CN111015117A - Machining method for bearing bush groove of marine engine - Google Patents
Machining method for bearing bush groove of marine engine Download PDFInfo
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- CN111015117A CN111015117A CN201911357032.6A CN201911357032A CN111015117A CN 111015117 A CN111015117 A CN 111015117A CN 201911357032 A CN201911357032 A CN 201911357032A CN 111015117 A CN111015117 A CN 111015117A
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- marine engine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- 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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- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a method for processing a groove of a bearing bush of a marine engine, which comprises the following steps: firstly, clamping and fixing a bearing bush on a positioning mechanism of a boring machine; step two, finely boring the inner peripheral surface of the bearing bush; boring the inner peripheral surface of the bearing bush to form a spiral groove by using a groove boring cutter, wherein the groove boring cutter comprises a cutter handle and a cutting edge connected to the cutter handle, the cutting edge comprises a front end surface for milling grooves, and the inclination of a first side surface, facing the cutting direction, of the front end surface is 0.2-0.5 degrees smaller than that of a second side surface opposite to the first side surface; and step four, electroplating, and then finely boring the inner circumferential surface of the bearing bush to the size of a finished product. The groove processed by the method has good appearance, the burr generation amount is reduced, and poor combination of the electroplating layer material and the alloy layer material is avoided when the groove is electroplated and filled.
Description
Technical Field
The invention relates to a marine engine bearing bush, in particular to a method for machining a groove of a marine engine bearing bush.
Background
The bearing bush is an important part in the internal part of the marine engine and mainly plays a role in supporting load and transmitting motion. Referring to fig. 1 and 2, the bearing shell is composed of a shell back 1 of an outer ring and an alloy layer 2 of an inner ring, spiral grooves 3 are designed on the surface of the harder alloy layer 2, the grooves 3 spirally extend along the axial direction of the bearing shell at certain intervals, and the grooves 3 are filled with the softer material in an electroplating mode. The interval L between the adjacent grooves is reasonably arranged, a single bearing bush material is not used in a load area, and the harder alloy layer 2 material plays a supporting role, so that the load of the softer electroplated layer 4 material is greatly reduced, the single softer bearing bush material is embedded, the bearing capacity is improved, the wear rate is greatly reduced, and the service life and the wear resistance of the bearing bush are increased.
The alloy layer 2 occupies about 25-33% of the surface area of the inner side surface of the bearing bush, the electroplated layer 4 occupies about 67-75% of the surface area, the alloy layer 2 and the electroplated layer 4 are alternately formed, and the pitch P of the spiral groove 3 is about 0.3-0.5 mm. The forming angle of the groove is generally 60 degrees or 90 degrees, and the depth h of the groove is generally 0.02-0.06 mm.
Burrs are easily generated in the machining process of the groove of the bearing bush at present, the appearance of the groove is further influenced, the combination of the material of the electroplated layer 4 and the material of the alloy layer 2 is poor during electroplating filling, and the service life of the bearing bush is shortened.
Disclosure of Invention
The invention aims to provide a method for processing a groove of a bearing bush of a marine engine, which can be used for processing the groove with good appearance, reducing the generation amount of burrs and avoiding poor combination of an electroplating layer material and an alloy layer material when the groove is electroplated and filled.
The invention relates to a method for processing a bearing bush groove of a marine engine, which comprises the following steps:
firstly, clamping and fixing a bearing bush on a positioning mechanism of a boring machine;
step two, finely boring the inner peripheral surface of the bearing bush;
boring the inner peripheral surface of the bearing bush to form a spiral groove by using a groove boring cutter, wherein the groove boring cutter comprises a cutter handle and a cutting edge connected to the cutter handle, the cutting edge comprises a front end surface for milling grooves, and the inclination of a first side surface, facing the cutting direction, of the front end surface is 0.2-0.5 degrees smaller than that of a second side surface opposite to the first side surface;
and step four, electroplating, and then finely boring the inner circumferential surface of the bearing bush to the size of a finished product.
Further, in the first step, pressure F is applied to two circumferential end faces of the bearing bush, wherein the pressure F = (50-60) × the equivalent wall thickness of the bearing bush × the effective width of the bearing bush, and the joint area between the bearing bush back and the positioning surface of the positioning mechanism is ensured to be larger than or equal to 85%. The state ensures that the shape of the bearing bush is still regular when the bearing bush is restored to a free state after the groove is machined, and the applied pressure F cannot be too large so as to avoid the plastic deformation of parts.
And further, in the second step, a machining allowance of 0.05mm is reserved for fine boring, and the roughness of the inner circumferential surface of the bearing bush after the fine boring is not more than Ra0.8. Through experimental practice, when the machining allowance is 0.05mm, burrs generated by subsequent groove boring are not formed into lines, and are not block-shaped burrs, so that the groove forming is effectively guaranteed.
Further, the technological parameters of the groove boring cutter in the third step are as follows: the linear velocity is 160-200 m/min, the feeding speed of the groove boring cutter is Pmm/r, wherein P is the screw pitch of the spiral groove; the rotating speed of the boring machine spindle is calculated according to the pitch P and the linear speed, the boring machine spindle is guaranteed to rotate for a circle, and the feeding distance of the groove boring cutter is the pitch P.
Further, the back angle of the cutting edge of the groove boring cutter is 3-5 degrees, when the back angle of the cutting edge is too large, the strength is not enough, the abrasion is too fast, and the service life of the groove boring cutter is influenced; when the cutting edge rear angle is too small, the chip removal is difficult, the heating is high, the burrs on the edge of the groove obtained by processing are more, and the electroplating filling combination quality is greatly influenced.
Further, the groove boring cutter is made of hard alloy.
According to the invention, the spiral groove is processed on the inner circumferential surface of the bearing bush by the specific groove boring cutter, so that the problem of cutting burrs is effectively avoided, and a better groove appearance is obtained. When the groove boring cutter is fed in a spiral mode, the cutting direction is extruded and deformed, so that the inclination of a first side surface of the front end surface facing the cutting direction is limited to be 0.2-0.5 degrees smaller than that of a second side surface opposite to the first side surface, cutting burrs are avoided during groove processing, and the combination quality of a plating layer material and an alloy layer material during electroplating filling is guaranteed.
Drawings
FIG. 1 is a schematic view of the shape of a groove of a bearing bush according to the present invention;
FIG. 2 is a schematic cross-sectional view of a bearing shell groove of the present invention;
FIG. 3 is a schematic view of the machining of a bearing shell groove according to the present invention;
FIG. 4 is a second schematic view of the machining of the bearing shell groove of the present invention;
FIG. 5 is a schematic view of the operation of the slot boring tool of the present invention;
FIG. 6 is a schematic view of the construction of the slot boring tool of the present invention;
FIG. 7 is an enlarged partial schematic view of area A of FIG. 6;
figure 8 is a schematic view of the tool relief angle of the groove boring tool of the present invention.
In the figure, 1-tile back, 2-alloy layer, 3-groove, 4-electroplated layer, 5-circumferential end face, 6-boring machine, 7-positioning mechanism, 8-main shaft, 9-fine boring and boring cutter, 10-groove boring cutter, 11-knife handle, 12-knife edge, 13-first side face and 14-second side face.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A machining method for a bearing bush groove of a marine engine comprises the following steps:
step one, referring to fig. 3 and 4, clamping and fixing the bearing bush on a positioning mechanism 7 of a boring machine 6, aligning a positioning surface of the positioning mechanism 7, and ensuring that the concentricity of the center of a main shaft 8 of the boring machine 6 and the positioning mechanism 7 is not more than 0.003 mm. And applying pressure F to two circumferential end surfaces of the bearing bush, and calculating according to the pressure F = (50-60). times the equivalent wall thickness of the bearing bush and the effective width of the bearing bush to obtain that the joint area of the bearing bush back 1 and the positioning surface of the positioning mechanism 7 is more than or equal to 85% when the pressure F is 6000N. The state ensures that the shape of the bearing bush is still regular when the bearing bush is restored to a free state after the groove is machined, and the applied pressure F cannot be too large so as to avoid the plastic deformation of parts.
Fixing a fine boring cutter 9 on a main shaft 8 of a boring machine 6, adjusting the diameter of the fine boring cutter 9, finely boring the inner circumferential surface of the bearing bush, reserving a machining allowance of 0.05mm, cleaning impurities on the surface of the bearing bush, and preventing the impurities from extruding the groove in the groove machining process to cause groove deformation, wherein the roughness of the inner circumferential surface of the bearing bush after fine boring is not more than Ra0.8. Through experimental practice, when the machining allowance is 0.05mm, burrs generated by subsequent groove boring are not formed into lines, and are not block-shaped burrs, so that the groove forming is effectively guaranteed.
And step three, referring to fig. 5 to 8, replacing the fine boring cutter 9 on the main shaft 8 with a groove boring cutter 10, and ensuring that the concentricity of the center of the main shaft 8 and the positioning mechanism 7 is not more than 0.003 mm. Boring the inner circumferential surface of a bearing bush to form a spiral groove 3 by using a groove boring cutter 10, wherein the groove boring cutter 10 comprises a cutter handle 11 and a cutting edge 12 connected to the cutter handle 11, the cutting edge 12 comprises a front end surface for milling a groove, and the inclination of a first side surface 13, facing the cutting direction, of the front end surface is 0.2-0.5 degrees smaller than that of a second side surface 14 opposite to the first side surface 13; taking the groove 3 forming an angle of 60 deg., without angular compensation, the first 13 and second 14 flanks of the front face of the cutting edge 12 are both inclined at 30 deg.. However, when the groove boring cutter 10 is fed in a spiral manner, the cutting direction is extruded and deformed, so that the inclination of a first side surface 13 which limits the front end surface to face the cutting direction is 0.2-0.5 degrees smaller than that of a second side surface 14 which is opposite to the first side surface 13, namely the inclination of the first side surface 13 is 29.5-29.8 degrees, the inclination of the second side surface 14 is 30 degrees, cutting burrs generated during groove processing are effectively avoided, and the combination quality of electroplating filling is ensured.
The cutting edge back angle α of the groove boring cutter 10 is 3-5 degrees, when the cutting edge back angle α is too large, the strength is insufficient, the abrasion is too fast, the service life of the groove boring cutter is influenced, when the cutting edge back angle α is too small, the chip removal is difficult, the heating is high, the machined groove edge has more burrs, and the electroplating filling combination quality is greatly influenced.
The boring technological parameters of the groove boring cutter 10 are as follows: the linear velocity is 200m/min, the feeding speed of the groove boring cutter is P =0.3mm/r, wherein P is the screw pitch of the spiral groove; and calculating according to the pitch P and the linear speed to obtain the rotating speed of the spindle of the boring machine as 600r/min, ensuring that the spindle 8 of the boring machine 6 rotates for a circle, and ensuring that the feeding distance of the groove boring cutter 10 is the pitch P.
Electroplating, replacing the groove boring cutter 10 with a fine boring cutter 9, adjusting the diameter of the fine boring cutter 9, and finely boring the inner circumferential surface of the bearing bush to the size of a finished product.
In the processing method, the material of the bush back 1 of the bearing bush is steel, the material of the alloy layer 2 is aluminum-based bearing alloy or copper-based bearing alloy, and the electroplating of the bush groove is the prior mature technology, and the electroplating is not the focus of the invention, and is not repeated herein.
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, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A machining method for a bearing bush groove of a marine engine is characterized by comprising the following steps:
firstly, clamping and fixing a bearing bush on a positioning mechanism of a boring machine;
step two, finely boring the inner peripheral surface of the bearing bush;
boring the inner peripheral surface of the bearing bush to form a spiral groove by using a groove boring cutter, wherein the groove boring cutter comprises a cutter handle and a cutting edge connected to the cutter handle, the cutting edge comprises a front end surface for milling grooves, and the inclination of a first side surface, facing the cutting direction, of the front end surface is 0.2-0.5 degrees smaller than that of a second side surface opposite to the first side surface;
and step four, electroplating, and then finely boring the inner circumferential surface of the bearing bush to the size of a finished product.
2. The machining method for the bearing bush groove of the marine engine according to claim 1, characterized by comprising the steps of: in the first step, pressure F is applied to two circumferential end faces of the bearing bush, wherein the pressure F = (50-60). times.the equivalent wall thickness of the bearing bush and the effective width of the bearing bush, and the joint area of the bearing bush back and the positioning surface of the positioning mechanism is ensured to be more than or equal to 85%.
3. The machining method for the bearing shell groove of the marine engine according to claim 1 or 2, wherein: and in the second step, a machining allowance of 0.05mm is reserved for fine boring, and the roughness of the inner circumferential surface of the bearing bush after fine boring is not more than Ra0.8.
4. The machining method for the bearing shell groove of the marine engine according to claim 1 or 2, wherein: the technological parameters of the groove boring cutter in the third step are as follows: the linear speed is 160-200 m/min, the feeding speed is Pmm/r, wherein P is the screw pitch of the spiral groove; the rotating speed of the boring machine spindle is calculated according to the pitch P and the linear speed, the boring machine spindle is guaranteed to rotate for a circle, and the feeding distance of the groove boring cutter is the pitch P.
5. The machining method for the bearing shell groove of the marine engine according to claim 1 or 2, wherein: the cutting edge back angle of the groove boring cutter is 3-5 degrees.
6. The machining method for the bearing shell groove of the marine engine according to claim 1 or 2, wherein: the groove boring cutter is made of hard alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357032.6A CN111015117A (en) | 2019-12-25 | 2019-12-25 | Machining method for bearing bush groove of marine engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357032.6A CN111015117A (en) | 2019-12-25 | 2019-12-25 | Machining method for bearing bush groove of marine engine |
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| CN111015117A true CN111015117A (en) | 2020-04-17 |
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| CN201911357032.6A Pending CN111015117A (en) | 2019-12-25 | 2019-12-25 | Machining method for bearing bush groove of marine engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399953A (en) * | 2021-07-15 | 2021-09-17 | 湖南九鼎科技（集团）永州鼎立饲料有限公司 | Main shaft and shaft sleeve machining process convenient to overhaul and disassemble |
| CN113977194A (en) * | 2021-10-21 | 2022-01-28 | 山西平阳重工机械有限责任公司 | Process method for preventing solid solution deformation of shell |
| CN114101738A (en) * | 2021-11-29 | 2022-03-01 | 重庆跃进机械厂有限公司 | Fine boring method for inner hole of white alloy bearing bush |
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| US20080031730A1 (en) * | 2006-06-21 | 2008-02-07 | Snecma | Bearing for variable pitch stator vane |
| CN101275606A (en) * | 2008-01-22 | 2008-10-01 | 重庆跃进机械厂 | Manufacturing process of high-power low-speed diesel shaft bushing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399953A (en) * | 2021-07-15 | 2021-09-17 | 湖南九鼎科技（集团）永州鼎立饲料有限公司 | Main shaft and shaft sleeve machining process convenient to overhaul and disassemble |
| CN113977194A (en) * | 2021-10-21 | 2022-01-28 | 山西平阳重工机械有限责任公司 | Process method for preventing solid solution deformation of shell |
| CN113977194B (en) * | 2021-10-21 | 2023-10-13 | 山西平阳重工机械有限责任公司 | Technological method for preventing solid solution deformation of shell |
| CN114101738A (en) * | 2021-11-29 | 2022-03-01 | 重庆跃进机械厂有限公司 | Fine boring method for inner hole of white alloy bearing bush |
| CN114101738B (en) * | 2021-11-29 | 2024-02-27 | 重庆跃进机械厂有限公司 | Fine boring method for inner hole of white alloy bearing bush |
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Application publication date: 20200417 |
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