CN112157405A - Processing method of low-speed diesel engine bimetallic bearing bush - Google Patents
Processing method of low-speed diesel engine bimetallic bearing bush Download PDFInfo
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- CN112157405A CN112157405A CN202011057370.0A CN202011057370A CN112157405A CN 112157405 A CN112157405 A CN 112157405A CN 202011057370 A CN202011057370 A CN 202011057370A CN 112157405 A CN112157405 A CN 112157405A
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a processing method of a bimetallic bearing bush of a low-speed diesel engine, which comprises the following steps: s1, folding and welding the two bearing bushes to be processed into a cylinder; s2, after the alloy is melted, the alloy is attached to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, and the thickness of the alloy layer on the surface of the inner hole of the cylinder is controlled to be 7-10 mm; s3, stress relief annealing, and adjusting annealing temperature and heat preservation time according to alloy materials; and S4, grinding the outer circle of the cylinder and reserving machining allowance, wherein the machining allowance is equal to the lower limit value of the free elastic expansion plus 0.5-1.5S 5, splitting the cylinder and performing finish machining to obtain a finished product of the bimetal bearing bush. The method can avoid the overrun of the free elasticity, and improve the one-time natural forming rate and the processing qualification rate of the bimetallic bearing bush.
Description
Technical Field
The invention relates to the forming processing of a bearing bush, in particular to a processing method of a bimetallic bearing bush of a low-speed diesel engine.
Background
The low-speed diesel engine bearing bush has the characteristics of large diameter and thin wall, the diameter is generally more than 500mm, the wall thickness is 10-20 mm, the casting alloy stress is large, the tolerance of the free elasticity is generally +2 mm-5 mm, and the critical dimension influencing the performance of the bearing bush is provided.
The free-spring quantity of the rolled bimetallic bearing bush is extremely difficult to control, the free-spring quantity after the rolling bimetallic bearing bush is cut into two semi-circles from a whole circle is often not large or small, the tolerance is extremely easy to exceed, and partial unqualified products can be saved through shaping, but other sizes of the bearing bush can be damaged, so that the quality of the repaired products is greatly different from that of the naturally formed bearing bush.
Disclosure of Invention
The invention aims to provide a processing method of a bimetallic bearing bush of a low-speed diesel engine, which can avoid the overrun of the free elasticity, and improve the one-time natural forming rate and the processing qualification rate of the bimetallic bearing bush.
The invention relates to a processing method of a bimetallic bearing bush of a low-speed diesel engine, which comprises the following steps:
s1, folding and welding the two bearing bushes to be processed into a cylinder;
s2, after the alloy is melted, the alloy is attached to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, and the thickness of the alloy layer on the surface of the inner hole of the cylinder is controlled to be 7-10 mm;
s3, stress relief annealing, and adjusting annealing temperature and heat preservation time according to alloy materials;
s4, grinding the outer circle of the cylinder and reserving machining allowance, wherein the machining allowance is equal to the lower limit value of the free elastic expansion plus 0.5-1.5
And S5, cutting the cylinder open and performing finish machining to obtain the finished product of the bimetallic bearing bush.
Furthermore, the diameter X of the outer circle of the finished bimetallic bearing bush is more than or equal to 450mm, and the ratio of the diameter X of the outer circle to the wall thickness t is 30-50.
Further, the bearing bush to be machined in the step S1 is made of low-carbon steel, and the casting alloy in the step S2 is Babbitt metal.
Further, the temperature of the stress relief annealing in the S3 is 150-170 ℃, and the heat preservation time is 3-4 h.
The invention comprehensively limits the alloy casting thickness, the heat treatment process parameters and the machining allowance of the grinding excircle, effectively avoids the excess difference of the free elastic tension of the bimetallic bearing bush, enables the bimetallic bearing bush to be naturally formed at one time, does not need to be repaired and shaped, and improves the machining qualification rate of products.
The invention limits the casting thickness of the alloy to be 7-10 mm, on one hand, the residual internal stress of the cooled material can be eliminated through subsequent stress relief annealing, and on the other hand, the alloy forming quality is ensured. If the casting thickness of the alloy is too small, pores or shrinkage porosity defects are easily generated on the surface of the alloy layer, and the quality of the alloy layer is influenced; if the casting thickness of the alloy is too large, the difference of the cooling rates of the two sides of the alloy layer is large, so that the residual stress is too large to be completely removed, the cost is high, and the large-scale industrial production is not facilitated.
According to the invention, the annealing temperature and the heat preservation time of the stress relief annealing treatment are adjusted according to the alloy material, so that the residual internal stress of the cylinder is fully eliminated, and the phenomenon that the free elastic tension of the split bimetallic bearing bush exceeds the limit due to overlarge internal stress is avoided. And when the material of the bearing bush to be processed is low-carbon steel, the casting alloy is babbitt metal, the temperature of stress relief annealing is limited to 150-170 ℃, the heat preservation time is 3-4 hours, if the temperature is too high and the heat preservation time is too long, the babbitt metal has melting risk, the combination quality of the alloy and the cylinder is further influenced, if the temperature is too low and the heat preservation time is too short, residual internal stress in the material cannot be completely removed, and residual internal stress which is not removed easily causes the free elastic tension to be over-limited, so that the product processing qualification rate is reduced.
According to the invention, according to the flick rule after splitting two semicircles from a whole circle, the machining allowance = the lower limit value of the free flick tension + 0.5-1.5 of the grinding excircle is limited, the overrun of the free flick tension of the split semicircle is effectively avoided, and the finish machining requirement of the split semicircle is met.
Drawings
FIG. 1 is a schematic thickness diagram of a centrifugally cast alloy of the present invention;
fig. 2 is a schematic structural diagram of a bimetallic bearing bush finished product of the invention.
1-substrate, 2-alloy layer.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
In the first embodiment, referring to fig. 2, a substrate 1 of a bimetallic bearing bush for a low-speed diesel engine to be manufactured is low-carbon steel, babbitt metal is bonded to the inner surface of the substrate 1, the outer circle diameter X =600mm, the wall thickness t =20mm, and the tolerance of the free elasticity is +2mm to +5mm, and the specific processing method includes the following steps:
and S1, folding and welding the two bearing bushes to be processed into a cylinder, wherein the bending and rough processing of each surface of the plate before folding are conventional technologies, and the invention is not described any more.
S2, melting the babbit metal, attaching the babbit metal to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, referring to fig. 1, controlling the thickness d of the alloy layer 2 on the surface of the inner hole of the cylinder to be 7mm, wherein the diameter phi of the outer circle of the cylinder is larger than the diameter X of the outer circle of the finished bimetallic bearing bush, and the wall thickness t1 of the cylinder is larger than the wall thickness t of the finished bimetallic.
S3, stress relief annealing, and keeping the cylinder with the alloy layer 2 at 150 ℃ for 3.5 h.
And S4, grinding the outer circle of the cylinder and leaving a machining allowance, wherein the machining allowance = the lower limit value of the free elastic tension +0.5mm, namely the machining allowance is 2.5 mm.
And S5, splitting the cylinder and performing finish machining to obtain a finished product of the bimetallic bearing bush, wherein the free elasticity of the finished product of the bimetallic bearing bush is measured to be 2.3mm, so that the requirement is met.
The second embodiment provides a processing method of a bimetallic bearing bush of a low-speed diesel engine, wherein a substrate of the bimetallic bearing bush is low-carbon steel, babbitt metal is combined on the inner surface of the substrate, the diameter X =600mm of an outer circle, the wall thickness t =20mm, and the tolerance of the free elasticity is +2mm to +5mm, and the specific processing method comprises the following steps:
and S1, folding and welding the two bearing bushes to be processed into a cylinder.
And S2, after the babbitt metal is melted, the babbitt metal is attached to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, and the thickness of the alloy layer on the surface of the inner hole of the cylinder is controlled to be 8 mm.
S3, stress relief annealing, and keeping the cylinder with the alloy layer at 170 ℃ for 4 h.
And S4, grinding the outer circle of the cylinder and leaving a machining allowance, wherein the machining allowance = the lower limit value of the free elastic tension +1.5mm, namely the machining allowance is 3.5 mm.
And S5, splitting the cylinder and performing finish machining to obtain a finished product of the bimetallic bearing bush, wherein the free elasticity of the finished product of the bimetallic bearing bush is measured to be 3.6mm, so that the requirement is met.
In a third embodiment, a processing method of a bimetallic bearing bush of a low-speed diesel engine is provided, wherein a substrate of the bimetallic bearing bush is low-carbon steel, babbitt metal is bonded on an inner surface of the substrate, the outer circle diameter X =800mm, the wall thickness t =20mm, and the tolerance of the free elasticity is +2mm to +5mm, and the processing method specifically includes the following steps:
and S1, folding and welding the two bearing bushes to be processed into a cylinder.
And S2, after the babbitt metal is melted, the babbitt metal is attached to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, and the thickness of the alloy layer on the surface of the inner hole of the cylinder is controlled to be 7 mm.
S3, stress relief annealing, and keeping the cylinder with the alloy layer at 165 ℃ for 3 h.
And S4, grinding the outer circle of the cylinder and leaving a machining allowance, wherein the machining allowance = the lower limit value of the free elastic tension +1mm, namely the machining allowance is 3 mm.
And S5, splitting the cylinder and performing finish machining to obtain a finished product of the bimetallic bearing bush, wherein the free elasticity of the finished product of the bimetallic bearing bush is measured to be 2.9mm, so that the requirement is met.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. A processing method of a bimetallic bearing bush of a low-speed diesel engine is characterized by comprising the following steps:
s1, folding and welding the two bearing bushes to be processed into a cylinder;
s2, after the alloy is melted, the alloy is attached to the surface of the inner hole of the cylinder by adopting a centrifugal casting process, and the thickness of the alloy layer on the surface of the inner hole of the cylinder is controlled to be 7-10 mm;
s3, stress relief annealing, and adjusting annealing temperature and heat preservation time according to alloy materials;
s4, grinding the outer circle of the cylinder and reserving machining allowance, wherein the machining allowance is equal to the lower limit value of the free elastic expansion plus 0.5-1.5
And S5, cutting the cylinder open and performing finish machining to obtain the finished product of the bimetallic bearing bush.
2. The processing method of the low-speed diesel engine bimetallic bearing shell according to claim 1, characterized in that: the diameter X of the outer circle of the finished bimetallic bearing is more than or equal to 450mm, and the ratio of the diameter X of the outer circle to the wall thickness t is 30-50.
3. The processing method of the low-speed diesel engine bimetallic bearing bush according to claim 1 or 2, characterized in that: the bearing bush to be machined in the step S1 is made of low-carbon steel, and the casting alloy in the step S2 is Babbitt metal.
4. The processing method of the low-speed diesel engine bimetallic bearing bush according to claim 3, characterized in that: the temperature of the stress relief annealing in the S3 is 150-170 ℃, and the heat preservation time is 3-4 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011057370.0A CN112157405A (en) | 2020-09-30 | 2020-09-30 | Processing method of low-speed diesel engine bimetallic bearing bush |
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| CN202011057370.0A CN112157405A (en) | 2020-09-30 | 2020-09-30 | Processing method of low-speed diesel engine bimetallic bearing bush |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113441904A (en) * | 2021-07-30 | 2021-09-28 | 南京荣鑫机械制造有限公司 | Repairing method of bearing bush |
| CN113909812A (en) * | 2021-10-09 | 2022-01-11 | 重庆红江机械有限责任公司 | Machining method of slideway counter bore |
| CN113909811A (en) * | 2021-10-09 | 2022-01-11 | 重庆跃进机械厂有限公司 | Processing method of two half type bearing bushes |
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| CN109202044A (en) * | 2018-09-30 | 2019-01-15 | 东方电气集团东方汽轮机有限公司 | A kind of open casting method for centrifugal of large axle bush babbit |
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2020
- 2020-09-30 CN CN202011057370.0A patent/CN112157405A/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113441904A (en) * | 2021-07-30 | 2021-09-28 | 南京荣鑫机械制造有限公司 | Repairing method of bearing bush |
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| CN113909812A (en) * | 2021-10-09 | 2022-01-11 | 重庆红江机械有限责任公司 | Machining method of slideway counter bore |
| CN113909811A (en) * | 2021-10-09 | 2022-01-11 | 重庆跃进机械厂有限公司 | Processing method of two half type bearing bushes |
| CN113909811B (en) * | 2021-10-09 | 2024-03-22 | 重庆跃进机械厂有限公司 | Processing method of two-half bearing bush |
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