CN212703721U - Micro-miniature groove heat pipe extrusion die - Google Patents

Abstract

The utility model provides a micro-groove heat pipe extrusion die, which comprises a die core, a front die, a rear die body and a die pad, wherein the front die, the rear die body and the die pad are detachably connected in sequence; a welding chamber is arranged at the joint of the rear die body and the front die, a working belt communicated with the welding chamber is arranged on the rear die body, a blank cutter is arranged at the joint of the rear die body and the die pad, one end of the working belt far away from the welding chamber is communicated with one end of the blank cutter, and the other end of the blank cutter penetrates through the die core; the front die is provided with a mounting hole penetrating through the front die, and the mounting hole is communicated with the welding chamber; the mold core is suitable for being inserted into the mounting hole and detachably connected with the mounting hole, and one end, facing the mold pad, of the mold core extends into the working belt through the welding chamber. The utility model has the advantages that the mold core and the mounting hole are arranged, so that the mold core is easy to replace, and the later maintenance and replacement of the mold core are convenient; and, through setting up back mould body and die cushion, greatly reduced the processing degree of difficulty, the processing cost of back mould, shortened the manufacturing cycle of back mould.

Description

Micro-miniature groove heat pipe extrusion die

Technical Field

The utility model relates to the technical field of mechanical device, particularly, relate to a microminiature slot heat pipe extrusion die.

Background

The micro heat pipe is used as a high-efficiency heat transfer element and is widely applied in the thermal control fields of aerospace, solar energy and the like; for example, the micro heat pipe of the aluminum alloy micro channel heat pipe is a key element for solving the heat dissipation problem of high heat flux density components on spacecrafts such as satellites and the like in a space environment, and the groove microstructure of the liquid absorption core on the pipe shell is in a sub-millimeter scale, which provides a serious challenge for the processing and manufacturing of the pipe shell; heretofore, extrusion techniques, particularly split-flow hot extrusion, have been one of the primary forming processes for making heat pipe envelopes and other hollow shapes.

However, the existing extrusion die for producing and manufacturing the micro-groove heat pipe for the micro-heat pipe mostly has the problems of easy damage of a die core structure, complex die, difficult processing and the like, and the application of the extrusion in the field of manufacturing the heat pipe is severely restricted, and the problems are embodied in the following two aspects: firstly, the diameter of a mold core structure of the micro heat pipe is small, and the micro heat pipe is easy to damage due to the difference of strength and rigidity; the existing integrated mold core structure not only has high processing cost, but also can cause the scrapping of the whole mold after the mold core structure is damaged; secondly, the typical overall dimension of the micro heat pipe is usually below 4mm, which makes the depth-to-width ratio of the die hole structure of the micro groove heat pipe extrusion die very large, i.e. the cross section dimension of the die hole structure is small and the depth is large, which poses a serious challenge to the die processing.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem be: how to make the mold core easily replaced to and reduce the processing difficulty and the manufacturing cost of the mold.

In order to solve the problems, the utility model provides a micro-groove heat pipe extrusion die, which comprises a die core, a front die, a rear die body and a die pad, wherein the front die, the rear die body and the die pad are detachably connected in sequence; a welding chamber is arranged at the joint of the rear die body and the front die, a working belt communicated with the welding chamber is arranged on the rear die body, a blank cutter is arranged at the joint of the rear die body and the die pad, one end of the working belt, which is far away from the welding chamber, is communicated with one end of the blank cutter, and the other end of the blank cutter penetrates through the die core; the front die is provided with a mounting hole penetrating through the front die, and the mounting hole is communicated with the welding chamber; the mold core is suitable for being inserted into the mounting hole and detachably connected with the mounting hole, and one end, facing the mold pad, of the mold core extends into the working band through the welding chamber.

Optionally, the mold core comprises a positioning part, a connecting part and a shaping part, and the positioning part, the connecting part and the shaping part are sequentially connected in the direction from the front mold to the rear mold body; the mounting hole comprises a first accommodating hole and a second accommodating hole, the first accommodating hole is suitable for accommodating the positioning part, the second accommodating hole is suitable for accommodating the connecting part, and the hole wall of the first accommodating hole is suitable for limiting the positioning part to rotate around the axis of the positioning part; the connecting portion with the junction of design portion is located it is indoor to weld, just design portion is kept away from the one end of connecting portion extends to in the work band.

Optionally, the shaping portion and the working band are coaxially arranged, and an annular gap is formed between a side wall of one end of the shaping portion extending into the working band and an inner wall of the working band.

Optionally, the positioning portion, the connecting portion and the shaping portion are coaxially arranged, and the cross-sectional area of the connecting portion is larger than that of the shaping portion and smaller than that of the positioning portion.

Optionally, a prism structure and/or a groove structure are arranged on a side wall of one end of the shaping portion, which extends into the working belt, and an extending direction of the prism structure and/or the groove structure is parallel to an axis of the shaping portion.

Optionally, the blank cutter comprises a first blank cutter and a second blank cutter which are communicated, one end of the first blank cutter, which is far away from the second blank cutter, is communicated with the working belt, and one end of the second blank cutter, which is far away from the first blank cutter, penetrates through the die cushion and is communicated with the outside; and the cross sectional area of the first hollow cutter is larger than that of the working belt and smaller than that of the second hollow cutter.

Optionally, the welding chamber is arranged on one side of the rear die body facing the front die.

Optionally, a plurality of shunting holes penetrating through the front mold are formed in the front mold, and the plurality of shunting holes are communicated with the welding chamber and are arranged at intervals around the mounting hole.

Optionally, the front mold and the rear mold body are respectively provided with one of a positioning groove and a positioning table, and the positioning table is in plug-in fit with the positioning groove.

Optionally, micro-groove heat pipe extrusion die still includes the setting element, micro-groove heat pipe extrusion die is suitable for the assembly in the die holder of extruder, the setting element sets up on the lateral wall of back mould body, and/or, set up on the lateral wall of die cushion, be used for the restriction micro-groove heat pipe extrusion die is in wind rotate around micro-groove heat pipe extrusion die's axis in the die holder.

Compared with the prior art, the utility model, following beneficial effect has: the mold core and the mounting hole are arranged to realize the detachable connection of the mold core and the front mold, so that the mold core is easy to replace, on one hand, the mold core and the front mold are suitable for being manufactured and molded independently, the manufacturing difficulty and cost of the mold core and the front mold are reduced, and the later maintenance and replacement of the mold core are facilitated; on the other hand, the front die is suitable for assembling die cores of different specifications through the mounting holes so as to produce extruded products of different specifications, the application range of the micro-groove heat pipe extrusion die is expanded, and the use cost of the micro-groove heat pipe extrusion die is reduced. Through setting up the back mould body and the die pad of dismantling the connection to process corresponding hole cell type structure respectively on back mould body and die pad, so, for the back mould of integral type, the processing degree of difficulty, the processing cost of back mould have greatly been reduced to the back mould of disconnect-type (can dismantle back mould body and die pad of connection), the manufacturing cycle of back mould has been shortened, and make the hole cell type structure on back mould body and the die pad after the thickness attenuate easily process, and its processing technology can select relatively economy, efficient mills, processes such as the cutting of fast walking silk line, the manufacturing cost of back mould has further been reduced, thereby greatly reduced the processing degree of difficulty of microminiature slot heat pipe extrusion die, the processing cost, the manufacturing cycle of microminiature slot heat pipe extrusion die has been shortened.

Drawings

FIG. 1 is an exploded view of a micro-groove heat pipe extrusion mold according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an extrusion mold for a micro-groove heat pipe according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another view angle of the extrusion mold for a micro-grooved heat pipe according to an embodiment of the present invention;

3 FIG. 3 4 3 is 3 a 3 sectional 3 view 3 taken 3 at 3 A 3- 3 A 3 in 3 FIG. 33 3; 3

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

fig. 6 is a schematic structural view of another view angle of the extrusion die for a micro-groove heat pipe in the embodiment of the present invention;

fig. 7 is a sectional view at B-B in fig. 6.

Description of reference numerals:

1-front mould, 11-mounting hole, 111-first containing hole, 112-second containing hole, 12-shunting hole and 13-positioning table; 2-rear die, 21-rear die body, 22-die pad, 23-welding chamber, 24-working band, 25-blank cutter, 251-first blank cutter, 252-second blank cutter and 26-positioning groove; 3-mold core, 31-positioning part, 32-connecting part and 33-shaping part; 4-positioning piece.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

It should be noted that, in the coordinate axis X provided herein, the positive direction of the X axis represents the front direction, and the negative direction of the X axis represents the rear direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

With reference to fig. 1-7, an embodiment of the present invention provides a micro-groove heat pipe extrusion mold, which includes a mold core 3, and a front mold 1, a rear mold body 21 and a mold pad 22 detachably connected in sequence; a welding chamber 23 is arranged at the joint of the rear die body 21 and the front die 1, a working belt 24 communicated with the welding chamber 23 is arranged on the rear die body 21, a blank cutter 25 is arranged at the joint of the rear die body 21 and the die pad 22, one end of the working belt 24, which is far away from the welding chamber 23, is communicated with one end of the blank cutter 25, and the other end of the blank cutter 25 penetrates through the die core 3; the front die 1 is provided with a mounting hole 11 penetrating through the front die 1, and the mounting hole 11 is communicated with the welding chamber 23; the mold core 3 is adapted to be inserted into the mounting hole 11 and detachably connected to the mounting hole 11, and an end of the mold core 3 facing the mold pad 22 extends into the work belt 24 through the weld chamber 23.

The micro-groove heat pipe extrusion die comprises a front die 1 and a rear die 2 which are detachably connected, the rear die 2 comprises a rear die body 21 and a die pad 22 which are detachably connected, and the front die 1, the rear die body 21 and the die pad 22 are sequentially detachably connected in the X-axis direction in fig. 1 (for example, detachably connected through fasteners such as cylindrical pins) so as to facilitate the independent manufacturing and forming of the rear die body 21 and the die pad 22 of the front die 1 and the rear die 2. The welding chamber 23 is arranged at the joint of the front mold 1 and the rear mold body 21, the welding chamber 23 can be arranged on one side of the front mold 1 facing the rear mold body 21, the welding chamber 23 can be arranged on one side of the rear mold body 21 facing the front mold 1, and the welding chamber 23 can be arranged on both the front mold 1 and the rear mold body 21 (namely, the welding chamber 23 is enclosed when the front mold 1 and the rear mold body 21 are connected). The front die 1 is provided with a mounting hole 11 and a shunting hole 12 which penetrate through the front die 1, and the mounting hole 11 and the shunting hole 12 are both communicated with a welding chamber 23, wherein the mounting hole 11 is used for assembling the die core 3, and the shunting hole 12 is used for accommodating a plastically flowing blank (namely a material for producing an extruded product) and guiding the blank to the welding chamber 23; specifically, the front die 1 is provided with the shunting holes 12, and the shunting holes 12 are communicated with the welding chamber 23, so that the extruded blank on the side of the front die 1, which is far away from the rear die 2, can flow plastically through the shunting holes 12 and is gathered in the welding chamber 23. The working belt 24 and the blank cutter 25 are both in cylindrical hole structures and are used for communicating the welding chamber 23 with the outside (the outside of the micro-groove heat pipe extrusion die); specifically, the working tape 24 is disposed on the rear mold body 21 and communicated with the welding chamber 23, the blank cutter 25 is disposed at the joint of the rear mold body 21 and the mold pad 22, the blank cutter 25 may be disposed only on the mold pad 22, or the blank cutter 25 may be disposed on both the rear mold body 21 and the mold pad 22 (i.e., both ends of the blank cutter 25 extend to the rear mold body 21 and the mold pad 22, respectively); and the front end of the blank cutter 25 (i.e. the end of the blank cutter 25 located in the positive direction of the X axis in fig. 7) is communicated with one end of the working tape 24 far away from the welding chamber 23, and the rear end of the blank cutter 25 (i.e. the end of the blank cutter 25 located in the negative direction of the X axis in fig. 4) penetrates through the die pad 22 and is connected with the outside (outside of the micro-groove heat pipe extrusion die).

The rear end of the mold core 3 (i.e. the end of the mold core 3 facing the rear mold 2, and also the end of the mold core 3 located at the opposite direction of the X axis in fig. 1) extends into the working band 24, and the inner wall of the working band 24 and the side wall of the rear end of the mold core 3 enclose a channel with a certain shape (i.e. the shape of the cross section of the extruded product) for molding and shaping the extruded product; thus, after the blank flows into the welding chamber 23 through the diversion hole 12, the blank is continuously gathered in the welding chamber 23, and the static pressure applied to the blank is continuously increased, so that the blank is extruded and molded from the position between the rear end of the mold core 3 and the working belt 24 through the welding chamber 23, and is separated from the micro-groove heat pipe extrusion mold through the idle cutter 25, and finally an extruded product is obtained. Moreover, the mold core 3 is suitable for being inserted into a mounting hole 11 arranged on the front mold 1, and the mold core 3 and the mounting hole 11 are suitable for being in insertion fit (or clearance fit) so as to realize the assembly of the mold core 3 on the front mold 1, ensure the stability of the mold core 3 during the working operation of the micro-groove heat pipe extrusion mold and obtain an extruded product with composite requirements; moreover, the mold core 3 is detachably connected with the mounting hole 11, that is, the mold core 3 is detachably connected with the front mold 1, so that the mold core 3 is easy to replace.

The mold core 3 and the mounting hole 11 are arranged to realize the detachable connection of the mold core 3 and the front mold 1, so that the mold core 3 is easy to replace, on one hand, the mold core 3 and the front mold 1 are suitable for being manufactured and molded independently, the manufacturing difficulty and cost of the mold core 3 and the front mold 1 are reduced, and the later maintenance and replacement of the mold core 3 are facilitated; on the other hand, the front die 1 is suitable for assembling the die cores 3 with different specifications through the mounting holes 11 so as to produce extruded products with different specifications, the application range of the micro-groove heat pipe extrusion die is expanded, and the use cost of the micro-groove heat pipe extrusion die is reduced. Through the arrangement of the rear die body 21 and the die pad 22 which are detachably connected, corresponding hole groove type structures are respectively processed on the rear die body 21 and the die pad 22, so that compared with the integral rear die 2, the split rear die 2 (the rear die body 21 and the die pad 22 which are detachably connected) greatly reduces the processing difficulty and the processing cost of the rear die 2, the manufacturing period of the rear die 2 is shortened, the hole groove type structures on the rear die body 21 and the die pad 22 with reduced thickness are easy to process, and the processing technology can select relatively economical, efficient milling, fast wire cutting and other technologies, the manufacturing cost of the rear die 2 is further reduced, the processing difficulty and the processing cost of the micro-groove heat pipe extrusion die are greatly reduced, and the manufacturing period of the micro-groove heat pipe extrusion die is shortened.

In order to further understand the advantages of the micro-groove heat pipe extrusion mold provided by the present invention, the following description will be given by taking the micro-groove heat pipe extrusion mold applied to the production of the pipe shell of the micro-heat pipe as an example; the micro heat pipe is used as a high-efficiency heat transfer element and mainly comprises a pipe shell, a liquid absorption core and a working medium; compared with the traditional copper metal with excellent heat transfer performance, the micro heat pipe has the characteristics of high heat transfer coefficient, small thermal resistance, high thermal response speed and the like, and is widely applied to the thermal control fields of spaceflight, solar energy and the like. For example, the micro heat pipe of the aluminum alloy micro groove heat pipe is a key element for solving the heat dissipation problem of high heat flux density components on spacecrafts such as satellites and the like in a space environment, and the groove microstructure of the wick on the pipe shell is in a sub-millimeter scale (the typical size is 0.3mm), which provides a serious challenge for the processing and manufacturing of the pipe shell. So far, the extrusion technology, especially the shunting hot extrusion, is one of the main forming processes for manufacturing the tube shell of the micro heat pipe and other hollow sections, and has the advantages of high production efficiency, low cost, excellent product performance, near-net forming and the like; however, the existing extrusion die for producing and manufacturing the micro-groove heat pipe for the micro-heat pipe mostly has the problems of easy damage of a die core structure, complex die, difficult processing and the like, and the application of the extrusion in the field of manufacturing the heat pipe is severely restricted, and the problems are embodied in the following two aspects: firstly, the diameter of a mold core structure of the micro heat pipe is small, and the micro heat pipe is easy to damage due to the difference of strength and rigidity; the existing integrated mold core structure not only has high processing cost, but also can cause the scrapping of the whole mold after the mold core structure is damaged; secondly, the typical external dimension of the micro heat pipe is usually below 4mm, which makes the aspect ratio of the die hole structure (i.e. the mounting hole 11, the shunting hole 12, the working band 24, the hollow cutter 25, etc.) of the micro groove heat pipe extrusion die very large, i.e. the cross section of the die hole structure is small and deep, which poses a serious challenge to the die machining, the traditional milling process is difficult to meet the manufacturing requirement of the micro groove heat pipe extrusion die for producing and manufacturing the micro heat pipe, while the electrical discharge machining method widely adopted at present can greatly increase the production cost, so that the rear die 2 has the problems of difficult machining, high manufacturing cost and long manufacturing period. In order to solve the first problem, the utility model has the advantages that the mold core 3 and the front mold 1 which are detachably connected are arranged to realize the detachable connection of the mold core 3 and the front mold 1, so that the mold core 3 is easy to replace, the manufacturing difficulty and cost of the mold core 3 and the front mold 1 are reduced, the later maintenance and replacement of the mold core 3 are greatly facilitated, and the production and manufacturing cost of the pipe shell of the micro heat pipe is greatly reduced; to the above-mentioned problem two, the utility model discloses a set up the back mould 2 of disconnect-type design, can dismantle the back mould body 21 and the die cushion 22 of connection promptly through setting up, in order to process corresponding hole cell type structure (nib structure) respectively on back mould body 21 and die cushion 22, thus, with the processing degree of difficulty that reduces back mould 2, the processing cost, shorten the manufacturing cycle of back mould 2, and make hole cell type structure (nib structure) easily processing and its processing technology on back mould body 21 and the die cushion 22 after the thickness attenuate can select relative economy, the efficient mills, processes such as fast walk silk line cutting, the processing degree of difficulty and the manufacturing cost of back mould 2 have further been reduced, the manufacturing cycle of back mould 2 has further been shortened, thereby the manufacturing cost and the degree of difficulty of the miniature slot heat pipe extrusion die who is used for producing the miniature tube of making miniature heat pipe have been reduced. So, when the utility model discloses a miniature slot heat pipe extrusion die is applied to the production and makes miniature heat pipe (for example miniature slot heat pipe), can break through the technological bottleneck of the batch precision manufacturing of the pipe of miniature heat pipe among the prior art (be promptly above-mentioned problem one and problem two), improves the performance of the pipe of miniature heat pipe.

Optionally, as shown in fig. 1 to 5, the mold core 3 includes a positioning portion 31, a connecting portion 32 and a shaping portion 33, and the positioning portion 31, the connecting portion 32 and the shaping portion 33 are connected in sequence in a direction from the front mold 1 to the rear mold body 21; the mounting hole 11 includes a first receiving hole 111 adapted to receive the positioning portion 31 and a second receiving hole 112 adapted to receive the connecting portion 32, and a hole wall of the first receiving hole 111 is adapted to restrict the positioning portion 31 from rotating about an axis of the positioning portion 31; the connecting portion 32 and the fixing portion 33 are connected in the welding chamber 23, and one end of the fixing portion 33 away from the connecting portion 32 extends into the working tape 24.

In the direction from the front mold 1 to the rear mold body 21 (i.e. the direction of the X axis in fig. 1), the positioning portion 31, the connecting portion 32 and the shaping portion 33 of the mold core 3 are connected in sequence, and the positioning portion 31, the connecting portion 32 and the shaping portion 33 are preferably integrally formed, so as to improve the structural strength of the mold core 3, thereby improving the stability and reliability of the micro-groove heat pipe extrusion mold during operation. The mounting hole 11 comprises a first accommodating hole 111 and a first accommodating hole 112 which are communicated, one end, far away from the first accommodating hole 112, of the first accommodating hole 111 is communicated with the outside, so that the mold core 3 is inserted into the mounting hole 11 from the first accommodating hole 111 when the mold core 3 is mounted and replaced conveniently, and one end, far away from the first accommodating hole 111, of the first accommodating hole 112 is communicated with the welding chamber 23, so that the shaping part 33 is inserted into the working belt 24 through the welding chamber 23. The first accommodating hole 111 and the first accommodating hole 112 are respectively matched with the positioning part 31 and the connecting part 32 so as to ensure the stability when the mold core 3 is connected with the front mold 1; moreover, the hole wall of the first accommodating hole 111 is adapted to restrict the degree of freedom of the rotation of the mold core 3 about the axis thereof, that is, the hole wall of the first accommodating hole 111 is adapted to restrict the rotation of the positioning portion 31 about the axis of the positioning portion 31, so as to prevent the rotation of the mold core 3 about its own axis from affecting the molding of the extruded product, and further improve the stability of the connection of the mold core 3 with the front mold 1.

Further, the cross section of the positioning portion 31 (i.e. the exposed surface of the positioning portion 31 when being cut by a plane perpendicular to the axis of the mold core 3) is in a non-circular shape such as a polygon, an ellipse, a kidney, etc., and the first accommodating hole 111 is adapted to the shape of the positioning portion 31, so as to limit the rotation of the positioning portion 31 around the axis of the positioning portion 31 by the hole wall of the first accommodating hole 111.

Alternatively, as shown in fig. 1 to 7, the shaping portion 33 is disposed coaxially with the working tape 24, and an annular gap is formed between a side wall of one end of the shaping portion 33 extending into the working tape 24 and an inner wall of the working tape 24.

An annular gap is formed between a side wall (i.e. a side surface of the shaping part 33 facing the inner wall of the working tape 24) of one end (i.e. one end of the shaping part 33 far away from the connecting part 32 and also the rear end of the shaping part 33) of the shaping part 33 extending into the working tape 24 and the inner wall of the working tape 24, so that the inner wall of the working tape 24 and the side wall of the rear end (i.e. one end of the shaping part 33 located in the opposite direction of the X axis in fig. 1) of the shaping part 33 enclose an annular channel to produce a pipe-type extruded product (such as a micro-grooved heat pipe). And the axial line of the shaping part 33 and the axial line of the working band 24 are positioned on the same straight line, so as to ensure that the rear end of the shaping part 33 is stably positioned in the middle position of the working band 24, and to ensure that the thickness of the pipe wall of the pipe type extruded product produced by the micro-groove heat pipe extrusion die is uniform.

Further, the fixing portion 33 may have a columnar structure such as a cylindrical, elliptic cylindrical, or vertical columnar structure, the working tape 24 may have a columnar structure, and the fixing portion 33 and the working tape 24 may have the same or different columnar structures. In one embodiment of the present invention, the cross-section of the working belt 24 is in the shape of a rounded rectangle (i.e. the corners of the rectangle are rounded), on one hand, to facilitate the demolding of the extruded product; on the other hand, the working tape 24 on the rear die body 21 can be conveniently machined and formed (for example, by milling, wire cutting and the like).

Further, the gap between the side wall of the rear end of the shaping part 33 and the inner wall of the working band 24 can be in other shapes, so that the micro-groove heat pipe extrusion die is suitable for producing extruded products such as profiles.

Alternatively, as shown in fig. 1 to 7, the positioning portion 31, the connecting portion 32 and the shaping portion 33 are all coaxially disposed, and the cross-sectional area of the connecting portion 32 is larger than that of the shaping portion 33 and smaller than that of the positioning portion 31.

The axes of the positioning portion 31, the connecting portion 32 and the shaped portion 33 are located on the same straight line to facilitate the manufacturing molding of the mold core 3 and the installation of the mold core 3 into the mounting hole 11. The cross-sectional area of the connecting part 32 (i.e. the area of the exposed surface of the connecting part 32 when being intercepted by a plane perpendicular to the axis of the die core 3) is smaller than the cross-sectional area of the positioning part 31 (i.e. the area of the exposed surface of the positioning part 31 when being intercepted by a plane perpendicular to the axis of the die core 3), so that the positioning part 31 has a limiting effect on the connecting part 32 and the shaping part 33 to limit the die core 3 from moving towards the die pad 22 after the die core 3 is assembled in the mounting hole 11; since the shaping portion 33 needs to be adapted to the working belt 24 to produce an extruded product with composite requirements, when the cross-sectional area of the extruded product is smaller, the cross-sectional area of the shaping portion 33 also needs to be smaller, and by providing the connecting portion 32 with a cross-sectional area larger than that of the shaping portion 33 (i.e. the cross-sectional area of the connecting portion 32 is larger than that of the shaping portion 33), the overall structural strength of the mold core 3 is improved, so as to avoid the shaping portion 33 from being damaged due to the lower structural strength.

Further, in the direction from the connecting portion 32 to the shaping portion 33 (i.e., the direction of the X axis in fig. 1 is reverse), the connecting portion 32 and the shaping portion 33 are in smooth transition at the joint, that is, the joint of the connecting portion 32 and the shaping portion 33 is in a circular truncated cone or truncated pyramid structure, so as to improve the structural strength of the connecting portion 32 and the shaping portion 33 at the joint, thereby improving the structural strength of the shaping portion 33, and improving the stability and reliability of the mold core 3 during the operation of the micro-groove heat pipe extrusion mold.

Optionally, the side wall of the end of the shaping portion 33 extending into the working belt 24 is provided with a ridge structure and/or a groove structure, and the extending direction of the ridge structure and/or the groove structure is parallel to the axis of the shaping portion 33.

In this embodiment, when the extrusion die for a micro grooved heat pipe is used to manufacture a tube having a wick with a grooved microstructure on an inner surface, such as a micro grooved heat pipe, the side wall of one end of the shaping portion 33 extending into the working band 24 (i.e. the side surface of the rear end of the shaping portion 33 facing the inner wall of the working band 24) is provided with a grooved structure and/or a ridge structure; and the groove structure (prism structure) extends along the axial direction of the shaping part 33, so that the groove structure (prism structure) is matched with the inner wall of the working band 24, and the micro-groove heat pipe extrusion die can produce and manufacture the pipe (such as the micro-groove heat pipe) with the liquid absorption core with the groove microstructure.

The groove structure (prism structure) can be arranged on the inner wall of the working band 24, or on the side wall of one end of the shaping part 33 extending into the working band 24, so that the extrusion die for the micro-groove heat pipe can be suitable for producing and manufacturing pipes such as the micro-groove heat pipe. In this embodiment, a groove structure (a prism structure) is preferably provided on a side wall of one end of the shaping portion 33 extending into the working tape 24, so as to reduce the difficulty in forming the working tape on the rear mold body 21 and the difficulty in manufacturing the rear mold body 21.

Further, based on the groove structures (ridge structures) extending along the axial direction of the shaping portion 33, it is preferable that a plurality of groove structures (ridge structures) are arranged at intervals on the sidewall of one end of the shaping portion 33 extending into the working tape 24, that is, a plurality of groove structures (ridge structures) are arranged at intervals around the sidewall of the rear end of the shaping portion 33, so as to ensure that the groove microstructures formed on the inner wall of the produced pipe are uniformly distributed.

Optionally, as shown in fig. 1, fig. 2, fig. 4, fig. 5 and fig. 7, the blank cutter 25 includes a first blank cutter 251 and a second blank cutter 252 which are communicated, an end of the first blank cutter 251 away from the second blank cutter 252 is communicated with the working tape 24, and an end of the second blank cutter 252 away from the first blank cutter 251 penetrates through the die pad 22 and is communicated with the outside; and the first blank blade 251 has a cross-sectional area greater than the cross-sectional area of the working tape 24 and less than the cross-sectional area of the second blank blade 252.

In this embodiment, when the blank cutter 25 is only disposed on the die pad 22, the blank cutter 25 penetrates through the die pad 22, and the rear end of the working tape 24 (i.e. the end of the working tape 24 located on the opposite side of the X axis in fig. 1) penetrates through the side of the rear die body 21 away from the front die 1 and is communicated with the front end of the blank cutter 25; when the blank cutter 25 is provided on both the rear die body 21 and the die pad 22, the front end of the blank cutter 25 extends to the rear die body 21 and communicates with the rear end of the working tape 24.

The blank cutter 25 comprises a first blank cutter 251 and a second blank cutter 252 which are communicated, the second blank cutter 252 is arranged on the die cushion 22, the front end of the first blank cutter 251 (namely, the end of the first blank cutter 251 positioned in the positive direction of the X axis in fig. 7) penetrates through the rear die body 21 and is communicated with one end of the working tape 24 far away from the welding chamber 23, and the rear end of the first blank cutter 251 (namely, the end of the first blank cutter 251 positioned in the negative direction of the Z axis in fig. 7) is communicated with one end of the second blank cutter 252 facing to the front die 1; moreover, the cross-sectional area of the first blank cutter 251 (i.e. the area of the exposed surface of the first blank cutter 251 when the first blank cutter 251 is cut by the plane perpendicular to the axis of the first blank cutter 251) is larger than the cross-sectional area of the working belt 24 (i.e. the area of the exposed surface of the working belt 24 when the working belt 24 is cut by the plane perpendicular to the axis of the working belt 24), so that the extruded product extruded between the working belt 24 and the rear end of the die core 3 does not need to contact with the inner wall of the first blank cutter 251 when being discharged, thereby avoiding the inner wall of the first blank cutter 251 from playing a great role in blocking the discharging of the extruded product, reducing the friction force applied when the extruded product is discharged, and ensuring the smooth discharging of the extruded product. The cross-sectional area of the first blank cutter 251 is smaller than that of the second blank cutter 252 (i.e. the area of the exposed surface when the second blank cutter 252 is cut by a plane perpendicular to the axis of the second blank cutter 252), so as to further ensure the smooth demolding of the extruded product, and when the mold core 3 is provided with a plurality of second blank cutters 252, the working tape 24 is provided with a plurality of first blank cutters 251, at this time, only one second blank cutter 252 with a larger cross-sectional area may be provided, and one second blank cutter 252 is communicated with the plurality of first blank cutters 251, so that the plurality of extruded products can be all demolded from one second blank cutter 252. It should be noted that the second blank blade 252 may be provided in plurality.

Alternatively, as shown in fig. 1, 4, 5, and 7 in combination, the weld chamber 23 is provided on the side of the rear mold body 21 facing the front mold 1. The weld chamber 23 is provided on the side of the rear mold body 21 toward the front mold 1.

In the present embodiment, the welding chamber 23 is preferably provided on the rear mold body 21, specifically, the welding chamber 23 is provided on one side of the rear mold body 21 facing the front mold 1; on one hand, the rear die body 21 and the die pad 22 of the rear die 2 are easy to manufacture and mold, and the welding chamber 23 is arranged on the rear die body 21, so that the molding difficulty of the welding chamber 23 is reduced; on the other hand, make front mould 1 can keep great thickness to guarantee that front mould 1 and mold core 3 have great area of contact, thereby guarantee the steadiness when front mould 1 and mold core 3 know.

Optionally, as shown in fig. 1 and fig. 3, a plurality of shunting holes 12 penetrating through the front mold 1 are provided on the front mold 1, and the shunting holes 12 are all communicated with the welding chamber 23 and are arranged at intervals around the mounting hole 11.

In this embodiment, the branch discharge orifice 12 on the front mould 1 is equipped with a plurality ofly, and a plurality of branch discharge orifices 12 set up around the mounting hole 11 interval, that is to say, a plurality of branch discharge orifices 12 set up around mold core 3 interval, in order to guarantee that the blank that receives the extrusion on the front mould 1 deviates from back mould body 21 one side can be evenly through the edge of a plurality of branch discharge orifices 12 plastic flow to the seam room 23, and towards seam room 23 middle part gathering, thereby be convenient for the blank in the seam room 23 along the lateral wall extrusion to the working tape 24 internal forming of the design portion 33 that is located the seam room 23 middle part equally, and from idle knife 25 department demolding, in order to accomplish the manufacturing of extruded product.

Alternatively, as shown in fig. 1, fig. 2, fig. 4 and fig. 7, the front mold 1 and the rear mold body 21 are respectively provided with one of the positioning grooves 26 and the positioning table 13, and the positioning table 13 is in inserted fit with the positioning grooves 26.

In this embodiment, the positioning table 13 may be disposed on one side of the front mold 1 facing the rear mold body 21, and the positioning groove 26 may be disposed on one side of the rear mold body 21 facing the front mold 1; or a positioning groove 26 is arranged on one side of the front mould 1 facing the rear mould body 21, and a positioning table 13 is arranged on one side of the rear mould body 21 facing the front mould 1; location platform 13 and constant head tank 26 are pegged graft and are cooperated to make front mould 1 and back mould body 21 spacing each other in the direction that is perpendicular to front mould 1 (back mould body 21) axis, the steadiness when further having promoted front mould 1 and back mould body 21 and being connected.

Further, the positioning table 13 is a boss-shaped structure, and the shape of the positioning groove 26 is matched with the shape of the positioning table 13.

Optionally, as shown in fig. 1-3, 6 and 7, the micro-groove heat pipe extrusion die further includes a positioning member 4, the micro-groove heat pipe extrusion die is adapted to be assembled in a die holder of the extruder, and the positioning member 4 is disposed on an outer side wall of the rear die body 21 and/or on an outer side wall of the die pad 22, and is used for limiting the micro-groove heat pipe extrusion die to rotate around an axis of the micro-groove heat pipe extrusion die in the die holder.

The micro-groove heat pipe extrusion die is assembled on a die holder of an extruder so as to ensure the stability of the micro-groove heat pipe extrusion die during working operation; the extruder is used for extruding the blank on the side of the front die 1, which faces away from the rear die body 21, so as to extrude the blank from the shunting hole 12 into the micro-groove heat pipe extrusion die. The positioning members 4 are preferably disposed on the outer side walls of the rear mold body 21 and/or on the outer side walls of the mold pad 22 to prevent the positioning members 4 from interfering with the installation and replacement of the mold cores 3 when disposed on the outer side walls of the front mold 1. The positioning element 4 may be a structure protruding on the outer side wall of the rear mold body 21 (mold pad 22), or the positioning element 4 may be detachably connected to the rear mold body 21 (mold pad 22). In the present embodiment, it is preferable that the positioning element 4 is detachably connected to the rear mold body 21 (mold pad 22) to reduce the manufacturing difficulty and cost of the rear mold body 21 (mold pad 22), specifically, the positioning element 4 includes a fastening element such as a pin, a bolt, etc. and is connected to the outer side wall of the rear mold body 21 (mold pad 22), one end of the positioning element 4 is detachably connected to the rear mold body 21 (mold pad 22) to ensure the stability and convenience of the positioning element 4 when being connected to the rear mold body 21 (mold pad 22), the other end of the positioning element 4 extends in the direction away from the rear mold body 21 (mold pad 22), and the axis of the positioning element 4 is perpendicular to the axis of the rear mold body 21 (mold pad 22) to ensure that the positioning element 4 can be stably matched with the corresponding structure on the mold base of the extruder, so as to limit the rotation of the rear mold body 21 (mold pad 22) around the axis of the rear mold body 21 (mold pad 22) in the mold base of the, therefore, the micro-groove heat pipe extrusion die is limited to rotate around the axis of the micro-groove heat pipe extrusion die in the die holder, and the stability of the micro-groove heat pipe extrusion die during working operation is ensured.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. A micro-groove heat pipe extrusion die is characterized by comprising a die core (3), a front die (1), a rear die body (21) and a die pad (22), wherein the front die, the rear die body and the die pad are detachably connected in sequence; a welding chamber (23) is arranged at the joint of the rear die body (21) and the front die (1), a working belt (24) communicated with the welding chamber (23) is arranged on the rear die body (21), a blank cutter (25) is arranged at the joint of the rear die body (21) and the die pad (22), one end, far away from the welding chamber (23), of the working belt (24) is communicated with one end of the blank cutter (25), and the other end of the blank cutter (25) penetrates through the die core (3); the front die (1) is provided with a mounting hole (11) penetrating through the front die (1), and the mounting hole (11) is communicated with the welding chamber (23); the mold core (3) is suitable for being inserted into the mounting hole (11) and detachably connected with the mounting hole (11), and one end, facing the mold pad (22), of the mold core (3) extends into the working belt (24) through the welding chamber (23).

2. The microminiature groove heat pipe extrusion die set forth in claim 1, wherein said mold core (3) comprises a positioning portion (31), a connecting portion (32) and a shaping portion (33), said positioning portion (31), said connecting portion (32) and said shaping portion (33) being connected in sequence in the direction from said front mold (1) to said rear mold body (21); the mounting hole (11) comprises a first accommodating hole (111) and a second accommodating hole (112), the first accommodating hole is suitable for accommodating the positioning part (31), the second accommodating hole is suitable for accommodating the connecting part (32), and the hole wall of the first accommodating hole (111) is suitable for limiting the positioning part (31) to rotate around the axis of the positioning part (31); the connecting portion (32) with the junction of design portion (33) is located in weld room (23), just design portion (33) is kept away from the one end of connecting portion (32) extends to in the working tape (24).

3. The micro-miniature grooved heat pipe extrusion die of claim 2, wherein said shaped portion (33) is disposed coaxially with said working band (24), and an annular gap is provided between a sidewall of one end of said shaped portion (33) extending into said working band (24) and an inner wall of said working band (24).

4. The extrusion die for a micro-groove heat pipe as claimed in claim 3, wherein the positioning portion (31), the connecting portion (32) and the shaped portion (33) are coaxially disposed, and the cross-sectional area of the connecting portion (32) is larger than that of the shaped portion (33) and smaller than that of the positioning portion (31).

5. The extrusion die for the micro-groove heat pipe as claimed in any one of claims 2 to 4, wherein the side wall of one end of the shaping part (33) extending into the working band (24) is provided with a prism structure and/or a groove structure, and the extending direction of the prism structure and/or the groove structure is parallel to the axis of the shaping part (33).

6. The microminiature groove heat pipe extrusion die set forth in any one of claims 1-4, wherein said blank (25) comprises a first blank (251) and a second blank (252) in communication, an end of said first blank (251) remote from said second blank (252) communicating with said working tape (24), and an end of said second blank (252) remote from said first blank (251) penetrating said die pad (22) and communicating with the outside; and the cross-sectional area of the first blank blade (251) is larger than that of the working belt (24) and smaller than that of the second blank blade (252).

7. The micro-miniature groove heat pipe extrusion die of any of claims 1-4, wherein said weld chamber (23) is disposed on a side of said rear die body (21) facing said front die (1).

8. The extrusion die for the micro-groove heat pipe as claimed in any one of claims 1 to 4, wherein a plurality of shunting holes (12) penetrating through the front die (1) are formed on the front die (1), and the plurality of shunting holes (12) are all communicated with the welding chamber (23) and are arranged at intervals around the mounting hole (11).

9. The micro-miniature groove heat pipe extrusion die of any of claims 1-4, wherein said front die (1) and said rear die body (21) are respectively provided with one of a positioning groove (26) and a positioning table (13), said positioning table (13) is in plug-in fit with said positioning groove (26).

10. The micro-groove heat pipe extrusion die of any one of claims 1 to 4, further comprising a positioning member (4), wherein the micro-groove heat pipe extrusion die is adapted to be assembled in a die holder of an extruder, and the positioning member (4) is disposed on an outer side wall of the rear die body (21) and/or on an outer side wall of the die pad (22) for limiting the micro-groove heat pipe extrusion die to rotate around an axis of the micro-groove heat pipe extrusion die in the die holder.

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