JP2020025976A - Tube expansion metal mold and tube contraction metal mold, and each metal mold equipment - Google Patents

Abstract

To provide a tube expansion metal mold and a tube contraction metal mold which enables tube expansion and tube contraction easily and at an inexpensive price even when a diameter and a length of a steel tube are large, and each metal mold equipment.SOLUTION: A tube expansion metal mold for processing a tube (13) so as to expand a tube diameter, comprises: a metal mold base (31); a core metal mold (32) which is fixed to the metal mold base (31) and extends in an axial direction; a tip metal mold (33) anchored to a tip of the core metal mold (32); and outer peripheral ring metal molds (34, 51, 53) which are fitted to an outer periphery of the core metal mold between the metal mold base (31) and the tip metal mold (33), and have outer peripheral taper parts (34a, 51a, 53a) of prescribed external dimensions (D1 to D3) which gradually increase from the tip metal mold (33) side to the metal mold base side. When an inner diameter part of the tube (13) pressed against at least the outer peripheral taper part (34a, 51a, 53a) of the outer peripheral ring metal molds (34, 51, 53) in a pushing direction, a tube diameter of the tube (13) is expanded.SELECTED DRAWING: Figure 8

Description

    The present invention relates to a mold for processing a pipe, particularly a steel pipe, so as to increase (expand) or decrease (decrease) the diameter of the steel pipe, and an apparatus therefor.

  Conventionally, in order to expand the end of a relatively small diameter steel pipe such as an automobile oil supply pipe, for example, as shown in Japanese Patent Application Laid-Open No. 2001-179368, a punch 2 as a mold is provided on the opening side of the steel pipe 1. The diameter of the opening side end portion of the steel pipe 1 was enlarged (expanded) by pushing in the tapered end portion (in other words, fitting the opening of the steel pipe 1 into the tapered end of the punch 2 and pushing it in). .

JP 2001-179368 A

  However, in the conventional steel pipe expanding device described in Patent Document 1 described above, since the punch 2 as a mold is an integral member, for example, as in a steel pipe used for a steel pipe electric pole, the diameter and the diameter of the expanded portion of the steel pipe are changed. When the length is large, the shape and weight of the punch 2 are large, and the material cost is high. When it is desired to expand the steel pipe 1 into a plurality of stages and sequentially expand the steel pipe 1 to have a large diameter, a plurality of types are required. There is a problem that the punch 2 needs to be prepared and the cost is further increased.

Further, there is a similar problem when the steel pipe is contracted.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is an expanding pipe metal that can be easily and inexpensively expanded or reduced in diameter even when a portion of the steel pipe to be expanded or reduced in diameter and length is large. It is an object of the present invention to provide a mold and a contraction mold, and each mold apparatus.

In order to achieve the above object, an expansion mold according to the present invention includes:
In an expansion die for processing to expand the pipe diameter of the pipe (13),
Mold base (31),
A core mold (32) fixed to the mold base (31) and extending in the axial direction;
A tip mold (33) fixed to the tip of the core mold (32) and having an outer peripheral tapered portion (33a) whose outer diameter gradually increases from the tip side to the mold base side;
Between the mold base (31) and the tip mold (33), the outer diameter of the core mold is fitted from the tip mold (33) side to the mold base side. Outer peripheral ring molds (34, 51, 53) having outer peripheral tapered portions (34a, 51a, 53a) having predetermined outer dimensions (D1 to D3) gradually increasing toward
When the inner diameter portion of the tube (13) is pressed against at least the outer peripheral taper portion (34a, 51a, 53a) of the outer peripheral ring mold (34, 51, 53) in the pushing direction, the tube (13). This is a tube expansion die in which the diameter of the tube is enlarged.

Preferably, the mold base (31), the core mold (32) and the tip mold (33) are integrally fixed to each other by bolts (36 to 38).
Also preferably, the outer peripheral ring molds (34, 51, 53) are composed of two or more partial outer peripheral ring molds (34A to 34E, 51A to 51E, 53A to 53E) stacked in the axial direction. .

  More preferably, the tip mold (33) has an outer peripheral taper portion (33a2, 33b2, 33c) having an outer diameter gradually increasing from the tip side to the mold base side on the outer periphery thereof. The inner diameter portion of the pipe (13) is first expanded by the outer peripheral tapered portions (33a2, 33b2, 33c).

  More preferably, the outer peripheral taper portions (33a2, 33b2, 33c) of the tip dies (33A to 33C) and the outer peripheral taper portions (34a, 51a, 53a) of the outer peripheral ring dies (34, 51, 53). Are different from each other in the taper angle value.

More preferably, the tip dies (33A, 33B) have guide portions (33a1, 33b1) for guiding the pipe (13) at the tip side.
More preferably, at least the tip mold (33) and the outer ring mold (34, 51, 53) are formed by subjecting the SKD11 material to a high-temperature tempering treatment and a low-temperature TIC coating treatment and then mirror-finishing the outer peripheral surface.

  In addition, the present invention provides the above-described tube expanding mold in which a plurality of sets (15A to 15C) are provided for expanding the pipe in a plurality of stages, and the outer ring molds (34, 51, The outer diameters (D1 to D3) of 53) are different so as to satisfy a predetermined dimensional relationship (D1 <D2 <D3), and the pipe (13) is sequentially expanded by a plurality of expansion molds (15A to 15C). This is a tube expansion mold set that is processed and its inner diameter is sequentially enlarged.

  Further, the present invention is provided near the outer periphery of the outer peripheral ring mold (34, 51, 53) adjacent to at least one of the tube expansion molds (15A to 15C) and the mold base (31). A mold release member (16), which pushes back the pipe (13) that has been expanded by the release member (16) in a direction opposite to the pushing direction, thereby forming the outer peripheral ring. This is a tube expanding die apparatus separated from the die (34, 51, 53) and the tip die (33).

  Preferably, it comprises a first detection member (44) attached to the mold base (31) or a member integral therewith, and a second detection member (45) attached to the release member (16). A detection device (43) is provided, and when the release member (16) is pressed and moved by the tube (13) to be expanded, the expansion of the tube (13) is completed by the detection device (43). Is detected.

Another aspect of the present invention is a contraction mold for processing to reduce the diameter of the tube (13),
Mold base (31A),
An outer peripheral cylindrical mold (61) fixed to the mold base (31A) and extending in the axial direction;
Tip cylindrical mold (62) fixed to the tip of the outer cylindrical mold (61) and having an inner peripheral tapered portion (62a) whose inner diameter gradually decreases from the tip side to the mold base side. When,
Between the mold base (31A) and the distal end cylindrical mold (62), the inner peripheral dimension of the outer peripheral cylindrical mold (61) is fitted and the inner diameter dimension of the distal end cylindrical mold (61) is set. 62) An inner peripheral ring mold (63, 78, 79) having an inner peripheral taper portion (63a, 78a, 79a) having a predetermined inner diameter (d1 to d3) gradually decreasing from the mold base side. And
When the outer diameter portion of the tube (13) is pressed at least against the inner peripheral taper portion (63a, 78a, 79a) of the inner peripheral ring mold (63, 78, 79), The pipe diameter of the pipe (13) is reduced.

Preferably, the mold base (31A), the outer cylindrical mold (61) and the tip cylindrical mold (62) are integrally fixed to each other by bolts (65 to 67).
Preferably, the inner peripheral ring mold (63) is composed of two or more partial inner peripheral ring molds (63A to 63D, 78A to 78D, 79A to 79D) stacked in the axial direction.

  More preferably, the distal end cylindrical mold (62) has an inner peripheral taper portion (62a2, 62b2, 62c) on the inner periphery in which the inner diameter gradually decreases from the distal end side toward the mold base side. Then, the outer diameter portion of the pipe (13) is first contracted by the inner peripheral taper portions (62a2, 62b2, 62c).

  More preferably, the inner peripheral taper portions (62a2, 62b2, 62c) of the tip cylindrical mold (62) and the inner peripheral taper portions (63a, 78a, 79a) are different from each other in the taper angle value.

More preferably, the tip mold (62) has a guide part (62a1, 62b1) for guiding the pipe (13) on the tip side.
More preferably, at least the tip mold (62) and the inner ring mold (63, 78, 79) are formed by subjecting the SKD11 material to high-temperature tempering and low-temperature TIC coating, and then mirror-finishing the inner surface. I have.

Further, in the present invention, a plurality of sets (21A to 21C) of the contraction mold are provided for contracting a tube in a plurality of stages,
The inner diameters (d1 to d3) of the inner ring molds (63, 78, 79) of each set (21A to 21C) are different so as to satisfy a predetermined dimensional relationship (d1>d2> d3).
The tube (13) is a contraction mold set in which a plurality of sets of contraction molds (21A to 21C) are sequentially contracted to reduce the outer diameter of the tube (13).

Further, the present invention provides the constriction mold,
A mold pressing device (73) provided adjacent to the mold base (31A) near the inner periphery of the inner ring mold (63, 78, 79); By the release pressing member (73), the pipe (13) having completed the contraction processing is pushed back in a direction opposite to the pushing direction, and the inner peripheral ring molds (63, 78, 79) and the tip mold (62). ) Is a contraction mold apparatus.

  Preferably, a first detection member (44) attached to the mold base (31A) or a member (71) integral therewith, and a second detection member (45) attached to the release member (16). When the release pressing member (73) is pressed and moved by the tube (13) to be subjected to the contraction processing, the detection device (43) is used to detect the tube (13). ) Is a contraction die apparatus for detecting the end of the contraction processing.

The following are the effects obtained from the present invention.
(1) An expansion die for expanding the pipe (13) is generally composed of a core die (32), a tip die (33), and an outer peripheral ring die (34, 51) with an outer tapered portion (34a, 51a, 53a). , 53) are assembled by assembling, so that the tip mold (33) and the outer ring mold (34, 51, 53) are exchanged while the core mold (32) is used in common. Thus, it is possible to cope with a change in the expanded diameter of the pipe (13), so that it is possible to cope with various expanding processes, and it is possible to reduce the cost by commonly using the core mold (32).

(2) Since the mold base (31), the core mold (32) and the tip mold (33) are integrally fixed to each other by bolts, the assembling work is simple and the structure is solid.
(3) Since the outer peripheral ring mold (34) is composed of two or more partial outer peripheral ring molds (34A to 34E) stacked in the axial direction, the total length of the outer peripheral ring mold (34) in the axial direction is reduced. When it is large, the production becomes easier as compared with the production from one member. In addition, since the individual partial outer peripheral ring dies (34A to 34E) can be miniaturized, the cost of the TiC coating process is reduced. Further, when any of the partial outer peripheral ring dies (34A to 34E) is worn, the cost can be reduced simply by replacing the worn partial dies. In addition, the length of each of the partial outer peripheral ring dies (34A to 34E) can be changed within a certain length of the outer peripheral ring mold (34), and a plurality of partial outer peripheral ring dies can be integrated to form a module. There is also versatility.

  (4) Since the outer peripheral taper portion (33a2, 33b2, 33c) is provided in the tip mold (33), the inner diameter portion of the pipe (13) is first expanded to some extent, so that the outer peripheral ring mold (34) in a later process is formed. , 51, 53) becomes easier.

  (5) The outer peripheral tapered portions (33a2, 33b2, 33c) of the tip dies (33A to 33C) and the outer peripheral tapered portions (34a, 51a, 53a) of the outer ring dies (34, 51, 53) are: Since the taper angle values are different from each other (for example, the former taper angle is larger than the latter taper angle), the pipe (13) is made to have a fitting portion diameter of a predetermined diameter by, for example, the outer peripheral taper portion (33a2, 33b2, 33c). The outer peripheral taper portion (34a, 51a, 53a) can impart a predetermined taper angle to the fitting portion.

  It is also possible to process an expanded portion having a different taper angle value in one pipe (13) based on different taper angle values of the outer peripheral taper portion of the tip mold (33) and the outer ring mold (34, 51, 53). It is.

  (6) Since the tip dies (33A, 33B) have guide portions (33a1, 33b1) for guiding the pipe (13) on the tip side thereof, the pipe (13) can smoothly and easily have the outer peripheral ring dies (34, 33). Guided to 51).

  (7) Since at least the tip mold (33) and the outer ring mold (34, 51, 53) are formed by subjecting the SKD11 material to high-temperature tempering treatment and low-temperature TIC coating treatment and then mirror-finishing the outer peripheral surface, The outer peripheral surfaces of the mold (33) and the outer peripheral ring molds (34, 51, 53) are hard, have good slippage, and have high abrasion resistance, so that the pipe (13) can be smoothly pushed in at the time of processing. The mold itself has no damage and the durability is improved, so that the pipe expanding process can be performed smoothly.

  (8) Plural sets of expansion dies are provided in which at least the shape of the outer peripheral taper portion (33a) of the tip die (33) and the outer diameter of the outer peripheral ring dies (34, 51, 53) are different. Therefore, the pipe (13) can be expanded stepwise, so that a good and wide expansion process can be performed.

  (9) Since the mold apparatus provided with the mold release member (16) adjacent to the expansion mold is configured, the expanded pipe (13) is pushed back in the direction opposite to the original pushing direction. The tube (13) can be easily separated from the mold.

(10) Since the completion of the expanding process of the pipe (13) can be detected by the detecting device (43) attached to the release member (16), the accurate expanding process can be performed.
(11) The contraction mold for contracting the pipe (13) is generally provided with an outer cylindrical mold (61), a distal cylindrical mold (62) and an inner peripheral taper (63a, 78a, 79a). Since the three components of the peripheral ring molds (63, 78, 79) are assembled, the outer cylindrical mold (61) is used in common and the tip cylindrical mold (62) and the inner periphery are used. By exchanging the ring molds (63, 78, 79), it is possible to cope with a change in the expanded diameter of the pipe (13). Cost can be reduced by use.

(12) Since the mold base (31A), the outer cylindrical mold (61), and the tip cylindrical mold (62) are integrally fixed to each other by bolts, the assembling work is simple and the configuration is solid.
(13) Since the inner peripheral ring mold (63) is composed of two or more partial inner peripheral ring molds (63A to 63D) stacked in the axial direction, the shaft of the inner peripheral ring mold (63) is formed. When the overall length in the direction is large, the production becomes easier as compared with the production from one member. Further, since the individual partial inner peripheral ring dies (63A to 63D) can be miniaturized, the cost of the TiC coating process is reduced. Further, when any of the partial inner peripheral ring dies (63A to 63D) is worn, the cost can be reduced only by replacing the worn partial dies. Further, the length of each of the partial inner peripheral ring dies (63A to 63D) can be changed within a certain length of the inner peripheral ring die (63), and a plurality of partial inner peripheral ring dies can be integrated into a module. There is also versatility such as being able to be converted.

  (14) By providing the inner peripheral taper portion (62a2, 62b2, 62c) in the tip cylindrical mold (62), the outer diameter portion of the pipe (13) is firstly contracted to some extent, so that in the later steps, The tube reduction by the peripheral ring molds (63, 78, 79) is facilitated, and the inner peripheral taper portions of the tip cylindrical mold (62) and the inner peripheral ring molds (63, 78, 79) have different tapers. It is also possible to machine different tube portions with different taper angle values in one tube (13) based on the angle values.

  (15) The inner peripheral taper (62a2, 62b2, 62c) of the tip cylindrical mold (62) and the inner peripheral taper (63a, 78a, 79a) of the inner ring mold (63, 78, 79). Since the taper angle values are different from each other (for example, the former taper angle is larger than the latter taper angle), the pipe (13) is fitted with a predetermined diameter by, for example, the inner peripheral taper portion (62a2, 62b2, 62c). The diameter can be reduced to the joint diameter, and then a predetermined taper angle can be given to the fitting part by the latter inner peripheral taper part (63a, 78a, 79a).

  (16) Since the distal end cylindrical mold (62) has the guide portions (62a1, 62b1) for guiding the pipe (13) on the distal end side, the pipe (13) can smoothly and easily have the inner peripheral ring mold (63). , 78).

  (17) Since at least the end cylindrical mold (62) and the inner ring mold (63) are formed by subjecting the SKD11 material to high-temperature tempering treatment and low-temperature TIC coating treatment, the outer peripheral surface is mirror-finished. Since the inner peripheral surfaces of the cylindrical mold (62) and the inner peripheral ring mold (63) are hard and have good slippage and abrasion resistance, the pushing movement at the time of processing the pipe (13) becomes smooth. The mold itself has no damage and the durability is improved, and the tube can be smoothly processed.

  (18) A plurality of sets of reduced tube dies in which at least the shape of the inner peripheral taper portion (62a) of the tip cylindrical mold (62) is different from the outer diameter of the inner peripheral ring mold (63). Since it is provided, the tube (13) can be contracted stepwise, so that a good and wide contraction process can be performed.

  (19) Since the mold device is provided with the release member (73) adjacent to the contraction die, the tube (13) that has been subjected to the contraction processing is pushed back in the direction opposite to the original pushing direction to return the tube. (13) can be easily separated from the mold.

  (20) Since the end of the tube reduction of the pipe (13) can be detected by the detection device (43) attached to the release pressing member (73), accurate tube reduction can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the whole pipe expansion or contraction pipe processing apparatus which applied the pipe expansion die and contraction die which concern on this invention. It is a side view of the pipe expansion or contraction processing apparatus shown in FIG. It is a front view of the pipe expansion or contraction processing apparatus shown in FIG. FIGS. 4A and 4B are a partial plan view showing a tube expanding die portion of the processing apparatus of FIG. 1 and an enlarged sectional view taken along line 4B-4B in FIG. 4A. FIGS. 4A and 4B are a partial plan view showing a tube expanding die portion of the processing apparatus of FIG. 1 and an enlarged sectional view taken along line 4B-4B in FIG. 4A. 5A and 5B are a front view and a side view of a tube clamp of the processing apparatus of FIG. 1, respectively. 6A and 6B are a front view and a side view showing a state where the clamp of FIG. 5 clamps a tube, respectively. BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view of 1st Embodiment of the tube expansion die which concerns on this invention. It is sectional drawing of 1st Embodiment of the said expansion mold. It is sectional drawing of the 2nd Embodiment of the said tube expansion die. It is sectional drawing of 3rd Embodiment of the said tube expansion die. 11A and 11B are a longitudinal sectional side view and a front view, respectively, of the outer peripheral ring mold of the above-described tube expanding mold. BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view which cuts and shows 1st Embodiment of the constriction mold which concerns on this invention. It is sectional drawing of 1st Embodiment of the said contraction die. It is sectional drawing of 2nd Embodiment of the said contraction die. It is sectional drawing of 3rd Embodiment of the said contraction die. 16A and 16B are a longitudinal sectional side view and a front view, respectively, of the inner peripheral ring mold of the above-described contracted tube mold. FIGS. 17A to 17G are diagrams showing steps of expanding a pipe using an expansion mold. FIGS. 17A to 17G are diagrams showing steps of expanding a pipe using an expansion mold. FIG. 18A and FIG. 18B are views showing a state in which the pipe is stepwise expanded in a stepwise manner before the first stage process and a state in which the pipe is pushed into the first expansion mold and the processing is completed. . FIG. 19A and FIG. 19B are views showing the same state as before, the state of the pipe alone before the second stage process, and the state where the pipe has been pushed into the second expanding die and finished. FIG. 20A and FIG. 20B are views showing the same state as before, the state of the pipe alone before the third step process, and the state where the pipe has been pushed into the third expansion mold and finished. It is a figure which shows the pipe which completed the pipe expansion process. FIG. 22A to FIG. 22G are diagrams showing steps of contracting a pipe using a contraction die. FIG. 22A to FIG. 22G are diagrams showing steps of contracting a pipe using a contraction die. FIGS. 23A and 23B are diagrams respectively showing a state in which the pipe is stepped down in a stepwise manner before the first step, and a state in which the pipe is pushed into the first reduced-pipe die and the processing is completed. It is. FIG. 24A and FIG. 24B are views showing the same state as before, the state of the pipe alone before the second stage process, and the state where the pipe has been pushed into the second contraction die and finished. FIGS. 25A and 25B are views showing the same state as before, the state of the pipe alone before the third step process, and the state where the pipe has been pushed into the third contraction die and the processing has been completed. It is a figure which shows the pipe which completed the contraction processing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a tube expansion die and a contraction die according to the present invention and a tube expansion or contraction processing apparatus to which these are applied will be described based on the drawings.
1 to 3 are a plan view, a side view, and a front view, respectively, showing the entirety of a tube expansion or contraction processing apparatus to which a tube expansion die and a contraction die according to the present invention are applied.

  In each drawing, the pipe expanding or contracting apparatus 1 generally includes a steel pipe processing section 2, a carry-in table 3 for carrying in a steel pipe (hereinafter referred to as a pipe) 13, and a carry-out table 4 for carrying out. The pipe 13 is not limited to a steel pipe, but may be another metal material such as copper or aluminum.

  The steel pipe processing unit 2 includes a frame 5, a left gantry 7 for supporting a pipe pressing hydraulic cylinder 6 on the left side in the figure, a right gantry 9 for supporting a release ring pressing hydraulic cylinder 8 on the right side in the figure, and an intermediate position. And a plurality of clamps 10 (see FIG. 5). The extension shaft 11 is attached to the cylinder rod 6 a of the left hydraulic cylinder 6, and the pressing shaft 12 is attached to the cylinder rod 8 a of the right hydraulic cylinder 8. It should be noted that a plurality of types of extension shafts 11 having different lengths are prepared in accordance with changes in the length of the pipe 13.

  Reference numeral 13 denotes a steel pipe (hereinafter, referred to as a pipe) used for a utility pole or the like having a predetermined length to be expanded or contracted. The steel pipe 13 is mounted on a plurality of feed rollers 14 at a position above the frame 5. It is brought into contact with the extension shaft 11 as it rotates. Thereafter, when the pipe 13 is clamped by the clamp 10, the feed roller 14 moves downward to allow the processing of the clamped pipe 13.

  Reference numeral 15 denotes an expansion die, which is mounted on a die mounting substrate 17 provided to be able to reciprocate in a direction orthogonal to the axial direction of the steel pipe processing portion 2 with respect to the right base 9 (see FIGS. 4A and 4B), It includes a first-stage expansion die 15A, a second-stage expansion die 15B, and a third-stage expansion die 15C. Each of the molds 15A to 15C extends in the horizontal direction and is arranged at a predetermined pitch in the vertical direction in the drawing when viewed in a plan view (FIG. 1).

Reference numeral 16 denotes a release ring used for the expansion mold 15 and includes three release rings 16A to 16C. Each of the release rings 16A to 16C is a base portion of each of the expansion molds 15A to 15C as described later. Are fitted and arranged. (See FIGS. 7 to 10)
Reference numeral 21 denotes a first-stage reduced-tube die 21A, a second-stage reduced-tube die 21B, and a third-stage reduced-tube die 21 mounted on the die-mounting board 17 of the right base 9 as well. 21C. Each of the contraction dies 21A to 21C extends in the horizontal direction and is arranged at a predetermined pitch in a plan view (FIG. 1).

As shown in FIGS. 5A and 5B, the clamp 10 includes a pair of clamp arms 10A and 10B pivotally attached to a gantry 22 of the frame 5, and includes a pressing plate with the upward movement of a cylinder rod 24 of a hydraulic cylinder 23. 27 is moved upward, and the clamp arms 10A and 10B rotate in the closing direction via the roller follower 28 to clamp the pipe 13. (See FIGS. 6A and 6B)
In FIG. 2, reference numeral 26 denotes a split-type restraining rod, which restrains the pair of pedestals 7 and 9 from falling down and deforming at the time of expanding or contracting the pipe. The tension can be adjusted by a nut 26a.

Next, details of the tube expansion mold will be described with reference to FIGS.
7 and 8, a first-stage expansion mold 15A includes a disc-shaped mold base 31, a cylindrical core mold 32, a first tip mold 33A, a mold base 31 and a second mold. A plurality of outer ring dies 34A to 34E (outer diameter D1) fitted to the core mold 32 between the first tip dies 33A, and the core dies 32 are stacked in the axial direction for convenience of machining. Although the two overlapped partial core dies 32A and 32B are combined, the invention is not limited to this, and a single member may be used, or three or more core dies may be combined. The mold base 31, the partial core molds 32A and 32B, and the first tip mold 33A are firmly and integrally fixed by sinking bolts 36 to 38. Reference numeral 35 denotes a collar fitted to the base of the core mold 32A.

  Here, the tip side tapered portion of the tip mold 33A having a relatively large taper angle is a guide portion 33a1 that guides the pipe 13 when the pipe 13 is fitted and inserted into the tip mold 33A. The tapered portion 33a2 having an extremely small taper angle is a portion where the pipe 13 is first expanded.

  The outer diameter D1 of the first-stage expansion die 15A is not the same over the plurality of outer ring dies 34A to 34E, and the outer diameter gradually increases from the die tip side toward the root. The outer peripheral taper portion 34a having a slight taper angle (for example, 0.3 to 8.0 degrees) is formed. This makes it possible for the pipe 13 after the pipe expansion process to easily escape from the outer peripheral portion of the first-stage pipe expansion die 15A. In this regard, the same applies to the second-stage and third-stage expansion dies 15B and 15C described later.

  Further, as the material of the first-stage expansion mold 15A, the tip mold 33A and the outer peripheral ring mold 53 that require high hardness are formed by subjecting the SKD11 (JIS standard) material to high-temperature tempering treatment and low-temperature TIC coating treatment, The surface is mirror-finished so that the arithmetic average roughness Ra is, for example, 0.1 or less. The tip mold 33A and the outer ring mold 53 are not limited to the above materials, and may be made of a material such as a cemented carbide having a high hardness. May be cured). The core mold 32 is made of, for example, a quenched and tempered material of S45C (JIS standard). The same applies to the second and third stage expansion dies 15B and 15C below. The low-temperature TIC coating treatment is a treatment in which TIC (titanium carbide) is deposited on a surface of a steel material or the like at a low temperature of 400 to 600 ° C. by a CVD method or a PVD method. It is intended to improve the corrosion resistance and the releasability from the resin.

  Reference numeral 40 denotes a contact pin attached to the release ring 16A by a bolt 41, which is pressed leftward in the figure by the pressing shaft 12 of the cylinder rod 8a of the hydraulic cylinder 8, as described later. As a result, the release ring 16A is guided by the guide rod 42 (fixed to the mold base 31) penetrated through the through hole 16a, slides in the same direction, and removes the pipe 13 after the expansion process from the mold 15A. Separate.

  In FIG. 7, reference numeral 43 denotes a proximity type detection device which detects the position of the release ring 16A, for example, by magnetic induction, and includes a sensor 44 fixedly arranged and a dog 45 attached to the release ring 16A.

  Next, in FIG. 9, the second-stage expansion die 15B has substantially the same configuration as that of the first-stage expansion die 15A, but the second tip die 33B has two-step outer peripheral tapered portions 33b1 and 33b2. The corner and diameter dimensions are different from the dimensions of the corresponding part of the first tip mold 33A, and a plurality of outer ring molds 51A to 51E (outer diameter dimension D2) are provided. The outer peripheral taper portion 51a that is larger than the outer diameter D1 of the outer peripheral ring mold 34 (D2> D1) is formed. 16B is a release ring, and 52 is a collar.

  Next, in FIG. 10, the third-stage expansion mold 15C has substantially the same configuration as the previous expansion molds 15A and 15B, but the third tip mold 33C has a taper angle of the outer peripheral taper portion 33c, and The diameter dimension is different from the dimension of the corresponding part of the front end dies 33A and 33B, and a plurality of outer ring dies 53A to 53E (outer diameter D3) are provided. The outer peripheral taper portion 53a larger than the outer diameter dimension D2 of the mold 51 (D3> D2) is formed. 16C is a release ring, and 54 is a collar. Also, the guide portions of the tip dies 33A and 33B of the first and second stage expansion dies 15A and 15B are provided on the tip side of the outer peripheral tapered portion 33c of the third tip dies 33C of the third stage expansion dies 15C. Although the guide portions 33a1 and 33b1 are not provided, the reason is that the end of the pipe 13 is already expanded to some extent by the processing using the first-stage and second-stage expansion dies 15A and 15B. This is because even if there is no guide portion on the tip side of the third tip mold 33C, the third tip mold 33C can be satisfactorily fitted to the third tip mold 33C. The same applies to the third tip mold 62C (see FIG. 15) of the third-stage constriction mold 21C described later.

  The outer peripheral taper portions 33a2, 33b2, 33c of the tip dies 33A to 33C and the outer peripheral taper portions 34a, 51a, 53a of the outer ring dies 34, 51, 53 have different taper angle values (for example, the former). Is larger than the latter taper angle), so that the pipe 13 is enlarged to a predetermined fitting portion diameter by the former outer peripheral taper portions 33a2, 33b2, 33c, and then the latter outer peripheral taper portions 34a, 51a. , 53a can provide a predetermined taper angle to the fitting portion. However, in some cases, the tapered portions of the tip dies 33A to 33C and the outer peripheral ring dies 34, 51, 53 may have the same taper angle value. The same applies to the relationship between the inner peripheral tapered portion of the distal end cylindrical mold 62 and the inner peripheral ring molds 63, 78, and 79 of the contraction mold described later.

  The point where the taper angle values of the outer peripheral taper portion of the tip mold 33 and the outer peripheral taper portions of the outer ring molds 34, 51, 53 are switched to different values is determined by the tip mold 33 and the outer ring mold. The switching may be performed at a point within the axial dimensional range of the tip mold 33 without being limited to the boundary of 34, or may be performed at a point within the axial dimensional range of each of the outer peripheral ring dies 34, 51, and 53. . About the point where this taper angle value is switched, the same applies to the relationship between the inner peripheral taper portion of the distal end cylindrical mold 62 and the inner peripheral ring molds 63, 78 and 79 of the contraction mold described later.

  Further, the cross-sectional shapes of the outer peripheral tapered portions of the tip mold 33 and the outer ring molds 34, 51, 53 are not limited to straight lines, but may be convex curves or concave curves. This also applies to the inner peripheral taper portions of the distal end cylindrical mold 62 and the inner peripheral ring molds 63, 78, 79 of the contraction mold.

11A and 11B show the outer peripheral ring mold 34 (51, 53).
Next, details of the contraction mold will be described with reference to FIGS.
12 and 13, a first-stage constricted tube mold 21A includes a disc-shaped mold base 31A, a cylindrical outer peripheral mold 61, a first tip mold 62A, and a mold base. A plurality of inner peripheral ring molds 63A to 63D (inner diameter dimension d1) inserted and fitted into the outer peripheral cylindrical mold 61 between the first and second end dies 61A and 62A. For convenience of machining, the two partial outer peripheral cylindrical molds 61A and 61B stacked in the axial direction are combined, but the present invention is not limited to this. A single member may be used, or three or more partial outer peripheral cylindrical molds may be combined. You may. The mold base 31A, the partial outer cylindrical molds 61A and 61B, and the first tip mold 62A are firmly and integrally fixed by sinking bolts 65 to 67. Reference numeral 71 denotes a fixed cylinder that stores a release pressing member 73 described later, and is fixed to the mold base 31A by bolts 72.

  Here, the tip side tapered portion of the tip mold 62A having a relatively large taper angle is a guide portion 62a1 that guides the pipe 13 when the pipe 133 is fitted and inserted into the tip mold 62A. The inner peripheral taper portion 62a2 having an extremely small taper angle is a portion where the pipe 13 is first contracted.

  Also, the inner diameter d1 of the first-stage constricted die 21A is not the same over the plurality of inner peripheral ring dies 63A to 63D, and the inner diameter is gradually reduced from the die tip side toward the root. An inner peripheral tapered portion 63a having a slight taper angle (for example, 0.3 to 8.0 degrees) is formed. This makes it possible for the pipe 13 after the tube contraction to easily come out of the inner peripheral portion of the first-stage contraction mold 21A. In this regard, the same applies to the second-stage and third-stage reduced-tube dies 21B and 21C described later.

  Further, as the material of the first-stage shrinkable tube mold 21A, the tip mold 62A and the inner peripheral ring mold 63 which require high hardness are subjected to high temperature tempering treatment and low temperature TIC coating treatment of SKD11 (JIS standard) material. Later, the inner peripheral surface is mirror-finished so that the arithmetic average roughness Ra is, for example, 0.1 or less. The tip mold 62A and the inner peripheral ring mold 63 are not limited to the above materials, and may be made of a material such as a cemented carbide having a high hardness. In addition to the low temperature TIC coating, other hardening treatments (not only the surface but also the surface) May be cured). The outer peripheral cylindrical mold 61 is made of, for example, a quenched and tempered material of S45C (JIS standard). The same applies to the second-stage and third-stage contracted tube dies 21B and 21C below.

  Reference numeral 73 denotes a release pressing member in which a base plate 74, an intermediate ring 75, and a pressing plate 76A (outer diameter d1) are fixed by bolts 77A and 77B, and the pressing plate 76A is an inner periphery of the inner peripheral ring mold 63. In this state, the key 78 and the key groove 74a are guided by the fitting and can slide back and forth in the left and right directions in the figure. The release pressing member 73 separates the pipe 13 after the completion of the contraction from the mold 21A when pressed by the pressing shaft 12 and slid to the left. Reference numeral 43 denotes a magnetic induction type detection device that detects the position of the release pressing member 73, and includes a sensor 44 disposed on the fixed cylinder 71 and a dog 45 attached to the release pressing member 73.

  Next, in FIG. 14, the second-stage reduced-tube mold 21B has substantially the same configuration as the first-stage reduced-tube mold 21A, but the second tip mold 62B has a two-step inner peripheral tapered portion 62b1 and The taper angle and the diameter of 62b2 are different from the dimensions of the corresponding portion of the first tip mold 62A, and a plurality of inner peripheral ring molds 78A to 78D (inner diameter d2) are provided. Forms an inner peripheral tapered portion 78a smaller than the inner diameter dimension d1 of the inner peripheral ring mold 63 (d2 <d1). The outer diameter of the pressing plate 76B of the release pressing member 73 is also d2.

  Next, in FIG. 15, the third-stage constriction mold 21C has substantially the same configuration as the previous constriction molds 21A and 21B, but the third tip mold 62C has a tapered inner peripheral taper portion 62c. The corner and diameter dimensions are different from the dimensions of the corresponding parts of the front end dies 62A and 62B, and a plurality of inner peripheral ring dies 79A to 79D (inner diameter d3) are provided. An inner peripheral taper portion 79a smaller than the inner diameter dimension d2 of the inner peripheral ring mold 78 (d3 <d2) is formed. The outer diameter of the pressing plate 76C of the release pressing member 73 is also d3.

16A and 16B show the inner peripheral ring mold 63 (78, 79).
Next, a procedure for processing the pipe 13 will be described.
First, in FIGS. 1 to 3, the pipe 13 is carried into the steel pipe processing section 2 from the pipe carry-in table 3, and reaches the coaxial position between the extension shaft 11 and the first-stage expansion mold 15 </ b> A on the feed roller 14. , And is axially moved leftward in the figure by the rotation of the feed roller 14, and abuts on the extension shaft 11. Next, the clamp arms 10A and 10B of the five clamps 10 are closed and rotated by the hydraulic cylinder 23 to clamp the pipe 13 while slightly lifting the pipe 13 to a preset centering position for processing. . At this time, the feed roller 14 is separated from the pipe.

Subsequently, first, a procedure for processing the pipe 13 using the expansion die will be described with reference to FIGS. 17A to 17E.
FIG. 17A shows a state in which the pipe 13 and the first-stage expansion mold 15A are centered coaxially with each other.

  Subsequently, in FIG. 17B, the pressing shaft 12 is moved leftward in the figure by the hydraulic cylinder 8 to move the release ring 16A through the contact pin 40 by a predetermined distance m in the same direction. As a result, the dog 45 of the detection device 43 reaches a position off the sensor 44.

Subsequently, in FIG. 17C, the pressing shaft 12 is moved back to the right in the drawing.
Subsequently, in FIG. 17D, the pipe 13 is pressed and moved to the right in the figure by the hydraulic cylinder 6 via the extension shaft 11 and integrally with the clamp 10, and the tip of the pipe 13 is moved to the first stage expansion mold 15A. The pipe expanding process is started by sequentially riding on the outer peripheral tapered portions 33a1 and 33a2 of the tip mold 33A and further on the outer peripheral tapered portion 34a of the outer ring mold 34.

Subsequently, in FIG. 17E, the distal end of the pipe 13 contacts the release ring 16A.
Subsequently, in FIG. 17F, when the pipe 13 is further pushed rightward in the figure together with the release ring 16A, and the dog 45 of the detection device 43 is positioned corresponding to the sensor 44, the operation of the hydraulic cylinder 6 is stopped by the detection signal. Then, the pipe expanding process of the pipe 13 is completed. At this time, after the clamp of the pipe by the clamp 10 is released, the cylinder rod 6a of the left hydraulic cylinder 6 is moved backward by about 200 mm together with the extension shaft 11 to the left in the drawing.

  Subsequently, in FIG. 17G, the pressing shaft 12 is moved leftward in the figure by the hydraulic cylinder 8 to move the release ring 16A through the contact pin 40 by a predetermined distance in the same direction. As a result, the expanded pipe 13 is separated from the first-stage expansion die 15A, and the first-stage processing is completed.

  Next, a procedure for expanding the pipe 13 stepwise from the first to third stages using the first to third stages of molds 15A to 15C in sequence will be described with reference to FIGS. explain. In this case, switching of the first to third dies 15A to 15C with respect to the pipe 13 is performed in a direction orthogonal to the axis of the processing unit 2 together with the die mounting board 17 to which the dies 15A to 15C are mounted in FIG. And sequentially switched to a position concentric with the axis. Needless to say, the processing is not limited to the three-step processing, but may be processing in one step, two steps, or four or more steps.

  First, FIGS. 18A and 18B show the state of the pipe 13A before the start of the first-stage expansion, and the state of the pipe 13B and the first-stage expansion die 15A at the end of the first-stage expansion, respectively. These correspond to the above-described left portion of FIG. 17A and FIG. 17F.

19A and 19B show the state of the pipe 13B (corresponding to the pipe 13B in FIG. 18B) before the start of the second-stage expansion, and the state of the pipe 13C and the second stage at the end of the second-stage expansion. It is a figure which shows the state of the expansion pipe die 15B (it has an outer peripheral taper part 33b2, 51a), and the inner diameter dimension D1 'of the right end side of the pipe 13B is outside the outer periphery ring die 34 of the 1st stage expansion die 15A. It is almost the same as the diameter D1, but is slightly smaller than D1 due to springback. (D1 '<D1)
Next, FIGS. 20A and 20B show the state of the pipe 13C (corresponding to the pipe 13C in FIG. 19B) before the start of the third stage expansion, and the state of the pipe 13D and the third stage at the end of the third stage expansion, respectively. It is a figure which shows the state of 15 C of expansion pipe dies (it has an outer peripheral taper part 33c, 53a), and the inner diameter dimension D2 'of the right end side of the pipe 13C is outside the outer ring mold 51 of the 2nd-stage expansion die 15B. It is almost the same as the diameter D2, but slightly smaller than D2 due to springback. (D2 '<D2)
Finally, FIG. 21 shows a pipe 13D (corresponding to the pipe 13D in FIG. 20B) finally expanded, and the inner diameter dimension D3 'on the right end side of the pipe 13D is the outer peripheral ring of the third-stage expansion mold 15C. It is almost the same as the outer diameter D3 of the mold 53, but is slightly smaller than D3 due to springback. (D3 '<D3) (D1'<D2'<D3')
The expanded pipe 13 is axially moved and returned to the position shown in FIGS. 1 and 2 and released from the unloading table 4 after the clamp by the clamp 10 is released. 2 and the same processing is repeated.

  Next, a procedure for processing the pipe 13 using the contraction die will be described with reference to FIGS. In FIG. 1 to FIG. 3, when the pipe 13 is carried into the steel pipe processing unit 2 from the carry-in table 2, the contraction dies 21 A to 21 C are sequentially replaced with the axial positions of the processing unit 2 instead of the expansion dies 15. The operation of the clamp 10 and the like is the same. The processing is not limited to the three-step processing, but may be one step, two steps, or four or more steps.

FIG. 22A shows a state in which the pipe 13 and the first-stage constriction mold 21A are centered coaxially with each other.
Subsequently, in FIG. 22B, the pressing shaft 12 is moved leftward in the figure by the hydraulic cylinder 8 to contact the release pressing member 73 to move it by a predetermined distance n in the same direction. As a result, the dog 45 of the detection device 43 reaches a position off the sensor 44.

Subsequently, in FIG. 22C, the pressing shaft 12 is moved back to the right in the drawing.
Subsequently, in FIG. 22D, the pipe 13 is pressed and moved to the right in the figure by the hydraulic cylinder 6, so that the distal end of the pipe 13 becomes the inner peripheral tapered portions 62a1 and 62a2 of the distal end die 62A of the first-stage constriction die 21A. Further, the tube is sequentially pressed against the inner peripheral taper portion 63a of the inner peripheral ring mold 63 to start the tube contraction.

  Subsequently, in FIG. 22E, the tip of the pipe 13 contacts the pressing plate 76A of the release pressing member 73. At this time, after the clamp of the pipe by the clamp 10 is released, the cylinder rod 6a of the left hydraulic cylinder 6 is moved backward by about 200 mm together with the extension shaft 11 to the left in the drawing.

  Subsequently, in FIG. 22F, when the pipe 13 is further pushed rightward in the figure together with the release pressing member 73, and the dog 45 of the detecting device 43 is located at the position corresponding to the sensor 44, the operation of the hydraulic cylinder 6 is performed by the detection signal. The operation is stopped, and the pipe reduction processing of the pipe 13 ends.

  Subsequently, in FIG. 22G, the pressing shaft 12 is moved leftward in the figure by the hydraulic cylinder 8 to contact the release pressing member 73 to move it by a predetermined distance in the leftward direction in the figure. Thereby, the pipe 13 which has been subjected to the contraction processing is separated from the first-stage contraction die 21A, and the first-stage processing is completed.

  Next, a procedure for sequentially reducing the pipe 13 from the first to third stages by sequentially using the first to third stages of the molds 21A to 21C will be described with reference to FIGS. Will be explained. In this case, the switching of the first to third stages of the contraction molds 21A to 21C with respect to the pipe 13 is performed by moving the molds 21A to 21C in a direction orthogonal to the axis of the processing unit 2 in FIG. It is sequentially switched and moved to a position concentric with the axis. Needless to say, the processing is not limited to three steps, but may be two steps or four or more steps.

  First, FIGS. 23A and 23B show the state of the pipe 13A 'before the start of the first-stage contraction, the pipe 13B' and the first-stage contraction mold 21A at the end of the first-stage contraction, respectively. 22A and 22B, which correspond to the left part of FIG. 22A and FIG. 22F described above.

Next, FIGS. 24A and 24B show the state of the pipe 13B '(corresponding to the pipe 13B' in FIG. 23B) before the start of the second-stage tube reduction, and the state of the pipe 13B at the end of the second-stage tube reduction, respectively. It is a figure which shows the state of 13C 'and the 2nd-stage contraction die 21B (having the inner peripheral taper part 62b2, 78a), and the outer diameter dimension d1' of the right end side of the pipe 13B 'is 1st-stage contraction tube It is almost the same as the inner diameter dimension d1 of the inner ring mold 63 of the mold 21A, but slightly larger than d1 due to springback. (D1 '> d1)
Next, FIGS. 25A and 25B show the state of the pipe 13C '(corresponding to the pipe 13C' in FIG. 24B) before the start of the third-stage tube reduction and the state of the pipe 13C at the end of the third-stage tube reduction, respectively. It is a figure which shows the state of 13D 'and the 3rd-stage contraction pipe | tube die 21C (it has an inner peripheral taper part 62c, 79a), and the outer-diameter dimension d2' of the right end side of the pipe 13C 'is the 2nd-stage contraction pipe | tube. It is almost the same as the inner diameter dimension d2 of the inner peripheral ring mold 78 of the mold 21B, but is slightly larger than d2 due to springback. (D2 '> d2)
Lastly, FIG. 26 shows a pipe 13D '(corresponding to the pipe 13D' in FIG. 25B) which has been finally contracted. The outer diameter of the pipe 13D 'at the right end is d3' It is almost the same as the inner diameter d3 of the inner ring mold 79 of the tube mold 21C, but is slightly larger than d3 due to springback. (D3 '> d3) (d1'> d2 '>d3')
The pipe 13 that has been subjected to the contraction processing is axially moved and returned to the position shown in FIGS. 1 and 2, is released from the unloading table 4 after the clamp by the clamp 10 is released, and the next pipe 13 is processed. It is carried into the unit 2 and the same processing is repeated.

  In the embodiment of the pipe expanding process, when the inner diameter portion of the pipe 13 is sequentially expanded by the tip die 33 and the outer ring dies 34, 51, 53, the outer peripheral tapered portions 33a to 33a of the tip die 33 are formed. If the first taper angle of 33c and the second taper angles of the outer peripheral tapered portions 34a, 51a, 53a of the outer peripheral ring molds 34, 51, 53 are set to different numerical values, two different tapers for one pipe 13 are set. It is possible to form an outer peripheral taper portion of the angle value. In some cases, it is possible to form an outer peripheral taper portion having three or more taper angle values. The same applies to the contraction processing.

  Further, in the above-mentioned pipe expanding process, the inner diameter portion of the pipe 13 is sequentially expanded by the outer tapered portions 33a to 33c of the tip mold 33 and the outer tapered portions 34a, 51a, 53a of the outer ring molds 34, 51, 53. However, the present invention is not limited to this. In some cases, the tip mold 33 has only the function of guiding the pipe 13, and the pipe expanding function is performed only by the outer peripheral tapered portions 34 a, 51 a, 53 a of the outer ring dies 34, 51, 53. You may do it. Similarly, in the above-described tube reduction, the tube reduction function of the pipe 13 may be performed only by the inner peripheral tapered portions 63a, 78a, 79a of the inner peripheral ring dies 63, 78, 79.

  In the above-described embodiment of the pipe expansion, the first to third-stage expansion dies 15A to 15C are sequentially applied to one pipe 13, and after the pipe expansion is completed, the next pipe 13 is expanded. However, the present invention is not limited to this. First, the plurality of pipes 13 are expanded by the first-stage expansion mold 15A, and then the plurality of pipes 13 are expanded by the second-stage expansion mold 15B. Thereafter, the plurality of pipes 13 may be expanded by a third-stage expansion die 15C. The same applies to the contraction processing.

DESCRIPTION OF SYMBOLS 1 Pipe expansion or contraction pipe processing apparatus 2 Steel pipe processing part 3 Carry-in table 4 Carry-out table 5 Frames 6, 8, 23 Hydraulic cylinders 6a, 8a Cylinder rods 7, 9, 22 Mount 10 Clamp 10A, 10B Clamp arm 11 Extension shaft 12 Press shaft 13 Steel Pipe 14 Feed Roller 15 (15A to 15C) Expanding Die 16 (16A to 16C) Release Ring 16a Through Hole 17 Die Mounting Board 21 (21A to 21C) Shrinking Die 24 Cylinder Rod 26 Restraining Rod 26a Nut 27 Push plate 28 Roller follower 31, 31A Mold base 32 (32A, 32B) Core mold 33 (33A-33C), 62 (62A-62C) Tip molds 33a, 33b, 33c, 34a, 51a, 53a, 62a, 62b, 62c, 63a, 78a, 79a Tapered portions 33a1, 33b1, 6 2a1, 62b1 Guide portions 34 (34A to 34D), 51 (51A to 51D), 53 (53A to 53D) Outer ring molds 35, 52, 54 Collars 36 to 38, 41, 65 to 67, 72, 77A to 77C Bolt 40 Contact pin 42 Guide rod 43 Detector 44 Sensor 45 Dog 61 (61A, 61B) Outer cylindrical mold 63 (63A-63D), 78 (78A-78D), 79 (79A-79D) Inner ring Mold 71 Fixed cylinder 73 Release press member 74 Base plate 74a Key groove 75 Intermediate ring 76 (76A to 76C) Press plate 78 Key

Claims (20)

In an expansion die for processing to expand the pipe diameter of the pipe (13),
Mold base (31),
A core mold (32) fixed to the mold base (31) and extending in the axial direction;
A tip mold (33) fixed to the tip of the core mold (32);
Between the mold base (31) and the tip mold (33), the outer diameter of the core mold is fitted from the tip mold (33) side to the mold base side. Outer peripheral ring molds (34, 51, 53) having outer peripheral tapered portions (34a, 51a, 53a) having predetermined outer dimensions (D1 to D3) gradually increasing toward
When the inner diameter portion of the tube (13) is pressed against at least the outer peripheral taper portion (34a, 51a, 53a) of the outer peripheral ring mold (34, 51, 53) in the pushing direction, the tube (13). A tube expansion die in which the diameter of the tube is enlarged. The expansion mold according to claim 1,
An expansion mold, wherein the mold base (31), the core mold (32) and the tip mold (33) are integrally fixed to each other by bolts (36 to 38). The expansion mold according to claim 1 or 2,
The outer peripheral ring mold (34, 51, 53) is an expansion mold composed of two or more partial outer peripheral ring molds (34A to 34E, 51A to 51E, 53A to 53E) stacked in the axial direction. . In the expansion mold according to any one of claims 1 to 3,
The tip mold (33) has an outer taper portion (33a2, 33b2, 33c) on the outer periphery, the outer diameter of which gradually increases from the tip side toward the mold base, and the pipe (13). A tube expansion die in which the inner diameter portion of the tube is first expanded by the outer peripheral tapered portions (33a2, 33b2, 33c). The expansion mold according to claim 4,
The outer peripheral taper portions (33a2, 33b2, 33c) of the tip dies (33A to 33C) and the outer peripheral taper portions (34a, 51a, 53a) of the outer ring molds (34, 51, 53) are tapered. An expansion mold with different angle values. The expansion die according to any one of claims 1 to 5,
A tube expanding die, wherein the distal end dies (33A, 33B) have guide portions (33a1, 33b1) for guiding the pipe (13) at the distal end side. The expansion mold according to any one of claims 1 to 6,
At least the tip mold (33) and the outer ring mold (34, 51, 53) are formed by subjecting the SKD11 material to a high-temperature tempering treatment and a low-temperature TIC coating treatment, and then mirror-finishing the outer peripheral surface. A plurality of sets (15A to 15C) of the expansion mold according to any one of claims 1 to 7 are provided for expanding the pipe in a plurality of stages,
The outer diameters (D1 to D3) of the outer ring molds (34, 51, 53) of each set (15A to 15C) are different so as to satisfy a predetermined dimensional relationship (D1 <D2 <D3).
An expansion mold set, wherein the pipe (13) is sequentially expanded by a plurality of sets of expansion molds (15A to 15C) to gradually increase the inner diameter. At least one of the tube expansion dies (15A to 15C) according to any one of claims 1 to 8,
A mold release device (16) provided adjacent to the mold base (31) near the outer periphery of the outer peripheral ring mold (34, 51, 53), wherein the mold release is provided. The member (16) pushes back the pipe (13) that has been subjected to the expanding process in a direction opposite to the pushing direction to separate it from the outer peripheral ring mold (34, 51, 53) and the tip mold (33). Expansion mold equipment. It is an expansion die apparatus of Claim 9, Comprising:
A detection device (1) comprising a first detection member (44) attached to the mold base (31) or a member integral therewith, and a second detection member (45) attached to the release member (16); 43), when the release member (16) is pressed and moved by the pipe (13) to be expanded, the detection device (43) detects the end of the expansion of the pipe (13). , Expansion mold equipment. In a contraction die for processing to reduce the diameter of the tube (13),
Mold base (31A),
An outer peripheral cylindrical mold (61) fixed to the mold base (31A) and extending in the axial direction;
A tip cylindrical mold (62) fixed to the tip of the outer peripheral cylinder mold (61);
Between the mold base (31A) and the distal end cylindrical mold (62), the inner peripheral dimension of the outer peripheral cylindrical mold (61) is fitted and the inner diameter dimension of the distal end cylindrical mold (61) is set. 62) An inner peripheral ring mold (63, 78, 79) having an inner peripheral taper portion (63a, 78a, 79a) having a predetermined inner diameter (d1 to d3) gradually decreasing from the mold base side. And
When the outer diameter portion of the tube (13) is pressed at least against the inner peripheral taper portion (63a, 78a, 79a) of the inner peripheral ring mold (63, 78, 79), A contraction mold in which the diameter of the tube (13) is reduced. The contraction mold according to claim 11,
A contraction mold in which the mold base (31A), the outer cylindrical mold (61) and the tip cylindrical mold (62) are integrally fixed to each other by bolts (65 to 67). The contraction mold according to claim 11 or 12,
The inner peripheral ring mold (63) is a contraction mold composed of two or more partial inner peripheral ring molds (63A to 63D, 78A to 78D, 79A to 79D) stacked in the axial direction. The contraction mold according to any one of claims 11 to 13,
The distal end cylindrical mold (62) has an inner peripheral taper portion (62a2, 62b2, 62c) having an inner diameter gradually decreasing from the distal end side toward the mold base side on the inner periphery. (13) A contraction mold in which the outer diameter portion is first contracted by the inner peripheral taper portions (62a2, 62b2, 62c). The expansion mold according to claim 14,
The inner peripheral taper portion (62a2, 62b2, 62c) of the tip cylindrical mold (62) and the inner peripheral taper portion (63a, 78a, 79a) of the inner peripheral ring mold (63, 78, 79) Tube expansion molds having different taper angle values. The contraction mold according to any one of claims 11 to 15,
A reduced-tube mold, wherein the tip mold (62) has a guide portion (62a1, 62b1) for guiding the pipe (13) at the tip side. The contraction mold according to any one of claims 11 to 16,
At least the tip mold (62) and the inner ring mold (63, 78, 79) are formed by subjecting the SKD11 material to high-temperature tempering treatment and low-temperature TIC coating treatment and then mirror-finishing the inner peripheral surface. Mold. A plurality of sets (21A to 21C) of the contraction mold according to any one of claims 11 to 17 are provided for contracting a tube in a plurality of stages,
The inner diameters (d1 to d3) of the inner ring molds (63, 78, 79) of each set (21A to 21C) are different so as to satisfy a predetermined dimensional relationship (d1>d2> d3).
A shrinking mold set in which the pipe (13) is sequentially shrunk by a plurality of sets of shrinking molds (21A to 21C) and the outer diameter thereof is sequentially reduced. A contraction mold according to any one of claims 11 to 18,
A mold pressing device (73) provided adjacent to the mold base (31A) near the inner periphery of the inner ring mold (63, 78, 79); By the release pressing member (73), the pipe (13) having completed the contraction processing is pushed back in a direction opposite to the pushing direction, and the inner peripheral ring molds (63, 78, 79) and the tip mold (62). ), A constriction mold device. 20. The constriction mold apparatus according to claim 19,
It comprises a first detection member (44) attached to the mold base (31A) or a member (71) integral therewith, and a second detection member (45) attached to the release member (16). A detection device (43), wherein when the release pressing member (73) is pressed and moved by the tube (13) to be contracted, the detection device (43) compresses the tube (13). A contraction mold device that detects the end of pipe processing.

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