JP3593147B2 - Mold for forming pipe fittings - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to, for example, a mold for molding a pipe joint used in a drainage basin or the like.
[0002]
[Prior art]
As a conventional mold for molding this type of pipe joint, for example, one described in Japanese Utility Model Publication No. 3-47856 as shown in FIG. 9 is known.
[0003]
Is with this arrangement, at least a pair of the catch basin 1 as the synthetic resin pipe joint is vertically into each connected to the axis 2a of the inspection opening 2 a cylindrical central portion of the as shown in FIG. 10 It is formed to have a tubular outflow-side receiving port 3 and an inflow-side receiving port 4. The outflow-side receiving portion 3 and the inflow-side receiving portion 4 are connected such that the pipe axes 3a and 4a exhibit a predetermined bending angle A in the same plane.
[0004]
That is, in FIG. 9, this molding die is divided into outer molds 5 and 6 having mold surface shapes corresponding to the outer surface shape of the drainage basin 1, and the inner surface shape of the tubular outlet side receiving port portion 3. An inner mold 7 having a mold surface shape corresponding to the above, an inner mold 8 having a mold surface shape corresponding to the inner surface shape of the tubular outflow port 4, and a mold corresponding to the inner surface shape of the inspection port 2. It is mainly composed of an inner mold 9 having a surface shape, a shaft 10 for rotatably supporting the inner mold 9 and the like.
[0005]
Then, according to the type of the drainage basin 1 to be formed, the surrounding inner die 9 is rotated around the shaft rod 10 to form by changing the angle B of the axis 2a with respect to the pipe axes 3a and 4a. ing.
[0006]
[Problems to be solved by the invention]
However, in such a mold for forming a pipe joint, the bending angle A of the pipe axis 4 a of the inflow-side receiving port 4 with respect to the pipe axis 3 a of the outflow-side receiving port 3 is one set from the outer die 5 to the shaft 10. The mold is fixed at a predetermined angle.
[0007]
When this apparatus is used to form several types of drainage basins 1 (including right-turn and left-turn) having different angles A, all sets from the outer die 5 to the shaft 10 are exchanged for one having a different angle A. It was difficult to say that the work efficiency was good.
[0008]
In addition, in this mold for molding a pipe joint, the shape of the outflow-side receiving portion 3 and the inflow-side receiving portion 4 has, for example, a rubber ring receiving portion 4b as shown in FIG. Various types of drainage basins 1 having various shapes, diameters, and lengths are produced.
[0009]
As described above, even when the shape of a part of the inflow-side receiving port portion 4 is changed, all the parts from the outer die 5 to the shaft 10 must be exchanged, and it is difficult to say that the working efficiency is good.
[0010]
In view of the above, the present invention provides a pipe joint that can freely change the connection angle between the outflow-side receiving portion and the inflow-side receiving portion, and has a partially different shape or the like of the outflow-side receiving portion or the inflow-side receiving portion. Another object of the present invention is to provide a mold for forming a pipe joint suitable for low-volume, high-mix, low-volume production that can be efficiently replaced.
[0011]
[Means for Solving the Problems]
The problems as those described in claim 1 of the present invention for solving the tube having at least the outflow and inflow side socket portion of the pair of tubular to be vertically into each connected to the axis of the cylindrical central portion of the In the joint molding die,
An outflow side receiving portion forming mold forming the outflow side receiving portion, and the inflow side receiving portion forming mold forming the inflow side receiving portion, the outflow side receiving portion forming die, and an inflow side The receiving part forming mold is a pipe which is disposed so as to be circumferentially movable around the center part along the circumference and changes the connection molding position of the inflow side receiving part and the outflow side receiving part to the center part. It features a mold for molding joints.
[0012]
According to the second aspect of the present invention, the outflow-side receiving portion molding die is arranged in a fan shape around a cavity for molding the central portion of the cylindrical shape. 2. The mold for molding a pipe joint according to claim 1, wherein said mold is provided in one of said plurality of blocks, and said inflow-side receiving portion forming mold is provided in another of said plurality of blocks.
[0013]
[Operation]
According to the configuration of claim 1 having such a configuration, when the outflow-side receiving portion forming die or the inflow-side receiving portion forming die is moved around the circumference around the center of the cylindrical shape, At the time of molding, the connection molding positions of the inflow-side receiving portion and the outflow-side receiving portion to the central portion are changed, so that pipe joints having various types of connection angles can be molded by one molding die.
[0014]
According to the second aspect of the present invention, the outflow-side receiving portion forming die is provided in one of the blocks disposed around the cavity for forming the cylindrical central portion, and the other one of the blocks is provided in the other portion. Since the inflow-side receiving portion forming mold is provided in the block, the connection molding position of the inflow-side receiving portion and the outflow-side receiving portion to the center portion at the time of molding is changed only by replacing these blocks, and various types are provided. Can be molded with one molding die.
[0015]
Further, for example, if the outflow-side receiving die or the inflow-side receiving die having different shapes and sizes is provided in the block, only the blocks that need to be changed are replaced according to the type of the fitting. And can be molded.
[0016]
【Example】
Hereinafter, specific examples of the present invention will be described with reference to the drawings.
[0017]
1 to 8 show an embodiment of the present invention. The same or equivalent parts as those in the conventional example are denoted by the same reference numerals.
[0018]
First, the structure of a molded product will be described. In the figure, reference numeral 11 denotes a drainage tub as a synthetic resin pipe joint of this embodiment, which is configured in substantially the same manner as the drainage tub 1 shown in FIG. to the axis 2a of the inspection opening 2 is the central part of which intended to be formed with at least a pair of the outlet side socket portion 3 and the inlet-side socket portion 4 of the tubular to be vertically into each connection.
[0019]
The outlet port 3 and the inlet port 4 are formed by connecting the pipe axes 3a, 4a at a predetermined bending angle A in the same plane.
[0020]
In FIG. 1, a mold body 12 for injection-molding the drainage basin 11 mainly includes a fixed base 12a, a movable cavity 12d movable in a vertical direction with respect to the base, and the cylindrical base 12a. An inner cavity 13 which has a mold surface shape corresponding to the inner surface shape of the inspection port 2 which is a central portion and which can be inserted and removed in the vertical direction, an outer cavity 14 disposed around the inner cavity 13, and an outer cavity 14 Are mainly constituted by fixing members 12e to 12h and the like for fixing the members at predetermined positions during injection molding.
[0021]
The inner cavity 13 has replaceable inner forming pieces 13a and 13b corresponding to the connection portions of the inspection port 2 with the outflow-side receiving port 3 and the inflow-side receiving port 4, and has an inner surface shape of the inspection port 2. Replaceable inner forming pieces 13c to 13e having a corresponding mold surface shape are provided.
[0022]
The outer cavity 14 mainly includes a plurality of replaceable blocks 15a to 15e arranged in a fan shape around the inner cavity 13, and is placed and fixed on the base 12a. .
[0023]
The block 15a is provided with an outflow-side receiving-port-portion forming die 16 that forms the outflow-side receiving portion 3. The outflow side receiving portion molding die 16 has a mold surface shape corresponding to the outer surface shape of the tubular outflow side receiving portion 3, and outer dies 16a and 16b which can be divided and moved in the vertical direction, and the outflow side receiving portion. 3 has an inner surface shape corresponding to the inner surface shape, and is mainly constituted by an inner die 16c which can be inserted and withdrawn by a hydraulic cylinder along the axis 3a.
[0024]
A rotating piece 19 is rotatably supported on the inner die 16c about a shaft 19a. The rotating piece 19 is connected to the inspection port 2 and the outlet port 3 at the time of injection molding. It is formed so as to be in contact with the inside and rotate so as to separate from the molded product during insertion and removal.
[0025]
As shown in FIG. 2, the block 15a has a 90 ° fan-shaped shape extending around the axis 2a of the inspection port 2 formed by the inner cavity 13, and has a circumferential shape formed on the base 12a. It is formed so as to be able to move circumferentially along the rail 12b.
[0026]
Further, the block 15b is provided with an outflow-side receiving-port-portion-forming die 17 that forms the tubular outflow-side receiving-port portion 4. The outflow-side receiving portion forming die 17 has a mold surface shape corresponding to the outer shape of the tubular inflow-side receiving portion 4, and includes outer dies 17a and 17b which can be divided and moved in the vertical direction, and the inflow-side receiving portion. 4 has an inner surface shape corresponding to the inner surface shape, and is mainly constituted by an inner die 17c which can be inserted and removed by a hydraulic cylinder along the axis 4a.
[0027]
The outer dies 17a and 17b and the inner die 17c are formed with rubber ring receiving port forming portions 18 so that the rubber ring receiving port portions 4b are expanded and formed in the inflow side receiving port portion 4 during injection molding. ing.
[0028]
A rotating piece 19 is rotatably supported on the inner mold 17c about a shaft 19a, and connects the inspection port 2 to the inflow-side receiving port 4 during injection molding. And is formed so as to be in contact with the inside from inside, and to rotate and separate from the molded product at the time of insertion and removal.
[0029]
As shown in FIG. 2, the block 15b has a 90-degree sector shape extending around the axis 2a of the inspection port 2 formed by the inner cavity 13, and has a circumferential shape formed on the base 12a. It is formed so as to be able to move circumferentially along the rail 12b.
[0030]
Each of the blocks 15c, 15d, and 15e has a fan shape of 60 °, 15 °, and 105 ° that spreads around the axis 2a of the inspection port 2 formed by the inner cavity 13 as shown in FIG. And is formed so as to be able to move circumferentially along a circumferential rail 12b formed on the base 12a, and is also capable of being vertically divided and moved with the movement of the inner cavity 13. It is configured as follows.
[0031]
Then, all the blocks 15a to 15e are arranged around the inspection port 2 formed by the inner cavity 13 without any gap around the block, thereby closing the space where the molten resin is injected.
[0032]
Further, around the inner cavity 13, as shown in FIG. 1, the outer dies 16a, 17a and the like of the blocks 15a to 15e are separated and moved in the vertical direction, and then the formed drainage tub 11 is pushed downward. Is disposed so as to be movable in the vertical direction.
[0033]
Next, the operation of this embodiment will be described. In this embodiment, when the outflow-side receiving portion forming die 16 is moved along the circumference on the rail 12b around the inner cavity 13 forming the inspection port 2 which is a cylindrical central portion. In addition, the connection molding position of the outflow-side receiving portion 3 to the inspection port 2 at the time of molding is changed, so that the drainage basin 11 having various types of connection angles can be molded by one molding die.
[0034]
For example, as shown in FIG. 2, if the blocks 15 c and 15 d and 15 e are interposed between the blocks 15 a and 15 b and the periphery of the inner cavity 13 is closed, the pipe axis can be reduced. The bending angle A between 4a and 3a is 15 ° to the right.
[0035]
Next, as shown in FIG. 3, the block 15d is moved between the blocks 15b and 15e as indicated by a large arrow, and the block 15b is rotated counterclockwise as indicated by a small arrow. 12b, the connection molding position of the outflow-side receiving portion 3 to the inspection port 2 at the time of molding changes, and the bending angle A between the pipe axes 4a and 3a becomes 30 degrees to the right. °.
[0036]
For this reason, when forming the drainage basin 11 in which the connection angle of the outflow-side receptacle 3 and the inflow-side receptacle 4 with respect to the inspection port 2 is different as in the related art, all the molds have to be replaced. The efficiency of replacement work is improved as compared with that of the above, and it is suitable for use in high-mix low-volume production.
[0037]
After the injection molding, the rotating pieces 19, 19 provided on the inner dies 16c, 17c do not come into contact with the connecting portions 3, 4 inside the inspection port 2 around the rotating shafts 19a, 19a. To rotate.
[0038]
Next, the inner dies 16c, 17c are pulled out along the tube axes 3a, 4a, and the outer dies 16a, 17a, etc. are raised vertically together with the inner cavities 13 to move separately from the outer cavities 16b, 17b, etc.
[0039]
Then, the extrusion sleeve 12c pushes the injection-molded drainage basin 11 downward, thereby completing the molding process.
[0040]
In addition, in FIG. 3, at the position of the outflow-side receiving portion forming die 16 indicated by the two-dot chain line, the bending angle A between the pipe axes 4a and 3a is 30 ° to the left. . In the following, description will be made using a case where the bending angle A between the tube axes 4a and 3a is rightward. However, a case where the bending angle A is leftward can be realized by symmetrically configuring.
[0041]
Next, a configuration of a modification of this embodiment will be described with reference to FIGS.
[0042]
In this modified example, instead of the block 15a, a block 15f that forms a drainage basin 111 with improved water transfer by decentering the pipe axis 4a of the inflow-side receiving port 4 outward by a predetermined distance B is replaced with the block 15b. In place of the above, blocks 15g in which the pipe axis 3a of the B-outflow port 3 is decentered outward are mounted on the base 12 in the same manner.
[0043]
Each of the block 15f and the block 15g has a fan shape of 120 ° that spreads around the axis 2a of the inspection port 2 formed by the inner cavity 13, and is a circumferential rail formed on the base 12a. It is formed so as to be able to move circumferentially along 12b.
[0044]
Between the block 15f and one of the blocks 15g, a 15 ° and 30 ° fan-shaped shape extending around the axis 2a of the inspection port 2 is provided, and a circumferential shape formed on the base 12a is formed. Blocks 15h and 15i formed so as to be able to move circumferentially along the rail 12b.
[0045]
Further, between the block 15f and the other of the block 15g, a 75 ° fan-shaped shape spreading around the axis 2a of the inspection port 2 is provided, and a circumferential shape formed on the base 12a is formed. A block 15j formed so as to be able to move circumferentially along the rail 12b is provided.
[0046]
The inner cavity 13 has replaceable inner forming pieces 13f and 13g corresponding to a connection portion between the inspection port 2 and the outflow-side reception port 3 and the inflow-side reception port 4, and has an inner surface shape of the inspection port 2. Exchangeable inner forming pieces 13h to 13j exhibiting corresponding mold surface shapes are provided. Other configurations are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.
[0047]
Next, the operation of this modified example will be described.
[0048]
First, from the state shown in FIG. 3 of the embodiment, the blocks 15a to 15e are replaced with the blocks 15f to 15j, and the inner forming pieces 13a to 13j are replaced in correspondence with each other. The connection molding position of the receiving part 4 and the outflow-side receiving part 3 is changed from 30 ° to 45 °, so that pipe joints having various kinds of connecting angles can be formed by one forming die.
[0049]
In addition, even when the connection angle A is large, the outflow-side receiving port mold 17 and the inflow-side receiving port mold 16 in which the pipe axis for improving water transfer is eccentric to the outside are provided in the blocks 15f and 16g. Therefore, only the blocks 15f and 15g can be replaced and molded.
[0050]
For this reason, for example, if the outflow-side receiving port mold 17 or the inflow-side receiving port mold 16 having different shapes, diameters, and lengths is provided in the blocks 15f and 15g, the type of the pipe joint is increased. Correspondingly, only the blocks 15f and 15g which need to be changed can be replaced, and the replacement workability is further improved.
[0051]
Next, as shown in FIG. 4, from the state where the bending angle A between the pipe axes 4a and 3a is 45 ° to the right, as shown in FIG. 5, this block 15h is replaced with the blocks 15g and 15e. Then, as shown by a large arrow, the block 15g is slid circumferentially on the rail 12b counterclockwise as shown by a small arrow. Due to this movement, the connection molding position of the outflow-side receiving port portion 3 to the inspection port 2 at the time of molding changes, and the bending angle A between the pipe axes 4a and 3a becomes 60 ° to the right.
[0052]
Then, as shown in FIG. 6, the block 15i is moved between the blocks 15g and 15j as shown by a large arrow, and the block 15h is moved between the blocks 15g and 15f to form a block 15g. Is slid circumferentially on the rail 12b counterclockwise as shown by a small arrow.
[0053]
Due to this movement, the connection molding position of the outflow-side receiving port portion 3 to the inspection port 2 at the time of molding changes, and the bending angle A between the pipe axes 4a and 3a becomes 75 ° to the right.
[0054]
Further, as shown in FIG. 7, the block 15h is moved between the blocks 15g and 15 as shown by a large arrow, and the block 15g is moved counterclockwise as shown by a small arrow to rotate the rail 12b. It slides around the top and moves.
[0055]
Due to this movement, the connection molding position of the outflow-side receiving port 3 to the inspection port 2 at the time of molding changes, and the bending angle A between the pipe axes 4a and 3a becomes 90 ° to the right.
[0056]
For this reason, when forming the drainage basin 11 in which the connection angle of the outflow-side receptacle 3 and the inflow-side receptacle 4 with respect to the inspection port 2 is different as in the related art, all the molds have to be replaced. The efficiency of replacement work is improved as compared with that of the above, and it is suitable for use in high-mix low-volume production.
[0057]
In addition, the outflow-side receiving portion forming die 17 is provided in a block 15g disposed around the inner cavity 13 for molding the cylindrical inspection port 2, and the inflow-side receiving portion is provided in another block 15f. Since the molding die 16 is provided, the connection molding positions of the inflow-side receiving portion 4 and the outflow-side receiving portion 3 to the inspection port 2 are changed at the time of molding only by replacing the other blocks 15h to 15j. Can be molded with one molding die.
[0058]
For this reason, the efficiency of the replacement operation is further improved, and it is suitable for use in high-mix low-volume production.
[0059]
Moreover, in this embodiment, the relatively heavy block 15g provided with the outflow-side receiving-port forming die 17 slides circumferentially on the rail 12b to form the outflow-side receiving portion 3. Since the connection angle can be changed, the amount of work at the time of replacement is small.
[0060]
Other configurations and operations are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.
[0061]
FIG. 8 shows another embodiment of the present invention.
[0062]
In the mold 112 for forming a pipe joint according to this embodiment, a straight port having a larger diameter than the rubber ring port 4b can be formed around the inner mold 17c forming the inlet port 4. Receptacle forming nest 113 is removably provided.
[0063]
In addition, around the inner die 16c forming the outflow-side receiving portion 3, a straight receiving-portion forming nest 114 capable of forming a straight receiving opening having a diameter larger than that of the straight receiving opening is detachably provided. I have.
[0064]
In the inner cavity 115 for forming the inspection port 2 of this embodiment, as shown on the right side of the pipe axis 2a in FIG. 8, a rubber ring receiving port forming bulging portion 115a is previously formed for forming a rubber ring receiving port. Around the inner cavity 115, a straight receptacle forming insert 116 that can form a straight receptacle larger in diameter than the rubber ring receptacle is detachably disposed.
[0065]
In this embodiment configured as described above, the inserts 113, 114, and 116 are attached to and detached from the inner dies 17c and 16c and the inner cavity 115, so that the inspection ports 2 having different shapes and different diameters are provided. , And the inflow and outflow side receiving ports 3 and 4 can be formed in the drainage basin 211.
[0066]
In FIG. 8, as shown on the left side of the pipe axis 2a, the inner cavity 115 for forming the inspection port 2 is processed in advance for forming the straight receiving port, and the insert 117 for forming the large diameter straight receiving port is inserted into the inner cavity 115. You may comprise so that it may be detachably provided around 115.
[0067]
Other configurations and operations are substantially the same as those in the above-described embodiment and modified examples, and thus description thereof is omitted.
[0068]
Although the embodiments and modifications of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments and modifications, and there may be design changes and the like without departing from the gist of the invention. Even this is included in the present invention.
[0069]
For example, in the above-described embodiment, the blocks 15a and 15f provided with the inflow-side receiving portion forming die 17 are substantially fixed to the mold main bodies 12 and 112. However, the present invention is not limited to this. The molding die 17 may be slid circumferentially along the rail 12b.
[0070]
Further, in the above-mentioned modified example, in order to improve the flowability, since the bending angle A between the pipe axes 3a and 4a is 45 ° or more, the pipe axis is decentered by a certain amount b. However, the present invention is not particularly limited to this. For example, it is not necessary to perform eccentricity, and the pipe diameter and length, such as which bending angle A to use the block 15f or 15g and how to set the eccentricity B, etc. Any setting may be made in consideration of the above.
[0071]
The number of the inflow-side receptacles 4 and the number of the outflow-side receptacles 3 are not particularly limited to the above-described embodiment, and a plurality of blocks 15a and the like may be provided so as to be provided in plurality.
[0072]
Further, in each of the above embodiments, the drainage tubs 11 and 111 have been described as pipe fittings. However, for example, a bent molded product such as a bent pipe or any injection molded product may be used. is there.
[0073]
Also, each of the fan-shaped angles 15 ° to 120 ° of the blocks 15a to 15j is not limited to each of the above-described embodiments and modified examples, and may be set in any manner.
[0074]
【The invention's effect】
As described above, according to the first aspect of the present invention, the outflow-side receiving portion forming die or the inflow-side receiving portion forming die is formed around the center of the cylindrical shape along the circumference. When it moves circumferentially, the connection molding position of the inflow-side receiving portion and the outflow-side receiving portion to the center portion at the time of molding changes, and it is possible to mold pipe joints having various types of connection angles with one molding die. I can do it.
[0075]
For this reason, when forming a pipe joint having a different connection angle with respect to the central portion between the outflow-side receiving portion and the inflow-side receiving portion as in the related art, it is necessary to replace all the molds as compared with the case where all the molds have to be replaced. It improves work efficiency and is suitable for use in high-mix low-volume production.
[0076]
According to the second aspect of the present invention, the outflow-side receiving portion forming die is provided in one of the blocks disposed around the cavity for forming the cylindrical central portion, and the other one of the blocks is provided in the other portion. Since the inflow-side receiving portion forming mold is provided in the block, the connection molding position of the inflow-side receiving portion and the outflow-side receiving portion to the center portion at the time of molding is changed only by replacing these blocks, and various types are provided. Can be molded with one molding die.
[0077]
For this reason, the efficiency of the replacement operation is further improved, and it is suitable for use in high-mix low-volume production.
[0078]
Further, for example, if the outflow-side receiving die or the inflow-side receiving die having different shapes and sizes is provided in the block, only the blocks that need to be changed are replaced according to the type of the fitting. And can be molded.
[0079]
For this reason, when forming a pipe joint in which the shape of the outflow-side receiving portion or the inflow-side receiving portion is partially different from the conventional case, the change is made in comparison with the case where all the molds have to be replaced. Since only a certain block needs to be replaced, the efficiency of the replacement operation is improved, and a practically useful effect that a suitable mold for forming a pipe joint used in high-mix low-volume production can be provided is exhibited. .
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view illustrating a molding die of a pipe joint according to an embodiment of the present invention and illustrating a configuration of a main part.
FIG. 2 is a horizontal sectional view illustrating a mold for molding a pipe joint of the same embodiment.
FIG. 3 is a horizontal sectional view illustrating a mold for molding a pipe joint of the same embodiment.
FIG. 4 is a horizontal sectional view illustrating a mold for molding a pipe joint according to a modification.
FIG. 5 is a horizontal sectional view illustrating a mold for molding a pipe joint according to a modification.
FIG. 6 is a horizontal sectional view illustrating a mold for molding a pipe joint according to a modification.
FIG. 7 is a horizontal cross-sectional view illustrating a mold for molding a pipe joint according to a modification.
FIG. 8 is a vertical sectional view showing a mold for molding a pipe joint according to another embodiment.
FIG. 9 is a vertical sectional view showing a conventional mold for molding a pipe joint.
FIG. 10 is a perspective view showing a drainage basin as a conventional pipe joint.
[Explanation of symbols]
2 Inspection port (central part)
3 Outlet-side receptacle 4 Inlet-side receptacle 11, 111, 211 Drainage basin (pipe joint)
15a to 15j Block 16 Outflow side receiving port forming die 17 Inflow side receiving port forming die

Claims (2)

In at least mold of a pipe joint having outflow and inflow side socket portion of the pair of tubular to be vertically into each connected to the axis of the cylindrical central portion of,
An outflow-side receiving portion forming mold for forming the outflow-side receiving portion, and an inflow-side receiving portion forming mold for forming the inflow-side receiving portion; The receiving part molding die is disposed so as to be circumferentially movable around the center part along the circumference and changes the connection molding position of the inflow side receiving part and the outflow side receiving part to the central part. A molding die for a pipe joint, characterized by the following. The outflow-side receiving portion molding die is arranged in a fan shape around a cavity for molding the cylindrical central portion, and is provided in one of a plurality of replaceable blocks, and the inflow-side receiving portion is provided. The molding die according to claim 1, wherein a molding die is provided in another of the plurality of blocks.

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