JP3782172B2 - Flexible tube manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for manufacturing a flexible tube having a plurality of annular protrusions having a corrugated axial cross section on the outer periphery thereof.
[0002]
[Prior art]
Since various vibrations such as vibrations due to the influence of internal flow and vibrations from the outside are generated in the piping system for transporting various fluids, damage to the piping and support caused by these vibrations can occur. It is necessary to take measures to prevent this, and as one of these types of measures, a configuration in which a flexible tube is interposed in the middle of the piping system to absorb the bending of the piping system due to the vibration is widely adopted. ing.
[0003]
One of the flexible tubes used for such a purpose is a plurality of annular projections 10 and 10 having a corrugated axial section by bending the circumferential wall of a metal tube having a circular tube shape as shown in FIG. There is a flexible tube 1 in which ... are formed at appropriate pitches in the axial direction. The flexible tube 1 is formed by connecting the ends of the tubular portions 11 and 11 having appropriate lengths left on both sides of the formation region of the annular protrusions 10, 10 to other pipes by appropriate means such as welding or flange connection. Each of the annular projections 10, 10 ... is deformed so as to increase or decrease the width of the base portion when the force in various directions intersecting with the shaft is applied. It acts to absorb the bending in the direction of action.
[0004]
The flexible tube 1 as described above is generally manufactured according to the procedure shown in FIGS. 7 to 9 using a mold 7 shown in FIG. The mold 7 is a rectangular flat plate having a circular hole 70 penetrating the shaft center portion, and is configured as a split mold that includes the center of the circular hole 70 and can be divided into two by a split surface 71 along one side of the rectangle.
[0005]
6A shows the separated state of the mold 7, and FIG. 6B shows the assembled state of the mold 7. As shown in FIG. 6A, the semicircular shape is formed under the separation. On the inner peripheral surface of the circular hole 70, a convex strip 72 having a corrugated axial cross section is formed by cutting both sides in the thickness direction into a large diameter and projecting the central portion inward. Is continuous over the entire circumference of the inner surface of the circular hole 70 in the aligned state shown in FIG.
[0006]
In the production of the flexible tube 1, as shown in FIGS. 7 to 9, the above-mentioned molds 7 are prepared in the required number (here, five) of the annular protrusions 10, 10,... An apparatus is used in which a pair of press heads 8 and 8 are arranged opposite to each other at the predetermined intervals and coaxially with both of them on both sides of the arrangement direction.
[0007]
In the figure, the molds 7, 7... Are shown as cross sections orthogonal to the respective split surfaces 71, 71. In manufacturing the flexible tube 1, first, a material tube S, which is a thin metal tube, is supported between the press heads 8, 8, and the circular holes 70, 70... Of each die 7, 7. By positioning the molds 7 and the molds 7, 7... Together, the material tube S was inserted into the circular holes 70, 70... Of the molds 7, 7. State. At this time, the material tube S is formed on the inner surfaces of the circular holes 70, 70 ... of the molds 7, 7 ..., more specifically, the ridges 72, 72 ... provided around the inner surfaces of the circular holes 70, 70 ... A plurality of positions in the axial length direction are gripped from the outside by the end edges of.
[0008]
The press heads 8 and 8 can be moved toward and away from each other by the operation of a molding cylinder (not shown), and one press head 8 has a hydraulic pressure inlet 80 connected to a hydraulic pressure source (not shown). Have. The material tube S supported between the press heads 8 and 8 as described above makes the press heads 8 and 8 approach each other while introducing the hydraulic pressure (generally water pressure) inward from the hydraulic pressure inlet 80. The flexible tube 1 is molded by applying a compressive force in the long direction.
[0009]
In the above-described molding process, the peripheral wall of the material tube S bulges outward between the gripping portions of the molds 7, 7, as shown in FIG. FIG. 9 shows a state in which the bulge is deformed by the compression between the press heads 8 and 8 performed in a state, and the molds 7 and 7 are finally overlapped in the axial direction. As described above, a plurality of (four in the figure) annular protrusions 10, 10... Corresponding to the respective grooves are deformed so as to be pressed against the inner surface of the groove formed between the respective protrusions 72, 72. The provided flexible tube 1 is formed. The obtained flexible tube 1 can be taken out by separating the dies 7, 7, and separating the press heads 8, 8.
[0010]
[Problems to be solved by the invention]
When the flexible tube 1 is manufactured as described above, the molds 7, 7,. Since a split mold that can be separated into a plurality of pieces is unavoidable, a means for preventing separation at the split faces 71, 71... Due to the action of hydraulic pressure introduced inside the material tube S is required.
[0011]
Therefore, in the prior art, as shown in FIGS. 7 to 9, pressure receiving blocks 9 and 9 are provided which collectively support both side edges parallel to the respective split surfaces 72, 72. The pressure receiving blocks 9, 9 are configured to prevent the molds 7, 7, ... from being separated during molding. However, in the case of such a configuration, the pressure receiving blocks 9, 9 that collectively restrain the plurality of molds 7, 7... Are bulky, and the molds 7, 7. Since a large-capacity cylinder is required as an open / close cylinder to be operated, there is a problem that an increase in the size of the apparatus including the support frame that supports these cylinders is inevitable.
[0012]
Further, when the material tube S is compressed by the operation of the press heads 8 and 8 in the above-described molding process, the molds 7 are overlapped in the axial length direction as shown in FIG. In the conventional configuration in which these molds 7, 7... Are supported by the pressure receiving blocks 9, 9, the movement of the molds 7, 7. Since this occurs with sliding contact with the pressure receiving blocks 9, 9 pressed against the side edges, there is a high possibility that the molds 7, 7,... There is an inconvenience that a poor-looking flexible tube 1 in which some of the plurality of annular protrusions 10, 10...
[0013]
In order to eliminate such inconvenience, conventionally, as shown in FIGS. 7 to 9, a sliding plate 90 made of a material having a low friction coefficient is provided on the contact surface of the pressure receiving blocks 9, 9 with the molds 7, 7,. The structure is designed to reduce the sliding resistance. However, even in this configuration, it is difficult to completely prevent the molds 7, 7... From tilting, and it is difficult to obtain a high-quality flexible tube 1.
[0014]
The present invention has been made in view of such circumstances. Separation of the mold at the time of molding can be reliably prevented without using a bulky pressure receiving block configured separately from these, and the mold can be divided at the time of molding. An object of the present invention is to provide a miniaturized flexible tube manufacturing apparatus that can effectively prevent mold collapse and stably manufacture a high-quality flexible tube.
[0015]
[Means for Solving the Problems]
The apparatus for manufacturing a flexible tube according to the present invention includes a plurality of molds configured as a split mold in which a convex line having a corrugated axial section is provided around the inner surface of a circular hole that passes through an axial center portion, and coaxially at predetermined intervals. A compressive force in the axial length direction is applied to the material tubes inserted in parallel in each circular hole while introducing a hydraulic pressure inside the material tubes, so that the convexity of each die on the outer periphery of the material tube is applied. In a flexible tube manufacturing apparatus that molds a corrugated annular projection on a portion sandwiched between strips, the mold includes a disk-shaped inner mold having the circular hole at the center thereof, and an axis around the inner mold. And an outer mold that holds the inner mold in a freely rotatable manner, applying a rotational force to the inner mold of each mold in a lump, and an alignment position where these split faces and the split faces of the respective outer molds are aligned, Also provided with an inner mold rotating means for rotating between molding positions that are not aligned with each other To.
[0016]
In the present invention, a plurality of molds used in the manufacture of a flexible tube are divided into a disk-shaped inner mold having a molding hole at its axial center, and an outer mold for holding it rotatably around the axis. Prior to molding performed in a state where the material tube is inserted through the circular hole by combining them, the inner mold is rotated by the inner mold rotating means, and the inner mold and the outer mold are combined. There is no molding position where the split surfaces do not match, and in this state, hydraulic pressure is introduced inside the material tube. At this time, the force applied to the inner mold so that the split surface is separated by the action of the hydraulic pressure is supported by the outer mold having a different split surface, that is, the mold itself, and the outer mold is supported by the internal pressure of the material tube. The force acting in the direction in which the molds are separated is small, and the alignment state of the molds during molding can be maintained only by applying a slight supporting force to the outer mold.
[0017]
Further, the mold is a two-part mold having a single split surface passing through an axis, and the rotation angle between the alignment position and the molding position is approximately 90 °.
[0018]
That is, the mold is divided into two molds, and the rotation angle of the inner mold after combining the molds is set to 90 °. It becomes a direction along the surface, and the combined state can be maintained without applying a special force to the outer mold.
[0019]
Further, the inner mold rotating means applies a rotational force to one or both of a pair of rotating plates disposed opposite to both sides of the mold in parallel with each other, and rotates on the same axis as the mold. And a drive rod that is installed between the two rotating plates and that is inserted into a holding hole that passes through a corresponding position of the inner mold of each mold.
[0020]
That is, a pair of rotating plates are arranged opposite to each other on both sides of the molds arranged on the same axis, and the operating rods laid between them are collectively inserted into the holding holes penetrating the inner molds of the respective molds. The rotation of the rotating plate caused by the transmission of the mold is transmitted to the inner mold of each mold through the operating rod, and the inner mold is rotated in a lump so that the transition from the combined mold state to the molded state is complicated. Realized without any operation.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is a plan view showing a configuration of a main part of a flexible tube manufacturing apparatus according to the present invention (hereinafter referred to as the present invention apparatus).
[0022]
The apparatus according to the present invention includes a flexible tube 1 in which a plurality of annular projections 10, 10,... Having a corrugated cross section are juxtaposed in the axial length direction by bending a circumferential wall of a material tube having a circular tube shape, as shown in FIG. A plurality of molds 3, 3,... Arranged in parallel with each other at a predetermined pitch in the longitudinal direction on a substantially horizontal floor surface inside the rectangular support frame 2, and configured in parallel. It comprises a pair of press heads 4, 4 arranged opposite to each other in the installation direction.
[0023]
The press heads 4 and 4 are provided with holding projections 40 and 40 that are coaxially projected on the surface facing the other, and a material tube S (see FIGS. 7 and 8) that is a material of the flexible tube 1 is disposed at both ends thereof. Is held in the holding projections 40, 40 and supported, and a compression force in the axial length direction is applied to the material tube S.
[0024]
A pair of opening / closing tables 50 and 50 are installed on the inner side of the support frame 2 along the longitudinal direction thereof, and a predetermined stroke including the outer side of the support frame 2 is advanced and retracted in these longitudinal directions. The forming cylinders 41 and 41 are fixed. One of the press heads 4, 4 is attached to a movable table 42 connected to the output rod of the molding cylinders 41, 41, and the other press machine is moved by the movement of the movable table 42 as the molding cylinders 41, 41 move back and forth. The movable head is configured to move in a direction in which the head 4 is in contact with or separated from the head.
[0025]
The other press head 4 is attached to a fixed base 44 facing the movable base 42 and is configured as a fixed head. The fixed base 44 is fixed to the outer wall of the support frame 2 and is connected to the output ends of the fixed cylinders 43 and 43 on the inner side of the support frame 2, and comes into contact with the movable base 42 as the fixed cylinders 43 and 43 advance and retract. An appropriate stroke can be moved in the direction of separation, but this movement is performed when the material tube S before molding is attached and when the flexible tube 1 is removed after molding. The fixed base 44 is kept in a fixed state, and the compression of the material tube S is performed by moving the movable base 42 by the operation of the molding cylinders 41 and 41 and bringing it closer to the fixed base 44.
[0026]
A plurality of molds 3, 3... Are prepared according to the required number of annular projections 10, 10... Of the flexible tube 1 to be obtained, and are arranged in parallel so as to be coaxial with the press heads 4, 4. .
[0027]
FIG. 2 is a perspective view of the mold 3 used in the apparatus of the present invention. The illustrated mold 3 is a rectangular flat plate having a circular hole 30 penetrating the shaft center as a whole, like the conventional mold 7 shown in FIG. It is configured as a split mold that can be divided into two by a split surface 31 along one side.
[0028]
As in FIG. 6, FIG. 2 (a) shows the separated state of the mold 3, and FIG. 2 (b) shows the assembled state of the mold 3. As shown in FIG. On the inner peripheral surface of the circular hole 30 forming a circular shape, a convex strip 32 having a corrugated axial cross section is formed by cutting both sides in the thickness direction into a large diameter and projecting the central portion inward. The ridges 32 are continuous over the entire circumference of the inner surface of the circular hole 30 in the aligned state shown in FIG.
[0029]
The feature of the mold 3 of the present invention is that each of the half portions of the divided mold 3 is composed of an inner mold 3a and an outer mold 3b which are detachably combined. As shown in the figure, the inner mold 3a is a semicircular plate material centering on a half portion of the circular hole 30, and a protrusion 33 having a predetermined width is provided around the outer periphery thereof. On the other hand, the outer mold 3b has an inner diameter equal to the outer diameter of the inner mold 3a, and has a semicircular fitting hole provided with a concave groove 34 that engages with the protrusion 33 on the inner circumference on the split surface side with the other. The inner mold 3a and the outer mold 3b are integrated as shown in (a) by engaging the former ridge 33 with the latter groove 34.
[0030]
The mold 3 used in the apparatus of the present invention is configured as shown in (b) by aligning and abutting the half split surfaces 31, 31 configured as described above in the width and length directions. . In this state, the fitting portion between the inner mold 3a and the outer mold 3b is continuous in the circumferential direction, and the inner mold 3a can be rotated around its axis by sliding of the ridge 33 along the groove 34. In the apparatus of the present invention, after obtaining the aligned state as shown in FIG. 2 (b), the inner mold 3a is rotated, and the split position 31 of the inner mold 3a does not align with the split face 31 of the outer mold 3b. Then, molding is performed in this state. FIG. 3 is a perspective view showing a state of the mold 3 at the time of molding. At the time of molding, the inner mold 3a is rotated by approximately 90 ° from the alignment position shown in FIG. 2 (b) and rotated as shown in FIG. It is assumed to be a position.
[0031]
On the floor surface inside the support frame 2, as shown in FIG. 1, a pair of guide rails 20 and 20 are laid in parallel to each other in a manner that crosses a position at a predetermined distance in the longitudinal direction in the width direction. The opening / closing tables 50, 50 are attached to be movable along the guide rails 20, 20. A pair of support bases 5, 5 are erected on the upper ends of the open / close tables 50, 50 at both ends in the longitudinal direction, and the molds 3, 3. A pair of upper and lower support rods 51, 51 are installed.
[0032]
As shown in FIGS. 2 and 3, the molds 3, 3... Are provided with support holes 35, 35... That pass through the four corners of each outer mold 3b in the thickness direction. Each of the support rods 51, 51... Is inserted into the support heads 51, 51.
[0033]
The open / close tables 50, 50 are connected to the output ends of the separate open / close cylinders 52, 52 fixed on the floor surface inside the support frame 2 in the middle in the longitudinal direction. In accordance with the operation, the guide rails 20 and 20 are guided and moved together with the halves of the molds 3, 3. When the molds 3, 3,... Are approached as the opening / closing cylinders 52, 52 are advanced, the respective halves of the molds 3 are abutted about the axial centers of the press heads 4, 4, and are brought into the aligned state shown in FIG. On the other hand, when the opening / closing cylinders 52 and 52 are separated from each other, the respective halves are separated by a predetermined length on both sides of the press heads 4 and 4 to be in a separated state shown in FIG. FIG. 1 shows a state where the molds 3, 3... Are aligned in the upper half, and a state where the molds 3, 3 are separated in the lower half.
[0034]
Each of the molds 3, 3... Opened and closed as described above has outer molds 3 b, 3 b, which are supported at the four corners by the support rods 51, 51, so that the inner molds 3 a, 3 a. The apparatus of the present invention is provided with an inner mold rotating means for collectively rotating these inner molds 3a, 3a... In the above-mentioned combined state. Can be rotated between a rotation position (alignment position) shown in FIG. 3 and a rotation position (molding position) shown in FIG.
[0035]
The inner mold rotating means is attached to each of the support bases 5 and 5 and is arranged between a pair of rotating plates 6 and 6 disposed on both sides of the molds 3, 3. And a pair of actuating rods 60, 60.
[0036]
FIG. 4 is a perspective view showing how the rotating plate 6 is attached to one support base 5 (a half thereof). As shown in the figure, the rotating plate 6 is a semi-circular external gear having teeth formed on the outer periphery thereof. The rotating plate 6 is provided between the supporting base 5 indicated by a two-dot chain line in the figure and the other supporting base 5 (not shown). The outer teeth are meshed with the output gear 61 of the geared motor M fixedly supported on the support base 5, and are pivotally supported around an axis coinciding with the center of the molds 3, 3. By transmission from the geared motor M, it rotates in a plane parallel to the molds 3 and 3.
[0037]
One end of a pair of actuating rods 60, 60 is provided on a surface of the rotating plate 6 facing the other rotating plate 6 on a predetermined circumference centered on the axis thereof, for example, as a screwing means. These other ends are similarly connected to the other rotating plate 6 facing the illustrated rotating plate 6. As a result of this connection, the operating rods 60, 60 are installed between the rotating plates 6, 6 along the direction in which the dies 3, 3. When the rotating plate 6 rotates, the operating rods 60, 60 rotate along their circumferences.
[0038]
In the above description, transmission from the geared motor M is performed only on one rotary plate 6 of the pair of opposed rotary plates 6 and 6 as if the other rotary plate 6 rotates following. As described above, in this case, there is a possibility that the following rotation of the other rotating plate 6 may not be smoothly generated due to the elasticity of the operating rods 60, 60. It is preferable that a geared motor M is attached to the two, and these are rotated synchronously to apply a rotational force to both rotary plates 6 and 6.
[0039]
As shown in FIGS. 2 and 3, the inner die 3b of the die 3 has a predetermined circumference centered on the axis thereof, specifically, an arrangement circle of the operating rods 60, 60 on the rotating plate 6. A pair of holding holes 36 and 36 penetrating in the thickness direction are formed at positions equidistant on both sides of the split surface 31 on the circumference of the same diameter as shown in FIG. As described above, the operating rods 60 and 60 are inserted into the holding holes 36 and 36 formed in the half on the same side. The operation rods 60, 60 are inserted in the same manner for each of the plurality of dies 3, 3,. Thereby, the rotation of the rotating plate 6 due to the transmission from the geared motor M is transmitted to the inner molds 3a, 3a,... Of the molds 3, 3,. .., 3b, 3b,... Are rotated together around the axis, and thus the inner mold rotating means is configured.
[0040]
The rotary plate 6 is formed with a guide groove 62 having a central angle of about 90 ° along an appropriate circumference coaxial with the outer periphery thereof. The guide groove 62 is placed in the support base 5 in the guide groove 62. The guide pin 63 is engaged. Thus, the rotation of the rotating plate 6 is caused by the restriction of the guide groove 62 by the guide pin 63 between the rotation position indicated by the solid line in FIG. 4 and the rotation position indicated by the broken line, that is, a rotation angle of approximately 90 °. The inner shape 3a, 3a,... Is realized at the one rotational position, the alignment position shown in FIG. 2 (b), and at the other rotational position, the molding position shown in FIG. Is done.
[0041]
In the above description, the rotating plate 6 is attached only to one half of the support base 5 that is separated as the molds 3, 3... Open and close, and the rotation of the rotating plate 6 is controlled by the inner molds 3b, 3b. It is configured to transmit to one half and the other half to follow and rotate. However, a similar mechanism may be provided in both halves of the support base 5 to apply a rotational force to the entire inner shape 3b. . However, this configuration is accompanied by an increase in the required number of geared motors M and a complicated control system for synchronously rotating them. Further, the configuration of the inner mold rotating means is not limited to the configuration shown in the figure, and any other configuration is possible as long as the inner molds 3b, 3b,. It is also possible to adopt.
[0042]
The flexible tube 1 manufactured by the apparatus of the present invention configured as described above is manufactured in the same manner as the conventional procedure shown in FIGS. 7 to 9. First, the material tube S, which is a thin metal tube, is used as the press head 4. , 4 between. In this attachment, as shown in the lower half of FIG. 1 and FIG. 2A, the molds 3 and 3 are kept in a separated state, and the material tube S inserted between them is positioned between the press heads 4 and 4. Then, the movable table 42 and the fixed table 44 are brought close to each other by the operation of the molding cylinder 41 and the fixed cylinder 43, and the holding projections 40, 40 projecting from the axial centers of the press heads 4, 4 are attached to both ends of the material tube S. It is done by fitting it into
[0043]
After this attachment, the open / close cylinders 52, 52 are advanced to bring the plurality of molds 3, 3,... Into a combined state as shown in FIG. As a result, the material tube S attached between the press heads 4 and 4 is collectively inserted into the circular holes 30 formed in the centers of the molds 3 and 3. The inner surface of 30, 30 ..., more specifically, grips multiple points in the axial length direction from the outside by the edges of the ridges 32, 32 ... provided around the inner surface of each circular hole 30, 30 ... It will be in the state.
[0044]
In the apparatus of the present invention, after that, a specific operation for driving the geared motor M and rotating the rotating plate 6 by 90 ° is performed, whereby the inner dies 3a, 3a of the dies 3, 3,. The molding position shown in FIG. Thereafter, the material tube S supported between the press heads 4 and 4 is molded cylinder 41 while the hydraulic pressure is introduced into the inside thereof from a hydraulic pressure inlet (not shown) formed in the fixed-side press head 4. Are compressed in the axial length direction, deformed as shown in FIGS. 8 and 9, and have a corrugated axial cross section between the ridges 32, 32,. A flexible tube 1 in which a plurality of annular protrusions 10, 10,.
[0045]
In this molding process, the material tube S tries to swell by the action of the hydraulic pressure introduced inside, so that the molds 3, 3. Force acts. In the apparatus of the present invention, prior to the introduction of the hydraulic pressure, a molding position is realized in which the inner mold 3a is rotated by 90 ° with respect to the outer mold 3b in each of the plurality of molds 3, 3,. As shown in FIG. 3, the split surface 31 of the inner mold 3a and the split surface 31 of the outer mold 3b are in a state of being orthogonal to each other. Therefore, the acting direction of the resultant force applied to separate the inner mold 3a at the split surface 31 by the internal pressure of the material tube S is the direction along the split surface 31 of the outer mold 3b, as indicated by white arrows in FIG. Thus, separation of the inner mold 3a can be prevented with a margin due to the rigidity of the outer mold 3b, and a member for preventing separation of the molds 3, 3,... Is not required like the pressure receiving blocks 9, 9 in the conventional apparatus. .
[0046]
The supporting rods 51, 51,... That support the four corners of the outer molds 3b, 3b,... Maintain the concentricity of the molds 3, 3,. As the material tube S is compressed between the molds 3, the molds 3, 3... Are moved by using the support rods 51, 51. The annular projections 10, 10... Molded between the molds 3, 3... Are good with little tilt with respect to the axis, and the high-quality flexible tube 1 can be manufactured stably.
[0047]
The flexible tube 1 obtained as described above is separated from the molds 3, 3... And the press heads 4 and 4 are extracted from both ends thereof, and then taken out upward, for example. In the apparatus of the present invention, prior to this removal, the geared motor M is driven in reverse to return the inner dies 3a, 3a of the dies 3, 3,... To the alignment position shown in FIG. The separation of 3, 3... Is performed in a lump by moving the open / close cylinders 52, 52 in this state. Further, the extraction of the press heads 4 and 4 is realized by separating the press heads 4 and 4 by the operations of the molding cylinder 41 and the fixed cylinder 43.
[0048]
【The invention's effect】
As described above in detail, in the apparatus of the present invention, a split mold including a disk-shaped inner mold having a molding circular hole at its axial center and an outer mold for rotatably holding it around the axis. And further comprising an inner mold rotating means for rotating the inner mold in a lump, so that prior to molding performed with the mold and the material tube inserted through the circular hole. The inner mold is rotated so that the split surfaces of the inner mold and the outer mold do not match each other, and in this state, the inner mold is separated from the split face by the action of the hydraulic pressure introduced inside the material tube. The applied force is supported by an outer mold with different split surfaces, the force acting in the direction of separating the outer mold by the internal pressure of the material tube is small, and the mold can be aligned during molding by applying a slight support force to the outer mold It becomes possible to maintain the state A bulky pressure receiving block constructed separately to prevent mold separation is not required, miniaturization of the apparatus is achieved, and mold collapse during molding is prevented, resulting in a high-quality flexible tube. It becomes like this.
[0049]
In addition, since the mold composed of the inner mold and the outer mold is divided into two, and the inner mold is rotated 90 ° from the alignment state at the time of molding, the inner mold is separated by the action of the hydraulic pressure introduced inside the material tube. The acting direction becomes a direction along the split surface of the outer mold, and the combined state can be maintained without applying a special force to the outer mold, and separation of the mold during molding can be more effectively prevented.
[0050]
Further, the inner rod rotating means is inserted into a holding hole penetrating the inner mold of each mold, with an operating rod installed between a pair of rotating plates opposed to both sides of the mold in the parallel arrangement direction. Since the rotation is transmitted to the inner mold of each mold via the operating rod and the inner mold is rotated at once, the transition from the mating state to the molding state can be reliably realized with a simple configuration, etc. The invention has an excellent effect.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a main part of an apparatus according to the present invention.
FIG. 2 is a perspective view of a mold used in the apparatus of the present invention.
FIG. 3 is a perspective view showing a state of a mold during molding.
FIG. 4 is a perspective view showing an attachment mode of a rotating plate as inner mold rotating means.
FIG. 5 is an axial sectional view of a flexible tube manufactured in the apparatus of the present invention.
FIG. 6 is a perspective view of a conventional mold used for manufacturing a flexible tube.
FIG. 7 is an explanatory diagram of a conventional procedure for manufacturing a flexible tube.
FIG. 8 is an explanatory diagram of a conventional procedure for manufacturing a flexible tube.
FIG. 9 is an explanatory diagram of a conventional procedure for manufacturing a flexible tube.
[Explanation of symbols]
1 Flexible tube
2 Support frame
3 Mold
3a Inner type
3b outer mold
4 Press head
5 Support stand
6 Rotating plate
20 Guide rail
31 Split face
35 Support hole
36 Holding hole
41 Molding cylinder
51 Support rod
52 Opening and closing cylinder
60 Actuating rod
M geared motor
S material tube

Claims (3)

A plurality of molds configured as split molds are provided around the inner surface of a circular hole that penetrates the shaft center part and has a corrugated axial section, and are arranged side by side at predetermined intervals on the same axis. Applying a compressive force in the axial length direction while introducing hydraulic pressure inside the material tube inserted in a lump, and corrugated annularly in the part sandwiched between the ridges of each mold on the outer periphery of the material tube In the flexible tube manufacturing apparatus that molds the protrusion, the mold includes a disk-shaped inner mold having the circular hole at the center thereof, and an outer mold that holds the inner mold so as to be rotatable around an axis. And apply rotational force to the inner mold of each mold at once, and rotate between the alignment position where these split faces and each outer mold split face are aligned and the molding position where they are not aligned as well. An apparatus for producing a flexible tube, comprising an inner mold rotating means. 2. The flexible tube manufacturing apparatus according to claim 1, wherein the mold is a split mold having a single split surface passing through an axis, and a rotation angle between the alignment position and the molding position is approximately 90 °. . The inner mold rotating means is a drive that applies a rotational force to one or both of a pair of rotating plates disposed opposite to both sides of the mold in parallel with each other and rotates coaxially with the mold. The flexible tube manufacturing method according to claim 1 or 2, further comprising: a source and an operating rod that is installed between the two rotating plates and is collectively inserted into a holding hole that passes through a corresponding position of the inner mold of each mold. apparatus.

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