in the width direction, and a slide core 40 that is relatively movable in the width direction like the slide mold 34.

[0044] The upper mold 31 is in a clamped state by moving downward, for example, as shown by the white arrow in Fig. 5, and is in an open state by moving upward. The lower mold 32 is in a clamped state by moving upward, for example, as shown by the dotted arrow in Fig. 5, and is in an open state by moving downward. The sliding mold 33 is in a clamped state by moving relatively to the other side in the width direction, for example, as shown by the hatched arrow in Fig. 5, and is in an open state by moving relatively to one side in the width direction. Conversely, the sliding mold 34 is in a clamped state by moving relatively to one side in the width direction, for example, as shown by the filled arrow in Fig. 5, and is in an open state by moving relatively to the other side in the width direction.

[0045] The upper mold 31, the lower mold 32 and the slide molds 33, 34 are respectively formed with mold surfaces 31a, 32a, 33a, 34a which define a part of the cavity 30a in the mold 20A as shown in Fig. 5. When the upper mold 31, the lower mold 32 and the slide molds 33, 34 are combined (clamped), these mold surfaces 31a, 32a, 33a, 34a form the cavity 30a defined so as to follow the outer periphery of the cross section of the weatherstrip 1 as shown in Fig. 5.

[0046] The upper die 31, the lower die 32 and the slide dies 33, 34 on which such die surfaces 31a, 32a, 33a, 34a are formed are formed to have the same cross-sectional shape from one end 21 to the other end 22 in the longitudinal direction. Therefore, when the upper die 31, the lower die 32 and the slide dies 33, 34 clamped together, in other words, the clamped die 20A excluding the slide core 40, is referred to as the "main body 30," it can be said that the main body 30 has a cavity 30a formed therethrough that is defined along the outer periphery of the cross section of the weatherstrip 1.

[0047] -Slide core- In contrast, the slide core 40 is formed so that the cross-sectional shape changes from one end 21 to the other end 22 in the longitudinal direction. Fig. 6 is a schematic diagram of the slide core 40, in which Fig. 6(a) is a cross-sectional view taken along line VIa-VIa in Fig. 4, and Fig. 6(b) is a cross-sectional view taken along line VIb-VIb in Fig. 4. Fig. 7 is a diagram corresponding to Fig. 6(a) when the weather strip 1 is inserted into the cavity 30a of the mold 20A. In Fig. 7, the upper mold 31, the lower mold 32, and the slide molds 33 and 34 are omitted for ease of viewing.

[0048] The slide core 40 extends over the entire length of the cavity 30a in the longitudinal direction as shown in Fig. 4, and is in a mold-closed state when moved relatively to one side in the width direction as shown by the black arrow in Fig. 5, while being in a mold-open state when moved relatively to the other side in the width direction. More specifically, the slide core 40 is adapted to be relatively removed to the open side of the mounting portion 4 of the weatherstrip 1 by moving the weatherstrip 1 to one side in the width direction from the state shown in Fig. 7.

[0049] Moreover, the slide core 40 has a core body portion 41 that extends to one side in the width direction (opposite the open side) until it abuts against the inner side surface 4e of the second wall portion 4b in the mounting space 4d inside the mounting portion 4 when the weather strip 1 is inserted into the cavity 30a (see FIG. 7). The tip surface 41a of the core body portion 41 is formed so that, at one end in the longitudinal direction of the mold 20A, it abuts against the inner side surface 4e of the second wall portion 4b of the weather strip 1 as shown in FIG. 6(a), and gradually retreats to the other side in the width direction as it moves to the other side in the longitudinal direction, and moves away from the inner side surface 4e as shown in FIG. 6(b). In other words, the slide core 40 is formed so that the cross-sectional area becomes smaller as it moves to the other side as viewed in the longitudinal direction (the direction in which the slide core 40 extends).

[0050] In this way, by forming the slide core 40 (core body 41) so that the cross-sectional area becomes smaller as viewed in the longitudinal direction from one side to the other side in the longitudinal direction, it becomes easier to insert the weatherstrip 1 into the cavity 30a from the other side in the longitudinal direction to one side. Also, due to interference with the core body 41, whose cross-sectional area gradually increases as it approaches one side in the longitudinal direction, the lips 6, 7 fall toward one side in the width direction (opposite the opening side) so as to contact the first wall 4a, and the lip 5 falls toward one side in the width direction so as to contact the third wall 4c. Therefore, when the weatherstrip 1 is inserted into the cavity 30a so that the end 21 on one side of the mold 20A and the end of the weatherstrip 1 coincide with each other, the core body 41 fits neatly into the mounting space 4d as if it were pushed into the mounting space 4d of the mounting portion 4 of the weatherstrip 1 from the other side in the width direction (the opening side of the mounting portion 4), as shown in FIG.

[0051] 6(a) and 7, two upper protrusions 42, 43 protruding upward from an upper surface 41b and a lower protrusion 44 protruding downward from a lower surface 41c are formed on one end of the core body 41 in the longitudinal direction. The positions of the upper and lower protrusions 42, 43, 44 are determined based on the lips 5, 6, 7 of the weatherstrip 1.

[0052] More specifically, when the weatherstrip 1 is inserted into the cavity 30a so that the end 21 on one side of the mold 20A and the end of the weatherstrip 1 are aligned, the two upper protrusions 42, 43 are formed so that they protrude upward (in a direction perpendicular to the removal direction) further to one widthwise side (the side opposite the opening of the mounting portion 4) than the lips 6, 7 which each lean to one widthwise side so as to contact the first wall portion 4a of the mounting portion 4 by interfering with the core body portion 41, and thus contact the first wall portion 4a of the mounting portion 4, as viewed from the end of the weatherstrip 1.

[0053] In addition, when the weatherstrip 1 is inserted into the cavity 30a so that the end 21 on one side of the mold 20A and the end of the weatherstrip 1 are aligned, the lower protrusion portion 44 is formed so that it protrudes downward (in a direction perpendicular to the removal direction) on one side of the width direction further than the lip 5, which leans to one side in the width direction so as to contact the third wall portion 4c of the mounting portion 4 by interfering with the core main body portion 41, and contacts the third wall portion 4c of the mounting portion 4, when viewed from the end of the weatherstrip 1.

[0054] These upper and lower protrusions 42, 43, 44 are formed in a range corresponding to a predetermined length R for removing the core material 8 of the weather strip 1 from one end of the slide core 40 in the longitudinal direction. The upper and lower protrusions 42, 43, 44 are formed so that the protrusion length gradually decreases toward the other longitudinal direction, and becomes zero at a predetermined position.

[0055] -Manufacturing process for annular weather strips- Next, a manufacturing process for the annular weather strip 10 using the mold 20 constructed as above will be described.

[0056] Fig. 8 is a flow diagram showing the manufacturing process of the annular weatherstrip 10, and Fig. 9 is a diagram showing the weatherstrip 1 in the manufacturing process. As shown in Fig. 8, the manufacturing method according to this embodiment includes an extrusion molding process S1, a cutting process S2, a core material removal process S3, a die insertion process S4, a joint molding process S5, and a molded product demolding process S6. Fig. 9(a) corresponds to the core material removal process S3, Fig. 9(b) corresponds to the die insertion process S4, and Fig. 9(c) corresponds to the joint molding process S5. In Fig. 9, the lengths of the dies 20A and 20B in the longitudinal direction are exaggerated to make the drawing easier to see.

[0057] First, in the extrusion molding process S1, a core material 8 is prepared by bending a flat workpiece having rectangular metal pieces 8a arranged in parallel at a fixed interval and connected by connecting parts (not shown) into a U-shape in a plane perpendicular to the arrangement direction, and the core material 8 is continuously covered with a rubber material by composite extrusion molding (molded integrally with the rubber material) to produce a long weather strip 1.

[0058] Next, in the cutting process S2, the long weather strip 1 manufactured in the extrusion molding process S1 is cut to a length corresponding to the entire circumference of the door opening in the front door 51 of the vehicle 50 using a cutting blade such as a cutter (not shown).

[0059] Next, in the core material removal process S3, the core material 8 is removed from the attachment parts 4 at both ends 1a, 1b of the weatherstrip 1 cut in the cutting process S2 by a predetermined length R in the longitudinal direction of the weatherstrip 1. Specifically, as shown in the upper part of FIG. 9(a), among the metal pieces 8a constituting the core material 8, the metal pieces 8a' located at both ends of the weatherstrip 1 are removed using a tool such as pliers as shown by the white arrows in FIG. 9(a). As a result, as shown in the lower part of FIG. 9(a), a hollow portion 9 having a U-shaped cross section is formed at both ends 1a, 1b of the weatherstrip 1 by the predetermined length R from which the core material 8 has been removed.

[0060] Next, in the mold inserting step S4, a pair of molds 20A, 20B are prepared, and both ends 1a, 1b of the weatherstrip 1 are inserted into the pair of molds 20A, 20B so that one end of the molds 20A, 20B coincides with the end of the weatherstrip 1. More specifically, from the other side in the longitudinal direction, as shown in FIG. 10, the first end 1a of the weatherstrip 1 is inserted into the cavity 30a of the first mold 20A so that the end 21 on one side of the first mold 20A coincides with the end of the weatherstrip 1. Similarly, from one side in the longitudinal direction, the second end 1b of the weatherstrip 1 is inserted into the cavity 30a of the second mold 20B so that the end 21 on the other side of the second mold 20B coincides with the end of the weatherstrip 1.

[0061] Next, in the connection molding process S5, as shown in Figures 1 and 9(c), a rectangular sheet material 60 made of unvulcanized rubber and having a thickness of 1.4 mm, which is sandwiched between both ends 1a, 1b of the weatherstrip 1 inserted into a pair of molds 20A, 20B (see the black arrows in the upper part of Figure 9(c)), is heated to connect both ends 1a, 1b, as shown in the lower part of Figure 9(c), and the softened sheet material 60 is poured into the hollow portion 9 from which the core material 8 (metal piece 8a') in both ends 1a, 1b has been removed, to form a strong connection portion 11.

[0062] Finally, in the molded product demolding process S6, in the pair of molds 20A, 20B, the upper mold 31 is moved upward relative to the pair of molds 20A, 20B, the lower mold 32 is moved downward relative to the pair of molds 20A, 20B, the slide mold 33 is moved relatively to one side in the width direction, and the weatherstrip 1 is moved to one side in the width direction (the core body portion 41 is relatively removed from the mounting portion 4), thereby removing the molded product from the pair of molds 20A, 20B. This completes the manufacture of the annular weatherstrip 10 as shown in Fig. 11.

[0063] As described above, according to the manufacturing method of the annular weatherstrip 10 of this embodiment, not only are both ends 1a, 1b of the weatherstrip 1, from which the core material 8 (metal piece 8a') has been removed from the mounting portion 4, inserted into a pair of molds 20A, 20B, respectively, and both ends 1a, 1b are connected via the sheet material 60 sandwiched between these ends 1a, 1b, but the softened sheet material 60 is poured into the hollow portion 9 from which the core material 8 has been removed, thereby improving the adhesive strength between the ends 1a, 1b, and thereby making it possible to manufacture an annular weatherstrip 10 having a strong connection portion 11.

[0064] -Protrusions of the slide core- Here, in order to facilitate understanding of the present invention, problems that arise when using a slide core that prioritizes demoldability (removability) will be described. Fig. 15 is a cross-sectional view that typically explains the internal state of the mounting portion 4 of the weather strip 1 when using a slide core 140 that prioritizes demoldability, and Fig. 16 is a diagram that typically explains problems that arise in the connection portion molding step S5 when using a slide core 140 that prioritizes demoldability.

[0065] If ease of demolding (removal) is prioritized, then it is possible to provide the slide core 140 with a straight core body portion 141 whose upper surface is approximately flush with the lower ends of the inclined lips 6, 7 and whose lower surface is approximately flush with the upper end of the inclined lip 5, as shown in FIG. 15, so that the slide core 140 does not get caught on (interfere with) the inclined lips 6, 7 or the inclined lip 5 when being relatively removed to the other widthwise side (the open side of the mounting portion 4).

[0066] However, in such a core body 141, at both ends 1a, 1b of the weatherstrip 1, a gap 4f is generated between the third wall 4c of the mounting portion 4 and the core body 141 on one widthwise side of the fallen lip 5, and gaps 4g, 4h are generated between the first wall 4a of the mounting portion 4 and the core body 141 on one widthwise side of the fallen lips 6, 7. In other words, in the mounting space 4d inside the mounting portion 4 having a U-shaped cross section, a space is generated that is not filled by the slide core 140 and the fallen lips 5, 6, 7.

[0067] For this reason, taking gap 4f as an example, in order to firmly connect both ends 1a, 1b of weatherstrip 1, it is necessary to apply pressure to mounting portions 4 at both ends 1a, 1b during molding, as shown by the white arrows in Figure 16(a). However, if pressure is applied to mounting portion 4, whose rigidity has decreased due to the core material 8 being removed, mounting portion 4 (third wall portion 4c) will escape into the upward gap 4f, as shown by the solid black arrow in Figure 16(a), which may result in both ends 1a, 1b not being firmly connected or it may become difficult to pour softened sheet material 60 into hollow portion 9.

[0068] Furthermore, the presence of gap 4f makes it difficult to firmly hold mounting portions 4 (third wall portions 4c) at both ends 1a, 1b. Therefore, even if pressure is applied to mounting portions 4 at both ends 1a, 1b during molding, as shown by the open arrows in Figure 16(b), the mounting portions 4, whose rigidity has decreased due to the removal of core material 8, may be pushed back by the elastic force of sheet material 60, as shown by the filled arrows in Figure 16(b), and their position in the longitudinal direction may become unstable.

[0069] In this regard, in the first and second molds 20A, 20B of this embodiment, the weatherstrip 1 is inserted into a cavity 30a that is partitioned to follow the outer periphery of the cross section of the weatherstrip 1, so that outward deformation of the mounting portion 4, whose rigidity has been reduced by the removal of the core material 8 (metal piece 8a'), specifically, deformation of the second wall portion 4b to one widthwise side and deformation downward of the third wall portion 4c, can be suppressed.

[0070] In addition, at both ends 1a, 1b of the weatherstrip 1, and at the corresponding end on one longitudinal side of the first mold 20A and the end on the other longitudinal side of the second mold 20B, the core body 41 extends to one widthwise side until it hits the second wall 4b in the mounting space 4d of the mounting portion 4, and due to interference with the core body 41, the lips 5, 6, 7 are tilted to one widthwise side so as to contact the mounting portion 4, and the upper and lower protrusions 42, 43, 44 contact the mounting portion 4 further to one widthwise side than the tilted lips 5, 6, 7. As a result, most of the mounting space 4d of the mounting portion 4 having a U-shaped cross section is filled with the core body 41, the tilted lips 5, 6, 7 and the upper and lower protrusions 42, 43, 44. This makes it possible to suppress inward deformation of the mounting portion 4, the rigidity of which has been reduced by removing the core material 8, specifically, deformation downward of the first wall portion 4a, deformation toward the other widthwise side of the second wall portion 4b, and deformation upward of the third wall portion 4c.

[0071] Therefore, even when pressure is applied to the mounting portions 4 at both ends 1a, 1b so as to firmly sandwich the sheet material 60, the cross-sectional shape of both ends 1a, 1b can be firmly maintained, as shown in the upper part of Figure 9(c).This allows the softened sheet material 60 to be reliably poured into the hollow portion 9, as shown in the lower part of Figure 9(c), thereby reliably improving the adhesive strength between the ends 1a, 1b.

[0072] -Shape of protrusion- Fig. 12 is a cross-sectional view for typically explaining the relationship between the lip 5 and the lower protrusion 44. In Fig. 12, hatching of the slide core 40 other than the lower protrusion 44 is omitted in order to make the drawing easier to see.

[0073] As described above, in this embodiment, by providing the upper and lower protrusions 42, 43, 44 on the core body 41, when connecting both ends 1a, 1b of the weatherstrip 1, the gap in the mounting space 4d of the mounting part 4 at both ends 1a, 1b is reduced, and deformation of the mounting part 4, the rigidity of which is reduced by removing the core material 8, is suppressed. However, if the mounting space 4d of the mounting part 4 having a U-shaped cross section is filled too densely, it becomes difficult to remove the slide core 40 from the mounting part 4.

[0074] In this embodiment, the shapes of the upper and lower protrusions 42, 43, 44 are devised to facilitate removal of the slide core 40 from the mounting portion 4. Specifically, as shown in Fig. 12, the radius of curvature R2 of the concave R of the base portion 44a of the lower protrusion 44 is set to be larger than the radius of curvature R1 of the convex R of the tip portion 5a of the lip 5.

[0075] In this way, the radius of curvature R2 of the concave R of the base portion 44a of the lower protrusion 44 (corresponding to the fallen lip 5), which is provided on one side of the width direction of the mounting portion 4 (the side opposite to the opening) relative to the fallen lip 5, is set to be larger than the radius of curvature R1 of the convex R of the tip portion 5a of the fallen lip 5. Therefore, the slide core 40 can be removed from the mounting portion 4 more smoothly than when, for example, the radius of curvature R1 of the convex R and the radius of curvature R2 of the concave R are the same (the tip portion 5a is fitted into the base portion 44a) or the radius of curvature R1 of the convex R is larger than the radius of curvature R2 of the concave R (the tip portion 5a and the base portion 44a are abutted against each other).

[0076] Furthermore, in this embodiment, the tip portion 44b of the lower protrusion portion 44, which comes into contact with the third wall portion 4c when the weather strip 1 is inserted into the cavity 30a, is formed to have an R-shape having a radius of curvature R3 when viewed in the longitudinal direction (the direction in which the slide core 40 extends).

[0077] In this way, since the tip 44b of the lower projection 44 that contacts the third wall 4c has an R-shape, the lower projection 44 suppresses the inward deformation of the third wall 4c whose rigidity has been reduced by removing the core material 8, while forming an appropriate gap 4i between the tip 5a of the fallen lip 5 and the tip 44b of the lower projection 44 provided on one side in the width direction from the fallen lip 5, as shown in Fig. 12. As a result, the radius of curvature R2 of the concave R of the base 44a of the lower projection 44 is set to be larger than the radius of curvature R1 of the convex R of the tip 5a of the fallen lip 5, and an appropriate gap 4i is formed between the tip 5a of the fallen lip 5 and the tip 44b of the lower projection 44, which combine to allow the slide core 40 to be more smoothly removed from the attachment portion 4.

[0078] In order to avoid duplication, explanation will be omitted, but the relationship between the lip 6 and the upper protrusion 42 and the shape of the upper protrusion 42, as well as the relationship between the lip 7 and the upper protrusion 43 and the shape of the upper protrusion 43 are similar to the relationship between the lip 5 and the lower protrusion 44 and the shape of the lower protrusion 44.

[0079] In addition, in this embodiment, as described above, the upper and lower protrusions 42, 43, 44 are formed in a range corresponding to the predetermined length R from one end of the slide core 40 in the longitudinal direction, in other words, in a range where it is necessary to prevent the mounting part 4 from escaping inward after the core material 8 has been removed, so that the part where the mounting space 4d of the mounting part 4 having a U-shaped cross section is filled, i.e., the part where the removal resistance of the slide core 40 is large, can be minimized. Also, since the slide core 40 is formed so that the cross-sectional area becomes smaller as viewed in the longitudinal direction toward the other longitudinal direction, it is possible to minimize the removal resistance of the slide core 40 in parts other than the part where the mounting space 4d of the mounting part 4 needs to be filled. These factors combine to make it possible to remove the slide core 40 from the mounting part 4 more smoothly.

[0080] As described above, according to this embodiment, it is possible to manufacture an annular weatherstrip 10 in which both end portions 1a, 1b of the weatherstrip 1 formed in a linear shape are firmly bonded without compromising workability.

[0081] (Variation 1) This modification differs from the above embodiment in that only the lower protrusion is provided. The following description will focus on the differences from the embodiment.

[0082] Fig. 13 is a view corresponding to Fig. 6(a) when the weather strip 1 is inserted into the cavity 30a of the mold 20A' according to this modified example. In the above embodiment, the upper and lower protrusions 42, 43, 44 are provided, but the first wall 4a is continuous with the second hollow portion 3 and is therefore less likely to bend than the second wall 4b and the third wall 4c, and is therefore less likely to break than the second wall 4b and the third wall 4c.

[0083] Therefore, in the mold 20A' according to this modification, the upper protrusions 42, 43 on the first wall 4a side are omitted, and only the lower protrusion 44' is formed on the slide core 40', as shown in Fig. 13. In this way, even with the slide core 40' in which only the lower protrusion 44' is formed, the core body 41' can prevent the second wall 4b from escaping inward, and the lower protrusion 44' can prevent the third wall 4c from escaping upward, so that the softened sheet material 60 can be reliably poured into the cavity 9 in the second wall 4b and the third wall 4c, and the adhesive strength between the ends 1a, 1b can be reliably improved.

[0084] Moreover, by omitting the upper protrusions 42, 43, the structure of the slide core 40' can be simplified and the slide core 40' can be removed from the mounting portion 4 more smoothly.

[0085] (Variation 2) This modification differs from the above embodiment in that the present invention is applied to a weather strip having a decorative lip. The following description will focus on the differences from the embodiment.

[0086] Figure 14 is a diagram equivalent to Figure 6(a) when a weatherstrip 1' is inserted into the cavity 30a of a mold 20A" of this modified example. The weatherstrip 1' differs from the above-mentioned weatherstrip 1 in that it has a decorative lip 15 that extends and curves toward the other side in the width direction as it goes downward from the corner between the second wall portion 4b and the third wall portion 4c. On the other hand, mold 20A" differs from mold 20A in that the portion between the third wall portion 4c and the decorative lip 15 is an undercut, and therefore the lower mold 32 is divided into a sliding mold 35 that moves in the width direction, and a lower mold 32'.

[0087] By using the mold 20A" of this modified example, it is possible to manufacture an annular weatherstrip in which both ends of the weatherstrip 1' are firmly bonded, as in the above embodiment. In addition, since the second wall portion 4b and the third wall portion 4c are continuous with the decorative lip 15, they are less likely to bend. This combines to manufacture an annular weatherstrip that is even less likely to break.

[0088] (Other embodiments) The present invention is not limited to the embodiments, and can be embodied in various other forms without departing from the spirit or main characteristics thereof.

[0089] In the above embodiment, the present invention is applied to a weather strip 1 having first and second hollow portions 2, 3, but this is not limited to this and the present invention may be applied to a weather strip having, for example, one hollow portion.

[0090] In addition, in the above embodiment, the present invention is applied to a weatherstrip 1 having three lips 5, 6, 7 within the mounting space 4d, but this is not limited to this, and the present invention may be applied to a weatherstrip having, for example, two or less or four or more lips within the mounting space.

[0091] Furthermore, in the above embodiment, the present invention is applied to a weatherstrip 1 in which the mounting portion 4 having a U-shaped cross section opens in a direction approximately perpendicular to the direction in which the first and second hollow portions 2, 3 and the mounting portion 4 are aligned, but this is not limited to this, and the present invention may be applied to, for example, a weatherstrip in which the mounting portion having a U-shaped cross section opens on the side opposite the hollow portion (approximately the same direction as the direction in which the hollow portions and the mounting portion are aligned).

[0092] In addition, in the above embodiment, the present invention is applied to the annular weather strip 10 used in the door opening of the front door 51 corresponding to the front seats, but the present invention is not limited to this, and may be applied to, for example, the annular weather strip 10 used in the door opening of the rear door 52 corresponding to the rear seats.

[0093] Furthermore, in the above embodiment, the sheet material 60 made of unvulcanized rubber is used, but this is not limited to this. For example, a sheet material made of a thermoplastic elastomer or a sheet material made of a resin such as polyethylene may be used.

[0094] In addition, in the above embodiment, the annular weatherstrip 10 is manufactured by connecting both ends 1a, 1b of the weatherstrip 1 formed in a straight line, but this is not limited to the above, and the ends of different weatherstrips 1 may be connected to each other by using a first mold 20A and a second mold 20B and going through a process similar to that shown in the flow diagram in Figure 8.

[0095] As such, the above-described embodiment is merely illustrative in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0096] According to the present invention, not only can an annular weatherstrip be manufactured in which both ends of a linear weatherstrip are firmly bonded without compromising workability, but a connection structure can be realized in which the ends of different weatherstrips are firmly bonded to each other, making it extremely useful for application to a method for manufacturing an annular weatherstrip, a method for connecting weatherstrips, and the molds used therein. [Explanation of symbols]

[0097] 1, 1' Weather strip 1a 1st end 1b Second end 4 Mounting part 5, 6, 7 Lip 5a Tip 8 Core material 9 Cavity 10 Annular weather strip 20A, 20A', 20A" 1st mold 20B 2nd mold 30 Main body 30a cavity 21 One end 40, 40' Slide Core 42,43 Upper protrusion 44 Lower protrusion 44a Base 44b Tip 50 vehicles 50a, 50b Body panel (door opening edge) 60 Sheet material R Prescribed length R1,R2 radius of curvature S3 Core removal process S4 Mold insertion process S5 Connection molding process Y1 Width direction one side (opposite open side) Y2 Other side in width direction (open side)

Claims

1. A method for manufacturing an annular weather strip in which both ends of a linear weather strip are connected to form an annular weather strip, The weather strip is attached to a door opening edge of a vehicle and includes a mounting portion having a U-shaped cross section with a core material embedded therein and a lip on the inside, a pair of dies are prepared, the dies including a body portion having a cavity formed therethrough, the cavity being defined along the outer periphery of the cross section of the weather strip; and a slide core extending over the entire length of the cavity, and extending in the opposite direction to the opening side until it abuts on the mounting portion inside the mounting portion when the weather strip is inserted into the cavity, and being removable to the opening side of the mounting portion; removing the core material from the attachment portions at both ends of the weather strip by a predetermined length in the longitudinal direction of the weather strip; a step of inserting both ends of the weather strip into the pair of dies so that one end of the die coincides with an end of the weather strip; a step of connecting both ends of the weather strip inserted into the pair of dies via a sheet material sandwiched between the both ends, and pouring a softened sheet material into a cavity at each end from which the core material has been removed, a projection portion is formed on one end of the slide core, which projection protrudes in a direction perpendicular to the removal direction and contacts the mounting portion further away from the lip which, in an end view of the weatherstrip inserted into the mold, is tilted toward the away-opening side by interfering with the slide core so as to contact the mounting portion, and the radius of curvature of the concave R at the base of the projection portion is set larger than the radius of curvature of the convex R at the tip of the lip.

2. A method for connecting weather strips, which connects ends of weather strips each having a U-shaped cross-section mounting portion with a core material embedded therein and a lip on the inside, comprising: a pair of dies are prepared, the dies including a body portion having a cavity formed therethrough, the cavity being defined along the outer periphery of the cross section of each of the weather strips; and a slide core extending over the entire length of the cavity, and extending in the opposite direction to the opening side until it abuts on the mounting portion inside the mounting portion when each of the weather strips is inserted into the cavity, and capable of being removed to the opening side of the mounting portion; removing the core material from the attachment portion at the end of each weather strip by a predetermined length in the longitudinal direction of each weather strip; inserting an end of each weatherstrip into the mold so that one end of the mold coincides with an end of each weatherstrip; a step of connecting the ends of the weather strips inserted into the pair of dies via a sheet material sandwiched between the ends, and pouring a softened sheet material into a cavity at the ends from which the core material has been removed, a projection portion is formed on one end of the slide core, which, in an end view of each weatherstrip inserted into the mold, protrudes in a direction perpendicular to the removal direction and contacts the mounting portion, further away from the lip which, in a direction opposite to the opening direction, is tilted away from the opening direction so as to contact the mounting portion by interfering with the slide core, and the radius of curvature of the concave R at the base of the projection portion is set larger than the radius of curvature of the convex R at the tip of the lip.

3. A mold for connecting ends of a weather strip having a mounting portion with a U-shaped cross section and an inner lip, via a sheet material, the mold retaining a predetermined cross-sectional shape of the end portion from which the core material has been removed by a predetermined length in the longitudinal direction of the weather strip, a body portion having a cavity formed therethrough, the cavity being defined along the outer periphery of a cross section of the weather strip; and a slide core extending over the entire length of the cavity, and when the weather strip is inserted into the cavity, extending inside the mounting portion toward the side opposite the opening until it abuts on the mounting portion and being removable toward the opening side of the mounting portion; a projection portion that projects in a direction perpendicular to the removal direction and contacts the mounting portion on the anti-opening side further than the lip that leans against the anti-opening side so as to contact the mounting portion by interfering with the slide core in an end view of the weatherstrip when the weatherstrip is inserted into the cavity so that the one end of the slide core and the end of the weatherstrip coincide with each other, and the radius of curvature of the concave R of a base portion of the projection portion is set larger than the radius of curvature of the convex R of the tip portion of the lip.

4. In the mold according to claim 3, a tip end portion of the protrusion, which contacts the mounting portion when the weather strip is inserted into the cavity, has an R-shape when viewed in the extension direction of the slide core.

5. In the mold according to claim 3, the protrusion is formed in a range corresponding to a predetermined length for removing the core material from one end of the slide core, A mold characterized in that the slide core is formed so that its cross-sectional area becomes smaller toward the other side when viewed in an extending direction of the slide core.

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