KR100302470B1 - A forming method of a pipi jonit and the forming apparatus thereof - Google Patents

Abstract

PURPOSE: A method and an apparatus for forming a pipe fitting are provided which remarkably reduce defective proportion and improve productivity of the pipe fittings during the production of pipe fittings by forming a stainless steel pipe into a pipe fitting through three press processing steps at an ordinary temperature and then forming the pipe fitting through subsequent heat treatment and cutting steps. CONSTITUTION: The method for forming a pipe fitting comprises a first forming step of covering a vinyl paper(110) on the upper part of a stainless steel pipe material(100) inserted into the inner side of a first mold frame(8a) and pressing the upper part of the stainless steel pipe material(100) with a first pressing member(6a) so that the upper part of the stainless steel pipe material(100) is become open to an angle(α) of 20 to 60 degrees; a second forming step of covering a vinyl paper(110) on the upper part of the stainless steel pipe material(100) after inserting the stainless steel pipe material(100) formed in the first forming step into the inner side of a second mold frame(8b), and pressing the upper part of the stainless steel pipe material(100) with a second pressing member(6b) so that the upper part of the stainless steel pipe material(100) is become open to an angle(β) of 80 to 120 degrees, thereby forming a right planar part(122); a third forming step of covering a vinyl paper(110) on the upper part of the stainless steel pipe material(100) after inserting the stainless steel pipe material(100) formed in the second forming step into the inner side of a third mold frame(8c), and pressing the upper part of the stainless steel pipe material(100) with a third pressing member(6c) so that the upper part of the stainless steel pipe material(100) is become open to an angle of 180 degrees, thereby forming a flange part(121); a heat treatment step of heat treating a pipe fitting formed by passing through the first, second and third forming steps at a temperature of 1050 to 1100 deg.C; and a cutting step of completing forming of the pipe fitting by cutting processing the overall surface of the inner and outer parts of the pipe fitting passing through the heat treatment process.

Description

A fitting method of a pipi jonit and the forming apparatus

The present invention relates to a pipe fitting forming method and a pipe fitting forming apparatus used by fixing to the end of the pipe to be connected to the inner side of the flange when the pipe is to be connected during piping, more specifically, the stainless steel pipe at room temperature After forming the flanged pipe fittings (hereinafter referred to as "pipe fittings") by pressing over a number of steps, the pipe fittings are formed through the heat treatment step and the cutting processing step, thereby significantly reducing the defective rate in the production of the pipe fittings. It relates to a pipe fitting molding method and a pipe fitting forming apparatus to improve the productivity of the.

Conventional pipe fittings are manufactured by welding a flange portion and a stainless pipe material, and a hot forming method is used. The welding method is a stainless steel cut into a predetermined length after punching a stainless steel plate to form a flange portion. The flange part is attached to the front end of the tube material to fix the joint by welding, which causes deterioration due to deterioration of the welded part and a problem of fluid leakage and a large amount of manufacturing time in case of poor welding. Had.

In addition, the hot forming method is a portion requiring the formation of the flange portion while rotating in the state of biting the stainless steel tube material 100 to the rotary device 130 as shown in (a), (b) of FIG. Is heated as a heater 131, the stainless steel tube material 100 thus heated is inserted into the mold 132, and then the tip portion is pressed by pressing the tip of the heated stainless steel tube material 100 using the ball pusher 133. After opening the stainless steel tube 100, which is opened at the front end, is inserted into another mold 132, and the bottom surface is pressed into a flat pressing hole to form the pipe fitting 120.

However, these facilities have a problem that the working environment is not only harmed, but also the working environment is harmful by the heater that is complicated and high heat is generated.

The present invention is to solve the conventional problems as described above, by forming a stainless steel pipe fitting by pressing in three stages at room temperature, and then through the heat treatment step and the cutting processing pipe fitting by fitting the pipe fitting It is a technical task to remarkably reduce the defective rate in the production of steel and to improve the productivity of fittings.

In order to solve the technical problem as described above, the method for forming a fitting of the present invention, after inserting a stainless steel pipe material inside the primary mold, and covering the plastic paper on the upper portion of the stainless steel pipe material, Pressing the upper part to open the stainless steel tube material, and inserting the stainless steel tube material first molded into the inside of the secondary mold, and then covering the upper portion of the stainless steel tube material, and the stainless steel as the secondary pressing hole The second forming step of pressing the upper part of the tube material to form a rectangular flat portion, and after inserting the secondary molded stainless steel tube material inside the tertiary mold, cover the plastic paper on the upper portion of the stainless steel tube, the flat bottom 3 As the car pusher, the upper part of the stainless steel pipe material is pressed to 180 ° by pressing the stainless steel material to form a flange portion, and the first, second, and third molding steps are performed. The heat treatment step of heat-treating the fittings at 1050 ~ 1100 ℃, and the cutting process step of completing the processing of the pipe fittings by cutting the entire inner and outer surfaces of the pipe fittings through the heat treatment step.

In addition, the pipe fitting forming apparatus of the present invention, the support is vertically installed in the upper corner portion of the bed and the upper plate of the hydraulic cylinder is fixedly installed on the upper side of the upper support, the lower guide of the lower plate to the lifting guide A hydraulic cylinder for raising and lowering the pressing plate is installed, the pressing plate is installed downward in the pressing plate and the mold is installed on the seating plate is installed on the upper portion of the bed, the seating space in the center space of the mold A support plate is formed in which a lifting hole for taking out a stainless steel tube material is installed, and the support plate and the pressing plate are installed as long bolts. The primary mold is formed of a primary inclined portion inclined upward at an angle of 20 to 60 ° inside the material seating groove, and the primary presser is formed of 1 A flat stepped portion is formed at the front circumference of the primary pressing portion and the primary pressing portion inclined at the same angle as the inclined portion, and the secondary mold is inclined upward at an angle of 80 to 120 ° inside the material seating groove. The inclined portion is formed, and the secondary presser has a second stepped inclination at the same angle as the second inclined portion and the upper and lower end circumferences of the second press portion, respectively, and has a flat stepped portion, and an insertion protrusion is formed at the bottom of the secondary press portion. The tertiary mold has a stepped portion for forming a flange in the inner side of the material seating groove, and the tertiary presser is characterized in that the bottom is formed flat.

Figure 1 (a) (b) is an explanatory view showing a conventional fitting process.

2 (a) (b) (c) is a working state of the present invention.

3 is an explanatory view showing a fitting process of the present invention.

Figure 4 is an installation of the fittings formed by the present invention and the conventional method.

5 is a state of use of the pipe fitting forming apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: bed 2: prop 3: top plate

4: hydraulic cylinder 5: presser plate 6: presser

7: seating table 8: mold 9: support plate

10: long bolt 6a: 1st presser 6b: 2nd pusher

6c: 3rd push 8a: 1st mold 8b: 2nd mold

8c: 3rd mold 61a: 1st presser 61b: 2nd presser

62,63: flat stepped portion 64: insertion protrusion 81a: primary inclined portion

81b: secondary inclined portion 82: stepped portion 83: material seating groove

100: stainless steel tube material 110: plastic paper 120: fittings

121: flange portion 122: perpendicular plane portion 130: a rotating device

131: heater 132: mold 133: ball presser

The present invention for achieving the above object is described in detail with reference to FIGS. 2 to 5 as follows.

Figure 2 (a) (b) (c) is a diagram showing the operating state of the present invention, Figure 3 is an explanatory view showing the fitting process of the present invention, Figure 4 is molded by the present invention and the conventional method Figure 5 shows the installation state of the pipe fittings, Figure 5 shows a state diagram of the use of the pipe fitting forming apparatus according to the present invention.

In the fitting method for forming a fitting according to the present invention, the primary pressing hole 6a is formed by covering the plastic paper 110 on the upper portion of the stainless steel tube material 100 inserted inside the primary mold 8a. The first forming step to press the upper portion of the stainless steel tube material 100 to be opened by 20 to 60 degrees (α), and the second stainless steel tube material 100 formed in the primary molding step. After inserting the inside of the mold (8b) to cover the plastic paper 110 on the upper portion of the stainless steel tube material 100, the stainless steel tube material (100) by pressing the upper portion of the stainless steel tube material 100 as a secondary pressing hole (6b) ), The upper part is opened by 80 to 120 ° (β) to form a rectangular flat portion 122, the secondary molding step, and the stainless steel tube material 100 formed in the secondary molding step is a tertiary mold (8c) After inserting into the inner side of the stainless steel tube material 100, covering the plastic paper 110 on the upper portion, the stainless steel tube material 100 as a third pressing hole (6c) Pressing the upper part to open the upper portion of the material 100 to 180 ° to form a flange portion 121, and the third and third, forming the pipe fitting 120 through the third and third forming step 1050 The heat treatment step of heat treatment at ~ 1100 ℃ and the inner and outer entire surface of the pipe fitting 120 subjected to the heat treatment step is made of a cutting step of completing the processing of the pipe fitting 120.

In addition, the pipe fitting forming apparatus for forming a pipe fitting according to the present invention, as shown in Figure 5, the basic component is the support (2) vertically in the upper four corners of the bed (1) like a conventional press The upper plate (3) having a hydraulic cylinder (4) is fixedly installed on the upper side of the earth (2), and the pressing plate (5) guided up and down to the support (2) is installed below the upper plate (3). It is installed so that the hydraulic cylinder 4 can move up and down.

In addition, the pressing plate 5 is provided with a pressing hole 6 for pressing the stainless steel tube material 100 inserted into the mold 8 to form the fitting 120, which is downwardly installed, and an upper portion of the bed 1. The seating stand 7 is provided in the upper part, and the mold 8 is seated and installed in the upper part of the seating stand 7 with a space part below.

In addition, the mold (8) is formed of a material seating groove (83) into which the stainless steel tube material (100) is inserted to form a pipe joint, and the material to be press-processed under the material seating groove (83). The raising hole 91 which pushes up and pulls out the material while inserting the lower side of the pressing hole is inserted, and the raising hole 91 is provided so that the end portion protrudes to the lower side of the mold 8. And a support plate 9 supporting the end of the lifting hole 91 is installed at the lower side of the mold 8, and both ends of the support plate 9 are installed on the pressing plate 5 downwardly. It is coupled to the end of the) and can be raised and lowered together with the pressing plate 5 and the pressing hole 6, so that when the pressing plate 5 rises, the molded material can be taken out.

In addition, the mold 8 and the pressing hole 6 while pressing the material step by step while opening the one end of the straight tube-shaped stainless steel tube material 100 in stages with a flange portion 121 with a pipe fitting 120 ) Is formed by dividing into 1, 2, 3rd mold features (8a) (8b) (8c) and 1, 2, 3rd pressing holes (6a) (6b) (6c).

The primary mold 8a has a primary inclined portion 81a upwardly slanted at a predetermined angle (α: 20 to 60 °) inside the material seating groove 83, and the primary pusher 6a ) Is a flat stepped portion 62 is formed on the front end of the primary pressing portion 61a and the primary pressing portion inclined at the same angle as the primary inclined portion 81a.

In addition, the secondary mold 8b has a secondary inclined portion 81b inclined upward at a predetermined angle (β: 80 to 120 °) inside the material seating groove 83, and the secondary push hole (6b) is provided with a second pressing portion (61b) inclined at the same angle as the second inclined portion (81b) and the second flat pressing portion (62, 63) in the upper and lower front circumference of the second pressing portion (second) 61b) is formed with an insertion protrusion 64 inserted into the inner diameter of the stainless steel tube material 100 to be formed, the lower planar projection 63 is formed larger than the inner diameter of the stainless steel tube material 100 to be molded have.

In addition, the tertiary mold 8c has a flange forming stepped portion 82 formed inside the material seating groove 83, and the tertiary presser 6c has a flat bottom surface and is formed of stainless steel tube 100. ), The upper part of the () is expanded to 180 degrees to form the flange portion 121.

Referring to Figures 2 to 5 will be described the functional relationship between the pipe fitting method and the pipe forming apparatus of the present invention configured as described above with reference to FIG.

After preparing three 1,2,3 presses, the 1st mold 8a and the 1st presser 6a are installed in the 1st press, and the 2nd mold 8b and the 2nd press are installed in the 2nd press. Each presser 6b is provided, and a tertiary press 8c and a tertiary presser 6c are respectively installed in the 3rd press.

After each of the molds and the pressing holes are installed in the three 1,2,3 presses as shown in Figs. 2 and 3, the first molding step of the first fitting (8a) is shown. After the lubricant is applied to the inside of the material seating groove 83, the stainless steel tube material 100 is inserted into the material seating groove 83, and then the upper surface of the primary mold 8a and the upper portion of the stainless steel tube material 100 are placed. The upper portion of the stainless steel tube material 100 is gradually pressed as the primary pressing portion 61a installed downward on the lower side of the pressing plate 5 by covering the plastic sheet 110 to cover and lowering the pressing plate 5.

At this time, the primary pressing portion 61a of the primary pressing hole 6a and the primary inclined portion 81a of the primary mold 8a are inclined at an angle of 20 to 60 °, respectively, so that the stainless steel pipe The upper portion of the material 100 is opened by 20 to 60 ° (α), and a flat stepped portion 62 is formed on the upper outer periphery of the primary pressing portion 61a of the primary pressing hole 6a. It is to be prevented from spreading or rupturing more than the end of the open end is caught by the flat stepped portion 62.

As described above, after the tip portion of the stainless steel tube 100 is inclined at an angle of 20 to 60 ° by the pressing force of the primary pressing hole 6a, the pressing plate 5 is raised by the action of the hydraulic cylinder 4. The pressing plate 5 and the supporting plate 9 connected as the long bolt 10 are raised together. As the supporting plate 9 is raised, the lifting plate 91 installed downward in the lower side of the primary mold 8a is supported by the supporting plate 9. It is pushed up by) is inserted into the material seating groove 83 of the primary mold (8a) is the stainless steel pipe material 100 is opened and pushed to the upper side is automatically taken out.

At this time, the plastic paper 110 covered on the upper portion of the stainless steel tube material 100 is the primary pressing hole (6a) when pressing the upper portion of the stainless steel tube material 100, the outer peripheral surface and the stainless steel tube (6a) While being sandwiched between the inner circumferential surfaces of the material 100, the plastic paper 110 is lubricated to facilitate the extraction of the formed stainless steel tube material 100.

After the primary molding is completed as described above, the lubricant is applied to the material seating grooves 83 of the secondary mold 8b of the secondary press, which is the secondary molding step, and the primary molded stainless steel tube 100 is formed of the secondary mold ( 8b) after inserting into the material seating groove 83, covering the plastic paper 110 on the upper portion of the stainless steel tube material 100 and pressing the stainless steel tube material 100 by lowering the secondary presser 6b, The flange portion 121 formed by the pressing force of the secondary presser 6b is the secondary presser 61b of the secondary presser 6b and the secondary inclined portion of the secondary mold 8b ( 81b), the inclination angle of 80 to 120 ° (β) will be widened second.

At this time, the insertion protrusion 64 formed on the bottom of the secondary pressing portion 61b is slightly smaller than the inner diameter of the stainless steel tube material 100 to be molded, so it is inserted into the stainless steel tube material 100 to be molded and is made of stainless steel tube material. It is supported by the inside of (100).

In this state, the flat stepped portion 62 is formed at the top edge of the second pressing portion 61b, so that the entire edge of the end portion of the flange portion 121 that is secondarily caught is caught by the flat stepped portion 62 and moved outward. It will try to push inwards without spreading further.

In such a situation, the outer side is hung on the upper flat stepped portion 62, and the lower side is pushed into the inner side of the stainless tube material 100, which is formed by the insertion protrusion 64, so that it is pushed inwards, but the thickness is pushed out. Is pressed on the flat stepped portion 63 larger than the inner diameter of the stainless steel tube material 100 formed while being supported on the outer circumferential surface of the flat multi-throw portion 62, and a rectangular flat portion 122 is formed at the bending boundary of the stainless steel tube material 100. And the secondary molding is completed.

After the secondary molding is completed as described above, the lubricant is applied to the material seating grooves 83 of the tertiary mold 8c of the tertiary press as the tertiary molding step, and the secondary molded stainless steel tube material 100 is made of the tertiary mold. After inserting into the material seating groove 83 of 8c, the plastic pipe 110 is covered on the upper portion of the stainless steel tube material 100, and then the third presser 6c is lowered to press the stainless steel tube material 100. , The tertiary mold 8c having the flange portion 12 which was secondary molded by the pressing force of the tertiary presser 6c and having the stepped portion 82 flat with the tertiary presser 6c having a flat bottom surface. By the upper portion of the stainless steel tube material 100 is opened by 180 ° to form a flange portion 121.

When the upper portion of the secondary-shaped stainless steel tube 100 is opened at 180 ° as described above to form the flange portion 121, the rectangular flat portion 122 formed at the bending boundary portion has a thinner thickness inwardly. Since the upper part is thick and is formed in a flat shape, when the upper part of the stainless steel tube material 100 is opened at 180 °, the right angle bent part is formed at a right angle to complete the third molding step.

The extraction of the stainless steel tube material 100 formed in the first, second, and third molding steps is attached to the support plate 9 which rises together with the pressing plate 5 by the upward stroke of the hydraulic cylinder 4 in the first molding step. The lower end of the raising hole 91 is pushed up and taken out, and the process of taking out the second and third molded stainless steel tube 100 is performed by lubricating the plastic paper 110 and the stainless steel tube 100. Is taken out smoothly is the same as working in the primary molding step.

After the 1, 2, 3 molding step as described above, as a heat treatment step, the pipe fitting 120 formed by 180 ° of the flange portion 121 is heat-treated at 1050 to 1100 ° C. to remove magnetism and increase the strength. After the work is completed, the entire inner and outer surfaces of the pipe fitting 120 are cut to suit the dimensions defined as the cutting step, thereby completing the processing of the pipe fitting 120.

As described above, the stainless steel pipe is molded by press processing by the pipe fitting and the molding method and the pipe fitting forming apparatus according to the present invention, thereby significantly reducing the defective rate in the production of the pipe fitting, By improving the working method, the productivity of the fittings is improved.

Claims (2)

The upper portion of the stainless steel tube material 100 is pressed by covering the plastic paper 110 on the upper portion of the stainless steel tube material 100 inserted into the primary mold 8a and pressing the upper portion of the stainless steel tube material 100 as the primary pusher 6a. A first molding step to be opened by ˜60 ° (α), After inserting the stainless steel tube material 100 formed in the first molding step into the inside of the secondary mold 8b, the plastic pipe 110 is covered on the upper portion of the stainless steel tube material 100, and the secondary push hole 6b As a secondary molding step to press the upper portion of the stainless steel tube material 100 to the upper portion of the stainless steel tube material 100 by 80 to 120 ° (β) to form a rectangular plane portion 122, After inserting the stainless steel tube material 100 formed in the secondary molding step into the third mold 8c, the plastic paper 110 is covered on the upper portion of the stainless steel tube material 100, and the third push hole 6c is formed. As a third step of forming the flange portion 121 by pressing the upper portion of the stainless steel tube material 100 to open the upper portion of the material 100 by 180 °, A heat treatment step of heat-treating the pipe fitting 120 formed through the first, second, and third molding steps at 1050 to 1100 ° C .; Pipe fitting forming method characterized in that it comprises a cutting step of completing the processing of the pipe fitting 120 by cutting the entire inner and outer surfaces of the pipe fitting 120 undergoes the heat treatment step. The support (2) is vertically installed on the upper corner of the bed (1), and the upper plate (3) on which the hydraulic cylinder (4) is fixed is installed on the upper part of the support (2). The hydraulic cylinder 4 for raising and lowering the pressing plate 5 which is lowered and guided to the support 2 is installed below the upper plate 3, In the conventional press in which the pressing hole 6 is installed downward in the pressing plate 5 and the mold 8 is installed in the seating table 7 installed on the upper part of the bed 1. The seating plate 7 is provided with a support plate 9 having a lifting hole 91 for taking out the stainless steel tube material 100 in the central space of the mold 8, and the support plate 9 and the pressing plate 5. ) Is installed as a long bolt (10), The mold 8 and the presser 6 are the first and second molds 8a, 8b and 8c and the 1,2 and 3rd pressers 6a and 6b so as to press the raw materials in stages. 6c), The primary mold 8a has a primary inclined portion 81a inclined upward at an angle α of 20 to 60 ° inside the material seating groove 83, and the primary pusher 6a is A flat stepped portion 62 is formed on the first pressing portion 61a inclined at the same angle as the first inclined portion 81a and the upper circumference of the first pressing portion. The secondary mold 8b has a secondary inclined portion 81b inclined upward at an angle β of 80 to 120 ° inside the material seating groove 83, and the secondary press hole 6b is formed. The secondary pressing portion 61b and the secondary pressing portion 61b inclined at the same angle as the secondary inclined portion 81b are respectively provided with flat stepped portions 62 and 63 on the upper and lower ends of the secondary pressing portion. Insertion protrusion 64 is formed on the bottom, The tertiary mold (8c) is a flange forming stepped portion 82 is formed inside the material seating groove 83, the tertiary pressing hole (6c) is a pipe fitting, characterized in that the bottom is formed flat. Molding equipment