JP5168305B2 - Weather strip manufacturing method - Google Patents

Description

The present invention relates to a manufacturing method of Uezasutori' flop for sealing between the movable roof for opening and closing the roof panel opening this roof panel opening of the body such as an automobile.

  2. Description of the Related Art Conventionally, a movable roof such as a sliding roof that opens and closes the roof panel opening is provided at a roof panel opening formed in a roof panel of a body of an automobile or the like, and a weather strip is provided at the periphery of the movable roof. Is installed.

  The weather strip includes an attachment base portion that is attached along the periphery of the movable roof, and a hollow seal portion that protrudes from a side surface of the attachment base portion and has a hollow portion. When the movable roof is closed, the hollow seal portion is brought into pressure contact with the peripheral edge portion of the roof panel opening so that the space between the roof panel and the movable roof is sealed.

  In general, this type of weather strip is formed in an annular shape by joining ends of one extruded portion formed in an elongated shape by extrusion. That is, with the end portions of the extrusion-molded portion being supported and fixed in the mold apparatus, the end portions are connected to each other by forming a mold-formed portion by injection molding between the end portions. A 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). In such a configuration, the width of the connecting portion can be reduced, but the hollow portion is blocked at the connecting portion, so that the load when the opening and closing member such as a movable roof is closed is locally near the connecting portion. May grow. 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 mounting base 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 of the above-mentioned Patent Document 3 has a relatively large width (connection width) of the mold forming portion in the longitudinal direction of the weather strip, and an opening formed therein is also provided. Since it has a relatively large opening area that is used not only as a core hole but also as an air hole, the appearance may be poor and there may be a decrease in 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.

  In the case where the hollow seal portion is on the side surface of the mounting base and a part of the hollow seal portion is constituted by the side wall of the mounting base, a part of the core body installed in the hollow seal portion described above is the mounting base. Since the mounting base portion is formed with a thickness that can maintain the shape of the core body, at the time of extracting the core body, it will depend only on the deformation of the seal wall side portion of the hollow seal portion, It becomes difficult to perform core removal work.

The present invention was made to solve the above problems, and an object, upon manufacturing a weather strip to be connected by the molded portion molded portion out press, appearance quality and sealing of the weather strip It is an object of the present invention to provide a method for producing a weather strip that allows a core mold to be drawn out in a relatively narrow width within the range of a molded part without causing a decrease in the above.

  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 a corresponding means are added as needed.

Means 1 . Extruded molded part (extruded general part) and a molded part molded by a mold device composed of a plurality of mold members so that the ends of the extruded molded part are connected linearly ( Mold forming connection part), and
A mounting base attached to the periphery of the movable roof for opening and closing the roof panel opening of the body;
A weather strip manufacturing method comprising: a hollow seal portion provided so as to protrude from the mounting base portion and having a seal wall pressed against the periphery of the roof panel opening when the movable roof is closed. And
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 portion, at least the gripping portion has a core punching hole for pulling out the core body after molding, and the sealing surface of the seal wall is pressed against the periphery of the roof panel opening portion of the hollow seal portion. In a range excluding, the length along the circumferential direction of the inner peripheral surface of the hollow seal portion is formed to be 15% or more and 45% or less of the peripheral length of the inner peripheral 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 15% and not more than 45% of the peripheral length of the inner peripheral surface. More preferably, it is formed to be 25% or more and 40% or less. Further, considering that 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 is 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 movable roof 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 movable roof and closing the core hole. The load difference applied at the time of closing the movable roof with the adjacent extruded portion does not increase.

As a result, according to this means, the weatherstrip sealability and appearance quality are not deteriorated. In this means, the length of the core punching hole with respect to the circumferential direction of the hollow seal portion is secured to some extent because the width of the core punching hole with respect to the longitudinal direction of the weather strip is set to a relatively narrow value of 3.0 mm at the maximum. There is a need. Depending on the length of the core body in the longitudinal direction of the weatherstrip, in order to perform the core removal operation of the core body that can form a hollow seal part having a width of 3.0 mm at the maximum, It is preferable that the length of the core extraction hole along the direction is at least 15% of the peripheral length of the inner peripheral surface (the outer peripheral surface of the core body) of the hollow seal portion. In the case where the core hole is provided in the seal wall, it is more preferably 25% or more. If the length of the core punching hole is less than 15% 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. In addition, when a core hole is provided in a seal wall, it is more preferable to set it as 40% or less.

Further , according to the 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 injection 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 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 1 , 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 , since the entire molded part is formed of a relatively soft TPV with IRHD of 40 degrees, the repulsion between the hollow seal part of the mold part and the hollow seal part (made of sponge rubber) of the extrusion part. The forces can be made equal, and a reduction in 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 for sandwiching the extrusion-molded portion, facilitate the core removal operation, improve productivity, and improve 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 weather strip manufacturing method according to claim 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 roof panel etc. of a motor vehicle. It is a front view of a weather strip. It is the JJ sectional view taken on the line of FIG. 2 which shows a weather strip. It is sectional drawing which shows the weather strip of the state attached to the sliding roof. It is a perspective view which shows the shaping | molding part of a weather strip. It is the KK sectional view taken on the line of FIG. 2 which shows a weather strip. It is a partially expanded sectional view which shows the hollow seal part etc. of a shaping | molding part. It is sectional drawing which shows the metal mold apparatus for a shaping | molding part shaping | molding part. It is sectional drawing of the metal mold | die apparatus which shows the state with which the material was filled in the cavity. It is sectional drawing which shows the various metal mold | die of the state by which the extrusion molding part was engage | inserted. It is sectional drawing which shows the shaping | molding part of the weather strip of another embodiment. It is sectional drawing which shows the metal mold apparatus for the shaping | molding part shaping | molding part of the weather strip of another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing an automobile roof panel and the like. FIG. 2 is a front view showing the weather strip. 3 is a cross-sectional view taken along line JJ of FIG. 2 showing a weather strip.

  As shown in FIG. 1, a roof panel 1 of a body of an automobile or the like is provided with a roof panel opening 2 and a sliding roof 3 as a movable roof that opens and closes the roof panel opening 2. . A sliding roof weather strip 5 (hereinafter simply referred to as “weather strip 5”) is provided on the periphery of the sliding roof 3.

  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. A trim portion 11 serving as a mounting base, and a hollow seal portion 15 that protrudes from the outer peripheral side wall portion 13 to the outside of the vehicle, has a hollow portion 15a, and has an arc-shaped seal wall 15b. ing.

  The outer peripheral side wall portion 13 is integrally formed with a holding projection 17 that protrudes toward the inner peripheral side of the weather strip (left side in FIG. 3) at the lower end thereof. Further, the extruded portion 6 is provided with an extending base 24 extending obliquely outward (weather strip outer peripheral side) from the lower end portion of the outer peripheral side wall portion 13, and further obliquely from the lower end of the extending base portion 24. A draining lip 25 extending outward is provided. The draining lip 25 may extend directly from the lower end of the extending base 24.

  Further, the outer peripheral side lip 18 is integrally formed on the inner peripheral side wall portion 12 so as to extend from the upper end portion thereof toward the weather strip inner peripheral side, and from the lower end portion thereof toward the inner peripheral side of the weather strip. An extended vehicle interior seal lip 19 is integrally formed.

  The vehicle interior seal lip 19 includes a vehicle body lip 19a on the vehicle interior side (lower side in FIG. 3) and an auxiliary lip 19b on the vehicle exterior side (upper side in FIG. 3), and has a hollow portion 19c between both lips 19a and 19b. Yes.

  The trim part 11 is made of EPDM (ethylene-propylene-diene copolymer) solid rubber, and the seal wall 15b of the hollow seal part 15 is made of EPDM sponge rubber. A coating layer 20 made of EPDM sponge rubber is formed on the outer surface of the vehicle outer side seal lip 18 so as to extend from the seal wall 15 b of the hollow seal portion 15.

  As shown in FIG. 4, the sliding roof 3 is composed of a flat glass panel 21 and a square frame 22 provided around the glass panel 21. Further, a flange portion 23 is formed on the periphery of the sliding roof 3 so that the end portion of the frame 22 is folded back to the vehicle outer side. The weather strip 5 is held on the periphery of the sliding roof 3 by fitting the trim portion 11 into the flange portion 23. In this state, the vehicle exterior seal lip 18 is pressed against the upper surface of the glass panel 21 and the vehicle interior seal lip 19 is pressed against the peripheral edge of the glass panel 21. Thereby, the space between the glass panel 21 and the frame 22 is sealed.

  When the sliding roof 3 is closed, the sealing surface of the seal wall 15b of the hollow seal portion 15 is pressed against the peripheral edge of the roof panel opening 2 to be crushed and deformed (see the two-dot chain line in FIG. 4). The space between the roof 3 and the roof panel 1 is sealed.

  Further, in the extruded portion 6, the end portion of the seal wall 15 b is joined at the boundary position between the draining lip 25 and the extended base portion 24. For this reason, the presence of the draining lip 25 causes rainwater or the like that has reached the surface of the seal wall 15b to fall into the drip groove of the roof panel 1 from the tip of the draining lip 25 to prevent rainwater or the like from entering the vehicle. 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, the molded part 7 is entirely composed of a dynamically crosslinked olefinic thermoplastic elastomer (TPV) having an IRHD (international rubber hardness) of 40 degrees, an auxiliary lip 19b and a coating layer 20 are provided. It is slightly different from the extruded part 6 in that it is not.

  Furthermore, in the mold forming part 7, as shown in FIGS. 5 to 8, a core mold member 58 (for forming the inner peripheral surface 15c (hollow part 15a) of the hollow seal part 15 of the mold forming part 7). A core punching hole 44 is formed in order to extract after the molding (see FIG. 8). The core hole 44 is provided in the seal wall 15b adjacent to the draining lip 25, and is provided so as not to form a portion where rainwater or the like accumulates in the hollow portion 15a. The details of the core mold member 58 will be described later. Hereinafter, the other mold members including the core mold member 58 are expressed by omitting the word “member”.

  The core punching hole 44 is a lower side of the seal wall 15b of the hollow seal portion 15 in a state where it is attached to the sliding roof 3 (vehicle) except for a range W2 which becomes a seal surface pressed against the periphery of the roof panel opening 2. It is formed in the part located inside.

  The core punching hole 44 is set in the entire area (2.0 mm width) of the mold forming portion 7 in the weather strip longitudinal direction, and the length W3 along the circumferential direction of the inner peripheral surface 15c of the hollow seal portion 15 is The inner circumferential surface 15c is set to be 30% of the circumferential length W0 (see FIG. 7). The inner peripheral surface 15 c of the hollow seal portion 15 is composed of an inner surface of the seal wall 15 b and an outer surface of the extending base portion 24.

  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). A core mold 58 is provided between the second movable mold 54 and the third movable mold 55. The first to fourth movable molds 53 to 56 are provided so as to be movable relative to the fixed mold 52 by a cylinder or the like (not shown). The first movable mold 53, the second movable mold 54, and the fourth movable mold 56 are moved with respect to the fixed mold 52, and then the third movable mold 55 and the core mold 58 are fixed together. The third movable mold 55 is moved away from the core mold 58, and finally the core mold 58 is removed from the molded product.

  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 56 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 15c (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 56. Is done. A cavity 61 (see FIG. 8) for molding the mold forming portion 7 is formed by the molding surface 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 not shown, the second movable mold 54 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 to predetermined length according to the circumferential length of the flange part 23 of the sliding roof 3 which it is going to mount | wear.

  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 respective molds 52 to 56 are opened from each other, the elongated extruded portion 6 is curved, and the hollow seal portion 15 of the core mold 58 is arranged so that both ends thereof face each other. The core body 59 is fitted into both ends in the longitudinal direction (vertical direction in FIG. 10), and the movable dies 53 to 56 and the core mold 58 are set at predetermined positions with respect to the fixed mold 52 and clamped. 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 third movable die 55 is in contact with the lower surface of the core body 59 and is also in contact with the lower surface of the grip portion 60 that is continuous with the lower surface. .

  In 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 core sealing hole 15 is formed in the hollow seal portion 15 of the mold forming portion 7 due to the presence of the gripping portion 60 and the third movable die 55 in contact therewith.

  After completion of the solidification of the TPV, the movable molds 53 to 56 are sequentially opened in reverse to the mold clamping, and the molded mold part 7 is released from the fixed mold 52 together with the core mold 58.

  At this stage, the core body 59 is exposed at a portion where the core body 59 and the third movable mold 55 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 sliding roof 3 is closed is locally increased in the vicinity of the connecting 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 formed without providing a support lip for closing the core hole 44 while supporting the hollow seal part 15 when the sliding roof 3 is closed. The load difference applied when the sliding roof 3 is closed with the adjacent extruded portion 6 does not increase. Further, there is no need to provide a support lip or the like that hinders the core removal operation. Furthermore, since the cored hole 44 is provided adjacent to the draining lip 25, rainwater or the like does not accumulate in the hollow portion 15a.

  The core punching hole 44 has a length W3 along the circumferential direction of the inner circumferential surface 15c of the hollow seal portion 15 corresponding to the inner circumferential surface 15c corresponding to the relatively narrow width of 2.0 mm in the weather strip longitudinal direction. Since it is set to be relatively long so as to be 30% of the circumferential length W0 of the surface 15c, 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 removed relatively easily without causing deterioration in sealing performance and 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 no fear.

  As a result, it is possible to shorten the range in which the extruded 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, the vulcanization step can be omitted by using TPV.

  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 third movable mold 55 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 sliding roof 3 as a movable roof. However, the embodiment is not limited thereto, and the roof panel opening such as a tilt type is used. You may embody in the weather strip with which the periphery of the other movable roof which can be opened and closed is mounted | worn.

  (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 15c of the hollow seal portion 15 is set to be 30% of the peripheral length W0 of the inner peripheral surface 15c. 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 15% of the peripheral length W0 of the inner peripheral surface 15c 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. There is a risk of problems such as this. On the other hand, when the length W3 of the core hole 44 exceeds 45% of the peripheral length W0 of the inner peripheral surface 15c of the hollow seal portion 15, it may be difficult to secure the seal surface and prevent water from entering. There is. Therefore, it is preferable that the length W3 of the core hole 44 is set to be 15% or more and 45% or less of the peripheral length W0 of the inner peripheral surface 15c of the hollow seal portion 15. Further, when the core hole 44 is provided in the seal wall 15b, it is more preferable to set the length W3 to 25% or more and 40% or less of the peripheral length W0 of the inner peripheral surface 15c.

  (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 punching 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 sliding roof 3. The position where the core hole 44 is formed is not limited to this. For example, as shown in FIG. 11, a core hole 46 may be formed in the extended base 24. In this way, the core hole 46 can be concealed from human eyes, and even if the core hole 46 is present in the mold part 7, it is possible to prevent deterioration of the sealing property and appearance quality of the weather strip 5. it can.

  An example of a mold apparatus used for forming the mold forming portion 7 as shown in FIG. 11 is a mold apparatus 151 as shown in FIG. The mold apparatus 151 includes a fixed mold 152 positioned on the lower side of the figure and a plurality of movable molds (first movable mold 153, second movable mold 154, third movable mold 155, and fourth movable mold. 156). A core mold 158 is provided between the fixed mold 152 and the third movable mold 155. The core mold 158 includes a core body 159 and a grip portion 160 that extends integrally from the core body 159.

  (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 molding part 6 from coming off, it is preferable to have an orthogonal surface orthogonal to the weather strip longitudinal direction as the opposing surface of the pair of locking projections as in the above embodiment. Moreover, it is good also as a structure which abbreviate | omitted the latching protrusion 53a.

  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 third movable mold 55 in contact therewith. However, the present invention is not limited to this, and the core punching hole 44 may be formed only by the grip portion 60 of the core mold 58.

  (H) In the above embodiment, the extension base 24 connects the lower end of the outer peripheral side wall 13 and the lower end of the seal wall 15b. However, when the cross section of the hollow portion 15a is small, the extension base 24 may be omitted, and the lower end of the outer peripheral side wall portion 13 and the lower end of the seal wall 15b may be directly connected, and the draining lip 25 may extend from the connection portion. In this case, the core hole 44 is provided in the seal wall 15b.

  (I) Although not specifically mentioned in the above embodiment, a pad may be inserted into the hollow portion 15a of the corner portion in order to prevent the hollow portion 15a from being crushed at the corner portion of the weather strip 5. Good.

DESCRIPTION OF SYMBOLS 1 ... Roof panel, 2 ... Roof panel opening part, 3 ... Sliding roof, 5 ... Weather strip, 6 ... Extrusion part, 7 ... Molding part, 11 ... Trim part, 12 ... Inner peripheral side wall part, 13 ... Outer peripheral side wall part, 14: connecting part, 15 ... hollow seal part, 15a ... hollow part, 15b ... seal wall, 15c ... inner peripheral surface, 24 ... extension base part, 25 ... draining lip, 44 ... core punching hole, 51 ... Die device, 52 ... Fixed mold, 53-56 ... Movable mold, 53a ... Locking projection, 58 ... Core mold, 59 ... Core body, 60 ... Holding part, 61 ... Cavity, W0 ... Hollow seal part Peripheral length of the peripheral surface, W1 ... connection width of the molding part, W2 ... range of the seal surface, W3 ... length of the core hole, W4 ... length of the insertion part, W5 ... thickness of the grip part.

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,
A mounting base attached to the periphery of the movable roof for opening and closing the roof panel opening of the body;
A weather strip manufacturing method comprising: a hollow seal portion provided so as to protrude from the mounting base portion and having a seal wall pressed against the periphery of the roof panel opening when the movable roof is closed. And
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 portion, at least the gripping portion has a core punching hole for pulling out the core body after molding, and the sealing surface of the seal wall is pressed against the periphery of the roof panel opening portion of the hollow seal portion. In a range excluding, the length along the circumferential direction of the inner peripheral surface of the hollow seal portion is formed to be 15% or more and 45% or less of the peripheral length of the inner peripheral 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 of 40 degrees is used as a material of the mold forming 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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