CN110618654B - Numerical control machining method for crank arm of crankshaft of medium-speed diesel engine - Google Patents
Numerical control machining method for crank arm of crankshaft of medium-speed diesel engine Download PDFInfo
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- CN110618654B CN110618654B CN201910921787.8A CN201910921787A CN110618654B CN 110618654 B CN110618654 B CN 110618654B CN 201910921787 A CN201910921787 A CN 201910921787A CN 110618654 B CN110618654 B CN 110618654B
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- crankshaft
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
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Abstract
The invention discloses a numerical control machining method of a crank arm of a crankshaft of a medium-speed diesel engine, which comprises the following steps of: 1) clamping the crankshaft and establishing a coordinate system; 2) setting cutting parameters of a cutter, and offsetting the cutter in the Y direction by a distance R; 3) moving the cutter to an optional initial position C point, wherein a projection included angle between a connecting line of the C point and a point E of the arc center of the crank arm of the crankshaft and a connecting line of a point O and a point E of the center of the main journal is P, and P is an initial included angle; 4) when the cutter is arranged at the point C, obtaining a coordinate system X value and a coordinate system Y value of the cutter; 5) setting an indexing variable Q to obtain the coordinate relation of the final motion track of the cutter; 6) the dedicated macro program is edited and run. The invention has simple operation and high processing efficiency. When the crank arms with different phases of the crank shaft are machined, the crank arms with different phases only need to be rotated to the initial positions, the macro program is directly operated, the accumulated error generated by the adjusting tool is eliminated, the machining error of the crank arm is small, the machining precision is high, and the product percent of pass can be greatly improved.
Description
Technical Field
The invention relates to a numerical control machining method of a marine crankshaft, in particular to a numerical control machining method of a crank arm of a crankshaft of a medium-speed diesel engine, and belongs to the technical field of numerical control machining.
Background
The crankshaft is one of key parts on the marine diesel engine, and the quality of the crankshaft directly influences the overall quality of the diesel engine. Because bent axle connecting lever processing belongs to eccentric processing, ordinary processing equipment just can process with the help of eccentric equipment, and when processing bent axle different phase connecting lever at every turn, needs the manual work to adjust the frock, and not only complex operation consumes time and consumes power, work efficiency is low, and the accumulative error that many times frock adjustment produced is big moreover, and it is big to lead to bent axle connecting lever machining error, and the product percent of pass is low.
Disclosure of Invention
The invention aims to provide a numerical control machining method of a crank arm of a crankshaft of a medium-speed diesel engine, which is simple to operate, high in machining efficiency and small in machining error.
The invention is realized by the following technical scheme:
a numerical control processing method of a crank arm of a crankshaft of a medium-speed diesel engine comprises the following steps:
1) adjusting the crankshaft to a turning and milling composite machining center, clamping and establishing a coordinate system;
2) and (5) calling a special milling cutter to mill the crank arm of the crankshaft. Setting cutting parameters of a cutter, and offsetting the cutter in a Y direction by a distance R;
3) the cutter is operated to any initial position C point, the C point is any safe position point on the arc extension line of the crank arm of the crankshaft, the projection included angle between the connecting line of the C point and the arc center E point of the crank arm and the connecting line of the center O point and the E point of the main journal is P, and the angle P is defined as the initial included angle;
4) when the tool is placed at the point C, the X value and the Y value of the coordinate system of the tool are respectively as follows:
X=162.98*cos(P)+360
Y=162.98*sin(P)-R
wherein the coefficient 162.98 is the projection distance from the arc center of the crank arm of the crankshaft to the center X direction of the main shaft;
5) the indexing of the rotation of the tool and the rotation of the workpiece is set to be one degree, an indexing variable Q is set every time the rotation angle is increased by one degree, and the coordinate relation of the final motion track of the tool is as follows:
X=(162.98*cos((P+Q)*(-1)))+360；
Y=((162.98*sin((P+Q)*(-1))-R)
in the above formula, 1 is the rotation direction of the cutter;
6) editing a special macro program, and taking the horizontal direction coordinate Y value and the vertical direction coordinate X value of the cutter in the step 5) as the running track of the cutter to obtain a cutter processing path;
7) and (5) operating a special macro program to process the crank arm circular arc of the crankshaft.
The object of the invention is further achieved by the following technical measures.
In the numerical control machining method for the crank arm of the crankshaft of the medium-speed diesel engine, in the step 1), the rotation center of the machine tool is at the point O of the center of the main journal, in the machining process, the workpiece rotates around the point O of the center of the main journal, the cutter rotates around the point E of the arc center of the crank arm of the crankshaft, the rotation angles of the workpiece and the cutter are consistent, namely the workpiece and the cutter rotate synchronously, and only the relationship between the motion tracks of the workpiece and the cutter is found.
In the numerical control processing method of the crank arm of the medium-speed diesel engine, in the step 5), since the crank arm of the crank is composed of arc sections with different radiuses, the rotating directions of the cutters are different when the arc sections with different radiuses are processed.
The numerical control machine tool is used for processing the crank arm of the crankshaft, the relation between the tool running track and the workpiece rotating angle is found, the coordinate value of the final running track of the tool is programmed into the macro program, the macro program is operated, the arc of the crank arm of the crankshaft can be processed, the operation is simple and convenient, time and labor are saved, and the processing efficiency is high. When processing bent axle different phase turning, need not artifical adjustment frock, only need with the turning rotation of different phases to initial position, the macro procedure of direct operation can, eliminated the accumulative error that adjustment frock produced, bent axle turning machining error is little, and the machining precision is high, can improve the product percent of pass greatly. The crank arm of the crankshaft consists of arc sections with different radiuses, and the rotating directions of the cutters are different when the arc sections with different radiuses are machined.
Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view illustrating the principle of the present invention in processing crank arms.
Detailed Description
The invention is further illustrated by the following figures and examples.
In the embodiment, the crankshaft crank arm circular arc with the radius r =360mm is processed as an example, and the method is the same when the crankshaft crank arm circular arcs with the other radii are processed.
As shown in fig. 1, a numerical control processing method for a crank arm of a crankshaft of a medium-speed diesel engine comprises the following steps:
1) and adjusting the crankshaft to a turning and milling composite machining center, clamping and establishing a coordinate system. Because the rotation center of the machine tool is at the center O point of the main journal, and the arc center E point of the crankshaft crank arm 1 is offset in the X direction and the Y direction, in the machining process, a workpiece rotates around the center O point of the main journal, a cutter rotates around the arc center E point of the crankshaft crank arm 1, the rotation angles of the workpiece and the cutter are consistent, namely, the workpiece and the cutter rotate synchronously, and only the relationship of the motion tracks of the workpiece and the cutter is found.
2) And (5) calling a special milling cutter to mill the crank arm 1 of the crankshaft. Setting cutting parameters of a cutter, and offsetting the cutter in a Y direction by a distance R;
3) the cutter is operated to any initial position C point, the C point is any safe position point on the arc extension line of the crank arm of the crankshaft, the projection included angle between the connecting line of the C point and the arc center E point of the crank arm and the connecting line of the center O point and the E point of the main journal is P, the angle P is defined as the initial included angle, and the relation among the X coordinate, the Y coordinate and the rotating angle of the cutter is found through the conversion of a trigonometric function;
4) when the cutter is arranged at the point C, the value of the coordinate system X of the cutter is a line segment DC, and the value of the coordinate system Y of the cutter is a line segment BC.
X=DC=OB=AB-A0=360-162.98*cos(180-P)；
Y=BC=AE=162.98*sin(180-P)；
Subtracting the offset distance R from the value of the tool Y, and converting by a trigonometric function to obtain the following final formula:
X=162.98*cos(P)+360
Y=162.98*sin(P)-R
wherein the coefficient 162.98 is the X-direction projection distance between the arc center E point of the crank arm 1 and the center O point of the main shaft;
5) the indexing of the rotation of the tool and the rotation of the workpiece is set to be one degree, an indexing variable Q is set every time the rotation angle is increased by one degree, and the coordinate relation of the final motion track of the tool is as follows:
X=(162.98*cos((P+Q)*(-1)))+360；
Y=((162.98*sin((P+Q)*(-1))-R)
the-1 in the above formula is the rotation direction of the cutter, and because the crank arm 1 of the crankshaft is composed of arc sections with different radiuses, the rotation direction of the cutter is different when the arc sections with different radiuses are processed, and the cutter is corrected by a coefficient of-1.
6) Editing a special macro program, and taking the horizontal direction coordinate Y value and the vertical direction coordinate X value of the cutter in the step 5) as the running track of the cutter to obtain a cutter processing path;
7) and (5) operating a special macro program to process the crank arm circular arc of the crankshaft.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (3)
1. A numerical control processing method of a crank arm of a crankshaft of a medium-speed diesel engine is characterized by comprising the following steps:
1) adjusting the crankshaft to a turning and milling composite machining center, clamping and establishing a coordinate system;
2) calling a special milling cutter to mill a crank arm of the crankshaft; setting cutting parameters of a cutter, and offsetting the cutter in a Y direction by a distance R;
3) the cutter is operated to any initial position C point, the C point is any safe position point on the arc extension line of the crank arm of the crankshaft, the projection included angle between the connecting line of the C point and the arc center E point of the crank arm and the connecting line of the center O point and the E point of the main journal is P, and the angle P is defined as the initial included angle;
4) when the tool is placed at the point C, the X value and the Y value of the coordinate system of the tool are respectively as follows:
X＝162.98*cos(P)+360
Y＝162.98*sin(P)-R
wherein the coefficient 162.98 is the projection distance from the arc center of the crank arm of the crankshaft to the center X direction of the main shaft;
5) the indexing of the rotation of the tool and the rotation of the workpiece is set to be one degree, an indexing variable Q is set every time the rotation angle is increased by one degree, and the coordinate relation of the final motion track of the tool is as follows:
X＝(162.98*cos((P+Q)*(-1)))+360；
Y＝(162.98*sin((P+Q)*(-1)))-R
wherein-1 is the rotation direction of the cutter;
6) editing a special macro program, and taking the horizontal direction coordinate Y value and the vertical direction coordinate X value of the cutter in the step 5) as the running track of the cutter to obtain a cutter processing path;
7) and (5) operating a special macro program to process the crank arm circular arc of the crankshaft.
2. The numerical control machining method of the crank arm of the crankshaft of the medium-speed diesel engine as claimed in claim 1, characterized in that: in the step 1), the rotation center of the machine tool is at a point O of the center of the main journal, in the machining process, the workpiece rotates around the point O of the center of the main journal, the cutter rotates around a point E of the arc center of the crank arm of the crankshaft, the rotation angles of the workpiece and the cutter are consistent, namely the workpiece and the cutter rotate synchronously, and only the relationship between the motion tracks of the workpiece and the motion tracks of the crank arm is found.
3. The numerical control machining method of the crank arm of the crankshaft of the medium-speed diesel engine as claimed in claim 1, characterized in that: in the step 5), because the crank arm of the crankshaft is composed of arc sections with different radiuses, the rotating directions of the cutters are different when the arc sections with different radiuses are processed.
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| CN201910921787.8A CN110618654B (en) | 2019-09-27 | 2019-09-27 | Numerical control machining method for crank arm of crankshaft of medium-speed diesel engine |
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| CN201910921787.8A CN110618654B (en) | 2019-09-27 | 2019-09-27 | Numerical control machining method for crank arm of crankshaft of medium-speed diesel engine |
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| CN110618654B true CN110618654B (en) | 2021-08-27 |
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| CN112077390B (en) * | 2020-09-18 | 2021-08-17 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for eccentric groove of casing |
| CN114986251B (en) * | 2022-06-07 | 2024-01-30 | 中船动力镇江有限公司 | Method for processing connecting rod neck and crank arm of diesel engine crankshaft |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713253A (en) * | 1994-10-07 | 1998-02-03 | Toshiba Kikai Kabushiki Kaisha | Rotational machining method |
| CN101462178A (en) * | 2008-12-30 | 2009-06-24 | 武汉重工铸锻有限责任公司 | Tool and method for processing half-speed machine crankshaft |
| CN101718975A (en) * | 2009-11-20 | 2010-06-02 | 湖北汽车工业学院 | Internal milling method of fixing type crankshaft connecting rod neck |
| CN202240752U (en) * | 2011-08-31 | 2012-05-30 | 桂林福达曲轴有限公司 | Crank shaft processing and clamping device capable of detecting phase angle and flexibly indexing |
| CN107877380A (en) * | 2017-12-05 | 2018-04-06 | 中车戚墅堰机车有限公司 | A kind of crank-shaft link neck angle measurement error compensation method |
| CN109514298A (en) * | 2018-11-30 | 2019-03-26 | 安庆中船动力配套有限公司 | A kind of crankshaft-link rod clamp for machining |
-
2019
- 2019-09-27 CN CN201910921787.8A patent/CN110618654B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713253A (en) * | 1994-10-07 | 1998-02-03 | Toshiba Kikai Kabushiki Kaisha | Rotational machining method |
| CN101462178A (en) * | 2008-12-30 | 2009-06-24 | 武汉重工铸锻有限责任公司 | Tool and method for processing half-speed machine crankshaft |
| CN101718975A (en) * | 2009-11-20 | 2010-06-02 | 湖北汽车工业学院 | Internal milling method of fixing type crankshaft connecting rod neck |
| CN202240752U (en) * | 2011-08-31 | 2012-05-30 | 桂林福达曲轴有限公司 | Crank shaft processing and clamping device capable of detecting phase angle and flexibly indexing |
| CN107877380A (en) * | 2017-12-05 | 2018-04-06 | 中车戚墅堰机车有限公司 | A kind of crank-shaft link neck angle measurement error compensation method |
| CN109514298A (en) * | 2018-11-30 | 2019-03-26 | 安庆中船动力配套有限公司 | A kind of crankshaft-link rod clamp for machining |
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Address after: 212211 No. 402, Changjiang Road, Zhenjiang City, Jiangsu Province Patentee after: China Shipbuilding Power Zhenjiang Co.,Ltd. Address before: 402 Changjiang Road, Runzhou District, Zhenjiang City, Jiangsu Province Patentee before: CSSC MARINE POWER Co.,Ltd. |