CN107855394B - A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member - Google Patents

A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member Download PDF

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Publication number
CN107855394B
CN107855394B CN201711079628.5A CN201711079628A CN107855394B CN 107855394 B CN107855394 B CN 107855394B CN 201711079628 A CN201711079628 A CN 201711079628A CN 107855394 B CN107855394 B CN 107855394B
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spinning
magnesium alloy
mandrel
spinning machine
alloy blank
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CN107855394A (en
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徐文臣
靳学泽
杨川
单德彬
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14Spinning
    • B21D22/16Spinning over shaping mandrels or formers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/16Heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/18Lubricating, e.g. lubricating tool and workpiece simultaneously

Abstract

A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member, the present invention relates to cylindrical member intensifying method fields.The invention solves the Mg alloy thin wall cylindrical members of traditional magnesium alloy spinning process preparation to be also easy to produce apparent anisotropy, leads to the technical issues of circumferential tensile strength of Mg alloy thin wall cylindrical member is lower than axial tensile-strength.Method includes: Step 1: fixed magnesium alloy blank, preheating;Step 2: being preheated to spinning temperature;Step 3: starting spinning machine carries out shear spinning;Step 4: the mandrel for changing spinning machine turns to, preheating sprays lubricant, carries out lower a time shear spinning;Step 5: repeating step 4 until obtaining the Mg alloy thin wall cylindrical member of target size.Method of the invention can be used for the spin-forming procedure of Mg alloy thin wall cylindrical member, can effectively improve the circumferential mechanical property of mould pressing part.

Description

A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member
Technical field
The present invention relates to cylindrical member intensifying method fields.
Background technique
With the raising to loss of weight power conservation requirement, light thin-wall revolving body member obtains in fields such as automobile, aerospaces It is more and more widely used.But during actual military service, not requiring nothing more than barrel-type casing component has very high size essence Degree, while the ability for requiring component that there is certain receiving internal pressure.And the most weak direction of performance is in limitation barrel-type casing component The short slab of bearing capacity.Therefore, the anisotropy for reducing barrel-type casing component improves the comprehensive mechanical property of component, improves cylinder Shape component internal pressure bearing capacity, has important practical significance for component lightweight.Magnesium alloy is most light metal structure material One of material, has broad application prospects.But since magnesium alloy is close-packed hexagonal structure, deformation pattern is less, low-temperature deformation When often form the very strong texture along tubing radial direction, and be difficult to eliminate using heat treatment mode merely.Therefore, how to pass through Changing spinning process method reduces the texture intensity of spinning tubing, is a urgent problem to be solved.
Currently, shear spinning is forming one of highly effective method of Mg alloy thin wall cylindrical member, this method tooling is simple, High efficient and flexible, stock utilization are high, and thin-wall tube-shaped element formed thereby has good comprehensive performance, lead in aerospace and weapons It is used widely in domain.But at present using the thin-wall tube-shaped element of traditional multi-pass single direction strong spinning process manufacture relative to Initial pipe circumferential direction strengthening effect generates apparent anisotropy on thin-wall tube-shaped element, limits magnesium alloy thin lower than axially Wall cylindrical member military service performance.
Summary of the invention
The invention solves the Mg alloy thin wall cylindrical member of traditional magnesium alloy spinning process preparation be also easy to produce it is apparent respectively to The opposite sex leads to the technical issues of circumferential tensile strength of Mg alloy thin wall cylindrical member is lower than axial tensile-strength, provides a kind of magnesium The intersection spinning intensifying method of alloy thin-wall cylindrical member.
A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member of the present invention sequentially includes the following steps:
Step 1: magnesium alloy blank is covered on the mandrel of spinning machine and is fixed, by the mandrel of spinning machine and magnesium alloy base Material preheating, then in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface even application lubricant;
It is described that the mandrel of spinning machine and magnesium alloy blank are preheated to 150 DEG C;
The material of steel used in the spinning roller of the spinning machine and the mandrel of press is 4Cr5MoSiV1;
Described cover magnesium alloy blank is transition between magnesium alloy blank and the mandrel of press when on the mandrel of spinning machine Cooperation;
The lubricant sprayed in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface is water-based graphite lubrication Agent;
Step 2: the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank are preheated to spinning temperature;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 200~450 DEG C;The spinning roller of the spinning machine Spinning temperature is 100~150 DEG C;
Step 3: starting spinning machine carries out shear spinning;
Step 4: the mandrel for changing spinning machine turns to, and the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank is pre- Heat is to spinning temperature;Carry out lower a time shear spinning;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 200~450 DEG C;The spinning roller of the spinning machine Spinning temperature is 100~150 DEG C;
Step 5: step 4 is repeated until obtaining the Mg alloy thin wall cylindrical member of target size.
The beneficial effects of the present invention are:
One, it is evenly distributed using magnesium alloy spinning cylindrical member tissue microstructure produced by the invention, crystallite dimension is more It is tiny.Since two passage spinning direction of front and back has certain angle, rear a time rotary pressure deformation can produce preceding a time tissue Raw stronger shear action, so that tissue is relative to traditional cylindrical member multi-pass shear spinning, (mandrel rotates when each passage spinning Direction does not change) obtain stronger thinning effect.
Two, have using magnesium alloy spinning cylindrical member intensity produced by the invention and be obviously improved.The method of the present invention intersects rotation During molded, alloy blank alloy blank length under the extruding of the spinning roller of spinning machine increases, the wall thickness of alloy blank by Gradual change is thin, and the spinning roller contact portion of the surface of alloy blank and spinning machine will form helical form spinning track after each spinning;Change After the mandrel of mutarotation press turns to, the spiral for the track that the spiral trajectory on the surface of alloy blank and upper a time spinning generate Direction is different, i.e., after multiple spinning, the surface of alloy blank can generate the spinning track of cross network;Since refined crystalline strengthening is made With so that axially and radially mechanics performance is improved magnesium alloy spinning cylindrical member simultaneously.
Three, it is reduced using magnesium alloy spinning cylindrical member anisotropy produced by the invention.Due to rear a time and it is preceding together Secondary spinning is angled, the microstructure texture that a time is formed before rear a time deformation can destroy, so that magnesium alloy spinning tubular Part texture attenuation, anisotropy reduce.
Process of the invention uses for reference the principle of tandem rolling, passes through the rotation of mandrel during change multi-pass spinning Direction, changes the interaction mode in spinning process between spinning roller and blank, and organization of regulation control feature and texture distribution of orientations are special Sign, improve the circumferential intensity of revolving parts, improve the structure property uniformity of thin-wall tube-shaped element, weaken spinning part respectively to The opposite sex, this is highly beneficial to the internal pressure bearing capacity and military service performance that improve thin-wall tube-shaped element.Method of the invention is available In the spin-forming procedure of Mg alloy thin wall cylindrical member, the circumferential mechanical property of mould pressing part can effectively improve.This hair It is bright to regulate and control Magnesium Alloy feature and texture distribution of orientations feature to strengthen cylindrical member circumferential direction performance, improve cylindrical member respectively to Anisotropic bidirectional crossed spinning process method.Do not changed using mandrel direction of rotation during method and conventional spun of the invention Spinning process compare, the method for the present invention obtains intersecting spinning cylindrical member circumferential direction anti-when spinning reduction reaches 85% or so Tensile strength improves 5~10% compared to highest than conventional spun technique.
The present invention is used for the intersection rotary press modelling of Mg alloy thin wall cylindrical member.
Detailed description of the invention
Fig. 1 is the intersection spinning strengthening process schematic diagram of Mg alloy thin wall cylindrical member of the present invention;In figure 1 be spinning machine core Axis, 2 be magnesium alloy blank, and 3 be the spinning roller of spinning machine;
Fig. 2 is to close after adjacent passage spinning in magnesium in the intersection spinning strengthening process of Mg alloy thin wall cylindrical member of the present invention The spinning track and spinning course bearing schematic diagram that golden blank surface generates.
Specific embodiment
Technical solution of the present invention is not limited to the specific embodiment of act set forth below, further include each specific embodiment it Between any combination.
Specific embodiment 1: a kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member of present embodiment, by with Lower step carries out:
Step 1: magnesium alloy blank is covered on the mandrel of spinning machine and is fixed, by the mandrel of spinning machine and magnesium alloy base Material preheating, then in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface even application lubricant;
Step 2: the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank are preheated to spinning temperature;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 200~450 DEG C;The spinning roller of the spinning machine Spinning temperature is 100~150 DEG C;
Step 3: starting spinning machine carries out shear spinning;
Step 4: the mandrel for changing spinning machine turns to, and the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank is pre- Heat is to spinning temperature;In magnesium alloy blank outer surface even application lubricant, lower a time shear spinning is carried out;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 200~450 DEG C;The spinning roller of the spinning machine Spinning temperature is 100~150 DEG C;
Step 5: step 4 is repeated until obtaining the Mg alloy thin wall cylindrical member of target size.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: by spinning described in step 1 The mandrel of machine is preheated to 150 DEG C.It is other same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: it will described in step 1 Magnesium alloy blank is preheated to 150 DEG C.It is other the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: institute in step 1 The material for stating steel used in the spinning roller of spinning machine is 4Cr5MoSiV1.It is other identical as one of specific embodiment one to three.
Specific embodiment 5: unlike one of present embodiment and specific embodiment one to four: institute in step 1 The material for stating steel used in the mandrel of press is 4Cr5MoSiV1.It is other identical as one of specific embodiment one to four.
Specific embodiment 6: unlike one of present embodiment and specific embodiment one to five: described in step 1 It is transition fit between magnesium alloy blank and the mandrel of press when on the mandrel of spinning machine that magnesium alloy blank, which is covered,.Other and tool One of body embodiment one to five is identical.
Specific embodiment 7: unlike one of present embodiment and specific embodiment one to six: described in step 1 It is water-based graphite in the lubricant that the mandrel outer surface of spinning machine sprays.It is other identical as one of specific embodiment one to six.
Specific embodiment 8: unlike one of present embodiment and specific embodiment one to seven: described in step 1 Lubricant in magnesium alloy blank outer surface is water-based graphite.It is other identical as one of specific embodiment one to seven.
Specific embodiment 9: unlike one of present embodiment and specific embodiment one to eight: described in step 2 200~400 DEG C of spinning temperature of the mandrel of spinning machine and magnesium alloy blank.Other phases one of with specific embodiment one to eight Together.
Specific embodiment 10: unlike one of present embodiment and specific embodiment one to nine: described in step 4 200~400 DEG C of spinning temperature of the mandrel of spinning machine and magnesium alloy blank.Other phases one of with specific embodiment one to nine Together.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment one:
A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member of the present embodiment, sequentially includes the following steps:
Step 1: magnesium alloy blank is covered on the mandrel of spinning machine and is fixed, by the mandrel of spinning machine and magnesium alloy base Material preheating, then in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface even application lubricant;
It is described that the mandrel of spinning machine and magnesium alloy blank are preheated to 150 DEG C;
The material of steel used in the spinning roller of the spinning machine and the mandrel of press is 4Cr5MoSiV1;
Described cover magnesium alloy blank is transition between magnesium alloy blank and the mandrel of press when on the mandrel of spinning machine Cooperation;
The lubricant sprayed in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface is water-based graphite lubrication Agent;
Step 2: the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank are preheated to spinning temperature;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 300 DEG C;The spinning of the spinning roller of the spinning machine Temperature is 150 DEG C;
Step 3: starting spinning machine carries out shear spinning;
Step 4: the mandrel for changing spinning machine turns to, and the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank is pre- Heat is to spinning temperature;In magnesium alloy blank outer surface even application lubricant, lower a time shear spinning is carried out;
The mandrel of the spinning machine and the spinning temperature of magnesium alloy blank are 300 DEG C;The spinning of the spinning roller of the spinning machine Temperature is 150 DEG C;
Step 5: step 4 is repeated until obtaining the Mg alloy thin wall cylindrical member of target size.
The present embodiment has the advantages that
One, have using the circumferential intensity of the Mg alloy thin wall cylindrical member of the present embodiment production and be obviously improved.Utilize this reality The method of example is applied compared with the immovable spinning process in mandrel direction of rotation during conventional spun, the method for the present invention subtracts in spinning When thin rate reaches 85%, obtain intersecting spinning cylindrical member circumferential direction tensile strength than conventional spun technique compared to improving 10%;
Two, the present embodiment can weaken tubing radial deformation texture intensity;In the prior art, Mg alloy thin wall cylindrical member When reduction reaches 85%, the circumferential tensile strength of Mg alloy thin wall cylindrical member and the gap of axial tensile-strength are 10%, And the circumferential tensile strength of Mg alloy thin wall cylindrical member and the gap of axial tensile-strength of the present embodiment production are reduced to 5%; Illustrate that the Mg alloy thin wall cylindrical member anisotropy produced using the present embodiment is substantially reduced;
Three, the crystal grain ruler of the Mg alloy thin wall cylindrical member obtained by electron backscatter diffraction comparative analysis conventional spun Very little, in the identical situation of reduction, the average grain size for the Mg alloy thin wall cylindrical member that the present embodiment method obtains is less than Conventional spun technique;Illustrate that the tissue microstructure of the Mg alloy thin wall cylindrical member of the present embodiment production is evenly distributed, crystal grain ruler It is very little more tiny.

Claims (2)

1. a kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member, it is characterised in that: this method sequentially includes the following steps:
Step 1: covering magnesium alloy blank on the mandrel of spinning machine and fix, and the mandrel of spinning machine and magnesium alloy blank is pre- Heat, then in the mandrel outer surface of spinning machine and magnesium alloy blank outer surface even application lubricant;
Step 2: the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank are preheated to spinning temperature;The spinning machine The spinning temperature of mandrel and magnesium alloy blank is 300 DEG C;The spinning temperature of the spinning roller of the spinning machine is 150 DEG C;
Step 3: starting spinning machine carries out shear spinning;
Step 4: the mandrel for changing spinning machine turns to, and the mandrel of spinning machine, the spinning roller of spinning machine and magnesium alloy blank are preheated to Spinning temperature;In magnesium alloy blank outer surface even application lubricant, lower a time shear spinning is carried out;The core of the spinning machine The spinning temperature of axis and magnesium alloy blank is 300 DEG C;The spinning temperature of the spinning roller of the spinning machine is 150 DEG C;
Step 5: step 4 is repeated until obtaining the Mg alloy thin wall cylindrical member of target size;Magnesium alloy blank is in spinning machine Magnesium alloy blank length increases under the extruding of spinning roller, and the wall thickness of magnesium alloy blank is gradually thinning, after each spinning, magnesium alloy blank Surface and the contact portion of spinning machine spinning roller can generate spiral helicine spinning track, change after mandrel turns to, magnesium alloy blank The spiral trajectory on surface is different from upper a time spinning generation hand of spiral of track, after multiple spinning, in magnesium alloy base The surface of material will form the spinning trace of cross network;
The mandrel of spinning machine is preheated to 150 DEG C in step 1, magnesium alloy blank is preheated to 150 DEG C in step 1;Step 1 It is water-based graphite in the lubricant that the mandrel outer surface of spinning machine sprays;Lubricant of the step 1 in magnesium alloy blank outer surface be Water-based graphite;
The material of steel used in the spinning roller of spinning machine is 4Cr5MoSiV1 in step 1;
The material of steel used in the mandrel of spinning machine is 4Cr5MoSiV1 in step 1.
2. the intersection spinning intensifying method of Mg alloy thin wall cylindrical member according to claim 1, it is characterised in that: step 1 Described cover magnesium alloy blank is transition fit between magnesium alloy blank and the mandrel of press when on the mandrel of spinning machine.
CN201711079628.5A 2017-11-06 2017-11-06 A kind of intersection spinning intensifying method of Mg alloy thin wall cylindrical member Active CN107855394B (en)

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CN109985954A (en) * 2019-04-17 2019-07-09 华南理工大学 A kind of strong revolving shaping method of heat preparing magnesium alloy Power spinning

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