JP5397285B2 - Weather strip manufacturing method - Google Patents

Description

The present invention relates to a manufacturing method of Uezasutori' flop used in the periphery of the door opening of the body such as an automobile.

  Conventionally, a weather strip is attached to the periphery of a door 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 door opening, and a hollow seal portion having a hollow portion protruding from the side surface of the trim portion. And. And when the door which opens and closes the said door opening part is closed, a hollow seal part is press-contacted to the peripheral part of a door, and it seals between a body and a door.

  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). In such a configuration, the width of the connection portion can be reduced, but the hollow portion is blocked at the connection portion, so the load when closing the opening and closing member such as a door is locally increased in the vicinity of the connection portion. There is a risk. 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 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.

  When the hollow seal portion is on the side surface of the trim portion as in the present application, and the side wall of the trim portion constitutes a part of the hollow seal portion, one of the core main bodies installed in the hollow seal portion described above is used. Since the part forms the side wall of the trim part, and the trim part is formed with a thickness that can maintain its shape, only the deformation of the seal wall side part of the hollow seal part is relied upon when extracting the core body As a result, it becomes difficult to perform the core removal work.

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,
A trim attached to the periphery of the door opening of the body;
Manufacturing of a weather strip having a hollow seal portion provided so as to project from the vehicle outer side wall portion of the trim portion and pressed against the peripheral edge portion of the door when the door opening and closing is closed A method,
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 range where the core punching hole for pulling out the core body after molding at least by the gripping part, excluding the sealing surface pressed against the peripheral edge of the door of the hollow seal part, The length along the circumferential direction of the inner circumferential surface of the hollow seal portion is formed so as to be 25% or more and 45% or less of the circumferential length of the inner circumferential surface,
A method of manufacturing a weather strip, wherein the core body is removed from the core punching hole after the mold forming portion is formed and a mold member of the mold apparatus is opened.

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 door 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.

Further, according to the structure of the present means, the mold forming portion and the vicinity thereof can be provided without providing a support lip or the like as described in the background art above, which supports the hollow seal portion while closing the door while closing the door. The difference in load applied when the door is closed with the extrusion molding part is not increased.

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.

Means 2 . Among the plurality of mold members, in a predetermined mold member facing the outer peripheral surface of the core main body, a locking projection for engaging the extrusion molding portion inserted into the core main body is formed. A weatherstrip manufacturing method according to means 1 .

According to the above-mentioned means 2 , by providing the locking projection, it is possible to hold it sufficiently without sandwiching a relatively wide range in the longitudinal direction of the extruded part, and the injection pressure at the time of material injection into the cavity This can reduce the possibility that the extruded part is detached from the core body. 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 3 . 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 said means 3, the repulsive force of the hollow seal part of a shaping | molding part and the hollow seal part of an extrusion molding part can be made equivalent, and the fall of a sealing performance can be prevented. Also, the trim part of the molded part is lower in rigidity than the extruded part and the mounting stability seems to be worse, but the molded part is a short section with respect to the longitudinal direction of the weather strip. In addition, since the rigidity of the trim portions of the adjacent extrusion-molded portions assists, the mounting stability does not deteriorate even if the trim portions are made of 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.

Also, usually, when molding the molded part is adapted to insert the two ends of the core body to the end portion of the hollow seal portion of the respective extruded section, and set in a mold apparatus, into the cavity of the mold apparatus Supply material. 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 2 , the effect is great because the trace is hardly left.

Means 4 . 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. 4. A weatherstrip manufacturing method according to any one of means 1 to 3 .

According to the above means 4 , 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 of a car with a front door in an open state. 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 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 a front view which shows the weather strip of another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of an automobile with a front door in an open state. 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, an automobile 1 as a vehicle is provided with an automobile door (front door in the figure: hereinafter simply referred to as “door 2”) that can be opened and closed, and an automobile body 3 ( An opening trim weather strip 5 (hereinafter simply referred to as “weather strip 5”) is provided on the periphery of the door opening 4 of the vehicle body.

  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. 4).

  As shown in FIG. 3, the extrusion molding portion 6 includes a vehicle inner side wall portion 12, a vehicle outer 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 is provided, and a hollow seal portion 15 is provided so as to protrude outward from the vehicle outer side wall portion 13 and has a hollow portion 15a therein.

  A holding lip portion 16 extending toward the inside (vehicle outer side) of the trim portion 11 is integrally formed on the inner surface (vehicle outer surface) of the vehicle inner side wall portion 12, and the trim portion is formed on the inner surface (vehicle inner side surface) of the vehicle outer side wall portion 13. A plurality of holding lip portions 17 extending toward the inner side of the vehicle 11 (the vehicle inner side) are integrally formed.

  Furthermore, a design lip 18 is formed in the connecting portion 14 so as to cover an end portion of an interior product such as a garnish (not shown).

  The trim portion 11 is configured by a metal insert 19 embedded therein with a coating material of EPDM (ethylene-propylene-diene copolymer) solid rubber. On the other hand, the hollow seal portion 15 is made of EPDM sponge rubber.

  Moreover, the flange part 23 is formed in the periphery of the door opening part 4 by joining the inner panel 21 and the outer panel 22 of the motor vehicle body 3, and the trim part 11 is fitted by this flange part 23, A weather strip 5 is held on the periphery of the door opening 4.

  When the door 2 is closed, the hollow seal portion 15 is pressed against the peripheral edge of the door 2 to be crushed and deformed, thereby sealing between the door 2 and the automobile body 3.

  When the weather strip 5 is attached, it is outside the range from the substantially distal end portion of the design lip 18 to the base end portion, further the connecting portion 14 of the trim portion 11, and the connecting portion with the hollow seal portion 15 in the vehicle outer side wall portion 13. The surface becomes a design surface appearing in the appearance. For this reason, the decoration layer 26 which consists of a nonwoven fabric etc. is formed in this design surface.

  On the other hand, as shown in FIG. 4, the molding part 7 is formed so that the connection width W1 in the weather strip longitudinal direction (left-right direction in FIG. 4) is 2.0 mm. As shown in FIG. 5, 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 and a hollow seal portion 15. 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, the holding lip parts 16 and 17 and the insert 19. And the point which the decoration layer 26 is not provided, etc. differ from the extrusion molding part 6. FIG.

  Furthermore, in the mold forming part 7, as shown in FIGS. 4 to 6, 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 located on the lower side of the hollow seal portion 15 in a state where the hollow seal portion 15 is attached to the flange portion 23 in a range excluding the range W2 that becomes a seal surface in pressure contact with the 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. 7 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 second movable mold 54 and the third movable mold 55. 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. 9, 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. 9, the fifth movable mold 57 is used for retaining the extrusion molding portion 6 fitted in the insertion portion 59a at a position facing the outer peripheral surface of the insertion portion 59a of the core body 59. A pair of locking projections 57a is formed. The pair of locking projections 57a have a right triangle shape in cross section along the weather strip longitudinal direction (vertical direction in FIG. 9), and surfaces orthogonal to the molding surface of the fifth movable die 57 are opposed to each other. It is formed to do. Although not shown, the first movable mold 53 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 door opening part 4 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 in which the molds 52 to 57 are mutually opened, the elongated extruded portion 6 is curved in accordance with the shape of the door opening 4 and the hollow is formed so that both ends thereof face each other. The seal portion 15 is fitted into both ends of the core die 58 in the longitudinal direction (vertical direction in FIG. 9) of the core body 59, and the movable dies 53 to 57 and the core die 58 are set at predetermined positions with respect to the fixed die 52. Tighten. 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. 9, the extruded portion 6 fitted in 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 molded portion 7. At the same time, and the locking projection 57a of the fifth movable die 57 or the like prevents the core body 59 from falling off.

  In the clamped state, as shown in FIG. 7, the second movable die 54 abuts on the side surface of the core body 59 and also abuts on the upper surface of the grip portion 60 that is continuous with the side surface. .

  Then, from this state, as shown in FIG. 8, 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 hole 44 due to the presence of the grip portion 60 and the second movable die 54 in contact with the grip portion 60.

  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 second movable mold 54 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 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.

  Furthermore, since the opening area of the core punching hole 44 is relatively small, the molding part 7 and the vicinity thereof can be provided without providing a support lip or the like for closing the core punching hole 44 while supporting the hollow seal part 15 when the door 2 is closed. The difference in load applied when the door 2 is closed with the extruded portion 6 is not increased. 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.

  Further, the first movable mold 53 and the like are formed with a pair of locking projections 57a 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 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.

  Further, by using TPV, there is no trace left on the extrusion molding part 6 when the rubber material is vulcanized, and traces locked by the locking projections 57a are hardly left. 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 molding, 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 second movable mold 54 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 particular, in the weather strip 5 of the present embodiment, a part of the hollow seal portion 15 is constituted by a portion of the vehicle outer side wall portion 13 of the trim portion 11, and the trim portion side is not easily deformed when the core is removed. Since the core is removed by deformation only on the wall side and the core removal hole 44 is also formed by the second movable die 54, the opening can be made wider and the extraction 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 embodiment is embodied in the weather strip 5 mounted on the periphery of the door opening 4 corresponding to the front door 2, but not limited to this, it corresponds to other doors such as a rear door. You may embody in the weather strip with which a door opening part 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 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-described embodiment, the core hole 44 is formed in a portion of the hollow seal portion 15 that is positioned on the lower side when attached to the flange portion 23. The position where the core hole 44 is formed is not limited to this. For example, when the mounting of the molding part 7 is on the hinge side of the door, the length W3 of the core hole 44 is equal to that of the hollow seal part 15. In a case where the inner peripheral surface 15b is relatively short, such as 25% of the peripheral length, the hollow seal portion 15 is in a state where it is attached to the flange portion 23 in a range excluding the range W2 which becomes a seal surface that is in pressure contact with the door 2. It is good also as forming in the site | part (site | part by the side of the connection part 14 in the trim part 11) located in the inner peripheral side of a door opening part. 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 fifth movable mold 57 and the like are formed with a pair of locking projections 57a having a right-angled triangular cross-section that locks the extruded portion 6 fitted into the insertion portion 59a of the core body 59. . The configuration of the locking projection 57a 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. Further, the latching protrusion 57a may be omitted.

  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 the peripheral edge of the core punching hole 44 may be damaged, it is more preferable to provide it on the fifth movable mold 57 or the like 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 second movable mold 54 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) A scuff plate or the like may be attached to the lower edge of the door opening 4. In this way, since the trim part 11 of the molded part 7 is covered with the scuff plate, the appearance quality can be further improved.

  (I) The weather strip 5 according to the above embodiment has a configuration in which both end portions of one extrusion molding portion 6 are connected to each other by a molding portion 7 at one place. Further, in a state in which the weather strip 5 is attached to the door opening 4, the mold forming portion 7 is configured to be positioned substantially at the center of the lower edge portion of the door opening 4. The number and position of the mold forming parts 7 are not limited to the above embodiment.

  For example, as shown in FIG. 10, it is good also as a structure which connected the some extrusion molding part by the some mold formation part in several places. In the example shown in FIG. 10, it has the structure by which the two extrusion molding parts 6a and 6b were connected by two mold molding parts 7a and 7b. In such a configuration, in order to improve the appearance quality, it is preferable that all of the plurality of molded portions 7a and 7b are located within the range of the lower edge of the door opening 4 (the lower side of the weather strip 5). Furthermore, it is preferable that the trim portions are covered with a scuff plate 70 or the like.

  Further, regarding the extruded portion 6b on the lower side that is covered with the scuff plate 70 or the like, various configurations different from the above-described embodiment can be adopted in order to reduce the weight. For example, it is preferable to appropriately employ at least one of the following configurations (1) to (5). (1) The trim part 11 and the hollow seal part 15 are all formed of sponge rubber. (2) The insert 19 is omitted. (3) The decorative layer 26 is omitted. (4) The design lip 18 is omitted. 5) A part of the trim portion 11 (for example, the vehicle inner side wall portion 12 and the holding lip 16) is omitted, and the trim portion 11 is adhered to the flange portion 23 and the like with a double-sided adhesive tape or the like. In addition, the cross-sectional shape of the hollow seal part 15 of the extrusion molding part 6b of the said structure (1)-(5) and the cross-sectional shape of the hollow seal part 15 of the extrusion molding part 6a are the same, Comprising: 2 mm formed The outer shape of the cross section of the hollow seal portion of the connecting portion of the width is the same except for the core hole 44 portion.

DESCRIPTION OF SYMBOLS 1 ... Automobile, 2 ... Door, 3 ... Automobile body, 4 ... Door opening part, 5 ... Weather strip, 6 ... Extrusion part, 7 ... Molding part, 11 ... Trim part, 12 ... Car inner side wall part, 13 DESCRIPTION OF SYMBOLS ... Outer vehicle side wall part, 14 ... Connection part, 15 ... Hollow seal part, 15a ... Hollow part, 15b ... Inner peripheral surface, 44 ... Core hole, 51 ... Mold apparatus, 52 ... Fixed type, 53-57 ... Movable Mold 57a ... Locking projection 58 ... Core mold 59 ... Core body 60 ... Grasping part 61 ... Cavity W1 ... Connection width of molding part W2 ... Seal surface range W3 ... Core hole Length, W4: Length of the insertion part, W5: Thickness of the grip part.

Claims (4)

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 trim attached to the periphery of the door opening of the body;
Manufacturing of a weather strip having a hollow seal portion provided so as to project from the vehicle outer side wall portion of the trim portion and pressed against the peripheral edge portion of the door when the door opening and closing is closed A method,
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 range where the core punching hole for pulling out the core body after molding at least by the gripping part, excluding the sealing surface pressed against the peripheral edge of the door of the hollow seal part, The length along the circumferential direction of the inner circumferential surface of the hollow seal portion is formed so as to be 25% or more and 45% or less of the circumferential length of the inner circumferential surface,
A method of manufacturing a weather strip, wherein the core body is removed from the core punching hole after the mold forming portion is formed and a mold member of the mold apparatus is opened. Among the plurality of mold members, in a predetermined mold member facing the outer peripheral surface of the core main body, a locking projection for engaging the extrusion molding portion inserted into the core main body is formed. The method for producing a weather strip according to claim 1 . The method for producing a weather strip according to claim 1 or 2 , wherein an olefinic thermoplastic elastomer having an IRHD of 40 degrees is used as a material of the molding 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 of manufacturing a weather strip according to any one of claims 1 to 3 .

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