JPS6264433A - Manufacturing device for steel pipe joint made of stainless steel - Google Patents

Abstract

PURPOSE:To manufacture easily a joint by providing a split die for forming a tapered surface, also providing a pressure frame member provided with the corresponding tapered surface, and working a reaction force on the joint end part through a fluid cylinder. CONSTITUTION:A split die 3 is formed so as to becomes an annular shape as a whole, and a tapered surface 6 is formed on the outer surface. A pressure frame member 9 is provided so as to contact to the split die 3, and also a fluid cylinder 14 for pressing the frmae member 9 is provided. When a piston rod 17 is made to abut on n end face 18 of the frame member 9, and the cylinder 14 is operated, the cylinder 14 moves to the right, and moves a cylindrical holding member 4 to the right through a connecting member 11. Therefore, the split die 3 is reduced as to its diameter through the tapered surfaces 6, 7, and a joint part 2a is formed. According to this method, a joint can be manufactured easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of Industry] The present invention relates to an apparatus for manufacturing a sealed steel pipe joint that fits and joins stainless steel pipes, secures the joint, and completely prevents leakage of fluid flowing through the pipe.

[Conventional technology and its issues]

Conventional steel pipe fittings for butt-joining stainless steel pipes (hereinafter, stainless steel pipe fittings are referred to as pipe fittings) are those formed by welding both jointed pipe ends, and those that are formed by welding both jointed pipe ends, and those with flange collars at each end of both jointed pipes. Attachment is to fit the bold hole provided in the flange collar and screw the bolt and nut together.A joint is formed separately in advance, and both pipes are fitted with a small allowable gap, joined within the joint, and the joint and pipe are welded. In place of the above-mentioned welding, adhesive is filled into the gap and fixed, and screws are attached to the inside of both ends of the joint pipe, and screws that match the threads are attached to the outside of both ends of the joint pipe, and then bonded. Types that are screwed together and fixed with or without the use of agents have been used. The above method is difficult to apply when the pipes to be joined are deformed due to thermal expansion, the pipe diameter has lost its perfect circular shape, the diameters of the pipes to be joined are different, etc., and the work procedure is cumbersome. Therefore, the workability is not good. In order to solve these problems, the applicant utilized the properties of stainless steel to expand the diameter of one tube end to the required size and shape, reduce the diameter, or deform the other tube as required, and then attach the other tube end to the interior or exterior, and then bond the other tube end. We have investigated methods for fixing and sealing by pressing and tightening with an outer mold of the required shape and dimensions, with or without using a compound. This method can be applied in many cases. To this end, it is an object of the present invention to provide a method for expanding or contracting the diameter of one tube and fitting and joining the other tube end in a good condition, or an apparatus for implementing the method, which can be carried out effectively and easily. is the issue.

[Technical means to solve the problem]

The present invention uses three types of molds to solve the above problems. The diameter of the joint pipe is expanded and deformed over a required long distance (hereinafter referred to as diameter expansion) at one end of the joint pipe as a stray portion with the required dimensions and shape. ■Reducing and deforming one end of the joint pipe into a joint with the required dimensions and shape (hereinafter referred to as diameter reduction). (2) After fitting the pipe joint and making the necessary connections, a press mold is applied from the outside by the required distance between the joints, and pressure molding is performed to complete the fixation for sealing. The above-mentioned joints may be joined using an adhesive or without using an adhesive. The gap between the pipes where the pipes are fitted and joined shall be kept to the minimum dimension possible.

These utilize the hydraulic pressure generated from the hydraulic block device and the operation of one end of a lever attached to the shaft head of the lifting and lowering piston.

[Example 1. ] One embodiment of the present invention will be described based on the drawings. FIG. 1 is a partially enlarged cross-sectional side view of a diameter-reducing barrel mold. Figure @2 is a partially enlarged cross-sectional side view of the outer mold for diameter expansion. FIG. 3 is a partially enlarged cross-sectional side view of a mold for pressing and fixing a pipe joint from the outside. In each of FIGS. 1, 2, and 3, there is no concentric circle t in the front view, and each figure is a cross section taken approximately along the center line.

Figures 4A and 4B are partially enlarged cross-sectional views showing defects that occurred due to full pressure molding of pipe fittings that were fitted and joined using glue. Figure 5A shows other defects that occurred. In the partially enlarged front view showing the enlarged diameter part 3A of the joint pipe and the fitting pipe 13, when the pressure molding die 10 was used to fix the joint pipe 13 in a predetermined manner, the adhesive 14 was unevenly distributed and internal deformation occurred at 18 joint joints and adjacent parts. Indicates that this has occurred.

FIGS. 5B and 5C are partially enlarged cross-sectional side views of another embodiment of a modified pipe joint. WJ6 and FIG. 7 are partially enlarged cross-sectional views of other embodiments related to the modification of the pipe joint. FIG. 8A is a partially enlarged sectional front view of a hydraulic cylinder block device useful for carrying out the present invention. FIG. 8B is an embodiment showing the relationship between the operating lever provided on the operating piston shaft 4 of the cylinder block device, the lever i32 that applies pressure to the mold, and the pins 33 and 35 that rotatably lock the lever to the end of the piston. Enlarged front view. A-A cross section shown in Fig. 9A di1, No. 9B
The figure is an explanatory diagram of pressurization by hydraulic operation in the BB cross section shown in FIG. 2.

FIG. 1 shows an application in which the diameter of a stainless steel pipe 3 is reduced in order to form a joint. The tube end 8 is brought into contact with the inner surface of the second horizontal section 8B of the first mold 11 in order to give the required shape and dimensions (hereinafter, each horizontal horizontal section of the mold is referred to as a surface).
. Next, a second part that slides on the outer peripheral surface of the center part 9 that is fixed and maintained on the frame 30 of the support plate that firmly supports the main body.
The mold 5 is applied along the inner circumferential surface of the sliding surface 5S of the first mold 11 in the direction of the arrow, and the mold surface 5S is pressed toward the center using the illustrated inclination angle θ. The tube end 8 is tightened and the diameter is adapted to the mold surface 8B with the required dimensions and shape, and the tube is molded. The front view of this mold 11 is circular, and the other mold surfaces 8A and 80
), with the required shape and dimensions depending on the purpose. In addition, the mold is divided into at least two parts when viewed from the front, preferably into three to eight parts, and from four parts as in the case of the other embodiments shown in FIG. 9A or FIG. 9B. , further divided into eight parts is suitable. The inclination angle θ is selected and used as required depending on the application.

[Example Z]

In the case of diameter expansion, in Fig. 2, the end 8 of the joint pipe 3 is
The inner surface is brought into contact with the mold surface 8B of No. 2 as shown in the figure. The third mold 5 sliding on the outer periphery 9A of the central cylindrical body 9 that supports the mold fixed to the main body support plate is shown, the second mold 6 and the fourth mold 4 are shown.
Applying hydraulic pressure F in the direction of the arrow shown in the figure, the sliding surfaces 5S and 6 of the mold surface
S, 12s, etc. are moved along the sliding surface provided at an inclination angle θ, and the sliding horizontal surface 9S is moved on the axial surface, the entire circumference of the 8A type surface is pushed up along the inclination, and the tube end 8t - diameter enlargement. do. Type 5
．． 6.12.4 is circular in front view, divided into at least two parts, preferably three to eight parts.

In addition to the above-mentioned mold surface 8B, depending on the application, metal fittings such as 8A, 8C, and 6 are provided, and the tube end is formed as required along with the riser 7. Therefore, the shape and dimensions of the required surface are determined to suit the required molding. After the tube end 8 is formed as required, the push-up die is fixed to a certain support plate to maintain its position, and the sliding surfaces 9S, 5S of the die are fixed.

Pull down 6S and 12S and remove the pipe fitting that maintains the full diameter of the formed pipe. These types are operated using a cylinder block arrangement illustrated in FIGS. 8A and 8B and described below. In addition, each mold is divided into at least two parts, preferably three to eight parts, so that it can be applied to each part of the slope, and the molds are arranged and applied in symmetrical blocks with respect to the imaginary pipe center line. FIG. 9A shows an example of four divisions, and FIG. 9B shows an example of two divisions.

[Example 3. ] Fit the joint pipe 13 into the joint pipe 8, and insert the pipe end face 16 of the pipe 13.
is set at the required location near the curved surface 18 of the joint pipe. If the pipe expands thermally, expands or contracts, or rotates from side to side, it cannot be put to practical use because the joint function is insufficient. The set joint has projections 15, 16, 17 on its inner surface, the cross section of which is illustrated in FIG. Apply pressure to the outer circumferential surface.

The jointed pipe to be pressed is manufactured by fitting the joint 8 and the inner joint pipe 13 and using or not using an adhesive or filler in the gap between the two pipes. Hydraulic pressure is used to apply pressure. When the required molding is performed using this mold 10, Fig. 4A, Fig. 4
As illustrated in Figures B, 5A, 5B, and 5C, pipe joints with molding defects occur. These are paddles that use adhesive entirely, but molding defects also occur when no adhesive is used.

In Figure 3, normally d, : dl-ds, but d
In the case of 1≧d2 or d3≧d, the tightening of the protrusion 16 is almost uniform over the entire portion, but the wall of both tubes at the joint ends of the fitting portion is not affected by the deformation due to the shaping by the protrusions 15 and 16. dl> If C1z≦d3 or d1≦d2<
ds produces good results depending on the application, but
If poor results occur, make dl or ds independent, divide the mold into two, and tighten dl or dl with dz k
It is best to tighten the protrusions later. Furthermore, protrusions 15 and 1
6, for example, the size of tz t or tz significantly contributes to the occurrence of defective protrusions (adhesive maldistribution) 14. The defect shown in FIG. 5A is caused by a large amount of adhesive filling, and when the gap between the joint pipe 3A and the fitting joint pipe 13 is large, the space L between the protrusions 16
If 3 is small, defects 5A and t4A are likely to occur as shown in FIG. 5B, that is, the outer surface appears to be tightened with one protrusion, but the adhesive filler is pressed against it. The dimensions of tz and tz are important for defect prevention. If the space t3 is too thick, defects 5A, 3B, and 14A shown in FIG. 5C, ? Easy to occur. For example, for a tube with an outer diameter of 427 mm and a plate thickness of 1.2 UL, tz
Or, when t4 had 8 gates, there was no buckling defect, but when tz or t4 had 14 gates, no defective sound occurred. If hydraulic pressure is used for tightening, the hydraulic cylinder block device and oil pump system used for the joint pipe can be used.

6 and 7, the rising portion 7A of the joint pipe 3A and the protrusion 6A illustrated in FIG. 6 are all formed, and the space 9A is
As illustrated in the figure, the pipe end 3A shown and explained in Figs. 1 and 2 can be formed according to the application to obtain a joint of the desired shape and size, and this joint pipe 3A can be fitted into a joint pipe. 13 are joined, and using the mold 10, pressure is applied to the gap between the two joined pipes 3A and 13 to fix them, thereby completing a sealed joint.

[Example 4. ] Separate mold 1 for diameter expansion (Fig. 1), divided mold 2 for diameter reduction (Fig. 2) used for pipe joint forming, and press from the outside to press the overlapping part of the joint pipe and fitting pipe, and press the pipe from the outside. Hydraulic pressure is applied to apply pressure uniformly all around the circumference, fix it, and complete the seal. FIG. 8A is a partially enlarged cross-sectional side view of the cylinder block showing the relationship between the cylinder and the piston shaft of the hydraulic cylinder block device.

FIG. 8B shows a cross-sectional side view showing the piston shaft and shaft head.

These are circular in front view.

The cylinder 20 has a cylindrical shape, and has two symmetrical chambers extending from the middle partition wall 27. Each chamber is equipped with a piston shaft 21 common to a piston shaft head 26, and the shaft head 26 is sealed against the cylinder wall with an O-shaped ring made of an organic elastic material.
1ll121 is sealed with ring 28A. Both chambers 22 communicate with each other through oil passages 24B and 24C provided inside the shaft 21, and the pressure oil supplied to the chambers 22 is supplied to the oil supply and discharge device 24A with a check valve.
Send oil using an oil pump.

As the shaft head 26 pushes up the air chamber 23, the exhaust hole 28 opens.
Exhaust from B and 280. The shaft end of the pushed-down shaft 21 is moved to the lever 31A by the pin 35, as shown in FIG. 8B.
and 31B are all rotatably locked around the periphery of the bottle. The lever is connected to the fulcrum pin 33 which maintains a constant position.
It is rotatably supported around the periphery of 3. The cylinder 20 and the lever fulcrum 33 of the shaft 21 maintain their predetermined positions. Axis 2
When 1 is pushed up, the lever 3L is locked by the bottle 35.
A and 31B are fixed fulcrums 33 that push down one end 32 of the lever. One end of the lever 32 has a one-piece body that is divided into at least two parts, preferably not divided, and is used in a combination that provides a pressing force F in the case of pipe joint forming shown in FIGS. 1 and 2. However, when the mold is divided into 2 to 8 pieces,
- The levers 31A and 31B' are supported by the fulcrum 33 so that the pressing force F is applied to each molding block 5 instead of to the ring body.

FIG. 9A shows a cross section taken along the line A--A in FIG. 1, and shows two applied embodiments of the lever end 32 that applies pressing force at the same time. The first example is a ring 32B surrounded by a circle with a broken line.
The lever end 32 is a one-piece body or a regular quadrilateral cross section, and as the shaft 21 is pushed up, the fulcrum pin 33 (ring body)
Pressure is applied by pushing down one end of the lever 32B around the periphery of the lever. Also the second
In this example, the number 32 marked on each block 5, which is obtained by dividing the mold into four parts, is
In C, one end 32 of the lever is deformed into a conical body 32C, and the surface of the conical body presses the surface of the split mold. Boundary 9B of the split mold is Q where the split mold block indicates the minimum molding size.
The dividing boundary 9B indicates the minimum size of the divided block. One end of the lever 32 (Fig. 8B) is a two-part body 32A shown in Fig. 9B.
The core body 32A has a pressing force F during molding.
Shape it so as to give it. Although not shown, in the case of the mold 10 (FIG. 3) for pressing and deforming the fixing pipe joint, hydraulic pressure is applied in the same manner.

〔effect〕

The present invention allows pipe fittings for stainless steel pipes to be made relatively easily by using a hydraulic cylinder block device and a split mold, and expanding the diameter of the pipe fitting for the fitting portion of one joint pipe. At least two tubes each having a diameter reduced in diameter, fitted with the other joint tube, and provided with protrusions having the required height and spacing from the outside to cover the required portion of the thus formed tube stacking section.
Preferably, it is pressed using a divided mold divided into 3 to 8 parts, and the required shapes and dimensions are given to the tube surfaces of both tubes, and the tubes are closely fixed and sealed to complete the sealing.

The device of the present invention has the above-mentioned sealed and fixed steel pipe joint that is simple and has high workability, and can be applied for general purposes. In addition, using hydraulic pressure as a power source, pipe fittings are manufactured from raw steel pipes, fitted and joined, the required shape and dimensions are given to the joint part, and a sealed fixed pipe is completed by externally press-forming, so it is difficult to expand or contract. The same concept can be applied for general purposes even if the shape and dimensions are partially changed to manufacture products that meet usage conditions. It is also easy to apply at piping sites. Therefore, piping on a similar stainless steel pipe is extremely simple, the shape and dimensions can be modified quickly and easily, a very distinctive and good steel pipe joint can be obtained, and the cost is low.

[Brief explanation of drawings]

FIGS. 1 and 2 are partially enlarged cross-sectional side views of the pipe joint molding die of the present invention. FIG. 3 is a partially enlarged cross-sectional side view of a mold for press-fixing the joint. FIGS. 4A and 4B are illustrations of defective joints. FIGS. 5A, 5B, and 5C are illustrations of other defective joints. FIGS. 6 and 7 show another application example. FIGS. 8A and 8B are partially enlarged cross-sectional side views of the hydraulic cylinder block device. Figures 9A and 9B are explanatory diagrams of the end of the molding die for controlling hydraulic sound. 1... Diameter reduction 2... Diameter expansion 3.13...
Joining pipes 3A, 8... Pipe ends, pipe fittings 5, 6.8A, 8B, 8C... Mold surface θ... Taber angle F... Pressing force to apply hydraulic pressure during molding, its direction 9.・
・Mold center 10...Fixing fasteners 15, 16.17...Inside mold (for fixing) protrusions A-A,
B-B...Cross section (shown) 14, 14A...Defect part (adhesive maldistribution part) dl, d2. d3...Dimension between protrusions (diameter direction) t,, d2+ Es, t4...
・Dimensions between protrusions (vertical direction) 6A, 7A, 8A, 9
A...Deformed part 20 of the pipe joint...Cylinder 30 of the cylinder block device...Support plates 31A, 31B...Lever 32...Lever end 33...Lever support fulcrum, bin 35... Locking pin 32B...One end of annular lever (circular, square cross section) 32C
...Conical lever one end 32A...Dividing lever one end 9B...Dividing boundary Patent applicant Nippon Metal Industries Co., Ltd. Agent Patent attorney Nakanishi - Procedural amendment (method) 1965/2/Q Day

Claims (1)

[Claims] 1. In a pipe joint that fits and joins two stainless steel pipes (3 and 13) with the same or different diameters, a molding that is fixed and maintained on a fixed support frame (30). The inclined sliding body (
5) A split mold (11) for attaching the required shape and dimensions to the tube surface for the moving inner circumferential surface of the mold (11), the inner surface of which is provided with a conforming shape and dimension surface, and the outer peripheral surface of the steel pipe end (8) being attached to the conforming shape surface. The other joint is attached to the outside of the steel pipe joint by applying a pressing force by moving the split mold surface so as to reduce the diameter of the shape attached to the inner surface of the split mold (11) by bringing only the length portion into contact with the outer circumferential surface. A manufacturing device for stainless steel pipe fittings, characterized by forming steel pipes into a gap that is the minimum allowable shape and size. 2. The split mold is divided into at least 2 parts, preferably 3 to 8 parts, and the dividing boundary surface is radial from the imaginary center line of the central cylindrical body (9) toward the outer peripheral edge of the mold (11). An apparatus for manufacturing a stainless steel pipe joint according to claim 1. 3 In forming a pipe joint that fits and joins two stainless steel pipes (3 and 13) with the same or different diameters, the central cylindrical body (9) of the mold is fixed and maintained by the fixed support plate frame (30). ) The split molds (6 and 1
2) A matching surface is provided on the outer surface, and a steel pipe end (8) is provided on the matching surface.
) is brought into contact with the outer circumferential surface of the tube end (8) for a required length, and the shapes and dimensions given to the outer surfaces of the split molds (6 and 12) are applied to the outer circumferential surface by moving the split mold surface to the pipe end (8) surface. 8) Stainless steel characterized by being shaped so that the other joined steel pipe can be fitted into a gap formed to the minimum allowable shape and size inside the steel pipe joint formed by applying a pressing force to the circumference of the joint pipe to expand its diameter. Manufacturing equipment for steel pipe fittings. 4. The split mold is divided into at least 2 parts, preferably 3 to 8 parts equally, and the dividing boundary surface is divided radially from the imaginary center line of the central cylindrical body toward the outer peripheral edge of the mold. The apparatus for manufacturing a stainless steel pipe joint according to item 3. 5. Add a required inclination angle to the outer periphery of the central cylindrical body (9) of the mold, which is fixed and maintained on the split support fixed platen frame (30), and move the mold to the required location on the joint pipe along the inclined surface. 4. The apparatus for manufacturing a stainless steel pipe joint according to claim 3, which presses the shape and dimensions given to the mold surface to form a shape into which another joint pipe can be fitted. 6 In forming a steel pipe joint in which two stainless steel pipes (3 and 13) with the same or different diameters are fitted and joined, one end of the joint pipe has the required shape and dimensions, and the end of the other joint pipe is attached to the joint pipe with the required shape and dimensions. The overlapped tube part formed by fitting is sandwiched along the outer circumferential surface, and the overlapped tube part is molded into a ring shape all around with a joint forming mold surface having protrusions (15 and 16) with the required spacing and height on the inner surface. A stainless steel pipe fitting, characterized in that it is a press-forming mold that applies pressure on a surface to tightly fix the joint, and is divided into at least 2 parts in the longitudinal direction, preferably into 3 to 8 equal parts. Manufacturing equipment.