CN108544041A - Inner screw thread milling processing method - Google Patents
Inner screw thread milling processing method Download PDFInfo
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- CN108544041A CN108544041A CN201810728211.5A CN201810728211A CN108544041A CN 108544041 A CN108544041 A CN 108544041A CN 201810728211 A CN201810728211 A CN 201810728211A CN 108544041 A CN108544041 A CN 108544041A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/32—Thread cutting; Automatic machines specially designed therefor by milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
Abstract
The embodiment of the invention discloses a kind of inner screw thread milling processing methods, are used for multiaxis such as three axis numerically controlled machine machining internal thread, and the inner screw thread milling processing method includes：Turntable is installed on the three axis numerically controlled machine；The setting angle head on the main shaft of the three axis numerically controlled machine adjusts the axis of the axis of the angle head and the main shaft into default angle of oscillation according to the type of the internal thread and locks the angle head；Clamping workpiece to be processed simultaneously makes the axis of the bottom outlet on the workpiece to be processed be overlapped with the axis of the turntable；Screw cutter is installed on the angle head；The turntable uniform rotation is controlled, and starts main shaft；It controls the screw cutter and the internal thread is processed on the bottom outlet according to default feed path with default feed speed.Inner screw thread milling processing method provided in an embodiment of the present invention can promote the machining accuracy of internal thread, thread surface finish, reduce the processing cost of internal thread, and economic benefit is apparent.
Description
Technical field
The present invention relates to Computerized Numerical Control processing technology field more particularly to a kind of inner screw thread milling processing methods.
Background technology
Traditional screw thread process mode has：Turning, tapping etc..But there is accuracy of screw machining not in these processing methods
Height, the disadvantage of thread surface finish difference.In addition, turnery processing is there is also chip breaking is not easy, chip easily winds cutter, or stays in spiral shell
Problem in pit, and this can all make the processing quality of threaded hole have a greatly reduced quality, while the abrasion of cutter is also exacerbated, especially
Turnery processing is not suitable for the processing of asymmetric class part and heavy parts.And there is also screw tap easy fracture, processing for tapping processing
The shortcomings of efficiency is low, cutting force is big, and be not suitable for processing difficult-to-machine material.At present for form of thread angular bisector perpendicular to
The processing of cone generatrices type tapered tread is still based on turning.In addition, part of the manufacturer is using in five-axle number control machine tool Milling Process
Screw thread, the shortcomings that can be very good to overcome traditional diamond-making technique, thread milling processing has high precision machining, thread surface bright and clean
It spends, is not limited by thread rotary orientation and size, process the advantages that versatility is good, and cutting force is small, and cutter life is long, but use five axis
The cost of numerically-controlled machine tool Milling Process screw thread is very high.
Invention content
In view of the above-mentioned problems, the embodiment of the present invention provides a kind of inner screw thread milling processing method, to improve internal thread
Processing quality reduces processing cost.
Specifically, the embodiment of the present invention provides a kind of inner screw thread milling processing method, in three axis numerically controlled machine processing
Screw thread, the inner screw thread milling processing method include：Turntable is installed on the three axis numerically controlled machine；In the three-axis numerical control machine
Setting angle head on the main shaft of bed, the axis of the axis and the main shaft of the angle head is adjusted according to the type of the internal thread
At default angle of oscillation and lock the angle head, wherein when the internal thread type be tooth form angular bisector perpendicular to cone
The taper half-angle of the default angle of oscillation θ and the internal thread when conical inner screw thread of busbarIt is equal, when the internal thread
Type is tooth form angular bisector perpendicular to the conical inner screw thread of the axis of thread or when being cylindrical internal thread, the default angle of oscillation
θ is zero；Clamping workpiece to be processed and make bottom outlet on the workpiece to be processed axis and the turntable axis weight
It closes；Screw cutter is installed on the angle head；The turntable uniform rotation is controlled, and starts main shaft；Control the thread milling machine
Knife processes the internal thread according to default feed path with default feed speed on the bottom outlet.
On the other hand, the embodiment of the present invention also provides a kind of inner screw thread milling processing method, in gang tool processing
Screw thread, the gang tool include main shaft and are equipped with turntable, which is characterized in that the inner screw thread milling processing method includes：
The axis of the setting angle head on the main shaft, the axis for adjusting the angle head and the main shaft at default angle of oscillation and locks
The angle head；Clamping workpiece to be processed and make bottom outlet on the workpiece to be processed axis and the turntable axis
Line overlaps；Screw cutter is installed on the angle head；The turntable uniform rotation is controlled, and starts main shaft；Control the spiral shell
Line milling cutter processes the internal thread according to default feed path with default feed speed on the bottom outlet.
In an embodiment of the invention, the internal thread is conical inner screw thread, the feed on the default feed path
The coordinate of point L meets：
Wherein, XLFor the X axis coordinate of the feed point L, YLFor the Y axis coordinate of the feed point L, ZLFor the feed point L
Z axis coordinate, D be the internal thread large end face datum diameter, a be the feed point L to the internal thread large end face away from
From,For the taper half-angle of the internal thread；
The coordinate of withdrawing point M on the default feed path meets：
Wherein, XMFor the X axis coordinate of the withdrawing point M, YMFor the Y axis coordinate of the withdrawing point M, ZMFor the withdrawing point M
Z axis coordinate, H be the internal thread the depth of thread.
In an embodiment of the invention, the internal thread is tooth form angular bisector spiral shell in the circular cone of cone generatrices
Line, the taper half-angle of the default angle of oscillation θ and the internal threadIt is equal.
In an embodiment of the invention, the internal thread is tooth form angular bisector spiral shell in the circular cone of the axis of thread
Line, the default angle of oscillation θ is zero.
In an embodiment of the invention, the internal thread is cylindrical internal thread, and the default angle of oscillation θ is zero, described
The coordinate of feed point L on default feed path meets：
Wherein, XLFor the X axis coordinate of the feed point L, YLFor the Y axis coordinate of the feed point L, ZLFor the feed point L
Z axis coordinate, D be the internal thread nominal diameter, a be the feed point L to the internal thread end face distance；
The coordinate of withdrawing point M on the default feed path meets：
Wherein, XMFor the X axis coordinate of the withdrawing point M, YMFor the Y axis coordinate of the withdrawing point M, ZMFor the withdrawing point M
Z axis coordinate, H be the internal thread the depth of thread.
In an embodiment of the invention, the velocity of rotation n of the turntable and default feed speed f meets：
Wherein, p is the screw pitch of the internal thread.
In an embodiment of the invention, the inner screw thread milling processing method further includes：The screw cutter is controlled to press
The lathe zero of the gang tool is retracted according to default withdrawing path, wherein the default withdrawing path includes from the edges withdrawing point M
Radial direction retreats at the axis of the internal thread, retreats to the internal thread in the axial direction from the axis of the internal thread
On the outside of end face, then retreat to the lathe zero of the gang tool.
Another aspect, the embodiment of the present invention also provide a kind of inner screw thread milling processing method, are applied to multi-axis NC Machine Tools,
Including step：Control turntable uniform rotation simultaneously starts main shaft, wherein clamping has workpiece to be processed and described to be added on the turntable
The axis of bottom outlet on work workpiece is overlapped with the axis of the turntable, and screw cutter is equipped with by angle head on the main shaft,
The axis of the angle head and the main shaft axis is at default angle of oscillation θ and the default angle of oscillation θ on the bottom outlet by being intended to
The type for processing the internal thread formed determines；The screw cutter is controlled to preset feed speed according to default feed path in institute
It states and processes the internal thread on bottom outlet, wherein the default feed path includes the straight line path from feed point L to withdrawing point M
Diameter；And the control screw cutter is retracted into the lathe zero of the gang tool according to default withdrawing path, wherein described
Default withdrawing path includes from radially retreating to the axis of the internal thread from the withdrawing point M, from the internal thread
It is retreated in the axial direction at axis on the outside of the end face of the internal thread, then retreats to the lathe zero of the gang tool.
In an embodiment of the invention, the response user's operation and the screw cutter is controlled with default feeding speed
It spends according to default feed path and includes the step of processing the internal thread on the bottom outlet：Obtain the screw thread of the internal thread
The distance a, depth of thread H and taper half-angle of diameter D, screw pitch p, feed point L to the screw thread end faceAccording to described
The screw pitch p of internal thread and the rotating speed n of the turntable calculate the default feed speed f, wherein the default feed speed f is full
Foot：Judge the taper half-angleWhether it is zero, when the taper half-angleFor non-zero when according to the first formula
Collection calculates the feed point L and the coordinate for falling back on point M with the determination default feed path, when the taper half-angleFor
The feed point L and the coordinate for falling back on point M are calculated when zero in a second manner with the determination default feed path；And control
It makes the screw cutter and the internal thread is processed according to default feed path with default feed speed.
Above-mentioned technical proposal can have the following advantages that：The embodiment of the present invention on three axis or four-shaft numerically controlled lathe by matching
Turntable and angle head are set, is then swung according to the type of internal thread to be processed and the corresponding angle head of relative parameters setting are default
Angle θ, and with turntable cooperation according to the processing of default feed path completion internal thread.Inner screw thread milling provided in an embodiment of the present invention
Processing method can promote the machining accuracy of internal thread, thread surface finish, reduce the processing cost of internal thread, and economic benefit is bright
It is aobvious.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of flow diagram of inner screw thread milling processing method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of gang tool of the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of turntable of the embodiment of the present invention；
Fig. 4 a and Fig. 4 b are respectively a kind of front view of angle head of the embodiment of the present invention and the axis surveys view of angle head；
Fig. 5 a and Fig. 5 b are the tooth form schematic diagram of two kinds of conical inner screw threads of the embodiment of the present invention, and wherein Fig. 5 a are thread form angle
For bisector perpendicular to the conical inner screw thread of cone generatrices, Fig. 5 b are conical inner screw thread of the tooth form angular bisector perpendicular to axis；
Fig. 6 a, Fig. 6 b are the bottom hole structure schematic diagram on the workpiece to be processed of the embodiment of the present invention, wherein the bottom in Fig. 6 a
Hole is the bottom outlet of conical inner screw thread, and the bottom outlet in Fig. 6 b is the bottom outlet of cylindrical internal thread；
Fig. 7 a, Fig. 7 b and Fig. 7 c are respectively the tooth form angular bisector of the embodiment of the present invention in the circular cone of cone generatrices
Screw thread, tooth form angular bisector are perpendicular to the conical inner screw thread of the axis of thread and the machining sketch chart of cylindrical thread；
Fig. 8 is the flow diagram of another inner screw thread milling processing method provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment belongs to the range that the present invention protects.
Referring to Fig. 1, Fig. 2 and Fig. 3, wherein Fig. 1 is a kind of inner screw thread milling processing method provided in an embodiment of the present invention
Flow diagram, Fig. 2 is a kind of structural schematic diagram of gang tool of the embodiment of the present invention and Fig. 3 is the embodiment of the present invention
A kind of turntable structural schematic diagram.Inner screw thread milling processing method provided in an embodiment of the present invention is processed suitable for gang tool
Internal thread.Gang tool 1 herein may be, for example, three axis (X-Y-Z) numerically-controlled machine tool (referring to Fig. 2) but need to be in the work of gang tool 1
Make an additionally mounted turntable 2 (referring to Fig. 3) on platform 11, such as to carry four axis (X-Y-Z-C) lathe of turntable 2.Turn
Platform 2 may be, for example, numerical control rotating platform.The numerical control rotating platform connect with gang tool 1 and is carried out by servo-drive system (not shown)
Control.Turntable 2 can link with three axis (X-Y-Z) of gang tool 1.It can clamping workpiece to be processed 3 on turntable 2.Workpiece to be processed 3
Can be symmetrical slewing parts and miniature parts, or asymmetric class part and heavy parts.It is to be added before processing screw thread
Bottom outlet 31 has been processed on work workpiece 3 in advance (referring to Fig. 6 a).Inner screw thread milling processing method provided in an embodiment of the present invention is
It is the machining internal thread on 31 inner wall of bottom outlet.In addition, being provided with main shaft 12 on gang tool 1.
Specifically, it please refers to Fig.1 to Fig. 7, inner screw thread milling processing method provided in an embodiment of the present invention includes：
Step S11, the setting angle head 13 on main shaft 12 adjust the angle the axis of head 13 and the axis of main shaft 12 at default
After angle of oscillation θ, lock angle head 13 (referring to Fig. 4 a and Fig. 4 b).Specifically, the axis of main shaft 12 and the axis of turntable 2 are flat
Row.The value of default angle of oscillation θ is determined according to the thread type of for example described internal thread of parameter of the internal thread.The interior spiral shell
Line includes conical inner screw thread and cylindrical internal thread.Conical inner screw thread includes tooth form angular bisector in the circular cone of cone generatrices
The conical inner screw thread of screw thread (referring to Fig. 5 a) and tooth form angular bisector perpendicular to axis (referring to Fig. 5 b).
As shown in Figure 5 a, when the internal thread be tooth form angular bisector perpendicular to the conical inner screw thread of cone generatrices when, angle
The default angle of oscillation θ for spending head 13 meets：
Wherein, taper half-angleFor the angle between the cone generatrices and the axis of the internal thread hole of the internal thread.
As shown in Figure 5 b, when the internal thread be tooth form angular bisector perpendicular to the conical inner screw thread of the axis of thread when, angle
The default angle of oscillation θ for spending head 13 is zero, i.e., the axis of angle head 13 is overlapped with the axis of main shaft 12.
When the internal thread is cylindrical thread, tooth form angular bisector is also perpendicularly to the axis of the internal thread, therefore,
The default angle of oscillation θ of angle head 13 is zero, i.e., the axis of angle head 13 is overlapped with the axis of main shaft 12.
Step S13, clamping workpiece to be processed 3 and the axis and turntable 2 for making the bottom outlet 31 on workpiece to be processed 3
Axis overlaps.Specifically, by workpiece to be processed 3 clamping to turntable 2, and the position of workpiece to be processed 3 is adjusted so as to be added
The axis of bottom outlet 31 on work workpiece 3 is overlapped with the axis of turntable 2.As shown in Figure 6 a, when the internal thread is tapered tread example
When such as form of thread angular bisector perpendicular to the tapered tread of cone generatrices type, bottom outlet 31 is conical bore.As shown in Figure 6 b, work as institute
State internal thread be cylindrical thread when, bottom outlet 31 be circular hole.
Step S15 installs screw cutter 14 on angle head 13.Certainly, it after installing screw cutter 14, needs to complete
It works knife.
Step S17, uniform rotation turntable 2 start main shaft 12.
Step S19, control screw cutter 14 are processed with default feed speed f, according to default feed path on bottom outlet 31
Go out the internal thread.Control screw cutter 14 herein moves, it is possible to understand that workpiece to be processed 3 is relative to screw cutter in order to control
14 do relative motion.Default feed speed f meets：
Wherein, p is the screw pitch of the internal thread, and n is the velocity of rotation of turntable 2.
The default feed path can for example include the path of point L and from feed point L to withdrawing from lathe zero to feed
The path of point M.
Lathe zero is the machine origin as defined in Machine Manufacture quotient, is the origin of lathe coordinate system.Lathe zero is not only
It is the datum mark established the datum mark of workpiece coordinate system on lathe, but also be lathe debugging and part processing.
From lathe zero to feed, the path of point L may be, for example, straight line path, naturally it is also possible to be that curved path etc. is other
Form path.
It is straight line path from feed point L to the typical one of withdrawing point M.The coordinate of feed point L and withdrawing point M are because to be added
The type of the internal thread and the difference of parameter of work and it is different.Usually using the center O of 31 upper surface of bottom outlet as programming coordinates original
Point (referring to Fig. 7 a, Fig. 7 b, Fig. 7 c).It is of course also possible to use other point be used as programming coordinates origin, the present invention not as
Limit.
As shown in Figure 7a, when the internal thread be tooth form angular bisector perpendicular to the conical inner screw thread of cone generatrices when, angle
Spend the default angle of oscillation θ and taper half-angle of head 13It is equal, therefore, the axis of the axis of screw cutter 14 and the internal thread
Angle between (namely Z axis) is equal toPath from feed point L to withdrawing point M is parallel with the axis direction of screw cutter 14
(as shown in Figure 7a), it is also parallel with the cone generatrices of the internal thread in XOZ planes.
The coordinate of feed point L meets：
Wherein, XLFor the X axis coordinate of the feed point L, YLFor the Y axis coordinate of the feed point L, ZLFor the feed point L
Z axis coordinate, D be the internal thread datum diameter (the basic major diameter of the large end face of the internal thread), a be feed point L arrive
Large end face (also referred to as datum plane) distance of the internal thread.
The coordinate of withdrawing point M meets：
Wherein, XMFor the X axis coordinate of the withdrawing point M, YMFor the Y axis coordinate of the withdrawing point M, ZMFor the withdrawing point M
Z axis coordinate, H be the internal thread the depth of thread.
As shown in Figure 7b, when the internal thread be tooth form angular bisector perpendicular to the conical inner screw thread of the axis of thread when, angle
The default angle of oscillation θ for spending head 13 is zero, therefore the axis of screw cutter 14 is parallel with axis (namely the Z axis) of the internal thread.
Path from feed point L to withdrawing point M is parallel with the cone generatrices of the internal thread in XOZ planes.The coordinate of feed point L meets
The coordinate of formula (3), withdrawing point M meets formula (4).
As shown in Figure 7 c, when the internal thread is cylindrical internal thread, the default angle of oscillation θ of angle head 13 is zero, therefore
The axis of screw cutter 14 is parallel with axis (namely the Z axis) of the internal thread.From feed point L to the path of withdrawing point M and spiral shell
The axis direction of line milling cutter 14 is parallel.
The coordinate of feed point L meets：
Wherein, D is the nominal diameter of the internal thread, and a is end face distances of the feed point L to the internal thread.
The coordinate of withdrawing point M meets：
Wherein, H is the depth of thread of the internal thread.
Control screw cutter 14 first is moved to feed point L from the lathe zero, then controls screw cutter 14 with pre-
If feed speed f processes the internal thread according to from feed point L to the path of withdrawing point M on bottom outlet 31.
Certainly, a kind of inner screw thread milling processing method provided in this embodiment further includes withdrawing step.Specifically, described to move back
Knife step includes that control screw cutter 14 retracts the lathe zero according to default withdrawing path.The default withdrawing path can example
From the axis of internal thread as described in including radially to retreat to from withdrawing point M, from the axis of the internal thread along axis side
The lathe zero is retreated on the outside of the end face of the internal thread and retreated to (the Z axis positive direction in Fig. 7 a, Fig. 7 b, Fig. 7 c).
Herein, it is motionless that screw cutter is can be understood as from the axis that withdrawing point M radially retreats to the internal thread, but it is to be added
Work workpiece opposite thread milling cutter moves；It is retreated in the axial direction from the axis of the internal thread on the outside of the end face of the internal thread
Screw cutter be can be understood as main shaft is moved along the axis direction of the internal thread, and workpiece to be processed is motionless；Retreat to institute
The lathe zero of gang tool is stated it can be appreciated that screw cutter is motionless, but workpiece to be processed opposite thread milling cutter moves.
It is of course also possible to for that can realize other control modes of identical function.
Herein it is noted that the default feed path and the default withdrawing path can be by manually planning
It arrives, can also be obtained by CAD/CAM software plans.In addition, gang tool is typically multi-shaft interlocked numerically-controlled machine tool, own
Processing action pass through nc program control complete.In addition, the default feed path and the default withdrawing path
Planning need to consider screw cutter 14 tool radius and the internal thread thread height.Furthermore the default feed path
Can be single process path with the default withdrawing path, or multiple machining path, this can be according to specific screw thread
Parameter and processing conditions determine.
For ease of more fully understanding the embodiment of the present invention, the PZ39 for being 40mm below by one depth of thread H of processing
The inner screw thread milling processing method that dextrorotation tapered tread citing the present invention will be described in detail embodiment provides.
PZ39 screw threads are conical inner screw thread of the tooth form angular bisector perpendicular to cone generatrices, and the screw thread on datum plane is big
Diameter D=39mm, middle warp are 37.643mm, path 36.286mm, pitch P=2mm, taper half-anglePZ39 screw threads
Milling method include：
1) installation fixes turntable on the workbench of three axis numerically controlled machine.
2) the setting angle head on main shaft adjusts the angle the axis of head and the axis of main shaft into default angle of oscillationAngle after, lock angle head.
3) clamping workpiece to be processed and the axis of bottom outlet on the workpiece to be processed is overlapped with the axis of turntable.
4) screw cutter is installed on angle head.
5) uniform rotation numerical control rotating platform starts main shaft.Numerical control rotating platform is rotated counterclockwise with the rotating speed of n=60r/min.Main shaft
Rotating speed is 600~700r/min.
6) the feed speed f of screw cutter is：
7) take feed point L to the distance a=5mm of the datum plane of the internal thread.Feed point L coordinate value is：
I.e. the coordinate of feed point L is (19.800,0,5).
Withdrawing point M coordinate values are：
YM=0
ZM=-H=-40
I.e. the coordinate of withdrawing point M is (17.103,0, -40).
Control screw cutter with feed speed f=2.5mm/s, according to default feed path from the feed of lathe zero to feed
Point L (19.800,0,5), then from L (19.800,0,5) the straight line feed of feed point to withdrawing point M (17.103,0, -40) in bottom outlet
On process PZ39 internal threads.
8) from withdrawing point M (17.103,0, -40), radially withdrawing is extremely according to default withdrawing path for control screw cutter
Point (0,0, -40) at PZ39 internal thread axis, then from point (0,0, -40) along PZ39 internal threads axis direction (Z is positive) withdrawing
Point (0,0,100) on the outside of to the end face of PZ39 internal threads is finally retracted into lathe zero to complete the milling of PZ39 internal threads again
Cut process.
In conclusion the embodiment of the present invention, by configuring turntable and angle head on multi-axis NC Machine Tools, then basis waits for
The corresponding angle head of type and relative parameters setting of machining internal thread presets angle of oscillation θ, and with turntable cooperation according to default
Complete the processing of internal thread in feed path.Inner screw thread milling processing method provided in an embodiment of the present invention can also promote internal thread
Processing quality is such as machining accuracy, thread surface finish.In addition, with the method using five-axis machine tool Milling Process internal thread
It compares, inner screw thread milling processing method provided in an embodiment of the present invention significantly reduces the processing cost of internal thread, economy effect
It is beneficial apparent.Furthermore inner screw thread milling processing method provided in an embodiment of the present invention can not only process symmetry classes part and small-sized zero
Cylindrical internal thread on part and conical inner screw thread, and can process the cylindrical internal thread on asymmetric class part and heavy parts and
Conical inner screw thread, the range of work are wide.
In addition, the embodiment of the present invention also provides another inner screw thread milling processing method.The inner screw thread milling processing side
Method is suitable for gang tool.The gang tool is provided with controller and is equipped with numerical control corresponding with controller system
System.The gang tool can calculate according to user's operation and according to relevant parameter input by user and preset feed speed and preset
Feed path etc., and inner screw thread milling processing is completed according to the default feed speed and the default feed path.Such one
To simplify internal thread machining operation while promoting internal thread machining quality, promote processing efficiency.As shown in figure 8, described
The step of inner screw thread milling processing method includes：
1) it controls turntable uniform rotation and starts main shaft.The gang tool for example such as triggers behaviour by responding user's operation
Make the uniform rotation of button control turntable and starts main shaft.Wherein, on the turntable on the gang tool clamping have workpiece to be processed,
And the axis of the bottom outlet on the workpiece to be processed is overlapped with the axis of the turntable, is equipped with by angle head on the main shaft
Screw cutter, the axis of the angle head and the main shaft axis is at default angle of oscillation θ and the default angle of oscillation θ is by institute
The type for stating the internal thread of formation to be processed on bottom outlet determines.
2) it controls the screw cutter and institute is processed on the bottom outlet according to default feed path with default feed speed
State internal thread.The default feed path includes the straight line path from feed point L to withdrawing point M.Specifically, the multiaxis described first
Lathe for example inputs the diameter of thread D, screw pitch p, feed that operation obtains for example described internal thread of relevant parameter by responding user
Point L to internal thread end face distance a, depth of thread H and taper half-angleDeng.Then, according to the screw pitch p of the internal thread and
The rotating speed n of the turntable is calculated according to formula (2) and is preset feed speed f.Furthermore judge taper half-angleWhether it is zero, works as cone
Spend half-angleFor non-zero when, indicate the internal thread be conical inner screw thread, diameter of thread D be the internal thread large end face benchmark
The distance a of diameter, feed point L to internal thread end face is distances of the feed point L to the large end face of the internal thread, then with first party
Formula for example calculates feed point L according to formula (3) and formula (4) and falls back on the coordinate of point M with the determination default feed path；When
Taper half-angleIt is zero, indicates that the internal thread is cylindrical internal thread, diameter of thread D is the nominal diameter of the internal thread, into
Knife point L to internal thread end face distance a be feed point L to the end face of the internal thread distance, then in a second manner for example by
Feed point L is calculated according to formula (5) and formula (6) and falls back on the coordinate of point M with the determination default feed path.Finally, it controls
The screw cutter processes the internal thread with default feed speed according to default feed path.
3) control screw cutter is retracted into the lathe zero of the gang tool according to default withdrawing path, wherein described pre-
If withdrawing path includes from radially retreating to the axis of the internal thread from withdrawing point M, from the axis of the internal thread
It retreats in the axial direction on the outside of the end face of the internal thread, then retreats to the lathe zero of the gang tool.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of inner screw thread milling processing method is used for three axis numerically controlled machine machining internal thread, which is characterized in that the internal thread
Milling method includes：
Turntable is installed on the three axis numerically controlled machine；
The setting angle head on the main shaft of the three axis numerically controlled machine adjusts the angle head according to the type of the internal thread
The axis of axis and the main shaft at default angle of oscillation and locks the angle head, wherein when the type of the internal thread is tooth
The taper half-angle of the default angle of oscillation θ and the internal thread when type angular bisector is perpendicular to the conical inner screw thread of cone generatrices
It is equal, when the type of the internal thread is tooth form angular bisector perpendicular to the conical inner screw thread of the axis of thread or is spiral shell in cylinder
When line, the default angle of oscillation θ is zero；
Clamping workpiece to be processed simultaneously makes the axis of the bottom outlet on the workpiece to be processed be overlapped with the axis of the turntable；
Screw cutter is installed on the angle head；
The turntable uniform rotation is controlled, and starts main shaft；
It controls the screw cutter and the interior spiral shell is processed on the bottom outlet according to default feed path with default feed speed
Line.
2. a kind of inner screw thread milling processing method is used for gang tool machining internal thread, the gang tool includes main shaft and peace
Equipped with turntable, which is characterized in that the inner screw thread milling processing method includes：
The setting angle head on the main shaft, the axis of the axis for adjusting the angle head and the main shaft at default angle of oscillation simultaneously
Lock the angle head；
Clamping workpiece to be processed simultaneously makes the axis of the bottom outlet on the workpiece to be processed be overlapped with the axis of the turntable；
Screw cutter is installed on the angle head；
The turntable uniform rotation is controlled, and starts main shaft；
It controls the screw cutter and the interior spiral shell is processed on the bottom outlet according to default feed path with default feed speed
Line.
3. inner screw thread milling processing method as claimed in claim 2, which is characterized in that the internal thread is conical inner screw thread,
The coordinate of feed point L on the default feed path meets：
Wherein, XLFor the X axis coordinate of the feed point L, YLFor the Y axis coordinate of the feed point L, ZLFor the Z of the feed point L
Axial coordinate, D are the datum diameter of the internal thread large end face, and a is large end face distances of the feed point L to the internal thread,For the taper half-angle of the internal thread；
The coordinate of withdrawing point M on the default feed path meets：
Wherein, XMFor the X axis coordinate of the withdrawing point M, YMFor the Y axis coordinate of the withdrawing point M, ZMFor the Z of the withdrawing point M
Axial coordinate, H are the depth of thread of the internal thread.
4. inner screw thread milling processing method as claimed in claim 3, which is characterized in that the internal thread is tooth form angular bisector
Perpendicular to the conical inner screw thread of cone generatrices, the taper half-angle of the default angle of oscillation θ and the internal threadIt is equal.
5. inner screw thread milling processing method as claimed in claim 3, which is characterized in that the internal thread is tooth form angular bisector
Perpendicular to the conical inner screw thread of the axis of thread, the default angle of oscillation θ is zero.
6. inner screw thread milling processing method as claimed in claim 2, which is characterized in that the internal thread is cylindrical internal thread,
The default angle of oscillation θ is zero, and the coordinate of the feed point L on the default feed path meets：
Wherein, XLFor the X axis coordinate of the feed point L, YLFor the Y axis coordinate of the feed point L, ZLFor the Z of the feed point L
Axial coordinate, D are the nominal diameter of the internal thread, and a is end face distances of the feed point L to the internal thread；
The coordinate of withdrawing point M on the default feed path meets：
Wherein, XMFor the X axis coordinate of the withdrawing point M, YMFor the Y axis coordinate of the withdrawing point M, ZMFor the Z of the withdrawing point M
Axial coordinate, H are the depth of thread of the internal thread.
7. inner screw thread milling processing method as claimed in claim 2, which is characterized in that the velocity of rotation n of the turntable and institute
Default feed speed f is stated to meet：
Wherein, p is the screw pitch of the internal thread.
8. inner screw thread milling processing method as claimed in claim 2, which is characterized in that further include：
The lathe zero that the screw cutter retracts the gang tool according to default withdrawing path is controlled, wherein described preset is moved back
Cutter track diameter includes from radially retreating to the axis of the internal thread from withdrawing point M, from the axis of the internal thread along axis
Line direction retreats on the outside of the end face of the internal thread, then retreats to the lathe zero of the gang tool.
9. a kind of inner screw thread milling processing method is applied to multi-axis NC Machine Tools, which is characterized in that including step：
Control turntable uniform rotation simultaneously starts main shaft, wherein clamping has workpiece to be processed and the work to be processed on the turntable
The axis of bottom outlet on part is overlapped with the axis of the turntable, and screw cutter is equipped with by angle head on the main shaft, described
The axis of angle head and the main shaft axis is at default angle of oscillation θ and the default angle of oscillation θ on the bottom outlet by being intended to process
The type of the internal thread of formation determines；
It controls the screw cutter and the interior spiral shell is processed on the bottom outlet according to default feed path with default feed speed
Line, wherein the default feed path includes the straight line path from feed point L to withdrawing point M；And the control screw cutter
The lathe zero of the gang tool is retracted into according to default withdrawing path, wherein the default withdrawing path includes being moved back from described
Knife point M radially retreats at the axis of the internal thread, it is described to be retreated in the axial direction from the axis of the internal thread
On the outside of the end face of internal thread, then retreat to the lathe zero of the gang tool.
10. inner screw thread milling processing method as claimed in claim 9, which is characterized in that the control screw cutter with
Preset feed speed includes the step of processing the internal thread on the bottom outlet according to default feed path：
It is deep to the distance a of the internal thread end face, screw thread to obtain the diameter of thread D, screw pitch p, feed point L of the internal thread
Spend H and taper half-angle
The default feed speed f is calculated according to the rotating speed n of the screw pitch p of the internal thread and the turntable, wherein described default
Feed speed f meets：
Judge the taper half-angleWhether it is zero, when the taper half-angleTo calculate the feed in the first way when non-zero
Point L and the coordinate for falling back on point M are with the determination default feed path, when the taper half-angleWhen being zero in a second manner
The feed point L and the coordinate for falling back on point M are calculated with the determination default feed path；And the control screw cutter
With default feed speed the internal thread is processed according to default feed path.
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| CN112247291A (en) * | 2020-10-17 | 2021-01-22 | 张喜清 | Hexagonal nut tapping device |
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| CN114309828A (en) * | 2022-03-07 | 2022-04-12 | 海安县恒益滑动轴承有限公司 | Device for preparing lubricating oil channel of large-sized screw-down nut |
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