JP4816133B2 - Bowl bowl mold for toilet bowl - Google Patents

Description

  The present invention relates to a bowl part molding die for resin molding of a bowl part of a toilet bowl.

  A general toilet bowl is integrally formed of porcelain by casting, but there is a problem that deformation and cracking are likely to occur at the time of molding and the product shape cannot be complicated.

  In addition, there has been a simple toilet bowl that is integrally formed of synthetic resin as a whole. However, since it needs to be molded with a mold, it cannot be formed into a complicated shape with many undercut parts. There is a problem that it is impossible to form a toilet in which a washing water flow path through which water for washing the inner surface of the part flows is formed by a rim part or a bowl part.

  Therefore, Patent Document 1 discloses 3 pieces of a ceramic bowl portion, a synthetic resin skirt portion that accommodates the bowl portion inside, and a synthetic resin rim portion disposed at the upper end portion of the collar portion and the skirt portion. There is disclosed a toilet comprising two halves, the heel part being housed and arranged in the skirt part, and a rim part attached to the upper edge of the skirt part. Even in this toilet, the heel part is made of ceramic. It cannot be a complex shape. In addition, since the collar portion is made of ceramic with low dimensional accuracy, the collar portion and the other divided bodies cannot be bonded closely. In addition, when a cleaning water flow path is formed in which the water for cleaning the inner surface of the buttock flows near the location where the upper end of the buttock is connected to the rim, or the location where the upper end of the skirt is connected to the rim, There is a risk of water leakage.

Therefore, the present applicant has proposed a toilet in which not only the rim and skirt but also the bowl is formed of synthetic resin (see Japanese Patent Application No. 2005-144679).
Japanese Patent Laid-Open No. 10-37279

  However, as shown in FIG. 15, a drain tube portion 6 b is integrally connected to the flange portion 6 a of the bowl portion 6. In the case of forming the resin bowl portion 6 in which the flange portion 6a and the drain tube portion 6b are integrally connected, generation of a weld line becomes a problem.

  That is, when the bowl portion 6 is formed by molding, the space in which the flange portion 6a is formed (the flange portion forming space) and the space in which the drain tube portion 6b is formed (the drain tube portion forming space) are communicated. In addition, at the connecting position between the buttock molding space and the drain tube forming space, the flow of the molding resin filled in the heel molding space is hindered, and the resin passes through the drain tube forming space in the buttock molding space. It flows to wrap around. For this reason, a weld line is likely to be generated in the flange portion 6a at the position where the resin that has entered the drain tube portion forming space meets in the flange forming space, which may cause a problem in appearance and strength. FIG. 17 shows the flow direction of the molding resin during molding of the bowl 6a and the drain tube 6b of the bowl 6 obtained by molding by arrows and the generation position of the weld line by reference numeral 11. Reference numeral 12 denotes a molded body solidified in the sprue at the time of molding the mold.

  The present invention has been made in view of the above points. In obtaining the resin bowl portion 6 in which the flange portion 6a and the drain tube portion 6b are integrated by molding, the occurrence of a weld line is prevented. An object of the present invention is to provide a bowl part molding die that can be prevented.

  The toilet bowl forming mold according to the present invention is provided with a bowl portion 6 for toilet bowl formation having a flange portion 6a and a drain tube portion 6b integrated so as to communicate with the flange portion 6a. And a drainage which has the same shape as the collar part 6a and has the same shape as the drainage cylinder part 6b and communicates with the collar part molding space 1a. The tube forming space 1b communicates with the flange forming space 1a and the drain tube forming space 1b at the connecting position between the flange forming space 1a and the drain tube forming space 1b, and the inside of the flange 6a and the drain tube. A bypass space 1c that divides the inside of the portion 6b is formed.

  For this reason, when forming the bowl part 6 by resin molding using this mold, the molding resin 7 injected into the mold is at the connection position of the flange part molding space 1a and the drain tube part molding space 1b. It flows into the bypass space 1c and the flow of the molding resin 7 is not hindered at the connection position of the drain tube portion molding space 1b, and the detouring or association of the molding resin 7 is less likely to occur.

  In this bowl part molding die for toilet bowl, with respect to the said collar part molding space 1a, with respect to the said collar part inner mold part 4 arrange | positioned in the position equivalent to the inner side of the collar part 6a, and the said drain cylinder part molding space 1b While having the drain cylinder part inner mold part 5 disposed at a position corresponding to the inside of the drain cylinder part 6b, the bypass space 1c is formed between the collar part inner mold part 4 and the drain cylinder part inner mold part 5, And it is preferable that the said drain cylinder part inner type | mold part 5 is formed so that advance / retreat movement is possible with respect to the collar part inner mold part 4. In this case, the gap of the bypass space 1c can be adjusted by moving the drain tube inner mold part 5 forward and backward, and when the resin molding 7 is injected, the gap dimension is sufficiently secured and the bypass space 1c is interposed. By sufficiently ensuring the flow of the molded resin 7 and then reducing the gap size, the size of the molded body 6c solidified in the bypass space 1c can be reduced. Further, when performing multicolor molding using the core material 7b and the skin material 7a as the molding resin 7, the gap size is reduced when the skin material 7c is injected after the core material 7b is injected. The pressure applied to the bypass space 1c can be increased and the core material 7b in the bypass space 1c can be pushed out. For this reason, the core material 6a is not exposed on the fracture surface when the molded body 6c formed in the bypass space 1c is removed from the formed bowl portion 6.

  It is also preferable that the gap size at the outer edge portion of the bypass space 1c be smaller than the gap size at other portions of the bypass space 1c. In this case, the thickness of the outer edge portion of the molded body 6c solidified in the bypass space 1c can be formed thin, and can be easily removed when the molded body 6c is removed from the bowl portion 6. . Further, the pressure when the molding resin 7 enters the bypass space 1c can be increased, and when performing multicolor molding using the core material 7b and the skin material 7a as the molding resin 7, the core material 7b. Then, the core material 7b in the bypass space 1c can be pushed out when the skin material 7a is injected. For this reason, the core material 7b is not exposed at the fracture surface when the molded body 6c formed in the bypass space 1c is removed from the formed bowl portion 6.

  In addition, the method for producing a bowl part for a toilet according to the present invention, the molding resin 7 is injected into the bowl part molding die for the toilet bowl while the toilet bowl part molding die as described above is clamped, The molded body formed in the bypass space 1c from the bowl portion 6 obtained after the molding resin 7 is filled and solidified in the flange molding space 1a, the drain tube molding space 1b, and the bypass space c and solidified. 6c is removed.

  For this reason, the molding resin injected into the mold flows into the bypass space 1c at the connecting position between the flange forming space 1a and the drain tube forming space 1b, and is molded at the connecting position of the drain tube forming space 1b. The flow of the resin for resin is not hindered, and detouring or association of the molding resin is less likely to occur.

  According to the present invention, a resin bowl portion in which the flange portion and the drain tube portion are integrated by resin molding can be obtained by mold molding, and a weld line is generated in the obtained bowl portion. This can be prevented.

  Hereinafter, the best mode for carrying out the present invention will be described.

  A bowl part molding die (hereinafter referred to as a mold) according to the present invention is for forming a bowl part 6 having a flange part 6a and a drain tube part 6b integrally connected to the flange part 6a. is there.

  As shown in FIGS. 14 and 15, this bowl portion 6 can be combined with a skirt portion 9 covering the bowl portion 6 and a rim portion 10 disposed on the upper end portion of the bowl portion 6 to form a toilet. As shown in FIG. 16, the rim portion 10 includes a cleaning water channel 44 disposed inside the upper end opening edge 43 of the bowl unit 6, and a cleaning water channel 44 and a flange 6a in the lower part of the cleaning water channel 44. And a washing water outlet 45 that communicates with each other.

  Thus, each of the bowl part 6, the skirt part 9, and the rim part 10 is made into an independent synthetic resin divided body, and a toilet is formed by bonding and integrating these three synthetic resin divided bodies by welding. be able to.

  The bowl portion 6a of the bowl portion 6 is formed in a bowl shape opened upward, with the die-cutting direction being the vertical direction, and a drainage cylinder portion 6b that protrudes rearward is integrally formed at the bottom thereof. is there. At this time, an undercut portion is formed between the outer surface of the flange portion 6a and the outer surface of the drain tube portion 6b, and an undercut portion is also formed inside the drain tube portion 6b.

  1 to 3 show an example of a mold for forming the bowl portion 6. 1 and 2 are sectional views of the mold, FIG. 3 is a plan view showing the movable portion 13 in the mold, FIG. 1 is a sectional view taken along the line AA in FIG. 3, and FIG. This corresponds to a cross-sectional view of the B cross section. In the following description, the vertical and horizontal directions are defined in the direction shown in FIG. 1 unless otherwise specified.

  In the illustrated mold, the fixed side portion 14 is disposed above and the movable side portion 13 is disposed below, so that the mold clamping direction and the mold opening direction coincide with the vertical direction of the drawing.

  In the movable side portion 13 of this mold, a movable side mold plate 17 is provided above the movable side mounting plate 15 via a spacer block 24. On the movable side mold plate 17, the inner shape of the flange portion 6a is formed. The matching movable mold part (inner collar part 4) is supported. A support pillar 16 is interposed between the movable side mounting plate 15 and the movable side mold plate 17 below the inner mold part 4 of the flange.

  A knockout plate 21 is disposed on the movable side mold plate 17 so as to surround the entire side periphery of the inner mold part 4 of the buttock. An ejector plate 18 is disposed between the movable side mounting plate 15 and the movable side mold plate 17 to drive the space in the vertical direction. The ejector plate 18 is provided with a through hole at a position where the support pillar 16 is disposed. The ejector plate 18 is provided with a plurality of knockout pins 19 protruding upward. Each knockout pin 19 is inserted into a through hole 20 that penetrates the movable side mold plate 17 in the vertical direction, and the tip of the knockout pin 19 is connected to the lower surface of the knockout plate 21.

  Further, a first slide core 22 and a second slide core (drain tube inner mold part 5) are provided on the movable side mold plate 17 as slide cores.

  The first slide core 22 is disposed on the side (right side) of the flange inner mold portion 4, and the surface facing the flange inner mold portion 4 is the flange 6a and the drain tube portion 6b on the outer surface of the flange 6a. It is arranged along the undercut portion between the two. The first slide core 22 moves forward and backward in the left-right direction orthogonal to the mold clamping direction so as to be close to and away from the collar part inner mold part 4, so that the undercut is performed when the bowl part 6 is removed from the mold. It is formed so that it can be saved from the department. Here, the movable side template 17 is provided with a guide plate 24 disposed below the first slide core 22 and guide rails 25 disposed on both sides of the first slide core 22. The first slide core 22 is supported by the guide plate 24 and the guide rail 25 so as to be slidable with respect to the movable side mold plate 17. Further, the first slide core 22 is provided with an insertion hole 32 through which an angular pin 31 described later is inserted so as to incline downward toward the retracting direction of the first slide core 22.

  Further, the movable side template 17 is provided with a slide stopper 26 for limiting the slide width when the first slide core 22 moves in the retracting direction. The slide stopper 26 is provided so as to protrude outward from one side of the right side of the movable side mold plate 17, and when the first slide core 22 is retracted, the first slide is reached. It has a stopper piece 26 a that abuts against the end face of the core 22 on the retracting direction side.

  In addition, a guide hole 39 that opens toward the flange inner mold portion 4 is provided in the upper portion of the first slide core 22, and the drain tube inner mold portion 5 is provided in the guide hole 39. 4 is inserted so as to be able to move forward and backward in the left-right direction so as to be close to and away from 4. This drain cylinder inner mold part 5 is formed in a shape that matches the inner surface shape of the drain cylinder part 6 b and is provided so as to protrude from the opening in the guide hole 39 toward the collar inner mold part 4. In the portion protruding from the guide hole 39, a gap (a part of the drain tube portion molding space 1b described later) is formed below the drain tube portion inner mold portion 5 between the first slide core 22 and the drain tube portion 6b. Part) is formed. The first slide core 22 is provided with an air cylinder as a drive source 23 for driving the sliding movement of the drain tube inner mold portion 5. The drive source 23 is not limited to an air cylinder, and an appropriate drive source 23 such as a hydraulic cylinder or a servo motor can be used. These drive sources 23 can be miniaturized and contribute to the miniaturization of the mold.

  The movable mold plate 17 is formed with an opening space 33 in which the tip of the angular pin 31 is disposed when the mold is clamped.

  On the other hand, in the fixed side portion 14 of the mold, a fixed side mold plate 29 is supported and provided below the fixed side mounting plate 28. The fixed-side mold plate 29 is provided with a recess 30 that opens downward and to one side (rightward). Inside the recess 30, the inner mold part 4 and the slide core are disposed when the mold is clamped. It has come to be. Further, a sprue bush 34 is inserted into an insertion hole 41 penetrating the inner surface of the concave portion 30 of the fixed side mold plate 29 and the outer surface of the fixed side mounting plate 28, and a locating ring 35 is attached to the fixed side mold plate 29. Is installed.

  In addition, the fixed-side template 29 is provided with an angular pin 31 that guides the movement in the direction of retracting from the undercut portion of the first slide core 22 when the die is opened so as to protrude from the upper bottom surface of the recess 30. ing. In addition, a locking block 36 is provided that contacts the first slide core 22 during mold clamping and prevents retreat in the retracting direction.

  The fixed side portion 14 and the movable side portion 13 are arranged in a state of being aligned facing each other in the vertical direction, and the movable side portion 13 is formed so as to be able to approach and separate in the vertical direction with respect to the fixed side portion 14. . At this time, a plurality of guide pins 37 protruding upward are provided on the movable side mold plate 17, and a plurality of guide bushes 38 through which the guide pins 37 are inserted are mounted on the fixed side mold plate 29. This guides the movement of the movable side portion 13 relative to the fixed side portion 14 during mold clamping and mold opening.

  In a state where the mold is clamped, the molding space 1 surrounded by the fixed side mold plate 29, the movable side mold plate 17, the first slide core 22 and the drain cylinder inner mold portion 5 is turned upside down on the bowl portion 6. The shape is the same as the orientation. At this time, the collar forming space 1a in which the collar 6a is formed is formed in a space surrounded by the outer surface of the collar inner mold part 4, the fixed side mold plate 29 and the first slide core 22, and this A knockout plate 21 is disposed at the lower end of the flange forming space 1a. Moreover, the drain cylinder part forming space 1b in which the drain cylinder part 6b is formed is formed in a space surrounded by the outer peripheral surface of the drain cylinder part 6b mold part, the first slide core 22 and the fixed side mold plate 29. The

  Further, the sprue 42 in the sprue bush 34 communicates with the upper end of the flange forming space 1a, and the gate 8 is arranged at a position corresponding to the bottom top of the flange 6a. Here, the gate 8 is not formed at least at a position corresponding to the edge of the flange 6a, and preferably the distance from the gate 8 to the entire edge of the flange 6a is all the same.

  Further, at the time of clamping, the end surface of the drain tube inner mold portion 5 is disposed at a position separated from the outer surface without contacting the outer surface of the flange inner mold portion 4, and the outer surface of the flange inner mold portion 4 and the drain tube. A bypass space 1 c is formed between the end face of the internal mold part 5. The bypass space 1c is connected to the flange forming space 1a and the drain tube forming space 1b over the entire circumference at a connection position between the flange forming space 1a and the drain tube forming space 1b. It arrange | positions in the position which divides the inside of the collar part 6a formed in the space 1, and the inside of the drain pipe part 6b. At this time, it is preferable that the end surface of the drain tube inner mold portion 5 and the outer surface of the flange inner mold portion 4 facing the end surface are arranged substantially in parallel.

  The gap dimension corresponding to the thickness of the molded product in the flange forming space 1a and the drain tube forming space 1b as described above is set as appropriate, and can be set to a range of 3 to 7 mm, for example.

  Moreover, the clearance dimension between the outer surface of the drain cylinder inner mold part 5 and the end surface of the collar inner mold part 4 in the bypass space 1c is driven with respect to the first slide core 22 by driving a drive source 23 such as an air cylinder. It can be adjusted by sliding the drain cylinder inner mold part 5.

  Moreover, although the clearance gap dimension between the end surface of the drain cylinder part inner mold part 5 in the bypass space 1c and the outer surface of the collar part inner mold part 4 can also be formed substantially the same, the collar part molding space 1a and The clearance space of the bypass space 1c at the connection portion with the drain tube portion forming space 1b is narrower than the other portions of the bypass space 1c, and the clearance dimension of the outer edge portion of the bypass space 1c is equal to that of the bypass space 1c. It is preferable to make it smaller than the gap size in this part. For example, a gap adjusting rib 40 protruding toward the outer surface of the flange inner mold part 4 facing the end surface is provided on the outer edge part of the end surface of the drain tube inner mold part 5 over the entire circumference. A gap adjusting rib 40 that protrudes toward the drain tube inner mold part 5 may protrude from a portion of the flange inner mold part 4 that faces the outer edge of the drain tube inner mold part 5. Moreover, you may provide the clearance gap adjustment rib 40 in both the end surface of the drain cylinder part inner mold part 5, and the outer surface of the collar part inner mold part 4 (refer FIGS. 11-13). At this time, in the state where the molded product is finally formed in the molding space 1 (see FIG. 13), the gap (gap adjustment rib 40 is formed in the outer edge portion where the gap dimension of the bypass space 1c is small. It is preferable that the gap at the location is a value obtained by multiplying the gap size of the other part of the bypass space 1c by 0.8 to 0.9.

  The mold is provided with a pressure sensor 27. The pressure sensor 27 is formed in the molding space 1 after the molding resin 7 injected from the gate 8 into the molding space 1 is completely filled in the bypass space 1c in the molding process of the bowl portion 6 by a mold. By detecting the pressure at the position where the molding resin 7 that has flowed out of the bypass space 1c arrives in a state where the molding resin 7 is not completely filled, the molding resin 7 has no gap in the bypass space 1c. A state is detected in which the molding resin 7 is filled and the molding space 1 is not yet completely filled (see FIG. 5). The pressure detection position by the pressure sensor 27 is set as appropriate. In the example shown in the drawing, the pressure detection position by the pressure sensor 27 is located between the first slide core 22 and the buttock inner mold part 4. The detection positions by the gate 8, the bypass space 1c, and the pressure sensor 27 all appear in the same section parallel to the mold clamping and mold opening directions, and the detection position by the pressure sensor 27 is in the bypass space 1c. On the other hand, it is located on the opposite side to the gate 8.

  Below, an example of the formation method of the bowl part 6 by resin molding using this metal mold | die is shown.

  As the molding resin 7, it is possible to use relatively strong acrylic resin, ABS resin mixed with a reinforcing material such as glass fiber, PBT resin, or the like.

  Injection of the molding resin 7 into the mold is performed by connecting an injection molding machine to the locating ring 35 with the mold clamped and injecting the molding resin 7 into the mold in this state. At this time, the gap dimension of the bypass space 1c (excluding the gap dimension of the outer edge portion of the bypass space 1d when the gap adjustment rib 40 is provided) is adjusted by adjusting the arrangement position of the drain tube inner mold part 5, The clearance dimension between the bowl part forming space 1a and the drain tube part forming space 1b is preferably a value obtained by multiplying 1 to 1.5.

  As shown in FIG. 4, the molding resin 7 injected into the mold is injected from the gate 8 into the molding space 1 and flows so as to spread in all directions around the gate 8. At this time, the flow path of the molding resin 7 is that which flows in the flange forming space 1a toward the position corresponding to the edge of the flange 6a, and the drain tube portion forming space 1b after flowing into the bypass space 1c. And branching into the buttocks molding space 1a. Moreover, a part flows in into the drain cylinder part forming space 1b directly from the collar part forming space 1a.

  At this time, the molding resin 7 filled in the collar molding space 1a is a gate regardless of whether the resin flows only in the collar molding space 1a or passes through the bypass space 1c. It flows and fills from 8 to a position corresponding to the edge of the flange 6a. For this reason, detouring or association of the molding resin 7 is less likely to occur in the buttock molding space 1a.

  In addition, most of the molding resin 7 filled in the drain tube portion molding space 1b flows into the drain tube portion molding space 1b via the bypass space 1c. At this time, since the drain tube portion forming space 1b is connected to the bypass space 1c over the entire circumference, the inflow from the bypass space 1c to the drain tube portion forming space 1b has the same effect as the disk gate, and the drain tube In the part molding space 1b, the molding resin 7 flows from the connection position between the bypass space 1c and the drainage cylinder part molding space 1b toward the position corresponding to the edge of the drainage cylinder part 6b, so that the molding resin 7 is bypassed. And meetings are less likely to occur.

  In such a process of injecting the molding resin 7, by ensuring that the gap space of the bypass space 1c is sufficiently large as described above until the molding resin 7 is completely filled in the bypass space 1c. Promoting the inflow of the molding resin 7 into the bypass space 1c and promoting the movement of the molding resin 7 to the flange molding space 1a and the drain tube molding space 1b via the bypass space 1c as described above. Is preferred.

  Further, after the molding resin 7 is filled in the bypass space without any gap, the drain tube portion inner mold portion 5 is filled until the molding resin 7 is completely filled in the molding space 1 (see FIG. 5). It is preferable to reduce the gap size of the bypass space 1c by moving the head toward the inner mold part 4 of the collar. The clearance dimension of the bypass space 1c after the movement of the drain cylinder inner mold part 5 (excluding the clearance dimension of the outer edge portion of the bypass space 1d when the clearance adjustment rib 40 is provided) is the bowl part forming space 1a and the drainage. It is preferable to make it the value which multiplied 0.8-0.9 to the clearance gap dimension of the cylinder part shaping | molding space 1b. At this time, as described above, when the gap adjusting rib 40 is provided, the gap of the outer edge portion where the gap adjusting rib 40 of the bypass space 1c is formed is equal to the gap size of the other part of the bypass space 1c. It is preferable that the dimension is a value obtained by multiplying by .8 to 0.9. In this case, the thickness of the molded body 6c to be solidified in the bypass space 1c can be reduced, making it easy to remove the molded body 6c from the bowl portion 6 that is a product, and the amount of the molded body 6c that becomes waste. Can be reduced.

  Such timing control for moving the drain tube inner mold portion 5 can be performed based on the detection result of the pressure sensor 27 described above. As described above, the pressure sensor 27 detects a state (FIG. 5) in which the molding resin 7 is filled in the bypass space without a gap and the molding resin 7 is not completely filled in the molding space 1 yet. Therefore, when the state is detected by the pressure sensor 27, the driving source 23 such as an air cylinder is driven to move the drain cylinder inner mold portion 5 to reduce the gap in the bypass space 1c. FIG. 10 is a conceptual diagram showing an example of this control mechanism. The signal detection unit receives a detection signal from the pressure sensor 27 and outputs a control signal to the drive control unit when the detected pressure exceeds a predetermined pressure. The drive control unit drives and controls a drive source 23 such as an air cylinder that drives the drain cylinder inner mold unit 5 based on the control signal.

  Then, as shown in FIG. 6, when the molding resin 7 spreads in the molding space 1 and is cooled and solidified, the mold is opened. At this time, since the bowl portion 6 is a large molded product, it is also preferable to perform mold opening after annealing.

  When opening the mold, first, as shown in FIG. 7, the drain cylinder inner mold part 5 is moved in a direction away from the collar inner mold part 4, that is, in a direction of pulling out from the drain cylinder part 6b. At this time, as shown in the drawing, the drain tube portion inner mold portion 5 may not be completely pulled out from the drain tube portion 6b.

  Next, as shown in FIG. 8, the movable side portion 13 of the mold is moved downward in a direction away from the fixed side portion 14. At this time, the molded bowl portion 6 remains on the movable side portion 13 side and is detached from the fixed side portion 14. As the movable side portion 13 moves, the first slide core 22 is guided by the angular pin 31 and moves away from the flange inner mold portion 4, and is detached from the flange portion 6a and retracted from the undercut portion. To do. At this time, the drain cylinder inner mold part 5 also moves together with the first slide core 22 and is completely pulled out from the drain cylinder 6b and retracts from the undercut part.

  Next, as shown in FIG. 9, when the ejector plate 18 is driven upward, the knockout plate 21 rises via the knockout pin 19, pushes up the edge of the flange portion 6 a, and moves the bowl portion 6 to the movable side portion. Demold from 13. At this time, since the first slide core 22 and the drain cylinder inner mold part 5 are retracted as described above, the undercut part is removed without being caught.

  And the molded object 6c solidified in the bypass space 1c and the molded object 12 solidified by the sprue 42 are removed from the bowl part 6 obtained in this way. At this time, if the gap size of the outer edge portion of the bypass space 1c is reduced as described above, the outer edge portion of the molded body 6c is formed thin and can be easily removed from the bowl portion 6.

  The bowl portion 6 thus obtained may be coated with a general hard coat material as required to improve the appearance.

  When the bowl portion 6 is obtained by resin molding as described above, not only a single type of molding resin 7 is used, but also multicolor molding can be performed using two or more types of molding resins 7, for example, the bowl portion 6 Can be formed using two types of molding resins 7 including a core material 7b and a skin material 7a. In this case, for example, an inexpensive material or a material for securing the strength is used as the core material 7b, and an expensive material or a material having an excellent appearance is used as the skin material 7a, and the skin material 7a is provided on the outer surface of the bowl portion 6. It can be shaped so that only is exposed.

  The operation of the mold when molding using the core material 7b and the skin material 7a is the same as the above case except for the injection operation of the molding resin 7.

  That is, at the time of resin molding, first, only the skin material 7a is injected into the mold (see FIG. 11), and before the pressure of the molding resin 7 is detected by the pressure sensor 27 (see FIG. 4), the skin material 7a is injected. And the core material 7b is injected into the mold. Here, the skin material 7a already injected into the molding space 1 is cooled from the inner surface side of the molding space 1, and the fluidity of the skin material 7a is reduced in the vicinity of the inner surface, but is present inside the skin material 7a. The skin material 7a retains fluidity. For this reason, the core material 7b is injected into the molding space 1 while pushing the skin material 7a existing inside the molding space 1 (see FIG. 12).

  Thus, the core material 7b is injected, the pressure sensor 27 fills the bypass space 1c with the molding resin 7 without any gaps, and the molding resin 7 is not yet completely filled into the molding space 1. Is detected (see FIG. 5), the drain cylinder inner mold portion 5 is driven to reduce the gap in the bypass space 1c as in the above case. At this time, the injection of the core material 7b is stopped, and the skin material 7a is injected again into the mold. As a result, the skin material 7a injected into the mold is filled into the molding space 1 while pushing in the core material 7b that has not lost its fluidity (see FIG. 13).

  The state of the flow of the skin material 7a and the core material 7b in the vicinity of the bypass space 1c at this time is schematically shown in FIGS. When the core material 7b is injected after the skin material 7a is injected into the molding space 1 as shown in FIG. 11, the skin material 7a exists in the vicinity of the inner surface of the molding space 1 in the molding space 1 as shown in FIG. And the core material 7b exists in the inside. When the skin material 7a is injected again in this state, as shown in FIG. 13, the portion of the core material 7b that does not lose the inner fluidity is pushed in and flows together with the skin material 7a. At this time, since the gap of the bypass space 1c is narrowed due to the movement of the mold in the drain cylinder, the inflow pressure of the skin material 7a into the bypass space 1c increases. In particular, when the gap at the outer edge of the bypass space 1c is reduced by the gap adjusting rib 40 or the like, the inflow pressure is further increased. For this reason, the skin material 7a applies a larger pressing force in the bypass space 1c than other parts in the molding space 1, and even if the fluidity of the core material 7b in the bypass space 1c is low, All of the core material 7b can be pushed out from within the bypass space 1c (particularly from the outer edge portion of the bypass space 1c).

  Then, when the molding resin 7 spreads in the molding space 1 and is cooled and solidified, the mold is opened in the same manner as described above, and the molded body 6c cooled and solidified in the bypass space 1c is obtained from the bowl portion 6 obtained. To be removed. The bowl portion 6 thus obtained has a structure in which the skin material 7a is exposed on the outer surface and the core material 7b is present on the inner side.

  At this time, in removing the molded body 6c cooled and solidified in the bypass space 1c, the core material 7b is removed from the bypass space 1c as described above. Not included. Therefore, the core material 7b does not appear on the fractured surface after the molded body is removed from the bowl portion 6, and appearance deterioration due to the appearance of the core material 7b does not occur.

It is sectional drawing which shows an example of embodiment of this invention. It is other sectional drawing same as the above. It is a top view which shows a movable part same as the above. It is sectional drawing which shows operation | movement of embodiment same as the above. It is sectional drawing which shows the operation | movement following the operation | movement shown in FIG. 4 of embodiment same as the above. It is sectional drawing which shows the operation | movement following the operation | movement shown in FIG. 5 of embodiment same as the above. It is sectional drawing which shows the operation | movement following the operation | movement shown in FIG. 6 of embodiment same as the above. It is sectional drawing which shows the operation | movement following the operation | movement shown in FIG. 7 of embodiment same as the above. It is sectional drawing which shows the operation | movement following the operation | movement shown in FIG. 8 of embodiment same as the above. It is a conceptual diagram which shows an example of the movement control mechanism of a drain cylinder part inner mold part. It is principal part sectional drawing in an example of embodiment same as the above. It is principal part sectional drawing in an example of embodiment same as the above. It is principal part sectional drawing in an example of embodiment same as the above. It is a disassembled perspective view of a toilet bowl. It is a sectional side view of a toilet bowl same as the above. (A) is the A section enlarged view of FIG. 15, (b) is BB sectional drawing of FIG. 15, (c) is the C section enlarged view of FIG. It is a perspective view of the bowl part for demonstrating the problem of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Saddle part molding space 1b Drain tube part molding space 1c Bypass space 4 Saddle part inner mold part 5 Drain part cylinder part inner mold part 6 Bowl part 6a Saddle part 6b Drain tube part 6c Molded body 7 Molding resin

Claims (4)

  A mold for forming a bowl portion for toilet bowl formation having a collar part and a drainage cylinder part integrated so as to communicate with the collar part. A flange forming space having the same shape as the drain tube, a drain cylinder forming space having the same shape as the drain tube portion and communicating with the flange forming space, and a connection between the flange forming space and the drain tube portion forming space. A bowl part molding die for a toilet bowl, characterized in that a bypass space is formed which communicates with the collar part molding space and the drainage cylinder part molding space at a position and divides the interior of the collar part and the interior of the drainage cylinder part. The inner mold part of the collar part disposed at a position corresponding to the inner side of the collar part with respect to the collar part molding space, and the drainage cylinder disposed at a position corresponding to the inner side of the drainage cylinder part with respect to the drainage cylinder part molding space. And a bypass space is formed between the inner mold part of the flange part and the inner mold part of the drainage cylinder part, and the inner mold part of the drainage cylinder part is formed to be movable forward and backward with respect to the inner mold part of the collar part. The bowl part molding die for toilet bowl according to claim 1, wherein   The bowl part molding die for a toilet bowl according to claim 1 or 2, wherein a gap dimension of an outer edge portion of the bypass space is smaller than a gap dimension in other parts of the bypass space. A molding resin is injected into the bowl part molding die for toilet bowl in a state in which the toilet bowl part molding die according to any one of claims 1 to 3 is clamped, and a heel part molding space and a drain tube part molding are formed. A method for producing a bowl part for a toilet bowl, wherein the molding resin formed in the bypass space is removed from the obtained bowl part after the molding resin is filled and solidified in the space and the bypass space. .

Images