CN110918753A - Expansion die for single-side blown-expansion evaporator and processing technology - Google Patents
Expansion die for single-side blown-expansion evaporator and processing technology Download PDFInfo
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- CN110918753A CN110918753A CN201911011390.1A CN201911011390A CN110918753A CN 110918753 A CN110918753 A CN 110918753A CN 201911011390 A CN201911011390 A CN 201911011390A CN 110918753 A CN110918753 A CN 110918753A
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- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- 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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
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- 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
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention discloses a processing technology of a single-side blown-up evaporator expansion die, which comprises the following steps: blanking, wherein the upper plate and the lower plate are made of two different material profiles, the upper plate is made of an aluminum alloy plate, the surface of the printing pipeline is the lower plate, and a pure aluminum plate is selected; roughening: and (3) printing a lower plate of the printing pipeline by adopting a roller-shaped roughening machine, combining and buckling the upper plate with the printing pipeline and the lower plate with the blunt aluminum plate, hot rolling the riveted upper and lower plates, annealing at high temperature, leveling a prying opening, drawing a line and shearing at high pressure, and stamping. The technical scheme solves the problem of flatness of the back of the single-face blowing evaporator, the flatness can be controlled within 0.1-0.2mm by changing the processing technology and the design of the expansion die and using a special alloy aluminum plate material, the consistency of the content agent in the pipeline and the consistency of the expansion height are ensured, and meanwhile, the problem of deicing of the refrigerator is solved, and the heat exchange efficiency is improved.
Description
Technical Field
The invention relates to a single-side blowing expansion type evaporator expansion die and a process, wherein the blowing expansion type evaporator is widely applied to refrigerators with less than 200L, such as beer cabinets, cola cabinets, supermarket display cabinets, small refrigerators in hotels and the like.
Background
There are two types of existing roll-bond evaporators: a double-sided pipeline inflation structure and a single-sided pipeline inflation structure; 1. the double-faced pipeline blowing-up structure pipeline is uniformly distributed on two sides of a board surface, the whole thickness of the pipeline is about 4.2mm, the width of a bulging pipeline is usually 6-12mm, and a double-faced blowing-up structure aluminum board material is usually selected from 1 series of boards such as 1050/1060/1070. The product with the 'double-sided pipeline blowing' structure has the problems that the difficulty needs to be solved at present, icing and deicing on the plate surface are difficult, and formed ice is difficult to remove due to the uneven pipeline, so that the refrigeration effect of a refrigerator is influenced, the attractiveness of an evaporator is also influenced, and the problem needs to be solved urgently;
the existing 'single-side pipeline blowing' structure is that a pipeline is arranged on a single side, the other side is a plane, the traditional single-side pipeline blowing adopts 1 series of plates such as 1050/1060/1070 and the like, because of the performance problem of the plate material and different processing techniques, the flatness national standard of the back surface of the evaporator is less than or equal to 0.8mm, the national standard is less than or equal to 0.4mm, but the obvious slight bulge of the pipeline on the back can be clearly seen by visual inspection, the prior processing technology adopts a sponge cushion and rubber air cushion mould method for expansion, the two expanding processes are simple to operate and easy to form, but the flatness of the back surface is not good due to the excessively low expanding pressure and back pressure, meanwhile, the service life of the sponge and the rubber material is short, the cost is high, the content agent in the pipeline is not stably controlled, the expansion height is not easily controlled, and the problem still needs to be solved urgently when the refrigerator is deiced because the back surface of the pipeline still protrudes; when the existing single-face blowing is used as a refrigeration evaporator in a refrigerator, due to the fact that slight pipeline bulges still exist on the back face, the adhesion between the plate face and the outer side plane of the inner container of the refrigerator body is not firm, the contact area is reduced, the refrigerator is easy to crack after foaming, the refrigeration effect is affected, and the quality risks such as non-stop and non-refrigeration of the refrigerator occur under severe conditions.
Disclosure of Invention
The invention aims to provide a processing technology of a single-side roll-bond evaporator expansion die, which is not smooth in flatness in a roll-bond process, solves the problem of difficult precipitation and avoids the condition that a refrigerator does not stop and does not refrigerate.
The task of the invention is achieved in that: the method comprises the following steps:
a. blanking;
b. roughening;
c. printing and drying;
d. riveting;
e. hot rolling at high temperature;
f. annealing at high temperature;
g. leveling the prying opening;
h. high-pressure expansion;
i. scribing and shearing;
j. and (6) stamping.
The technical proposal completes the processing and the manufacture of the single-sided roll-bond evaporator by the above 10 process steps,
a: blanking, wherein the upper plate and the lower plate are made of two different material profiles, the upper plate is made of an aluminum alloy plate, the surface of the printing pipeline is the lower plate, and a pure aluminum plate is selected;
b: roughening: b, adopting a roller-shaped roughening machine to control the surface roughness of the lower pure aluminum plate in the step a to be uniform after a Ra6.3-Ra12.5 aluminum plate is roughened visually;
c: printing and drying, namely printing the plates under the printing pipelines in the step a and the step b to manufacture the printing screen pipeline, wherein the printing screen pipeline is required to be clear, free of deformation, degumming and damage, the printing pipeline pattern is required to meet the positioning requirement, the parallelism is not more than 0.2mm, the printing pipeline is made of graphite, the graphite material of the pipeline is printed on the surface of the printed pure aluminum plywood when the graphite material is printed, and then the surface is dried at 150 degrees after being processed by 100 degrees;
d: riveting: c, combining and buckling the upper board surface with the printing pipeline and the lower board surface of the blunt aluminum board obtained in the step c, and riveting the riveting point at the edge of the tail end of the upper board surface of the printing pipeline in an area 10mm away from the board edge;
e: d, high-temperature hot hole rolling, namely hot rolling the upper plate surface and the lower plate surface which are riveted in the step d, preheating the upper plate surface and the lower plate surface before hot rolling, wherein the preheating process is to select a hot roll, the width of the riveted upper plate surface and the riveted lower plate surface is 300-450mm, the preheating humidity of the roll is 40-50 ℃, hot rolling is carried out after preheating, and the temperature of the hot roll in the hot rolling process is 45-60 ℃; annealing the upper and lower plate surfaces after hot rolling, heating to 500-550 ℃, wherein the upper and lower plate surfaces are required to be uniformly heated, the heating time is controlled to be 25-30 minutes, rolling is started, the temperature of a roller is controlled by cooling liquid, a graphite isolation part is arranged in the middle of the lower plate aluminum plate after high-temperature and high-pressure rolling, the two upper and lower plate surfaces are tightly attached and fused together, and the thickness of the fused plate surface is controlled to be 0.9-2.0 mm;
f: high-temperature annealing: c, the plate surfaces fused together in the step e are subjected to high-temperature annealing treatment due to the fact that the hardness of the plate surfaces is too high due to stress concentration inside the aluminum plate, the annealing temperature is controlled to be 400-450 degrees, the annealing time is 4 hours, and the heat preservation time is 5-6 hours;
g. leveling the prying port: opening the upper plate surface of the pure aluminum plate, wherein the edge of the opening is free of fracture and burr after opening, the depth of the opening is 0.65-0.75mm, and the plate surface is required not to be pierced;
h. high-pressure expansion: c, if the board surface with the printed pipeline obtained in the step c still has slight printed pipeline which is not flat, and the flatness is required to be 0.1-0.2mm, a special expansion mould is adopted for high-pressure expansion correction;
i. drawing and shearing: and drawing a vertical right-angle line segment by drawing according to the reference of the line drawing plate, wherein the maximum error is not more than +/-2 mm. The size of the sheared workpiece meets the process requirements, the diagonal error is less than or equal to 2mm, and the sheared surface has no scratch or pit collision phenomenon;
j. stamping: according to the corresponding integral stamping die, the stamping is that the product is close to and positioned and is stamped at one time, and the stamped product has no defects of burrs, scratches and the like.
The thickness of the plate is 1.6-3mm respectively; the tensile strength of the alloy aluminum plate is as follows: 135-165MPa, elongation > 15%, hardness requirement 30-50 (HV); 1, 75-85MPa of pure aluminum plate, more than 15% of elongation and 20-23 (HV) of hardness requirement; the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
Rolling the plate surface with the width of more than 450mm of the upper and lower plate surfaces at the linear speed of 300r/min, rolling the plate surface with the width of less than 350-400r/min, rolling the plate surface with the length of more than 1100mm and the width of less than 450mm at the linear speed of 300 r/min.
Steel is selected to the bloated type mould material, is provided with the back pressure on the mould body and goes the chamber and back pressure line intracavity processing has inlet port and exhaust hole, and the front end processing of mould body has the bloated type to be connected with the bloated type press through the high-pressure gas area, and the outside that the chamber was gone to the back pressure is provided with the sealed annular, the inlet port passes through the pipeline and goes the chamber with the back pressure to be connected, the exhaust hole passes through the pipeline and goes the chamber with the back pressure to be connected, be connected with relief pressure valve and solenoid electric valve on the high-pressure gas area, and solenoid electric valve passes through data line and.
The pressure of the selected expanding press is 9-12Mpa, and the back pressure is 3-7 Mpa.
Placing the upper expanded plate with the printing pipeline in a mold 1, placing the pure aluminum plate in a back pressure cavity 2 with the surface facing downwards, connecting an air inlet pipeline and an exhaust pipeline to ensure air inlet balance, inputting parameters into a control electromagnetic control valve by an air leakage-free electric controller when the exhaust pipeline is connected, starting an air inlet device, and lifting a template after the expansion action of the main cylinder pressure of 20MPa and the back pressure of 3-5MPa is completed by the expansion pressure of 9-12 MPa; the expansion flatness can be controlled between 0.1mm and 0.2mm by adopting the process.
The invention has the following effects: the technical scheme solves the problem of flatness of the back of the single-side blown evaporator, the flatness can be controlled within 0.1-0.2mm by changing the processing technology and the design of the expansion die and using a special alloy aluminum plate material, the consistency and the consistency of the expansion height are ensured by the pipeline content agent, the problem of deicing of the refrigerator is solved, and the flatness is smoother and is convenient to deice; when the single-side blowing-up is used as a refrigeration evaporator, the flatness of the back side is greatly improved, the contact area is more closely avoided, the problems of non-stop and non-refrigeration of the refrigerator are solved, and the heat exchange efficiency is improved.
Drawings
FIG. 1 is a schematic view of an expanded configuration; FIG. 2 is a top view of FIG. 1; FIG. 3 is an enlarged view of the back pressure chamber of FIG. 2; FIG. 4 is a schematic view of a structure before flatness improvement; fig. 5 is a schematic view of the structure after flatness improvement.
Description of the drawings: 1. the device comprises a die, 2, a back pressure cavity, 3, an air inlet, 4, an exhaust hole, 5, an expansion type inflation hole, 6, a sealing ring groove, 7, a pressure reducing valve, 8 and an electromagnetic control valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The specific embodiment comprises the following steps:
a. blanking;
b. roughening;
c. printing and drying;
d. riveting;
e. hot rolling at high temperature;
f. annealing at high temperature;
g. leveling the prying opening;
h. high-pressure expansion;
i. scribing and shearing;
j. and (6) stamping.
The technical proposal completes the processing and the manufacture of the single-sided roll-bond evaporator by the above 10 process steps,
a: blanking, wherein the upper plate and the lower plate are made of two different material profiles, the upper plate surface is made of an aluminum alloy plate, the surface of the printing pipeline is the lower plate, and a pure aluminum plate is selected, wherein the aluminum alloy plate and the pure aluminum plate can be made of plates with the thickness within the range of 1.6-3 mm; the tensile strength of the alloy aluminum plate is as follows: 135-165MPa, elongation > 15%, hardness requirement 30-50 (HV); 1, 75-85MPa of pure aluminum plate, more than 15% of elongation and 20-23 (HV) of hardness requirement; the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
The aluminum alloy plate and the pure aluminum plate can be both plates with the thickness within the range of 1.6-3 mm; the tensile strength of the alloy aluminum plate is as follows: 135MPa, elongation > 15% and hardness requirement 30 (HV); 1, 75MPa of pure aluminum plate, more than 15 percent of elongation and 20 (HV) of hardness requirement; the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
The thickness of the aluminum alloy plate and the pure aluminum plate can be selected from the range of 1.6-3 mm; the tensile strength of the alloy aluminum plate is as follows: 150MPa, elongation rate of more than 15 percent and hardness requirement of 40 (HV); 1, a pure aluminum plate 80MPa, an elongation rate of more than 15 percent and a hardness requirement of 21.5 (HV); the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
The thickness of the aluminum alloy plate and the pure aluminum plate can be both selected from the plate with the thickness within the range of 1.6-3 mm; the tensile strength of the alloy aluminum plate is as follows: 165MPa, elongation > 15% and hardness requirement 50 (HV); 1, a pure aluminum plate 85MPa, an elongation rate of more than 15 percent and a hardness requirement of 23 (HV); the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
b: roughening: and (2) adopting a roller-shaped roughening machine, controlling the surface roughness of the lower pure aluminum plate in the step a to be uniform after visual roughening of a Ra6.3-Ra12.5 aluminum plate, enabling the surface of the plate to have vertical line-shaped lines without residual scraps, orange peel and bright lines, and enabling the surface of the aluminum alloy plate to be flat and smooth.
Controlling the surface roughness of the lower pure aluminum plate in the step a to be uniform after a Ra6.3 aluminum plate is roughened visually;
and c, controlling the surface roughness of the lower pure aluminum plate in the step a to be uniform after the Ra9.3 aluminum plate is roughened visually.
And c, controlling the surface roughness of the lower pure aluminum plate in the step a to be uniform after a Ra12.5 aluminum plate is roughened visually.
c: and c, printing and drying, namely printing the plates under the printing pipelines in the step a and the step b to manufacture a printing screen pipeline, wherein the printing screen pipeline is required to be clear, free of deformation, degumming and damage, the pattern of the printing pipeline is required to meet the positioning requirement, the parallelism is not more than 0.2mm, the temperature and the humidity in the printing chamber are executed according to the requirement of a quality control book in the printing process, the printing pipeline is made of graphite, and the graphite has the viscosity: stirring the graphite material uniformly by using a stirrer at 30-50 (shown in the table) and 15000-25000MPa.s, printing the graphite material on the surface of a pure aluminum plate, and drying the surface at 150 ℃ by using a stirrer at 100-.
The printing pipeline is made of graphite, and the viscosity of the graphite is as follows: stirring the graphite material uniformly by using a stirrer at 30 (shown in the table) and 15000MPa.s, printing the graphite material on the surface of a pure aluminum plate, and drying the surface at 100 ℃.
The printing pipeline is made of graphite, and the viscosity of the graphite is as follows: stirring the graphite material uniformly by using a stirrer at 40 (shown in the table) and 20000MPa.s, printing the graphite material on the surface of a pure aluminum plate, and drying the surface at 125 ℃.
The printing pipeline is made of graphite, and the viscosity of the graphite is as follows: and (3) uniformly stirring the graphite material by using a stirrer at 50 (shown in the table) and 25000MPa.s, printing the graphite material on the surface of the pure aluminum plate, and drying the surface at 150 ℃.
d: riveting: and c, combining and buckling the upper board surface with the printing pipeline and the lower board surface with the blunt aluminum board obtained in the step c, riveting the riveting points at the edge of the tail end of the upper board surface of the printing pipeline in an area which is 10mm away from the board edge, and uniformly placing the front ends and two sides of the two board surfaces of the riveted upper board surface and the riveted lower board surface without dislocation according to the fact that riveting is firm and cracking-free.
e: d, high-temperature hot hole rolling, namely hot rolling the upper plate surface and the lower plate surface which are riveted in the step d, preheating the upper plate surface and the lower plate surface before hot rolling, wherein the preheating process is to select a hot roll, the width of the riveted upper plate surface and the riveted lower plate surface is 300-450mm, the preheating humidity of the roll is 40-50 ℃, hot rolling is carried out after preheating, and the temperature of the hot roll in the hot rolling process is 45-60 ℃; if the width of the upper plate surface and the lower plate surface is 450-600mm, the preheating temperature of the hot rolling roll is 48-60 ℃, and the roll temperature in the normal hot rolling process is 48-70 ℃; rolling the plate with the width of the upper plate and the lower plate being more than 450mm at the linear speed of 300r/min, rolling the plate with the width of the upper plate and the lower plate being less than 350-400r/min, rolling the plate with the length of more than 1100mm and the width of less than 450mm at the linear speed of 300r/min, annealing and heating the upper plate and the lower plate after hot rolling to the temperature of 500-550 ℃, wherein the upper plate and the lower plate are required to be heated uniformly, the heating time is controlled to be 25-30 minutes, rolling is started, the temperature of the roller is controlled by cooling liquid, the lower plate is provided with a graphite isolation part in the middle after high-temperature and high-pressure rolling, the two upper plate and lower plate are tightly jointed together, the thickness of the jointed plate is controlled to be 0.9-2.0mm, and the thickness of the plate is selected by.
The width of the lower plate surface is 300mm, the preheating humidity of the roller is 40 ℃, hot rolling is carried out after preheating, and the temperature of the hot roller in the hot rolling process is 45 ℃; if the width of the upper plate surface and the lower plate surface is 450mm, the preheating temperature of a hot rolling roll is 48 ℃, and the roll temperature in the normal hot rolling process is 48 ℃; rolling the plate with the width of the upper plate and the lower plate being more than 450mm at the linear speed of 300r/min, rolling the plate with the width of the upper plate and the lower plate being less than 350r/min, rolling the plate with the length of more than 1100mm and the width of less than 450mm at the linear speed of 300r/min, annealing the upper plate and the lower plate after hot rolling, heating to 500 degrees, requiring the upper plate and the lower plate to be heated uniformly, controlling the heating time to be 25 minutes, starting rolling and controlling the temperature of a roller through cooling liquid, arranging a graphite isolation part in the middle of the lower plate after high-temperature and high-pressure rolling, tightly adhering and fusing the two upper plate and the lower plate together, controlling the thickness of the fused plate to be 0.9mm, and selecting the thickness of the plate by a user according to actual application.
The width of the lower plate surface is 400mm, the preheating humidity of the roller is 45 ℃, hot rolling is carried out after preheating, and the temperature of the hot roller in the hot rolling process is 50 ℃; if the width of the upper plate surface and the lower plate surface is 500mm, the preheating temperature of a hot rolling roll is 54 ℃, and the roll temperature in the normal hot rolling process is 59 ℃; rolling the plate with the width of the upper plate and the lower plate being more than 450mm at the linear speed of 300r/min, rolling the plate with the width of the upper plate and the lower plate being less than 355r/min at the linear speed of 300r/min, rolling the plate with the length being more than 1100mm and the width being less than 450mm, annealing the upper plate and the lower plate after the hot rolling, heating to 520 ℃, requiring the upper plate and the lower plate to be heated uniformly, controlling the heating time to be 27 minutes, starting the rolling and controlling the temperature of the roller through cooling liquid, arranging a graphite isolation part in the middle of the lower plate after the lower plate is rolled at high temperature and high pressure, tightly adhering and fusing the two upper plate and the lower plate together, controlling the thickness of the fused plate to be 1.5mm, and selecting the thickness of the plate by a user.
The width of the lower plate surface is 450mm, the preheating humidity of the roller is 50 ℃, hot rolling is carried out after preheating, and the temperature of the hot roller in the hot rolling process is 60 ℃; if the width of the upper plate surface and the lower plate surface is 600mm, the preheating temperature of a hot rolling roll is 48-60 ℃, and the roll temperature in the normal hot rolling process is 70 ℃; rolling the plate with the width of the upper plate and the lower plate being more than 450mm at the linear speed of 300r/min, rolling the plate with the width of the upper plate and the lower plate being less than 400r/min, rolling the plate with the length of more than 1100mm and the width of less than 450mm at the linear speed of 300r/min, annealing the upper plate and the lower plate after hot rolling, heating to 550 degrees, requiring the upper plate and the lower plate to be heated uniformly, controlling the heating time to be 30 minutes, starting rolling and controlling the temperature of a roller through cooling liquid, arranging a graphite isolation part in the middle of the lower plate after high-temperature and high-pressure rolling, tightly adhering and fusing the two upper plates and the lower plates together, controlling the thickness of the fused plate to be 2.0mm, and selecting the thickness of the plate by a user according to actual application.
f: high-temperature annealing: and e, the plate surfaces fused together in the step e are subjected to high-temperature annealing treatment due to the fact that the hardness of the plate surfaces is too high due to stress concentration in the aluminum plate, the annealing temperature is controlled to be 400-450 degrees, and the annealing time is 4 hours and the heat preservation time is 5-6 hours.
The annealing temperature is controlled at 400 ℃ through high-temperature annealing treatment, the annealing time is 4 hours, and the heat preservation time is 5 hours.
The annealing temperature is controlled at 430 ℃ through high-temperature annealing treatment, the annealing time is 4 hours, and the holding time is 5.5 hours.
The annealing temperature is controlled at 450 ℃ through high-temperature annealing treatment, the annealing time is 4 hours, and the heat preservation time is 6 hours.
g. Leveling the prying port: the pure aluminum plate is provided with an opening on the upper plate surface, the edge of the opening after the opening is not cracked or burred, the depth of the opening is 0.65-0.75mm, and the plate surface is required not to be pierced.
The depth of the opening is 0.65mm, and the opening is required not to pierce the plate surface.
The depth of the opening is 0.70mm, and the opening is required not to pierce the plate surface.
The depth of the opening is 0.75mm, and the plate surface is required not to be pierced.
h. High-pressure expansion: c, if the upper plate surface with the printing pipeline obtained from the step c still has slight printing pipelines and is not flat, the required flatness is 0.1-0.2mm, a special expansion mould is needed for high-pressure expansion correction, a 300-plus 500T oil press is selected as pressure equipment, a mould with a corresponding model is installed and connected with an air inlet pipeline to ensure that the connection sequence of air inlet, balance and exhaust pipelines is correct and has no air leakage, a circuit is connected, an expansion program and parameters are set, when the expansion is carried out, the lower plate surface of a pure aluminum plate faces downwards, a template is pressed downwards, an automatic air inlet device is started, the pressure of a main cylinder is 20MPa, the back pressure is 3-5MPa, the expansion pressure is 9-12MPa, and the template is lifted upwards after the expansion action is finished; the flatness of the expansion type can be controlled between 0.1mm and 0.2mm by adopting the process, and the improved single-side inflation pressure resistance is tested, so that the pressure can reach more than 3Mpa and can not crack for 5 minutes (the original standard is more than 2.5 Mpa).
The flatness is required to be 0.1mm, a special expansion die is required to be adopted for high-pressure expansion correction, a 300T oil press is selected as pressure equipment, the pressure of a main cylinder is 20MPa, the back pressure is 3MPa, the expansion pressure is 9MPa, and after the expansion action is finished, the template is lifted; the bulging flatness can be controlled between 0.1mm by adopting the process,
the flatness is required to be 0.15mm, a special expansion die is adopted for high-pressure expansion correction, a 400T oil press is selected as pressure equipment, the back pressure is 4MPa, the expansion pressure is 11MPa, and after the expansion action is finished, the template is lifted; the expansion flatness can be controlled between 0.15mm by adopting the process,
the flatness is required to be 0.2mm, a special expansion die is required to be adopted for high-pressure expansion correction, a 500T oil press is selected as pressure equipment, the pressure of a main cylinder is 20MPa, the back pressure is 5MPa, the expansion pressure is 12MPa, and after the expansion action is finished, the template is lifted up; the bulging flatness can be controlled between 0.1mm and 0.2mm by adopting the process,
i. drawing and shearing: and drawing a vertical right-angle line segment by drawing according to the reference of the line drawing plate, wherein the maximum error is not more than +/-2 mm. The size of the sheared workpiece meets the process requirements, the diagonal error is less than or equal to 2mm, and the sheared surface has no scratch or pit collision phenomenon.
j. Stamping: according to the corresponding integral stamping die, the stamping is that the product is close to and positioned and is stamped at one time, and the stamped product has no defects of burrs, scratches and the like.
Steel is selected to the bulging die material, and it has inlet port 3 and exhaust hole 4 to be provided with the capable intracavity of back pressure 2 and the capable intracavity processing of back pressure on the mould 1 body, and the front end processing of mould body has bulging inflation inlet 5 to be connected with the bulging press through the high-pressure gas area, and the outside in the capable chamber of back pressure is provided with seal ring groove 6.
The pressure of the selected expanding press is 9-12Mpa, the back pressure is 3-7Mpa,
the pressure of the selected expanding press is 9Mpa, and the back pressure is 3Mpa
The pressure of the selected expanding press is 11Mpa, and the back pressure is 5Mpa
The pressure of the selected expansion type press is 12Mpa, and the back pressure is selected to be 7 Mpa;
the air inlet is connected with the back pressure cavity through a pipeline, and the air outlet is connected with the back pressure cavity through a pipeline.
The high-pressure gas belt is connected with a pressure reducing valve 7 and an electromagnetic control valve 8, and the controller is electrically connected with the electromagnetic control valve.
During operation, the upper plate surface with the printing pipeline after expansion is placed in the die 1, the pure aluminum plate surface is placed downwards in the back pressure cavity 2, the air inlet pipeline and the exhaust pipeline are connected, air inlet balance is guaranteed, and no air leakage occurs when the exhaust pipeline is connected. Inputting parameters into a controller, starting an air inlet device, controlling the pressure of a main cylinder to be 20MPa, the back pressure to be 3-5MPa and the bulging pressure to be 9-12MPa, and lifting the template after the bulging action is finished; the expansion flatness can be controlled between 0.1mm and 0.2mm by adopting the process (see the left figure of figure 4). The right drawing is a double-sided blown structure. The improved single-side inflation pressure resistance is tested, and the single-side inflation pressure resistance can reach more than 3Mpa and can not crack after lasting for 5 minutes (the single-side inflation pressure resistance is not cracked after the single-side inflation pressure resistance is more than 2.5Mpa according to the original standard).
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections and can be communications between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Claims (6)
1. The utility model provides a single face roll-bond evaporator bulging die utensil and processing technology which characterized in that: the method comprises the following steps:
a. blanking;
b. roughening;
c. printing and drying;
d. riveting;
e. hot rolling at high temperature;
f. annealing at high temperature;
g. leveling the prying opening;
h. high-pressure expansion;
i. scribing and shearing;
j. stamping;
the technical proposal completes the processing and the manufacture of the single-sided roll-bond evaporator by the above 10 process steps,
a: blanking, wherein the upper plate and the lower plate are made of two different material profiles, the upper plate is made of an aluminum alloy plate, the surface of the printing pipeline is the lower plate, and a pure aluminum plate is selected;
b: roughening: b, adopting a roller-shaped roughening machine to control the surface roughness of the lower pure aluminum plate in the step a to be uniform after a Ra6.3-Ra12.5 aluminum plate is roughened visually;
c: printing and drying, namely printing the plates under the printing pipelines in the step a and the step b to manufacture the printing screen pipeline, wherein the printing screen pipeline is required to be clear, free of deformation, degumming and damage, the printing pipeline pattern is required to meet the positioning requirement, the parallelism is not more than 0.2mm, the printing pipeline is made of graphite, the graphite material of the pipeline is printed on the surface of the printed pure aluminum plywood when the graphite material is printed, and then the surface is dried at 150 degrees after being processed by 100 degrees;
d: riveting: c, combining and buckling the upper board surface with the printing pipeline and the lower board surface of the blunt aluminum board obtained in the step c, and riveting the riveting point at the edge of the tail end of the upper board surface of the printing pipeline in an area 10mm away from the board edge;
e: d, high-temperature hot hole rolling, namely hot rolling the upper plate surface and the lower plate surface which are riveted in the step d, preheating the upper plate surface and the lower plate surface before hot rolling, wherein the preheating process is to select a hot roll, the width of the riveted upper plate surface and the riveted lower plate surface is 300-450mm, the preheating humidity of the roll is 40-50 ℃, hot rolling is carried out after preheating, and the temperature of the hot roll in the hot rolling process is 45-60 ℃; annealing the upper and lower plate surfaces after hot rolling, heating to 500-550 ℃, wherein the upper and lower plate surfaces are required to be uniformly heated, the heating time is controlled to be 25-30 minutes, rolling is started, the temperature of a roller is controlled by cooling liquid, a graphite isolation part is arranged in the middle of the lower plate aluminum plate after high-temperature and high-pressure rolling, the two upper and lower plate surfaces are tightly attached and fused together, and the thickness of the fused plate surface is controlled to be 0.9-2.0 mm;
f: high-temperature annealing: c, the plate surfaces fused together in the step e are subjected to high-temperature annealing treatment due to the fact that the hardness of the plate surfaces is too high due to stress concentration inside the aluminum plate, the annealing temperature is controlled to be 400-450 degrees, the annealing time is 4 hours, and the heat preservation time is 5-6 hours;
g. leveling the prying port: opening the upper plate surface of the pure aluminum plate, wherein the edge of the opening is free of fracture and burr after opening, the depth of the opening is 0.65-0.75mm, and the plate surface is required not to be pierced;
h. high-pressure expansion: c, if the board surface with the printed pipeline obtained in the step c still has slight printed pipeline which is not flat, and the flatness is required to be 0.1-0.2mm, a special expansion mould is adopted for high-pressure expansion correction;
i. drawing and shearing: the marking-out is carried out according to the reference of the marking-out plate to mark out a vertical right-angle line segment, the maximum error is not more than +/-2 mm,
the size of the sheared workpiece meets the process requirements, the diagonal error is less than or equal to 2mm, and the sheared surface has no scratch or pit collision phenomenon;
j. stamping: according to the corresponding integral stamping die, the stamping is that the product is close to and positioned and is stamped at one time, and the stamped product has no defects of burrs, scratches and the like.
2. The expansion die and the processing technology of the single-sided roll-bond evaporator according to claim 1, characterized in that: the thickness of the plate is 1.6-3mm respectively; the tensile strength of the alloy aluminum plate is as follows: 135-165MPa, elongation > 15%, hardness requirement 30-50 (HV); 1, 75-85MPa of pure aluminum plate, more than 15% of elongation and 20-23 (HV) of hardness requirement; the error of the diagonal line of the upper plate and the lower plate is less than 1mm during blanking.
3. The expansion die and the processing technology of the single-sided roll-bond evaporator according to claim 1, characterized in that: rolling the plate surface with the width of more than 450mm of the upper and lower plate surfaces at the linear speed of 300r/min, rolling the plate surface with the width of less than 350-400r/min, rolling the plate surface with the length of more than 1100mm and the width of less than 450mm at the linear speed of 300 r/min.
4. The expansion die apparatus of a single-sided roll-bond evaporator as claimed in claim 1, wherein: steel is selected to the bloated type mould material, is provided with the back pressure on the mould body and goes the chamber and back pressure line intracavity processing has inlet port and exhaust hole, and the front end processing of mould body has the bloated type to be connected with the bloated type press through the high-pressure gas area, and the outside that the chamber was gone to the back pressure is provided with the sealed annular, the inlet port passes through the pipeline and goes the chamber with the back pressure to be connected, the exhaust hole passes through the pipeline and goes the chamber with the back pressure to be connected, be connected with relief pressure valve and solenoid electric valve on the high-pressure gas area, and solenoid electric valve passes through data line and.
5. The expansion die apparatus of a single-sided roll-bond evaporator as claimed in claim 4, wherein: the pressure of the selected expanding press is 9-12Mpa, and the back pressure is 3-7 Mpa.
6. The expansion die apparatus of a single-sided roll-bond evaporator as claimed in claim 4, wherein: placing the upper expanded plate with the printing pipeline in a mold, placing the pure aluminum plate in a back pressure cavity with the surface facing downwards, connecting an air inlet pipeline and an exhaust pipeline to ensure air inlet balance, inputting parameters into a control electromagnetic control valve by an air leakage-free electric controller when the exhaust pipeline is connected, starting an air inlet device, and lifting the template after the expansion action is completed by the main cylinder pressure of 20MPa and the back pressure of 3-5MPa and the expansion pressure of 9-12 MPa; the expansion flatness can be controlled between 0.1mm and 0.2mm by adopting the process.
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| CN201911011390.1A CN110918753A (en) | 2019-10-23 | 2019-10-23 | Expansion die for single-side blown-expansion evaporator and processing technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011390.1A CN110918753A (en) | 2019-10-23 | 2019-10-23 | Expansion die for single-side blown-expansion evaporator and processing technology |
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