CN117900360B - Quick start type copper pipe internal thread forming device and method - Google Patents
Quick start type copper pipe internal thread forming device and method Download PDFInfo
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- CN117900360B CN117900360B CN202410135898.7A CN202410135898A CN117900360B CN 117900360 B CN117900360 B CN 117900360B CN 202410135898 A CN202410135898 A CN 202410135898A CN 117900360 B CN117900360 B CN 117900360B
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- copper pipe
- inner sleeve
- sleeve
- pipe blank
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 137
- 239000010949 copper Substances 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007667 floating Methods 0.000 claims abstract description 49
- 238000004513 sizing Methods 0.000 claims abstract description 29
- 238000009987 spinning Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 210000001503 joint Anatomy 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/08—Making helical bodies or bodies having parts of helical shape internal screw-threads
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the technical field of copper pipe processing, in particular to a rapid start type copper pipe internal thread forming device and a rapid start type copper pipe internal thread forming method, wherein the rapid start type copper pipe internal thread forming device comprises the following steps: the forming assembly comprises a pre-reducing die, a spinning die, a pre-reducing die and a sizing die which are arranged along the feeding direction of the copper pipe blank; the mold core assembly comprises a core rod, a floating core head and a threaded core head, wherein the core rod is positioned in the copper pipe blank, and the floating core head and the threaded core head are sleeved on the core rod; the positioning assembly comprises a shell, an outer sleeve, an inner sleeve and an elastic piece, wherein the outer sleeve is arranged in the shell, one end of the inner sleeve extends into the outer sleeve, the other end of the inner sleeve forms a step surface and is in butt joint with the outer end surface of the shell, the elastic piece is sleeved on the outer side surface of the inner sleeve, one end of the elastic piece is in butt joint with the step surface, and the other end of the elastic piece is in butt joint with the end surface of the outer sleeve facing the inner sleeve; the pre-reducing die and the reducing die are respectively arranged at one end of the inner sleeve facing the outside and the inside of the shell; the invention can realize the rapid and accurate positioning of the core rod and ensure the whole production efficiency.
Description
Technical Field
The invention relates to the technical field of copper pipe processing, in particular to a rapid start type copper pipe internal thread forming device and method.
Background
The internal thread copper pipe is a tubular structure with a constant-height tooth structure inside, has large internal surface area, can effectively improve heat exchange efficiency, is widely applied to industries such as air conditioner refrigeration, and provides new requirements on the pipe diameter, quality, heat exchange efficiency and the like of the internal thread copper pipe along with the development trend of miniaturization and light weight of an air conditioner.
In the related art, a step-type integrated core rod is adopted, a double reducing and double sizing process is matched, and the internal thread copper pipe can be subjected to one-time pultrusion, so that the process flow of a product is simplified, the production efficiency is improved, but before the pultrusion, the step-type integrated core rod is required to be preset in a copper pipe blank and is moved to a designated position under the action of rotary pultrusion, so that a floating core head on the core rod is correspondingly arranged with a reducing die, the thread core head and the rotating die are correspondingly arranged, the internal sealing of the pultrusion equipment cannot be accurately observed, the steps are difficult to be successful at one time, the position of the core rod is required to be determined by repeatedly stopping the copper pipe blank, the copper pipe blank and the processing time are wasted, and the overall production efficiency of the internal thread copper pipe is affected.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the quick start type copper pipe internal thread forming device is capable of realizing quick and accurate positioning of the core rod and guaranteeing overall production efficiency of the internal thread copper pipe.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a quick start copper tube internal thread forming device, comprising: the molding assembly, the mold core assembly and the positioning assembly;
the forming assembly comprises a pre-reducing die, a rotating die, a preset diameter die and a sizing die which are arranged along the feeding direction of the copper pipe blank, and the copper pipe blank sequentially passes through the pre-reducing die, the rotating die, the preset diameter die and the sizing die for stretch forming;
The die core assembly comprises a core bar, a floating core head and a threaded core head, wherein the core bar is positioned in the copper pipe blank, and the floating core head and the threaded core head are sleeved on the core bar;
The positioning assembly comprises a shell, an outer sleeve, an inner sleeve and an elastic piece, wherein the outer sleeve is arranged in the shell, one end of the inner sleeve extends into the outer sleeve, the other end of the inner sleeve forms a step surface and is in butt joint with the outer end surface of the shell, the elastic piece is sleeved on the outer side surface of the inner sleeve, one end of the elastic piece is in butt joint with the step surface, and the other end of the elastic piece is in butt joint with the end surface of the outer sleeve, which faces the inner sleeve; the pre-reducing die is arranged at one end of the inner sleeve facing the outside of the shell, and the reducing die is arranged at one end of the inner sleeve facing the inside of the shell;
The copper pipe blank drives the mold core assembly to move towards one side where the sizing mold is located under the action of stretch forming, the outer sleeve moves towards one side far away from the inner sleeve in the shell, and the elastic piece forms elastic acting force on the step surface of the inner sleeve, so that the inner sleeve floats along the axial direction of the inner sleeve under the elastic abutting action of the elastic piece and the stretch forming action of the copper pipe blank;
when the outer sleeve moves to the limit position, the floating core head is matched with the reducing die, and the inner sleeve moves towards one side of the outer sleeve under the stretching forming effect of the copper pipe blank;
When the inner sleeve moves to the position that the step surface is abutted against the outer end surface of the shell, the inner sleeve moves to the limit position, and at the moment, the mold core assembly moves to the set position, so that the floating core head is matched with the reducing mold, and the threaded core head is matched with the spinning die.
Furthermore, the side of the pre-reducing die, the pre-reducing die and the sizing die, which faces the feeding direction of the copper pipe blank, forms an arc-shaped surface, so that the diameter of the copper pipe blank is gradually reduced when the copper pipe blank passes through the arc-shaped surface.
Further, the two ends of the inner sleeve are respectively provided with a first die sleeve and a second die sleeve which are arranged corresponding to the pre-reducing die and the reducing die, the first die sleeve and the second die sleeve enable the pre-reducing die and the reducing die to be connected with the inner sleeve respectively, a propping cylinder is arranged in the inner sleeve, and two end faces of the propping cylinder are respectively propped against the end faces of the first die sleeve and the second die sleeve which are oppositely arranged.
Further, the shell, the outer sleeve and the inner sleeve are all provided with connecting grooves, connecting ports are formed in the positions, opposite to the connecting grooves, of the second die sleeve, and a fastener sequentially penetrates through the connecting grooves of the shell, the outer sleeve and the inner sleeve and is connected with the connecting ports in the second die sleeve.
Further, two pairs of stop blocks and connecting pieces are arranged on the inner sleeve, the inner sleeve is located in the concave end face of one end outside the shell, a groove communicated with the inner sleeve is formed, the bottom of the groove and the end face of the first die sleeve, which is away from the second die sleeve, are located on the same plane, the two stop blocks are symmetrically arranged at the bottom of the groove through the corresponding connecting pieces, and the stop blocks and the first die sleeve form partial abutting action.
Further, a first key groove is formed in the inner side wall of the shell along the axial direction, a first positioning key corresponding to the first key groove is arranged on one side, facing the shell, of the outer sleeve, and the first positioning key is fixed on one side, far away from the inner sleeve, of the outer sleeve; the inner sleeve is characterized in that a second key groove is formed in the inner side wall of the inner sleeve along the axial direction, a second positioning key corresponding to the second key groove is arranged on one side of the propping cylinder facing the inner sleeve, and the second positioning key is fixed on one side, close to the pre-reducing die, of the propping cylinder.
Further, the core rod is of a split structure and comprises an extension section, a first connecting section and a second connecting section, the first connecting section and the second connecting section are respectively positioned at two ends of the extension section, the floating core head and the threaded core head are respectively sleeved on the first connecting section and the second connecting section, and the free ends of the first connecting section and the second connecting section are respectively connected through a first nut and a second nut in a threaded manner, so that the floating core head and the threaded core head are limited;
The first nut comprises a head and a long rod, a connecting cavity is formed at one end of the long rod facing the first connecting section, the free end of the first connecting section extends and is limited in the connecting cavity, the end face of the long rod is abutted to the end face of the floating core head, and the contact acting force between the copper pipe blank and the head is transmitted to the long rod when the copper pipe blank is stretched and molded.
Further, the spinning die comprises a ball, a gasket and two spinning rings, the gasket is located between the two spinning rings, one side of the spinning rings, which is arranged oppositely, is spliced with the gasket to form an arc-shaped annular groove, a plurality of balls are arranged and are in rolling connection with the annular groove, and the balls are matched with the threaded core head.
Further, still include drive assembly, drive assembly includes worm wheel and the worm of intermeshing setting, the axis direction of worm perpendicular to the axis direction setting of casing, the casing middle part is provided with annular assembly groove, the worm wheel sets up in the assembly groove, just the outer face of outer sleeve is provided with the external screw thread, the interior face of worm wheel is provided with the internal screw thread, the external screw thread with the internal screw thread meshes the setting mutually.
The invention also provides a rapid start-up copper pipe internal thread forming method, which comprises the following steps:
Providing a copper pipe blank, arranging a mold core assembly in the copper pipe blank, manufacturing a head at one end of the copper pipe blank, and feeding the copper pipe blank into a forming assembly, so that the copper pipe blank sequentially passes through a pre-reducing mold, a rotating mold, a pre-reducing mold and a sizing mold for stretch forming;
The copper pipe blank moves towards one side of the sizing die with the die core assembly under the action of stretch forming, the outer sleeve moves towards one side far away from the inner sleeve, and the inner sleeve floats along the axial direction of the inner sleeve under the elastic abutting action of the elastic piece and the stretch forming action of the copper pipe blank;
When the outer sleeve moves to the limit position, the floating core head moves to be matched with the reducing die along with the core rod, and the inner sleeve moves towards one side of the outer sleeve under the stretching forming action of the copper pipe blank;
when the inner sleeve moves to the position that the step surface is abutted against the outer end surface of the shell, the inner sleeve moves to the limit position, and the mold core assembly moves to the set position at the moment, so that the floating core head is matched with the reducing mold, and the threaded core head is matched with the spinning mold;
the relative positions of the outer sleeve and the inner sleeve are limited through the fastening piece, so that the copper pipe blank is stretched and molded under the matching action of the molding assembly and the mold core assembly, and a finished copper pipe is obtained.
The beneficial effects of the invention are as follows: according to the invention, by arranging the additional positioning assembly, the mold core assembly can be rapidly and accurately positioned through the cooperation effect among the outer sleeve, the inner sleeve and the elastic piece, the threaded core head on the core rod can move along with the pultrusion effect of the copper pipe blank through the floating effect of the inner sleeve, so that the relative position between the mold core assembly and the forming assembly is primarily determined, and the mold core assembly can move to the set position once through the further moving effect of the inner sleeve, so that the overall production efficiency of the internal threaded copper pipe is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of a rapid start copper tube internal thread forming apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the location of a mold core assembly and a molding assembly in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a structure of a housing according to an embodiment of the present invention;
FIG. 4 is a schematic view of an outer sleeve according to an embodiment of the present invention;
FIG. 5 is a schematic view of an inner sleeve according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a die core assembly according to an embodiment of the present invention;
fig. 7 is a side view of a quick start copper tube internal thread forming apparatus in accordance with an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken at A-A of FIG. 7;
FIG. 9 is a cross-sectional view at B-B in FIG. 7 of the positioning assembly in an initial state in accordance with an embodiment of the present invention;
FIG. 10 is a cross-sectional view at B-B in FIG. 7 of the positioning assembly in a first intermediate state in accordance with an embodiment of the present invention;
FIG. 11 is a cross-sectional view at B-B in FIG. 7 of the positioning assembly in a second intermediate state in accordance with an embodiment of the present invention;
FIG. 12 is a cross-sectional view of the positioning assembly at B-B of FIG. 7 in an operative state in accordance with an embodiment of the present invention;
FIG. 13 is a schematic view of a first nut according to an embodiment of the present invention;
FIG. 14 is a schematic view showing the structure of a spinning die according to an embodiment of the present invention;
Fig. 15 is a front view of a quick start copper tube internal thread forming apparatus in accordance with an embodiment of the present invention;
fig. 16 is a cross-sectional view at C-C in fig. 15.
Reference numerals: 01. copper pipe blank; 10. a molding assembly; 10a, an arc-shaped surface; 11. pre-reducing die; 12. reducing die; 13. a spinning die, 131, a ball; 132. a gasket; 133. a spinning ring; 134. a circumferential groove; 14. pre-sizing the die; 15. sizing die; 20. a mold core assembly; 21. a core bar; 211. an extension section; 212. a first connection section; 213. a second connection section; 214. a first nut; 214a, a head; 214b, a long stem; 214c, a connecting cavity; 215. a second nut; 22. a floating core print; 23. a threaded core head; 30. a positioning assembly; 31. a housing, 31a, and a connection groove; 31b, a first keyway; 31c, an assembly groove; 32. an outer sleeve; 32a, external threads; 321. a first positioning key; 33. an inner sleeve; 33a, step surfaces; 33b, grooves; 33c, a second keyway; 331. a stop block; 332. a connecting piece; 34. an elastic member; 35. a first die sleeve; 36. a second die sleeve; 361. a connection port; 37. a top connection cylinder; 371. a second positioning key; 38. a fastener; 40. a drive assembly; 41. a turbine; 41a, internal threads; 42. a worm.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The quick start copper pipe internal thread forming device as shown in fig. 1 to 16 comprises: a forming assembly 10, a core assembly 20, and a positioning assembly 30;
the forming assembly 10 comprises a pre-reducing die 11, a reducing die 12, a rotating die 13, a pre-sizing die 14 and a sizing die 15 which are arranged along the feeding direction of the copper pipe blank 01, and the copper pipe blank 01 is subjected to stretch forming through the pre-reducing die 11, the reducing die 12, the rotating die 13, the pre-sizing die 14 and the sizing die 15 in sequence;
the mold core assembly 20 comprises a core bar 21, a floating core head 22 and a threaded core head 23, wherein the core bar 21 is positioned in the copper pipe blank 01, and the floating core head 22 and the threaded core head 23 are sleeved on the core bar 21;
The positioning assembly 30 comprises a shell 31, an outer sleeve 32, an inner sleeve 33 and an elastic piece 34, wherein the outer sleeve 32 is arranged in the shell 31, one end of the inner sleeve 33 extends into the outer sleeve 32, the other end forms a step surface 33a and is in abutting joint with the outer end surface of the shell 31, the elastic piece 34 is sleeved on the outer side surface of the inner sleeve 33, one end of the elastic piece 34 is in abutting joint with the step surface 33a, and the other end of the elastic piece 34 is in abutting joint with the end surface of the outer sleeve 32 facing the inner sleeve 33; the pre-reducing die 11 is arranged at one end of the inner sleeve 33 facing the outside of the shell 31, and the reducing die 12 is arranged at one end of the inner sleeve 33 facing the inside of the shell 31;
The copper pipe blank 01 drives the mold core assembly 20 to move towards one side where the sizing mold 15 is located under the action of stretch forming, the outer sleeve 32 moves towards one side far away from the inner sleeve 33 in the shell 31, and the elastic piece 34 forms elastic acting force on the step surface 33a of the inner sleeve 33, so that the inner sleeve 33 floats along the axial direction of the inner sleeve 33 under the elastic abutting action of the elastic piece 34 and the stretch forming action of the copper pipe blank 01;
When the outer sleeve 32 moves to the limit position, the floating core 22 is matched with the reducing die 12, and the inner sleeve 33 moves towards one side of the outer sleeve 32 under the stretching forming effect of the copper pipe blank 01;
when the inner sleeve 33 is moved to the abutment of the stepped surface 33a with the outer end surface of the shell 31, the inner sleeve 33 is moved to the extreme position, and the core assembly 20 is moved to the set position such that the floating core 22 is engaged with the reducing die 12 and the threaded core 23 is engaged with the spinning die 13.
According to the invention, by arranging the additional positioning assembly 30, the mold core assembly 20 can be rapidly and accurately positioned through the cooperation among the outer sleeve 32, the inner sleeve 33 and the elastic piece 34, the threaded core head 23 on the core rod 21 can move along with the pultrusion action of the copper pipe blank 01 through the floating action of the inner sleeve 33, so that the relative position between the mold core assembly 20 and the forming assembly 10 is primarily determined, and the mold core assembly 20 can move to the set position once through the further movement action of the inner sleeve 33, so that the overall production efficiency of the copper pipe with the internal threads 41a is ensured.
It should be noted that, the positioning assembly 30 in the present invention is capable of feeding the mold core assembly 20 into the corresponding position in the forming assembly 10 twice along with the stretch forming action of the copper tube blank 01, and the relative positions of the inner sleeve 33, the outer sleeve 32 and the elastic member 34 may be changed in the whole process.
In the initial state, the worker sets the die core assembly 20 inside the copper pipe blank 01 and makes a head on one end of the copper pipe blank 01 so that the die core assembly 20 does not come out from the end of the copper pipe blank 01, at this time, the copper pipe blank 01 provided with the die core assembly 20 is fed into the forming assembly 10, the copper pipe blank 01 can move with the die core assembly 20 inside, and the copper pipe blank 01 is drawn and formed through the pre-reducing die 11, the reducing die 12, the spinning die 13, the pre-sizing die 14 and the sizing die 15 in this order.
Since the elastic member 34 is sleeved on the outer axial surface of the inner sleeve 33, and the two ends are abutted against the outer sleeve 32 and the inner sleeve 33, as the copper pipe blank 01 drives the die core assembly 20 to move towards the sizing die 15 under the action of stretch forming, the elastic member 34 forms elastic acting force on the step surface 33a of the inner sleeve 33, as the outer sleeve 32 moves towards the side far away from the inner sleeve 33 under the action of external driving, as the pre-reducing die 11 and the reducing die 12 are arranged at the two ends of the inner sleeve 33, as the copper pipe blank 01 stretches and forms a dynamic balance, the elastic acting force of the elastic member 34 on the inner sleeve 33 and the acting force transferred to the inner sleeve 33 by the stretch forming action of the copper pipe blank 01 float along the axial direction, and the inner sleeve 33 is in a first intermediate state.
When the outer sleeve 32 moves to the limit position, the floating core 22 moves to the position matching with the reducing die 12 along with the floating of the inner sleeve 33 and the stretch forming action of the copper pipe blank 01, at this time, the copper pipe blank 01 is subjected to the matching action of the floating core 22 and the reducing die 12, so that the floating core 22 is difficult to continue to move along with the copper pipe blank 01, and then the inner sleeve 33, the pre-reducing die 11, the reducing die 12, the copper pipe blank 01 and the die core assembly 20 are driven to move towards one side of the outer sleeve 32 under the abutting action of the elastic piece 34 against the abutting action of the elastic piece 34 under the stretch forming action of the copper pipe blank 01, and enter a second intermediate state.
When the inner sleeve 33 moves to the abutment of the step surface 33a and the outer end surface of the shell 31, the inner sleeve 33 moves to the limit position, at this time, the mold core assembly 20 moves to the set position, so that the floating core 22 is matched with the reducing mold 12, the threaded core 23 is matched with the spinning mold 13, at this time, the relative positions of the outer sleeve 32 and the inner sleeve 33 can be limited by the fastener 38, so that the positioning assembly 30 is kept in the working state, the mold core assembly 20 is kept at the set position, and in the whole process, the mold core assembly 20 can move to the set position at one time without repeatedly stopping to observe the internal state of the copper pipe blank 01, thereby ensuring the whole production efficiency of the copper pipe with the internal threads 41 a.
On the basis of the embodiment, the arc-shaped surface 10a is formed on one side of the pre-reducing die 11, the reducing die 12, the pre-reducing die 14 and the sizing die 15 facing the feeding direction of the copper pipe blank 01, so that the diameter of the copper pipe blank 01 is gradually reduced when passing through the arc-shaped surface 10 a; by the guiding action of the arc-shaped surface 10a, the surface quality of the copper pipe blank 01 after being stretched and molded is ensured under the matching action of the mold core assembly 20.
It should be noted that, the copper pipe blank 01 is subjected to the steps of twice reducing, forming the internal thread 41a and twice sizing, so as to obtain the finished copper pipe with the small-diameter internal thread 41a, and the die core assembly 20 is fed into the set position at one time along with the stretch forming action in the whole process, so that the subsequent stretch forming process can be automatically completed, the process flow is simplified, and the production efficiency is further improved.
On the basis of the above embodiment, the first die sleeve 35 and the second die sleeve 36 which are arranged corresponding to the pre-reducing die 11 and the reducing die 12 are respectively arranged at the two ends of the inner sleeve 33, the first die sleeve 35 and the second die sleeve 36 enable the pre-reducing die 11 and the reducing die 12 to be respectively connected with the inner sleeve 33, the inner sleeve 33 is internally provided with the propping cylinder 37, and the two end surfaces of the propping cylinder 37 are respectively propped against the end surfaces which are oppositely arranged with the first die sleeve 35 and the second die sleeve 36; the positions of the pre-reducing die 11 and the reducing die 12 are limited through the jacking cylinder 37, the first die sleeve 35 and the second die sleeve 36, so that the relative positions of the pre-reducing die 11 and the reducing die 12 and the inner sleeve 33 are prevented from being changed in the floating and moving processes of the inner sleeve 33, the accuracy of the positions is ensured, and the forming quality of products is further ensured.
On the basis of the above embodiment, the connecting grooves 31a are formed in the housing 31, the outer sleeve 32 and the inner sleeve 33, the connecting ports 361 are formed in the positions of the second die sleeve 36 opposite to the connecting grooves 31a, and a fastener 38 sequentially passes through the connecting grooves 31a of the housing 31, the outer sleeve 32 and the inner sleeve 33 and is connected with the connecting ports 361 on the second die sleeve 36; the relative positions of the outer sleeve 32 and the inner sleeve 33 can be observed from the outside through the positions of the connecting groove 31a and the connecting port 361, so that the state of the current positioning assembly 30 is confirmed, and when the positioning assembly 30 is in a working state, the relative positions of the outer sleeve 32, the inner sleeve 33 and the second die sleeve 36 can be limited through the fastener 38, so that the stability of the stretch forming quality of the copper pipe blank 01 is ensured.
On the basis of the above embodiment, two pairs of the stoppers 331 and the connecting pieces 332 are arranged on the inner sleeve 33, the end surface of the inner sleeve 33 at one end outside the shell 31 is concave to form a groove 33b communicated with the inner sleeve 33, the bottom of the groove 33b and the end surface of the first die sleeve 35 facing away from the second die sleeve 36 are positioned on the same plane, the two stoppers 331 are symmetrically arranged at the bottom of the groove 33b through the corresponding connecting pieces 332, and the stoppers 331 and the first die sleeve 35 form partial abutting action; the inner sleeve 33 is of a hollow structure, one end of the second die sleeve 36 can form a limiting effect on the second die sleeve 36, and when the die sleeve is assembled, the second die sleeve 36, the jacking cylinder 37 and the first die sleeve 35 can be sequentially fed into the inner sleeve 33 from one end of the groove 33b, the end part of the first die sleeve 35 is limited through the two pairs of stop blocks 331 and the connecting piece 332, the first die sleeve 35 is prevented from being separated from the inner sleeve 33, and the relative positions of the pre-reducing die 11 and the reducing die 12 are ensured.
On the basis of the above embodiment, the inner side wall of the housing 31 is provided with the first key groove 31b along the axial direction, the side of the outer sleeve 32 facing the housing 31 is provided with the first positioning key 321 corresponding to the first key groove 31b, and the first positioning key 321 is fixed on the side of the outer sleeve 32 away from the inner sleeve 33; the inner side wall of the inner sleeve 33 is provided with a second key groove 33c along the axial direction, one side of the propping cylinder 37 facing the inner sleeve 33 is provided with a second positioning key 371 corresponding to the second key groove 33c, and the second positioning key 371 is fixed on one side of the propping cylinder 37 close to the pre-reducing die 11; through the cooperation of the first key groove 31b and the first positioning key 321, the outer sleeve is prevented from rotating relative to the shell 31 in the moving process, and has a certain guiding function in the moving process, so that the stability and the accuracy of positioning are ensured; similarly, the abutting cylinder 37 is prevented from rotating relative to the inner sleeve 33 in the stretch forming process of the copper pipe blank 01 by the cooperation of the second key groove 33c and the second positioning key 371, so that the stretch forming quality is ensured.
On the basis of the above embodiment, the core rod 21 is in a split structure, and includes an extension section 211, a first connection section 212 and a second connection section 213, the first connection section 212 and the second connection section 213 are respectively located at two ends of the extension section 211, the floating core 22 and the threaded core 23 are respectively sleeved on the first connection section 212 and the second connection section 213, and the free ends of the first connection section 212 and the second connection section 213 are respectively screwed through a first nut 214 and a second nut 215 to limit the floating core 22 and the threaded core 23;
The first nut 214 includes a head 214a and a long rod 214b, the long rod 214b forms a connecting cavity 214c towards one end of the first connecting section 212, the free end of the first connecting section 212 extends, and is limited in the connecting cavity 214c, the end face of the long rod 214b is abutted against the end face of the floating core 22, and the contact force between the copper pipe blank 01 and the head 214a is transmitted to the long rod 214b when the copper pipe blank is stretched and molded; by providing the first nut 214 with a structure having a long stem portion 214b, the copper pipe blank 01 is first contacted with the head portion 214a of the first nut 214 before passing through the reducing die 12 and the floating core 22, and the long stem portion 214b provided between the floating core 22 and the head portion is connected with the core rod, so that the acting force in the stretching process is directly transferred to the long stem portion 214b and is transferred to the core rod as a whole through the long stem portion 214b, thereby avoiding the direct transfer of the acting force to the floating core 22, ensuring the stability of the fit between the floating core 22 and the reducing die 12, and ensuring the molding quality.
It should be noted that, the step structure is provided on the core rod 21, so that the floating core 22 and the threaded core 23 can respectively define positions thereof under the connection effect of the first nut 214 and the second nut 215, so as to prevent the floating core 22 and the threaded core 23 from sliding relatively on the core rod 21, and ensure the positioning accuracy.
When the copper pipe blank 01 is fed into the forming device of the quick start type copper pipe internal thread 41a, the copper pipe blank 01 is in a winding state initially, so that the copper pipe blank 01 has a certain bending radian when being unreeled initially, and the floating core 22 is easy to shake relatively when passing through the reducing die 12, so that the matching relation between the reducing die 12 and the floating core 22 is influenced, and the forming quality is difficult to ensure; the contact section between the head 214a and the inner side wall of the copper pipe blank 01 is set to be elliptical, the elliptical head 214a supports the bent copper pipe blank 01 for a certain space, the bending radian of the copper pipe blank 01 is corrected, the section of the copper pipe blank 01 is shaped like an ellipse, then a circular section is formed when the copper pipe blank passes through the reducing die 12 and the floating core 22, and therefore the influence of the arc copper pipe blank 01 on the floating core is avoided, and the forming quality is ensured.
On the basis of the embodiment, the spinning die 13 comprises a ball 131, a gasket 132 and two spinning rings 133, the gasket 132 is positioned between the two spinning rings 133, one side of the spinning rings 133 opposite to the gasket 132 is spliced to form an arc-shaped annular groove 134, a plurality of balls 131 are arranged and are in rolling connection with the annular groove 134, and the balls 131 are matched with the threaded core head 23; through curved circumferential groove 134 spacing ball 131, form the space that supplies copper pipe blank 01 to pass between the ball 131, ball 131 forms the butt effect to copper pipe blank 01's lateral wall, and the screw thread structure's of the inside copper pipe blank 01 of being convenient for of cooperation screw thread core 23 formation, and spherical ball 131 can reduce screw thread core 23 external diameter and thread angle design, reduces screw thread structure's drawing resistance, guarantees shaping quality and shaping efficiency.
On the basis of the above embodiment, the drive assembly 40 is further included, the drive assembly 40 includes a worm wheel and a worm 42 which are meshed with each other, an axial direction of the worm 42 is perpendicular to an axial direction of the housing 31, a circumferential assembly groove 31c is formed in the middle of the housing 31, the worm wheel is arranged in the assembly groove 31c, an external thread 32a is formed on an outer axial surface of the outer sleeve 32, an internal thread 41a is formed on an inner axial surface of the worm wheel, and the external thread 32a is meshed with the internal thread 41 a; the movement process of the outer sleeve 32 can be controlled by controlling the rotation of the worm 42 through the engagement between the worm wheel 41 and the worm 42 and the engagement between the worm wheel 41 and the outer sleeve 32, which is simple, convenient and highly accurate, wherein the worm 42 can be driven by a motor or the like, and is not particularly limited herein.
The invention also provides a method for forming the quick start copper pipe internal thread 41a, which comprises the following steps:
providing a copper pipe blank 01, arranging a mold core assembly 20 in the copper pipe blank 01, manufacturing one end of the copper pipe blank 01, and feeding the copper pipe blank 01 into a forming assembly 10 so that the copper pipe blank 01 is sequentially subjected to stretch forming through a pre-reducing mold 11, a reducing mold 12, a spinning mold 13, a pre-sizing mold 14 and a sizing mold 15;
The copper pipe blank 01 moves towards the sizing die 15 with the die core assembly 20 under the stretch forming action, the outer sleeve 32 moves towards the side far away from the inner sleeve 33, and the inner sleeve 33 floats along the axial direction of the inner sleeve 33 under the elastic abutting action of the elastic piece 34 and the stretch forming action of the copper pipe blank 01;
When the outer sleeve 32 moves to the limit position, the floating core 22 moves to be matched with the reducing die 12 along with the core rod 21, and the inner sleeve 33 moves towards one side of the outer sleeve 32 under the stretch forming action of the copper pipe blank 01;
When the inner sleeve 33 moves to the abutment of the step surface 33a with the outer end surface of the shell 31, the inner sleeve 33 moves to the limit position, and at this time, the mold core assembly 20 moves to the set position, so that the floating core 22 is matched with the reducing mold 12, and the threaded core 23 is matched with the spinning die 13;
the relative positions of the outer sleeve 32 and the inner sleeve 33 are defined by fasteners 38 such that the copper tube blank 01 is stretch-formed under the cooperation of the forming assembly 10 and the core assembly 20 to obtain a finished copper tube.
The technical effects of the operation process of the above molding method are the same as those of the above embodiment, and will not be described here again.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. Quick start type copper pipe internal thread forming device, its characterized in that includes: the molding assembly, the mold core assembly and the positioning assembly;
the forming assembly comprises a pre-reducing die, a rotating die, a preset diameter die and a sizing die which are arranged along the feeding direction of the copper pipe blank, and the copper pipe blank sequentially passes through the pre-reducing die, the rotating die, the preset diameter die and the sizing die for stretch forming;
The die core assembly comprises a core bar, a floating core head and a threaded core head, wherein the core bar is positioned in the copper pipe blank, and the floating core head and the threaded core head are sleeved on the core bar;
The positioning assembly comprises a shell, an outer sleeve, an inner sleeve and an elastic piece, wherein the outer sleeve is arranged in the shell, one end of the inner sleeve extends into the outer sleeve, the other end of the inner sleeve forms a step surface and is in butt joint with the outer end surface of the shell, the elastic piece is sleeved on the outer side surface of the inner sleeve, one end of the elastic piece is in butt joint with the step surface, and the other end of the elastic piece is in butt joint with the end surface of the outer sleeve, which faces the inner sleeve; the pre-reducing die is arranged at one end of the inner sleeve facing the outside of the shell, and the reducing die is arranged at one end of the inner sleeve facing the inside of the shell;
The copper pipe blank drives the mold core assembly to move towards one side where the sizing mold is located under the action of stretch forming, the outer sleeve moves towards one side far away from the inner sleeve in the shell, and the elastic piece forms elastic acting force on the step surface of the inner sleeve, so that the inner sleeve floats along the axial direction of the inner sleeve under the elastic abutting action of the elastic piece and the stretch forming action of the copper pipe blank;
when the outer sleeve moves to the limit position, the floating core head is matched with the reducing die, and the inner sleeve moves towards one side of the outer sleeve under the stretching forming effect of the copper pipe blank;
When the inner sleeve moves to the position that the step surface is abutted against the outer end surface of the shell, the inner sleeve moves to the limit position, and the mold core assembly moves to the set position at the moment, so that the floating core head is matched with the reducing mold, and the threaded core head is matched with the spinning die;
The two ends of the inner sleeve are respectively provided with a first die sleeve and a second die sleeve which are arranged corresponding to the pre-reducing die and the reducing die, the first die sleeve and the second die sleeve enable the pre-reducing die and the reducing die to be respectively connected with the inner sleeve, a propping cylinder is arranged in the inner sleeve, and two end surfaces of the propping cylinder are respectively propped against end surfaces which are oppositely arranged with the first die sleeve and the second die sleeve;
The shell, the outer sleeve and the inner sleeve are respectively provided with a connecting groove, the relative positions of the second die sleeve and the connecting grooves are provided with connecting ports, and a fastener sequentially penetrates through the connecting grooves of the shell, the outer sleeve and the inner sleeve and is connected with the connecting ports on the second die sleeve.
2. The rapid start-up type copper pipe internal thread forming device according to claim 1, wherein one side of the pre-reducing die, the pre-reducing die and the sizing die facing the feeding direction of the copper pipe blank forms an arc surface, so that the diameter of the copper pipe blank is gradually reduced when passing through the arc surface.
3. The quick start copper pipe internal thread forming device according to claim 1, wherein two pairs of stop blocks and connecting pieces are arranged on the inner sleeve, the end face of the inner sleeve, which is positioned at one end outside the shell, is concave to form a groove communicated with the inner sleeve, the groove bottom of the groove and the end face of the first die sleeve, which is away from the second die sleeve, are positioned on the same plane, the two stop blocks are symmetrically arranged at the groove bottom of the groove through the corresponding connecting pieces, and the stop blocks and the first die sleeve form partial abutting action.
4. The rapid start type copper pipe internal thread forming device according to claim 3, wherein a first key groove is formed in the inner side wall of the shell along the axial direction, a first positioning key corresponding to the first key groove is arranged on one side of the outer sleeve facing the shell, and the first positioning key is fixed on one side of the outer sleeve far away from the inner sleeve; the inner sleeve is characterized in that a second key groove is formed in the inner side wall of the inner sleeve along the axial direction, a second positioning key corresponding to the second key groove is arranged on one side of the propping cylinder facing the inner sleeve, and the second positioning key is fixed on one side, close to the pre-reducing die, of the propping cylinder.
5. The quick start copper pipe internal thread forming device according to claim 1, wherein the core rod is of a split structure and comprises an extension section, a first connecting section and a second connecting section, the first connecting section and the second connecting section are respectively positioned at two ends of the extension section, the floating core head and the threaded core head are respectively sleeved on the first connecting section and the second connecting section, and free ends of the first connecting section and the second connecting section are respectively connected through a first nut and a second nut in a threaded manner, so that the floating core head and the threaded core head are limited;
The first nut comprises a head and a long rod, a connecting cavity is formed at one end of the long rod facing the first connecting section, the free end of the first connecting section extends and is limited in the connecting cavity, the end face of the long rod is abutted to the end face of the floating core head, and the contact acting force between the copper pipe blank and the head is transmitted to the long rod when the copper pipe blank is stretched and molded.
6. The rapid start copper pipe internal thread forming device according to claim 1, wherein the spinning die comprises a ball, a gasket and two spinning rings, the gasket is located between the two spinning rings, one side of the spinning rings, which is arranged oppositely, is spliced with the gasket to form an arc-shaped annular groove, a plurality of balls are arranged and are in rolling connection with the annular groove, and the balls are matched with the thread core head.
7. The rapid start copper pipe internal thread forming device according to claim 1, further comprising a driving assembly, wherein the driving assembly comprises a worm wheel and a worm which are meshed with each other, the axis direction of the worm is perpendicular to the axis direction of the shell, a circumferential assembly groove is formed in the middle of the shell, the worm wheel is arranged in the assembly groove, an external thread is arranged on the outer shaft surface of the outer sleeve, an internal thread is arranged on the inner shaft surface of the worm wheel, and the external thread is meshed with the internal thread.
8. A method for forming internal threads of a quick start copper pipe, which is applied to the quick start copper pipe internal thread forming device as set forth in any one of claims 1 to 7, and is characterized by comprising the following steps:
Providing a copper pipe blank, arranging a mold core assembly in the copper pipe blank, manufacturing a head at one end of the copper pipe blank, and feeding the copper pipe blank into a forming assembly, so that the copper pipe blank sequentially passes through a pre-reducing mold, a rotating mold, a pre-reducing mold and a sizing mold for stretch forming;
The copper pipe blank moves towards one side of the sizing die with the die core assembly under the action of stretch forming, the outer sleeve moves towards one side far away from the inner sleeve, and the inner sleeve floats along the axial direction of the inner sleeve under the elastic abutting action of the elastic piece and the stretch forming action of the copper pipe blank;
When the outer sleeve moves to the limit position, the floating core head moves to be matched with the reducing die along with the core rod, and the inner sleeve moves towards one side of the outer sleeve under the stretching forming action of the copper pipe blank;
when the inner sleeve moves to the position that the step surface is abutted against the outer end surface of the shell, the inner sleeve moves to the limit position, and the mold core assembly moves to the set position at the moment, so that the floating core head is matched with the reducing mold, and the threaded core head is matched with the spinning mold;
the relative positions of the outer sleeve and the inner sleeve are limited through the fastening piece, so that the copper pipe blank is stretched and molded under the matching action of the molding assembly and the mold core assembly, and a finished copper pipe is obtained.
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| CN106607472A (en) * | 2016-11-24 | 2017-05-03 | 浙江耐乐铜业有限公司 | Copper pipe internal thread forming device |
| CN113059098A (en) * | 2021-03-15 | 2021-07-02 | 西安交通大学 | A kind of internal thread rolling plastic forming device and method |
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| GB1411845A (en) * | 1973-03-06 | 1975-10-29 | Automotive Prod Co Ltd | Couplings for pipes tubes hoses and like conduits |
| GB2231931B (en) * | 1989-05-16 | 1992-10-21 | Victaulic Plc | Pipe couplings |
| JP4550226B2 (en) * | 2000-06-06 | 2010-09-22 | 古河電気工業株式会社 | Internal grooved pipe manufacturing equipment |
| CN203737779U (en) * | 2014-03-17 | 2014-07-30 | 江苏兴荣美乐铜业有限公司 | High-speed synchronous type core bar device |
| US10267349B2 (en) * | 2016-06-21 | 2019-04-23 | Paul Kristen, Inc. | Fastener |
| CN208495565U (en) * | 2018-07-11 | 2019-02-15 | 广东海亮铜业有限公司 | A kind of mold and processing unit (plant) for processing round tube internal screw thread |
| CN113070375B (en) * | 2021-03-25 | 2022-11-15 | 江西耐乐铜业有限公司 | Copper pipe internal thread forming and adjusting system |
| CN217529087U (en) * | 2022-07-04 | 2022-10-04 | 新乡龙鑫精密模具制造有限公司 | Novel internal thread core print for copper pipe die |
| CN115805278A (en) * | 2022-12-05 | 2023-03-17 | 亚太轻合金(南通)科技有限公司 | Inner core is used in production of internal thread aluminum pipe |
| CN219074247U (en) * | 2022-12-27 | 2023-05-26 | 福建紫金铜业有限公司 | Core head positioning device for forming internal thread copper pipe |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106607472A (en) * | 2016-11-24 | 2017-05-03 | 浙江耐乐铜业有限公司 | Copper pipe internal thread forming device |
| CN113059098A (en) * | 2021-03-15 | 2021-07-02 | 西安交通大学 | A kind of internal thread rolling plastic forming device and method |
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