CN115870382A - Extrusion expansion grooved tube expansion head and grooved tube processing method - Google Patents
Extrusion expansion grooved tube expansion head and grooved tube processing method Download PDFInfo
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- CN115870382A CN115870382A CN202211708406.6A CN202211708406A CN115870382A CN 115870382 A CN115870382 A CN 115870382A CN 202211708406 A CN202211708406 A CN 202211708406A CN 115870382 A CN115870382 A CN 115870382A
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Abstract
The invention relates to an extrusion expansion grooved tube expansion head and a grooved tube processing method, wherein the extrusion expansion grooved tube expansion head comprises an extrusion expansion part and a connecting part; the extruding and expanding part is in a circular truncated cone shape, and a plurality of extruding and expanding teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the circular truncated cone; the extruding and expanding teeth extend from the upper bottom of the circular truncated cone to the lower bottom of the circular truncated cone, and the extruding and expanding teeth and the axis of the circular truncated cone are positioned on the same plane; the diameter of the upper bottom of the circular truncated cone is smaller than the inner diameter of the groove pipe, and the diameter of the lower bottom of the circular truncated cone is larger than the inner diameter of the groove pipe; the connecting part and the extrusion expansion part are coaxially arranged, one end of the connecting part is used for being connected to the expansion rod, and the other end of the connecting part is connected to the bottom of the extrusion expansion part round table. The extruding and expanding teeth are in contact with the inner wall of the metal light pipe and generate extruding and expanding, the extruding and expanding teeth which are uniformly distributed at intervals extrude and expand a plurality of grooves which are distributed at intervals in the inner wall of the metal light pipe, and finally, a plurality of sequentially spliced spine structures are formed among the grooves which are formed finally, and the spine structures form a micro-nano structure which can improve the phase change efficiency of working media, so that the performance of the heat pipe heat exchanger can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of processing of metal inner grooved pipes, and particularly relates to an extruded and expanded grooved pipe expansion head and a grooved pipe processing method.
Background
The industrial waste heat refers to heat releasable by heat carriers such as waste heat, waste water, waste gas and the like discharged in the production process of heat energy conversion equipment or energy utilization equipment in the industrial and mining industry, and belongs to low-grade energy. In the production process of traditional high-energy-consumption industries such as coal, petroleum, steel, chemical industry, machinery and the like, a large amount of industrial waste heat is generated and is regarded as the 5 th most common energy except for coal, petroleum, natural gas and water power. The potential of waste heat recovery to be excavated in China is very huge.
The heat pipe heat exchanger is often needed to be used in the field of waste heat recovery, but most of heat exchange pipes used by the heat pipe heat exchanger are light pipes, the heat exchange area is small, the performance is poor, the groove pipes obviously increase the heat exchange area, and the micro-nano structure between the grooves is beneficial to phase change of working media, so that the performance of the heat pipe heat exchanger is greatly improved.
The prior art discloses a slot pipe processingequipment, including the core that moves about and with the core cooperation that moves about is used for drawing the external mold of tubular product, the core that moves about has first drawing end and second and draws the end, first drawing end diameter is less than the second and draws the end, first drawing end with the second is drawn and is the round platform between the end, be equipped with on the round platform along circumference interval distribution and extend to first drawing is served and is held the recess. The moving core head plays a role of the inner die, the moving core head is matched with the outer die to draw the pipe, a groove is formed in the inner wall of the pipe in the drawing process, the pipe can be a grooved pipe through one-time drawing processing, and the processing time is reduced.
It has the following technical problems: the moving core head needs to be matched with an outer die for use, diameter reduction treatment needs to be carried out in the machining process, the working procedure is complicated, micro-nano structures cannot be machined among the grooves, and the phase change efficiency of the working medium and the performance of the heat pipe heat exchanger are difficult to further improve.
Disclosure of Invention
Aiming at the technical problems in the prior art, one of the purposes of the invention is as follows: the expansion head of the expansion groove pipe can be used for extruding and expanding the groove pipe at one time, and a micro-nano structure is processed between the grooves, so that the phase change efficiency of a working medium is improved, and the performance of a heat pipe heat exchanger is improved.
Aiming at the technical problems in the prior art, the second purpose of the invention is as follows: the groove pipe processing method is capable of extruding and forming the groove pipe at one time and processing micro-nano structures among the grooves.
The purpose of the invention is realized by the following technical scheme:
an expansion head of an extruded and expanded grooved pipe comprises an extrusion and expansion part and a connecting part;
the extrusion expansion part is in a round table shape, and a plurality of extrusion expansion teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the round table;
the extruding and expanding teeth extend from the upper bottom of the circular truncated cone to the lower bottom of the circular truncated cone, and the extruding and expanding teeth and the axis of the circular truncated cone are positioned on the same plane;
the diameter of the upper bottom of the circular truncated cone is smaller than the inner diameter of the groove pipe, and the diameter of the lower bottom of the circular truncated cone is larger than the inner diameter of the groove pipe;
the connecting part and the extrusion expansion part are coaxially arranged, one end of the connecting part is used for being connected to the expansion rod, and the other end of the connecting part is connected to the lower bottom of the circular table of the extrusion expansion part.
Furthermore, the front end of the extrusion expansion part is provided with a frustum-shaped guide part which is connected to the upper bottom of the circular truncated cone and is coaxially arranged with the extrusion expansion part.
Furthermore, an included angle of 30-60 degrees is formed between the side wall of the guide part and the axis of the extrusion expansion part.
Furthermore, the difference between the diameter of the lower bottom of the circular truncated cone and the inner diameter of the groove pipe is 0.1-0.3mm.
Furthermore, the number of the extruding expansion teeth is 30-180.
Furthermore, the height of the extruding expansion teeth is 0.1-0.2mm.
Furthermore, the extruding expansion teeth are provided with arc tooth tops, and the included angle of the arc tooth tops is 20-40 degrees.
Further, the squish was made from chrome tungsten manganese steel, 440c, or 4cr 13.
Further, the connecting portion is screwed to the swelling portion.
A method for processing a grooved tube adopts an expansion head of an extruded and expanded grooved tube, which comprises the following steps,
fixing a metal light pipe to be processed to coincide with the axis of the expansion rod, installing the expansion head on the expansion rod through a connecting part, driving the expansion head to do relative linear motion in the metal light pipe by using the expansion rod, along with the continuous feeding of the expansion rod, contacting the inner wall of the metal light pipe and generating extrusion expansion by the extrusion expansion teeth, extruding and expanding a plurality of grooves which are distributed at intervals in the inner wall of the metal light pipe by the extrusion expansion teeth which are distributed at even intervals, and forming a plurality of spine structures which are spliced in sequence among the grooves.
Compared with the prior art, the invention has the following beneficial effects:
when the expansion rod works, the metal light pipe to be added is fixed and is overlapped with the axis of the expansion rod. The expansion head is arranged on the expansion rod through the connecting part, and the pipe expander is started to push the expansion rod and the metal light pipe to move relatively. The extruding and expanding part of the expanding head is in a round table shape, the surface of the side wall of the round table is provided with a plurality of extruding and expanding teeth which are uniformly distributed at intervals, the diameter of the upper bottom of the round table is smaller than the inner diameter of the groove pipe, the diameter of the lower bottom of the round table is larger than the inner diameter of the groove pipe, the extruding and expanding teeth start to contact with the inner wall of the metal light pipe and generate extruding and expanding along with the continuous feeding of the expanding rod, the plurality of extruding and expanding teeth which are uniformly distributed at intervals extrude and expand a plurality of grooves which are distributed at intervals in the inner wall of the metal light pipe, and the axis of each groove is parallel to the axis of the expanding head. Due to the fact that the metal light pipe is extruded by the adjacent extruding and expanding teeth, and the outer portion of the metal light pipe is not limited by an outer die, a plurality of sequentially spliced pointed structures can be formed between the finally formed grooves, the pointed structures form micro-nano structures capable of improving phase change efficiency of working media, and therefore performance of the heat pipe heat exchanger can be effectively improved.
Drawings
Fig. 1 is a schematic structural view of an expansion head of an extruded grooved tube.
Fig. 2 is a schematic structural view of an expansion tooth of an expansion head of an expansion grooved tube.
Fig. 3 is a schematic view of the configuration of the bulge and the guide.
Fig. 4 is a schematic structural diagram of a connecting part of an expansion head of an extruded grooved tube.
FIG. 5 is a schematic structural diagram of a processed and formed spike structure of a trench tube.
Fig. 6 is a schematic view of the tube expansion process.
In the figure:
1-guide part, 2-extrusion part, 3-connecting part, 4-extrusion tooth, 5-internal thread, 6-tooth side wall, 7-arc tooth top, 8-groove, 9-spine structure and 10-metal light pipe.
Detailed Description
The present invention is described in further detail below.
As shown in fig. 1-5, an crowded groove pipe head that expands, including guide portion 1, crowded portion 2 and connecting portion 3 that expands, the equipartition has the crowded tooth 4 that expands of multirow on the crowded portion 2 that expands, and connecting portion 3 of the head that expands links together through internal thread 5 and the pole that expands, provides crowded effort for the head that expands.
Further, the guiding part 1 of the expansion head is in a frustum shape to ensure that the expansion head can smoothly enter the metal light pipe 10, meanwhile, centripetal positioning is provided, and the side wall of the frustum forms an included angle with the axis of the expansion head, wherein the angle is preferably 60 degrees.
Further, the diameter of the lower bottom of the circular truncated cone of the extrusion expansion part 2 of the expansion head is equivalent to the inner diameter of the metal light pipe 10 to be processed, and can also be slightly larger than the inner diameter of the metal light pipe 10 to realize the pipe expansion effect, and the pipe expansion allowance is preferably 0.2mm.
Further, a plurality of crowded bloated tooth 4 evenly distributed of head is on 2 round platform lateral wall surfaces of crowded bloated portion, and every crowded bloated tooth 4 all is in the coplanar with the head axis that expands, and crowded bloated tooth 4 preferred 90 of quantity.
Further, the height of the expansion tooth 4 of the expansion head is preferably 0.15mm, the structure of the expansion tooth 4 comprises a tooth side wall 6 and an arc tooth top 7, an included angle between the tooth side wall 6 and the symmetrical axis of the expansion tooth 4 is preferably 30 degrees, an included angle between the arc tooth top 7 is preferably 30 degrees, and during machining, the main stress part is the arc tooth top 7.
Further, the connecting portion 3 of the expander head is provided with an internal thread 5 to be connected to the expander rod for obtaining the extrusion thrust, and the length of the internal thread 5 is preferably 10mm to ensure that the expander head and the expander rod are coaxial.
Furthermore, the guide part 1 and the extrusion part 2 of the expansion head are made of chromium tungsten manganese steel with high hardness and wear resistance requirements. The material of the connecting part 3 is low, and high-speed steel is only needed. Both are welded together.
Further, the processing mode of the expansion head adopts linear cutting, the surface accuracy of the extrusion expansion part 2 and the guide part 1 is preferably Ra0.25, and the surface accuracy of the connecting part 3 is Ra3.2.
Further, a plurality of spine structures 9 arranged in sequence can be formed on two sides of the extruded groove 8, and when the groove 8 is used in the heat exchange field, the micro-nano structure formed by the spine structures 9 is beneficial to enhancing the heat exchange capacity.
As shown in fig. 6, a method for processing a grooved tube by using an expansion head for extruding and expanding the grooved tube comprises the following steps,
fixing a metal light pipe 10 to be processed to coincide with the axis of the expansion rod, mounting an expansion head on the expansion rod through a connecting part 3, driving the expansion head to do relative linear motion in the metal light pipe 10 by using the expansion rod, enabling the extruding and expanding teeth 4 to contact with the inner wall of the metal light pipe 10 and generate extruding and expanding along with the continuous feeding of the expansion rod, extruding and expanding a plurality of grooves 8 which are distributed at intervals in the inner wall of the metal light pipe 10 by a plurality of extruding and expanding teeth 4 which are distributed at intervals, and forming spine structures 9 which are spliced in sequence between the grooves 8.
Taking the processing of a copper light pipe as an example, the method specifically comprises the following steps:
(1) And intercepting the copper optical tube to be processed, and straightening and cleaning the copper optical tube.
(2) And one end of the copper optical tube is reamed so as to facilitate the entry of the expansion head, and the damage of the expansion head and the pipe fitting caused by collision with the pipe wall is avoided.
(3) And fixing the copper light pipe to ensure that the copper light pipe is overlapped with the axis of the expansion rod.
(4) And installing the expansion head on the expansion rod in a threaded fastening mode.
(5) And (4) coating lubricating oil.
(6) And starting the tube expander, pushing the expansion rod and the light tube to move relatively, observing the working state, extruding and expanding the expansion rod out of the grooves 8, and forming a plurality of spine structures 9 between the grooves 8 to obtain the processed copper groove 8 tube.
By adopting the processing method, an external mold does not need to be additionally configured, the processing process does not need to be subjected to reducing treatment, the micro-nano structure can be directly formed in an extruding and expanding mode at one time, the process is simple and convenient, the micro-nano structure can be processed between the grooves 8, the phase change efficiency of the working medium in the grooves 8 is effectively improved, and the performance of the heat pipe heat exchanger is improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a crowded inflation fluted tube expansion head which characterized in that: comprises an extrusion expansion part and a connecting part;
the extrusion expansion part is in a round table shape, and a plurality of extrusion expansion teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the round table;
the extruding and expanding teeth extend from the upper bottom of the circular truncated cone to the lower bottom of the circular truncated cone, and the extruding and expanding teeth and the axis of the circular truncated cone are positioned on the same plane;
the diameter of the upper bottom of the circular truncated cone is smaller than the inner diameter of the groove pipe, and the diameter of the lower bottom of the circular truncated cone is larger than the inner diameter of the groove pipe;
the connecting part and the extrusion expansion part are coaxially arranged, one end of the connecting part is used for being connected to the expansion rod, and the other end of the connecting part is connected to the lower bottom of the circular table of the extrusion expansion part.
2. An extruded fluted tube expander as defined in claim 1, wherein: the front end of the extrusion expansion part is provided with a frustum-shaped guide part which is connected to the upper bottom of the circular truncated cone and is coaxial with the extrusion expansion part.
3. An extruded fluted tube expander as defined in claim 2, wherein: the side wall of the guide part and the axis of the extrusion expansion part form an included angle of 30-60 degrees.
4. An extruded fluted tube expander as defined in claim 1, wherein: the difference between the diameter of the lower bottom of the circular truncated cone and the inner diameter of the groove pipe is 0.1-0.3mm.
5. An extruded fluted tube expander as defined in claim 1, wherein: the number of the extruding and expanding teeth is 30-180.
6. An extruded fluted tube expander as defined in claim 1, wherein: the height of the extruded and expanded teeth is 0.1-0.2mm.
7. An extruded fluted tube expander as defined in claim 1, wherein: the extruding expansion tooth is provided with an arc tooth top, and the included angle of the arc tooth top is 20-40 degrees.
8. An extruded fluted tube expander according to claim 1, wherein: the extrusions were made from chrome tungsten manganese steel, 440c or 4cr 13.
9. An extruded fluted tube expander as defined in claim 1, wherein: the connecting part is in threaded connection with the extrusion part.
10. A method for processing a groove pipe is characterized by comprising the following steps: use of an extrusion grooved tube expander as claimed in any one of claims 1 to 9 including the steps of,
fixing a metal light pipe to be processed to coincide with the axis of the expansion rod, installing the expansion head on the expansion rod through a connecting part, driving the expansion head to do relative linear motion in the metal light pipe by using the expansion rod, along with the continuous feeding of the expansion rod, contacting the inner wall of the metal light pipe and generating extrusion expansion by the extrusion expansion teeth, extruding and expanding a plurality of grooves which are distributed at intervals in the inner wall of the metal light pipe by the extrusion expansion teeth which are distributed at even intervals, and forming a plurality of spine structures which are spliced in sequence among the grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211708406.6A CN115870382A (en) | 2022-12-29 | 2022-12-29 | Extrusion expansion grooved tube expansion head and grooved tube processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211708406.6A CN115870382A (en) | 2022-12-29 | 2022-12-29 | Extrusion expansion grooved tube expansion head and grooved tube processing method |
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| Publication Number | Publication Date |
|---|---|
| CN115870382A true CN115870382A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211708406.6A Pending CN115870382A (en) | 2022-12-29 | 2022-12-29 | Extrusion expansion grooved tube expansion head and grooved tube processing method |
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| Country | Link |
|---|---|
| CN (1) | CN115870382A (en) |
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- 2022-12-29 CN CN202211708406.6A patent/CN115870382A/en active Pending
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