CN110614389A - Boring processing method for crosshead bearing cover of large-scale low-speed marine diesel engine - Google Patents
Boring processing method for crosshead bearing cover of large-scale low-speed marine diesel engine Download PDFInfo
- Publication number
- CN110614389A CN110614389A CN201910997943.9A CN201910997943A CN110614389A CN 110614389 A CN110614389 A CN 110614389A CN 201910997943 A CN201910997943 A CN 201910997943A CN 110614389 A CN110614389 A CN 110614389A
- Authority
- CN
- China
- Prior art keywords
- crosshead bearing
- size
- bearing cover
- hole
- white alloy
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
Abstract
A boring processing method for a crosshead bearing cover of a large-scale low-speed marine diesel engine is characterized in that a mould body is arranged on a working table of a boring machine to be leveled and aligned; placing the white alloy strips in a groove at the upper corner of the end face of the mould body, wherein the distance between the two white alloy strips is at least 6mm smaller than the size of the hole of the crosshead bearing cover, and fixing the white alloy strips by using bolts; placing the crosshead bearing cover on a horizontal joint surface of the mould body, enabling the end surface to lean against a positioning surface of the mould body, and installing a connecting bolt, a fixed gland and a fastening nut into a screw hole to fix the crosshead bearing cover; processing an inner hole of the crosshead bearing cap and a white alloy strip by using a boring mill, processing the white alloy strip and the inner hole of the crosshead bearing cap to the same size in the same tool, measuring the size between two ends of the white alloy strip, and obtaining the size of the inner hole of the crosshead bearing cap; the radius size can be obtained from the dimension from the rechecking surface to the upper end of the bore hole of the crosshead bearing cover, repeated alignment and reference determination are not needed, and the diameter size of the bearing hole can be accurately measured.
Description
Technical Field
The invention relates to a method for processing a crosshead bearing cap of a large-sized low-speed marine diesel engine, in particular to a method for processing a bearing hole of the crosshead bearing cap.
Background
The crosshead bearing cover of the large-scale low-speed marine diesel engine is characterized in that a workpiece bearing hole is made of white alloy, the size of the workpiece bearing hole is different from that of a connecting rod bearing hole, the bearing hole of the crosshead bearing cover needs to be processed independently, a large amount of time needs to be wasted in aligning before the bearing hole is processed and determining a processing standard, and because the number of the crosshead bearing covers of each low-speed diesel engine is large, each crosshead bearing cover needs to be processed after being aligned independently according to the boring processing method, and the crosshead bearing cover is not suitable for batch production. The crosshead bearing cover is in the shape of a standard semicircle, the dimensional accuracy requirement is high, and the tolerance is withinOn the left and right sides, because not the full circle or major arc shape, it is a difficult problem to measure the diameter of dead eye during processing, often can appear because of measuring inaccurate and lead to the condition that the product is out of tolerance, consequently machining efficiency is low and the quality problem appears easily in the production process.
Disclosure of Invention
Aiming at the defects of the processing, the invention provides the boring processing method of the crosshead bearing cover of the large-scale low-speed marine diesel engine, which has a simple structure, does not need to align and determine the reference for multiple times before processing and can accurately measure the diameter of the bearing hole.
The technical solution of the invention is as follows:
a boring processing method for a crosshead bearing cover of a large-scale low-speed marine diesel engine is characterized by comprising the following steps: placing the lower surface of a mould body of a special mould on a boring machine worktable, leveling according to a horizontal joint surface of the mould body and the boring machine worktable, aligning according to two positioning surfaces on the end surface of the mould body, and clamping and fixing the mould body on the worktable;
placing the white alloy strips in a white alloy placing groove at the upper corner of the end face of the mould body, wherein the white alloy strips are made of the same material as the inner hole of the crosshead bearing cover, adjusting the positions of the lily gold strips, ensuring that the distance between the two white alloy strips is at least 6mm smaller than the size of the crosshead bearing cover hole, and fixing the alloy strips by using bolts above;
placing a crosshead bearing cover workpiece to be processed on horizontal joint surfaces on two sides of a semicircular hole of a clamping fixture body, wherein the end surface of one side of the workpiece is close to a raised positioning surface at one end of the clamping fixture body and is detected by a feeler gauge, and a 0.02mm feeler gauge strip cannot enter the positioning surface;
after the crosshead bearing cover is in butt joint with the horizontal joint surface of the mould body, connecting bolts, fixing pressing covers and fastening nuts are sequentially arranged in through holes on two sides of the crosshead bearing cover and screw holes corresponding to the horizontal joint surface of the mould body, the crosshead bearing cover is fastened and fixed, the feeler gauge is used for detecting the positioning surface again for overhauling, and a 0.02mm feeler gauge strip cannot enter;
processing an inner hole of the crosshead bearing cap and a white alloy strip by using a boring machine, processing the white alloy strip and the inner hole of the crosshead bearing cap to the same size in the same step in the processing process, and measuring the size between the two opposite ends of the two lily strips by using an inside micrometer to obtain the size of the inner hole of the crosshead bearing cap; the size H from the rechecking surface to the horizontal joint surface of the clamping fixture body is determined and accurate, when the boring hole of the crosshead bearing cover is machined, the size from the rechecking surface to the upper end of the boring hole of the crosshead bearing cover is measured, and then the H is subtracted, so that the radius size of the boring hole of the crosshead bearing cover is obtained. The manufacturing process, white alloy strip and the crosshead bearing cap simultaneous processing on the central line about the dead eye on the position, and lily gold strip width be 20mm, can form effectual measuring area after the processing, carry out the size measurement to the diameter between two relative both ends of white alloy strip, just can learn the size of the hole diameter of crosshead bearing cap, measure more conveniently.
A mould related to a boring method of a crosshead bearing cover of a large-scale low-speed marine diesel engine is characterized in that the mould is made of an HT200 casting, white alloy strip placing grooves are respectively arranged at two ends of the center of a mould body, two threaded holes are respectively formed in the tops of the grooves, positioning surfaces and clearance grooves are formed in the backs of the two white alloy strip placing grooves, a hole center rechecking surface is formed in the bottom of the center of the mould, and four connecting threaded holes are formed in the upper plane of the mould. The material of the white alloy strip is the same as that of the bearing hole white alloy layer, and the size error caused by different processing materials can be avoided when the cutter is debugged.
According to the invention, white alloy is placed in the white alloy strip placing groove, and the alloy strip is fixed by using bolts; then placing a crosshead bearing cap to be processed on the clamping fixture, enabling the end face of one side of the workpiece to lean against the positioning surface, and clamping; before processing, setting a tool on a white alloy strip, and adjusting the size of the tool; and (5) rechecking the size from the top of the workpiece to the top of the clamping fixture after machining, and determining the hole center of the bearing hole. The invention does not need to align and determine the benchmark for multiple times before processing, can accurately measure the diameter size of the bearing hole and ensures the processing precision.
Drawings
FIG. 1 is a schematic structural diagram of a mold body of a boring processing method of a crosshead bearing cover of a large-scale low-speed marine diesel engine according to the invention;
the position names in fig. 1 are: 11 white alloy placing grooves, 12 blank grooves, 13 hole center rechecking surfaces and 14 threaded holes for fixing bearing covers;
FIG. 2 is a view showing a use state of a mold in the boring method of the crosshead bearing cap of the large-sized low-speed marine diesel engine;
the location names in fig. 2 are: the fixture comprises a cross head bearing cover 1, a bearing cover fixing bolt 2, a connecting bolt 3, a fixing gland 4, a white alloy strip fixing bolt 5, a white alloy strip 6 and a mould body 7.
Detailed Description
The design of the present invention is further explained below with reference to the accompanying drawings.
A method for boring a crosshead bearing cap of a large-sized low-speed marine diesel engine is suitable for small-batch production and machining, wherein before machining, a mold is placed on a worktable of a boring machine, horizontal alignment is conducted according to a horizontal joint surface of the mold, alignment is conducted according to two positioning surfaces of an end surface of the mold, and the mold is clamped and fixed on the worktable. Thus, the lower surface of the mould body is arranged on a boring machine worktable, the horizontal joint surface of the mould body and the boring machine worktable is leveled, the two positioning surfaces on the end surface of the mould body are aligned, and the mould body is clamped and fixed on the worktable.
Placing the white alloy strips in a white alloy placing groove at the upper corner of the end face of the mould body, wherein the white alloy strips are made of the same material as the inner hole of the crosshead bearing cover, adjusting the positions of the lily gold strips, ensuring that the distance between the two white alloy strips is at least 6mm smaller than the size of the crosshead bearing cover hole, and fixing the alloy strips by using bolts above; placing a crosshead bearing cap workpiece to be processed on a semicircular hole of a clamping fixture body,
one side end face of the workpiece is close to the positioning surface, and the feeler gauge is used for detecting, and a 0.02mm feeler gauge strip does not enter.
And sequentially installing connecting bolts, fixing glands and fastening bolts, fastening and fixing the crosshead bearing cap by using a wrench, detecting the positioning surface by using the feeler gauge again, and overhauling the feeler gauge strip with the thickness of 0.02 mm.
And (3) processing the inner hole of the crosshead bearing cap and the white alloy strip by using a boring machine, processing the white alloy strip and the inner hole of the crosshead bearing cap to the same size in the same step in the processing process, and measuring the diameter size of the position of the lily gold strip by using an inside micrometer so as to obtain the size of the inner hole of the crosshead bearing cap.
The size H from the re-detection surface to the horizontal joint surface of the clamping fixture is determined and accurate, when the bore hole of the crosshead bearing cover is machined, the size from the re-detection surface to the upper end of the bore hole of the crosshead bearing cover is measured, and the radius size of the bore hole of the crosshead bearing cover is obtained by subtracting the H. And (3) processing the inner hole of the crosshead bearing cover and the white alloy strip by using a boring machine, and measuring the size from the bottom rechecking surface of the clamping fixture to the top of the inner hole of the bearing cover in the processing process, so that the size of the crosshead bearing hole can be rechecked and determined until the finished product size required by a drawing is processed.
Claims (2)
1. The boring processing method of the crosshead bearing cover of the large-scale low-speed marine diesel engine is characterized by comprising the following steps of: placing the lower surface of a mould body of a special mould on a boring machine worktable, leveling according to a horizontal joint surface of the mould body and the boring machine worktable, aligning according to two positioning surfaces on the end surface of the mould body, and clamping and fixing the mould body on the worktable;
placing the white alloy strips in a white alloy placing groove at the upper corner of the end face of the mould body, wherein the white alloy strips are made of the same material as the inner hole of the crosshead bearing cover, adjusting the positions of the lily gold strips, ensuring that the distance between the two white alloy strips is at least 6mm smaller than the size of the crosshead bearing cover hole, and fixing the alloy strips by using bolts above;
placing a crosshead bearing cover workpiece to be processed on horizontal joint surfaces on two sides of a semicircular hole of a clamping fixture body, wherein the end surface of one side of the workpiece is close to a raised positioning surface at one end of the clamping fixture body and is detected by a feeler gauge, and a 0.02mm feeler gauge strip cannot enter the positioning surface;
after the crosshead bearing cover is in butt joint with the horizontal joint surface of the mould body, connecting bolts, fixing pressing covers and fastening nuts are sequentially arranged in through holes on two sides of the crosshead bearing cover and screw holes corresponding to the horizontal joint surface of the mould body, the crosshead bearing cover is fastened and fixed, the feeler gauge is used for detecting the positioning surface again for overhauling, and a 0.02mm feeler gauge strip cannot enter;
processing an inner hole of the crosshead bearing cap and a white alloy strip by using a boring machine, processing the white alloy strip and the inner hole of the crosshead bearing cap to the same size in the same step in the processing process, and measuring the size between the two opposite ends of the two lily strips by using an inside micrometer to obtain the size of the inner hole of the crosshead bearing cap; the size H from the rechecking surface to the horizontal joint surface of the clamping fixture body is determined and accurate, when the boring hole of the crosshead bearing cover is machined, the size from the rechecking surface to the upper end of the boring hole of the crosshead bearing cover is measured, and then the H is subtracted, so that the radius size of the boring hole of the crosshead bearing cover is obtained.
2. A method for boring a crosshead bearing cap of a large-sized low-speed marine diesel engine according to claim 1, wherein: the manufacturing process, white alloy strip and the crosshead bearing cap simultaneous processing on the central line about the dead eye on the position, and lily gold strip width be 20mm, can form effectual measuring area after the processing, carry out the size measurement to the diameter between two relative both ends of white alloy strip, just can learn the size of the hole diameter of crosshead bearing cap, measure more conveniently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910997943.9A CN110614389B (en) | 2019-10-21 | 2019-10-21 | Boring processing method for crosshead bearing cover of large-scale low-speed marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910997943.9A CN110614389B (en) | 2019-10-21 | 2019-10-21 | Boring processing method for crosshead bearing cover of large-scale low-speed marine diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110614389A true CN110614389A (en) | 2019-12-27 |
| CN110614389B CN110614389B (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910997943.9A Active CN110614389B (en) | 2019-10-21 | 2019-10-21 | Boring processing method for crosshead bearing cover of large-scale low-speed marine diesel engine |
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Citations (10)
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| CN101658997A (en) * | 2008-08-26 | 2010-03-03 | 兰州金牛轨道交通装备有限责任公司 | Method for repairing and processing bearing hole of main bearing cap of diesel engine body of diesel locomotive |
| CN201483251U (en) * | 2009-07-06 | 2010-05-26 | 广西玉柴机器股份有限公司 | Hole boring clamp for rocker shaft of cylinder head of diesel engine |
| CN101758360A (en) * | 2009-12-11 | 2010-06-30 | 沪东重机有限公司 | Repairing and processing method of main bearing hole on stand of diesel engine for ship |
| CN202846257U (en) * | 2012-10-31 | 2013-04-03 | 西南计算机有限责任公司 | Quick tool setting device in hole boring |
| CN104625879A (en) * | 2014-12-01 | 2015-05-20 | 石阳阳 | Method for machining inner arc surface of part |
| CN204584785U (en) * | 2015-03-30 | 2015-08-26 | 沪东重机有限公司 | Marine diesel cross head bearing lid processing aid |
| CN107671321A (en) * | 2017-11-16 | 2018-02-09 | 陕西启源科技发展有限责任公司 | Part inner arc surface processing method |
| CN109773431A (en) * | 2019-03-29 | 2019-05-21 | 中信戴卡股份有限公司 | The processing method of the split type cowl hood cap assemblies of engine |
| KR101991873B1 (en) * | 2019-03-04 | 2019-06-21 | 정동한 | Manufacturing apparatus and method for bearing cap |
| CN209180242U (en) * | 2018-10-31 | 2019-07-30 | 中船动力研究院有限公司 | A kind of main bearing mounting structure and diesel engine of marine low speed diesel engine |
-
2019
- 2019-10-21 CN CN201910997943.9A patent/CN110614389B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101658997A (en) * | 2008-08-26 | 2010-03-03 | 兰州金牛轨道交通装备有限责任公司 | Method for repairing and processing bearing hole of main bearing cap of diesel engine body of diesel locomotive |
| CN201483251U (en) * | 2009-07-06 | 2010-05-26 | 广西玉柴机器股份有限公司 | Hole boring clamp for rocker shaft of cylinder head of diesel engine |
| CN101758360A (en) * | 2009-12-11 | 2010-06-30 | 沪东重机有限公司 | Repairing and processing method of main bearing hole on stand of diesel engine for ship |
| CN202846257U (en) * | 2012-10-31 | 2013-04-03 | 西南计算机有限责任公司 | Quick tool setting device in hole boring |
| CN104625879A (en) * | 2014-12-01 | 2015-05-20 | 石阳阳 | Method for machining inner arc surface of part |
| CN204584785U (en) * | 2015-03-30 | 2015-08-26 | 沪东重机有限公司 | Marine diesel cross head bearing lid processing aid |
| CN107671321A (en) * | 2017-11-16 | 2018-02-09 | 陕西启源科技发展有限责任公司 | Part inner arc surface processing method |
| CN209180242U (en) * | 2018-10-31 | 2019-07-30 | 中船动力研究院有限公司 | A kind of main bearing mounting structure and diesel engine of marine low speed diesel engine |
| KR101991873B1 (en) * | 2019-03-04 | 2019-06-21 | 정동한 | Manufacturing apparatus and method for bearing cap |
| CN109773431A (en) * | 2019-03-29 | 2019-05-21 | 中信戴卡股份有限公司 | The processing method of the split type cowl hood cap assemblies of engine |
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| Publication number | Publication date |
|---|---|
| CN110614389B (en) | 2021-01-22 |
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