CN109202044B - Open type centrifugal casting method for large bearing bush babbit alloy - Google Patents
Open type centrifugal casting method for large bearing bush babbit alloy Download PDFInfo
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- CN109202044B CN109202044B CN201811166063.9A CN201811166063A CN109202044B CN 109202044 B CN109202044 B CN 109202044B CN 201811166063 A CN201811166063 A CN 201811166063A CN 109202044 B CN109202044 B CN 109202044B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
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Abstract
The invention discloses a large-scale bearing bush babbitt metal open type centrifugal casting method, which comprises the steps of respectively activating and pre-tinning an upper annular bearing bush and a lower annular bearing bush, respectively arranging a first semi-annular retaining edge and a second semi-annular retaining edge at the positions of inner diameter arcs of two end surfaces of the upper annular bearing bush and the lower annular bearing bush, then assembling the upper bearing bush and the lower bearing bush into the bearing bush, forming an inner hole in the middle of the bearing bush, forming annular retaining edges formed by connecting the first semi-annular retaining edge and the second semi-annular retaining edge at the positions of the inner diameter arcs of the two end surfaces of the bearing bush, then assembling and finally tinning the bearing bush, clamping the bearing bush on a centrifugal casting machine, and roasting the surface of the babbitt metal casting layer by adopting a movable roasting gun in the casting and cooling processes of the bearing bush. And finally stopping the machine for heat preservation and slow cooling when the alloy layer is completely solidified. The scheme solves the problems of unshelling, air holes, loose tissue and the like of the babbitt metal layer caused by extremely fast heat dissipation after the babbitt metal bearing with the inner hole and the larger axial height dimension is poured.
Description
Technical Field
The invention belongs to the technical field of centrifugal casting of bearing bushes, and particularly relates to an open pouring method for babbitt metal of a large bearing bush.
Background
The babbitt metal is a relatively ideal material in bearing alloy bearing medium load, and because the babbitt metal has low strength, the babbitt metal is generally poured on a bearing bush to form a bimetallic bearing bush, and the bearing bush is also called as the babbitt metal bearing bush and is commonly used in various high-speed rotating equipment such as air blowers, steam turbines, water pumps and the like.
The babbitt metal bearing shell is usually prepared by pouring babbitt metal on the inner surface of the bearing shell by a centrifugal casting process to form a babbitt metal layer, so as to prepare the bimetallic bearing shell.
However, the existing babbit metal bearing bush is difficult to meet the requirements of large turbines used in the fields of thermal power, nuclear power and the like, because when the size of a low-pressure supporting bearing bush of the turbine is overlarge, such as the excircle size exceeds phi 1200mm, the inner hole size reaches phi 800mm, the axial height reaches 800mm, and the weight reaches 5.5t, the size and the weight of the supporting bearing product of the turbine exceed those of the existing supporting bearing product of the turbine, and the weight of the existing supporting bearing product of the turbine does not exceed 4 tons, because the babbit metal bearing with the larger inner hole and the axial height has extremely fast heat dissipation after the babbit metal is poured, the babbit metal layer is easy to contact with air to generate defects such as shelling, air holes, loose tissue and the like.
Disclosure of Invention
In order to solve the problems, the invention provides an open type centrifugal casting method for babbitt metal of a large bearing bush, which adopts an open type casting mode, namely two ends of the bearing bush are open, and simultaneously the surface of the cast babbitt metal casting layer of the bearing bush is heated to prevent the alloy on the surface of the babbitt metal layer from being solidified, so that the sequential solidification mode of the alloy from the bush back to an inner hole is realized, and the defects of shelling, air holes, loose structure and the like of the babbitt metal layer caused by the extremely fast heat dissipation after the inner hole and a large babbitt metal bearing with larger axial height dimension are cast are solved.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a large-scale bearing bush babbitt metal open type centrifugal casting method comprises the following steps:
(1) designing a bearing bush: the bearing bush comprises a semi-annular upper bearing bush and a semi-annular lower bearing bush, wherein a first semi-annular flange is arranged at the position of an inner diameter arc line of two end faces of the upper bearing bush, and a second semi-annular flange is arranged at the position of an inner diameter arc line of two end faces of the lower bearing bush;
(2) pretreatment and assembly of the bearing bush: the upper bearing bush and the lower bearing bush are respectively pretreated and pre-tinned and then connected and assembled to form a bearing bush, an inner hole is formed in the middle of the bearing bush, and annular flanges formed by connecting a first semi-annular flange and a second semi-annular flange are formed at the positions of inner diameter circular lines of two end faces of the bearing bush; a high-temperature sealing gasket is clamped on a middle split surface of the upper bearing bush, which is contacted with the lower bearing bush;
(3) clamping: after the assembly is finished, final tinning is carried out, and the bearing bush after the final tinning is quickly clamped on a centrifugal casting machine;
(4) pouring: after clamping is finished, starting a centrifugal casting machine to rotate the bearing bush, starting to cast liquid babbit alloy on the inner surface of the bearing bush, and simultaneously axially moving the surface of the babbit alloy casting layer by using a movable baking gun in the casting process to bake the surface of the babbit alloy casting layer; after the pouring is finished, a cooling system is started to forcibly cool the tile back, and meanwhile, the movable baking gun is kept to axially move on the surface of the Babbitt metal pouring layer, so that the surface of the Babbitt metal pouring layer is continuously baked. And (4) moving a baking gun to bake the surface of the Babbitt metal casting layer for 6-10 min. And stopping the machine for heat preservation and slow cooling when the alloy layer is completely solidified.
The invention prevents babbitt metal liquid from flowing out in the pouring process by forming annular flanges at the positions of inner diameter circular lines of two end surfaces of the bearing bush, replaces the traditional bearing bush that additional sealing clamps are arranged on the two end surfaces to prevent babbitt metal liquid from flowing out from the two ends in the pouring process, the two ends of the bearing bush are open, thereby realizing open pouring, baking the surface of the babbitt metal pouring layer by adopting a movable baking gun during pouring in order to prevent the surface of the babbitt metal from solidifying, and ensuring enough flame baking time in the whole process, aiming at ensuring that the babbitt metal is in a melting state to promote the alloy layer to be compact and flawless, simultaneously, realizing the secondary melting of the babbitt metal which is rapidly solidified by contacting with air due to the heating function realized by the open pouring process along with the flame baking, and avoiding the forming of mushy crystal in the solidifying process, and the purpose of sequential solidification of the tile back to the inner hole is achieved by combining rapid cooling, and the function of full feeding of the alloy at the middle part and the bottom part of the Babbitt alloy layer by the alloy on the inner surface of the Babbitt alloy layer ensures the compactness of the Babbitt alloy layer.
Preferably, the joint of the first semi-annular rib and the second semi-annular rib on the annular ribs on the two end faces of the bearing bush is sealed by welding a thin steel plate.
By adopting the preferable scheme, the Babbitt metal liquid is prevented from flowing out from a gap at the joint of the first semi-annular rib and the second semi-annular rib on the end surface of the bearing bush during centrifugal casting.
Preferably, the outer surfaces of the upper bearing bush and the lower bearing bush are respectively provided with a clamping groove.
Adopt above-mentioned preferred scheme, can be through set up on the casting machine with draw-in groove complex cardboard to prevent axle bush axial displacement, ensure the safety of pouring.
Preferably, the high-temperature sealing gasket is an asbestos pad.
Adopt above-mentioned preferred scheme, the asbestos pad can prevent that the babbitt metal liquid from following the well facet from revealing, can guarantee simultaneously that upper and lower axle bush is quick separately.
Preferably, the step 3 of clamping the bearing bush on the centrifugal casting machine is realized through a clamping jaw fixed on a clamping fixture of the centrifugal casting machine, the clamping jaw comprises a clamping jaw fixing part and a clamping jaw clamping part, a sliding shaft is installed on the clamping jaw clamping part, a disc spring group is connected to the lower portion of the sliding shaft, a locking nut is connected to the upper portion of the sliding shaft, a limiting clamping plate is fixedly installed on the clamping jaw clamping part, and the bottom of the limiting clamping plate is matched with the clamping groove.
Adopt above-mentioned preferred scheme, when the clamping axle bush, can be quick fix a position and the centering to the axle bush, be equipped with dish spring group on the jack catch simultaneously, possess automatic flexible function for the jack catch can promptly the axle bush all the time. Meanwhile, the clamping jaw clamping part is provided with the limiting clamping plate matched with the clamping groove, so that the bearing bush can be prevented from moving axially, and the casting safety is ensured.
Preferably, the flame used by the mobile baking gun is oxyacetylene flame.
Adopt above-mentioned preferred scheme, select for use oxyacetylene flame can guarantee that flame reaches the stoving temperature.
Drawings
FIG. 1 is a schematic view of the bearing shell
FIG. 2 upper bearing shell section view
FIG. 3 schematic view of an assembled bearing shell without casting
FIG. 4 is a schematic view of the bearing shell after casting
FIG. 5 is a cross-sectional view of the upper bushing after casting
FIG. 6 layout of centrifugal casting machine
FIG. 7 clip schematic
FIG. 8 is a schematic view of a clip clamping structure
In the figure, 1-an upper bearing bush, 2-a lower bearing bush, 3-an annular rib, 31-a first semi-annular rib, 32-a second semi-annular rib, 4-a bearing bush, 5-a high-temperature sealing gasket, 6-a babbit cast layer, 7-a thin steel plate, 8-a clamping groove, 9-a clamping jaw, 91-a clamping jaw fixing part, 92-a clamping jaw clamping part, 921-a sliding shaft, 922-a disc spring group, 923-a locking nut, 924-a limiting clamping plate, 10-a smelting furnace, 11-a casting system, 12-a casting channel, 13-a main shaft, 14-a protective cover, 15-a clamping fixture and 16-an inner hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1-6, a large bearing shell babbitt metal open centrifugal casting method comprises the following steps:
(1) designing a bearing bush: as shown in fig. 1, 2 and 3, the bearing bush 4 includes a semi-annular upper bearing bush 1 and a semi-annular lower bearing bush 2, a first semi-annular rib 31 is disposed at an inner diameter arc position of two end surfaces of the upper bearing bush 1, and a second semi-annular rib 32 is disposed at an inner diameter arc position of two end surfaces of the lower bearing bush 2.
(2) Pretreatment and assembly of the bearing bush: the upper bearing shell 1 and the lower bearing shell 2 are respectively activated and pre-tinned, as a person skilled in the art will know, there are many conventional means for activating and pre-tinning the bearing shell 4, and any means for activating and pre-tinning the bearing shell 4 may be adopted, and the details of the means for activating and pre-tinning the bearing shell are not repeated here. After pretreatment, assembling, as shown in fig. 1, 2 and 3, connecting and assembling the upper bearing shell 1 and the lower bearing shell 2 to form a bearing shell 4, forming an inner hole 16 in the middle of the bearing shell 4, and forming an annular rib 3 formed by connecting a first semi-annular rib 31 and a second semi-annular rib 32 at the position of an inner diameter circular line of two end surfaces of the bearing shell 4; a high-temperature sealing gasket 5 is clamped on a middle split surface of the upper bearing bush 1, which is contacted with the lower bearing bush 2; the connection of the upper bearing bush 1 and the lower bearing bush 2 is detachable connection, the connection mode can adopt threaded connection, positioning pins connection and other connection modes, the stability of the bearing bush 4 in the pouring process can be guaranteed, and the rapid detachment and installation of the upper bearing bush 1 and the lower bearing bush 2 can also be guaranteed. The annular flanges 3 formed by connecting the first semi-annular flange 31 and the second semi-annular flange 32 are formed at the positions of inner diameter circular lines of two end faces of the bearing bush 4, the annular flanges 3 can prevent babbit metal liquid from flowing out from two ends of the bearing bush 4 during pouring, and the flanges of the bearing bush 4 replace the traditional bearing bush 4 and are provided with additional sealing clamps on two end faces, so that two ends of the bearing bush 4 are opened in the pouring process, and open pouring is realized. The high-temperature sealing gasket 5 is clamped on the middle parting surface of the upper bearing bush 1, which is contacted with the lower bearing bush 2, in order to prevent the babbitt metal liquid from flowing out from the gap of the middle parting surface, so that the high-temperature sealing gasket 5 can meet the requirement of a gasket made of a material which is high-temperature resistant and can play a sealing role.
(3) Clamping: and rapidly clamping the bearing bush 4 after the final tinning on a centrifugal casting machine. The purpose of this process is mainly to clamp the bearing shell 4 on a centrifugal casting machine. As a person skilled in the art should know that a plurality of conventional clamping technical means are used to clamp the bearing bush 4 on the centrifugal casting machine, and any clamping technical means to clamp the bearing bush 4 on the centrifugal casting machine can be used as a direct replacement of this embodiment, and the details of the clamping means are not repeated here.
(4) Pouring: as shown in fig. 4, 5 and 6, after clamping, starting a centrifugal casting machine to rotate the bearing bush 4, starting to cast liquid babbitt metal on the inner surface of the bearing bush 4, and simultaneously axially moving the surface of the babbitt metal cast layer 6 by using a movable baking gun in the casting process to bake the surface of the babbitt metal cast layer 6; after the pouring is finished, a cooling system is started to forcibly cool the tile back, and meanwhile, the movable baking gun is kept to axially move on the surface of the babbitt metal pouring layer 6, so that the surface of the babbitt metal pouring layer 6 is continuously baked. And (4) baking the surface of the Babbitt metal casting layer 6 for 6-10min by moving a baking gun. Stopping the machine when the alloy layer is completely solidified, preserving heat and slowly cooling.
After clamping is finished, the centrifugal casting machine is started, the main shaft 13 of the centrifugal casting machine rotates to drive the bearing bush 4 to rotate, and when the rotating speed of the centrifugal casting machine meets the process requirement, the babbitt metal liquid in the smelting furnace enters the casting channel 12 arranged in the inner hole 16 of the bearing bush 4 from the casting system 11 to start the babbitt metal casting. In the invention, the required rotating speed ranges are different for the bearing bushes 4 with different diameters of the inner hole 16, for example, the diameter of the inner hole 16 is 800mm, and the rotating speed range is 150-. When the babbitt metal is poured, a movable baking gun is used for baking the babbitt metal pouring layer 6 on the surface, the movable baking gun needs to continuously move in the axial direction of the bearing bush 4, the moving speed is slowly controlled, and the uniform heating of all the alloy surfaces is ensured. The heating function is realized along with the baking by using a movable baking gun in the pouring process, so that the secondary melting of the surface alloy of the babbitt metal which is in contact with air and is rapidly solidified is realized, the pasty crystallization formed in the babbitt metal solidification process is avoided, the sequential solidification of the tile back to the inner hole 16 is realized by combining with rapid cooling, the function of fully feeding the alloy at the middle part and the bottom part of the babbitt metal pouring layer 6 by the surface alloy of the babbitt metal layer pouring layer 6 is realized, and the compactness of the babbitt metal pouring layer 6 is ensured. And after the pouring is finished, starting a cooling system to forcibly cool the tile back, simultaneously keeping the movable baking gun to axially move on the surface of the babbitt metal pouring layer 6, and continuously baking the surface of the babbitt metal pouring layer 6 for a period of time so as to ensure enough flame baking time and ensure that the babbitt metal is in a molten state. The movable baking gun is used for baking the surface of the babbitt metal pouring layer 6 for 6-10min, so that enough flame baking time can be ensured, and the babbitt metal is ensured to be in a molten state. And stopping the machine for heat preservation and slow cooling until the babbitt metal is completely solidified, and finishing the pouring process of the bearing bush 4.
In the embodiment, the heating function is arranged on the surface of the babbitt metal pouring layer 6, so that the surface of the babbitt metal pouring layer 6 is ensured to be fed to the bottom layer of the babbitt metal pouring layer, and the compactness of the alloy is ensured, thereby ensuring that the compactness of the alloy can be ensured even if the babbitt metal bearing with larger inner hole and axial height dimension is poured, and the defects of decladding, air holes, loose structure and the like of the babbitt metal layer are not easily caused. Therefore, the bearing bush can be suitable for large-scale turbine supporting bearing bushes with the outer circle size larger than phi 1200mm and the weight of more than 4 t.
Example 2
As shown in fig. 1, 2 and 3, in addition to the embodiment 1, the joint between the first semi-annular rib 31 and the second semi-annular rib 32 on the annular ribs 3 on the two end surfaces of the bearing bush 4 is welded and blocked by the thin steel plate 7. The thin steel plate 7 is welded at the joint of the first semi-annular rib 31 and the second semi-annular rib 32, so that the babbitt metal liquid can be prevented from flowing out from a gap at the joint of the first semi-annular rib 31 and the second semi-annular rib 32 on the annular rib 3 on the end surface of the bearing bush 4 during centrifugal casting. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 3
As shown in fig. 2, on the basis of embodiment 1, the outer surfaces of the upper bearing shell 1 and the lower bearing shell 2 are both provided with a clamping groove 8. Through set up on centrifugal casting machine with draw-in groove 8 complex cardboard, connect into axle bush 4 clamping when last axle bush 1 and lower axle bush 2 on centrifugal casting machine, through the cooperation of draw-in groove 8 and cardboard, can prevent 4 axial displacement of axle bush, ensure the safety of pouring. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 4
As shown in fig. 3, in example 1, the high-temperature sealing gasket 5 is an asbestos pad. The asbestos pad is high temperature resistant, can prevent simultaneously that the babbit alloy liquid from separating the face and revealing, plays sealed effect, and in addition, the asbestos pad can also guarantee that upper bearing shell 1 and lower bearing shell 2 are quick separately. In this embodiment, other undescribed contents are the same as those in the above embodiment, and are not described again here.
Example 5
As shown in fig. 7 and 8, on the basis of embodiment 3, in step 3, the bearing bush 4 is clamped on the centrifugal casting machine by the jaw 9 fixed on the clamping fixture 15, the jaw 9 includes a jaw fixing portion 91 and a jaw clamping portion 92, the jaw clamping portion 92 is provided with a sliding shaft 921, the lower portion of the sliding shaft 921 is connected with a disc spring set 922, the upper portion of the sliding shaft 921 is connected with a locking nut 923, the jaw clamping portion 92 is fixedly provided with a limiting clamping plate 924, and the bottom of the limiting clamping plate 924 is matched with the clamping groove 8.
In this embodiment, there are 4 claws 9, two claws are arranged above and below, before clamping, the positions of the 4 claws 9 are adjusted in advance to form 45 degrees with the vertical direction, the two claws 9 at the lower part are adjusted by taking the size of the outer circle of the bearing bush 4 as a datum line, and the two claws 9 at the upper part are adjusted to be about outside the outer circle. After the bearing bush 4 is supported on the two clamping jaws 9 at the lower part by gravity, the two clamping jaws 9 at the upper part are quickly pre-tightened by adopting a hydraulic wrench, so that the effect of quick clamping is achieved. The concentricity of the bearing bush 4 and the clamping fixture 15 can be effectively controlled by adjusting the method. Because the jack catch 9 divide into jack catch fixed part 91 and jack catch clamping part 92 and is used for fixing axle bush 4, sets up the slide axis 921 on jack catch clamping part 92 simultaneously, and slide axis 921 sub-unit connection has dish spring group 922, slide axis 921 upper portion is connected with lock nut 923, when the cooling shrinkage process appears in the pouring process of axle bush 4, under the effect of dish spring group 922, promotes the slide axis 921 and presss from both sides tight axle bush 4 all the time, realizes the online clamping function. In addition, the spacing cardboard 924 of fixed mounting on the jack catch clamping part 92 cooperates with the draw-in groove 8 on the axle bush 4, prevents axle bush 4 endwise slip, plays the safety protection effect.
Example 6
On the basis of example 1, the flame used by the mobile baking gun is an oxyacetylene flame. In order to ensure that the flame of the movable baking gun reaches the baking temperature, the oxyacetylene flame selected by the implementation can ensure that the flame reaches the baking temperature.
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 invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A large-scale bearing bush babbitt metal open type centrifugal casting method is characterized by comprising the following steps:
(1) designing a bearing bush: the bearing bush comprises a semi-annular upper bearing bush and a semi-annular lower bearing bush, wherein a first semi-annular flange is arranged at the position of an inner diameter arc line of two end faces of the upper bearing bush, and a second semi-annular flange is arranged at the position of an inner diameter arc line of two end faces of the lower bearing bush;
(2) pretreatment and assembly of the bearing bush: the upper bearing bush and the lower bearing bush are respectively subjected to activation and pre-tinning treatment and then are connected and assembled to form a bearing bush, an inner hole is formed in the middle of the bearing bush, and annular flanges formed by connecting a first semi-annular flange and a second semi-annular flange are formed at the positions of inner diameter circular lines of two end faces of the bearing bush; a high-temperature sealing gasket is clamped on a middle split surface of the upper bearing bush, which is contacted with the lower bearing bush;
(3) clamping: after the assembling is finished, final tinning is carried out, the bearing bush after the final tinning is quickly clamped on four clamping jaws of a centrifugal casting machine, before the clamping, the positions of 4 clamping jaws are adjusted to be 45 degrees with the vertical direction in advance, the two clamping jaws on the lower part are adjusted by taking the size of the excircle of the bearing bush as a datum line, the two clamping jaws on the upper part are adjusted to be out of the excircle, and after the bearing bush is supported on the two clamping jaws on the lower part by gravity, a hydraulic wrench is quickly adopted to pre-tighten the two clamping jaws on the upper part;
(4) pouring: after clamping is finished, a centrifugal casting machine is started to rotate the bearing bush, liquid babbit alloy is cast on the inner surface of the bearing bush, a movable baking gun is used to axially move on the surface of the babbit alloy casting layer in the casting process, the babbit alloy casting layer is baked, secondary melting of the babbit alloy which is rapidly solidified by contacting with air is realized, and the purpose of sequential solidification of the bearing bush back to an inner hole is achieved by combining rapid cooling; after pouring, starting a cooling system to forcibly cool the tile back, keeping the movable baking gun moving axially on the surface of the babbit metal pouring layer, and continuously baking the surface of the babbit metal pouring layer; the surface of the Babbitt metal casting layer is baked for 6-10min by a movable baking gun; stopping the machine to preserve heat and slowly cool when the alloy layer is completely solidified;
the flame for the movable baking gun is oxyacetylene flame;
the outer surfaces of the upper bearing bush and the lower bearing bush are respectively provided with a clamping groove.
2. The open centrifugal casting method for babbitt metal of large bearing shell according to claim 1, wherein the joint of the first semi-annular rib and the second semi-annular rib on the annular ribs on the two end faces of the bearing shell is sealed by welding with a thin steel plate.
3. The open centrifugal casting method for babbitt metal of large bearing shell according to claim 1, wherein the high-temperature sealing gasket is an asbestos gasket.
4. The open centrifugal casting method for babbitt metal on a large bearing bush according to claim 3, wherein the step 3 of clamping the bearing bush on the centrifugal casting machine is realized by a jaw fixed on a clamping fixture on the centrifugal casting machine, the jaw comprises a jaw fixing part and a jaw clamping part, the jaw clamping part is provided with a sliding shaft, the lower part of the sliding shaft is connected with a disc spring set, the upper part of the sliding shaft is connected with a locking nut, the jaw clamping part is fixedly provided with a limiting clamping plate, and the bottom of the limiting clamping plate is matched with the clamping groove.
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| CN201811166063.9A CN109202044B (en) | 2018-09-30 | 2018-09-30 | Open type centrifugal casting method for large bearing bush babbit alloy |
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| CN201811166063.9A CN109202044B (en) | 2018-09-30 | 2018-09-30 | Open type centrifugal casting method for large bearing bush babbit alloy |
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| CN111001924B (en) * | 2019-12-24 | 2022-02-01 | 郑州机械研究所有限公司 | Method and equipment for manufacturing babbitt metal bearing bush |
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