CN103182622A - Rough machining method for cylinder casting of steam turbine - Google Patents
Rough machining method for cylinder casting of steam turbine Download PDFInfo
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- CN103182622A CN103182622A CN2011104459713A CN201110445971A CN103182622A CN 103182622 A CN103182622 A CN 103182622A CN 2011104459713 A CN2011104459713 A CN 2011104459713A CN 201110445971 A CN201110445971 A CN 201110445971A CN 103182622 A CN103182622 A CN 103182622A
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Abstract
The invention discloses a rough machining method for a cylinder casting of a steam turbine. The rough machining method is used for machining the cylinder of the steam turbine, wherein the cylinder has a length of not less than 4,000mm, a diameter of not less than 2,000mm and a radius of not less than 1,000mm. The rough machining method comprises the steps: 1, scribing; 2, rough milling; 3, gantry milling; 4, rough boring of an abdominal cavity; and 5, rough boring of an outer circle, wherein the fourth step comprises the following procedures: 1, clamping and positioning a workpiece by using a clamping and positioning tool; and 2, roughly milling each step surface in the abdominal cavity by using a rough boring tool according to a precision machining reference. By adopting the method, an ordinary machine tool can be used for finishing the rough machining of the cylinder casting of the steam turbine instead of numerical control equipment. The method can be used for the batch production of cylinder castings of the steam turbine. The use of a rare numerical control machine is avoided, energy loss can be reduced, and the machining cost can be reduced.
Description
Technical field
The present invention relates to a kind of rough machining method of heavy casting and forging, be specifically related to a kind of rough machining method of steam turbine cylinder foundry goods.
Background technology
Heavy casting and forging is that national major technologies and equipment and Important Project are built necessary important foundation part, and the manufacturing capacity of heavy casting and forging and manufacture level are directly determining the manufacturing ability of national major technologies and equipment and level.
Along with the rapid growth of power demand, also more and more higher to the requirement of generating equipment ability, gigawatt and above large-scale generating equipment are built just gradually and are put into effect.The large-sized civil cylinder block casting is mainly used in the critical component of generating equipment---steam turbine part, its critical piece comprise on the high pressure outer shell second, on the high pressure outer shell admission end, middle pressure inner casing second.Wherein, the medium-sized employing is low alloy steel castings more about the high pressure outer shell; High pressure outer shell admission end and middle pressure inner casing medium-sized employing the up and down are stainless cast steel parts more.
Typical split formula steam turbine cylinder (being that cylinder body is formed a complete circular cylinder body by two lobes of symmetry) as shown in Figure 1, cylinder interior exists a plurality of step surfaces that need processing, the abdominal cavity complex structure of cylinder body.
There is following problem in the processing of steam turbine cylinder:
1, the tonnage of steam turbine cylinder is bigger, and generally more than 30 tons, the size of length is generally at 3000mm * 1500mm * more than the 1500mm, must process at large-scale planer-type milling machine or boring machine;
2, steam turbine cylinder is made up of last second, the cavity structure complexity in the cylinder body, and the horizontal flange of cylinder body has the allowance of 3～5mm, and therefore, steam turbine cylinder can not make up processing;
3, there are a lot of admission, venthole cylindricals not of uniform size in the outside of steam turbine cylinder, and welding lug cylindrical, therefore, Digit Control Machine Tool be can only adopt, Intraabdominal cascaded surface and cylindrical processed at planer-type milling machine with metal saw or face and side cutter by numerical control programming.
But steam turbine cylinder is only required roughing delivery, adopts Digit Control Machine Tool processing will inevitably increase production cost, and human and material resources can drop into very big, can't be used in enormous quantities the manufacturing.
Summary of the invention
Technical problem to be solved by this invention provides a kind of rough machining method of steam turbine cylinder foundry goods, and it can finish the roughing of steam turbine cylinder foundry goods at machine tool.
For solving the problems of the technologies described above, the technical solution of the rough machining method of steam turbine cylinder foundry goods of the present invention is:
Being used for the processing overall dimensions is that length is not less than 4000mm, and diameter is not less than 2000mm, and radius is not less than the steam turbine cylinder of 1000mm, may further comprise the steps:
The first step, line;
In second step, rough mill;
Stay 2～3mm surplus, mill horizontal flange, as the fine finishining benchmark;
In the 3rd step, mill at gantry;
Adopt planer-type milling machine, according to the fine finishining benchmark, the end face of each air admission hole of finish-milling, the finish-milling horizontal flange mills out two stomidiums at the cylinder body two ends, makes size reach the drawing requirement;
The tolerance control that mill at described gantry is in 0.1mm, and surface roughness reaches Ra3.2.
The 4th step, the heavy boring abdominal cavity;
Operation one, employing clamping positioning tool are located clamping workpiece;
Described clamping positioning tool comprises support set frock and supporting seat frock;
The support set frock comprises half-turn, lower branch, and last half-turn, lower branch are formed an annular frock, and the external diameter of the annular frock that upper and lower half-turn is formed matches with the stomidium internal diameter at workpiece two ends;
The supporting seat frock comprises base, arc bracing frame, and the arc bracing frame is realized supporting by base; The internal diameter of arc bracing frame matches with the external diameter of annular frock.
The method of clamping workpiece location is:
Make the abdominal cavity of workpiece downward, in the stomidium at workpiece two ends, place a support set frock respectively, the stomidium of workpiece is contacted with the last half-turn of support set frock;
The support set frock is positioned in the supporting seat frock, the lower branch of support set frock is contacted with the arc bracing frame of supporting seat frock;
Clamping is realized by a cover support set and supporting seat frock respectively in the two ends of workpiece;
Operation two, according to the fine finishining benchmark, adopt the heavy boring cutter to rough mill Intraabdominal each step surface;
The 5th step, the heavy boring cylindrical;
Adopt cylindrical heavy boring cutter, cylindrical heavy boring cutter is installed on the boring machine periphery of each air inlet of heavy boring workpiece.
Described cylindrical heavy boring cutter comprises cylindrical heavy boring blade row, cylindrical shoulder pole boring row, transition boring cutter row;
Cylindrical heavy boring blade row comprises the boring cutter fixed mount, and an end of boring cutter fixed mount is stiff end, and the other end is link; The stiff end of boring cutter fixed mount connects the heavy boring cutter, and the link of boring cutter fixed mount is connected with cylindrical shoulder pole boring row;
Cylindrical shoulder pole boring row is provided with link slot, and the length of link slot is greater than the length of the link of boring cutter fixed mount; Cylindrical heavy boring blade row is connected with cylindrical shoulder pole boring row by link; Cylindrical heavy boring blade row can be along the length direction of link slot, with respect to cylindrical shoulder pole boring row translation; The boring of cylindrical shoulder pole row be fixedly set on the transition boring cutter row;
The transition boring cutter row is provided with the holddown groove that matches with cylindrical shoulder pole boring row, and the boring of cylindrical shoulder pole row be fixedly set in the holddown groove of transition boring cutter row.
The technique effect that the present invention can reach is:
The present invention can realize replacing numerical control device with machine tool, finishes the roughing of steam turbine cylinder foundry goods.
The present invention can realize the mass production of steam turbine cylinder foundry goods.
The present invention need not to use rare Digit Control Machine Tool, can reduce energy loss, reduces processing cost.
The present invention can reduce each part in the time that lathe stops, and shortens man-hour greatly, boosts productivity nearly 10 times.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation of typical split formula steam turbine cylinder;
Fig. 2 is the structural representation of support set frock of the present invention;
Fig. 3 is the structural representation of supporting seat frock of the present invention;
Fig. 4 is the structural representation of cylindrical heavy boring blade row of the present invention;
Fig. 5 is cylindrical shoulder pole boring row's of the present invention structural representation;
Fig. 6 is the structural representation of transition boring cutter row of the present invention.
Description of reference numerals among the figure:
1 is last half-turn, and 2 is connecting bolt,
3 is lower branch, and 11 is base,
12 is bracing frame, and 21 is the boring cutter fixed mount,
22 is link, and 23 is stiff end,
31 is link slot, and 41 is holddown groove.
The specific embodiment
The rough machining method of steam turbine cylinder foundry goods of the present invention is used for processing steam turbine cylinder as shown in Figure 1, and the overall dimensions of steam turbine cylinder are that length is not less than 4000mm, and diameter is not less than 2000mm, and radius is not less than 1000mm; May further comprise the steps:
The first step, line;
Mark the position of center line on all processing diameters and plane at workpiece, mark the horizontal flange line, as the roughing benchmark;
In second step, rough mill;
Stay 2～3mm surplus, mill horizontal flange, as the fine finishining benchmark;
In the 3rd step, mill at gantry;
Adopt planer-type milling machine, according to the fine finishining benchmark, the end face of each air admission hole of finish-milling, the finish-milling horizontal flange, mill out two stomidiums (stomidium is semicircle orifice) at the cylinder body two ends with metal saw or face and side cutter, make size reach the drawing requirement, tolerance is controlled in 0.1mm, and surface roughness reaches Ra3.2;
The 4th step, the heavy boring abdominal cavity;
Operation one, employing clamping positioning tool are located clamping workpiece;
The clamping positioning tool comprise as shown in Figure 2 the support set frock and supporting seat frock as shown in Figure 3;
The support set frock comprises half-turn 1, lower branch 3, and last half-turn 1, lower branch 3 are formed an annular frock, and last half-turn 1 is realized being connected by connecting bolt 2 with lower branch 3;
The external diameter of upper and lower half-turn 1, the 3 annular frocks of forming matches with the stomidium internal diameter at workpiece two ends;
The supporting seat frock comprises base 11, arc bracing frame 12, and arc bracing frame 12 is realized supporting by base 11; The internal diameter of arc bracing frame 12 matches with the external diameter of annular frock;
The method of clamping workpiece location is:
Make the abdominal cavity of workpiece downward, in the stomidium at workpiece two ends, place a support set frock respectively, the stomidium of workpiece is contacted with the last half-turn 1 of support set frock;
The support set frock is positioned in the supporting seat frock, the lower branch 3 of support set frock is contacted with the arc bracing frame 12 of supporting seat frock;
Clamping is realized by a cover support set and supporting seat frock respectively in the two ends of workpiece;
Operation two, according to the fine finishining benchmark, adopt the heavy boring cutter to rough mill Intraabdominal each step surface;
Clamping positioning tool of the present invention can shorten time of workpiece positioning and clamping greatly.
The 5th step, the heavy boring cylindrical;
Adopt cylindrical heavy boring cutter, the periphery of each air inlet of heavy boring workpiece;
Cylindrical heavy boring cutter comprises cylindrical heavy boring blade row, cylindrical shoulder pole boring row, transition boring cutter row;
As shown in Figure 4, cylindrical heavy boring blade row comprises boring cutter fixed mount 21, and an end of boring cutter fixed mount 21 is stiff end 23, and the other end is link 22; The stiff end 23 of boring cutter fixed mount 21 connects the heavy boring cutter; The link 22 of boring cutter fixed mount 21 is connected with cylindrical shoulder pole boring row;
As shown in Figure 5, cylindrical shoulder pole boring row is provided with link slot 31, and the length of link slot 31 is greater than the length of the link 22 of boring cutter fixed mount 21; Cylindrical heavy boring blade row is connected with cylindrical shoulder pole boring row by link 22; Cylindrical heavy boring blade row can be along the length direction of link slot 31, with respect to cylindrical shoulder pole boring row translation; The boring of cylindrical shoulder pole row be fixedly set on the transition boring cutter row;
As shown in Figure 6, the transition boring cutter row is provided with the holddown groove 41 that matches with cylindrical shoulder pole boring row, and the boring of cylindrical shoulder pole row be fixedly set in the holddown groove 41 of transition boring cutter row;
Cylindrical heavy boring cutter is installed on the boring machine of prior art, and the cylindrical of machining hole and boss reaches the drawing requirement.
Cylindrical heavy boring blade row of the present invention can make the heavy boring cutter that is connected with cylindrical heavy boring blade row with respect to cylindrical shoulder pole boring row translation, thereby regulate according to the size of cylindrical with respect to cylindrical shoulder pole boring row translation, realizes utilizing common boring machine processing excircles.
The present invention adopts cylindrical heavy boring cutter, solved the problem that machine tool can not processing excircles.
Claims (4)
1. the rough machining method of a steam turbine cylinder foundry goods is characterized in that, being used for the processing overall dimensions is that length is not less than 4000mm, and diameter is not less than 2000mm, and radius is not less than the steam turbine cylinder of 1000mm, may further comprise the steps:
The first step, line;
In second step, rough mill;
Stay 2～3mm surplus, mill horizontal flange, as the fine finishining benchmark;
In the 3rd step, mill at gantry;
Adopt planer-type milling machine, according to the fine finishining benchmark, the end face of each air admission hole of finish-milling, the finish-milling horizontal flange mills out two stomidiums at the cylinder body two ends, makes size reach the drawing requirement;
The 4th step, the heavy boring abdominal cavity;
Operation one, employing clamping positioning tool are located clamping workpiece;
The method of clamping workpiece location is:
Make the abdominal cavity of workpiece downward, in the stomidium at workpiece two ends, place a support set frock respectively, the stomidium of workpiece is contacted with the last half-turn of support set frock;
The support set frock is positioned in the supporting seat frock, the lower branch of support set frock is contacted with the arc bracing frame of supporting seat frock;
Clamping is realized by a cover support set and supporting seat frock respectively in the two ends of workpiece;
Operation two, according to the fine finishining benchmark, adopt the heavy boring cutter to rough mill Intraabdominal each step surface;
The 5th step, the heavy boring cylindrical;
Adopt cylindrical heavy boring cutter, cylindrical heavy boring cutter is installed on the boring machine periphery of each air inlet of heavy boring workpiece.
2. the rough machining method of steam turbine cylinder foundry goods according to claim 1 is characterized in that: the tolerance control that mill at described the 3rd step gantry is in 0.1mm, and surface roughness reaches Ra3.2.
3. the rough machining method of steam turbine cylinder foundry goods according to claim 1 is characterized in that: described the 4th step operation one described clamping positioning tool comprises support set frock and supporting seat frock;
The support set frock comprises half-turn, lower branch, and last half-turn, lower branch are formed an annular frock, and the external diameter of the annular frock that upper and lower half-turn is formed matches with the stomidium internal diameter at workpiece two ends;
The supporting seat frock comprises base, arc bracing frame, and the arc bracing frame is realized supporting by base; The internal diameter of arc bracing frame matches with the external diameter of annular frock.
4. the rough machining method of steam turbine cylinder foundry goods according to claim 1 is characterized in that: described described cylindrical heavy boring cutter of the 5th step comprises cylindrical heavy boring blade row, cylindrical shoulder pole boring row, transition boring cutter row;
Cylindrical heavy boring blade row comprises the boring cutter fixed mount, and an end of boring cutter fixed mount is stiff end, and the other end is link; The stiff end of boring cutter fixed mount connects the heavy boring cutter, and the link of boring cutter fixed mount is connected with cylindrical shoulder pole boring row;
Cylindrical shoulder pole boring row is provided with link slot, and the length of link slot is greater than the length of the link of boring cutter fixed mount; Cylindrical heavy boring blade row is connected with cylindrical shoulder pole boring row by link; Cylindrical heavy boring blade row can be along the length direction of link slot, with respect to cylindrical shoulder pole boring row translation; The boring of cylindrical shoulder pole row be fixedly set on the transition boring cutter row;
The transition boring cutter row is provided with the holddown groove that matches with cylindrical shoulder pole boring row, and the boring of cylindrical shoulder pole row be fixedly set in the holddown groove of transition boring cutter row.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110445971.3A CN103182622B (en) | 2011-12-27 | 2011-12-27 | The rough machining method of steam turbine cylinder foundry goods |
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| CN201110445971.3A CN103182622B (en) | 2011-12-27 | 2011-12-27 | The rough machining method of steam turbine cylinder foundry goods |
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| CN103182622A true CN103182622A (en) | 2013-07-03 |
| CN103182622B CN103182622B (en) | 2016-02-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921724A (en) * | 2016-04-29 | 2016-09-07 | 共享装备股份有限公司 | Horizontal cylinder assembly supporting device for semicircular cylinder block castings of combustion gas turbine and test method |
| CN109317717A (en) * | 2017-08-01 | 2019-02-12 | 上海电气电站设备有限公司 | Numerical control cylinder boring machine for steam turbine |
| CN109454404A (en) * | 2018-08-30 | 2019-03-12 | 洛阳奇瑞机械科技有限公司 | A kind of optical window skeleton precision castings machine-tooled method of aerial gondola |
| CN110744267A (en) * | 2019-11-14 | 2020-02-04 | 无锡华能热能设备有限公司 | Ring for wind power equipment and machining process |
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| JP2007313595A (en) * | 2006-05-25 | 2007-12-06 | Mitsubishi Heavy Ind Ltd | Positioning pin, and component machining fixture having the same |
| CN201889450U (en) * | 2010-07-05 | 2011-07-06 | 无锡桥联风电科技有限公司 | Adjustable boring cutter row |
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2011
- 2011-12-27 CN CN201110445971.3A patent/CN103182622B/en active Active
Patent Citations (2)
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|---|---|---|---|---|
| JP2007313595A (en) * | 2006-05-25 | 2007-12-06 | Mitsubishi Heavy Ind Ltd | Positioning pin, and component machining fixture having the same |
| CN201889450U (en) * | 2010-07-05 | 2011-07-06 | 无锡桥联风电科技有限公司 | Adjustable boring cutter row |
Non-Patent Citations (3)
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| 朱佳生: "《透平机械制造工艺学》", 31 July 1980, article ""透平机械制造工艺学"", pages: 213 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921724A (en) * | 2016-04-29 | 2016-09-07 | 共享装备股份有限公司 | Horizontal cylinder assembly supporting device for semicircular cylinder block castings of combustion gas turbine and test method |
| CN109317717A (en) * | 2017-08-01 | 2019-02-12 | 上海电气电站设备有限公司 | Numerical control cylinder boring machine for steam turbine |
| CN109454404A (en) * | 2018-08-30 | 2019-03-12 | 洛阳奇瑞机械科技有限公司 | A kind of optical window skeleton precision castings machine-tooled method of aerial gondola |
| CN109454404B (en) * | 2018-08-30 | 2020-11-24 | 洛阳奇瑞机械科技有限公司 | Machining method for precision casting machine of optical window framework of aerial pod |
| CN110744267A (en) * | 2019-11-14 | 2020-02-04 | 无锡华能热能设备有限公司 | Ring for wind power equipment and machining process |
| CN110744267B (en) * | 2019-11-14 | 2022-05-24 | 无锡华能热能设备有限公司 | Ring for wind power equipment and machining process |
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| CN103182622B (en) | 2016-02-03 |
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Effective date of registration: 20170104 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy-Machine Factory Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy-Machine Factory Co., Ltd. |