CN104002109A - Method for machining deep narrow annular groove in step end face of stepped shaft - Google Patents
Method for machining deep narrow annular groove in step end face of stepped shaft Download PDFInfo
- Publication number
- CN104002109A CN104002109A CN201410266298.0A CN201410266298A CN104002109A CN 104002109 A CN104002109 A CN 104002109A CN 201410266298 A CN201410266298 A CN 201410266298A CN 104002109 A CN104002109 A CN 104002109A
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- cutter
- annular groove
- cutting knife
- cutter head
- positive cutting
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- 238000000034 method Methods 0.000 title abstract description 8
- 238000003754 machining Methods 0.000 title abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 60
- 238000007514 turning Methods 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims description 10
- 238000003672 processing method Methods 0.000 claims description 9
- 238000003801 milling Methods 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a method for machining a deep narrow annular groove in the step end face of a stepped shaft. The method includes the following steps of firstly, cutting an annular groove with a step on one side wall in the step end face of a workpiece through a forward cutter; secondly, cutting the step produced in the last step flat through a backward cutter, and then further deepening the feed and cutting an annular groove with a step on the other side face through the backward cutter; thirdly, selecting the forward cutter for use to replace the backward cutter, cutting the step produced in the last step flat through the forward cutter, and then deepening the feed and cutting an annular groove with the step on the side face opposite to the side face mentioned in the last step through the forward cutter; fourthly, sequentially repeating the second step and the third step till the depth of the annular groove reaches the design depth-design depth machining allowance, wherein the basic width of the annular grooves in the first step, the second step, the third step and the fourth step reaches the design width-design width machining allowance; fifthly, conducting finish turning; sixthly, conducting grinding. By means of the method, it is ensured that enough strength is provided for the cutters, the cutters do not interfere with the workpiece, and therefore the cutting depth is large.
Description
Technical field
The present invention relates to the processing method of the dark narrow annular groove on a kind of step end face of multidiameter.
Background technology
Hydropower industry has caused attention both domestic and external at present, water power has occupied extremely important status in energy development history, supporting the sustainable development of economic society, and in hydraulic turbine structure, the most important thing is turbine shaft, at present with regard to domestic and international turbine shaft, great majority are multidiameters, on the step end face of axle body, there is dark narrow annular groove, for equipment manufacture, this annular groove is narrow dark because of groove, is difficult to processing, utilizes the dark narrow annular groove process technical difficulty of horizontal lathe processing large, operation requirements is high, needs special equipment and technological means.Adopt traditional diamond-making technique difficulty of processing large, consuming time long, manpower, financial resources expend also larger, also do not process too deeply, be worked at most 300mm dark, in groove completion of processing pit, institute's processing step that stays is many, be difficult to guarantee the roughness requirement of groove, the difficult quality guarantee of groove.
Summary of the invention
The technical problem to be solved in the present invention is: the processing method that the dark narrow annular groove on a kind of step end face of processing the dark multidiameter of the annular groove degree of depth is provided.
In order to solve the problems of the technologies described above, the processing method of the dark narrow annular groove on the step end face of multidiameter of the present invention, comprises the steps:
(1) clamping workpiece is fixed on lathe chuck, select positive cutting knife, positive cutting knife is that upper side or downside are plane, on positive cutting knife, the side relative with described plane is step surface, positive cutting knife progressively strengthens to distance handle of a knife end upper and lower sides from cutter head, cuts out sidewall annular groove with the level with positive cutting knife on the step end face of workpiece;
(2) select anti-cutter, change positive cutting knife, the structure after the mirror image up and down of the structure of anti-cutter and positive cutting knife is identical, first with anti-cutter, cuts the step that flat previous step produces, and then anti-cutter is further deepened feeding and cut out another side annular groove with the level;
(3) select positive cutting knife, change anti-cutter, first with positive cutting knife, cut the step that flat previous step produces, then positive cutting knife is further deepened feeding and is cut out and previous step opposite sides annular groove with the level;
(4) successively repeating step (2) and (3) until the annular groove degree of depth reaches projected depth-projected depth allowance; In described step (1-4), the foundation width of annular groove is design width-design width allowance;
(5) finish turning: adopt and strengthen lathe tool, strengthen lathe tool and comprise that arc adds long-cutter holder, cutter head installing handle and cutter head, it is arc that arc adds long-cutter holder, and cutter head installing handle is bolted on the front end that arc adds long-cutter holder, and cutter head is fixed on cutter head installing handle; Cutter head stretches out extrados or the intrados that arc adds long-cutter holder, by changing cutter head towards, the whole inner surface of finish turning annular groove;
(6) polishing: milling tools is fixed on to the front end that the described arc of step (5) adds long-cutter holder, the whole inner surface of polishing annular groove.
The processing method of the dark narrow annular groove on the step end face of the another kind of multidiameter of the present invention, comprises the steps:
(1) clamping workpiece is fixed on lathe chuck, select positive cutting knife, positive cutting knife comprises handle of a knife and cutter head, cutter head is fixed on the front end of handle of a knife, the upper side of handle of a knife is concordant with cutter head upper side, the downside of handle of a knife is to take cutter head downside as the basic step surface progressively declining, and with positive cutting knife, on the step end face of workpiece, cutting out inwall is the annular groove that circular hole face outer wall is step surface;
(2) select anti-cutter, change positive cutting knife, the structure after the mirror image up and down of the structure of anti-cutter and positive cutting knife is identical, first with anti-cutter, cuts the step that flat previous step produces, and then to cut out outer wall be the annular groove that circular hole face inwall is step surface to the further feeding of anti-cutter;
(3) select positive cutting knife, change anti-cutter, first with positive cutting knife, cut the step that flat previous step produces, then to cut out inwall be the annular groove that circular hole face outer wall is step surface in the positive further feeding of cutting knife;
(4) successively repeating step (2) and (3) until the annular groove degree of depth reaches projected depth-projected depth allowance; In described step (1-4), the foundation width of annular groove is design width-design width allowance;
(5) finish turning: adopt and strengthen lathe tool, strengthen lathe tool and comprise that arc adds long-cutter holder, cutter head installing handle and cutter head, it is arc that arc adds long-cutter holder, and cutter head installing handle is bolted on the front end that arc adds long-cutter holder, and cutter head is fixed on cutter head installing handle; Cutter head stretches out extrados or the intrados that arc adds long-cutter holder, by changing cutter head towards, the whole inner surface of finish turning annular groove;
(6) polishing: milling tools is fixed on to the front end that the described arc of step (5) adds long-cutter holder, the whole inner surface of polishing annular groove.
In order to obtain good processing effect, described annular groove projected depth is 400-500mm, projected depth allowance 8-12mm, design width is 60-70mm, the monolateral allowance of design width is 2-4mm, long 750mm, wide 35mm and the high 80mm of positive cutting knife, the thickness that arc adds long-cutter holder is that 25mm, length are 650mm and height 280mm, the cutter head of strengthening lathe tool is long 115mm, wide 36mm and high 36mm.
The invention has the beneficial effects as follows: the present invention is by adopting positive anti-cutter to replace progressively car fraising, and the special structure due to positive anti-cutter, had both guaranteed, for cutting knife has enough intensity, not interfere with workpiece again, thereby make depth of cut dark.When fine finishining, handle of a knife adopts special structure, makes the cross section of handle of a knife enough large, has enough intensity, does not interfere with workpiece again.Thereby make fine finishining not stay dead angle.Thereby guarantee the darker deep hole annular groove of processing.Process velocity is fast, and working (machining) efficiency is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the positive cutting knife that uses of the present invention;
Fig. 2 is the structural representation of the anti-cutter that uses of the present invention;
Fig. 3 is the structural representation of the reinforcement lathe tool that uses of the present invention;
Fig. 4 is the right view of part 3 in Fig. 3;
Fig. 5 be in Fig. 3 A to local diagram;
Fig. 6-Figure 10 is the machining sketch chart that the present invention uses a plurality of work steps of positive cutting knife or anti-cutter;
Figure 11 is that the present invention uses the machining sketch chart of strengthening lathe tool;
Figure 12 is the workpiece figure of moulding of the present invention;
In figure: 1, cutter head, 2, handle of a knife, 3, arc adds long-cutter holder, 4, hole for hoist, 5, bolt, 6, cutter head installing handle, 7, cutter head, 8, lathe chuck, 9, workpiece, 10, annular groove, 11, step end face, 12, positive cutting knife, 13, anti-cutter, 14, strengthen lathe tool.
The specific embodiment
The processing method of the dark narrow annular groove on the step end face of a kind of multidiameter as shown in Fig. 6-12, comprises the steps:
(1) workpiece 9 clampings are fixed on lathe chuck 8, select positive cutting knife 12, as shown in Figure 1, positive cutting knife 12 comprises handle of a knife 2 and cutter head 1, cutter head 1 is fixed on the front end of handle of a knife 2, the upper side of handle of a knife 2 is concordant with cutter head 1 upper side, and the downside of handle of a knife 2 is to take cutter head 1 downside as the basic step surface progressively declining.As shown in Figure 6, with positive cutting knife 12, on the step end face 11 of workpiece 9, cutting out inwall is the annular groove 10 that circular hole face outer wall is step surface.
(2) select anti-cutter 13, change positive cutting knife 12, as shown in Figure 2, structure after the mirror image up and down of the structure of anti-cutter 13 and positive cutting knife 12 is identical, as shown in Figure 7, first with anti-cutter 13, cut the step that flat previous step produces, as shown in Figure 8, then to cut out outer wall be the annular groove 10 that circular hole face inwall is step surface to the further feeding of anti-cutter.
(3) as shown in Figure 9, select positive cutting knife 12, change anti-cutter 13, first with positive cutting knife 12, cut the step that flat previous step produces, as shown in figure 10, then to cut out inwall be the annular groove 10 that circular hole face outer wall is step surface in the positive further feeding of cutting knife 12.
(4) successively repeating step (2) and (3) until annular groove 10 degree of depth reach projected depth-projected depth allowance; In described step (1-4), the foundation width of annular groove 10 is design width-design width allowance; Foundation width refers to the width except the straight trough with step part.
(5) finish turning: adopt and strengthen lathe tool 14, as shown in Fig. 3, Fig. 4 and Fig. 5, strengthen lathe tool 14 and comprise that arc adds long-cutter holder 3, cutter head installing handle 6 and cutter head 7, arc adds long-cutter holder 3 for arc, cutter head installing handle 6 is fixed on by bolt 5 front end that arc adds long-cutter holder 3, and cutter head 7 is fixed on cutter head installing handle 6; Cutter head 7 stretches out extrados or the intrados that arc adds long-cutter holder 3, by changing cutter head 7 towards, the whole inner surface (as shown in figure 11) of finish turning annular groove 10; For convenient lifting, arc adds and on long-cutter holder 3, is designed with hole for hoist 4.
(6) polishing: milling tools is fixed on to the front end that the described arc of step (5) adds long-cutter holder 3, the whole inner surface of polishing annular groove 10, moulding workpiece as shown in figure 12.By milling tools, can be on the birch that tightly wraps up of sand paper.
Annular groove 10 projected depths are 400-500mm, projected depth allowance 8-12mm, design width is 60-70mm, the monolateral allowance of design width is 2-4mm, long 750mm, wide 35mm and the high 80mm of positive cutting knife, the thickness that arc adds long-cutter holder is that 25mm, length are 650mm and height 280mm, and the cutter head of strengthening lathe tool is long 115mm, wide 36mm and high 36mm.The present invention is not limited to the concrete data of this section.
Claims (3)
1. a processing method for the dark narrow annular groove on the step end face of multidiameter, is characterized in that: comprise the steps:
(1) clamping workpiece is fixed on lathe chuck, select positive cutting knife, positive cutting knife is that upper side or downside are plane, on positive cutting knife, the side relative with described plane is step surface, positive cutting knife progressively strengthens to distance handle of a knife end upper and lower sides from cutter head, cuts out sidewall annular groove with the level with positive cutting knife on the step end face of workpiece;
(2) select anti-cutter, change positive cutting knife, the structure after the mirror image up and down of the structure of anti-cutter and positive cutting knife is identical, first with anti-cutter, cuts the step that flat previous step produces, and then anti-cutter is further deepened feeding and cut out another side annular groove with the level;
(3) select positive cutting knife, change anti-cutter, first with positive cutting knife, cut the step that flat previous step produces, then positive cutting knife is further deepened feeding and is cut out and previous step opposite sides annular groove with the level;
(4) successively repeating step (2) and (3) until the annular groove degree of depth reaches projected depth-projected depth allowance; In described step (1-4), the foundation width of annular groove is design width-design width allowance;
(5) finish turning: adopt and strengthen lathe tool, strengthen lathe tool and comprise that arc adds long-cutter holder, cutter head installing handle and cutter head, it is arc that arc adds long-cutter holder, and cutter head installing handle is bolted on the front end that arc adds long-cutter holder, and cutter head is fixed on cutter head installing handle; Cutter head stretches out extrados or the intrados that arc adds long-cutter holder, by changing cutter head towards, the whole inner surface of finish turning annular groove;
(6) polishing: milling tools is fixed on to the front end that the described arc of step (5) adds long-cutter holder, the whole inner surface of polishing annular groove.
2. a processing method for the dark narrow annular groove on the step end face of multidiameter, is characterized in that: comprise the steps:
(1) clamping workpiece is fixed on lathe chuck, select positive cutting knife, positive cutting knife comprises handle of a knife and cutter head, cutter head is fixed on the front end of handle of a knife, the upper side of handle of a knife is concordant with cutter head upper side, the downside of handle of a knife is to take cutter head downside as the basic step surface progressively declining, and with positive cutting knife, on the step end face of workpiece, cutting out inwall is the annular groove that circular hole face outer wall is step surface;
(2) select anti-cutter, change positive cutting knife, the structure after the mirror image up and down of the structure of anti-cutter and positive cutting knife is identical, first with anti-cutter, cuts the step that flat previous step produces, and then to cut out outer wall be the annular groove that circular hole face inwall is step surface to the further feeding of anti-cutter;
(3) select positive cutting knife, change anti-cutter, first with positive cutting knife, cut the step that flat previous step produces, then to cut out inwall be the annular groove that circular hole face outer wall is step surface in the positive further feeding of cutting knife;
(4) successively repeating step (2) and (3) until the annular groove degree of depth reaches projected depth-projected depth allowance; In described step (1-4), the foundation width of annular groove is design width-design width allowance;
(5) finish turning: adopt and strengthen lathe tool, strengthen lathe tool and comprise that arc adds long-cutter holder, cutter head installing handle and cutter head, it is arc that arc adds long-cutter holder, and cutter head installing handle is bolted on the front end that arc adds long-cutter holder, and cutter head is fixed on cutter head installing handle; Cutter head stretches out extrados or the intrados that arc adds long-cutter holder, by changing cutter head towards, the whole inner surface of finish turning annular groove;
(6) polishing: milling tools is fixed on to the front end that the described arc of step (5) adds long-cutter holder, the whole inner surface of polishing annular groove.
3. processing method according to claim 2, it is characterized in that: described annular groove projected depth is 400-500mm, projected depth allowance 8-12mm, design width is 60-70mm, the monolateral allowance of design width is 2-4mm, long 750mm, wide 35mm and the high 80mm of positive cutting knife, the thickness that arc adds long-cutter holder is that 25mm, length are 650mm and height 280mm, the cutter head of strengthening lathe tool is long 115mm, wide 36mm and high 36mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266298.0A CN104002109B (en) | 2014-06-16 | 2014-06-16 | The processing method of the dark narrow annular groove on a kind of step end face of multidiameter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266298.0A CN104002109B (en) | 2014-06-16 | 2014-06-16 | The processing method of the dark narrow annular groove on a kind of step end face of multidiameter |
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| Publication Number | Publication Date |
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| CN104002109A true CN104002109A (en) | 2014-08-27 |
| CN104002109B CN104002109B (en) | 2016-04-20 |
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| CN201410266298.0A Active CN104002109B (en) | 2014-06-16 | 2014-06-16 | The processing method of the dark narrow annular groove on a kind of step end face of multidiameter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105479099A (en) * | 2015-12-23 | 2016-04-13 | 常熟市淼泉压缩机配件有限公司 | Improved technology for machining deep groove parts by numerically-controlled lathe |
| CN112008100A (en) * | 2020-08-29 | 2020-12-01 | 中国航发南方工业有限公司 | Annular end face groove machining tool |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1792680A2 (en) * | 2005-12-01 | 2007-06-06 | General Electric Company | Method for machining components of turbine engines |
| CN101537509A (en) * | 2008-03-19 | 2009-09-23 | 中煤张家口煤矿机械有限责任公司 | Method and tool for machining step deep holes |
| CN201693221U (en) * | 2010-04-15 | 2011-01-05 | 吉林大学 | Depth-adjustable counterboring tool |
| CN103464967A (en) * | 2013-09-10 | 2013-12-25 | 崔严 | Method for manufacturing deep hole |
-
2014
- 2014-06-16 CN CN201410266298.0A patent/CN104002109B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1792680A2 (en) * | 2005-12-01 | 2007-06-06 | General Electric Company | Method for machining components of turbine engines |
| CN101537509A (en) * | 2008-03-19 | 2009-09-23 | 中煤张家口煤矿机械有限责任公司 | Method and tool for machining step deep holes |
| CN201693221U (en) * | 2010-04-15 | 2011-01-05 | 吉林大学 | Depth-adjustable counterboring tool |
| CN103464967A (en) * | 2013-09-10 | 2013-12-25 | 崔严 | Method for manufacturing deep hole |
Non-Patent Citations (2)
| Title |
|---|
| 周宪文: "水轮机主轴轴肩槽加工刀具改进", 《装备制造技术》 * |
| 姜国华，陈杰凤: "水轮机主轴轴肩槽加工工艺性分析", 《大电机技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105479099A (en) * | 2015-12-23 | 2016-04-13 | 常熟市淼泉压缩机配件有限公司 | Improved technology for machining deep groove parts by numerically-controlled lathe |
| CN112008100A (en) * | 2020-08-29 | 2020-12-01 | 中国航发南方工业有限公司 | Annular end face groove machining tool |
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| Publication number | Publication date |
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| CN104002109B (en) | 2016-04-20 |
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Denomination of invention: Method for machining deep narrow annular groove in step end face of stepped shaft Effective date of registration: 20190227 Granted publication date: 20160420 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: 2019990000162 |
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Date of cancellation: 20210304 Granted publication date: 20160420 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: 2019990000162 |
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Denomination of invention: A processing method of deep narrow ring groove on step end face of step shaft Effective date of registration: 20210304 Granted publication date: 20160420 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2021990000216 |
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Date of cancellation: 20230320 Granted publication date: 20160420 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2021990000216 |
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Denomination of invention: A machining method for deep and narrow ring grooves on the step end face of a stepped shaft Effective date of registration: 20230323 Granted publication date: 20160420 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2023980035948 |
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