CN103273186A - Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod - Google Patents
Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod Download PDFInfo
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- CN103273186A CN103273186A CN2013102278360A CN201310227836A CN103273186A CN 103273186 A CN103273186 A CN 103273186A CN 2013102278360 A CN2013102278360 A CN 2013102278360A CN 201310227836 A CN201310227836 A CN 201310227836A CN 103273186 A CN103273186 A CN 103273186A
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Abstract
The invention provides a working device for extruding miniature thin-wall multi-hole flat pipes by using a multiple-step tower-shaped fishtail type core rod. A design mode of a tower-shaped fishtail type core rod is applied to a divergent die extrusion process of the miniature ultrathin-wall aluminum alloy flat pipes, the design is considered from the perspectives of increase of the contact area of metal in a welding-on region and improvement of welding-on possibility, and the overall dimension of the core rod is modified. The design idea facilitates the area of a material preparation region before welding-on through change of a series of cross-section shapes and design of a multiple-step cross-section transition region, the step number and the minimum critical dimension of the core rod can be designed for the divergent die extrusion of the miniature pipes according to the demands for different section bar cross sections and supporting strength of the core rods made from different materials, and an application range of the design idea of the core rod is not limited in section bars with certain shapes and is greatly widen in the production and application field of relevant aluminum alloy products. The dead-zone forming problem in a traditional process is also solved through selection of cross-section shapes in the design, and the design reasonability is further improved. The working device for extruding the miniature thin-wall multi-hole flat pipes by using the multiple-step tower-shaped fishtail type core rod has wide application prospect.
Description
Technical field
The present invention relates to the technology of miniature ultra-thin-wall flat tube material hot extrusion, be used for the mould design of hot extrusion molding divergent die.
Background technology
Along with the widespread usage of divergent die extrusion technique in tubing is produced, also raise gradually for the demand of producing miniature tubing such as aluminium alloy and copper alloy.The problem of difficulty is filled in the materials flow that exists in the method for designing of tradition divergent die seam chamber, particularly at the muscle of miniature porous tubing and the insufficient seam difficult problem that causes of materials flow filling of seam place of lateral wall.Prior art SMIS clavate shape and size design are paid close attention to sizing and are extruded the stage, thereby the profile of not considering plug is passed through and has been increased the phenomenon that metal filled difficulty has been improved in the zone of getting the raw materials ready after phase change is extruded in weldering and band and sizing, does not propose soluble scheme for weldering and difficult material.
Summary of the invention
The present invention seeks to solve the problems such as seam difficulty that existing mold exists materials flow to fill difficulty and cause because materials flow is insufficient, a kind of equipment of thin-walled porous flat pipe material of multistage turriform fishtail type plug is provided.This device is at the geomery of the basis of original technology design related die structure, for metal seam prerequisite for big Material Staging Area, the sizing of realizing tubing on the basis of seam fully with extrude.
The equipment of the thin-walled porous flat pipe material of multistage turriform fishtail type plug provided by the invention, comprise die sleeve, place support ring, seam mould, water conservancy diversion mould and divergent die in the installing hole of die sleeve successively, plug is arranged in the water conservancy diversion mould, the upper fixed of die sleeve has recipient, be disposed with dummy block and extrusion axis in the recipient, described plug is multistage turriform fishtail type plug, this plug is designed to multiple-rank arrangement, concrete exponent number is according to the intensity of plug, rigidity, stability requirement and production equipment need be determined; This plug is characterised in that the multistage reducing by section provides big Material Staging Area, first rank of plug are by the supercharging band of getting the raw materials ready, diversion belt and calibrating strap three subregions are formed, and the supercharging band general shape size of getting the raw materials ready is less than calibrating strap, and the centre carries out the transition to calibrating strap by diversion belt; Follow-up every rank are formed by get the raw materials ready supercharging band and diversion belt, and the supercharging band of getting the raw materials ready of every rank plug is all less than the size of its diversion belt.
On the basis of above mentality of designing, because infinite multistage mandrel structure is difficult to accurately describe with diagram, the present invention has designed plug and has had three rank turriform fishtail type mandrel structures.And then set forth the mentality of designing of this invention.
Each rank is got the raw materials ready between the supercharging band excessive by diversion belt, and the excursion in each plug cross section, rank of taking the supercharging band of getting the raw materials ready on last rank from the sizing of final typing to is followed successively by: rectangle, square, inscribe square, necking down inscribe square, inner ellipse shape and necking down inner ellipse shape.
Described each rank diversion belt is 1:10 ~ 1:20 with the length ratio of the supercharging band of getting the raw materials ready.Each rank supercharging band of getting the raw materials ready can be formulated every rank length according to section bar size and changes of section.The get the raw materials ready equal in length of supercharging band of each rank of plug realizes that materials flow is even, and seam is abundant.
The tapering on first rank of described plug is 20 degree-30 degree, and follow-up every rank plug reducing tapering is 45 degree.
Forming process
Metal stock experiences divergent die, the water conservancy diversion mould under plus load, after entering the seam chamber, under the internal pressure effect of mold cavity, flow into the supercharging band of getting the raw materials ready between the plug, for seam provides big contact area and hydrostatic pressure, fully after the contact, under the effect of pressurized, realize seam.Metal flow is convenient in the design of diversion belt, and makes the pressure loading of the metal pair plug of tube reducing distortion satisfy the critical load value of plug.The length of calibrating strap need be taken all factors into consideration dwell pressure and be beneficial to the effect of extruding with reducing friction, determines this length.
The advantage of this design:
1. certain in plug length, under the certain prerequisite of final shaping size, increased the number of times that sectional dimension reduces, under the prerequisite that mandrel material intensity meets the demands, can reduce the area of section of plug.
2. the length of different cross section transition region (diversion belt) can be adjusted at random according to the needs of seam chamber and Material Staging Area size.
3. the geometric ways of changes of section has multiple selectively, on the basis of satisfying certain processing prerequisite, can design voluntarily according to the needed Material Staging Area size of extrusion process.
4. the minimizing in plug cross section finally can make Material Staging Area and seam district strengthen.For realizing that seam provides the contact area of shunting blank.
5. the best innovative point of this design for scheme is that square section (2-2) inwardly connects the transition of square section (3-3), is convenient to shunt metal from plug up and down between two side inflow plugs, and the methods for designing of 45 degree have been avoided the formation in traditional handicraft extruding dead band.And the design of follow-up inner ellipse also is to have followed this design principle.
6. under the design concept that reduces in the plug cross section, cooperate fish tail type tapering transition typing plug design.The taper design pattern of this plug has not only increased the required static pressure of metal seam, has also avoided the plug streamline to change the excessive metal eddy current that brings and turbulent flow phenomenon.
7. the unlimited minimizing of cross sectional shape (increase of turriform exponent number) constitutes the turriform Design Mode of this design, and the turriform design is combined with variable cross section, has increased the flexibility of process application.
Description of drawings
In the accompanying drawing: 1 extrusion axis, 2 dummy blocks, 3 recipients, 4 pins, 5 divergent dies, 6 water conservancy diversion moulds
7 seam moulds seam chambers 8,9 plugs, 10 support rings, 11 die sleeves, 12 ingot blanks, 13 screws.
Accompanying drawing 2 is 1 rank plug rigging position schematic diagram.
In the accompanying drawing: 14 Material Staging Areas, 15 diversion belts, the 16 supercharging bands of getting the raw materials ready.
Accompanying drawing 3 is seam chamber plug position view.
In the accompanying drawing: 9 plugs, 17 Material Staging Areas.
Accompanying drawing 4 is single plug schematic diagram.
In the accompanying drawing: I-I, II-II, III-III, IV-IV, V-V, VI-VI is respectively the sectional position.
Accompanying drawing 5 single plug changes of section schematic diagrames.
In the accompanying drawing: I-I, II-II, III-III, IV-IV, V-V, VI-VI is respectively cross sectional shape.
The specific embodiment
Embodiment 1:
One. mould structure
As shown in Figure 1, the equipment of the thin-walled porous flat pipe material of multistage turriform fishtail type plug provided by the invention comprises the moulding section of mould, standing part, pressures partially.
Moulding section comprises: divergent die 5, water conservancy diversion mould 6, seam mould 7, plug 9.
Standing part comprises: pin 4, recipient 3, support ring 10, die sleeve 11 screws 13
Pressures partially comprises: extrusion axis 1, dummy block 2.
The concrete structure of this mould is, place support ring 10 in the installing hole of die sleeve 11 successively, weldering and mould 7, water conservancy diversion mould 6, with divergent die 5, plug 9 is arranged in the water conservancy diversion mould 6, fixedly there is recipient 3 top of die sleeve by pin 4 and screw 13, being placed with dummy block 2 in the recipient successively is multistage turriform fishtail type plug (seeing Fig. 2 to Fig. 5) with extrusion axis 1. described plugs, this plug by first rank by the supercharging band of getting the raw materials ready, diversion belt, (see figure 2) is formed in calibrating strap three subregions, get the raw materials ready supercharging band general shape size less than calibrating strap, and the centre carries out the transition to calibrating strap by diversion belt.If the plug exponent number increases, follow-up plug is formed (see figure 3) by get the raw materials ready supercharging band and diversion belt.
Two. the Mould design thinking
The present invention is directed to extrusion die on the basis of the moulding of thin-walled porous flat pipe material, solve the problems such as seam difficulty that existing mold exists materials flow to fill difficulty and cause because materials flow is insufficient, a kind of equipment of thin-walled porous flat pipe material of multistage turriform fishtail type plug is provided.This device is at the geomery of the basis of original technology design related die structure, for metal seam prerequisite for big Material Staging Area, the sizing of realizing tubing on the basis of seam fully with extrude.
Accompanying drawing 1 is the mould structure of this technical process.At the extrusion process of miniature ultra-thin-wall flat tube material, still be difficult to realize in the seam process of seam regional metal after importing.In the accompanying drawing 1, plug is fixed on the water conservancy diversion mould 6, and metal flows into the seam district, and the seam band around plug is realized the seam process.So the size of plug determines metal in seam district to realize the key factor of seam with forming outward.
Especially at the extrusion process of miniature ultra-thin-wall flat tube material, because wall thickness is thin excessively, metal is under the pressure that mold cavity and plus load provide, the seam zone that flows between the plug is difficult, so, the contact area of shunting metal when increasing the distance between the plug and then increasing seam helps to realize the seam process.Under the prerequisite that fixed form and the mandril strength of plug satisfies ultimate load, we can reduce the sectional area of plug, and then increase distance between the plug.And prolong the axial length in this cross section on the basis of the new cross sectional shape that forms, thereby form bigger seam district.
Based on above principle, accompanying drawing 2 is the basic schematic diagram of 1 rank plug mentality of designing, is made up of three subregions, is respectively the supercharging band of getting the raw materials ready, diversion belt, calibrating strap.Get the raw materials ready supercharging band general shape size less than calibrating strap, carry out the transition to calibrating strap by diversion belt, Material Staging Area has increased the contact area of shunting metal seam, and this regional hydrostatic pressure is raise, and has played the effect of the supercharging of getting the raw materials ready.After metal flow was crossed above-mentioned zone, because the plug size becomes greatly gradually, the metal flow in stock ground was deformed into the master with tube reducing herein, and owing to the effect of plug friction, hydrostatic pressure continues to raise simultaneously.After plug continues to stay above-mentioned zone, enter the sizing zone, the overall dimension of this regional metal equals the size of required section bar, and metal flow is through this zone, and hydrostatic pressure slowly raises, and the stock ground behind the free end of extruding for metal provides big hydrostatic pressure.For follow-up seam of extruding metal provides necessary condition.This figure purpose is to provide basic mentality of designing by the get the raw materials ready effect of supercharging band and diversion belt of single order mandrel structure explanation for designing multistage plug.
Based on above principle, accompanying drawing 3 is multistage plug distribution map, because the schematic diagram of infinite rank plug is difficult to accurately express with graphic technique, 3 rank mandrel structures have been designed in the accompanying drawing 3, as shown in Figure 3, after the plug sectional area narrowed down, every plug both sides all can form bigger seam district.If do not realize seam herein immediately after metal enters the seam chamber, also can form a large amount of Material Staging Areas herein, along with plug lateral cross section size strengthens, distance reduces gradually between the plug, and the interior pressure of metal flow increases.Also can form seam.
The first rank tapering of described plug is changed to 20 degree～30 degree, and follow-up every rank tapering is 45 degree
Plug zero draft zone and the axial length beguine that the tapering zone is arranged are decided according to the size at the length of mould seam chamber and seam angle.
Accompanying drawing 4 is the structure chart of single 3 rank plugs in the accompanying drawing 3.
Rectangle → square → inscribe square → necking down inscribe square → inner ellipse → necking down inner ellipse
Three. forming process
Present embodiment medium section wall thickness 0.25mm ~ 0.35mm, extrusion temperature 440
0C ~ 460
0C, extrusion ratio 13, extrusion speed 1mm/s, the constant load 1000000N-1500000N of hydraulic press, blank are the cylindrical, massive blank, material is selected 6063 line aluminium alloys.
At the extrusion process of miniature ultra-thin-wall flat tube material divergent die, metal has experienced shunting respectively, imports seam, extrusion molding four-stage.Metal stock (ingot blank 12) is under plus load, the experience divergent die, the water conservancy diversion mould, after entering seam chamber 8, under the internal pressure effect of mold cavity, flow into the Material Staging Area between the plug, for seam provides big contact area and hydrostatic pressure, fully after the contact, under the effect of multidirectional pressurized, realize seam.
Press-fit form respectively with support ring 10 by employing, seam mould 7, water conservancy diversion mould 6, once be pressed in the die sleeve 11, plug 9 is pressed into water conservancy diversion mould 6, divergent die 5 is positioned on the water conservancy diversion mould 6, with recipient 3 and die sleeve 11 with pin 4, screw 13 links to each other, 12 pressurizations make its distortion to extrusion axis 1 to ingot blank when equipment provides plus load, and deformable metal flows into seam district (Material Staging Area) through shunting successively flow through divergent die 5 and water conservancy diversion mould 6 when seam mould 7, provide at mold cavity and to depress in bigger, realize the seam extrusion.
The tubing of this examples preparation does not have the phenomenon of tearing when extruding, section configuration, and size satisfies required precision, and intensity meets the demands, and mechanical property is better.
Claims (5)
1. the equipment of mould is shunted in the thin-walled porous flat pipe material hot extrusion of a multistage turriform fishtail type plug, comprise die sleeve, place support ring in the installing hole of die sleeve successively, weldering and mould, the water conservancy diversion mould, divergent die, plug is fixed in the water conservancy diversion mould to press-fit form, the upper fixed of die sleeve has recipient, is disposed with dummy block and extrusion axis in the recipient, it is characterized in that described plug is multistage turriform fishtail type plug, this plug is designed to multiple-rank arrangement, concrete exponent number is according to the intensity of plug, rigidity, and stability requirement and production equipment need be determined; First rank of plug are by the supercharging band of getting the raw materials ready, and diversion belt and calibrating strap three subregions are formed, and the supercharging band general shape size of getting the raw materials ready is less than calibrating strap, and the centre carries out the transition to calibrating strap by diversion belt; Follow-up every rank are formed by get the raw materials ready supercharging band and diversion belt, and the supercharging band of getting the raw materials ready of every rank plug is all less than the size of its diversion belt.
2. the equipment of the thin-walled porous flat pipe material hot extrusion of multistage turriform fishtail type plug according to claim 1 shunting mould is characterized in that described plug includes the Material Staging Area that multistage plug reducing forms respectively; Based on multistage principle, 3 rank mandrel structures have been designed, be provided with transitional region between the Material Staging Area of the every rank of 3 rank plugs, the cross section of each rank Material Staging Area and transitional region is followed successively by by the supercharging band of getting the raw materials ready that the sizing on first rank takes last rank to: rectangle, square, inscribe square, necking down inscribe square, inner ellipse shape and necking down inner ellipse shape.
3. the equipment of the thin-walled porous flat pipe material hot extrusion of multistage turriform fishtail type plug according to claim 2 shunting mould is characterized in that described each rank diversion belt and the length ratio of the supercharging band of getting the raw materials ready are 1:10-1:20.
4. the equipment of mould is shunted in the thin-walled porous flat pipe material hot extrusion of multistage turriform fishtail type plug according to claim 3, it is characterized in that the equal in length of described each rank Material Staging Area.
5. shunt the equipment of mould according to the thin-walled porous flat pipe material hot extrusion of each described multistage turriform fishtail type plug of claim 1 to 4, it is characterized in that at the required tapering of the described plug of the first rank plug be 20 degree-30 degree, follow-up every rank plug tapering is selected 45 degree.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310227836.0A CN103273186B (en) | 2013-06-08 | 2013-06-08 | Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310227836.0A CN103273186B (en) | 2013-06-08 | 2013-06-08 | Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod |
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| CN103273186A true CN103273186A (en) | 2013-09-04 |
| CN103273186B CN103273186B (en) | 2015-04-15 |
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| CN201310227836.0A Expired - Fee Related CN103273186B (en) | 2013-06-08 | 2013-06-08 | Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod |
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Cited By (5)
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| CN103706660A (en) * | 2013-12-20 | 2014-04-09 | 广铝集团有限公司 | Aluminum profile extruding die sleeve |
| CN103962406A (en) * | 2014-05-05 | 2014-08-06 | 天津理工大学 | Extrusion-expansion combination mold for pipe formed by flow dividing mold |
| WO2017049668A1 (en) * | 2015-09-23 | 2017-03-30 | 江苏大学 | Combined mold core for supercharged multichannel pipe divergent mold |
| CN107377653A (en) * | 2017-09-22 | 2017-11-24 | 南昌航空大学 | The flat prod cast of extruding metal |
| CN107570546A (en) * | 2017-10-18 | 2018-01-12 | 山东大学 | A kind of Multifunctional extrusion mould structure and method |
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| CN107570546A (en) * | 2017-10-18 | 2018-01-12 | 山东大学 | A kind of Multifunctional extrusion mould structure and method |
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