CN105499671B - A kind of three-axis numerical control method for milling of bend pipe inner surface - Google Patents
A kind of three-axis numerical control method for milling of bend pipe inner surface Download PDFInfo
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- CN105499671B CN105499671B CN201511021759.9A CN201511021759A CN105499671B CN 105499671 B CN105499671 B CN 105499671B CN 201511021759 A CN201511021759 A CN 201511021759A CN 105499671 B CN105499671 B CN 105499671B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/08—Disc-type cutters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/04—Overall shape
- B23C2200/045—Round
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/20—Number of cutting edges
- B23C2210/202—Number of cutting edges three
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Abstract
The present invention relates to a kind of three-axis numerical control method for milling of bend pipe inner surface, Milling Process is carried out to bend pipe inner surface using common three axis numerically controlled machine, the face angle of throat disk of circular arc three and metal long cutting tool bar, comprised the following steps：(1) by the inner surface Milling Process of bend pipe two ends straight line portion into straight tube face, by the inner surface Milling Process of elbow curvature part into step surface；(2) bend pipe, as blank, sets up the threedimensional model of the bend pipe using after roughing, and the elbow curvature part is divided into region I, region II, region III, region IV, region V, and carries out cutter path planning to each region respectively；(3) actual cut processing is carried out to bend pipe inner surface according to the cutter path.The processing method not only breaches limitation of the five-axle number control machine tool to milling head size, at the same it is high compared to special equipment versatility, various model bend pipe inner surfaces can be processed, technique is simple, and cost is relatively low.
Description
Technical field
The present invention relates to bend pipe surface Computerized Numerical Control processing technology field, more particularly to a kind of three-axis numerical control milling of bend pipe inner surface
Cutting method.
Background technology
Bend pipe is one of larger part of manufacture difficulty in nuclear power product.At present, the manufacture of domestic bend pipe is mainly bending
Shaping and machining two ways.Brake forming is first to manufacture straight tube, is then manually bent by bending machine, this to add
Work mode eliminates the complex surface machining to bend pipe, simplifies manufacturing process, but brake forming Surface Quality has very big
Damage, limited by conditions such as wall thickness dimension and material properties, brake forming easily causes bend pipe inner arc material stacking, outer arc material
Expect interior tissue damage, success rate is relatively low.
Machining is to obtain expected surface quality by surface machining on the bend pipe blank of forging, machinery
Processing bend pipe outer curved surface be easier to, but its curved inner surface due to inner space it is narrow and small, tool motion be limited, difficulty of processing compared with
Greatly.
At present, bend pipe inner surface machining is used five-shaft numerical control milling method or is added using special auxiliary equipment
Work, five-shaft numerical control milling method need to use five-shaft numerical control milling head, and five-shaft numerical control milling head size is generally large, easily to tube wall
Cause interference；Current domestic special auxiliary equipment high cost, poor universality, complicated mechanism.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of three-axis numerical control method for milling of bend pipe inner surface, to solve
Certainly the problem of existing bend pipe manufacture inner surface machining difficulty.Utilize common three axis numerically controlled machine and cutter, it becomes possible to plus
Work bend pipe inner surface, reaches expected surface quality, and apparatus and process is simple, low cost.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of three-axis numerical control method for milling of bend pipe inner surface of the present invention, uses common three axis numerically controlled machine, the face of circular arc three
Angle of throat disk and metal long cutting tool bar carry out Milling Process to bend pipe inner surface, comprise the following steps：
(1) roughing：By the inner surface Milling Process of bend pipe two ends straight line portion into straight tube face, by elbow curvature portion
Point inner surface Milling Process into step surface；
(2) cutter path is planned：The bend pipe sets up the threedimensional model of the bend pipe as blank using after roughing, and will
The elbow curvature part is divided into region I, region II, region III, region IV, region V, and each region is carried out respectively
Cutter path is planned：
The region I and the region III cutter path：From end face center point feed, inversely fed along cutter shaft, feed side
Formula is the cross section profile climb cutting feed along the region I and the region III, uses the front edge of the face angle of throat disk of circular arc three, side
Sword and back of the body sword successively region I described in machining and the region III inner surface, wherein every layer of thickness of cutting is 1mm；
The region II and the cutter path of the region IV：From end face center point feed, inversely fed along cutter shaft, feed side
Formula be along the region II and the region IV cross section profile climb cutting feed, using the face angle of throat disk of circular arc three front edge and
Side edge successively region II described in machining and the outer arc inner surface in the region IV, wherein every layer of thickness of cutting is 1mm；
The cutter path of region V：On the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary cutter shaft,
Inversely fed along cutter shaft, tool path pattern is the cross section profile climb cutting feed along the region V, uses the face angle of throat of circular arc three
The preceding knife of disk, side tool and back of the body knife successively region V described in machining, wherein every layer of thickness of cutting is 1mm；
Cleaning residual blank cutter path：On the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary knife
Axle, along the reverse three-shaft linkage feed of cutter shaft, step pitch 1mm, cut-back region V residual blanks；
(3) actual cut processing is carried out to bend pipe inner surface according to the cutter path.
Further, step (1) described Milling Process includes peripheral milling or turning.
Further, in step (2) region V cutter paths and cleaning residual blank cutter path, during the swivel knife shaft,
First feed mode is broken line feed, and final withdrawing mode is broken line withdrawing, to prevent the interference of cutter and the mouth of pipe.
Further, step (2) cutter path is subjected to dynamic simulative emulation before step (3), confirmed whole
Not the problem of process did not had to cut and collided, it is ensured that the correctness of the cutter path.
Further, step (3) actual cut processing point semifinishing and the finishing.
Further, step (3) the actual cut processing is according to region I, region II, region III, region IV, region V
Order carry out successively.
The present invention has the beneficial effect that：
A kind of three-axis numerical control method for milling for bend pipe inner surface that the present invention is provided, is added using common three axis numerically controlled machine
Construction equipment and stage property, it is possible to realize the mechanical processing technique to bend pipe inner surface, not only break through five-axle number control machine tool to milling head
The limitation of size, at the same it is high compared to special equipment versatility, various model bend pipe inner surface processing can be processed, it is adaptable to 90 °
Bend pipe inner surface is processed, and technique is simple, and cost is relatively low.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is bend pipe inner surface machining sketch chart；
Fig. 2 is blahk structure schematic diagram after roughing；
Fig. 3 is that elbow curvature subregion divides schematic diagram；
Fig. 4 is region III cutter path schematic diagram；
Fig. 5 is the cutter path schematic diagram of region IV；
Fig. 6 is the cutter path schematic diagram of region V；
Fig. 7 is cleaning residual blank cutter path schematic diagram；
Fig. 8 is broken line feed schematic diagram；
Wherein：1 bend pipe, the face angle of throat disk of 2 circular arc three, 3 metal long cutting tool bars, 4 machine tool chief axis.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used for the principle for explaining the present invention together with embodiments of the present invention.
By taking 90 ° of bend pipe solid castings as an example, it is Φ 310mm's that 90 ° of bend pipe solid castings are processed into diameter of bore
90 ° of bend pipes；Wherein 90 ° bend pipes include long end straight section, short end straight section and 90 ° of bending segmental arcs, long end straight section 445mm, short end straight section
70mm, radius of curvature R 255mm.
UsingThree axle horizontal digital-control milling-boring machines, model Italy PAMA SPEEDRAM 2000.
The inner surface of bend pipe 1 is processed using the connection face angle of throat disk 2 of circular arc three of metal long cutting tool bar 3, as shown in figure 1, specific side
Method is as follows：
1st, roughing：On three axle horizontal digital-control milling-boring machines, bend pipe is positioned and clamped, rotary table, using circumference
The mode of milling, is processed into straight tube face, bending section from the mouth of pipe feed of long end straight section and short end straight section by straight part respectively
Step surface is processed into, as shown in Figure 2.
2nd, using roughing back elbow as blank, using final size bend pipe as part, using NX8.5 softwares to the blank and
Part carries out three-dimensional modeling, and the bending section of part is divided into region I, region II, region III, region IV, V 5, region
Region, as shown in Figure 3；The cutter path in each region is planned, then with the automatic cutter into each region of software programming
Track, be specially：
Region I：From long end straight section end face center point feed, using " die cavity milling " function of software, cancel cutting parameter choosing
Xiang Kazhong " fault-tolerant processing ", it is allowed to which cutter is cut using back of the body sword, is inversely fed along cutter shaft, tool path pattern is along the region I
Cross section profile climb cutting feed, using the front edge of the face angle of throat disk of circular arc three, side edge and back of the body sword successively in machining region I
Surface, wherein every layer of thickness of cutting is 1mm；
Region II：From long end straight section end face center point feed, using " die cavity milling " function of software, cutting parameter choosing is chosen
Xiang Kazhong " fault-tolerant processing ", is forbidden cutter to be cut using back of the body sword, is inversely fed along cutter shaft, tool path pattern is along the region II
Cross section profile climb cutting feed, use front edge and the side edge successively region II described in machining of the face angle of throat disk of circular arc three
Outer arc inner surface, wherein every layer of thickness of cutting is 1mm；
Region III：Rotary table, from the end face center point feed of short end straight section, using " die cavity milling " function of software, takes
" fault-tolerant processing " in the cutting parameter tab that disappears, it is allowed to which cutter is cut using back of the body sword, is inversely fed along cutter shaft, tool path pattern is
Along the cross section profile climb cutting feed of the region III, successively cut using the front edge of the face angle of throat disk of circular arc three, side edge and back of the body sword
The processing region III inner surface is cut, wherein every layer of thickness of cutting is 1mm, as shown in Figure 4.
Region IV：From the end face center point feed of short end straight section, using " die cavity milling " function of software, cutting parameter choosing is chosen
Xiang Kazhong " fault-tolerant processing ", is forbidden cutter to be cut using back of the body sword, is inversely fed along cutter shaft, tool path pattern is along the region IV
Cross section profile climb cutting feed, use front edge and the side edge successively region IV described in machining of the face angle of throat disk of circular arc three
Outer arc inner surface, wherein every layer of thickness of cutting is 1mm, as shown in Figure 5.
Region V：Using " die cavity milling " function of software, cancel " the fault-tolerant processing " in cutting parameter tab, it is allowed to knife
Tool is cut using back of the body sword, and on the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary cutter shaft inversely enters along cutter shaft
Give, tool path pattern is the cross section profile climb cutting feed along the region V, uses the preceding knife of the face angle of throat disk of circular arc three, side tool
With back of the body knife successively region V described in machining, wherein every layer of thickness of cutting is 1mm, as shown in Figure 6.
Cleaning residual blank cutter path：Using software " fixing axle Surface contour milling " function, using " curved surface area drives
It is dynamic " method " driving solid " is set, on the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary cutter shaft,
Along the reverse three-shaft linkage feed of cutter shaft, step pitch 1mm, cleaning V regions remain blank, as shown in Figure 7.
The 3rd, cutter path is carried out to the dynamic simulative emulation of two and three dimensions, whole process is simulated, whole add is confirmed
The problem of work process did not had to cut and collided, verifies the correctness of cutter path.
4th, cutter path is post-processed, the G code that lathe can be recognized is formed, in order to prevent cutter shaft and the mouth of pipe during swivel knife shaft
Interference, by region V and cleaning remain blank cutter path first feed and final withdrawing mode be revised as broken line feed and
Broken line withdrawing, as shown in Figure 8.
5th, G code is inputted into lathe, actual cut processing is carried out to bend pipe, first from the long He of end straight section feed machining area I
Region II, then rotary table, from short end straight section feed machining area III, region IV and region V, processes and is divided into half finishing
Work and finishing, every layer of cutting depth are 1mm, and feed speed is 100~200mm/min, and rotating speed is 100~300r/min.
The embodiments of the invention provide a kind of three-axis numerical control milling method of bend pipe inner surface, three common axles are utilized
Digit Control Machine Tool process equipment and cutter, it is possible to realize the mechanical processing technique to bend pipe inner surface, not only break through five-shaft numerical control
Limitation of the milling head to size, at the same it is high compared to special equipment versatility, various model bend pipe inner surfaces, technique letter can be processed
Single, cost is relatively low.
The foregoing is intended to be a preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.
Claims (6)
1. a kind of three-axis numerical control method for milling of bend pipe inner surface, using common three axis numerically controlled machine, the face angle of throat disk of circular arc three and
Metal long cutting tool bar carries out Milling Process to bend pipe inner surface, it is characterised in that comprise the following steps：
(1) roughing：By the inner surface Milling Process of bend pipe two ends straight line portion into straight tube face, by elbow curvature part
Inner surface Milling Process is into step surface；
(2) cutter path is planned：The bend pipe sets up the threedimensional model of the bend pipe as blank using after roughing, and will be described
Elbow curvature part is divided into region I, region II, region III, region IV, region V, and carries out cutter to each region respectively
Trajectory planning：
The region I and the region III cutter path：From end face center point feed, inversely fed along cutter shaft, tool path pattern is
Along the cross section profile climb cutting feed of the region I and the region III, using the front edge of the face angle of throat disk of circular arc three, side edge and
Sword successively region I described in machining and the region III inner surface are carried on the back, wherein every layer of thickness of cutting is 1mm；
The region II and the cutter path of the region IV：From end face center point feed, inversely fed along cutter shaft, tool path pattern is
Along the cross section profile climb cutting feed in the region II and the region IV, the front edge and side edge of the face angle of throat disk of circular arc three are used
Successively region II described in machining and the outer arc inner surface in the region IV, wherein every layer of thickness of cutting is 1mm；
The cutter path of region V：On the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary cutter shaft, along knife
Axle is inversely fed, and tool path pattern is the cross section profile climb cutting feed along the region V, uses the face angle of throat disk of circular arc three
Preceding knife, side tool and back of the body knife successively region V described in machining, wherein every layer of thickness of cutting is 1mm；
Cleaning residual blank cutter path：On the premise of ensureing that the metal long cutting tool bar is not touched with tube wall, multiple rotary cutter shaft, edge
The reverse three-shaft linkage feed of cutter shaft, step pitch 1mm, cut-back region V residual blanks；
(3) actual cut processing is carried out to bend pipe inner surface according to the cutter path.
2. the three-axis numerical control method for milling of bend pipe inner surface according to claim 1, it is characterised in that step (1) described milling
Cutting processing includes peripheral milling.
3. the three-axis numerical control method for milling of bend pipe inner surface according to claim 1, it is characterised in that step (2) region V knives
Have in track and cleaning residual blank cutter path, during the swivel knife shaft, first feed mode is broken line feed, final withdrawing
Mode is broken line withdrawing.
4. the three-axis numerical control method for milling of bend pipe inner surface according to claim 1, it is characterised in that before step (3)
Step (2) cutter path is subjected to dynamic simulative emulation.
5. the three-axis numerical control method for milling of bend pipe inner surface according to claim 1, it is characterised in that step (3) described reality
Border machining point semifinishing and finishing.
6. the three-axis numerical control method for milling of bend pipe inner surface according to claim 1, it is characterised in that step (3) described reality
Border machining is carried out successively according to the order in region I, region II, region III, region IV, region V.
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| CN201511021759.9A CN105499671B (en) | 2015-12-30 | 2015-12-30 | A kind of three-axis numerical control method for milling of bend pipe inner surface |
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| CN201511021759.9A CN105499671B (en) | 2015-12-30 | 2015-12-30 | A kind of three-axis numerical control method for milling of bend pipe inner surface |
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| CN105499671B true CN105499671B (en) | 2017-07-14 |
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| CN112059258B (en) * | 2020-09-14 | 2023-03-28 | 吉林省迅磊机械科技有限公司 | Three-axis numerical control milling method for idle opening of cutting edge of cold stamping die |
| CN112548509B (en) * | 2020-12-08 | 2022-08-23 | 大连瑞谷科技有限公司 | Ball cage pocket machining process |
| CN114714098A (en) * | 2022-04-11 | 2022-07-08 | 沧州科威电子有限责任公司 | Machining device and processing method for inner cavity of bent pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4491538B1 (en) * | 2009-05-22 | 2010-06-30 | 野田金型有限会社 | Manufacturing method of machined elbow |
| CN102451976B (en) * | 2010-10-29 | 2013-10-30 | 上海重型机器厂有限公司 | Manufacturing method for hot arc bent pipe of AP1000 nuclear power main pipeline |
| CN102166665B (en) * | 2010-12-23 | 2012-09-12 | 大连理工大学 | Five-axis NC (numerical control) milling method for internal surfaces of bent pipes |
| CN102156441B (en) * | 2010-12-23 | 2012-07-04 | 大连理工大学 | Method for machining outer surface of bent pipe by three-shaft numerically controlled milling |
| CN103862225A (en) * | 2012-12-14 | 2014-06-18 | 上海重型机器厂有限公司 | Processing method for inner hole of elbow of nuclear power main pipeline |
| EP3563954A1 (en) * | 2013-07-31 | 2019-11-06 | Daido Die & Mold Steel Solutions Co., Ltd. | Method of manufacturing an elbow and elbow |
| CN104607512B (en) * | 2015-02-08 | 2017-02-22 | 中国第一重型机械股份公司 | Bend forming method of large-angle pipeline with high precision, large pipe diameter and small bending diameter ratio |
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