CN114952212A - Method for machining connecting rod waist-shaped hole of marine diesel engine - Google Patents
Method for machining connecting rod waist-shaped hole of marine diesel engine Download PDFInfo
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- CN114952212A CN114952212A CN202210795433.5A CN202210795433A CN114952212A CN 114952212 A CN114952212 A CN 114952212A CN 202210795433 A CN202210795433 A CN 202210795433A CN 114952212 A CN114952212 A CN 114952212A
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- 238000003754 machining Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003801 milling Methods 0.000 claims abstract description 19
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 6
- 235000005822 corn Nutrition 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000003672 processing method Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 241000209149 Zea Species 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 5
- 240000008042 Zea mays Species 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- B23P17/00—Metal-working operations, not covered by a single other subclass or another group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
- Drilling And Boring (AREA)
Abstract
A method for processing a waist-shaped hole of a connecting rod of a marine diesel engine comprises the following steps: 1) horizontally placing the connecting rod on the table top of a workbench of the numerical control horizontal planer type milling machine; 2) removing the allowance of the central area of the waist-shaped hole by using a drill, wherein the drilling depth is half of the thickness of the waist-shaped hole; 3) roughly machining the outline of the waist-shaped hole by using a fast-feeding cutter head, reserving a margin of 1mm on a single side, and machining the waist-shaped hole to a total depth which is half of the thickness of the waist-shaped hole; 4) semi-finishing the outline of the waist-shaped hole by using a corn milling cutter, reserving a margin of 0.2mm on a single side, and processing the outline to a depth which is half of the thickness of the waist-shaped hole; 5) finish machining the outline of the waist-shaped hole by using an end mill, and finishing full-outline machining by continuous feed without leaving tool connecting marks; 6) turning the connecting rod up and down by 180 degrees, and repeating the steps 2) -5) to process the other half of the thickness of the waist-shaped hole; 7) and removing a tool connecting mark in the middle of the waist-shaped hole by using an arc milling cutter. The invention completes the processing of the upper waist-shaped hole of the connecting rod of the dual-fuel diesel engine, meets the technical requirements and ensures the processing quality.
Description
Technical Field
The invention relates to a machining process of parts of a marine diesel engine, in particular to a machining method of a connecting rod waist-shaped hole of the marine diesel engine, and belongs to the technical field of machining.
Background
Under the policy background of implementing carbon neutralization, a large-scale marine diesel engine is comprehensively upgraded into a dual-fuel system so as to achieve the purposes of energy conservation and emission reduction, so that the power of the marine diesel engine is increased on the basis of keeping the original cylinder number, and the strength of a connecting rod is correspondingly increased. The shaft body of the connecting rod of the marine dual-fuel diesel engine is thicker than that of a common connecting rod, and referring to fig. 1, two waist-shaped holes 01 are formed in the middle of the shaft body 02 of the connecting rod of the marine diesel engine to reduce the weight of the connecting rod and remove stress. Referring to fig. 2, the kidney-shaped hole 01 is a complex kidney-shaped hole symmetrical about the X-axis and symmetrical about the Y-axis, and is formed by smoothly connecting two short straight line segments 1, four small arcs 2, four large arcs 3, and two long straight line segments 4. The kidney-shaped hole 01 is a complex kidney-shaped hole penetrating through the shaft body 02 and has a thick thickness, so that the processing is difficult and the technical quality requirement is not easy to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for processing a connecting rod kidney-shaped hole of a marine diesel engine, so that the problem of difficulty in processing a thick complex through hole is solved, and the processing quality of the connecting rod kidney-shaped hole is ensured to meet the requirement of drawing tolerance.
The technical scheme of the invention is as follows:
a marine diesel connecting rod kidney-shaped hole processing method, the kidney-shaped hole is a symmetrical complex kidney-shaped hole which runs through the body of the connecting rod and has thicker thickness, the outline of the kidney-shaped hole is formed by smoothly connecting two short straight line sections, four small circular arcs, four large circular arcs and two long straight line sections; the method is characterized in that: the processing method comprises the following specific steps:
1) horizontally placing the connecting rod on the table top of a workbench of the numerical control horizontal planer type milling machine;
2) removing the allowance of the central area of the waist-shaped hole by using a drill, wherein the drilling depth is half of the thickness of the waist-shaped hole;
3) roughly machining the outline of the waist-shaped hole by using a fast-feeding cutter head, reserving a margin of 1mm on a single side, and machining the waist-shaped hole to a total depth which is half of the thickness of the waist-shaped hole;
4) semi-finishing the outline of the waist-shaped hole by using a corn milling cutter, reserving a margin of 0.2mm on a single side, and processing the outline to a depth which is half of the thickness of the waist-shaped hole;
5) finish machining the outline of the waist-shaped hole by using an end mill, and finishing full-outline machining by continuous feed without leaving tool connecting marks;
6) turning the connecting rod up and down by 180 degrees, and repeating the steps 2) -5) to process the other half of the thickness of the waist-shaped hole;
7) and removing a tool connecting mark in the middle of the waist-shaped hole by using an arc milling cutter.
Further, in the step 3), a spiral milling mode is adopted to process layer by layer, and 1mm of allowance is removed from each layer.
Further, in the step 5), the effective cutting length of the end mill is half of the thickness of the kidney-shaped hole.
Further, the end mill is a high-strength solid carbide end mill.
Furthermore, the radiuses of the drill bit, the fast feed cutter head, the corn milling cutter and the end milling cutter are all smaller than the radius of the small circular arc of the kidney-shaped hole.
Compared with the prior art, the invention has the following beneficial effects:
the invention conveniently completes the processing of the waist-shaped hole on the connecting rod of the dual-fuel diesel engine, meets the technical requirements and ensures the processing quality of the waist-shaped hole.
Drawings
Fig. 1 is a schematic diagram of a dual fuel marine low speed diesel engine connecting rod.
Fig. 2 is a schematic view of a kidney hole.
FIG. 3 is a process flow diagram of the present invention.
Wherein, 01-waist type hole, 02-pole body, 1-short straight line segment, 2-small circular arc, 3-big circular arc, 4-long straight line segment.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the scope of the invention as claimed should not be limited thereby.
The invention is used for processing the waist-shaped hole on the connecting rod of the marine diesel engine, the waist-shaped hole is a symmetrical complex waist-shaped hole which runs through the rod body of the connecting rod, has thicker thickness, and the appearance is formed by smoothly connecting two short straight line sections, four small circular arcs, four large circular arcs and two long straight line sections.
Referring to fig. 3, the method for processing the connecting rod kidney-shaped hole of the marine diesel engine according to the present invention includes the following steps:
1) horizontally placing the connecting rod on the table top of a workbench of the numerical control horizontal planer type milling machine;
2) removing the allowance of the middle part of the waist-shaped hole by using a drill bit with the radius smaller than the small circular arc of the waist-shaped hole, wherein the drilling depth is half of the thickness of the waist-shaped hole;
3) roughly machining the outline of the kidney-shaped hole by using a fast-forward cutter head with the radius smaller than the small arc of the kidney-shaped hole, reserving a margin with a single side of 1mm, and machining layer by adopting a spiral milling mode, wherein 1mm is removed from each layer, and the total machining depth is half of the thickness of the kidney-shaped hole;
4) semi-finishing the contour of the waist-shaped hole by using a corn milling cutter with the radius smaller than the small arc of the waist-shaped hole, reserving a margin of 0.2mm on a single side, and processing the contour to a depth which is half of the thickness of the waist-shaped hole;
5) finish machining is carried out by using an end mill with the radius smaller than the small arc of the waist-shaped hole, and as the roughness of the hole wall requires Ra1.6, the effective cutting length of the end mill is required to be half of the thickness of the waist-shaped hole, so that the whole-profile integral machining is finished by continuous feeding without leaving tool marks, and the end mill needs to use a high-strength integral hard alloy end mill;
6) turning the connecting rod up and down by 180 degrees, and repeating the steps 2) -5) to process the other half of the thickness of the waist-shaped hole;
7) because the waist-shaped hole is respectively processed by half of the thickness twice, a tool connecting mark is left in the middle, and the tool connecting mark is removed by using an arc milling cutter.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made within the scope of the present invention should be considered to be within the technical scope of the present invention.
Claims (5)
1. A marine diesel connecting rod kidney-shaped hole processing method, the kidney-shaped hole is a symmetrical complex kidney-shaped hole which runs through the body of the connecting rod and has thicker thickness, the outline of the kidney-shaped hole is formed by smoothly connecting two short straight line sections, four small circular arcs, four large circular arcs and two long straight line sections; the method is characterized in that: the processing method comprises the following specific steps:
1) horizontally placing the connecting rod on the table top of a workbench of the numerical control horizontal planer type milling machine;
2) removing the allowance of the central area of the waist-shaped hole by using a drill, wherein the drilling depth is half of the thickness of the waist-shaped hole;
3) roughly machining the outline of the waist-shaped hole by using a fast-feeding cutter head, reserving a margin of 1mm on a single side, and machining the waist-shaped hole to a total depth which is half of the thickness of the waist-shaped hole;
4) semi-finishing the outline of the waist-shaped hole by using a corn milling cutter, reserving a margin of 0.2mm on a single side, and processing the outline to a depth which is half of the thickness of the waist-shaped hole;
5) finish machining the outline of the waist-shaped hole by using an end mill, and finishing full-outline machining by continuous feed without leaving tool connecting marks;
6) turning the connecting rod up and down by 180 degrees, and repeating the steps 2) -5) to process the other half of the thickness of the waist-shaped hole;
7) and removing a tool connecting mark in the middle of the waist-shaped hole by using an arc milling cutter.
2. The method for processing the marine diesel engine connecting rod kidney-shaped hole according to claim 1, characterized in that: and 3), machining layer by adopting a spiral milling mode, and removing 1mm of allowance in each layer.
3. The method for processing the connecting rod kidney-shaped hole of the marine diesel engine according to claim 1, characterized in that: in the step 5), the effective cutting length of the end mill is half of the thickness of the kidney-shaped hole.
4. The method for processing the marine diesel engine connecting rod kidney-shaped hole according to claim 1 or 3, characterized in that: the end mill is a high-strength integral hard alloy end mill.
5. The method for processing the connecting rod kidney-shaped hole of the marine diesel engine according to claim 1, characterized in that: the radiuses of the drill bit, the fast feed cutter head, the corn milling cutter and the end milling cutter are all smaller than the radius of the small arc of the kidney-shaped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795433.5A CN114952212A (en) | 2022-07-06 | 2022-07-06 | Method for machining connecting rod waist-shaped hole of marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795433.5A CN114952212A (en) | 2022-07-06 | 2022-07-06 | Method for machining connecting rod waist-shaped hole of marine diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN114952212A true CN114952212A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210795433.5A Pending CN114952212A (en) | 2022-07-06 | 2022-07-06 | Method for machining connecting rod waist-shaped hole of marine diesel engine |
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| CN (1) | CN114952212A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8256092B1 (en) * | 2008-01-30 | 2012-09-04 | Makino Inc. | Method for helical boring |
| CN103084809A (en) * | 2013-02-28 | 2013-05-08 | 重庆望江工业有限公司 | Machining method for triquetrum hole |
| CN103551627A (en) * | 2013-11-06 | 2014-02-05 | 苏州工业园区得意机电设备有限公司 | Deep hole machining method for numerical control machine tool gantry pentahedron |
| CN103600210A (en) * | 2013-11-29 | 2014-02-26 | 陈禄 | Slotted hole processing method |
| CN104384824A (en) * | 2014-10-16 | 2015-03-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Processing methods of High temperature alloy GH4169 special-shaped hole and hole edge fillet |
| CN105215436A (en) * | 2015-09-17 | 2016-01-06 | 东方电气(广州)重型机器有限公司 | A kind of brill milling compound tool of deep hole machining and the method using it to process |
| CN114054815A (en) * | 2022-01-18 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | High-precision special-shaped hole machining method |
-
2022
- 2022-07-06 CN CN202210795433.5A patent/CN114952212A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8256092B1 (en) * | 2008-01-30 | 2012-09-04 | Makino Inc. | Method for helical boring |
| CN103084809A (en) * | 2013-02-28 | 2013-05-08 | 重庆望江工业有限公司 | Machining method for triquetrum hole |
| CN103551627A (en) * | 2013-11-06 | 2014-02-05 | 苏州工业园区得意机电设备有限公司 | Deep hole machining method for numerical control machine tool gantry pentahedron |
| CN103600210A (en) * | 2013-11-29 | 2014-02-26 | 陈禄 | Slotted hole processing method |
| CN104384824A (en) * | 2014-10-16 | 2015-03-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Processing methods of High temperature alloy GH4169 special-shaped hole and hole edge fillet |
| CN105215436A (en) * | 2015-09-17 | 2016-01-06 | 东方电气(广州)重型机器有限公司 | A kind of brill milling compound tool of deep hole machining and the method using it to process |
| CN114054815A (en) * | 2022-01-18 | 2022-02-18 | 成都飞机工业（集团）有限责任公司 | High-precision special-shaped hole machining method |
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Application publication date: 20220830 |