JP2002361334A - Flange forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange forming machine forming a final rectangular flange in a flared shape by means of one kind of a forming roll. SOLUTION: A pipe fixing base 2 composed of a mandrel T inserted to a pipe P and a chuck 3 firmly holding the outside of the pipe together with the mandrel while remaining a margin of a flange portion is fixed in a bed 1. A dowel 14 is slidably supported along the axial center line of the mandrel from the inside of the margin of the flange portion to the outside of the margin of the flange portion and is also rotatably supported around the axial center line of the mandrel. The end of a shaft 18 of a cone forming roll 17 is supported on the dowel in an oscillation-free state through a plane that passes through the axial centerline of the mandrel. Thus, the cone forming roll provides a means pressing a conical roll 19 to the direction forming the margin of the flange and a means revolving the forming roll around the axial centerline of the mandrel. While a forming process forming the margin of the flange gets to a final forming stage, a control spring 36 always urging the dowel to the mandrel is arranged so that the forming roll can make necessary pressure force for forming the dowel loaded on the margin of the mandrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange forming machine for forming an end of a metal tube into a flange.

[0002]

2. Description of the Related Art Conventionally, as a flange forming machine of this kind,
A first step of fixing the metal pipe to be processed by the chuck and rotating the metal pipe about the axis of the metal pipe, pressing a conical roll against the inner surface of the end of the rotating metal pipe to form the pipe end into a flared shape, and It is known to perform a secondary step of pressing another flared roll against the flared portion to form an intended flange perpendicular to the tube body.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to continuously perform from primary molding to secondary molding with one kind of conical roll.

[0004]

As a means for achieving the above object, the present invention is characterized in that the present invention is characterized in that a mandrel inserted into the inside of a pipe to be machined and the outside of the pipe are gripped together with the mandrel except for a flange margin. A pipe fixing base consisting of a chuck to be fixed to the bed,
One piece is axially movable from the inside of the flange margin to the outside of the flange margin along the axis of the mandrel, and is rotatably supported on the mandrel axis, and the conical roll is rotated on the shaft. One end of the shaft of the forming roll freely fitted is pivotally supported on the top as a fulcrum on a plane passing through the center line of the mandrel, whereby the conical roll is fixed to the flange margin from the inside. At the same time as the abutment, the other end of the shaft is equipped with a means for pressing the flange margin with the conical roll in the direction of forming the flange margin, and a turning means for revolving the forming roll around the core wire axis. During the final forming of the flange allowance, the forming roll is moved axially from the inside of the flange allowance to the outside of the flange allowance while moving the fulcrum (coma) in the axial direction so that the pressing force required for molding can be applied to the flange allowance. The heart Provided always elastically emits control spring to the side, it proposed a flanging machine,

[0005] The invention of claim 2 of the present application provides a bed fixing base comprising a mandrel inserted into the inside of a pipe to be machined and a chuck holding the outside of the pipe together with the mandrel while leaving a flange margin. It is installed so that it can be driven to rotate, and one piece is axially movable from the inside of the flange margin to the outside of the flange margin along the axis of the mandrel, and a conical roll is rotatably fitted on the shaft. A shaft end of a forming roll is pivotally supported on the top as a fulcrum on a plane passing through the center line of the mandrel, thereby abutting the conical roll against the flange margin from the inside, and At the other end, means for pressing the flange margin in the direction of molding the flange margin with the conical roll are provided. During the final molding of the flange margin by the molding roll, the molding roll moves its fulcrum (frame) inside the flange margin. Outside flange fee The pressing force required for molding while axial movement so that it can be loaded on the flange allowance, the piece mandrel is provided with a control spring which emits always elastically to Wa, it proposes a flange forming machine.

According to the first and second aspects of the present invention, the above-mentioned structure in which the one piece is "movably supported in the axial direction" along the axis of the mandrel is constructed by connecting one guide shaft to a mandrel such as a frame. The guide shaft is movably supported in the axial direction along the center axis of the guide shaft, and the top is immovably supported in the guide axis, or the guide shaft is fixed to a frame or the like along the axis of the mandrel, The guide shaft includes a top which is supported so as to be movable in the axial direction.

[0007] "Pressing means" of the forming roll
The term includes what is pressed by means, and what is pressed by a hydraulic cylinder or the like.

Further, as the "turning means" of the forming roll, there are a means for manually turning and a means for transmitting the rotation of the motor via a link. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1, 2, and 3, a pipe fixing stand (2) is fixed on a bed (1), and the fixing stand (2) has a tightening bolt (4).
Chuck base (3) having ... and a metal clamp (5) inside thereof
.., A plurality of clamps (6) on the inside thereof, and a mandrel (7) inserted into the metal tube to be processed, and the outside of the metal tube (P) into which the mandrel (7) is inserted. Then, with the flange allowance (F) to be formed on the flange protruding upward, the clamps (6) are fastened, and the pipe (P) is fixed between the mandrel (7) and the mandrel (7). I have.

An upper plate (11) is provided on one side of the bed (1).
Is provided above the pipe fixing base (2), and a U-shaped arm (8) is protruded. A guide shaft (9) having a head (10) at an upper end is provided on an upper plate (11) of the arm (8). ) Is supported and suspended, and the suspended lower end is connected to the axial center of a cylindrical mandrel (7) having an H-shaped vertical section. (12) is a guide shaft detent pin that stands on the arm upper plate (11) and is engaged with a groove cut into the head (10).

A flange (13) protrudes slightly upward from the bottom plate of the mandrel (7) of the guide shaft (9).
As shown in FIG. 3, a cylindrical piece (1) is provided between the base plate (3) and the mandrel (7), that is, inside the flange margin (F).
4) is rotatably fitted via bearings (15) and (15), and a shaft (18) is mounted on brackets (16) and (16) protruding at positions opposite to the outer surface of the top (14). ), Two small-diameter roller ends of two forming rolls (17) and (17), which are rotatably fitted with a conical roll (19), are supported by fulcrum pins (20) and (20), respectively. , Whereby each forming roll (17), (17) becomes a pin (20),
The guide shaft (9) is supported so that it can swing on a plane passing through the axis of the guide shaft (9) with the fulcrum as a fulcrum.

The pressing means and the turning means of the forming rolls (17), (17) are as follows. Guide shaft (9)
The inner cylinder (21) is slidably fitted on the upper part of the inner cylinder in the axial direction, the pressing arm (22) from one end of the upper end of the inner cylinder (21), and the support plate (23) from the other side at right angles. A motor (24) is installed on the lower surface of the support plate (23), and an outer cylinder (25) is rotatably mounted on the outer periphery of the inner cylinder (21) via a bearing (26). The gear (27) is fitted non-slidably in the axial direction, and the gear (27) is concentrically fixed to the outer periphery of the upper part of the outer cylinder (25), and is fixed to the gear (27) to the output shaft of the motor (24). The pinion (28) is engaged with the outer cylinder (2).
5), and furthermore, brackets (29) and (29) are protruded at positions facing the outer surface of the lower end of the outer cylinder (25), and one end is connected to the bracket by pins (30) and (30). The other ends of the links (31) and (31) are connected with pins (3) at the ends of the large diameter shafts of the forming rolls (17) and (17).
2) and (32). (33) is a pressing grip at the tip of the pressing arm (22).

With the above structure, when the pressing arm (22) is pushed down, the outer cylinder (25) descends along with the inner cylinder (21) along the guide shaft (9), and the lowering of the outer cylinder (25) is linked. (31), forming roll (17) via (31),
(17) is swung downward with the pins (20) and (20) as fulcrums, whereby the flange margin (F) is bent outward by the conical rolls (19) and (19). Also, when the motor (24) is started, its rotation is changed to a small gear (2).
8), transmitted to the outer cylinder (25) via the large gear (27),
The rotation of the outer cylinder (25) causes the forming rolls (17), (17) to revolve around the axis of the guide shaft (9) via the links (31), (31), whereby the conical roll ( The bending of the flange allowance according to (19) and (19) is applied to the entire flange allowance (F), and the flange allowance (F), which was initially cylindrical, is formed into a flared shape, and the molding is advanced to the final flange.

In order to enable the initial flange margin to be formed on the final flange by the forming rolls (17) and (17), the fulcrum pins (20) and (2) of the forming roll are used.
A mechanism is provided to allow the axial movement of 0) and to maintain the pressing force required for forming on the forming roll. First, the upper end of the guide shaft (9) is axially slidably supported on the upper plate (11) of the arm (8), and the lower end of the shaft (9) is located at the center of the bottom plate of the mandrel (7). And a nut (35) for attaching a spring receiving plate (34) to the lowermost end of the penetrating shaft portion. The spring receiving plate (34) and the core plate (7) bottom plate A control coil spring (36) is wound therebetween, and the guide shaft (9), the top (14), and the fulcrum pins (20), (20) of the forming roll are constantly resiliently downwardly sprung by the spring (36). I have.

In this case, the control spring (36) applies the reaction force of the pressing force of the forming rolls (17) and (17) to be applied to the flange margin (F) in the forming to the fulcrum pin (2).
0) and (20), and having such strength that the fulcrum pins (20) and (20) of the forming rolls (17) and (17) can move axially out of the flange margin in the final forming stage. Adjust it to something.

The operation of the above example will now be described. Forming rolls (17) and (17) are applied to the pipe (P) gripped while leaving the flange margin (F) on the pipe fixing stand (2) as shown in FIG.
Are arranged substantially vertically, and in this state, the motor (24) is started to rotate the outer cylinder (25), the links (31), (31), the forming rolls (17), (17) and the top (14). Then, hold the grip (33) and press the arm (2
2) Gradually press down, forming roll (17),
(17) revolves and oscillates downwards to conical roll (1)
9) and (19), the flange margin (F) is formed into a flared shape as shown in FIG. In the meantime, the control coil spring (36) receives the reaction force of the fulcrum pins (20) and (20) of the forming rolls (17) and (17) to guarantee the pressing force on the flange margin (F). When the forming rolls (17) and (17) are further swung downward from the flared forming to the forming of the final flange, the fulcrum pin (2) of the forming roll is rotated.
(0), (20) Accordingly, the top (14) and the guide shaft (9) start moving upward in the axial direction against the coil spring (36), and the fulcrum pin (2) as shown in FIG.
0) and (20) rise outside the flange allowance and are finally formed into a flange perpendicular to the main body.

Another embodiment shown in FIG. 5 is an example in which the pressing means and the turning means are of a manual type. The boss (37a) rotatably fitted on the upper part of the guide shaft (9a) is positioned from the position opposite to the outside of the boss (37a). The arms (38a) and (38a) are projected at right angles, and slide pieces (40a) and (40a) are respectively slid on the dovetail-shaped guide grooves (39a) and (39a) extending in the longitudinal direction provided on the lower surfaces of both arms. It is movably engaged, and forms rollers (17a), (1) on the tops (40a), (40a).
7a), the ends of the shafts (18a) and (18a) are
a) and (41a), and one arm (38
a) is provided with a pressing and turning dual-purpose grip (33a),
Other structures are substantially the same as in FIGS.

According to this embodiment, the forming roll (17a) is held down by the grip (33a) and gradually lowered downward while being reciprocated by 180 degrees around the guide shaft (9a). ) And (17a), a flange margin (F) is formed on the flange.

[0019] In Example 6 according to claim 2, established the turntable (42b) on a bed (1b), to said turntable (42b), the tube fixing table chuck stand (2b) and (3b) bearing (43b), (43b)
And a small gear (46b) fixed to the output shaft of the motor (45b) meshes with a large gear (44b) fixed concentrically to the lower end of the chuck base (3b). , Whereby the rotation of the motor (45b) is transmitted to the tube holder (2), causing the tube (P) fixed thereto to rotate, while the guide shaft (9b) has its upper end at the arm (8b). ) And fixed to the upper plate (11b)
The lower end is mounted on the shaft (47b) of the mandrel (7b).
b) and (47b) are rotatably fitted to each other, and the top (14b) is axially movable via splines (48b)... above the mandrel (7b) of the guide shaft (9b). And the top (1) of the guide shaft (9b).
4b) Spring receiving flange (34) fixed above
b) and the control coil spring (3) between the top (14b).
6b) and only one forming roll (17b) is provided, and a pressing grip (33) is attached to the extension end of the shaft (18b).
Mounting b), the other structure is substantially the same as in FIGS. According to this example, the conical roll (19b) of one forming roll (17b) is pressed against the flange margin (F) of the rotating pipe (P) to form the final flange.

[0020]

According to the flange forming machine of the present invention according to the first and second aspects of the present invention, the flange margin of the metal pipe is formed into a flare shape by one type of forming roll, and then to the flange forming a right angle with the main body. The efficiency of the flange forming operation can be remarkably improved, and the simple forming of a control spring is sufficient in order to realize the continuous forming, so that there is an advantage that it can be provided at a low cost. It is.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of the first embodiment.

FIG. 2 is an enlarged vertical sectional front view of an inner cylinder and an outer cylinder in FIG.

FIG. 3 is an enlarged vertical sectional front view of a frame portion in FIG. 1;

FIGS. 4A, 4B, and 4C are schematic cross-sectional views showing a molding step.

FIG. 5 is a partially omitted longitudinal front view of another embodiment.

FIG. 6 is a vertical sectional front view of the second embodiment.

[Explanation of symbols]

 P Metal tube F Flange allowance 1, 1a, 1b Bed 2, 2a, 2b Pipe fixing stand 3, 3a, 3b Chuck stand 6, 6a, 6b Clamp 7, 7, 7a, 7b Mandrel 14, 14a, 14b Frame 17, 17a , 17b Forming roll 18, 18a, 18b Shaft 19, 19a, 19b Conical roll 36, 36a, 36b Control coil spring

Claims (2)

[Claims] 1. A pipe fixing base comprising a mandrel inserted into the inside of a pipe to be processed and a chuck for holding the outside of the pipe together with the mandrel while leaving a flange margin, is fixed to a bed. Is axially movable from the inside of the flange margin to the outside of the flange margin along the axis of the mandrel, and is rotatably supported on the mandrel axis, and the conical roll is rotatably covered on the shaft. One end of the shaft of the forming roll to be fitted is pivotally supported on the top as a fulcrum on a plane passing through the center line of the mandrel, thereby abutting the conical roll against the flange margin from the inside. , At the other end of the shaft,
Equipped with a means for pressing the flange margin in the direction of molding the flange margin with the conical roll, and a turning means for revolving the molding roll around the center axis of the mandrel.
The forming roll is constantly resilient to the mandrel so that the fulcrum (top) can be axially moved from the inside of the flange margin to the outside of the flange margin while applying a pressing force required for molding to the flange margin. A flange forming machine equipped with a control spring. 2. A bed fixing base comprising a mandrel inserted into the inside of a tube to be machined and a chuck holding the outside of the tube together with the mandrel except for a flange margin is installed on the bed so as to be rotatable. A shaft of a forming roll formed by supporting one piece axially movably from the inside of the flange margin to the outside of the flange margin along the axis of the mandrel, and rotatably fitting a conical roll on the shaft. One end is pivotally supported on the top as a fulcrum on a plane passing through the mandrel axis, thereby abutting the conical roll against the flange margin from the inside, and at the other end of the shaft,
Equipped with means for pressing in the direction of forming the flange margin with the conical roll, during the final forming of the flange margin by the molding roll,
The forming roll is constantly resilient to the mandrel so that the fulcrum (top) can be axially moved from the inside of the flange margin to the outside of the flange margin while applying a pressing force required for molding to the flange margin. A flange forming machine equipped with a control spring.