Manufacturing method of PTFE (polytetrafluoroethylene) fabric self-lubricating spherical plain bearing

Abstract

The invention discloses a manufacturing method of a PTFE (polytetrafluoroethylene) fabric self-lubricating spherical plain bearing. The manufacturing method comprises the following steps: one surface of a PTFE fabric liner is coated with glue A which is irreversible after curing; the fabric coated with the glue A is subjected to rolling treatment; the fabric liner is cured by adopting a panel hot-pressing technology; the cured fabric liner is cut into a size suitable for an inner spherical surface of an outer ring of the spherical plain bearing; the inner spherical surface of the outer ring or the other surface of the fabric liner is coated with glue B; then the fabric liner is adhered to the inner spherical surface of the outer ring through the glue B; an inner ring of the spherical plain bearing is sleeved into the outer ring of the spherical plain bearing, which is adhered to the fabric liner; the cured surface of the fabric liner faces to an outer spherical surface of the inner ring for mutual coupling and contact; the periphery of the outer ring is sleeved with a curing lantern ring; and the bearing is put into an oven for oven heating. The curing method not only can ensure the strength and abrasion resistance of the fabric liner, but also avoids the step of coating the outer spherical surface of the inner ring with a mold release agent.

Description

technical field [0001] The invention relates to a method for manufacturing a PTFE fabric self-lubricating joint bearing. Background technique [0002] In the existing PTFE fabric self-lubricating joint bearings, the curing time of the PTFE fabric liner is to heat and cure at the same time after being assembled with the inner ring and the outer ring. Firstly, the colloid A is coated on the friction surface of the fabric liner, and the colloid A B is coated on the adhesive surface of the fabric liner, and then pasted on the inner spherical surface of the outer ring, loaded into the inner ring coated with a release agent on the outer spherical surface, and then pressed into the curing collar, and finally placed in the oven in the setting Curing is carried out at a certain curing temperature and baking time. [0003] Problems in this method: 1. The release agent coated on the outer spherical surface of the inner ring is attached to the outer spherical surface of the inner ring ...

AI Technical Summary

Problems solved by technology

[0003] Problems in this method: 1. The release agent coated on the outer spherical surface of the inner ring is attached to the outer spherical surface of the inner ring by soaking in a liquid release agent, but it cannot ensure that a protective film with uniform thickness is formed on the spherical surface, resulting in coating The layer is uneven, and when it is in contact with the sticky fabric pad, it will be partially unable to be released from the mold when it is cured, resulting in curing failure; 2. In order to prevent the above-mentioned local non-release situation, it needs to be soaked multiple times, generally more than three times , the processing efficiency is low; 3. Even if the method of multiple soaking is adopted, spherical friction will occur during the assembly process of putting the inner ring into the outer ring, and part of the release agent coating layer on the outer spherical surface of the inner ring will still be scratched Wipe off, resulting in poor demoulding effect or even curing failure; 4. The release agent is a volatile chemical that pollutes the environment and is harmful to the health of the operator; 5. Colloid A will interact with the colloid during the curing process. B interpenetration, resulting in a decrease in wear resistance and bonding strength; 6. The existing fabric liner is assembled with the inner ring and outer ring and pressed into the curing collar and then heated and cured at the same time. In the initial stage of curing The pressure on the fabric pad can be generated by the interference force between the curing collar and the outer ring, but when the curing temperature reaches the set temperature of 150-180°C, colloid A begins to soften, which will weaken or disappear the interference force , so that continuous curing pressure cannot be provided during the whole curing process, which results in poor strength and wear resistance of the cured fabric liner, and ultimately leads to low service life of the bearing

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