JP3019130B2 - Molding equipment for resin model for pipe port - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding a resin model for a pipe socket used when performing full-mold casting of a pipe.

[0002]

2. Description of the Related Art In casting a deformed pipe such as a curved pipe or a T-shaped pipe, a full mold casting method using a disappearing resin model corresponding to a product shape is used. This type of deformed tube is
Usually, one end of the main body of the tube has a socket for joining with another tube. Since this receiving port has a complicated shape on both the inner and outer circumferences, if it is attempted to mold the entire tube with a one-piece resin model, the structure of the molding die becomes extremely complicated and the demolding work becomes extremely difficult. .

[0003] For this reason, conventionally, in order to facilitate the production of the resin model, the main body portion and the receiving portion of the pipe are formed separately, and these are bonded to each other to produce the model. However, when the inner peripheral surface of the receiving portion has a complicated shape, if the receiving portion is formed between the cylindrical inner and outer dies, the demolding work becomes extremely difficult.
For this reason, conventionally, a pair of halves having a shape in which the receiving portion is divided into two halves is made so that the inner and outer dies can be removed by moving the inner and outer dies in a direction perpendicular to the axis, and these halves are bonded to each other. Manufactures models.

[0004]

However, when such a bonding step is included, the workability deteriorates by that much.
Further, if the bonding is not performed with high accuracy, there is a problem that the inner surface shape of the receiving port may be distorted, and various performances at the joint portion between the pipes may be reduced.

Accordingly, the present invention has been made to solve the above-mentioned problems, and has enabled a resin model of a receiving portion having a complicated inner surface shape to be molded with good workability and without causing distortion in the inner surface shape. The purpose is to:

[0006]

In order to achieve the above object, the present invention provides an outer mold for forming an outer peripheral surface of a resin model for a pipe receiving port, and a cylinder for forming an inner peripheral surface of the resin model. And the inner mold is divided into four in the circumferential direction,
It has a pair of 1st divided bodies and a pair of 2nd divided bodies which each mutually face in the radial direction, The said 1st divided body is
A first enlarged position where the resin model can be molded;
The radially inner side of the diameter-expanding position of the first diameter-expanding position and movable between a diameter-retraction retracted position deviated in the axial direction with respect to the first diameter-expanding position. The resin model can be positioned at a second enlarged position where the resin model can be molded, and after the first divided body has moved to the reduced diameter retract position, the second divided member is moved from the second enlarged position to the second enlarged position. It is configured to be movable toward a radially reduced position inward of the radially expanded position.

[0007]

According to this structure, the first and second divided bodies are positioned at the first and second enlarged diameter positions, respectively, to form an inner mold. The inner mold and the outer mold form a cylindrical shape. The outer peripheral surface and the inner peripheral surface of the resin model for pipe receiving are formed. When the resin model has been formed, the outer mold is first released, and then the first divided body is moved to the reduced diameter retracted position. At the reduced diameter retracted position, the first divided body is located radially inward of the first enlarged diameter position, and is also offset in the axial direction. Therefore, the first divided body is out of the moving path for reducing the diameter of the second divided body. As a result, the diameter of the second divided body is reduced without any problem, and the inner mold is released.

[0008]

FIG. 11 shows an example of a resin model 11 for manufacturing a deformed pipe such as a T-shaped pipe by a full mold casting method. This resin model 11 is formed of a foamed resin, and after the tube main body resin model 12 and the receiving port resin model 13 are formed separately,
They are configured to be bonded together. Although not shown, the tube body resin model 12 is formed in a T shape or a curved tube according to the type of the deformed tube to be manufactured. Resin model for socket
13 is formed in a cylindrical shape continuous in the circumferential direction, and has an outer peripheral surface 14 and an inner peripheral surface 15. An inner peripheral groove 16 having a complicated cross-sectional shape is formed on the inner peripheral surface 15.

Next, an apparatus for molding a resin model according to an embodiment of the present invention will be described in detail. In FIG. 1 to FIG. 10, reference numeral 20 denotes a container having a closed structure, in which a box-shaped frame 21 having a predetermined height is installed. Top of frame 21
An opening 23 is formed at the center of 22. A guide plate 24 is provided on the top plate 22. The guide plate 24 is formed in an annular shape having an opening 25 similar to the top plate 22, and an outer peripheral fitting portion 26 is formed on an upper portion thereof, and an inner peripheral fitting portion 27 is formed on an inner peripheral edge near the opening 25. Is formed. The upper end surface of the outer peripheral fitting portion 26 also functions as a mold for forming an end surface of the resin model 13 for a port.

Reference numeral 30 denotes a moving frame, which can be moved up and down by being attached to the lid side of the container 20 or the like.
The frame 21 can be approached from above. An outer mold 31 for forming the outer peripheral surface 14 of the receiving resin model 13 is attached to a lower portion of the moving frame 30. This outer mold 31
Has a structure that is continuous in the circumferential direction and a resin model
The portion corresponding to the opening end of the receiving port in 13 faces downward, and is disposed so that its axis is oriented in the vertical direction. As a result, the outer mold 31 is arranged so that the radial dimension of the inner peripheral surface thereof becomes gradually smaller toward the upper side. The outer die 31 has an outer fitting portion 26 fitted around the outer periphery of the guide plate 24 for centering, and a positioning fitting portion 32 applied to the upper surface of the guide plate 24 for positioning in the axial direction. Are formed. Further, a cylindrical auxiliary mold 33 is attached to the moving frame 30, and the auxiliary mold 33 is disposed concentrically inside the outer mold 31, and the resin model 12 for the pipe body in the resin model 13 for the receiving port. To form the inner peripheral surface of the joint. And auxiliary type 33
Is formed such that its outer diameter dimension is uniform along the length direction.

On the inner peripheral side of the outer mold 31, a cylindrical inner mold 35 for forming a space for molding the resin model 13 between the outer mold 31 and the outer mold 31 is disposed. With 35, the inner circumferential groove 16 of the inner circumferential surface 15 of the resin model 13 is formed.

The inner mold 35 is divided into four parts in the circumferential direction, and is composed of a pair of first divided bodies 36 and a pair of second divided bodies 37 that face each other in the radial direction. The first divided body 36 is formed to have a relatively narrow width, while the second divided body 36
The divided body 37 is formed relatively wide. Then, as shown in FIG. 5, the first divided body 36 and the second divided body
The contact surfaces 38, 39 at each end with 37
When the first and second divided bodies 36 and 39 are in contact with each other, the first divided body 36 is formed so as to be movable inward in the radial direction.

Brackets 41 are provided inside the frame 21 at positions corresponding to the respective first divided bodies 36. The parallel link 42 is supported by each bracket 41 so as to be swingable in the vertical direction and in the radial direction of the resin model 13, respectively.
The distal end of the working link 43 having the shape reaches the back side of the first divided body 36 through the openings 23 and 25, and is fixed to the first divided body 36.

That is, the parallel link 42 swings so as to move the first divided body 36 radially and vertically in the same posture, and as shown in FIG. 36, a resin model inside the outer mold 31 with this outer mold 31
13 can be held at a position where the mold can be expanded. In this expanded position, the first divided body 36 is positioned in the radial and axial directions to form the resin model 13 by the lower end edge thereof being in contact with the inner peripheral fitting portion 27 of the guide plate 24. Is done.

When the parallel link 42 swings radially inward and downward from the state shown in FIG. 1, as shown in FIG. Is also moved radially inward and to a reduced diameter retracted position deviated downward in the axial direction with respect to the expanded diameter position. For details,
In this retracted position, the first divided body 36 is
And enters the frame 21 and is retracted to a position where the resin model 13 does not overlap at all in the axial direction.

As shown in detail in FIGS. 9 and 10, one shaft 44 of each parallel link 42 is guided at its tip to the outside of the frame 21.
Gears 45 having the same requirements are attached. The frame 21 rotatably supports a pair of gears 46 that mesh with the gears 45, respectively.
It is configured so that the essential points are equal to each other.

A lever 48 is attached to a shaft 47 of one of the pair of gears 46 so as to be rotatable integrally with the gear 46, and an arm 49 is integrally formed on the base end side of the lever 48. Have been. On the shaft 50 of the other of the pair of gears 46, an arm 51 having the same length as the arm 49 and facing in the opposite direction is attached so as to be integrally rotatable. And arm 49,
51 are connected to each other by a rod 52.

Therefore, by manually swinging the lever 48, the gears 45 rotate through the gears 46 by the same angle in opposite directions, thereby simultaneously and similarly swinging the two parallel links 42. Thus, the pair of first divided bodies 36 can be simultaneously and similarly moved.

Similarly, brackets 54 are provided inside the frame 21 at positions corresponding to the respective second divided bodies 37, and the L-shaped operation links 56 of the parallel links 55 supported by the respective brackets 54 are provided. The tip of the opening 23, 25
And is fixed to the back side of the second divided body 36. The parallel link 55 is swingable within a range in which the operating link 56 is largely moved inward in the radial direction rather than vertically. For this reason, as shown in FIG.
A position where the lower end edge of the second divided body 37 is brought into contact with the inner peripheral fitting portion 27 of the guide plate 24 to perform positioning for forming the resin model 13 and, as shown in FIG. The second divided body 37 can be moved between a position where the divided body 37 is moved inward in the radial direction rather than the axial direction.

As shown in FIGS. 3 and 4, the radially inner links 58 constituting each parallel link 55 are connected to each other by L.
It is formed in such a shape that one ends thereof overlap each other at the center of the frame 21.
In this overlap portion, both links 58 are connected to each other by a pin 59 and a fork 60. Therefore, the two parallel links 55 swing in conjunction with each other.

As shown in FIGS. 9 and 10, one shaft 61 on one side of the parallel link 55
, And a lever 62 is attached to the tip of the shaft 61 so as to be integrally rotatable. Therefore, the pair of second divided bodies 37 can be simultaneously and similarly moved via the two parallel links 55 by swinging the lever 62 manually. Both levers 48 and 62 are arranged in a state of being completely housed inside the container 20 like other members.

Note that the lever 48 and the lever 48 are moved inward in the radial direction of the second divided body 37 after the first divided body 36 is moved to the retracted position shown in FIG. 62 operation order is decided. Also, the first and second divided bodies 36 and 37
However, as shown in FIGS. 1 and 3, when the inner mold 35 is formed at the position where the diameter of the resin model 13 can be molded and the inner mold 35 is formed, the auxiliary mold 33 is attached to the inner periphery of the upper end of the inner mold 35. The outer periphery of the lower end is in a state of being fitted inside. Therefore, when moving the divided bodies 36 and 37 from this state, the auxiliary mold 33 is
It has to be moved upward together with 31 to release this fit.

As shown in FIG. 1, a passage 66 for supplying resin beads 65 to a resin model forming space formed by the outer die 31 and the inner die 35 passes through the moving frame 30 and the outer die 31. It is provided. Reference numeral 67 denotes a supply pipe, which can switch between high-temperature steam and cooling water and supply it to the inside of the container 20. Reference numeral 68 denotes a nozzle, which is provided to eject the fluid in the supply pipe 65 toward the outer peripheral surface of the outer die 31 and the inner peripheral surface of the inner die 35.

In such a configuration, the resin model for the receiving port
In forming the 13, first, as shown in FIGS. 1 and 2, the diameter of the second divided body 37 is expanded through the parallel link 55 by operating the lever 62, and thereafter, by operating the lever 48. The diameter of the first divided body 36 is increased through the parallel link 42,
At these enlarged positions, the contact surfaces 38, 39 of the two divided bodies 36, 37 are brought into contact with each other, and their lower edges are brought into contact with the inner peripheral fitting portion 27 of the guide plate 24, and the radial and axial directions And the inner mold 35 is formed in a cylindrical shape as shown in the figure.

Then, the moving frame 30 is lowered to fit the positioning fitting portion 32 of the outer mold 31 to the outer fitting portion 26 of the guide plate 24, and the guide plate
The outer mold 31 is positioned in the radial direction so as to be concentric with the inner mold 35 by touching the upper surface of the mold 24, and is also positioned in the axial direction. In addition, the lower end of the auxiliary mold 33 enters the inner periphery of the upper end of the inner mold 35.

As a result, a resin model molding space is formed between the outer mold 31 and the inner mold 35 in a sealed state, and the resin beads are supplied into this space using the passage 66. Then, high-temperature steam is supplied into the container 20 from the supply pipe 67 and the nozzle 68, and the resin beads are melted. Then this time the nozzle
By supplying cooling water from 68, the molten resin is solidified and the resin model 13 is formed.

Next, the resin model 13 is released. At that time, the outer frame 31 and the auxiliary mold 33 are released from the mold by first raising the moving frame 30. Further, the lid of the container 20 is opened due to the rise of the moving frame 30, and the closed state of the inside of the container 20 is released and the container 20 is opened to the atmosphere.

Then, the user puts his hand into the container 20 and operates the lever 48 to swing the parallel link 42 radially inward and downward as shown in FIG. Then, the first divided body 36 is
As shown in FIG. 5, the resin model 13 is formed and is in contact with the inner peripheral groove 16 thereof, and the contact surface 38 is formed on the contact surface 39 of the second divided body 37.
Is moved inward and downward in the radial direction from the diameter-expanded position in contact with. Thereby, the first divided body 36 is separated from the resin model, and then passes through the radially innermost position shown in the imaginary line in FIG. 2 and FIG. Then, the solid line in FIG.
As shown in (1) and (2), the head again goes to the outside in the radial direction, but reaches the lower diameter retreat position on the lower side which is sufficiently far from the resin model 13 along the axial direction. In this position, the first divided body 36
Is substantially in the frame 21 and does not overlap the resin model 13, that is, the second divided body 37 at all in the axial direction.

Next, the lever 62 is operated to swing the parallel link 55 radially inward as shown in FIG. Then, as shown in FIG. 7, the second divided body 37 is formed in the inner circumferential groove of the resin model 13.
From the state in contact with 16, it moves radially inward and slightly downward as shown in FIGS. 4 and 8, and reaches the illustrated reduced diameter position. At this time, as described above, the first divided body
36 is away from the reduced diameter evacuation position, and this second divided body
There is no interference with the diameter reduction operation of 37.

Thus, the two divided bodies 36 and 37 are made of a resin model.
Since it is completely separated from the inner peripheral surface of 13 and the resin model 13 is just on the guide plate 24,
This can be easily taken out of the container 20.

[0031]

As described above, according to the present invention, the inner mold for forming the inner peripheral surface of the resin model for a pipe socket is constituted by a pair of first and second divided bodies. The first and second divided bodies are moved from the expanded position where the resin model can be molded.
Since the first divided body can be moved to a position reduced in diameter inward in the radial direction from the expanded position and the first divided body can be moved to a reduced diameter retracted position deviated in the axial direction from the expanded position. 1
Can be separated inward from the inner surface of the resin model, and the second divided member can also be separated inward from the inner surface of the resin model without being interfered by the first divided member in the reduced diameter state. This makes it possible to form the resin model of the receptacle part having a complicated inner surface shape into a continuous annular shape in the circumferential direction, eliminating the need for a bonding step as in the case where the model is divided into two vertically. In addition to being able to manufacture the resin model efficiently, it is possible to prevent the inner shape of the resin model from being distorted due to bonding.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an apparatus for molding a resin model for a pipe receiving port according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same portion as FIG. 1 for explaining an operation state of the device.

FIG. 3 is a sectional view showing another section of the device.

FIG. 4 is a cross-sectional view of the same portion as FIG. 3 for explaining an operation state of the device.

FIG. 5 is a sectional view showing an operation state of the device.

FIG. 6 is a cross-sectional view showing an operation state of a next stage of FIG. 5;

FIG. 7 is a cross-sectional view showing an operation state of the next stage of FIG. 6;

FIG. 8 is a cross-sectional view showing an operation state of the next stage of FIG. 7;

FIG. 9 is a cross-sectional view of a main part of the device in plan view.

FIG. 10 is a side view of a main part of the device.

FIG. 11 is a cross-sectional view illustrating an example of a resin model manufactured by the apparatus of the present invention.

[Explanation of symbols]

 13 Resin model for pipe socket 14 Outer peripheral surface 15 Inner peripheral surface 16 Inner peripheral groove 31 Outer die 35 Inner die 36 First split body 37 Second split body 42 Parallel link 55 Parallel link

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22C 7 / 02,9 / 04

Claims (1)

(57) [Claims] 1. An outer mold for forming an outer peripheral surface of a resin model for a pipe receiving port, and a cylindrical inner mold for forming an inner peripheral surface of the resin model. It is divided into four parts in the circumferential direction, and has a pair of first divided bodies and a pair of second divided bodies that face each other in the radial direction, and the first divided body is a third part that can mold the resin model. 1 and a diametrically retracted position radially inward of the first enlarged position and axially deviated from the first enlarged position. The second divided body can be positioned at a second enlarged diameter position at which the resin model can be molded, and after the first divided body has moved to the reduced diameter retract position, the second divided body can be positioned at the second enlarged diameter position. Is configured to be movable from the radially expanded position to a radially inner reduced diameter position relative to the second radially expanded position. A molding device for a resin model for a pipe receiving port.