JPS5994531A - Method and device for producing automatically and continuously elbow - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for automatically and continuously manufacturing a metal tube elbow, and a manufacturing apparatus for carrying out the method.

For a method for manufacturing an elbow mandrel, in which a metal original pipe such as a steel pipe is forced through the F part of the guy of the F rail to the curved part at the tip and expanded, there is a method for manufacturing an elbow mandrel, for example, Patent No. 524554 owned by the applicant of the present application. No. (Special Publication No. 43-6398), a mandrel of an indefinite length was inserted into the curved part of a mandrel installed in a heating furnace through a continuous suppression mechanism from the chi-shaped part. Then, the inventor proposed that the bent pipe extruded from the curved portion be compressed with a die and cut into a predetermined size with a rotary cutter to manufacture an elbow.

However, when adopting such manufacturing technology, complicated and troublesome equipment is required for each part, which not only increases the size of the entire device, but also requires the use of both elbow pipes cut with a cutter. It is necessary to grind the "burrs" of the metal material that occur on the end face, or to prepare a groove for welding. ) (It also has drawbacks such as causing buckling and wrinkling, and there are many problems that need to be solved in terms of mass production and economics.

The present invention is a means to solve the above problems.

In addition to performing some processing on the arbitrary long raw tube itself (this man), we improved the cross-sectional shape of the curved part of the rail and installed a 10-piece shaping die, and created an intermediate mold with an oval cross-section extruded from the curved part. A device with a simple mechanism that straightens the product into a perfect circle using a die, simultaneously cuts and separates the product into predetermined lengths (Ly), and can be used as is without any post-processing, makes it possible to economically produce uniform products. It is intended to be mass-produced.

What is the gist?

V-shaped cutting m cuts were equally cut in the circumferential direction of the outer surface of the tube wall perpendicular to the tube axis at intervals of a predetermined length required for the elbow of the required product, leaving the minimum required thin continuous MW section. Insert any long original tube into the guide section of the mandrel.

While pushing this, the pipe is expanded and bent using a heating device at the curved part of the pipe, and at the same time, it is plastically deformed into an oval cross-section with the long diameter in the transverse direction perpendicular to the pipe axis, and the pipe is stretched to a predetermined length up to the above-mentioned cut. The portion is extruded from the curved portion as an intermediate molded product.

At the same time as this is extruded, the pipe is straightened into a perfect circular cross section using a split shaping die, and most of the connecting wall portion that forms the cut with the succeeding pipe is torn off.

Next, the shaping die is rotated slightly faster than the pushing speed of the original tube to forcibly separate the shot-retaining connection part of the subsequent heave, thereby automatically and continuously producing the desired elbow. It is something to do.

The configuration for carrying out the present invention will be specifically explained below based on the illustrated embodiment.

Reference numeral 1 denotes a mandrel (core metal), which is formed into a curved shape with a required curvature at the tip and gradually expands in diameter toward the tip until it reaches the tip 1a'. It has a curved part upper part a which has an oval cross-section with long diameters in both lateral directions, and a chi F part 1b which has a circular cross-section through which a master tube P, which will be described later, is inserted through the rear part continuous with this. It is configured.

2.2° is a curved part 1a of the mantle, with the rotary drive shaft 4 located concentrically with the curved part 1a of the mantle, and a true diameter that is formed inside with the same radius r as the center of the curved part and equal to the outer diameter of the required elbow. Correction processing to form a semicircular shape s3, 3
A split shaping die in which ° is provided relative to each other,
The nine dies 2, 2, which are disposed on the left and right sides of the drive shaft 4, are moved toward and away from each other through a drive mechanism such as a hydraulic cylinder (not shown), so that they can be rotated about the rotary drive shaft 4 as a fulcrum. It is configured.

Furthermore, complete extrusion of the intermediate molded product described later is detected at predetermined positions at the front and rear ends of the shaping dies 2, 2'.

A detection device using a limit switch, a phototube, etc., for the dies to approach each other and perform a clamping correction action on the molded product @
s, , s2 and/or a dual-purpose detection device S2 that returns after rotation of the die and detects the previous stop is provided, respectively.

5 is a suppression mechanism that continuously pushes the original tube over the mandrel 1 while maintaining a constant speed, and 6 is a mechanism that heats the original tube to a temperature at which it can be plastically deformed at the starting point at the beginning of the bend. 7 is a high-frequency heating device, and 7 assists in pushing the master tube,
Mann: ``It's a sword FO-5 that also acts as a support for Rell.

As shown in detail in Fig. 12 and Fig. 13a, the original pipe P is inserted in the circumferential direction of the outer surface of the pipe wall perpendicular to the pipe axis at intervals of a predetermined length L required to manufacture the required elbow E. niV
Cuts d, d, etc. are cut equally by cutting grooves in the shape of a shape. This V-shaped cut is the original tube Pfman of arbitrary length.
Minimum necessary range (degree) that does not pose any problem when inserting into the rail 1 and handling, and allows easy tearing and separation of the II-type meta-ice 22, which will be described in the manufacturing process described later, without any resistance - Thin connecting wall portion e , e... are left and deleted.

In this way, the raw pipe P, which has been cut equally with the cuts d, d, etc. of the V-shaped cutting grooves at intervals of a predetermined length L, is formed by the thin connecting wall parts e, e,... The length λ required to manufacture an elbow forms an integral, continuous structure.

Therefore, they are divided by equal cuts, and for convenience of explanation below, the first is designated as 18th PI, the second as 2nd 8th Pl, the third as 3rd 8th P3, etc. I will call it .

In the figure, what is shown as P1°7 is the 1st 8th Eve P.
i indicates an intermediate molded product having an oval cross section that is bent at the curved portion 1a of the mandrel, and E indicates a product elbow obtained by correcting the intermediate molded product to a perfect circular cross section using shaping dies 2 and 2I.

The present invention comprises a mantle barrel 1 equipped with an original pipe suppression mechanism 5 and a high-frequency heating device 6 configured as described above, and a split molding member that rotates on a concentric circle with the center radius of the curved portion 1a of the mantle barrel. The elbow E for the purpose of the present invention is automatically and continuously manufactured using the master tube P having the above-mentioned configuration for a manufacturing apparatus including the dies 2, 2, and the detection devices s1, s2.

A series of manufacturing steps related to the device of the present invention are described below.
Detail the purpose.

First, as shown in Figure 1, the 1st and 8th Eve 5. No.28 Pl...
・Insert any long original tube P, which is integrally connected by cutting cuts d, d, etc., into the radial part of the mantle 1, and attach the pressing mechanism 5 to the rear end. Set the stomach.

In this case, the split shaping die 2.2° is the mandrel curved part 1.
The straightening grooves 3, 3' are arranged so that they are located on the same radius r as the center of a, and the two ties λ2, 2. It is set up.

Therefore, when the original tube P is strongly pressed by the suppression mechanism 5,
The first eight PI 77' is heated from the outer circumferential surface by the high-frequency heating device 6, and is pushed at a constant speed while resisting the tube expansion resistance and bending tube resistance due to the curved portion 1a, and advances to the tip portion 1a' of the curved portion. As shown in Figure 2, it is formed into a curved pipe conforming to the curved portion 1a. Since the pressing mechanism 5 operates continuously at a constant speed, the first high gear P is pushed forward by this mechanism.
Then, as an intermediate molded product Pl', it is plastically deformed and extruded into a curved tube having an oval cross section equal to the curved portion tip 1a'.

And a split shaping die 2 is placed in front of the curved part.
, 2 degrees and reached the center radius of the curved part 3, 3 degrees, and the tip of the intermediate molded product PI' was placed at a predetermined position at the front end of the shaping die. Contact device S.

When the intermediate molded product p, + comes into contact with the detection device S1, the cut d made by the connecting wall e between the molded product (first 8th part) and the subsequent 21st part P2 is at the tip 1a' of the mandrel curved part. The detection device S2 disposed at the rear end of the tie simultaneously confirms the reached position. (
(See Figure 3) In this way, when it is confirmed that the intermediate molded product P1 has been completely extruded by the first eight actuators, the split shaping tie that has received the detection signal 2,
2' immediately starts operating by the drive mechanism (see Figures 6 and 8), and compresses the intermediate molded product in the radial direction from both sides of its long axis by relative pressure, and corrects the cross-sectional shape to a perfect circle. do. (Figure 9) Generally, it is well known that when a master pipe is bent into a curved shape, a compressive force is applied to the inside of the bend, while a tensile load is applied to the outside of the bend, which causes a difference in the plastic state of the master pipe. be.

Therefore, the 1st case of the present invention is the 1st 8th case in the original tube.

The cuts d, d... by V-shaped cutting grooves for forming the second pipe... are cut, and the thin connecting wall parts e, e...
Therefore, at the time when the intermediate molded product Pl' is extruded, the connection part with the second eighth life P2 is on the outside of one bend, and the initial cutting groove angle θ is forced. As shown in the enlarged view of Fig. 13b, the tensile load causes the expansion to a wide angle θl, and as a result, as is clear from the same figure and the previous Fig. Modeka naturally became a request torn apart.

On the other hand, on the inside of the second bend, the connecting walls are connected due to compression, but the angle θ becomes a narrow angle θ2 as shown in Fig. 130, and this causes the movement (flow) of the original tube phase material.
This will help absorb the

Therefore, as described above, in order to correct the cross-sectional shape of the intermediate molded product Pi 7 having an oval cross-section extruded from the mandrel curved portion into a desired perfect circle by the pressing action of the die, The major axis X in the explanatory diagram of the figure,
In order to correct the oval cross-section with the minor axis y into a perfect circle with the diameter W, the subsequent A-vee P2. ! :The connection is only at the four diagonal corners where both pipes E and P2 of irregular cross section intersect.
, e' . . . remain, and all other connecting wall portions e are torn and separated by shearing force.

In other words, the intermediate molded product p11 having an oval cross section by the first nozzle extruded from the mantle curved portion 1a
a split shaping die 2, which is activated by a signal from a detection device;
At the same time, the piece is compressed by 2゛ and straightened into a perfect circular shape that conforms to the straightening grooves 3 and 31 of the die.
Since most of the connecting wall e with the subsequent second pipe P2 is automatically torn off by shearing force, it is only connected by the intersecting retaining connecting parts e, el, etc. at only four locations. It becomes something that does not exist.

Therefore, with the intermediate molded product being compressed by the shaping dies 2 and 2, the tie λ is rotated counterclockwise in the figure by 40 revolutions of the drive shaft while maintaining a speed slightly faster than the pushing speed of the original tube. , rotates with a curvature of radius r, and due to this difference in speed, the intermediate molded product P1°, which is compressed by the die, forcibly connects the connecting portions e l , e I , etc. of the second pipe P. Cut apart and separate easily.

Product elbow E is taken out by opening the die. (
(See FIGS. 4 and 7) When the product is taken out in this manner, the die immediately returns to its previous position, and the process described above is continuously repeated as one cycle. The return of the die (at this time, the position is corrected by the detection device S2 which also serves to detect the extrusion of the intermediate molded product, and the automatic interconnection mechanism of each part allows this device to operate continuously and accurately, so the product is It becomes uniform and mass production becomes possible.

In addition, the product has V-shaped cutting grooves in the base tube, which absorb and assist material movement on the inside of the bend, where the compressive force is 11 times higher than the tensile load on the outside of the bend, as described above. Therefore, the straightening fP of the shaping tie λ will never cause distortion or buckling, and therefore there is no risk of causing wrinkles on the product surface. There is no burr on the metal material at the end of the separated product, as would be the case with cutting with a cutter, so there is no need for grinding, and one side of the V-shaped halves becomes a chi-face, so weld again. There is no need for any post-processing of the product, such as bevel processing.

Combined with the device having a simple mechanism, it has the characteristic of being extremely labor-saving.

According to the experiments of the present inventor.

(i+ Outer diameter of original tube (m) 165.2% (1
11 Pipe wall thickness (n) 8.5% tll11 Depth of cut (V-shaped cutting groove) ni)
7.5%ftvl Cutting angle of cut (θ)
30.0 degrees (V) Thickness of connecting wall (n2)
1.0% tv++ - Length of interval 1st. (A) 6ao, o% When the original tube with the above dimensions is bent into a curved tube with a bending radius of 304.8%, the wall thickness on the outside of the 9th bend is 8.2%. As a result, the thickness of the connecting wall decreased to 0.7%, so if this intermediate molded product was straightened into a perfect circle using a shaping die, the connecting wall would easily tear. After cutting, the four intersecting joints could be separated very easily without any resistance, and the separated surfaces could be welded together as joints without any problem.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention. Figures 1 to 4 are Mann's ``11th example of the original tube pushing on the sill.''
＼Eve is formed into an intermediate molded product by the curved part, and when it is pushed out from the curved part, it is straightened into a perfect circular cross section by a split shaping die. When it goes up, it splits the connecting wall part of the second eight. A schematic cross-sectional view of 19 cycles showing the step-by-step process of cutting and separating to produce the required 9 elbows. 5 to 7 are cross-sectional views showing the relationship between the original tube and the split shaping die when viewed from the front side, corresponding to the process shown in FIG. 2.3.4. FIGS. 8 and 9 are cross-sectional views showing the mode of action of the split shaping die during the same process shown in FIG. Figure 10 (A), (B), (A-A, B- in Figure 1 showing the surface shape of each part of the CX mandrel)
FIG. 6 is an end view of a cut portion taken along lines B and C-C. Figure 11 shows the relationship between the splitting and separation state that occurs at the connecting wall with the succeeding pipe when an intermediate molded product with an oval cross section is straightened into a perfect circular product. Explanatory diagram. FIG. 12 is a partially cutaway side view of the master tube used in the present invention. FIG. 13a is an enlarged sectional view of a cut portion created by a V-shaped cutting groove cut in the circumferential direction of the outer surface of the wall of the original tube. Figures 13b and 13c are enlarged sectional views showing changes in the cut portions on the outside and inside of the bent intermediate molded product. Note codes] 1~man r rail, la~curved part, 1a~tip part, lb-guy r part, 2.2''~split shaping die,
3.3'~Correcting groove, 4~Rotation drive shaft,
5 ~ Pressure 111! Structure, 6 ~ High frequency heating device,
P ~ prototube, pt ~ 1st formula Eve. 22 ~ 2nd ceremony eve, P3 ~ 3rd ceremony,
PI・~Intermediate molded product, a, Cut by V-shaped cutting groove, e-Thin connecting wall, ・e°~Mooring connection, 81.82~Detection device, E-Product I report. Patent Applicant Procedures Amendment (Spontaneous) 1982
May 79th, 2015 Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case 1982 Patent Application No. 2058112, Title of the invention3, Person making the amendment Relationship with the case Patent applicant5, Subject of the amendment The "Claims" column and the "Detailed Description of the Invention" section of the specification. 6. Contents of amendment (1) The scope of claims will be amended as shown in the attached document. (2) 9) in the specification. 1) Correct "V-shaped cutting groove" on page 6, line 11 to "V-shaped cutting groove, etc." 2) Add the word fire between page 10, line 13 and line 18. "In addition, the cutting groove of the cut may be a V-shaped gap." 3) "V-shaped cutting groove" at the end of page 14 may be replaced with "V-shaped or U-shaped cutting groove."
The cutting groove is corrected. 4) Correct "V-shaped cutting groove" in the 5th line of page 18 to "JV-shaped or U-shaped cutting groove." 5) Correct "V-shaped shape" in the 12th line of the same page to "V-shaped, etc. shape". 6) Correct the "V-shape" at the end of the same page to "shape y- of the V-shape, etc." 7) Add the word fire between the 4th and 5th lines of page 19. 7. List of attached documents (1) Document stating the amended scope of claims
1 road side
Paper [Claims as amended] (1) In an automatic continuous manufacturing method of manufacturing an elbow by inserting a master tube into the part of Man Fj Noll and expanding and bending the pipe by the curved part. The kite part of the mandrel is made of a master tube in which V-shaped or other cuts are equally cut in the direction of the outer circumferential surface of the tube wall perpendicular to the tube axis, with thin connecting walls remaining at intervals of a predetermined length required for the required elbow. Let it pass through. While pushing this, the mantle is expanded and bent using a heating device, and at the same time, it is heavily deformed into an oval cross-section with the longer diameter in the transverse direction perpendicular to the tube axis, and it is The length is extruded from the curved part as an intermediate molded product.At the same time as this extrusion, the cross section is straightened to a perfect circle using a split mold shaping die, and the majority of the connecting wall part that forms the cut between the subsequent A parts. Then, by turning the shaping die slightly faster than the pushing distance of the original tube, the i series A (a series of forcibly separating the two shot-retaining joints to obtain the required elbow) is made. A method for automatically and continuously manufacturing elbows, which is characterized by automatically and continuously manufacturing elbows. Insert the original pipe into which V-shaped cuts, etc., with the connecting wall portion remaining, into equal parts, and insert it into the first part of the man's rail, heat it, and then expand and bend the pipe. , an automatic continuous manufacturing device that manufactures an elbow by extruding a predetermined length up to the above-mentioned cut from a curved portion.From a mandrel and a 10% shaping die equipped with a pressing mechanism and a high-frequency heating device for the original tube. The man's rail is formed in a curved shape with a required curvature at the end continuous with the first part of the man (the diameter gradually increases toward the end, and the transverse direction perpendicular to the axis as it reaches the end). The split shaping die is supported by a rotary drive shaft located concentrically with the curved portion of the mandrel.The split shaping die is formed inside with a curvature having the same radius as the center of the curved portion of the mandrel. In addition, when the intermediate molded product extruded from the curved part of the mandrel is straightened, a semicircular shape (such as a straightening groove) that forms a perfect circle equal to the outer diameter of the required elbow is provided. An automatic continuous elbow manufacturing apparatus characterized in that the molded product is simultaneously compressed and rotated slightly faster than the pushing speed of the original tube.

Claims (2)

[Claims] (1) In an automatic continuous manufacturing method in which an elbow is manufactured by inserting a master tube into the girder section of a mandrel and expanding and bending the tube at the curved section. The original tube is made by cutting equally V-shaped cuts in the circumferential direction of the outer surface of the tube wall perpendicular to the tube axis at a predetermined length required for the required elbow, leaving a thin connecting wall portion in the circumferential direction. Let it pass through. While pushing this, the tube is expanded and bent through a heating device at the pre-curved part of the mand curve, and at the same time, it is plastically deformed into an oval cross-section with the longer diameter in the transverse direction perpendicular to the tube axis, and the predetermined length to the above-mentioned cut is made. The part is extruded from the curved part as an intermediate molded product. At the same time as this is extruded, the pipe is straightened into a perfect circular cross section using a split shaping die, and most of the connecting wall portion that forms the cut with the succeeding pipe is torn off. Next, the shaping die is rotated slightly faster than the pushing speed of the original pipe to forcibly separate the firing joint of the succeeding pipe to obtain the required elbow. This is an automatic continuous manufacturing method for elbows. (2) Manufactur the original pipe by cutting equal V-shaped cuts in the circumferential direction of the outer surface of the pipe wall perpendicular to the pipe axis at intervals of a predetermined length required for the required elbow, with thin connecting walls remaining. ``An automatic continuous manufacturing system that manufactures an elbow by inserting it into the girder R part of the elbow, heating it, expanding and bending the tube through the curved part, and extruding a predetermined length up to the above-mentioned cut from the curved part. The pupil consists of a mandrel equipped with an original tube suppression structure and a high-frequency heating device, and a 10% shaping die. The diameter of the mandrel gradually increases toward the tip, and the cross section has an oval shape in which the longer diameter is in the transverse direction perpendicular to the axis as it reaches the tip.The split shaping die is positioned concentrically with the curved portion of the mandrel. The shaft is supported by a rotary drive shaft, and is provided with a semicircular straightening groove formed inside with a curvature of the same radius as the center of the curved portion and a perfect circle equal to the outer diameter of the required elbow. Further, when the intermediate molded product extruded from the curved part of the mandrel is corrected, the molded product is simultaneously rotated slightly faster than the pushing speed of the original tube while the molded product is being compressed. Automatic continuous manufacturing equipment for elbows.