CN113578988A - Special-shaped copper pipe stretching combined die and stretching method - Google Patents
Special-shaped copper pipe stretching combined die and stretching method Download PDFInfo
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- CN113578988A CN113578988A CN202111046689.8A CN202111046689A CN113578988A CN 113578988 A CN113578988 A CN 113578988A CN 202111046689 A CN202111046689 A CN 202111046689A CN 113578988 A CN113578988 A CN 113578988A
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- 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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
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- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
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Abstract
The invention provides a special-shaped copper pipe stretching combined die which comprises a combined core print and a combined outer die matched with the combined core print, wherein the combined core print comprises a moving core print and a special-shaped pipe core print which are sleeved at two ends of a core rod; the combined outer die comprises a diameter-adjusting outer die matched with the special pipe core head and a diameter-reducing outer die matched with the moving core head; the reducing outer die is internally provided with a reducing hole with the same shape as the moving core head, the diameter-adjusting outer die is internally provided with a diameter-adjusting hole with the same shape as the special pipe core head, and the inner diameter of the diameter-adjusting hole is smaller than that of the reducing hole. The invention also provides a drawing method of the special-shaped copper pipe, which realizes continuous drawing forming by matching the combined external die and the combined core print. The invention realizes the continuous drawing of the special-shaped copper pipe, is convenient for realizing the automatic production of the stretching of the special-shaped copper pipe, effectively improves the production efficiency and the yield and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of copper pipe processing, in particular to a special-shaped copper pipe stretching combined die and a stretching method.
Background
The main pipelines of the heat exchanger of the water heater mainly adopt special-shaped copper pipes such as a cross pipe, a D-shaped pipe and a round bubble pipe, so that the heat exchange efficiency is improved, and the hot water outlet time is shortened. At present, the production of the special-shaped pipe adopts a fixed short core head drawing mode by straight drawing machine equipment due to irregular cross section, is completed by a drawing die and a fixed short core head together, and before drawing, a copper pipe needs to be firstly compressed into a pipe with an oval shape and other transitional section shapes by other equipment, and then the pipe is drawn to form a finished special-shaped pipe straight pipe. The production mode of the intermittent stretching of the single straight material has low efficiency, can not form continuous stretching, needs to fix the short core head, has high labor intensity of operators and high energy consumption, has adverse effects on the smooth arrangement of production orders, the reduction of production cost, the development of water heater industry and the like, and has great significance for solving the problem of low-efficiency production of the special pipe.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the special-shaped copper pipe stretching combined die and the stretching method capable of realizing continuous stretching, which are convenient for realizing the automatic production of stretching the special-shaped copper pipe, effectively improve the production efficiency and the yield and reduce the production cost.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a special-shaped copper pipe stretching combined die is characterized by comprising a combined core print and a combined outer die matched with the combined core print, wherein the combined core print comprises a moving core print and a special-shaped pipe core print which are sleeved at two ends of a core rod; the combined outer die comprises a diameter-adjusting outer die matched with the special pipe core head and a diameter-reducing outer die matched with the moving core head; the reducing outer die is internally provided with a reducing hole with the same shape as the moving core head, the diameter-adjusting outer die is internally provided with a diameter-adjusting hole with the same shape as the special pipe core head, and the inner diameter of the diameter-adjusting hole is smaller than that of the reducing hole.
Furthermore, a through hole with the same outer diameter as the core rod is formed in the middle of the special-shaped tube core head, penetrates through the through hole and is fixedly sleeved at one end of the core rod by a nut; the movable core head is fixed at the other end of the core rod through a nut.
Furthermore, the reducing outer die is cylindrical, and the middle of the front surface of the reducing outer die is inwards recessed to form a smooth progressive arc, so that the reducing hole forms an inclined plane deformation section and a cylindrical sizing section.
Furthermore, the floating core head comprises a large-diameter section and a small-diameter section which are connected by a smooth inclined plane, the angle between the inclined plane and the horizontal plane is smaller than the angle between the deformation section of the inclined plane of the reducing outer die and the horizontal plane, and the outer diameter of the large-diameter section of the floating core head is larger than the outer diameter of the cylindrical sizing section of the reducing outer die.
Furthermore, the outer diameter of the floating core head is cylindrical or elliptic cylindrical.
Furthermore, the whole-diameter outer die is cylindrical, a gradual smooth whole-diameter hole is formed in the middle of the front face of the whole-diameter outer die in an inwards recessed mode, and the shape of the minimum inner diameter position of the whole-diameter hole is consistent with that of the special pipe core head.
Furthermore, the moving core head is matched with the reducing outer die and arranged at the inlet end of the copper pipe, and the special-shaped core head is matched with the diameter-adjusting outer die and arranged at the outlet end of the copper pipe.
Furthermore, a through hole with the same outer diameter as the core rod is formed in the middle of the moving core head, and the moving core head is sleeved at one end of the core rod through the through hole in the middle and is fixed by a nut.
Further, the distance between the moving core print and the special pipe core print is the same as the distance between the centers of the reducing outer mold and the diameter-adjusting outer mold.
A method for stretching a special-shaped copper pipe is characterized by comprising the following steps:
1) fixing a special-shaped tube core head at one end of a core rod, sleeving a movable core head at the other end of the core rod, and fixing the movable core head by using a nut after the position is adjusted to form a combined core head;
2) after lubricating oil is poured into the copper pipe blank, the combined core head is arranged in the copper pipe blank, and the end part of the copper pipe blank is sharpened;
3) respectively installing the reducing outer die and the sizing outer die on a stretcher, and enabling the distance between the centers of the reducing outer die and the sizing outer die to be equal to the distance between the floating core print and the special pipe core print; the copper pipe blank tip sequentially penetrates through the reducing outer die and the sizing outer die and then is fixed on a stretcher, the special-shaped pipe core head is arranged inside the sizing outer die, and the moving core head is arranged inside the reducing outer die;
4) starting a drawing machine, and continuously drawing and forming the copper pipe blank through the combined outer die and the combined core print under the drawing action of the drawing machine;
5) and blanking the copper pipe after drawing and forming.
Furthermore, the copper pipe after drawing forming can be directly coiled for blanking and can also be continuously sawed into a straight pipe for blanking.
Furthermore, a combined core head with a moving core head and a special-shaped core head which are connected by a core rod is matched with a combined outer die consisting of a reducing outer die and a sizing outer die for stretching; the moving core head and the reducing outer die are matched to be close to the inlet end of the copper pipe, and the special-shaped core head and the reducing outer die are matched to be close to the outlet end of the copper pipe.
Furthermore, the large-diameter section of the moving core print is close to the inlet end of the copper pipe, and the small-diameter section of the moving core print is close to the special pipe core print.
The special-shaped copper pipe in the invention is various special-shaped pipes such as a cross pipe, a D-shaped pipe, a round bubble pipe and the like, and is not limited to the special-shaped pipes.
Compared with the prior art, the special-shaped copper pipe stretching combined die and the stretching method have the following beneficial technical effects:
the continuous drawing of the special pipe is realized through the mutual matching of the combined external mold and the combined core print, the copper pipe is extruded into the required outer diameter size through the matching of the reducing external mold and the moving core print, and the first drawing is realized; and the shaping of the appearance shape of the copper pipe is realized through the matching of the full-diameter outer die and the special pipe core head, and the secondary drawing is carried out. The production efficiency of mechanical tubes is improved, the continuous drawing of the special-shaped copper tubes is realized, the automatic production of the stretching of the special-shaped copper tubes is realized, the labor intensity of workers is reduced, and the production cost is reduced.
Drawings
FIG. 1 is a longitudinal sectional view of the special-shaped copper tube stretch assembling die of the present invention.
FIG. 2 is a front view of a sizing outer mold in the special-shaped copper pipe stretch assembling die.
Fig. 3 is a schematic structural diagram of a combined core print in the special-shaped copper pipe stretch combined die of the invention.
Fig. 4 is a front view of a special-shaped die head in the special-shaped copper tube stretch assembling die according to the invention.
In the attached drawing, 1 is a special-shaped tube core head, 2 is a core bar, 3 is a moving core head, 4 is a reducing outer die, 5 is a sizing outer die, 6 is a copper tube, 7 is a reducing hole, 8 is a sizing hole, 9 is an inclined plane deformation section, and 10 is a cylindrical sizing section.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to the attached drawings 1-4, the special-shaped copper pipe stretching combined die comprises a combined core print and a combined outer die matched with the combined core print, wherein the combined core print comprises a moving core print 3 and a special-shaped pipe core print 1 which are sleeved at two ends of a core rod 2; the combined external mold comprises a diameter-adjusting external mold 5 matched with the special pipe core head 1 and a diameter-reducing external mold 4 matched with the moving core head 3; the reducing outer die 4 is internally provided with a reducing hole 7 with the same shape as the moving core print 3, the reducing outer die 5 is internally provided with a reducing hole 8 with the same shape as the special pipe core print 1, and the inner diameter of the reducing hole 8 is smaller than that of the reducing hole 7.
The core print is designed into a combined core print formed by the movable core print 3 and the special-shaped tube core print 1, the combined core print is different from the traditional fixed short core print which can only realize intermittent drawing, and the combined core print is a movable core print combination, so that the subsequent drawing is convenient, the continuous drawing is realized, and the production efficiency is improved. The special-shaped tube core head 1 is matched with the sizing outer die 5, the reducing outer die 4 is matched with the moving core head 3 to realize the deformation and the forming of the structure of the copper tube 6, the shaping and the forming are divided into two times, the first moving core head 3 is matched with the reducing outer die 4 to pull to realize the reduction of the integral outer diameter of the copper tube 6, the moving core head 3 is fixed at a reducing hole 7 of the reducing outer die 4, and then the special-shaped tube core head 1 is pulled through the core rod 2 to fix the position of the special-shaped tube core head 1; the second special-shaped tube core head 1 is matched with the full-diameter outer die 5 to shape the appearance of the copper tube 6, so that the outer diameter of the copper tube 6 is formed into a required special-shaped tube shape, and the outer wall of the copper tube 6 is smooth. In the prior art, although continuous high-efficiency drawing can be realized by only adopting one external mold for one-time drawing, the copper pipe 6 is seriously deformed and uneven easily, the pipe wall of the copper pipe 6 is sunken, the cross section of the copper pipe is unqualified, the appearance and the using effect are influenced, and the product percent of pass is influenced. Some prior art draw through twice, but once only become required mechanical tubes, draw for the second time for the sky, draw the appearance and change slightly but also be difficult to realize continuous high efficiency and draw than once, and the appearance of the heterotypic copper pipe 6 that the sky formed of drawing is inhomogeneous, and causes inside pipe diameter too little when tensile range is big easily, influences the heat transfer. The invention adopts a double-mode one-time drawing process to avoid the situation, the overall-diameter external mold 5 and the special-shaped tube core head 1 are matched to deform the appearance of the copper tube 6 on the basis of reducing the external diameter of the original copper tube 6 to form the required special-shaped copper tube, and the external diameter size and the appearance shape of the special-shaped copper tube are integrated, so that the appearance is more attractive, the drawing process is soft, the moving core head 3 and the special-shaped tube core head 1 simultaneously limit the internal diameter and the external diameter of the special-shaped copper tube 6, the phenomenon of the sinking of the tube wall of the copper tube 6 cannot occur, the product percent of pass is high, and the heat exchange effect is improved.
In order to keep the overall consistency of the copper pipe 6 after being drawn, the special-shaped pipe core head 1 and the moving core head 3 are connected to form a fixed combined type core head, a through hole with the same outer diameter as that of the core rod 2 is formed in the middle of the special-shaped pipe core head 1, and the through hole is fixedly sleeved on one end head of the core rod 2 through a nut; the floating core print 3 is fixed on the other end of the core rod 2 through a nut. The distance between the moving core print 3 and the special pipe core print 1 is the same as the distance between the reducing outer mold 4 and the center of the sizing outer mold 5.
In order to improve the drawing efficiency and avoid the deformation of the copper pipe 6, the external reducing die 4 is cylindrical, and the middle part of the front surface of the external reducing die 4 is inwards sunken to form a smooth progressive arc, so that the reducing hole 7 forms an inclined plane deformation section 9 and a cylindrical sizing section 10. The smooth progressive design structure is adopted, so that the copper pipe 6 can be drawn progressively, and the copper pipe 6 is prevented from being deformed due to abrupt excessive drawing.
The floating core head 3 comprises a large-diameter section and a small-diameter section which are connected by a smooth inclined plane, the angle between the inclined plane and the horizontal plane is smaller than the angle between the inclined plane deformation section of the reducing outer mold 4 and the horizontal plane, and the outer diameter of the large-diameter section of the floating core head 3 is larger than the inner diameter of the cylindrical diameter-fixing section of the reducing outer mold 4. Smooth arc-shaped expansion is formed from the minimum diameter position of the reducing hole 7 to the edge of the reducing outer die 4, and the cross section shape of each section of the reducing hole 7 is consistent with the shape of the uniform moving core print 3. During drawing, the diameter of the large end of the moving core print 3 is larger than the diameter of the fixed diameter section of the reducing outer mold 4, the moving core print 3 is clamped at the reducing outer mold hole 4, the special-shaped core print 1 is pulled by the core rod 2, and the special-shaped core print 1 is fixed at the diameter adjusting hole 8 of the diameter adjusting outer mold 5. After the copper pipe 6 is reduced in diameter through the matching of the reducing outer die 4 and the moving core head 3, the sizes such as appearance shape, wall thickness and the like meet the requirements of final products under the combined action of the reducing outer die 5 and the special-shaped core head 1.
In a specific embodiment, in order to shape the appearance of the special-shaped copper pipe 6, the outer wall of the copper pipe 6 is smoother, the heat exchange effect is improved, the copper pipe 6 is conveniently drawn for the second time, and the outer diameter of the moving core head 3 is cylindrical or elliptic cylindrical. When the required outer diameter of the special-shaped copper pipe is larger in diameter difference, such as a cross pipe, the outer diameter of the floating core head 3 is arranged to be elliptic; when the required outer diameter of the special-shaped copper pipe is a D-shaped pipe or a round bubble pipe with small diameter difference, the outer diameter of the floating core head 3 is set to be cylindrical.
The diameter-adjusting outer die 5 is used for adjusting the diameter of the copper pipe 6 after the diameter-reducing outer die 4 is drawn, and secondary drawing is carried out again, the diameter-adjusting outer die 5 is cylindrical, the middle of the front face of the diameter-adjusting outer die 5 is inwards recessed to form a gradual smooth diameter-adjusting hole 8, and the shape of the minimum inner diameter part of the diameter-adjusting hole 8 is consistent with the shape of the special-shaped pipe core head 1. In a preferred embodiment, the shape of the cross section of the constant diameter section of the full diameter hole 8 is consistent with the shape of the special pipe core head 1.
In order to prevent the core print combination from moving forwards in the drawing process and influencing the drawing, the moving core print 3 is matched with the reducing outer mold 4 and is arranged at the inlet end of the copper pipe 6, and the special-shaped core print 1 is matched with the sizing outer mold 5 and is arranged at the outlet end of the copper pipe 6. During drawing, the moving core print 3 tends to move in the drawing direction due to the action of friction force, the diameter of the copper pipe 6 after drawing is reduced due to the existence of the large-diameter section and the small-diameter section which are connected by the smooth inclined surface of the moving core print 3, and the diameter of the reducing hole cylindrical diameter fixing section 10 in the reducing outer die 4 is smaller than the outer diameter of the large-diameter section of the moving core print 3, so that the large-diameter section of the moving core print 3 is clamped in the inclined surface deformation section 9 of the reducing outer die 4 during drawing and cannot move forwards continuously. And due to the action of the drawing force and the friction force of the drawing machine, the combined core print is fixed at the die hole under the action of the pair of balance forces and cannot move forwards and backwards, so that the combined core print is not required to be fixed, and continuous drawing is realized.
In order to fix the moving core head 3 conveniently, a through hole with the same outer diameter as that of the core rod 2 is formed in the middle of the moving core head 3, the moving core head 3 is sleeved at one end of the core rod 2 through the through hole in the middle, and the moving core head is fixed by a nut.
A method for stretching a special-shaped copper pipe comprises the following steps:
1) fixing the special-shaped tube core head 1 at one end of the core rod 2, sleeving the moving core head 3 at the other end of the core rod 2, adjusting the position, and fixing the moving core head 3 by using a nut to form a combined core head;
2) after lubricating oil is poured into the copper pipe 6 blank, the combined core head is arranged in the copper pipe 6 blank, and the end part of the copper pipe 6 blank is sharpened;
3) respectively installing the reducing outer die 4 and the sizing outer die 5 on a stretcher, and enabling the distance between the centers of the reducing outer die 4 and the sizing outer die 5 to be equal to the distance between the floating core print 3 and the special-shaped tube core print 1; the method comprises the following steps of (1) enabling the blank-making tip end of a copper pipe 6 to sequentially penetrate through a reducing outer die 4 and a sizing outer die 5 and then be fixed on a stretcher, enabling a special-shaped pipe core head 1 to be arranged inside the sizing outer die 5, and enabling a moving core head 3 to be arranged inside the reducing outer die 4;
4) starting a drawing machine, and continuously drawing and forming the copper tube 6 blank through the combined outer die and the combined core print under the drawing action of the drawing machine;
5) blanking the copper pipe 6 after drawing forming.
Different blanking modes are selected according to the using mode of the copper pipe. In a specific embodiment, the copper tube 6 after drawing forming is directly coiled and blanked.
In another embodiment, the copper tube 6 after drawing is continuously sawed into a straight tube for blanking.
Specifically, a combined core print with a moving core print 3 and a special-shaped core print 1 which are connected by a core bar 2 is matched with a combined external mold which is composed of a reducing external mold 4 and a sizing external mold 5 for stretching.
When the combined core print is assembled, the large-diameter section of the moving core print 3 is close to the inlet end of the copper pipe 6, and the small-diameter section of the moving core print 3 is close to the special-shaped core print 1; the moving core print 3 and the reducing outer mold 4 are matched and close to the inlet end of the copper pipe 6, and the special-shaped core print 1 and the sizing outer mold 5 are matched and close to the outlet end of the copper pipe 6. In the stretching process, the copper pipe 6 is firstly extruded, drawn and reduced through the moving core print 3 and the reducing outer mold 4, and then is secondarily drawn and shaped through the special-shaped core print 1 and the diameter-adjusting outer mold 5 to form the special-shaped copper pipe 6.
Lubricating oil is filled in the copper pipe 6, so that friction between the special-shaped pipe core head 1 and the copper pipe 6 is reduced, abrasion of the core head is avoided, stretching operation is facilitated, the special-shaped pipe core head 1 can push the lubricating oil forward along with movement of the copper pipe 6 in the stretching process, waste of the lubricating oil is reduced, and the lubricating property in the stretching process at the later stage is also guaranteed. The end part of the copper pipe 6 blank is sharpened, so that the copper pipe 6 can be conveniently inserted into the combined die when the operation is started, and the combined core head can be prevented from sliding out of the port before stretching.
The invention realizes the continuous stretching of the special-shaped copper pipe 6, improves the stretching efficiency, directly carries out continuous blanking on the stretched special-shaped copper pipe 6 in the stretching process, has simple working procedure, improves the labor efficiency and reduces the production cost.
The special-shaped copper pipe 6 in the invention is various special-shaped pipes such as a cross pipe, a D-shaped pipe, a round bubble pipe and the like, and is not limited to the above special-shaped pipes.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a tensile assembling die of abnormal shape copper pipe which characterized in that: the special-shaped die comprises a combined core print and a combined outer die matched with the combined core print, wherein the combined core print comprises a moving core print and special-shaped core prints which are sleeved at two ends of a core rod; the combined outer die comprises a diameter-adjusting outer die matched with the special pipe core head and a diameter-reducing outer die matched with the moving core head; the reducing outer die is internally provided with a reducing hole with the same shape as the moving core head, the diameter-adjusting outer die is internally provided with a diameter-adjusting hole with the same shape as the special pipe core head, and the inner diameter of the diameter-adjusting hole is smaller than that of the reducing hole.
2. The special-shaped copper pipe stretching combination die as claimed in claim 1, wherein: a through hole with the same outer diameter as the core rod is formed in the middle of the special pipe core head, penetrates through the through hole and is fixedly sleeved at one end of the core rod by a nut; the movable core head is fixed at the other end of the core rod through a nut.
3. The special-shaped copper pipe stretching combination die as claimed in claim 1, wherein: the reducing outer die is cylindrical, and the middle of the front surface of the reducing outer die is inwards recessed to form a smooth progressive arc, so that the reducing hole forms an inclined plane deformation section and a cylindrical sizing section.
4. A special-shaped copper pipe stretching combination die as claimed in claim 3, characterized in that: the floating core head comprises a large-diameter section and a small-diameter section which are connected by a smooth inclined plane, the angle between the inclined plane and the horizontal plane is smaller than the angle between the inclined plane deformation section of the reducing outer mold and the horizontal plane, and the outer diameter of the large-diameter section of the floating core head is larger than the outer diameter of the cylindrical diameter-fixing section of the reducing outer mold.
5. The special-shaped copper pipe stretching combination die as claimed in claim 1, wherein: the outer diameter of the floating core head is cylindrical or elliptic cylindrical.
6. The special-shaped copper pipe stretching combination die as claimed in claim 1, wherein: the whole-diameter outer die is cylindrical, the middle of the front face of the whole-diameter outer die is recessed inwards to form a gradual smooth whole-diameter hole, and the shape of the minimum part of the inside diameter of the whole-diameter hole is consistent with that of the special-shaped die core head.
7. The special-shaped copper pipe stretching combination die as claimed in claim 1, wherein: the moving core head is matched with the reducing outer die and arranged at the inlet end of the copper pipe, and the special-shaped core head is matched with the sizing outer die and arranged at the outlet end of the copper pipe.
8. A method for stretching a special-shaped copper pipe is characterized by comprising the following steps:
1) fixing a special-shaped tube core head at one end of a core rod, sleeving a movable core head at the other end of the core rod, and fixing the movable core head by using a nut after the position is adjusted to form a combined core head;
2) after lubricating oil is poured into the copper pipe blank, the combined core head is arranged in the copper pipe blank, and the end part of the copper pipe blank is sharpened;
3) respectively installing the reducing outer die and the sizing outer die on a stretcher, and enabling the distance between the centers of the reducing outer die and the sizing outer die to be equal to the distance between the floating core print and the special pipe core print; the copper pipe blank tip sequentially penetrates through the reducing outer die and the sizing outer die and then is fixed on a stretcher, the special-shaped pipe core head is arranged inside the sizing outer die, and the moving core head is arranged inside the reducing outer die;
4) starting a drawing machine, and continuously drawing and forming the copper pipe blank through the combined outer die and the combined core print under the drawing action of the drawing machine;
5) and blanking the copper pipe after drawing and forming.
9. A method for drawing a shaped copper tube as claimed in claim 8, wherein: drawing by using a combined core print which is connected by a core bar and is provided with a moving core print and a special-shaped core print, and matching with a combined external mold which is composed of a reducing external mold and an integral external mold; the moving core head and the reducing outer die are matched to be close to the inlet end of the copper pipe, and the special-shaped core head and the reducing outer die are matched to be close to the outlet end of the copper pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111046689.8A CN113578988A (en) | 2021-09-06 | 2021-09-06 | Special-shaped copper pipe stretching combined die and stretching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111046689.8A CN113578988A (en) | 2021-09-06 | 2021-09-06 | Special-shaped copper pipe stretching combined die and stretching method |
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| Publication Number | Publication Date |
|---|---|
| CN113578988A true CN113578988A (en) | 2021-11-02 |
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|---|---|---|---|
| CN202111046689.8A Pending CN113578988A (en) | 2021-09-06 | 2021-09-06 | Special-shaped copper pipe stretching combined die and stretching method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118180183A (en) * | 2024-03-29 | 2024-06-14 | 常州润来科技有限公司 | Large-diameter smooth copper pipe manufacturing equipment for cooling tower and application method of large-diameter smooth copper pipe manufacturing equipment |
-
2021
- 2021-09-06 CN CN202111046689.8A patent/CN113578988A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118180183A (en) * | 2024-03-29 | 2024-06-14 | 常州润来科技有限公司 | Large-diameter smooth copper pipe manufacturing equipment for cooling tower and application method of large-diameter smooth copper pipe manufacturing equipment |
| CN118180183B (en) * | 2024-03-29 | 2024-08-06 | 常州润来科技有限公司 | Large-diameter smooth copper pipe drawing equipment for cooling tower and application method thereof |
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