CN114378160A - Pipe fitting processing device - Google Patents
Pipe fitting processing device Download PDFInfo
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- CN114378160A CN114378160A CN202210036767.4A CN202210036767A CN114378160A CN 114378160 A CN114378160 A CN 114378160A CN 202210036767 A CN202210036767 A CN 202210036767A CN 114378160 A CN114378160 A CN 114378160A
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- pipe
- bending
- pipe fitting
- die
- fitting body
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- 238000012545 processing Methods 0.000 title claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 86
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000003754 machining Methods 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/04—Bending tubes using mandrels or the like the mandrel being rigid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- 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
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
Abstract
The invention discloses a pipe fitting processing device which comprises a bending die, a clamping die and a pressure die, wherein a pipe fitting body is arranged between the bending die and the clamping die, a core rod is arranged in the pipe fitting body, and the pressure die and the bending die rotate by a bending angle by taking the bending die as a center so that the core rod bends the pipe fitting body by a set angle. The pipe fitting processing device provided by the invention combines a high-precision laser measurement technology, so that the specific motion numerical value of the actual extension amount of the core bar is efficiently judged, the thickness reduction rate and the section distortion rate of the outer side wall of the bent pipe are reduced, the optimal extension amount of the core bar is calculated, and the yield of pipe fittings is improved.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a pipe fitting machining device.
Background
Due to the characteristics of the laser, the measured target object can be measured with high precision, the object can be distinguished with high stability, and the actual motion data of the moving object can be detected. In the bending forming process, the extension amount of the core rod directly influences the thickness reduction rate and the section distortion rate of the outer side wall of the elbow, in the processing and assembling process of the die, the problems of part precision and assembling errors exist, and after the installation is completed, different complete machines often have different optimal core rod extension amounts, so that the high precision of the whole machine can be detected by utilizing laser, the core rod extension amount can be used in the debugging of the whole machine assembly, the installation and debugging efficiency is improved, and the debugging time is shortened.
However, the existing pipe bending processing is to bend a long pipe and then perform length processing, the finished product rate of pipe processing is low, and the thickness reduction rate and the section distortion rate of the outer side wall of the pipe are improved.
Disclosure of Invention
In order to solve the technical problems of reducing the thickness reduction rate and the section distortion rate of the outer side wall of the pipe fitting in the background technology, the pipe fitting processing device is provided, the actual installation and debugging efficiency is improved, and the installation cost is reduced.
In order to achieve the purpose, the specific technical scheme of the pipe fitting processing device is as follows:
a pipe fitting machining device comprises a bending die, a clamping die and a pressure die, wherein a pipe fitting body is arranged between the bending die and the clamping die, a core rod is arranged in the pipe fitting body, and the pressure die and the bending die rotate by a bending angle by taking the bending die as a center so that the core rod bends the pipe fitting body by a set angle.
Further, the method can be used for preparing a novel materialThe bending radius of the pipe fitting body is R, and the outer diameter of the pipe fitting body is D0The diameter of the core rod is DmThe wall thickness of the pipe fitting body is t, the clearance of the maximum diameter of the pipe fitting body in the inner diameter of the pipe fitting body is u, and u is equal to D0-2t-Dm。
Further, the relative bending radius R/D of the pipe fitting body is less than 1.5, and the pipe fitting body is inserted into the core rod.
Further, the horizontal distance of the core rod from the bending center at the maximum bending diameter is referred to as the protrusion e,
further, R is the sum of the bending radius and one half of the inner diameter of the pipe fitting body, and R in the formula is converted into the bending radius and the inner diameter of the pipe fitting body to obtain the following result:
further, the range of the protrusion amount of the mandrel is (1/2-2/3) e.
Further, pipe fitting body wall thickness is t, and the wall thickness is t1 after bending, then the wall thickness rate of reducing is:
further, d0 and d1 are the sizes of the pipe body before bending, d0min and d1min are the sizes of the cross section of the pipe body after bending, and the cross section distortion rate is expressed as:
furthermore, the extension range of the core rod is 0.96 times of the inner diameter of the pipe fitting body, so that the pipe fitting body simultaneously meets the thickness reduction rate and the section distortion rate of the outer side wall of the elbow.
Further, the device also comprises a laser detection structure for detecting the position of the elongation of the core rod.
The pipe fitting processing device has the following advantages:
the pipe fitting processing device provided by the invention combines a high-precision laser measurement technology, so that the specific motion numerical value of the actual extension amount of the core bar is efficiently judged, the thickness reduction rate and the section distortion rate of the outer side wall of the bent pipe are reduced, the optimal extension amount of the core bar is calculated, and the yield of pipe fittings is improved.
Drawings
FIG. 1 is a schematic structural view of a pipe machining apparatus according to the present invention;
FIG. 2 is a schematic view of a part of the structure of the pipe machining apparatus of the present invention;
FIG. 3 is a schematic structural view of the tube body of the present invention;
FIG. 4 is a simplified diagram of the calculation of the protrusion of the core rod according to the present invention.
The notation in the figure is:
1. a laser detection structure; 2. a bearing seat; 3. a core bar; 4. a core print; 5. a bending die; 6. clamping the die; 7. a tube body; 8. and (4) pressing the die.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The pipe machining apparatus of the present invention will be described with reference to fig. 1 to 4.
Due to the characteristics of the laser, the measured target object can be measured with high precision, the object can be distinguished with high stability, and the actual motion data of the moving object can be detected. In the bending forming process, the extension amount of the core rod 3 directly influences the thickness reduction rate and the section distortion rate of the outer side wall of the elbow, in the processing and assembling process of the die, the problems of part precision and assembling errors exist, and after the installation is completed, different complete machines often have different optimal extension amounts of the core rod 3, so that the high precision of the whole machine can be detected by utilizing laser, the core rod can be used in the debugging of the whole machine assembly, the installation and debugging efficiency is improved, and the debugging time is shortened. The numerical value of the extension amount of the core rod 3 in the same equipment or different pipe fittings can be counted, the actual motion parameters are subjected to data counting and data fitting, the numerical relation between the extension amount of the core rod 3 and the pipe diameter of each equipment is obtained, and therefore the bending process is efficiently completed.
The pipe fitting processing device provided by some embodiments of the invention comprises a bending die 5, a clamping die 6 and a pressure die 8, wherein a pipe fitting body 7 is arranged between the bending die 5 and the clamping die 6, a mandrel is arranged in the pipe fitting body 7, and the pressure die 8 and the bending die 5 rotate by a bending angle with the bending die 5 as a center so that the mandrel bends the pipe fitting body 7 by a set angle. In the specific using equipment of the pipe machining device provided by the invention, under the condition of servo control, the oil cylinder drives the clamping die 6 to move so as to clamp a bent piece, and the core rod 3 moves under the positioning action of the profiling guide seat to move to the initial bending size of the core rod: 0.95 inner diameter of the pipe body 7, under the feedback of the laser detection structure 1, the core rod 3 stops moving, the right swing arm performs bending rotary motion around the bending bearing seat 2 by using the bending center of the bending die, the laser detection structure 1 measures the specific numerical value of the extension amount after bending forming, whether the bending pipe body 7 meets the cross section distortion rate and the wall thickness reduction rate is detected, if yes, the movement is suspended, the parameters are stored, and data fitting is performed; if not, the parameters are stored for data analysis and parameter fine tuning, and debugging processing is carried out again. The core rod here comprises a core rod 3 and a core print 4.
The copper pipe is bent by cold bending, and the bending becomes an important bending process of the pipe body 7 due to the characteristics of high efficiency and high accuracy. The core bending and the coreless bending can be classified according to whether the core rod is used in the bending process of the pipe fitting body 7. The selection of the mode of the cored bent pipe and the coreless bent pipe is mainly determined according to the size of the relative bending radius R/D, and when the R/D is more than 1.5, coreless bending is usually adopted; R/D < 1.5 is, core wrap bending is usually adopted. At present, in production practice, the U-shaped pipe of the air conditioner 'two units' is mostly determined to have a relative bending radius R/D < 1.5, so that a core rod must be inserted into the pipe body 7 for supporting during bending forming. The bending device mainly comprises a bending die 5, a core rod (two parts of a core rod 3 and a core print 4), a pressure die 8, a clamping die 6 and the like. The copper pipe is arranged between the bending die 5 and the clamping die 6, and a core rod is inserted into the copper pipe; the clamping die 6 clamps the copper pipe, so that the copper pipe is completely contacted with the bending die 5, and the pressure die 8 and the bending die 5 rotate by a set bending angle by taking the bending die 5 as a center; the clamping die 6 is released to take out the pipe fitting body 7.
In general, the form of the mandrel can be divided into two broad categories: the fixed core rod is simple in processing process and convenient to manufacture, but the fixed core rod cannot move along with the bending process, so that the crease-resistant effect is poor, and the core rod is easy to seriously thin and break when the bending moment is too large. For the movable core rod, the head of the core rod can rotate within a certain angle along with the bending process, so that the crease-resistant effect is better than that of a fixed core rod; however, the movable core rod has a complicated structure, is difficult to design and process, and has a high cost for using the movable core rod.
We refer to the horizontal distance of the core rod from the bending centre at its maximum bending diameter as the protrusion e. As shown in the diagram of the calculation of the extension of fig. 4, let the bending radius of the pipe fitting body 7 be R and the outer diameter of the pipe fitting body 7 be D0The diameter of the core rod is DmThe wall thickness of the pipe fitting body 7 is t, thenThe maximum diameter of the pipe fitting body 7 is located at the clearance u of the inner diameter of the pipe fitting body 7, then
u＝D0-2t-Dm
In the bending process of the pipe fitting body 7, a position (mandrel extension) away from a mandrel supporting point on the outer side of the pipe wall is e, a downward displacement is generated under the action of bending moment, and when the longitudinal displacement reaches the size u of the gap between the pipe wall and the mandrel, the pipe fitting body 7 is in contact with the mandrel, as shown in fig. 4, the pipe fitting body comprises:
the formula is arranged to obtain:
r is the sum of the bending radius and one half of the inner diameter of the pipe, and R in the formula is converted into the bending radius and the inner diameter of the pipe fitting body 7 to obtain the following product:
the above formula is a theoretical reference calculation formula of the extension amount of the pipe fitting body 7. In the actual production process, the extension amount of the mandrel is selected in the range of 1/2-2/3 times of the extension amount of the e mandrel, the extension amount e of the material with larger deformation resistance is closer to the upper limit value, and the extension amounts with different lengths are selected according to different materials, so that the position of the mandrel placed in the bending process directly influences whether the pipe fitting body 7 is smoothly bent. In the production practice, the extension amount of the core rod directly influences the thickness reduction rate and the section distortion rate of the outer side wall of the elbow, and if the extension amount of the core rod is too small, the elbow is easy to destabilize and wrinkle; if the mandrel protrudes too much, interference with the inner wall of the pipe body 7 may occur, directly resulting in the "poking-through" of the interference region of the pipe body 7. In the bending process of the pipe fitting body 7, the extension range of the mandrel is taken as 0.96 time of the inner diameter of the pipe fitting body 7 as a reference object according to experience, and fine adjustment processing is required on the basis when the pipe fitting is bent, so that the pipe fitting body 7 meets the thickness reduction rate and the section distortion rate of the outer side wall of the bent pipe. The wall thickness reduction rate and the sectional distortion rate will be described in detail below.
(1) Wall thickness reduction rate:
in the bending forming process of the pipe body 7, under the action of bending moment, the inner side material is compressed to shorten and thicken, and the outer side material is pulled to elongate and thin. The thick increase of pipe fitting body 7 inside wall, the thick attenuate of outside wall are inevitable, in order to improve the quality and the precision of pipe fitting body 7 bending, will reduce pipe fitting body 7's wall thickness variation as far as possible, get original wall thickness and be t, and the wall thickness is t1 after the bending, and then the wall thickness rate of thinning is:
(2) cross-sectional distortion rate:
in the bending forming process of the pipe fitting body 7, under the action of bending moment, the outer side material can deviate towards the bending center under the action of tangential tensile stress resultant force, and the material on the inner side of the bend can be far away from the bending center under the action of tangential compressive stress, so that after the bending forming process of the pipe fitting body 7 is finished, the cross section of the bend pipe is distorted, and the cross section is deformed from a circular shape to an approximately elliptical shape. As shown in fig. 2, d0 and d1 represent the sizes of the tubes before bending, d0min and d1min represent the sizes of the cross sections of the tubes after bending, and the cross-sectional distortion rate is expressed as:
therefore, the quality problem of the bent piece is directly determined by the value of the extension amount, but the bending die has an error phenomenon in the material processing and assembling process, the difference between the actual extension amount and the theoretical extension amount data is large, the position of the core head 4 is also likely to change and loosen in the bending process, the dynamic change of the extension amount can be measured in real time through a laser detection technology, data processing and difference value fitting are carried out on the dynamic change, and the dynamic relation between the extension amount of the core rod and the thickness reduction rate and the section distortion rate of the outer side wall of the bent pipe is calculated.
The pipe fitting processing device provided by the invention combines a high-precision laser measurement technology, so that the specific motion numerical value of the actual extension amount of the core bar 3 is efficiently judged, the thickness reduction rate and the section distortion rate of the outer side wall of the bent pipe are reduced, the extension amount of the optimal core bar 3 is calculated, and the yield of pipe fittings is improved.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The pipe fitting machining device is characterized by comprising a bending die, a clamping die and a pressure die, wherein a pipe fitting body is arranged between the bending die and the clamping die, a core rod is arranged in the pipe fitting body, and the pressure die and the bending die rotate a bending angle by taking the bending die as a center so that the core rod bends the pipe fitting body by a set angle.
2. The pipe machining device of claim 1, wherein the pipe body has a bend radius R and an outer diameter D0The diameter of the core rod is DmThe wall thickness of the pipe fitting body is t, the clearance of the maximum diameter of the pipe fitting body in the inner diameter of the pipe fitting body is u, and u is equal to D0-2t-Dm。
3. A pipe machining apparatus as claimed in claim 2, characterized in that the pipe body, into which the mandrel is inserted, has a relative bending radius R/D < 1.5.
4. A tube machining device according to claim 2, characterized in that the horizontal distance of the mandrel from the bending centre at the maximum bending diameter is called the protrusion e,
5. a pipe machining apparatus as claimed in claim 4, wherein R is the sum of the bend radius and one half of the internal diameter of the pipe body, and R in the formula is obtained by replacing R with the bend radius and the internal diameter of the pipe body:
6. the pipe machining apparatus according to claim 4, wherein the protrusion of the mandrel is in a range of (1/2-2/3) e.
7. The pipe fitting processing device according to claim 1, wherein the wall thickness of the pipe fitting body is t, and the wall thickness after bending is t1, the wall thickness reduction ratio is:
8. a tube processing apparatus as claimed in claim 7, wherein d0, d1 are tube body dimensions before bending, d0min, d1min are tube body cross-sectional dimensions after bending, and the cross-sectional distortion rate is expressed as:
9. the pipe machining apparatus according to claim 8, wherein the mandrel protrudes by an amount in a range of 0.96 times an inner diameter of the pipe body so that the pipe body satisfies both of a thickness reduction rate of an outer side wall of the elbow and a distortion rate of a cross section.
10. A pipe machining apparatus as claimed in claim 1, further comprising laser sensing means for sensing the position of the elongation of the mandrel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210036767.4A CN114378160A (en) | 2022-01-13 | 2022-01-13 | Pipe fitting processing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210036767.4A CN114378160A (en) | 2022-01-13 | 2022-01-13 | Pipe fitting processing device |
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| CN114378160A true CN114378160A (en) | 2022-04-22 |
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-
2022
- 2022-01-13 CN CN202210036767.4A patent/CN114378160A/en active Pending
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