CN108714649B - Forming die and forming method for 180-degree bent pipe - Google Patents
Forming die and forming method for 180-degree bent pipe Download PDFInfo
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- CN108714649B CN108714649B CN201810430215.5A CN201810430215A CN108714649B CN 108714649 B CN108714649 B CN 108714649B CN 201810430215 A CN201810430215 A CN 201810430215A CN 108714649 B CN108714649 B CN 108714649B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
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- Bending Of Plates, Rods, And Pipes (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention relates to a 180-degree elbow forming die and a forming method, wherein the 180-degree elbow forming die comprises a die holder (1) and a die head (2), the die holder (1) and the die head (2) are matched up and down, an outer die groove is formed in the die holder, an inner die groove is formed in the die head, the outer die groove is matched with the inner die groove, the outer die groove and the inner die groove are combined into a shaping through groove under the condition that the die holder and the die head are matched inside and outside, the shaping through groove comprises straight grooves a at two ends and an arc-shaped groove b at the middle section of the bottom, the straight grooves a are in an inverted V shape, and the notch. The forming die of this application can be with straight pipe plastic for having the return bend semi-manufactured goods of particular structure, return bend semi-manufactured goods obtains final product through the rounding process again, 180 return bends that relative direct plastic obtained, and this application can show and reduce the plastic degree of difficulty, improves the lumber recovery, reduces the mutual wearing and tearing between mould and the pipe fitting.
Description
Technical Field
The invention belongs to the technical field of bent pipe forming, and particularly relates to a thermal forming die and a forming method for a 180-degree bent pipe.
Background
The direction change of the pipelines in the arrangement process is commonly encountered, the direction change difficulty of the pipelines made of different materials is different, elbow joints are often required to be configured on the metal pipelines with high strength, the joints are provided with elbows with 90 degrees and large angles, and the 180-degree elbows are required to be designed in order to adapt to 180-degree reversing.
At present, the elbow is mainly formed by straight pipe thermoforming, a thermoforming mold is in a standard semicircular arc shape, a pipe opening is also circular, the mold is easy to bite the straight pipe, machining marks can appear on the pipe wall in the forming process, the abrasion degree of the mold is large, and the mold and a pipe fitting are abraded mutually.
In the process of shaping the circular tube by using the circular die, the contact area between the die and the circular tube is large, and the mutual abrasion is more serious, so that the bite is formed. The 180 ° elbow has a larger deformation angle and more serious abrasion, so that the improvement of the traditional 180 ° elbow forming method is a problem to be considered by those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 180-degree elbow pipe forming die aiming at the prior art, wherein a straight round pipe is directly thermoformed into a special-shaped 180-degree elbow pipe semi-finished product by the die, the special-shaped 180-degree elbow pipe semi-finished product comprises a middle arc-shaped elbow pipe section and two end straight pipe sections, the pipe orifices of the straight pipe sections are oval, and the two oval straight pipe sections of the semi-finished product are rounded to obtain a final 180-degree elbow pipe.
The invention also aims to develop a 180-degree elbow forming method capable of relieving abrasion between a pipe fitting and a die by utilizing the die, so that the surface quality of the elbow is improved, and the service life of the die is prolonged.
The technical scheme adopted by the invention for solving the problems is as follows: the 180-degree elbow forming die comprises a die holder and a die head, wherein the die holder and the die head are matched up and down, an outer die groove is formed in the die holder, an inner die groove is formed in the die head, the outer die groove is matched with the inner die groove, the outer die groove and the inner die groove are combined into a shaping through groove in the inward and outward matched state of the die holder and the die head, the shaping through groove comprises a straight groove a at two ends and an arc-shaped groove b at the middle section of the bottom, which are in the shape of an inverted V, and the radial section of the straight groove a is elliptical.
Preferably, the top of the die head is provided with a pressure bearing platform.
Preferably, the die holder is supported on the bottom plate, so that the support is more stable, and the pressure on the ground is reduced.
In order to facilitate the transportation of the die, fork plates are arranged on two sides of the die holder and are relatively higher than the bottom surface of the die holder. The fork plate is arranged to facilitate lifting of the forklift to the template.
When the shaping device is used, a heated round straight pipe is placed on the die holder, the die head is placed until the die head and the die holder are folded, a heavy object is placed above the pressure-bearing platform, the pipe fitting is shaped in the shaping through groove, the pipe fitting is shaped into a 180-degree bent pipe semi-finished product matched with the shaping through groove, the two sides of the pipe fitting are straight pipes, the pipe orifice is oval, the middle section of the pipe is an arc-shaped round pipe, and straight pipes at the two ends of the shaped 180-degree bent pipe are shaped into the round straight pipe through shaping, so that a.
The invention also provides a forming method of the 180-degree bent pipe, which comprises the following steps: the method comprises the following steps of firstly, carrying out thermal forming on a circular tube through a forming die to form a 180-degree bent tube semi-finished product, wherein the 180-degree bent tube semi-finished product comprises straight tubes with two ends in a splayed shape and an arc-shaped circular tube which is positioned between the straight tubes at the two ends and has transition, and the radial section of each straight tube is in an oval shape; and reshaping the straight pipes at two ends of the semi-finished product of the 180-degree bent pipe into round straight pipes to obtain the 180-degree bent pipe, wherein the radial section of the bent pipe is round.
The forming die comprises a die holder and a die head, wherein the die holder and the die head are matched up and down, an outer die groove is formed in the die holder, an inner die groove is formed in the die head, the outer die groove is matched with the inner die groove, the outer die groove and the inner die groove are combined into a shaping through groove in the inward and outward matched state of the die holder and the die head, the shaping through groove comprises a straight groove a at two ends and an arc-shaped groove b at the middle section of the bottom, the straight groove a is inverted-V-shaped, and the radial cross section of the straight groove a is oval. The raw material round pipe is shaped into a 180-degree bent pipe semi-finished product through the die
The shaping of the straight pipe is to shape the straight elliptic pipe into a straight circular pipe through a rounding die. The rounding die is an existing die, can be used for reshaping straight tubes at two ends of a semi-finished product by using a straight tube rounding die, and can also be used for reshaping by using a die similar to a semi-finished product forming die, the rounding die and the reshaping die are identical in structure, and the difference is that a straight groove a of the rounding die is a round straight groove, namely the radial section of the straight groove a is round.
Optionally, the circular tube is a straight circular tube or a bent circular tube. When a straight round tube is selected as a shaping raw material, the main deformation lies in the middle section, the straight tube becomes an arc tube, meanwhile, the two ends of the straight tube are changed into an elliptical tube from the round tube under the condition that the straight tube is inconvenient to store, the deformation amplitude of the whole is small, and the shaping is easier. When the bent pipe is selected as a shaping raw material, the main deformation is located at two ends, arcs at the two ends are straightened, the circular pipe is changed into an elliptical pipe, the axial deformation and the radial deformation occur simultaneously, the abrasion of the surface of the pipe fitting is reduced, and the surface quality is improved.
Compared with the prior art, the invention has the advantages that: the utility model provides a 180 return bend forming die, the plastic passageway that has special shape, the centre is the arc wall, and both sides are the straight flute, and the notch of straight flute is oval, and this plastic structure can reduce the wearing and tearing of each other between mould and pipe fitting, has improved the quality of return bend, and the life of mould has also obtained the extension.
The key point of the 180-degree elbow forming method is that the two ends with large shaping degree are firstly shaped into the oval straight pipes, and then the oval straight pipes are rounded, so that the difficulty in shaping the elbows can be reduced, and the abrasion between the die and the pipe fittings can be reduced.
Drawings
FIG. 1 is a forming mold for a 180 degree elbow of the prior art;
FIG. 2 is a schematic view of a forming die according to an embodiment of the present invention;
FIG. 3 is a partial schematic view of a forming mold according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1
As shown in fig. 2-3, a 180-degree elbow forming die comprises a die holder 1, a die head 2, a die holder 1 and a die head 2 which are mutually independent and are matched up and down, an outer die groove is formed in the die holder 1, an inner die groove is formed in the die head 2, the outer die groove is matched with the inner die groove, the die head 2 is placed on the die holder 1, the die holder 1 and the die head 2 are combined inside and outside, the outer die groove and the inner die groove are combined into a shaping through groove, the shaping through groove comprises a straight groove a at two ends of an inverted 'eight' shape and an arc-shaped groove b at a middle (transition) section at the bottom, and a notch (radial section) of the straight groove a is oval.
The top of the die head 2 is provided with a pressure bearing platform 4 for bearing heavy objects in the thermal forming process.
The bottom surface of the die holder 1 is welded with a bottom plate 5, and the whole forming die is arranged on the ground through the bottom plate, so that the support is more stable.
And fork plates 3 are arranged on two sides of the die holder 1, and the fork plates 3 are relatively higher than the bottom surface of the die holder 1 and carry the die with a forklift.
The mould can process the 180-degree elbow with the straight pipe section, and the pipe orifice of the straight pipe section is in an oval shape, so that mutual abrasion between the mould and the pipe fitting in the shaping process is reduced, no trace is left on the surface of the pipe fitting, and the surface quality is better. In order to facilitate the butt welding of the elbow pipe and other round straight pipes, the straight pipe section can be shaped into a circle from an oval shape through the rounding die, and the operation of shaping the oval pipe into a round pipe relatively reduces the abrasion to the die and the pipe fitting compared with other rounding dies.
Example 2
A180 degrees bend forming method, pass the shaping die thermal forming of embodiment 1 into 180 degrees bend semifinished material first round tube, the 180 degrees bend semifinished material includes the straight tube that both ends present the "eight" word and locates at the middle of the straight tube of both ends, arc round tube that the transition, and the radial cross-section of the straight tube is oval; and (3) reshaping the straight pipes at two ends of the semi-finished product of the 180-degree bent pipe into round straight pipes through a rounding die (transverse die) to obtain the 180-degree bent pipe, wherein the radial section of the bent pipe is round.
Compared with the surface quality of a product which is directly formed by one-step hot forming through a shaping die, the surface quality of the 180-degree bent pipe which is prepared by the forming method and has the two ends of the circular straight pipe and the middle of the circular pipe is better, and no abrasion trace exists. The overall yield is higher.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (5)
1. A forming method of a 180-degree elbow pipe is characterized by comprising the following steps: firstly, thermally forming a circular tube into a semi-finished 180-degree bent tube by a forming die, wherein the semi-finished 180-degree bent tube comprises straight tubes with two ends in a splayed shape and an arc-shaped circular tube which is positioned between the straight tubes at the two ends and has transition, and the radial section of each straight tube is in an oval shape; reshaping straight pipes at two ends of the semi-finished product of the 180-degree bent pipe into round straight pipes to obtain the 180-degree bent pipe, wherein the radial section of the bent pipe is round;
the forming die comprises a die holder (1) and a die head (2), wherein the die holder (1) and the die head (2) are matched up and down, an outer die groove is formed in the die holder, an inner die groove is formed in the die head, the outer die groove is matched with the inner die groove, the outer die groove and the inner die groove are combined into a shaping through groove in an inward and outward involutive state of the die holder and the die head, the shaping through groove comprises a straight groove a at two ends of an inverted V shape and an arc-shaped groove b at the middle section of the bottom, and the radial section of the straight groove a is oval;
the shaping of the straight pipe is to shape the straight elliptical pipe into a straight circular pipe through a rounding die.
2. A method of forming a 180 ° elbow according to claim 1, wherein: the round pipe is a straight pipe or a bent pipe.
3. A method of forming a 180 ° elbow according to claim 1, wherein: and a pressure-bearing platform (4) is arranged at the top of the die head (2).
4. A method of forming a 180 ° elbow according to claim 1, wherein: the die holder (1) is supported on the bottom plate (5).
5. A method of forming a 180 ° elbow according to claim 1, wherein: fork plates (3) are arranged on two sides of the die holder (1), and the fork plates (3) are relatively higher than the bottom surface of the die holder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810430215.5A CN108714649B (en) | 2018-05-08 | 2018-05-08 | Forming die and forming method for 180-degree bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810430215.5A CN108714649B (en) | 2018-05-08 | 2018-05-08 | Forming die and forming method for 180-degree bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108714649A CN108714649A (en) | 2018-10-30 |
| CN108714649B true CN108714649B (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810430215.5A Active CN108714649B (en) | 2018-05-08 | 2018-05-08 | Forming die and forming method for 180-degree bent pipe |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201543720U (en) * | 2009-12-01 | 2010-08-11 | 无锡市新峰管业有限公司 | Hot-press forming mould of thickness elbow tube fitting |
| CN202162280U (en) * | 2011-07-18 | 2012-03-14 | 湖北通达股份有限公司 | Coreless rolling circularity die |
| CN202343760U (en) * | 2011-12-12 | 2012-07-25 | 江苏新恒基重工有限公司 | High-pressure elbow forming die |
| CN208787336U (en) * | 2018-05-08 | 2019-04-26 | 江阴市天柠管道有限公司 | A kind of 180 ° of bent pipe molds |
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2018
- 2018-05-08 CN CN201810430215.5A patent/CN108714649B/en active Active
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| CN108714649A (en) | 2018-10-30 |
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