Process for the wrapping of PEEK magnet wire

Abstract

The application discloses a kind of PEEK electromagnetic wire's wrapping process, it is related to wire and cable processing technical field, comprising the following specific steps: raw material preparation, conductor multi-pass wire drawing, high-frequency heating annealing, wrapping processing, high-frequency heating sintering, over constant-temperature water tank and cooling take-up, once forming processing is carried out to conductor by multi-pass wire drawing, and the target size of conductor can be quickly obtained, after the process of wrapping processing, high-frequency heating sintering and over constant-temperature water tank, PEEK strip is wrapped outside the conductor after semi-curing and step-by-step curing, first high-frequency heater and second high-frequency heater respectively heat bare conductor and conductor after wrapping insulation, conductor can be realized on-line annealing softening, and PEEK strip is tightly bonded outside the conductor after melting, so that the overall conductor insulation processing is more convenient and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire and cable processing, in particular to a PEEK electromagnetic wire wrapping process. BACKGROUND

[0002] Wire and cable are used to transmit electrical energy and magnetic energy, information and realize electromagnetic energy conversion wire products. Broadly speaking, the cable is also called cable, and the cable is defined as: a collection of the following parts; One or more insulated cores, and their respective possible cladding layers, total protective layers and outer sheaths, cables can also have additional non-insulated conductors. A layer of non-conductive material such as resin, plastic, silicone rubber, PVC, etc. is uniformly and tightly wrapped around the conductor to form an insulating layer to prevent the conductor from contacting the outside world and causing accidents such as electric shock, short circuit, etc. The wire called insulated conductor is polyether ether ketone (PEEK), which is a high polymer composed of a repeating unit containing a ketone bond and two ether bonds in the main chain structure. It is a kind of semi-crystalline polymer material. It can be used as a high-temperature structural material and an electrical insulating material, and can be compounded with glass fiber or carbon fiber to prepare reinforced materials.

[0003] In the prior art, the processing of conductor insulation mainly uses an extruder to heat the insulating material and coat the conductor, but the extrusion coating method for small size conductor insulation processing will cause the insulating layer to be not tightly combined with the conductor, and the insulating material cannot be tightly wrapped on the outside of the conductor.

[0004] In view of the above problems, the present application provides a PEEK electromagnetic wire wrapping process. SUMMARY

[0005] The purpose of the present application is to provide a PEEK electromagnetic wire wrapping process, which can quickly obtain a conductor of target size by one-step forming processing of the conductor through multi-pass wire drawing, and after the processes of wrapping, high-frequency heating sintering and constant temperature water tank, the PEEK tape is wrapped on the outside of the conductor after semi-curing and step-by-step curing. The first high-frequency heater and the second high-frequency heater heat the bare conductor and the conductor after wrapping insulation respectively, which can realize online annealing softening of the conductor and tightly bond the PEEK tape on the outside of the conductor after melting, so that the whole conductor insulation processing is more convenient and efficient, thereby solving the problems in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A PEEK electromagnetic wire wrapping process, comprising the following specific steps:

[0008] Step one: raw material preparation, select PEEK tape with thickness and width matching the target line gauge, place the PEEK tape in an environment of 100-160℃ for baking for more than 6 hours, preheat the production line oven, set the temperature in the production line oven to 350-450℃, preheat for at least 30 minutes;

[0009] Step two: multi-pass wire drawing, use multi-pass wire drawing process to form the conductor, use several groups of combined conductor drawing equipment for one forming in the multi-pass wire drawing process, select the number of groups of conductor drawing equipment according to the conductor raw material, target size of the conductor and compression amount of the single-pass conductor cross section, obtain the target size of the conductor after multi-pass wire drawing of the conductor;

[0010] Step three: high-frequency heating annealing, use the first high-frequency heater to heat the target size of the conductor obtained in step two, adjust the output power of the first high-frequency heater, detect the temperature on the conductor by the infrared temperature measuring device, set the temperature interval on the conductor to 250-350℃, and place the first high-frequency heater in the oxygen-free box body with concentrated nitrogen supply;

[0011] Step four: wrapping processing, pass the conductor with removed internal stress in step three through the wrapping machine by active traction, the active traction makes the conductor pass through the inner ring of the wrapping machine, install the PEEK tape on the wrapping head of the wrapping machine, and input the process parameters to the wrapping head;

[0012] Step five: high-frequency heating sintering, pass the wrapped wire obtained in step four through the second high-frequency heater, the second high-frequency heater is used to heat the wire again to make the PEEK tape in a molten state and uniformly adhere to the conductor, and the wire passes through the production line oven after passing through the second high-frequency heater, the number of the production line oven is 1-3;

[0013] Step six: pass through the constant temperature water tank, the wire passing through the production line oven is immersed in the constant temperature water tank for step-by-step cooling and solidification, and the constant temperature water tank is a segmented water tank;

[0014] Step seven: cooling and take-up, the target size of the conductor obtained in step two is installed on the pay-off rack for active pay-off, and the wire passes through the constant temperature water tank and is actively taken up by the take-up rack.

[0015] Further, the PEEK film in step one is selected to be a micro-transparent PEEK film material, the thickness of the film is 0.020-0.075mm, the film thickness is selected and matched according to the specific conductor size, the film modulus is ≥2000MPa, the tensile strength is ≥90MPa, and the elongation at break is ≥120%.

[0016] Further, the conductor section compression amount of the single conductor wire drawing device in step two is arranged within 12%-28%, the high-precision polycrystal die is arranged in the conductor wire drawing device, the wire drawing speed of the conductor wire drawing device is arranged within 35-90 m / min, and the wire drawing speed of the conductor wire drawing is adaptively adjusted according to the single pass section compression amount of the conductor.

[0017] Further, the process parameters in step four are specifically: the rotating speed of the wrapping head is arranged within 650-1800 r / min, the pitch of the PEEK tape on the conductor is arranged within 2-13 mm, the tension on the conductor is adjusted within 5-18 N, the number of the wrapping heads on the wrapping machine is 1-3, the wrapping lap joint rate of the PEEK tape is 10-67%, and the production line speed of the wrapping process is 2.5-11.5 m / min, and the specific production line speed needs to be adaptively adjusted with the rotating speed of the wrapping head.

[0018] Further, the temperature of the second high-frequency heater in step five is arranged within 370-420 DEG C, the first high-frequency heater in step three and the second high-frequency heater in step five are provided with an oscillation generating device, the oscillation current of the oscillation generating device is arranged within 120-240 A, and the induction frequency of the oscillation generating device is arranged within 25-45 kHz.

[0019] Further, the temperatures of the first high-frequency heater and the second high-frequency heater are adaptively adjusted according to the linear speed of the conductor and the wire passing through the first high-frequency heater and the second high-frequency heater.

[0020] Further, the segmented water tank in step six is divided into 3-4 segments, the water temperature in the segmented water tank is arranged in a step-by-step decreasing manner, the water temperature in the segmented water tank decreases step by step from the unwinding direction to the winding direction, the highest temperature in the segmented water tank is 99 DEG C, and the lowest temperature is 40 DEG C.

[0021] Compared with the prior art, the beneficial effects of the present application are as follows:

[0022] The wrapping process of the PEEK electromagnetic wire provided by the present application can process and treat the conductor through multi-pass wire drawing to quickly obtain a conductor with a target size, and after the processes of wrapping, high-frequency heating sintering and constant-temperature water tank, the PEEK tape is wrapped on the outside of the conductor through semi-curing and step-by-step curing, the first high-frequency heater and the second high-frequency heater heat the bare conductor and the conductor after insulation wrapping respectively, the conductor can be annealed and softened online, and the PEEK tape is tightly bonded to the outside of the conductor after melting, so that the whole conductor insulation process is more convenient and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a process flow diagram of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0025] Please refer to Figure 1 A PEEK electromagnetic wire wrapping process, comprising the following specific steps:

[0026] Step one: raw material preparation, selecting PEEK tape with thickness and width matching the target wire gauge, placing the PEEK tape in an environment of 100-160℃ for baking for more than 6 hours, so that the PEEK tape can obtain better softness without damaging its own structure and composition, facilitating subsequent wrapping and coating, reducing PEEK tape surface wrinkles and overlaps, and ensuring uniform wire appearance size after wrapping, preheating the production line oven, setting the temperature in the production line oven to 350-450℃, preheating for at least 30 minutes, through preheating for no less than 30 minutes, the temperature in the production line oven can be stabilized in the range of 350-450℃, and the internal temperature distribution of the production line oven is uniform;

[0027] Step two: multi-pass wire drawing of the conductor, using a multi-pass wire drawing process to form the conductor, using several groups of combined conductor drawing equipment for one forming in the multi-pass wire drawing process, reducing the process of wire drawing and improving the overall efficiency of the wire drawing process, selecting the number of groups of conductor drawing equipment according to the conductor raw material, the target size of the conductor and the compression amount of the single-pass conductor cross section, and obtaining the target size of the conductor through multi-pass wire drawing;

[0028] Step three: high-frequency heating annealing, using a first high-frequency heater to heat the target size of the conductor obtained in step two, adjusting the output power of the first high-frequency heater, detecting the temperature on the conductor through an infrared temperature measuring device, setting the temperature range on the conductor to 250-350℃, and placing the first high-frequency heater in an oxygen-free box body with concentrated nitrogen supply, reducing the oxidation reaction of the conductor with oxygen in the air after high-temperature heating, and removing the internal stress generated in the conductor wire drawing process through high-frequency heating annealing, so that the conductor is not easy to deform in the subsequent production process;

[0029] Step four: winding process, the conductor removed of internal stress in step three is passed through the winding machine by means of active traction, the conductor is actively passed through the inner ring of the winding machine by means of active traction, the PEEK tape is installed on the winding head of the winding machine, the process parameters are input to the winding head, and the winding head uniformly winds the PEEK tape on the outer side of the conductor under the action of active traction, and the insulated wrapped conductor is obtained;

[0030] Step five: high-frequency heating sintering, the wrapped conductor obtained in step four is passed through the second high-frequency heater, the second high-frequency heater is used to heat the conductor again, so that the PEEK tape is in a molten state and is uniformly adhered to the conductor, thereby realizing the effect of insulation wrapping, and the conductor passes through the production line oven after passing through the second high-frequency heater, the number of the production line oven is 1-3, and the specific number of the production line oven is adaptively selected according to the line speed of production;

[0031] Step six: passing through the constant-temperature water tank, the conductor passing through the production line oven is immersed in the constant-temperature water tank for step-by-step cooling and solidification, the speed of cooling of the conductor is slowed down to realize the effect of step-by-step solidification, and the constant-temperature water tank is a sectional water tank, and the semi-solid insulation on the outer side of the conductor is solidified and formed;

[0032] Step seven: cooling and take-up, the target-size conductor obtained in step two is actively unwound from the unwinding frame, the conductor is actively taken up by the take-up frame after passing through the constant-temperature water tank, and the tension on the conductor in the production process from step three to step seven can be kept consistent by adjusting the rotating speeds of the unwinding frame and the take-up frame.

[0033] The PEEK film in step one is selected from micro-transparent PEEK film materials, the thickness of the film is 0.020-0.075 mm, the film thickness is selected and matched according to the specific conductor size, the film modulus is greater than or equal to 2000 MPa, the tensile strength is greater than or equal to 90 MPa, and the elongation at break is greater than or equal to 120%, so that the ability of the wire to resist external force interference after winding is improved.

[0034] The conductor cross-section compression amount of the single conductor wire drawing equipment in step two is set to be within 12%-28%, the high-precision polycrystal die is arranged in the conductor wire drawing equipment, and the wire drawing speed of the conductor wire drawing equipment is set to be within 35-90 m / min, the wire drawing speed of the conductor wire drawing equipment is adaptively adjusted according to the single-pass cross-section compression amount of the conductor, so that the condition that burrs are generated on the surface of the conductor or even the whole conductor is broken due to excessive axial stress of the conductor is prevented.

[0035] The process parameters of the fourth step are as follows: the rotating speed of the wrapping head is set to be within 650-1800 r / min, the pitch of the PEEK tape on the conductor is set to be within 2-13 mm, the tension on the conductor is adjusted to be within 5-18 N, the number of the wrapping heads on the wrapping machine is 1-3, the wrapping overlap rate of the PEEK tape is 10-67%, and the production line speed during the wrapping process is 2.5-11.5 m / min, and the specific production line speed needs to be adaptively adjusted with the rotating speed of the wrapping head to meet the process requirements of the conductor tension, the number of the wrapping heads and the wrapping overlap rate.

[0036] The temperature of the second high-frequency heater in the fifth step is set to be within 370-420℃, the first high-frequency heater in the third step and the second high-frequency heater in the fifth step are provided with an oscillation generating device, the oscillation current of the oscillation generating device is set to be within 120-240 A, and the induction frequency of the oscillation generating device is set to be within 25-45 kHz.

[0037] The temperatures of the first high-frequency heater and the second high-frequency heater are adaptively adjusted according to the linear speed of the conductor and the wire passing through the first high-frequency heater and the second high-frequency heater to meet the requirements of the process design.

[0038] The sectional water tank in the sixth step is divided into 3-4 sections, the water temperature in the sectional water tank is set to be gradually decreased, the semi-cured insulation on the outer side of the wire can be gradually cured, the cured insulation has uniform texture, the water temperature in the sectional water tank gradually decreases from the wire unwinding direction to the wire winding direction, the highest temperature in the sectional water tank is 99℃, and the lowest temperature is 40℃, the temperature intervals of each section in the sectional water tank are cooled and watered by circulating water to keep the temperature in the water tank stable, and the number of the sectional water tanks is determined according to the specific speed of the wire unwinding and winding and the quality appearance of the final product.

[0039] It should be noted that, in the present text, the relational terms such as first and second and the like are used merely to differentiate one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0040] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A wrapping process for PEEK electromagnetic wire, characterized by: The specific steps include: Step 1: Prepare the raw materials. Select PEEK strips with thickness and width that match the target wire gauge. Bake the PEEK strips at 100-160°C for more than 6 hours. Preheat the production line oven. Set the oven temperature at 350-450°C for at least 30 minutes. Step 2: Conductor multi-pass wire drawing, using a multi-pass wire drawing process to draw and form the conductor, the multi-pass wire drawing process uses several groups of conductor wire drawing equipment combined together to perform one-time forming, the number of conductor wire drawing equipment groups is selected according to the conductor raw material, the target size of the conductor and the compression amount of the conductor cross section in a single pass, the conductor is subjected to multi-pass wire drawing to obtain a conductor of target size, the conductor cross section compression amount of a single conductor wire drawing equipment is set within 12%-28%, a high-precision polycrystalline die is provided in the conductor wire drawing equipment, the conductor wire drawing speed in the conductor wire drawing equipment is set within 35-90m / min, and the conductor wire drawing speed is adaptively adjusted according to the cross section compression amount of the conductor in a single pass; Step 3: High-frequency heating annealing: The conductor of the target size obtained in step 2 is subjected to high-frequency heating using a first high-frequency heater. The output power of the first high-frequency heater is adjusted, and the temperature of the conductor is detected by an infrared temperature measuring device. The temperature range of the conductor is set to 250-350°C. The first high-frequency heater is placed in an oxygen-free box with a centralized nitrogen supply. Step 4: Wrapping process: The conductor with internal stress removed in step 3 is passed through the wrapping machine by active pulling. The conductor is actively pulled through the inner ring of the wrapping machine, and the PEEK strip is installed on the wrapping head of the wrapping machine. The process parameters are input to the wrapping head. Step 5: high-frequency heating and sintering. The wrapped wire obtained in step 4 is passed through a second high-frequency heater. The second high-frequency heater is used to heat the wire again so that the PEEK tape is in a molten state and evenly adheres to the conductor. After passing through the second high-frequency heater, the wire passes through the production line oven. The number of production line ovens is 1-3. The temperature of the second high-frequency heater is set within 370-420°C. The first high-frequency heater in step 3 and the second high-frequency heater in step 5 are provided with an oscillation generating device. The oscillation current of the oscillation generating device is set within 120-240A, and the induction frequency of the oscillation generating device is set within 25-45kHz. The temperature of the first high-frequency heater and the second high-frequency heater is adaptively adjusted according to the linear speed of the conductor and the wire passing through the first high-frequency heater and the second high-frequency heater; Step 6: Pass through the constant temperature water tank, and immerse the wire through the production line oven into the constant temperature water tank for step-by-step cooling and curing. The constant temperature water tank is a segmented water tank; Step 7: Cooling and winding. The target size conductor obtained in step 2 is installed on the wire pay-off frame for active wire pay-off. The conductor passes through the constant temperature water tank and then is actively wound through the wire take-up frame.

2. The wrapping process of PEEK magnet wire according to claim 1, characterized in that: The PEEK film described in step 1 is made of slightly transparent PEEK film material, wherein the thickness of the film is 0.020-0.075 mm. The film thickness is selected and matched according to the specific conductor size. The film modulus is ≥2000 MPa, the tensile strength is ≥90 MPa, and the elongation at break is ≥120%.

3. The wrapping process of the PEEK electromagnetic wire according to claim 1, characterized in that: The specific process parameters in step 4 are as follows: the rotation speed of the wrapping head is set within 650-1800r / min, the pitch of the wrapped PEEK tape on the conductor is set within 2-13mm, the tension adjustment range on the conductor is 5-18N, the number of wrapping heads on the wrapping machine is 1-3, the wrapping overlap rate of the PEEK tape is 10-67%, and the production line speed of the wrapping process is 2.5-11.5m / min. The specific production line speed needs to be adaptively adjusted with the rotation speed of the wrapping head.

4. The wrapping process of the PEEK magnet wire according to claim 1, characterized in that: The segmented water tank in step six is ​​divided into 3-4 sections. The water temperature in the segmented water tank is set to decrease step by step. The water temperature in the segmented water tank decreases step by step from the line-paying direction to the line-reeling direction. The highest temperature in the segmented water tank is 99°C and the lowest is 40°C.

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