CN107109531A - Heat exchanger inner face grooved pipe and its manufacture method - Google Patents
Heat exchanger inner face grooved pipe and its manufacture method Download PDFInfo
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- CN107109531A CN107109531A CN201580060474.8A CN201580060474A CN107109531A CN 107109531 A CN107109531 A CN 107109531A CN 201580060474 A CN201580060474 A CN 201580060474A CN 107109531 A CN107109531 A CN 107109531A
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- inner face
- processing
- grooved pipe
- heat exchanger
- pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/05—Alloys based on copper with manganese as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention relates to a kind of heat exchanger inner face grooved pipe, it is characterized in that, it is the heat exchanger inner face grooved pipe of copper alloy, the P and surplus that the copper alloy contains 0.004~0.040 mass % are made up of Cu and inevitable impurity, and the orientation density of the Goss orientations of the recrystallization texture of the copper alloy is more than 0 and less than 3.2.Moreover, it relates to a kind of manufacture method of heat exchanger with inner face grooved pipe, it is characterised in that the manufacture method carries out casting process, hot extrusion processing, cold working, intermediate heat-treatment, rollforming processing and final heat treatment successively；Or casting process, cold working, intermediate heat-treatment, rollforming processing and final heat treatment are carried out successively, in the casting process, the copper alloy that P of the casting containing 0.004~0.040 mass % and surplus are made up of Cu and inevitable impurity, is 6~16% from external diameter slip of the intermediate heat-treatment into the processing between the final heat treatment.According to the present invention it is possible to provide the inner face grooved pipe of the heat exchanger with excellent bendability.
Description
Technical field
The present invention relates to as the cross-fin type heat exchangers such as air-conditioning, Teat pump boiler (Ecocute) it is heat conducting pipe,
The inner face grooved pipe of excellent in workability.
Background technology
All the time, the heat conducting pipe or refrigerant piping of the use in refrigeration system heat exchanger such as room conditioning, box-type air conditioner are adopted mostly
With seamless copper pipe, the acquirement balance in terms of each physical property such as intensity, processability, thermal conductivity and material and processing cost is used
Phosphorous deoxidize copper tube (JIS H3300C1220T).
In these heat exchangers, mainly by inner face is implemented spiral helicine groove processing copper pipe (following, inner face grooved pipe),
Constituted with the fin (being below aluminum fin-stock) comprising aluminum or aluminum alloy plate.Specifically, for the heat-conducting part of heat exchanger, bending is made
Processing (following, hairpin bends processing) into U-shaped copper pipe by the through hole of aluminum fin-stock, in the copper pipe processed through hairpin bends
It is interior insertion fixture and carry out it is expanding so that inner face grooved pipe and aluminum fin-stock are closely sealed.Also, further make the hairpin bends copper pipe
Open end it is expanding, insert same bending machining into the curved copper pipe of U-shaped in the expanding open end, pass through the prickers such as P-Cu Brazing Materials
Wlding material, is brazed to the expanding open end of inner face grooved pipe by curved copper pipe and connects it, heat exchanger is made.
In recent years, in the copper pipe used as heat conducting pipe, needed with the requirement that the raising of heat conductivility, cost are reduced
Weight, i.e. thin footpath and thin-walled property are reduced, also has hairpin bends spacing to diminish and strictly under hairpin bends processing conditions
Tendency.Specifically, thin-walled property is carried out until wall thickness is less than 0.04 relative to the ratio (t/D) of external diameter, between hairpin bends
During away from being carried out under the conditions of small and strict hairpin bends, there is following problem：The inboard portion of hairpin bends produces fold, or curved
Bent portions are put down partially, or the value significantly damaged on exterior quality, are broken when extreme.
Improve the copper pipe of this bendability as have studied, find：The Sn containing 0.1~3.0 mass %,
In 0.005~0.1 mass % P copper alloy, by making average crystal particle diameter stably control for less than 30 μm, make processability
Excellent (patent document 1).
In addition, it is proposed that：It is conceived to texture, the Cu orientations, S orientations, Brass orientations of the beta of rolling texture will be belonged to
Each orientation average area rate sum be set to 10~25% scope, so as to improve copper pipe fracture strength and bending plus
Work (patent document 2).
Prior art literature
Patent document
Patent document 1：Japanese Patent No. 5107841
Patent document 2：Japanese Patent No. 5464659
The content of the invention
Problems to be solved by the invention
However, for above-mentioned prior art, in smooth pipe, although larger effect can be expected, but be used as heat conduction
Manage in the inner face grooved pipe that uses mostly, in addition to carrying out the hot extrusion of the manufacturing process as smooth pipe, cold rolling, cold-drawn,
Also carry out to say in intermediate annealing, cold-drawn, final annealing, the copper pipe of inner face trough of belt and form sufficient countermeasure.
Therefore, it is an object of the present invention to the problem of can solve the problem that above-mentioned existing there is provided with excellent bendability
Heat exchanger inner face trough of belt copper pipe.
The solution used to solve the problem
The present inventor etc. have been repeated further investigation, as a result found to solve above-mentioned problem, by the composition of copper alloy
Specific composition is set to, when manufacturing inner face grooved pipe using the copper alloy with the composition, final heat is being heat-treated to from centre
In processing between processing, by the way that external diameter slip is set into 6~16%, the orientation density that the Goss of recrystallization texture is orientated
Control can obtain the inner face grooved pipe of excellent in workability, so far complete the present invention below 3.2.
That is, (1) of the invention provides a kind of heat exchanger inner face grooved pipe, it is characterised in that it is the heat exchange of copper alloy
Device inner face grooved pipe,
The P and surplus that the copper alloy contains 0.004~0.040 mass % are made up of Cu and inevitable impurity,
The orientation density of the Goss orientations of the recrystallization texture of the copper alloy is more than 0 and less than 3.2.
In addition, (2) of the invention provide the heat exchanger inner face grooved pipe described in (1), it is characterised in that foregoing copper alloy is also
Contain the one kind or two or more member in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr that summation is below 0.07 mass %
Element.
In addition, (3) of the invention provide the manufacture method of heat exchanger inner face grooved pipe, it is characterised in that it is to enter successively
Row casting process, hot extrusion processing, cold working, intermediate heat-treatment, rollforming processing and final heat treatment；Or carry out successively
Casting process, cold working, intermediate heat-treatment, rollforming processing and final heat treatment heat exchanger inner face grooved pipe manufacture
Method,
In the casting process, cast the P containing 0.004~0.040 mass % and surplus is by Cu and inevitable impurity
The copper alloy of composition,
It is 6~16% from external diameter slip of the intermediate heat-treatment into the processing between the final heat treatment.
In addition, (4) of the invention provide the manufacture method of the heat exchanger inner face grooved pipe described in (3), it is characterised in that preceding
State copper alloy also containing summation for below 0.07 mass % 1 in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr kind or
Two or more element.
The effect of invention
In accordance with the invention it is possible to provide the inner face grooved pipe of the heat exchanger with excellent bendability.
Brief description of the drawings
Fig. 1 is the schematic diagram for showing hairpin bends part.
Fig. 2 is the schematic sectional view for the groove shape for showing inner face grooved pipe.
Fig. 3 is the schematic sectional view for the groove shape for showing inner face grooved pipe.
Embodiment
The heat exchanger inner face grooved pipe of the present invention is characterised by that it is the heat exchanger inner face trough of belt of copper alloy
Pipe,
The P and surplus that the copper alloy contains 0.004~0.040 mass % are made up of Cu and inevitable impurity,
The orientation density of the Goss orientations of the recrystallization texture of the copper alloy is more than 0 and less than 3.2.
First, illustrated for forming the heat exchanger of the present invention with the texture and characteristic of the copper alloy of inner face grooved pipe.
It is fine uniform in its recrystallization texture for the copper alloy for the heat exchanger inner face grooved pipe for forming the present invention
There is crystal grain in ground, the orientation density as little as less than 3.2 being orientated to Goss.
Here, the texture for copper product is illustrated.For polycrystalline materials such as copper, there is crystal grain mostly along some specific
The tissue of orientation, i.e. texture.As above-mentioned orientation, there are Cube orientations, Goss orientations, Brass orientations, S orientations, Copper
Orientation etc..In addition, crystal orientation it is dispersed and without accumulation when, texture is referred to as randomly.Additionally, it is known that：The volume fraction of texture
During change, plastic anisotropy changes.
Even if above-mentioned texture is that identical crystallographic system is different also according to processing method.Copper pipe is generally manufactured by extruding,
In the case of the texture of the copper pipe based on extruding, with extrusion tube blank in the same manner as the situation of the texture of the sheet material based on rolling
Compressive plane is represented with the direction of extrusion (rolling surface and rolling direction when rolling processing is carried out to extrusion tube blank).Compressive plane is to represent face
Miller indices (h k l) expression, the direction of extrusion using represent direction Miller indices [u v w] express (h, k, l, u, v and w as
Integer).Also, in the way of the condition for meeting hu+kv+lw=0, switching h, k and l and u, v and w order and collect what is obtained
24 kinds of equivalent orientation groups, are expressed as { h, k, l }<U, v, w>, it is used as the usual expression of orientation.
Based on above-mentioned expression, it is above-mentioned be respectively orientated it is as follows.
Cube is orientated：{001}<100>
Goss is orientated：{011}<100>
Brass is orientated：{011}<211>
Copper is orientated：{112}<111>
S is orientated：{123}<634>
The orientation density of above-mentioned texture refers to relative to the intensity of random orientation represent each orientation in the form of ratio.
In the present invention, identical orientation is defined as from the orientation within these ± 10 degree of orientation skews.But, on Copper orientation and
S is orientated, and the orientation offset within ± 9 degree is defined as into identical orientation.
The distribution of above-mentioned orientation density for example obtains crystal orientation distribution function (ODF) by using X-ray diffraction method
Determine.Specifically, analyzed by the pole figure determined using X-ray diffraction device using 3 D tropism and obtain ODF, so as to obtain
The orientation density of each crystal orientation.In ODF, the expansion number of times of even item is set to 22 by the Series Expansion Method proposed by Bunge
It is secondary, the expansion number of times of odd term is set to 19 times and calculated.It should be noted that orientation density is with the orientation density of particular orientation
Represented with the ratio between the orientation density with randomly-oriented sample, be designated as random ratio.For random intensity I r, pass through following formula self-inspection
Body probe intensity Ic is surveyed to calculate.
In above-mentioned numerical expression, α, β is determine angle, and Δ s is step angle.
The heat exchanger of the present invention from the viewpoint of bendability raising, will form inner face band with inner face grooved pipe
The allowance of in " the random texture " of the copper alloy of barrel, Goss orientations orientation density is set to less than 3.2, makes as far as possible
The orientation density of Goss orientations is low.It should be noted that in the random texture for the copper alloy for making to form inner face grooved pipe
Goss orientations disappear (make orientation density be 0) be difficult in manufacture, therefore the present invention heat exchanger with inner face grooved pipe,
The orientation density for forming the Goss orientations of the copper alloy of inner face grooved pipe is more than 0.
Also, the heat exchanger of the present invention is with inner face grooved pipe, if will make the hairpin bends processability of inner face grooved pipe
The orientation density of the Goss orientations of reduction is set to less than 3.2, then r values become more than 1, can suppress curved in hairpin bends processing
Buckling (buckling) on the inside of pars convoluta, bending section it is flat.That is, for the heat exchanger inner face grooved pipe of the present invention, pass through
The orientation density for being orientated the Goss for the copper alloy to form inner face grooved pipe is that, more than 0 and less than 3.2, can suppress hairpin bends
Buckling on the inside of the bending section in processing, bending section it is flat, therefore, with excellent processability.
On the other hand, formed the copper alloy of inner face grooved pipe Goss orientations orientation density more than 3.2 when, copper pipe is knitted
The crystal grain that there is Goss to be orientated in structure becomes excessive, and therefore, the r values of copper pipe significantly diminish, and becomes in hairpin bends processing
Inner face grooved pipe balance can not be made to deform well.As a result, buckling on the inside of the bending section of inner face grooved pipe, bending section
When flattening is extreme, crack.
For the above-mentioned orientation density being respectively orientated in addition to the Goss orientations for constituting random texture, if usual
Inner face grooved pipe manufacturing condition or manufacture method in the case of, then be respectively for example hardly to become big to exceeding within 10
10.Also, the heat exchanger of the present invention is with inner face grooved pipe, in addition to the Goss of copper alloy of inner face grooved pipe orientations are formed
The above-mentioned orientation density being respectively orientated is respectively within 10, to be difficult to produce large change in the manufacturing process of inner face grooved pipe, to inner face
The hairpin bends processability of grooved pipe does not have considerable influence.
In addition, the average crystalline grain of the heat exchanger of the present invention copper alloy in inner face grooved pipe, forming inner face grooved pipe
Footpath is preferably less than 30 μm.The thickness of inner face grooved pipe for it is thicker when, have little to no effect, but according to lightweight, thin-walled property
It is required that, when the thickness especially thin-walled of inner face grooved pipe is melted into less than 200 μm, the influence of the size of the crystal particle diameter significantly becomes big.
That is, when the average crystal particle diameter of copper alloy is excessive, it is impossible to avoid the tensile force by the circumferencial direction application to inner face grooved pipe from leading
" concentration of strain " when causing to crack, good deformation can not be carried out in hairpin bends processing.Even if as a result, control
The orientation density of above-mentioned Goss orientations, also is difficult to maintain good hairpin bends processability sometimes.
On the average crystal particle diameter of copper alloy, for the axially in parallel face with inner face grooved pipe, pass through JISH0501
The defined process of chopping, determines the average crystal particle diameter in the wall thickness direction of inner face grooved pipe, by axial times in inner face grooved pipe
The result of 10 position findings of meaning is averaged, and is used as average crystal particle diameter (μm).
Then, illustrated for the composition composition of the copper alloy for the heat exchanger inner face grooved pipe for forming the present invention.Shape
Copper alloy into the heat exchanger inner face grooved pipe of the present invention contains 0.004~0.040 mass % P and surplus by Cu and not
Evitable impurity composition.
In addition, heat exchanger of the invention is formed with the copper alloy of inner face grooved pipe in addition to containing P, can also be containing total
With the one kind or two or more element in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr for below 0.07 mass %.That is,
The copper alloy for forming the heat exchanger inner face grooved pipe of the present invention contains 0.004~0.040 mass % P, and summation is 0.07 matter
Below the % one kind or two or more element in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr is measured, and surplus is by Cu and not
Evitable impurity composition.
When the content of P in copper alloy is more than 0.04 mass %, stress corrosion cracking (SCC) sensitiveness is uprised, and thermal conductivity is significantly
Degree reduction, in addition, when P content is less than 0.004 mass %, the sensitiveness of oxygen amount increase and hydrogen embrittlement is carried due to deoxidation deficiency
Height, the viability reduction of ingot casting.Therefore, the P content for forming the copper alloy of the heat exchanger inner face grooved pipe of the present invention is 0.004
~0.040 mass %.
Fe, Mn, Mg, Cr, Ti and Zr improve the intensity, pressure-resistant fracture strength and heat resistance of copper alloy, make crystal grain micro-
Refinement, so as to improve the bendability of inner face grooved pipe.But, copper alloy contains selected from by Fe, Mn, Mg, Cr, Ti and Zr group
Into group in one kind or two or more element when, if the total content of these elements is more than 0.07 mass %, squeeze pressure rises,
, it is necessary to improve extrusion temperature when therefore, to be extruded with the situation identical extruding force without these elements, thus,
The surface oxidation of squeeze wood becomes many, therefore, multiple surface defect in inner face grooved pipe.In addition, in copper alloy be selected from by Fe,
When the total content of one kind or two or more element in the group of Mn, Mg, Cr, Ti and Zr composition is more than 0.07 mass %, Goss orientations
Orientation density more than 3.2.Therefore, formed the present invention heat exchanger inner face grooved pipe copper alloy contain selected from by Fe, Mn,
During one kind or two or more element in the group of Mg, Cr, Ti and Zr composition, the content of these contained elements is total in copper alloy
With for below 0.07 mass %, be preferably 0.01~0.07 mass %.
The heat exchanger of the present invention with the wall thickness of inner face grooved pipe relative to the ratio (t/D) of external diameter be preferably 0.020~
0.050th, it is particularly preferably 0.025~0.050.
The manufacture method of heat exchanger inner face grooved pipe of the present invention is characterised by, its for carry out successively casting process,
Hot extrusion processing, cold working, intermediate heat-treatment, rollforming processing and final heat treatment；Or casting process, cold is carried out successively
Processing, intermediate heat-treatment, rollforming processing and final heat treatment heat exchanger inner face grooved pipe manufacture method,
In the casting process, cast the P containing 0.004~0.040 mass % and surplus is by Cu and inevitable impurity
The copper alloy of composition,
It is 6~16% from external diameter slip of the intermediate heat-treatment into the processing between the final heat treatment.
In addition, the manufacture method of the heat exchanger inner face grooved pipe of the present invention is characterised by, it is to be cast successively
Process, hot extrusion processing, cold working, intermediate heat-treatment, rollforming processing and final heat treatment；Or founder is carried out successively
Sequence, cold working, intermediate heat-treatment, rollforming processing and final heat treatment heat exchanger inner face grooved pipe manufacture method,
In the casting process, casting the P containing 0.004~0.040 mass % and summation for 0.07 mass % be selected from by
One kind or two or more element and surplus in the group of Fe, Mn, Mg, Cr, Ti and Zr composition are made up of Cu and inevitable impurity
Copper alloy,
It is 6~16% from external diameter slip of the intermediate heat-treatment into the processing between the final heat treatment.
In manufacture method of the heat exchanger with inner face grooved pipe of the present invention, casting process is carried out successively, it is hot extrusion processing, cold
Processing, intermediate heat-treatment, rollforming processing and final heat treatment；Or casting process, cold working are carried out successively, at intermediate heat
Reason, rollforming processing and final heat treatment.If, can be as needed it should be noted that carry out these processes successively
In the range of effect of the present invention is not damaged, various processing or heat treatment are carried out between these processes.
In casting process, the ingot casting of the copper alloy of the regulation chemical composition containing ormal weight is cast, regulation is made
The steel billet of size.For example, in casting process, the cathode copper of raw material being melted in the state of charcoal covering, melts after copper, takes into account
Deoxidation and add P as Cu-15 mass %P intermediate alloys.After constituent adjustment terminates, given size is made by semi-continuous casting
Steel billet.
In hot extrusion processing, first, above-mentioned steel billet is heated to defined temperature with heating furnace before hot extrusion processing, entered
Row homogenize process.Then, hot extrusion is extruded by plug and carried out, i.e., to processing it is preceding with the steel billet of cold working pre-punching or
Inserted in the steel billet perforated before extruding with hot-working in the state of plug, carry out hot extrusion, obtain seamless hot extrusion pipe.
Seamless hot extrusion pipe obtained from by carrying out hot extrusion processing is cooled down rapidly after hot extrusion.Cooling is as follows
Carry out：Seamless hot extrusion pipe is extruded into water；Or, put into the seamless hot extrusion pipe after hot extrusion into water, so that
Carry out.
In cold working, rolling processing is carried out to extrusion tube blank and drawing is processed, external diameter and wall thickness is reduced.Rolling processing
In, less than 92% is calculated as by making working modulus with section slip, product when can reduce rolling is bad.Drawing processing is usual
By repeatedly processing progress, it is less than 35% by making the working modulus (section slip) in 1 drawing, can reduces in pipe
Surface defect and underbead crack.
In intermediate heat-treatment, heated, made in rollforming manufacturing procedure by 400~700 DEG C with keeping temperature
Rollforming processing becomes easy.The programming rate of intermediate heat-treatment is more than 20 DEG C/min, is preferably more than 40 DEG C/min.
When keeping temperature in intermediate heat-treatment is less than 400 DEG C, the texture of Goss orientations is excessively flourishing, therefore, the orientation of Goss orientations
Density is more than 3.2, it is impossible to obtain good hairpin bends processability, in addition, during more than 700 DEG C, coarse grains, as rolling
The reason for bad order in forming.
Rollforming is processed as the process for be formed the rollforming processing of inner surface slot in the inner face of tube material, in centre
Configuration implements the rollforming connector of spiral helicine groove processing to outside in seamless pipe after heat treatment, passes through high speed rotation
Multiple rollforming balls, press from the external diameter of pipe, the groove of rollforming connector are transferred to the inner face of pipe, so as to carry out.In addition,
Generally, carry out after intermediate heat-treatment, processed according to the undergauge for reducing copper pipe diameter and carry out rollforming processing.
It is final to carrying out after intermediate heat-treatment for carrying out in manufacture method of the heat exchanger of the present invention with inner face grooved pipe
For processing between before heat treatment, in the manufacture method of heat exchanger of the invention with inner face grooved pipe, at underway heat
After reason between carrying out before final heat treatment, processed according to undergauge and carry out rollforming processing.Also, carry out intermediate heat-treatment
The external diameter degree of finish in the processing between carrying out before final heat treatment assigns considerable influence for the formation of recrystallization texture afterwards.
Therefore, in manufacture method of the heat exchanger with inner face grooved pipe of the present invention, by making to be heat-treated to final heat treatment from centre
Between processing in external diameter slip be less than 16%, can make the orientation density that the Goss in recrystallization texture is orientated be
3.2 it is following.But, even if wanting to make the external diameter slip in rollforming processing not keeping being used for less than 6%, on inner face
Progress can not carry out rollforming processing with the connector of groove processing.Therefore, the system of heat exchanger of the invention inner face grooved pipe
Make in method, the external diameter slip being heat-treated to from centre in the processing between final heat treatment is set to 6~16%.Need
Bright, the external diameter slip being heat-treated to from centre in the processing between final heat treatment refers to：By " ((outer before processing
External diameter after footpath-processing) external diameter before/processing) × 100 " formula calculates, and carry out undergauge processing and rollforming processes
In manufacture method of the heat exchanger of the present invention with inner face grooved pipe, the external diameter of the pipe after undergauge and rollforming processing is relative to contracting
The slip of the external diameter of pipe before footpath and rollforming processing.
In final heat treatment, keeping temperature is preferably set to 400~600 DEG C.In addition, the processing time of final heat treatment with
The tensile strength of inner face grooved pipe, 0.2% proof stress (proof stress) and elongation turn into the side of prescribed limit
Formula is suitably selected.
Here, when the cooling velocity in final heat treatment is slow, Goss orientations become easily to reach in cooling procedure, it is difficult to
The orientation density for being orientated the Goss in the texture of inner face grooved pipe is less than 3.2, in addition, crystal grain becomes easy in cooling procedure
Coarsening.Therefore, the cooling velocity of final heat treatment be more than 1.0 DEG C/min, preferably more than 5.0 DEG C/min, it is especially excellent
Elect more than 20.0 DEG C/min as.In addition, in order to not make the putting down to set point of temperature of the room temperature in coarse grains, final heat treatment
Equal programming rate is also comparatively fast preferred.When programming rate in final heat treatment is slow compared with 5 DEG C/min, even if being heated to phase
It is synthermal also easily to make coarse grains, pressure-resistant fracture strength and the easy step-down of hairpin bends processability, further become obstruction life
Yield.Therefore, the average heating speed of the room temperature in final heat treatment to set point of temperature is preferably more than 5 DEG C/min.
Hereinafter, embodiment is enumerated the present invention is further specifically described, but its is merely illustrative, does not limit this hair
It is bright.
Embodiment
Hereinafter, the embodiment of the copper pipe of inner face trough of belt is shown.
(1) ingot casting of the chemical composition shown in table 1 is melted and cast, make the steel billet of hot extrusion.(2) heat
Above-mentioned steel billet, hot extrusion is carried out at 850 DEG C, extrusion tube blank is obtained.Then, the extrusion tube blank of hot extrusion is squeezed in water
Press and be quenched.
Internal diameter about 75mm is carried out before extruding with hot-working to perforate.
The external diameter of extrusion tube blank is that 102mm, internal diameter are 75mm.
(3) it is above-mentioned extrusion tube blank is cold rolling by the progress of pilger mill roll mills, obtain rolling pipe.
The external diameter of rolling pipe is that 46mm, internal diameter are 39.8mm.
Degree of finish (section slip) in cold rolling is 88.9%.
Section slip (%)=(sectional area before (sectional area after sectional area-processing before processing)/processing) × 100
(4) the rolling pipe is subjected to multiple drawing with cold working, obtains drawing pipe.
The external diameter of drawing pipe is that 7.8~10.0mm, bottom wall thickness are 0.19~0.25mm.
Degree of finish in cold-drawn entirety is calculated as 97.1~98.3% with section slip.
Total degree of finish of cold rolling and cold-drawn, i.e. cold worked total degree of finish be calculated as 99.8 with section slip~
99.9%.
(5) above-mentioned drawing pipe is subjected to intermediate heat-treatment, obtains the former pipe for being supplied to rollforming processing.
Intermediate heat-treatment is with 530 DEG C of implementations of keeping temperature.
(6) above-mentioned former pipe is subjected to ball rollforming processing, obtains inner face grooved pipe.
<The dimensions of inner face grooved pipe>
External diameter：7.0mm
Wall thickness (in Fig. 2, symbol t)：0.17mm
Fin height (in Fig. 2, symbol h)：0.16mm
Fin drift angle (in Fig. 2, symbol γ)：10°
Groove bar number：45
Lead angle (lead angle) α (in Fig. 3, symbol α)：30°
Degree of finish in rollforming processing is calculated by following formula.
Sectional area slip (%)=(sectional area before (sectional area after sectional area-processing before processing)/processing) ×
100
External diameter slip (%)=(external diameter before (external diameter after external diameter-processing before processing)/processing) × 100
Wall thickness slip (%)=(wall thickness before (bottom wall after bottom wall thickness-processing before processing is thick)/processing) × 100
(7) above-mentioned inner face grooved pipe is batched and rolled up in cylindric permutation multilayer, make mode from inner face side uncoiling
LWC.Then, the final heat treatment of following conditions is carried out, inner face grooved pipe (level wound coil (level wound coil are obtained
(LWC)))。
Heat treatment method：Carried out with roller bottom continuous annealing furnace.
Condition：Keeping temperature is with 500 DEG C of implementations.
[table 1]
On the inner face grooved pipe of manufacture, average crystal particle diameter, crystal orientation distribution function are evaluated in the following manner
(ODF), tensile properties, hairpin bends processability.Its result is recorded in table 2.
<Average crystal particle diameter>
For the axially in parallel face with copper pipe, by the process of chopping as defined in JISH0501, the wall thickness direction of copper pipe is determined
Average crystal particle diameter, the result of axial any 10 position findings in copper pipe is averaged, be used as average crystalline grain
Footpath (μm).
<Crystal orientation distribution function (ODF)>
Three are utilized by the pole figure determined by X-ray diffraction device (Rigaku Corporation RINT2000)
Dimension orientation analysis obtains ODF, thus obtains the orientation density of each crystal orientation.For ODF, the series exhibition proposed by Bunge
Method is opened the expansion number of times of even item is set into 22 times, the expansion number of times of odd term is set into 19 times to calculate.It should be noted that
Orientation density, with having the ratio between orientation density of randomly-oriented sample to represent, is designated as random with the orientation density of particular orientation
Than.For random intensity I r, calculated by detection body probe intensity Ic by following formula.
<Tensile properties>
Pass through stretching test measurement r values.Test film is set to JIS Z2201 No. 11 test films, beats clamping part and is made
Plain film.Apply 20% with the accurate universal testing machine of Instron type to the test film to strain, determine external diameter variable quantity, the wall of copper pipe
Thick variable quantity, calculates r values.
<Hairpin bends processability>
The external diameter of mandrel is set to 6.15mm, bending spacing is set to 16mm, the evaluation of hair clip processability is carried out.For each
The inner face grooved pipe of embodiment and comparative example, the experiment of each 20 of progress.Evaluate as follows.
(I) fold is produced
The quantity of the inner face grooved pipe of the inboard portion generation fold of hairpin bends is counted, fold is obtained with following formula and produced
Rate.Fold generation rate is set to qualified (zero) for 0% situation.
Fold generation rate (%)=(radical for producing the pipe of fold/radical for the pipe tested) × 100
(II) flat ratio
With the flat ratio of following bending sections calculated after hairpin bends.
Flat ratio (%)=((maximum outside diameter-minimum outer diameter)/nominal outside diameter) × 100
It should be noted that locating as 45 °, 90 °, 135 ° of positions in hairpin bends portion, nominal outside diameter is in this example
For 7.0mm.It should be noted that 45 ° of hairpin bends portion, 90 °, 135 ° refer to as shown in figure 1, bending inner face grooved pipe
45 ° of position (symbol a), position (symbol b), position (the symbol c) of 135 ° of bending of 90-degree bent.Obtain each inner face of experiment
The flat ratio of grooved pipe, the average value of flat ratio is set to qualified (zero) for less than 15% situation.
[table 2]
In embodiment E1~E6, as shown in table 1 by the way that the external diameter slip in rollforming process is set into 6~16%,
The orientation density of Goss orientations in recrystallization texture shown in table 2 is less than 3.2, r values up to more than 1.In addition, E7~
In E12, by make external diameter slip be also 6~16%, Goss orientation orientation density be also less than 3.2, r values also up to 1 with
On.Thus, in embodiment E1~E12, good hairpin bends processability can be obtained.
For comparative example C1, C2, the external diameter slip in being processed due to rollforming is less than 6%, it is impossible to keep being used for pair
Inner face carries out the connector with groove processing, and can not carry out rollforming processing.
In comparative example C3~C5, although can carry out rollforming processing, but be due to external diameter slip more than 16%,
The orientation density of Goss orientations is uprised compared with 3.2, and r values have decreased below 1, it is impossible to obtain necessary hairpin bends processability.
In comparative example C6~C12, because composition composition exceedes ormal weight, taken even if external diameter slip is 6~16%, Goss
To orientation density can also uprise, hairpin bends processability step-down.
Description of reference numerals
L pipe axles
P bends spacing
T wall thickness (bottom wall is thick)
H fin heights
The most deep position of s inner surface slots
γ fin drift angles
α lead angles
Claims (4)
1. a kind of heat exchanger inner face grooved pipe, it is characterised in that it is the heat exchanger inner face grooved pipe of copper alloy,
The P and surplus that the copper alloy contains 0.004~0.040 mass % are made up of Cu and inevitable impurity,
The orientation density of the Goss orientations of the recrystallization texture of the copper alloy is more than 0 and less than 3.2.
2. heat exchanger according to claim 1 inner face grooved pipe, it is characterised in that the copper alloy is also containing summation
Below the 0.07 mass % one kind or two or more element in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr.
3. a kind of heat exchanger manufacture method of inner face grooved pipe, it is characterised in that it is progress casting process, hot extrusion successively
Processing, cold working, intermediate heat-treatment, rollforming processing and final heat treatment；Or successively carry out casting process, cold working,
The manufacture method of the heat exchanger inner face grooved pipe of intermediate heat-treatment, rollforming processing and final heat treatment,
In the casting process, cast the P containing 0.004~0.040 mass % and surplus is made up of Cu and inevitable impurity
Copper alloy,
It is 6~16% from external diameter slip of the intermediate heat-treatment into the processing between the final heat treatment.
4. the heat exchanger according to claim 3 manufacture method of inner face grooved pipe, it is characterised in that the copper alloy is also
Contain the one kind or two or more member in the group being made up of Fe, Mn, Mg, Cr, Ti and Zr that summation is below 0.07 mass %
Element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014225010A JP6388398B2 (en) | 2014-11-05 | 2014-11-05 | Internal grooved tube for heat exchanger and its manufacturing method |
| JP2014-225010 | 2014-11-05 | ||
| PCT/JP2015/080495 WO2016072339A1 (en) | 2014-11-05 | 2015-10-29 | Pipe with grooved inner surface for heat exchanger, and process for producing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107109531A true CN107109531A (en) | 2017-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580060474.8A Pending CN107109531A (en) | 2014-11-05 | 2015-10-29 | Heat exchanger inner face grooved pipe and its manufacture method |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6388398B2 (en) |
| CN (1) | CN107109531A (en) |
| MY (1) | MY181594A (en) |
| WO (1) | WO2016072339A1 (en) |
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| JP6964498B2 (en) * | 2016-11-30 | 2021-11-10 | 三菱アルミニウム株式会社 | Manufacturing method of inner spiral grooved tube, heat exchanger and inner spiral grooved tube |
| WO2022224940A1 (en) * | 2021-04-19 | 2022-10-27 | 株式会社 Kmct | Corrosion-resistant copper alloy, copper alloy pipe and heat exchanger |
| JP7491960B2 (en) | 2021-04-19 | 2024-05-28 | 株式会社Kmct | Corrosion-resistant copper alloys, copper alloy tubes and heat exchangers |
| JP2024055690A (en) * | 2022-10-07 | 2024-04-18 | 株式会社Kmct | Corrosion-resistant copper alloys, copper alloy tubes and heat exchangers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469961A (en) * | 2007-10-23 | 2009-07-01 | 株式会社科倍可菱材料 | Copper alloy tube for heat exchanger excellent in fracture strength |
| JP2011168846A (en) * | 2010-02-19 | 2011-09-01 | Kobe Steel Ltd | Copper tube for heat exchanger having excellent fracture strength and bending workability |
| CN105143479A (en) * | 2013-03-11 | 2015-12-09 | 株式会社Uacj | Copper alloy seamless tube for heat transfer tube |
-
2014
- 2014-11-05 JP JP2014225010A patent/JP6388398B2/en active Active
-
2015
- 2015-10-29 MY MYPI2017701517A patent/MY181594A/en unknown
- 2015-10-29 CN CN201580060474.8A patent/CN107109531A/en active Pending
- 2015-10-29 WO PCT/JP2015/080495 patent/WO2016072339A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469961A (en) * | 2007-10-23 | 2009-07-01 | 株式会社科倍可菱材料 | Copper alloy tube for heat exchanger excellent in fracture strength |
| JP2011168846A (en) * | 2010-02-19 | 2011-09-01 | Kobe Steel Ltd | Copper tube for heat exchanger having excellent fracture strength and bending workability |
| CN105143479A (en) * | 2013-03-11 | 2015-12-09 | 株式会社Uacj | Copper alloy seamless tube for heat transfer tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6388398B2 (en) | 2018-09-12 |
| JP2016089217A (en) | 2016-05-23 |
| WO2016072339A1 (en) | 2016-05-12 |
| MY181594A (en) | 2020-12-29 |
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