JP2012066271A - Apparatus and method for press-forming metal pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform the setup when forming metal pipes having a plurality of kinds of shapes or sizes by the press forming.SOLUTION: Press forming apparatuses 10, 11 of a metal pipe 90 includes holding dies 20a, 20b for holding one end 90b in the longitudinal direction of the metal pipe 90, a plurality of forming dies 30a, 30b consisting of different forming faces 50a1, 50a2, 50a3, 50a4 while corresponding the other end 90a in the longitudinal direction of the metal pipe 90 held by the holding dies 20a, 20b to each stage for press forming step by step, and continuously forming means 32, 34 for continuously executing each press forming step by step by moving at least one set of dies out of the holding dies 20a, 20b and the forming dies 30a, 30b with respect to the other set of dies. The holding dies 20a, 20b are arranged opposite to the forming dies 30a, 30b with the array number smaller than that of the forming dies 30a, 30b.

Description

  The present invention relates to a press forming apparatus and a press forming method for press forming a metal pipe stepwise in a manufacturing process of an upper shaft constituting a steering shaft of an automobile, for example.

  The upper shaft, which is a part for preventing the driver from hitting the steering wheel at the time of a collision, has a cylindrical shape having a plurality of shaft portions having different diameters necessary for mounting the steering wheel.

The shape of the upper shaft can be obtained by press-molding one end of a cylindrical metal pipe that is uniform in the longitudinal direction.
In order to press-mold from a metal pipe into the shape of the upper shaft having the above-described multiple-stage shaft portion, one end of the metal pipe is held by a holding mold (hereinafter referred to as a holding mold) and the other end The part must be press-molded step by step with a plurality of molding dies having different molding surfaces (hereinafter referred to as molding dies).

  Conventionally, in order to press-mold a single metal pipe into the shape of an upper shaft having a plurality of shaft portions with different diameters as described above, a holding mold and a molding mold with different molding surfaces are provided. Press molding was performed using a plurality of press molding apparatuses in the order of molding.

  For this reason, it is necessary to input unmolded products and take out molded products at each stage, which is time consuming and labor intensive and also requires production costs and equipment costs because molding is performed using a plurality of press molding apparatuses.

  As a means for solving the above problems, for example, a plurality of molding dies having different molding surfaces are arranged on a circle in order of molding in one press molding apparatus, and arranged at a position opposite to the molding dies than the molding dies. There is a press molding apparatus and method in which a large number of holding dies are arranged on a circle (see Patent Document 1).

  However, when the press forming apparatus and method of Patent Document 1 are used to continuously press the metal pipes of a small lot, the time during which the apparatus actually performs the press forming is short, but different shapes or sizes. In the case of forming the metal pipes in units of lots, it is necessary to perform the work of replacing the molds for each lot, and there is a problem that it takes time to replace all the molds.

JP-A-8-52528

  Accordingly, an object of the present invention is to provide a press forming apparatus and a press forming method capable of efficiently performing setup when forming metal pipes having different shapes or sizes by press forming.

  The present invention corresponds to each stage in which a holding mold for holding one end portion in the longitudinal direction of a metal pipe and the other end portion in the longitudinal direction of the metal pipe held in the holding die are press-molded step by step. A plurality of molding dies composed of different molds, and at least one of the holding mold and the molding dies is moved with respect to the other mold, and stepwise press molding is continuously performed. A metal pipe press-forming apparatus provided with continuous forming means, wherein the continuous forming means is moved step by step by moving a mold group composed of the plurality of forming dies arranged in the forming order. For each of the molding dies corresponding to the press molding, the opposing moving part that moves in the arrangement direction while facing the metal pipe held by the holding mold on the same axis line is opposed by the opposing moving part. The metal mold in the mold The other end portion of the die is configured to be pressed, and the holding mold is arranged to face the molding die with an arrangement number smaller than the arrangement number of the molding die. It is characterized by.

According to the present invention, it is possible to efficiently perform setup when forming metal pipes having different shapes or sizes by press molding.
The above setup refers to production preparation work such as attaching a mold before starting production of the first lot, exchanging the mold between lots, and removing the mold after the production of the last lot is completed.

  More specifically, the press molding apparatus according to the present invention has a smaller number of holding molds than a conventional press molding apparatus in which a holding mold is disposed more than the number of molding dies disposed, for example. When metal pipes of different shapes and sizes are press-formed in units of lots with a small quantity, the time for replacing the holding mold for each lot can be greatly shortened. That is, the time required for setup such as changing the mold can be greatly reduced.

  As a result, even if multiple types of metal pipes with different shapes or sizes are pressed continuously in small lots, the press forming equipment can be set up efficiently, so press forming productivity Can be improved.

  Further, for example, since the number of holding molds arranged is smaller than that of a conventional press molding apparatus in which holding molds are arranged more than the number of molding dies, the manufacturing cost of the press molding apparatus can be reduced.

As an aspect of the present invention, the holding mold can be arranged to be opposed to the plurality of molding dies.
According to the present invention, since the number of the holding molds arranged is the smallest, the holding mold can be replaced in the shortest time.

  As an aspect of the present invention, the mold group can be a linear array mold group in which a plurality of the molding dies are arranged on a straight line.

  According to the present invention, for example, the apparatus space can be narrower than that of a conventional press molding apparatus in which a molding die and a holding die are arranged facing each other on a circle. The molds can be arranged in series, and the moving distance when performing work such as replacement of the mold or maintenance is short and work efficiency is improved.

Further, as an aspect of the present invention, a mold set is configured by the linear array mold group and the holding mold corresponding to the linear array mold group, and a plurality of the molds are arranged in a direction perpendicular to the array direction. Mold sets can be juxtaposed.
According to the present invention, a plurality of the metal pipes can be formed simultaneously.

  Further, as an aspect of the present invention, at least one of the linearly arranged mold groups may be formed of a mold different from the mold corresponding to the molding order of the other linearly arranged mold groups. it can.

  When the press molding apparatus according to the present invention is used, press molded products having different shapes can be simultaneously press molded by the same press molding apparatus.

  Also, the present invention provides a press molding method for press-molding a metal pipe in stages, an arrangement step of arranging a plurality of molding dies of different molds in the molding order corresponding to each stage of the press molding, and the molding A holding step of holding one end portion of the metal pipe in the longitudinal direction with a holding die having a smaller number of arrangement than the die, and a plurality of the forming dies arranged in the forming order at the opposed moving portions of the continuous forming means After moving the mold group and the metal mold held by the holding mold on the same axis line, the molding mold corresponding to the staged press molding is opposed to the metal pipe. A pressing step of pressing the other end of the metal pipe with the molding die opposed to the opposing moving portion at the press forming portion of the continuous forming means, and forming the moving step and the pressing step In order A press molding method of metal pipe to return.

According to the present invention, it is possible to efficiently perform setup when forming metal pipes having a plurality of different shapes by press molding.
As a result, even if a plurality of types of metal pipes with different shapes are continuously performed in small lots, the press molding apparatus can be set up efficiently, so that the productivity of press molding can be improved. it can.

  According to the present invention, it is possible to efficiently perform setup when forming metal pipes having different shapes or sizes by press molding.

The partially broken front view of a steering shaft. Explanatory drawing of all the processes from a shaping | molding of an upper shaft to a process. Explanatory drawing of the process of shape | molding the several axial part from which a diameter differs in the other end part of metal pipes. The front view of a press molding apparatus. The side view of a press molding apparatus. The bottom view of a raising / lowering board. The top view of a stage. CC expanded partial sectional view of FIG. Explanatory drawing which shows the press operation | movement of 1st press molding. Explanatory drawing which shows the slide operation | movement of 2nd press molding. Explanatory drawing which shows the press operation | movement of 2nd press molding. Explanatory drawing which shows the slide operation | movement of 3rd press molding. Explanatory drawing which shows the press operation | movement of 3rd press molding. Explanatory drawing which shows the slide operation | movement of 4th press molding. Explanatory drawing which shows the press operation of 4th press molding. The front view of the press molding apparatus in other embodiment. The top view of the raising / lowering board in embodiment of FIG. The bottom view of the stage in embodiment of FIG.

Hereinafter, an embodiment of a press molding apparatus 10 and a press molding method according to the present invention will be described with reference to the drawings.
First, the structure and function of the upper shaft 100, the entire manufacturing process, and the plurality of shaft portions 94a, 94b, 94c, 94d, and 94e having different diameters of the upper shaft 100 using the press molding apparatus 10 are staged. The press forming process will be described with reference to FIGS.

  The upper shaft 100 manufactured by the press molding apparatus 10 constitutes the steering shaft 200 together with the lower shaft 110. As shown in FIG. 1, the upper shaft 100 has a shape having a large number of cylindrical portions each having a different diameter and a taper between each cylindrical portion.

  Further, the upper shaft 100 includes a steering wheel mounting portion 101 for attaching a steering wheel (not shown) to one end portion in the longitudinal direction (upper side in FIG. 1), and the other end portion in the longitudinal direction (lower side in FIG. 1). Similarly, a connecting portion 102 for connecting a lower shaft 110 constituting the steering shaft 200 is provided.

  The steering wheel mounting portion 101 is formed with a screw portion 101a, a serration portion 101b, and an annular groove 101d, and a female spline 102a is formed on the inner peripheral surface of the connection portion 102. The female spline 102a engages with the male spline 110a provided at the tip of the lower shaft 110, thereby enabling sliding in the longitudinal direction while preventing relative rotation between the two. Therefore, the impact of the collision is absorbed by the slide at the time of the collision of the automobile, and the danger of the driver hitting the steering wheel strongly can be avoided.

As shown in FIG. 2, the upper shaft 100 is manufactured through three processes from a primary process to a tertiary process.
In the primary process, the other end portion 90a of the metal pipe 90 is placed between a plurality of shaft portions 94a, 94b, 94c, 94d, 94e having different diameters and the shaft portions 94a, 94b, 94c, 94d, 94e. -Press-molded into the shape of the primary process finished product 94 having a pad.

In the subsequent secondary process, a part of the shaft portion 94a of the primary process completed product 94 is reduced in diameter by press molding to form a female spline 102a.
In the final tertiary process, the screw portion 101a, the serration portion 101b, the annular groove 101d, and the like are formed.

  The press forming apparatus 10 is an apparatus used for the above-described primary process. In the primary process, as shown in FIG. 3, the other end 90a of the metal pipe 90 is formed by performing press forming in four stages. Is pressed into the shape of the finished primary process 94.

Next, the configuration of the press molding apparatus 10 will be described with reference to FIGS. 3 and 4 to 8.
As shown in FIGS. 4 and 5, the press molding apparatus 10 includes a stage 21 and a lifting plate 31 that moves up and down with respect to the stage 21.

The stage 21 is horizontally provided at the lower part of the press molding apparatus 10.
The elevating plate 31 is disposed above the stage 21 and supported by four guide rods 40 via a hydraulic elevating cylinder 32 attached to the upper surface of the elevating plate 31 so as to be movable up and down.

  Further, as shown in FIG. 6, a guide rail 33 is attached to the lower surface of the elevating plate 31 facing the stage 21, and the slide plate 36 is slidable horizontally in the front-rear direction B by the guide rail 33. Is retained.

  A slide cylinder 34 is fixed to the rear end of the lifting plate 31 by a cylinder fixing member 38 so as to be along the guide rail 33 outside the guide rail 33. A tip portion 37 a of the cylinder rod 37 of the slide cylinder 34 is attached to a side portion on the front side of the lower surface of the slide plate 36.

  As shown in FIG. 7, two mold cages 22 are provided on the left and right in the center of the upper surface of the stage 21, and the mold cage 22 matches the shape of the outer peripheral surface of the one end 90b of the metal pipe 90. Holding molds 20a and 20b having concave molds are attached detachably upward.

  Further, a total of eight molding dies 30a1, 30a2, 30a3, 30a4, 30b1, 30b2, 30b3, and 30b4 are detachably attached to the lower surface of the slide plate 36 in a detachable manner.

The molding dies 30a (30a1, 30a2, 30a3, 30a4) are arranged in a straight line in this order from the front in the front-rear direction B, and constitute a first mold group 30A.
Similarly, the molding dies 30b (30b1, 30b2, 30b3, 30b4) are linearly arranged in this order from the front in the front-rear direction B, and constitute a second mold group 30B.

The first mold group 30A and the second mold group 30B are provided in parallel on the left and right.
As shown in FIG. 3 and FIG. 8, four molding dies 30a arranged in the front-rear direction B of the first mold group 30A perform press molding of the other end 90a of the metal pipe 90 in four stages. The shapes and sizes of the molding surfaces 50a1, 50a2, 50a3, and 50a4 are different from each other in accordance with the outer shape of the molded product molded at each stage.

The molding dies 30a1 and 30b1 have the same shape and size of the molding surface. Similarly, the molding dies 30a2 and 30b2 have the same shape and size of the molding surface, and the molding dies 30a3 and 30b3 have the same shape and size. Have the same shape and size of the molding surface. On the other hand, the molding dies 30a4 and 30b4 have different configurations and shapes of molding surfaces.
The holding molds 20a and 20b and the molding mold 30a30b have a shape in which opposing portions are fitted (see FIG. 9).

  The range of movement of the slide plate 36 in the vertical direction A is such that the metal pipe 90 as shown in FIG. 8 can be inserted into the holding molds 20a and 20b, so that the holding molds 20a and 20b and the molding mold 30a described above are inserted. , 30b to the height of fitting.

  The range of movement of the slide plate 36 in the front-rear direction B is such that the molding dies 30a4 and 30b4 are respectively located from the positions where the molding dies 30a1 and 30b1 are located immediately above the holding dies 20a and 20b (shown by the solid lines in FIG. 6). Up to a position (a state indicated by an imaginary line in FIG. 6) that comes directly above the holding molds 20a and 20b.

  Further, a positioning pin cylinder 35 is provided on the lower surface of the lifting plate 31 facing the stage 21 so as to face one side of the slide plate 36. Further, on one side of the slide plate 36, concave portions 32a1, 32a2, 32a3, and 32a4 are provided at positions corresponding to the molding dies 30a and 30b.

When the pin 35a of the positioning pin cylinder 35 is engaged with the recesses 32a1, 32a2, 32a3, 32a4, the molding dies 30a, 30b are fixed so as not to slide in the front-rear direction B immediately above the holding dies 20a, 20b. The
Note that driving patterns of the lifting cylinder 32, the sliding cylinder 34, and the positioning pin cylinder 35 are controlled by a control unit (not shown).

  Next, a molding method for manufacturing the above-described primary process finished product 94 from the metal pipe 90 using the press molding apparatus 10 will be described with reference to FIGS. 3 and 8 to 15.

  The molding dies 30a1 and 30b1 perform the first press molding shown in FIG. 3 to mold the primary molded product 91 from the metal pipe 90. Subsequently, the molding dies 30a2 and 30b2 perform the second press molding to form the secondary molded product 92 from the primary molded product 91.

  Further, the molding dies 30a3 and 30b3 perform the third press molding to form the tertiary molded product 93 from the secondary molded product 92. Finally, the molding dies 30a4 and 30b4 perform the fourth press molding to mold the primary process completed product 94 from the tertiary molded product 93.

  Below, the operation | movement in each press molding which the above-mentioned 1st metal mold | die group 30A performs is explained in full detail. The second mold group 30B is also press-molded at the same time by the same method, so the description and drawings are omitted.

  In the first press molding, first, one end portion 90b of the metal pipe 90 is inserted into the holding mold 20a as shown in FIG. At this time, the molding die 30a1 is fixed so as to be positioned immediately above the holding die 20a by the positioning pin cylinder 35 engaging with the recess 32a1.

Next, when molding, as shown in FIG. 9, the molding die 30a1 is lowered toward the holding die 20a by the lifting cylinder 32, and the other end 90a of the metal pipe 90 is placed inside the molding die 30a1. The first intermediate shaft portion 91a is formed by narrowing the other end portion 90a in the radial direction while being inserted into the first intermediate shaft portion 91a. Note that one end portion 90b of the metal pipe 90 is merely inserted into the holding mold 20a, and thus is not molded and becomes the first shaft portion 94a.
The diameter of the first intermediate shaft portion 91a is smaller than the diameter of the first shaft portion 94a, and a taper portion is interposed between the first shaft portion 94a and the first intermediate shaft portion 91a.

  When shifting to the next second press molding, as shown in FIG. 10, first, the positioning pin cylinder 35 is detached from the recess 32 a 1, and the molding die 30 a 2 is slid forward by the sliding cylinder 34, so that the positioning pin cylinder 35 The pin 35a is engaged with the recess 32a2, and the molding die 30a2 is fixed so as to be positioned immediately above the holding die 20a. On the other hand, the primary molded product 91 is kept in the holding mold 20a.

  Next, when molding, as shown in FIG. 11, the molding die 30a2 is lowered toward the holding mold 20a by the lifting cylinder 32, and the first intermediate shaft portion 91 of the primary molded product 91 is moved in the radial direction. By narrowing down, the second intermediate shaft portion 92a and the third shaft portion 94c are formed in the first intermediate shaft portion 91a. In addition, the part which was not shape | molded only by having been inserted in the shaping die 30a2 of the 1st intermediate shaft part 91a becomes the 2nd shaft part 94b.

  The diameter of the second intermediate shaft portion 92a is smaller than the diameter of the second shaft portion 94b, and a taper portion is interposed between the second intermediate shaft portion 92a and the second shaft portion 94b. Further, the diameter of the third shaft portion 94c is smaller than the diameter of the second intermediate shaft portion 92a, and a taper portion is interposed between the third shaft portion 94c and the second intermediate shaft portion 92a.

  When shifting to the next third press molding, as shown in FIG. 12, first, the pin 35a of the positioning pin cylinder 35 is disengaged from the recess 32a2, and the molding die 30a3 is slid forward by the sliding cylinder 34, and the positioning pin The pin 35a of the cylinder 35 is engaged with the recess 32a3, and the molding die 30a3 is fixed so as to be positioned immediately above the holding die 20a. On the other hand, the secondary molded product 92 is kept in the holding mold 20a.

Next, when molding, as shown in FIG. 13, the molding die 30a3 is lowered toward the holding mold 20a by the lifting cylinder 32, and the second intermediate shaft portion 92 of the secondary molded product 92 is moved in the radial direction. By narrowing down, the third intermediate shaft portion 93a is formed in the second intermediate shaft portion 92a. In addition, the part which was not inserted | molded only by having been inserted in the shaping die 30a3 of the 2nd intermediate shaft part 92a becomes the 4th intermediate shaft part 93b.
The diameter of the third intermediate shaft portion 93a is smaller than the diameter of the fourth intermediate shaft portion 93b, and a taper portion is interposed between the third intermediate shaft portion 93a and the fourth intermediate shaft portion 93b.

  When shifting to the final fourth press molding, as shown in FIG. 14, first, the pin 35a of the positioning pin cylinder 35 is detached from the recess 32a4, and the molding die 30a4 is slid forward by the sliding cylinder 34, and the positioning pin The pin 35a of the cylinder 35 is engaged with the recess 32a4, and the molding die 30a4 is fixed so as to be positioned immediately above the holding die 20a. On the other hand, the tertiary molded product 93 is held in the holding mold 20a.

Next, when molding, as shown in FIG. 15, the molding die 30 a 4 is lowered toward the holding mold 20 a by the lifting cylinder 32, and the fourth intermediate shaft portion 93 a of the tertiary molded product 93 is moved in the radial direction. By narrowing down, the fourth shaft portion 94d and the fifth shaft portion 94e are formed.
The diameter of the fourth shaft portion 94d is the same as the diameter of the fourth intermediate shaft portion 93b, and the diameter of the fifth shaft portion 94e is smaller than the diameter of the fourth intermediate shaft portion 93a.

  After completion of the fourth press molding, the pin 35a of the positioning pin cylinder 35 is disengaged from the recess 32a4, the molding die 30a1 is slid rearward by the slide cylinder 34, and the pin 35a of the positioning pin cylinder 35 is engaged with the recess 32a1. Thus, the molding die 30a1 is fixed so as to be positioned immediately above the holding die 20a, and the initial press molding is returned to the initial position.

  The primary process finished product 94 formed by the series of press molding described above is taken out from the holding mold 20a, the next unformed metal pipe 90 is inserted into the holding mold 20a, and a series of press molding is repeated.

By forming the metal pipe 90 by the press forming apparatus 10 and the press forming method described above, the following various effects can be obtained.
First, when this press molding apparatus 10 is used, when preparing a plurality of types of press-molded products having different shapes or sizes by press molding, setup is a preparation work for production of the next lot such as replacement of a mold. Can be performed efficiently.

  More specifically, the press molding apparatus 10 has, for example, a plurality of types of holding molds 20a and 20b as compared with the conventional press molding apparatus in which the holding molds are arranged more than the number of molding dies arranged. When the metal pipes 90 having different shapes and sizes are press-formed in units of lots with a small quantity, the time for replacing the holding dies 20a and 20b for each lot can be greatly shortened.

  As a result, even if a plurality of types of metal pipes 90 having different shapes or sizes are formed continuously in small lots, the press forming apparatus 10 can be set up efficiently. It is possible to improve the performance.

  In addition, the press molding apparatus 10 has a smaller number of arrangements of the holding molds 20a and 20b than a conventional press molding apparatus that arranges the holding molds more than the number of molding dies, for example. Costs can be reduced.

  Further, the press molding apparatus 10 has a smaller apparatus space than, for example, a conventional press molding apparatus in which a molding die and a holding die are arranged to face each other on a circle, and therefore, one molding die 30a1, 30b1. A plurality of molding dies 30a, 30b can be arranged in series within the installation width of the, so that the moving distance when the molding dies 30a, 30b are replaced and maintenance is performed is short, and the working efficiency is improved.

  Further, since the press molding apparatus 10 includes the molding die 30a and the holding die 20a, and the molding die 30b and the holding die 20b, a plurality of metal pipes 90 can be simultaneously molded.

  Furthermore, the press molding apparatus 10 has different shapes by forming the molding die 30b and the holding die 20b into molds having molding surfaces having different shapes and sizes with respect to the molding die 30a and the holding die 20a. The press-molded product can be simultaneously press-molded by the same press molding apparatus 10.

In correspondence between the configuration of the present invention and the above-described embodiment,
The press molding part of this invention corresponds to the lifting cylinder 32 of the embodiment,
Similarly,
The opposing moving part corresponds to the sliding cylinder 34,
The mold groups correspond to the first mold group 30A and the second mold group 30B,
The mold corresponds to the molding surfaces 50a1, 50a2, 50a3, 50a4,
The arrangement direction corresponds to the front-rear direction B,
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

  For example, as shown in FIGS. 16 to 18, only the holding mold 20 a and the first mold group 30 </ b> A may be provided, and the other configuration may be the same press molding apparatus 11 as the above-described press molding apparatus 10. In this embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Since the press molding apparatus 11 includes only one holding mold 20a, the holding mold 20a can be replaced in the shortest time. Moreover, the press molding apparatus 11 is an apparatus that takes up the least space.

  Moreover, although the example which manufactures the upper shaft 100 was demonstrated in the above-mentioned embodiment, the press molding apparatuses 10 and 11 are obtained by press-molding metal pipes, such as a change lever of a motor vehicle, in steps. It can also be used to produce many molded products.

  The press molding apparatuses 10 and 11 are apparatuses that perform four-stage press molding, but of course, the press molding apparatuses 10 and 11 are not limited thereto, and may be, for example, apparatuses that perform press molding in five stages, six stages, etc. by increasing the number of molding dies. Can be used.

  The press molding apparatus 10 includes two first mold groups 30a and second mold groups 30b arranged in parallel. The press molding apparatus 11 includes only the first mold group 30a. However, the present invention is not limited thereto, and for example, a configuration having three or four mold groups arranged in parallel may be adopted.

  The present invention can be used in a press molding apparatus and a press molding method for press-molding a metal pipe stepwise into molded products having different diameters.

DESCRIPTION OF SYMBOLS 10,11 ... Press molding apparatus 20a, 20b ... Holding mold 30A ... 1st mold group 30B ... 2nd mold group 30a1, 30a2, 30a3, 30a4, 30b1, 30b2, 30b3 30b4 ... molding die 32 ... lifting cylinder 34 ... slide cylinders 50a1, 50a2, 50a3, 50a4 ... molding surface 90 ... metal pipe 90a ... other end 90b ...・ One end B ・ ・ ・ Front-back direction

Claims (6)

A holding mold for holding one end of the metal pipe in the longitudinal direction;
A plurality of molding dies configured with different molds corresponding to each stage of stepwise press-molding the other end in the longitudinal direction of the metal pipe held in the holding mold;
Metal pipe press provided with continuous forming means for continuously performing stepwise press forming by moving at least one of the holding mold and the forming mold with respect to the other mold A molding device,
The continuous molding means,
Identical to the metal pipe held by the holding mold for each of the molding dies corresponding to the stepwise press molding by moving a group of the plurality of molding dies arranged in the molding order An opposing moving part that moves in the arrangement direction while facing on the axis,
A press molding unit configured to press the other end of the metal pipe with the molding die opposed by the opposing moving unit;
The holding mold,
A metal pipe press molding apparatus configured to be arranged opposite to the molding die with an arrangement number smaller than that of the molding die. The holding mold,
The press molding apparatus according to claim 1, wherein the press molding apparatus is configured so as to be opposed to the plurality of molding dies. The mold group,
The press molding apparatus according to claim 1, wherein the plurality of molding dies are linearly arranged dies arranged in a straight line. A mold set is configured by the linear array mold group and the holding mold corresponding to the linear array mold group, and the plurality of mold groups are juxtaposed in a direction perpendicular to the array direction. 3. The press molding apparatus according to 3. At least one of the molds of the linear array mold group,
The press molding apparatus according to claim 4, wherein the other linear array mold group is configured by a mold different from the corresponding mold in the molding order. In a press molding method for press molding a metal pipe in stages,
An arrangement step of arranging a plurality of molding dies of different molds in the molding order corresponding to each stage of the press molding,
A holding step of holding one end portion of the metal pipe in the longitudinal direction with a holding die having a smaller number of arrangement than the molding die;
A moving step of moving the mold group composed of a plurality of the molding dies arranged in the molding order at the opposed moving part of the continuous molding means;
After facing the metal pipe held by the holding mold on the same axis line with the forming mold corresponding to the stepwise press forming, the facing is performed at the press forming portion of the continuous forming means. A pressing step of pressing the other end of the metal pipe with the molding die opposed to the moving part,
A metal pipe press forming method in which the moving step and the pressing step are repeated in the order of forming.

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