CN104154796A - Internal-thread heat exchange pipe and manufacturing process thereof - Google Patents
Internal-thread heat exchange pipe and manufacturing process thereof Download PDFInfo
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- CN104154796A CN104154796A CN201410368145.7A CN201410368145A CN104154796A CN 104154796 A CN104154796 A CN 104154796A CN 201410368145 A CN201410368145 A CN 201410368145A CN 104154796 A CN104154796 A CN 104154796A
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Abstract
The invention relates to an internal-thread heat exchange pipe and a manufacturing process thereof. The internal-thread heat exchange pipe comprises a metal pipe body, a welding seam is arranged along the axis direction of the metal pipe body, a rib is arranged on each of two sides of the welding seam and is parallel to the welding seam, a spiral area is arranged between the ribs and provided with multiple spiral teeth, and one end of at least one spiral tooth is connected with the first rib while the other end of the same is connected with the second rib. The manufacturing process includes the steps of unwinding through an unwinder, tooth form rolling forming, forming of a round pipe through multi-roller rolling, high-frequency guided extrusion welding and annealing. Measures for preventing wave deformation of edges at two ends of a metal belt are adopted, so that height size of the spiral teeth can be further increased than that of previous products; the internal-thread heat exchange pipe has high heat exchange performance that previous common-tooth-form internal-thread pipes do not have. By the manufacturing process, the internal-thread heat exchange pipe which is excellent can be produced.
Description
Technical field
The present invention relates to a kind of Internal Screw Thread Heat Exchange Pipes, relate in particular to a kind of Internal Screw Thread Heat Exchange Pipes and manufacturing process thereof.
Background technology
For the requirement to the power saving of air-conditioner series products, energy-conservation, lightweight, miniaturization and Montreal Convention, need to reduce fluorine Lyons and harmful fluorine-containing thing consumption, the change of working medium will cause air-conditioner heat exchanger effectiveness to decline, for this reason, one of countermeasure of taking is exactly to use air-conditioning pipe---the riffled tube of higher heat exchange performance.This riffled tube, heat transfer area increases, and can effectively promote turbulent flow, improves heat exchanger effectiveness.According to data introduction: this kind of internal thread pipe realized 5 times to the high heat exchanger effectiveness of smooth tubes, therefore, becomes various countries and unexpectedly develops mutually and the new material of greatly developing.In general, the mode of production of this type of riffled tube has extruding and two kinds of high-frequency weldings, and ratio-frequency welded tube is owing to there being following advantage: (1) heat exchanger effectiveness is higher by 50% than extruded tube under the same conditions.(2) without oil processing, before assembling, without cleaning, environmental pollution is little.(3) geometry is versatile and flexible, is easy to processing, can meet multiple requirement, and wall thickness is little simultaneously.(4) production efficiency is high, can reach 180m/min, and pressing drawing pipe is generally 80m/min, and is that people accept extensively.
An existing utility model patent, its application number is 201220168016.X, discloses a kind of heat exchange internal thread aluminium pipe, aluminum pipe inner surface is covered with screw thread, the tooth profile parameter of described screw thread is: helical angle is 0～30 °, and addendum angle is 30～60 °, and tooth depth is 0.08～0.25mm.This utility model adopts metallic aluminium to make, and greatly reduces the manufacturing cost of air-condition heat exchanger, reduces metal consumption, and use aluminium fin outside aluminum pipe, and between aluminium and aluminium, there is not potential difference, can there is not electrochemical corrosion, guarantee the heat exchange efficiency of air-conditioning, reached green, energy-conservation effect.But this utility model is simple in structure, insufficient strength, the turbulent poor effect of mobile refrigerant in heat-exchange tube, rate of heat exchange is lower.
An existing application for a patent for invention, its application number is 201210134833.8, this disclosure of the invention a kind of production method of heat exchange internal thread aluminium pipe, comprise that drawing, annealing, rotary press modelling, sizing, closing quotation, minute travelling expenses are around, the oil removing that homogenizes, packing warehouse-in treatment process.This inventive method is first to draw, anneal, then rotary press modelling, is inconvenient to like this process, and has limited the production method of lines and the pattern of lines in heat-exchange tube simultaneously.
Heat-exchange tube is divided into pipe and elliptical tube.Oval tube heat exchanger has the following advantages: the heat exchange area that 1, oval tube heat exchanger need be less than pipe heat exchanger and less fan energy consumption; 2,, under identical face velocity, elliptical finned tube is more much larger than the air side coefficient of heat transfer of round finned tube; When 3, the coefficient of heat transfer is identical, the pressure drop of elliptical finned tube is less than pipe heat exchanger.Although oval tube heat exchanger has above advantage at present, above-mentioned " a kind of production method of heat exchange internal thread aluminium pipe " is also not suitable for producing oval tube heat exchanger.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Internal Screw Thread Heat Exchange Pipes and manufacturing process thereof, solves the deficiencies in the prior art.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of Internal Screw Thread Heat Exchange Pipes, and it comprises metal tube, on the inwall of described metal tube and along the axis direction of described metal tube, is provided with welded seam; On the inwall of described metal tube and in the both sides of described welded seam, be respectively equipped with muscle, described muscle comprises the first muscle and the second muscle, and described the first muscle is arranged on a side of described welded seam, and described the second muscle is arranged on the opposite side of described welded seam; Described the first muscle and the second muscle all parallel with described welded seam; On the inwall of described metal tube and between described the first muscle and the second muscle, be provided with spiral region, described spiral region is provided with many spiral helicine helical tooths; Described at least one, one end of helical tooth is connected with described the first muscle, and the other end is connected with described the second muscle.
The invention has the beneficial effects as follows: in the present invention, owing to having done, prevent that the edges at two ends of metal belting from producing the measure of wave transformation, can further be improved than former product the height dimension of helical tooth.In this case, the discharge opeing performance that can improve the tooth tip of helical tooth flows liquid coolant and produces eddy current effect in pipe, and the effect of turbulent flow generation, has the not available high heat exchange performance of common profile of tooth riffled tube in the past.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of production method of Internal Screw Thread Heat Exchange Pipes, comprises following treatment process, step 1: uncoiler launches, and described uncoiler launches to be used for the metal belting continuous spreading of rolling; Step 2: profile of tooth rolling forming, described profile of tooth rolling forming rolls out helical tooth, muscle for a side surface of described metal belting that step 1 is launched; Step 3: multiple roll rolls into pipe, described multiple roll rolls into pipe and rolls into metal circular tube for the described metal belting that step 2 was rolled; Step 4: guiding high frequency extruding welding, described high-frequency welding is for welded together by the gap of described metal circular tube.
The invention has the beneficial effects as follows: the manufacture method of the Internal Screw Thread Heat Exchange Pipes that the present invention is relevant, not only can obtain above said good Internal Screw Thread Heat Exchange Pipes, internal thread profile of tooth is optimized after process and remould, compare with the edge of the original profile of tooth of metal belting, when guiding welding extruding, because the glacing flatness of the adjacent both sides of the edge of weld seam gets a promotion, the wave phenomenon at edge is inhibited, and stability and the reliability of welding are also improved; And the thickness of the adjacent both sides of the edge of weld seam can become large relatively, the inside bend of pipe is more difficult.Also the reliability that can say from the side Internal Screw Thread Heat Exchange Pipes gets a promotion.Manufacture method for the relevant Internal Screw Thread Heat Exchange Pipes of the present invention, not only can solve the technical problem of the formation of groove in circular heat exchanging tube, can conveniently produce the oval heat-exchange tube with interior groove simultaneously, because oval heat-exchange tube has better heat-exchange capacity, existing patent 201210134833.8 can not be produced " with the oval heat-exchange tube of interior groove " simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of sectional view of Internal Screw Thread Heat Exchange Pipes;
Fig. 2 is the partial enlarged view of Fig. 1;
Fig. 3 is a kind of expansion view of Internal Screw Thread Heat Exchange Pipes;
Fig. 4 is the schematic diagram of processing technology of the present invention;
Fig. 5 is the schematic diagram at metal belting edge in the present invention;
Fig. 6 is the structural representation of a kind of profile of tooth shaped device in the present invention;
Fig. 7 is a kind of partial sectional view of profile of tooth shaped device;
Fig. 8 is the expanded view of heat-exchange tube in the second embodiment;
Fig. 9 is the expanded view of heat-exchange tube in the 3rd embodiment;
Figure 10 is a kind of continous way roll-type forming machine in the present invention;
Figure 11 is the partial sectional view of second horizontal roller in the present invention;
Figure 12 is the partial sectional view of the 3rd horizontal roller in the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
The first embodiment:
The present invention relates to a kind of female heat-exchange tube of being with:
As shown in Figure 1, Figure 3, be a kind of Internal Screw Thread Heat Exchange Pipes sectional view, it comprises metal tube 001, on the inwall of described metal tube 001 and along the axis direction of described metal tube 001, is provided with welded seam 002; On the inwall of described metal tube 001 and in the both sides of described welded seam 002, be respectively equipped with muscle, be that described muscle comprises the first muscle 003 and the second muscle 004, described the first muscle 003 is arranged on a side of described welded seam 002, and described the second muscle 004 is arranged on the opposite side of described welded seam 002; Described the first muscle 003 and the second muscle 004 all parallel with described welded seam 002.On the inwall of described metal tube 001 and between described the first muscle 003 and the second muscle 004 (for a pipe, between described the first muscle 003 and the second muscle 004, there are two regions, but this local region that there is no described welded seam 002 that refers to) be provided with spiral region, described spiral region is provided with many spiral helicine helical tooths 005.Helical angle 08 span of described helical tooth 005 is 10 to 35 degree, preferably 15 degree, 20 degree, 25 degree, 30 degree.
As shown in Figure 2 and Figure 3, between described welded seam 002 and described the first muscle 003, be provided with the first groove 007, between described welded seam 002 and described the second muscle 004, be provided with the second groove 008; Between two adjacent described helical tooths 005, be provided with spiral grooves 006, described spiral grooves 006 is positioned at described spiral region.This is because riffled tube surface has groove (spiral grooves 006), it has increased heat exchange area than the light pipe of same specification, improved the pyroconductivity of refrigerant side, the disturbance of gas-liquid interface is increased greatly, pipe bottom has obtained effective stirring with the refrigerant liquid at pipe top, simultaneously because surface tension makes the reasons such as thinning of liquid film even destroys, heat transfer coefficient is increased, improve heat exchange condition, effectively improved heat exchanger effectiveness.
As shown in Figure 1, described spiral region comprises first area 02, second area 03, the 3rd area 04 (in the present invention: described first area 02 is near described the first muscle 003, described the 3rd area 04, near described the second muscle 004, is that a name is as limiting here.Near described the second muscle 004, can be also described first area 02, can be also described the 3rd area 04 near described the first muscle 003).Described second area 03 is arranged between described first area 02 and described the 3rd area 04.
As shown in Figure 3, for the expansion view that a kind of Internal Screw Thread Heat Exchange Pipes of the present invention is cut off from second area 03, the two ends of helical tooth 005 described at least one (in the present invention: one end of described helical tooth 005 is near described the first muscle 003, and be connected with described the first muscle 003; The other end of described helical tooth 005 is near described the second muscle 004, and be connected with described the second muscle 004) be connected with described muscle respectively, can conveniently process like this, in metal belting is rolled into tooth technique, can suppress better the trend that metal belting edge produces wave transformation.The present invention is preferred: one end of every described helical tooth 005 is connected with described the first muscle 003, and the other end is connected with described the second muscle 004.
As shown in Figure 2, the distance 01 between the center line of described the first muscle 003 and the center line of the second muscle 004 be described metal tube 001 the all-round length of inner peripheral surface 2% to 5%; Preferably 3% to 4%.If in 2% to 5% scope, not only can effectively prevent that metal belting from adding man-hour, its edge generation wave transformation, and also described muscle also can get a promotion to weld zone stiffening effect around.
The amount that described the first muscle 003 and the second muscle 004 protrude with respect to the inner surface of described metal tube 001 is set as the 10% to 80% more suitable of amount that second area 03 internal screw tooth 005 protrudes with respect to the inner surface of described metal tube 001; Preferably 30% to 50%.Within the scope of this, described muscle is when expander operation (flaring test on tube of metal), and the possibility that collides the swollen head of expander reduces, and the stiffening effect of described muscle also can be given full play to.
Flaring test on tube of metal:
1, specification requirement, flaring test should meet following table and require:
| Materials behavior | Enlarging rate (%) | Drift tapering | Effect |
| M(OL) | 40 | 60 | Should not produce macroscopic crackle |
2, test method
Flaring test reference standard GB/T242 tests, concrete flaring test method: cut off one section of copper pipe with pipe cutter, with silicon carbide paper, grind off mouth of pipe burr, after use enlarging clamp clamps copper pipe, select 60 ° of coneheads to be contained in fixture, evenly rotate conehead copper pipe is carried out to flaring test until naked eyes visible crack appears in the mouth of pipe, with survey tool line up external diameter, measure afterwards, the enlarging rate of calculating should be greater than the requirement in table.(note: avoid making copper pipe to produce linear damage while cutting sample.)
The circumferential width that the circumferential width of described first area 02 adds the above second area 03 be described metal tube 001 the all-round length of inner peripheral surface 20% to 50%; Preferably 30% to 40%.If in 20% to 50% scope, can prevent from described welded seam 002, around to start to chap at first in enlarge test.Preferred: the circumferential width of described first area 02 equates with the circumferential width of described second area 03.
As shown in Figure 1, Figure 2, Figure 3 shows, the height 05 of the described helical tooth 005 in described second area 03 remains unchanged.The height 06 of the described helical tooth 005 in described first area 02 all along with and described the first muscle 003 between distance minimizing and reduce; The height 07 of the described helical tooth 005 in described the 3rd area 04 all along with and described the second muscle 004 between distance minimizing and reduce.The present invention is preferred: the height of the junction of described helical tooth 005 and described the first muscle 003 equals the height of described the first muscle 003, the height of the junction of described helical tooth 005 and the second muscle 004 equals the height of described the second muscle 004, for convenient processing, the present invention preferably height of described the first muscle 003 equates with the height of the second muscle 004.
The wall thickness of the described metal tube 001 in described spiral region along with and described muscle between distance minimizing and thicken.Preferred: the wall thickness of the described metal tube 001 in described first area 02 along with and described the first muscle 003 between distance minimizing and thicken; The wall thickness of the described metal tube 001 in described the 3rd area 04 along with and described the second muscle 004 between distance minimizing and thicken; And the wall thickness of the described metal tube 001 in described second area 03 remains unchanged.
At the wall thickness of the described metal tube 001 at described the first groove 007 and the second groove 008 place, be not less than the thickest (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in described first area 02 and the interior described spiral grooves of the 3rd area 04 006 place) of the described metal tube 001 in described first area 02 and the 3rd area 04.The present invention is preferred: at the wall thickness of the described metal tube 001 at described the first groove 007 and the second groove 008 place, be greater than the thickest (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in described first area 02 and the interior described spiral grooves of the 3rd area 04 006 place) of the described metal tube 001 in described first area 02 and the 3rd area 04.
The wall thickness of the described metal tube 001 in described second area 03 (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in the interior described spiral grooves of described second area 03 006 place) is not more than the minimum wall thickness (MINI W.) (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in described first area 02 and the interior described spiral grooves of the 3rd area 04 006 place) of the described metal tube 001 in described first area 02 and the 3rd area 04.The present invention is preferred: the wall thickness of the described metal tube 001 in described second area 03 (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in the interior described spiral grooves of described second area 03 006 place) equals the minimum wall thickness (MINI W.) (the wall thickness here refers to: the wall thickness of metal tube 001 is stated in described first area 02 and the interior described spiral grooves of the 3rd area 04 006 place) of the described metal tube 001 in described first area 02 and the 3rd area 04.
The top ends of described welded seam 002 is slightly less than the tooth top end of the described helical tooth 005 in described second area 03 to the thickness of the outer wall of described metal tube 001 to the thickness of the outer wall of described metal tube 001.If the top ends of described welded seam 002 is than more close described metal tube 001 center, the tooth top end of the described helical tooth 005 in described second area 03, so the periphery of described metal tube 001 is being fixed, when its inner periphery is carried out to expander operation, described welded seam 002 place likely interferes with the swollen head of expander.In addition, if with respect to the tooth top end of the described helical tooth 005 in described second area 03, the top ends position of described welded seam 002 is too low, so when carrying out above-mentioned expander operation, may cave in the position of the excircle that described welded seam 002 is corresponding, the cylindricity of described metal tube 001 will reduce, and the described helical tooth 005 transmitting for heat and the fin on it will be fixed unstable.
The present invention also relates to the manufacturing process of above-mentioned heat-exchange tube:
A production method for Internal Screw Thread Heat Exchange Pipes, comprises following treatment process, step 1: uncoiler launches, and described uncoiler launches to be used for the metal belting continuous spreading of rolling; Step 2: profile of tooth rolling forming, described profile of tooth rolling forming rolls out helical tooth, muscle for a side surface of described metal belting that step 1 is launched; Step 3: multiple roll rolls into pipe, described multiple roll rolls into pipe and rolls into metal circular tube for the described metal belting that step 2 was rolled, now on the periphery of metal circular tube, there is gap one, this gap is that two sides of metal belting volume form when reeling, and with a side of tooth, forms the inner surface of described metal circular tube; Step 4: guiding high frequency extruding welding, described guiding high frequency extruding welding is for welded together by the gap of described metal circular tube, finally by packing after product annealing.
Preferred: this production method also comprises step 5 after step 4: scraping scar and go overlap, is exactly that the overlap of extruding is rejected with scraper by after metal circular tube welding extruding;
Preferred: after this production method step 5, also to comprise step 6: precision truing, welding is scraped to the appearance and size precision truing of the pipe after scar to the appearance and size of product requirement;
Preferred: after this production method step 6, also to comprise step 7: rapidly to shear, resultant metal pipe is required to clip to certain supply of material length to user according to user.
As shown in Figure 6, Figure 7, in step 2, relate to a kind of profile of tooth shaped device:
A kind of profile of tooth shaped device is used for metal belting profile of tooth rolling forming; This device comprises framework 201, profile of tooth molding roller 202, level and smooth roll 203, and described profile of tooth molding roller 202 is rotationally connected by drive shaft and described framework 201, and described level and smooth roll 203 is rotationally connected by drive shaft and described framework 201.Described profile of tooth molding roller 202 is arranged at the top of described level and smooth roll 203, and the plane and the described metal belting 101 that between the central shaft of described profile of tooth molding roller 202 and described level and smooth roll 203 central shafts, are connected are perpendicular.Adopting in the present invention described profile of tooth molding roller 202 to be arranged at the top of described level and smooth roll 203, is that the tooth of projection while facilitating follow-up roll-forming forms internal thread welded tube at the inner surface of pipe like this; Described profile of tooth molding roller 202 also can be arranged at the below of described level and smooth roll 203 in fact, is not limited to above-mentioned set-up mode.
Described profile of tooth molding roller 202 comprises profile of tooth molding roller body 204 and is arranged at the side roll 205 of described profile of tooth molding roller body 204 both sides; The periphery of described profile of tooth molding roller body 204 is provided with many spiral-shaped helicla flutes 206, between described helicla flute 206, is provided with boss 207; The two ends of described profile of tooth molding roller body 204, be provided with the ring-shaped groove 208 (for whole profile of tooth molding roller 202, ring-shaped groove 208 is symmetricly set in the two ends of profile of tooth molding roller 202) around outer circumference surface with the boudary portion of described side roll 205.As shown in Figure 1, the effect of ring-shaped groove 208 is: by profile of tooth molding roller 202 on metal belting along the both sides of the edge of metal belting and to have the position of certain distance to roll out the first muscle 003 of projection and the second muscle 004, the first muscle 003 and the second muscle 004 be to form in the total length of metal belting 101.In this implementation process, the state of the cross section of ring-shaped groove can be that level and smooth circular shape can be also triangle.
The outer circumference surface at the middle part of described profile of tooth molding roller body 204 is the positive face of cylinder, therefore, can guarantee that the wall thickness of the described metal tube 001 in described second area 03 remains unchanged.Described profile of tooth molding roller body 204 is taper seat and is the taper seat of the reduced diameter in roll 205 directions of described side at the outer circumference surface of the two side portions of axis direction.Therefore, the thickness of the metal belting 101 at spiral grooves 006 two ends is set to towards the direction of the first muscle 003 and the second muscle 004 and increases progressively: be also the described metal tube 001 in described first area 02 wall thickness along with and described the first muscle 003 between distance minimizing and thicken; The wall thickness of the described metal tube 001 in described the 3rd area 04 along with and described the second muscle 004 between distance minimizing and thicken.
The degree of depth of described helicla flute 206 reduces gradually towards the two ends of described profile of tooth molding roller body 204, in addition, carries out chamfering whether can for the boss 207 of profile of tooth molding roller body 204 and the edge of helicla flute 206.Therefore,, with the height of the helical tooth 005 on the metal belting 101 of roll roll forming, along with approaching the first muscle 003 and second muscle 004 of projection, just presented the trend reducing.
The outer circumference surface of described molding roller is circular cone profile, and the outer circumference surface of described molding roller dwindles towards outside external diameter gradually along axis direction.
In step 3, relate to a kind of continous way roll-type forming machine:
As shown in Figure 10, Figure 11, Figure 12, a kind of continous way roll-type forming machine, it comprises at least two horizontal roller, and (this example is with four horizontal roller, first horizontal roller 501, second horizontal roller 502, the 3rd horizontal roller 503, the 4th horizontal roller 504, the 5th horizontal roller 505), first horizontal roller 501 centers to the distance at last horizontal roller (namely the 5th horizontal roller 505) center is called asynchronous region length L.The principle of determining asynchronous region length L is: must guarantee that metal belting 101 edges do not produce plastic deformation in forming process, to prevent the generation of the defects such as edge bulge and wave.Best asynchronous region length L is asynchronous region length L minimum under the prerequisite that guarantees this principle.General asynchronous region length L is maximum 50 times of left and right of rising height.
For the needed asynchronous region length L of shape steel production unit, relevant with the complexity of the total deformation deformed shape of clod wash shape material.Still there is no at present general asynchronous region length L computational methods.It is all the product of theory and practice experience combination.
First horizontal roller 501 is to last horizontal roller (namely the 5th horizontal roller 505), and the line of the minimum point of each lower forming roller pass is called moulding bottom line.The distribution of moulding bottom line roughly has 4 kinds: a, the method for going up a hill; B, bottom line Using Horizontal Bridgman Method; C, down-hill method; D, edge line Using Horizontal Bridgman Method; E, comprehensive shaping method.
A, the method for going up a hill; Bottom line rises gradually in forming process.
B, bottom line Using Horizontal Bridgman Method; Bottom line is a horizontal line in forming process.
C, down-hill method; Bottom line declines gradually in forming process.
D, edge line Using Horizontal Bridgman Method; Edge line (connection of each marginal point) maintenance level in forming process.
E, comprehensive shaping are sent out; Two or three method in conjunction with the above-mentioned method of forming is carried out moulding.
The present invention adopts comprehensive shaping method, the integrated application of method, bottom line Using Horizontal Bridgman Method and down-hill method because go up a hill, object is to guarantee that metal belting is in shaping and deformation process, the stability that guarantees metal belting edge has also farthest reduced inhomogeneities extending longitudinally on metal belting cross section simultaneously.
Determining of forming frame spacing will be considered the plastic deformation at metal belting edge, the structural design of frame, and many-sided requirements such as installation of guider.In same unit, frame spacing can be identical, also can be different.For continous way ratio-frequency welded tube unit, its horizontal roller frame spacing a can be determined by produced maximum caliber Dmax:
a＝kDmax＝(5.7～10)Dmax
Thereby horizontal roller frame quantity n is:
n＝L/a+1
As L=(40～57) Dmax, during a=(5.7～10) Dmax, can obtain n=7～10.
When adopting ratio-frequency welded tube unit to produce cold-forming shapes, the maximum deflection angle that every forming table shaping apparatus allows is between 10 °～30 °, mean value can be thought and approximates 20 °, thereby the monolateral angle of bend summation of the complex product that can produce by it of the horizontal roller frame quantity of needed shaping machine set calculates, for:
n＝0.05ΣΔαi+1。
The beneficial effect of rolling forming:
1, be suitable for the production in enormous quantities of the equal section product of endless, because metal belting is that roll is successively sent to, so just can and then the serialization of kinds of processes be produced with other processing unit (plant) interlocks such as the shaping of punching, compound section, high-frequency welding, flying shear blanking, become a reality.
2, due to the punching of long size product, crookedly need large-scale equipment, thereby roll extrusion is economical beyond doubt.But in the situation that the long many kinds small batch of product size produces, but punching, bending are economical.
While 3, using drawing equipment to be shaped, the defect such as easily produce warpage, torsion, wall unevenness is even, surface smoothness is bad, but rolling forming just can be avoided the generation of these disadvantages.
During 4, due to roll forming, in thickness of slab direction, there is no drafts, compare with bundle machine, rolling forming is lower and simple in structure to the requirement of strength of equipment.
5, less through the deflection of each roll pass, therefore processed surface smoothness is better, for painting matemal, also can realize well processed.
As shown in Figure 4, the manufacturing process of heat-exchange tube is further described:
First the entire volume metal belting 101 of certain width to be pulled out successively from uncoiler 102, the metal belting 101 being drawn out is by first group of metal belting storage tensioner 103, after the rolling through a kind of profile of tooth shaped device 104, as shown in Figure 1, Figure 2, Figure 3 shows, the first muscle 003 of projection and the second muscle 004, one or more groups helical tooth 005 and spiral grooves 006 have at an angle mutually been formed.
The material of metal belting 101 can be that copper and copper alloy can be also the metal materials such as aluminium and aluminium alloy.
By the metal belting 101 through tooth Profile Machining, as shown in Figure 4; Metal belting 101 is by second group of metal belting storage tensioner 105, and more than minimum four pairs shaping round tube are rolled into forming roll 106, and flat metal belting 101 is shaped to circular tube shaped gradually; By rotary ceramic directive wheel or ceramic gib block 107, two edges to be welded are controlled in the certain symmetrical scope being as the criterion with axis again; Afterwards by welding induction coil 108 heating edges at two ends position to be welded rapidly, then push by 109 pairs of edges at two ends of a pair of welding compression roller, make the edges at two ends part that heated combined, be welded as a whole.Owing to overflowing the weld seam slag of the formed projection of material of the thawing of heat-exchange tube outer circumference surface, can cut this welding slag with the dreg scraper knife tool in slag-scraper 110.
The heat-exchange tube that machines away weld seam slag is forced cooling by cooling bath 111, then through three pairs or three pairs of above precision truing rolls 112 of arranging, external diameter is shaped into the desired outside dimension of product gradually.Afterwards with the qualified heat-exchange tube behind the coiler 113 coiling whole footpaths of above-mentioned welding.According to the structure of device, form and also can be deformed into better device.
As shown in Figure 5, the manufacture method of general Internal Screw Thread Heat Exchange Pipes, the position, both sides of the edge 114 of metal belting 101 is not to form linearity in hobbing process, but finds to have become wavy.So when welding post welds metal belting 101 position, two edges 114 docking, will there is gap, likely cause the unstability of weld defect and welding quality.If the edge 114 of metal belting 101 has significantly become wavy as in Fig. 5, in order to improve welding quality, just the part at the edge of metal belting 101 114 must be processed into linearity.
According to research, learn, along with the increase of the tooth depth of the helical tooth 005 in Internal Screw Thread Heat Exchange Pipes, and helical tooth 005 section configuration narrowing down in facewidth direction, can improve the heat exchange property of heat-exchange tube; And along with the increase of aforementioned tooth depth in profile of tooth forming process and narrowing down of the facewidth, the wave phenomenon at the edge 114 of metal belting 101 will become more outstanding.Therefore the present invention is in profile of tooth forming process, and the edge 114 of metal belting 101 occurs that the situation of undaform done detailed deep research.In forcing the process of gear rolling formation type, the part that is about to form spiral grooves 006 is larger than the rolling rate of part material that is about to form helical tooth 005, will produce like this flowing of material from the end of spiral grooves 006 to the edge 114 of anodontia metal belting 101.
The present invention is based on aforesaid defect and produce present situation, prevent that the edge 114 of metal belting 101 from occurring corrugated phenomenon in the process of profile of tooth pressure roll forming, and then improve the reliability of riffled tube and the manufacture method that quality is studied.
For addressing the aforementioned drawbacks, in the corresponding Internal Screw Thread Heat Exchange Pipes of the present invention, possessed along a root bead welding seam on this metal tube axis direction, and at the protruding muscle parallel with weld seam respectively of the adjacent distance in welded seam left and right, also have between these protruding muscle but do not comprise many protruding spiral helicine helical tooths 005 in welded seam region.Aforesaid helical tooth 005 has certain crossing angle with the axis direction of aforesaid metal tube, and the feature that is connected with muscle of the end of helical tooth 005.With the protruding helical tooth 005 of metal belting 101 processing and by between helical tooth 005 during formed spiral grooves 006, even if generating material is from the end of spiral grooves 006 to the tooth position dumping tower tray without protruding, also can lean against spiral grooves 006 and without the liquidity preference that the first protruding muscle 003 forming between protruding tooth position and the second muscle 004 are tackled material, prevent that the edges at two ends of metal belting from forming wave-like.Therefore, owing to there is the defect of the welding position that wave-like produces, can prevent, also can improve quality and the reliability of Internal Screw Thread Heat Exchange Pipes.
In addition, according to this Internal Screw Thread Heat Exchange Pipes, due to the metal recrystallization in when welding, near the metallographic structure of weld metal zone (refer to welded seam 002) is more smaller than mother metal, this after high-temperature soldering rapidly water-cooled cause.This has determined that weld metal zone is larger than the hardness of mother metal, so while doing explosion bulge test, the position of first destroying is mother metal rather than weld seam.But near the both sides of welded seam 002, due to have respectively a first protruding muscle 003 hardening by extrusion process and the second muscle 004 can make up softening welded seam 002 near, also there is the welded seam of preventing 002 near relative intensity low.
And, in Internal Screw Thread Heat Exchange Pipes, because the pipe thickness in spiral grooves 006 is towards welded seam 002 thickening gradually, even heat-exchange tube is carried out to expander processing, there is no yet difficult be full of cracks of the part of helical tooth 005 and the border of spiral grooves 006, can improve the reliability of heat-exchange tube.
The present invention is the heat-exchange tube at 3～35mm for the manufacture of general external diameter, and the thickness of the metal belting before profile of tooth moulding is preferably in 0.20～3.5mm and the degree of depth (the namely tooth depth of helical tooth 005) of the spiral grooves 006 that forms in metal belting preferably within the scope of (20～65) % of metal belting thickness.Particularly in the present invention, owing to having done, prevent that the edges at two ends of metal belting from producing the measure of wave transformation, can further be improved than former product the height dimension of helical tooth 005.In this case, the discharge opeing performance that can improve the tooth tip of helical tooth 005 flows liquid coolant and produces eddy current effect in pipe, and the effect of turbulent flow generation, has the not available high heat exchange performance of common profile of tooth riffled tube in the past.
The second embodiment:
This example is mainly aimed at another kind of Novel hot exchanging tube, and it is different that this Novel hot exchanging tube and the difference of heat-exchange tube in the first embodiment are embodied in inner lines.Under regard to Novel hot exchanging tube processing method illustrate.
In the first embodiment as above, only carried out the profile of tooth roll forming moulding in a stage according to a kind of profile of tooth shaped device, the tooth technique that is rolled into of the present embodiment and the first embodiment is had any different, and other all adopts the process in the first embodiment.The present embodiment is used two or more profile of tooth shaped devices to carry out secondary or profile of tooth rolling forming moulding more than secondary, just can on the basis of primary profile of tooth moulding, process with the profile of tooth of intersecting of intersecting for the first time.
As shown in Figure 8: the inner peripheral surface expanded view of the Novel hot exchanging tube obtaining according to the technique of the second embodiment.This heat-exchange tube has related to established whole protruding tooth 301 (with respect to the helical tooth 005 in the first embodiment), between the tooth 301 of projection, be provided with inter-tooth slots 302 (with respect to the spiral grooves 006 in the first embodiment), be staggered to form the groove 303 of cross section V word shape with protruding tooth 301; When protruding tooth segmentation being shortened by these grooves 303, occurred that again new feature had both formed boss 304 in the both sides of groove 303.If form such boss 304, can form groove 303 at the downside of these boss 304, this narrow groove 303 facilitation effect of refrigerant boiling (turbulent flow) that just can be improved, also makes the efficiency of seething with excitement be improved so.Also obtained the effect same with the first example simultaneously.
The 3rd embodiment:
This example is mainly aimed at another kind of Novel hot exchanging tube, and it is different that this Novel hot exchanging tube and the difference of heat-exchange tube in the first embodiment are embodied in inner lines.Under regard to Novel hot exchanging tube processing method illustrate.
In the first embodiment, although the helical tooth 005 of projection has formed single helical form, and the spiral form that single helical form protruding tooth in addition forms in the present invention also has a lot.For example, as shown in Figure 9: the 3rd form of implementing is the W word shape helical tooth 402 that is regarded as plane, here the W word shape of saying does not refer to cross section, and refers to when heat-exchange tube launches the state that bossing (with respect to helical tooth 005 in the first embodiment) presents; W word shape helical tooth 402 is arranged in W word shape local 401 (W word shape local 401 is with respect to spiral region in the first embodiment), is provided with W word shape groove 403 between W word shape helical tooth 402.W word shape helical tooth 402 is exactly to line up formed by single helical tooth (referring to the helical tooth 005 in the first embodiment) grouping.The W word shape forming according to single like this helical tooth is arranged, and the action of turbulent flow of refrigerant mobile in heat-exchange tube is strengthened, and rate of heat exchange can access further lifting.Certainly, the formed shape of tooth of projection is not limited to W word shape, also likely becomes other various forms of shapes such as VVV word, S word.
In addition each above-mentioned example not only forms projection (005 at the inner surface of heat-exchange tube; 301; 402) and groove (006; 302; 403); The present invention also can form at the outer surface of heat-exchange tube projection and groove.In addition in the present invention, longer tooth is divided into shorter protruding tooth, can also can implements many formations according to plover shape or zigzag shape.No matter be that occasion can obtain above-mentioned said basic effect.
Next illustrative example proves effect of the present invention.
Heat-exchange tube of the present invention and common heat-exchange tube (comparative example) are compared, and each manufactures 15 meters, carries out expander processing, the amplification degree calibrating between chapping.
The size of various heat-exchange tubes is as follows:
The identical data of the present invention and comparative example: the external diameter of heat-exchange tube: 9.52mm; Material: high phosphorized copper; Original metal band material thickness: 0.45mm; The tooth two sides angle of projection: 50 degree; The bottom width of spiral grooves: 0.24mm.
Data of the present invention: the peak of helical tooth: 0.22mm; The minimum of helical tooth: 0.07mm; Wall thickness in second area inter-spiral groove: 0.29mm; Thickest in first area and the 3rd region inter-spiral groove: 0.34mm; Wall thickness in the first groove and the first internal channel: 0.36mm; The total height (muscle pushes up outer wall thickness) of the muscle of projection: 0.39mm; The total height at welded seam place (weld seam top is to outer wall thickness): 0.48mm; The distance 0.98mm of the centreline space of the first muscle and the second muscle.
The data of comparative example: the height of helical tooth: 0.18mm; The total height of welded seam: 0.46mm.
Other expander condition is as follows: fixed point angle 60 degree of expanding tool.
Result shows, in comparative example, and while there is be full of cracks in the heat-exchange tube of internal thread groove, 1.30 times of the rate of spread average out to of bore, the Internal Screw Thread Heat Exchange Pipes in example is 1.45 times.When being used as expander processing after example is confirmed, be not easy to chap.
The effect of invention: as mentioned above, according to the Internal Screw Thread Heat Exchange Pipes relevant with the present invention, because accomplish the wall thickness of metal tube in an adjacent region of the welded seam left and right sides, direction towards weld seam increases gradually, in heat-exchange tube expander, even if the ductility of the welding position of heavy wall is not fine, the local stress that is positioned near the spiral grooves in welding position is difficult to concentrate, and where can prevent the generation of be full of cracks.Therefore, after expander is processed, yield rate is promoted, and the reliability of heat-exchange tube is improved.
On the other hand, according to the manufacture method of the Internal Screw Thread Heat Exchange Pipes relevant with the present invention, not only can obtain above said good Internal Screw Thread Heat Exchange Pipes, internal thread profile of tooth is optimized after process and remould, compare with the edge of the original profile of tooth of metal belting, when welding extruding, because the adjacent both sides of the edge of weld seam glacing flatness gets a promotion, the wave phenomenon at edge is inhibited, and stability and the reliability of welding are also improved; And the thickness of the adjacent both sides of the edge of weld seam can become large relatively, the inside bend of pipe is more difficult.Also the reliability that can say from the side Internal Screw Thread Heat Exchange Pipes gets a promotion.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an Internal Screw Thread Heat Exchange Pipes, is characterized in that: comprise metal tube, on the inwall of described metal tube and along the axis direction of described metal tube, be provided with welded seam; On the inwall of described metal tube and in the both sides of described welded seam, be respectively equipped with muscle, described muscle comprises the first muscle and the second muscle, and described the first muscle is arranged on a side of described welded seam, and described the second muscle is arranged on the opposite side of described welded seam; Described the first muscle and the second muscle all parallel with described welded seam; On the inwall of described metal tube and between described the first muscle and the second muscle, be provided with spiral region, described spiral region is provided with many spiral helicine helical tooths; Described at least one, one end of helical tooth is connected with described the first muscle, and the other end is connected with described the second muscle.
2. a kind of Internal Screw Thread Heat Exchange Pipes according to claim 1, is characterized in that: described spiral region comprises first area, second area, the 3rd region; Described second area is arranged between described first area and described the 3rd region; The height of the described helical tooth in described first area all along with and described the first muscle between distance minimizing and reduce; The height of the described helical tooth in described the 3rd region all along with and described the second muscle between distance minimizing and reduce; The height of the described helical tooth in described second area remains unchanged.
3. a kind of Internal Screw Thread Heat Exchange Pipes according to claim 2, is characterized in that: the wall thickness of the described metal tube in described spiral region along with and described muscle between distance minimizing and thicken.
4. a kind of Internal Screw Thread Heat Exchange Pipes according to claim 3, is characterized in that: between described welded seam and described the first muscle, be provided with the first groove, between described welded seam and described the second muscle, be provided with the second groove; Between two adjacent described helical tooths, be provided with spiral grooves, described spiral grooves is positioned at described spiral region; At the wall thickness of the described metal tube at described the first groove and the second groove place, be not less than the thickest of the described metal tube in described first area and the 3rd region.
5. a kind of Internal Screw Thread Heat Exchange Pipes according to claim 4, is characterized in that: the amount that described the first muscle and the second muscle protrude with respect to the inner surface of described metal tube is set as the 10% to 80% more suitable of amount that second area internal screw tooth protrudes with respect to the inner surface of described metal tube.
6. a production method for Internal Screw Thread Heat Exchange Pipes, is characterized in that: comprise following treatment process,
Step 1: uncoiling launches, by the metal belting continuous spreading of rolling;
Step 2: profile of tooth rolling forming, rolls out helical tooth, muscle by a side surface of the described metal belting launching in step 1;
Step 3: multiple roll rolls into pipe, described multiple roll rolls into pipe and rolls into metal pipe to be welded for the described metal belting that step 2 was rolled;
Step 4: high frequency guiding extruding welding, described metal pipe to be welded is formed to welding angle, welded together by extruding gap behind high-frequency heating two edges.
7. a kind of production method of Internal Screw Thread Heat Exchange Pipes according to claim 6, is characterized in that: also comprise step 5: scrape scar and go overlap, by after the welding of metal circular tube described in described step 4 extruding, the overlap of extruding is rejected with scraper.
8. a kind of production method of Internal Screw Thread Heat Exchange Pipes according to claim 7, is characterized in that: also comprise step 6: precision truing, will in described step 5, scrape the appearance and size of the appearance and size precision truing of the described metal circular tube after scar to product requirement.
9. according to the production method of the arbitrary described a kind of Internal Screw Thread Heat Exchange Pipes of claim 6 to 8, it is characterized in that: in described step 2, comprise for by a kind of profile of tooth shaped device of metal belting profile of tooth rolling forming; This device comprises framework, profile of tooth molding roller, level and smooth roll, and described profile of tooth molding roller is rotationally connected by drive shaft and described framework, and described level and smooth roll is rotationally connected by drive shaft and described framework; Described profile of tooth molding roller is arranged at the top of described level and smooth roll, and the plane and the described metal belting that between the central shaft of described profile of tooth molding roller and described level and smooth roll central shaft, are connected are perpendicular.
10. a kind of production method of Internal Screw Thread Heat Exchange Pipes according to claim 9, is characterized in that: described profile of tooth molding roller comprises profile of tooth molding roller body and is arranged at the side roll of described profile of tooth molding roller body both sides; The periphery of described profile of tooth molding roller body is provided with many spiral-shaped helicla flutes, between described helicla flute, is provided with boss; The two ends of described profile of tooth molding roller body, be provided with the ring-shaped groove around outer circumference surface with the junction of described side roll.
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| CN104759502A (en) * | 2015-03-17 | 2015-07-08 | 中国科学院金属研究所 | Processing method for aluminum or aluminum alloy pipe with thread inner tendon |
| CN104827252A (en) * | 2015-05-11 | 2015-08-12 | 柳州金盾机械有限公司 | Machining method of threaded pipe |
| CN108225052A (en) * | 2018-01-16 | 2018-06-29 | 江门市汉尼科技有限公司 | Screw-type heat exchange structure and moulding process |
| CN110701943A (en) * | 2019-10-09 | 2020-01-17 | 珠海格力电器股份有限公司 | Evaporating pipe and manufacturing method thereof, evaporator and air conditioner |
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| CN104759502A (en) * | 2015-03-17 | 2015-07-08 | 中国科学院金属研究所 | Processing method for aluminum or aluminum alloy pipe with thread inner tendon |
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| CN110788570A (en) * | 2019-10-29 | 2020-02-14 | 武汉博金新材料科技有限公司 | Welding process for ultrathin-wall internal thread TA2 titanium radiating pipe |
| CN111069335A (en) * | 2019-12-23 | 2020-04-28 | 江苏统联科技股份有限公司 | Production method of embossed flat steel pipe |
| CN111069335B (en) * | 2019-12-23 | 2021-09-24 | 江苏统联科技股份有限公司 | Production method of embossed flat steel pipe |
| CN111644817A (en) * | 2020-06-15 | 2020-09-11 | 沈阳兴华航空电器有限责任公司 | Processing method of cap-connected part with inner wall arc spiral groove |
| CN111644817B (en) * | 2020-06-15 | 2022-03-11 | 沈阳兴华航空电器有限责任公司 | Processing method of cap-connected part with inner wall arc spiral groove |
| CN112404894A (en) * | 2020-10-26 | 2021-02-26 | 无锡英特派金属制品有限公司 | Preparation method of large length-diameter ratio, small-caliber and ultrathin platinum and platinum-rhodium alloy crucible |
| CN112404894B (en) * | 2020-10-26 | 2022-03-01 | 英特派铂业股份有限公司 | Preparation method of large length-diameter ratio, small-caliber and ultrathin platinum or platinum-rhodium alloy crucible |
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