CN112943800B - Manufacturing method of sliding oil film bearing bush - Google Patents
Manufacturing method of sliding oil film bearing bush Download PDFInfo
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- CN112943800B CN112943800B CN202110415000.8A CN202110415000A CN112943800B CN 112943800 B CN112943800 B CN 112943800B CN 202110415000 A CN202110415000 A CN 202110415000A CN 112943800 B CN112943800 B CN 112943800B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
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Abstract
The invention relates to a manufacturing method of a sliding oil film bearing bush, which uses a zinc-aluminum alloy wire, carries out surfacing and cladding on a steel back of the bearing bush by a gas shielded welding method, adjusts the tissue structure of a surfacing bearing lining layer by a heat treatment process, eliminates welding stress, simultaneously realizes stabilization treatment and finally processes the bearing bush into a required size. Compared with the babbitt metal bearing bush manufactured by the traditional centrifugal casting process, the manufacturing method of the sliding oil film bearing bush provided by the invention is additive manufacturing, and has the advantages of simple process, no segregation, no bottom shrinkage, high binding force, good reliability, long service life, low cost and the like.
Description
Technical Field
The invention relates to a method for manufacturing a bearing bush of a sliding oil film bearing.
Background
Plain bearings are important support members in mechanical transmissions. Babbit metal is the most widely known bearing lining material of the sliding oil film bearing, and is combined with a backing material to form a bearing bush which has antifriction property and is widely used for the sliding oil film bearing of large marine diesel engines, turbines, alternators, other mining machinery, steel rolling machinery and the like.
The babbitt metal contains more tin-copper and tin-antimony hard phases, a matrix is a tin-based solid solution soft phase, the hard phase is slightly convex on the surface after the bearing operates to play a supporting role, and the tin-based soft phase is concave downwards and can store lubricating oil.
The traditional bearing bush preparation method is a centrifugal casting process, babbitt alloy is melted and poured into a bearing bush steel back, the bearing bush steel back is rotated and cooled and solidified, and then a final bearing bush product is obtained through turning. With the technical progress, the pressure of environmental protection, operation environment and cost, and the requirements of low-speed heavy-load fields such as rolling mills, ships, wind driven generators and the like on sliding bearings are higher and higher. On the other hand, since the resources of high-quality tin are becoming smaller and the price of tin is becoming higher, there is an urgent need to find alternative materials for reducing the manufacturing cost.
Therefore, a method for preparing a bearing bush, which is low in cost, high in quality, long in service life, and simple and easy to implement, is needed. The zinc-aluminum-based alloy is used for manufacturing a bearing lining material of a bearing bush at one time, the cost is low, but during the manufacturing of the traditional casting process, a low-density aluminum-rich phase floats upwards and solidifies, so that the bottom cannot be supplied with liquid materials, and the defect of bottom shrinkage is easily caused, therefore, the zinc-aluminum-based alloy cannot be popularized and used on the bearing bush (particularly on a bearing bush with a larger size).
Disclosure of Invention
The invention aims to provide a preparation method of a sliding oil film bearing bush, which aims to solve the problems of poor high-temperature creep resistance, low binding force between a bearing bush and a steel backing, serious component segregation, short long-term service life, high cost and the like of the existing centrifugally cast babbit alloy bearing bush.
The technical scheme of the invention is as follows:
1. zinc-aluminum based alloy is used to replace babbitt metal.
The melting onset temperature (solidus) of the zinc aluminium base alloy is 382 ℃ and the solidus of the babbitt alloy is typically around 220 ℃. The closer the service temperature is to the solidus, the more easily the material is softened, which causes the bearing bush to be seriously deformed after being used for a long time, namely creep deformation, and finally to be failed, and the failure mode is one of the main failure modes of the existing babbit alloy bearing bush. Compared with babbitt metal, the zinc-aluminum-based material has a relatively high solidus, and the creep resistance of the bearing bush can be improved under the same operating oil temperature of the bearing bush.
In addition, the zinc-aluminum alloy has very low price which is only one tenth of that of the babbitt metal, and the manufacturing cost of the bearing bush can be greatly reduced.
2. The traditional centrifugal casting process is replaced by the additive manufacturing process of gas shielded surfacing.
In the process of centrifugal casting, solid-phase particles in a metal melt float or sink under the action of centrifugal force due to the fact that specific gravity is different from that of a liquid phase, so that alloy components are segregated, and service performance of a bearing liner material on a bearing bush is affected. For example, tin-antimony phase particles float upward and tin-copper phase particles sink during the solidification of babbitt metal, resulting in segregation. The aluminum-rich primary phase in the solidification process of the zinc-aluminum alloy can float upwards due to low density, so that the surface is firstly solidified, and the place where the bottom is solidified later can not obtain liquid feeding, so that the segregation and bottom shrinkage of a bearing bush layer are caused, the performance and the yield of the bearing bush are seriously influenced, and the key factor for restricting the application of the zinc-aluminum alloy to the manufacture of the bearing bush is also realized.
The surfacing welding belongs to one additive manufacturing process, adopts an electric arc melting means to realize the rapid melting of welding wires and the rapid solidification on a bearing steel backing, inhibits the segregation and bottom shrinkage defects and solves the defects of the traditional centrifugal casting process. In addition, due to the activation of the electric arc on the steel backing base body, the bonding strength between the bearing lining overlaying layer and the steel backing is increased, and the bearing bush is prevented from falling off, so that the service reliability of the bearing bush is improved.
In addition, because the surfacing layer is rapidly solidified, casting defects can be almost avoided, so that the surfacing layer can be very thin and is controlled within a range of 4-5 mm, a conventional centrifugal casting layer needs to reach 12-16 mm, and the thickness of the final machined surfacing layer is about-3 mm. Therefore, compared with a centrifugal casting process, the surfacing process greatly reduces the machining amount, saves the material consumption and further reduces the manufacturing cost.
3. And preparing a special flux for surfacing.
In order to ensure that the zinc-aluminum-based alloy can be successfully overlaid on the back surface of the steel, the flux consisting of zinc chloride and potassium fluoroaluminate is configured, so that rust on the surface of the steel back can be cleared, an oxide film on the surface of the zinc-aluminum alloy melt can be damaged, the overlaying layer and the steel back surface are metallurgically bonded, the bonding strength of the overlaying layer is improved, and the service reliability of the bearing bush is improved.
4. The structure and the performance of the zinc-aluminum-based alloy bearing lining layer are adjusted by a heat treatment method.
Heat treatment is an effective means of adjusting the texture and properties of metal alloy materials. The rapidly solidified zinc-aluminum and alloy layer has a fine structure and low strength, and the strength of the zinc-aluminum base alloy can be improved through a certain heat treatment process, so that the service life of the bearing bush is prolonged.
5. Silicon element is used for replacing copper element in the traditional zinc-aluminum base alloy. The application of the surface overlaying technology firstly needs to obtain wire materials, after copper is added into the zinc-aluminum alloy, the copper can be dissolved in a zinc-rich phase and an aluminum-rich phase at the same time, so that the copper can be easily separated out on an interface of the two phases, the interface is difficult to slide, the alloy strength is greatly improved, and the wire materials are difficult to bend, roll and extrude and draw. Therefore, silicon is used for replacing copper, because the silicon is not dissolved in a zinc-rich phase and only dissolved in an aluminum-rich phase, the strong pinning effect on a two-phase interface is avoided, the strength of the wire cannot be greatly increased, and tests prove that the silicon cannot cause the processing and the service performance of the wire to be remarkably reduced.
The specific technical scheme is as follows:
a manufacturing method of a sliding oil film bearing bush is characterized by comprising the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with a certain diameter by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 22-30% of aluminum (Al), 2.5-3.5% of silicon (Si) and 0.002-0.008% of magnesium (Mg);
(2) after the bearing bush steel back is degreased and derusted, coating a flux on the surface to be welded; the flux is prepared by adding 200-500 g of zinc chloride and 100-300 g of potassium fluoroaluminate into 1 kg of deionized water and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using a gas shielded welding method; the gas shielded welding comprises gas metal arc welding (MIG welding) and non-gas metal arc welding (TIG); the thickness of the overlaying layer is 4-6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 280-320 ℃ for 1.5-2.5 hours, then cooling to room temperature along with a furnace, then heating to 100 ℃, keeping the temperature for 2 hours, and then air cooling to room temperature;
(5) the bearing shells are machined to the required dimensions.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 22% of aluminum (Al), 2.5% of silicon (Si) and 0.002% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 2:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 1.6mm by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 22% of aluminum (Al), 2.5% of silicon (Si) and 0.004% of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 3:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 3.5mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 22% of aluminum (Al), 3% of silicon (Si) and 0.005% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and surfacing a zinc-aluminum-based alloy wire on the back surface of the steel by using a TIG welding method, wherein the thickness of the surfacing is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 4:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 3.5mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 22% of aluminum (Al), 3.5% of silicon (Si) and 0.006% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and surfacing a zinc-aluminum-based alloy wire on the back surface of the steel by using a TIG welding method, wherein the thickness of the surfacing is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 5:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 22% of aluminum (Al), 3.5% of silicon (Si) and 0.008% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 6:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 26% of aluminum (Al), 2.5% of silicon (Si) and 0.002% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 7:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 3.5mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 26% of aluminum (Al), 3% of silicon (Si) and 0.004% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by utilizing a TIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 8:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 3.5mm by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 26 percent of aluminum (Al), 3.5 percent of silicon (Si) and 0.006 percent of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by utilizing a TIG welding method, wherein the overlaying thickness is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 9:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 26% of aluminum (Al), 3.5% of silicon (Si) and 0.008% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 10:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 30 weight percent of aluminum (Al), 2.5 weight percent of silicon (Si) and 0.002 weight percent of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 11:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 3.5mm by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 30% of aluminum (Al), 2.5% of silicon (Si) and 0.004% of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by utilizing a TIG welding method, wherein the overlaying thickness is 4 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 280 ℃ for 1.5 hours, cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature by air;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 12:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 3.5mm by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 30% of aluminum (Al), 3% of silicon (Si) and 0.005% of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and surfacing a zinc-aluminum-based alloy wire on the back surface of the steel by using a TIG welding method, wherein the thickness of the surfacing is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature of 320 ℃ for 2.5 hours, then cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature in an air cooling mode;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 13:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire material with the diameter of 1.6mm by an extrusion and drawing process, wherein the weight ratio of the zinc-aluminum-based alloy is 30% of aluminum (Al), 3.5% of silicon (Si) and 0.006% of magnesium (Mg);
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 320 ℃ for 2.5 hours, cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature by air;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Example 14:
a manufacturing method of a sliding oil film bearing bush comprises the following steps:
(1) firstly, casting a zinc-aluminum-based alloy into a round ingot, and preparing a wire with the diameter of 1.6mm by an extrusion and drawing process, wherein the zinc-aluminum-based alloy comprises 30% of aluminum (Al), 3.5% of silicon (Si) and 0.008% of magnesium (Mg) by weight;
(2) after oil and rust removal is carried out on the bearing bush steel back with the specification of phi 800mm, a flux is coated on the surface to be welded; the flux is prepared by adding 300 g of zinc chloride and 200 g of potassium fluoroaluminate into 1 kg of deionized water, and uniformly stirring;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the steel by using an MIG welding method, wherein the overlaying thickness is 6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing; the heat treatment process comprises the steps of keeping the temperature at 320 ℃ for 2.5 hours, cooling the mixture to room temperature along with a furnace, then heating the mixture to 100 ℃, keeping the temperature for 2 hours, and then cooling the mixture to room temperature by air;
(5) and processing the overlaying welding piece into a bearing bush finished product with the specification of phi 800 mm.
Comparative example 1: to compare the benefits of the above examples, a conventional centrifugally cast 8-4 babbitt was chosen for bearing shell bearing liner alloy compositions of 8wt% antimony, 4 wt% copper and the balance tin.
The performance criteria of the 14 examples and comparative examples above, and the results of their tests on the first bearing of a rolling mill of a certain type, are summarized in the following table:
note: 1. the cost index is obtained by comparing the traditional centrifugal casting babbitt metal bearing bush with the traditional centrifugal casting babbitt metal bearing bush which is 1 in other schemes;
2. creep index: keeping the indentation depth of the surface of the pad surfacing layer for 24 hours at 100 ℃ by using a pressure head with the diameter of phi 0.7mm and the pressure of 4.5 kg;
3. the service life of the bearing bush is as follows: the bearing bush with the diameter of 800mm is manufactured and used for a bearing of a first rolling mill of a rolling mill, and the service life of the bearing bush is inspected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, so that the equivalent changes or modifications of the structure, features and principles of the present invention by those skilled in the art should fall within the protection scope of the present invention.
Claims (2)
1. A manufacturing method of a sliding oil film bearing bush is characterized by comprising the following steps:
(1) firstly, casting a zinc-aluminum base alloy into a round ingot, and preparing a wire with a certain diameter by an extrusion and drawing process;
(2) after the bearing bush steel back is degreased and derusted, coating a flux on the surface to be welded;
(3) cladding and overlaying a zinc-aluminum-based alloy wire on the back surface of the bearing steel by using a gas shielded welding method, wherein the thickness of the overlaying layer is 4-6 mm;
(4) carrying out heat treatment on the bearing bush subjected to surfacing;
(5) machining the bearing bush into a required size;
the weight ratio of the zinc-aluminum-based alloy is 22-30% of aluminum (Al), 2.5-3.5% of silicon (Si) and 0.002-0.008% of magnesium (Mg);
the flux is prepared by adding 200-500 g of zinc chloride and 100-300 g of potassium fluoroaluminate into 1 kg of deionized water and uniformly stirring;
the gas shielded welding includes metal-arc gas welding (MIG) and non-metal-arc gas welding (TIG).
2. The method for manufacturing a bearing shell of a sliding oil film bearing according to claim 1, wherein the heat treatment process comprises the steps of preserving heat at 280-320 ℃ for 1.5-2.5 hours, then cooling to room temperature, then heating to 100 ℃, preserving heat for 2 hours, and then cooling to room temperature.
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| CN202110415000.8A CN112943800B (en) | 2021-04-17 | 2021-04-17 | Manufacturing method of sliding oil film bearing bush |
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| CN202110415000.8A CN112943800B (en) | 2021-04-17 | 2021-04-17 | Manufacturing method of sliding oil film bearing bush |
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