CN105033141A - Reciprocating extruding and upsetting device and use method and application thereof - Google Patents
Reciprocating extruding and upsetting device and use method and application thereof Download PDFInfo
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- CN105033141A CN105033141A CN201510300188.6A CN201510300188A CN105033141A CN 105033141 A CN105033141 A CN 105033141A CN 201510300188 A CN201510300188 A CN 201510300188A CN 105033141 A CN105033141 A CN 105033141A
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Abstract
The invention provides a reciprocating extruding and upsetting device for manufacturing an ultra-fine grain pie material. The reciprocating extruding and upsetting device comprises an upper male die, a female die, a lower male die and a base. The base is detachably arranged at the bottom of the female die. An upper cavity and a lower cavity which are communicated with each other are arranged in the female die. The inner side of the bottom of the upper cavity is in an arc shape with an extruding opening. The inner side of the lower cavity is in an arc shape as well. The arc shape on the inner side of the upper cavity and the arc shape on the inner side of the lower cavity have the equal radius. The reciprocating extruding and upsetting device has the beneficial effects that arc transition is adopted for a reducing region of the female die, an extruded dead region where the material flows slowly and unevenly in conventional extruding operation is effectively avoided, stress is distributed evenly, and grain dispersity is small.
Description
Technical field
The present invention relates to a kind of method of plastic forming technology field, specifically a kind of back and forth crowded gathering apparatus and processing method thereof preparing Ultra-fine Grained pie material.
Background technology
Super fine crystal material integrates excellent intensity and the high performance material of good plasticity and toughness.And severe Plastic Deformation Methods (SPD) has significant grain refining capability, be a kind ofly generally acknowledged prepare Ultra-fine Grained (grain size is 100nm-1um) and the most promising method of block nanometer (crystal grain is less than 100nm) material.
Through finding the literature search of prior art, utility model patent " prepares the reciprocating extrusion device of super fine crystal material ", and (patent No.: ZL200720075526.1) discloses a kind of reciprocating extrusion device, this device can remarkable crystal grain thinning, but mould structure determines this reciprocating extrusion device and is only limitted to the stub material that production draw ratio is less than certain particular value, be difficult to produce sheet material or the larger block materials of volume; When passage extrusion ratio is large, the easy unstability of blank, therefore pass deformation is restricted; Meanwhile, extruding dead band is difficult to avoid, and the material being arranged in extruding dead band flows slow and insufficient in process, and dependent variable is significantly less than other regions.
Further retrieval finds, patent of invention " Multidirectional combined type circulating upsetting pressure device and upsetting pressure method " (patent No.: ZL201010595910.0) provides a kind of large plastometric set processing method of producing the larger ultra-fine crystal block body material of volume.The method first utilizes forward upsetting pressure device that square-section bar is processed as block sample, is then again extruded as bar prismatic with initial blank in side direction upsetting pressure device by this block sample, so repeatedly, thus realizes the preparation of ultra-fine crystal block body material.The most obvious shortcoming of the method is that needs two mold coordinates and could realize, and accordingly, in plastic processing, also need the operation simultaneously of two press, production equipment utilization rate is low, is difficult to expanding production.In addition, when utilizing this device turned blank, blank can reach 360 ° of circumferential flow in forward upsetting pressure device, realizes fully flowing in three dimensions.But now the circumferential flow of blank belongs to and flows freely without back pressure type, and at Plastic Flow die joint, place easily ftractures, the block materials namely produced with this device is inevasible also exists macroscopic cracking.Above-mentioned two shortcomings seriously constrain the application of the method in ultra-fine crystal block body material.
Summary of the invention
The present invention is directed to prior art above shortcomings, there is provided a kind of novel and be suitable for the large plastometric set device of large volume pie manufacture of materials and concrete processing method, the method die necking down district adopts arc transition, effectively avoid in conventional extrusion the extruding dead band of flowing slow and uneven, Strain Distribution is more even; The concave circular arcs die cavity of lower punch end can provide certain equivalent back pressure simultaneously, reduces the tendency that material ftractures at die joint place, left and right; Can be used for preparing the multiple Ultra-fine Grained pie materials such as simple metal, alloy, intermetallic compound, composite, macromolecular material, semi-conducting material.
The present invention is achieved by the following technical solutions:
First aspect, the invention discloses a kind of back and forth crowded gathering apparatus preparing Ultra-fine Grained pie material, it comprises upper male mould, die, lower punch and base, described base is removable installed in the bottom of die, the upper impression be interconnected and lower impressions is provided with in described die, and the bottom inside of described upper impression is in the arc with extrusion mouth, the inner side of described lower impressions is also arc, and the arc inside upper impression has equal radius with the arc inside lower impressions.
Preferably, the bottom of described die is also movably equipped with the cushion block for regulating lower punch height.
Preferably, described die is embedded on base by the screens groove on base.
Second aspect, the invention discloses a kind of based on aforesaid back and forth crowded upsetting method of back and forth squeezing gathering apparatus, it comprises the steps:
After S1, preheated charge, die and upper and lower punch, blank, upper male mould and lower punch are placed within concave die cavity;
S2, upper male mould to be exerted pressure, described blank is pressed into by upper cavity and carries out crowded pier in lower mode cavity and operate, until it is complete to fill type;
S3, detach cushion block, take out lower punch and blank, complete the first passage processing;
S4, repetition step S1 ~ S3, realize multi-pass and back and forth squeeze pier.
Preferably, in step S2, described crowded pier operation comprises as the next stage:
Pier squeezes early stage, and blank fills type in upper impression, enters lower impressions by extrusion mouth simultaneously;
Blank lower impressions fill type complete after, occur without dead band crimp, until blank contact lower punch;
After blank contact lower punch, there is Upsetting, until it is complete to fill type in both sides flowing to the left and right under the effect of lower punch.
Preferably, described multi-pass process is achieved by different machining paths.
Preferably, described path comprises:
Path A, blank does not rotate between adjacent two passages;
Path B, blank is at adjacent its central axis half-twist of two passage spaced windings;
Path C, blank rotates 180 ° at adjacent two its central axis of passage spaced winding.
The third aspect, the invention discloses the purposes of a kind of reciprocal crowded gathering apparatus as the aforementioned in simple metal, alloy, intermetallic compound, composite, macromolecular material, the preparation of semi-conducting material Ultra-fine Grained pie material.
Compared with prior art, the present invention has following beneficial effect:
1, patent of the present invention provides a kind of novel and be suitable for the large plastometric set device of large volume pie manufacture of materials and concrete processing method;
2, the die necking down district of patent of the present invention adopts arc transition, effectively avoids in conventional extrusion the extruding dead band of flowing slow and uneven, and Strain Distribution is even, and grain dispersion is little;
3, patent of the present invention is in blank upsetting process, and the concave circular arcs die cavity of lower punch end can provide certain equivalent back pressure, reduces the tendency that material ftractures at die joint place, left and right;
The passage true strain of 4, squeezing upsetting regulates and controls by the size of two radius of a circles and distance of center circle.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 back and forth squeezes upsetting mould structure outline drawing;
Fig. 2 longitudinally partly cuts open profile for back and forth squeezing upsetting mould;
Fig. 3 is that die, blank, upper male mould and lower punch coordinate sectional view;
In figure: 1, upper male mould; 2, die; 3, lower punch; 4, base; 5, cushion block; 6, blank; 7, upper impression; 8, lower impressions; 9, step; 10, screens groove.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
embodiment 1
A kind of back and forth crowded gathering apparatus preparing Ultra-fine Grained pie material provided by the invention, its structure, as schemed as shown in Figure 1, Figure 2 and Figure 3, comprising: upper male mould 1, die 2, lower punch 3, base 4, cushion block 5; Base 4 is removable installed in the bottom of die 2, is provided with necking down district in die 2, and die 2 inside is marked off the upper impression 7 and lower impressions 8 that are interconnected by this necking down district; Wherein the bottom inside of upper impression 7 is in the arc with extrusion mouth; The inner side of lower impressions 8 is also arc, and the arc inside upper impression 7 has equal radius with the arc inside lower impressions 8.
The lower end of upper male mould 1 coordinates with the bottom of die 2 upper impression 7, and the upper end of upper male mould 1 coordinates with die 2 upper impression 7 interior step 9, determines the lower position of upper male mould 1 in process.
Die 2 is embedded on base 4 by the screens groove 10 on base 4.
The outer contour of two semicolumns that the necking down district, inside of die 2 is equal by radius, circular section is intersected is formed, and arc transition effectively prevent in " dead band " in conventional extrusion; Die 2 die cavity THICKNESS CONTROL, 0.2 ~ 2R (R is the circular section radius of semicolumn), directly can prepare the blank 6 of respective thickness; Passage true strain changes by the size changing two intersected cylinder circular section radiuses and distance of center circle.
The upper end of punch 3 coordinates with the first half of die lower impressions 8, forms a cylindrical region can filled for blank 6; The geometry concave surface of lower punch 3 can produce side direction compression to the lateral flow of blank 6, thus reduces the tendency of blank 6 at flowing die joint place, left and right cracking; The circular arc portion of lower punch 3 is designed with certain wall thickness, prevents lower punch 3 from rupturing in process.
Knockout course is by realizing by pull cushion block 5, and lower punch 3 is placed on cushion block 5, after every time process finishing, detaches cushion block 5 and lower punch 3 can realize the demoulding.
Multi-pass process can be achieved by different machining paths.Machining path is defined by the relative position of blank between adjacent two processing passages: path A, and blank does not rotate between adjacent two passages; Path B, blank is at adjacent its central axis half-twist of two passage spaced windings; Path C, blank rotates 180 ° at adjacent two its central axis of passage spaced winding.
Be that aluminum alloy specimen 6 and the upper male mould 3 of Φ 100mm × 20mm is preheated to processing temperature (180 ~ 300 DEG C) in resistance furnace by physical dimension, adopt heating jacket that the die 2 assembled and lower punch 3 are preheated to identical temperature simultaneously.After preheating completes, transferred to by blank 6 in die upper impression 7, upper male mould 1 is placed on blank.Adopt 300 t hydraulic press to be depressed with the speed of 1mm/s by upper male mould, crowded upsetting distortion is carried out to blank.In earlier stage, blank 2 fills type in upper impression, enters lower impressions by extrusion mouth simultaneously in distortion; Upper impression fill type complete after, there is typical crimp in blank, until blank contact lower punch; After blank contacts with lower punch, there is Upsetting in blank two ends lateral flow to the left and right under the effect of lower punch.The lateral flow of geometry concave surface to blank of lower punch 3 produces certain compression, can reduce the tendency of blank at flowing die joint place, left and right cracking.After treating that blank 2 enters lower impressions 8, stop extruding, detach cushion block 5, exit lower punch 3, blank 2 is ejected, complete the first passage processing.Clear up mould afterwards, and apply next machining and need lubricant, repeat said process to complete multi-pass processing.Between adjacent two processing passages, can be realized by machining path A, B, C defined above, theory analysis machining path B can obtain more uniform Strain Distribution.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. prepare the back and forth crowded gathering apparatus of Ultra-fine Grained pie material for one kind, it is characterized in that, comprise upper male mould, die, lower punch and base, described base is removable installed in the bottom of die, the upper impression be interconnected and lower impressions is provided with in described die, and the bottom inside of described upper impression is in the arc with extrusion mouth, the inner side of described lower impressions is also arc, and the arc inside upper impression has equal radius with the arc inside lower impressions.
2. back and forth crowded gathering apparatus as claimed in claim 1, it is characterized in that, the bottom of described die is also movably equipped with the cushion block for regulating lower punch height.
3. back and forth crowded gathering apparatus as claimed in claim 1, it is characterized in that, described die is embedded on base by the screens groove on base.
4., based on the back and forth crowded upsetting method of back and forth squeezing gathering apparatus described in claim 1,2 or 3, it is characterized in that, comprise the steps:
After S1, preheated charge, die and upper and lower punch, blank, upper male mould and lower punch are placed within concave die cavity;
S2, upper male mould to be exerted pressure, described blank is pressed into by upper cavity and carries out crowded pier in lower mode cavity and operate, until it is complete to fill type;
S3, detach cushion block, take out lower punch and blank, complete the first passage processing;
S4, repetition step S1 ~ S3, realize multi-pass and back and forth squeeze pier.
5. back and forth crowded pier method as claimed in claim 4, is characterized in that, in step S2, described crowded pier operation comprises as the next stage:
Pier squeezes early stage, and blank fills type in upper impression, enters lower impressions by extrusion mouth simultaneously;
Blank lower impressions fill type complete after, occur without dead band crimp, until blank contact lower punch;
After blank contact lower punch, there is Upsetting, until it is complete to fill type in both sides flowing to the left and right under the effect of lower punch.
6. back and forth crowded pier method as claimed in claim 4, it is characterized in that, described multi-pass is back and forth squeezed pier process and is achieved by different machining paths.
7. back and forth crowded pier method as claimed in claim 6, it is characterized in that, described path comprises:
Path A, blank does not rotate between adjacent two passages;
Path B, blank is at adjacent its central axis half-twist of two passage spaced windings;
Path C, blank rotates 180 ° at adjacent two its central axis of passage spaced winding.
8. the purposes of a back and forth crowded gathering apparatus as claimed in claim 1 in simple metal, alloy, intermetallic compound, composite, macromolecular material, the preparation of semi-conducting material Ultra-fine Grained pie material.
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| CN201510300188.6A CN105033141B (en) | 2015-06-03 | 2015-06-03 | Back and forth crowded gathering apparatus and its application method and application |
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| CN201510300188.6A CN105033141B (en) | 2015-06-03 | 2015-06-03 | Back and forth crowded gathering apparatus and its application method and application |
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| CN105033141B CN105033141B (en) | 2017-07-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109663878A (en) * | 2018-12-26 | 2019-04-23 | 燕山大学 | Gradual warm upsetting-torsion replaces severe deformation method |
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| JP2002282931A (en) * | 2001-03-26 | 2002-10-02 | Kobe Steel Ltd | Extrusion device, extrusion method and extrusion control method |
| CN2768921Y (en) * | 2004-12-29 | 2006-04-05 | 上海交通大学 | Repeated upsetting extruding die for producing ultra-fine grained material |
| CN201088982Y (en) * | 2007-10-18 | 2008-07-23 | 上海交通大学 | Reciprocating extrusion device for preparing ultra-fine crystal material |
| CN101509116A (en) * | 2008-05-12 | 2009-08-19 | 昆明理工大学 | Method for producing ultra-fine grain by using repeated forging of large deformation |
| CN203917441U (en) * | 2014-05-30 | 2014-11-05 | 太原科技大学 | The device of the rough standby block body ultrafine grain metal material of reciprocating extrusion pier |
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2015
- 2015-06-03 CN CN201510300188.6A patent/CN105033141B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002282931A (en) * | 2001-03-26 | 2002-10-02 | Kobe Steel Ltd | Extrusion device, extrusion method and extrusion control method |
| CN2768921Y (en) * | 2004-12-29 | 2006-04-05 | 上海交通大学 | Repeated upsetting extruding die for producing ultra-fine grained material |
| CN201088982Y (en) * | 2007-10-18 | 2008-07-23 | 上海交通大学 | Reciprocating extrusion device for preparing ultra-fine crystal material |
| CN101509116A (en) * | 2008-05-12 | 2009-08-19 | 昆明理工大学 | Method for producing ultra-fine grain by using repeated forging of large deformation |
| CN203917441U (en) * | 2014-05-30 | 2014-11-05 | 太原科技大学 | The device of the rough standby block body ultrafine grain metal material of reciprocating extrusion pier |
Non-Patent Citations (1)
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| A．Φ．别洛夫等: "《铝合金半成品生产》", 31 July 1982 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109663878A (en) * | 2018-12-26 | 2019-04-23 | 燕山大学 | Gradual warm upsetting-torsion replaces severe deformation method |
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| CN105033141B (en) | 2017-07-11 |
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