JP3075339B2 - Pipe making equipment - Google Patents

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 a tube making apparatus employing a rollless shoe forming method.

[0002]

2. Description of the Related Art As a pipe forming apparatus for manufacturing pipes, a pipe forming apparatus (FIG. 7) by a roll forming method using a large number of forming rolls is generally used.

However, in a flexible tube (FIG. 8) using a relatively thin material among the components of the muffler, since the tube is made of a thin material, a tube forming apparatus using a rollless shoe forming method. (FIG. 9) can be adopted, and equipment costs can be reduced by adopting a tube forming apparatus by this shoe forming method.

[0004] Fig. 10 shows a specific example of a device which is currently introduced as a device for forming a flexible tube.

In this device, a guide roller which receives and feeds a coil material, and both ends of the plate material from the guide roller are passed through forming holes bent in the same direction to form a symmetrical flower shape. A first shoe and a second shoe that perform stepwise until they approach a pipe shape;
A bending jig that narrows the diameter of a formed material that has passed through the second shoe until it becomes a pipe-shaped formed material whose upper opening is substantially closed by passing the formed material along a conical guide surface (FIG. 1).
1) and a welding box provided with a welding torch for welding a butt portion of a pipe-shaped molded material that has passed through a bending jig.

[0006] In this tube forming apparatus, the number of shoes is reduced in terms of space and cost. When the number of the shoes is reduced, the deformation amount of the molded shape shared by each shoe becomes too large, and the target deformed shape of the formed material cannot be obtained. Therefore, instead of the reduced shoes, immediately before the second shoe. A cotton rope for tightening the molding material is wound around each of the position and the position immediately before the bending jig, and a desired shape is obtained by adjusting the tightening of the two cotton ropes.

[0007]

However, in the above-mentioned conventional pipe making apparatus, the adjustment of the forming amount is performed by the strength of the rope tightening, that is, the rope is tightened by experience and intuition. It takes a long time, and the tube making conditions cannot be set quantitatively.
Even if the conditions are set, there is a problem that there is no reproducibility and stable quality cannot be expected.

Further, as shown in FIG. 11, as the bending jig, a jig having only a conical guide surface formed on the inner surface and having a rough exit diameter is used. Butt shape changes, and there is no reproducibility of welding conditions.

The first problem to be solved by the present invention is that, in a pipe forming apparatus employing a rollless shoe forming method, a reduction in the number of setup steps by eliminating adjustment work by intuition and a yield rate by stabilizing molding quality. Is to achieve the improvement.

A second object is to achieve stable welding by adjusting the condition of the butted portion of the pipe-shaped formed material to be constant, in addition to the first object.

The subject 3 includes the first or the second subject,
An object of the present invention is to improve the strength of a weld.

A fourth object of the present invention is to provide a flexible tube tube which achieves the first to third objects.

[0013]

[Means for Solving the Problems]

(Solution 1) Solution 1 of the above problem 1 (Claim 1)
Is formed into a pipe shape by forming a symmetrical flower shape into a symmetrical flower shape by passing both ends of the plate material from the guide roller through guide holes that receive and send out the coil material. A plurality of shoes to be performed step by step until approaching, and the molding material that has passed through the final shoe among the plurality of shoes is further narrowed down and sent to the conical guide surface, and the upper open portion is formed by passing along the conical guide surface. A pipe forming by shoe forming in which a bending jig for narrowing the diameter until it becomes a substantially closed pipe-shaped molded material, and a welding torch for welding a butt portion of the pipe-shaped molded material passing through the bending jig are sequentially arranged. In the apparatus, a symmetrical component having an upwardly open portion that has passed the final shoe is provided immediately before the bending jig. The sliding operation of a fixed die having a semi-cylindrical guide surface for guiding the lower half of the material, two left and right slide dies slidable in the radial direction toward the center of the pipe and having narrowed guide surfaces, and two left and right slide dies are synchronized. A molding amount final adjusting jig provided with a synchronous mechanism and adjusting operation means for adjusting the press molding amounts of both ends of the symmetrical molding material by synchronous sliding operation is provided.

Therefore, the molding conditions such as the pipe shape, the pipe diameter, the welding part insertion angle, etc. of the pipe-shaped molding material to be supplied to the bending jig are quantitatively set in advance, and the set conditions are set before operating the pipe forming apparatus. When the operation of the adjusting operation means of the molding amount final adjusting jig is performed in accordance with the above, the left and right sides of the symmetrically formed material are radially slid toward the same pipe center by the two right and left slide dies via the synchronization mechanism. , And the presser forming amount is adjusted according to the set conditions.

(Solution 2) Solution 2 of the above problem 2
According to a second aspect of the present invention, in the pipe forming apparatus according to the first aspect, the bending jig is connected to a conical guide surface whose inner diameter is gradually reduced. A jig having a surface is provided.

Therefore, the diameter of the pipe-shaped molding material that has passed through the final shoe and the molding amount final adjustment jig is changed along the conical guide surface until it becomes a pipe-shaped molding material whose upper opening is substantially closed. Is further narrowed down, and further along the straight guide surface, plastic deformation of the narrowed pipe-shaped molding material proceeds, and the shape uniformity at the exit of the bending jig is maintained.

(Solution 3) Solution 3 of the above-mentioned problem 3
(Claim 3) is the pipe forming apparatus according to claim 1 or 2, wherein a pair of squeeze rolls for pressing the pipe-shaped molded material from right and left are provided at a position immediately before the welding torch. .

Therefore, when the pipe-shaped molded material is pressed from the left and right by the pair of squeeze rolls, the butted portion of the pipe-shaped molded material to be welded is pressed, and the butted gap is kept at a constant minute gap.

(Solution 4) Solution 4 of the above-mentioned problem 4
According to a fourth aspect of the present invention, a pipe formed by the pipe forming apparatus according to the first to third aspects is a two-layer pipe made of a thin stainless steel material, and the outer shape of the pipe is formed into a wavy shape by hydraulic bulge forming after the pipe is formed. It is characterized by being a base tube of a flexible tube to be molded.

Since the outer shape of the flexible tube is formed into a wave shape by hydraulic bulge forming, a large internal pressure acts on the pipe during the hydraulic bulge forming, so that the base tube is required to have stable and high welding strength. . On the other hand, by adopting the pipe forming apparatus, it is possible to manufacture a raw pipe having a high yield that meets welding requirements.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 is a tube-forming apparatus corresponding to Solution 1 to Solution 4.

First, the configuration will be described.

FIG. 1 is an overall system diagram showing a tube forming apparatus according to the first embodiment, FIG. 2 is a partial cross-sectional view showing a final adjustment jig and a welding box of a forming amount of the tube forming apparatus according to the first embodiment, and FIG. FIG. 4 is a front view showing a molding amount final adjustment jig of the tube forming apparatus of the first embodiment, FIG. 4 is a perspective view showing a bending jig of the tube forming apparatus of the first embodiment, and FIG. It is sectional drawing which shows the squeeze roll part of a pipe apparatus.

The pipe formed by the pipe forming apparatus of the first embodiment is made of a thin stainless steel material (for example, with a plate pressure of 0.3).
mm), which is a flexible flexible tube whose outer shape is formed into a wavy shape by hydraulic bulge forming after pipe forming. A method of manufacturing a flexible tube by hydraulic bulge molding is described in, for example,
See No. 95927.

1 to 5, reference numeral 1 denotes a guide roller,
2 is the first shoe, 3 is the second shoe, 4 is the non-rotating shoe, 5 is the final adjustment jig for molding amount, 6 is the bending jig,
7 is a welding torch, 8 is a squeeze roll, and 9 is a welding box.

The guide roller 1 is a roller that receives and feeds a coil material wound around an uncoiler (not shown).

The first shoe 2, the second shoe 3, and the detent shoe 4 are formed into symmetrical flower shapes by passing both ends of the plate material from the guide roller 1 through forming holes bent in the same direction. This is a shoe that performs symmetrical forming stepwise until it approaches the shape of a pipe. It should be noted that the left and right shoes 2, 3, and 4 are formed into symmetrical shapes so as to have a shape described above the respective shoes 2, 3 and 4 in FIG. 1.

The molding amount final adjusting jig 5 is disposed immediately before the bending jig 6 and is fixed to a jig frame 50 as shown in FIGS. A fixed die 51 having a semi-cylindrical guide surface 51a for guiding the lower half of the symmetrical formed material having an upper opening portion which has passed through, and narrowing guide surfaces 52a, 53a slidable in the radial direction toward the pipe center O. Left and right 2
The two slide dies 52, 53, the synchronous cam mechanism 54 (synchronous mechanism) for synchronizing the slide operations of the two right and left slide dies 52, 53, and the operation of adjusting the press forming amount at both ends of the left-right symmetric molded material by the synchronous slide operation. Adjustment handle 55 (adjustment operation means). An alloy softer than stainless steel is stretched on the inner surface of a portion of the fixed die 51 and the slide dies 52 and 53 where the molding material is pressed, so as not to damage the material.

The synchronous cam mechanism 54 is provided with left and right jig frames 5.
Slide plate 5 provided to be able to slide up and down on 0
4a and a cam hole 54b formed in the slide plate 54a in a direction perpendicular to the radial direction toward the pipe center O.
A pin 54c fitted into the cam hole 54b;
And a slide shaft 5 on which slide dies 52 and 53 are fixed.
4d.

The adjustment handle 55 has a screw portion 55a screwed to the jig frame 50. The lower end of the screw portion 55a is fixed to the slide plate 54a. 54a slides up and down. Note that a dial gauge 56 is provided to quantitatively determine the amount of pressure applied by the vertical slide of the slide plate 54a.

As shown in FIG. 4, the bending jig 6 has a straight guide surface 6b whose inner diameter is kept substantially the same as the final pipe diameter, continuously with a conical guide surface 6a whose inner diameter gradually decreases. The molding material that has passed through the molding amount final adjustment jig 5 is further narrowed down by the conical guide surface 6a and the straight guide surface 6b to form a pipe-shaped molding material having a stable shape with its upper opening almost closed.

The welding torch 7 includes a bending jig 6
A welding guide jig 10 for pressing the welded portion from above is provided between the bending jig 6 and the welding torch 7 as shown in FIG. A squeeze roll 8 is provided.

The squeeze rolls 8, 8 are a pair of rolls provided to press the pipe-shaped molding material from right and left at a position immediately before the welding torch 7, and as shown in FIG. The mechanisms 11 and 11 are provided so that the roll pressing amount can be adjusted. In addition, a support roll 12 that supports a lower portion of the pipe-shaped formed material is disposed below the squeeze rolls 8,8.

As shown in FIG. 2, the welding box 9 is provided with a bending jig 6, a welding torch 7, a squeeze roll 8, a presser guide jig 10, and a support roll 12.

Next, the operation will be described.

[Piping operation] At the time of pipe making of a flexible tube, first, a coil material wound around an uncoiler (not shown) is received and sent out by a guide roller 1, and is passed through a forming hole of the first shoe 2. Then, both ends of the plate material are slightly bent upward (of FIG. 6), and then the bending degree of both ends is further increased by passing the forming hole of the second shoe 3 (of FIG. 6). Then, by passing the forming hole of the rotation preventing shoe 4, the position of the forming material in the rotating direction is defined and the degree of bending is increased (FIG. 6). That is, left-right symmetric molding is performed in which the shape is gradually formed into a symmetric flower shape until it approaches the pipe shape.

In the next molding amount final adjusting jig 5, the left and right symmetrical molding materials that have passed through the detent shoe 4 are connected to two right and left slide dies 5 via a synchronous cam mechanism 54.
2 and 53 (FIG. 6).

In the next bending jig 6, the molding material that has passed through the molding amount final adjustment jig 5 is further narrowed down by the conical guide surface 6a and the straight guide surface 6b, and the pipe-shaped molding material whose upper opening portion is almost closed. Then, the welded portion in the abutted state is pressed from above by the next presser guide jig 10, and the butted portion of the pipe-shaped formed material that has passed through the bending jig 6 is welded by the next welding torch 7. .

After the above steps, a two-layer tube made of a stainless steel thin material, and a flexible tube tube whose outer shape is formed into a wavy shape by hydraulic bulge forming after pipe forming is manufactured.

This flexible tube is formed into a wavy outer shape by hydraulic bulge forming, and a large internal pressure acts on the pipe during the hydraulic bulge forming. Therefore, the base tube is required to have a stable and high welding strength. You.

On the other hand, by adopting the pipe forming apparatus, it is possible to manufacture a flexible tube base tube having a high yield that meets the welding requirements.

[Final Adjustment of Molding Amount] Important points in thin-walled tube making are as follows. 1. Molding stability This is the condition setting before welding.

On the other hand, in the conventional method of forming a desired shape using a cotton rope, it is difficult to satisfy the above-mentioned requirements, and it is not possible to quantitatively set tube forming conditions. There is no reproducibility and stable quality cannot be expected.

Therefore, as a result of working on improvement with the aim of "improving molding quality" and "improving workability by eliminating adjustment work by intuition", the molding amount final adjustment jig 5 is adopted.

When using the final adjustment jig 5 for molding, first, molding conditions such as a pipe shape, a pipe diameter, and a welding part insertion angle of a pipe-shaped molding material to be supplied to the bending jig 6 are quantitatively set in advance. Keep it.

The adjustment performed before the operation of the tube forming apparatus is performed by adjusting the adjustment handle 55 of the final molding jig 5 according to the set conditions, checking the adjustment amount with the dial gauge 56, and adjusting the set adjustment amount. Rotate until it reaches.

When this handle operation is performed, the two slide dies 52, 53 on the left and right sides through the synchronous cam mechanism 54 slide by the amount of radial sliding toward the same pipe center on both the left and right sides. The setting position is determined.

When the pipe is formed using the final adjustment jig 5 of the molding amount adjusted as described above, both ends of the left-right symmetric molding material fed into the final adjustment jig 6 of the molding amount are formed by two right and left slide dies 52. , 53, and the press forming amount can be obtained according to the set conditions.

That is, by employing the molding amount final adjustment jig 5 instead of the cotton rope, molding conditions and welding conditions can be quantitatively controlled, and molding stability and welding stability can be achieved. become.

[Bending Forming Operation] Although the forming condition and welding condition can be quantitatively controlled by adopting the above-mentioned forming amount final adjusting jig 5, bending is performed after the forming amount final adjusting step in welding. It is important how the butting conditions of the butted portions to be welded in the process are fixed.

On the other hand, the bending jig 6 employed in the present invention has a straight guide surface 6b having an inner diameter which is substantially equal to the final pipe diameter and is continuous with a conical guide surface 6a whose inner diameter gradually decreases. By passing the pipe-shaped molding material that has passed through the molding amount final adjustment jig 5 along the conical guide surface 6a, the diameter of the pipe-shaped molding material is reduced until it becomes a pipe-shaped molding material whose upper opening is almost closed. As the pipe is narrowed down, and further along the straight guide surface 6b, plastic deformation of the narrowed pipe-shaped molding material proceeds, and the shape uniformity at the outlet of the bending jig is maintained.

That is, compared with the conventional bending jig having only the conical guide surface, the presence of the straight guide surface 6b makes it difficult for the welding butt shape to change, and the butt conditions are adjusted to be constant.

[Squeeze Roll Operation] In addition, as the welding conditions, it is required that the butting gap be maintained at a constant minute gap in order to increase the welding strength.

On the other hand, when the pipe-shaped molded material is pressed from the left and right by the pair of squeeze rolls 8 adopted in the present application, the butted portion of the pipe-shaped molded material to be welded is pressed, and the butt gap is reduced. It is kept at a certain minute gap.

The optimum amount of pressurization by the pair of squeeze rolls 8 can be obtained by adjusting the slide mechanisms 11.

Next, the effects will be described.

(1) As a forming amount final adjusting means provided immediately before the bending jig 6, a fixed die 51 and two right and left slides having squeezing guide surfaces 52a and 53a slidable in the radial direction toward the center O of the pipe. The dies 52, 53, a synchronous cam mechanism 54 for synchronizing the sliding operations of the two left and right slide dies 52, 53, and an adjusting handle 55 for adjusting the press forming amounts of both ends of the symmetrically formed material by the synchronous sliding operation. Since the molding amount final adjustment jig 5 provided is employed, it is possible to achieve a reduction in the number of setup steps by eliminating adjustment work by intuition and an improvement in the yield rate by stabilizing the molding quality.

(2) As a bending jig for narrowing the pipe diameter before the welding step, a straight guide surface 6b having an inner diameter substantially coincident with the final pipe diameter is continuously provided on a conical guide surface 6a whose inner diameter is gradually reduced. Since the bending jig 6 is employed, stable welding can be achieved by adjusting the condition of the butted portion of the pipe-shaped molding material to be constant.

(3) Immediately before the welding torch 7, a pair of squeeze rolls 8, 8 for pressing the pipe-shaped molded material from the left and right are employed, so that the strength of the welded portion can be improved.

(4) Since the pipe formed by the pipe forming apparatus is a two-layered pipe made of a thin stainless steel material, the pipe is formed by a hydraulic bulge forming and then a flexible tube raw pipe whose shape is corrugated. It is possible to manufacture a flexible tube tube with a high yield that has a high welding strength that meets the demand.

Incidentally, the results of the effect confirmation test performed by the present inventors are shown below.

Item Rope method Method of the present invention Setup / adjustment time 47.4 minutes 27.9 minutes to 28.4 minutes Yield rate 85.5% 93.7% to 93.9% Roundness 0.7 to 1.7 mm As is clear from the results of 0.3 to 0.5 mm or more, it was possible to significantly reduce the setup / adjustment time of about 20 minutes, improve the yield rate, and improve the roundness.

(Other Embodiments) In the first embodiment, a two-layer tube made of a thin stainless steel material is formed, and a flexible tube is formed by hydraulic bulging after forming the pipe. Although an example of the apparatus has been described, it is needless to say that the apparatus can be used as a pipe forming apparatus for a thin-walled pipe used in another way.

In the first embodiment, the final adjustment jig 5
Although the example in which the motivation cam mechanism 54 is used as the synchronization mechanism has been described, another mechanism using a link mechanism, a gear mechanism, or the like may be used.

In the first embodiment, the final adjustment jig 5
Although the example in which the adjusting handle 55 is used as the adjusting operation means is shown, a manual operating means other than the handle may be used, or an operating means having an actuator such as a motor or a cylinder may be used.

[0066]

According to the first aspect of the present invention, in a pipe forming apparatus employing a rollless shoe forming method, an upwardly open portion which has passed the final shoe has been provided immediately before a bending jig. Sliding operation of a fixed die with a semi-cylindrical guide surface that guides the lower half of a symmetrical molded material, two left and right slide dies that can slide in the radial direction toward the center of the pipe and a narrowed guide surface, and two left and right slide dies A synchronization mechanism for synchronizing
Since a molding amount final adjustment jig equipped with an adjusting operation means for adjusting the press molding amount of both ends of the symmetrical molding material by synchronous sliding operation is provided, reduction in setup man-hours by eliminating adjustment work by intuition The effect is obtained that the yield rate can be improved by stabilizing the molding quality.

In the invention according to claim 2, claim 1 is
In the pipe forming apparatus described above, since the bending jig is a jig having a straight guide surface having an inner diameter substantially coincident with the final pipe diameter continuously to a conical guide surface whose inner diameter is gradually reduced, the above-described effect is obtained. In addition, stable welding can be achieved by adjusting the condition of the butted portion of the pipe-shaped molding material to be constant.

According to the third aspect of the present invention, there is provided the first aspect.
Alternatively, in the pipe forming apparatus according to claim 2, since a pair of squeeze rolls for pressing the pipe-shaped molded material from the left and right are provided at a position immediately before the welding torch, in addition to the above effects, it is possible to achieve an improvement in the strength of the welded portion. it can.

In the invention according to claim 4, claim 1
The pipe formed by the pipe forming apparatus according to claim 3 is a two-layer pipe made of a thin stainless steel material, and is a flexible flexible pipe whose outer shape is formed into a wavy shape by hydraulic bulging after pipe forming. It is possible to manufacture a flexible tube having a high yield and a high welding strength that meets requirements.

[Brief description of the drawings]

FIG. 1 is an overall system diagram showing a pipe forming apparatus according to a first embodiment.

FIG. 2 is a partial cross-sectional view showing a forming amount final adjustment jig and a welding box of the pipe forming apparatus of the first embodiment.

FIG. 3 is a front view showing a molding amount final adjustment jig of the pipe forming apparatus according to the first embodiment.

FIG. 4 is a perspective view showing a bending jig of the pipe forming apparatus according to the first embodiment.

FIG. 5 is a cross-sectional view illustrating a squeeze roll portion of the pipe forming apparatus according to the first embodiment.

FIG. 6 is a diagram showing a left-right symmetrical molded shape in each step in the pipe forming apparatus of the first embodiment.

FIG. 7 is a perspective view showing a pipe forming apparatus by a roll forming method.

FIG. 8 is a side view showing a flexible tube.

FIG. 9 is a perspective view showing a tube forming apparatus using a shoe forming method.

FIG. 10 is a perspective view showing a conventional flexible tube blank tube forming apparatus using a rope method.

FIG. 11 is a perspective view showing a bending jig used in a conventional pipe forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide roller 2 1st shoe 3 2nd shoe 4 Detent shoe 5 Molding amount final adjustment jig 51a Semi-cylindrical guide surface 51 Fixed dies 52a, 53a Narrowing guide surface 52, 53 Slide die 54 Synchronous cam mechanism (synchronous mechanism) 55 Adjusting handle (adjusting operation means) 6 Bending jig 6a Conical guide surface 6b Straight guide surface 7 Welding torch 8 Squeeze roll

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 37/08

Claims (4)

(57) [Claims] 1. A guide roller (1) for receiving and sending out a coil material; and forming a bilaterally symmetrical flower shape by passing both ends of a plate material from the guide roller (1) through forming holes bent in the same direction. A plurality of shoes (2), (3), and (4) that perform symmetrical molding stepwise until they approach a pipe shape
Out of the plurality of shoes (2), (3), and (4), the molding material that has passed through the final shoe (4) is further narrowed down and sent to the conical guide surface (6a).
a bending jig (6) for narrowing the diameter of the pipe-shaped molding material by elapsing along a) until it becomes a pipe-shaped molding material having a substantially closed upper opening, and a pipe-shaped molding material passing through the bending jig (6). A welding torch (7) for welding a butt portion, and a pipe forming apparatus by shoe forming in which are sequentially arranged. An upper open portion which has passed the final shoe (4) at a position immediately before the bending jig (6). A fixed die (51) having a semi-cylindrical guide surface (51a) for guiding a lower half of a symmetrical formed material having a right-and-left direction, and narrowing guide surfaces (52a) and (53) slidable in the radial direction toward the center of the pipe.
a) two slide dies (52), (5)
3) and two left and right slide dies (52), (53)
A molding mechanism final adjusting jig (5) including a synchronization mechanism (54) for synchronizing the sliding operation of the molding material and adjusting operation means (55) for adjusting the press molding amounts of both ends of the symmetric molding material by the synchronous sliding operation. ) Is provided. 2. The pipe forming apparatus according to claim 1, wherein the bending jig is connected to a conical guide surface having a gradually decreasing inner diameter so as to maintain an inner diameter substantially matching the final pipe diameter. A tube forming apparatus characterized in that the jig has a leaned straight guide surface (6b). 3. A pipe forming apparatus according to claim 1, wherein a pair of squeeze rolls (8), (8) press right and left on the pipe-shaped formed material immediately before the welding torch (7).
A pipe-making apparatus characterized by comprising: 4. A pipe formed by the pipe forming apparatus according to any one of claims 1 to 3, is a two-layer pipe made of a thin stainless steel material, and has a corrugated outer shape formed by hydraulic bulge forming after the pipe is formed. A tube forming apparatus characterized by being a flexible tube base tube.