WO2022095112A1

WO2022095112A1 - Slider manufacturing method, slider and textile machine using same

Info

Publication number: WO2022095112A1
Application number: PCT/CN2020/129022
Authority: WO
Inventors: 张尧宗; 张官泽
Original assignee: 三阳纺织有限公司
Priority date: 2020-11-05
Filing date: 2020-11-16
Publication date: 2022-05-12
Also published as: CN112453407A; CN112453407B

Abstract

A slider manufacturing method, comprising: manufacturing a bi-material or multi-material planar slider, such as a sliding bearing of a textile machine, by using a powder metallurgy method; using a second powdered material as a powdered raw material of a supporting material layer, and using a first powdered material as a raw material of a working material layer; laying the materials in sequence such that the second powdered material is below the first powdered material; placing a sheet that is of an undulating structure and is made of a thermally decomposable material between the second powdered material and the first powdered material as an interface construction template, wherein the interface construction template can be removed between the second powdered material and the first powdered material by means of degassing pre-sintering or degreasing, and after the interface construction template is removed, the second powdered material and the first powdered material are respectively metallurgically sintered to form the supporting material layer and the working material layer; and forming a non-linear interface structure corresponding to the undulating structure of the interface structure template in shape at a sintered interface of the supporting material layer and the working material layer. The method requires neither separate compaction of the powders nor the addition of an individual operating procedure for processing the interface.

Description

Manufacturing method of sliding member, sliding member and textile machine using the sliding member

technical field

The invention relates to the technical field of manufacturing of mechanical sliding parts, in particular to a manufacturing method of a sliding part, a sliding part and a textile machine using the sliding part.

Background technique

Plane sliding parts such as sliding bearings are parts used to withstand sliding friction in mechanical equipment. They can adapt to low-speed and heavy-load working conditions. They can be installed in special operating parts of mechanical equipment that are inconvenient to operate and maintain, especially those with self-lubricating ability. Bearings are widely used as friction pairs in textile machinery because they avoid the use of lubricating oil.

Many plane bearings with self-lubricating ability are bi-material or multi-material bearings, that is, they include a support material layer that acts as a support and at least one working material layer that acts as a friction lubricator, so they can also be made by powder metallurgy processes. In the process, the iron-based powder material is used as the powder raw material for the support material layer, and the copper-based powder material with self-lubricating ability is used as the raw material for the working material layer. The powder raw material of the working material layer is on top, cold-pressed into a preform and then sintered, or sintered under pressure, solidified and formed into a bi-material or multi-material bearing blank product, which is processed into a finished product through subsequent machining.

The plane sliding parts listed above, in the powder metallurgy process operation, in addition to ensuring that the selected powder material is matched with the desired coefficient of friction, and the sintering parameters are matched with the material properties, but also through the interface between the two different powders. Preliminary physical or chemical treatment to ensure the sintered bond strength of dissimilar material interfaces, such as proper interfacial occlusion to reduce the risk of interlayer bond failures, and to block the extension paths of cracks or brittle intermediates. The current pretreatment of material interfaces tends to have a large impact on the implementation procedure of the powder metallurgy process, for example having to press the powder separately or having to add a separate procedure for the treatment of the interface.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems, the present invention provides a manufacturing method of a sliding member, which can manufacture an interface structure on a sintered bi-material or multi-material interface through a simplified interface manufacturing process, especially for manufacturing such as a sliding bearing for textile machinery part.

The purpose of the present invention is achieved through the following technical solutions.

A method for manufacturing a sliding member, which adopts a powder metallurgy method to manufacture a bi-material or multi-material planar sliding member, at least including:

Use the second powder material as the powder raw material of the support material layer, use the first powder material as the raw material of the working material layer, and spread the materials in order, the second powder material as the powder raw material of the supporting material layer is below, and the first powder as the raw material of the working material layer The material is above, and an interface construction template is placed between the second powder material and the first powder material, and the interface construction template is a thin plate made of a thermally decomposable material with an undulating structure, which can be divided into Gas pre-burning or debinding is removed between the second powder material and the first powder material, and after removal of the interface build-up template, the second powder material and the first powder material are individually metallurgical Sintering to form a support material layer and a working material layer, and forming a non-linear interface structure corresponding to the undulating structure shape of the interface structure template at the sintered interface of the support material layer and the working material layer;

Wherein, in the described orderly paving:

The laid second powder material and the first powder material are both non-bonded powders, and after the second powder material, the interface structure template, and the first powder material are laid in sequence, pressurization, degassing, pre-firing and sintering are performed. , the interface structure template is decomposed during the degassing and pre-burning process; or, both the laid second powder material and the first powder material are mixed with a binder, and the second powder material and the interface structure are mixed together. After the template and the first powder material are laid in sequence, degreasing and sintering are performed. During the degreasing process, the interface structure template is decomposed and removed together with the binder.

In the above-mentioned manufacturing method of a sliding member, when the interface structural template is removed by the degassing and pre-burning method, the degassing and pre-burning temperature is not higher than 600°C; When the interface constructs the template, the degreasing temperature is not higher than 600°C.

In the above-mentioned manufacturing method of a sliding part, when the interface structure template is removed by the degassing and pre-firing method, the processes of pressurization, degassing pre-firing and sintering are carried out in a hot pressing mold; when When the interface structure template is removed by the degreasing method, the process of degreasing and sintering is carried out in a hot pressing mold; the hot pressing mold structure includes an upper template, a lower template and a mold sleeve, the upper template, the lower template and the The mold covers the powder raw material feeding cavity and the forming cavity of the sliding part.

In the above-mentioned method for manufacturing a sliding piece, the die sleeve is machined with vent holes.

A method of manufacturing a sliding part as described above, applying pressure to compact the powder carrier in the hot-pressing mold before performing the degassing pre-burning or the degreasing procedure, and then performing the degassing and pre-burning. Or during the degreasing procedure, the pressure loaded on the hot-pressing die is not more than 20 MPa, and after the degassing and pre-burning or the degreasing procedure is completed, the pressure is increased to perform sintering.

A method of manufacturing a sliding part as described above, the laid second powder material is Fe-based alloy powder or Fe-based mixed powder, and the laid first powder material is Fe-based self-lubricating material powder or Cu-based self-lubricating material powder.

In the above-mentioned manufacturing method of a sliding member, the manufacturing material of the interface structure template contains an organic polymer.

In the above-mentioned manufacturing method of a sliding member, the organic polymer includes one or more of polyethylene, polypropylene, polyvinyl chloride, and polystyrene.

The present invention also provides a sliding member, which is manufactured by the above-mentioned method.

The present invention also provides a textile machine, which includes a sliding bearing, and the sliding member as described above is used in the sliding bearing.

The beneficial effects of the present invention are:

The present invention provides a method for manufacturing a sliding member, which can manufacture an interface structure on a sintered bi-material or multi-material interface through a simplified interface manufacturing process, and can especially be used to manufacture the plane sliding components listed above, such as a sliding bearing component of a textile machine. piece. By using the second powder material as the support material layer powder raw material and the first powder material as the working material layer raw material, a thermally decomposable material having an undulating structure is placed between the second powder material and the first powder material. an interface construction template that can be removed between the second powder material and the first powder material by degassing, burn-in or degreasing, and after removal of the interface construction template, the second powder material and the first powder material are each Metallurgical sintering forms a supporting material layer and a working material layer, and a non-linear interface structure corresponding to the undulating structure shape of the interface structure template is formed at the sintering interface of the supporting material layer and the working material layer. With proper interface occlusion to reduce the risk of interlayer bonding failure, and to block the extension path of cracks or brittle intermediate products, the method of the present invention has basically no effect on the implementation procedure of the powder metallurgy process. Naturally in the degassing or debinding procedure, without the need for separate compaction of the powders, and without adding a separate operating procedure for the interface treatment, through the operation of the hot pressing process (such as pressure loading and in the degassing preburning or debinding procedure exhaust), products with the same density and qualified mechanical properties as the conventional process can be obtained.

Description of drawings

FIG. 1 is a schematic structural diagram of an interface construction template used in the methods of various embodiments of the present invention.

FIG. 2 is a schematic diagram of the usage principle of the interface construction template adopted in the methods of various embodiments of the present invention.

FIG. 3 is a schematic diagram of the principle of performing process operations in a hot pressing mold in the methods of various embodiments of the present invention.

FIG. 4 is a schematic diagram showing the principle of performing a process operation in a hot pressing mold of another configuration in the method of various embodiments of the present invention.

The components represented by each reference number in the figure are:

The first powder material-1, the second powder material-2, the interface structure template-3, the upper template-4, the lower template-5, the mold sleeve-6, the exhaust hole-7.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

Example 1

Referring first to FIG. 3 , in this embodiment, in the hot pressing mold shown in FIG. 3 , a powder metallurgy method is used to manufacture a bi-material or multi-material planar sliding member, which is used as a sliding bearing in textile machinery. The hot-pressing die structure includes an upper die plate 4, a lower die plate 5 and a die sleeve 6, and the upper die plate 4, the lower die plate 5 and the die sleeve 6 enclose a powder feed cavity and a molding cavity of the sliding piece.

Referring to FIGS. 1 to 3 , the manufacturing method of the above-mentioned sliding member includes: using the second powder material 2 as the powder raw material of the support material layer, using the first powder material 1 as the raw material of the working material layer, and laying the materials in sequence as the powder material of the support material layer The second powder material 2 of the raw material is at the bottom, the first powder material 1 as the raw material of the working material layer is above, and an interface construction template 3 is placed between the second powder material 2 and the first powder material 1, and the The interface structure template 3 is a thin plate made of a thermally decomposable material with an undulating structure (here the thin plate is in principle selected to have a thickness of 1.5 mm or less, preferably 0.5 mm or less). The material 2 and the first powder material 1 are removed, and after the interface construction template 3 is removed, the second powder material 2 and the first powder material 1 are individually metallurgically sintered to form a support material layer and a working material layer, a non-linear interface structure corresponding to the undulating structure shape of the interface structure template 3 is formed at the sintered interface of the support material layer and the working material layer. Corresponding to the “method of degassing and pre-burning” in this embodiment, in the sequential laying: the laid second powder material 2 and the first powder material 1 are both non-bonded powders. After the second powder material 2 , the interface structure template 3 , and the first powder material 1 are laid in sequence, pressurization, degassing and pre-burning and sintering are performed, and the interface structure template 3 is decomposed during the degassing and pre-burning process.

The final temperature of the degassing and pre-burning in this embodiment is based on the fact that the interface structural template 3 can be completely decomposed. The manufacturing material of the interface structural template 3 preferably contains an organic polymer, and the organic polymer includes polyethylene and polypropylene. , one or more of polyvinyl chloride and polystyrene, and its thermal decomposition temperature is generally not higher than 600 ° C. In addition, the mass fraction of not less than 5% and not more than 30% of low melting point main material is added to the organic material. The element powder (ie, the main element with relatively low melting point in the second powder material 2 and the first powder material 1) can well promote the fusion of the two-phase materials under the premise of controlling the organic amount.

As shown in FIG. 3 , the processes of pressurization, degassing and pre-sintering and sintering in this embodiment are all performed in a hot-pressing mold. Before the degassing and pre-sintering process is performed, pressure is applied to pack the powder in the hot-pressing mold. The carrier is compacted. When the degassing and pre-sintering procedure is performed, the pressure loaded on the hot-pressing die is not more than 20 MPa. After the degassing and pre-sintering procedure is completed, the pressure is increased to perform sintering.

As an example but not a limitation for further improvement, as shown in FIG. 4 , vent holes 7 can be machined on the mold sleeve 6 of the hot-pressing mold. The exhaust hole 7 can be a structure with one main channel and several sub-channels as shown in the figure.

Verification Example 1

In the Fe-based alloy powder containing copper (about 25wt%) and tin (about 15wt%), a lubricant (graphite) accounting for 8wt% of the Fe-based alloy powder was added as the first powder material 1, and the carbon content was about 0.4wt% And iron-based alloy powder containing about 0.3wt% of silicon and about 0.6wt% of manganese is used as the second powder material 2, the interface structure template 3 is selected as a polyvinyl chloride sheet with a thickness of about 0.4mm, and the degassing and pre-burning temperature is 280 ℃, Sintering was carried out according to the method of Example 1 at a final sintering temperature of about 900° C. for 3 hours, with a maximum pressure applied during this period of 50 MPa. Finally, a planar sliding part product with a density of about 98% can be obtained, and the non-linear interface structure at the material interface is uniform in shape.

Example 2

Still referring to Fig. 1-Fig. 4, this embodiment is basically the same as the preparation target, the hot-pressing mold used and the process used in the embodiment 1, and the interface structure template 3 used is also the same, the difference is that in the In the sequential laying described above, the laid second powder material 2 and the first powder material 1 are mixed with a binder with a volume content of 8%. After a powder material 1 is laid in sequence, degreasing and sintering are performed. During the degreasing process, the interface construction template 3 is decomposed and removed together with the binder.

The final temperature of the above degreasing process in this embodiment is based on the ability to completely decompose the binder and the interface structure template 3, and in this embodiment, the processes of pressurization, degreasing and sintering are all performed in a hot pressing mold. Apply pressure to compact the powder carrier in the hot-pressing mold before performing the degreasing procedure. During the degreasing procedure, the pressure loaded on the hot-pressing mold does not exceed 20 MPa. After the degreasing procedure is completed , increase the pressure, and perform sintering. In this embodiment, the hot-pressing die with the vent hole 7 shown in FIG. 4 is preferably selected.

Verification example 2

In Fe-based alloy powder containing copper (about 25wt%) and tin (about 15wt%), a lubricant (graphite) accounting for 8wt% of Fe-based alloy powder is added as the first powder material 1, and phenolic resin is added with a volume content of 8% As the second powder material 2, the phenolic resin-based adhesive is added with a volume content of 8% by using an iron-based alloy powder with a carbon content of about 0.4 wt% and containing about 0.3 wt% of silicon and about 0.6 wt% of manganese as the second powder material 2. Binder, interface structure template 3 selects a polyvinyl chloride sheet with a thickness of about 0.4mm, the degreasing temperature is 500°C, and the final sintering temperature of about 900°C is sintered for 3 hours according to the method of Example 2, and the maximum pressure applied during the period is 50MPa. Finally, a planar sliding part product with a density of more than 97% can also be obtained, and the non-linear interface structure at the material interface is uniform in shape.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A method for manufacturing a sliding member, adopting a powder metallurgy method to manufacture a bi-material or multi-material planar sliding member, characterized in that it at least comprises:

The second powder material (2) is used as the powder raw material for the support material layer, the first powder material (1) is used as the raw material for the working material layer, and the materials are spread in order, and the second powder material (2) as the powder raw material for the support material layer is below, The first powder material (1) as the raw material of the working material layer is on top, and an interface construction template (3) is placed between the second powder material (2) and the first powder material (1), the interface The construction template (3) is a thin plate made of a thermally decomposable material with an undulating structure, which can be degassed, pre-fired or degreased between the second powder material (2) and the first powder material (1). ), and after removing the interface construction template (3), the second powder material (2) and the first powder material (1) are individually metallurgically sintered to form a support material layer and a working material layer, and the A non-linear interface structure corresponding to the undulating structure shape of the interface structure template (3) is formed at the sintering interface of the support material layer and the working material layer;

Wherein, in the described orderly paving:

The laid second powder material (2) and the first powder material (1) are both non-bonded powders, and after combining the second powder material (2), the interface construction template (3), the first powder material (1) ) After the laying is completed in sequence, pressurization, degassing pre-firing and sintering are performed, and the interface construction template (3) is decomposed during the degassing prefiring process; or, the laid second powder material (2) and the first A powder material (1) is mixed with a binder, and degreasing and sintering are performed after the second powder material (2), the interface construction template (3), and the first powder material (1) are laid in sequence. During the degreasing process, the interface construction template (3) is decomposed and removed together with the binder.
The method for manufacturing a sliding member according to claim 1, wherein when the interface structural template (3) is removed by the degassing and pre-burning method, the degassing and pre-burning temperature is not higher than 600 °C °C; when the interface construction template (3) is removed by the degreasing method, the degreasing temperature is not higher than 600 °C.
The method for manufacturing a sliding member according to claim 1, characterized in that, when the interface structural template (3) is removed by the degassing and pre-firing method, the pressurizing, degassing prefiring and sintering are performed. The process of degreasing is carried out in a hot pressing mold; when the interface construction template (3) is removed by the degreasing method, the process of degreasing and sintering is carried out in a hot pressing mold; the above-mentioned hot pressing mold structure includes an upper template (4). ), a lower die plate (5) and a die sleeve (6), the upper die plate (4), the lower die plate (5) and the die set (6) enclose the powder feed cavity and the molding cavity of the sliding part.
The method for manufacturing a sliding piece according to claim 3, characterized in that, an exhaust hole (7) is processed on the die sleeve (6).
The method for manufacturing a sliding part according to claim 3, wherein, before the degassing and pre-burning or the degreasing procedure is performed, pressure is applied to compact the powder carrier in the hot-pressing mold, and When performing the degassing and pre-burning or the degreasing procedure, the pressure loaded on the hot-pressing mold is not more than 20 MPa. After the degassing and pre-burning or the degreasing procedure is completed, the pressure is increased to perform sintering.
The method for manufacturing a sliding member according to claim 1, wherein the laid second powder material (2) is Fe-based alloy powder or Fe-based mixed powder, and the laid first powder material (1) It is Fe-based self-lubricating material powder or Cu-based self-lubricating material powder.
The method for manufacturing a sliding member according to claim 1, characterized in that, the manufacturing material of the interface structure template (3) contains an organic polymer.
The method for manufacturing a sliding member according to claim 7, wherein the organic polymer comprises one or more of polyethylene, polypropylene, polyvinyl chloride, and polystyrene.
A sliding part is manufactured by the method of any one of claims 1-8.
A textile machine includes a sliding bearing, wherein the sliding element of claim 9 is used in the sliding bearing.