JPH0242326Y2 - - Google Patents

Description

[Detailed description of the invention] This invention mainly involves bending a metal plate into a circular shape, and then welding the groove to obtain a circular or tapered pipe. This invention relates to a device for shaping into a circular shape.

Conventionally, a device for shaping this type of work in which a workpiece is held and shaped from the outside by a pair of left and right jaw members each having a curved surface equal to the outer shape of a half of the workpiece is disclosed in, for example, Japanese Patent Laid-Open No. 53-34647. seen in However, this method cannot shape workpieces of different sizes because the curved surface is specified.

Therefore, the present invention provides pressing members that press the workpiece separately from the lower side and both sides, and adjusts the positions of these pressing members relative to the workpiece in conjunction with each other, thereby shaping a workpiece of any size into a circular cross-section. The purpose is to obtain a device that can.

In order to achieve such an object, the present invention supplies a workpiece a made of a curved metal plate onto a backing member 1 in a state surrounding the backing member 1, and pushes the workpiece a with a pushing member 2. Hydraulic devices 20 and 2 are installed on a first pressing member 3 that presses the bucking member 1 from above and that allows the workpiece a to face the lower side thereof, and on a second pressing member 4 that faces both sides of the first pressing member 3.
In the case of shaping while pressing with 4, drive source 6
A pair of left and right screw rods 7 that rotate in conjunction with the machine frame 5
The screw rod 7 is supported by the lower half 7 of the screw rod 7.
a has twice the thread pitch of the upper half 7b, and the second pressing member 4 is screwed into the upper half 7b of the screw rod, and the first pressing member 3 is screwed into the lower half 7a. The first pressing member 3 is screwed together, and the first pressing member 3 is
It is composed of a base 3a that is screwed into the screw rod 7, a lever 3b that is pivotally supported on the base 3a, and a pressing body 3c provided at one end of the lever 3b. It is composed of a base 4a that is screwed together and a pressing body 4b that is slidably inserted and supported by the base 4a, and the other end of the link 8 is attached to the pressing body 4b with one end pivotally supported on the base 3a. , a cam 10 having one end pivotally supported on the upper part of the machine frame 5 and a link 9 having the same length as the link 8 and the other end thereof being pivotally supported, and the other end of the lever 3b is provided on the machine frame 5. The pressing body 3c is brought into contact with the
is moved toward the workpiece a according to the shape of the cam surface 10a of the cam 10.

An example of implementing the present invention will be explained with reference to the drawings.

FIG. 1 shows a side view of a curve shaping device equipped with a welding section A above the curve shaping section B.
is equipped with a bucking member 1 having a circular cross section, and a workpiece a curved into a cylindrical or tapered tubular shape by a bending device (not shown) provided on the left side is supplied to the bucking member 1 so as to surround it. Ru.

A guide plate 11 is provided above the center of the bucking member 1 to guide the groove portion b (see FIG. 5) of the workpiece a supplied to the bucking member 1 so that it always faces upward. A pushing member 2 is provided on both sides of the guide plate 11 to press the workpiece a supplied onto the bucking member 1 from above, and furthermore, on the lower side and both sides of the bucking member 1, a first pressing member 3 that presses the workpiece a from below in order to shape the workpiece a;
A second pressing member 4 that presses the workpiece a from both sides is provided.

The bucking member 1 has its front end suspended from the machine frame 5 in a horizontal state through a support plate 26 projecting upward from its upper end, and its rear end is auxiliary supported by a lever 27 with rollers. and horizontally supported on the machine frame 5.

The welding part A is equipped with three carbon dioxide arc type welding torches that move along the bucking member 1, and the torches 15 are screwed into a threaded rod 17 that drives the leftmost torch 15 in the drawing by an electric motor 16. , by rotating the screw rod 17, the other torches 15 are connected to the leftmost torch 15 via a connecting rod 19, so that they move along with the first torch 15.

On both sides of the bucking member 1,
A pair of left and right screw rods 7 that rotate in conjunction with the drive source 6
is supported by the machine frame 5, and the screw rod 7 has a lower half 7a having twice the thread pitch of the upper half 7b, as is clear from FIGS. 2 and 3. The base 4a was screwed onto the upper half 7b, and the base 3a was screwed onto the lower half 7a.

The first pressing member 3 is composed of a base 3a that is screwed into the screw rod 7, a lever 3b that is pivotally supported on the base 3a, and a pressing body 3c that is provided at one end of the lever 3b. The fourth
As shown in the figure, the pressing body 3c was moved toward the workpiece a according to the shape of the cam surface 10a of the cam 10.

Furthermore, the second pressing member 4 has a base portion 4a that is screwed into the screw rod 7, as is clear from FIGS. 2 and 3.
and a pressing body 4b that is slidably inserted into and supported by the base 4a and can move forward and backward with respect to the workpiece a, and the pressing body 4b further has one end attached to the base 3a that constitutes the first pressing member 3. The link 8 that pivotally supports the machine frame 5
The link 8 has one end pivotally supported on the upper part of the link 8, and a link 9 having the same length as the link 8, and the other end thereof is pivotally supported by a shaft 21.

Furthermore, as is clear from FIG. 2, the above-mentioned pushing member 2 is provided with a pushing piece 2b at the inner end of a lever 2a which is pivotally supported on the machine frame 5 by a shaft 2a-1, and has a pushing piece 2b at the outer end thereof.
is connected to a hydraulic device or other operating source 23 for swinging operation, and the pusher piece 2b is used to press the bevel part b of the workpiece a.
Both ends of the backing member 1 are pressed against the backing member 1 side.

As is clear from FIGS. 2 to 4, the lever 3b has an arm 3b-3 extending substantially horizontally from the center of a shaft 3b-1 rotatably supported on the base 3a.
and arms 3b- extending upward from both ends of the shaft 3b-1.
2, one end of the lever 3b, that is, the arm 3b-3
A pressing body 3c is provided at the tip of the lever 3b, and a roller 3d is attached to the other end of the lever 3b, that is, the tip of the arm 3b-2, and the roller 3d brings the arm 3b-2 into contact with the cam surface 10a of the cam 10. I did it like that.

As is clear from FIG. 4, the cam 10 is comprised of a plate cam with one side in the vertical direction serving as a cam surface 10a.

In addition, as shown in FIG. 3, the first and second pressing members 3,
The pressing bodies 3c and 4b provided in the workpiece 4 are provided with a large number of rollers 1 in a groove-shaped frame 13 along the longitudinal direction of the workpiece a.
It was constructed by arranging 4.

In FIGS. 2 and 3, 20 indicates the base 4.
A hydraulic device interposed between a and the pressing body 4b, 2
Reference numeral 4 indicates a hydraulic device interposed between the base 3a and the tip of the pressing body 3c.

The pressing body 4b has a long groove 2 provided on its back surface.
2, a shaft 21 that connects the other ends of the links 8 and 9 to
was inserted so that pressing by the hydraulic device 20 was allowed.

Next, the operation of this device will be explained.

A workpiece a supplied from a bending device (not shown) is guided by a guide plate 11 with its groove portion b, and is supplied onto the backing member 1 with its groove portion b positioned directly above.

At the welding part A, the first pressing member 3 facing the bottom of the bucking member 1 and the second pressing members 4 facing both sides thereof are adjusted in advance to approximately match the workpiece a. The adjustment is performed by rotating the screw rod 7 by a predetermined amount using the drive source 6. That is, when the screw rod 7 is rotated, the first pressing member 3 and the second pressing member 4, which are screwed together with the lower half 7a and the upper half 7b of the screw rod 7, are rotated into the lower half 7a and the upper half 7b. Due to the screw pitch relationship, the first pressing member 3 is the second pressing member 4.
The pressing bodies 4b provided on the second pressing members 4 on both sides move toward or away from each other depending on the change in the distance between the links 8 and 9.
Therefore, the second pressing member 4 can be aligned in conjunction with the alignment of the first pressing member 3.

However, as shown in FIG. 3, the link 9 is
It swings around a point on the machine frame 5, one end of which is pivotally supported. Therefore, the position of the pressing member 4b can be set so that it can take a desired position at two points, the starting point A and the ending point B shown in FIG. Since it moves on an arc-shaped locus centered on the center, the amount of pushing becomes redundant. Therefore, at the intermediate point, the pushing amount by the first pressing member 3 is relatively insufficient compared to that by the second pressing member 4, and therefore, when the workpiece a is supported between them, the workpiece a does not become a perfect circle.

In order to correct this, the pressing body 3c of the first pressing member 3
As shown in FIG.
The roller 3d provided at the tip of the lever 3b and the other end of the lever 3b, that is, the tip of the arm 3b-2, is connected to the cam 10.
The first pressing member 3 is moved forward toward the workpiece a by an amount corresponding to the insufficient pushing amount of the first pressing member 3 described above. To further explain this, the first pressing member 3 is moved from the position of the solid line shown in FIG.
When the lever 3b is moved to a position approaching the cam 10, the other end of the lever 3b, that is, the tip of the arm 3b-2 is pushed by the cam 10,
Along with this, one end of the lever 3b, that is, the arm 3b-
3 rises, and the pressing body 3c can be advanced toward the workpiece a by an amount corresponding to the insufficient pushing amount of the first pressing member 3. Therefore, if the workpiece a is sent between these, the workpiece a will be in a substantially perfect circular state.

Next, after the guide plate 11 is moved upward by the hydraulic device 12, the hydraulic device 20 and the hydraulic device 24 are operated to close the groove portion b. Therefore, if the groove part b is then welded, a pipe will be obtained.

In order to take out the finished tube from the bucking member 1, the roller-equipped lever 27 supporting the rear end of the bucking member 1 is raised as shown by the chain line and then taken out.

In this way, according to the present invention, a pair of left and right screw rods 7 that rotate in conjunction with the drive source 6 are supported by the machine frame 5, and the screw rods 7 have a lower half 7a connected to an upper half 7b. The second pressing member 4 is screwed into the upper half 7b of the screw rod, and the first pressing member 3 is screwed into the lower half 7a of the screw rod, and the first pressing member 3,
It is composed of a base 3a screwed onto the screw rod 7, a lever 3b pivotally supported on the base 3a, and a pressing body 3c provided at one end of the lever 3b. It is composed of a base 4a that is screwed together and a pressing body 4b that is slidably inserted and supported by the base 4a, and the other end of the link 8 is attached to the pressing body 4b with one end pivotally supported on the base 3a. , a cam 10 having one end pivotally supported on the upper part of the machine frame 5 and a link 9 having the same length as the link 8 and the other end thereof being pivotally supported, and the other end of the lever 3b is provided on the machine frame 5. The pressing body 3c is brought into contact with the
Since the cam is moved toward the workpiece a side according to the shape of the cam surface 10a of the cam 10, the difference in the amount of movement between the cam and the pressing body 4b on the second pressing member 4 based on the swinging of the link 9 is Lever 3 that swings in contact with 10
It can be corrected by the swinging of b, and the relative relationship of the movement amount between the pressing body 3c on the first pressing member 3 and the pressing body 4b on the second pressing member 4 can always be made equal, and the distance between them can be made equal. This has the effect of making the workpiece a supplied into a perfect circle.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; FIG. 1 is a side view, FIG. 2 is an enlarged cross-sectional view taken along the line -
FIG. 3 is an enlarged view of a portion of FIG. 1 viewed from the - line, FIG. 4 is a side view thereof, and FIG. 5 is a slope view of the workpiece. DESCRIPTION OF SYMBOLS 1... Bucking member, 2... Pushing member, 3... First pushing member, 3a... Base, 3b... Lever, 3c... Pressing body, 4... Second pressing member, 4a... Base, 4b... Pressing body, 5... Machine frame , 6... Drive source, 7... Screw rod, 7a... Lower half, 7b... Upper half, 8, 9... Link, 10... Cam.

Claims (1)

[Scope of utility model registration request] A workpiece a made of a curved metal plate is supplied onto the backing member 1 in a state surrounding it, and the workpiece a is pressed onto the backing member 1 from above by the pushing member 2. , in which the workpiece a is pressed and shaped by hydraulic devices 20 and 24 provided on the first pressing member 3 facing the lower side and the second pressing member 4 facing both sides thereof, A pair of left and right screw rods 7 that rotate in conjunction with the drive source 6 are supported by the machine frame 5, and the screw rods 7 have a lower half 7a having a thread pitch twice that of the upper half 7b. The second pressing member 4 is screwed into the upper half 7b of the screw rod, and the first pressing member 3 is screwed into the lower half 7a, and the first pressing member 3 is connected to the screw rod 7. The second pressing member 4 is screwed into the screw rod 7, and the second pressing member 4 is screwed into the screw rod 7. The base 4a and the base 4
a and a press body 4b slidably inserted and supported by the press body 4b, and the press body 4b has the other end of a link 8 with one end pivotally supported on the base 3a, and a link 8 on the top of the machine frame 5. The other end of the link 8, which is pivotally supported at one end, and a link 9 of the same length are pivotally supported, and the other end of the lever 3b is brought into contact with a cam 10 provided on the machine frame 5, and the pressing is performed. A metal tube bending and shaping device configured to move a body 3c toward a workpiece a according to the shape of a cam surface 10a of the cam 10.