JP2001212619A - Device for manufacturing pipe and middle forming product used for manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing a pipe which can be stably manufactured without varying so that a joint can be in close contact by press forming in mass production. SOLUTION: The device has a processing device body 21 in which a middle forming product 14 having a bigger angle made by an adjacent composing wall portion 16 and a bending portion than an angle when a pipe 1 is completed is set with the joint in a noncontact state. The processing device body 21 has a fixed die 24 comprising a fixed plate 24 on which the middle forming product 14 is placed and pressing punch members 27 which are set on the fixed plate 24 to be able to slide and which press a pair of the adjacent composing wall portions 16 in the approaching direction each other. In the pressing punch member 27 a frictional contact member 27c is equipped to control the rise of the middle forming product 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of manufacturing a pipe by bending a metal plate.

[0002]

2. Description of the Related Art Conventionally, as a technique for manufacturing a pipe body, for example, a prismatic pipe body by bending a metal plate, a technique described in Japanese Patent Application Laid-Open No. 11-290940 is known.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. 11-290940, a rectangular pipe body is formed by pressing a rectangular metal plate as a raw material.

[0004] In this method for processing a prismatic pipe body, both ends (a pair of sides) in the width direction of the metal plate are bent at right angles in the length direction (the direction in which the sides extend) and in the same direction. Opposing flange (joint wall)
A first bending step of forming a primary molded product having a bottom plate portion connecting the flange portions facing each other, and forming a concave curved surface having a predetermined width along the length direction on the bottom plate portion of the primary molded product; A second bending step of bending both ends of this concave surface inward at substantially right angles to form a secondary molded product having a pair of side walls facing each other and having a substantially U-shaped cross section; A restriking process of pressing the pair of side walls toward each other and abutting the end faces (joints) of the pair of flange portions (joint-forming wall portions).

[0005] According to the method of processing a prismatic pipe body, when forming the secondary molded product, the concave curved surface formed on the bottom plate portion of the secondary molded product presses the pair of side walls toward each other. In order to achieve the function of suppressing the spring-back force generated by this, a prismatic pipe body having a rectangular cross section in which the end surfaces of the flange portions are in close contact with each other can be manufactured only by press molding without welding the end surfaces of the flange portions.

[0006]

However, in this conventional method of processing a prismatic pipe body, when forming the secondary molded product, the concave curved surface formed on the bottom plate portion of the secondary molded product has a pair of side walls. Although it has the function of suppressing the springback force generated by pressing the portions toward each other inward, the springback force that tries to open outward remains on the pair of side walls, and mass production Occasionally, the end faces of the flange (joint wall) are joined (joint)
It is difficult to stably produce a prismatic pipe body with close contact without variation.

That is, when an inspection is performed to determine whether or not the end surfaces of the flange portions of the prismatic pipe body manufactured by this processing method are in close contact with each other, there is a case where the end surfaces are in close contact with each other. In some cases, there is a gap at the joint due to the springback force existing on the side wall.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe capable of stably producing a pipe body in which seams are in close contact by press molding during mass production. An object of the present invention is to provide an apparatus for manufacturing a body and an intermediate molded product of a pipe body used for manufacturing the body.

[0009]

According to a first aspect of the present invention, there is provided an apparatus for manufacturing a pipe body, comprising: a rectangular metal plate as a raw material; a plurality of component walls and joints; A closed cross section which is adhered based on a force is used to form a square pipe body, and a seam forming wall portion to which the seam belongs by bending a plurality of portions of the metal plate along a direction along the side thereof. And a pair of adjacent component wall portions adjacent to the one component wall portion having a pair of bent portions formed on both sides of the flat portion, and the seam is in a non-contact state, and An angle between the wall and the bent portion has a processing device main body on which an intermediate molded product is set larger than an angle when the pipe body is completed, and the processing device main body has a fixed mold, The fixed type is A fixed plate on which the intermediate molded product is placed with a gap between the flat portion and the flat portion, and a pair of adjacent component wall portions slidably mounted on the fixed plate and approaching each other. A pressing punch member for pressing in a direction in which the flat portion is brought into contact with the fixed plate based on the pressing of the pair of adjacent constituent walls when the pressing punch member is deformed in a contact direction. Abutment of the one component wall portion on the fixed plate against a reaction force generated and a reaction force generated by maintaining flatness of the one component wall portion after the flat portion abuts on the fixed plate. A friction contact member is provided so as to contact the bent portion of the seam forming wall portion and to suppress the rise of the intermediate molded product due to pressurization of the pair of adjacent constituent wall portions so that the state is maintained. It is characterized by.

[0010] According to a second aspect of the present invention, there is provided an apparatus for manufacturing a pipe body.
A rectangular metal plate is used as a raw material, and has a plurality of component walls and joints, and the joints are used to form a square pipe body having a closed cross-section that is closely adhered based on a springback force, A wall having a pair of bent portions formed on both sides of a seam forming wall to which the seam belongs and a flat portion by bending a plurality of portions of the metal plate along a direction along the side thereof; A pair of adjacent component walls adjacent to the wall, and the seam is in a non-contact state, and the angle between the adjacent component wall and the bent portion is smaller than the angle when the pipe body is completed. The processing apparatus main body has a fixed die, and the fixed die opens a gap between the pair of bent portions and the flat portion. The intermediate molded product is placed A fixing plate, and a pressing punch member slidably mounted on the fixing plate and pressing the pair of adjacent constituent walls in a direction approaching each other. The reaction force generated when the flat portion is deformed in the contact direction with the fixed plate based on the pressing of the component wall portion, and the flatness of the one component wall portion after the flat portion contacts the fixed plate. The pair of engaging members are engaged with the bent portion of the joint forming wall portion so that the one component wall portion is maintained in contact with the fixing plate against a reaction force generated by maintaining the pair. An engagement protrusion for suppressing the rise of the intermediate molded product due to the pressure of the adjacent component wall portion is provided.

[0011] The apparatus for manufacturing a pipe body according to claim 3 is
3. The pipe body manufacturing apparatus according to claim 1, wherein a shape of the closed cross section of the pipe body is a rectangle, and each component wall of the pipe body constitutes each side of the rectangle and the intermediate portion. 4. A bottom wall corresponding to one component wall of the molded product, a pair of side walls corresponding to a pair of adjacent component walls of the intermediate molded product, and an upper wall corresponding to the joint configuration wall of the intermediate molded product; It is characterized by consisting of.

[0012] According to a fourth aspect of the present invention, there is provided a pipe manufacturing apparatus.
The manufacturing apparatus for a pipe body according to claim 1, wherein the processing apparatus main body has a movable mold that is movable to face the fixed mold, and the movable mold includes a movable plate and a movable plate. A driving member provided to move the pair of pressure punch members in a direction to approach each other.

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a pipe body.
5. The apparatus for manufacturing a pipe body according to claim 4, wherein the pair of pressurizing punch members stop moving while maintaining a pressing force in a state where the one component wall portion is in contact with the fixed plate. And

According to a sixth aspect of the present invention, there is provided an apparatus for manufacturing a pipe body.
5. The pipe manufacturing apparatus according to claim 4, wherein the pair of pressurizing punch members have an engagement tapered portion and are urged in directions away from each other, and the driving member engages with the engagement taper portion. The pair of pressure punch members are movable in directions approaching each other by the engagement taper portion and the taper portion of the driving member.

According to a seventh aspect of the present invention, there is provided a pipe manufacturing apparatus.
3. The pipe manufacturing apparatus according to claim 1, wherein the seam is located at a center of the seam forming wall portion. 4.

An apparatus for manufacturing a pipe body according to claim 8 is
3. The pipe manufacturing apparatus according to claim 1, wherein the seam is located between the seam forming wall portion and the adjacent structure wall portion. 4. The joint may be located at the apex of the three component walls.

According to a ninth aspect of the present invention, there is provided a pipe manufacturing apparatus,
The pipe manufacturing apparatus according to claim 1 or 2, wherein the closed cross section of the pipe is triangular, pentagonal, or hexagonal.

According to a tenth aspect of the present invention, there is provided the pipe body manufacturing apparatus according to the first or second aspect, wherein the pipe body is processed by an extension amount when the metal plate is bent. It is characterized by being performed in anticipation.

An intermediate molded article of a pipe body according to the present invention has a plurality of component walls and joints made of a rectangular metal plate, and the joints are closely adhered by springback force. A closed cross section is used to form a square pipe body, and a plurality of portions of the metal plate are bent along a direction along the side thereof so that the seams belong to both sides of a seam forming wall portion and a flat portion. It has one component wall portion formed with a pair of bent portions, and a pair of adjacent component wall portions adjacent to the one component wall portion, and the seam is in a non-contact state, and the adjacent component wall portion and the bent portion Is larger than the angle when the pipe body is completed.

According to the present invention, it is possible to stably produce a pipe body in which seams are in close contact by press molding during mass production without variation. Table of contents (1) [Pipe body] (2) [Method of manufacturing pipe body] (a) [Primary intermediate molded article used for manufacturing pipe body] (b) [Secondary intermediate molded article used for manufacturing pipe body (3) [Pipe body manufacturing device] (4) [Explanation of operation of pipe body] (5) [Other angular shapes of pipe body] (6) [Modified example of prismatic pipe body] (7) [ Usage example of pipe body]

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) [Pipe Body] FIG. 1 is a perspective view showing a schematic configuration of a pipe body having a prismatic closed section, and FIG. 2 is a side view of the prismatic pipe body. I have.

1 and 2, reference numeral 1 denotes a pipe. The pipe body 1 here has a closed cross-sectional geometric shape of a quadrangle, for example, a square. The pipe body 1 has four (plural) bottom wall portions 2 as constituent wall portions, a pair of adjacent side wall portions 3 and 4 adjacent to the bottom wall portion 2, and an upper wall portion facing the bottom wall portion 2. It consists of five.

The upper wall 5 is composed of a pair of jointed walls 5a,
5b, end surfaces 5c and 5d of a pair of seam forming wall portions 5a and 5b are in close contact with each other, and a seam 5e is formed at the center of the upper wall portion 5. (2) [Method of manufacturing prismatic pipe body] The pipe body 1 is formed by pressing using a rectangular metal plate 6 shown in FIG. Screw holes 6a, 6a are formed in advance in the metal plate 6 as mounting engagement recesses at appropriate positions. The screw holes 6a, 6a are formed by using the pipe body 1 as a support means to be described later and a copying machine (not shown). Used when attaching to. In addition, a notch may be provided as a mounting engagement concave portion instead of the screw holes 6a, 6a.

(A) [Primary Intermediate Molded Product Used for Manufacture of Pipe Body] First, as a first processing step, a pair of seam forming wall portions 5 to which seams 5e belong using the metal plate 6 are used.
a, 5b, a pair of sides 6b, 6b of the metal plate 6 are bent along a fold line 6 extending along the sides.
c and 6c are bent at a right angle (90 degrees) and in the same direction in the same direction to stand up, and as shown in FIG. 4, the jointed walls 5a, 5b are opposed to each other in the direction in which the sides 6b, 6b extend. The elongated primary intermediate product 8 is formed by press working. In FIG. 4, reference numeral 9 denotes an unfolded portion.

In the press working of this primary intermediate molded product 8,
For example, a press device 10 shown in FIG. The press device 10 is roughly composed of a fixed plate 11, a pressure punch member 12, and a movable plate 12 '. The movable plate 12' is slidably provided in a recess of the fixed plate 11. The movable plate 12 ′ is urged vertically upward by the hydraulic pressure of a press device main body (not shown). The metal plate 6 is placed on the movable plate 12 ′ and floats at a distance H from the fixed plate 11. A pressure punch member 12 'is opposed above the movable plate 12'.

The pressing punch member 12 is lowered, and the metal plate 6 is pressed while being held between the movable plate 12 'and the pressing punch member 12 as shown in FIG. Is formed.

(B) [Secondary Intermediate Molded Product Used for Manufacturing Pipe Body] Next, as a second processing step, the unfolded portion 9 of the primary intermediate molded product 8 is folded along folding lines 6d, 6d shown in FIG. Is bent to form the secondary intermediate molded product 14 shown in FIGS. The dimensions of the metal plate 6 and the positions of the bending lines are designed in consideration of the amount of extension of the metal plate 6 due to press working.

Thus, the joint-forming wall portions 5a, 5a
One constituent wall portion 15 corresponding to the bottom wall portion 2 as a remaining constituent wall portion other than b, and a pair of side wall portions 3 adjacent to the bottom wall portion 2,
A pair of adjacent component walls 16, 16 corresponding to 4 are formed. The joint 5e of the secondary intermediate product 14 is not in close contact.

As shown in the enlarged view of FIG. 6B, one of the constituent walls 15 has a flat portion 15a, a flat portion 15b, and a curved portion 1.
5c, the curved portion 15c is located between the flat portion 15a and the flat portion 15b, and the flat portion 15a is
Adjacent to 6.

The pair of flat portions 15a and the adjacent component wall portion 1
6 is larger than the angle θ (see FIG. 2) between the bottom wall 2 and the pair of side walls 3 and 4 when the pipe 1 is completed. Here, the angle θ is 90 degrees,
The angle θ1 is an obtuse angle. By providing the pair of bent portions 15a in this manner, when the bottom wall 2 is formed by using a manufacturing apparatus described later, the adhesion of the joint 5e and the flatness of the bottom wall 2 can be ensured. Also, the angle θ1
Are the same, by providing the curved portion 15c, it is possible to increase the opening amount of the jointed wall portions 5a and 5b.

The secondary intermediate molded product 14 shown in FIGS.
For example, a press device 17 shown in FIG. The press device 17 is a fixed plate 1
9, a pressing punch member 20, and a movable plate 20 '. The movable plate 20 'is the fixed plate 19
Are slidably provided in the recesses and are urged upward in the vertical direction by hydraulic pressure of a press device body (not shown).

The peripheral wall 19a of the recess of the fixing plate 19 is tapered, and the angle between the peripheral wall 19a of the recess and the upper surface of the fixing plate 19 is substantially equal to θ1. The pressing punch member 20 has a punch portion 20a, and a peripheral wall 20b of the punch portion 20a has a shape corresponding to the concave peripheral wall 19. The lower surface of the punch portion 20a has a concavely upward shape so as to form the shape of the one component wall portion 15 of the intermediate molded product 14. Movable plate 2
The upper surface 20'a of 0 'has a convex upward shape corresponding to the shape of the lower surface of the punch portion 20a.

The primary intermediate 8 is placed on the movable plate 20 ′ and floats with a gap H ′ from the fixed plate 19. The pressure punch member 20 ′ is lowered, and pressure is applied while holding one wall of the primary intermediate product 14 between the movable plate 20 ′ and the pressure punch member 20 as shown in FIG.

Thus, the secondary intermediate molded product 14 is formed. Next, the pressure punch member 20 is raised, and
6, the secondary intermediate molded product 14 is pulled out from the pressing punch member 20 in the longitudinal direction orthogonal to the paper surface, and the secondary intermediate molded product 14 is
Remove from 0.

In the pressing device 17 shown in FIG. 8, the secondary intermediate molded product 14 is pulled out from the pressure punch member 20, but as shown in FIG. The angle θ2 formed between the portion 16 and the bottom wall portion 15 is determined by the adjacent component wall portion 16 of the secondary intermediate molded product 14 shown in FIGS.
If the angle θ1 is larger than the angle θ1 between the pressure punch member 20 and the component wall portion 15, the secondary intermediate molded article 14 can be removed from the pressure punch member 20 only by raising the pressure punch member 20. The operation step of pulling out the next intermediate molded product 14 from the pressing punch member 20 in the longitudinal direction can be omitted, and the efficiency of the molding operation can be improved accordingly. Here, the case where the shape of the closed cross section of the pipe body 1 is a square is described. However, when the shape of the closed cross section is a rectangle as shown in FIG. 16 lengthened,
Since the opening amount of the pair of joint forming walls 5a, 5a constituting the upper wall 5 corresponding to the short side of the rectangle becomes large, the adjacent forming wall 16 and the one forming wall 15 of the second intermediate molded article 14 are formed. Pressure member 20 even when the angle between
The secondary intermediate molded article 14 can be removed from the pressure punch member 20 only by raising the pressure. (3) [Pipe Body Manufacturing Apparatus] Next, in order to form the secondary intermediate product 14 into a pipe body 1 as a finished product, it is set in a press forming apparatus (processing apparatus main body) 21 shown in FIG. .

The press forming apparatus 21 is a lower mold (fixed mold).
22 and an upper die (movable die) 23. Lower mold 22
Has a fixed plate 24, and the upper mold 23 has a movable plate 2
5 The fixed plate 24 is provided with a pair of stopper members 26, 26 and a pair of pressure punch members 27, 27. The pressure punch members 27, 27 are slidably provided on a slide rail (not shown) and are urged in a direction away from each other by a spring member (not shown). The pressing punch members 27, 27 are movable on the sliding rail in a direction in which the pressing punch members 27 move away from and approach each other. The secondary intermediate product 14 shown in FIG. 6 is configured such that one component wall 15 faces downward so that the opposing spaces 28 of the pressing punch members 27 and 27 are formed.
Is set to Driving members 29, 29 for driving the pressing punch members 27, 27 are attached to the movable plate 25.

At the lower end of the driving members 29, 29, tapered portions 29a, 29a are formed.
Tapered portions 27a, 27a engaging with the tapered portions 29a, 29a are formed at the upper end portions of 7, 27. Also, the punch surfaces 27b, 27 of the pressure punch members 27, 27
b is provided with friction contact members 27c, 27c.

FIG. 11 shows a state in which the lower mold 24 and the upper mold 25 are separated from each other, and the secondary intermediate product 14 is set in the facing space 28. As shown by an arrow A1, the upper mold 23 is disengaged. When lowered, as shown in FIG.
9, the pressure punch member 27,
27, the pressing punch members 27, 27 are moved in a direction approaching each other, and the friction contact members 27c, 27c of the pressing punch members 27, 27 are connected to the adjacent constituent wall portions 16, 16. And joint wall portions 5a, 5b
Abuts on the bent portion 31 between the pair of adjacent constituent walls 16, 1.
6 are pressed by the external force F1 in a direction approaching each other.

As a result, stress concentrates on one component wall portion 15, but the boundary between the adjacent component wall portion 14 and the bent portion 15a and the boundary portion between the bent portion 15a and the flat portion 15b are hardly deformed by work hardening. , Fixed plate 26 on flat portion 15b
A force F2 acting in the direction of contact with. At the same time, FIG.
As shown in (1), a reaction force R1 acting to lift the intermediate molded product 14 acts on the bent portion 15a. Friction contact member 27
When the material of the frictional contact member 27c is selected such that the condition that the static friction force F3 between c and the bent portion 31 is larger than the reaction force R1 is maintained, the contact state between the bent portion 15a and the fixed plate 26 is maintained. .

When the pressing punch members 27, 27 are further moved in a direction approaching each other while maintaining this contact state, as shown in FIG.
A pair of component wall portions 16 are raised while slightly shifting b and 27b upward, and the flat portion 15b is deformed in a direction in which a gap with the fixed plate 26 is eliminated, and comes into contact with the fixed plate 26. Fixing plate 2 of this flat portion 15a
6 causes a reaction force R2 on the flat portion 15b. Static friction force F between the friction contact member 27c and the bent portion
If 3 is equal to or greater than the sum of the reaction force R2 and the reaction force R1, the flat portion 15b is further deformed in the direction in which the flat portion 15b contacts the fixed plate 26 while the contact state between the flat portion 15b and the fixed plate 26 is maintained. .

In this figure, the symbol δ1 indicates that if there is no fixed plate 26, the pair of pressing punch members 27 are moved in the direction approaching each other until the joint 5e comes into close contact. When the punch members 27 are moved in the direction of separating from each other, the opening amount based on the springback force of the one component wall portion 15 to return to the original convex curved surface shape, and the symbol δ2 is based on the springback force described later. It is the closing amount.

From the state shown in FIG.
3, the engagement between the tapered portions 27a, 27a of the movable punch members 27, 27 and the tapered portions 29a, 29a of the driving members 29, 29 is released, and as shown in FIG. The movement of the joints 27, 27 is stopped, and the end faces of the joint seam forming wall portions 5a, 5b are brought into close contact with each other to form the upper wall portion 5 on which the joint seam 5e is in close contact. A bottom wall 2 is formed. In the process from the state shown in FIG. 14 to the state shown in FIG. 15, the joint 5e is displaced by an amount corresponding to the closing amount δ2.

Next, when the upper die 23 is raised, the engagement between the driving members 29, 29 and the pressing punch members 27, 27 is released. By this disengagement, the pressure punch member 27,
27 are moved away from each other, and the side wall portions 3 and 4 are moved.
, The external force F2 applied to the bottom wall 2, and the reaction forces R1 and R2 are removed to form the pipe body 1 shown in FIGS. (4) [Explanation of Operation of Pipe Body] FIG. 16 is an explanatory diagram of the operation of the pipe body 1 thus formed. The bottom wall portion 2 of the pipe body 1 shown in FIG. 16A has a springback force f2 that tends to return to the original shape due to the removal of the external force F2 as shown in FIG. As a result, the seam forming wall portions 5a and 5b try to be displaced in a direction away from each other, and the seam 5e attempts to open by the opening amount δ1.

On the other hand, as shown in FIG. 16C, the bottom wall portion 2 generates a springback force r2 for returning to the original shape due to the removal of the reaction force R2. The closing amount δ2 of the joint 5e based on the springback force r2
Is set to be equal to or more than the opening amount δ1 of the joint 5e based on the springback force f2, even if the external force applied to the side walls 3, 4 by the pressing punch members 27, 27 is removed, the close contact state between the joints 5e is maintained. Will be kept.

In this apparatus for manufacturing a pipe body, the frictional contact member 27c is provided on the pressing punch member 27, and the intermediate molded product 1c is provided.
4 during pressurization of the pair of adjacent component walls 16
17 and the fixing plate 24 are kept in contact. However, as shown in FIG. During the pressurization of 16, the contact state between the one component wall 15 and the fixing plate 24 may be maintained. (5) [Other Square Shapes of Pipe Body] In the embodiment of the present invention, a case has been described in which the pipe body 1 whose closed cross-sectional geometric shape is rectangular (square or rectangular) is formed. As shown in FIG. 18, the geometric shape of the closed cross section is a triangle (see FIG. 18A), a pentagon (see FIG. 18B), and a hexagon (see FIG. 18C).
Can be formed. Note that FIG.
8 (b) and 8 (c), reference numeral 5 'indicates the remaining component wall. (6) [Modification of prismatic pipe body] In the embodiment of the present invention, the joint 5e is formed based only on the springback force for returning to the convex curved surface portion.
However, as shown in FIG. 19A, an engagement projection 35 as an engagement portion is formed on the side portions 6b of the metal plate 6 and the engagement recess 36 is formed as shown in FIG. The engaging recess 36 is formed with a triangular biting projection 37 that bites into the engaging projection 35, and the engaging projection 35 is deformed by the biting projection 37 as shown in an enlarged view in FIG. Thus, a configuration may be adopted in which the pair of joint forming walls 5a and 5b are engaged with each other. FIG. 19C shows the pipe body 1 formed in this manner. According to the pipe body 1, a pair of seam forming walls based on a springback force generated when returning to the convex curved surface portion. In addition to ensuring the close contact between the portions 5a and 5b, the pair of joint-forming wall portions 5a and 5
The adhesion of b will be ensured. (7) [Example of Use of Pipe Body] The pipe body 1 is used, for example, as shown in FIGS. 20A and 20B, for a cantilever type frame body 38 as a support means of a fax / copying machine. Can be A mounting frame 39 is attached to the pipe body 1, and a scanner unit (not shown) is mounted on the mounting frame 39, for example.

[0046]

According to the pipe body manufacturing apparatus and the intermediate molded product of the pipe body according to the present invention, a pipe body in which seams are in close contact by press molding during mass production can be stably manufactured without variation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external shape of a pipe body according to the present invention.

FIG. 2 is a side view of the pipe body shown in FIG.

FIG. 3 is a plan view of a metal plate used for forming the pipe body shown in FIGS. 1 and 2;

FIG. 4 is a side view of a primary intermediate molded product according to the present invention.

FIG. 5 is a schematic diagram showing an example of a press device used for press working of a primary intermediate molded product according to the present invention,
(A) shows a state where the metal plate is placed on the movable plate, and (B) shows a state where the metal plate is pressed to produce a primary intermediate molded product.

FIGS. 6A and 6B are side views of the secondary intermediate molded product according to the present invention, wherein FIG. 6A is a view showing the overall shape thereof, and FIG. 6B is a partially enlarged view thereof.

FIG. 7 is a perspective view showing the external shape of a secondary intermediate molded product according to the present invention.

8 is a schematic view showing an example of a press device used for press working of the secondary intermediate molded product shown in FIGS. 6 and 7,
(A) shows a state where the primary intermediate molded article is placed on the movable plate, and (B) shows a state where the primary intermediate molded article is pressed to produce a secondary intermediate molded article.

FIG. 9 is a schematic diagram showing another example of a press device used for press working of the secondary intermediate molded product shown in FIG.

FIG. 10 is an explanatory view in the case where the shape of the closed cross section of the pipe body according to the present invention is rectangular.

11 is a view showing a schematic configuration of a pipe body manufacturing apparatus according to the present invention, and is a view showing a state where the secondary molded article shown in FIG. 6 is set in a processing apparatus main body.

FIG. 12 is a partially enlarged view showing a state where a pressing punch member abuts on a bent portion of the secondary intermediate molded product shown in FIG. 6;

13 is an explanatory diagram of an external force acting on the secondary intermediate molded product shown in FIG.

FIG. 14 is an explanatory view showing a deformed state of the secondary intermediate molded product shown in FIG.

FIG. 15 is a view showing a state in which a pair of pressurizing punch members of the pipe manufacturing apparatus shown in FIG. 11 are movably stopped.

FIG. 16 is an explanatory view for explaining an opening of a joint of a secondary intermediate molded product based on a springback force generated on a pair of side wall portions, where (a) shows a pipe body in a state where the joint is in close contact; (B) is an explanatory view showing a state where the seam is virtually opened based on a springback force f2 for opening the seam applied to the bottom wall, and (c) is a seam applied to the bottom wall. It is explanatory drawing of the closing amount of the joint by the springback force r2 which closes eyes.

FIG. 17 is a view showing a modification of the pipe manufacturing apparatus shown in FIG. 11;

FIG. 18 is an explanatory view for explaining another shape of the pipe body according to the present invention, wherein (A) shows a triangular pipe body, (B) shows a pentagonal pipe body, C)
Indicates a hexagonal pipe body.

FIGS. 19A and 19B are explanatory views for explaining a modified example of the pipe body according to the present invention, wherein FIG. 19A is a plan view of a metal plate used in this modified example, and FIG. FIG. 9C is a perspective view illustrating a state in which the engagement portions are engaged with each other, and FIG.

FIG. 20 shows an example in which the pipe body according to the present invention is used as a support means of a copying machine, (a) is a perspective view of the support means,
(B) is a side view of the supporting means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe body 2, 3, 4 Component wall 5a, 5b Joint component wall 5e Joint 6 Metal plate 14 Intermediate molded product 15 One component wall 15a Bent part 15b Flat part 16 Adjacent component wall 22 Fixed type 24 Fixed Plate 27 Pressing punch member 31 Bend

Claims (11)

[Claims] 1. A rectangular metal plate is used as a raw material, and has a plurality of component walls and joints, and the joints are closely adhered based on a springback force to form a pipe body having a square cross section. A wall having a pair of bent portions formed on both sides of a seam forming wall portion to which the seam belongs and a flat portion by bending a plurality of portions of the metal plate along a direction along the side thereof. Part and a pair of adjacent component wall portions adjacent to the one component wall portion, and the seam is in a non-contact state, and the angle formed by the adjacent component wall portion and the bent portion completes the pipe body. A processing device main body on which an intermediate molded product larger than the angle at the time of setting is set, the processing device main body has a fixed die, and the fixed die is in contact with the pair of bent portions and the flat portion. Leave a gap between A fixing plate on which an article is placed, and a pressing punch member slidably mounted on the fixing plate and pressing the pair of adjacent component walls in a direction approaching each other, Is a reaction force generated when the flat portion is deformed in the direction of contact with the fixed plate due to pressurization of the pair of adjacent component walls, and the one configuration after the flat portion comes into contact with the fixed plate. A contact is made with the bent portion of the joint component wall portion so that the one component wall portion is kept in contact with the fixing plate against a reaction force generated by maintaining the flatness of the wall portion. And a frictional contact member for suppressing the rise of the intermediate molded product due to the pressurization of the pair of adjacent constituent walls is provided. 2. A rectangular metal plate is used as a raw material and has a plurality of component walls and joints, and the joints are tightly adhered based on springback force to form a pipe body having a square cross section. A wall having a pair of bent portions formed on both sides of a seam forming wall portion to which the seam belongs and a flat portion by bending a plurality of portions of the metal plate along a direction along the side thereof. Part and a pair of adjacent component wall portions adjacent to the one component wall portion, and the seam is in a non-contact state, and the angle formed by the adjacent component wall portion and the bent portion completes the pipe body. A processing device main body on which an intermediate molded product larger than the angle at which it is set is set, and the processing device main body has a fixed die, and the fixed die is in contact with the pair of bent portions and the flat portion. With a gap between A fixing plate on which the shaped article is placed, and a pressing punch member slidably mounted on the fixing plate and pressing the pair of adjacent constituent walls in a direction approaching each other; The reaction force generated when the flat portion is deformed in the direction of contact with the fixed plate due to the pressurization of the pair of adjacent component wall portions and the one-sided force after the flat portion comes into contact with the fixed plate. In order to maintain a state of contact of the one component wall portion with the fixing plate against a reaction force generated by maintaining the flatness of the component wall portion, An apparatus for manufacturing a pipe body, comprising: an engaging projection which engages and suppresses elevation of the intermediate molded product due to pressurization of the pair of adjacent constituent walls. 3. The apparatus for manufacturing a pipe body according to claim 1, wherein a shape of the closed cross section of the pipe body is rectangular, and each of the constituent walls of the pipe body defines each side of the rectangle. A bottom wall corresponding to one component wall of the intermediate molded product, a pair of side walls corresponding to a pair of adjacent component walls of the intermediate molded product, and a joint wall of the intermediate molded product And an upper wall portion. 4. The apparatus for manufacturing a pipe body according to claim 1, wherein the processing apparatus main body has a movable mold that is movable to face the fixed mold, and the movable mold has a movable plate. And a drive member provided on the movable plate for moving the pair of pressure punch members in a direction to approach each other. 5. The apparatus for manufacturing a pipe body according to claim 4, wherein the pair of pressurizing punch members stop moving while maintaining a pressing force in a state where the one component wall portion is in contact with the fixed plate. It is characterized by being performed. 6. The pipe manufacturing apparatus according to claim 4, wherein the pair of pressurizing punch members have an engagement tapered portion and are urged in directions away from each other, and the driving member is connected to the engagement member. It has an engagement taper part which engages with a taper part, and the pair of pressure punch members are movable in a direction approaching each other by the engagement taper part and the taper part of the drive member. 7. The apparatus for manufacturing a pipe body according to claim 1, wherein the seam is located at the center of the seam forming wall portion. 8. The pipe manufacturing apparatus according to claim 1, wherein the seam is located between the seam forming wall portion and the adjacent structure wall portion. I do. 9. The apparatus for manufacturing a pipe body according to claim 1, wherein said pipe body has a closed cross-sectional shape of a triangle, a pentagon, or a hexagon. 10. The pipe manufacturing apparatus according to claim 1, wherein the processing of the pipe is performed in anticipation of the amount of extension when the metal plate is bent. 11. A pipe body having a rectangular cross section and having a square cross section, having a plurality of component walls and joints formed by using a rectangular metal plate as a material, and the joints being in close contact with each other by a springback force. And a pair of bent portions formed on both sides of a seam forming wall portion and a flat portion to which the seam belongs by bending a plurality of portions of the metal plate along a direction along the side thereof. And a pair of adjacent component wall portions adjacent to the one component wall portion, and the seam is in a non-contact state, and the angle between the adjacent component wall portion and the bent portion completes the pipe body. An intermediate molded product of a pipe body characterized by being larger than the angle at the time.