Search

CN-122007811-A - Processing method of friction plate with coating structure

CN122007811ACN 122007811 ACN122007811 ACN 122007811ACN-122007811-A

Abstract

The invention relates to a processing method of a friction plate with a coating structure, which belongs to the technical field and comprises the following operation steps of processing, forming and preprocessing a substrate of the friction plate. And the second step, preparing a friction material layer, and compounding a friction material layer on the substrate before coating treatment. And thirdly, coating by adopting friction coating technology, electroplating, thermal spraying or physical vapor deposition technology. And fourthly, carrying out post-treatment and finish machining after the coating is finished. And fifthly, performance detection and warehousing, namely performing omnibearing performance detection on a finished product, wherein the comprehensive performance detection comprises coating bonding strength, thickness, hardness, friction coefficient and wear resistance, and performing rust prevention treatment and packaging warehousing after the finished product is qualified. Has the advantages of high bonding strength, strong corrosion resistance and high performance controllability. Effectively solves the problem that the traditional friction plate is easy to fail in corrosive or medium environments. The thickness precision and the flatness of the friction plate are ensured, and the smooth engagement of the clutch or the brake is ensured.

Inventors

  • ZHANG JIAHUI
  • CHEN SUXIAN
  • WU HUAZHONG
  • LUO XIANGCUN
  • Hu Fangdan
  • SHEN DA
  • WU YUXIN

Assignees

  • 杭州萧山红旗摩擦材料有限公司

Dates

Publication Date
20260512
Application Date
20260225

Claims (7)

  1. 1. The processing method of the friction plate with the coating structure is characterized by comprising the following operation steps: the first step, the matrix of the friction plate is processed, molded and pretreated, wherein the pretreatment process comprises purification treatment, roughening treatment and preheating; The oil stain, rust and oxide skin on the surface of the steel core plate are thoroughly removed by purification treatment, and alkali liquor cleaning, solvent cleaning or acid cleaning is adopted to ensure the primary link of the bonding strength of the subsequent coating; the roughening treatment adopts sand blasting treatment, so that uniform microscopic concave-convex is formed on the surface of the substrate, and the mechanical locking force of the coating and the substrate is increased; preparing a friction material layer, namely compounding a layer of friction material on a substrate before coating treatment; Thirdly, adopting friction coating technology, electroplating, thermal spraying or physical vapor deposition technology to carry out coating; the fourth step, carrying out post-treatment and finish machining after finishing the coating, carrying out hole sealing treatment on the porous coating, finishing oil groove machining, and then grinding and lapping; the pore exists after the coating process is finished, and the substrate can be corroded and failed when working in a corrosive or dielectric environment; the oil groove processing is important to the wet friction plate and is used for storing lubricating oil, promoting heat dissipation and discharging abrasive dust, and the joint stability and the thermal stability of the friction plate are directly affected; The grinding and lapping process ensures the thickness precision, flatness and surface roughness of the friction plate, ensuring the smooth engagement of the clutch or brake; And fifthly, performance detection and warehousing, namely performing omnibearing performance detection on a finished product, wherein the comprehensive performance detection comprises coating bonding strength, thickness, hardness, friction coefficient and wear resistance, and performing rust prevention treatment and packaging warehousing after the finished product is qualified.
  2. 2. The method for processing the friction plate with the coating structure according to claim 1, wherein the friction material layer is divided into a paper-based friction material, a copper-based powder metallurgy friction material or a resin-based/rubber-based friction material, the paper-based friction material is processed like paper making, comprises pulping, paper making, drying and cutting into rings, then is subjected to multiple gum dipping and drying, finally is bonded with a core plate in a vulcanization press at high temperature and high pressure, the copper-based powder metallurgy friction material is formed by pressing mixtures of copper powder, friction components, lubricating components and the like in a vulcanization press, and then is sintered in a protective atmosphere to be metallurgically bonded with a steel core plate, and the resin-based/rubber-based friction material is subjected to hot press forming, and is formed by heating, pressurizing and solidifying the mixtures of fibers, resin/rubber and filler in a die.
  3. 3. The method for manufacturing a friction plate with a coating structure according to claim 1, wherein the substrate is heated at 70-130 ℃ and kept warm for 2 hours during preheating.
  4. 4. The method of claim 1, wherein the friction coating technique forms a coating by a frictional thermal coupling action, the metal rod rubs against the surface of the substrate at a high speed under pressure, the frictional heat generated causes severe plastic deformation and softening of the contact material, and the plasticized material is subsequently applied to the surface of the substrate by an upsetting force to form a strong metallurgical bond coating.
  5. 5. The method of claim 1, wherein the thermal spraying comprises heating the coating material to a molten or semi-molten state using a heat source that is flame, arc or plasma, and spraying the coating material onto the surface of the pretreated substrate at a high velocity to form the coating.
  6. 6. The method for manufacturing a friction plate with a coating structure according to claim 1, wherein the physical vapor deposition is performed under vacuum conditions, and the coating material is gasified and deposited on the surface of the workpiece by using a physical process, wherein the physical process is sputtering or evaporation.
  7. 7. The method of claim 1, wherein the sealant is selected from the group consisting of air-dried glyceride resin at a temperature less than 145 ℃ and silicate or chromate at a temperature greater than 145 ℃.

Description

Processing method of friction plate with coating structure Technical Field The invention relates to the technical field of friction materials, in particular to a processing method of a friction plate with a coating structure. Background The field of friction plate (for clutches, brakes, etc.) processing is generally faced with the following problems and status quo: 1. The traditional friction material has the performance limitation that although the traditional paper-based, copper-based powder metallurgy or resin-based friction material has certain friction performance, the surface hardness and the wear resistance of the friction material are often insufficient under extreme working conditions (such as high load, high rotating speed and corrosive medium environment), so that the service life of the friction plate is shortened. The bare friction material layer is easy to deteriorate or rust in a wet or corrosive medium, and the stability of functions is affected. 2. The application bottleneck of the surface coating technology is that although the surface coating technology (such as thermal spraying, electroplating and the like) can obviously improve the surface hardness and the wear resistance, the insufficient bonding strength is a core difficult problem due to the large difference of the material properties of a substrate and a coating when the friction plate is applied to the field of friction plates. The coating is susceptible to spalling under severe frictional thermal coupling, resulting in failure. The coating process typically produces microscopic voids. In the application scenario of the wet friction plate, lubricating oil or external corrosive medium easily permeates into the matrix through the pores, so that the matrix is corroded and fails, which is a pain point which is often neglected in the conventional process. 3. The existing processing flow often lacks specific pretreatment and post-treatment specifications. For example, lack of effective roughening treatment results in insufficient mechanical locking force, lack of sealing treatment results in poor corrosion resistance, lack of accurate oil groove and grinding process results in reduced joint smoothness. Disclosure of Invention The invention mainly solves the defects existing in the prior art, and provides a processing method of a friction plate with a coating structure, which has the advantages of high bonding strength, strong corrosion resistance and high performance controllability. By applying the specific coating technology to the surface of the friction plate and combining a specific hole sealing process, the problem that the traditional friction plate is easy to fail in a corrosive or dielectric environment is effectively solved. Meanwhile, the thickness precision and the flatness of the friction plate are ensured by the multi-step pretreatment and finish machining, and the smooth engagement of the clutch or the brake is ensured. The technical problems of the invention are mainly solved by the following technical proposal: A processing method of a friction plate with a coating structure comprises the following operation steps: the first step is that the base body of the friction plate is processed, shaped and pretreated, and the pretreatment process comprises purification treatment, roughening treatment and preheating. The oil stain, rust and oxide skin on the surface of the steel core plate are thoroughly removed by the purification treatment, and the primary link of the subsequent coating bonding strength is ensured by adopting alkali liquor cleaning, solvent cleaning or acid cleaning. The roughening treatment adopts sand blasting treatment, so that uniform microscopic concave-convex is formed on the surface of the substrate, and the mechanical locking force of the coating and the substrate is increased. And the second step, preparing a friction material layer, and compounding a friction material layer on the substrate before coating treatment. And thirdly, coating by adopting friction coating technology, electroplating, thermal spraying or physical vapor deposition technology. And fourthly, carrying out post-treatment and finish machining after finishing the coating, carrying out hole sealing treatment on the porous coating, finishing oil groove machining, and then grinding and lapping. The pore exists after the coating process is finished, the corrosion failure of the matrix can be caused when the coating process works in a corrosive or dielectric environment, the hole sealing is a necessary post-treatment procedure, and the hole sealing treatment adopts a hole sealing agent to finish the hole sealing of the coating. The oil groove processing is of great importance to the wet friction plate, and is used for storing lubricating oil, promoting heat dissipation and discharging abrasive dust, and directly affecting the joint stability and thermal stability of the friction plate. The grinding and lapping process ensures friction plat