CN109702024B - Plastic processing method for fine-grain magnesium alloy pipe - Google Patents
Plastic processing method for fine-grain magnesium alloy pipe Download PDFInfo
- Publication number
- CN109702024B CN109702024B CN201811402746.XA CN201811402746A CN109702024B CN 109702024 B CN109702024 B CN 109702024B CN 201811402746 A CN201811402746 A CN 201811402746A CN 109702024 B CN109702024 B CN 109702024B
- Authority
- CN
- China
- Prior art keywords
- magnesium alloy
- laser
- blank
- head
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Forging (AREA)
- Extrusion Of Metal (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a plastic processing method of a fine-grain magnesium alloy pipe, belonging to the field of magnesium alloy pipe manufacturing. The method adopts a continuous local plastic forming process, and carries out laser local heating on the magnesium alloy tube blank in the deformation process; under the combined action of the strain gradient and the temperature gradient, the dynamic recrystallization of the magnesium alloy is promoted, the grain refinement of the pipe is realized, and the mechanical property of the pipe is improved. The invention has the advantages of good process stability, simple process equipment, short process flow and low production cost.
Description
Technical Field
The invention belongs to the field of magnesium alloy pipe manufacturing, and particularly relates to a plastic processing method of a fine-grain magnesium alloy pipe.
Background
As a structural material, under the condition of the same unit volume, the magnesium alloy has the minimum mass, and meanwhile, the material has the advantages of higher specific rigidity and specific strength, excellent electromagnetic shielding property and damping property, good thermal conductivity and dimensional stability, easy processing, forming and recycling and the like, and is known as 'green engineering metal in the 21 st century'. With the increasing application of magnesium alloy in the industries of transportation, electronic and electric appliances and the like, the research of magnesium alloy enters a brand new stage.
Although the magnesium resource is quite abundant, the mechanical property and deformability of the magnesium alloy become the bottleneck limiting the application and popularization of the magnesium alloy. Fine grain strengthening is to improve the mechanical properties of metal materials by refining grains, and is one of the main methods for strengthening magnesium alloys. At present, the preparation of the fine grain magnesium alloy is mainly carried out by adopting a large plastic deformation process, such as equal channel deformation extrusion, continuous multi-pass rolling and the like. The patent with publication number CN102925831A proposes to prepare fine-grain rare earth magnesium alloy plate by equal channel extrusion method, and the patent with publication number CN13196761161A proposes to prepare fine-grain magnesium alloy plate by static recrystallization of deformed structure induced by electric pulse current in the rolling process, but still has the problems of complex process and high production cost. In addition, the process mainly focuses on the manufacturing aspect of the fine-grain magnesium alloy plate, and a preparation method of the fine-grain magnesium alloy pipe is not shown. Patent publication No. CN107138548A proposes a method for forming an ultrafine grain magnesium alloy tube by adopting a reciprocating extrusion mode, but the forming process is complex, the adaptability of forming process equipment is poor, and the production efficiency is low.
Disclosure of Invention
In order to solve the problems of the prior art that the manufacturing aspect of the fine-grain magnesium alloy plate is mainly focused, the process is complex, the adaptability of process equipment is poor and the production cost is high, the invention provides a plastic processing method of the fine-grain magnesium alloy pipe, which adopts continuous local plastic forming, and simultaneously forms a local deformation area with temperature gradient and strain gradient on the magnesium alloy pipe blank through the rapid heating and rapid cooling of laser to promote the dynamic recrystallization of the magnesium alloy so as to obtain the fine-grain magnesium alloy pipe with uniform tissue and achieve the purpose of improving the strength and toughness of the magnesium alloy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a plastic processing method of a fine crystal magnesium alloy pipe comprises the following steps:
selecting geometric parameters and plastic processing parameters of a magnesium alloy tube blank according to the wall thickness requirement of a required finished magnesium alloy tube;
sleeving the magnesium alloy pipe blank on a mold, fixing the magnesium alloy pipe blank by using a fixing device so that the magnesium alloy pipe blank and the mold do not rotate relatively, and fixing the mold on a main shaft;
setting the initial processing position of the working head, setting the initial heating position and the angle of the laser heating head at the same time, keeping the initial heating position and the angle of the laser heating head at a preset distance delta in the axial direction of the spindle, and respectively setting the processing tracks of the laser heating head and the working head;
step four, setting laser heating parameters including defocusing amount and output power,
step five, setting plastic processing parameters including the main shaft rotating speed and the pass reduction rate;
step six, starting a main shaft to drive a mold to rotate, enabling a magnesium alloy tube blank to rotate along with the mold, enabling a laser to emit light, enabling an output laser beam to irradiate the surface of the magnesium alloy tube blank through a laser heating head, enabling a material to absorb the laser, forming a local heating area on the magnesium alloy tube blank, and enabling a working head to extrude the local heating area of the magnesium alloy tube blank; meanwhile, the temperature measuring device monitors the temperature of a local heating area, and the heating temperature of the material is controlled by changing the power of the laser;
feeding a laser heating head and a working head according to a preset track, continuously rotating the magnesium alloy tube blank along with the main shaft, continuously heating the magnesium alloy tube blank by the laser heating head, continuously rolling a local heating area on the magnesium alloy tube blank by the working head until the part to be processed of the magnesium alloy tube blank is formed, and stopping light emission by a laser;
step eight, repeating the step three to the step seven when multi-pass machining is adopted until the geometric dimension of the magnesium alloy tube blank meets the required requirement;
and step nine, cutting the undeformed region of the formed magnesium alloy pipe.
By adopting the technical scheme, the magnesium alloy tube blank is subjected to plastic processing by using a continuous local forming process, the magnesium alloy tube blank is locally heated by using laser in the processing process, and the magnesium alloy is promoted to be dynamically recrystallized under the combined action of the temperature gradient and the strain gradient, so that the crystal grains of the magnesium alloy tube blank are refined, and the mechanical property of the magnesium alloy tube blank is improved.
Furthermore, the grain size of the magnesium alloy pipe blank in the step one is less than 85 microns, and in order to reduce friction, a lubricant can be coated on the outer surface of the magnesium alloy pipe blank in the processing process.
Furthermore, the number of the working heads in the third step is not more than three, and if the number of the working heads exceeds one, the working heads are ensured to be uniformly distributed in the circumferential direction of the magnesium alloy pipe blank so as to balance forming load.
Furthermore, the preset distance delta in the third step is 2mm-40 mm.
Furthermore, in order to prevent the laser beam from irradiating the surface of the magnesium alloy tube blank and reflecting the laser beam back to the laser heating head, in the third step, the laser forms an included angle alpha with the axial direction of the magnesium alloy tube blank through the laser beam output by the laser heating head, and the included angle alpha is 20-80 degrees.
Further, when the laser outputs laser beams to heat in the sixth step, the temperature of the contact side of the deformation area A and the die is not lower than 100 ℃, the temperature of the contact side of the deformation area A and the tool head is not higher than 250 ℃, and when the laser parameters are changed and the temperature requirement cannot be met, the heating requirement is met by adopting a mode of carrying out auxiliary heating on the die.
Furthermore, when multi-pass machining is performed in the step eight, the pass reduction rate is gradually reduced.
Has the advantages that:
1. the laser is used as a heating heat source to heat the deformation area and the surrounding area of the material on line, the material absorbs the laser energy, the temperature required by plastic deformation can be instantly reached, the limitation of the size and the shape of the blank is avoided, the heating efficiency is high, the heat preservation is not needed, and the green environment is protected.
2. When the pipe with the same inner diameter is processed, the forming process equipment is not required to be changed, only the plastic processing parameters are required, and the process flexibility is good.
3. By controlling laser parameters, the regulation and control of the acting area, the heating depth and the temperature gradient of the heating area can be realized, and by controlling the plastic processing parameters, the regulation and control of the strain gradient of the deformation area can be realized, thereby being beneficial to realizing automatic operation, simultaneously reducing heat input, saving energy and effectively prolonging the service life of forming equipment and process equipment.
4. The processing flow is short, the process stability is good, and meanwhile, the formed magnesium alloy pipe has good process stability and small residual stress.
Drawings
FIG. 1 is a schematic structural view of plastic working of a magnesium alloy pipe according to example 1 of the present invention;
FIG. 2 is a schematic structural view of plastic working of a magnesium alloy pipe according to example 2 of the present invention;
FIG. 3 is a schematic structural view of plastic working of a magnesium alloy pipe according to example 3 of the present invention;
in the figure: 1-a main shaft; 2-a mould; 31-magnesium alloy extruded tube blank; 32-magnesium alloy cast pipe blank; 33-magnesium alloy round plate blank; 4-working head; 5-a fixing device; 6-a temperature measuring device; 7-laser heating head; 8-a laser; 9-a chuck; a-a deformation zone; b, laser spots; an alpha-angle; delta-preset distance.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example 1:
this example is a plastic working method of a ZK60 magnesium alloy tube having a wall thickness of 1.5mm and an inner diameter of 100mm, comprising the steps of:
step one, selecting ZK60 magnesium alloy with a bottom to extrude a tube blank 31, wherein the grain size is 6-25 μm, the inner diameter is phi 100mm, and the wall thickness is 6 mm;
step two, sleeving the AZ31 magnesium alloy extruded tube blank 31 on the mold 2, positioning the bottom of the tube wall of the magnesium alloy extruded tube blank 31, fixing the tube wall on the mold 2 by using a fixing device 5, and fixing the mold 2 on the main shaft 1 (as shown in figure 1);
setting the initial processing position of the working head 4, wherein the working head 4 comprises two working heads which are symmetrically arranged at two sides of the periphery of the magnesium alloy extruded tube blank 31, adjusting the laser heating head 7 to enable the laser beam output by the laser heating head to form an included angle alpha of 30 degrees with the axis of the magnesium alloy extruded tube blank 31, adjusting the initial irradiation position of a laser spot B to enable the laser spot B and the contact area of the working head 4 and the magnesium alloy extruded tube blank 31 to keep a preset distance delta of 15mm in the axial direction, setting the movement tracks of the laser heating head 7 and the working head 4 to enable the laser heating head 7 and the working head 4 to move along the axis of the die 2, enabling the laser spot B and the contact area to move leftwards from the bottom of the;
step four, setting laser heating parameters: defocusing amount is 45mm, and the output power of the laser 8 is set to 1600W;
step five, setting plastic processing parameters: the rotating speed of the main shaft 1 is 1200r/min, and the pass reduction rate of the working head 4 is 58.3 percent;
coating a lubricant mixed by graphite and engine oil on the outer surface of the magnesium alloy extruded tube blank 31;
seventhly, performing first-pass forming, enabling the laser 8 to emit light, enabling the output laser to irradiate the surface of the magnesium alloy extruded tube blank 31 through the laser heating head 7, enabling the working head 4 to roll a heating area on the surface of the magnesium alloy extruded tube blank 31, enabling the magnesium alloy extruded tube blank 31 to rotate along with the die 2, enabling the working head 4 and the laser heating head 7 to keep a preset distance delta and feeding the magnesium alloy extruded tube blank along the axis of the die 2 at a speed of 20mm/min according to the track set in the step two, and in the process, adopting the infrared temperature measuring device 6 to perform online monitoring on the temperature of the heating area to ensure that the temperature of the laser irradiation area on the surface of the tube blank is 250 +/-20 ℃ until the working head 4 rolls the whole magnesium alloy tube blank;
step eight, axially moving the laser heating head 7 and the working head 4, returning to the initial processing position in the step three, setting the pass reduction rate of the working head 4 to be 40%, and adjusting the output power of the laser to be 1200W;
step nine, performing second-pass forming, enabling the laser 8 to emit light, enabling the output laser to irradiate the surface of the magnesium alloy extruded tube blank 31 through the laser heating head 7, enabling the working head 4 to roll a heating area on the surface of the magnesium alloy extruded tube blank 31, enabling the magnesium alloy extruded tube blank 31 to rotate along with the die 2, enabling the working head 4 and the laser heating head 7 to keep a preset distance delta and feeding the magnesium alloy extruded tube blank along the axis of the die 2 at a speed of 20mm/min according to the track set in the step two, in the process, adopting the infrared temperature measuring device 6 to perform online monitoring on the temperature of the heating area to ensure that the temperature of the laser irradiation area B on the surface of the tube blank is 250 +/-20 ℃ until the working head 4 rolls the whole magnesium alloy extruded tube blank 31, stopping the laser 8 emitting;
step ten, cutting off the bottom of the formed magnesium alloy pipe by using a lathe, and then taking the formed magnesium alloy pipe off the die 2.
The formed magnesium alloy tube was sampled and observed for microstructure, the structure of the magnesium alloy tube was uniform and the average grain size was 1 μm.
Example 2:
the embodiment is a plastic processing method of an AZ31 magnesium alloy pipe with the wall thickness of 3mm and the inner diameter of 100mm, which comprises the following steps:
step one, selecting an AZ31 magnesium alloy cast tube blank 32, wherein the average grain size is 80 mu m, the inner diameter is phi 100mm, and the wall thickness is 30 mm;
step two, sleeving the AZ31 magnesium alloy cast pipe blank 32 on a die 2 with an electric heating device inside, pushing one side of the magnesium alloy cast pipe blank 32 on a chuck 9 for positioning, and fixing the die 2 on a main shaft 1 (as shown in figure 2);
setting a starting processing position of the working head 4, wherein the working head 4 comprises three working heads which are uniformly arranged at 120 degrees in the circumferential direction of the magnesium alloy cast pipe blank 32, setting a starting irradiation position of a laser spot B, keeping a preset distance delta of 28mm between the laser spot B and a contact area of the working head 4 and the magnesium alloy cast pipe blank 32 in the axial direction, setting movement tracks of the working head 4 and the laser heating head 7, enabling the working head 4 and the laser heating head 7 to linearly move from the right end of the magnesium alloy cast pipe blank 32 to one side of the chuck 9, and setting the feeding speed to be 45 mm/min;
step four, setting forming parameters: the rotating speed of the main shaft 1 is 850r/min, and the pass reduction rate of the working head 4 is 55 percent;
step five, adjusting the laser heating head 7 to enable the output laser beam of the laser heating head to form an included angle alpha of 60 degrees with the axis of the magnesium alloy cast pipe blank 32, enabling the defocusing amount to be 55mm, and setting the output power of the laser 8 to be 1800W;
coating a lubricant mixed by graphite and engine oil on the outer surface of the magnesium alloy cast pipe blank 32, electrifying an electric heating device on the die 2, heating the die 2 to 100 ℃, and simultaneously preheating the magnesium alloy cast pipe blank 32 sleeved on the outer side of the die 2;
seventhly, performing first-pass forming, enabling the laser 8 to emit light, enabling the output laser to be irradiated to the surface of the magnesium alloy cast pipe blank 32 through the laser heating head 7, enabling the working head 4 to roll a heating area on the surface of the magnesium alloy cast pipe blank 32, enabling the magnesium alloy cast pipe blank 32 to rotate along the die 2, enabling the working head 4 and the laser heating head 7 to keep a preset distance delta to feed along the axis of the die 2 at a speed of 45mm/min according to the track set in the step two, and in the process, adopting the infrared temperature measuring device 6 to perform online monitoring on the temperature of the heating area to ensure that the temperature of a deformation area A on the surface of the pipe blank is not lower than 200 ℃ until the length of an unprocessed part of the magnesium alloy cast pipe blank;
eighthly, axially moving the working head 4 and the laser heating head 7, returning to the right side of the magnesium alloy cast pipe blank 32, setting the pass reduction rate of the working head 4 to be 44%, and adjusting the output power of the laser 8 to be 1500W;
step nine, performing second-pass forming, wherein the laser device 8 emits light, the output laser is irradiated to the surface of the magnesium alloy cast pipe blank 32 through the laser heating head 7, the working head 4 rolls a heating area on the surface of the magnesium alloy cast pipe blank 32, the magnesium alloy cast pipe blank 32 rotates along with the die 2, the working head 4 and the laser heating head 7 keep a preset distance delta and feed along the axis of the die 2 at a speed of 45mm/min according to the track set in the step three, in the process, the infrared temperature measuring device 6 is adopted to perform online monitoring on the temperature of the heating area, the temperature of a deformation area A on the surface of the magnesium alloy cast pipe blank 32 is ensured to be not lower than 200 ℃, and the laser device 8 stops emitting light until the unprocessed part of the magnesium alloy cast pipe;
step ten, axially moving the working head 4 and the laser heating head 7, returning to the right side of the magnesium alloy cast pipe blank 32, setting the pass reduction rate of the working head 4 to be 35%, and adjusting the output power of the laser 8 to be 1300W;
step eleven, performing third forming, wherein a laser 8 emits light, the output laser is irradiated to the surface of the magnesium alloy cast pipe blank 32 through a laser heating head 7, a working head 4 rolls a heating area on the surface of the magnesium alloy cast pipe blank 32, the magnesium alloy cast pipe blank 32 rotates along with the die 2, the working head 4 and the laser heating head 7 keep a preset distance delta and feed along the axis of the die 2 at a speed of 45mm/min according to the track set in the step three, in the process, an infrared temperature measuring device 6 is adopted to perform online monitoring on the temperature of the heating area, the temperature of a deformation area A on the surface of the pipe blank is ensured to be not lower than 200 ℃, and the laser 8 stops emitting light until the unprocessed part of the magnesium alloy cast pipe blank 32 is 5 mm;
step twelve, axially moving the working head 4 and the laser heating head 7, returning to the right side of the magnesium alloy cast pipe blank 32, setting the pass reduction rate of the working head 4 to be 29 percent, and adjusting the output power of the laser 8 to be 1200W;
thirteen, forming in a fourth pass, emitting light by a laser 8, irradiating the output laser to the surface of the magnesium alloy cast pipe blank 32 through a laser heating head 7, rolling a heating area on the surface of the magnesium alloy cast pipe blank 32 by a working head 4, enabling the magnesium alloy cast pipe blank 32 to rotate along the die 2, feeding the working head 4 and the laser heating head 7 along the axis of the die 2 at a speed of 45mm/min by keeping a preset distance delta according to the track set in the third step, in the process, monitoring the temperature of the heating area on line by using an infrared temperature measuring device 6, ensuring that the temperature of a deformation area A on the surface of the magnesium alloy cast pipe blank 32 is not lower than 200 ℃ until the unprocessed part of the magnesium alloy cast pipe blank 32 is 5mm, stopping emitting light by the laser 8, stopping rotation of a main shaft 1, and cutting off the;
fourteen, taking the formed magnesium alloy pipe off the die 2, clamping the pipe on a lathe, and removing an unprocessed area with the thickness of 30mm and the length of 5 mm.
Sampling the formed magnesium alloy pipe, and observing the microstructure of the magnesium alloy pipe, wherein the microstructure of the magnesium alloy pipe is uniform, and the grain size is 1-5 mu m.
Example 3:
this example is a plastic working method of an AZ61 magnesium alloy tube having a wall thickness of 1.5mm and an inner diameter of 100mm, comprising the steps of:
selecting a pre-pressed AZ61 magnesium alloy plate blank, wherein the pre-pressing amount is 6%, the wall thickness of the plate blank is 3.76mm, the grain size is 10-30 mu m, and cutting the plate blank into a magnesium alloy round plate blank 33 with the outer diameter of phi 185 mm;
step two, fixing a magnesium alloy round plate blank 33 at the bottom of the mould 2 in a sleeved mode, fixing the magnesium alloy round plate blank on the mould 2 by using a fixing device 5, and fixing the mould 2 on the main shaft 1 (shown in figure 3);
setting a starting processing position of the working head 4, wherein the working head 4 comprises a working head, adjusting the laser heating head 7 to enable an included angle alpha formed by an output laser beam and the magnesium alloy circular slab 33 in the axial direction to be 40 degrees, setting a starting irradiation position of a laser spot B, enabling the laser spot B, the working head 4 and a contact area of the magnesium alloy circular slab 33 to keep a preset distance delta of 10mm in the axial direction, respectively setting motion tracks of the working head 4 and the laser heating head 7, enabling the working head 4 and the laser heating head 7 to respectively feed along an involute from the magnesium alloy circular slab 33 to the end of the main shaft 1 at a speed of 25 mm/min;
step four, setting forming parameters: the rotating speed of the main shaft 1 is 450 r/min;
step five, setting laser heating parameters: defocusing amount is 30mm, and the output power of the laser 8 is set to be 1100W;
coating a lubricant mixed by graphite and engine oil on the outer surface of the magnesium alloy round plate blank 33;
seventhly, performing first-time forming, enabling the laser 8 to emit light, enabling the output laser to irradiate the surface of the magnesium alloy circular plate blank 33 through the laser heating head 7, enabling the working head 4 to roll a heating area on the surface of the magnesium alloy circular plate blank 33, enabling the magnesium alloy circular plate blank 33 to rotate along with the die 2, enabling the working head 4 and the laser heating head 7 to keep a preset distance delta and feeding the working head 4 and the laser heating head 7 according to the track set in the third step and an involute at the speed of 25mm/min, and in the process, adopting the infrared temperature measuring device 6 to perform online monitoring on the temperature of the heating area to ensure that the temperature of the surface of the magnesium alloy circular plate blank 33 is not lower than 200 ℃ until the processing head rolls the whole magnesium alloy circular plate blank 33 (;
step eight, moving the laser heating head 7 and the working head 4, and returning to the initial processing position of the step four, wherein the defocusing amount of the laser heating head 7 is 30mm, the gap between the processing head and the die 2 is 3.76mm, and meanwhile, setting the motion tracks of the laser heating head 7 and the working head 4, so that the laser heating head 7 and the working head 4 feed along the axis of the die 2 at the speed of 25 mm/min;
step nine, performing second-pass forming, enabling the laser 8 to emit light, enabling the output laser to irradiate the surface of the magnesium alloy circular plate blank 33 through the laser heating head 7, enabling the working head 4 to roll a heating area on the surface of the magnesium alloy circular plate blank 33, enabling the magnesium alloy circular plate blank 33 to rotate along with the die 2, enabling the working head 4 and the laser heating head 7 to keep a preset distance delta, feeding along the axis of the die 2 at a speed of 25mm/min according to the track set in the step eight, and in the process, adopting the infrared temperature measuring device 6 to perform online monitoring on the temperature of the heating area to ensure that the surface temperature of the magnesium alloy circular plate blank 33 is not lower than 200 ℃ until the magnesium alloy circular plate blank 33 is drawn into a circular tube, and enabling the laser 8;
step ten, the laser heating head 7 and the working head 4 axially move and return to the initial processing position set in the step four;
step eleven, arranging a laser processing head 7, adopting double processing heads, distributing the two processing heads on two sides of the circumference of the drawn circular tube according to 180 degrees, setting the thinning rate of the working head 4 to be 65.7 percent, and simultaneously setting the movement tracks of the laser heating head 7 and the working head 4 to enable the laser heating head 7 and the working head 4 to feed along the axis of the die 2 at the speed of 25 mm/min;
step twelve, performing third forming, wherein the laser 8 emits light, the output laser is irradiated to the surface of the drawn circular tube through the laser heating head 7, the working head 4 rolls the heating area on the surface of the drawn circular tube, the drawn circular tube rotates along with the die 2, the working head 4 and the laser heating head 7 keep a preset distance delta, and the preset distance delta is fed along the axis of the die 2 at the speed of 25mm/min according to the track preset in the step eleven, in the process, the infrared temperature measuring device 6 is adopted to perform online monitoring on the temperature of the heating area so as to ensure that the temperature of the laser irradiation area B on the surface of the drawn circular tube is 200 +/-20 ℃, until the working head 4 rolls the whole drawn circular tube, the laser 8 stops emitting light, and the main;
and thirteen, cutting off the bottom of the formed magnesium alloy pipe, and then taking the magnesium alloy pipe off the die 2.
Sampling the formed magnesium alloy pipe, and observing the microstructure of the magnesium alloy pipe, wherein the microstructure of the magnesium alloy pipe is uniform, and the grain size is 0.7-2 mu m.
The limitation of the protection scope of the present invention is understood by those skilled in the art, and various modifications or changes which can be made by those skilled in the art without inventive efforts based on the technical solution of the present invention are still within the protection scope of the present invention.
Claims (6)
1. A plastic processing method of a fine crystal magnesium alloy pipe is characterized by comprising the following steps:
selecting geometric parameters and plastic processing parameters of a magnesium alloy tube blank according to the wall thickness requirement of a required finished magnesium alloy tube;
step two, sleeving the magnesium alloy pipe blank on the mold (2), fixing the magnesium alloy pipe blank by using a fixing device (5) so that the magnesium alloy pipe blank does not rotate relative to the mold (2), and fixing the mold (2) on the main shaft (1);
setting the initial processing position of the working head (4), setting the initial heating position and the angle of the laser heating head (7) at the same time, keeping the initial heating position and the angle at a preset distance delta in the axial direction of the main shaft (1), and respectively setting the processing tracks of the laser heating head (7) and the working head (4);
step four, setting laser heating parameters including defocusing amount and output power,
step five, setting plastic processing parameters including the rotating speed of the main shaft (1) and pass reduction rate;
step six, starting the main shaft (1) to drive the die (2) to rotate, enabling the magnesium alloy tube blank to rotate along with the die (2), enabling the laser (8) to emit light, enabling the output laser beam to irradiate the surface of the magnesium alloy tube blank through the laser heating head (7), enabling the material to absorb the laser, forming a local heating area on the magnesium alloy tube blank, and enabling the working head (4) to extrude the local heating area of the magnesium alloy tube blank; meanwhile, the temperature measuring device (6) monitors the temperature of the local heating area, and the heating temperature of the material is controlled by changing the power of the laser (8);
feeding the laser heating head (7) and the working head (4) according to a preset track, continuously rotating the magnesium alloy tube blank along with the main shaft (1), continuously heating the magnesium alloy tube blank by the laser heating head (7), continuously rolling a local heating area on the magnesium alloy tube blank by the working head (4) until the part to be processed of the magnesium alloy tube blank is formed, and stopping light emission by the laser (8);
step eight, repeating the step three to the step seven when multi-pass machining is adopted until the geometric dimension of the magnesium alloy tube blank meets the required requirement;
step nine, cutting an undeformed region of the formed magnesium alloy pipe;
step eight, when multi-pass machining is carried out, the pass reduction rate is sequentially reduced;
the setting range of the defocusing amount in the fourth step is 30-55 mm.
2. The fine crystalline magnesium alloy pipe plastic working method as claimed in claim 1, wherein the grain size of the magnesium alloy pipe blank in the first step is less than 85 μm, and the outer surface of the magnesium alloy pipe blank is coated with a lubricant.
3. The plastic working method of the fine crystal magnesium alloy tube according to claim 1, characterized in that the number of the working heads (4) in the third step is not more than three, and if more than one working head (4) is provided, the working heads (4) are uniformly distributed in the circumferential direction of the magnesium alloy tube blank.
4. The fine crystalline magnesium alloy tube plastic working method according to claim 1, characterized in that the predetermined distance Δ in the third step is 2mm to 40 mm.
5. The plastic working method of fine crystal magnesium alloy pipe according to claim 1, characterized in that the laser (8) in the third step forms an included angle α with the axial direction of the magnesium alloy pipe blank by the laser beam output from the laser heating head (7), and the included angle α is 20-80 °.
6. The plastic working method of fine crystal magnesium alloy pipe according to claim 1, characterized in that when the laser (8) outputs the laser beam to heat in the sixth step, the temperature of the contact side of the deformation zone A and the die (2) is not lower than 100 ℃, the temperature of the contact side of the deformation zone A and the tool head (4) is not higher than 250 ℃, and when the adjustment laser parameter can not meet the temperature requirement, the die (2) is heated in an auxiliary way to adjust the heating of the magnesium alloy pipe blank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402746.XA CN109702024B (en) | 2018-11-23 | 2018-11-23 | Plastic processing method for fine-grain magnesium alloy pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402746.XA CN109702024B (en) | 2018-11-23 | 2018-11-23 | Plastic processing method for fine-grain magnesium alloy pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109702024A CN109702024A (en) | 2019-05-03 |
| CN109702024B true CN109702024B (en) | 2020-10-30 |
Family
ID=66255028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811402746.XA Active CN109702024B (en) | 2018-11-23 | 2018-11-23 | Plastic processing method for fine-grain magnesium alloy pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109702024B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5154678B2 (en) * | 2011-08-25 | 2013-02-27 | 三菱電機株式会社 | Cooker |
| CN104827750A (en) * | 2015-05-21 | 2015-08-12 | 浙江喜得宝丝绸科技有限公司 | Spinning printing roller platemaking method and spinning printing roller platemaking device |
| CN106424286A (en) * | 2016-10-20 | 2017-02-22 | 江苏理工学院 | Spinning forming method and device based on laser heating |
| CN106623574A (en) * | 2016-10-20 | 2017-05-10 | 江苏理工学院 | Laser heating-based spin forming equipment |
| CN106670258A (en) * | 2016-12-16 | 2017-05-17 | 江苏理工学院 | Plasticity machining method for metal composite pipe |
| CN106844815A (en) * | 2016-10-26 | 2017-06-13 | 江苏理工学院 | A kind of LASER HEATING program composition and optimization method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112633B2 (en) * | 1991-12-05 | 1995-12-06 | 川崎重工業株式会社 | Laser welding method for thin plates |
| JP3637168B2 (en) * | 1996-12-04 | 2005-04-13 | 松下冷機株式会社 | Spiral fin fixing device |
| CN103691789B (en) * | 2013-12-06 | 2016-08-17 | 天津重型装备工程研究有限公司 | A kind of method of large thick-wall cylindrical blank hot spinning forming head |
-
2018
- 2018-11-23 CN CN201811402746.XA patent/CN109702024B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5154678B2 (en) * | 2011-08-25 | 2013-02-27 | 三菱電機株式会社 | Cooker |
| CN104827750A (en) * | 2015-05-21 | 2015-08-12 | 浙江喜得宝丝绸科技有限公司 | Spinning printing roller platemaking method and spinning printing roller platemaking device |
| CN106424286A (en) * | 2016-10-20 | 2017-02-22 | 江苏理工学院 | Spinning forming method and device based on laser heating |
| CN106623574A (en) * | 2016-10-20 | 2017-05-10 | 江苏理工学院 | Laser heating-based spin forming equipment |
| CN106844815A (en) * | 2016-10-26 | 2017-06-13 | 江苏理工学院 | A kind of LASER HEATING program composition and optimization method |
| CN106670258A (en) * | 2016-12-16 | 2017-05-17 | 江苏理工学院 | Plasticity machining method for metal composite pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109702024A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103170798B (en) | A kind of processing method of high-quality large-diameter thin-wall metal cylinder | |
| CN105397276B (en) | A kind of method of agitating friction weldering increasing material manufacturing bar | |
| CN109605039A (en) | A kind of electric arc increasing material and electric auxiliary hot rolling forming composite manufacturing method and device | |
| Vahdani et al. | Electric hot incremental sheet forming of Ti-6Al-4V titanium, AA6061 aluminum, and DC01 steel sheets | |
| CN210098977U (en) | Composite heat source synchronous rolling additive manufacturing equipment | |
| CN102240860B (en) | Method and equipment for manufacturing gradient material mould | |
| CN101642778B (en) | Laser texturing processing method on surface of roller | |
| EP1728567A1 (en) | Method and apparatus for vacuum forming a flat metal sheet into a thin bowl-like body as well as the use of the method and the apparatus | |
| CN106903204A (en) | Multi-angle conical shell rotary press modelling method | |
| CN113477927B (en) | Steel part surface repairing method | |
| CN113369728B (en) | Method for manufacturing titanium alloy large-scale complex structure component | |
| CN101642849A (en) | Laser texturing processing method on surface of roller | |
| CN114561606A (en) | Preparation method of magnesium alloy wire for electric arc additive | |
| CN107309318B (en) | Plate radial direction differential temperature spinning apparatus and process | |
| CN109702024B (en) | Plastic processing method for fine-grain magnesium alloy pipe | |
| EP2842677B1 (en) | Method for making tools for machines adapted for forming threads on cylindrical bodies by means of plastic deformation | |
| CN103286246A (en) | Method for manufacturing high-strength screws with fine threads for wind-driven generator foundations | |
| US20130025338A1 (en) | Tube-forging method | |
| CN105013939B (en) | Stirring friction forming device and technology based on self heating | |
| CN111005022B (en) | Method for preparing high-hardness iron-based coating on surface of beryllium bronze copper roller by utilizing three lasers in synergy mode | |
| CN110977142B (en) | Impact stirring friction welding device for connecting magnesium-aluminum alloy heterogeneous workpieces | |
| RU2641444C2 (en) | Method of mechanical processing of steel casting with fragmentation of chips | |
| CN1792548B (en) | Method for finishing processing of controllable deforming electronic beam | |
| CN103498148B (en) | A kind of laser cladding method for perforating head surface | |
| CN109328239B (en) | Magnesium alloy material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |