Brazing composite multi-layer modified polyether ketone plastic sliding bearing and manufacturing method thereof

Abstract

The invention relates to a multi-layer modified polyether ketone composite material sliding bearing compounded by adopting a hard soldering method and a manufacturing method of the multi-layer modified polyether ketone composite material sliding bearing. The multi-layer modified polyether ketone composite material sliding bearing is composed of a bearing base body (1), a metal wire connection transition layer (2) and a modified polyether ketone plastic bearing surface (3). The bearing base body (1) is made of metal, the metal wire connection transition layer (2) is a wire pad which is formed by pressing a spring wound by metal wires and has certain porosity, and the metal wire connection transition layer (2) is welded on the surface of the metal base body by adopting a hard soldering method. Wherein a part of the metal wire layer is filled with brazing filler metal to form a metal wire and brazing filler metal composite layer (4). And the other part of the metal wire connecting transition layer applies modified polyether ketone plastic into pores of the metal wire layer by adopting an injection molding method to prepare a modified polyether ketone plastic and metal wire composite layer (5). The bearing has the characteristics that the metal wire layer plays a role in connection and transition and effectively absorbs stress change caused by difference of linear expansion coefficients of various materials, so that the modified polyether ketone plastic is prevented from being separated from a bearing base body and is prevented from being cracked.

Description

Technical Field

[0001] The invention relates to a brazing composite multi-layer modified polyetherketone plastic sliding bearing and a manufacturing method thereof, belonging to the technical field of composite material sliding bearings. Background Art

[0002] Polyetherketone plastics (including polyetheretherketone PEEK, polyetherketone PEK, polyaryletherketone PAEK, etc.) as a polymer material have the characteristics of high strength, good toughness, thermal stability, wear resistance, etc. The modified materials are more suitable for bearing materials with wear / friction, heavy load, high temperature, high speed, self-lubrication, and long service life; At present, the sliding bearings made of such materials, such as the composite process of PEEK and metal matrix, generally adopt the method of machining various grooves on the metal surface to composite and modify PEEK plastic, or weld copper powder or metal wire mesh on the metal surface and then composite PEEK plastic. Due to the large difference in linear expansion coefficients of various materials, the internal stress changes greatly when the temperature changes, which can easily cause the two to separate when the bearing load is large and used for a long time. Summary of the invention

[0003] The purpose of the present invention is to provide a brazing composite multi-layer modified polyether ketone plastic sliding bearing and a manufacturing method thereof. By adopting a metal wire layer transition method, a new structure for manufacturing a modified polyether ketone plastic sliding bearing and an optimal process for the bearing are provided, thereby overcoming the shortcomings of the prior art that various materials have large differences in linear expansion coefficients, internal stress changes greatly when the temperature changes, and the two are easily separated or the material itself cracks when the bearing load is large or the vibration is large.

[0004] A brazing composite multilayer modified polyetherketone plastic sliding bearing, comprising a bearing base (1), a metal wire connection transition layer (2), and a modified polyetherketone plastic bearing surface (3), characterized in that: The metal wire connection transition layer (2) is a wire pad with a certain porosity formed by winding metal wire into a spring and pressing it, which is welded to the surface of the metal substrate by a brazing method, wherein a part of the metal wire connection transition layer is filled with solder to form a metal wire and solder composite layer (4), and the remaining part of the metal wire connection transition layer is formed by applying modified polyether ketone plastic to the pores of the metal wire layer by an injection molding method to form a modified polyether ketone plastic and metal wire composite layer (5).

[0005] A brazing composite multilayer modified polyetherketone plastic sliding bearing and a manufacturing method thereof, characterized by comprising the following steps: Preparation of metal wire pad: The metal wire connecting transition layer (2) is made of metal wire, which is wound into a spring with a diameter of 3-5mm, a pitch of 3-5mm and a length of 25-40mm by winding a metal wire with a diameter of 0.35-0.5mm. The spring is evenly spread in the mold cavity and pressed on a press to form a metal wire pad with a porosity of 55-70%, a thickness of 3-7mm, and a molding pressure of 15-25MPa. The metal wire pad is then taken out for use.

[0006] Brazing method: The metal substrate (1) is heated to 680°C-700°C by an induction coil, and flux is applied to the surface. 45% silver solder is melted on the surface of the metal substrate, and the prepared metal wire pad is placed on the solder, and a pressure of 9-15 MPa is applied. After natural cooling (or water cooling), it is taken out. At this time, the metal wire pad is firmly combined with the metal substrate, less than half of the metal wire pad is soaked with solder, and the upper part has a porosity of 55-70%.

[0007] Modified polyetherketone plastic bearing surface (3) is made of: A. modified polyetheretherketone (PEEK) by weight: PEEK 60-80%, PTFE 5-15%, carbon fiber 10-30%; B. modified polyetherketone (PEK) by weight: PEK 60-80%, aramid fiber 20-40%; C. modified polyaryletherketone (PAEK) by weight: PAEK 70-80%, carbon fiber (or glass fiber) 20-30%; One of the modified composite materials A, B, and C is made into a modified polyetherketone plastic (3).

[0008] The production of the sliding bearing metal wire composite layer (5) and the modified polyether ketone plastic bearing surface (3) is as follows: the prepared metal substrate and the metal wire pad welded together by hard soldering are placed in an injection mold, the mold is heated to 175°C-200°C, the prepared modified polyether ketone plastic is placed in an injection molding machine, and the modified polyether ketone plastic is injected into the metal wire pad so that the material fills the pores and forms a modified polyether ketone plastic layer of a certain thickness on the surface, the nozzle temperature is 370°C-400°C, the injection pressure is 60MPa-90MPa, and the wire pad is naturally cooled to room temperature and taken out, and later processed to the corresponding size according to the drawing requirements.

[0009] The metal wire layer of the present invention plays a connecting role and can effectively absorb the stress change caused by the difference in linear expansion coefficients of various materials, thereby avoiding the separation of the PEEK material from the metal matrix and the cracking of the PEEK material itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the present invention.

[0011] In the figure: 1. metal matrix, 2. metal wire connection. transition layer, 3. modified polyether ketone plastic bearing surface, 4. metal wire and solder composite layer, 5. modified polyether ketone plastic and metal wire composite layer.

[0012] Specific implementation plan (taking PEEK plastic as an example) A brazing composite multilayer modified polyetherketone composite sliding bearing and a manufacturing method thereof, characterized by comprising the following steps:

[0013] The bearing base (1) is machined to a certain size according to the drawing requirements, leaving a certain finishing allowance.

[0014] Processing of metal wire connection transition layer: Wind a metal wire with a diameter of 0.4mm into a spring with a diameter of 4mm, a pitch of 4mm and a length of 30mm. Evenly spread the spring in the mold cavity and press it into a metal wire pad with a porosity of 65%, a thickness of 4.5mm and a molding pressure of 22MPa on a press. Then take out the metal wire pad for use.

[0015] Brazing method: The metal substrate (1) is heated to 685°C by an induction coil, and flux is applied to the surface. 45% silver solder is melted on the surface of the metal substrate, and the prepared metal wire pad is placed on the solder, and a pressure of 9 MPa is applied. After natural cooling (or water cooling), it is taken out. At this time, the metal wire pad is firmly combined with the metal substrate, less than half of the metal wire pad is soaked with solder, and the upper part has a porosity of 65%.

[0016] Production of modified polyether ketone plastic bearing surface (3): modified polyether ether ketone (PEEK) is uniformly mixed in a weight percentage of PEEK 75%, PTFE 10%, and carbon fiber 15% to serve as a raw material for manufacturing modified polyether ketone plastic (3).

[0017] . Preparation of the modified polyether ketone plastic and metal wire composite layer (5) and the modified polyether ketone plastic bearing surface (3): Place the prepared metal substrate and the metal wire pad welded together by hard brazing into an injection mold, heat the mold to 200°C, place the prepared modified polyether ketone plastic into an injection molding machine, inject the modified polyether ketone plastic into the metal wire pad so that the material fills the pores and forms a 4mm modified polyether ketone plastic layer on the surface, the nozzle temperature is 380°C, the injection pressure is 70MPa, and it is naturally cooled to room temperature and taken out.

[0018] Later, it will be processed to the corresponding size according to the drawing requirements.

Claims

1. A brazing composite multilayer modified polyetherketone plastic sliding bearing, which is composed of a bearing base (1), a metal wire connecting transition layer (2) and a modified polyetherketone plastic bearing surface (3), characterized in that: The metal wire connection transition layer (2) is a wire pad with a certain porosity formed by winding metal wire into a spring and pressing it, which is welded to the surface of the metal substrate by a brazing method, wherein a part of the metal wire connection transition layer (3) is filled with solder to form a metal wire and solder composite layer (4), and the remaining part of the metal wire connection transition layer is formed by applying modified polyether ketone plastics into the pores of the metal wire layer by an injection molding method to form a modified polyether ketone plastics and metal wire composite layer (5).

2. A brazing composite multilayer modified polyetherketone plastic sliding bearing and a manufacturing method thereof, characterized by comprising the following steps: (1) Preparation of metal wire pad: The metal wire connecting transition layer (2) is made of metal wire. A metal wire with a diameter of 0.35-0.5 mm is wound into a spring with a diameter of 3-5 mm, a pitch of 3-5 mm, and a length of 25-40 mm. The spring is evenly spread in the mold cavity and pressed on a press to form a metal wire pad with a porosity of 55-70% and a thickness of 3-7 mm. The molding pressure is 15-25 MPa, and the metal wire pad is then taken out for use; (2) Brazing method: The metal substrate (1) is heated to 680℃-700℃ by an induction coil, and flux is applied to the surface. 45 silver solder is melted on the surface of the metal substrate, and the prepared metal wire pad is placed on the solder, and a pressure of 9-15MPa is applied. After natural cooling (or water cooling), it is taken out. At this time, the metal wire pad is firmly combined with the metal substrate, less than half of the metal wire pad is soaked with solder, and the upper part has a porosity of 55-70%; (3) Modified polyether ketone plastic bearing surface (3) Production: A. Modified polyether ether ketone (PEEK) by weight: PEEK 60-80%, PTFE 5-15%, carbon fiber 10-30%; B. Modified polyether ketone (PEK) by weight: PEK 60-80%, aramid fiber 20-40%; C. Modified polyaryletherketone (PAEK) by weight: PAEK 70-80%, carbon fiber (or glass fiber) 20-30%; One of the modified composite materials A, B, and C is made into a modified polyetherketone plastic (3); (4) Preparation of sliding bearing wire composite layer (5) and modified polyether ketone plastic bearing surface (3): Place the prepared metal substrate and the wire pad welded together by hard soldering into an injection mold, heat the mold to 175°C-200°C, place the prepared modified polyether ketone plastic into an injection molding machine, inject the modified polyether ketone plastic into the wire pad so that the material fills the pores and forms a modified polyether ketone plastic layer of a certain thickness on the surface, the nozzle temperature is 370°C-400°C, the injection pressure is 60MPa-90MPa, and the mixture is naturally cooled to room temperature and taken out, and later processed to the corresponding size according to the drawing requirements.

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