JP2000246350A - Square pipe core bar pulling out device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a fear of an increase in production cost by pulling out a center core bar by connecting a second connecting means with a first connecting means so that the center core bar is not injured, its durability is improved and, a device is made to be inexpensive with a simple constitution. SOLUTION: A device for pulling out a center core bar 73 from a bent molded square pipe wherein a core bar set made by building up side cores on upper/bottom faces of the center core bar 73 is inserted into a square pipe for performing a bend molding. A core bar pull out device 10 comprises a first connecting means 60 mounted on the center core bar 73, a second connecting means 41 equipped with an open/close claw 50 for engaging with the first connecting means 60, an energization means for energizing the open/ close claw 50 to an engaging side. Also, it comprises a connecting means forward/backward transfer means 40 which forwards the second connecting means 41 towards the first connecting means 60 and retreats the manes 41 after it being connected and, an open/close claw opening means 30 installed for opening the claw 50 during pretreatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing a metal core for a square pipe used for bending.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 57-47530 discloses a method of manufacturing a bent tube for a core used for bending. The method of manufacturing this curved tube is as shown in page 2, upper right column, line 11 to page 2, lower left column, line 19 of the publication.
These are summarized below. (A) A plurality of mild steel plates 1 are stacked to form a core B, and the core B penetrates the straight pipe A. (B) After heating the core metal B together with the straight pipe A, the core metal B is placed on the fixed mold 4 together with the straight pipe A.

(C) The straight tube A is bent into an arc shape by the advancement of the movable mold 5 to form a curved tube A '. (D) Take out the curved tube A ', remove the fixing member 3 and pull out the plate material 1 located at the center to create a gap between the inner periphery of the curved tube A' and the outer plate material 1 (see FIG. 5 of the publication). create. (E) The remaining plate 1 is sequentially pulled out to obtain a curved tube A '. The plate 1 is pulled out by, for example, clamping the plate 1 with a clamp of a piston shaft that is slid by a cylinder.

[0004]

However, in the above method, since the plate (core) is clamped by the clamp, the core is severely damaged. When the core is repeatedly used and the clamp is repeated directly, flaws (flaws) are successively generated in the core due to the force of the clamp. Further, if the pulling by pulling is repeated, the flaw of the metal core becomes large, so that the life of the metal core is shortened and the production cost is increased.

[0005] Further, although the core is pulled out by a cylinder, it is impossible to pull out a bent core by a linearly moving cylinder. That is, it is necessary to turn the cylinder or turn the curved pipe side in accordance with the bending R (R) of the curved pipe. Synchronizing the pivoting and linear movements complicates the equipment and makes the equipment expensive. Furthermore, after bending, the fixing tool is removed, and then the core is pulled out. Therefore, it takes time and effort to remove the fixing tool, resulting in poor workability.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for removing a metal core for a square pipe, which has a simple structure and does not damage the metal core.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a metal core set in which a side metal core made of a resin plate is laminated on upper and lower surfaces of a center metal core made of a resin plate. In the device for removing the center metal core from the square pipe after insertion and bending, the core metal removal device,
A first connector attached to one end of the center metal bar, a second connector provided with an opening / closing claw that meshes with the first connector, an urging means for urging the opening / closing claw toward a meshing side, and a second connector Is reciprocating means for advancing to the first connector and retreating after the connection, and opening / closing claw opening means provided for opening the opening / closing claw during retreat.

[0008] A first connector is attached to one end of the center metal core,
By connecting the second connector to the first connector, damage to one end of the center core is prevented. In addition, an apparatus for removing a metal core for a square pipe is constituted by the first connecting tool, the second connecting tool, the connecting tool reciprocating means, and the opening / closing claw opening means, thereby simplifying the apparatus.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view of a device for removing a metal core for a square pipe according to the present invention.
And a metal core receiver 12 provided at a lower portion of the gantry 11, a control panel 13 for controlling the entire apparatus, an operation panel 14 connected to the control panel 13, and a formed square pipe provided on one of the gantry 11. The square pipe holding means 20 to be placed, the opening / closing claw opening means 30 and the connecting tool reciprocating means 40 attached to the other, the second connecting tool 41 attached to the connecting tool reciprocating means 40, and the second connecting tool 41 The first connector 60 meshes with the first connector 60. Reference numeral 15 denotes a hydraulic unit, and reference numeral 70 denotes a cored bar.

The square pipe holding means 20 includes a first connecting member 60.
A positioning member 21 for positioning the square pipe, a stopper 22 for stopping the end face of the square pipe, a first clamp 23 and a second clamp 24 for holding the square pipe, and a pipe stopping member 25 for stopping the other end of the square pipe. The first clamp 23
A holding plate 26, a support member 27 for swingably supporting the center of the holding plate 26, a hydraulic cylinder 28 fixed to the gantry 11 and connected to the holding plate 26, and an end portion of the holding plate 26. And clamp detecting means 29. The second clamp 24 is the same as the first clamp 23, and the description of the configuration is omitted.

The opening / closing claw opening means 30 has an inclined surface 32 for opening the second connecting member 41. The connecting tool reciprocating means 40 includes a hydraulic cylinder 4 mounted on the gantry 11.
2, a guide part 43 attached to the hydraulic cylinder 42 via the second coupling 41, and a second coupling 4 attached to the gantry 11.
Position detecting means 4 for detecting a forward position and a backward position of No. 1
4, 44 (the retracted position 44 is not shown).

FIG. 2 is a detailed view of a part 2 of FIG. 1, in which the opening / closing claw opening means 30 (see FIG. 1) is omitted. The second connecting tool 41 and the guide portion 43 attached to the rod 45 of the hydraulic cylinder 42 and the pushing member 46 attached below the guide portion 43 are shown. The second connecting tool 41 includes a fulcrum member 47,
A stopper piece 48 attached to an end of the fulcrum member 47;
An opening / closing claw 50 is attached to the fulcrum member 47 so as to be opened and closed. Note that the position detecting means 44 is attached to the retracted position.

FIG. 3 is a sectional view taken along the line 3-3 in FIG. 2. The opening / closing claw 50 includes main bodies 51, 51, a pin 52 for connecting the main bodies 51, 51 to be openable and closable, and the opening / closing claw 50 is engaged with the engaging side. And a spring 53 which is a biasing means for biasing. The main body 51 includes a claw portion 54 formed at one end, a handle 55 formed at the other end, and a fulcrum portion 56 formed at the center.
The spring 53 is arranged so as to push the handles 55, 55, and biases the claws 54, 54 in the closing direction. Note that the pawl portions 54, 54 maintain a predetermined opening dimension H by the stopper pieces 48.

FIG. 4 is a perspective view of a first connecting member of the core removing device according to the present invention. The first connecting member 60 of FIG. 61, a core metal 70 and a square pipe 80 are shown.
The first connecting member 60 includes a guide portion 62, a hook portion 63 formed on the guide portion 62, and a core metal attaching portion 64 provided at one end of the hook portion 63.

The slide member 61 includes a first moving plate 65,
A second moving plate 66 arranged in parallel with the first moving plate 65
And turning plates 67, 67 for slidably supporting the first and second moving plates 65, 66. Swivel plate 67
In the figure, a turning guide surface 68 is formed in an arc shape on the end face, and 69 is an opening.

The core 70 includes side cores 71 and 72 and a center core 73. The side mandrel 71 is on the left side surface 75,
It has a right side surface 76, and the material of the side core 71 is preferably a polyamide resin. The side metal core 72 is
It is the same component as the side metal core 71, and the description is omitted.
These side metal cores 71, 72 are attached to the first and second moving plates 65, 66 of the slide member 61, and the side metal cores 71, 72 are attached.
72 are arranged on both sides of the center metal bar 73.

The center core bar 73 has a backup surface 77,
The center core 73 is preferably made of a polyamide resin. The metal core mounting portion 64 of the first connector 60 is attached to one end of the center metal core 73, and a metal fitting for pulling out is formed on the center metal core 73.

The square pipe 80 is composed of a top plate 81, a bottom plate 82, a left side plate 83, and a right side plate 84, and is a pipe in which the center of the top plate 81 is welded and has an inner bead 86 on an inner surface 85. . Reference numeral 87 denotes a core metal side end, and 88 denotes a molding reference surface. Y1 is the inner diameter, and X is the width dimension.

With respect to the width dimension X, the right side surface 76 of the side core 71 is located at a point P where the radius of curvature r of the corner of the square pipe 80 stops. The same applies to the other corners, and there is no worry that the side surfaces are vacant by the radius of curvature r and are crushed. Side metal core 7
Since the side surfaces 75, 75, 76, 76 of the first and second 72 are aligned with the point P, there is no resistance at the time of insertion, the insertion becomes easier, and the chamfering of the side metal cores 71, 72 according to the curvature radius r is performed. The bending cost of the square pipe 80 can be reduced.

Next, the procedure of bending the square pipe will be described. 5 (a) to 5 (c) are first explanatory views of the procedure for bending a square pipe according to the present invention. (A): First, a raw material is processed into a predetermined length L1 to obtain a square pipe 80. Next, the side metal cores 71 and 72 are inserted from the metal core side end 87 of the square pipe 80 as shown by the arrows. Since the side metal cores 71 and 72 are thinner than the inner diameter Y1 of the square pipe 80 even if two sheets are stacked, the side metal core 71 is
6 (see FIG. 4) and do not touch. As a result, since there is no contact resistance, no special force is required for insertion, and the insertion operation is extremely easy.

(B): The side metal cores 71 and 72 are put in predetermined positions. Then, the center mandrel 73 is aligned with the opening 69 and pushed in the direction of the arrow. It is desirable to apply a lubricant to the backup surfaces 77 and 78 of the center core bar 73 to make it slippery.

(C): While pushing the center core metal 73, the side core metals 71, 72 are expanded by the backup surfaces 77, 78, and the side core metal 71 is sequentially brought into close contact with the inner surface bead 86 (see FIG. 4). . Finally, the first connector 60 is pressed against the turning guide surface 68 of the turning plate 67. By passing the center mandrel 73 through the opening 69, the mandrel 70, which is a mandrel set formed by laminating the side mandrel 71, 72 made of a resin plate on the upper and lower surfaces of the center mandrel 73, is inserted into the square pipe 80. It will be done.

Since both the side core 71 and the center core 73 do not rub against the rough inner surface bead, there is no fear that the side core 71 is scratched or cracked. As a matter of course, the tip of the center core bar 73 does not catch on the inner bead, and there is no trouble in inserting. Also, since the center core 73 slides on the resin, the coefficient of friction is small, and the insertion work becomes easier.

FIGS. 6 (a) and 6 (b) are second explanatory views of the procedure for bending a square pipe according to the present invention. (A): First, the square pipe 80 into which the core metal 70 has been inserted is set in the press machine 100. The press machine 100 includes a mold 10
The mold 101 includes an upper mold 103 having an upper groove 102 formed therein, a central lower mold 105 having lower grooves 104 formed thereon, lower molds 106 and 106 on both sides, and these lower molds 106 and 106. And a receiving stand 110.

The cradle 110 is fitted to a leg 111 so as to be swingable with the leg 111 via shafts 112 and 112.
A swing member 113 for attaching the lower molds 106, 106,
113, a cylinder 114 at the center and cylinders 11 at both ends for appropriately absorbing the pressure of the upper die 103 attached to the leg 111.
5, 115, and a plate member 116 extending over these cylinders 115, 115.

The swinging member 113 is a member having a corner 117 having a predetermined radius of curvature in order to appropriately absorb the pressure of the upper die 103 via the plate member 116. Reference numeral 118 denotes a positioning member attached to the swing member 113. That is,
In order to set the square pipe 80 in the mold 101, the position of the positioning member 118 is adjusted according to the forming reference surface 88 of the square pipe 80. Then, the square pipe 80 is applied to the positioning member 118, and at the same time, the square pipe 80 is fitted to the lower groove 104 of the lower dies 105, 106, and 106, and the setting is completed. C indicates the center line of the square pipe 80.

(B) is an enlarged view of a portion (b) of (a). The center of the first connecting member 60 coincides with the center line C, and at the same time, the vertex of the turning guide surface 68 is also on the center line C. Is shown.

FIGS. 7 (a) and 7 (b) are third explanatory views of the procedure for bending a square pipe according to the present invention. (A): Next, the upper die 103 is lowered, and the square pipe 80 is bent to a predetermined bending radius. Specifically, when an operation button (not shown) is pressed, the upper die 103 is lowered (under predetermined molding conditions).
Then, the square pipe 80 fits into the upper groove 102, and starts bending the central portion while holding the central lower die 105 with the cylinder 114.

The upper die 103 continues to pressurize while holding the square pipe 80 in the upper groove 102 and the lower groove 104 while further applying pressure against the holding force of the cylinder 114. In response to the pressing of the upper die 103, the pivot members 113, 113 rotate and push the plate member 116 downward at the corners 117, 117 as shown by arrows. On the other hand, cylinders 115 and 11
5, a force in the direction opposite to the arrow (upper side in the figure) is exerted through the plate member 116, and the lower dies 106, 106
While appropriately holding the bending. Continue with the upper mold 10
3 rises, and the central lower mold 105 and the lower mold 1
06 and 106 also rise, and the bending is completed.

That is, when the operation button is pressed, the square pipe 8 is pressed.
0 bending, upper die 103, central lower die 105 and lower die 10
6 (the state shown in FIG. 6A) is automatically performed. Thereafter, the bent square pipe 80 is taken out, and the press machine 1
One cycle of bending with 00 is completed. Since the metal core 70 is bent together with the bending of the square pipe 80, no wrinkles are generated in the bending radius portion, and at the same time, there is no fear of being crushed.

FIG. 3B is an enlarged view of a portion b of FIG. 3A.
Is a neutral axis (a part (plate thickness) that does not expand and contract), and a compressive force in the longitudinal direction acts on the side core 71 and a tensile force in the longitudinal direction acts on the side core 72. When a compressive force acts on the side mandrel 71, the side mandrel 71 slides between the center mandrel 73 and releases the compressive force. With this sliding, the first moving plate 65 of the slide member 61 moves in the direction of the arrow. At the same time, when a tensile force acts on the side metal core 72, the side metal core 72 also slides between the center metal core 73 and releases the tensile force, and the second moving plate 66 of the slide member 61 moves in the direction of the arrow. As the first and second moving plates 65 and 66 move in parallel, the turning plate 67 turns by the rotation angle θ as shown by the arrow. Since the swiveling plate 67 is formed with the arc-shaped swiveling guide surface 68, the swiveling plate 67 is connected to the first connecting member 60.
, The first connecting member 60 is not swung by the rotation angle θ. As a result, the guide portion 62 of the first connector 60 is always located on the center line C. Further, the first connecting member 60 does not move in the pull-out direction, and always keeps the insertion position.

Next, the operation of the device for removing a metal core for a square pipe will be described. FIGS. 8A and 8B are operation diagrams of the cored bar removing device according to the present invention. (A) shows the forward movement (outward path) of the second connecting member 41, and (b) shows the backward movement (return path). W is a standby position of the second connector 41, S is an intermediate position of the second connector 41,
Y is the connection start position of the second connector 41, and Z is the second connector 4
1 shows the connection completion position.

3A, the first connecting tool 60 after bending is fitted into the positioning member 21 of the square pipe holding means 20, and the square pipe 80 is fitted into the stopper 22. The first connecting member 60 allows the slide member 61 to be maintained even after bending.
The positioning member 21 always maintains a fixed position.
And it can be easily fitted into the stopper 22. When the clamp button 16 of the operation panel 14 is pressed, the first clamp 2
The third and second clamps 24 press the square pipe 80 by hydraulic pressure (the solenoid valve is excited). At the same time, the ends 27, 27 activate the clamp detecting means 29, 29, and the clamp detecting means 29, 29 output a signal of "clamp completed".

The rod of the hydraulic cylinder 42 moves forward by the "clamp complete" signal (or the solenoid valve is excited by a button operation), and the second connecting member 41 starts moving from the standby position W. When the second connecting tool 41 is separated from the opening / closing claw opening means 30, the opening / closing claw 50 is closed by the spring 53 as shown by the arrow, and passes through the intermediate position S.

When the connecting start position Y is reached, the opening / closing claw 50 comes into contact with the first connecting member 60. The guide portion 62 of the first connector 60 opens the opening / closing claw 50 as shown by the arrow against the spring 53. The second connecting tool 41 further advances and faces the connection completed position Z. At the connection completion position Z, the opening / closing claw 50 is closed by the spring 53, and the claw portion 54 meshes with the hook portion 63. At the same time, the pushing member 46 activates the position detecting means 44, and outputs a signal of "connection completed".

In (b), the rod 45 of the hydraulic cylinder 42 is retracted by the "connection complete" signal,
The center metal 73 is removed from the square pipe 80 after the bending by retracting the center metal 73. When the center core 73 is removed, the opening / closing claw 50 of the second coupling tool 41 is opened and closed.
Contact the inclined surface 32 of Since the inclined surface 32 acts in a direction to open the opening / closing claw 50, the handle 55 is pressed by the inclined surface 32, and the opening / closing claw 50 is opened as shown by an arrow against the spring 53. Almost at the same time, the second connecting tool 41 reaches the standby position W, and the position detecting unit 44 outputs a signal of “completion of extraction”.

The first and second clamps 23 and 24 of the square pipe holding means 20 are driven by the square pipe 80
And the clamp detecting means 29, 29 output a signal of "unclamping", and the removal of the center core 73 is completed. The center metal core 73 is returned to the worker side by the metal core receiver 12. That is, when the clamp button 16 is pressed once, the clamp of the square pipe 80, the removal of the center core 73, and the return to origin (the state of FIG. 1) are automatically performed. Thereafter, the square pipe 80 is taken out, and one cycle of the core metal removing process by the core metal removing device 10 is completed.

When bending the square pipe 80, the slide member 61 absorbs the compression and tension of the side metal cores 71 and 72, and prevents the first connecting member 60 from swinging and moving.
The first connecting member 60 and the square pipe 80 do not interfere with the positioning member 21 and the stopper 22 even if the first connecting tool 60 and the square pipe 80 are set directly from the press to the core metal removing device 10. As a result, the center core bar 73 can be removed simply by replacing the square pipe 80 from the press into the core bar removal device 10, and the center core bar 73 can be easily removed.

Although the opening / closing claw opening means 30 of FIG. 1 shown in the embodiment of the present invention opens the opening / closing claw on the inclined surface 32, the claw portion is extended upward (or downward), and the claw is wedge-shaped. The section may be opened directly. Further, the connecting and reciprocating means 40 of FIG. 1 may be replaced with a rack and pinion mechanism or a screw feed mechanism. Further, the second connector 41 and the first connector 60
It is also possible to replace the connection with the connection by an electromagnet. The structure of the connecting tool can be simplified.

[0040]

According to the present invention, the following effects are exhibited by the above configuration. In the first aspect, the first core attached to one end of the center cored bar.
Since the center metal is pulled out by connecting the second connecting tool to the connecting tool, the center metal is not damaged, and the durability of the metal core is improved. In addition, the core removing device includes a first connecting tool and a second connecting tool.
Since it is composed of the connecting tool, the connecting tool reciprocating means, and the opening and closing claw opening means, the apparatus configuration is simple and the apparatus is inexpensive. As a result, production costs can be reduced.

Furthermore, if the square pipe is bent and formed and then directly set in a core metal removing device, the core metal removing device automatically removes the core metal, so that there is no trouble in removing the core metal.
As a result, the press forming operation and the core metal extracting operation can be performed in parallel, and the operation efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a device for removing a core metal for a square pipe according to the present invention.

FIG. 2 is a detailed view of two parts of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a perspective view of a first connector of the cored device according to the present invention.

FIG. 5 is a first explanatory view of a procedure for bending a square pipe according to the present invention.

FIG. 6 is a second explanatory view of the procedure for bending a square pipe according to the present invention.

FIG. 7 is a third explanatory view of the procedure for bending a square pipe according to the present invention.

FIG. 8 is an operation diagram of the cored bar removing apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Core removal device, 30 ... Opening / closing claw opening means, 40 ... Connecting tool reciprocating moving means, 41 ... Second connecting tool, 42 ... Hydraulic cylinder, 50 ... Opening / closing claw, 53 ... Urging means (spring),
54: claw portion, 60: first coupling tool, 67: revolving plate, 68:
Turning guide surface, 70: core metal, 71, 72: side core metal, 7
3 ... Center metal core, 77 ... Top surface (backup surface), 78
... lower surface (back-up surface), 80 ... square pipe, C ... center line of square pipe.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ito Fujita 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Camron Sinuan 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. F-term (reference) 4E063 AA06 BA03 CA03 HA02 HA05 MA04

Claims (1)

[Claims] 1. A center metal set in which side cores made of a resin plate are laminated on the upper and lower surfaces of a center core made of a resin plate, the center metal is inserted from the square pipe after being inserted into a square pipe and bent. In the removing device, the core removing device includes a first core attached to one end of a center core.
A connecting member, a second connecting member having an opening / closing claw that meshes with the first connecting member, an urging means for urging the opening / closing claw toward the meshing side, and moving the second connecting member toward the first connecting member. An apparatus for removing a metal core for a square pipe, comprising: a connecting tool reciprocating means for moving forward and retreating after connection, and opening and closing claw opening means provided for opening the opening and closing claw during retreat.