Forming process for improving bonding strength of fabric liner and metal matrix

Abstract

The invention provides a forming process for improving the bonding strength of a fabric liner and a metal matrix. The forming process comprises the following steps: step 1, manufacturing the fabric liner; 2, preparing a resin solution; step 3, gum dipping treatment; step 4, repeating the step 2 until the mass of the braided fabric is increased by 10-20%; 5, pressing the resin into pores of the braided fabric in a rolling manner; sixthly, the surface of the metal is coated with a binding agent; seventhly, force with certain strength is applied to the bonding surface of the liner and the metal base body, and the liner and the metal base body are placed in a high-temperature drying box to be cured and bonded; and 8, testing the bonding strength of the fabric liner and the surface of the metal matrix. Aiming at the defects in the prior art, the invention provides the forming process for improving the bonding strength of the fabric liner and the metal matrix, the bonding strength of the fabric liner and the metal matrix can be enhanced, and meanwhile, the friction and wear performance of the surface of the liner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid lubricating bearings, in particular to a forming process for improving the bonding strength between a fabric liner and a metal matrix. Background Art

[0002] As the core component of solid lubrication, the bonding performance between the liner material and the surface of the metal matrix and the surface friction and wear performance directly affect the operation stability and reliability of the solid lubricating bearing, and thus play a key role in the service life of the related precision control system. The solid lubrication technology is commonly used in extreme high and low temperatures, high radiation and other harsh environments such as aerospace. Due to the limitation of the operating temperature range of the lubricating grease, the solid lubrication technology is required to ensure the stable operation of the components of the high-precision transmission system. Solid lubrication is achieved by braiding PTFE, aramid fiber, etc. into a fabric, impregnating it with glue and curing it, and then bonding it to the surface of the metal matrix to form a stable solid lubricating film. It is generally applied to working conditions such as low-speed swing or joint bearings. Since the liner in contact with the metal surface plays an absolute lubricating role, it can ensure the low torque and high reliability of the rotating product. Therefore, the surface friction and wear performance of the liner and the bonding strength with the surface of the metal matrix are the key in the related technical fields.

[0003] However, for the self-lubricating liner of the prior art, it is bonded to the inner surface of the outer ring of the self-lubricating bearing, and then lubrication is achieved by the relative rotation of the inner surface of the inner ring and the self-lubricating liner on the inner surface of the outer ring. The main problems of the self-lubricating liner in the use process are insufficient wear resistance on the liner surface and unstable bonding with the metal surface matrix. During the long-term operation process, the liner will be separated from the inner surface of the outer ring, which will affect the service life of the solid lubricating bearing. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a forming process for improving the bonding strength between a fabric liner and a metal matrix, which can enhance the bonding strength between the fabric liner and the metal matrix and improve the surface friction and wear performance of the liner at the same time.

[0005] To achieve the above object, the present invention provides a forming process for improving the bonding strength between a fabric liner and a metal matrix, which is characterized by including the following steps: Step 1, the PTFE monofilaments are twisted into multi-filaments to form a working surface, and the aramid fiber monofilaments are twisted into multi-filaments to form a bonding surface combined with the metal matrix. The two are woven into a fabric liner; Step 2, the resin adhesive and the organic solvent are premixed in proportion to form a resin solution, and the lubricating modifier is dispersed in the resin solution; Step 3, the woven material is cut into appropriate sizes and impregnated with the resin solution; Step 4, repeat Step 2 until the mass of the woven fabric increases by 10-20%, and then enter Step 5; Step 5, after the impregnation treatment, the resin is pressed into the pores of the woven fabric by rolling to enhance the strength of the woven fabric; Step 6, apply a binder on the metal surface to bond the cured fabric liner to the metal matrix; Step 7, apply a certain strength of force to the bonding surface of the liner and the metal matrix, and place it in a high-temperature drying oven for curing and bonding to enhance the bonding strength between the liner and the metal matrix; Step 8, test the bonding strength between the fabric liner and the metal matrix surface.

[0006] Further, in Step 1, during the weaving process of the fabric liner material, multiple PTFE materials with monofilament multi-filaments with a diameter of about 15-25 um are selected as the working surface, and the diameter of the multi-filament is 300-350 um. Multiple aramid fiber materials with monofilament multi-filaments with a diameter of about 8-15 um are selected as the bonding surface combined with the metal matrix, and the diameter of the multi-filament is about 300-350 um. The twill pattern with better load-bearing capacity and lubrication effect is selected for weaving.

[0007] Further, in Step 3, during the impregnation process, about 3-6% of MoS2 self-lubricating filler is added to the resin to enhance the lubrication performance of the liner surface. Ultrasonic vibration is used to make MoS2 evenly dispersed in the solvent containing the resin.

[0008] Further, in Step 4, after the cut liner material is immersed in the organic solvent containing the resin, magnetic stirring is used to make the resin better adhere to the surface of the liner material, and the impregnation time is controlled within 20-30 min.

[0009] Further, in Step 5, take it out and place it on a stainless steel rolling press with a smooth surface for rolling. During the rolling process, control the gap between the two rollers to make the resin better enter the pores of the matrix.

[0010] Further, in Step 6, the binder is to add a small amount of metal oxide on the basis of the resin solution components during the impregnation process to increase the bonding area between the liner and the metal surface.

[0011] Further, in Step 6, the metal surface is polished, and the surface roughness Ra is controlled within 0.5-1.0 um.

[0012] Further, in Step 7, the temperature is controlled at 120 - 180 °C, the curing time is controlled at 2 - 8 h, and the curing pressure is controlled at 0.05 - 0.1 MPa.

[0013] The advantages of adopting the above technical solution are as follows: By means of surface treatment of the gasket, special dipping, and curing process, the bonding strength between the fabric gasket and the metal matrix is enhanced, and at the same time, the friction and wear performance of the gasket surface is improved. Description of the Drawings

[0014] Figure 1 It is a schematic flow chart of an embodiment of the present invention; Detailed Embodiments

[0015] An embodiment of a forming process for improving the bonding strength between a fabric gasket and a metal matrix of the present invention is as Figure 1 shown and includes the following steps: Step 1: Select multiple PTFE monofilaments with a diameter of about 15 - 25 μm to twist into a long multifilament as the working surface. The diameter of the long multifilament is 300 - 350 μm. Select multiple monofilaments with a diameter of about 8 - 15 μm to twist into a long multifilament as the bonding surface for bonding with the metal matrix. The diameter of the long multifilament is about 300 - 350 μm. Weave the two together to form a fabric gasket. This weaving method shows that the working surface is mainly composed of PTFE, and each layer of PTFE has aramid fiber reinforcement below, so while ensuring a low friction coefficient, it can endow the matrix with good wear resistance. Step 2: Premix the resin adhesive and the organic solvent in a certain proportion to form a resin solution. The lubricating modifier is dispersed in the resin solution to form an elastomer-modified phenolic resin, which has good thermal stability and high elasticity, and at the same time has good bonding ability with the metal matrix; Step 3: Since the resin has a high viscosity, the resin solution needs to be mixed with an easily volatile organic solvent, and the mixing ratio is controlled within the range of 20 - 30% resin concentration. During the dipping process, about 3 - 6% of MoS2 self-lubricating filler is added to the resin to enhance the lubrication performance of the gasket surface. Use ultrasonic vibration to evenly disperse MoS2 in the resin solvent. Immerse the cut gasket material into the organic solvent containing the resin, and use magnetic stirring to make the resin adhere to the surface of the gasket material. The dipping time is controlled at 20 - 30 min; Step 4: Repeat Step 2 until the mass of the woven fabric increases by 10 - 20%, and then enter Step 5; Step 5: Then take it out and place it on a stainless - steel roller press with a smooth surface for rolling. During the rolling process, control the gap between the two rollers well to enable the resin to better enter the pores of the matrix. After the surface of the gasket is modified with a solid lubricant to reduce the surface friction coefficient, due to the attachment of MoS2 on the side surface of aramid, the bonding strength with the metal matrix is increased. After the impregnation treatment, the resin is pressed into the pores of the fabric by rolling to enhance the strength of the fabric; Step 6: Apply an adhesive on the metal surface. Based on the resin solution for the adhesive and impregnation processes, add a small amount of special metal oxides. According to the principle of similar compatibility, it can bond better. At the same time, the metal oxides in the adhesive can increase the bonding area between the gasket and the metal surface, enabling the cured fabric gasket to bond with the metal matrix. To further increase the bonding strength between the gasket and the metal surface, the metal surface is polished, and the surface roughness Ra is controlled at 0.5 - 1.0 μm. A metal surface with a certain roughness can enable the adhesive to enter the depressions on the matrix surface and bond more firmly with the gasket material cured at room temperature; Step 7: The curing process during the bonding of the impregnated gasket material to the metal matrix surface adopts high - temperature curing. The temperature is controlled at 120 °C, the curing time is controlled at 8 h, and the curing pressure is controlled at 0.05 MPa; Step 8: After testing, the bonding strength between the fabric gasket and the metal matrix surface is 1.62 / N / mm, and the wear amount is 0.2866 / mg.

[0016] In Example 2 of the forming process for improving the bonding strength between a fabric gasket and a metal matrix according to the present invention, the difference from Example 1 lies in: The curing process during the bonding of the impregnated gasket material to the metal matrix surface adopts high - temperature curing. The temperature is controlled at 150 °C, the curing time is controlled at 6 h, and the curing pressure is controlled at 0.05 MPa; After testing, the bonding strength between the fabric gasket and the metal matrix surface is 2.13 / N / mm, and the wear amount is 0.2741 / mg.

[0017] In Example 3 of the forming process for improving the bonding strength between a fabric gasket and a metal matrix according to the present invention, the difference from Example 1 lies in: The curing process during the bonding of the impregnated gasket material to the metal matrix surface adopts high - temperature curing. The temperature is controlled at 180 °C, the curing time is controlled at 2 h, and the curing pressure is controlled at 0.05 MPa; After testing, the bonding strength between the fabric gasket and the metal matrix surface is 2.19 / N / mm, and the wear amount is 0.3002 / mg.

[0018] In Example 4 of the forming process for improving the bonding strength between a fabric gasket and a metal matrix according to the present invention, the difference from Example 1 lies in: During the bonding process between the impregnated gasket material and the surface of the metal matrix, the curing process adopts high-temperature curing, with the temperature controlled at 120°C, the curing time controlled at 8 h, and the curing pressure controlled at 0.10 MPa; After testing, the bonding strength between the fabric gasket and the surface of the metal matrix is 1.64 N / mm, and the wear amount is 0.2967 mg.

[0019] Example 5 of the forming process for improving the bonding strength between a fabric gasket and a metal matrix according to the present invention is different from Example 1 in that: During the bonding process between the impregnated gasket material and the surface of the metal matrix, the curing process adopts high-temperature curing, with the temperature controlled at 150°C, the curing time controlled at 6 h, and the curing pressure controlled at 0.10 MPa; After testing, the bonding strength between the fabric gasket and the surface of the metal matrix is 1.64 N / mm, and the wear amount is 0.2816 mg.

[0020] Example 6 of the forming process for improving the bonding strength between a fabric gasket and a metal matrix according to the present invention is different from Example 1 in that: During the bonding process between the impregnated gasket material and the surface of the metal matrix, the curing process adopts high-temperature curing, with the temperature controlled at 180°C, the curing time controlled at 2 h, and the curing pressure controlled at 0.10 MPa; After testing, the bonding strength between the fabric gasket and the surface of the metal matrix is 2.22 N / mm, and the wear amount is 0.2987 mg.

[0021] The above examples are only one of the preferred specific examples of the present invention. All common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A molding process for improving the bonding strength between a fabric liner and a metal matrix, characterized in that, It includes the following steps: Step 1: The PTFE monofilament twisted strands grow into multifilaments as the working surface, and the aramid fiber monofilament twisted strands grow into multifilaments as the bonding surface for bonding with the metal matrix. The two are woven and formed into a fabric gasket; Step 2: The resin adhesive and the organic solvent are premixed in proportion to form a resin solution, and the lubricating modifier is dispersed in the resin solution; Step 3: The woven material is cut into appropriate sizes and subjected to dipping treatment in the resin solution; Step 4: Repeat Step 2 until the mass of the woven fabric increases by 10 - 20%, and then enter Step 5; Step 5: After the dipping treatment, the resin is pressed into the pores of the woven fabric by rolling to enhance the strength of the woven fabric; Step 6: Apply an adhesive on the metal surface to bond the cured fabric gasket to the metal matrix; Step 7: Apply a certain strength of force to the bonding surface of the gasket and the metal matrix, place it in a high-temperature drying oven for curing and bonding to enhance the bonding strength between the gasket and the metal matrix; Step 8: Test the bonding strength between the fabric gasket and the metal matrix surface.

2. The forming process for improving the bonding strength between a fabric liner and a metal matrix according to claim 1, characterized in that: In Step 1, during the weaving process of the fabric gasket material, multiple PTFE materials with single-filament twisted strands growing into multifilaments with a diameter of about 15 - 25 μm are selected as the working surface, and the multifilament diameter is 300 - 350 μm. Multiple aramid fiber materials with single-filament twisted strands growing into multifilaments with a diameter of about 8 - 15 μm are selected as the bonding surface for bonding with the metal matrix, and the multifilament diameter is about 300 - 350 μm. The twill weave method with better load-bearing capacity and lubrication effect is selected for weaving and forming.

3. The forming process for improving the bonding strength between a fabric liner and a metal matrix according to claim 1, characterized in that: In Step 3, during the dipping process, about 3 - 6% of MoS2 self-lubricating filler is added to the resin to enhance the lubrication performance of the gasket surface. Ultrasonic vibration is used to make MoS2 evenly dispersed in the solvent containing the resin.

4. The forming process for improving the bonding strength between the fabric liner and the metal matrix according to claim 1, characterized in that: In Step 4, after the cut gasket material is immersed in the organic solvent containing the resin, magnetic stirring is used to make the resin better adhere to the surface of the gasket material, and the dipping time is controlled within 20 - 30 min.

5. The forming process for improving the bonding strength between the fabric liner and the metal matrix according to claim 1, characterized in that: In Step 5, take it out and place it on a stainless steel roller press with a smooth surface for rolling. During the rolling process, control the gap between the two rollers well to make the resin better enter the pores of the matrix.

6. The forming process for improving the bonding strength between the fabric liner and the metal matrix according to claim 1, wherein: In Step 6, the adhesive is to add a small amount of metal oxide on the basis of the resin solution components during the dipping process to increase the bonding area between the gasket and the metal surface.

7. The forming process for improving the bonding strength between a fabric liner and a metal matrix according to claim 1, characterized in that: In Step 6, the metal surface is polished, and the surface roughness Ra is controlled within 0.5 - 1.0 μm.

8. The forming process for improving the bonding strength between the fabric liner and the metal matrix according to claim 1, characterized in that: In Step 7, the temperature is controlled at 120 - 180 °C, the curing time is controlled within 2 - 8 h, and the curing pressure is controlled within 0.05 - 0.1 MPa.

Images