CN108080684A - A kind of ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method - Google Patents
A kind of ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method Download PDFInfo
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- CN108080684A CN108080684A CN201711361338.XA CN201711361338A CN108080684A CN 108080684 A CN108080684 A CN 108080684A CN 201711361338 A CN201711361338 A CN 201711361338A CN 108080684 A CN108080684 A CN 108080684A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
A kind of ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method, lathe working ability and processing performance are combined when processing the product, machining area is divided into several annulus, different process tools is selected according to the architectural characteristic of different annulus, so that the milling track of cutter is simpler rationally, empty feed, cutter lifting significantly reduce, and cutter can once complete the processing of an annulus into withdrawing, tool cutting process is more steady, and piece surface processing finish reaches Ra6.3.The present invention takes full advantage of the advantage of four axis boring and milling machines linkage, ensure that the dimensional accuracy of product milling part, improve production efficiency 50% by reasonable arrangement technical process, division cutting zone.
Description
Technical field
The present invention relates to field of machining, are specifically outside a kind of ring-shaped piece abnormal shape circular arc for a diameter of Φ 2000mm
Type face numerical control milling method.
Background technology
The part is one of most important parts of certain solid rocket motor case, in product final products in use,
Play a part of carrying, connection, the processing quality of workpiece directly affects the final performance of product.And the part outer mold surface protrudes
Part-structure is final Assembly interface size, and geometric tolerance and size tolerance requirements are high.
The part belongs to circular thin-wall component, and workpiece is mainly made of two parts：Thin wall cylinder section part, reinforcing ring muscle portion
Point, external form protrusion, thin wall cylinder section part and enhancing steel ring part can be considered as simple X-Y scheme revolution entity, external form
Protrusion can be considered the protrusion of arc section.
For such part, the process of turnery processing can remove substantial amounts of material, but be removed in the middle part of external form
Arc surface must could be molded by way of milling, which, which belongs to major diameter part, to stand on digital-control boring-milling machine
Outer mold surface circular arc portion is processed, the processing efficiency of milling is relatively low and finished surface is difficult to meet design objective requirement, therefore should
Circular arc is intersected in circular arc portion A, B above and below part between ring stiffener, hollows C, D, and ABCD faces with projection
The numerical control boring-mill work in face is the processing difficulties of the product.
The processing universal method of such product is that A, B, C, D face are divided into 18 faces in circumferencial direction at present, then one by one
Programming processing, feed process cutter lifting, feed many times, programming it is complicated, cutter path is in disorder, and processing efficiency is extremely low.
The particularity of the Workpiece structure, the complexity of curved surface and higher required precision determine setting for its numerical control program
Count difficulty.The design of numerical control program must coincide the clamping state and technical process of product.In addition, how to select reasonably to process
Cutter, cutting mode, machined parameters are to ensure that high-quality, the efficient key for completing processing.
The content of the invention
To overcome the prior art is utilized to be filled present in a kind of large diameter thin wall ring-shaped piece abnormal shape circular arc outer mold surface of processing
Folder is difficult, the deficiency of process complexity, and the present invention proposes a kind of large diameter thin wall ring-shaped piece abnormal shape circular arc outer mold surface numerical control
Milling method.
The present invention detailed process be：
Step 1, blank is installed.
Step 2, process route is determined.The table of upper circular arc annulus is molded by identified process route successively Milling Machining
Face, the surface of lower circular arc annulus, the surface of the surface of upper fillet annulus and lower fillet annulus.
When determining process route, the machined surface of ring-shaped piece is divided into upper circular arc annulus, lower circular arc annulus, upper fillet ring
Band and lower fillet annulus.The upper fillet annulus is the lower surface of reinforcing rib and an excessive fillet of circle of upper circular arc annulus diameter.
The big 1mm of radius of the radius ratio blank thin wall cylinder section of upper circular arc annulus.Lower surface and lower circular arc of the lower fillet annulus for reinforcing rib
The one excessive fillet of circle of annulus diameter；The big 1mm of radius of the radius ratio blank thin wall cylinder section of lower circular arc bad band.Upper circular arc annulus
Surface at the plane tangent of upper fillet annulus with forming intersecting lens；The surface of lower circular arc annulus and the surface phase of lower fillet annulus
It cuts place and forms lower intersecting lens；The surface of upper circular arc annulus and upper thickening arc block are tangent by circular arc, and point of contact is point of penetration on first；
The surface of lower circular arc annulus and upper thickening arc block are tangent by circular arc, and point of contact is point of penetration on second；The surface of lower fillet annulus
Tangent by circular arc with lower thickening arc block, point of contact is point of penetration on the 3rd；The surface of lower circular arc annulus passes through with lower thickening arc block
Circular arc is tangent, and point of contact is point of penetration on the 4th.
Step 3, technological parameter is determined.
Identified technological parameter is：Circular arc annulus and lower circular arc annulus on Φ 50mm square shoulder milling cutter Milling Machinings are used
When, the rotating speed of milling machine spindle is 400rmp/min, and the amount of feeding of milling is 110mm/min, cutting depth 3mm.With diameter
Fillet annulus and during lower fillet annulus on 60mm corn rose cutter Milling Machinings, the rotating speed of milling machine spindle are 120rmp/min, milling
The amount of feeding cut is 30mm/min, cutting depth 31.5mm.
Step 4, in Milling Process circular arc annulus surface.
The square shoulder milling cutter of a diameter of 50mm is selected, cutter feed at 60mm below point of penetration from first is herein processing
Zero point, depth of cut 3mm move 30mm along the X direction, reach the first and cut a little.Lathe does the inverse time around platen
Pin rotates, and makes to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter 400rmp/min is certainly
Turn；The velocity of rotation of platen is 6 degree per minute.Cutter starts machined part.Make the of the workpiece when workpiece turns to
When point of penetration is overlapped with the edge of cutter on two, lathe stops operating, and cutter is moved on second to the negative direction of X-coordinate and cuts
Point lower section 60mm places, lathe starts to rotate counterclockwise, and when cutter is moved on first at the 60mm of point of penetration lower section, returns to processing zero
Point completes first time milling.
Cutter is moved on first at point of penetration to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little.Adjustment
The depth of cut of cutter is 3mm.Start lathe, repeat the first time milling process, start second of milling.When workpiece rotates
When point of penetration is with cutter on to make the workpiece second, lathe stops operating, and cutter is moved to the negative direction of X-coordinate on second
60mm places below point of penetration, lathe starts to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration on first, returns to and adds
Work zero point completes second of milling.
Cutter described in circulating repetition is mobile and milling process, until the square shoulder milling cutter edge of a diameter of 50mm completely with upper phase
It is bonded at intersection, process finishing.
When square shoulder milling cutter edge is bonded completely at upper intersecting lens, after completing last time milling, cutter returns to processing zero
Point completes the Milling Process on the surface to upper circular arc annulus.
Step 5, fillet annulus in Milling Process.
It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts blank thin wall cylinder section
Surface from first below point of penetration at 60mm along X positive direction feeds, cutter rotating speed is 120r/min, the amount of feeding of milling
For 60mm/min, cutter is constantly mobile until cutter edge is bonded with upper reinforcing rib lower plane 1.Lathe table top starts to turn counterclockwise
Dynamic, cutter is around part milling, and the amount of feeding of milling is 30mm/min, when workpiece turns to point of penetration on make the workpiece second
When being overlapped with the edge of cutter, lathe stops operating, and cutter is moved on second 60mm below point of penetration to the negative direction of X-coordinate
Place, lathe start to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration on first, cutter exits completely returns to processing
Zero point so far completes the processing of upper fillet annulus.
Step 6, part is turned around clamping.
Step 7, circular arc annulus under Milling Process.
The square shoulder milling cutter of a diameter of 50mm is selected, cutter is herein processing from feed at 60mm below point of penetration on the 4th
Zero point, depth of cut 3mm move 30mm along the X direction, reach the first and cut a little.Lathe does the inverse time around platen
Pin rotates, and makes to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter 400rmp/min is certainly
Turn；The velocity of rotation of platen is 6 degree per minute.Cutter starts machined part.Make the of the workpiece when workpiece turns to
When point of penetration is overlapped with the edge of cutter on three, lathe stops operating, and cutter is moved on the 3rd to the negative direction of X-coordinate and cuts
Point lower section 60mm places, lathe starts to rotate counterclockwise, and when cutter is moved on the 3rd at the 60mm of point of penetration lower section, returns to processing zero
Point completes first time milling.
Cutter is moved on the 4th at point of penetration to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little.Adjustment
The depth of cut of cutter is 3mm.Start lathe, repeat the first time milling process, start second of milling.When workpiece rotates
When point of penetration is with cutter on to make the workpiece the 3rd, lathe stops operating, and cutter is moved to the negative direction of X-coordinate on second
60mm places below point of penetration, lathe starts to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration on the 4th, returns to and adds
Work zero point completes second of milling.
Cutter movement and milling process described in circulating repetition, until the square shoulder milling cutter edge of a diameter of 50mm pastes completely with place
It closes, process finishing.In each Xun Huan, the moving direction of cutter is X-direction, and moving step length is 30 millimeters.
When square shoulder milling cutter edge on second at point of penetration completely with being bonded, after completing last time milling, cutter, which returns, to be added
Work zero point completes the Milling Process on the surface to lower circular arc annulus.
Step 8, fillet annulus under Milling Process.
It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts blank thin wall cylinder section
Surface from first below point of penetration at 60mm along X positive direction feeds, cutter rotating speed 120r/min, the amount of feeding of milling is
60mm/min, cutter is constantly mobile until cutter edge is bonded with plane on lower reinforcing rib.Lathe table top starts to rotate counterclockwise,
For cutter around part milling, the amount of feeding of milling is 30mm/min, when workpiece turn on make the workpiece the 3rd point of penetration with
When the edge of cutter overlaps, lathe stops operating, and cutter is moved on the 3rd 60mm below point of penetration to the negative direction of X-coordinate
Place, lathe start to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration on the 4th, cutter exits completely returns to processing
Zero point so far completes the processing of lower fillet annulus.So far, whole processing of part abnormal shape circular arc outer mold surface are completed.
In each Milling Process Xun Huan, the moving direction of cutter is X-direction, and moving step length is 30 millimeters.
Problem to be solved of the present invention is thin-wall ring part abnormal shape circular arc outer mold surface during NC milling
Cutter path designs.The present invention combines lathe working ability and processing performance when processing the product, and machining area is divided into
Several annulus, and different process tools is selected according to the architectural characteristic of different annulus so that the milling track of cutter is more
Advantages of simple, empty feed, cutter lifting significantly reduce, and cutter can once complete the processing of an annulus, Tool in Cutting mistake into withdrawing
Cheng Gengjia is steady, and piece surface processing finish reaches Ra6.3.
The present invention takes full advantage of the excellent of four axis boring and milling machines linkage by reasonable arrangement technical process, division cutting zone
Gesture ensure that the dimensional accuracy of product milling part, improve production efficiency 50%.
Description of the drawings
Fig. 1 is the structure diagram of finished part part.
Fig. 2 is the structure diagram of blank.
Fig. 3 is part by numerical control Milling Machining subregion schematic diagram 1.
Fig. 4 is the schematic diagram reversed end for end after clamping.
Fig. 5 is the flow chart of the present invention.
In figure：Reinforcing rib lower plane on 1.；2. plane on lower reinforcing rib；A. upper circular arc annulus；B. circular arc annulus is descended；C. on
Fillet annulus；D. fillet annulus is descended；A1. point of penetration on first；A2. point of penetration on second；A3. point of penetration on the 3rd；A2. the 4th
Upper point of penetration；B1. upper intersecting lens；B2. intersecting lens is descended；E. thin wall cylinder section；
Specific embodiment
The present embodiment is the ring-shaped piece abnormal shape circular arc outer mold surface NC milling side of a diameter of Φ 2000mm of external form a kind of
Method.The class ring-shaped piece of a diameter of Φ 2000mm of the major diameter ring-shaped piece, the wall thickness of blank thin wall cylinder section E is 13mm,
There is ring stiffener at two at part upper surface and each 500mm in lower face, the thickness of ring stiffener is 50mm, and annular adds
The outer diameter of strengthening tendons is Φ 2200mm, has two pieces of thickening arc blocks in region at the reinforcing rib of both sides between reinforcing rib, thickeies arc
The external form of block and reinforcing rib are isocentric circular arcs, thicken the small 30mm of radius ratio reinforcing rib of arc block, thickening bigger 50mm than thin-walled portion
The ring image angle degree of arc block is 60 degree, thickeies the height of arc block for 65mm, and thickening arc block is by 30 degree of oblique line to thin wall cylinder section
Region transfers.This example is exactly to be formed by the processing method of numerical control milling on the inside of two reinforcing ribs, is thickeied thin on the outside of arc block
Wall region since the region cannot carry out turnery processing, can only be molded by way of milling, but presence adds Milling Process again
The problem of work efficiency rate is low, therefore the efficiency for how improving Milling Process at this is the problem to be solved of the example.Ring-shaped piece
Shape it is as shown in Figure 2.
The detailed process of the present embodiment is：
Step 1, blank is installed.
The blank of the ring-shaped piece is stood on large-sized numerical control boring and milling platform of machine tool；It is distributed on down and added by 4 pressing plates
On the circumference of strengthening tendons and it is pressed on the lower reinforcing rib of blank lower face one end in plane 2.By dial gauge to blank thin-walled
Cylinder section E carries out centering, and making the jerk value of dial gauge, blank is completed by clamping platen after above method centering no more than 0.05mm
The installation of blank.
Step 2, process route is determined.
By identified process route successively Milling Machining be molded the surface of upper circular arc annulus, lower circular arc annulus surface,
The surface of upper fillet annulus and the surface of lower fillet annulus.
As shown in figure 3, by the machined surface of ring-shaped piece be divided into upper circular arc annulus A, lower circular arc annulus B, upper fillet annulus C and
Lower fillet annulus D.The upper fillet annulus C is a circle excessive fillet of the lower surface with upper circular arc annulus A diameters of reinforcing rib.On
The big 1mm of radius of the radius ratio blank thin wall cylinder section E of circular arc annulus A.Lower fillet annulus D is the lower surface of reinforcing rib and lower circular arc
The one excessive fillet of circle of annulus B diameters；The big 1mm of radius of the bad radius ratio blank thin wall cylinder section E with B of lower circular arc.Upper circular arc ring
Surface with A at the plane tangent of upper fillet annulus C with forming upper intersecting lens b1；The surface of lower circular arc annulus B and lower fillet ring
Lower intersecting lens b2 is formed at plane tangent with D；The surface of upper circular arc annulus A and upper thickening arc block are tangent by circular arc, point of contact
For point of penetration a1 on first；The surface of lower circular arc annulus B and upper thickening arc block are tangent by circular arc, and point of contact is point of penetration on second
a2；The surface of lower fillet annulus D and lower thickening arc block are tangent by circular arc, and point of contact is point of penetration a3 on the 3rd；Lower circular arc annulus B
Surface and lower thickening arc block it is tangent by circular arc, point of contact is point of penetration a4 on the 4th.
Identified process route is：
The first step, the surface of the upper circular arc annulus A of square shoulder milling cutter processing；Second step, the upper fillet annulus C's of profile milling cutter processing
Surface；3rd step, turn around clamping；4th step, the surface of the lower circular arc annulus B of square shoulder milling cutter processing；5th step, profile milling cutter processing
The surface of upper fillet annulus D.
The surface of upper circular arc annulus A and the surface of lower circular arc annulus B are processed using square shoulder milling cutter.
Step 3, technological parameter is determined.
The technological parameter includes rotating speed, the amount of feeding, the cutting depth of milling machine shaft.Using Φ 50mm square shoulder milling cutters
On Milling Machining during circular arc annulus A and lower circular arc annulus B, the rotating speed of milling machine spindle is 400rmp/min, and the amount of feeding of milling is
110mm/min, cutting depth 3mm.With fillet annulus C and lower fillet annulus D on diameter 60mm corn rose cutter Milling Machinings
When, the rotating speed of milling machine spindle is 120rmp/min, and the amount of feeding of milling is 30mm/min, cutting depth 31.5mm.
Step 4, in Milling Process circular arc annulus A surface.
Select the square shoulder milling cutter of a diameter of 50mm, cutter feed at 60mm below point of penetration a1 points from first, herein for
Zero point is processed, depth of cut 3mm moves 30mm along the X direction, reaches the first and cuts a little.Lathe is done around platen
It rotates counterclockwise, makes to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter 400rmp/
Min rotations；The velocity of rotation of platen is 6 degree per minute.Cutter starts machined part.Make the workpiece when workpiece turns to
Second on point of penetration a2 points when being overlapped with the edge of cutter, lathe stops operating, and cutter is moved to the negative direction of X-coordinate
On two below point of penetration a2 points at 60mm, lathe starts to rotate counterclockwise, when cutter is moved on first below point of penetration a1 points
At 60mm, processing zero point is returned to, completes first time milling.
Cutter is moved on first at point of penetration a1 points to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little.
The depth of cut for adjusting cutter is 3mm.Start lathe, repeat the first time milling process, start second of milling.Work as workpiece
When turning to point of penetration a2 points and cutter on make the workpiece second, lathe stops operating, and cutter is moved to the negative direction of X-coordinate
On to second below point of penetration a2 points at 60mm, lathe starts to rotate counterclockwise, when cutter is rotated to point of penetration a1 points on first
At the 60mm of lower section, processing zero point is returned to, completes second of milling.
Cutter described in circulating repetition is mobile and milling process, until the square shoulder milling cutter edge of a diameter of 50mm completely with upper phase
It is bonded at intersection b1, process finishing.In each Xun Huan, the moving direction of cutter is X-direction, and moving step length is 30 millimeters.
When square shoulder milling cutter edge is bonded completely at upper intersecting lens b1, after completing last time milling, cutter returns to processing
Zero point completes the Milling Process on the surface to upper circular arc annulus A.
Step 5, fillet annulus C in Milling Process.
It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts blank thin wall cylinder section E
Surface from first below point of penetration a1 points at 60mm along X positive direction feeds, cutter rotating speed is 120r/min, milling into
It is 60mm/min to amount, cutter is constantly mobile until cutter edge is bonded with upper reinforcing rib lower plane 1.Lathe table top starts the inverse time
Pin rotates, and for cutter around part milling, the amount of feeding of milling is 30mm/min, is cut when workpiece is turned on make the workpiece second
When access point a2 points are overlapped with the edge of cutter, lathe stops operating, and cutter is moved to point of penetration on second to the negative direction of X-coordinate
60mm places below a2 points, lathe starts to rotate counterclockwise, when cutter is rotated on first at the 60mm of point of penetration a1 points lower section, cutter
It exits completely and returns to processing zero point, so far complete the processing of upper fillet annulus C.
Step 6, part turns around clamping, and the pressing plate of lathe is made to be pressed at reinforcing rib lower plane 1, centering outer circle, jerk value
No more than 0.05mm.
Step 7, circular arc annulus B under Milling Process.
Select the square shoulder milling cutter of a diameter of 50mm, cutter from feed at 60mm below point of penetration a4 points on the 4th, herein for
Zero point is processed, depth of cut 3mm moves 30mm along the X direction, reaches the first and cuts a little.Lathe is done around platen
It rotates counterclockwise, makes to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter 400rmp/
Min rotations；The velocity of rotation of platen is 6 degree per minute.Cutter starts machined part.Make the workpiece when workpiece turns to
The 3rd on point of penetration a3 points when being overlapped with the edge of cutter, lathe stops operating, and cutter is moved to the negative direction of X-coordinate
On three below point of penetration a3 points at 60mm, lathe starts to rotate counterclockwise, when cutter is moved on the 3rd below point of penetration a3 points
At 60mm, processing zero point is returned to, completes first time milling.
Cutter is moved on the 4th at point of penetration a4 points to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little.
The depth of cut for adjusting cutter is 3mm.Start lathe, repeat the first time milling process, start second of milling.Work as workpiece
It turns on make the workpiece the 3rd when cutting a3 points and cutter, lathe stops operating, and cutter is moved to the negative direction of X-coordinate
On second below point of penetration a2 points at 60mm, lathe starts to rotate counterclockwise, when cutter is rotated to point of penetration a4 points on the 4th
At square 60mm, processing zero point is returned to, completes second of milling.
Cutter described in circulating repetition is mobile and milling process, until the square shoulder milling cutter edge of a diameter of 50mm completely at b2
Fitting, process finishing.In each Xun Huan, the moving direction of cutter is X-direction, and moving step length is 30 millimeters.
When square shoulder milling cutter edge on second at point of penetration b2 completely with being bonded, after completing last time milling, cutter returns
Zero point is processed, completes the Milling Process on the surface to lower circular arc annulus B.
Step 8, fillet annulus D under Milling Process.
It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts blank thin wall cylinder section E
Surface from first below point of penetration a1 points at 60mm along X positive direction feeds, cutter rotating speed 120r/min, the feeding of milling
It measures as 60mm/min, cutter is constantly mobile until cutter edge is bonded with plane 2 on lower reinforcing rib.Lathe table top starts counterclockwise
It rotates, for cutter around part milling, the amount of feeding of milling is 30mm/min, is cut when workpiece is turned on make the workpiece the 3rd
When point a3 points are overlapped with the edge of cutter, lathe stops operating, and cutter is moved to point of penetration a3 on the 3rd to the negative direction of X-coordinate
At the 60mm of point lower section, lathe starts to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration a4 points on the 4th, cutter is complete
Complete exit returns to processing zero point, so far completes the processing of lower fillet annulus D.So far, the complete of part abnormal shape circular arc outer mold surface is completed
Portion processes.
Claims (4)
- A kind of 1. ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method, which is characterized in that detailed process is：Step 1, blank is installed；Step 2, process route is determined：The surface, the surface of lower circular arc annulus, upper circle of upper circular arc annulus are molded by identified process route successively Milling Machining The surface of square ring band and the surface of lower fillet annulus；Step 3, technological parameter is determined；Step 4, in Milling Process circular arc annulus surface：The square shoulder milling cutter of a diameter of 50mm is selected, cutter feed at 60mm below point of penetration from first is herein processing zero point, The depth of cut is 3mm, moves 30mm along the X direction, reaches the first and cuts a little；Lathe is done around platen to be turned counterclockwise It is dynamic, make to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter rotation；Platen Velocity of rotation is 6 degree per minute；Cutter starts machined part；When workpiece turns to point of penetration and cutter on make the workpiece second Edge when overlapping, lathe stops operating, and cutter is moved on second to the negative direction of X-coordinate below point of penetration at 60mm, machine Bed starts to rotate counterclockwise, and when cutter is moved on first 60mm places below point of penetration, returns to processing zero point, completion first time milling It cuts；Cutter is moved on first at point of penetration to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little；Adjust cutter The depth of cut be 3mm；Start lathe, repeat the first time milling process, start second of milling；When workpiece turns to point of penetration and cutter on make the workpiece second, lathe stops operating, and cutter is to the losing side of X-coordinate To being moved on second below point of penetration at 60mm, lathe starts to rotate counterclockwise, when cutter is rotated to point of penetration on first At square 60mm, processing zero point is returned to, completes second of milling；Cutter described in circulating repetition is mobile and milling process, until the square shoulder milling cutter edge of a diameter of 50mm completely with upper intersecting lens Place's fitting, process finishing；When square shoulder milling cutter edge is bonded completely at upper intersecting lens, after completing last time milling, cutter returns to processing zero point, complete The Milling Process on the surface of upper circular arc annulus in pairs；Step 5, fillet annulus in Milling Process：It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts the table of blank thin wall cylinder section Face below point of penetration at 60mm along X positive direction feeds, cutter rotating speed is 120r/min from first, and the amount of feeding of milling is 60mm/min, cutter is constantly mobile until cutter edge is bonded with upper reinforcing rib lower plane 1；Lathe table top starts to rotate counterclockwise, and cutter is around part milling, and the amount of feeding of milling is 30mm/min, when workpiece rotates When point of penetration is overlapped with the edge of cutter on to make the workpiece second, lathe stops operating, and cutter is moved to the negative direction of X-coordinate It moves to 60mm below point of penetration on second, lathe starts to rotate counterclockwise, when cutter is rotated to point of penetration on first At 60mm, cutter exits completely returns to processing zero point, so far completes the processing of upper fillet annulus；Step 6, part turns around clamping；Step 7, circular arc annulus under Milling Process：Selecting the square shoulder milling cutter of a diameter of 50mm, cutter is processing zero point herein from 60mm place's feeds below point of penetration on the 4th, The depth of cut is 3mm, moves 30mm along the X direction, reaches the first and cuts a little；Lathe is done around platen to be turned counterclockwise It is dynamic, make to produce relative rotation between the workpiece and cutter that are mounted on platen, while cutter rotation；Platen Velocity of rotation is 6 degree per minute；Cutter starts machined part；When workpiece turns to point of penetration and cutter on make the workpiece the 3rd Edge when overlapping, lathe stops operating, and cutter is moved on the 3rd to the negative direction of X-coordinate below point of penetration at 60mm, machine Bed starts to rotate counterclockwise, and when cutter is moved on the 3rd 60mm places below point of penetration, returns to processing zero point, completion first time milling It cuts；Cutter is moved on the 4th at point of penetration to the positive direction of X-coordinate at the 60mm of top, is reached second and is cut a little.Adjust cutter The depth of cut be 3mm；Start lathe, repeat the first time milling process, start second of milling.Make when workpiece turns to When point of penetration is with cutter on the 3rd of the workpiece, lathe stops operating, and cutter is moved on second to the negative direction of X-coordinate and cuts Point lower section 60mm place, lathe starts to rotate counterclockwise, when cutter rotate on the 4th point of penetration lower section 60mm at, return to processing zero Point completes second of milling；Cutter movement and milling process described in circulating repetition, until the square shoulder milling cutter edge of a diameter of 50mm is bonded completely with place, Process finishing；When square shoulder milling cutter edge on second at point of penetration completely with being bonded, after completing last time milling, cutter returns to processing zero Point completes the Milling Process on the surface to lower circular arc annulus；Step 8, fillet annulus under Milling Process：It keeps above-mentioned clamping state constant, changes diameter 60mm corn rose cutters, tool base againsts the table of blank thin wall cylinder section Face from first below point of penetration at 60mm along X positive direction feeds, cutter rotating speed 120r/min, the amount of feeding of milling is 60mm/min, cutter is constantly mobile until cutter edge is bonded with plane on lower reinforcing rib；Lathe table top starts to rotate counterclockwise, For cutter around part milling, the amount of feeding of milling is 30mm/min, when workpiece turn on make the workpiece the 3rd point of penetration with When the edge of cutter overlaps, lathe stops operating, and cutter is moved on the 3rd 60mm below point of penetration to the negative direction of X-coordinate Place, lathe start to rotate counterclockwise, and when cutter is rotated to 60mm below point of penetration on the 4th, cutter exits completely returns to processing Zero point so far completes the processing of lower fillet annulus；So far, whole processing of part abnormal shape circular arc outer mold surface are completed.
- 2. ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method as described in claim 1, which is characterized in that on definite technique road During line, the machined surface of ring-shaped piece is divided into upper circular arc annulus, lower circular arc annulus, upper fillet annulus and lower fillet annulus；It is described Upper fillet annulus is the lower surface of reinforcing rib and an excessive fillet of circle of upper circular arc annulus diameter；The radius ratio base of upper circular arc annulus The big 1mm of radius of part thin wall cylinder section；Lower fillet annulus is the lower surface of reinforcing rib and a circle excessively circle of lower circular arc annulus diameter Angle；The big 1mm of radius of the radius ratio blank thin wall cylinder section of lower circular arc bad band；The surface of upper circular arc annulus and the table of upper fillet annulus Face the tangent forms intersecting lens；The surface of lower circular arc annulus at the plane tangent of lower fillet annulus with forming lower intersecting lens；On The surface of circular arc annulus and upper thickening arc block are tangent by circular arc, and point of contact is point of penetration on first；The surface of lower circular arc annulus with Upper thickening arc block is tangent by circular arc, and point of contact is point of penetration on second；The surface of lower fillet annulus passes through circle with lower thickening arc block Arc is tangent, and point of contact is point of penetration on the 3rd；The surface of lower circular arc annulus and lower thickening arc block are tangent by circular arc, and point of contact is the 4th Upper point of penetration.
- 3. ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method as described in claim 1, which is characterized in that identified technique Parameter is：In circular arc annulus on using Φ 50mm square shoulder milling cutter Milling Machinings and lower circular arc annulus, the rotating speed of milling machine spindle is 400rmp/min, the amount of feeding of milling is 110mm/min, cutting depth 3mm；With diameter 60mm corn rose cutter Milling Machinings When upper fillet annulus and lower fillet annulus, the rotating speed of milling machine spindle is 120rmp/min, and the amount of feeding of milling is 30mm/min, is cut Cut depth 31.5mm.
- 4. ring-shaped piece abnormal shape circular arc outer mold surface numerical control milling method as described in claim 1, which is characterized in that add in each milling In work Xun Huan, the moving direction of cutter is X-direction, and moving step length is 30 millimeters.
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