CN102451919B - Process for machining wearing ring of cylinder liner of large low-speed marine diesel engine - Google Patents
Process for machining wearing ring of cylinder liner of large low-speed marine diesel engine Download PDFInfo
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- CN102451919B CN102451919B CN 201110079713 CN201110079713A CN102451919B CN 102451919 B CN102451919 B CN 102451919B CN 201110079713 CN201110079713 CN 201110079713 CN 201110079713 A CN201110079713 A CN 201110079713A CN 102451919 B CN102451919 B CN 102451919B
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Abstract
The invention discloses a process for machining a wearing ring of a cylinder liner of a large low-speed marine diesel engine. Radial clamping force which is applied by a clamping jaw for machining of a vertical lathe to the wearing ring is converted into axial clamping force applied to the wearing ring through a novel fixture to ensure that the action point of the clamping force is separated from the machining surface of a blank, and a workpiece is machined in a free state. Therefore, the phenomenon that the workpiece is deformed after the radial clamping force is applied to finish machining can be avoided. By repeatedly adjusting cutting parameters and process steps of a machine tool, the resonance amplitude is reduced so as to guarantee stable cutting and quality. The stress influence which is produced during turning can be eliminated in a mode of increasing processing frequency of a semi-finished product. Before finish machining and forming, stress deformation is eliminated through one-time heat treatment, so slight deformation caused by machining can be eliminated, and inner stress of the workpiece can be released quickly and balance is achieved.
Description
Technical field:
The present invention relates to a kind of wear-resisting ring processing technology.
Background technology:
The large-sized low-speed marine diesel, arranges and has inlayed wear ring on cylinder jacket of diesel engine top for the heel and toe wear of the relevant parts that strengthen its diesel engine.Facts have proved that the setting of wear ring has very important effect to the heel and toe wear of the relevant parts that suppress diesel engine.
The RTA wear-resisting ring, its external diameter is
Wall thickness only is 8-10mm, and the upper end is 20 ° of grooves, the R10 arc transition, and also dimensional tolerance and surface roughness require very strictly, belongs to typical major diameter, thin-wall parts.This major diameter, the processing of thin-wall parts is the difficult point in China's machining always, at present the domestic technology that does not still have moulding that can reference can be used for reference.Because its diameter is large, wall is very thin, very easily produce distortion in the process of clamping, so dimensional accuracy is wayward; In addition, in mechanical processing process, also produce easily resonance, improper if cutting parameter is selected, surface roughness is difficult to guarantee.If can not guarantee dimensional accuracy and the surface roughness of cylinder sleeve wear ring, will directly have influence on the operating efficiency of marine diesel.
Therefore, for a long time, the cylinder sleeve wear ring all is to rely on import.Flourish along with international shipbuilding industry, the price of the import parts of marine diesel is rising steadily, and amount of increase is surprising, and this has increased the cost of plant construction marine engine undoubtedly.
Summary of the invention:
The present invention is directed to the above-mentioned deficiency of prior art, provide a kind of and can avoid fixing and add man-hour yielding, eliminate the wear-resisting ring processing technology of resonance.
Technical solution of the present invention is: a kind of wear-resisting ring processing technology, implement in accordance with the following steps:
A, manufacturing wear ring blank, the length of blank is the long 20-60mm of blank more in the past;
One end face of b, the flat cylinder sleeve wear ring of car blank, and car goes out cylindrical centering ring; At distance car planar end surface 10mm place, process a wide 15mm, the technique annular groove of dark 10mm;
C, carry out clamping, above-mentioned workpiece is passed through the novel clamp clamping on vertical lathe, novel clamp is provided with circular platform, on circular platform, by bolt equally distributed pressing plate is installed, above-mentioned workpiece is placed on the circular platform of this device, pressing plate is inserted in the dark technique annular groove of 15 * 10mm of blank cylindrical lower end, utilize dial gauge on the wear ring cylindrical the centering ring that goes out of car as benchmark, behind the centering, again pressing plate is fastened with bolt clip, then novel clamp is placed on the rotating workbench of vertical lathe, with the claw of lathe it is fixedly clamped;
D, carry out roughing, in that the turning inside and outside circle is monolateral when staying the 2mm surplus, heat-treat, eliminate machining stress;
E, carry out semifinishing, after machining stress is eliminated in heat treatment, the car planar base surface, push down annular groove with the homalocephalus pressing plate is fixed on the cylinder sleeve wear ring on the circular platform with being evenly distributed, utilize dial gauge to beat the wear ring cylindrical again behind the centering, take the upper surface as benchmark, semifinishing inside and outside circle diameter, staying the monolateral surplus of inside and outside circle is 0.8-1mm, and the overall length size is greater than finished size;
F, carry out fine finishining, first processing excircles diameter finished product is used as processing the benchmark of interior circular diameter upper end groove, circular arc, finish turning internal diameter finished product again, and then the inner diameter turning upper end is 20 ° of grooves, R10 circular arc finished product.
The present invention adopts novel clamp will process the clamping claw of vertical lathe lathe to the radially chucking power of wear ring, converts the axial chucking power to wear ring to, makes the chucking power application point leave the machined surface of blank, allows workpiece carry out machining under the free state being in.Thereby avoided workpiece because acting on the deformation that produces after the fine finishining from chucking power radially.Cutting parameter and the work step of the present invention by repeatedly adjusting lathe reduces resonance amplitude, to reach stably cutting, stable quality.Adopt the mode that increases semi-finished product processing number of times, eliminate the stress influence that in turning process, produces.And before the fine finishining moulding, carry out a stress-relieving by beat treatment distortion, and with the micro-deformation that solution has machined to cause, the internal stress of workpiece is discharged as early as possible, reach balance.
Description of drawings:
Fig. 1 is the structural representation of novel clamp of the present invention.
The specific embodiment:
Further specify embodiments of the invention below in conjunction with accompanying drawing.
The 7RTA72U-B type ship is as follows with diesel cylinder sleeve wear ring processing technology:
A, select external diameter to be
Internal diameter is
Length is the 35CrMoA forging blank of 165mm.For eliminate the stress influence that produces in turning process, blank inside and outside circle surplus should be not too small.
One end face of b, the flat cylinder sleeve wear ring of car blank, and car goes out cylindrical centering ring; At distance car planar end surface 10mm place, process a wide 15mm, the technique annular groove of dark 10mm;
C, carry out clamping: above-mentioned workpiece is passed through the novel clamp clamping on vertical lathe, as shown in Figure 1, novel clamp is provided with circular platform 1, on circular platform 1, by bolt 2 six equally distributed contour homalocephalus pressing plates 3 are installed, above-mentioned workpiece is placed on the circular platform of this device, pressing plate is inserted in the dark technique annular groove of 15 * 10mm of blank cylindrical lower end, utilize dial gauge on the wear ring cylindrical the centering ring that goes out of car as benchmark, behind the centering, again the homalocephalus pressing plate is fastened with bolt clip, then novel clamp is placed on the rotating workbench of vertical lathe 4, with the claw 5 of lathe it is fixedly clamped;
D, carry out roughing: when rough turn inside and outside circle diameter, four jiaos of blades of the domestic carbide alloy R1.2 of choice for use consider that allowance is larger, and Cutting parameters is selected: rotating speed is 36rev/min, and the amount of feeding is 0.3mm/rev, and the depth of cut is 5-6mm.When rough turn, in order to reach the surface roughness requirement in the drawing, also carried out the turning cross-over experiment.The Sandvik overlord blade of choice for use import draws the cutting parameter that can satisfy the surface roughness requirement in the drawing that uses when fine finishining.Because turning adds man-hour, inside parts can produce machining stress, after preventing the turning finished product, and machining stress release and cause wear ring inside and outside circle size distortion, in that the turning inside and outside circle is monolateral when staying the 2mm surplus, heat-treat and eliminate machining stress.
E, carry out semifinishing: after machining stress was eliminated in heat treatment, the car planar base surface was pushed down annular groove with the homalocephalus pressing plate with being evenly distributed the cylinder sleeve wear ring is fixed on the black iron mold, utilized dial gauge to beat the wear ring cylindrical again behind the centering, carried out half finish turning.During half finish turning, use the Sandvik R0.8 carbide alloy diamond shaped insert of import, select Cutting parameters: revolution is 40rev/min, and the amount of feeding is 0.15mm/rev, and the depth of cut is 0.5mm.The processing upper surface is as the overall length benchmark.Take the upper surface as benchmark, semifinishing inside and outside circle diameter, staying the monolateral surplus of inside and outside circle is 0.8-1mm, the large and finished size of overall length size.
F, carry out fine finishining: add man-hour at finished product, use the Sandvik R0.4 carbide alloy diamond shaped insert of import.Use adds man-hour at semi-finished product, and the cutting parameter that experiment obtains: revolution is 50rev/min, and the amount of feeding is 0.12mm/rev, and the depth of cut is 0.4-0.5mm, processes at twice the inside and outside circle finished product.Because internal diameter upper end is 20 ° of grooves, the R10 arc transition is so first processing excircles diameter finished product is used as processing the benchmark of interior circular diameter upper end groove, circular arc.Finish turning internal diameter finished product is used the 7RTA72U-B type ship of establishment with main engine jacket wear ring processing dedicated program, is 20 ° of grooves on the inner diameter turning, R10 circular arc finished product.
Effect checks:
Behind the inside and outside circle processed finished products, when not unclamping anchor clamps, use the actual processing dimension of outside micrometer measurement external diameter to be
Using the actual processing dimension of outside micrometer wall-thickness measurement is 9.1
+ 0.04Mm; Size and surface roughness have all satisfied drawing requirement.After unclamping anchor clamps, using outside micrometer to measure external diameter and wall thickness dimension, the size of measuring during with clamping differs 0.01～0.02mm, satisfies layout design and instructions for use.
Claims (1)
1. wear-resisting ring processing technology is characterized in that: implement in accordance with the following steps:
A, manufacturing wear ring blank, the length of blank is the long 20-60mm of blank more in the past;
One end face of b, the flat cylinder sleeve wear ring of car blank, and car goes out cylindrical centering ring; At distance car planar end surface 10mm place, process a wide 15mm, the technique annular groove of dark 10mm;
C, carry out clamping, the wear ring blank is passed through the novel clamp clamping on vertical lathe, novel clamp is provided with circular platform (1), by bolt (2) equally distributed pressing plate (3) is installed at circular platform (1), the wear ring blank is placed on the circular platform of novel clamp, pressing plate is inserted in the dark technique annular groove of 15 * 10mm of blank cylindrical lower end, utilize dial gauge on the wear ring cylindrical the centering ring that goes out of car as benchmark, behind the centering, again pressing plate is fastened with bolt clip, then novel clamp is placed on the rotating workbench of vertical lathe (4), with the claw (5) of lathe it is fixedly clamped;
D, carry out roughing, in that the turning inside and outside circle is monolateral when staying the 2mm surplus, heat-treat, eliminate machining stress;
E, carry out semifinishing, after machining stress is eliminated in heat treatment, the car planar base surface, push down annular groove with the homalocephalus pressing plate is fixed on the cylinder sleeve wear ring on the circular platform with being evenly distributed, utilize dial gauge to beat the wear ring cylindrical again behind the centering, take the upper surface as benchmark, semifinishing inside and outside circle diameter, staying the monolateral surplus of inside and outside circle is 0.8-1mm, and the overall length size is greater than finished size;
F, carry out fine finishining, first processing excircles diameter finished product is used as processing the benchmark of interior circular diameter upper end groove, circular arc, finish turning internal diameter finished product again, and then the inner diameter turning upper end is 20 ° of grooves, R10 circular arc finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110079713 CN102451919B (en) | 2011-03-31 | 2011-03-31 | Process for machining wearing ring of cylinder liner of large low-speed marine diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110079713 CN102451919B (en) | 2011-03-31 | 2011-03-31 | Process for machining wearing ring of cylinder liner of large low-speed marine diesel engine |
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| CN102451919A CN102451919A (en) | 2012-05-16 |
| CN102451919B true CN102451919B (en) | 2013-04-24 |
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| CN103737395A (en) * | 2013-12-23 | 2014-04-23 | 杭州创兴织造设备科技有限公司 | Machining clamp for axially symmetrical workpieces |
| CN106694906B (en) * | 2015-11-13 | 2018-11-02 | 首都航天机械公司 | A kind of large diameter thin wall fork ring processing method |
| CN105855951A (en) * | 2016-06-13 | 2016-08-17 | 镇江市富德数控机床科技有限公司 | Fixture platform for computer numerical control machine tool |
| CN107470653A (en) * | 2017-09-08 | 2017-12-15 | 苏州联开精密模具有限公司 | A kind of processing unit (plant) and its processing method of preform mould die lip support ring |
| CN109623648B (en) * | 2019-01-03 | 2020-03-17 | 武汉船用机械有限责任公司 | Processing method of shaft parts |
| CN110280782B (en) * | 2019-06-20 | 2020-09-11 | 中国航发贵州黎阳航空动力有限公司 | Machining method of thin-wall part |
| CN110757094B (en) * | 2019-10-31 | 2020-11-24 | 中航飞机起落架有限责任公司 | Turning method of cylindrical stepped thin-wall part |
| CN111730065A (en) * | 2020-07-17 | 2020-10-02 | 浙江临海浙富电机有限公司 | New energy automobile motor shell turning process |
| CN114192810A (en) * | 2021-12-21 | 2022-03-18 | 烟台万隆真空冶金股份有限公司 | End ring turning process |
| CN115415755A (en) * | 2022-10-12 | 2022-12-02 | 中航动力株洲航空零部件制造有限公司 | Anti-deformation machining process for thin-wall parts of engine |
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| US4567695A (en) * | 1983-03-29 | 1986-02-04 | Ina Walzlager Schaeffler Kg | Method and apparatus for machining roller bearings |
| CN2801374Y (en) * | 2005-07-14 | 2006-08-02 | 太原钢铁(集团)有限公司 | Turning clamp for iron sheet magnetic ring sample |
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| CN101659002A (en) * | 2009-09-04 | 2010-03-03 | 重庆清平机械厂 | Thin-wall annular gear processing method |
| CN201471175U (en) * | 2009-07-10 | 2010-05-19 | 江苏扬子江船厂有限公司 | Processing anti-deformation fixture with large-diameter and thin-wall for large and middle-size ship rudder stock |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8087675B2 (en) * | 2006-08-24 | 2012-01-03 | Korson Daniel G | Chuck holder incorporating independent arrayed wedge clamps for clamping such as irregularly shaped and thin wall parts with a minimum of deformation |
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2011
- 2011-03-31 CN CN 201110079713 patent/CN102451919B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4567695A (en) * | 1983-03-29 | 1986-02-04 | Ina Walzlager Schaeffler Kg | Method and apparatus for machining roller bearings |
| CN2801374Y (en) * | 2005-07-14 | 2006-08-02 | 太原钢铁(集团)有限公司 | Turning clamp for iron sheet magnetic ring sample |
| CN201073739Y (en) * | 2007-09-28 | 2008-06-18 | 济南一机床集团有限公司 | Numerical control vertical lathe fixture |
| CN201471175U (en) * | 2009-07-10 | 2010-05-19 | 江苏扬子江船厂有限公司 | Processing anti-deformation fixture with large-diameter and thin-wall for large and middle-size ship rudder stock |
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| CN102451919A (en) | 2012-05-16 |
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