JP7333682B1 - METHOD FOR MANUFACTURING RECEIVER MEMBER FOR TRANSPORT CONTAINER AND MOLD USED FOR SAME - Google Patents

Abstract

The present invention provides a mold that is inexpensive to manufacture and can save storage space, a receiving member for a transport container manufactured using the mold, and a method for manufacturing the same. A mold 16 of the present invention has a substantially rectangular parallelepiped shape, and has a base 19 in which a recess 19c is provided on a bottom surface 19b and a first pin 17a and a block 18, and a state in which the mold 16 is fitted into the recess 19c. The base plate 20 is fixed to the base 19 using bolts 21a. The base 19 has a plurality of pin insertion holes 19d that are circular in plan view and are provided perpendicularly to the top surface 19a, and the four corners of the bottom surface 19b are provided with pin insertion holes that are circular in plan view and screw the base 19 into other members. Screw holes 19e used for fastening are provided respectively. Further, the bottom plate 20 is provided with a plurality of through holes 20a that are circular in plan view and are provided at locations that correspond to the pin insertion holes 19d so that bolts 21b inserted into the pin insertion holes 19d of the base 19 can communicate with each other. [Selection diagram] Figure 3

Description

TECHNICAL FIELD The present invention relates to a receiving member for a transporting container (hereinafter simply referred to as a receiving member) for fixing products and parts in a transporting container so that they do not move, a method for manufacturing the same, and a mold used therefor. The present invention relates to a method for inexpensively manufacturing a receiving member which is detachably attached to a member constituting a container.

Containers (hereinafter referred to as transport containers) used for transporting and transporting products and parts (hereinafter collectively referred to as goods) are equipped with receiving members to prevent the goods from being damaged or damaged. It is often done. In some cases, the receiving member is provided with a three-dimensional curved surface along the shape of the article so that the article can be reliably supported. However, when manufacturing a receiving member having such a shape, there is no choice but to produce a wide variety of products in small quantities. Therefore, when it was attempted to manufacture all of these receiving members by injection molding, there was the problem that it would take a great deal of time to create the molds, resulting in increased manufacturing costs.

As a solution to this problem, for example, Patent Document 1 discloses an invention related to a vacuum-formed tray for receiving the lower part of a motor for running a vehicle under the name of "Motor Receiving Tray and Transfer Set". there is
In Patent Document 1, a suction hole provided in a molding die in a state in which a heated synthetic resin plate-shaped member having a plurality of shaped projections is laid on the heated molding die. It is described that the motor receiving tray is manufactured by applying a negative pressure to the inside of the plate-like member so as to form an uneven shape corresponding to the forming protrusions on the plate-like member, and then removing the cooled plate-like member from the forming die. ing.
In the motor receiving tray manufactured in this manner, a three-dimensional curved surface that conforms to the shape of the article is formed by vacuum molding, so the manufacturing cost is lower than when the relevant portion is formed by a method such as injection molding. There is an advantage.

In addition, Patent Document 2 discloses an invention related to a transport container provided with a receiving member for supporting a product under the name of "product transport container".
In Patent Document 2, after a thermoplastic sheet such as polypropylene is heated and softened, a skin member is formed by deforming it under vacuum pressure using a mold having a structure in which the shape of the product is copied to the upper surface of a part of the metal block. It is described that the skin member and the rib plate form the product receiving portion of the transport container.
In the transport container with such a structure, the three-dimensional hollow portion of the product receiving portion that supports the product is formed by vacuum forming, so the manufacturing cost is lower than in the case where the portion is formed by a method such as injection molding. can be made cheaper.

Furthermore, Patent Document 3, titled "Manufacturing Method of Transport Container", relates to a method of manufacturing a transport container with a three-dimensional receiving material, a small number of parts, and easy sorting and disposal in a short delivery time. An invention is disclosed.
The invention disclosed in Patent Document 3 includes a frame having a pedestal unit provided with openings in a pair of vertically spaced side walls, and a frame straddling the pedestal unit and having openings in the pair of side walls. In a method for manufacturing a transport container having receiving members in which claw portions are fitted to an upper frame, a rectangular forming main portion having a flat plate-like rising rib provided in a grid pattern in the plane; A flange portion provided to surround the main portion, and a pair of fitting structure portions provided outside a pair of sides of the forming main portion and bent perpendicularly downward from the flange portion in the vertical direction. a step of forming by injection molding a preform having claw portions respectively formed in the fitting structure portion; On the other hand, it is characterized by having a step of performing vacuum forming and a step of mounting the vacuum formed preform on the base unit as a receiving material.
According to such a transport container manufacturing method, the receiving material is attached to the pedestal unit by the joint shape portion of the preform and the cross beam, so the number of parts forming the transport container is reduced. This also facilitates separate disposal. Further, when the receiving material is formed by stretching the main molding portion vertically by vacuum forming, the main molding portion is prevented from becoming extremely thin due to the resin material being supplied from the ribs to the periphery. . As a result, the strength of the receiving material is improved.

JP 2020-179883 A Japanese Patent No. 7007006 Japanese Patent No. 7215795

Molds used in vacuum molding are processed into desired shapes by cutting metal or resin blocks into three-dimensional shapes, but they are structurally more complex than molds used in injection molding. Because it is less complex, the manufacturing cost is not as high as the molds used for injection molding.
In the motor receiving tray disclosed in Patent Document 1, the transport container disclosed in Patent Document 2, and the transport container disclosed in Patent Document 3, the manufacturing cost of the mold used when performing vacuum forming is reduced by performing injection molding. Although it is cheaper than the mold used for vacuum forming, the part that comes into contact with the product is formed by a three-dimensional curved surface. Since it had to be remade each time, there was a problem that the manufacturing cost of the mold increased. Also, in order to support repeat production, it is necessary to store the manufactured molds for a certain period of time.

SUMMARY OF THE INVENTION The present invention has been made in response to such conventional circumstances. and its manufacturing method.

In order to achieve the above object, a first invention provides a mold for forming a storage article receiving part having a plurality of bar-shaped projections on a part of a flat plate material of thermoplastic resin by vacuum forming, the mold comprising a cylindrical body or a base having a plurality of cylindrical pins, a plurality of pin insertion holes that are circular in plan view and perpendicular to the upper surface, a bottom plate that is installed on the base so as to close the lower ends of the pin insertion holes; The bottom plate is provided with a through hole parallel to the thickness direction at a location corresponding to the pin insertion hole, and the base end of the pin is inserted through the pin insertion hole so that the tip side of the pin protrudes from the upper surface of the base. characterized in that it is fixed in a
In the first invention, by changing the length of the pin protruding from the upper surface of the base, there is an effect that the shape of the article that can be supported by the stored article receiving portion is determined. In addition, if a screw hole or bolt hole is provided at the lower end of the pin, the pin can be pushed through the bottom plate by screwing the tip of a screw or bolt inserted through the through hole of the bottom plate into the screw hole or bolt hole. It has the effect of being fixed to the base.

In a second invention according to the first invention, the pin has a male threaded portion protruding in the longitudinal direction at the upper end, and a female threaded portion screwed with the male threaded portion at the lower end parallel to the longitudinal direction. and a distal end pin having a female screw portion provided at its lower end parallel to the longitudinal direction.
In the second invention, in addition to the effects of the first invention, by reselecting a connecting pin to be combined with the tip pin from among a plurality of connecting pins having different lengths, or by connecting a plurality of connecting pins, It has the effect of easily changing the overall length of the pin.

A third aspect of the invention is based on the second aspect of the invention, provided with a rectangular parallelepiped block instead of the tip pin, and the block has a female screw portion perpendicular to one of a pair of parallel surfaces. characterized by being formed
When the receiving member for a transporting container is manufactured using the third aspect of the invention, the stored item receiving portion has a flat surface perpendicular to the longitudinal direction of the bar-shaped projection by the other of the pair of surfaces parallel to each other. is formed.

A fourth invention is based on the second invention, wherein the contour line of the inner wall surface of the through hole has a circular portion having a diameter smaller than the inner diameter of the pin insertion hole and larger than the inner diameter of the female screw portion; It is characterized by being constituted by a notch provided in a part of the circular part so as to protrude radially outward of the hole.
In the fourth invention, in addition to the effects of the second invention, in order to fix the pin to the base, the tip of the bolt inserted through the through hole of the bottom plate is attached to the female threaded portion provided at the lower end of the pin. When it is screwed in, the air sucked from the top side of the base during vacuum forming is discharged downward from the bottom side of the base through the part of the notch that is not covered by the head of the bolt. have

According to a fifth invention, in the first invention, at least a part of the upper surface side of the base has a rounded quadrangular shape with four rounded corners in a plan view.
When the base is pressed against the preform during vacuum forming, it is recommended that the upper surface of the base is recessed into the lower surface of the preform by a few millimeters in order to adhere the two together. If the corners are shaped like this, there is a risk that cracks will occur where the corners come into contact with the preform. On the other hand, in the fifth invention, since the upper surface of the base has a square shape with rounded corners in a plan view, the above-mentioned cracks are less likely to occur.

A sixth aspect of the invention is a mold for forming an article receiving part having a plurality of bar-shaped projections on a part of a flat plate material made of thermoplastic resin by vacuum forming, the mold having a stepped structure composed of a cylindrical body or a cylindrical body. a plurality of pins, a plurality of stepped pin insertion holes provided perpendicular to the upper surface of the lower die, and a through hole circular in plan view parallel to the thickness direction at a location corresponding to the pin insertion hole and an upper mold that is provided on the upper surface of the lower mold, and the pin insertion hole has a small diameter hole that is circular in plan view and opens to the bottom side, and a large diameter hole that is circular in plan view and opens to the top side. The pin is provided with a small-diameter portion made of a cylindrical body having an outer diameter smaller than the inner diameter of the through-hole of the upper mold on the tip side, and is formed from the inner diameter of the small-diameter hole of the lower mold and the through-hole of the upper mold. A large-diameter portion having a larger outer diameter is provided on the base end side, and the large-diameter portion of the pin has an outer diameter that is smaller than the inner diameter of the large-diameter hole of the lower die, and the depth of the large-diameter hole of the lower die. is characterized by being equal in length to
In the sixth invention, after the large diameter portion of the pin is arranged inside the large diameter hole of the pin insertion hole of the lower mold, the upper mold is placed on the upper surface of the lower mold by allowing the small diameter portion of the pin to pass through the through hole. When they are installed and fixed with bolts or the like, the large-diameter portion of the pin cannot be extracted from the large-diameter hole of the pin insertion hole of the lower mold, and the pin is fixed to the mold.

According to a seventh aspect of the present invention, there is provided a transport container receiving member installed for fixing an article stored in a transport container, wherein a part of a flat plate material made of a thermoplastic resin is provided with a stored article receiving portion, The storage item receiving portion is characterized by having a plurality of bar-shaped projections formed to protrude in one direction.
In the seventh invention, the articles stored in the transport container are supported by the tip end surface of the bar-shaped projection, and the lateral movement of the article is restricted by the side surfaces of the bar-shaped projection coming into contact with the article. have an effect.

A method of manufacturing a receiving member for a transporting container according to an eighth aspect of the invention includes the steps of forming a flat preform by injection molding a thermoplastic resin, and heating a portion of the preform to a heat distortion temperature. forming an article receiving portion in a portion of the preform by performing vacuum forming by pressing the mold according to any one of the first to sixth inventions against the heated portion of the preform; and a step.
In the eighth invention, there is an effect that the carrier container receiving member according to the seventh invention is easily manufactured by vacuum forming using the mold according to any one of the first to sixth inventions. .

According to the first invention, by replacing the pins installed on the base with ones having different lengths or by changing the positions where the pins are installed on the base, the stored goods receiving portion of the receiving member for transporting containers can be changed. Since the shape of the mold can be easily changed, there is an effect that the manufacturing cost can be reduced as compared with the case where the mold is remade from scratch. Also, if you record the length of the pin and the position of the pin insertion hole where the pin is installed, you can easily restore it to its original state at any time, so you can store the base with the pin removed from the pin insertion hole. . This makes it possible to save space for storing molds.
Furthermore, in the first invention, since the lower end of the pin can be fixed to the base through the bottom plate, a flow path for air sucked from the upper surface of the base during vacuum forming can be formed between the pin insertion hole and the pin. is possible. In this case, the manufacturing cost of the mold can be reduced as compared with the case where the channel is provided at a location other than the pin insertion hole in the base or inside the pin.

According to the second invention, since the total length of the pins can be easily changed, in addition to the effects of the first invention, even if the specification of the stored article receiving portion in the receiving member for the transporting container is changed, each pin can be changed. By adjusting the overall length, it is possible to manufacture a receiving member for a transporting container provided with a storage article receiving portion having a bar-like projection of a desired length in a short time and at a low cost.

According to the third invention, it is possible to manufacture a receiving member for a transporting container having a stored article receiving portion having a portion for supporting an article on its surface. This has the effect of increasing the degree of freedom in designing the product receiving portion.

In the fourth invention, since the through-hole of the bottom plate functions as a flow path for the air sucked from the upper surface of the base during vacuum forming, there is no need to process the flow path newly in the bottom plate. Therefore, according to the fourth invention, in addition to the effect of the second invention, the effect of the first invention that the manufacturing cost of the mold is reduced is further exhibited.

According to the fifth aspect of the invention, cracks are less likely to occur in the preform during vacuum forming. Therefore, in addition to the effect of the first aspect, there is an effect that a receiving member for a transporting container can be efficiently manufactured from the preform.

In the sixth invention, since it is not necessary to fix the pins one by one, the time required for setting the pins can be reduced. Therefore, according to the sixth invention, it is possible to improve the efficiency of manufacturing the mold.

In the seventh invention, unlike the prior art in which the article receiving portion supports the article over its entire surface, the contact area between the article and the article receiving portion is small, so that the stored article is less likely to be damaged. . In addition, since there are few restrictions on the shape of the portion of the stored article receiving portion that does not come into contact with the article, it is possible to set the processing accuracy of that portion to be lower than that of other portions. As a result, the manufacturing cost of the vacuum forming mold used to form the stored article receiving portion can be reduced.

According to the eighth invention, the receiving member for transporting containers according to the seventh invention can be efficiently manufactured at a low cost.

1(a) and 1(b) are external perspective views of a receiving member for a transporting container according to an embodiment of the present invention and a preform used for manufacturing the same, respectively. FIG. 1(a) and 1(b) are a schematic diagram showing the configuration of a thermoforming apparatus used for manufacturing the receiving member for transporting containers of the present invention, and a flow chart for explaining the manufacturing method of the receiving member for transporting containers, respectively. (a) is an external perspective view of the mold according to the first embodiment of the present invention, and (b) is a bottom view of the mold shown in (a). (a) is the figure which showed the state which removed the baseplate in FIG.3(b), (b) is a top view of the baseplate shown in FIG.3(b). (a) is a side view of a first pin, a second pin and a block installed in the mold shown in FIG. 3(a), and (b) is a side view of the first pin, the second pin and the block is a cross-sectional view showing a state in which is attached to a mold. (a) is an external perspective view of a mold according to a second embodiment of the present invention, and (b) and (c) are external perspective views of upper and lower molds shown in FIG. is. (a) is a side view of a third pin and a fourth pin, (b) is a bottom view of the mold shown in FIG. 6 (a), and (c) is a third pin. FIG. 10 is a cross-sectional view showing a state in which the pin and the fourth pin are attached to the mold;

A receiving member for a transporting container according to the present invention, a method for manufacturing the same, and a mold used therefor will be specifically described with reference to FIGS. 1 to 7. FIG.
In the following description, as an example of the receiving member for the transporting container, a structure that is installed on a plate member such as a floor plate of the transporting container is taken as an example. The method and mold for manufacturing a receiving member for a transporting container according to the present invention can be similarly applied to the case of manufacturing a structure to be installed on a square pipe forming the frame of the transporting container. That is, even when vacuum forming using the mold of the present invention is performed on the main molding portion of the preform disclosed in Patent Document 3, the receiving member for a transporting container of the present invention and the manufacturing method thereof will be described below. and the action and effect of the mold used therefor are exhibited in the same manner.
In addition, in the specification of the present application, expressions such as "upper surface" and "lower surface" are used with respect to the receiving member for transporting containers and the mold used for manufacturing the same, assuming the state in which they are actually used.

1(a) and 1(b) are external perspective views of a receiving member for a transporting container (hereinafter referred to as receiving member 1) according to an embodiment of the present invention and a preform 13 used for manufacturing the same, respectively. . 1(a) shows the receiving member 1 viewed from the second surface 13b side, and FIG. 1(b) shows the preform 13 viewed from the first surface 13a side.
The preform 13 is formed by injection molding of a thermoplastic resin such as polyester, polyolefin, polyamide, polycarbonate, or the like, and is made of a plate material having a substantially rectangular shape in plan view. ) is formed, and a boundary portion 3 (FIG. 1(a) ), and a first coupling portion 4 and a second coupling portion 10 provided outside the boundary portion 3 and having side surfaces 13c and 13d corresponding to the two parallel sides forming the above-described rectangle, respectively. I have it. The first surface 13a of the preform 13 is thickened by providing a boundary portion 3 (see FIG. 1(a)) on the second surface 13b (see FIG. 1(a)). Recesses 3a, 3a each having a rectangular shape in a plan view are provided symmetrically with respect to a portion corresponding to the part so as to sandwich the part to be molded 2 therebetween.
In the receiving member 1, a minute circular recess 1b is formed in a portion of the part to be molded 2 where the article receiving part 1a is not formed. It is formed by sucking air between the surface 13a and the mold, and can be made inconspicuous by adjusting the height of the second pin 17b. Further, by setting the second pin 17b higher than the upper surface 19a of the base 19 and providing a circular convex portion, the strength of the molding target portion 2 can be increased and distortion can be prevented.

The first coupling portion 4 is composed of a seat plate 4a having a rectangular shape in a plan view, a projecting portion 5 and protrusions 6 and 7 provided on a first surface 13a of the seat plate 4a. 4a is provided with circular through holes 8a near side surfaces 13e and 13f perpendicular to the side surfaces 13c and 13d, respectively. The projecting portion 5 connects a pair of side plates 5a, 5a perpendicular to the seat plate 4a and parallel to the side surface 13c, and the upper end sides of the pair of side plates 5a, 5a, and is flat. A top plate 5c parallel to the first surface 13a, a pair of side plates 5b, 5b perpendicular to the seat plate 4a and connecting the top plate 5c and the pair of side plates 5a, 5a, and a side plate A pair of side plates 5a, 5a are installed parallel to 5b and configured by four reinforcing plates 5d connecting the pair of side plates 5a, 5a. 9, 9 are provided.
In the opening 9, a part of the inner wall surface corresponding to one of the long sides of the rectangle when viewed from above is cut away, so that the pair of locking portions 9a and 9a are positioned farther from the molding target portion 2. formed. Moreover, the upper surface plate 5c of the projecting portion 5 is provided with projecting portions 6 at both ends in the longitudinal direction, respectively, and a projecting portion 7 is provided substantially in the center.

The seat plate 10a of the second coupling portion 10 is provided with circular through holes 8b near the side surfaces 13e and 13f, respectively. A pair of locking pieces 11b, 11b projecting in a direction perpendicular to the side surface 13d and having a rectangular shape in a plan view, and divided into two by the slit 11a, extend in the width direction of the seat plate 10a (side surface 13e). , 13f). A pair of slits 10b, 10b having a predetermined length in a direction perpendicular to the side surface 13d are formed in the seat plate 10a of the second coupling portion 10 so as to sandwich a pair of engaging claws 12, 12 therebetween. It is provided between the pair of through holes 8b, 8b.

As shown in FIG. 1(a), the structure of the receiving member 1 is the same as that of the preform 13 except that it has an article receiving portion 1a. Therefore, when the receiving member 1 and the preform 13 are connected, the projections 6 of the preform 13 contact the side surfaces 13 d of the receiving member 1 , and the projections 6 of the receiving member 1 contact the side surfaces 13 d of the preform 13 .
That is, the receiving member 1 and the preform 13 have a structure in which the movement in the direction perpendicular to the side surface 13d is mutually restricted by the projections 6 coming into contact with the side surface 13d.

The upper surface plate 5c of the protruding portion 5 has a straight portion parallel to the longitudinal direction, and three protruding portions provided perpendicular to the longitudinal direction at both ends and approximately the center of the straight portion. A protruding portion 7 consisting of is formed. Then, as described above, when the receiving member 1 and the preform 13 are connected, the projecting portion provided substantially in the center of the linear portion of the projecting portion 7 on the other side is arranged inside the one slit 11a, One locking piece 11b is arranged between the end of the straight portion and two protruding portions provided substantially at the center of the other protrusion 7, respectively.
That is, the receiving member 1 and the preform 13 are arranged so that the locking piece 11b on one side of the protrusion 7 on the other side is arranged between the end of the linear portion and the two projecting portions provided substantially in the center. The structure is such that the movement in the direction parallel to and in the direction perpendicular to the side surface 13d is mutually regulated.

The receiving member 1 and the preform 13 are inserted into the opening 9 of the projecting portion 5 through a through hole provided in the plate with the first surface 13a facing the plate such as the bottom plate of the transport container. By engaging the engaging claws 12, it is fixed to both sides of the plate.
However, in the receiving member 1 and the preform 13, since the opening 9 of the projecting portion 5 and the engaging claw 12 are provided symmetrically with respect to the molding target portion 2, one engaging claw 12 When engaging with the opening 9 of the projecting portion 5, the other engaging claw 12 is also engaged with the opening 9 of the projecting portion 5 at the same time. That is, the preform 13 has a structure that can be easily attached to a plate member such as the bottom plate of the transport container by combining it with the receiving member 1 manufactured therefrom.

As shown in FIG. 1(a), the article receiving portion 1a of the receiving member 1 has a plurality of bar-like protrusions 1c formed to protrude in one direction. Therefore, when the receiving member 1 is installed inside the conveying container, the stored article is supported by the tip surface of the rod-shaped projection 1c, or the side surface of the rod-shaped projection 1c comes into contact with the article, thereby causing the article to move in the horizontal direction. movement is restricted.
As described above, in the receiving member 1, unlike the case of the prior art in which the stored article receiving portion 1a supports the article over the entire surface, the contact area between the article and the stored article receiving portion 1a is small. is unlikely to occur. In addition, since there are few restrictions on the shape of the portion of the stored article receiving portion 1a that does not come into contact with the article, the processing accuracy of that portion can be set lower than that of the other portions. Therefore, according to the receiving member 1 having the structure described above, it is possible to reduce the manufacturing cost of the vacuum forming mold used to form the stored article receiving portion 1a.

Here, a method for manufacturing the receiving member 1 will be described with reference to FIG. 2(a) and 2(b) are a schematic diagram showing the configuration of a thermoforming apparatus 14 used for manufacturing the receiving member 1 and a flow chart for explaining the manufacturing method of the receiving member 1, respectively.
The thermoforming apparatus 14 is equipped with a heating booth and a clamping device (not shown), as well as a plug 15 and a mold 16, as shown in FIG. 2(a). The plug 15 is a member for pressing the molding target part 2 from above to bring the molding target part 2 into close contact with the mold 16, and is fixed to the thermoforming device 14 using a fastener so as to be substantially horizontal. It is arranged above the preform 13 that has been formed. On the other hand, the mold 16 is provided with a plurality of first pins 17a installed so as to protrude upward, and is arranged below the preform 13. As shown in FIG.
Note that the plug 15 may not be used in some cases.

As shown in FIG. 2B, first, a substantially rectangular preform 13 is formed by injection molding of thermoplastic resin (step S1). Next, the preform 13 is placed in a heating booth (not shown) of the thermoforming device 14, and the molding target portion 2 is heated until it reaches a predetermined thermal deformation temperature (step S2). Then, after the heated preform 13 is placed in the thermoforming device 14, the first surface 13a (FIG. (b)) is pressed from below, and the plug 15 is pressed from above against the second surface 13b (see FIG. 1(a)) of the part to be molded 2 (step S3). Finally, after sufficiently cooling the preform 13, it is removed from the thermoforming apparatus 14 (step S4).
According to such a method, the receiving member 1 can be easily manufactured by vacuum forming using the mold 16, so that the manufacturing cost of the receiving member 1 can be reduced and the manufacturing efficiency can be improved.

Next, a mold used when manufacturing the receiving member 1 from the preform 13 will be described with reference to FIGS. 3 to 5. FIG. FIG. 3(a) is an external perspective view of the mold 16 according to the first embodiment of the present invention, and FIG. 3(b) is a view of the mold 16 of FIG. 3(a) viewed from the bottom side. be. 4(a) is a diagram showing a state in which the bottom plate 20 is removed in FIG. 3(b), and FIG. 4(b) is a plan view of the bottom plate 20 shown in FIG. 3(b).
3(a) and 3(b) and FIGS. 4(a) and 4(b), only some of the pin insertion holes and through holes are shown in order to avoid complication of the drawings. A sign is attached.

As shown in FIGS. 3(a) and 3(b), the aluminum mold 16 has a substantially rectangular parallelepiped shape, and has a bottom surface 19b with a recess 19c and a first pin 17a and a second pin 17b. (Refer to FIG. 5(a).) It consists of a base 19 on which a block 18 is installed and a bottom plate 20 which is fixed to the base 19 by means of bolts 21a while being fitted in recesses 19c. The base 19 is provided with a plurality of pin insertion holes 19d which are circular in plan view and perpendicular to the upper surface 19a. are provided with screw holes 19e used for screwing the .
On the other hand, in the bottom plate 20, a plurality of through holes 20a which are circular in plan view and extend parallel to the thickness direction at locations corresponding to the pin insertion holes 19d so that the bolts 21b inserted through the pin insertion holes 19d of the base 19 can be communicated. is provided.

When vacuum forming is performed using the mold 16, in order to bring the base 19 into close contact with the preform 13 when the base 19 is pressed against the preform 13, the first surface 13a (see FIG. 2A) of the preform 13 is pressed against the first surface 13a (see FIG. The upper surface 19a of the base 19 should be recessed by several millimeters. There is a risk of On the other hand, the base 19 has at least a portion of the upper surface 19a side in plan view and has a rounded quadrangular shape with four rounded corners (see FIG. 3A). Therefore, the mold 16 is less susceptible to cracks during vacuum forming. Therefore, the mold 16 can efficiently manufacture the receiving member 1 from the preform 13 .

As shown in FIG. 4(a), the base 19 has a circular shape in plan view, and bolt holes 19f for fixing the bottom plate 20 with bolts 21a are provided at four locations in the recess 19c near the screw holes 19e. there is
As shown in FIG. 4(b), the contour line of the inner wall surface of the through hole 20a is smaller than the inner diameter of the pin insertion hole 19d in plan view, and the female screw portion 23b (see FIG. 5(a)) is smaller than the inner diameter of the pin insertion hole 19d. ), and a pair of notches 22b provided at locations corresponding to both ends of the diameter of the circular portion 22a so as to protrude outward in the radial direction of the pin insertion hole 19d. , 22b. In addition, the number of the notch part 22b may be one.
Also, the bottom plate 20 is provided with a notch 20b at a position corresponding to the bolt hole 19f when fitted into the recess 19c of the base 19. As shown in FIG.
The bolt 21b used in the bottom plate 20 having the structure described above has a head portion sized such that at least a portion of the pair of notches 22b, 22b is exposed when the bolt 21b is inserted into the through hole 20a. is desirable (see FIG. 3(b)).

FIG. 5(a) is a side view of the first pin 17a, the second pin 17b and the block 18 installed in the mold 16 shown in FIG. 3(a), and FIG. 4 is a cross-sectional view showing a state in which a pin 17a, a second pin 17b and a block 18 are attached to a mold 16; FIG. FIG. 5(b) shows a state in which the die 16, the first pin 17a, the second pin 17b and the block 18 are cut by a plane passing through the central axis of the pin insertion hole 19d. Moreover, in FIG. 5(b), in order to avoid complication of the drawing, the male threaded portion 23a and the female threaded portion 23b of the connecting pin 23, the female threaded portion 24a of the tip pin 24, the female threaded portion 18a of the block 18 and the Regarding the through holes 20a of the bottom plate 20, only some of them are denoted by reference numerals, and only one first pin 17a is attached with a bolt 21b. 2 pin 17b, bolt 21b is omitted.

As shown in FIGS. 5(a) and 5(b), the first pin 17a is composed of a connecting pin 23 and a tip pin 24. As shown in FIG. The connecting pin 23 is formed of a cylindrical body with a male threaded portion 23a protruding in the longitudinal direction at its distal end, and has a female threaded portion 23a screwed to the male threaded portion 23a of the bolt 21b or another connecting pin 23 at its proximal end. A screw portion 23b is provided parallel to the longitudinal direction. The tip pin 24 is formed of a cylindrical body having a female threaded portion 24a that is screwed with the bolt 21b or the male threaded portion 23a of the connecting pin 23 in parallel with the longitudinal direction. There are two types, one in which a flat surface perpendicular to the longitudinal direction is provided at the tip. The second pin 17b has a length equal to the depth of the pin insertion hole 19d. It has a structure that can be installed inside the pin insertion hole 19d for the purpose of blocking the hole 19d.
The connecting pin 23 and the tip pin 24 are not limited to cylindrical bodies, and may be cylindrical bodies, prismatic bodies, or rectangular cylindrical bodies. However, if the tip pin 24 is a prismatic body or a rectangular cylinder, there is a risk that cracks will occur in the molding target portion 2 of the preform 13 that contacts the corners of the tip surface of the tip pin 24 during vacuum forming. is preferably cylindrical or cylindrical.

The first pin 17a having the above structure can easily change its overall length by using different lengths of the connecting pins 23 to be combined with the tip pin 24, or by combining a plurality of connecting pins 23, and the tip pin 24 It has the effect of easily changing the shape of the tip by changing the type of the tip. Therefore, according to the mold 16 having such first pins 17a, even if the specification of the stored article receiving portion 1a of the receiving member 1 is changed, the total length of each of the first pins 17a can be adjusted. Thus, it is possible to manufacture the receiving member 1 having the stored article receiving portion 1a having the desired length of the rod-like projection 1c (see FIG. 1(a)) in a short period of time and at a low cost.

The block 18 has a pair of female threaded portions 18a, 18a that screw together with the male threaded portion 23a of the connecting pin 23. The block 18 has a pair of parallel surfaces 18b, 18c provided perpendicularly to one surface 18c. A pair of connecting pins 23, 23, which are rectangular parallelepiped and are connected by screwing the male threaded portion 23a into the female threaded portion 18a, are simultaneously inserted into two pin insertion holes 19d continuously provided in the base 19. It has an insertable structure. When the receiving member 1 is manufactured using the mold 16 having the block 18 having such a structure, the stored item receiving portion 1a having a flat surface perpendicular to the longitudinal direction of the rod-like projection 1c is formed by the surface 18b. be done. In this case, there is an advantage that the degree of freedom in designing the stored article receiving portion 1a of the receiving member 1 increases.

As shown in FIG. 5(b), the first pin 17a, the second pin 17b, and the pair of connecting pins 23, 23 connected to the block 18 are fitted into the recesses 19c and secured with bolts 21a. It is fixed to the base 19 by screwing the bolt 21b into the female screw portion 23b through the through hole 20a of the bottom plate 20 fixed to the base 19 . Therefore, the outer diameter of the connecting pin 23 is made smaller than the inner diameter of the pin insertion hole 19d of the base 19 so that the air flow path sucked from the upper surface 19a side of the base 19 during vacuum forming is passed through the connecting pin 23 and the pin. It is possible to form between holes 19d. In this case, the manufacturing cost of the mold 16 can be reduced as compared with the case where the flow path is provided in a portion other than the pin insertion hole 19d in the base 19 or inside the first pin 17a or the second pin 17b.
Further, as already described, the pair of notch portions 22b, 22b of the through hole 20a can be at least partially exposed when the bolt 21b is inserted through the through hole 20a. In this case, the air sucked from the upper surface 19a side of the base 19 during vacuum forming passes through the notch 22b, which is not covered by the head of the bolt 21b, and is discharged downward from the bottom surface 19b side of the base 19. will be As described above, in the mold 16, since it is not necessary to newly process the above-described air flow path in the bottom plate 20, the manufacturing cost can be reduced.

Furthermore, in the mold 16, by changing the length of the first pin 17a projecting from the upper surface 19a of the base 19, the shape of the article that can be supported by the stored article receiving portion 1a is determined. That is, in the mold 16, by replacing the first pin 17a installed on the base 19 with one having a different length or by changing the position where the first pin 17a is installed on the base 19, Since the shape of the article receiving portion 1a of the receiving member 1 can be easily changed, the manufacturing cost can be reduced as compared with the case of remaking the mold from scratch. If the length of the first pin 17a and the position of the pin insertion hole 19d in which the first pin 17a is installed are recorded, the original state can be easily restored at any time. The base 19 can be stored with the pin 17a pulled out. That is, with the mold 16, unlike the case of conventional molds, it is not necessary to store all the molds that are manufactured for repeat production. Therefore, the mold 16 allows for savings in storage space.

FIG. 6(a) is an external perspective view of the mold 25 according to the second embodiment of the present invention, and FIGS. 6(b) and 6(c) are the upper mold shown in FIG. 26 is an external perspective view of the lower die 27. FIG. 7(a) is a side view of the third pin 17c and the fourth pin 17d, FIG. 7(b) is a view of the mold 25 viewed from the bottom side, and FIG. 7(c) is a FIG. 11 is a cross-sectional view showing a state in which a third pin 17c and a fourth pin 17d are attached to a mold 25; FIG. 7(c) shows a state in which the mold 25, the third pin 17c and the fourth pin 17d are cut by a plane passing through the central axes of the pin insertion hole 28 and the through hole 26a. 6(a) to 6(c), 7(b) and 7(c), through holes 26a, pin insertion holes 28, and large diameter holes 32 are shown to avoid complication of the drawings. and small-diameter holes 33, only some of them are denoted by reference numerals.
As shown in FIGS. 6(a) to 6(c), the aluminum mold 25 has a substantially rectangular parallelepiped shape, and includes a third pin 17c and a fourth pin 17d (see FIG. 7(a)). and a rectangular plate-shaped upper mold 26 which is placed on the upper surface 27a of the lower mold 27 and fixed to the lower mold 27 using bolts (not shown).
The lower die 27 is provided with a plurality of pin insertion holes 28 having a stepped structure perpendicular to the upper surface 27a. are provided, respectively. Part of the four corners of the lower mold 27 is cut out so that the portion where the bolt insertion hole 27c opens on the side of the bottom surface 27b forms an isosceles right triangle in plan view.
The upper die 26 has a plurality of through-holes that are circular in plan view so that the third pin 17c and the fourth pin 17d (see FIG. 7A), which are inserted into the pin insertion holes 28 of the lower die 27, can communicate with each other. A hole 26 a is provided at a location corresponding to the pin insertion hole 28 . At the four corners of the upper die 26, bolt insertion holes 26b, which are circular in plan view, are provided so that bolts (not shown) inserted through the bolt insertion holes 27c of the lower die 27 can be communicated therewith.

As shown in FIG. 7( a ), the third pin 17 c having a stepped structure has a tip 29 a that is pointed and has an outer diameter that is smaller than the inner diameter of the through hole 26 a of the upper die 26 . and a large-diameter portion 30 which is a cylindrical body having an outer diameter larger than that of the small-diameter portion 29. The fourth pin 17d, which also has a stepped structure, has an outer diameter larger than that of the small-diameter portion 29. It is composed of a small-diameter portion 31 and a large-diameter portion 30 which are equally cylindrical and have a shorter length than the small-diameter portion 29 .
In addition, the third pin 17c may have a cylindrical body such as the small diameter portion 31 having a flat surface perpendicular to the longitudinal direction instead of the small diameter portion 29 having a pointed end 29a.

As shown in FIGS. 7(b) and 7(c), the pin insertion hole 28 of the lower mold 27 has a circular shape in plan view, opens to the upper surface 27a, and has an inner diameter larger than the inner diameter of the through hole 26a of the upper mold 26. It is composed of a large-diameter hole 32 having a depth equal to the length of the large-diameter portions 30 of the third pin 17c and the fourth pin 17d and a small-diameter hole 33 opening in the bottom surface 27b.
The large diameter portion 30 of the third pin 17c and the fourth pin 17d has an outer diameter smaller than the inner diameter of the large diameter hole 32 of the pin insertion hole 28, and the small diameter portion 29 of the third pin 17c and the fourth pin. The small diameter portion 31 of 17 d has an outer diameter smaller than the inner diameter of the through hole 26 a of the upper die 26 . That is, in the mold 25, the air sucked from the upper surface 26c (see FIG. 7(c)) of the upper mold 26 during the vacuum molding passes through the third pin 17c, the fourth pin 17d, the through hole 26a and the through hole 26a. It has a structure in which it passes through the gap of the pin insertion hole 28 and is discharged downward from the bottom surface 27b of the lower die 27. As shown in FIG.

Since the inner diameter of the small-diameter hole 33 of the pin insertion hole 28 of the lower die 27 is smaller than the outer diameter of the large-diameter portion 30 of the third pin 17c and the fourth pin 17d, as shown in FIG. When the large diameter portions 30 of the third pin 17c and the fourth pin 17d are arranged inside the large diameter hole 32 of the insertion hole 28, the third pin 17c and the fourth pin 17d are inserted into the pin insertion hole 28. It does not slip through the small-diameter hole 33 and drop from the mold 25.例文帳に追加
Further, since the inner diameter of the through hole 26a of the upper mold 26 is smaller than the outer diameter of the large diameter portion 30 of the third pin 17c and the fourth pin 17d, the pin insertion hole 28 is formed as shown in FIG. After arranging the large diameter portions 30 of the third pin 17c and the fourth pin 17d inside the large diameter hole 32, the small diameter portion 29 of the third pin 17c and the small diameter portion 31 of the fourth pin 17d are penetrated. When the upper mold 26 is placed on the upper surface 27a of the lower mold 27 so as to pass through the hole 26a and both are fixed with bolts, the large diameter portion 30 is extracted from the large diameter hole 32 of the pin insertion hole 28 of the lower mold 27. The third pin 17 c and the fourth pin 17 d are fixed to the mold 25 . That is, unlike the structure of the mold 16 in which the first pins 17a and the second pins 17b are fixed one by one using the bolts 21b, the mold 25 has the upper mold 26 attached to the upper surface of the lower mold 27. The structure is such that the third pin 17c and the fourth pin 17d are fixed to the lower mold 27 at once by a simple operation of setting the pin 27a. As a result, the time required to install the third pin 17c and the fourth pin 17d on the lower die 27 is reduced. Therefore, according to the mold 25, manufacturing efficiency can be improved.

The receiving member for a transporting container of the present invention is installed inside the transporting container in order to support parts and products. It can be used when manufacturing a receiving member for a transport container.

DESCRIPTION OF SYMBOLS 1... Receiving member 1a... Stored article receiving part 1b... Recess 1c... Rod-shaped projection 2... Molding target part 3... Boundary part 3a... Meat stealing 4... First coupling part 4a... Seat plate 5... Protruding part 5a, 5b... Side plate 5c Top plate 5d Reinforcement plate 6, 7 Protrusions 8a, 8b Through hole 9 Opening 9a Locking portion 10 Second coupling portion 10a Seat plate 10b Slit 11a Slit 11b Locking piece 12 Engaging claw 13 Preform 13a First surface 13b Second surface 13c to 13f Side surface 14 Thermoforming device 15 Plug 16 Mold 17a First pin 17b Second 2 pin 17c... third pin 17d... fourth pin 18... block 18a... male screw part 18b, 18c... surface 19... base 19a... top surface 19b... bottom surface 19c... recess 19d... pin insertion hole 19e... screw hole 19f ... Bolt hole 20 ... Bottom plate 20a ... Through hole 20b ... Notch 21a, 21b ... Bolt 22a ... Circular part 22b ... Notch part 23 ... Connecting pin 23a ... Male screw part 23b ... Female screw part 24 ... Tip pin 24a ... Female screw Part 25 Mold 26 Upper mold 26 a Through hole 26 b Bolt insertion hole 26 c Upper surface 27 Lower mold 27 a Upper surface 27 b Bottom surface 27 c Bolt insertion hole 28 Pin insertion hole 29 Small diameter portion 29 a Tip 30 Large-diameter hole 31 Small-diameter hole 32 Large-diameter hole 33 Small-diameter hole

Claims (7)

A mold for forming an article receiving part having a plurality of rod-shaped projections on a part of a thermoplastic resin plate material by vacuum forming,
a plurality of pins made of a cylinder or a cylinder;
a base in which a plurality of pin insertion holes that are circular in plan view are provided perpendicularly to the upper surface;
a bottom plate installed on the base so as to close the lower end of the pin insertion hole;
The bottom plate is provided with a through hole parallel to the thickness direction at a location corresponding to the pin insertion hole,
A mold according to claim 1, wherein the pin is fixed in a state in which the base end thereof is inserted through the pin insertion hole so that the tip end thereof protrudes from the upper surface of the base. The pin includes a connecting pin having a male threaded portion protruding in the longitudinal direction at the upper end and a female threaded portion screwed with the male threaded portion provided at the lower end in parallel with the longitudinal direction, and the female threaded portion at the lower end. 2. The mold according to claim 1, further comprising a tip pin having a threaded portion parallel to the longitudinal direction. A block made of a rectangular parallelepiped is provided instead of the tip pin,
3. The mold according to claim 2, wherein the block has the female thread formed perpendicular to one of a pair of parallel surfaces. The outline of the inner wall surface of the through-hole includes a circular portion having a diameter smaller than the inner diameter of the pin insertion hole and larger than the inner diameter of the female screw portion when viewed from above, and the pin insertion hole. 3. The mold according to claim 2, wherein the mold is constituted by a notch portion provided in a part of the circular portion so as to protrude radially outward. 2. The mold according to claim 1, wherein at least a part of the upper surface of the base has a rounded quadrangular shape with four rounded corners in a plan view. A mold for forming an article receiving part having a plurality of bar-shaped projections on a part of a thermoplastic resin plate material by vacuum forming,
a plurality of pins having a stepped structure consisting of a columnar body or a cylindrical body;
a lower die in which a plurality of pin insertion holes having a stepped structure are provided perpendicularly to the upper surface;
an upper die provided with a through-hole having a circular shape in a plan view at a location corresponding to the pin insertion hole and parallel to the thickness direction and installed on the upper surface of the lower die;
The pin insertion hole comprises a small-diameter hole that is circular in plan view and opens to the bottom side, and a large-diameter hole that is circular in plan view and opens to the top side,
The pin has a small-diameter portion formed of a cylindrical body whose outer diameter is smaller than the inner diameter of the through-hole of the upper die, and the inner diameters of the small-diameter hole of the lower die and the through-hole of the upper die. A large-diameter portion having a larger outer diameter than the
The large-diameter portion of the pin has an outer diameter smaller than an inner diameter of the large-diameter hole of the lower die, and a depth and length of the large-diameter hole of the lower die equal to each other. . A step of forming a flat preform by injection molding of a thermoplastic resin;
heating a portion of the preform to a heat distortion temperature;
Vacuum forming is performed by pressing the mold according to any one of claims 1 to 6 against the heated portion of the preform to form the article receiving portion on a portion of the preform. A method for manufacturing a receiving member for a transporting container, comprising: a forming step;

Images