CN219923512U - Coating system of titanium alloy wire surface lubricating coating - Google Patents
Coating system of titanium alloy wire surface lubricating coating Download PDFInfo
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- CN219923512U CN219923512U CN202223415347.1U CN202223415347U CN219923512U CN 219923512 U CN219923512 U CN 219923512U CN 202223415347 U CN202223415347 U CN 202223415347U CN 219923512 U CN219923512 U CN 219923512U
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- 238000000576 coating method Methods 0.000 title claims abstract description 177
- 239000011248 coating agent Substances 0.000 title claims abstract description 172
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 84
- 230000001050 lubricating effect Effects 0.000 title claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 37
- 238000004804 winding Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000005452 bending Methods 0.000 claims description 21
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
The utility model discloses a coating system of a titanium alloy wire surface lubricating coating, which comprises a paying-off machine, wherein an automatic coating device, a drying furnace and a wire winding machine are sequentially arranged behind the paying-off machine, the paying-off machine is used for leading out the titanium alloy wire through a roller inside the paying-off machine, and the automatic coating device, the drying furnace and the wire winding machine are used for sequentially passing through the titanium alloy wire and finishing coating, drying and wire winding of the titanium alloy wire. It has solved the problem that manual work coating efficiency is low that prior art exists.
Description
Technical Field
The utility model belongs to the technical field of coating of a lubricating coating on the surface of a titanium alloy wire, and particularly relates to a coating system of the lubricating coating on the surface of the titanium alloy wire.
Background
The titanium alloy is an important light metal structural material, and has the characteristics of high specific strength, corrosion resistance, good high-temperature performance and the like, so that the titanium alloy is widely applied to manufacturing of aircraft parts. The titanium alloy fastener is used as a bridge for riveting a matrix structure, has large demand and plays an irreplaceable role in guaranteeing the stability of the structure. In recent years, the aerospace industry rapidly develops, and higher requirements are put on the quality and the production efficiency of titanium alloy fasteners. Currently, in order to ensure the consistency of the size and quality of the fastener, aviation fastener manufacturers commonly use large single-weight disc wire rods in production, and manufacture titanium alloy fasteners through a die continuous upsetting process. The main difficulty in producing titanium alloy fasteners is that during upsetting, high load and high temperature (500-700 ℃) cause interaction between a die and titanium alloy wires to generate plastic deformation, and the wires are easy to generate faults such as malformation, scratch, crack, die sticking and the like due to high friction. Therefore, before upsetting, a layer of self-lubricating coating (3-10 mu m) is coated on the surface of the titanium wire, so that the lubricating effect in the upsetting process is ensured. At the same time, the coating thickness should be as uniform as possible, so that the metal flow rates in each part are consistent. The lubricating coating with excellent performance can effectively improve the upsetting yield of the fastener.
The titanium wire surface coating process comprises dip coating, wiping, spraying and the like, and usually requires pretreatment such as ultrasonic cleaning and post-treatment such as drying, close-packed arrangement and the like, so that the rolling process is various, and currently, all production factories generally coat the titanium wire manually, and a large amount of manpower resources are consumed. When the manual coating wire is stressed unevenly, uneven coating thickness, knots, bubbles and the like are easy to cause, and the coating quality has strong dependence on experience of operators. And when the single coating effect is poor, multiple coating operations are needed, so that the production difficulty is increased. The lubricating effect of a coating generally depends on two aspects, one being the nature of the coating itself. The coating has low friction coefficient (room temperature is less than or equal to 0.2 and high temperature is less than or equal to 0.3), certain bonding strength and heat resistance, can not volatilize at high temperature, is not easy to fall off, and can permanently exert lubricating effect. The coating property is closely related to the components of the coating liquid and the preparation process; on the other hand, depending on the coating mode, the coating should be as uniform as possible to make the metal flow rates of all parts consistent, and upsetting into a qualified fastener. The upper limit of the lubrication temperature of the coating liquid used in each production factory is 500-650 ℃, and the cured coating is easy to generate uneven thickness, knots, bubbles and the like, so that the upsetting requirement can not be completely met.
Disclosure of Invention
The utility model aims to provide a coating system of a titanium alloy wire surface lubricating coating, which is used for solving the problem of low manual coating efficiency in the prior art.
The first technical scheme adopted by the utility model is as follows: the utility model provides a coating system of titanium alloy wire surface lubrication coating, includes a paying out machine, sets gradually automatic coating device, drying furnace and admission machine behind the paying out machine, and the paying out machine is used for drawing out titanium alloy wire through its inside running roller, and automatic coating device, drying furnace and admission machine are used for supplying titanium alloy wire to pass in proper order to accomplish coating, stoving and admission to titanium alloy wire.
Further, the automatic coating device comprises a coating device for the titanium alloy wires to pass through, a liquid storage tank filled with coating liquid is arranged at the bottom of the coating device, the coating device is communicated to the liquid storage tank through a conduit, and a liquid pump is arranged on the conduit; the outlet side of the applicator is provided with a heating element.
Further, an ultrasonic cleaner is additionally arranged between the paying-off machine and the automatic coating device.
Further, a pre-bending machine is additionally arranged between the ultrasonic cleaning machine and the automatic coating device, and a plurality of wire guide wheels are arranged between the pre-bending machine and the automatic coating device.
The beneficial effects of the utility model are as follows:
1. the automatic coating device is adopted to replace manual coating, so that uneven coating thickness, knots, bubbles and the like caused by uneven stress of the manually coated wires are avoided, and the dependence on experience of operators is reduced. The obtained coating is more uniform, and the performances of the products in the same batch are consistent. The tail end of the automatic coating device is provided with a heating element, so that the initial surface drying of the coating is timely realized, and the phenomenon that the liquid accumulation at the bottom of the wire and the coating are uneven due to gravity is avoided.
2. In the coating system of the lubricating coating on the surface of the titanium alloy wire, the titanium alloy wire sequentially passes through the paying-off machine, the ultrasonic cleaner, the pre-bending machine, the automatic coating device, the drying furnace, the wire winding machine through the wire feeding guide wheel to finish the working procedures of coating, drying and the like, and the process is automatic and continuous and does not need turnover. Compared with the traditional manual coating, the method reduces intermediate steps, shortens the production period and reduces the manpower input.
Drawings
FIG. 1 is a schematic view of an automatic coating apparatus according to the present utility model;
FIG. 2 is a schematic diagram of a system for coating a lubricating coating on a surface of a titanium alloy wire according to the present utility model;
FIG. 3 is a scanning electron microscope image of the titanium alloy wire treated in example 2.
The wire drawing machine comprises a wire drawing machine body, an ultrasonic cleaning machine body, a pre-bending machine body, an automatic coating device body, a liquid storage tank, a liquid pump, a guide pipe, a drying furnace, a wire winding machine body, a titanium alloy wire body, a wire feeding guide wheel body, a wire heating guide wheel body and heating components.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the detailed description.
The utility model discloses a coating system of a titanium alloy wire surface lubricating coating, which comprises a paying-off machine 1, wherein an automatic coating device 5, a drying furnace 6 and a wire winding machine 7 are sequentially arranged behind the paying-off machine 1, the paying-off machine 1 is used for leading out a titanium alloy wire 8 through rollers in the paying-off machine, the automatic coating device 5, the drying furnace 6 and the wire winding machine 7 are used for sequentially passing through the titanium alloy wire 8 and completing pretreatment (ultrasonic cleaning and pre-bending), automatic coating and post-treatment (drying) of the titanium alloy wire 8. The titanium alloy wire 8 enters the automatic coating device 5 for coating, the coated titanium alloy wire 8 enters the drying furnace 6 for drying and then enters the wire winding machine 7, the drying furnace 6 belongs to a coating post-treatment device, the titanium alloy wire 8 after coating and preliminary surface drying passes through the constant temperature drying furnace 6 for heating and curing the coating, the furnace temperature is 100-200 ℃, and the heating time can be prolonged by reducing the wire running speed.
In some embodiments, as shown in fig. 1, the automatic coating device 5 comprises an applicator 51 for passing the titanium alloy wire 8, a liquid storage tank 52 is arranged at the bottom of the applicator 51, the applicator 51 is communicated with the liquid storage tank 52 through a conduit 54, and a liquid suction pump 53 is arranged on the conduit 54; the automatic coating apparatus 5 includes an applicator 51, a reservoir 52, a liquid pump 53, a conduit 54, and 2 heating elements 10. The applicator 51 is fixed above the liquid storage tank 52, the titanium alloy wire 8 passes through the inner cavity of the applicator 51, the coating liquid is injected into the applicator 51 through the guide pipe 54 under the action of the liquid pumping pump 53, the inner cavity of the applicator 51 is filled up, the titanium alloy wire 8 is coated, and the excessive coating liquid naturally flows out and falls into the liquid storage tank 52 below to form a closed loop.
The outlet side of the applicator 51 is provided with a heating element 10, the heater element 10 being for passing through and preliminary drying the coated titanium alloy wire 8. The titanium alloy wire 8 passes through the coater 51 and then enters a heating coil (80-120 ℃) to perform preliminary surface drying on the coating, so that the phenomena of bottom effusion and uneven coating caused by gravity are avoided. The coating method comprises the following steps: switching on the power supply of the liquid pump 53 and the heating element 10, leading the coating liquid to flow through the coater 51, returning to the liquid storage tank 52 after coating is finished, adjusting the temperature of the heating element to 80-120 ℃, and timely drying the coating; the titanium alloy wire 8 after being coated and surface-dried passes through a constant temperature drying furnace 6, and the coating is heated and solidified. The furnace temperature is set to 100-200 ℃.
According to the utility model, an automatic coating device is adopted to replace manual coating, so that uneven coating thickness, knots, bubbles and the like caused by uneven stress of the manually coated wires are avoided, and the dependence on experience of operators is reduced. The obtained coating is more uniform, and the performances of the products in the same batch are consistent. The tail end of the automatic coating device is provided with a heating element, so that the initial surface drying of the coating is timely realized, and the phenomenon that the liquid accumulation at the bottom of the wire and the coating are uneven due to gravity is avoided.
In some embodiments, an ultrasonic cleaner 3 is added between the paying-off machine 1 and the automatic coating device 5. An ultrasonic cleaner belongs to a coating pretreatment device and is used for removing greasy dirt on the surface of a wire. The water temperature is controlled between 25 ℃ and 50 ℃ during cleaning.
In some embodiments, a pre-bending machine 4 is additionally arranged between the ultrasonic cleaning machine 3 and the automatic coating device 5, and a plurality of wire guide wheels 9 are arranged between the pre-bending machine 4 and the automatic coating device 5.
A pre-bending machine 4 is additionally arranged between the ultrasonic cleaning machine 3 and the automatic coating device 5, and a plurality of wire guide wheels 9 are arranged between the pre-bending machine 4 and the automatic coating device 5. The wire can be conveniently wound up by pre-bending the coarse material. The whole device is provided with a plurality of wire guide wheels, and the wire guide wheel 9 is used for planning the walking path of the titanium alloy wire.
According to the coating system for the surface lubricating coating of the titanium alloy wire, the titanium alloy wire is coated after ultrasonic cleaning and pre-bending, the heating device is arranged on the automatic coating device 5, the titanium alloy wire sequentially passes through the ultrasonic cleaning machine 3, the pre-bending machine 4 and the automatic coating device 5, so that the lubricating layer and greasy dirt on the surface of the titanium alloy wire caused by drawing and the like can be removed, and the automatic coating of the surface lubricating coating is finished; the error that human use and manual operation probably brought has been reduced, has reduced the frictional resistance between upsetting mould and the titanium alloy wire, has avoided the mould damage problem that very easily appears in the upsetting process. Therefore, by the coating system of the lubricating coating on the surface of the titanium alloy wire, the yield of the titanium alloy wire in the subsequent upsetting procedure is improved, and the production efficiency is greatly improved.
The application method of the coating system of the lubricating coating on the surface of the titanium alloy wire comprises the following steps:
placing a titanium alloy wire 8 on a roller of a paying-off machine 1, wherein one end of the titanium alloy wire 8 sequentially passes through an ultrasonic cleaner 3, a pre-bending machine 4, an automatic coating device 5, a drying furnace 6 and a wire winding machine 7;
step two, adjusting the water temperature of the ultrasonic cleaner 3 to be between 25 and 50 ℃, and completely immersing the titanium alloy wire (8) into water for cleaning;
step three, switching on the power supply of the liquid pump 53 and the heating element 10, so that the coating liquid flows through the coater 51, returns to the liquid storage tank 52 after coating is finished, adjusts the temperature of the heating element to 80-120 ℃, and timely dries the coating;
and fourthly, the titanium alloy wire 8 after coating and surface drying passes through a constant temperature drying furnace 6, the coating is heated and solidified, and the furnace temperature is set to be 100-200 ℃.
And fifthly, taking the whole roll of the titanium alloy wire 8 off the roller of the wire winding machine 7 after coating.
The coating system of the lubricating coating on the surface of the titanium alloy wire automatically coats the lubricating coating after the surface treatment of the titanium alloy wire. And (3) passing the titanium alloy wire through an ultrasonic cleaner to remove oil stains on the surface of the titanium alloy wire. And the titanium alloy wire passes through the automatic coating device to finish the automatic coating of the surface of the titanium alloy wire, so that the uniform coating of the surface of the titanium alloy wire is ensured, and the phenomenon of missing coating is avoided. And starting the heating device to dry the titanium alloy wire after the automatic coating is finished, so as to realize the surface drying treatment of the titanium alloy wire and achieve the aim of continuous coating. The titanium alloy wire material advances to the wire winding machine to pay attention to the possible material pressing phenomenon in the wire winding process. After the wire winding process is completed, the titanium alloy wire can be transferred to the subsequent process.
Example 1
Firstly, placing a titanium alloy wire 8 on a roller of a paying-off machine 1, and enabling one end of the titanium alloy wire to sequentially pass through an ultrasonic cleaner, a pre-bending machine, an automatic coating device, a drying furnace 6 and a wire winding machine 7, so that the wire is ensured to pass through the middle positions of all mechanisms. Each mechanism is provided with a plurality of wire guide wheels 9 which are made of self-lubricating materials such as polytetrafluoroethylene and the like, and the scraping and rubbing are prevented.
And step two, adjusting parameters of the ultrasonic cleaning machine 3 and the pre-bending machine 4. The temperature of the ultrasonic cleaning water is controlled between 25 ℃ and 50 ℃, and the wire is completely immersed in the water; according to different brands and specifications of the titanium alloy wires, the values of the pre-bending table are different, and the diameter of the pre-bent titanium alloy wires after 8 circles is 800-1500 mm, so that the follow-up disc round arrangement is convenient.
Step three, switching on a liquid pump 53 and a power supply of a heating element 10, so that the coating liquid prepared in the coating method of the lubricating coating on the surface of the titanium alloy wire material flows through a coater 51, and returns to a liquid storage tank 52 to form a closed loop after coating is finished; the temperature of the heating element is regulated to 80-120 ℃, and the coating and the surface are dried.
And step four, the titanium alloy wire 8 after coating and surface drying passes through a constant temperature drying furnace 6, the coating is heated and solidified, and the furnace temperature is set to be 100-200 ℃.
And fifthly, taking down the whole roll of wire from the roller of the wire winding machine 7 after coating is finished, and bundling.
And step six, checking and packaging. The surface is free from knots, bubbles, scratches and effusion, and the coating is uniform, thus being a qualified product.
Example 2
Firstly, selecting TC4 wires with the diameter of 5.3mm, placing the wires in a roller of a paying-off machine 1, sequentially passing one end of the wires through an ultrasonic cleaner 3, a pre-bending machine 4, an automatic coating device, a drying furnace 6 and a wire winding machine 7 by a wire guide wheel 9, and passing the wires from the middle positions of the mechanisms by the wire guide wheel 9, wherein the wire feeding speed is 1m/min.
And step two, adjusting parameters of the ultrasonic cleaning machine 3 and the pre-bending machine 4. Controlling the water temperature of ultrasonic cleaning to be about 50 ℃, and completely immersing the wire in water; the diameter of the pre-bent titanium alloy wire is 1000-1200 mm.
Step three, the coating liquid prepared in the coating method of the lubricating coating on the surface of the titanium alloy wire material is used, and the effective lubricating component is MoS 2 The rest components are abrasive and binder. Switching on the liquid pump 53 and the power supply of the heating element 10 to enable the coating liquid to flow through the coating device 51, and returning to the liquid storage tank 52 to form a closed loop after coating is completed; the temperature of the two heating elements 10 was adjusted to 80℃and 120℃respectively.
And step four, the titanium alloy wire 8 after coating and surface drying passes through a constant temperature drying furnace 6, the coating is heated and solidified, and the furnace temperature is set to be 180 ℃.
And fifthly, taking down the whole roll of wire from the roller of the wire winding machine 7 after coating is finished, and bundling.
And step six, checking and packaging. The surface is free from knots, bubbles, scratches and effusion, and the coating is uniform, thus being a qualified product.
Example 2 the surface topography coating of the coated wire was uniform, smooth, free of nodules and bubbles. The thickness of the coating was measured by scanning electron microscopy and was 7.7-9.5 μm. The test upsetting test shows that the lubrication failure temperature of the coating is 750 ℃, and the upsetting requirement of the fastener is met. The upset product has regular shape, smooth surface and smooth demoulding, which indicates that the coating plays a good lubricating role.
Example 3
Firstly, selecting a TB9 wire with the diameter of 4.09mm, placing the TB9 wire in a roller of a paying-off machine 1, sequentially passing one end of the TB9 wire through an ultrasonic cleaner, a pre-bender, an automatic coating device, a drying furnace and a wire winding machine by a wire feeding guide wheel 9, and passing the wire from the middle position of each mechanism by the wire feeding guide wheel 9, wherein the wire feeding speed is 1m/min.
And step two, adjusting parameters of the ultrasonic cleaning machine 3 and the pre-bending machine 4. Controlling the water temperature of ultrasonic cleaning to be about 50 ℃, and completely immersing the wire in water; the diameter of the pre-bent titanium alloy wire is 1000-1200 mm.
Step three, the coating liquid prepared in the coating method of the lubricating coating on the surface of the titanium alloy wire material is used, and the effective lubricating component is MoS 2 The rest components are abrasive and binder. Switching on the liquid pump 53 and the power supply of the heating element 10 to enable the coating liquid to flow through the coating device 51, and returning to the liquid storage tank 52 to form a closed loop after coating is completed; the two heating elements were adjusted to 80℃and 120℃respectively.
And step four, the coated and surface-dried titanium alloy wire 8 passes through a constant-temperature drying furnace 6, the coating is heated and solidified, and the furnace temperature is set to be 180 ℃.
And fifthly, taking down the whole roll of wire from the roller of the wire winding machine 7 after coating is finished, and bundling.
And step six, checking and packaging. The surface is free from knots, bubbles, scratches and effusion, and the coating is uniform, thus being a qualified product.
Example 3 the wire surface was coated with a uniform, smooth coating without nodules or bubbles. The coating thickness was measured by scanning electron microscopy and was 6.7-8.6 μm. The test upsetting test shows that the lubrication failure temperature of the coating is 730 ℃ and meets the upsetting requirement of the fastener. The upset product has regular shape, smooth demoulding and smooth surface, and the coating layer has good lubrication effect.
Claims (4)
1. A coating system for a titanium alloy wire surface lubricating coating, comprising:
the wire paying-off machine (1), automatic coating device (5), drying furnace (6) and wire winding machine (7) set gradually behind wire paying-off machine (1), wire paying-off machine (1) is used for drawing out titanium alloy wire (8) through its inside running roller, automatic coating device (5), drying furnace (6) and wire winding machine (7) are used for supplying titanium alloy wire (8) pass in proper order, and accomplish to coating, stoving and the receipts line of titanium alloy wire (8).
2. A system for applying a lubricating coating to a surface of a titanium alloy wire according to claim 1, wherein the automatic coating device comprises an applicator (51) for passing the titanium alloy wire (8), a reservoir (52) containing a coating liquid is provided at the bottom of the applicator (51), the applicator (51) is communicated to the reservoir (52) through a conduit (54), and a liquid pump (53) is provided on the conduit (54); a heating element (10) is arranged on the outlet side of the applicator (51).
3. A system for coating a lubricating coating on the surface of a titanium alloy wire according to claim 2, characterized in that an ultrasonic cleaner (3) is additionally arranged between the paying-off machine (1) and the automatic coating device (5).
4. A system for coating a lubricating coating on a titanium alloy wire surface according to claim 3, wherein a pre-bending machine (4) is additionally arranged between the ultrasonic cleaning machine (3) and the automatic coating device (5), and a plurality of wire guide wheels (9) are arranged between the pre-bending machine (4) and the automatic coating device (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223415347.1U CN219923512U (en) | 2022-12-19 | 2022-12-19 | Coating system of titanium alloy wire surface lubricating coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223415347.1U CN219923512U (en) | 2022-12-19 | 2022-12-19 | Coating system of titanium alloy wire surface lubricating coating |
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| Publication Number | Publication Date |
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| CN219923512U true CN219923512U (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223415347.1U Active CN219923512U (en) | 2022-12-19 | 2022-12-19 | Coating system of titanium alloy wire surface lubricating coating |
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| Country | Link |
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| CN (1) | CN219923512U (en) |
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