阅读说明：本技术 耐蚀铜毛细管及其连续加工工艺 (Corrosion-resistant copper capillary and continuous processing technology thereof ) 是由 周彬 薛晓伟 方林珍 王波 项苏祺 滕世政 占利华 于 2021-07-30 设计创作，主要内容包括：本发明公开一种耐蚀铜毛细管及其连续加工工艺,其特征是其表面具有致密封闭层,在致密封闭层中设有微型花纹,并在致密封闭层和微型花纹上面设有镀膜结合层,镀膜结合层外部设有镀膜封闭层；通过硬化封闭、滚花、预热、镀膜、非接触环压以及高频固化等工序实现。完全满足任意长度铜毛细管表面耐蚀层处理要求,均匀稳定、强有力的附着力,全面覆盖管体表面,避免管体使用过程中产生氧化层、发生锈蚀或产生电位差引起电化学腐蚀,整个生产过程无化学污染,节能环保,成型自然,流水线效率高。(The invention discloses an anti-corrosion copper capillary tube and a continuous processing technology thereof, which are characterized in that the surface of the anti-corrosion copper capillary tube is provided with a compact sealing layer, a micro pattern is arranged in the compact sealing layer, a coating binding layer is arranged on the compact sealing layer and the micro pattern, and the coating sealing layer is arranged outside the coating binding layer; the method is realized through the procedures of hardening and sealing, knurling, preheating, coating, non-contact ring pressing, high-frequency curing and the like. The process completely meets the treatment requirement of the corrosion-resistant layer on the surface of the copper capillary tube with any length, has uniform, stable and powerful adhesive force, completely covers the surface of the tube body, avoids the electrochemical corrosion caused by the generation of an oxide layer, corrosion or potential difference in the use process of the tube body, has no chemical pollution in the whole production process, is energy-saving and environment-friendly, is natural in forming and has high assembly line efficiency.)

1. The corrosion-resistant copper capillary tube (10) is characterized in that the surface of the corrosion-resistant copper capillary tube is provided with a compact sealing layer (101), micro patterns are arranged in the compact sealing layer, a coating combining layer (103) is arranged on the compact sealing layer and the micro patterns, and a coating sealing layer (102) is arranged outside the coating combining layer.

2. The corrosion-resistant copper capillary tube of claim 1, wherein the micro-patterns are irregular helical striations.

3. The corrosion-resistant copper capillary tube of claim 1, wherein the micro-pattern has a depth of 0.003-0.005 mm.

4. A continuous processing technology of a corrosion-resistant copper capillary is characterized by comprising the following steps:

(1) discharging;

(2) hardening and sealing: carrying out grain refinement on the surface layer of the copper capillary by a physical method;

(3) knurling: obtaining fine patterns in the hardened sealing layer by a physical method;

(4) preheating: uniformly heating by a hot air box at 80 ℃;

(5) film coating: forming a coating combining layer (103) which is tightly combined with the surface of the tube wall on the surface of the copper capillary tube (10);

(6) non-contact ring pressing: trimming the thickness of the coating bonding layer through an air ring with controllable air pressure;

(7) high-frequency curing;

(8) cooling;

(9) and (6) receiving materials.

5. The continuous process of claim 4, wherein the hardening and sealing in step 2 is performed by passing the copper capillary through a polycrystalline mold having an aperture in interference fit with the outer diameter of the copper capillary blank to plastically deform the surface layer of the copper capillary.

6. The continuous processing technique of corrosion-resistant copper capillary tube according to claim 4, wherein the knurling in step 3 is based on the center line of the copper capillary tube (10), a pair of hard alloy brush wheels (20) are symmetrically arranged, and the surface of the copper capillary tube is processed by fine patterns.

7. The continuous process for machining a corrosion-resistant copper capillary according to claim 6, wherein the pair of cemented carbide brush wheels (20) simultaneously rotate while revolving along the center line of the copper capillary (10).

8. The continuous processing technology of the corrosion-resistant copper capillary tube as claimed in claim 7, wherein the advancing speed of the copper capillary tube (10) is upsilon, the revolution speed of the pair of brush wheels (20) along the copper capillary tube is 2 upsilon, and the rotation speed of the brush wheels is 5 upsilon.

9. The continuous process for fabricating corrosion-resistant copper capillary according to claim 4, wherein in step 5, the coating bonding layer (103) is made of polyurethane paint with a thickness of 0.025 mm.

10. The continuous process for producing a corrosion-resistant copper capillary according to claim 4, wherein in step 6, the copper capillary is pulled vertically upward while the air ring is uniformly blown.

Technical Field

The invention relates to a manufacturing technology of a micro-diameter tube, in particular to a corrosion-resistant copper capillary tube and a continuous processing technology thereof.

Background

At present, the surface protection treatment of the copper pipe mainly comprises three methods: firstly, a sheath is adopted, wherein the length of the sheath is short, the cost is too high when the sheath is added on a pipe body with infinite length, for example, the patent publication number is CN103470916A, a copper-aluminum welding spot protection structure and a protection method are that the outer surface of the copper-aluminum welding spot of a copper pipe and an aluminum pipe is coated with the protection sheath, the protection sheath is of a double-layer structure, the outer layer is made of a heat-shrinkable material, and the inner layer is made of a hot-melt material; according to this concept, for copper capillaries of greater length, it is common to add a layer of heat shrink or aluminum foil tape to the tube body to prevent it from contacting other refrigeration circuits, but this solution still leaves a portion of the tube body exposed to air or to the foam layer. Secondly, by adopting an alloy formula, as is well known, once the physical properties of an alloy pipe body are changed, for example, the patent publication number is CN104911390A, an antibacterial corrosion-resistant heat exchanger copper pipe comprises the following raw material components: 1-2 parts of antimony, 2-3 parts of silicon, 1-2 parts of arsenic, 2-4 parts of zirconium, 1-2 parts of yttrium, 2-3 parts of barium, 3-5 parts of iron, 2-3 parts of cobalt, 2-3 parts of boron, 80-100 parts of copper and inevitable impurities. Thirdly, the chemical treatment and coating are carried out on the surface of the tube, which not only has the problems of pollution and the like, but also has longer process time and is not suitable for the surface treatment of the capillary tube, for example, the copper tube surface anti-corrosion treatment process provided by the patent publication No. CN107904586A comprises the following steps: degreasing, electrolytically degreasing and activating to prepare a potassium persulfate solution, adding clean water and potassium persulfate into a water tank, then adding a proper amount of NaOH, and adjusting the pH value to 12-14 and the concentration of the potassium persulfate to 10-12 g/L; generating an oxidation film, dehydrating, drying and painting.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, an oxidation layer is generated in the use process due to the lack of anticorrosion measures for the surface of a capillary tube with a long length or only a single-layer structure of a copper capillary tube blank is contacted with the atmosphere or a foaming layer and is corroded under severe conditions, so that the copper capillary tube is gradually disabled, and simultaneously, the copper capillary tube is contacted with an air return pipe or other refrigerating pipes to generate potential difference to cause electrochemical corrosion and the like.

The technical problem of the invention is mainly solved by the following technical scheme: the corrosion-resistant copper capillary tube is characterized in that the surface of the corrosion-resistant copper capillary tube is provided with a compact sealing layer, micro patterns are arranged in the compact sealing layer, a coating combining layer is arranged on the compact sealing layer and the micro patterns, and a coating sealing layer is arranged outside the coating combining layer.

In the corrosion-resistant copper capillary tube, the micro-patterns are preferably irregular helical stripes.

In the corrosion-resistant copper capillary, preferably, the micro pattern has a depth of 0.003 to 0.005 mm.

A continuous processing technology of a corrosion-resistant copper capillary is characterized by comprising the following steps:

(1) and (5) discharging.

(2) Hardening and sealing: and refining the grains of the surface layer of the copper capillary tube by a physical method.

(3) Knurling: a fine pattern is obtained in the hardened seal by physical means.

(4) Preheating: heating in 80 deg.C hot air oven.

(5) Film coating: and forming a coating combining layer tightly combined with the surface of the tube wall on the surface of the copper capillary tube.

(6) Non-contact ring pressing: and trimming the thickness of the coating bonding layer through an air ring with controllable air pressure.

(7) And (4) high-frequency curing.

(8) And (6) cooling.

(9) And (6) receiving materials.

In the aforementioned continuous processing technology of the corrosion-resistant copper capillary, preferably, the hardening and sealing in step 2 is to make the surface layer of the copper capillary plastically deform by passing the copper capillary through a polycrystalline mold with an aperture in interference fit with the outer diameter of the copper capillary blank.

In the continuous processing process of the corrosion-resistant copper capillary, preferably, the knurling in the step 3 is to symmetrically arrange a pair of hard alloy brush wheels based on the center line of the copper capillary, and perform fine pattern processing on the surface of the copper capillary.

In the aforementioned continuous process for machining a corrosion-resistant copper capillary, preferably, the pair of cemented carbide brush wheels simultaneously rotate while revolving along the center line of the copper capillary.

In the above continuous processing process for the corrosion-resistant copper capillary, preferably, when the advancing speed of the copper capillary is upsilon, the revolution speed of the pair of brush wheels along the copper capillary is 2 upsilon, and the rotation speed of the brush wheels is 5 upsilon.

In the aforementioned continuous processing process of the corrosion-resistant copper capillary, preferably, in step 5, the material of the coating bonding layer is polyurethane paint, and the thickness of the coating bonding layer is 0.025 mm.

In the above-described continuous processing process for a corrosion-resistant copper capillary, preferably, in step 6, the copper capillary is pulled vertically upward while the air ring is uniformly blown.

The copper capillary in the technical scheme is observed from a microscopic angle, and the surface of the copper capillary actually mainly comprises two layers: namely a compact sealing layer and a coating layer. The process designs a physical plastic deformation means to uniformly refine grains on the surface of the copper capillary tube, so that a compact 'film' is formed on the surface of the copper capillary tube, the strength, hardness and surface roughness precision of the film are greatly higher than those of the original copper tube body, and the 'film' cannot solve the problem of electrochemical corrosion and needs to be protected by a coating layer.

Then, micro patterns which are manufactured by a pure physical method are designed on the smooth and relatively hard surface, the micro patterns are irregular spiral line stripes, and can provide support for the force of an attached person in any direction on the surface of the cambered surface pipe body, so that the contact area of the coating layer and the surface of the copper pipe is increased, the binding force of the coating layer is improved, the coating layer and the capillary pipe body have the fusion of mutual permeation, and the intersection relation between two objects with different properties is thoroughly changed.

Moreover, because the conventional coating layer can not greatly prolong the service life of the surface of the coating layer, the process designs a pure physical method again, namely under the premise of not changing the chemical properties of the material, the physical properties of the surface of the coating layer are changed, the organization structure of the coating layer is refined, a coating closed layer structure in the true protection meaning is formed, and the coating closed layer structure has strong binding force, high corrosion resistance and insulating property, can be directly contacted with an aluminum pipe, a steel pipe and the like in a refrigeration pipeline, and does not generate electrochemical corrosion. The high-frequency heating can efficiently and quickly generate heat, so that the energy consumption can be saved, and the heating distance can be shortened; the metal pipe heating device can heat a metal pipe, dry a paint film from inside to outside, avoid the phenomenon that the inside of the surface of the paint film material is dried but not dried completely to generate bubbles, and also ensure that the paint film is not damaged due to the fact that the paint film is not dried completely when passing through the guide wheel.

The continuous processing technology in the scheme has strong practicability, accords with the execution of general manufacturing enterprises, and is ingenious in design of devices from discharging to feeding, particularly the polycrystalline die and the hard alloy brush wheel, and meets the requirements of plastic deformation and fine grain formation of the surface layer of the copper capillary tube. In detail, a revolution and rotation running mode is also designed, the hard alloy brush wheel is composed of a plurality of irregularly arranged alloy wires, the formed lines are disordered spiral lines, and the fine lines formed on the surface of the copper capillary tube advancing at a constant speed by the spiral lines are basically continuous, so that the coating spreading pad has special adhesion forces such as continuity, multiple angles, entanglement and entanglement.

In addition, the scheme enables the density degree of the surface grains of the capillary tube to be optimal through reasonable adaptation of the advancing speed of the workpiece and the revolution-rotation speed of the knurled brush wheel, and avoids the problem of binding force reduction caused by too small or too small density. The copper capillary tube is vertically and upwards pulled in the air ring uniform blowing process, the gravilogy and annular pneumatic principle are met, and the final uniform effect of the coating is ensured.

Compared with the prior art, the invention has the beneficial effects that: the process completely meets the treatment requirement of the corrosion-resistant layer on the surface of the copper capillary tube with any length, has uniform, stable and powerful adhesive force, completely covers the surface of the tube body, avoids the electrochemical corrosion caused by the generation of an oxide layer, corrosion or potential difference in the use process of the tube body, has no chemical pollution in the whole production process, is energy-saving and environment-friendly, is natural in forming and has high assembly line efficiency.

Drawings

Fig. 1 is a schematic structural view of a copper capillary product of the present invention.

Fig. 2 is a schematic view of a part of the enlarged structure at M in fig. 1.

Fig. 3 is a process flow diagram of the present invention.

FIG. 4 is a schematic diagram of a process equipment arrangement of the present invention.

Fig. 5 is a schematic view of a knurled state of the present invention.

Fig. 6 is a schematic representation of a micro-pattern of the present invention.

In the figure: 10. 101 parts of a copper capillary tube, 101 parts of a compact sealing layer, 102 parts of a coating sealing layer, 103 parts of a coating combining layer and 20 parts of a brush wheel.

The process comprises the following steps: 1. discharging; 2. hardening and sealing; 3. knurling; 4. preheating hot air; 5. coating; 6. non-contact ring pressing; 7. high-frequency curing; 8. cooling; 9. and (6) receiving materials.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Referring to fig. 1 and 2, the corrosion-resistant copper capillary 10 of the present embodiment has three layers from inside to outside on the surface of the tube wall body: a dense sealing layer 101, a plating bonding layer 103 and a plating sealing layer 102.

In terms of microstructure, the compact sealing layer 101 is provided with micro-patterns, the micro-patterns are irregular spiral line stripes, the depth of the micro-patterns is 0.003-0.005mm, a coating combining layer 103 is arranged on the compact sealing layer 101 and the micro-patterns, and the coating sealing layer 102 is arranged outside the coating combining layer 103.

A continuous process for corrosion-resistant copper capillary tube, as shown in fig. 3 and 4, comprising the following steps:

1. discharging: and (3) guiding the copper capillary tube blank on the winding drum into a production line according to the production line speed upsilon.

2. Hardening and sealing: and refining the grains of the surface layer of the copper capillary tube by a physical method. The specific measure is that the copper capillary blank passes through a polycrystalline die with the aperture in interference fit with the outer diameter of the copper capillary blank, so that the surface layer of the copper capillary blank is extruded to generate plastic deformation.

3. Knurling: a fine pattern is obtained in the hardened seal by physical means. Specifically, a pair of hard alloy brush wheels 20 are symmetrically arranged on the basis of the center line of the copper capillary tube 10, as shown in fig. 5, a group of irregularly arranged alloy wires are arranged on the brush wheels 20, and the pair of hard alloy brush wheels 20 simultaneously keep rotating on the premise of revolving around the center line of the copper capillary tube 10. Wherein, the revolution speed of the brush wheel 20 along the copper capillary tube 10 is 2 upsilon, and the rotation speed of the brush wheel is 5 upsilon. The copper capillary surface was thus subjected to a fine patterning process to form irregular continuous helical streaks, as shown in fig. 6.

4. Preheating: heating in 80 deg.C hot air oven.

5. Film coating: a coating bonding layer 103 which is tightly bonded with the surface of the tube wall is formed on the surface of the copper capillary tube 10, the coating bonding layer 103 is made of polyurethane paint, and the thickness of the film is 0.025 mm.

6. Non-contact ring pressing: the thickness of the plating film bonding layer 103 is trimmed by a gas ring with controllable gas pressure. The copper capillary is vertically and upwards pulled, constant-pressure gas is blown out from the gas ring when the coating combination layer 103 is still in a soft state, the gas is synchronously blown from the copper capillary 10 for one circle, the blowing direction and the advancing direction of the copper capillary 10 form an acute angle, the gas pressure is 0.4-0.6M Pa, the continuous blowing enables the thickness of the coating combination layer 103 on the surface of the output tube to be uniform, and meanwhile, the coating combination layer 103 is pressed to enable the coating combination layer to be attached to the compact sealing layer 101 with fine patterns.

7. High-frequency curing: namely high-frequency induction heating curing, the heating temperature is 520-550 ℃.

8. And (3) cooling: and cooling to normal temperature.

9. And (6) receiving materials.

According to the process principle of the embodiment, the scheme is suitable for the surface corrosion-resistant treatment of the capillary tube with the diameter less than or equal to 4mm, is also suitable for the surface treatment of a large-diameter tube, is suitable for the surface treatment of a copper tube body, is also suitable for the surface treatment of a protective layer of the tube body made of aluminum, alloy materials and the like, and can be used as long as the surface hardness is lower than that of the alloy wire of the hard alloy brush wheel 20.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modified structures, processes, and the like of the present invention are within the scope of the present invention.