CN110722016A - Medium-small caliber thick-wall metal pipe and preparation method thereof - Google Patents
Medium-small caliber thick-wall metal pipe and preparation method thereof Download PDFInfo
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- CN110722016A CN110722016A CN201810783775.9A CN201810783775A CN110722016A CN 110722016 A CN110722016 A CN 110722016A CN 201810783775 A CN201810783775 A CN 201810783775A CN 110722016 A CN110722016 A CN 110722016A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- 239000002184 metal Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 49
- 238000005242 forging Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 42
- 239000002131 composite material Substances 0.000 claims description 36
- 230000007246 mechanism Effects 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000006698 induction Effects 0.000 claims description 18
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000003856 thermoforming Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F23/00—Feeding wire in wire-working machines or apparatus
- B21F23/005—Feeding discrete lengths of wire or rod
-
- 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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
- B21B17/12—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills in a discontinuous process, e.g. plug-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
- B21H1/20—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling rolled longitudinally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/02—Special design or construction
- B21J7/18—Forging machines working with die jaws, e.g. pivoted, movable laterally of the forging or pressing direction, e.g. for swaging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a small-caliber thick-wall metal pipe and a preparation method thereof. The diameter range of the cross section of the metal pipe is 30-160 mm, the size precision is +/-0.2 mm, and the ratio of the outer diameter of the metal pipe to the wall thickness is more than 2 and less than or equal to 20. The inner and outer walls of the metal tube are free of scale, dents or cracks. The metal pipe is made of steel, copper, aluminum, magnesium, titanium or alloy. The invention has the characteristics of forging and rolling, can realize the single-pass and large-deformation processing of the metal tube blank, has short process flow, high product dimensional precision (plus or minus 0.2mm), good surface quality of the inner wall and the outer wall and low cost.
Description
Technical Field
The invention relates to the technical field of metal pipe material processing, in particular to a medium and small caliber thick-wall metal pipe and a preparation method thereof.
Background
At present, the methods for forming the metal pipe with the medium-small caliber and the thick wall (D/S is within the range of 2-20) mainly comprise extrusion, rolling and the like, wherein the extrusion forming production efficiency is low, so the product cost is high, the market competitiveness is not provided, and the method is usually used for producing a few metal pipes which cannot be produced or are difficult to produce by other processes. The hot rolling forming mainly comprises periodic tube rolling, three-roll skew rolling forming, tension reducing forming and the like.
The pipe is fed into a rolling groove consisting of a core rod and a hole pattern which moves in a reciprocating mode periodically according to a certain frequency, and the inner wall of the pipe is supported by the core rod and rolls the pipe blank by the aid of the gradually contracted hole pattern with the variable cross section, so that the functions of reducing the diameter and the wall are achieved. The pilger mill is mainly a two-roller pilger mill, but because the frame and the rollers reciprocate in the rolling process, a plurality of moving parts and large inertia cause poor stability in the rolling process, the structure of the mill is complex, and the maintenance and the adjustment are difficult; the pipe rolled by the two-high rolling mill has low dimensional precision and poor surface quality.
Three rollers of the three-roller skew rolling mill are uniformly distributed around a rolling central line at an angle of 120 degrees, and the axes of the rollers and the rolling central line are inclined and crossed to form a certain angle (namely a rolling angle and a feeding angle), so that the pipe blank spirally advances under the action of the rollers, the outer surface of the rolled pipe blank forms a spiral line, the surface quality is influenced, and the tail part is easy to generate a triangular defect to cause rolling jamming.
The three-roller tension reducing mill generally comprises a series of pass formed by more than 10 frames, and tension is provided by the speed difference of the rotating speeds of the rollers of the adjacent frames, so that the hollow reducing of the tube blank is completed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a medium and small caliber thick-wall metal pipe and a preparation method thereof. The invention has the characteristics of forging and rolling, can realize the single-pass and large-deformation processing of the metal tube blank, has short process flow, high product dimensional precision (plus or minus 0.2mm), good surface quality of the inner wall and the outer wall and low cost.
The invention aims to provide a medium and small caliber thick-wall metal pipe.
The diameter range of the cross section of the metal pipe is 30-160 mm, the size precision is +/-0.2 mm, and the ratio of the outer diameter of the metal pipe to the wall thickness is more than 2 and less than or equal to 20.
Preferably:
the diameter range of the cross section of the metal pipe is 30-100 mm;
the ratio of the outer diameter to the wall thickness of the metal pipe is more than 2 and less than or equal to 12; more preferably from more than 2 to 10 or less; most preferably from greater than 2 to 5 or less.
The inner and outer walls of the metal tube are free of scale, dents or cracks.
The material of the metal pipe is preferably steel, copper, aluminum, magnesium, titanium or alloy.
The second purpose of the invention is to provide a method for preparing a medium and small caliber thick-wall metal pipe.
The method comprises the following steps:
(1) selecting a tube blank, and cutting to length;
(2) the tube blank is arranged on a feeding rack, the tail end of the tube blank is clamped by a clamping device, the front end of the tube blank is supported by a supporting roll, and a core die device is ensured to penetrate through an inner hole of the tube blank;
(3) feeding the tube blank by a feeding mechanism before each pass starts at a feeding speed of 1-3 m/min for 5-30 mm, and enabling the tube blank to enter a composite forging and rolling forming device for forming;
(4) after the tube blank is formed in a composite forging and rolling forming device for each time, rotating the tube blank for 15-90 degrees around the central axis of the tube blank;
(5) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously advancing the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed;
(6) cooling and cutting to length.
Among them, preferred are:
step (1), the outer diameter of the pipe blank is 40-180 mm, and the fixed length is 0.5-10 m.
Step (3), when cold forming is carried out, the tube blank is fed and then directly fed into a composite forging and rolling forming device; when hot forming is performed, the billet is heated to a target temperature by an induction heating device and then fed into a composite forging and rolling forming device.
And (3) during thermoforming, the induction heating device is a medium-frequency induction heating coil, and the target temperature range is 800-1200 ℃.
The composite forging and rolling forming device is composed of three swinging die blocks, the die blocks are arranged at 120-degree equal intervals around the central axis of a pipe blank, the die blocks synchronously swing through a crank connecting rod mechanism driven by a motor, the die blocks rotate around connecting shafts of the die blocks and do reciprocating linear motion along the connecting shafts, straight gears connected through flat keys are installed at two ends of the connecting shafts, and the moving displacement and the rotating angle of the die are controlled by the straight gears.
The invention can adopt the following technical scheme:
the process comprises the following steps: (1) selecting a proper tube blank, and cutting to length; (2) the tube blank is arranged on a feeding rack, the tail end of the tube blank is clamped by a clamping device, the front end of the tube blank is supported by a supporting roll, and a core die device is ensured to penetrate through an inner hole of the tube blank; (3) feeding the pipe blank by a feeding mechanism before each pass starts at a feeding speed of 1-3 m/min for 5-30 mm, directly feeding the pipe blank into a composite forging and rolling forming device after feeding when cold forming is carried out, and feeding the pipe blank into the composite forging and rolling forming device after the pipe blank is heated to a target temperature by an induction heating device when hot forming is carried out; (4) after the tube blank is formed once in the composite forging and rolling forming device, rotating the tube blank for 15-90 degrees around the central axis of the tube blank, feeding the tube blank for 5-30 mm again, and feeding the tube blank into the composite forging and rolling forming device again for forming; (5) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously advancing the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed; (6) cooling and shear to length
The process mainly comprises the following steps:
(1) selecting a proper tube blank, and cutting to length;
(2) the tube blank is arranged on a feeding rack, the tail end of the tube blank is clamped by a clamping device, the front end of the tube blank is supported by a supporting roll, and a core die device is ensured to penetrate through an inner hole of the tube blank;
(3) feeding the pipe blank by a feeding mechanism before each pass starts at a feeding speed of 1-3 m/min for 5-30 mm, directly feeding the pipe blank into a composite forging and rolling forming device after feeding when cold forming is carried out, and feeding the pipe blank into the composite forging and rolling forming device after the pipe blank is heated to a target temperature by an induction heating device when hot forming is carried out;
(4) after the tube blank is formed once in the composite forging and rolling forming device, rotating the tube blank for 15-90 degrees around the central axis of the tube blank, feeding the tube blank for 5-30 mm again, and feeding the tube blank into the composite forging and rolling forming device again for forming;
(5) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously advancing the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed;
(6) cooling and cutting to length.
The blank selected by the invention comprises a high-frequency straight welded pipe and a seamless pipe, the material requirements comprise a steel pipe and non-ferrous metal pipes such as aluminum, copper, magnesium, titanium and the like, the outer diameter of the pipe blank is 40-180 mm, and the fixed length is 0.5-10 m.
The forming die comprises three swinging die blocks which are arranged at equal intervals around the central axis of a pipe blank by 120 degrees, the die blocks synchronously swing through a crank link mechanism driven by a motor, the die blocks rotate around a connecting shaft of the die blocks, the connecting shaft does reciprocating linear motion, and the moving displacement and the rotating angle of the die blocks strictly correspond to each other.
The feeding speed of the blank is 1-3 m/min, and the feeding amount of each time is 5-30 mm;
the process can be carried out in two forming modes of cold and hot, wherein the induction heating device in the step (3) is a medium-frequency induction heating coil, and the forming temperature interval is 800-1200 ℃;
the invention is suitable for forming medium and small-caliber metal pipes made of various metal materials, the range of the outer diameter of a product is 30-160 mm, and the ratio (D/S) of the outer diameter of the product to the wall thickness of the product is more than 2 and less than or equal to 20.
The size precision of the metal tube product obtained in the invention is +/-0.2 mm;
the technical scheme of the invention has the following beneficial effects:
(1) the single-pass and large-deformation variable-section processing of the metal pipe blank can be realized;
(2) the process flow is short, and the equipment investment is small;
(3) the product has high dimensional accuracy (plus or minus 0.2mm) and good surface quality of the inner wall and the outer wall;
(4) the process has the characteristics of forging and rolling, the deformation mass point is in a three-dimensional compressive stress state, and the process can be used for cold and hot forming of small-caliber metal pipes made of various metal materials.
Drawings
FIG. 1 is a schematic view of a composite forged and rolled metal tube forming machine of the present invention;
FIG. 2 is a schematic illustration of the transmission of the present invention;
FIG. 3 is a schematic view of the present invention compound forging and roll forming apparatus;
FIG. 4 is a side sectional view of FIG. 3;
FIG. 5 is a schematic view of an induction heating coil of the present invention;
fig. 6 is a schematic view of a core mold device of the present invention;
FIG. 7 is a schematic view of a feed device of the present invention;
fig. 8 is a schematic view of a receiving device of the invention;
FIG. 9 is a schematic representation of a small gauge thick wall metal tube product of the present invention;
fig. 10 is a schematic cross-sectional view of fig. 9.
Description of reference numerals:
1, a material receiving rack; 2, driving the frame; 3 forming the frame; 4 an induction heating coil; 5, an induction heating equipment control cabinet; 6, blank material; 7, core molding; 8, a feeding rack; 9 eccentric wheel connecting rod; 10 forming a frame base; 11 a main transmission shaft; 12 mutually meshed transmission bevel gears A; 13 mutually meshed transmission bevel gears B; 14 mutually meshing transmission bevel gears C; 15 mutually meshed transmission bevel gears D; 16 an intermediate drive shaft; 17 an eccentric wheel shaft; 18 eccentric wheel; 19 connecting the shafts; 20 bearing seat connecting rods; 21 sector-shaped mold blocks; 22 a mold shaft; a 23-stroke spur gear; 24 racks; 25, a mold track frame; 26 feeding and supporting rolls; 27 hydraulic chucks; 28 servo motor; 29 a reduction pinion; 30 a reduction gear wheel; 31 a chuck base; 32 a walking trolley; 33 a walking trolley guide wheel; 34 positioning the guide rail; 35 core mold positioning seats; 36 a feeding platform; 37 support legs; 38 a traveling carriage motor; 39 to receive the material supporting roller.
Detailed Description
The present invention will be further described with reference to the following examples.
A steel pipe 6 is used as a blank, the pipe blank is arranged on a feeding rack 7, the tail end of the pipe blank is clamped by a hydraulic chuck 27, meanwhile, a core die device 7 penetrates through an inner hole of the pipe blank, the blank is fed into the feeding rack by 25mm at a feeding speed of 1.5m/min, and the pipe blank enters an induction heating coil 4 to be heated to 1000 ℃ and then enters a forming rack 3. After the tube blank is formed once in the composite forging and rolling forming device, the tube blank rotates 60 degrees around the central axis of the tube blank and is fed for forming by 25mm again until the front end of the tube blank enters the material receiving rack 1, the material receiving mechanism clamps the front end of the tube blank, meanwhile, the material receiving rack loosens the tail end of the tube blank, the tube blank continues to advance under the driving of the material receiving mechanism until the whole tube blank is formed, and the tube blank is cut to length after being cooled.
Example 1
(1) Selecting a Q235 high-frequency straight welded pipe as a blank, wherein the original outer diameter of the blank is 86mm, the wall thickness is 4.5mm, and the fixed length is 3 m;
(2) the tube blank is arranged on a feeding rack, the front end of the tube blank is supported by a supporting roll, the tail end of the tube blank is fastened by a clamping device, a core die device is ensured to penetrate through the inner hole of the tube blank, and the diameter of the straight line section of a core rod is 54 mm;
(3) feeding the pipe blank into a feeding mechanism before each pass starts at a feeding speed of 1.5m/min for 25mm, heating the blank to 1000 ℃ through an induction heating coil, and feeding the heated blank into a composite forging and rolling forming device;
(4) after the tube blank is formed in the composite forging and rolling forming device once, rotating the tube blank by 60 degrees around the central axis of the tube blank, feeding the tube blank into the composite forging and rolling forming device again by 25mm, heating the tube blank by an induction coil, and feeding the tube blank into the composite forging and rolling forming device again for forming;
(5) and (4) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously moving the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed.
(6) Cooling and cutting to length;
the outer diameter of the tube blank obtained by the forming process is 65mm, the wall thickness is 5.5mm, the dimensional accuracy of the product is +/-0.2 mm, and the inner wall and the outer wall have no defects such as warping, pits and the like.
Example 2
(1) Selecting a 08Al seamless steel tube as a blank, wherein the original outer diameter of the blank is 60mm, the wall thickness is 3.8mm, and the fixed length is 5 m;
(2) the tube blank is arranged on a feeding rack, the front end of the tube blank is supported by a supporting roll, the tail end of the tube blank is fastened by a clamping device, a core die device is ensured to penetrate through the inner hole of the tube blank, and the diameter of the straight line section of the mandrel is 25 mm;
(3) feeding the pipe blank into a composite forging and rolling forming device by a feeding mechanism before each pass starts at a feeding speed of 2m/min for 20mm, heating the blank to 900 ℃ by an induction heating coil, and feeding the heated blank into the composite forging and rolling forming device;
(4) after the tube blank is formed once in the composite forging and rolling forming device, rotating the tube blank by 75 degrees around the central axis of the tube blank, feeding the tube blank by 20mm again, heating the tube blank by an induction coil, and feeding the tube blank into the composite forging and rolling forming device again for forming;
(5) and (4) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously moving the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed.
(6) Cooling and cutting to length;
the outer diameter of the tube blank obtained by the forming process is 35mm, the wall thickness is 5mm, the product size precision is +/-0.18 mm, and the inner wall and the outer wall have no defects such as warping, pits and the like.
Example 3
(1) Selecting a red copper tube as a blank, wherein the original outer diameter of the blank is 60mm, the wall thickness is 4mm, and the fixed length is 6 m;
(2) the tube blank is arranged on a feeding rack, the front end of the tube blank is supported by a supporting roll, the tail end of the tube blank is fastened by a clamping device, a core die device is ensured to penetrate through the inner hole of the tube blank, and the diameter of the straight line section of the mandrel is 18 mm;
(3) feeding the pipe blank into a composite forging and rolling forming device at a feeding speed of 3m/min by a feeding mechanism before each pass begins, wherein the feeding mechanism feeds the pipe blank into the composite forging and rolling forming device by a feeding speed of 10 mm;
(4) after the tube blank is formed once in the composite forging and rolling forming device, rotating the tube blank for 45 degrees around the central axis of the tube blank, feeding the tube blank for 10mm again, and feeding the tube blank into the composite forging and rolling forming device again for forming;
(5) and (4) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously moving the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed.
(6) Cutting to length;
the aluminum pipe product obtained by adopting the cold forming process has the outer diameter of 30mm, the wall thickness of 6.5mm, smooth inner and outer walls, no defects of warping, pits and the like, and the size precision of the product is +/-0.2 mm.
Example 4
(1) Selecting a pure aluminum tube as a blank, wherein the original outer diameter of the blank is 140mm, the wall thickness is 10mm, and the fixed length is 8 m;
(2) the tube blank is arranged on a feeding rack, the front end of the tube blank is supported by a supporting roll, the tail end of the tube blank is fastened by a clamping device, a core die device is ensured to penetrate through the inner hole of the tube blank, and the diameter of the straight line section of the mandrel is 85 mm;
(3) feeding the pipe blank into a composite forging and rolling forming device at a feeding speed of 3m/min by a feeding mechanism before each pass begins, wherein the feeding mechanism feeds the pipe blank into the composite forging and rolling forming device by 8 mm;
(4) after the tube blank is formed once in the composite forging and rolling forming device, rotating the tube blank by 25 degrees around the central axis of the tube blank, feeding the tube blank by 8mm again, and feeding the tube blank into the composite forging and rolling forming device again for forming;
(5) and (4) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously moving the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed.
(6) Cutting to length;
the aluminum pipe product obtained by adopting the cold forming process has the outer diameter of 110mm, the wall thickness of 12.5mm, smooth inner and outer walls, no defects of warping, pits and the like, and the size precision of the product is +/-0.2 mm.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for the ordinary skill in the art, numerous modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations should be considered within the scope of the present invention.
Claims (10)
1. A small-caliber thick-wall metal pipe is characterized in that:
the diameter range of the cross section of the metal pipe is 30-160 mm, the size precision is +/-0.2 mm, and the ratio of the outer diameter of the metal pipe to the wall thickness is more than 2 and less than or equal to 20.
2. The small-caliber thick-wall metal tube according to claim 1, wherein:
the diameter range of the cross section of the metal pipe is 30-100 mm;
the ratio of the outer diameter to the wall thickness of the metal pipe is more than 2 and less than or equal to 12.
3. The small-caliber thick-wall metal tube according to claim 2, wherein:
the ratio of the outer diameter to the wall thickness of the metal pipe is more than 2 and less than or equal to 10.
4. The small-caliber thick-wall metal tube according to claim 1, wherein:
the inner and outer walls of the metal tube are free of scale, dents or cracks.
5. The small-caliber thick-wall metal pipe according to any one of claims 1 to 4, wherein:
the metal pipe is made of steel, copper, aluminum, magnesium, titanium or alloy.
6. A method for producing a medium-small diameter thick-walled metal tube according to any one of claims 1 to 5, wherein the method comprises:
(1) selecting a tube blank, and cutting to length;
(2) the tube blank is arranged on a feeding rack, the tail end of the tube blank is clamped by a clamping device, the front end of the tube blank is supported by a supporting roll, and a core die device is ensured to penetrate through an inner hole of the tube blank;
(3) feeding the tube blank by a feeding mechanism before each pass starts at a feeding speed of 1-3 m/min for 5-30 mm, and enabling the tube blank to enter a composite forging and rolling forming device for forming;
(4) after the tube blank is formed in the composite forging and rolling forming device every time, rotating the tube blank for 15-90 degrees around the central axis of the tube blank;
(5) repeating the process steps (3) and (4) until the front end of the tube blank enters the material receiving rack, clamping the front end of the tube blank by the material receiving mechanism, loosening the tail end of the tube blank by the material feeding rack, and continuously advancing the tube blank under the driving of the material receiving mechanism until the whole tube blank is formed;
(6) cooling and cutting to length.
7. The method of making a small-caliber thick-wall metal tube of claim 6, wherein:
step (1), the outer diameter of the pipe blank is 40-180 mm, and the fixed length is 0.5-10 m.
8. The method for preparing a small-caliber thick-wall metal pipe according to claim 6, wherein:
step (3), when cold forming is carried out, feeding the pipe blank and then directly feeding the pipe blank into a composite forging and rolling forming device; when hot forming is performed, the billet is heated to a target temperature by an induction heating device and then fed into a composite forging and rolling forming device.
9. A method for preparing a small-caliber thick-wall metal pipe as claimed in claim 8, wherein:
and (3) during thermoforming, the induction heating device is a medium-frequency induction heating coil, and the target temperature range is 800-1200 ℃.
10. The method for preparing a small-caliber thick-wall metal pipe according to claim 6, wherein:
the composite forging and rolling forming device is composed of three swinging die blocks, the die blocks are arranged at 120-degree equal intervals around the central axis of a pipe blank, the die blocks synchronously swing through a crank connecting rod mechanism driven by a motor, the die blocks rotate around connecting shafts of the die blocks and do reciprocating linear motion along the connecting shafts, straight gears connected through flat keys are installed at two ends of the connecting shafts, and the moving displacement and the rotating angle of the die are controlled by the straight gears.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810783775.9A CN110722016A (en) | 2018-07-17 | 2018-07-17 | Medium-small caliber thick-wall metal pipe and preparation method thereof |
| EP19838335.8A EP3812056A4 (en) | 2018-07-17 | 2019-07-09 | Medium/small-diameter thick-walled metal tube and preparation method therefor |
| JP2021525350A JP7106004B2 (en) | 2018-07-17 | 2019-07-09 | Medium and small diameter thick-walled metal pipe and its manufacturing method |
| PCT/CN2019/095282 WO2020015556A1 (en) | 2018-07-17 | 2019-07-09 | Medium/small-diameter thick-walled metal tube and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810783775.9A CN110722016A (en) | 2018-07-17 | 2018-07-17 | Medium-small caliber thick-wall metal pipe and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110722016A true CN110722016A (en) | 2020-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810783775.9A Pending CN110722016A (en) | 2018-07-17 | 2018-07-17 | Medium-small caliber thick-wall metal pipe and preparation method thereof |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3812056A4 (en) |
| JP (1) | JP7106004B2 (en) |
| CN (1) | CN110722016A (en) |
| WO (1) | WO2020015556A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114260327A (en) * | 2021-12-20 | 2022-04-01 | 大连理工大学 | Method for preparing axial variable cross-section pipe by radial continuous extrusion |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769352A (en) * | 2022-03-21 | 2022-07-22 | 温州英特不锈钢有限公司 | Stainless steel pipe forming method |
| CN114833296B (en) * | 2022-05-25 | 2023-07-25 | 江苏明越精密高温合金有限公司 | Blank making equipment for tube blank |
| CN115608900B (en) * | 2022-12-16 | 2023-02-24 | 太原理工大学 | Metal clad material wave-flat radial forging compound equipment and method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2021530363A (en) | 2021-11-11 |
| EP3812056A1 (en) | 2021-04-28 |
| WO2020015556A1 (en) | 2020-01-23 |
| JP7106004B2 (en) | 2022-07-25 |
| EP3812056A4 (en) | 2021-09-22 |
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