CN103894436A - Reciprocating extruding device and machining method of reinforced magnesium alloy tube - Google Patents

Reciprocating extruding device and machining method of reinforced magnesium alloy tube Download PDF

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Publication number
CN103894436A
CN103894436A CN201410118531.0A CN201410118531A CN103894436A CN 103894436 A CN103894436 A CN 103894436A CN 201410118531 A CN201410118531 A CN 201410118531A CN 103894436 A CN103894436 A CN 103894436A
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China
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extrusion ring
magnesium
press bar
extruding
fixed press
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CN201410118531.0A
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Chinese (zh)
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CN103894436B (en
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张华�
程伟丽
樊建锋
许并社
董洪标
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太原理工大学
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Abstract

The invention relates to a reciprocating extruding device and a machining method of a reinforced magnesium alloy tube, belongs to the field of plastic machining of nonferrous metals. The reciprocating extruding device comprises an upper extruding ring, a lower extruding ring, an upper fixed extruding rod, a lower fixed extruding rod, an extruding cylinder mold and a necking region, wherein the extruding cylinder mold is divided into an upper mold cavity and a lower mold cavity by the necking region, and a heating sleeve is arranged on the outer wall of the extruding cylinder mold; the upper extruding ring and the lower extruding ring are respectively arranged at the peripheries of the upper fixed extruding rod and the lower fixed extruding rod and are respectively arranged in the upper mold cavity and the lower mold cavity, the upper extruding ring and the upper fixed extruding rod are connected with an upper hydraulic stretching cavity, and the lower extruding ring and the lower fixed extruding rod are connected with a lower hydraulic stretching cavity. The reciprocating extruding device has the beneficial effects that the tensile strength of the magnesium alloy tube machined by virtue of the reciprocating extruding device can reach 500MPa, and an extruding mold is simple in structure and strong in operability of extrusion deformation and can realize continuous extrusion deformation, so that the production cost is relatively low, and the production efficiency is high.

Description

A kind of reciprocating extrusion device and processing method that strengthens magnesium-alloy tube

Technical field

What the present invention relates to is a kind of reciprocating extrusion device and processing method that strengthens magnesium-alloy tube, belongs to non-ferrous metal plastic working and the technical field that increases mechanical property.

Background technology

Along with the development of Aero-Space, communications and transportation and information industry, magnesium alloy is becoming continue traditional iron and steel and the later the third-largest structural metallic materials of aluminum alloy materials, and is referred to as " 21 century green engineering material ".But magnesium alloy strength is low, hardness is low, plasticity is poor and corrosion-resistant, cause its commercial Application to be very restricted, must strengthen processing to magnesium alloy, could expand its scope of application and application.

Severe plastic deformation technology (being called for short SPD) can be by magnesium alloy grains to even nanoscale of sub-micron, is current conventional magnesium alloy enhancing technology.Conventional SPD technology has reciprocating extrusion, Equal-channel Angular Pressing, high pressure torsion, jerk etc., but these methods only can be prepared ultra-fine grained magnesium alloy block materials, cannot meet the day by day strong market demand to magnesium alloy pipe, its application is very limited.In order to adapt to the current market demand to high-strength magnesium alloy tube, be necessary to research and develop the enhancing technology of simple, the workable magnesium alloy pipe of a kind of technique.

Summary of the invention

The object of the invention is the situation for background technology, a kind of reciprocating extrusion device and processing method that strengthens magnesium-alloy tube is provided.By the reciprocating extruding of ring-type, magnesium-alloy tube is carried out to multi-pass processing, realize the continuous modification of " magnesium closes pipe-magnesium alloy piece-magnesium-alloy tube ", prepare that crystal grain is tiny, the high-strength magnesium alloy pipe of even tissue, tensile strength can reach 500MPa, and cost is lower, production efficiency is higher.

The present invention is achieved by the following technical solutions:

The present invention relates to a kind of ring-type reciprocating extrusion processing unit (plant), comprising: upper and lower extrusion ring, upper and lower fixed press bar, recipient mould, necking down district, wherein: recipient mould is divided into upper and lower die cavity by necking down district, described recipient mould outer wall is provided with heating jacket.Upper and lower extrusion ring is separately positioned on upper and lower fixed press bar periphery, and is placed in respectively in upper and lower film chamber, and described upper extrusion ring, upper fixed press bar and lower extrusion ring, lower fixed press bar are connected with upper and lower hydraulically extensible chamber respectively.

Described upper and lower extrusion ring cross section is annular, and size is equal, and fits with upper fixed press bar, upper cavity and lower fixed press bar, lower mode cavity respectively.Described upper and lower fixed press bar cross section is circular, and size equates.Described necking down district is circular, and internal diameter is less than recipient mould internal diameter, and cross section is that rectangle and each angle are smooth rounding.Described upper and lower die cavity internal diameter equates.

A kind of magnesium-alloy tube reciprocating extrusion processing method that strengthens, its concrete steps comprise:

(1) reciprocating extrusion device is installed on hydraulic extrusion press, installs firmly, each portion position, it is correct that annexation is wanted, according to the order of sequence operation;

(2) magnesium alloy pipe blank is placed in to heating furnace, carries out preheating, preheat temperature is 300 ℃~400 ℃, under preheat temperature, is incubated 1 hour;

(3) open heating jacket, heating recipient mould, extrusion ring and fixed press bar, heating-up temperature is preset as 300 ℃~400 ℃, is incubated 30 minutes in the time reaching preset temperature;

(4) exit extrusion ring and upper fixed press bar, the magnesium alloy pipe blank after preheating is placed in the upper cavity of recipient mould, upper extrusion ring and upper fixed press bar are stretched in recipient upper mould chamber, and contact magnesium alloy pipe blank;

(5) add and press extrusion ring and make it descending, pressure is 400MPa~700MPa, the magnesium alloy pipe blank being placed in advance in upper cavity is pushed, it is entered in lower mode cavity by necking down district, in the time that blank contacts with the lower extrusion ring in lower mode cavity, increase the nip pressure of upper extrusion ring, pressure is 800MPa~1000MPa, with extrusion ring at present, blank is oppositely applied to back pressure, pressure is 200MPa~300MPa, enters lower mode cavity completely to blank, stop advancing, complete a second processing;

(6) extrusion ring and lower extrusion ring in reverse drive, main pressure pressure is 800MPa~1000MPa, back pressure pressure is 200MPa~300MPa, blank lower extrusion ring be main pressure, on enter upper cavity by lower mode cavity under the extrusion ring effect that is back pressure, complete two passages processing;

(7) repeating above-mentioned steps (4) and step (5) is at least to realize the continuous reciprocating extrusion processing of magnesium-alloy tube for 2 times;

(8) exit extrusion ring, lower extrusion ring and upper fixed press bar, lower fixed press bar, take out the magnesium-alloy tube after reciprocating extrusion, make it cooling in air, excision waste material; Clearing up mould and coating next machining needs lubricant, completes processing; Obtain that crystal grain is tiny, the high-strength magnesium alloy pipe of even tissue.

The present invention has obvious advance compared with background technology, the situation lower for magnesium-alloy tube intensity, compress into row processing by ring-type reciprocating extruding, realize the continuous modification of " magnesium closes pipe-magnesium alloy piece-magnesium-alloy tube ", complete and obtain that crystal grain is tiny, the high-strength magnesium alloy pipe of even tissue after corresponding extruding passage, the tensile strength of the magnesium-alloy tube of the present invention's processing can reach 500MPa, and this tubing can meet the current market demand to high-strength magnesium alloy tube.And structure of extrusion is simple, crimp workable, can realize continuous extrusion deformation, therefore production cost is relatively low, production efficiency is higher.

Accompanying drawing explanation

In order to be illustrated more clearly in the present invention, below in conjunction with accompanying drawing, embodiment is briefly described.

Fig. 1 is the structural representation of magnesium-alloy tube reciprocating extrusion deformation device in the present invention.

Fig. 2 is the generalized section of extrusion die passage.

Fig. 3 be in Fig. 2 A-A to cutaway view.

Fig. 4 be in Fig. 2 B-B to cutaway view.

In figure: 1. go up extrusion ring, 2. descend extrusion ring, 3. go up fixed press bar, 4. descend fixed press bar, 5. heating jacket, 6. recipient mould, 7. necking down district, 8. upper cavity, 9. lower mode cavity, 10. magnesium alloy blank, on 11. hydraulically extensible chamber, 12. times hydraulically extensible chambeies.

The specific embodiment

Below in conjunction with accompanying drawing, the invention will be further described: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

As shown in Figure 1, the pressurizing unit that the present embodiment relates to mainly comprises: go up extrusion ring 1., 2. descend extrusion ring, 3. go up fixed press bar, 4. descend fixed press bar, 5. heating jacket, 6. recipient mould, 7. necking down district, wherein: recipient mould 6 is divided into upper and lower die cavity 8,9 by necking down district 7, described recipient mould 6 outer walls are provided with heating jacket 5.Upper and lower extrusion ring 1,2 is separately positioned on upper and lower fixed press bar 3,4 peripheries, and is placed in respectively in upper and lower film chamber 8,9, and described upper and lower extrusion ring 1,2 is connected with upper and lower hydraulically extensible chamber 11,12 respectively with upper and lower fixed press bar 3,4.

As shown in Figure 2,3, 4, described upper and lower extrusion ring 1,2 cross sections are annular, and size is equal, and fit with upper fixed press bar 3, upper cavity 8 and lower fixed press bar 4, lower mode cavity 9 respectively.Described upper and lower fixed press bar 3,4 cross sections are circular, and size equates.Described necking down district 7 is circular, and internal diameter is less than recipient mould 6 internal diameters, and cross section is that rectangle and each angle are smooth rounding.Described upper and lower die cavity 8,9 internal diameters equate.

The processing method of the ring-type reciprocating extrusion device of enhancing magnesium-alloy tube of the present invention, carry out according to the following steps:

(1) reciprocating extrusion device is installed on hydraulic extrusion press, installs firmly, each portion position, it is correct that annexation is wanted, according to the order of sequence operation;

(2) magnesium alloy pipe blank 10 is placed in to heating furnace, carries out preheating, preheat temperature is 300 ℃~400 ℃, under preheat temperature, is incubated 1 hour;

(3) open heating jacket 5, heating recipient mould 6, upper and lower extrusion ring 1,2 and upper and lower fixed press bar 3,4, heating-up temperature is preset as 300 ℃~400 ℃, is incubated 30 minutes in the time reaching preset temperature;

(4) exit extrusion ring 1 and upper fixed press bar 3, magnesium alloy pipe blank 10 after preheating is placed in the upper cavity 8 of recipient mould 6, again upper extrusion ring 1 is stretched in recipient upper mould chamber 8 with upper fixed press bar 3, and contact magnesium alloy pipe blank 10;

(5) add and press extrusion ring 1 and make it descending, pressure is 400MPa~700MPa, the magnesium alloy pipe blank 10 being placed in advance in upper cavity 8 is pushed, it is entered in lower mode cavity 9 by necking down district 7, in the time that contacting with the lower extrusion ring 2 in lower mode cavity 9, blank 10 increases the nip pressure of upper extrusion ring 1, pressure is 800MPa~1000MPa, same extrusion ring 2 at present oppositely applies back pressure to blank 10, pressure is 200MPa~300MPa, enter lower mode cavity 9 completely to blank 10, stop advancing, complete a second processing;

(6) extrusion ring 1 and lower extrusion ring 2 in reverse drive, main pressure pressure is 800MPa~1000MPa, back pressure pressure is 200MPa~300MPa, blank 10 lower extrusion ring 2 be main pressure, on extrusion ring be to enter upper cavity 8 by lower mode cavity 9 under the effect of 1 back pressure, complete two passages processing;

(7) repeating above-mentioned steps (4) is at least to realize the continuous reciprocating extrusion processing of magnesium-alloy tube for 2 times with step (5);

(8) exit upper and lower extrusion ring 1,2 and upper and lower fixed press bar 3,4, take out the magnesium-alloy tube 10 after reciprocating extrusion, make it cooling in air, excision waste material.Clearing up mould and coating next machining needs lubricant, completes processing.

Embodiment

Get the raw materials ready magnesium alloy billet car gone to surface part, be processed into internal diameter than the large 0.1mm of fixed press shank diameter, external diameter than the little 0.1mm pipe of recipient mould internal diameter blank, and remove surface and oil contaminant, then put into 350 ℃ of heating furnaces, be incubated 1 hour;

First reciprocating extrusion device is installed on hydraulic extrusion press, installs firmly, connect correctly, and open heating jacket 4, add hot-extrusion mold, in the time reaching 350 ℃, be incubated 30 minutes.

Then start hydraulic extrusion press, exit extrusion ring 1 and upper fixed press bar 3, magnesium alloy pipe blank 10 after preheating is placed in the upper cavity 8 of recipient mould 6, upper extrusion ring 1 is stretched in recipient upper mould chamber 8 with upper fixed press bar 3, and contact magnesium alloy pipe blank 10;

Then add and press extrusion ring 1 to make its nip pressure be 600MPa, the magnesium alloy pipe blank 10 being placed in advance in upper cavity 8 is pushed, blank 10 is entered in lower mode cavity 9 by necking down district 7, the nip pressure that increases upper extrusion ring 1 in the time that blank 10 contacts with the lower extrusion ring 2 in lower mode cavity 9 is to 900MPa, same extrusion ring 2 at present oppositely applies to blank 10 back pressure that pressure is 200MPa, enter lower mode cavity 9 completely to blank 10, stop advancing, complete a second processing;

Extrusion ring 1 and lower extrusion ring 2 in reverse drive, the nip pressure of upper and lower extrusion ring 1,2 is transformed to respectively 900MPa and 200MPa, blank 10 lower extrusion ring 2 be main pressure, on extrusion ring be to enter upper cavity 8 by lower mode cavity 9 under the effect of 1 back pressure, complete two passages processing;

Go round and begin again, until complete eight reciprocating extrusion distortion, exit upper and lower extrusion ring 1,2 and upper and lower fixed press bar 3,4, take out the magnesium-alloy tube 10 after reciprocating extrusion, make it cooling in air, excision waste material.Obtain even tissue, ultra-fine grained magnesium alloy pipe that intensity is higher, tensile strength can reach 500MPa.

Claims (6)

1. strengthen a processing method for magnesium-alloy tube, comprise the reciprocating extrusion device that strengthens magnesium-alloy tube, it is characterized in that comprising the steps:
(1) reciprocating extrusion processing unit (plant) is installed on hydraulic extrusion press, installs firmly, each portion position, it is correct that annexation is wanted, according to the order of sequence operation;
(2) magnesium alloy pipe blank is placed in to heating furnace, carries out preheating, preheat temperature is 300 ℃~400 ℃, under preheat temperature, is incubated 1 hour;
(3) open heating jacket, heating recipient mould, extrusion ring and fixed press bar, heating-up temperature is preset as 300 ℃~400 ℃, is incubated 30 minutes in the time reaching preset temperature;
(4) exit extrusion ring and upper fixed press bar, the magnesium alloy pipe blank after preheating is placed in the upper cavity of recipient mould, upper extrusion ring and upper fixed press bar are stretched in recipient upper mould chamber, and contact magnesium alloy pipe blank;
(5) add and press extrusion ring and make it descending, pressure is 400MPa~700MPa, the magnesium alloy pipe blank being placed in advance in upper cavity is pushed, it is entered in lower mode cavity by necking down district, in the time that contacting with the lower extrusion ring in lower mode cavity, magnesium alloy pipe blank increases the nip pressure of upper extrusion ring, pressure is 800MPa~1000MPa, same extrusion ring at present oppositely applies back pressure to magnesium alloy pipe blank, pressure is 200MPa~300MPa, enter lower mode cavity completely to blank, stop advancing, complete a second processing;
(6) extrusion ring and lower extrusion ring in reverse drive, making lower extrusion ring is main pressure, upper extrusion ring is back pressure, main pressure pressure is 800MPa~1000MPa, back pressure pressure is 200MPa~300MPa, magnesium alloy pipe blank lower extrusion ring be main pressure, on enter upper cavity by lower mode cavity under the extrusion ring effect that is back pressure, complete two passages processing;
(7) circulation above-mentioned steps (5) and step (6) are at least to realize the continuous reciprocating extrusion processing of magnesium-alloy tube for 2 times;
(8) exit extrusion ring, lower extrusion ring and upper fixed press bar, lower fixed press bar, take out the magnesium-alloy tube after reciprocating extrusion, make it cooling in air, excision waste material; Clearing up mould and coating next machining needs lubricant, completes processing; Obtain that crystal grain is tiny, the high-strength magnesium alloy pipe of even tissue, tensile strength can reach 500MPa.
2. a kind of processing method that strengthens magnesium-alloy tube according to claim 1, the reciprocating extrusion device that it is characterized in that described enhancing magnesium-alloy tube comprises: upper extrusion ring, lower extrusion ring, upper fixed press bar, lower fixed press bar, recipient mould, necking down district, wherein: recipient mould is divided into upper cavity, lower mode cavity by necking down district, described recipient mould outer wall is provided with heating jacket; Upper extrusion ring, lower extrusion ring are separately positioned on fixed press bar, lower fixed press bar periphery, and be placed in respectively in film chamber, bottom film chamber, described upper extrusion ring, upper fixed press bar and lower extrusion ring, lower fixed press bar are connected with upper hydraulically extensible chamber, lower hydraulically extensible chamber respectively.
3. a kind of processing method that strengthens magnesium-alloy tube according to claim 1 and 2, it is characterized in that described upper extrusion ring, lower extrusion ring cross section are annular, and size equates, and fits with upper fixed press bar, upper cavity and lower fixed press bar, lower mode cavity respectively.
4. a kind of processing method that strengthens magnesium-alloy tube according to claim 1 and 2, it is characterized in that fixed pressure ram, lower fixed press bar cross section are for circular, and size equates.
5. a kind of processing method that strengthens magnesium-alloy tube according to claim 1 and 2, is characterized in that described necking down district is circular, and internal diameter is less than recipient mould internal diameter, and cross section is that rectangle and each angle are smooth rounding.
6. a kind of processing method that strengthens magnesium-alloy tube according to claim 1 and 2, is characterized in that described upper cavity internal diameter equates with lower mode cavity internal diameter.
CN201410118531.0A 2014-03-27 2014-03-27 A kind of reciprocating extrusion device and processing method strengthening magnesium-alloy tube CN103894436B (en)

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
CN104624692A (en) * 2015-02-03 2015-05-20 重庆电讯职业学院 Extruding forming mould system of magnesium alloy material and less-residue and residue-free extruding forming method
CN104801557A (en) * 2015-05-05 2015-07-29 太原理工大学 Isovolumetric reciprocating extrusion device and machining method for enhanced magnesium alloy plate
CN104801558A (en) * 2015-05-05 2015-07-29 太原理工大学 Machining method of enhanced magnesium-aluminum laminar composite tubular product
CN105537307A (en) * 2015-12-11 2016-05-04 上海交通大学 Continuous shearing and reciprocating reverse extrusion combined type machining device and method for preparing pipes
CN106607468A (en) * 2017-01-07 2017-05-03 中北大学 Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece
CN107096802A (en) * 2017-06-30 2017-08-29 天津工业大学 The big Plastic Forming mould and its manufacturing process of a kind of tubing
CN107138547A (en) * 2017-05-05 2017-09-08 太原理工大学 It is a kind of to strengthen the reciprocal backward extrusion processing method of magnesium alloy pipe
CN107282671A (en) * 2017-07-21 2017-10-24 合肥工业大学 The blanking type variable cross-section of ultra fine grained steel bar back and forth squeezes and turns round upsetting manufacturing process
CN107774732A (en) * 2017-10-27 2018-03-09 西南交通大学 A kind of method that reciprocating extrusion prepares nanometer quasi-crystalline substance enhancing Mg Zn y alloys
CN107931350A (en) * 2017-12-26 2018-04-20 中国兵器工业第五九研究所 A kind of Tapered Cup back and forth fluctuates extrusion molding design method
CN108856326A (en) * 2018-06-15 2018-11-23 哈尔滨吉星机械工程有限公司 The device and method of metal-base composites is prepared based on the reciprocating extruding of semisolid
CN109821917A (en) * 2019-02-26 2019-05-31 佛山市赛立新机械设备制造有限公司 A kind of extruder quick die change device
CN109821918A (en) * 2019-02-26 2019-05-31 佛山市赛立新机械设备制造有限公司 A kind of extruder replacement die device
CN110508635A (en) * 2019-08-27 2019-11-29 太原理工大学 A kind of asymmetric reciprocating extrusion device and processing method with separate type punch-pin

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104624692A (en) * 2015-02-03 2015-05-20 重庆电讯职业学院 Extruding forming mould system of magnesium alloy material and less-residue and residue-free extruding forming method
CN104801557A (en) * 2015-05-05 2015-07-29 太原理工大学 Isovolumetric reciprocating extrusion device and machining method for enhanced magnesium alloy plate
CN104801558A (en) * 2015-05-05 2015-07-29 太原理工大学 Machining method of enhanced magnesium-aluminum laminar composite tubular product
CN105537307A (en) * 2015-12-11 2016-05-04 上海交通大学 Continuous shearing and reciprocating reverse extrusion combined type machining device and method for preparing pipes
CN106607468A (en) * 2017-01-07 2017-05-03 中北大学 Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece
CN107138547A (en) * 2017-05-05 2017-09-08 太原理工大学 It is a kind of to strengthen the reciprocal backward extrusion processing method of magnesium alloy pipe
CN107096802A (en) * 2017-06-30 2017-08-29 天津工业大学 The big Plastic Forming mould and its manufacturing process of a kind of tubing
CN107096802B (en) * 2017-06-30 2018-09-28 天津工业大学 A kind of big Plastic Forming mold and its manufacturing process of tubing
CN107282671A (en) * 2017-07-21 2017-10-24 合肥工业大学 The blanking type variable cross-section of ultra fine grained steel bar back and forth squeezes and turns round upsetting manufacturing process
CN107774732A (en) * 2017-10-27 2018-03-09 西南交通大学 A kind of method that reciprocating extrusion prepares nanometer quasi-crystalline substance enhancing Mg Zn y alloys
CN107931350A (en) * 2017-12-26 2018-04-20 中国兵器工业第五九研究所 A kind of Tapered Cup back and forth fluctuates extrusion molding design method
CN107931350B (en) * 2017-12-26 2019-06-14 中国兵器工业第五九研究所 A kind of Tapered Cup back and forth fluctuates extrusion molding design method
CN108856326A (en) * 2018-06-15 2018-11-23 哈尔滨吉星机械工程有限公司 The device and method of metal-base composites is prepared based on the reciprocating extruding of semisolid
CN109821917A (en) * 2019-02-26 2019-05-31 佛山市赛立新机械设备制造有限公司 A kind of extruder quick die change device
CN109821918A (en) * 2019-02-26 2019-05-31 佛山市赛立新机械设备制造有限公司 A kind of extruder replacement die device
CN110508635A (en) * 2019-08-27 2019-11-29 太原理工大学 A kind of asymmetric reciprocating extrusion device and processing method with separate type punch-pin

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