CN112958768A - Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method - Google Patents
Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method Download PDFInfo
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- CN112958768A CN112958768A CN202110125504.6A CN202110125504A CN112958768A CN 112958768 A CN112958768 A CN 112958768A CN 202110125504 A CN202110125504 A CN 202110125504A CN 112958768 A CN112958768 A CN 112958768A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
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Abstract
The invention relates to a manufacturing process for producing a bimetallic sliding bearing by adopting a radial reaming method, which comprises the steps of installing a core rod with steps into a through hole of a steel sleeve for core assembly, firstly installing a powder metallurgy material into a cavity, sintering at a low temperature to preliminarily combine powder particles of the powder metallurgy material through solid phase diffusion to form a powder layer, and taking out the core rod; inserting a radial expansion assembly, axially moving a shaft core with a taper by applying force, forcing an expansion sleeve to radially extrude a powder layer, and improving the powder molding density in a powder area by continuously applying force; and (5) performing high-temperature sintering. The invention not only improves the powder loading amount, but also improves the powder forming density, simultaneously strengthens the combination tightness between the powder inner layer and the outer layer steel sleeve of the sliding bearing, avoids the abrasion or the pollution to the powder area caused by directly pressing the powder area by the shaft core, can improve the bearing capacity, the impact resistance, the service life and the applicability of the product, and is beneficial to reducing the cost.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to a manufacturing process for producing a bimetallic sliding bearing by adopting a radial reaming method.
Background
The application functions of the sliding bearing applied to different fields are different, and the effects brought to different fields are different. The technical scheme of the invention relates to a manufacturing process of a bimetallic sliding bearing for the field of powder metallurgy, which is used for forcing the axial movement by applying pressure to realize expansion and extrusion from the radial direction.
Before developing research on manufacturing processes, researchers in the technical scheme of the invention firstly carry out the similar techniques in the past and carry out the operation of the similar techniques, thereby summarizing the common problems and the respective disadvantages of the methods for producing the bimetallic sliding bearing by various manufacturing processes, and the methods comprise the following steps:
the manufacturing process comprises the steps of firstly sintering, rolling, secondly sintering and then rolling or welding and reprocessing to produce the thin-wall composite sliding bearing. However, copper, tin and lead element materials are soft, poor in impact resistance and weak in bearing capacity, are not suitable for the heavy-load field, and lead is not environment-friendly; meanwhile, the liquid antifriction lubricating oil cannot be stored, the friction coefficient is large, and the service life is short. Therefore, the traditional process of sintering by spreading powder on a metal plate can not meet the working performance of the existing powder metallurgy bimetal sliding bearing.
The method not only does not overcome the defects of the powder tiling method, but also does not overcome the defects of the powder tiling method because the bonding layer is only bonded on the inner wall of the steel sleeve instantly through the heat energy of molten metal such as copper and the like. After that, some technicians electroplate a layer of materials such as copper on the inner wall of the steel sleeve in order to improve the bonding strength, but the implementation has high electroplating cost, pollutes the environment and wastes a large amount of nonferrous metals; in addition, as can be seen from experiments, technicians are not suitable for adding iron element metal for improving the bearing capacity and the impact resistance in a large proportion, so that the binding force is reduced. Obviously, if the production process of the thick-wall bimetal sliding bearing is adopted, the requirement of the existing and future powder metallurgy industries on the excellent working performance of the sliding bearing cannot be met.
The steel sleeve and the powder metallurgy layer are combined and sintered, the outer diameter of the powder metallurgy layer is smaller than the inner diameter of the steel sleeve during combination, a large gap exists, the sintering combination utilizes the thermal expansion principle of the material of the powder metallurgy layer, but the sintering expansion is affected by different materials, uniform density of a formed green body, different expansion after demoulding of the formed green body, different sizes of the gap, non-uniform sintering deformation during sintering, cleanness degrees of the inner wall of the steel sleeve and the outer wall of the powder metallurgy layer, different gas and air pressure in a sintering furnace, non-uniform temperature of the sintering furnace and other factors, so that the bonding layer after sintering is easy to have the gap, or the sintering bonding strength is not high, the large-scale application is not realized, and the high-strength occasion cannot be applied.
Furthermore, the prior art may adopt a method of pressing and sintering the green compact and then re-processing, which mainly relies on heating to perform solid phase diffusion between the powder and the steel sleeve to bond the powder and the steel sleeve, but practical application of the method also finds that the method has the same defects as the above manufacturing process, for example, the bonding force is too small to be applied to high-strength occasions, and the cost is too high if the method of re-processing the green compact after sintering and then combining and sintering is adopted; for another example, in the production process of the process, the steel sleeve needs to be plated with a layer of materials such as copper on the inner wall to facilitate combination, so that the plating cost is high, and the environment is polluted; for another example, when the process is adopted for production, because the thermal coefficients of the powder metallurgy material and the steel sleeve material are different, the internal stress is too large during heat treatment, the bonding layer is very easy to crack, and the cost of the product manufactured by the process is higher than that of the whole powder metallurgy. In sum, the above manufacturing processes cannot be applied in large scale, and even in high strength applications.
After the conventional method for manufacturing the bimetallic sliding bearing is subjected to jostling and analysis, the research and development personnel of the technical scheme summarize the current situation of the traditional method for manufacturing the powder metallurgy oil-retaining bearing with similar manufacturing process, generally, metal powder is loosely loaded into a die cavity, a punch enters the die cavity, the metal powder is compacted to reach the required density, a pressed green body is removed from the die, and then the next product pressing and forming cycle is carried out; the manufacturing process mainly comprises the steps of manufacturing a die, filling powder, pressing, sintering at high temperature, soaking in oil and the like, but the manufactured product has poor bearing capacity and is easy to crack when being applied to a heavy-load occasion, has poor deformation resistance and easy edge cracking when being applied to a swinging occasion, and particularly has poor toughness, large brittleness and poor impact resistance after being subjected to heat treatment.
In combination with the above analysis of the common defects and drawbacks of the similar techniques, it is known that the sliding bearing applied to the field of powder metallurgy cannot be optimized and innovated only from a single direction such as a mechanical structure or a raw material. The present invention provides a manufacturing process of a bimetallic sliding bearing by a radial reaming method, wherein in the manufacturing process, a core rod with steps is firstly used for improving the powder loading amount so as to strengthen the solid phase diffusion between powder particles by low-temperature sintering, then an reaming component comprising a shaft core with a taper and a reaming sleeve is used for applying axial pressure or pulling force to the shaft core so as to axially move the shaft core, so that the reaming sleeve radially extrudes a powder layer, a powder region is stressed to improve the powder forming density so as to strengthen the bonding tightness between the powder inner layer and the outer layer steel sleeve of the sliding bearing, and finally, after high-temperature sintering, the service performance of the product can be improved, The service life and the application range are greatly improved. As can be seen from the production experience of actual investment, the technical scheme provided by the invention can at least alleviate, partially solve or completely solve the problems in the prior art.
Disclosure of Invention
In order to overcome the defects, the invention provides a manufacturing process for producing the bimetallic sliding bearing by adopting a radial reaming method, which comprises the steps of firstly utilizing a core rod with steps to match and improve the powder loading amount so as to apply low-temperature sintering to strengthen solid-phase diffusion among powder particles, then utilizing a reaming assembly comprising a tapered shaft core and a reaming sleeve to apply axial pressure or tension to the shaft core so as to axially move the shaft core, so that the reaming sleeve radially extrudes a powder layer, and improving the powder forming density in a powder area by stress so as to strengthen the combination tightness between a powder inner layer and an outer layer steel sleeve of the sliding bearing, so that after high-temperature sintering, the bearing capacity, the impact resistance, the service life and the applicability of a product can be improved, the cost can be favorably reduced, and the hidden danger of environmental pollution can be overcome.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing process for producing a bimetallic sliding bearing by adopting a radial reaming method adopts an inner diameter through hole steel sleeve or an inner diameter step steel sleeve for die assembly, and manufactures the bimetallic sliding bearing used in the field of powder metallurgy according to corresponding steps, and comprises the following steps:
firstly, a stepped core rod is arranged in a through hole of a steel sleeve for core assembly, and a cavity for filling powder metallurgy materials is formed between the outer wall surface of the stepped core rod and the inner wall surface of the steel sleeve;
II, firstly filling the powder metallurgy material into the cavity, and then increasing the powder filling amount in a vibration or knocking mode, wherein the end part of the core rod with the step is provided with the step part and is blocked at one end of the steel sleeve in a closed mode, so that the filling density of the powder metallurgy material filled in the area adjacent to the one end is increased;
III, entering a low-temperature sintering link, preliminarily combining powder particles of the powder metallurgy material through solid phase diffusion to form a powder layer, and taking out the core rod with the step;
inserting a radial expansion assembly, wherein the radial expansion assembly comprises an expansion sleeve which is directly contacted with the surface of a powder layer, the inner diameter of the powder layer is assembled with the outer diameter of the expansion sleeve, a shaft core with a taper is coaxially arranged in the expansion sleeve, the shaft core with the taper is axially moved by applying pressure or pulling force to force the expansion sleeve to radially extrude the powder layer, and a powder area is subjected to continuous stress to improve the powder molding density and strengthen the tightness of the combination of the powder layer and a steel sleeve;
v, taking out the radial expansion assembly from the through hole of the steel sleeve;
VI, sintering the bearing product sequentially subjected to the manufacturing steps at high temperature to form the bimetallic sliding bearing.
Through the technical solutions implemented above, on the basis of the same conception, a skilled person can adopt corresponding technical means to form a corresponding technical solution additionally, and the technical means include:
wherein, the expanding sleeve adopts a petal type taper sleeve which is provided with at least one gap; furthermore, the taper of the inner hole of the petal-type taper sleeve is the same as the taper of the taper surface of the tapered shaft core, so that the outer circle of the petal-type taper sleeve is forced to expand by the tapered shaft core under the action of pressure or pulling force.
Wherein the sintering temperature in the step VI is not lower than the sintering temperature of III;
wherein, the wall thickness of the powder layer formed by filling the powder metallurgy material is not less than the wall thickness of the powder layer after pressing;
wherein the powder or particles are mostly radially displaced after being pressurized by the radial expansion assembly.
Furthermore, the skilled person may also prefer materials in connection with different application requirements, such as:
the adopted shaft core with the taper is made of metal materials, has certain hardness after heat treatment, and is selected to be HRC 40-75 degrees.
As another example, the powder or granular material of the powder layer contains one or more elements having a melting point lower than that of iron.
In the production steps of the invention, firstly, a core rod with steps is matched with a steel sleeve to assemble the core to improve the powder loading amount, then low-temperature sintering is carried out to strengthen the solid phase diffusion among powder particles, and then a hole expanding component comprising a shaft core with taper and a hole expanding sleeve is utilized, axial pressure or pulling force is applied to the shaft core to axially move the shaft core, so that the reaming sleeve radially extrudes the powder layer, the powder region is continuously stressed to improve the powder forming density, and meanwhile, the bonding tightness between the powder inner layer and the outer layer steel sleeve of the sliding bearing can be strengthened, and abrasion or contamination of the powder region due to direct pressing of the shaft core against the powder region is avoided, the manufacturing process can improve the bearing capacity, the impact resistance, the service life and the applicability of the product, is favorable for reducing the cost and overcomes the hidden trouble of environmental pollution.
In addition, when the process method or some expanding technical means are combined for production practice, the production of the powder metallurgy bimetallic sliding bearing without obvious density deviation and over-length is facilitated, the high-strength and impact-resistant powder metallurgy bimetallic sliding bearing is produced, the powder metallurgy bimetallic sliding bearing under the heavy-load condition is produced, the powder metallurgy bimetallic sliding bearing with lower production cost is produced, and the powder metallurgy bimetallic sliding bearing with a steel layer and a powder layer which have stronger bonding force is produced.
Drawings
The invention is explained in further detail below with reference to the drawing.
Fig. 1 is a schematic view of the manufacturing process of the bimetallic sliding bearing by radial reaming method according to the present invention, which is implemented in the state that after the tapered shaft core and other components are installed, the shaft core is moved axially by pressure to make the expansion sleeve press the powder layer;
fig. 2 is a schematic view showing a state in which an expansion sleeve is pressed against a powder layer by applying a tensile force to axially move a tapered shaft core after the assembly such as the shaft core is assembled in a manufacturing process for producing a bimetallic sliding bearing by a radial broaching method according to the present invention;
FIG. 3 is a schematic view showing the state of the assembly of the steel bushing with inner diameter through holes and the core rod with steps in the manufacturing process of the bimetallic sliding bearing by the radial reaming method according to the present invention;
FIG. 4 is a schematic view showing the state of the assembly of the inner diameter stepped steel sleeve and the stepped mandrel in combination in the manufacturing process of the bimetallic sliding bearing by the radial reaming method according to the present invention;
fig. 5 is a schematic view showing a powder-charged state in a manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to the embodiment of the present invention;
FIG. 6 is a schematic view showing a low-temperature sintering state in a furnace in a manufacturing process for producing a bimetallic sliding bearing by a radial broaching method according to the present invention;
FIG. 7 is a schematic view showing a state where a stepped mandrel is removed in a manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to the present invention;
fig. 8 is a schematic view of a manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to the present invention, which is performed in a state where high-temperature sintering is performed in a furnace.
In the figure:
1. steel jacket;
2. a powder layer;
3. a stepped mandrel; 301. a step portion;
4. a cavity;
5. a steel sleeve with an inner diameter step;
6. a shaft core with a taper;
7. an expansion sleeve;
8. a reaming assembly.
Detailed Description
The technical scheme of the invention is that the manufacturing process for producing the bimetallic sliding bearing by adopting the radial reaming method solves the problems of various performance disadvantages of exposed products in application caused by the fact that the powder loading amount, the powder forming density and the combination tightness between the shaft sleeve and the powder layer cannot be simultaneously ensured in the conventional various sliding bearing manufacturing processes under the condition that the mandrel is not in direct contact with the powder layer, and comprises the defects of poor bearing capacity and easiness in cracking when being applied to a heavy load field, poor deformation resistance and easiness in cracking at the edge when being applied to a swinging field, poor toughness, high brittleness and poor impact resistance after being subjected to heat treatment.
According to the technical scheme, the steel sleeve and components such as the core rod and the shaft core adopted in different processes are combined to perform corresponding sintering operation, so that the improvement of the internal performance of the bearing is developed, and the corresponding technical problem is finally solved. In addition, different schemes can be selected according to design requirements by adopting equipment, the size of a steel sleeve, the material proportion of a powder layer and the like, and the technical scheme of the invention is mainly characterized in that technical means formed after different core rods are added into a production process are utilized, so that the equipment model matching, the component size selection and the like are not improved compared with the conventional technical means, and the equipment can be increased or decreased according to requirements. Obviously, the technical solution of the present invention does not involve selecting what type of model to match, what size to use, and other corresponding technical and conventional means, and those skilled in the art know that it is necessary to additionally refer to some conventional technical means as long as the process of the technical solution of the present invention can be implemented, and those skilled in the art can combine actual design requirements; of course, not limited to the selection of device model, component size, etc. Therefore, the technical solution implemented by the present invention is actually a sliding bearing manufacturing method that can be referred and implemented by those skilled in the art by combining with conventional technical means, and those skilled in the art can actually obtain a series of advantages brought by the manufacturing process formed in the present application by performing actual application and testing according to different application conditions and design requirements, and these advantages will be gradually reflected in the following analysis of the system structure.
The manufacturing process for producing the bimetallic sliding bearing by adopting the radial reaming method implemented by the technical scheme of the invention is obviously different from the production process of the traditional powder metallurgy oil-retaining bearing in specific implementation, is a newly researched production process of the bimetallic sliding bearing, and has the following specific technical means in detail in the implementation process:
as shown in figures 3 and 4, the manufacturing process of the bimetallic sliding bearing by the radial reaming method implemented by the invention comprises the steps of firstly installing the stepped mandrel 3 into the through hole of the steel sleeve 1, thereby combining the steel sleeve 1 and the stepped mandrel 3, wherein the steel sleeve 1 structure can be adopted, the inner diameter through hole steel sleeve (namely the steel sleeve 1) shown in figure 3 and the inner diameter stepped steel sleeve 5 shown in figure 4 are listed, wherein the joint of the end part of the inner diameter stepped steel sleeve 5 is provided with a step structure, therefore, the combination of the inner diameter through hole steel sleeve 1 and the stepped mandrel 3 and the combination of the inner diameter stepped steel sleeve 5 and the stepped mandrel 3 are sequentially formed in figures 3 and 4, no matter which combination state, the subsequent production steps are consistent, and an annular ring-shaped material for installing powder metallurgy materials is formed between the outer wall surface of the stepped mandrel 3 and the inner diameter steel sleeve 1 (or the inner diameter stepped steel sleeve 5) A cavity 4.
As shown in fig. 5-7, the manufacturing process of the bimetallic sliding bearing by radial broaching according to the present invention includes the steps of loading the powder metallurgy material into the annular cavity 4 between the steel sleeve 1 and the stepped mandrel 3, and then increasing the powder loading by vibration, knocking, etc., it is important to point out that the research and development personnel use the stepped mandrel 3 in this step because, when the powder metallurgy material is loaded, the powder metallurgy material is generally loaded from one end of the steel sleeve 1 to the other end along the annular cavity 4 (from top to bottom in the direction shown in the figure), since the step part 301 at the end of the stepped mandrel 3 can form a closed type block at one end of the steel sleeve 1, the loading amount of the powder metallurgy material in the area adjacent to the step part 301 can be ensured and is favorable for increasing the density, obviously, if the stepped mandrel 3 is not used, the block of the step part 301 is absent, the filling amount of one end of the steel sleeve 1 cannot be ensured, and if the filling amount of the powder metallurgy material in the area adjacent to the end cannot be ensured, the bearing product finally produced after the subsequent production steps has poor deformation resistance on the whole, and at least the edge part is easy to crack.
Correspondingly, while ensuring the powder loading and the end part filling amount in the steps, the sintering furnace or other corresponding sintering equipment enters a low-temperature sintering link to enable the powder particles to be preliminarily combined through solid-phase diffusion to form a powder layer 2, and after the whole core rod 3 is cooled, the core rod with the steps is taken out.
As shown in fig. 1, 2 and 8, the manufacturing process of the bimetallic sliding bearing by the radial broaching method implemented by the invention comprises the steps of inserting a matched radial expansion assembly after a low-temperature sintering link and taking out a core rod 3 with a step, wherein the radial expansion assembly comprises an expansion sleeve 7 directly contacted with the surface of a powder layer 2, and assembling the inner diameter of the powder layer 2 and the outer diameter of the expansion sleeve 7 (optionally a petal type taper sleeve), a shaft core 6 with a taper is arranged in the expansion sleeve 7 and is coaxially arranged, a broaching assembly 8 is connected with one end of the shaft core 6 with the taper, and a technician can configure the proper assembly according to the design requirement.
Furthermore, the tapered shaft core 6 can be axially moved by applying pressure or pulling force to one side of the tapered shaft core 6 through the outside, the expansion sleeve 7 is forced to radially press the powder layer 2, the powder region is continuously stressed to improve the powder forming density, the bonding tightness between the powder inner layer and the outer layer steel sleeve of the sliding bearing can be strengthened, and the abrasion or the pollution to the powder region caused by directly pressing the powder region by the shaft core can be avoided.
Correspondingly, continuing with the above steps, the technician removes the tapered mandrel 6 and sinters the product at a corresponding temperature at a high temperature.
According to the manufacturing process for producing the bimetallic sliding bearing by adopting the radial reaming method, the implementation personnel can carry out conventional means such as oil immersion, finishing and shaping, heat treatment, subsequent processing and the like on the sintered product according to different requirements, and the practical application proves that the service performance of the whole product is improved and the service life is prolonged.
In the manufacturing process for producing the bimetallic sliding bearing by the radial reaming method, designers can summarize the corresponding steps adopted by the invention, and the manufacturing process further comprises the following characteristics:
firstly, the adopted radial expansion assembly comprises a combination of a shaft core 6 with taper and a petal type taper sleeve, and if the petal type taper sleeve is adopted, one or more gaps can be arranged for relieving the pressure during expansion; the conicity of the inner hole of the petal-type taper sleeve is the same as that of the taper surface of the shaft core 6 with the taper, so that the shaft core 6 with the taper forces the excircle of the petal-type taper sleeve to expand due to pressure or pulling force.
Secondly, for the molding density (namely, the first molding) of the powder layer 2 formed by filling the stepped core rod 3 with the powder metallurgy material, which is lower than the molding density (namely, the second molding) of the powder layer 2 formed by adopting the expansion and extrusion step, the importance degree of mutual matching of the two links can be seen; the stepped mandrel 3 used for the first forming is made of a non-metal material, such as graphite, ceramic and the like, the tapered mandrel 6 used for the second forming is made of a metal material, and the material is subjected to heat treatment, has certain hardness, and is preferably HRC 40-75 ℃ above HRC15 ℃; the wall thickness of the powder layer (or the particle layer) formed in the first forming is not less than that of the wall thickness formed in the second forming; for the second molding, the powder or particles are mostly radially displaced.
Further, for the two-time sintering, the second-time sintering temperature is at least not lower than the first-time sintering temperature.
The technicians can also apply corresponding technical means by combining with actual requirements, when the product produced by the method is not subjected to heat treatment, the metallographic structure of the outer steel sleeve is ferrite, and the powder layer is ferrite, pearlite and cementite; if the product is subjected to heat treatment (such as high-temperature quenching and carburizing and nitriding quenching), the outer steel sleeve is of a martensite structure, and the powder layer is of a martensite structure and a bainite structure; in addition, the powder or granular material contains one or more elements having a melting point lower than that of iron, such as copper, tin, bismuth, antimony, and the like.
The above manufacturing process for producing a bimetallic sliding bearing by a radial reaming method, which is implemented by the present invention, is applied to practical production, and can at least alleviate, partially solve or completely solve the problems, and comprises the following steps: the problems of poor bearing capacity, poor impact resistance and short service life of the powder metallurgy oil-retaining bearing in the heavy load field are solved; the problems of poor bearing capacity and short service life of the bimetallic sliding bearing in the heavy load field are solved; the bimetallic sliding bearing is easy to deform under the impact condition and has short service life; the problem that graphite, molybdenum disulfide and other antifriction materials cannot be added or are excessively added to the bimetallic sliding bearing by using the centrifugal casting method; the bimetallic sliding bearing can not increase the strength and the wear resistance and prolong the service life by means of heat treatment and the like; in addition, the problem of environmental pollution caused by the use or excessive use of the noble metal, the nonferrous metal and the rare metal in the bimetallic sliding bearing material can be avoided or reduced, the problem of overhigh cost caused by the use or excessive use of the noble metal, the nonferrous metal and the rare metal in the bimetallic sliding bearing material can be avoided or reduced, and the problem that the bimetallic sliding bearing cannot be applied on a large scale due to the unstable manufacturing process can be solved.
Other corresponding technical features implemented by the invention for assisting the implementation of the technical solution can be implemented correspondingly or improved on the basis of the existing conventional technical means by a skilled person, and further details of other related technical means are not described herein.
In the description herein, the appearances of the phrases "embodiment one," "this embodiment," "specific implementation," and the like in this specification are not necessarily all referring to the same embodiment or example, but rather to the same embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example; furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present specification, the terms "connect", "mount", "fix", "set", "have", and the like are used in a broad sense, for example, the "connect" may be a fixed connection or an indirect connection through intermediate components without affecting the relationship and technical effects of the components, or may be an integral connection or a partial connection, as in this case, for a person skilled in the art, the specific meaning of the above terms in the present invention can be understood according to specific situations.
The foregoing description of the embodiments is provided to enable any person skilled in the art to make and use the embodiments, and it is to be understood that various modifications may be readily apparent to those skilled in the art, and that the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present disclosure is not limited to the above embodiments, and modifications to the following cases should be included within the scope of the present disclosure: firstly, a new technical scheme implemented on the basis of the technical scheme of the invention and combined with the prior common knowledge, such as the technical scheme formed by improving the powder loading capacity by using a core rod with steps and improving the molding density by using a shaft core with a taper, and the technical effect generated by the new technical scheme is not beyond the technical effect of the invention; equivalent replacement of part of the characteristics of the technical scheme of the invention by adopting the known technology produces the same technical effect as the invention, for example, equivalent replacement is carried out on conventional production equipment, force application devices and the like used in the process; expanding on the basis of the technical scheme of the invention, wherein the substantial content of the expanded technical scheme does not exceed the technical scheme of the invention; and fourthly, applying the obtained technical means to other schemes in other related technical fields by using equivalent transformation carried out by the text description content or the drawings of the specification.
Claims (10)
1. A manufacturing process for producing a bimetallic sliding bearing by a radial reaming method adopts an inner diameter through hole steel sleeve or an inner diameter step steel sleeve for die assembly, and manufactures the bimetallic sliding bearing used in the field of powder metallurgy according to corresponding steps, and is characterized by comprising the following steps:
firstly, a stepped core rod is arranged in a through hole of a steel sleeve for core assembly, and a cavity for filling powder metallurgy materials is formed between the outer wall surface of the stepped core rod and the inner wall surface of the steel sleeve;
II, firstly filling the powder metallurgy material into the cavity, and then increasing the powder filling amount in a vibration or knocking mode, wherein the end part of the core rod with the step is provided with a step part and is blocked at one end of the steel sleeve in a closed mode, so that the filling density of the powder metallurgy material filled in the area adjacent to the one end is increased;
III, entering a low-temperature sintering link, preliminarily combining powder particles of the powder metallurgy material through solid phase diffusion to form a powder layer, and taking out the core rod with the step;
inserting a radial expansion assembly, wherein the radial expansion assembly comprises an expansion sleeve which is directly contacted with the surface of a powder layer, the inner diameter of the powder layer is assembled with the outer diameter of the expansion sleeve, a shaft core with a taper is coaxially arranged in the expansion sleeve, the shaft core with the taper is axially moved by applying pressure or pulling force to force the expansion sleeve to radially press the powder layer, and a powder area is continuously stressed to improve the powder forming density and strengthen the tightness of the combination of the powder layer and the steel sleeve;
v, taking out the radial expansion assembly from the through hole of the steel sleeve;
VI, sintering the bearing product sequentially subjected to the manufacturing steps at high temperature to form the bimetallic sliding bearing.
2. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 1, wherein: the expansion sleeve adopts a petal type taper sleeve.
3. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 1, wherein: and the sintering temperature of the step VI is not lower than the sintering temperature of III.
4. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 1, wherein: the wall thickness of the powder layer formed by filling the powder metallurgy material is not less than that of the powder layer after the radial pressing.
5. The manufacturing process for producing a bimetal sliding bearing by radial broaching according to any one of claims 1 to 4, wherein: after applying pressure using the radial expansion assembly, the powder or particles are mostly displaced radially.
6. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 5, wherein: the tapered core rod is made of a metal material, has certain hardness after being subjected to heat treatment, and is selected to be HRC 40-75 degrees.
7. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 2, wherein: at least one gap is arranged on the petal type taper sleeve.
8. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 7, wherein: the taper of the inner hole of the petal-type taper sleeve is the same as the taper of the taper surface of the shaft core with the taper, so that the shaft core with the taper forces the excircle of the petal-type taper sleeve to expand due to pressure or pulling force.
9. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 1, wherein: the powder or granular material of the powder layer contains one or more elements having a melting point lower than that of iron.
10. The manufacturing process for producing a bimetal sliding bearing by a radial broaching method according to claim 1, wherein: the method also comprises the step of shaping or heat treatment after high-temperature sintering.
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| CN113956060A (en) * | 2021-12-03 | 2022-01-21 | 福州赛瑞特新材料技术开发有限公司 | Carbon-carbon composite material ring for hot-pressing sintering and preparation method thereof |
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