JPS59153526A - Monolithic type flanged elbow and its forming method - Google Patents

Abstract

PURPOSE:To form a tilted elbow without welding flanges thereto by holding the inside circumferences of the flange parts formed by forging at both ends of a straight pipe in the mouth cores of sliders, pressing the straight blank pipe part with a punch and bending the same to a prescribed shape. CONSTITUTION:Flanges are formed by forging at both ends of a straight blank pipe, and the flange parts are fitted to the partial annular grooves of both sliders 13. Mouth cores 14 are inserted into the inside circumferences of the flange parts and are positioned by means of nuts 14b. A punch 2 is attached to the bottom surface of a pressing means 1 and a center pin 3b is fitted into both pin holes. When a pressing force is exerted on the means 1 to move downward said means, both main guide levers 6, 7 expand the top end of a slider 10 while moving slightly the same up into a guide 9. Auxiliary guide levers 11, 12 are guided by sloped grooves 4b, 5b so as to incline outward, and both die guides 4, 5 are turned around the center pins 4b', 5b' to expand the bottom ends thereof, by which the straight pipe is formed into an elbow.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-piece flanged elbow and a method of forming the same.

Conventional flanged elbows are generally manufactured by forming a straight pipe into an elbow by bending and welding flanges to both ends.

However, with such a flanged elbow, it is impossible to perform ultrasonic flaw detection on the welded portion of the flange to the elbow, resulting in a lack of reliability. Recent nuclear power generation equipment and the like require a high degree of reliability, and of course the piping used therein also requires a high degree of reliability.

The present invention was developed in view of the above circumstances, and its purpose is to provide an integral flanged elbow and a method for molding the same.

An integral flanged elbow and a method for molding the same according to the present invention will be explained based on the drawings.

FIG. 1 shows an integrated flanged elbow 100 as a product. The integrated flanged elbow 100 has flanges formed by forging on both ends of a straight pipe, and both flanges 100'a, 1
00'b is finished by machining, and the integrated flange is made by bending the raw pipe 100' (see Figure 2) into an elbow using the shaft bending device improved by the present invention. A flanged elbow 100 is manufactured. Note that the flanges 100a and 100b do not necessarily have to have the same shape.

Next, based on FIG. 2 to FIG.
The molding method will be explained.

Reference numeral 1 denotes a pressing tool, such as a ram of a press device (not shown), on which pressing force is applied. An upper die 2 is attached to the lower end surface of the pusher 1. The upper die 2 has a fan shape on both outer surfaces, and the radius of the arc of the fan shape is an integrated flanged elbow (hereinafter referred to as the product) 100.
It is a normal bending die having a radius of curvature approximately equal to the radius of curvature of the product 100, and an inner surface formed into a circular concave curved surface that conforms to the inner outer periphery of the elbow of the product 100. 3 is a center pin attachment/detachment device, and frame 3
A is fixed to the outside of arm 4a by overlapping arms 4a and 5a of a lower die guide, which will be described later. 3b is a center pin, and a threaded rod 3c is provided protruding from the center pin 3b, and is screwed into a female thread 3a' provided in the frame 3a.

Therefore, the threaded rod 3c is rotated and the center pin 3b is screwed out.
By pulling out the pusher 1 through the pin hole 1a of the pusher 1, the pusher 1 becomes free to move up and down. After inserting the integrated flanged straight pipe (hereinafter referred to as straight pipe) 100' in the bent state, the upper mold 2 is attached, or after the upper mold 2 is removed, the product 100 is taken out.

4.5 is a lower mold guide, and its arm is 4m long.

5a is the bushing 3 attached to the center pin 3b in the installed state.
It is pivotably supported via b'.

One end of the main guide lever 6.7 is pivotally supported by pins 4a' and 5a' fixed to the outside of the lower end of the rain type guides 4 and 5, and the other end of the main guide lever 6.7 is
The shafts 10a of the subvesicles 1o, which are guided up and down by guides 9 fixed to the base plate 8, are overlapped with each other, and one end is supported by a pair of pins 11a and 12a, each of which is provided on the base plate 8 side. Pins 4b' have the other ends of the pair of left and right sub-guide levers 11 and 12 fixed to the outer ends of the inclined grooves 4b and 5b.

5b' with a loose fit. The shaft bending device is constructed in this way.

A slider 13 is a lower mold placed on the floor surface 4c of the lower mold guide 4. The lower part of the slider 13 forms both side walls 13a, 13a that slide in contact with the inner side surface of the arm 4a of the lower mold guide, and a bottom surface 13b that slides in contact with the floor surface 4c of the lower mold kite,
A cylindrical portion 13c is formed in the center, and the inner diameter corresponds to the inner diameter of the straight pipe 100' and the outer diameter corresponds to the outer diameter of the flange portion 100'a. A partial annular groove 13d is provided on one side of the cylindrical part 13c to fit and accommodate the lower half of the flange part 100', a of the straight pipe, and is connected to this to accommodate the straight pipe i.
An arc-shaped tube receiving groove 13e having a cross-sectional inner diameter corresponding to the outer diameter of o' is provided. A bridge 13f having a through hole in the center is provided at the other end of the cylindrical portion 13c, and the inner circumferences of the cylindrical portions 1 and 3c are connected to an arcuate groove 13g having the same diameter. Reference numeral 14 is a mouth core that can be fitted to the inner periphery of the straight pipe 100'.
The position can be determined at b. Note that the slider 3 is similarly placed on the lower mold guide 5. The bending slider 13 is placed on the rain type guides 4 and 5 to constitute an integrated flanged elbow forming apparatus. In addition, at the time of elbow forming, a bending core (not shown) which is normally used is inserted into the upper mold 2 at a corresponding position into the straight pipe i o o' in advance.

Next, the molding method will be explained in order.

Both threaded rods 3c, 3c are rotated, both center pins 3b, 3b are disengaged from the pin hole 1a of the pusher, and the pusher 1 is slightly raised to remove the flange portion 100' of the straight pipe.
a, 100'b are the partial annular grooves 13d, 13 of both sliders.
d and connect the straight cable pipe 100' to both sliders 13.13.
the flange portion 100'a of the straight pipe 100',
Each mouth core 14.14 is inserted into the inner periphery of 100'b and positioned using nuts 14b, 14b.

Next, the upper die 2 is attached to the lower surface of the pusher 1. Lower the push tool 1 and insert both center pins 3b and 3 into both pin holes 1a and la.
Fit b. Next, when a pressing force such as a ram of a press device (not shown) is applied to the push tool 1, as the push tool 1 descends, the amphibious force slightly raises the idle lever 6. The two pairs of sub-guide levers 11.11, 12.12 have inclined grooves 4b, 4b, 5b corresponding to their respective heads.

Guided by 5b, it tilts outward, and the rain type guide 4.5
The two center pins 3b and 3b are rotated around the circumference υ to expand their lower end portions.1 straight pipe 100' is the flange portion 100' of the straight pipe 100'.
a and 100'b are held by respective sliders 13 and formed into elbows. At that time, the flange part 1 of the straight pipe
00'a.

Both sliders 13.1 fit into the lower part of t o o' b
3 is pulled inward as the straight pipe 100' curves and slides on the lower mold guide 4.5, and the flange part 100'
A and 100'b are kept in their original shapes, and a partially FF17 elbow with a flange 100 is formed.

After the molding is completed, the pressing force of the press device (not shown) is released, the center pins 3b and 3b are disengaged from the push tool 1, the push tool 1 is raised, the upper mold 2 is removed, and the center of both mouths is removed. Child 14.1
4 is separated from the product 100 and the product 100 is taken out,
Furthermore, a bending core (not shown) is removed to obtain a partially flanged elbow.

The partially flanged elbow according to the present invention includes a push tool having an upper mold attached to the lower end surface, one end of which is pivotably supported by the push tool, and a pressing force is applied to the push tool. A slider having a partial annular groove and a mouth core in each of the lower guides is slidable on a shaft object bending device equipped with a pair of lower die guides linked to a base so as to expand the other end. A part-type flanged straight tube with flanges formed by forging on both ends, with a bending core inserted in advance,
Fit each flange into the partial annular groove of each slider, fit the mouth core into the inner periphery of each flange, and attach it to the shaft bending device. Apply pressing force to the push tool to create a straight piece with a partial flange. A partially flanged elbow is formed by bending the pipe. Therefore, a highly reliable partially flanged elbow can be formed without welding a flange to the elbow, and is suitable for JtF child power generation. We were able to provide an elbow joint for piping that meets the demands for high reliability in equipment, etc.

[Brief Description of the Drawings] Fig. 1 is a diagram of a part-type flanged elbow according to the present invention, and Fig. 2 shows a part-type flanged straight pipe in a part-type flanged elbow forming device according to the present invention. A sectional view showing the installed state,
Fig. 3 is a partially cross-sectional side opening of the device, Fig. 4 is a cross-sectional view showing the bezel, Fig. 5 is a cross-sectional view showing a half state after forming a part-type flanged elbow, and Fig. 6 is FIG. 3 is a perspective view of a slider. 1: Push tool, 1a: Pin hole, 2: - Upper mold, 3: Center pin attachment/detaching device, 3b: Center bin, 4° 5: Lower mold guide, 4a, 5a: Lower mold guide arm, 4b, sb: Incline Groove, 4C: Floor surface of lower die guide, 6, 7: Main guide lever,
8: Foundation, 9 guide, 10: Sliding child, 11, 12:
Sub-guide lever, work 3 varnish writer, 13a: side wall, 13
b Bottom surface of varnish slider, 13c: Cylindrical portion, 13d: Partial annular groove, 13e: Tube receiving groove, 13f nib bridge, 13g=
Arc groove, 14: Mouth core, 14a: Threaded rod, 14b: Nut. Representative Patent Attorney 1) Toshiyuki Figure 1 Figure 2 bb 9 10 10a 4b b Figure 3 Figure 4

Claims (1)

[Claims] 1. An integrally flanged elbow characterized by integrally having flanges formed by forging at both ends of the elbow. 2. A push tool with an upper mold attached to the lower end surface, one end of which is swingably supported by the push tool, and a base plate so as to expand the other end by applying a pressing force to the push tool. A slider having a partial annular groove and a mouth core is slidably mounted on each of the lower guides in a shaft bending device equipped with a pair of link-connected lower guides, and flanges are forged at both ends. A straight pipe with an integral flange, in which a core for bending is inserted in advance, is fitted with each flange into the partial annular groove of each slider, and a mouth core is attached to the inner periphery of each flange. An integrated flanged elbow characterized in that the integrated flanged elbow is formed by fitting the two together, attaching it to a shaft object bending device, applying a pressing force to a pressing tool, and bending the integrated flanged straight pipe. molding method.