Surface treatment method for smooth wrapped cable for aviation

Abstract

The invention belongs to the technical field of cable production and processing, and discloses a surface treatment method of a smooth wrapped cable for aviation, which comprises the following steps of: 1, firstly, adopting a PI / PTFE (Polytetrafluoroethylene) composite belt on the inner layer of a cable conductor, optimally adopting 50.8%-51.5% of wrapping lap joint, adopting a PTFE special-shaped belt to wrap the outer layer, adopting a wrapping belt with the thickness of 0.07 mm, adopting 50.8%-51.3% of lap joint, adopting a three-roll-shaft die to tightly press in the same direction after the wrapping is completed, and adopting a three-roll-shaft die to tightly press in the same direction; and the pressing outer diameter is 0.1-0.2 mm smaller than the wrapping outer diameter. In the cable wrapping process, surface pretreatment is carried out, then high-temperature grinding secondary treatment is carried out, and then the wrapped cable is coated with the PTFE insulating layer, so that the surface of the cable is smoother, the surface smoothness is reduced to 10% or below, the seamless effect can be achieved, meanwhile, the insulating thickness of the surface of the wire is increased, the cable is more wear-resistant and pressure-resistant in the machining process, and the service life of the cable is prolonged. The service life of the cable is effectively prolonged, the durable effect of the cable is effectively improved, and if friction is generated between the cable and other metal materials, the situation that the surface of the cable is damaged can also be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of cable production and processing, and specifically relates to a surface treatment method for a smooth wrapped cable for aviation. Background Art

[0002] The structure of aviation smooth wrapped cables generally includes inner conductor, polyimide composite tape insulation layer, X-ETFE raw tape insulation layer or (inner conductor, polyimide composite tape insulation layer, X-ETFE raw tape insulation layer, outer conductor, and sheath tape layer wrapped around the outer conductor) from the inside to the outside.

[0003] Ordinary aviation wrapped cables may have uneven overlapping parts on their surface after wrapping. This type of cable will often cause surface damage and poor voltage resistance due to large friction between the surface and other metal materials during the processing and wiring process. Through continuous testing and research, it was finally determined that the influence of friction can be eliminated when the surface smoothness of the wrapped cable is less than 10%. However, smooth wrapped cables for aviation use are extremely difficult to produce, and have been a problem in the industry, so they need to be improved. Summary of the invention

[0004] The object of the present invention is to provide a surface treatment method for a smooth wrapped cable for aviation use, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a surface treatment method of a smooth wrapped cable for aviation, comprising the following steps: Step 1: First, the inner layer of the cable conductor is made of PI / PTFE composite tape, and the best overlap is 50.8% to 51.5%. The outer layer is wrapped with PTFE special-shaped tape, the thickness of the wrapping tape is 0.07mm, and the overlap is 50.8% to 51.3%. After wrapping, a three-roller die is used to press in the same direction, and the pressing outer diameter is 0.1 to 0.2mm smaller than the wrapping outer diameter; Step 2: After the outer layer of the cable is wrapped, a roller pretreatment is first performed to make the inside of the cable tighter to avoid looseness. After the cable pretreatment is completed, the cable is subjected to a secondary surface high-temperature grinding treatment. The cable grinding preheating temperature is 180℃~200℃, and then aramid fiber is used for rotary grinding. The grinding and winding speed is 10m / min; Step 3: The ground cable is treated with impregnation, sintering and curing. After the secondary treatment of the outer tape of the cable is completed, a layer of insulating PTFE layer is evenly coated on the cable surface with PTFE emulsion during the cable winding process. The cable is then placed in a high-temperature sintering furnace and sintered and cured at a temperature of 380-400°C and a speed of 10m / min, which will eventually form a smooth surface for the cable.

[0006] The processing method of the present invention uses a copper conductor as a cable core, and the copper conductor is sequentially wrapped by an insulating layer, a ceramic fiber, a wrapping tape, an interlocking sheath and a sheath from an inner layer to an outer layer. The copper conductor is a copper conductor that has been twisted by wire drawing. The present invention uses a copper conductor as a cable core and uses a metal interlocking sheath to form a dense metal protective sheath, which can improve the flame retardant performance of the cable.

[0007] Preferably, the thickness of the insulating PTFE layer described in step three is 1 to 1.5 um, and the line speed of the cable sintering and winding is 10 to 15 m / min. Due to the design of the insulating PTFE layer, a good insulation protection effect can be achieved for the cable.

[0008] Preferably, the PTFE emulsion described in step three has a density of 1.51, a curing amount of 60%, a pH value of 10, and a curing temperature of 350°C. The requirements for the use standard of PTFE emulsion will enable the cable to have a good insulation effect in the future, while also ensuring the production and processing quality of the cable.

[0009] Preferably, the roller press needs to be lubricated and maintained before the rolling pretreatment described in step 2, and the cable rolling quality needs to be checked immediately after the rolling pretreatment. By lubricating and maintaining the roller press, the smooth cable rolling operation can be guaranteed. At the same time, when the cable is checked immediately after rolling, quality problems at the beginning of cable rolling can be avoided, thereby reducing the defective rate of subsequent production.

[0010] Preferably, the PTFE emulsion described in step three should be applied in a dust-free working environment, and the storage temperature of the PTFE emulsion is 10-30°C, so that the PTFE emulsion will not be disturbed by dust when applied to the outer surface of the cable, thereby ensuring the quality of cable production. The storage temperature requirement of the PTFE emulsion can avoid the solidification of the PTFE emulsion, thereby ensuring that the PTFE emulsion can be used normally later.

[0011] Preferably, the cable surface needs to be cleaned of dust before the cable impregnation, sintering and curing treatment described in step three. This design can remove dust on the outer surface of the cable, thereby preventing the dust from affecting subsequent processing of the cable.

[0012] Preferably, the high-temperature sintering furnace described in step three is slowly heated up, and the high-temperature sintering furnace needs to pay attention to its internal pressure at all times during the heating operation. When the cable is slowly heated up inside the high-temperature sintering furnace, this can help the insulating PTFE layer to solidify on the cable surface. At the same time, paying attention to the internal pressure of the high-temperature sintering furnace can ensure that the cable has a good sintering environment.

[0013] Preferably, the aramid fiber described in step three is composed of multiple strands, and the multiple strands of aramid fiber are rotated in the same direction. This treatment method can fully and evenly grind the outer surface of the cable, thereby ensuring the initial smooth effect of the outer surface of the cable.

[0014] Preferably, the PTFE composite tape described in step 1 is thick in the middle and thin on both sides, and has a special-shaped structure. The thickest part in the middle of the PTFE composite tape is 0.07 μm.

[0015] Standard requirements for PTFE composite tapes can better produce high-quality cables.

[0016] The beneficial effects of the present invention are as follows: The present invention performs surface pretreatment during the cable wrapping process, then performs high-temperature grinding secondary treatment, and then coats the wrapped cable with a PTFE insulation layer to make the cable surface smoother, and the surface smoothness is reduced to less than 10%, thereby achieving a seamless effect and increasing the insulation thickness on the wire surface, thereby making the cable more wear-resistant and pressure-resistant during the processing process, effectively improving the service life and durability of the cable, and if the cable rubs against other metal materials, it will also avoid damage to the cable surface. DETAILED DESCRIPTION

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0018] An embodiment of the present invention provides a surface treatment method for a smooth wrapped cable for aviation, comprising the following steps: Step 1: First, the inner layer of the cable conductor is made of PI / PTFE composite tape, and the best overlap is 50.8% to 51.5%. The outer layer is wrapped with PTFE special-shaped tape, the thickness of the wrapping tape is 0.07mm, and the overlap is 50.8% to 51.3%. After wrapping, a three-roller die is used to press in the same direction, and the pressing outer diameter is 0.1 to 0.2mm smaller than the wrapping outer diameter; Step 2: After the outer layer of the cable is wrapped, a roller pretreatment is first performed to make the inside of the cable tighter to avoid looseness. After the cable pretreatment is completed, the cable is subjected to a secondary surface high-temperature grinding treatment. The cable grinding preheating temperature is 180℃~200℃, and then aramid fiber is used for rotary grinding. The grinding and winding speed is 10m / min; Step 3: The ground cable is treated with impregnation, sintering and curing. After the secondary treatment of the outer tape of the cable is completed, a layer of insulating PTFE layer is evenly coated on the cable surface with PTFE emulsion during the cable winding process. The cable is then placed in a high-temperature sintering furnace and sintered and cured at a temperature of 380-400°C and a speed of 10m / min, which will eventually form a smooth surface for the cable.

[0019] During the cable wrapping process, the cable surface is pretreated and then subjected to secondary high-temperature grinding treatment. Finally, a PTFE insulation layer is coated on the wrapped cable to make the cable surface smoother and the surface smoothness is reduced to less than 10%, achieving a seamless effect. At the same time, the insulation thickness of the wire surface is increased, making the cable more wear-resistant and pressure-resistant during the processing.

[0020] Among them, the thickness of the insulating PTFE layer in step three is 1 to 1.5 um, and the line speed of the cable sintering and winding is 10 to 15 m / min.

[0021] In this way, due to the design of the insulating PTFE layer, a good insulation protection effect can be achieved for the cable.

[0022] Among them, the PTFE emulsion in step three has a density of 1.51, a curing amount of 60%, a pH value of 10, and a curing temperature of 350°C.

[0023] The requirements for the use of PTFE emulsion standards will ensure that the cable has good insulation effect in the future, while also ensuring the production and processing quality of the cable.

[0024] Among them, the roller press needs to be lubricated and maintained before the roller pressing pretreatment in step 2, and the cable rolling quality needs to be checked immediately after the roller pressing pretreatment.

[0025] By lubricating and maintaining the roller press, the cable rolling operation can be guaranteed to proceed smoothly. At the same time, the cable should be inspected immediately after rolling to avoid quality problems at the beginning of cable rolling, thereby reducing the defective rate in subsequent production.

[0026] The PTFE emulsion in step three should be applied in a dust-free working environment, and the storage temperature of the PTFE emulsion is 10-30°C.

[0027] This ensures that the PTFE emulsion will not be disturbed by dust when it is coated on the outer surface of the cable, thereby ensuring the quality of cable production. The storage temperature requirement for the PTFE emulsion can avoid the solidification of the PTFE emulsion and ensure the subsequent normal use of the PTFE emulsion.

[0028] Among them, before the cable impregnation, sintering and curing treatment in step three, the cable surface needs to be cleaned of dust.

[0029] Such a design can remove dust from the outer surface of the cable, thereby preventing the dust from affecting subsequent processing of the cable.

[0030] The high temperature sintering furnace in step three is heated up slowly, and the internal pressure of the high temperature sintering furnace needs to be paid attention to at all times during the heating operation.

[0031] When the cable is slowly heated up inside the high-temperature sintering furnace, this can help the insulating PTFE layer to solidify on the cable surface. At the same time, attention to the internal pressure of the high-temperature sintering furnace can ensure that the cable has a good sintering environment.

[0032] Wherein, the aramid fibers in step three are multiple strands, and the multiple strands of aramid fibers are rotated in the same direction.

[0033] This treatment method can fully and evenly grind the outer surface of the cable, thereby ensuring the initial smooth effect of the outer surface of the cable.

[0034] Among them, the PTFE composite tape in step one is thick in the middle and thin on both sides, and has a special-shaped structure. The thickest part in the middle of the PTFE composite tape is 0.07 μm.

[0035] Standard requirements for PTFE composite tapes can better produce high-quality cables.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for surface treatment of a smooth wrapped cable for aviation, characterized in that: The following steps are involved: Step 1: First, the inner layer of the cable conductor is made of PI / PTFE composite tape, and the best overlap is 50.8% to 51.5%. The outer layer is wrapped with PTFE special-shaped tape, the thickness of the wrapping tape is 0.07mm, and the overlap is 50.8% to 51.3%. After wrapping, a three-roller die is used to press in the same direction, and the pressing outer diameter is 0.1 to 0.2mm smaller than the wrapping outer diameter; Step 2: After the outer layer of the cable is wrapped, a roller pretreatment is first performed to make the inside of the cable tighter to avoid looseness. After the cable pretreatment is completed, the cable is subjected to a secondary surface high-temperature grinding treatment. The cable grinding preheating temperature is 180℃~200℃, and then aramid fiber is used for rotary grinding. The grinding and winding speed is 10m / min; Step 3: The ground cable is treated with impregnation, sintering and curing. After the secondary treatment of the outer tape of the cable is completed, a layer of insulating PTFE layer is evenly coated on the cable surface with PTFE emulsion during the cable winding process. The cable is then placed in a high-temperature sintering furnace and sintered and cured at a temperature of 380-400°C and a speed of 10m / min, which will eventually form a smooth surface for the cable.

2. The surface treatment method of a smooth wrapped cable for aviation according to claim 1, characterized in that: The thickness of the insulating PTFE layer described in step three is 1 to 1.5 um, and the line speed of the cable sintering and winding is 10 to 15 m / min.

3. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: The PTFE emulsion described in step 3 has a density of 1.51, a curing amount of 60%, a pH value of 10, and a curing temperature of 350°C.

4. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: Before the rolling pretreatment described in step 2, the rolling machine needs to be lubricated and maintained, and after the rolling pretreatment, the cable rolling quality needs to be checked immediately.

5. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: The PTFE emulsion described in step 3 should be applied in a dust-free working environment, and the storage temperature of the PTFE emulsion is 10-30°C.

6. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: Before the cable impregnation, sintering and curing treatment described in step 3, the cable surface needs to be cleaned of dust.

7. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: The high temperature sintering furnace described in step three is slowly heated up, and the internal pressure of the high temperature sintering furnace needs to be paid attention to at all times during the heating operation.

8. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: The aramid fiber described in step three is provided in multiple strands, and the multiple strands of aramid fiber are rotated in the same direction.

9. The surface treatment method of a smooth wrapped cable for aviation use according to claim 1, characterized in that: The PTFE composite tape described in step 1 is thick in the middle and thin on both sides, and has a special-shaped structure. The thickest part in the middle of the PTFE composite tape is 0.07 μm.