Weather strip mold and weather strip manufacturing method

Abstract

To provide a mold for a weather strip capable of opening an intermediate mold with a small number of working steps while avoiding contact between an intermediate plate and an intermediate core.SOLUTION: A mold 11 according to the present invention comprises an upper mold 20, a lower mold 30, and an intermediate mold 40. The intermediate mold 40 has an intermediate core 41, a first intermediate plate 42, and a second intermediate plate 43. The intermediate core 41 has an inner surface side molding surface 41a. The first intermediate plate 42 and the second intermediate plate 43 have outer surface side molding surfaces 42a and 43a, respectively. Then, the intermediate core 41 is superposed on at least a part of an upper side of the first intermediate plate 42, and the inner surface side molding surface 41a of the intermediate core 41 and the outer surface side molding surface 42a of the first intermediate plate 42, and the outer surface side molding surface 43a of the second intermediate plate 43 are faced to each other via a gap. This causes to form a molding cavity C1. In linkage with the first intermediate plate 42 moving in a first direction F1, the second intermediate plate 43 moves in a second direction F2 and the intermediate core 41 moves in a third direction away from the first intermediate plate 42.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a molding die for a weather strip formed by molding an injection molded portion at the end of a long extrusion molded body, and a manufacturing method for the weather strip. [Background technology]

[0002] Generally, a molding die for molding a weather strip having an undercut shape is composed of an upper die, a lower die, and a middle die (that is, composed of a plurality of parts such as a middle plate and a middle core) (see, for example, Patent Document 1). In the conventional technology described in Patent Document 1, when the middle plate is raised up against the lower die, the middle plate is manually slid backward in advance by a predetermined length in order to prevent the lower end of the molding surface of the middle plate from contacting the middle core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP-A-5-69445 (paragraph

[0009] , Figures 1 to 3, etc.) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology described in Patent Document 1, the operation of sliding the middle plate backward is essential before the operation of raising the middle plate, which poses a problem of requiring a large number of work steps.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a molding mold for weather strips and a manufacturing method for weather strips that can open the center mold with minimal labor while avoiding contact between the center plate and the center core. [Means for solving the problem]

[0006] In order to solve the above problems, the invention described in Means 1 is a molding die for molding a weather strip, which is formed by molding an injection molded portion at at least one end of a long extrusion molded body, and in which a hollow portion is provided in the injection molded portion, the molding die comprising an upper die, a lower die and a middle die, the middle die having a core, a first middle plate and a second middle plate, an end of the core has an inner surface side molding surface which forms the inner surface of the hollow portion, and an end of the first middle plate and an end of the second middle plate each have an outer surface side molding surface which forms the outer surface of the hollow portion, and when the extrusion molded body is set between the outer surface side molding surfaces and the molding die is closed, the core is arranged overlapping at least a part of the upper side of the first middle plate. The gist of the invention is a molding die for weather strips, characterized in that the inner molding surface of the core and the outer molding surface of the first mid plate face each other through a gap, thereby forming a molding cavity for the injection molded portion, the first mid plate is movable in a first direction away from the molding cavity, the second mid plate is movable in a second direction away from the molding cavity, and the core is movable in a third direction away from the first mid plate, and in conjunction with the movement of the first mid plate in the first direction, the second mid plate moves in the second direction and the core moves in the third direction.

[0007] Therefore, according to the invention described in Means 1, the second center plate and the core move in different directions in conjunction with the first center plate, so that the inner die of the molding die can be opened by a single manual operation of moving the first center plate. Also, the respective ends (inner molding surface and outer molding surface) of the core and the first center plate face each other, and the end (outer molding surface) of the second center plate faces each other, and when the inner die is opened, the second center plate moves in a second direction away from the molding cavity. Therefore, even if the core moves in a third direction away from the first center plate, contact between the core and the second center plate can be prevented.

[0008] Here, examples of materials for forming the weather strip include thermoplastic elastomers, thermoplastic resins, rubbers, etc. As the thermoplastic elastomers, olefin-based thermoplastic elastomers (TPO), styrene-based elastomers (TPS), etc. are preferably used. As the thermoplastic resins, polyvinyl chloride resins (PVC resins), polypropylene resins (PP resins), etc. are preferably used. Furthermore, as the rubbers, ethylene propylene diene rubbers (EPDM), etc. are preferably used.

[0009] The invention described in Means 2 is characterized in that in Means 1, the mold has a circular gear that transmits power to move the first center plate, the second center plate, and the center core, respectively, and a lever that rotates the gear.

[0010] Therefore, according to the invention described in Means 2, the first middle plate, the second middle plate and the center core can be easily moved by manually operating the lever to rotate the gear.

[0011] The invention described in Means 3 is characterized in that, in Means 2, a locking portion is protruded from the side of the gear, the locking portion is positioned eccentrically from the center of the gear, the molding die is connected to the first intermediate plate and includes a pull-in plate having an engaging portion with which the locking portion engages, and with the locking portion engaged with the engaging portion, the locking portion rotates together with the rotation of the gear, thereby moving the pull-in plate in a direction away from the molding cavity.

[0012] Therefore, according to the invention described in Means 3, by rotating the gear, the locking part rotates and locks with the locked part, moving the pull-in plate. This makes it possible to easily move the first intermediate plate to which the pull-in plate is connected.

[0013] The invention described in Means 4 is characterized in that, in Means 3, when the movement of the pull-in plate is less than a predetermined distance, the locking portion rotates while remaining locked to the locked portion, and when the movement of the pull-in plate is equal to or greater than a predetermined distance, the locking portion and the locked portion are released from each other.

[0014] Therefore, according to the invention described in means 4, when the locking portion and the locked portion are released from locking, the pull-in plate does not move, so that it is possible to prevent the first intermediate plate from moving more than necessary.

[0015] The invention described in Means 5 is based on any one of Means 2 to 4, and is characterized in that the mold is provided with a slide plate connected to the second intermediate plate and having a rack gear that meshes with the gear, and when the gear and the rack gear are meshed with each other, the gear rotates, causing the slide plate to move in a direction away from the molding cavity.

[0016] Therefore, according to the invention described in Means 5, the slide plate is moved by rotating the gear while the gear and the rack gear are meshed with each other. Therefore, the second intermediate plate to which the slide plate is connected can be moved in the second direction away from the molding cavity (first intermediate plate).

[0017] The invention described in Means 6 is characterized in that, in Means 5, the core has a rotation axis at the end opposite the inner molding surface and is rotatable around the rotation axis in a third direction away from the first center plate, a protrusion is formed on the core and is rotatable around the rotation axis, and the slide plate is provided with a pressing portion that presses the protrusion to rotate the core.

[0018] Therefore, according to the invention described in the sixth aspect, by moving the slide plate, the pressing portion presses the protruding piece, thereby rotating the core.

[0019] The invention described in Means 7 is characterized in that, in Means 6, a third mid plate is placed on top of the core, the end of the third mid plate has an outer surface molded surface that forms at least a part of the outer surface of the hollow portion, and the third mid plate is movable in the same manner as the core moves.

[0020] Therefore, according to the invention described in means 7, since the third intermediate plate forms at least a part of the outer surface of the hollow portion, the mold can be opened even if the injection molded portion has an undercut shape.

[0021] The invention described in Means 8 is a method for manufacturing a weather strip using the molding die described in any one of Means 1 to 4, and includes an extrusion molding setting step of setting the extrusion molding in the molding die with the upper die open; a molding cavity forming step of forming the molding cavity among the inner molding surface of the core, the outer molding surface of the first mid plate, the outer molding surface of the second mid plate, and an end of the extrusion molding with the upper die closed; an injection molded portion forming step of injecting a material for forming the injection molded portion into the molding cavity and forming the injection molded portion at the end of the extrusion molding; and a center die opening step of opening the upper die and moving the second mid plate in a second direction away from the molding cavity in conjunction with the first mid plate moving in a first direction away from the molding cavity and moving the core in a third direction away from the first mid plate, thereby opening the center die.

[0022] Therefore, according to the invention described in means 8, after the weather strip is formed, the inner mold of the forming mold can be opened with a single manual operation, thereby increasing productivity.

[0023] The invention described in Means 9 is characterized in that in the inner mold opening step of Means 8, the inner mold is opened with the injection molded portion of the weather strip fitted into the end of the core.

[0024] Therefore, according to the invention described in Means 9, when the inner mold is opened, the weather strip is fitted to the end of the core, so that the worker can easily remove the weather strip compared to when the weather strip remains in the molding cavity. Effect of the Invention

[0025] As described above in detail, according to the invention as set forth in claims 1 to 9, the inner mold can be opened with a small number of work steps while avoiding contact between the inner plate and the core. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a front view showing the weather strip of the embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a side view of the mold as viewed from the arrow A in FIG. 2. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 2. [Diagram 5] FIG. 4 is an enlarged cross-sectional view showing the vicinity of a molding cavity of a mold. [Figure 6] Cross-sectional view taken along line VI-VI in Figure 2. [Figure 7] FIG. [Figure 8] A side view showing the relationship between the center core, the third center plate, and the shaft. [Figure 9] FIG. 4 is a perspective view showing the relationship between the center core, the third center plate, and the shaft. [Figure 10] FIG. [Figure 11] Cross-sectional view taken along line XI-XI in Figure 10. [Figure 12] Cross-sectional view of line XII-XII in Figure 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the drawings.

[0028] The weather strip 1 of this embodiment is attached to a vehicle door that opens and closes an opening in a vehicle body, and has a function of improving the sealing property of the vehicle door. As shown in FIG. 1, the weather strip 1 is formed by molding an injection molded portion 4 between the ends 2a, 3a of long extrusion molded bodies 2, 3, and has a structure in which a hollow portion 5 is provided in the injection molded portion 4. In addition, a fin portion 6 is extended from an outer surface 5a of the hollow portion 5 and an outer surface of the extrusion molded body 3. The weather strip 1 of this embodiment is formed using ethylene propylene diene rubber (EPDM) or olefin-based thermoplastic elastomer (TPO) or the like. However, it is preferable that the extrusion molded bodies 2, 3 and the injection molded portion 4 are formed using the same material in order to easily bond them to each other.

[0029] Next, the molding die 11 for molding the weather strip 1 will be described.

[0030] As shown in Figs. 2 to 6, the molding die 11 includes an upper die 20, a lower die 30, and a middle die 40. The lower die 30, which is a fixed die, is attached to a mounting plate 12 of the molding die 11. An outer molding surface 32 that forms the outer surface 6a (see Fig. 1) of the fin portion 6 is provided at a predetermined position on the upper surface 31 of the lower die 30. Meanwhile, the upper die 20, which is a movable die, is disposed above the lower die 30. An outer molding surface 22 that forms the outer surface 5a of the hollow portion 5 is provided at a predetermined position on the lower surface 21 of the upper die 20. It should be noted that, by driving the upper die 20 downward and upward as shown in Figs. 3 to 6, the upper die 20 and the lower die 30 can be moved toward and away from each other.

[0031] The movable center die 40 has a core 41, a first center plate 42, a second center plate 43, and a third center plate 44. As shown in Fig. 5, an end 45 of the core 41 has an inner molding surface 41a that forms the inner surface of the hollow portion 5. An end 46 of the first center plate 42 has an outer molding surface 42a that forms the outer surface 5a of the hollow portion 5 and the outer surface 6a of the fin portion 6, and an end 47 of the second center plate 43 has an outer molding surface 43a that forms the outer surface 5a of the hollow portion 5 and the outer surface 6a of the fin portion 6. An end 48 of the third center plate 44 has an outer molding surface 44a that forms a part of the outer surface 5a of the hollow portion 5.

[0032] In addition, in a state where the extrusion molded bodies 2, 3 are set between the outer molding surfaces 42a, 43a and the molding die 11 is closed (see FIG. 2), the core 41 is placed overlapping the center part on the upper side of the first middle plate 42 (see FIG. 3), and the third middle plate 44 is placed overlapping on both sides of the upper side of the core 41 and the upper side of the first middle plate 42 (see FIG. 3). Then, the outer molding surface 22 of the upper die 20 and the outer molding surface 32 of the lower die 30 face each other with a gap therebetween, and the inner molding surface 41a of the core 41 and the outer molding surface 42a of the first middle plate 42 face each other with a gap therebetween, thereby forming a molding cavity C1 for the injection molded portion 4 and the fin portion 6 (see FIG. 5).

[0033] The first intermediate plate 42 is movable in a first direction F1 (toward the front in Figs. 2 and 4) away from the molding cavity C1, and the second intermediate plate 43 is movable in a second direction F2 (toward the rear in Figs. 2 and 4) away from the molding cavity C1. More specifically, the first intermediate plate 42 and the second intermediate plate 43 are movable in a direction approaching or moving away from the molding cavity C1 with their respective outer molding surfaces 42a, 43a facing each other.

[0034] As shown in Figs. 6, 8 and 9, the core 41 has a pair of end portions 51 located on the opposite side to the inner molding surface 41a (end portion 45) and has a rotation shaft 52. The core 41 is rotatable about the rotation shaft 52 in a third direction F3 (counterclockwise direction in Figs. 8, 11 and 12) in which the core 41 moves away from the first middle plate 42. In this embodiment, in conjunction with the movement of the first middle plate 42 in the first direction F1, the second middle plate 43 moves in the second direction F2 and the core 41 rotates in the third direction F3. In addition, a protrusion 53 is formed on each end portion 51 of the core 41. Each protrusion 53 is rotatable about the rotation shaft 52.

[0035] The third middle plate 44 has a rotation axis 52 at an end 54 located opposite to the outer molding surface 44a (end 48). That is, the rotation axis 52 of the third middle plate 44 is a common rotation axis with the rotation axis 52 of the core 41. The third middle plate 44 is rotatable in the same manner as the core 41. Specifically, the third middle plate 44 is rotatable about the rotation axis 52 in a third direction F3 in which the third middle plate 44 rotates around the rotation axis 52 and moves away from the first middle plate 42 and away from the core 41. In this embodiment, the third middle plate 44 rotates in conjunction with the rotation of the core 41 in the third direction F3, and when it rotates 90°, it rotates in the third direction F3 in which it moves away from the core 41 under its own weight.

[0036] As shown in Figs. 2 to 4 and 7, the forming die 11 has a pair of gears 61 and a pair of levers 62. Each gear 61 has a generally circular shape in a plan view, and rotates around a rotation shaft 63 protruding from the mounting plate 12. Each gear 61 is for transmitting power for moving the first middle plate 42, the second middle plate 43, the third middle plate 44, and the center core 41. A cylindrical pin 64 (locking portion) protrudes from a side surface 61a (upper surface) of each gear 61. The pin 64 is disposed eccentrically from the center O1 (rotation shaft 63) of the gear 61. Furthermore, each lever 62 has a base end connected to the outer periphery of the gear 61, and has a grip 62a at its tip. Each lever 62 has a function of rotating the gear 61 by being manually operated.

[0037] The mold 11 also includes a pair of strip-shaped pull-in plates 65. The base ends (the rear ends in Figs. 2 and 4) of both pull-in plates 65 are connected to the front side surface 42b of the first intermediate plate 42 by bolts (not shown). As shown in Fig. 2, the right pull-in plate 65 is disposed on the right side of the rotation shaft 63 of the right gear 61, and the left pull-in plate 65 is disposed on the left side of the rotation shaft 63 of the left gear 61. Furthermore, the tip ends (the front ends in Figs. 2 and 4) of both pull-in plates 65 are provided with a locking recess 66 (locking portion) to which the pin 64 of the gear 61 is locked. As shown in Fig. 2, the right locking recess 66 opens at the left side of the right pull-in plate 65, and the left locking recess 66 opens at the right side of the left pull-in plate 65. Furthermore, on both pull-in plates 65, at a position on the tip side of the locked recess 66 (the near side in Figs. 2 and 4), an extension portion 67 extending in the same direction as the locked recess 66 opens is formed.

[0038] With the pin 64 engaged in the engaged recess 66, the pin 64 rotates together with the gear 61, causing the pull-in plate 65 to move in a direction away from the molding cavity C1 (the direction of the arrow A1 shown in FIG. 7). When the movement of the pull-in plate 65 is less than a predetermined distance (10 mm in this embodiment), the pin 64 rotates while being engaged in the engaged recess 66. When the movement of the pull-in plate 65 reaches or exceeds the predetermined distance, the pin 64 is released from the engagement of the engaged recess 66 (see FIG. 10).

[0039] As shown in Figs. 2 to 4, 6 and 7, the forming die 11 includes one slide plate 71 in the shape of a strip. The slide plate 71 is disposed in a groove 13 provided in the mounting plate 12, and is movable to the front side and the back side. The slide plate 71 is disposed between a pair of gears 61 and a pair of pull-in plates 65. A pair of rod-shaped parts 72 protrude from an upper surface 71a of a tip part (the end part on the back side in Figs. 2, 4 and 6) of the slide plate 71. A pair of through holes 74 are provided in the protruding part 73 protruding from the back side surface 43b of the second intermediate plate 43. The rod-shaped parts 72 are inserted into the pair of through holes 74, respectively, so that the slide plate 71 is connected to the back side surface 43b of the second intermediate plate 43.

[0040] A thick portion 75 is formed at the base end of the slide plate 71 (the end on the front side of the first intermediate plate 42 in Figs. 2 and 6). A rack gear 76 that meshes with the gear 61 is provided on each side of the thick portion 75. When the gear 61 rotates with the gear 61 meshed with the rack gear 76, the slide plate 71 moves to the rear side (in the direction of arrow A2 shown in Fig. 7).

[0041] Furthermore, a protrusion 77 that protrudes upward is provided on the tip side of the thick portion 75 (the rear side in Figs. 2, 6, and 7), and a shaft 78 (pressing portion) that penetrates the protrusion 77 and protrudes on both sides (the left and right sides in Fig. 2) is provided on the protrusion 77. The shaft 78 presses the pair of protrusion pieces 53 of the core 41 to rotate the core 41.

[0042] Next, a method for producing the weather strip 1 using the above-mentioned molding die 11 will be described.

[0043] First, in the extrusion molding setting step, the upper die 20 is opened, and the core 41 is placed on the top of the first middle plate 42, and the third middle plate 44 is placed on the top of the core 41, so that the first middle plate 42 is positioned slightly (about 2 mm) closer to the front than when the molding die 11 is closed, and the second middle plate 43 is positioned slightly (about 2 mm) further back. Then, the worker sets the extrusion moldings 2, 3 between the outer molding surface 42a of the first middle plate 42 and the outer molding surface 43a of the second middle plate 43 (see FIG. 2).

[0044] In the subsequent molding cavity forming process, the force of closing the upper die 20 is used to move the first middle plate 42 to the rear and the second middle plate 43 to the front. Then, the upper die 20 is placed on top of the second middle plate 43 and the third middle plate 44. As a result, a molding cavity C1 (see FIGS. 4 and 5) is formed between the inner molding surface 41a of the core 41 and the outer molding surface 42a of the first middle plate 42, the outer molding surface 43a of the second middle plate 43, and the ends 2a, 3a of the extrusion molded bodies 2, 3.

[0045] In the subsequent injection molded part forming process, a molten material (EPDM, TPO, etc.) for the injection molded part 4 is injected into the molding cavity C1 through a gate (not shown) provided on either the upper mold 20 or the lower mold 30, filling the molding cavity C1 with the material for the injection molded part 4. Then, the injection molded part 4 is formed and joined to the extrusion molded bodies 2 and 3. As a result, a weather strip 1 is formed in which the injection molded part 4 is disposed between the terminal 2a of the extrusion molded body 2 and the terminal 3a of the extrusion molded body 3.

[0046] In the subsequent intermediate mold opening process, the upper mold 20 is moved upward to open the upper mold 20 (see Figs. 11 and 12), and then the pair of levers 62 are manually operated toward the front side (see Figs. 7 and 10). At this time, the right lever 62 is rotated in a clockwise direction F4 (see Fig. 2), and the left lever 62 is rotated in a counterclockwise direction F5 (see Fig. 2). As a result, both levers 62 approach each other. In addition, the gear 61 rotates by the same angle with the rotation of the lever 62. Furthermore, the pin 64 rotates with the rotation of the gear 61, and the pin 64 presses the engagement recess 66 of the pull-in plate 65, moving the pull-in plate 65 toward the front side (in the direction of the arrow A1 shown in Fig. 7). Accordingly, the first intermediate plate 42 to which the pull-in plate 65 is fastened also moves toward the front side (in the first direction F1 shown in Figs. 10 to 12).

[0047] Furthermore, when the gear 61 rotates, the rack gear 76 that meshes with the gear 61 and the slide plate 71 on which the rack gear 76 is provided move toward the rear (the direction of the arrow A2 shown in FIG. 7). Accordingly, the rod-shaped portion 72 protruding from the upper surface 71a of the slide plate 71 pulls the protruding portion 73 protruding from the rear side surface 43b of the second intermediate plate 43 toward the rear, so that the second intermediate plate 43 also moves toward the rear (the second direction F2 shown in FIGS. 4, 10 to 12). As a result, the second intermediate plate 43 moves in the second direction F2 in conjunction with the movement of the first intermediate plate 42 in the first direction F1.

[0048] Furthermore, as the slide plate 71 moves to the rear side, the protrusion 77 and the shaft 78 provided on the slide plate 71 also move to the rear side. As a result, the shaft 78 presses the side surface of the protrusion 53 of the core 41 in the rear direction, causing the protrusion 53 to rotate in the third direction F3 (see Figs. 8 and 9). The shaft 78 starts pressing the protrusion 53 after the slide plate 71 moves a predetermined distance to the rear side (i.e., the second middle plate 43 moves in the second direction F2). Then, as the protrusion 53 is pressed, the core 41 rotates around the rotation shaft 52, and the third middle plate 44 is pressed by the core 41 to rotate around the same rotation shaft 52. After rotating 90°, the third middle plate 44 rotates in the third direction F3 under its own weight and moves away from the core 41 (see Figs. 8 and 12). As a result, in conjunction with the movement of the first middle plate 42 in the first direction F1, the core 41 rotates in a third direction F3 (see Figs. 11 and 12) away from the first middle plate 42, and the third middle plate 44 rotates in a direction away from the core 41 and the first middle plate 42. Furthermore, when the engagement between the pin 64 of the gear 61 and the locked recess 66 of the pull-in plate 65 is released, the first middle plate 42 stops, but the second middle plate 43 continues to move and the core 41 and the third middle plate 44 continue to rotate. Then, when the end surface 51a of the core 41 and the end surface 54a of the third middle plate 44 come into contact with the upper surface of the thick portion 75 of the slide plate 71, the core 41 and the third middle plate 44 stop with different rotation angles, and the middle die 40 is in an open state. In the inner mold opening step, the inner mold 40 is opened with the injection molded portion 4 (hollow portion 5) of the weather strip 1 fitted into the end portion 45 of the core 41. Thereafter, the weather strip 1 is removed from the end portion 45, completing the series of manufacturing steps.

[0049] Therefore, according to this embodiment, the following effects can be obtained.

[0050] (1) In the molding die 11 for the weatherstrip 1 of this embodiment, the center core 41, the second intermediate plate 43, and the third intermediate plate 44 each move in conjunction with the first intermediate plate 42, so that the middle die 40 of the molding die 11 can be opened by simply performing a single manual operation of the lever 62 that moves the first intermediate plate 42. Moreover, the middle die 40 can also be closed by simply performing a single manual operation of returning the lever 62 to its original position. This improves the productivity of the weatherstrip 1.

[0051] Furthermore, the ends 45, 46 of the core 41 and the first intermediate plate 42 face the end 47 of the second intermediate plate 43, and when the intermediate mold 40 is opened, the second intermediate plate 43 moves in the second direction F2 away from the molding cavity C1. This prevents the core 41 from coming into contact with the second intermediate plate 43 even if the core 41 moves in the third direction F3 away from the first intermediate plate 42, thereby preventing the weather strip 1 fitted in the core 41 from being damaged.

[0052] (2) In this embodiment, when the middle mold 40 is opened, the weather strip 1 is fitted to the end 45 of the core 41. Moreover, the core 41 rotates about the rotation axis 52 in the third direction F3 away from the first middle plate 42, and when the middle mold 40 is opened, the end 45 reaches the upper part (see Figs. 11 and 12). Furthermore, since the third middle plate 44 rotates about the rotation axis 52 in the direction away from the core 41 and the first middle plate 42, the third middle plate 44 can be separated from the end 45 of the core 41. Therefore, the worker can easily remove the weather strip 1 compared to when the weather strip 1 remains in the molding cavity C1.

[0053] (3) In this embodiment, the center core 41, the first middle plate 42, the second middle plate 43, and the third middle plate 44 are moved using a pair of levers 62. Therefore, the force applied to each lever 62 can be made smaller than when only one lever 62 is used, and the force can be applied evenly from both sides of the molding die 11, so that the center core 41 and all of the middle plates 42 to 44 can be easily moved. In addition, the length of each lever 62 is sufficiently long compared to the radius of the gear 61. Moreover, a grip 62a is provided at the tip of each lever 62. This makes it easy to hold the grip 62a, and the lever 62 can be easily operated by applying force to it.

[0054] (4) In this embodiment, the shaft 78 of the slide plate 71 starts pressing the protruding piece 53 of the core 41 after the slide plate 71 (and the second middle plate 43) have moved a predetermined distance since starting to move toward the rear side. That is, when the operator starts to manually operate the pair of levers 62, only the first middle plate 42 and the second middle plate 43 move, and then the core 41 and the third middle plate 44 begin to rotate. As a result, when the core 41 and the third middle plate 44 rotate, the molded weather strip 1 can be prevented from coming into contact with the first middle plate 42 or the second middle plate 43 and being damaged.

[0055] The above embodiment may be modified as follows.

[0056] In the above embodiment, the first intermediate plate 42 moves linearly in the first direction F1 (near side) and the second intermediate plate 43 moves linearly in the second direction F2 (rear side) which is coaxial with and opposite to the first direction F1 (near side), so that the first intermediate plate 42 and the second intermediate plate 43 are separated from each other. However, the first direction F1 and the second direction F2 may be directions different from the near side and the rear side, and the first intermediate plate 42 and the second intermediate plate 43 may be separated from each other by moving linearly in directions different from the near side and the rear side. Also, the first intermediate plate 42 and the second intermediate plate 43 may be separated from each other by rotation, etc.

[0057] The core 41 in the above embodiment was rotatable around the rotation shaft 52 in the third direction F3 (counterclockwise) away from the first middle plate 42. However, the third direction F3 may be a direction other than counterclockwise, and the core 41 may be rotatable in a direction other than counterclockwise, or may be linearly movable in an upward direction away from the first middle plate 42. Similarly, the third middle plate 44 was rotatable around the rotation shaft 52 in the third direction F3 (counterclockwise) away from the first middle plate 42, but the third direction F3 may be a direction other than counterclockwise, and the third middle plate 44 may be rotatable in a direction other than counterclockwise, or may be linearly movable in an upward direction away from the first middle plate 42.

[0058] The molding die 11 in the above embodiment includes a pair of gears 61, a pair of levers 62, and a pair of pull-in plates 65, but may include only one each of the gears 61, levers 62, and pull-in plates 65. If there is a pair of levers 62, it is possible to easily apply force to the levers 62 since it is sufficient to move each lever 62 in the same direction (toward the user).

[0059] In the above embodiment, the gear 61 is rotated by manually operating the lever 62, but this does not have to be manual. For example, the lever 62 may be omitted, and the gear 61 may be rotated by an actuator such as a motor.

[0060] In the above embodiment, the pin 64 (locking portion) protrudes from the side surface 61a (upper surface) of the gear 61, and the pull-in plate 65 is provided with an engaged recess 66 (locking portion) with which the pin 64 locks. However, a pin may protrude from the side surface (lower surface) of the pull-in plate 65, and the side surface 61a of the gear 61 may be provided with an engaged recess with which the pin locks. Also, a protrusion other than the pin 64 may be used as the locking portion, or a recess other than the engaged recess 66 may be used as the engaged portion.

[0061] In the above embodiment, the injection molded portion 4 is disposed between the terminals 2a, 3a of the two extrusion molded bodies 2, 3. However, a single extrusion molded body may be formed into a ring shape, and the injection molded portion 4 may be disposed between both terminals of the extrusion molded body.

[0062] Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-mentioned embodiments will be listed below.

[0063] (1) A molding die for weather strips, as set forth in claim 1, characterized in that a third mid plate is arranged on top of the core, an end of the third mid plate has an outer molding surface that forms at least a part of the outer surface of the hollow portion, and the third mid plate is rotatable in a third direction that is the same as the rotation of the core. (2) In claim 1, the molding die for weather strips is characterized in that the core has a rotation axis at the end opposite the inner molding surface and is rotatable around the rotation axis in a third direction away from the first center plate. (3) The molding die for a weather strip according to claim 1, wherein the weather strip is formed by molding the injection molded portion between the respective ends of two of the extrusion molded bodies. [Explanation of symbols]

[0064] 1…Weather strip 2, 3...Extrusion molded body 2a, 3a...End of extrusion 4...Injection molding section 5...Hollow part 5a…Outer surface of hollow part 11…Mold 20…Upper mold 30…Lower mold 40…Medium size 41…Central core 41a…Inner molding surface 42…First middle plate 42a, 43a...Outer side molding surface 43…Second middle plate 44…Third center plate 45…End of core 46...End of first intermediate plate 47...End of second middle plate 48…End of third middle plate 51...End portion opposite to the inner molding surface of the core 52...Rotation axis 53...projection piece 61…Gear 61a…Side of gear 62…Lever 64...Pin as a locking part 65…Retractable plate 66...Engaged recess as the engaged portion 71...Slide plate 76…Rack gear 78...Shaft as pressing part C1…Molding cavity F1…First direction F2…Second direction F3…Third direction O1…the heart of the gear

Claims

1. A molding die for molding a weather strip, the weather strip being formed by molding an injection molded portion at at least one end of a long extrusion molded body, the injection molded portion having a hollow portion therein, The molding die includes an upper die, a lower die, and a middle die, The center mold has a center core, a first center plate, and a second center plate, an end portion of the core has an inner molding surface that forms an inner surface of the hollow portion; An end portion of the first intermediate plate and an end portion of the second intermediate plate each have an outer molding surface that forms an outer surface of the hollow portion, When the extrusion molded body is set between the outer molding surfaces and the mold is closed, the core is placed on at least a part of the upper side of the first mid plate, and the inner molding surface of the core and the outer molding surface of the first mid plate face each other via a gap with the outer molding surface of the second mid plate, thereby forming a molding cavity for the injection molded portion; the first mid-plate is movable in a first direction away from the mold cavity; the second mid-plate is movable in a second direction away from the mold cavity; The center core is movable in a third direction away from the first center plate; In conjunction with the movement of the first intermediate plate in the first direction, the second intermediate plate moves in the second direction and the core moves in the third direction. A molding die for a weather strip, comprising:

2. The mold is a circular gear that transmits power for moving each of the first center plate, the second center plate, and the center core; A lever for rotating the gear; 2. The molding die for a weather strip according to claim 1, further comprising:

3. A locking portion is protruding from a side surface of the gear, and the locking portion is disposed eccentrically from the center of the gear, the molding die includes a pull-in plate connected to the first intermediate plate and having an engaged portion to which the engaging portion is engaged; When the locking portion is locked to the locked portion, the locking portion rotates together with the rotation of the gear, whereby the pull-in plate moves in a direction away from the molding cavity.

3. The weather strip molding die according to claim 2.

4. When the movement of the pull-in plate is less than a predetermined distance, the locking portion rotates while being locked to the locked portion, When the movement of the pull-in plate is equal to or greater than a predetermined distance, the engagement between the engaging portion and the engaged portion is released.

4. The weather strip molding die according to claim 3.

5. the mold includes a slide plate connected to the second midplate and having a rack gear that meshes with the gear; When the gear and the rack gear are engaged with each other, the gear rotates, causing the slide plate to move in a direction away from the molding cavity.

5. The molding die for a weather strip according to claim 2, wherein the molding die is a mold for a weather strip.

6. The core has a rotation axis at an end opposite to the inner molding surface, and is rotatable about the rotation axis in a third direction away from the first center plate, A protrusion is formed on the core, and the protrusion is rotatable around the rotation axis; The slide plate is provided with a pressing portion that presses the protruding piece to rotate the core.

6. The weather strip molding die according to claim 5,

7. A third mid-plate is disposed on the upper side of the core, and an end of the third mid-plate has an outer surface forming surface that forms at least a part of the outer surface of the hollow portion, The third midplate is movable in the same manner as the central core.

7. The weather strip molding die according to claim 6.

8. A method for producing a weather strip using the mold according to any one of claims 1 to 4, an extrusion molding setting step of setting the extrusion molding in the molding die with the upper die open; a molding cavity forming step of forming the molding cavity between the inner molding surface of the core, the outer molding surface of the first middle plate, the outer molding surface of the second middle plate, and an end of the extrusion molded body while the upper mold is closed; an injection molded portion forming step of injecting a material for forming the injection molded portion into the molding cavity to form the injection molded portion at an end of the extrusion molded body; a center mold opening step for opening the center mold by opening the upper mold and moving the first center plate in a first direction away from the molding cavity, and moving the second center plate in a second direction away from the molding cavity and moving the center core in a third direction away from the first center plate in conjunction with the first center plate moving in a first direction away from the molding cavity; A method for manufacturing a weather strip, comprising:

9. 9. The method for manufacturing a weather strip according to claim 8, wherein in the inner mold opening step, the inner mold is opened with the injection molded portion of the weather strip fitted onto an end of the core.

Images