CN112246903A - A kind of preparation device and method of magnesium alloy thin tube separated by rod and needle - Google Patents
A kind of preparation device and method of magnesium alloy thin tube separated by rod and needle Download PDFInfo
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- CN112246903A CN112246903A CN202011025208.0A CN202011025208A CN112246903A CN 112246903 A CN112246903 A CN 112246903A CN 202011025208 A CN202011025208 A CN 202011025208A CN 112246903 A CN112246903 A CN 112246903A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/04—Mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
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Abstract
A device and a method for preparing a magnesium alloy thin tube with separated pins and needles belong to the technical field of metal materials and processing thereof; the device mainly comprises an extrusion rod, an extrusion needle pad, an extrusion female die, a female die pad, an extrusion cylinder, a fixed sleeve, an extrusion die holder and a die releasing frame. In the device, the extrusion rod is separated from the extrusion needle, and the extrusion needle can freely move in the extrusion cylinder to a certain degree in the extrusion process, so that automatic centering is realized, and the dimensional precision of the pipe is improved; and the extrusion needle and the extrusion die can be replaced at any time, and the diameter and the wall thickness of the pipe can be controlled by adjusting the matching of the extrusion needle and the extrusion die. The magnesium alloy thin tube prepared by the process has the advantages of uniform structure, excellent mechanical property, good surface quality and accurate size. The device is simple, low in processing cost, high in efficiency and material utilization rate, and can be used for mass production.
Description
Technical Field
The invention belongs to the technical field of metal materials and processing thereof, and particularly relates to a device and a method for preparing a magnesium alloy thin pipe with a separated rod and a separated needle.
Background
The magnesium alloy is the lightest structural material in practical metal, has the characteristics of low density, high specific strength and specific stiffness, excellent machining performance and the like, also has good damping and damping performance, shock resistance, electric conduction and heat conduction performance and electromagnetic shielding performance, is widely applied to industries such as aviation, aerospace, automobiles, 3C and the like, and becomes the third metal structural material after steel and aluminum alloy. The magnesium alloy has a close-packed hexagonal structure, and has less slip system at room temperature, so that the magnesium alloy has poor plasticity and is difficult to process. At present, most practical magnesium alloy products are produced by adopting a casting method, and particularly, die castings are more. However, the mechanical properties of magnesium alloy castings do not meet the requirements of certain applications, the casting structure is easy to generate defects, and in addition, the casting process also limits the shape and the size of products. These factors greatly limit the applications of magnesium alloys. The strength and plasticity of the magnesium alloy are obviously improved after deformation, and the deformation process increases the form of a workpiece and enlarges the application range of the magnesium alloy. Therefore, wrought magnesium alloys have become a focus of research and are receiving increasing attention. However, the magnesium alloy is difficult to deform due to its special structure, and thus, the deformation characteristics and deformation process of the magnesium alloy need to be carefully studied to develop a deformation process suitable for the magnesium alloy.
The wrought magnesium alloy is widely applied to the fields of automobiles, aerospace, national defense and military industry, biomedical use, electronics and other civilian use. The wrought magnesium alloy serving as a structural member is applied to various fields, can reduce the weight of equipment and energy consumption, and has good mechanical properties. The magnesium alloy thin pipe material as a wrought magnesium alloy also has wide application in the fields of automobiles, aerospace, biomedicine, war industry and the like. The thin tube prepared by adopting the extrusion process can improve the utilization rate of raw materials, and the prepared tube has good surface quality, uniform tissue and excellent mechanical property. However, the quality of the magnesium alloy thin tube is affected by the extrusion process (extrusion temperature, extrusion ratio, extrusion speed) and the alloy composition. In addition, most of the existing magnesium alloy thin pipe processing devices are single-size equipment, only single-size pipe processing can be realized, a plurality of parts such as a die set and an extrusion rod need to be replaced when pipes with different sizes are processed, the processing cost is high, and the process is complex. In order to simplify the processing technology of the magnesium alloy thin pipe and improve the quality of the pipe, reasonable design of the components of the magnesium alloy and systematic research on forming equipment and the processing technology are needed.
The existing preparation method of the magnesium alloy pipe comprises the steps of extrusion of a split-flow die, extrusion of a mandrel, extrusion of an extrusion rod and extrusion needle integrated structure, and the like. The inside amalgamation welding seam that exists of tubular product that the reposition of redundant personnel mould extrusion method made, the compactness is poor, and the tissue is inhomogeneous to reduced tubular product intensity, and dabber extrusion and extrusion stem and extrusion needle integral type structure extrusion method, the stability of dabber and extrusion needle can reduce along with the increase of length, is difficult to guarantee the size precision of tubular product. Therefore, magnesium alloy pipes having uniform structure and high dimensional accuracy are currently demanded by the industry, and the applications of magnesium alloys will be further widened.
Disclosure of Invention
The invention aims to provide a device and a method for preparing a magnesium alloy thin tube with separated rod and needle, aiming at the defects of the extrusion process of the magnesium alloy thin tube in the prior art.
The invention is realized by the following technical scheme,
the invention relates to a device for preparing a magnesium alloy thin pipe with controllable wall thickness. The extrusion rod is assembled on an upper sliding block of the four-column hydraulic press, and the extrusion die base is assembled on a base of the four-column hydraulic press and is fixed by hexagon socket head screws respectively; the cylindrical fixing sleeve is axially and vertically fixed on the extrusion die holder, the extrusion cylinder is coaxially nested in the fixing sleeve, a central hole with a relatively large diameter is formed in the center of the bottom of the extrusion cylinder and used for assembling an extrusion female die, and a central through hole with a relatively small diameter is formed in the upper part of the central hole with the relatively large diameter and used for assembling an extrusion needle, an extrusion needle pad, an extrusion rod and a blank; the female die pad is arranged in a preformed hole on the upper surface of the extrusion die seat, and the extrusion female die is assembled above the female die pad and is matched with the extrusion container; the center of the extrusion female die is provided with a through hole, the upper part of the hole is a variable hole with gradually reduced diameter, the section of the variable hole is a 90-degree transition circular arc, the diameter of the circular arc at the lower end of the variable hole is vertical to the central axis of the variable hole, a small straight hole with relatively smaller diameter is arranged below the variable hole, the diameter of the small straight hole is the same as that of the lower end of the variable hole, the straight hole is a pipe outer diameter forming hole, and a large straight hole with relatively larger diameter is arranged below the small straight hole; the blank is arranged in a central through hole with a relatively small diameter of an extrusion cylinder above an extrusion female die, an extrusion needle pad is positioned above the blank, an extrusion needle and the extrusion needle pad are installed in a matched mode, the extrusion needle pad plays a role in supporting and fixing the extrusion needle, meanwhile, the tip end of the extrusion needle extends downwards into the blank, the whole matching device formed by the extrusion needle and the extrusion needle pad can freely move up and down in the extrusion cylinder, the upper surface of the whole matching device formed by the extrusion needle and the extrusion needle pad is a flush end, and a positioning groove is formed in the central position of the extrusion needle; the lower surface of the extrusion needle pad, the outer side of the extrusion needle, the extrusion die hole and the inner wall of the extrusion container form an extrusion cavity; the center of the lower surface of the extrusion rod is provided with a coordination bulge which is used for being matched with a coordination groove of the extrusion needle, and the function of positioning is achieved. The demoulding frame is two symmetrical round built-in boss parts which are matched for use to realize the demoulding of the pipe.
In the device, the extrusion rod, the lower die holder and the fixed sleeve are fixedly assembled, and other parts are non-fixedly assembled.
The device is separated from the extrusion needle, the extrusion needle is installed in cooperation with the extrusion needle pad, the positioning is arranged between the extrusion rod and the extrusion needle, the extrusion needle can freely move in the extrusion cylinder in the extrusion process, automatic centering is realized, the size precision of the pipe is improved, the extrusion needle and the extrusion female die are convenient to replace at any time, and the diameter and the wall thickness of the pipe are changed by adjusting the cooperation of the extrusion needle and the extrusion female die.
The device adopts an external heating mode, and the extrusion container, the extrusion female die, the extrusion needle pad and the blank can be placed in a resistance furnace together for heating in the process of processing and preparing the pipe, so that the whole body is heated uniformly; after the extrusion, because the connection effect of shaping tubular product, recipient, extrusion die, extrusion needle, extrusion cushion and shaping tubular product can form a whole, wholly take off it, then put into fixed cover with two drawing of patterns frame combinations, put into the drawing of patterns frame with the part that wholly takes off again in, the ejector beam of moving downwards will extrude cushion, extrusion needle, shaping tubular product and extrusion die and extrude the die and extrude from the recipient inner chamber, realize the drawing of patterns.
The preparation method of the magnesium alloy tubule comprises the following steps:
(1) processing a magnesium alloy ingot into a hollow cylindrical blank;
(2) uniformly smearing a lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating to 400-450 ℃, then putting the hollow cylindrical blank obtained in the step (1) into the resistance furnace, and preserving heat for 3-;
(3) taking out the extrusion container, the extrusion female die, the extrusion needle pad and the hollow cylindrical blank from the resistance furnace, assembling the components on an extrusion die seat, and extruding to obtain a seamless pipe;
(4) and (4) after extrusion, demolding, and taking out the prepared magnesium alloy seamless pipe.
The extrusion ratio in the preparation method of the magnesium alloy thin pipe with the controllable wall thickness is 10-70.
In the step (1), the outer diameter of the hollow cylindrical blank is 30-40 mm, and the diameter of the middle through hole is 3.5-6.5 mm.
In the step (2), the lubricant is graphite-based or molybdenum disulfide-based lubricating grease which is uniformly coated on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad before heating.
In the step (2), a resistance furnace is adopted for heating.
In the step (3), a contact thermocouple or an infrared thermometer is adopted to detect the temperature of the outer surface of the extrusion cylinder, extrusion is carried out when the temperature is 350-420 ℃, and the extrusion speed is 0.5-10 mm/s.
The magnesium alloy thin pipe with controllable wall thickness prepared by the method has the advantages of 5-10 mm of section diameter and 0.8-2 mm of wall thickness.
The invention has the following beneficial effects:
except that the extrusion rod, the lower die holder and the fixed sleeve are fixedly assembled, other parts are non-fixedly assembled, the extrusion needle is separated from the extrusion rod, and the extrusion rod and the extrusion needle in other magnesium alloy pipe extrusion equipment are an integral part. The separation of the two has the advantages that the extrusion needle can freely move to a certain degree, the automatic centering effect of the extrusion needle in the extrusion process is good, the dimensional precision of the pipe is improved, the difference rate of the front end wall of the extruded pipe prepared by the invention is less than or equal to 4.18 percent, and the difference rate of the tail end wall of the extruded pipe is less than or equal to 2.00 percent; in addition, the two are separated, so that the tube demoulding is facilitated, the extrusion needle is used as a main working part, the damage is easy to occur, and the cost can be reduced only by replacing the extrusion needle after the two are separated.
The extrusion needle and the extrusion female die in the device are convenient to replace, can be freely replaced on the premise of not disassembling the die frame, and are convenient to disassemble and assemble; the extrusion needle and the extrusion die are freely matched, the extrusion ratio is changed, and the processing of magnesium alloy pipes with different sizes can be realized.
The height-diameter ratio of the extrusion female die in the device is small, the structure is stable, and the strength is high; the lower part of the extrusion female die is embedded into the extrusion die holder, and the upper part of the extrusion female die enters the extrusion container, so that the positioning effect is achieved, the center line of the extrusion container and the center line of the extrusion female die are ensured to be coincident, the structure is firm, and the stability is strong.
Compared with other magnesium alloy thin pipe extrusion devices, the thin pipe preparation device has simple demoulding.
The magnesium alloy thin pipe preparation device disclosed by the invention is simple in structure, low in equipment cost and strong in universality, and the processing cost of the magnesium alloy thin pipe is obviously reduced.
The magnesium alloy thin tube prepared by the device has high compactness and does not have the defect of extrusion holes; the structure is uniform, the alloy is completely and dynamically recrystallized to form fine and uniform equiaxial grains, so that the pipe has excellent mechanical property, good surface quality and high dimensional precision.
The preparation method of the magnesium alloy tubule has the advantages of convenient operation, simple process, high efficiency and high material utilization rate, and can realize mass production.
Drawings
FIG. 1 is a view of a magnesium alloy pipe in example 1, (a) a pipe cross-sectional diameter; (b) wall thickness of pipe
FIG. 2 is a microstructure diagram of the tube in example 3, (a) cross section; (b) a longitudinal section;
FIG. 3 is an assembly drawing of a magnesium alloy tubule manufacturing device with separated pins according to the present invention; wherein 1: extruding the die holder; 2: fixing a sleeve; 3: an extrusion cylinder; 4: a pressing pin; 5: pressing the needle pad; 6: an extrusion stem; 7: a blank; 8: extruding the female die; 9: a cavity die pad; 10: internal hexagonal stud screws;
FIG. 4 is a schematic view of an extrusion die in a magnesium alloy tubule manufacturing device with separated pins according to the present invention;
FIG. 5 is a schematic view of an extrusion stem in a magnesium alloy tubule manufacturing device with separated stem and needle according to the present invention;
FIG. 6 is a schematic view of an extrusion needle in a magnesium alloy tubule manufacturing device with separated rod and needle according to the present invention;
FIG. 7 is a demoulding device in a magnesium alloy tubule manufacturing device for separating a rod needle.
Detailed Description
The invention is further illustrated below with reference to specific examples, in which: the following examples are only for illustrating the specific implementation method of the present invention and are not intended to limit the scope of the present invention.
Example 1
The embodiment relates to a method for preparing a magnesium alloy thin pipe with a separated rod and a separated needle, which comprises the following steps:
(1) performing linear cutting, turning and punching on the Mg-1.84Zn-0.31Mn-0.18Ca alloy cast ingot to obtain a hollow cylindrical blank, wherein the outer diameter of the hollow cylindrical blank is 30mm, the height of the hollow cylindrical blank is 15mm, and the diameter of a middle through hole is 6.5 mm;
(2) smearing graphite-based lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating the extrusion container to 400 ℃, putting the extrusion container into a hollow cylindrical blank;
(3) and (3) taking out the die and the blank, assembling the die and the blank on an extrusion die holder in a combined manner, installing the die and the blank, and extruding the blank when the temperature is reduced to 380 ℃, wherein the extrusion ratio is 30.6:1, and the extrusion speed is 2mm/s, so that the seamless extruded tube is obtained.
(4) After extrusion, the extrusion cylinder, the extrusion female die, the extrusion needle pad and the formed pipe are integrally taken down, then the demolding frame is placed in the fixed sleeve to realize demolding, and finally the magnesium alloy thin pipe with the outer diameter of 8mm, the inner diameter of 6mm and the wall thickness of 1mm is obtained.
The implementation effect is as follows: the magnesium alloy thin tube prepared by the embodiment has good surface quality, accurate size and uniform wall thickness, the difference rate of the front end wall is 4.18 percent, the difference rate of the tail end wall is 2.00 percent, the tensile strength is 262MPa, the yield strength is 130MPa, and the elongation is 15.5 percent.
Example 2
The embodiment relates to a method for preparing a magnesium alloy thin pipe with a separated rod and a separated needle, which comprises the following steps:
(1) performing linear cutting, turning and punching on the Mg-1.85Zn-0.21Mn-0.21Ca alloy cast ingot to obtain a hollow cylindrical blank, wherein the outer diameter of the hollow cylindrical blank is 30mm, the height of the hollow cylindrical blank is 15mm, and the diameter of a middle through hole is 6.5 mm;
(2) smearing graphite-based lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating the extrusion container to 400 ℃, putting the extrusion container into a hollow cylindrical blank;
(3) and (3) taking out the die and the blank, assembling the die and the blank on an extrusion die holder in a combined manner, installing the die and the blank, and extruding the blank when the temperature is reduced to 360 ℃, wherein the extrusion ratio is 13.4:1, and the extrusion speed is 3mm/s, so that the seamless extruded tube is obtained.
(4) After extrusion, the extrusion cylinder, the extrusion female die, the extrusion needle pad and the formed pipe are integrally taken down, then the demolding frame is placed in the fixed sleeve to realize demolding, and finally the magnesium alloy thin pipe with the outer diameter of 10mm, the inner diameter of 6mm and the wall thickness of 2mm is obtained.
The implementation effect is as follows: the magnesium alloy thin tube prepared by the embodiment has good surface quality, accurate dimension and uniform wall thickness, the difference rate of the front end wall is 4%, the difference rate of the tail end wall is 1.95%, the tensile strength is 245MPa, the yield strength is 120MPa, and the elongation is 14.5%.
The embodiment relates to a method for preparing a magnesium alloy thin pipe with a separated rod and a separated needle, which comprises the following steps:
(1) performing linear cutting, turning and punching on the Mg-4.11Zn-0.26Mn-0.16Ca alloy cast ingot to obtain a hollow cylindrical blank, wherein the outer diameter of the hollow cylindrical blank is 30mm, the height of the hollow cylindrical blank is 15mm, and the diameter of a middle through hole is 6.5 mm;
(2) smearing graphite-based lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating the extrusion container to 420 ℃, putting the extrusion container into a hollow cylindrical blank;
(3) and (3) taking out the die and the blank, assembling the die and the blank on an extrusion die holder in a combined manner, installing the die and the blank, and extruding the blank when the temperature is reduced to 390 ℃, wherein the extrusion ratio is 30.6:1, and the extrusion speed is 3mm/s, so that the seamless extruded tube is obtained.
(4) After extrusion, the extrusion cylinder, the extrusion female die, the extrusion needle pad and the formed pipe are integrally taken down, then the demolding frame is placed in the fixed sleeve to realize demolding, and finally the magnesium alloy thin pipe with the outer diameter of 8mm, the inner diameter of 6mm and the wall thickness of 1mm is obtained.
The implementation effect is as follows: the magnesium alloy thin tube prepared by the embodiment has good surface quality, accurate dimension and uniform wall thickness, the difference rate of the front end wall is 3 percent, the difference rate of the tail end wall is 1.90 percent, the tensile strength is 275MPa, the yield strength is 150MPa, and the elongation is 16.0 percent.
Example 4
The embodiment relates to a method for preparing a magnesium alloy thin pipe with a separated rod and a separated needle, which comprises the following steps:
(1) performing linear cutting, turning and punching on the Mg-3.95Zn-0.30Mn-0.18Ca alloy cast ingot to obtain a hollow cylindrical blank, wherein the outer diameter of the hollow cylindrical blank is 30mm, the height of the hollow cylindrical blank is 15mm, and the diameter of a middle through hole is 6.5 mm;
(2) smearing graphite-based lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating the extrusion container to 430 ℃, putting the extrusion container into a hollow cylindrical blank;
(3) and (3) taking out the die and the blank, assembling the die and the blank on an extrusion die holder in a combined manner, installing the die and the blank, and extruding the blank when the temperature is reduced to 400 ℃, wherein the extrusion ratio is 66:1, and the extrusion speed is 2.5mm/s, so that the seamless extruded tube is obtained.
(4) After extrusion is finished, the extrusion cylinder, the extrusion female die, the extrusion needle pad and the formed pipe are integrally taken down, then the demolding frame is placed in the fixed sleeve to realize demolding, and finally the magnesium alloy thin pipe with the outer diameter of 5mm, the inner diameter of 3.4mm and the wall thickness of 0.8mm is obtained.
The implementation effect is as follows: the magnesium alloy thin tube prepared by the embodiment has good surface quality, accurate dimension and uniform wall thickness, the difference rate of the front end wall is 3 percent, the difference rate of the tail end wall is 1.80 percent, the tensile strength is 273MPa, the yield strength is 136MPa, and the elongation is 15.3 percent.
Although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the following claims.
Claims (7)
1. A device and a method for preparing a magnesium alloy thin tube with separated rod and needle are characterized in that: the device mainly comprises an extrusion rod, an extrusion needle pad, an extrusion female die, a female die pad, an extrusion cylinder, a fixed sleeve, an extrusion die holder and a die releasing frame. The extrusion rod is assembled on an upper sliding block of the four-column hydraulic press, and the extrusion die base is assembled on a base of the four-column hydraulic press and is fixed by hexagon socket head screws respectively; the cylindrical fixing sleeve is axially and vertically fixed on the extrusion die holder, the extrusion cylinder is coaxially nested in the fixing sleeve, a central hole with a relatively large diameter is formed in the center of the bottom of the extrusion cylinder and used for assembling an extrusion female die, and a central through hole with a relatively small diameter is formed in the upper part of the central hole with the relatively large diameter and used for assembling an extrusion needle, an extrusion needle pad, an extrusion rod and a blank; the female die pad is arranged in a preformed hole on the upper surface of the extrusion die seat, and the extrusion female die is assembled above the female die pad and is matched with the extrusion container; the center of the extrusion female die is provided with a through hole, the upper part of the hole is a variable hole with gradually reduced diameter, the section of the variable hole is a 90-degree transition circular arc, the diameter of the circular arc at the lower end of the variable hole is vertical to the central axis of the variable hole, a small straight hole with relatively smaller diameter is arranged below the variable hole, the diameter of the small straight hole is the same as that of the lower end of the variable hole, the straight hole is a pipe outer diameter forming hole, and a large straight hole with relatively larger diameter is arranged below the small straight hole; the blank is arranged in a central through hole with a relatively small diameter of an extrusion cylinder above an extrusion female die, an extrusion needle pad is positioned above the blank, an extrusion needle and the extrusion needle pad are installed in a matched mode, the extrusion needle pad plays a role in supporting and fixing the extrusion needle, meanwhile, the tip end of the extrusion needle extends downwards into the blank, the whole matching device formed by the extrusion needle and the extrusion needle pad can freely move up and down in the extrusion cylinder, the upper surface of the whole matching device formed by the extrusion needle and the extrusion needle pad is a flush end, and a positioning groove is formed in the central position of the extrusion needle; the lower surface of the extrusion needle pad, the outer side of the extrusion needle, the extrusion die hole and the inner wall of the extrusion container form an extrusion cavity; the center of the lower surface of the extrusion rod is provided with a coordination bulge which is used for being matched with a coordination groove of the extrusion needle, and the function of positioning is achieved. The demoulding frame is two symmetrical round built-in boss parts which are matched for use to realize the demoulding of the pipe.
According to the device and the method for preparing the magnesium alloy tubule with the separated rod and needle, the extrusion rod, the lower die holder and the fixed sleeve are fixedly assembled, and other parts are non-fixedly assembled.
According to the device and the method for preparing the magnesium alloy thin pipe with the separated rod and needle, the extrusion rod is separated from the extrusion needle, the extrusion needle is installed in a matched mode with the extrusion needle pad, the positioning is arranged between the extrusion rod and the extrusion needle, the extrusion needle can freely move in the extrusion barrel to a certain degree in the extrusion process, automatic centering is achieved, the size precision of the pipe is improved, the extrusion needle and the extrusion female die are convenient to replace at any time, and the diameter and the wall thickness size of the pipe are changed by adjusting the matching of the extrusion needle and the extrusion female die.
According to the device and the method for preparing the magnesium alloy thin pipe with the separated rod and needle, the extrusion cylinder, the extrusion female die, the extrusion needle pad and the blank can be placed in a resistance furnace together for heating in the pipe processing and preparing process, and the whole body is heated uniformly; after the extrusion, because the connection effect of shaping tubular product, recipient, extrusion die, extrusion needle, extrusion cushion and shaping tubular product can form a whole, wholly take off it, then put into fixed cover with two drawing of patterns frame combinations, put into the drawing of patterns frame with the part that wholly takes off again in, the ejector beam of moving downwards will extrude cushion, extrusion needle, shaping tubular product and extrusion die and extrude the die and extrude from the recipient inner chamber, realize the drawing of patterns.
2. The device and the method for preparing the magnesium alloy tubule separated by the rod and the needle according to claim 1 are characterized by comprising the following steps:
(1) processing a magnesium alloy ingot into a hollow cylindrical blank;
(2) uniformly smearing a lubricant on the inner wall of the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad, then putting the extrusion container, the wall of the extrusion female die hole, the surface of the extrusion needle and the lower surface of the extrusion needle pad into a resistance furnace, heating to 400-450 ℃, then putting the hollow cylindrical blank obtained in the step (1) into the resistance furnace, and preserving heat for 3-;
(3) taking out the extrusion container, the extrusion female die, the extrusion needle pad and the hollow cylindrical blank from the resistance furnace, assembling the components on an extrusion die seat, and extruding to obtain a seamless pipe;
(4) and (4) after extrusion, demolding, and taking out the prepared magnesium alloy seamless pipe.
3. The method for preparing the magnesium alloy fine pipe for rod and needle separation according to claim 2 is characterized in that the magnesium alloy fine pipes with different sizes are prepared by changing the size matching of the extrusion needle and the female die, and the extrusion ratio is 10-70.
4. The method for preparing the magnesium alloy fine tube for separating the rod needle according to claim 2, wherein in the step (1), the outer diameter of the hollow cylindrical blank is 30-40 mm, and the diameter of the middle through hole is 3.5-6.5 mm.
5. The method for preparing the magnesium alloy tubule for separating the rod needle according to claim 2, wherein the lubricant in the step (2) is graphite-based or molybdenum disulfide-based lubricating grease which is uniformly coated on the inner wall of the extrusion cylinder, the wall of the hole of the extrusion female die, the surface of the extrusion needle and the lower surface of the extrusion needle pad before heating.
6. The method for preparing the magnesium alloy fine tube for rod and needle separation according to claim 2, wherein in the step (3), the contact thermocouple or the infrared thermometer detects the temperature of the outer surface of the extrusion cylinder, the extrusion is carried out when the temperature is 350-420 ℃, and the extrusion speed is 0.5-10 mm/s.
7. The method for preparing the magnesium alloy thin pipe with the separated rod and needle according to claim 2, wherein the diameter of the cross section of the finally obtained magnesium alloy thin pipe is 5-10 mm, and the wall thickness is 0.8-2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011025208.0A CN112246903A (en) | 2020-09-25 | 2020-09-25 | A kind of preparation device and method of magnesium alloy thin tube separated by rod and needle |
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| CN202011025208.0A CN112246903A (en) | 2020-09-25 | 2020-09-25 | A kind of preparation device and method of magnesium alloy thin tube separated by rod and needle |
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| CN1507962A (en) * | 2002-12-18 | 2004-06-30 | 中国科学院金属研究所 | A kind of processing method of superalloy tube billet |
| EP1563920A1 (en) * | 2004-02-10 | 2005-08-17 | Vai Clecim | Tube extrusion press |
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| CN101109061A (en) * | 2007-08-10 | 2008-01-23 | 中国兵器工业第五二研究所 | Room temperature hydrostatic liquid extrusion pressing deforming strengthening technique of magnesium alloy |
| CN101700537A (en) * | 2009-11-20 | 2010-05-05 | 北京科技大学 | A simulation extrusion device for thin-wall superalloy pipe |
| CN107327690A (en) * | 2017-08-23 | 2017-11-07 | 北京工业大学 | A kind of controllable magnesium alloy tubule of wall thickness and preparation method thereof |
| CN108015116A (en) * | 2017-12-26 | 2018-05-11 | 北京大学深圳研究院 | Rare earth strengthens magnesium-zinc alloy seamless tubular goods hot extrusion technique and temperature control extrusion die |
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| CN1507962A (en) * | 2002-12-18 | 2004-06-30 | 中国科学院金属研究所 | A kind of processing method of superalloy tube billet |
| EP1563920A1 (en) * | 2004-02-10 | 2005-08-17 | Vai Clecim | Tube extrusion press |
| CN1824402A (en) * | 2006-03-23 | 2006-08-30 | 沈阳理工大学 | Alloy pipe hot extrusion method and extrusion die |
| CN101109061A (en) * | 2007-08-10 | 2008-01-23 | 中国兵器工业第五二研究所 | Room temperature hydrostatic liquid extrusion pressing deforming strengthening technique of magnesium alloy |
| CN101700537A (en) * | 2009-11-20 | 2010-05-05 | 北京科技大学 | A simulation extrusion device for thin-wall superalloy pipe |
| CN107327690A (en) * | 2017-08-23 | 2017-11-07 | 北京工业大学 | A kind of controllable magnesium alloy tubule of wall thickness and preparation method thereof |
| CN108015116A (en) * | 2017-12-26 | 2018-05-11 | 北京大学深圳研究院 | Rare earth strengthens magnesium-zinc alloy seamless tubular goods hot extrusion technique and temperature control extrusion die |
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