JP6790450B2 - Fitting manufacturing equipment and fitting manufacturing method - Google Patents

Description

The present invention is a joint manufacturing apparatus for forming a joint having a linear flow path and a curved flow path connected to one end of the straight flow path and curved and extending with respect to the axis of the straight flow path by injection molding. And a method of manufacturing a joint using the same device.

Examples of this type of joint include a U-shaped joint. The electrofusion joint (electric fusion joint) as a U-shaped joint has a heating layer in which a heating wire is wound in a coil shape on the inner peripheral portion of the joint body made of synthetic resin, and the outer peripheral portion of the joint body has a heating layer. It has a pair of terminals to which both ends of the heating wire are connected. On the other hand, the outer peripheral portion of the resin pipe is formed of uncrosslinked resin, and the inner peripheral portion is formed of crosslinked resin. Then, with the resin pipe inserted in the joint body, electricity is applied between the pair of terminals to generate heat, and the heating layer of the joint body and the outer peripheral portion of the resin pipe are heat-sealed. .. Such a U-shaped joint can be molded by injection molding of a synthetic resin.

For example, Patent Document 1 discloses a method for manufacturing this type of U-shaped joint. That is, as one of the methods for manufacturing the U-shaped joint, a method in which a U-shaped core is made of metal or the like and this core is used as an insert is mentioned. That is, it is a method in which a core is set in an injection molding mold, a resin is injected around the core to mold the core, the molded product is demolded together with the core, and then the core is removed from the molded product.

However, the core must be extracted from the U-shaped pipe portion formed on the outer circumference of the core, and there are ingenuity for enabling the extraction and restrictions on the shape of the U-shaped joint. For example, even if the core is split in half by the U-shaped folded part, the core's half-split body has an undercut shape that forms a J-shape. Therefore, if the U-shaped tube part is a normal U-shape, the core Half-split body cannot be removed. Therefore, the U-shaped tube portion must be shaped so that the half-split body of the core can be removed, and the vicinity of the U-shaped folded portion cannot be formed into a smooth U-shape, which may impair the smooth flow of the heat medium.

Therefore, in the method for manufacturing a U-shaped joint according to the invention described in Patent Document 1, a resin molded body molding step of blow molding a resin molded body having a hollow portion and a freezing step of injecting a liquid into the hollow portion and freezing the hollow portion. The outer shell forming step of injection molding the outer shell using the resin molded body as an insert and the liquid discharging step of discharging the liquid in the hollow portion are provided.

Japanese Unexamined Patent Publication No. 2005-3135

In the method for manufacturing a U-shaped joint having a conventional configuration described in Patent Document 1, a resin molded body molding step by blow molding, a freezing step of injecting a liquid into a hollow portion and freezing it, and a liquid discharge of the liquid are discharged. A process is provided. For this reason, a blow molding device for molding a resin molded body, a refrigerating device for freezing a liquid, a discharging device for discharging the liquid, and the like are required, the equipment is complicated, and the manufacturing process is complicated. Therefore, there is a problem that it takes time to manufacture the U-shaped joint and the manufacturing efficiency is low.

Note that these problems are not limited to the U-shaped joint described above, but are a curved flow path that is connected to a straight flow path and one end of the straight flow path and that curves and extends with respect to the axis of the straight flow path. It can occur in common in joints having and.

Therefore, an object of the present invention is to provide a joint manufacturing apparatus and a manufacturing method capable of improving the joint manufacturing efficiency with a simple configuration.

A joint manufacturing apparatus for achieving the above object has a linear flow path and a curved flow path that is connected to one end of the linear flow path and that is curved and extends with respect to the axis of the straight flow path. It is a joint manufacturing apparatus for molding a joint having a joint by injection molding, and has an outer peripheral molding mold for molding the outer peripheral portion of the joint and an outer peripheral molding mold arranged in the outer peripheral molding mold to form a linear flow path and a curved flow path. A flow path molding die for molding is provided, and a cavity into which the molten synthetic resin is injected is formed between the outer peripheral molding die and the flow path molding die, and the flow path molding die is the straight line. It has a linear flow path molding die for forming a flow path and a curved flow path molding die for forming the curved flow path, and the curved flow path molding die has the outer periphery for cutting out the linear flow path molding die. When the linear flow path molding die is retracted with respect to the partial molding die, it is rotated by utilizing the space formed between the linear flow path molding die and the curved flow path molding die, and the straight line is formed. It is configured so that it can be die-cut along the die-cutting direction of the flow path molding die.

In the joint manufacturing apparatus, the joint has two linear flow paths and two curved flow paths connected to one ends of the two linear flow paths to form a U-shaped flow path. It is a shaped joint, and the flow path molding die has two linear flow path molding dies and two curved flow path molding dies, and the U-shaped flow path is formed by the two curved flow path molding dies. It is preferable that the U-shaped flow path molding die to be molded is configured, and the two curved flow path molding dies are rotated so as to be die-cut.

In the joint manufacturing apparatus, the U-shaped flow path molding die is divided into two at the center of the U-shaped flow path by the two curved flow path molding dies, and the curved flow path molding dies can open and close each other. It is preferable that it is configured in.

In the joint manufacturing apparatus, it is preferable that the facing surfaces of the two curved flow path molding molds are formed with misalignment prevention portions that engage with each other to prevent misalignment due to the unevenness relationship.
In the joint manufacturing apparatus, the joint has a connecting flow path to which an end opposite to the end connected to the linear flow path in the curved flow path is connected, and the flow path is formed. The mold preferably has a connection flow path molding mold that forms the connection flow path.

In the joint manufacturing apparatus, the connecting flow path extends linearly, and the curved flow path has an acute angle between the axis of the connecting flow path and the axis of the linear flow path with respect to the connecting flow path. It is preferable that the connection flow path molding die is divided into two so as to be die-cuttable in a direction away from each other along the axis of the connection flow path.

In the joint manufacturing apparatus, an insertion hole is formed in the linear flow path molding die, and a holding hole communicating with the insertion hole is formed in the curved flow path molding die. A connecting member is inserted through the hole and the holding hole, and the tip end portion of the connecting member is rotatably supported around a rotation shaft fixed in the holding hole, and is inside the insertion hole. Is preferably provided with a regulating portion that regulates the relative movement of the connecting member toward the tip end side with respect to the linear flow path molding die.

In the joint manufacturing apparatus, when the straight flow path molding die is retracted by a predetermined distance from the outer peripheral portion molding die in order to die out the straight flow path molding die, the restricting portion causes the linear flow. It is preferable to regulate the relative movement of the connecting member to the tip side with respect to the path forming mold.

The method for manufacturing a joint for achieving the above object is a method for manufacturing a joint using the joint manufacturing apparatus, in which the flow path molding die is placed in the outer peripheral molding die and then in the cavity. The injection molded body is formed by injecting the molten synthetic resin into the molded product, and then the curved flow path molding die is rotated to extract the flow path molding die from the outer peripheral molding die to manufacture the joint.

According to the joint manufacturing apparatus and the joint manufacturing method of the present invention, it is possible to improve the joint manufacturing efficiency with a simple configuration.

In the first embodiment, a cross-sectional view showing a state in which a flow path molding die is arranged in an outer peripheral molding die to form a cavity, and molten resin is injected into the cavity. FIG. 5 is a cross-sectional view showing a state in which an outer peripheral molding die is arranged in a mold of the injection molding machine of the same embodiment, and a flow path molding die is arranged in the outer peripheral molding die to form a cavity. (A) is a perspective view showing a U-shaped joint of the same embodiment, and (b) is a sectional view showing a U-shaped joint of the same embodiment. The front view which shows the mold split surface in the state which the outer peripheral molding die of the same embodiment was opened. The front view which shows the flow path molding mold of the same embodiment. (A) and (b) are cross-sectional views showing the flow path molding mold of the same embodiment. (A) and (b) are cross-sectional views showing a state in which one of the split molds of the U-shaped flow path molding mold in the same embodiment is opened. (A) is a front view showing a state in which one split mold of the U-shaped flow path molding die is opened and a coiled heating wire is attached to the split die with a finger, and (b) is a coiled shape in both split molds. The front view which shows the state which attached the heating wire of. The front view which shows the state which arranged the flow-through molding die which attached the coil-shaped heating wire in the outer peripheral molding die. (A) is a cross-sectional view showing a state in which the terminal is arranged above the terminal holding pin holding the terminal of the heating wire, and (b) is a cross-sectional view showing a state in which the terminal is held by the terminal holding pin. It is a figure explaining the operation of the same embodiment, and is the cross-sectional view which shows the state which took out the flow path molding die slightly from the outer peripheral molding die after injection molding. It is a figure explaining the operation of the same embodiment, and is the cross-sectional view which shows the state in which the flow path molding die was further extracted from the outer peripheral molding die from the state of FIG. It is a figure explaining the operation of the same embodiment, and is the cross-sectional view which shows the state which finished drawing out the flow path molding die from the outer peripheral molding die from the state of FIG. (A) is a plan view showing the Y-shaped joint of the second embodiment, and (b) is a cross-sectional view showing the Y-shaped joint of the same embodiment. A cross-sectional view showing a state in which a flow path molding die equipped with a coiled heating wire is arranged on the outer peripheral molding die. A cross-sectional view showing a state in which molten resin is injected into a cavity formed between an outer peripheral molding die and a flow path molding die. It is a figure explaining the operation of the same embodiment, and is the cross-sectional view which shows the state which took out the flow path molding die slightly from the outer peripheral molding die after injection molding. It is a figure explaining the operation of the same embodiment, and is the cross-sectional view which shows the state which the flow path molding die was further extracted from the outer peripheral part molding die from the state of FIG. 17, and the curved flow path molding die started to rotate.

<First Embodiment>
Hereinafter, the first embodiment embodying the present invention will be described in detail with reference to FIGS. 1 to 13.
First, a heat fusion joint (electrofusion joint) as the joint of the present embodiment will be described.

As shown in FIGS. 3A and 3B, the U-shaped joint main body 12 constituting the U-shaped joint 11 is a U that connects a pair of parallel straight lines 13 and one end of the straight lines 13. It is composed of a character connecting portion 14. A linear flow path 15 extending along the axes x and y is formed in each straight line portion 13, and a U-shaped flow path 16 is formed in the U-shaped connecting portion 14. Resin pipes 17 are connected to the other ends of both linear flow paths 15 so as to extend in the same direction. An arc-shaped protrusion 18 extends to the outside of the U-shaped connecting portion 14, and a mounting hole 19 for mounting a weight is opened at the center thereof.

A heat-sealed portion 21 made of a thermoplastic resin such as an uncrosslinked polyolefin resin in which a heating wire 20 made of a conductive metal such as a nichrome wire is wound in a coil shape on the inner peripheral portion of both straight portions 13. Are provided so as to face the inner peripheral surface of the straight portion 13. The U-shaped joint body 12 portion other than these heat-sealing portions 21 is formed of a cross-linked resin such as a cross-linked polyolefin resin.

A pair of support protrusions 22 are provided on each of the straight lines 13, and terminals 23 are supported on each support protrusion 22. One end and the other end of the heating wire 20 are connected to a pair of terminals 23 provided on each straight line portion 13. Then, by energizing the heating wire 20 via the terminal 23, the thermoplastic resin of the heat-sealing portion 21 is melted, and the resin pipe 17 is connected to each straight portion 13. A connecting portion 24 for connecting the two straight portions 13 is provided between the two straight portions 13.

Next, an apparatus for manufacturing the U-shaped joint 11 by injection molding will be described.
As shown in FIG. 1, in the U-shaped joint 11 manufacturing apparatus, a flow path for forming a linear flow path 15 and a U-shaped flow path 16 in an outer peripheral portion molding die 25 for forming the outer peripheral portion of the U-shaped joint 11. The molding die 26 is arranged, and in that state, the cavity 27, which is an injection space for the molten resin, is formed. Molten resin is injected into the cavity 27 to form the outer peripheral portion of the U-shaped joint 11.

As shown in FIG. 2, the outer peripheral molding die 25 and the flow path molding die 26 are arranged in the molds 28 and 29 of the injection molding machine and are molded. Then, the molten resin is injected into the cavity 27 via the sprue 30 in the molds 28 and 29, the runner 31 in the outer peripheral molding mold 25, the gate 32, and the like.

As shown in FIG. 4, the outer peripheral molding die 25 has an accommodating portion 33 for accommodating the flow path forming die 26, and the flow path forming die 26 as an insert is placed at a predetermined position of the accommodating portion 33 by a pin or the like (not shown). Both molds 25 and 26 are configured to be magnetically coupled while being positioned. Therefore, the misalignment of both molds 25 and 26 can be prevented, and the workability of assembling both molds 25 and 26 to the injection molding machine can be improved. As shown in FIG. 9, the flow path molding die 26 is housed in a predetermined position of the accommodating portion 33 of the outer peripheral molding die 25, and the cavity 27 is formed between the outer peripheral molding die 25 and the flow path molding die 26. Will be done.

As shown in FIG. 4, a pair of terminal holding portions 34 are provided on both side portions of the outer peripheral portion molding die 25. As shown in FIG. 10A, the terminal holding portion 34 is composed of a pair of holding pins 36 protruding from the storage hole 35, and these holding pins 36 have elasticity. Then, as shown in FIGS. 9 and 10B, each terminal 23 of the heating wire 20 is placed between the holding pins 36 in a state where the flow path molding die 26 is arranged in the outer peripheral molding die 25. Be pinched.

As shown in FIG. 5, the flow path molding die 26 includes a pair of first straight flow path molding die 37 and a second straight flow path molding die 38 forming both straight flow paths 15, and a U-shaped flow path 16. It is composed of a U-shaped flow path molding die 39 to be formed. The U-shaped flow path molding die 39 is composed of a first split die 40 and a second split die 41 which are divided into two at the central portion thereof, and can be opened and closed with each other. In the present embodiment, these split dies 40 and 41 function as curved flow path forming dies.

As shown in FIGS. 5, 8 (a) and 8 (b), the heating wire of the U-shaped joint 11 is formed on the outer peripheral surfaces of the first straight flow path molding die 37 and the second straight flow path molding die 38. A heating wire mounting portion 43 on which the 20 is mounted is formed. As shown in FIG. 8A, for example, in a state where the first division type 40 is opened, that is, in a state where the first division type 40 is separated from the second division type 41, a coil-shaped electric current is applied to the first division type 40. The heat wire 20 is pressed with a finger 45 to be fitted and inserted, and can be mounted on the heating wire mounting portion 43 of the first linear flow path molding die 37.

As shown in FIGS. 6A and 6B, the engaging convex portions 46 having a semicircular cross section forming the misalignment prevention portions on the facing surfaces of the first division type 40 and the second division type 41, respectively. And an engaging recess 47 are provided to prevent misalignment between the first split mold 40 and the second split mold 41 in the closed state. A smooth arc-shaped U-shaped flow path 16 can be formed by the misalignment prevention portion formed by the engaging convex portion 46 and the engaging concave portion 47.

The base end portions of the first straight flow path molding die 37 and the second straight flow path molding die 38 are fixed by screws so as to extend in a direction orthogonal to the base portion 48. Insertion holes 50 communicating with the holding holes 49 in the first split mold 40 and the second split mold 41 are formed in the first straight flow path molding die 37 and the second straight flow path molding die 38, respectively. ing. A connecting member 52 for holding the first division type 40 and the second division type 41 and opening and closing the first division type 40 is inserted into each insertion hole 50. The tip portions of these connecting members 52 are rotatably connected to a rotation shaft 53 fixed in the holding hole 49 of the first division type 40 or the second division type 41. A regulation pin 54 is inserted into the base end portion of the connecting member 52, and the regulation pin 54 is located in a widening portion 51 formed at the base end portion of the insertion hole 50. As shown in FIG. 6B, the length of the regulation pin 54 is formed to be larger than the width of the portion on the tip end side of the insertion hole 50. Therefore, when the regulation pin 54 moves relative to the tip side, it comes into contact with the regulation surface 55 forming the widening portion 51 of the insertion hole 50.

Then, as shown in FIGS. 7A and 7B, for example, when the first division mold 40 is rotated so as to open the mold, the regulation pin 54 of the connecting member 52 is inside the widening portion 51 of the insertion hole 50. Although it moves relative to the tip side from the base end side, it hits the regulation surface 55 forming the widening portion 51, and further relative movement to the tip end side is restricted. Further, as shown in FIG. 7A, the insertion hole 50 is in the opposite direction of the split molds 40 and 41 so that the movement of the connecting member 52 is not hindered when the split molds 40 and 41 rotate [FIG. 7]. The width is widened in the left-right direction of (a)].

As shown in FIG. 12, of the inner peripheral surfaces of the first division type 40 and the second division type 41, the guide portion 56 is formed on the facing surface side of the first division type 40 and the second division type 41. There is. Then, when the flow path forming die 26 is die-cut, the guide portions 56 of the first split die 40 and the second split die 41 are guided by the curved surface of the joint portion 24 (see FIG. 11) of the U-shaped joint 11. The 1-split mold 40 and the 2nd split mold 41 are configured so that they can rotate in opposite directions with respect to the rotation shaft 53 and can be opened. In this case, as shown in FIG. 12, in the state where the first split mold 40 and the second split mold 41 are most open, the linear flow path molding molds 37 and 38 of the first split mold 40 and the second split mold 41 Since the length d in the width direction is formed shorter than the width D of the linear flow path molding dies 37 and 38, the first split die 40 and the second split die 41 can be die-cut when the flow path molding die 26 is die-cut. It has become.

The connecting member 52, the rotating shaft 53, the guide portion 56 of the split dies 40 and 41, and the like constitute a die-cutting mechanism for punching the split dies 40 and 41. Further, the regulation pin 54, the regulation surface 55 of the linear flow path molding dies 37, 38, and the like constitute a regulation portion that regulates the relative movement of the connecting member 52 toward the tip end side.

Next, a method of manufacturing the U-shaped joint 11 using the manufacturing apparatus of the U-shaped joint 11 configured as described above will be described.
As shown in FIG. 1, in a state where the flow path molding die 26 is arranged in the outer peripheral molding die 25, the molten resin is injected into the cavity 27 via the runner 31 and the gate 32, and a pair of U-shaped joints 11 are formed. An injection molded body 60 having a straight portion 13, a U-shaped connecting portion 14, and a protruding portion 18 is molded.

As shown in FIG. 11, after molding the injection molded body 60, the base portion 48 of the flow path molding die 26 is retracted from the outer peripheral portion molding die 25. At this time, the regulation pin 54 of both connecting members 52 moves relative to the tip side in the widening portion 51 of the insertion hole 50 of the first straight flow path molding die 37 and the second straight flow path molding die 38 to reach the regulation surface 55. Engage.

As shown in FIG. 12, when the base portion 48 of the flow path molding die 26 is further retracted from the state of FIG. 11 and the retracting distance with respect to the outer peripheral molding die 25 reaches a predetermined distance, the regulation pin 54 is brought to the regulation surface 55. Since the connecting member 52 is engaged and the relative movement to the tip side is restricted, the connecting member 52 is pulled toward the base portion 48 side together with the linear flow path molding dies 37 and 38. Further, a space is formed between the linear flow path molding dies 37 and 38 and the split dies 40 and 41 to allow the split dies 40 and 41 to rotate. Therefore, the guide portion 56 of the first division type 40 and the second division type 41 is guided along the joint portion 24 of the U-shaped joint 11, and the first division type 40 is in the clockwise direction of FIG. 12 and the second division type 41. Is extracted while opening the mold counterclockwise in FIG.

When the base portion 48 of the flow path molding die 26 is further retracted from the state of FIG. 12, the split dies 40 and 41 are die-cut along the die-cutting direction of the straight flow path molding dies 37 and 38. Then, as shown in FIG. 13, the flow path molding die 26 is completely extracted from the outer peripheral molding die 25. After that, the U-shaped joint 11 remaining in the cavity 27 of the outer peripheral molding die 25 is taken out according to a conventional method.

Next, the operation of the U-shaped joint 11 manufacturing apparatus configured as described above will be described.
By the way, as shown in FIG. 1, in the manufacturing apparatus of the U-shaped joint 11, the flow path forming dies 26 arranged in the outer peripheral forming die 25 are a pair of linear flow path forming dies 37, 38 and U-shaped flow path forming. It is composed of a mold 39, and the U-shaped flow path forming mold 39 is composed of a first split mold 40 and a second split mold 41. Further, the two split types 40 and 41 are supported by a connecting member 52, a rotation shaft 53 at the tip thereof, and a regulation pin 54 at the base end so as to be openable and closable.

Therefore, as shown in FIG. 12, when the base portion 48 of the flow path molding die 26 is retracted after the injection molding of the U-shaped joint 11, a tensile force acts on the split dies 40 and 41 by the regulation pin 54 and the connecting member 52. Then, the guide portion 56 of the split molds 40 and 41 is guided to the joint portion 24 of the U-shaped joint 11. Then, the split molds 40 and 41 rotate about the rotation shaft 53, and the split molds 40 and 41 are opened so as to be separated from each other. As a result, the flow path molding die 26 can be extracted from the outer peripheral molding die 25, and a pair of straight flow paths 15 and a U-shaped flow path 16 can be formed in the U-shaped joint 11.

Regarding this point, as described in Patent Document 1, it has been conventionally considered difficult to form a U-shaped tube portion using a core divided into two, whereas in the present embodiment, it is difficult to form a U-shaped tube portion. The U-shaped flow path 16 can be formed by rotating the two split dies 40 and 41 based on the die-cutting mechanism as described above.

The effects exhibited by the above embodiments will be summarized below.
(1) In the manufacturing apparatus of the U-shaped joint 11 in this embodiment, the flow path molding die 26 is arranged in the outer peripheral molding die 25, and the cavity 27 is formed between them. The flow path molding die 26 is composed of linear flow path molding dies 37 and 38 for forming the linear flow path 15 and a U-shaped flow path molding die 39 for forming the U-shaped flow path 16, and is composed of a U-shaped flow path molding die 39. Is divided into two parts, a first division type 40 and a second division type 41. The split dies 40 and 41 are the linear flow path molding dies 37 and 38 when the linear flow path molding dies 37 and 38 are retracted with respect to the outer peripheral molding dies 25 in order to die out the linear flow path molding dies 37 and 38. It is configured to be rotated by utilizing the space formed between the split dies 40 and 41 and to be die-cut along the die-cutting direction of the linear flow path molding dies 37 and 38.

Therefore, when the outer peripheral portion of the U-shaped joint 11 is molded by injection molding and then the flow path molding die 26 is extracted, the split dies 40 and 41 are die-cut following the die-cutting of the linear flow path forming dies 37 and 38. To. Therefore, the linear flow path 15 and the U-shaped flow path 16 of the U-shaped joint 11 can be quickly formed by a simple operation of pulling out the flow path molding die 26 from the outer peripheral molding die 25 as in the normal injection molding. it can.

Therefore, according to the U-shaped joint 11 manufacturing apparatus of this embodiment, the manufacturing efficiency of the U-shaped joint 11 can be improved with a simple configuration.
(2) The U-shaped flow path molding die 39 is composed of split dies 40 and 41 that divide the U-shaped flow path 16 into two at the central portion, and the split dies 40 and 41 are configured to be openable and closable. Therefore, the two split dies 40 and 41 can be formed symmetrically, and the two split dies 40 and 41 can be die-cut in a well-balanced manner.

(3) On the facing surfaces of the two split molds 40 and 41, an engaging convex portion 46 and an engaging concave portion 47 are formed as a misalignment prevention portion that engages with each other due to the unevenness to prevent the misalignment. There is. Therefore, when the two-split molds 40 and 41 that have been opened are closed, the misalignment of the two-split molds 40 and 41 on the mold matching surface can be prevented, and a U-shaped flow path 16 having a smooth curved surface shape can be formed. Injection molding can be carried out smoothly.

(4) An insertion hole 50 is formed in the linear flow path forming molds 37 and 38, and a holding hole 49 communicating with the insertion hole 50 is formed in the split molds 40 and 41. A connecting member 52 is inserted through the holding hole 49, and the tip end portion of the connecting member 52 is rotatably supported around a rotation shaft 53 fixed in the holding hole 49. In the insertion hole 50, a regulating portion for restricting the relative movement of the connecting member 52 to the linear flow path molding dies 37 and 38 toward the tip end side is provided.

Therefore, the linear flow path forming dies 37 and 38 can be die-cut together with the base portion 48, and the split dies 40 and 41 can be rotated around the rotation shaft 53 by the movement of the connecting member 52 and die-cut. ..

(5) The insertion hole 50 is formed so that the movement of the connecting member 52 is not hindered when the split molds 40 and 41 rotate. Therefore, the split dies 40 and 41 can be smoothly rotated, and the die can be quickly cut out.

(6) When the linear flow path molding die 37, 38 is retracted by a predetermined distance with respect to the outer peripheral portion molding die 25 in order to die out the linear flow path molding die 37, 38, the regulating portion forms the linear flow path. The relative movement of the connecting member 52 to the molds 37 and 38 toward the tip end is restricted. Therefore, when the regulation of the relative movement of the connecting member 52 is started, a space for rotation of the split dies 40 and 41 is formed between the linear flow path forming dies 37 and 38 and the split dies 40 and 41. As a result, die cutting can be performed smoothly.

(7) In the method of manufacturing a U-shaped joint, after arranging the flow path molding die 26 in the outer peripheral molding die 25, the molten resin is injected into the cavity 27 to form the injection molded body 60, and then the flow path molding. The U-shaped joint 11 is manufactured by opening the molds 26 into two split dies 40 and 41 of the U-shaped flow path forming dies 39 and extracting them from the outer peripheral forming dies 25. Therefore, the U-shaped joint 11 can be easily manufactured by the same operation as the normal injection molding using an insert (nesting), and the manufacturing efficiency of the U-shaped joint 11 can be improved.

(8) The two split dies 40 and 41 are evenly opened by the joint portion 24 formed between the straight flow paths 15 of the U-shaped joint 11, and the flow path forming die 26 is extracted from the outer peripheral forming die 25. Is done. Therefore, the split dies 40 and 41 can be smoothly die-cut, and the U-shaped joint 11 can be manufactured in a stable state.

<Second Embodiment>
Hereinafter, the second embodiment will be described with reference to FIGS. 14 to 18, focusing on the differences from the first embodiment.

As shown in FIGS. 14A and 14B, the joint body 71A of the Y-shaped joint 71 has a body portion 72 extending linearly and a branching portion 73 branching from the middle of the main body portion 72. And have.
As shown in FIG. 14B, a connecting flow path 74 extending along the linear axis m is formed in the main body 72. The connecting flow path 74 is formed with a reduced diameter portion 75 located at the central portion in the extending direction and an enlarged diameter portion 76 located at both end portions.

In the branch portion 73, a straight flow path 77 extending along the linear axis n, one end of the straight flow path 77, and a reduced diameter portion 75 of the connection flow path 74 are connected to each other. A curved flow path 78 that curves and extends with respect to the axis n of 77 is formed. The axis m of the connecting flow path 74 and the axis n of the straight flow path 77 intersect at an acute angle α.

The same heat fusion portions 21 as in the first embodiment are provided at both ends of the main body 72 and the inner peripheral portions of the branch 73. The portion of the joint body 71A other than the heat-sealed portion 21 is formed of a crosslinked resin such as a crosslinked polyolefin resin.

A resin pipe 17 is connected to both the enlarged diameter portions 76 and the straight flow path 77 of the connection flow path 74, respectively.
As shown in FIG. 14A, a pair of support protrusions 22 are provided on both ends of the main body 72 and the outer peripheral surfaces of the branch 73, and each support protrusion 22 is the same as in the first embodiment. The terminal 23 is supported.

Next, a manufacturing apparatus for the Y-shaped joint 71 will be described.
As shown in FIG. 15, in the manufacturing apparatus for the Y-shaped joint 71, a pair of connecting flow paths for forming the connection flow path 74 in the accommodating portion of the outer peripheral portion molding die 79 for forming the outer peripheral portion of the Y-shaped joint 71. A flow path molding die 80 including molding dies 82 and 83, a straight flow path molding die 86 for molding a straight flow path 77, and a curved flow path molding die 87 for molding a curved flow path 78 is arranged. That is, the linear flow path molding die 86, the curved flow path molding die 87, and the connection flow path molding die 82, 83 have the axis n of the linear flow path molding die 86 with respect to the axis m of the connection flow path molding die 82, 83. Are arranged so as to intersect at an acute angle α.

The connection flow path molding dies 82 and 83 each extend linearly and are divided into two at the central portion of the reduced diameter portion 75 of the connection flow path 74, and are separated from each other along the axial direction of the connection flow path 74. It is possible to die out in the direction of Engagement protrusions 84 and engagement recesses 85 are provided on the facing surfaces of the connection flow path molding dies 82 and 83, respectively, to prevent misalignment of the connection flow path molding dies 82 and 83 in the molded state. ..

A base portion 88 is fixed to the base end portion of the linear flow path molding die 86 by a screw (not shown).
The linear flow path molding die 86 has the same configuration as the linear flow path molding dies 37 and 38 of the first embodiment. That is, an insertion hole 90 is formed in the linear flow path molding die 86. A holding hole 89 communicating with the insertion hole 90 is formed in the curved flow path molding die 87. A connecting member 91 is inserted through the insertion hole 90 and the holding hole 89, and the tip of the connecting member 91 is rotatably supported around a rotation shaft 92 fixed in the holding hole 89. .. In the insertion hole 90, a regulating portion for restricting the relative movement of the connecting member 91 to the tip side with respect to the linear flow path molding die 86 is provided. This regulation portion has the same configuration as that of the first embodiment, and is composed of a regulation pin 93 provided at the base end portion of the connecting member 91, a regulation surface 94 of the linear flow path molding mold 86, and the like.

The curved flow path molding mold 87 has basically the same configuration as the split molds 40 and 41 of the first embodiment. However, the curved flow path molding die 87 does not have a portion corresponding to the engaging convex portion 46 or the engaging concave portion 47. As shown in FIG. 18, the facing surface of the curved flow path molding die 87 facing the outer peripheral surfaces of the connection flow path molding dies 82 and 83 has a curved concave surface that can abut on the outer peripheral surface.

Next, a method of manufacturing the Y-shaped joint 71 using the manufacturing apparatus of the Y-shaped joint 71 configured as described above will be described.
As shown in FIG. 16, in a state where the flow path molding die 80 is arranged in the outer peripheral molding die 79, the molten resin is injected into the cavity 81 via a runner and a gate (both not shown), and a Y-shaped joint is formed. An injection molded body 95 having a main body portion 72 and a branch portion 73 of 71 is molded.

After that, as shown in FIG. 17, the connection flow path molding dies 82 and 83 and the linear flow path molding die 86 are retracted from the outer peripheral molding die 79, respectively. At this time, the regulation pin 93 of the connecting member 91 moves relative to the tip side in the insertion hole 90 and engages with the regulation surface 94. Further, a space is formed between the linear flow path molding die 86 and the curved flow path molding die 87 to allow the curved flow path molding die 87 to rotate.

When the linear flow path molding die 86 is further retracted from the state of FIG. 17, as shown in FIG. 18, the regulation pin 93 is engaged with the regulation surface 94 and the relative movement to the tip side is restricted. , The connecting member 91 is retracted together with the linear flow path molding die 86. Therefore, the curved flow path molding die 87 is guided along the curved surface of the curved flow path 78 while being rotated around the rotation shaft 92, and is extracted along the die cutting direction of the linear flow path molding die 86. ..

The effects exhibited by the above embodiments will be summarized below.
(9) The Y-shaped joint 71 has a connecting flow path 74 to which an end opposite to the end connected to the straight flow path 77 in the curved flow path 78 is connected. The flow path molding die 80 has a linear flow path molding die 86 for molding a straight flow path 77 and a curved flow path molding die 87 for forming a curved flow path 78, and the curved flow path molding die 87 is a linear flow. It is configured so that it can be die-cut by being rotated along with the die-cutting operation of the path forming die. Further, the flow path molding die 80 has connection flow path molding dies 82 and 83 for forming the connection flow path 74.

According to such a configuration, the manufacturing efficiency of the Y-shaped joint 71 can be improved with a simple configuration.
(10) The connection flow path molding dies 82 and 83 extend in a straight line, and the linear flow path molding dies 86, the curved flow path molding dies 87, and the connection flow path molding dies 82 and 83 are connected flow paths. The linear flow path is arranged so that the axis n of the linear flow path molding die 86 intersects the axis m of the molding dies 82 and 83 at an acute angle.

In a Y-shaped joint having a conventional configuration in which the axis m of the connecting flow path 74 and the axis line n of the straight flow path 77 intersect at an acute angle α, the straight flow path 77 is directly connected to the connecting flow path 74. In this case, the corner portion 96 of the joint body 71A formed by the inner peripheral surface of the straight flow path 77 and the inner peripheral surface of the connecting flow path 74 is formed at the acute angle α. Therefore, when forming a Y-shaped joint, a molding defect called a weld is likely to occur in the corner portion. In addition, stress concentration is likely to occur in the sharp corner portion, which may cause insufficient strength in combination with molding defects.

In this respect, in the Y-shaped joint 71 manufactured by the manufacturing apparatus having the above configuration, the linear flow path 77 and the connection flow path 74 are connected via the curved flow path 78. Therefore, the corner portion 96 has a shape that is higher than the acute angle α while taking the configuration that the axis m of the connecting flow path 74 and the axis n of the straight flow path 77 intersect at an acute angle α. Therefore, it is possible to suppress the occurrence of molding defects in the corner portion 96 and the concentration of stress, and it is possible to avoid insufficient strength.

It is also possible to embody the embodiment by modifying it as follows.
The manufacturing apparatus and manufacturing method of the U-shaped joint 11 may be applied to a U-shaped joint in which two or more U-shaped joints 11 manufactured in the embodiment are connected.

The two straight portions 13 of the U-shaped joint 11 may be configured so that the lengths of one straight portion 13 and the other straight portion 13 are different. In this case, the position of the heat-sealing portion 21 may also be configured to be different between the straight line portion 13 on one side and the straight line portion 13 on the other side.

-The linear flow path molding dies 37 and 38 may be fixed to the base portion 48 by welding or by a locking mechanism that is inserted and turned.
The regulation pin 54 constituting the die-cutting mechanism may be fixed to the base portion 48, and the connecting member 52 may be formed with an elongated hole in which the regulation pin 54 is accommodated. Also in this case, the split dies 40 and 41 can be die-cut by the same operation as in the above embodiment.

As the U-shaped joint 11, the heating wire 20 is omitted, the heat-sealing portion 21 is heated and melted by a heating jig, and the resin pipe 17 is also heated and melted by a heating jig. It may be applied to a heat-sealed joint. Further, the heating wire 20 and the heat-sealing portion 21 may be omitted and applied to a U-shaped joint in which the end portions of the resin pipe 17 are connected by an adhesive. Further, instead of the heating wire 20 and the heat-sealing portion 21, it may be applied to a U-shaped joint provided with a screw member or a member constituting a one-push joint (one-touch joint).

The regulation pin 54 may be configured to be fixed to the base end portion of the connecting member 52.
The linear flow path molding die 86, the curved flow path molding die 87, and the connection flow path molding die 82, 83 have the axis n of the linear flow path molding die 86 with respect to the axis m of the connection flow path molding die 82, 83. It can also be arranged so as to be orthogonal.

-For example, in the second embodiment, the connecting member 91 may be omitted. In this case, the curved flow is utilized by utilizing the space formed between the linear flow path molding die 86 and the curved flow path molding die 87 when the linear flow path molding die 86 is retracted with respect to the outer peripheral portion molding die 79. A mechanism for rotating the path forming die 87 to cut out the die may be provided separately. Further, the same changes can be made to the first embodiment.

11 ... U-shaped joint, 15 ... straight flow path, 16 ... U-shaped flow path, 24 ... joint, 25, 79 ... outer peripheral molding die, 26, 80 ... flow path molding die, 27, 81 ... cavity, 37 ... 1st straight flow path molding die, 38 ... 2nd straight flow path molding die, 39 ... U-shaped flow path molding die, 40 ... 1st division type (curved flow path molding die), 41 ... 2nd split type (curved flow) Road forming mold), 46, 84 ... Engagement convex portion (misalignment prevention portion), 47, 85 ... Engagement concave portion (misalignment prevention portion), 48, 88 ... Base portion, 49, 89 ... Holding hole, 50, 90 ... Insertion hole, 52, 91 ... Connecting member, 53, 92 ... Rotating shaft, 54, 93 ... Regulatory pin (regulatory part), 55,94 ... Regulatory surface (regulatory part), 60, 95 ... Injection molded body, 71 ... Y-shaped joint, 74 ... connection flow path, 77 ... straight flow path, 78 ... curved flow path, 82, 83 ... connection flow path molding die, 86 ... straight flow path molding die, 87 ... curved flow path molding die, 96 ... Corner part.

Claims (2)

A joint having a straight flow path and a curved flow path having an inner diameter smaller than that of the straight flow path, which is connected to one end of the straight flow path and which is curved and extends with respect to the axis of the straight flow path, is injected. It is a fitting manufacturing equipment that is molded by molding.
An outer peripheral molding die for molding the outer peripheral portion of the joint,
A flow path molding die, which is arranged in the outer peripheral molding die and forms the linear flow path and the curved flow path, is provided.
A cavity into which the molten synthetic resin is injected is formed between the outer peripheral molding mold and the flow path molding mold.
The flow path molding die has a linear flow path molding die for molding the linear flow path and a curved flow path molding die for molding the curved flow path.
The curved flow path molding die is the linear flow path molding die and the curved flow path when the linear flow path molding die is retracted with respect to the outer peripheral portion molding die in order to cut out the linear flow path molding die. mold is configured stamped movable to and by utilizing the space formed along the die-cutting direction of the straight channel forming mold while being rotated between,
The joint has a step at the boundary between the straight flow path and the curved flow path, which defines the insertion position of the resin pipe by contact with the resin pipe.
The linear flow path molding mold molds only the linear flow path among the straight flow path and the curved flow path.
The curved flow path molding mold molds only the curved flow path of the straight flow path and the curved flow path.
The outer diameter of the linear flow path molding die is larger than the outer diameter of the curved flow path molding die.
The step of the joint is formed by the step formed by the boundary between the linear flow path molding die and the curved flow path molding die.
Fitting manufacturing equipment. A method for manufacturing a joint using the joint manufacturing apparatus according to claim 1 .
After arranging the flow path molding die in the outer peripheral molding die, the molten synthetic resin is injected into the cavity to form an injection molded body, and then the curved flow path molding die is rotated to rotate the outer peripheral portion. The joint is manufactured by extracting the flow path molding die from the partial molding die.
How to manufacture fittings.

Images