JP5407759B2 - Weather strip manufacturing method - Google Patents

Description

The present invention relates to a manufacturing method of Uezasutori' flop for sealing between the opening and closing member for opening and closing the opening the opening of the body.

  Conventionally, a weather strip is attached to the periphery of an opening formed in a body (vehicle body) of an automobile or the like. The weather strip includes a trim portion having a substantially U-shaped cross section as a mounting base portion attached to a flange portion provided along the periphery of the opening portion, and a hollow seal portion that protrudes from the trim portion and has a hollow portion. ing. When the opening / closing member that opens and closes the opening is closed, the hollow seal portion is pressed against the peripheral edge of the opening / closing member, thereby sealing between the body and the opening / closing member.

  This type of weather strip is generally formed in an annular or longer shape by joining the ends of one or a plurality of extruded portions formed in an elongated shape by extrusion. In other words, with the end portions of the extrusion-molded portion being supported and fixed in the mold apparatus, the end portions are formed by injection molding between the end portions so that the end portions are connected to each other so as to be annular or longer. A scaled weather strip is formed.

  In the weather strip having the hollow seal portion as described above, it is necessary to arrange a core mold for forming the hollow portion in the cavity in the mold apparatus when the mold forming portion is formed. The core mold includes a core main body for forming a hollow portion and a gripping portion that protrudes outward from the core main body. Most of the core body is wrapped with an elastic material such as rubber. However, after the molding part is molded, it is necessary to remove the core body from the hollow seal part of the molded product.

  For this reason, conventionally, it has been necessary to provide a so-called “core punch hole” in the hollow seal portion in the vicinity of the end of the extrusion molding portion (see, for example, Patent Document 1). ). In such a configuration, a step of forming a core punched hole before molding is required, and the core main body is disposed through the core punched hole, and the hollow seal portion of the other extrusion-molded portion is disposed at the tip of the core main body. If the end of the core body has to be tapered in consideration of ease of insertion, the insertion margin and the width of the molded part are widened, resulting in problems such as reduced productivity and increased cost. There was a risk of it occurring.

  On the other hand, the technique etc. which oppose the edge part of an extrusion molding part on both sides of the sheet | seat material used as an adhesive medium, and heat-process and join are proposed (for example, refer patent document 2). With such a configuration, the width of the connection portion can be reduced, but the hollow portion is blocked at the connection portion, and thus the load at the time of closing the opening / closing member may increase locally in the vicinity of the connection portion. is there. In addition, it is necessary to adjust the length of the extrusion molding part and position the end part more strictly according to the thickness of the sheet material, and the groove part of the trim part is also blocked, so the sheet material is removed after the joining process. The cutting process becomes indispensable, and there is a risk that problems such as a decrease in productivity and an increase in cost may occur. Furthermore, a step is likely to occur between the extrusion-molded portion and the joint portion, and there is a concern about a decrease in sealing performance.

  As a technique capable of suppressing a decrease in productivity and an increase in cost as compared with the above-described conventional technique, a technique for providing a core hole in the range of a molded part is also disclosed (for example, see Patent Document 3).

Japanese Utility Model Publication No.59-169929 JP 2000-263649 A JP-A-7-164978

  However, the weather strip described in Japanese Patent Application Laid-Open No. 7-164978 has a relatively large width (connection width) of the molded portion in the longitudinal direction of the weather strip, and the opening formed there is only a core hole. In addition, since it has a relatively large opening area that is also used as an air vent hole, the appearance is poor, and there is a risk of deteriorating the appearance quality.

  Furthermore, since a large opening is formed in the mold forming portion, a load difference applied when the opening / closing member is closed increases between the mold forming portion and the extrusion forming portion in the vicinity thereof, and the sealing performance may be deteriorated. .

  Furthermore, in order to prevent this load difference from increasing, the weather strip described in Japanese Patent Application Laid-Open No. 7-164978 has a support lip that supports the hollow seal portion and closes the opening portion when the opening / closing member is closed. Is provided. If such a support lip is provided, it may be difficult to perform the core removal operation.

The present invention has been made to solve the above-described problems, and its purpose is to improve the appearance quality and sealing performance of a weather strip when manufacturing a weather strip in which an extrusion molding portion is connected by a molding portion. It is an object of the present invention to provide a method for producing a weather strip that allows a core mold to be pulled out in a relatively narrow width within the range of a molded part without causing a drop or the like.

  In the following, each means suitable for solving the above problem will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1 . It is composed of an extrusion-molded part that has been extruded and a mold-molded part that is molded by a mold device composed of a plurality of mold members so that the ends of the extrusion-molded part are connected linearly,
An attachment base attached to the periphery of the opening of the body or the periphery of the opening / closing member that opens and closes the opening;
A weatherstrip manufacturing method comprising a hollow seal portion provided so as to protrude from the mounting base and being pressed against a mating member when the opening / closing member that opens and closes the opening is closed,
Of the core mold member consisting of a core body that molds the inner peripheral surface of the hollow seal portion of the mold molding part and a gripping part that protrudes from the core body when molding the mold molding part, both ends of the core body are The core mold member so that the connection width of the molded part in the longitudinal direction of the weather strip is 0.5 mm or more and 3.0 mm or less in a state where each is inserted into the end of the hollow seal part of the extruded part. Is set at a predetermined position of the mold apparatus, the mold member is closed, a cavity is formed in the mold apparatus, and a material for the mold forming part is filled in the cavity to form a mold forming part. With
In the mold forming part, at least the gripping part has a core extraction hole for extracting the core main body after forming in a range excluding the seal surface pressed against the mating member of the hollow seal part. The length along the circumferential direction of the inner circumferential surface of the seal portion is formed so as to be 25% or more and 45% or less of the circumferential length of the inner circumferential surface,
After forming the mold forming part and opening the mold member of the mold apparatus, the core body is removed from the core punching hole ,
Among the plurality of mold members, in a predetermined mold member facing the outer peripheral surface of the core main body, a locking protrusion is formed to latch the extrusion molding portion inserted into the core main body. A weatherstrip manufacturing method.

According to the above means 1 , the core punching hole for extracting the core mold member used for forming the hollow seal part of the mold forming part after forming is the mold forming part itself (relatively narrow width within the range of the mold forming part). Is provided. That is, in this means, since the connection width of the mold forming part is relatively narrow as 0.5 mm or more and 3.0 mm or less, and the opening area of the core punching hole opened there is also relatively small, Becomes inconspicuous. As a result, appearance can be improved and appearance quality can be improved.

If the connection width of the molded part is less than 0.5 mm, the gripping part that supports the core body of the core mold member must be very thin, and it is difficult to ensure the strength of the core mold member. The durability of the mold may be reduced. On the other hand, when the connection width of the molded part exceeds 3.0 mm, the appearance may be deteriorated.

Moreover, the core hole of this means is formed so that the length along the circumferential direction of the inner peripheral surface of the hollow seal portion is not less than 25% and not more than 45% of the peripheral length of the inner peripheral surface. In consideration of the peripheral length of the inner peripheral surface (the outer peripheral surface of the core body) of the hollow seal portion of a general weather strip being 30 mm to 50 mm, the core punched hole is formed over the entire connection width of the mold forming portion ( Even if it is provided at a maximum of 3.0 mm, the core hole of this means is longer in the circumferential direction of the hollow seal portion than in the longitudinal direction of the weather strip. In addition, the process of forming a cored hole in advance in an extrusion molding part becomes unnecessary. In addition, it is not necessary to use a special sheet material or the like for connecting the extruded portions as described in the background art. As a result, productivity reduction and cost increase can be suppressed.

Further, since the hollow seal portion is not blocked by the sheet material, there is no possibility that the load when the opening / closing member is closed is locally increased in the vicinity of the connection portion. Furthermore, a level difference is unlikely to occur between the molded part and the extrusion part, and a decrease in sealing performance can be suppressed.

In addition, according to the configuration of the present means, the mold forming portion and its portion can be provided without providing a support lip or the like as described in the above background art for supporting the hollow seal portion while closing the opening / closing member and closing the core hole. The load difference applied when closing the opening / closing member between the adjacent extruded portions does not increase.

As a result, according to this means, the weatherstrip sealability and appearance quality are not deteriorated.

Na you, in this unit, the partial width of the cored hole for weather strip longitudinal direction is relatively narrow set to 3.0mm at the most, to some extent ensure a length of cored holes in the circumferential direction of the hollow seal portion There is a need to. Depending on the length of the core body in the longitudinal direction of the weather strip, in order to perform the core removal operation of the core body that can form a hollow seal part with a width of at least 3.0 mm, It is preferable that the length of the core extraction hole along the direction is at least 25% of the peripheral length of the inner peripheral surface (the outer peripheral surface of the core body) of the hollow seal portion. If the length of the core punching hole is less than 25% of the peripheral length of the inner peripheral surface of the hollow seal portion, the core mold member cannot be easily pulled out, and there is a risk of problems such as the core punching hole periphery being broken. There is.

  On the other hand, if the length of the hollow seal portion in the circumferential direction is too long, it is difficult to secure the seal surface and prevent water from entering. For this reason, it is preferable that the length of the core hole in the circumferential direction of the hollow seal portion is 45% or less of the circumferential length of the inner peripheral surface of the hollow seal portion.

Further , according to the above means 1 , by providing the locking projection, it is possible to hold the extrusion molded portion sufficiently without holding a relatively wide range in the longitudinal direction, and at the time of material injection into the cavity. It is possible to reduce the possibility that the extruded part is detached from the core body due to the injection pressure. Thereby, since the insertion amount of the core main body into the extrusion molding portion can be reduced, the length of the core main body can be shortened, and the core punched hole can be formed relatively small. As a result, the core removal operation can be easily performed, productivity can be improved, and appearance quality can be improved.

  It is also possible to provide a locking projection on the core body. However, since the core main body becomes large and it becomes difficult to perform the insertion / extraction operation of the core main body, it is preferable to provide the locking protrusion only on the opposing mold member.

Means 2 . The method for producing a weather strip according to means 4 or 5, wherein an olefinic thermoplastic elastomer (TPV) having an IRHD of 40 degrees is used as a material of the mold part.

According to the above means 2 , the repulsive forces of the hollow seal part of the mold part and the hollow seal part of the extrusion part can be made equal, and the deterioration of the sealing performance can be prevented. In addition, it seems that the rigidity of the mounting base of the molded part is lower than that of the extruded part and the mounting stability is poor. However, the molded part is a short section with respect to the longitudinal direction of the weather strip. In addition, since the rigidity of the mounting base portions of the adjacent extrusion molding portions assists, mounting stability does not deteriorate even if it is composed of a soft TPV. Furthermore, since the entire mold forming part can be made of a single material (soft TPV) in accordance with the rigidity of the hollow seal part, it can be easily and inexpensively formed as compared with two-color molding in accordance with the rigidity of each part. Normally, when molding the mold forming part, both ends of the core body are respectively inserted into the end of the hollow seal part of the extrusion molding part, set in the mold apparatus, and put into the cavity of the mold apparatus. Supply. The end portion of the extrusion molding portion is sandwiched between the core main body and a predetermined mold member so that the extrusion molding portion does not come off from the core main body due to the injection pressure at this time. However, conventionally, a sponge rubber material such as EPDM used as a material for a molding part has a relatively high viscosity and needs to be injected at a high pressure, so that it has been necessary to sandwich a wide range in the longitudinal direction of the extrusion part. . In other words, it is necessary to increase the insertion amount of the core body at both ends of the extrusion molding portion, and the length of the core body itself, and hence the length of the core punching hole for removing the core body, is longer than the longitudinal direction of the weather strip. There was a risk of becoming. In addition, since rubber materials such as EPDM need to be vulcanized by applying high heat to the mold member, there is a possibility that the trace may remain at the end of the extrusion molded part pressed by the mold member. .

  On the other hand, according to this means, since the material of the molding part has a lower viscosity than EPDM or the like and is composed of TPV that does not require vulcanization, the end of the extrusion part is caused by the injection pressure of the material. The possibility of coming off from the core body is reduced. As a result, it is possible to shorten the range in which the extrusion forming part is sandwiched, facilitating the core removal operation, improving the productivity, and improving the appearance quality.

  Furthermore, by using TPV, the vulcanization step can be omitted, productivity can be improved, and the above traces are not left in the extrusion-molded portion. Further, as compared with the case where a rubber material is used, blurring or the like is less likely to occur at the periphery of the core extraction hole in the core extraction operation.

Further, even when the outer peripheral surface of the hollow seal portion of the extrusion-molded portion is locked by the locking projection as in the above-described means 1 , the effect is great because the trace is hardly left.

Means 3 . During the molding, a predetermined mold member of the plurality of mold members is disposed so as to abut on the circumferential side of the hollow seal portion in the grip portion and abut against the core body. In addition, after the cavity is filled with a material, the predetermined mold member is relatively separated from the core mold member, so that a part of the core punching hole is formed. A method for producing a weather strip according to means 1 or 2 .

According to the means 3 , a part of the core punching hole is formed not only by the grip portion of the core mold member but also by the predetermined mold member in contact therewith. That is, a cored hole longer than the width of the gripping part is formed in the circumferential direction of the hollow seal part. As a result, the core punching hole can be opened wider with respect to the longitudinal direction of the weather strip, so that the core punching operation can be performed more easily.

It is a perspective view which shows the luggage room etc. of a motor vehicle. It is a front view of the weather strip of this invention. It is the JJ sectional view taken on the line of FIG. 2 which shows the weather strip of this invention. It is the LL sectional view taken on the line of FIG. 2 which shows the weather strip of this invention. It is a perspective view which shows the shaping | molding part of the weather strip of this invention. It is the KK sectional view taken on the line of FIG. 2 which shows the weather strip of this invention. It is a partially expanded sectional view which shows the hollow seal part etc. of the shaping | molding part of this invention. It is sectional drawing which shows the metal mold | die apparatus for the shaping | molding part shaping | molding of this invention. It is sectional drawing of the metal mold | die apparatus which shows the state which filled the material in the cavity of this invention. It is sectional drawing which shows the various metal mold | die of the state by which the extrusion molding part of this invention was engage | inserted. It is a perspective view which shows the shaping | molding part of the weather strip of another embodiment of this invention.

  Hereinafter, an embodiment will be described with reference to the drawings. As shown in FIG. 1, an automobile 1 as a vehicle is provided with a luggage door 2 as an opening / closing member that opens and closes an opening 4 of a luggage room formed in a body 3 as a vehicle body. Further, a weather strip 5 is provided at the periphery of the opening 4 to seal between the luggage door 2 and the periphery of the opening 4 when the luggage door 2 is closed.

  As shown in FIG. 2, the weather strip 5 of the present embodiment is formed by an extrusion molding portion 6 that is formed substantially linearly by extrusion molding, and a die molding that linearly connects both end portions of the extrusion molding portion 6. Part 7 (the part to which the dotted pattern is given in FIG. 2 and FIG. 5).

  As shown in FIG. 3, the extruded portion 6 includes an inner peripheral side wall portion 12, an outer peripheral side wall portion 13, and a connecting portion 14 that connects both side wall portions 12 and 13, and has a substantially U-shaped cross section. And a hollow seal portion 15 that protrudes from the connecting portion 14 to the vehicle outer side (upper left in FIG. 3) and has a hollow portion 15a therein. Further, a front end lip 41 extending toward the outer side of the vehicle and the outer periphery of the opening 4 (upper right in FIG. 3) is provided at the front end (top) in the protruding direction of the hollow seal portion 15. Further, a metal insert 17 is embedded in the trim portion 11 of the extrusion molding portion 6 along the longitudinal direction thereof.

  In addition, a flange portion 33 is formed on the periphery of the opening portion 4 by folding a panel constituting the body 3 outward of the vehicle. The weather strip 5 is attached to the periphery of the opening 4 by relatively fitting the flange portion 33 inside the trim portion 11. Further, when the luggage door 2 is closed, the hollow seal portion 15 is pressed against the peripheral edge portion of the luggage door 2 at the portion including the tip lip 41 and is crushed and deformed (see the two-dot chain line in FIG. 3). 2 and the body 3 are sealed.

  As shown in FIG. 1, the rear ceiling portion of the automobile 1 of the present embodiment is inclined downward toward the rear, and the luggage room provided at the rear portion of the automobile 1 is an upper portion in accordance with the shape of the ceiling portion. A portion that opens obliquely, and a portion that also opens rearward so as to facilitate loading and unloading. In other words, the opening 4 has an upper edge extending in the vehicle width direction, a side edge extending obliquely downward and downward from both ends of the upper edge, and a lower side from the rear end of each side edge. A vertical edge portion extending and a lower edge portion extending so as to connect lower end portions of both vertical edge portions are provided. However, in the present embodiment, the vertical edge portion does not extend in the vertical direction, but extends slightly inclined backward toward the lower side. Hereinafter, in the opening 4, a portion surrounded by the upper edge and both side edges is referred to as an upper opening surface 4 a, and a portion surrounded by the lower edge and both vertical edges is referred to as a lower opening surface 4 b.

  Moreover, the flange part 33 formed along the periphery of the opening part 4 is extended perpendicularly | vertically with respect to the corresponding opening surfaces 4a and 4b toward the vehicle outer side. More specifically, a portion of the flange portion 33 corresponding to the upper edge portion of the opening portion 4 extends upward in a slightly inclined direction (see FIG. 3), and the lower edge of the opening portion 4. The part corresponding to the part extends in a direction slightly inclined upward (see FIG. 4). In the present embodiment, the weather strip 5 is attached to the flange portion 33 so that the mold forming portion 7 is positioned at the center of the lower edge portion of the opening 4.

  Further, the hollow seal portion 15 projects outward from the connecting portion 14 of the trim portion 11 along the extending direction of the corresponding flange portion 33. That is, the portion of the weather strip 5 corresponding to the upper edge portion of the opening 4 (hereinafter referred to as the upper side portion 5a) is inclined slightly downward from the connecting portion 14 of the trim portion 11 upward. 3 (see FIG. 3) and a portion corresponding to the lower edge portion of the opening 4 (hereinafter referred to as the lower side portion 5b) is inclined slightly upward from the connecting portion 14 of the trim portion 11 toward the rear. It protrudes (see FIG. 4). As a result, the hollow seal portion 15 has a luggage door perpendicular to each of the opening surfaces 4a and 4b (in the extending direction of the flange portion 33) at a portion including the tip lip 41 provided at the tip portion in the protruding direction. 2 and pressure contact.

  Further, the trim portion 11 is provided with an inner peripheral holding lip 21 extending from the inner side surface of the inner peripheral side wall portion 12 and an outer peripheral side holding lip 22 extending from the inner side surface of the outer peripheral side wall portion 13. ing. Two inner peripheral holding lips 21 and two outer peripheral holding lips 22 are provided at a predetermined distance in the direction in which the trim portion 11 is attached to the flange portion 33. Then, by relatively fitting the flange portion 33 inside the trim portion 11, the inner peripheral holding lip 21 and the outer peripheral holding lip 22 are pressed against the flange portion 33, and the elastic force by the holding lips 21, 22, etc. The weather strip 5 is attached based on the above.

  Furthermore, the extrusion molding part 6 extends from the inner peripheral side wall part 12 to the inner peripheral side of the opening part 4 and covers a design lip 23 that covers the edge of the interior member 29, and the outer peripheral side wall part 13 to the outer periphery of the opening part 4. A draining lip 24 that extends to the side and contacts the panel (outer panel) constituting the body 3, and a sub lip 25 that extends from the distal end of the outer peripheral side wall 13 to the inner peripheral side of the opening 4 and contacts the outer panel I have.

  In this embodiment, the trim part 11 and the holding lips 21 and 22 are basically made of solid EPDM (ethylene-propylene-diene copolymer rubber), and have a hollow seal part 15, a design lip 23, a draining lip 24, The sub lip 25 is made of sponge EPDM. However, the outer peripheral side holding lip 22 on the base side of the flange portion 33 is made of sponge EPDM.

  Further, the extruded portion 6 includes a seal protrusion 27 having a substantially semicircular cross section that protrudes from the inner surface of the connecting portion 14 to the inside of the trim portion 11. When the weather strip 5 is attached to the flange portion 33, the seal projection 27 and the leading edge of the flange portion 33 are in contact with each other. Due to the presence of the seal protrusion 27 and the draining lip 24 and the sub lip 25, it is possible to more reliably prevent a situation in which rainwater or the like enters the indoor side (luggage room) from between the trim portion 11 and the flange portion 33. be able to.

  On the other hand, as shown in FIG. 5, the molding part 7 is formed so that the connection width W1 in the weather strip longitudinal direction (left-right direction in FIG. 5) is 2.0 mm. As shown in FIG. 6, the mold forming portion 7 basically has substantially the same cross-sectional shape as the extrusion forming portion 6, and includes a trim portion 11, a hollow seal portion 15, and the like. However, in the molded part 7, the seal protrusion 27 is omitted in that the entire part is made of a dynamically crosslinked olefinic thermoplastic elastomer (TPV) having an IRHD (international rubber hardness) of 40 degrees. This is different from the extruded portion 6 in that the insert 17 is not provided.

  Furthermore, in the mold forming part 7, as shown in FIGS. 5 to 7, a core mold member 58 for forming the inner peripheral surface 15b (hollow part 15a) of the hollow seal part 15 of the mold forming part 7 is provided. A core hole 44 is formed for extraction after molding. Although details of the core mold member 58 will be described later, hereinafter, the term “member” is omitted for the other mold members including the core mold member 58 and expressed.

  The core punching hole 44 is formed in a portion of the hollow seal portion 15 that is located on the lower side in the attached state to the flange portion 33 in a range excluding the range W2 that becomes a seal surface that is in pressure contact with the luggage door 2.

  The core punching hole 44 is set in the entire area (2.0 mm width) of the molded part 7 in the weather strip longitudinal direction, and the length W3 along the circumferential direction of the inner peripheral surface 15b of the hollow seal part 15 is It is set to be 40% of the peripheral length of the inner peripheral surface 15b.

  Next, a mold apparatus 51 for forming the mold forming part 7 will be described. FIG. 8 is a cross-sectional view showing a mold apparatus 51 used for forming the mold forming portion 7. The mold apparatus 51 includes, for example, a fixed mold 52 located on the lower side of the figure, and a plurality of movable molds (first movable mold 53, second movable mold 54, third movable mold 55, and fourth movable mold). 56 and a fifth movable mold 57). A core mold 58 is provided between the fixed mold 52 and the fourth movable mold 56. The first to fifth movable molds 53 to 57 are provided so as to be movable relative to the fixed mold 52 by a cylinder or the like (not shown). The core mold 58 includes a core body 59 and a grip portion 60 that extends integrally from the core body 59.

  As shown in FIG. 10, in the core body 59, the length W4 of the insertion portion 59a inserted into the hollow seal portion 15 is set to 3.0 mm, and the thickness W5 of the grip portion 60 is set to 2.0 mm. Is set.

  The fixed mold 52 and the movable molds 53 to 57 are each formed with a molding surface corresponding to the outer shape of the mold molding unit 7. The core body 59 is for forming the inner peripheral surface 15b (hollow portion 15a) of the hollow seal portion 15, and is installed in the center of the space surrounded by the fixed die 52 and the movable dies 53 to 57. Is done. A cavity 61 for forming the mold forming portion 7 is formed by these forming surfaces and the outer surface of the core body 59.

  Further, as shown in FIG. 10, the first movable die 53 is used for retaining the extrusion molding portion 6 fitted in the insertion portion 59 a at a position facing the outer peripheral surface of the insertion portion 59 a of the core body 59. A pair of locking projections 53a is formed. The pair of locking projections 53a have a triangular shape in cross section along the weather strip longitudinal direction (vertical direction in FIG. 10), and surfaces orthogonal to the molding surface of the first movable mold 53 are opposed to each other. It is formed to do. Although illustration is omitted, the fifth movable mold 57 is also formed with similar locking projections.

  Next, the manufacturing method of the weather strip 5 having the above-described configuration and the function and effect in manufacturing will be described.

  First, the extrusion molding part 6 is shape | molded by the well-known extrusion molding method using the extruder which is not shown in figure. And the extrusion molding part 6 is cut | disconnected by the predetermined | prescribed length according to the circumferential length of the flange part 33 of the opening part 4 of the luggage room to be mounted | worn.

  Subsequently, the both ends of the extrusion molding unit 6 are connected by the mold molding unit 7. More specifically, in a state where the molds 52 to 57 and the like are opened from each other, the elongated extruded portion 6 is curved in accordance with the shape of the opening 4 of the luggage room, and both end portions thereof face each other. The hollow seal portion 15 is fitted into both ends in the longitudinal direction (vertical direction in FIG. 10) of the core body 59 of the core mold 58, and the movable molds 53 to 57 and the core mold 58 are set at predetermined positions with respect to the fixed mold 52. Tighten the mold. Thereby, the extrusion molding part 6 is attached and fixed to the mold apparatus 51, and a cavity 61 is formed as shown in FIG.

  When the mold clamping is completed, as shown in FIG. 10, the extruded part 6 fitted into the core body 59 is in a state where both ends thereof are spaced apart by the connection width W1 (2.0 mm) of the mold part 7. At the same time, and the locking projection 53a of the first movable die 53 and the like prevent the dropout from the core body 59.

  In the clamped state, as shown in FIG. 8, the fixed mold 52 abuts against the lower surface of the core body 59 and also contacts the surface of the grip 60 that is continuous with the lower surface of the core body 59. It touches.

  Then, from this state, as shown in FIG. 9, TPV in a plasticized state is injected into the cavity 61 from a gate (not shown) and filled. Thereafter, the TPV is solidified. At this time, the hollow seal portion 15 of the mold forming portion 7 is formed with a core punching hole 44 due to the presence of the gripping portion 60 and the fixed die 52 in contact therewith.

  After the solidification is completed, the movable dies 53 to 57 are sequentially opened, and the molded die molding part 7 is released from the fixed die 52 together with the core die 58.

  At this stage, the core body 59 is exposed at a portion where the core body 59 and the fixed mold 52 are separated from each other. That is, a part of the core hole 44 is opened.

  Subsequently, the core main body 59 is taken out from the core punching hole 44 by gripping the gripping portion 60 and pulling it out of the hollow seal portion 15 while separately supporting the mold forming portion 7. Thereby, a hollow portion 15 a is formed inside the hollow seal portion 15.

  In this way, an annular weather strip 5 in which both end portions of the extruded portion 6 are connected and formed by the molded portion 7 is obtained.

  As described above in detail, according to the present embodiment, the core forming hole 7 is provided in the mold forming part 7 itself for extracting the core mold 58 used for forming the hollow seal part 15 of the mold forming part 7 after forming. It is done. For this reason, the process of forming a core hole in the extrusion molding part 6 beforehand becomes unnecessary. Further, it is not necessary to use a special sheet material or the like for connection of the extrusion molding unit 6. As a result, productivity reduction and cost increase can be suppressed.

  Further, since the hollow seal portion 15 is not blocked by the sheet material, there is no possibility that the load when the luggage door 2 is closed is locally increased in the vicinity of the connection portion. Furthermore, it is difficult for a step to be formed between the mold part 7 and the extrusion part 6, and a decrease in sealing performance can be suppressed.

  In addition, since the connection width W1 of the molding part 7 is relatively narrow as 2.0 mm, and the opening area of the core hole 44 opened there is also relatively small, the mold part 7 and the core hole 44 are hardly noticeable. It will be a thing. As a result, appearance can be improved and appearance quality can be improved.

  Further, since the opening area of the core hole 44 is relatively small, the mold forming part 7 and its molding part 7 can be provided without providing a support lip or the like for closing the core hole 44 while supporting the hollow seal part 15 when the luggage door 2 is closed. The load difference applied when the luggage door 2 is closed between the adjacent extruded portions 6 does not increase. Further, there is no need to provide a support lip or the like that hinders the core removal operation.

  The core punching hole 44 has a length W3 along the circumferential direction of the inner circumferential surface 15b of the hollow seal portion 15 corresponding to the inner circumferential surface 15b, because the width in the longitudinal direction of the weather strip is set to be relatively narrow at 2.0 mm. Since it is set to be relatively long so as to be 40% of the circumferential length of the surface 15b, there is no possibility that it is difficult to perform the core removal operation.

  As a result, according to the weather strip 5 and the manufacturing method thereof of the present embodiment, the core mold 58 can be easily extracted without causing deterioration in sealing performance or appearance quality.

  In addition, the first movable mold 53 and the like are formed with a pair of locking projections 53a for locking the extruded portion 6 fitted into the core body 59. Thereby, the possibility that the extruded portion 6 may be detached from the core body 59 due to the injection pressure at the time of material injection into the cavity 61 can be reduced.

  Further, the molding part 7 is made of TPV having an IRHD of 40 degrees, which has a lower viscosity than a rubber material such as EPDM and does not require vulcanization, and the extrusion molding part 6 is detached from the core body 59 by the injection pressure of the material. There is little fear.

  As a result, it is possible to shorten the range in which the extrusion forming portion 6 is sandwiched as compared with the case of molding with a rubber material. Moreover, since the length W4 of the insertion part 59a of the core main body 59 can be set to 3.0 mm as in this embodiment, the insertion amount of the core main body 59 into the extrusion molding part 6 can be reduced. The length of the core body 59 can be shortened, and as a result, the core hole 44 can be formed relatively small.

  In addition, by using TPV, there is no trace left on the extrusion molding portion 6 when the rubber material is vulcanized, and traces locked by the locking projections 53a hardly remain. Become. Furthermore, by using TPV, the vulcanization step can be omitted, and blurring or the like is less likely to occur at the peripheral edge of the core extraction hole 44 in the core extraction operation compared to the case where a rubber material is used.

  As a result, the core removal operation can be easily performed, productivity can be improved, and appearance quality can be improved.

  Further, at the time of mold forming, a part of the core punching hole 44 is formed not only by the gripping portion 60 of the core mold 58 but also by the fixed mold 52 in contact therewith. That is, a cored hole 44 longer than the width of the gripping part 60 is formed in the circumferential direction of the hollow seal part 15. As a result, the core punching hole 44 can be opened more widely in the weather strip longitudinal direction, so that the core punching operation can be performed more easily.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the above embodiment, the weather strip 5 is mounted on the periphery of the opening 4 of the luggage room. However, the present invention is not limited thereto, and may be embodied in another weather strip. For example, it may be applied to a door weather strip 500 that is provided with a flat mounting base 511 and a hollow seal 515 as shown in FIG. The core hole in this embodiment is 544. In the above embodiment, the hollow seal portion (15) is provided with the tip lip (41). However, the door seal 515 does not have the tip lip provided on the hollow seal portion (515). May be good.

  (B) In the said embodiment, although the connection width W1 in the weather strip longitudinal direction of the shaping | molding part 7 is set to 2.0 mm, the connection width W1 is not limited to this. However, if the connection width W1 of the molding part 7 is less than 0.5 mm, the gripping part 60 of the core mold 58 must be very thin, and it is difficult to ensure the strength of the core mold 58. There is a risk that the durability of the mold device 51 may be reduced. On the other hand, when the connection width W1 of the molded part 7 exceeds 3.0 mm, the appearance may deteriorate. Therefore, it is preferable that the connection width W1 of the molding part 7 is set to 0.5 mm or more and 3.0 mm or less.

  (C) In the above embodiment, the length W3 of the core hole 44 along the circumferential direction of the inner peripheral surface 15b of the hollow seal portion 15 is set to be 40% of the peripheral length of the inner peripheral surface 15b. However, the length W3 of the core hole 44 is not limited to this. However, when the length W3 of the core punching hole 44 is less than 25% of the peripheral length of the inner peripheral surface 15b of the hollow seal portion 15, the core body 59 cannot be easily pulled out, and the periphery of the core punching hole 44 is broken. May cause problems. On the other hand, when the length W3 of the core hole 44 exceeds 45% of the peripheral length of the inner peripheral surface 15b of the hollow seal portion 15, it may be difficult to secure the seal surface and prevent water from entering. is there. Therefore, it is preferable that the length W3 of the core hole 44 is set to be 25% or more and 45% or less of the peripheral length of the inner peripheral surface 15b of the hollow seal portion 15.

  (D) In the above embodiment, the mold forming part 7 is made of TPV, but is not particularly limited to such a structure. For example, a non-crosslinked olefinic thermoplastic elastomer (TPO) or the like is used. It is good also as comprising with another material. Also, the hardness of TPV of IRHD 20 degrees to 60 degrees can be used.

  (E) In the above embodiment, the core hole 44 is formed in a portion of the hollow seal portion 15 that is positioned on the lower side in the attached state to the flange portion 33. The formation position of the core punching hole 44 is not limited to this. For example, when the length W3 of the core punching hole 44 is relatively short at 25% of the peripheral length of the inner peripheral surface 15b of the hollow seal portion 15, etc. In the hollow seal portion 15, the hollow seal portion 15 may be formed in a portion located on the upper side in the attached state to the flange portion 33 in a range excluding the range W <b> 2 that becomes a seal surface pressed against the luggage door 2. However, it is preferable that the cored hole 44 is formed facing downward because it is less likely to be noticed by the user after the weather strip 5 is mounted.

(F) In the above embodiment, the first movable mold 53 and the like are formed with a pair of locking projections 53a having a right-angled triangular cross section for locking the extruded portion 6 fitted into the insertion portion 59a of the core body 59. . The configuration of the locking protrusion 53a is not limited to the above embodiment, and for example, an isosceles triangle section or a quadrangular section may be employed. However, in terms of preventing the extrusion forming portion 6 from coming off, it is preferable that the opposing surfaces of the pair of locking projections have orthogonal surfaces orthogonal to the weather strip longitudinal direction as in the above-described embodiment .

  Although it is possible to provide a locking projection on the core body 59 side, in such a case, the core body 59 becomes large and it becomes difficult to perform the core removal operation. Since there is a possibility that the peripheral edge of the core punching hole 44 may be damaged, it is more preferable that the core punching hole 44 is provided on the first movable mold 53 facing the core body 59.

  (G) In the above-described embodiment, at the time of mold forming, a part of the core punching hole 44 is formed not only by the gripping portion 60 of the core mold 58 but also by the fixed mold 52 in contact therewith. However, the configuration is not limited thereto, and the core punching hole 44 may be formed only by the gripping portion 60 of the core mold 58.

DESCRIPTION OF SYMBOLS 1 ... Automobile, 2 ... Luggage door, 3 ... Body, 4 ... Opening part, 5 ... Weather strip, 6 ... Extrusion part, 7 ... Molding part, 11 ... Mounting base (trim part), 12 ... Inner peripheral side Side wall part, 13 ... Outer peripheral side wall part, 14 ... Connection part, 15 ... Hollow seal part, 15a ... Hollow part, 15b ... Inner peripheral surface, 44 ... Core punching hole, 51 ... Mold device, 52 ... Fixed mold, 53 57 ... movable mold, 53a ... locking projection, 58 ... core mold, 59 ... core body, 60 ... gripping part, 61 ... cavity, W1 ... connection width of the molding part, W2 ... range of the sealing surface, W3 ... Length of core punching hole, W4 ... length of insertion part, W5 ... thickness of gripping part, 500 ... door weather strip, 511 ... mounting base, 515 ... hollow seal part, 544 ... core punching hole.

Claims (3)

It is composed of an extrusion-molded part that has been extruded and a mold-molded part that is molded by a mold device composed of a plurality of mold members so that the ends of the extrusion-molded part are connected linearly,
An attachment base attached to the periphery of the opening of the body or the periphery of the opening / closing member that opens and closes the opening;
A weatherstrip manufacturing method comprising a hollow seal portion provided so as to protrude from the mounting base and being pressed against a mating member when the opening / closing member that opens and closes the opening is closed,
Of the core mold member consisting of a core body that molds the inner peripheral surface of the hollow seal portion of the mold molding part and a gripping part that protrudes from the core body when molding the mold molding part, both ends of the core body are The core mold member so that the connection width of the molded part in the longitudinal direction of the weather strip is 0.5 mm or more and 3.0 mm or less in a state where each is inserted into the end of the hollow seal part of the extruded part. Is set at a predetermined position of the mold apparatus, the mold member is closed, a cavity is formed in the mold apparatus, and a material for the mold forming part is filled in the cavity to form a mold forming part. With
In the mold forming part, at least the gripping part has a core extraction hole for extracting the core main body after forming in a range excluding the seal surface pressed against the mating member of the hollow seal part. The length along the circumferential direction of the inner circumferential surface of the seal portion is formed so as to be 25% or more and 45% or less of the circumferential length of the inner circumferential surface,
After forming the mold forming part and opening the mold member of the mold apparatus, the core body is removed from the core punching hole ,
Among the plurality of mold members, in a predetermined mold member facing the outer peripheral surface of the core main body, a locking protrusion is formed to latch the extrusion molding portion inserted into the core main body. A weatherstrip manufacturing method. The method for producing a weather strip according to claim 1, wherein an olefinic thermoplastic elastomer having an IRHD (international rubber hardness) of 40 degrees is used as a material of the mold part. During the molding, a predetermined mold member of the plurality of mold members is disposed so as to abut on the circumferential side of the hollow seal portion in the grip portion and abut against the core body. In addition, after the cavity is filled with a material, the predetermined mold member is relatively separated from the core mold member, so that a part of the core punching hole is formed. The method for producing a weather strip according to claim 1 or 2 .

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