JP2010131899A - Resin molding die for blow molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding die for blow molding, capable of obtaining inexpensively a blow molding product by a reduced manufacturing number in a short time, with a satisfactory finish state. <P>SOLUTION: A product molding part 2 and a molding die body 10 adjacent to an outer circumferential side of the product molding part 2 are integrally molded by photo-molding of curing a photocurable liquid resin by light irradiation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mold for blow molding, and more particularly to a mold for performing product molding in blow molding.

  Patent Document 1 describes a blow molding method. In the blow molding method described in Patent Document 1, the parison 22 is molded into a predetermined shape using a male mold 24 and a female mold 26. (Each symbol is described in the publication.)

JP-A-8-290465 (paragraph [0010], FIG. 1-9)

When a product is manufactured by blow molding using a metal mold, depending on the product, the cost and time required for the manufacture become large.
In other words, the prototype may be manufactured by blow molding, which is the same manufacturing method as the main product, so that the prototype has the same material characteristics as the main product. In the case of a product with a small production quantity such as a prototype, if a metal mold for blow molding is produced, it takes a lot of cost and time to produce the metal mold, so the unit price of the product is remarkably high and the product is obtained. It takes a lot of time.

  An object of the present invention is to provide a blow molding die that can obtain a blow molded product with a small number of productions, such as a prototype, at a low cost in a short time and in a better finished state.

  The first aspect of the present invention is a blow molding resin mold in which a product molded portion and a mold main body connected to the outer peripheral side of the product molded portion are integrally molded by optical modeling for curing a photocurable liquid resin by light irradiation.

According to the configuration of the first aspect of the present invention, since it is a blow molding resin mold manufactured by a manufacturing method in which a photocurable liquid resin is cured by light irradiation, if this mold is used, the heat resistance of the mold is reduced. Although the product quantity that can be manufactured from the surface is smaller than the product quantity when using a metal mold, the mold price is reduced by preparing the mold with less production cost and production time than when using a metal mold. The product can be blow-molded with the production lead time reduced.
According to the configuration of the first aspect of the present invention, since it is a resin mold manufactured for use in blow molding, the molding reaction force applied to the product molding section and the mold body becomes a relatively small reaction force, thereby forming the product. The resin thickness of the part and the mold body is relatively thin. From this aspect, the mold is prepared with reduced production costs and production time, and the product unit price is reduced, and the production lead time is shortened. Can be blow molded.

For example, when manufacturing a fuel tank, a cap port installed in a mold may be integrated with a fuel tank to be blow molded. When performing such insert molding, according to the configuration of the first invention, it is possible to obtain good integration between the insert product and the parison.
In other words, according to the configuration of the first invention, since the product molding part is made of resin by stereolithography, rapid heat transfer from the parison to the product molding part can be prevented, and the parison insert can be prevented by preventing rapid cooling of the parison. The wrapping around the product can be performed with high accuracy.

  Therefore, it can be obtained at a low cost and in a short time to obtain a blow molded product with a small number of production such as a prototype. Even in the case of insert molding, it is possible to obtain a product with a good finished state in which the parison has wrapped around the insert product with high accuracy.

  In the second aspect of the present invention, a cooling water tank part for storing cooling water that cools the product molding part is provided on the back side of the product molding part.

  The second invention has the following functions and effects in addition to the functions and effects of the configuration of the first invention.

  According to the configuration of the second aspect of the present invention, if cooling water is supplied to the cooling water tank, the cooling water is allowed to act on the back side of the product molding portion over a wide range, and blow molding is performed while effectively cooling the product molding portion. Can do.

  Therefore, a resin mold for blow molding having excellent durability can be obtained so that a large number of products can be blow-molded as much as possible by effectively cooling the product molding portion while being a resin mold by optical modeling.

  According to the third aspect of the present invention, a partition wall section that partitions the cooling water tank section into an upstream water tank section in which a cooling water supply port exists and a downstream water tank section in which a cooling water discharge port exists is provided on the rear surface of the product molding section. It is provided on the side.

  The third invention has the following functions and effects in addition to the functions and effects of the configuration of the second invention.

  According to the configuration of the third aspect of the invention, if the cooling water is supplied to the cooling water supply port, the cooling water flows into the upstream water tank part and flows to the side opposite to the cooling water supply port side. Then, the cooling water that has flowed through the upstream water tank portion flows into the downstream water tank portion, flows through this downstream water tank portion toward the cooling water discharge port side, and the cooling water that flows through the downstream water tank portion passes through the cooling water discharge port. It is possible to suppress the generation of the cooling water that goes out of the cooling water tank part and remains in the cooling water tank part, thereby cooling the product forming part more effectively.

  Therefore, it is possible to obtain a resin mold for blow molding that is extremely excellent in durability so that more product can be blow-molded by cooling the product molding portion more effectively while being a resin mold by optical modeling. .

  In the fourth aspect of the present invention, a cooling water tank section for storing cooling water that cools the mold body is provided on the back side of the mold body.

  The fourth aspect of the invention has the following operational effects in addition to the operational effects of the configuration of the first aspect of the invention.

  According to the configuration of the fourth aspect of the present invention, if cooling water is supplied to the cooling water tank, the cooling water can act on the back side of the mold body over a wide range, and blow molding can be performed while effectively cooling the mold body. .

  Therefore, it is possible to obtain a resin mold for blow molding having excellent durability so that as many products as possible can be blow-molded by effective cooling of the mold body while being a resin-made mold by optical modeling. .

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a blow molding resin mold 1 according to an embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the blow molding resin mold 1 according to the embodiment of the present invention as seen from the back side. 3 is a cross-sectional view taken along the line III-III in FIG. In FIGS. 1, 2, and 3, the blow-molding resin mold 1 is illustrated in a state in which the vertical direction is in the horizontal direction. As shown in these drawings, a resin mold 1 for blow molding according to an embodiment of the present invention is connected to a product molding portion 2 having a molding cavity 3 and a dividing wall portion 11 on the outer peripheral side of the product molding portion 2. The mold main body 10 and a cooling water tank section 20 provided over the back side of the product molding part 2 and the back side of the mold main body 10 are provided.

  5 and 6 are longitudinal side views of the blow molding apparatus 30 to which a pair of blow molding resin molds 1 according to the embodiment of the present invention are mounted. 7 is a cross-sectional view taken along the line VII-VII in FIG. As shown in these drawings, this blow molding apparatus 30 includes a fixed side mounting plate 31 to which one of a pair of blow molding resin dies 1 and 1 is attached, and the other of a pair of blow molding resin plates 1 and 1. The mounted movable side mounting plate 32, the mold clamping cylinder 33 linked to the movable side mounting plate 32, the die 34 disposed between the fixed side mounting plate 31 and the movable side mounting plate 32, and each blow molding A cooling water supply hose 35 and a cooling water discharge hose 36 connected to the resin molds 1 and 1 are provided.

  The blow molding apparatus 30 extrudes molten resin from an annular resin passage (not shown) of a die 34 between a pair of blow molding resin molds 1 and 1 that are opened by a mold clamping cylinder 33. The parison 40P is formed, and air is blown into the parison 40P from the blow pin 34a of the die 34 to supply the parison 40P. When the parison 40P expands, the movable side mounting plate 32 is fixed along the guide rail 37 by the mold clamping cylinder 33. The pair of blow molding resin molds 1 and 1 are closed by moving to the side mounting plate 31 and the parison 40P is molded by the pair of blow molding resin molds 1 and 1 in the closed state, so that the fuel tank is removed. Make it.

  When the parison 40P is molded, the blow molding device 30 supplies cooling water to the cooling water tank portion 20 of each blow molding resin mold 1 by the cooling water supply hose 35, and the cooling water tank of each blow molding resin mold 1 is used. Cooling water is discharged from the part 20 by the cooling water discharge hose 36, and a fuel tank is produced while cooling each blow molding resin mold 1.

  FIG. 8 is a perspective view of the fuel tank 40 manufactured by the blow molding resin mold 1. FIG. 9 is a side view of the fuel tank 40 produced by the blow molding resin mold 1. As shown in these drawings, the fuel tank 40 produced by the blow shaping resin mold 1 includes a bottom wall 41 bent in the vertical direction of the tank in a side view of the tank and a flat upper wall 42. is there. The fuel tank 40 is equipped in the rice transplanter to store engine fuel.

  The fuel tank 40 has a shape in which the length in the front-rear direction of the tank is greater than the length in the lateral direction of the tank, and the height on one end side in the tank front-rear direction is greater than the height on the other end side. ing. The fuel tank 40 includes a parting line 44 positioned along the side wall 43 between the bottom wall 41 and the top wall 42, a fuel supply cap port 45 provided on the top wall 42, and a bottom wall 41. And a take-out port 46.

  The parting line 44 includes a horizontal line portion 44a positioned on both ends in the tank front-rear direction and an inclined line portion 44b positioned between the horizontal line portions 44a on both ends.

  The cap port 45 and the take-out port 46 are provided by insert molding that is mounted inside the blow molding resin mold 1 and integrated with the top wall 42 or the bottom wall 41 when the fuel tank 40 is blow molded. ing.

  That is, as shown in FIGS. 1, 2, and 3, the product molding portion 2 of the resin mold 1 for blow molding includes a bottom wall molding wall 4 and a side wall molding wall 5 connected to the periphery of the bottom wall molding wall 4. The molding cavity 3 is formed by the bottom wall molding wall 4 and the side wall molding wall 5.

  One of the molding cavities 3 of the pair of blow molding resin molds 1, 1 has a shape corresponding to a portion (bottom side portion) located on the bottom side of the parting line 44 of the fuel tank 40, and a pair of blow molds The other molding cavity 3 of the molding resin molds 1, 1 has a shape corresponding to a portion (upper portion) located above the parting line 44 of the fuel tank 40. One blow molding resin mold product molding portion 2 includes a takeout port mounting portion 7 provided on the bottom wall molding wall 4.

  Therefore, the product molding portion 2 causes the parison 40P to enter the molding cavity 3, and the parison 40P is molded to the bottom side portion or the upper side portion of the fuel tank 40 by the bottom wall molding wall 4 and the side wall molding wall 5.

  As shown in FIGS. 2 and 3, the product molding portion 2 includes a resin mold sideways gas vent passage 6 provided on the back side of the bottom wall forming wall 4 so as to be arranged in the vertical direction of the resin mold.

  As shown in FIGS. 1, 2, and 3, the mold body 10 of each blow molding resin mold 1 includes the divided wall portion 11, and further includes a frame body portion 12 connected to the outer peripheral side of the divided wall portion 11. A parting surface 13 (divided surface) is formed by the front side surface of the dividing wall portion 11, and the product molding portion 2 is accommodated by the frame body portion 12.

  The mold body 10 includes a parting line groove 14 provided on the parting surface 13 along the outer periphery of the opening of the molding cavity 3, and the parting line groove 14 extends along the outer peripheral side of the parting line groove 14. A seal protrusion 16 projecting from the surface 13 is provided, and an attachment flange 17 is provided continuously to the resin mold back side end of the frame body portion 12.

  The mounting flange 17 includes bolt holes 17a provided side by side in the circumferential direction of the resin mold 1 for blow molding, and the fixed-side mounting plate 31 or the movable-side mounting plate by a connecting bolt mounted in each bolt hole 17a. 32.

  The mold body 10 includes guide protrusions 18 and positioning recesses 19 that are provided in a distributed manner at both corners of the frame body 12 on the upper side of the resin mold and both corners of the lower side of the resin mold. One of the pair of blow molding resin molds 1, 1 is provided with guide protrusions 18 at the corners on the resin mold upper side of the frame body part 12, and positioning recesses 19 at the corners on the resin mold lower side of the frame body part 12. In the other of the pair of blow molding resin molds 1, 1, guide protrusions 18 are provided at corners on the resin mold lower side of the frame body part 12, and positioning recesses 19 are provided at corners on the resin mold upper side of the frame body part 12. Prepare for the department.

  Therefore, the blow molding resin mold 1 is attached to the fixed side mounting plate 31 or the movable side mounting plate 32 by the mounting flange 17, and in the mounted state, the opening of the cooling water tank section 20 is fixed side mounting plate 31. Or it will be in the state closed by the movable side attachment board 32. FIG.

  When the blow molding resin mold 1 is closed, the guide protrusions 18 engage with the positioning recesses of the other blow molding resin mold, and the other blow molding resin molds enter the positioning recesses 19. By engaging the guide protrusion, the guide protrusion is properly aligned with the other blow molding resin mold 1, and the parting surface of the other blow molding resin mold 1 is Oppositely, the parting surfaces 13 are sealed by the sealing protrusions 16, and the product molding part 2 is appropriately opposed to the product molding part of the other blow molding resin mold 1. .

  As shown in FIGS. 1, 2, and 5, the cooling water tank portion 20 of the blow molding resin mold 1 is arranged so as to communicate with a portion near the upper end of the cooling water tank portion 20, and is provided in the frame body portion 12. An outlet 21 and a cooling water discharge port 22 provided in the frame body portion 12 so as to communicate with a portion near the upper end of the cooling water tank portion 20 are provided. As shown in FIG. 1, in each blow molding resin mold 1, the cooling water supply port 21 and the cooling water discharge port 22 are blow molding resin in a state where the blow molding resin mold 1 is attached to the blow molding device 30. Located on the upper end side of the mold 1.

  The cooling water tank section 20 includes the cooling water supply port 21 by a partition wall section 23 formed of a plate-shaped reinforcing rib that is vertically oriented on the resin mold and is provided across the back surface side of the product molding section 2 and the back surface side of the mold body 10. Is divided into an upstream water tank section 24 and a downstream water tank section 25 in which the cooling water discharge port 22 is present. The cooling water tank section 20 includes a communication hole 26 provided at an end of the partition wall section 23 on the resin mold lower side, and the communication hole 26 communicates the bottoms of the upstream water tank section 24 and the downstream water tank section 25 with each other. I am letting.

  Accordingly, the cooling water tank section 20 is connected to the cooling water supply port 21 by connecting the cooling water supply hose 35 to be supplied with cooling water, and the cooling water discharge port 22 is connected to the cooling water discharge hose 36 by Cooling water flows into the upstream water tank unit 24 for storage, and cooling water that flows into the upstream water tank unit 24 flows into the downstream water tank unit 25 through the communication hole 26 for storage, and the upstream water tank unit 24 and downstream The product molding part 2 and the mold body 10 are cooled by the cooling water in the side water tank part 25, and the cooling water whose temperature has risen due to the cooling action flows from the cooling water discharge port 22 to the cooling water discharge hose 36 due to the overflow in the downstream water tank part 25. Let it flow out and discharge it outside the cooling water tank.

  FIG. 4 is a cross-sectional view of the blow molding resin mold 1 at the seal ridge arrangement portion. As shown in FIG. 3 and FIG. 3, the cooling water tank section 20 includes a cooling recess 27 provided along the seal protrusion 16 on the back side of the seal protrusion 16, and cooling water is supplied to the cooling recess 27. It is made to flow in and cooling of the seal protrusion 16 is performed effectively.

  FIG. 10 is a schematic view showing a method for producing the blow molding resin mold 1. As shown in this figure, the blow molding resin mold 1 is manufactured by integrally molding the product molding portion 2 and the mold body 10 to a thickness of 6 to 8 mm by optical modeling with an optical modeling apparatus 50. Yes.

  That is, the optical modeling apparatus 50 includes a modeling tank 51, a lifting platform 52 installed in the modeling tank 51 so as to be movable up and down, a lifting platform driving device 53 linked to the lifting platform 52, and the modeling tank 51. A light irradiation device 54 installed, a control device 55 linked to the light irradiation device 54 and the lifting platform driving device 53, and a three-dimensional CAD system 56 (computer-aided design system) linked to the control device 55 are provided. Yes.

  In other words, the cross-sectional shape data of the blow mold resin mold 1 is created by the three-dimensional CAD system 56, and the elevator drive device 53 and the light irradiation device 54 are operated by the control device 55 that operates based on the cross-sectional shape data. The liquid surface of the photocurable liquid resin A (for example, epoxy-based ultraviolet curable resin) stored in the tank 51 is irradiated with laser ultraviolet light by the light irradiation device 54 to cure the photocurable liquid resin A. When a cured resin layer cured to a shape corresponding to the cross-sectional shape data is formed, the elevator 52 is lowered by the elevator driving device 53, and when the elevator 52 moves down the set stroke, the liquid level of the photocurable liquid resin A The photo-curable liquid resin A is cured by irradiating laser light with a light irradiation device 54, and a cured resin layer cured in a shape corresponding to the new cross-sectional shape data is stacked on the previous cured resin layer. To do. The blow molding resin mold 1 is completed on the lifting platform 52 by repeatedly forming the cured resin layer and stacking the cured resin layers.

[Another Example]
Instead of the photo-molding liquid resin that has been molded by laser molding that irradiates laser ultraviolet light from above, the photo-curable liquid resin is irradiated with laser ultraviolet light from below by a light irradiation device installed below the modeling tank. The present invention can also be applied to a blow molding resin mold provided with a configuration molded by stereolithography. That is, the object of the present invention can be achieved even in a blow molding resin mold formed by any of the top-lighting method and the bottom-lighting method.

  Instead of the cooling configuration of the above-described embodiment, a configuration may be adopted in which the cooling water tank part that cools the product molding part 2 and the cooling water tank part that cools the mold body 10 are provided separately. Can also achieve the object of the present invention.

Perspective view seen from the front side of the resin mold for blow molding Perspective view from the back side of the blow mold resin mold III-III sectional view of FIG. Cross-sectional view of the blow molding resin mold seal ridge Longitudinal side view of blow molding equipment Longitudinal side view of blow molding equipment VII-VII section arrow view of FIG. Perspective view of fuel tank Fuel tank side view Schematic showing how to make a blow mold resin mold

Explanation of symbols

2 Product molding part 10 Mold body 20 Cooling water tank part 21 Cooling water supply port 22 Cooling water discharge port 23 Partition wall part 24 Upstream water tank part 25 Downstream water tank part A Photocurable liquid resin

Claims (4)

  A blow-molding resin die in which a product molding part and a mold body connected to the outer peripheral side of the product molding part are integrally molded by optical modeling for curing a photocurable liquid resin by light irradiation.   The blow mold resin mold according to claim 1, wherein a cooling water tank section for storing cooling water that cools the product molding section is provided on the back side of the product molding section.   A partition wall section that divides the cooling water tank section into an upstream water tank section in which a cooling water supply port exists and a downstream water tank section in which a cooling water discharge port exists is provided on a back surface side of the product forming section. Item 3. A blow mold resin mold according to Item 2.   The blow mold resin mold according to claim 1, wherein a cooling water tank section for storing cooling water that cools the mold body is provided on a back side of the mold body.

Images