CN114054617B - Production process of clamping and pressing bent pipe - Google Patents
Production process of clamping and pressing bent pipe Download PDFInfo
- Publication number
- CN114054617B CN114054617B CN202111353281.5A CN202111353281A CN114054617B CN 114054617 B CN114054617 B CN 114054617B CN 202111353281 A CN202111353281 A CN 202111353281A CN 114054617 B CN114054617 B CN 114054617B
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- Prior art keywords
- pipe
- punching
- blank pipe
- flaring
- blank
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000003825 pressing Methods 0.000 title claims abstract description 28
- 238000004080 punching Methods 0.000 claims abstract description 51
- 238000005452 bending Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 5
- 239000010962 carbon steel Substances 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 description 4
- 241000755266 Kathetostoma giganteum Species 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
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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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
-
- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
-
- 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
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
- F16L43/001—Bends; Siphons made of metal
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a production process of a clamping and pressing bent pipe, and belongs to the technical field of pipe fittings. It solves the problem of low manufacturing precision. It comprises the following steps: a. cutting the next section from the carbon steel round tube to be used as a blank tube; b. punching and flaring one end of the blank pipe; c. the method comprises the steps of modifying a die cavity of a clamp of a pipe bending machine to have a shape matched with one end of a blank pipe subjected to punching flaring, clamping one end of the blank pipe subjected to punching flaring by using the clamp, and bending the blank pipe; d. c, punching and flaring the other end of the blank pipe obtained in the step c; e. and d, respectively and inwards wrapping two end parts of the outer expansion parts at two ends of the blank pipe obtained in the step d, so that convex rings with grooves at the inner sides are respectively formed by the two outer expansion parts. It has the advantages of high manufacturing precision, reliable structure, etc.
Description
Technical Field
The invention belongs to the technical field of pipe fittings, and relates to a production process of a clamping and pressing bent pipe.
Background
In some existing pipeline systems, for example, a clamping-pressing type connecting pipe is gradually used in a tap water or gas system, and after the thin-wall stainless steel is inserted into the clamping-pressing type connecting pipe, a special hydraulic tool is used for clamping outside the clamping-pressing type connecting pipe, so that the thin-wall stainless steel pipe and the clamping-pressing type connecting pipe can be fixed together. The clamping and pressing type connecting pipes are various in forms, and a straight pipe, a three-way pipe, a bent pipe and the like are common.
At present, for the production of the clamping and pressing bent pipe, after a straight pipe is bent through a pipe bending machine, punching and flaring are carried out on two ends of the bent pipe simultaneously, and then edge wrapping is carried out on two end parts of the pipe, so that two ends of the pipe are finally molded into a clamping and pressing structure for realizing clamping and pressing fixation. During bending, one end of the straight pipe is clamped by a clamp in the pipe bending machine, and then the straight pipe is bent from the middle position by corresponding parts in the pipe bending machine. However, in the actual process, slip between the straight pipe and the clamp often occurs to cause running of the straight pipe when the straight pipe is bent (running is easy to occur when the bent straight pipe is larger in size), so that the actual size and the design size of the finally produced clamping and pressing bent pipe are easy to come in and go out, namely, the manufacturing precision is difficult to guarantee.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a production process of a clamping and pressing bent pipe, which solves the problem of low manufacturing precision.
The aim of the invention can be achieved by the following technical scheme:
the production process of the clamping and pressing bent pipe is characterized by comprising the following steps of:
a. cutting the next section from the carbon steel round tube to be used as a blank tube;
b. punching and flaring one end of the blank pipe, so that the end of the blank pipe is formed to sequentially comprise a second outer flaring part and a first outer flaring part, wherein the inner diameter of the first outer flaring part is smaller than that of the second outer flaring part, and the length of the first outer flaring part is larger than that of the second outer flaring part;
c. the method comprises the steps of modifying a die cavity of a clamp of a pipe bending machine to have a shape matched with one end of a blank pipe subjected to punching flaring, clamping one end of the blank pipe subjected to punching flaring by using the clamp, and bending the blank pipe;
d. c, punching and flaring the other end of the blank pipe obtained in the step c to obtain a first flaring part and a second flaring part which have the same shape as those in the step b;
e. and d, respectively and inwards wrapping two end parts of the outer expansion parts at two ends of the blank pipe obtained in the step d, so that convex rings with grooves at the inner sides are respectively formed by the two outer expansion parts.
During production, one end of the carbon steel round tube is cut to be used as a blank tube, and then one end of the blank tube is punched and flared to form the end of the blank tube into an outer flaring part II which sequentially comprises an outer flaring part I and an outer flaring part II with the inner diameter larger than that of the outer flaring part I; then, modifying a clamp of the pipe bending machine, enabling a cavity of the clamp to have a shape matched with one end of the blank pipe subjected to punching flaring, clamping one end of the blank pipe subjected to punching flaring by using the clamp to form a position, and bending the blank pipe; and finally, the two end parts of the outer expansion parts at the two ends of the blank pipe are respectively and inwards covered, so that convex rings with grooves at the inner sides are respectively formed at the two outer expansion parts, and thus the clamping and pressing bent pipe with clamping and pressing structures at the two ends is formed.
The production process comprises the steps of punching and flaring one end of a blank pipe, modifying a clamp on a pipe bending machine to enable the shape of a cavity of the clamp to be matched with one end of the blank pipe after punching and flaring, and reliably positioning the blank pipe by utilizing the matching of the clamp cavity and the shape of one end of the blank pipe after punching and flaring when bending the blank pipe, so that the slip phenomenon in the bending process, namely the blank pipe cannot run, can be avoided, the accuracy of the design size is ensured, and the manufacturing precision is improved. Moreover, the shape of the blank pipe subjected to punching flaring forming in advance is just the same as the shape before the clamping and pressing structure is formed by actually wrapping edges in the conventional process, so that the normal forming of the clamping and pressing structure is ensured while the manufacturing precision is improved.
In the above production process of the clamping and pressing elbow pipe, in the step b, the blank pipe is punched and flared by adopting a pipe end forming machine, the adopted punch head is provided with a punching section II and a punching section I along the punching direction, the outer diameter of the punching section I is larger than the inner diameter of the blank pipe, and the outer diameter of the punching section I is larger than the outer diameter of the punching section I.
The punch with the structure is adopted in the pipe end forming machine, one end of the blank pipe can be preformed into the first outer expansion part and the second outer expansion part with the inner diameter larger than that of the first outer expansion part, so that the blank pipe can be matched with a clamp with a corresponding cavity on the pipe bending machine to prevent slipping during bending, and the manufacturing precision is improved.
In the production process of the clamping and pressing bent pipe, in the step d, two punches which are the same as those in the step b are adopted to be respectively inserted into two ends of the blank pipe, one punch is used for shaping one end of the blank pipe after punching and flaring, and the other punch is used for punching and flaring the other end of the blank pipe.
The clamp of the pipe bending machine has clamping force on the punched and flared end of the blank pipe in the process of bending the blank pipe, which possibly causes a little deformation of the end of the blank pipe, so that the end of the blank pipe can be shaped by inserting the punch into the end of the blank pipe in the step d, the manufacturing precision is improved, and meanwhile, the reliability of manufacturing the clamping bent pipe by adopting the production process is ensured.
In the production process of the clamping bent pipe, the clamp of the pipe bending machine comprises a wheel die and a clamping die which can be close to the wheel die, in the step c, a half cavity which can enable the wheel die and the clamping die to be attached to the outside of one end of the punched flaring of the blank pipe obtained in the step b is respectively arranged on one side of the wheel die, opposite to the clamping die, and when the wheel die and the clamping die are close to each other, the two half cavities are combined to form a cavity with the same shape as one end of the punched flaring of the blank pipe.
Through the arrangement, the wheel die can be firmly positioned by matching with the shape of one end of the punched flaring of the blank pipe when being close to each other, so that the blank pipe is ensured not to slip during bending, and the manufacturing precision is ensured.
In the production process of the clamping and pressing bent pipe, the two ends of the blank pipe are subjected to flat-head chamfering before the step d and the step e.
And d, after the other end of the blank pipe is punched and flared in the step, the two ends of the blank pipe are subjected to flat-head chamfering, so that the consistency of the sizes of the two ends of the blank pipe can be ensured, and the manufacturing precision is further improved.
In the production process of the clamping and pressing bent pipe, after the step e, sealing rings are respectively arranged in grooves at two ends of the blank pipe.
Compared with the prior art, the production process of the clamping and pressing bent pipe comprises the steps of firstly punching and flaring one end of a blank pipe, modifying a clamp on a pipe bending machine to enable the shape of a cavity of the clamp to be matched with one end of the blank pipe after punching and flaring, and reliably positioning the blank pipe by utilizing the matching of the shape of the clamp cavity and the shape of one end of the blank pipe after punching and flaring when bending the blank pipe, so that the slip phenomenon in the bending process, namely the blank pipe cannot run, the blank pipe cannot be elongated, the accuracy of the design size is guaranteed, and the manufacturing precision is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a blank tube from step a to step c.
FIG. 2 is a schematic cross-sectional view of a clamp of the pipe bender.
Fig. 3 is a schematic cross-sectional view of step d.
Fig. 4 is a schematic view of the blank tube after being hemmed.
In the figure, 1, a blank pipe; 1a, an external expansion part I; 1b, an external expansion part II; 1c, a convex ring; 1d, grooves; 2. a clamp; 2a, a cavity; 2b, a wheel mold; 2c, clamping the die; 2d, half cavity; 3. a punch; 3a, stamping a section I; 3b, stamping the second section.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The production process of the clamping and pressing bent pipe comprises the following steps:
a. the next section is cut from the carbon steel round tube as a blank tube 1.
b. As shown in fig. 1, one end of a blank pipe 1 is punched and flared, so that the end of the blank pipe 1 is formed to sequentially comprise a second flaring portion 1b and a first flaring portion 1a with an inner diameter smaller than that of the second flaring portion 1b, and the length of the first flaring portion 1a is longer than that of the second flaring portion 1b;
in this step, a pipe forming machine is specifically used to perform punching and flaring on one end of the blank pipe 1, the adopted punch 3 has a punching section two 3b and a punching section one 3a along the punching direction, the outer diameter of the punching section one 3a is larger than the inner diameter of the blank pipe 1, and the outer diameter of the punching section two 3b is larger than the inner diameter of the blank pipe 1 and larger than the outer diameter of the punching section one 3 a. In actual operation, the blank pipe 1 is fixed in the pipe forming machine, then the punch 3 is punched into one end of the blank pipe 1, and the end of the blank pipe 1 is extruded outwards to form the pipe comprising the first expansion part 1a and the second expansion part 1b under the drive of the punch 3.
c. The die cavity 2a of the clamp 2 of the pipe bending machine is modified to have a shape matched with one end of the blank pipe 1 subjected to punching flaring, the blank pipe 1 is directly bent after one end of the blank pipe 1 is clamped by the clamp 2 after the blank pipe 1 is subjected to punching flaring, and the bending angle in the step is specifically 90 degrees;
specifically, as shown in fig. 2, the clamp 2 of the pipe bender comprises a wheel die 2b and a clamping die 2c which can approach the wheel die 2b, and is modified by arranging a half cavity 2d which can be attached to one end of the blank pipe 1 obtained in the step b and is stamped and flared at the opposite side of the wheel die 2b and the clamping die 2c respectively, and combining the two half cavities 2d to form a cavity 2a with the same shape as one end of the blank pipe 1 and stamped and flared at the same time when the wheel die 2b and the clamping die 2c are close.
d. C, punching and flaring the other end of the blank pipe 1 obtained in the step c to obtain a first flaring part 1a and a second flaring part 1b which have the same shape as those in the step b;
in this step, as shown in fig. 3, two punches 3 identical to those in step b are respectively inserted into two ends of the blank pipe 1, and one of the punches 3 can press the end outwards to form an outer flaring portion 1a and an outer flaring portion 1b when inserted into the end without punching flaring; the clamp 2 of the tube bending machine has a clamping force on the end of the blank tube 1 that has been punched and flared during bending of the blank tube 1, which may slightly deform the end of the blank tube 1, so that insertion of the blank tube 1 through the other punch 3 can reshape the end of the blank tube 1 that has been punched and flared.
Then, the blank pipe 1 is subjected to flat chamfering at both ends.
e. And d, respectively and inwards wrapping the end parts of the second outer expansion parts 1b at the two ends of the blank pipe 1 obtained in the step d, wherein the two outer expansion parts 1b respectively form convex rings 1c with grooves 1d at the inner sides through wrapping, as shown in fig. 4, and the first outer expansion parts 1a are clamped by clamping tools during actual clamping and fixing. Then, sealing rings are respectively arranged in the grooves 1d at the two ends of the blank pipe 1.
According to the production process, one end of the blank pipe 1 is punched and flared, the clamp 2 on the pipe bender is set to be provided with the clamp 2 with the die cavity 2a matched with the shape of the one end of the blank pipe 1 after punching and flaring, and when the blank pipe 1 is bent, the die cavity 2a of the clamp 2 and the shape of the one end of the blank pipe 1 after punching and flaring are matched to form reliable positioning, so that the slipping phenomenon in the bending process, namely the blank pipe 1 cannot run, the blank pipe 1 cannot be elongated, the accuracy of the design size is guaranteed, and the manufacturing precision is improved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The production process of the clamping and pressing bent pipe is characterized by comprising the following steps of:
a. cutting the next section from the carbon steel round tube to be used as a blank tube (1);
b. punching and flaring one end of the blank pipe (1) to enable the end of the blank pipe (1) to sequentially comprise a second outer flaring part (1 b) and a first outer flaring part (1 a) with the inner diameter smaller than that of the second outer flaring part (1 b) along the punching direction, wherein the length of the first outer flaring part (1 a) is larger than that of the second outer flaring part (1 b);
c. the method comprises the steps of modifying a die cavity (2 a) of a clamp (2) of a pipe bending machine to have a shape matched with one end of a blank pipe (1) subjected to punching flaring, clamping one end of the blank pipe (1) subjected to punching flaring by the clamp (2), and bending the blank pipe (1);
d. simultaneously, two punches (3) which are the same as those in the step b are respectively inserted into two ends of the blank pipe (1), one punch (3) is used for shaping one end of the blank pipe (1) after punching and flaring, and the other punch (3) is used for punching and flaring the other end of the blank pipe (1) to obtain a first flaring part (1 a) and a second flaring part (1 b) which are the same as those in the step b;
e. and d, respectively and inwards wrapping the end parts of the second outer expansion parts (1 b) at the two ends of the blank pipe (1) obtained in the step d, so that the two second outer expansion parts (1 b) respectively form convex rings (1 c) with grooves (1 d) at the inner sides.
2. The process for producing the clamping and pressing bent pipe according to claim 1, wherein in the step b, the blank pipe (1) is punched and flared by adopting a pipe end forming machine, the adopted punch (3) is provided with a punching section II (3 b) and a punching section I (3 a) along the punching direction, the outer diameter of the punching section I (3 a) is larger than the inner diameter of the blank pipe (1), and the outer diameter of the punching section II (3 b) is larger than the outer diameter of the punching section I (3 a).
3. The process for producing the clamping and pressing bent pipe according to claim 1, wherein the clamp (2) of the pipe bending machine comprises a wheel die (2 b) and a clamping die (2 c) which can be close to the wheel die (2 b), in the step c, a half cavity (2 d) which can enable the wheel die (2 b) and the clamping die (2 c) to be attached to the outside of one end of the punched and flared mouth of the blank pipe (1) obtained in the step b is respectively arranged on the opposite side of the wheel die (2 b) and the clamping die (2 c), and when the wheel die (2 b) and the clamping die (2 c) are close to each other, the two half cavities (2 d) are combined to form a cavity (2 a) which has the same shape as the one end of the punched and flared mouth of the blank pipe (1).
4. A process for manufacturing a snap bend according to claim 1, 2 or 3, characterized in that the blank tube (1) is subjected to a flat chamfer at both ends before step e after step d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111353281.5A CN114054617B (en) | 2021-11-16 | 2021-11-16 | Production process of clamping and pressing bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111353281.5A CN114054617B (en) | 2021-11-16 | 2021-11-16 | Production process of clamping and pressing bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114054617A CN114054617A (en) | 2022-02-18 |
| CN114054617B true CN114054617B (en) | 2024-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111353281.5A Active CN114054617B (en) | 2021-11-16 | 2021-11-16 | Production process of clamping and pressing bent pipe |
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| Country | Link |
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| CN (1) | CN114054617B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH689222A5 (en) * | 1997-06-27 | 1998-12-31 | Strub Ag | A device for expanding a pipe. |
| JP2009045665A (en) * | 2007-08-22 | 2009-03-05 | Towa Kogyo:Kk | Bending method of tubular body with flare |
| CN105980081A (en) * | 2013-11-18 | 2016-09-28 | 日新制钢株式会社 | Form rolling method for fluid delivery pipe joint section and fluid delivery pipe |
| CN109622785A (en) * | 2019-01-23 | 2019-04-16 | 国琳(天津)科技有限公司 | Multistation elbow pipe piece forming machine |
| CN209736390U (en) * | 2019-04-16 | 2019-12-06 | 维格斯(上海)流体技术有限公司 | multifunctional forming device for clamping and pressing type pipe fitting |
| CN212857447U (en) * | 2020-07-06 | 2021-04-02 | 太仓胜威机械设备有限公司 | Automatic flaring equipment of steel pipe |
| CN113369364A (en) * | 2021-07-26 | 2021-09-10 | 佛山市永恒液压机械有限公司 | Method for forming clamping and pressing pipe |
-
2021
- 2021-11-16 CN CN202111353281.5A patent/CN114054617B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH689222A5 (en) * | 1997-06-27 | 1998-12-31 | Strub Ag | A device for expanding a pipe. |
| JP2009045665A (en) * | 2007-08-22 | 2009-03-05 | Towa Kogyo:Kk | Bending method of tubular body with flare |
| CN105980081A (en) * | 2013-11-18 | 2016-09-28 | 日新制钢株式会社 | Form rolling method for fluid delivery pipe joint section and fluid delivery pipe |
| CN109622785A (en) * | 2019-01-23 | 2019-04-16 | 国琳(天津)科技有限公司 | Multistation elbow pipe piece forming machine |
| CN209736390U (en) * | 2019-04-16 | 2019-12-06 | 维格斯(上海)流体技术有限公司 | multifunctional forming device for clamping and pressing type pipe fitting |
| CN212857447U (en) * | 2020-07-06 | 2021-04-02 | 太仓胜威机械设备有限公司 | Automatic flaring equipment of steel pipe |
| CN113369364A (en) * | 2021-07-26 | 2021-09-10 | 佛山市永恒液压机械有限公司 | Method for forming clamping and pressing pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114054617A (en) | 2022-02-18 |
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