JP2011088395A - Mold and molding method of resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold and a molding method of a resin molding which facilitate the positioning of a vent nozzle to a mold body. <P>SOLUTION: An engaging part 35 is prepared at an overhanging part 30 of the vent nozzle 7; a clearance 40 for inserting the overhang part 30 is prepared at a mold body 2; a hole 21 for the vent nozzle through which the overhang part 30 can pass when the overhang part is in a given rotation posture is prepared between the clearance 40 and the outside; an engaging target 41 engaged with the engaging part 35 is prepared in the clearance 40; a slope 42 is prepared at one or both of the engaging part 35 and the engaging target 41; and the vent nozzle 7 can rotate only at a given rotation angle in a state that it is inserted to a vent nozzle inserting hole 6, that the overhang part 30 is in the clearance 40 and that the engaging part 35 and the engaging target 41 are in contact with each other. The vent nozzle 7 can be driven in the axial direction of the vent nozzle insertion hole 6 by a drive force which is generated by the slope 42 when the vent nozzle 7 is rotated in that state. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a molding die and a method for molding a resin molded product, and more specifically, a molding die provided with a vent nozzle insertion hole for inserting a vent nozzle in a die body, and the molding die. The present invention relates to a method for molding a resin molded product. INDUSTRIAL APPLICABILITY The present invention is useful for molding resin molded products such as wash basins, kitchen utensils and bathtubs.

  Resin washbasins, kitchen tops, bathtubs, etc. are lighter and stronger than conventional stainless steel, enamel, and pottery products, and they are more excellent in design. . A resin washstand or the like is a resin molded product that is molded by injecting resin into a molding die. Patent Document 1 discloses a molding method in which a resin is injected into a molding die and molded.

JP2005-306006

  A method for molding a resin molded article using the molding die disclosed in Patent Document 1 will be described with reference to a molding die 79 (FIG. 5) having substantially the same configuration as the molding die. The molding die 79 includes a die body 80 and a vent nozzle 85 as shown in the cross-sectional view of FIG. The mold body 80 includes an upper mold 81, a lower mold 82, a vent collar 83, and a round nut 84. Between the upper mold 81 and the lower mold 82, there is a molding cavity 88 that is a space for injecting the resin 90. When the resin 90 is injected into the molding cavity 88 and the resin 90 is cured, a resin molded product 91 is obtained. In the molding die 79, a placement element 89, which is a die for forming a hole in the resin molded product 91, is installed.

  The vent nozzle 85 is a tube for discharging air, gas, and the like in the molding cavity 88. The vent nozzle 85 can be removed from the vent collar 83. The removed vent nozzle 85 becomes a nozzle that adds compressed air when the vent piece 86 and the vent tube 87 provided in the vent nozzle 85 are removed, and is inserted into the vent collar 83 again to add the compressed air into the molding die 79. Thus, the resin molded product 91 can be removed from the molding die 79.

  Here, a method for positioning the vent nozzle 85 in the molding die 79 will be described. “Positioning” refers to engaging the vent nozzle 85 with the molding die 79 at an accurate position. When the screw portion (not shown) provided on the outer periphery of the overhang portion 92 of the vent nozzle 85 and the screw portion (not shown) provided on the inner periphery of the round nut 84 are accurately engaged, the vent nozzle 85 is provided. Is accurately positioned to the vent collar 83. However, as shown in FIG. 6, if the overhanging portion 92 and the round nut 84 are not accurately engaged, the insertion of the vent nozzle 85 into the vent collar 83 becomes insufficient, and the molding cavity 88 is formed in the vent collar 83. The resin 88 enters from the inside. The resin 88 that has entered the vent collar 83 is difficult to remove, resulting in a significant time loss at the manufacturing site.

  Therefore, an object of the present invention is to provide a molding die that facilitates positioning of the vent nozzle to the die body, and a method for molding a resin molded product using the molding die.

  The invention according to claim 1 for solving the above-mentioned problem has a mold body having a molding cavity, a vent nozzle for extracting air from the molding cavity, and a vent nozzle for inserting the vent nozzle into the mold body. In a molding die provided with an insertion hole, a protruding portion is provided in a part of the vent nozzle, an engaging portion is provided in the protruding portion, and a gap portion in which the protruding portion is inserted in the mold body A passing opening is provided between the gap and the outside so that the projecting part can pass when the protruding part is in a predetermined rotation posture, and the engaged part is engaged with the engaging part in the gap. One or both of the engaging portion and the engaged portion have an inclined portion, the vent nozzle is inserted into the vent nozzle insertion hole, and the overhang portion is in the gap portion, and the engaging portion Rotate only within a certain rotation angle with the engaged part in contact An ability the inclined portion generates a propulsive force by rotating the vent nozzle in a state in which the above-mentioned, a molding die, characterized in that propel the vent nozzle in the axial direction of the vent nozzle insertion hole.

  The molding die of the present invention is provided with an overhang part in a part of the vent nozzle, the overhang part has an engaging part, and the mold body has a gap part into which the overhang part is inserted, A passage opening is provided between the gap portion and the outside so that the protruding portion can pass when the projecting portion is in a predetermined rotational posture, and an engaged portion that engages with the engagement portion is provided in the gap portion. Is provided. Therefore, in the molding die of the present invention, the bent nozzle overhang can be inserted into the gap of the mold body only when the bent nozzle overhang and the passage opening substantially match.

  The molding die of the present invention has an inclined portion in one or both of the engaging portion and the engaged portion, the vent nozzle is inserted into the vent nozzle insertion hole, and the protruding portion is in the gap portion. The engagement portion and the engaged portion are in contact with each other and can be rotated only at a certain rotation angle, and the inclined portion generates a propulsive force by rotating the vent nozzle in the above-described state, The vent nozzle is propelled in the axial direction of the vent nozzle insertion hole. “The inclined portion generates a propulsive force” means that the inclined portions provided on one or both of the vent nozzle and the mold main body are pressed against each other. Therefore, in the molding die of the present invention, when the vent nozzle is inserted into the vent nozzle insertion hole and rotated, the vent nozzle and the mold body rotate only at a certain rotation angle while pressing each other. The mold body can be fixed.

  According to the molding die of the present invention, it is easy to position the vent nozzle on the die body.

  The invention described in claim 2 is a method for molding a resin molded product, wherein the resin molded product is molded using the molding die according to claim 1.

  The method for molding a resin molded product of the present invention is a method of molding a resin molded product using the molding die of the present invention. As described above, by using the molding die of the present invention, the positioning of the vent nozzle to the die body is facilitated, and the resin can be prevented from entering into unnecessary portions when resin molding is performed. According to the method for molding a resin molded product of the present invention, the resin molded product can be efficiently manufactured.

  According to the molding die of the present invention, it is easy to position the vent nozzle on the die body.

  According to the method for molding a resin molded product of the present invention, the resin molded product can be efficiently manufactured.

It is sectional drawing which shows the internal structure of the shaping die which concerns on embodiment of this invention. It is a figure which shows the positioning nut of the molding die concerning embodiment of this invention, (a) is a front view, (b) is AA sectional drawing of (a), (c) is a bottom view. . (A) is the perspective view which looked at the positioning nut of FIG. 2 from the back surface, (b) and (c) are both partially broken perspective views of (a). It is a perspective view which shows the positioning nut and vent nozzle of the molding die which concern on embodiment of this invention, (a) is the state before both engage, (b) is the state where the vent nozzle was inserted in the positioning nut , (C) shows a state in which the vent nozzle is rotated 90 degrees counterclockwise from the state of (b). It is sectional drawing which shows the internal structure of the conventional resin molded product, and shows the state by which the vent nozzle was correctly positioned by the metal mold body. It is sectional drawing which shows the internal structure of the conventional resin molded product, and shows the state in which insertion of the vent nozzle to a metal mold body is inadequate.

  Hereinafter, embodiments of a molding die and a method for molding a resin molded product according to the present invention will be described in detail with reference to the drawings. In addition, the following description is for facilitating the understanding of the embodiment, and the present invention should not be understood to be limited thereby.

  First, the configuration of the molding die 1 according to the embodiment of the present invention will be described. As shown in the cross-sectional view of FIG. 1, the molding die 1 includes a die body 2 and a vent nozzle 7.

  The mold body 2 includes an upper mold 3, a lower mold 4, a vent collar 5, and a positioning nut 20. The upper mold 3 and the lower mold 4 are molds for resin molding. Between the upper mold 3 and the lower mold 4, there is a molding cavity 10 that is a space for injecting the resin 60. The shape of the molding cavity 10 is the shape of a resin molded product. In the mold body 2, a placement element 11, which is a mold for forming a hole in the resin molded product 61, is placed.

  The vent collar 5 is a hollow tube having a vent nozzle insertion hole 6, and includes a flange portion 12 for fixing a positioning nut 20 and locking the vent nozzle 7 in the vicinity of the upper opening. . The vent collar 5 is joined to the upper mold 3 without a gap by welding or the like.

  The vent nozzle 7 is a metal pipe for discharging air, gas, and the like in the molding cavity 10. Further, the resin 60 is poured into the molding cavity 10 by overflowing the resin 60 from the vent nozzle 7 until it overflows. It can be confirmed that it has been filled reliably. The vent nozzle 7 has a cross shape in a cross-sectional view, and includes a pipe body 29 and an overhang portion 30.

  The tube body 29 is a hollow tube, and includes a handle 16 and two O-rings 17 around the tube body 29. The handle 16 is a grip for rotating the vent nozzle 7. The O-ring 17 is for preventing the resin 60 from entering between the vent collar 5 and the vent nozzle 7. In the pipe body 29, a vent piece 8 and a vent tube 9 are provided. The vent piece 8 is an opening for introducing the resin 60 and the like in the molding cavity 10 into the vent nozzle 7. The vent tube 9 is a resin tube for discharging the resin 60 introduced from the vent piece 8 to the outside of the vent nozzle 7. The vent piece 8 and the vent tube 9 can be detached from the vent nozzle 7.

  The overhang portion 30 is an overhang portion for engaging the vent nozzle 7 with the positioning nut 20, and also serves as the engagement portion 35. As shown in the perspective view of FIG. 4A, two portions are joined to the upper portion of the tube main body 29. A ball plunger hole 31 for fixing a ball plunger 44 of a positioning nut 20 described later is provided on the upper surface of the overhang portion 30 (engagement portion 35). In FIG. 4A, a part of the vent nozzle 7 is not shown.

  The positioning nut 20 is a metal jig for positioning the vent nozzle 7 on the mold body 2 and is fixed to the flange portion 12 of the vent collar 5 with bolts (not shown). More specifically, as shown in the plan view of FIG. 2A, the positioning nut 20 has a flat cylindrical shape or disk shape, and has a vent nozzle hole 21 (passing opening) and a bolt. A hole 24 is provided. The vent nozzle hole 21 (passage opening) includes a tube body hole 22 and an overhanging portion hole 23, and the tube body hole 22 and the overhanging portion hole 23 are respectively the tube body 29 of the vent nozzle 7. And the overhang | projection part 30 (engagement part 35) is a shape which substantially corresponds in planar view. That is, the overhang portion 30 (engagement portion 35) can pass through the overhang portion hole 23 only when the overhang portion 30 (engagement portion 35) substantially matches the overhang portion hole 23. . When the overhang portion 30 (engagement portion 35) substantially coincides with the overhang portion hole 23 in a plan view, the overhang portion 30 (engagement portion 35) is in a “predetermined rotational posture”.

  As shown in FIG. 2C, two engaged portions 41 are provided inside the positioning nut 20. As shown in FIGS. 2B and 2C, the engaged portion 41 is a portion that engages with the overhanging portion 30 (engaging portion 35) of the vent nozzle 7, and includes an inclined portion 42 and a flat portion. 43 and a ball plunger 44.

  As shown in FIGS. 3A to 3C, the inclined portion 42 is inclined along the circular shape of the positioning nut 20. The inclined portion 42 is for engaging with the overhang portion 30 (engagement portion 35). By rotating the vent nozzle 7 with the inclined portion 42 and the overhang portion 30 (engagement portion 35) in contact with each other, the overhang portion 30 moves toward the flat portion 43 while being in surface contact with the upper surface of the inclined portion 42. To do. As a result, the inclined portion 42 generates a propulsive force to propel the vent nozzle 7 in the axial direction of the vent nozzle insertion hole 6. In this process, since the overhanging portion 30 can move only in a limited region from the thinnest portion of the inclined portion 42 to the end of the flat portion 43, the vent nozzle 7 rotates only at a certain rotation angle. Is possible.

  The flat portion 43 is a portion for locking the overhang portion 30 (engagement portion 35) that has risen up the inclined portion 42.

  The ball plunger 44 is a metal sphere that is fitted into the ball plunger hole 31 of the overhang portion 30 (engagement portion 35) to fix the vent nozzle 7. As shown in FIG. It is energized.

  In addition, inside the positioning nut 20, as shown to Fig.3 (a)-(c), the space | gap part 40 exists. The gap portion 40 is a space into which the overhang portion 30 (engagement portion 35) is inserted.

  Next, a molding method of the resin molded product 61 using the molding die 1 of the present embodiment will be described.

  First, a method for positioning the vent nozzle 7 in the mold body 2 will be described with reference to the perspective views of FIGS. 4 (a) to 4 (c). Part of the vent nozzle 7 shown in FIGS. 4A to 4C is omitted.

  As shown in FIG. 4A, as shown in FIG. 4A, the tube main body 29 and the overhang portion 30 (engagement portion 35) of the vent nozzle 7 are respectively connected to the tube body hole 22 and the overhang portion hole of the positioning nut 20. 23, when the vent nozzle 7 is arranged on the positioning nut 20 so as to substantially match with the plan view, the protruding portion 30 (engaging portion 35) can pass through the protruding portion hole 23 "predetermined rotation". "Attitude".

  As shown in FIG. 4B, when the overhanging portion 30 (engaging portion 35) is passed through the overhanging portion hole 23 as shown in FIG. 4B, the overhanging portion 30 (engaging portion 35) becomes the positioning nut. 20 gaps 40 are inserted.

  4C, when the handle 16 of the vent nozzle 7 is rotated 90 degrees counterclockwise in the horizontal direction, the inclined portion 42 of the positioning nut 20 and the overhang portion of the vent nozzle 7 are obtained. 30 (engagement part 35), the vent nozzle 7 rotates while both are in contact. At this time, the inclined portion 42 generates a propulsive force and propels the vent nozzle 7 in the axial direction of the positioning nut 20 while the vent nozzle 7 and the positioning nut 20 press each other. As a result, the overhang portion 30 (engagement portion 35) is propelled to the flat portion 43, and the ball plunger 44 of the positioning nut 20 is fitted into the ball plunger hole 31 of the overhang portion 30 (engagement portion 35). And locked (fixed).

  As described above, when the vent nozzle 7 is fitted to the positioning nut 20 and rotated in the procedure of Step 1 to Step 3, the protruding portion 30 is positioned on the positioning nut 20. Accordingly, the tube main body 29 of the vent nozzle 7 can also be positioned in the vent nozzle insertion hole 6 of the vent collar 5.

  Next, a method for injecting the resin 60 will be described. As shown in the sectional view of FIG. 1, the resin 60 is injected into the molding cavity 10 with the vent nozzle 7 positioned in the mold body 2. At this time, the resin is injected from the vent nozzle 7 until the resin 60 overflows. Thereafter, when the molding die 1 is heated at a predetermined temperature for a predetermined time, the filled resin 60 is cured, and the resin 60 filled in the molding cavity 10 becomes a resin molded product 61. At this time, since the vent nozzle 7 is inserted and positioned in the vent nozzle insertion hole 6 without a gap, the resin 60 does not enter and adhere to the vent collar 5. Therefore, the resin molded product 61 can be easily removed from the molding die 1.

  As described above, according to the molding die 1 according to the embodiment of the present invention, it is easy to position the vent nozzle 7 on the die body 2.

  Moreover, according to the molding method of the resin molded product 61 according to the embodiment of the present invention, since the resin 60 does not enter and adhere to the bent collar 5, the resin molded product 61 can be efficiently manufactured.

1 Molding die 2 Mold body 6 Vent nozzle insertion hole 7 Vent nozzle 21 Vent nozzle hole (through opening)
30 Overhang portion 35 Engagement portion 40 Gap portion 41 Engagement portion 42 Inclined portion 61 Resin molded product

Claims (2)

In a molding die having a mold body having a molding cavity and a vent nozzle for extracting air from the molding cavity, and provided with a vent nozzle insertion hole for inserting the vent nozzle into the mold body,
A protruding portion is provided in a part of the vent nozzle, and the protruding portion has an engaging portion.
The mold body has a gap where the overhang is inserted,
Between the gap and the outside is provided a passage opening that can pass when the overhanging portion is in a predetermined rotational posture,
An engaged portion that engages with the engaging portion is provided in the gap,
One or both of the engaging part and the engaged part have an inclined part,
The vent nozzle is inserted into the vent nozzle insertion hole and the overhanging portion is in the gap, and can rotate only at a certain rotation angle in a state where the engaging portion and the engaged portion are in contact with each other.
A molding die, wherein the inclined nozzle generates a propulsive force by rotating the vent nozzle in the above-described state to propel the vent nozzle in the axial direction of the vent nozzle insertion hole.   A method for molding a resin molded product, comprising molding a resin molded product using the molding die according to claim 1.

Images