CN104148752A - Method for automatically extracting and removing deviation value in tool setting and grinding of CNC thread mill - Google Patents

Method for automatically extracting and removing deviation value in tool setting and grinding of CNC thread mill Download PDF

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Publication number
CN104148752A
CN104148752A CN201410315013.8A CN201410315013A CN104148752A CN 104148752 A CN104148752 A CN 104148752A CN 201410315013 A CN201410315013 A CN 201410315013A CN 104148752 A CN104148752 A CN 104148752A
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axis
grinding
axle
coordinate position
screw thread
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CN104148752B (en
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胡东红
罗翰
宁雪燕
张玲
王平江
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QUANZHOU-HUST INTELLIGENT MANUFACTURING FUTURE
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Hubei University
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Abstract

The invention provides a method for automatically extracting and removing the deviation value in tool setting of a CNC thread mill. The deviation value is used for removing the tool offsetting phenomenon in grinding of the thread mill. The method mainly includes the steps that a CNC system gives an instruction, and the Z axis of a workbench moving shaft and the A axis of a workpiece rotating shaft of the CNC thread mill are used for trial grinding of threads at a resultant speed v according to the workpiece screw thread lead L; after the resultant speed is stable, the CNC system records the coordinate value of the Z axis and the coordinate value of the A axis automatically, and the synchronization following errors of the Z axis and the A axis are calculated automatically to be used as the deviation value. When the practical resultant speed v is used for grinding workpieces, the deviation value is subtracted from the grinding starting point coordinate value and the grinding terminal point coordinate value of the Z axis, and the tool offsetting phenomenon in the thread mill can be removed. The method is suitable for CNC thread mills, and the tool offsetting phenomenon in the grinding process can be effectively removed after tool setting of the thread mill is conducted. The grinding technology is improved, the grinding precision, grinding efficiency and grinding machining quality are improved, and good economic benefits and social benefits are achieved.

Description

Automatic extraction and the removing method of departure in numerical control screw thread mill tool setting and grinding
Technical field
The invention belongs to screw thread mill grinding field, be specifically related to the elimination of tool setting departure in the automatic extraction of departure in numerical control screw thread mill automatic tool preset and grinding.
Background technology
Threaded screw rod is parts very important in machinery industry, and accuracy of thread requires high, processed complex.General high precision screw leading screw is all processed on numerical control screw thread grinding machine.
one, the basic principle of numerical control screw thread mill
Numerical control screw thread mill motion parts is mainly comprised of X, Z, A, tetra-axis servomotors of Y.Emery wheel moves along X-direction, can approach or away from whorl work piece, and X-axis is as emery wheel advance and retreat cutter direction; When whorl work piece moves along Z-direction, workpiece can also rotate around A axle; Dresser can be moving along y-axis shift, approaches or away from emery wheel, around trimmer rotating shaft rotation half-turn, thereby realize the finishing to emery wheel.As shown in Figure 1, workpiece is rotation positive direction along A direction rotation, and emery wheel is X-axis positive direction away from workpiece, and the relative workpiece of emery wheel is moved to the left as Z axis positive direction.
Grinding principle: Z axis moves the rotation with A axle and links, and Z axis moves a lead L, and A axle must rotating 360 degrees.In Grinding Process, to move with A axle rotation be with its aggregate velocity to Z axis vcarry out grinding.
two, the main working process of numerical control screw thread mill
The main working process of numerical control screw thread mill is divided into tool setting and two processes of grinding.As shown in Figure 2, concrete steps are as follows for tool setting process:
The 1st step, digital control system makes emery wheel be positioned at tool setting original position;
The 2nd step, Z axis and A axle are according to pitch helical pitch lrelation, A axle often revolves and turns around, a pitch of Z axis walking, Z axis and the interlock of A axle, make emery wheel be walked to tool setting end position by tool setting original position;
The 3rd step, operation X-axis handwheel and Z axis handwheel, make emery wheel be positioned in the middle of thread groove, and emery wheel left and right sides spark equal and opposite in direction;
The 4th step, presses " tool setting success button ", and system records current X coordinate, Z coordinate and A coordinate automatically;
The 5th step, the emery wheel home of dropping back, tool setting success, tool setting process finishes.
If when the tool setting end position, do not press " tool setting success button " at grinding wheel movement, system judgement tool setting failure, the emery wheel home of dropping back, system prompt " tool setting failure ", tool setting process finishes.
If tool setting success, when system is pressed according to " tool setting success button ", current X coordinate, Z coordinate and A coordinate that system records, X coordinate position while automatically determining grinding, automatically calculates emery wheel and is positioned at the A coordinate figure of grinding starting point Z coordinate time and the A coordinate figure that emery wheel is positioned at grinding terminal Z coordinate time.
Then, start the grinding process of screw thread mill: system makes grinding wheel movement arrive grinding starting point Z coordinate position, A coordinate position and X coordinate position, Z axis and the interlock of A axle, move to grinding terminal Z coordinate position, A coordinate position, starts grinding, as shown in Figure 3.
In actual Grinding Process, although emery wheel both sides spark equal and opposite in direction during tool setting, in the grinding stage, emery wheel tends to be partial to a little left side or right side, causes emery wheel left side or right side spark bigger than normal.Moreover, the aggregate velocity size when size of grinding stage emery wheel side-play amount and pitch helical pitch size, grinding all has relation.To certain pitch helical pitch land aggregate velocity v, departure remains unchanged.
The bias phenomenon of this numerical control screw thread mill has a great impact crudy in actual Grinding Process.Must try every possible means to eliminate.
Summary of the invention
The object of the invention is to propose automatic extraction and the removing method of departure in a kind of numerical control screw thread mill tool setting and grinding;
Method of the present invention mainly comprises two parts: the one, and the extraction method of numerical control screw thread mill tool setting and grinding departure; The 2nd, in grinding, use this departure to eliminate the offset tool phenomenon in thread grinding, improve quality and the efficiency of thread grinding.
One, the extraction method of departure in numerical control screw thread mill tool setting and grinding, comprises the steps:
The 1st step: leading screw workpiece to be ground is fixed on numerical control screw thread Grinder bench, or does not install, workpiece lead is set is l, during grinding work piece, Z axis and A axle aggregate velocity are v, described aggregate velocity vrefer to that Z axis moves lead lapart from time, the aggregate velocity of A axle rotating 360 degrees simultaneously;
The 2nd step: digital control system is sent instruction, the aggregate velocity while making Z axis and A axle with grinding work piece v, from origin coordinates position P 0( z- 0, a 0) to terminal point coordinate position P 1( z 1, a 1) mobile.P wherein 0( z 0, a 0) and P 1( z 1, a 1) coordinate meets following relation:
(1)
Z axis starts 1 ~ 5 millimeter of displacement, and A axle interlock is followed, and when the aggregate velocity of Z axis and A axle reaches while stablizing, then carries out next step;
The 3rd step: in aggregate velocity vafter stable, system records Z axis real coordinate position automatically z 1, z 2..., z i ..., z n-1 , z n , and A axle real coordinate position a 1, a 2..., a i ..., a n-1 , a n ; When Z axis moves to distance P 1( z 1, a 1) first 5 ~ 1 millimeters, system stops record automatically;
The 4th step: according to the 2nd step P 0( z 0, a 0), P 1( z 1, a 1) the A axle real coordinate position of coordinate figure and the 3rd step record a 1, a 2..., a i ..., a n-1 , a n , calculate the theoretic coordinate position of corresponding Z axis z 1 ', z 2 '..., z i '..., z n-1 ', z n '.Or the 2nd step P 0( z 0, a 0), P 1( z 1, a 1) coordinate figure and the 3rd step record the real coordinate position of Z axis z 1, z 2..., z i ..., z n-1 , z n time, calculate the theoretical coordinate position of A axle a 1 ', a 2 '..., a i '..., a n-1 ', a n '.Computing formula is as follows:
(2a)
(2b)
The 5th step: the mean value Δ that calculates the difference of Z axis theoretical coordinate position and real coordinate position z lv or the mean value Δ of the difference of A axle theoretical coordinate position and real coordinate position a lv .Computing formula is as follows:
(3a)
(3b)
Δ z lv that Z axis and A axle are according to pitch helical pitch l, with stable aggregate velocity vwhen mobile, Z axis theoretical coordinate position and real coordinate position poor.Δ z lv be the Z axis departure in numerical control screw thread mill;
Δ a lv that Z axis and A axle are according to pitch helical pitch l, with stable aggregate velocity vwhen mobile, A axle theoretical coordinate position and real coordinate position poor.Δ a lv be the A axle departure in numerical control screw thread mill;
Δ z lv and Δ a lv all can be for correcting the tool setting bias phenomenon of screw thread mill;
Said process is the extraction method of Z axis in numerical control screw thread mill or A axle departure.
Two, a method of eliminating departure in the grinding of screw thread mill, comprises the steps:
The 1st step: leading screw workpiece to be ground is fixed on numerical control screw thread Grinder bench.Workpiece lead is set is l, during grinding work piece, the synthetic translational speed of Z axis and A axle is v;
The 2nd step: by traditional tool setting process, calculate grinding starting point Z coordinate position z 2corresponding rotating shaft A coordinate figure a 2, calculate grinding terminal Z coordinate position z 3corresponding rotating shaft A coordinate figure a 3;
The 3rd step: make Z axis and A axle with aggregate velocity v, from grinding original position ( z 2+ Δ z lv , a 2), to grinding terminal point coordinate position ( z 3+ Δ z lv , a 3) grinding; Or, make Z axis and A axle with aggregate velocity v, from grinding original position ( z 2, a 2+ Δ a lv ), to grinding terminal point coordinate position ( z 3, a 3+ Δ a lv ) grinding.
Δ wherein z lv for the Z axis departure described in the extraction method of above-mentioned departure;
Δ wherein a lv for the A axle departure described in the extraction method of above-mentioned departure.
principle of the present invention
1, the bias phenomenon of numerical control screw thread mill
Analyze theoretically, during tool setting success, emery wheel is positioned at thread groove center, emery wheel both sides spark equal and opposite in direction.According to tool setting Z axis coordinate position and the A coordinate positions in when success, calculate Z axis coordinate position and the A coordinate positions of grinding starting point and grinding terminal.According to reason, in the whole process of being moved to grinding terminal by grinding starting point at emery wheel, emery wheel all should be positioned at thread groove center, and emery wheel both sides spark equal and opposite in direction.
But in actual grinding process, emery wheel is not positioned at thread groove center, and stably amesiality, namely the spark of emery wheel one side is larger, and opposite side spark is less.Moreover, the amesiality order of severity and the pitch helical pitch of emery wheel lthe aggregate velocity relevant, during with grinding, Z axis and A axle move vrelevant.To certain pitch helical pitch land aggregate velocity v, deviation remains unchanged.
This bias phenomenon of numerical control screw thread spiral shell as shown in Figure 4.During tool setting success, emery wheel is positioned at thread groove center P 4( z 4, a 4), according to P 4( z 4, a 4) coordinate, calculate grinding original position coordinate P 2( z 2, a 2) and grinding final position coordinate P 3( z 3, a 3).Digital control system is sent grinding instruction, makes emery wheel with aggregate velocity vby P 2( z 2, a 2) to P 3( z 3, a 3) mobile, when workpiece is carried out to grinding, find that emery wheel is not positioned at thread groove center, but deflection right side.Look that emery wheel right side spark is larger.
2, the analysis to numerical control screw thread mill bias phenomenon
First, in screw thread mill tool setting process, digital control system is sent instruction, make Z axis and A axle with aggregate velocity v by P 0' (Z 0, A 0') put to P 1' (Z 1, A 1') put and move, as shown in Figure 5.Lead is L, P 0' (Z 0, A 0') and P 1' (Z 1, A 1') coordinate position meet equation (1)
Z 1 - Z 0 L = A 1 ′ - A 0 ′ 360 - - - ( 4 )
Secondly, in tool setting process, in order to allow emery wheel be positioned at thread groove centre position, need to operate Z axis handwheel and X-axis handwheel, X-axis handwheel is controlled emery wheel advance and retreat cutter, and Z axis handwheel is controlled emery wheel and moved left and right aligning thread groove centre position.After operation Z axis handwheel, Z axis coordinate has change, and Z axis and A axle still keep interaction relation, and this is reflected on Fig. 5, is equivalent to Z axis A axle still edge and P 0' P 1' parallel another track P of trajectory 2p 3mobile.Operating personnel are confirming that emery wheel is positioned at thread groove centre position, and after the spark equal and opposite in direction of the emery wheel left and right sides, press " tool setting success button ", and system records current coordinate position P automatically 4(Z 4, A 4).Digital control system is according to current coordinate position P 4(Z 4, A 4) calculate Z 0position and Z 1the A coordinate positions A that position is corresponding 2and A 3.
According to reason, after tool setting success, if wheel grinding is from P 2(Z 0, A 2) put to P 3(Z 1, A 3) put while moving, emery wheel should just in time be positioned at the center of thread groove, and both sides spark equal and opposite in direction.
In fact, due to the difference of acceleration and deceleration control characteristic in Z axis and A axle servo characteristic, motor characteristic and interpolation algorithm, Z axis and A axle are difficult to keep synchronous operation utterly.Generally speaking, the load of rotating shaft A axle is lighter, and acceleration and deceleration performance is better.At motion initial period, A axle can reach stabilized speed sooner than Z axis.Move to while approaching final position, A axle also can stop within the shorter time.So digital control system is sent instruction, make Z axis and A axle by P 0' ( z 0, a 0') put to P 1' ( z 1, a 1') when mobile, Z axis and A axle are not along P in Fig. 5 0' to P 1' dashed trace (instruction track) mobile, but along P 0' to P 1' solid line track (actual path) mobile.
In like manner, according to the successful coordinate position P of tool setting 4( z 4, a 4) calculate corresponding grinding origin coordinates position P 2( z 0, a 2) and grinding terminal point coordinate position P 3( z 1, a 3) after, digital control system is sent instruction, makes Z axis and A axle by P 2( z 0, a 2) put to P 3( z 1, a 3) when mobile, Z axis and A axle are not along P in Fig. 5 2to P 3dashed trace (instruction track) mobile, but along P 2to P 3solid line track (actual path) mobile.
Obviously, although P 4point and P 2to P 3instruction track (dashed trace) on every bit, can both guarantee that emery wheel is positioned at thread groove center.But digital control system is sent instruction, make Z axis and A axle by P 2( z 0, a 2) put to P 3( z 1, a 3) when mobile, the actual path of Z axis and A axle (solid line track) and instruction track is also inconsistent.Therefore, although during tool setting, emery wheel is positioned at thread groove center, and when grinding, emery wheel is not positioned at thread groove center.Offset tool phenomenon produces thus.
3, the calculating of numerical control screw thread mill departure
Fig. 6 is the calculating schematic diagram of numerical control screw thread mill tool setting and grinding departure.
First digital control system is sent instruction, makes Z axis and A axle with aggregate velocity v, by P 0to P 1mobile, according to analysis above, Z axis and A axle will be along P 0to P 1actual path (solid line track) mobile, and through P 4point.During tool setting success, digital control system is sent instruction, automatically records P 4point coordinates position.According to P 4point coordinates value, calculates P 2( z 2, a 2) point and P 3( z 3, a 3) point coordinates position is as follows:
(5a)
(5b)
(6a)
(6b)
When digital control system, send instruction, make Z axis and A axle with aggregate velocity vby P 2point is to P 3when point is mobile, Z axis and A axle are not along P 2to P 3instruction track (dotted line) mobile, but along P 2to P 3actual path (solid line) mobile.Moreover, P 2to P 3the profile that forms of instruction track, actual path, with P 0to P 1the profile that forms of instruction track, actual path keep translational symmetry.That is to say P 0to P 1the profile that forms of instruction track, actual path move up ( a 2- a 0) or ( a 3- a 1) ,get final product and P 2to P 3the contour convergence that forms of instruction track, solid line track.
If at P 4point, emery wheel is just in time positioned at thread groove center, according to P 4point calculates P 2point and P 3behind point coordinates position, system is sent with aggregate velocity v, by P 2point is to P 3after the instruction of the mobile grinding of point, Z axis and A axle will be along P 2to P 3actual path (solid line) walking.That is, when A axle rotates to a 4during angle, Z axis is positioned at z 8position, emery wheel is positioned at P 8( z 8, a 4) position; Also can say, when Z axis moves to z 4during coordinate position, A axle is positioned at a 6position, emery wheel is positioned at P 6( z 4, a 6) position.If P 4( z 4, a 4) position emery wheel is just in time positioned at thread groove center, P 8( z 8, a 4) position and P 6( z 4, a 6) position, emery wheel is just in time positioned at the position that groove center takes over.In any case emery wheel can not be along P 2to P 3instruction track (dotted line) walking, emery wheel also can not be positioned at thread groove center.
Said process embodies work in-process: during tool setting, emery wheel is just in time positioned at thread groove center P 4( z 4, a 4), emery wheel both sides spark equal and opposite in direction, and during grinding, emery wheel is positioned at the P that thread groove center takes over 8( z 8, a 4) position and P 6( z 4, a 6) position, emery wheel right side spark is bigger than normal.
Discuss and how to solve the offset issue to cutter position and actual grinding position below.
Digital control system is sent instruction, makes Z axis and A axle with aggregate velocity vby P 0point is to P 1point is mobile, and emery wheel is along P 0to P 1point actual path moves to P 4( z 4, a 4) point.Can be according to P 0point is to P 1the instruction track of point, calculating A axial coordinate value is A 4time, the Z axis coordinate figure on corresponding instruction track (dotted line) z 7, calculate P 7( z 7, a 7) point coordinate position; Also can calculate Z axis coordinate is z 4time, the A axial coordinate value on corresponding instruction track (dotted line) a 5, calculate P 5( z 5, a 5) point coordinate position.According to Fig. 6 and (1) formula, have
(7a)
(7b)
(8a)
(8b)
After above formula is arranged,
(9a)
(9b)
(10a)
(10b)
Due to P 2to P 3the profile that forms of actual path, instruction track, with P 0to P 1the profile that forms of actual path, instruction track there is translational symmetry, in Fig. 6, can find out P 8p 4distance and P 4p 7distance is equal, and this distance is exactly that pitch helical pitch is l, Z axis and A axle are with aggregate velocity v, according to pitch helical pitch lrelation, by P 0(or P 2) to P 1(or P 3) when mobile, Z axis theoretical coordinate position and real coordinate position poor; P 5p 4distance and P 4p 6distance is equal, and this distance is exactly that pitch helical pitch is l, Z axis and A axle are with aggregate velocity v, according to pitch helical pitch lrelation, by P 0(or P 2) to P 1(or P 3) when mobile, this coordinate position is exactly the poor of A axle theoretical coordinate position and real coordinate position.According to (3a) formula and (3b) formula, there is following relation
(11a)
(11b)
4, solve the method for numerical control screw thread mill offset issue
Therefore, if P 2to P 3the profile integral body that forms of actual path, instruction track move to right distance, to P 2' P 3' position, as shown in Figure 7, in the grinding instruction of this reflection, by system, send instruction exactly, make Z axis A axle with aggregate velocity v, by P 2' put to P 3' put and move.Like this, emery wheel will be along P 2' to P 3' actual path (solid line) walking, obviously, emery wheel moves to P 4during point, emery wheel coordinate position is exactly tool setting success position, is just in time positioned at thread groove center.In the same way, at P 2' to P 3' actual path (solid line) main part, emery wheel is all positioned at thread groove center, and the bias phenomenon of cutter position and grinding position is eliminated.
As a same reason, if P 2to P 3the profile integral body that forms of actual path, instruction track move down distance, to P 2' ' P 3' ' position, as shown in Figure 8, in the grinding instruction of this reflection, by system, send instruction exactly, make Z axis A axle with aggregate velocity v, by P 2' ' put to P 3' ' the mobile instruction of point.Like this, emery wheel will be along P 2' ' to P 3' ' actual path (solid line) walking.Obviously, emery wheel moves to P 4during point, emery wheel coordinate position is exactly tool setting success position, is just in time positioned at thread groove center.In the same way, at P 2' ' to P 3' ' actual path (solid line) main part, emery wheel is all positioned at thread groove center, and the bias phenomenon of cutter position and grinding position is eliminated.
In general, lead is different, appointment aggregate velocity during grinding is different, by grinding starting point, to instruction track, the actual path profile of grinding terminal, can present different forms.Therefore, for specific lead laggregate velocity during with grinding v, need to measure corresponding or .
The present invention has obvious advantage, utilizes the screw thread of the present invention's machining high-precision on numerical control screw thread grinding machine, can be at Z axis and A axle according to lead l, with aggregate velocity vin the moving process of interlock, by tool setting departure (or ) automatically extract, and in grinding automatically by tool setting departure (or ) join in grinding start position coordinate figure and grinding final position coordinate figure, thereby eliminate the offset tool phenomenon in the processing of numerical control screw thread grinding machine, improve machining accuracy and efficiency.
Accompanying drawing explanation
Fig. 1 is numerical control screw thread grinding machine workpiece of the present invention, emery wheel and dresser coordinate system.
Fig. 2 is numerical control screw thread mill tool setting process schematic diagram.
Fig. 3 is numerical control screw thread mill grinding process schematic diagram.
Fig. 4 is bias phenomenon schematic diagram in numerical control screw thread mill grinding process.
Instruction track when Fig. 5 is tool setting, actual path P 0' P 1' and tool setting success after instruction track, actual path P during grinding 2p 3.
Fig. 6 is that instruction track and actual path departure are calculated schematic diagram.
Fig. 7 is P 2and P 3the skew of some Z coordinate position after instruction track and actual path.
Fig. 8 is P 2and P 3the skew of some A coordinate position after instruction track and actual path.
The specific embodiment
embodiment 1
If 4 millimeters of leading screw workpiece leads, according to technological requirement, intend carrying out grinding with the aggregate velocity of 3000 millis m/min.According to operating personnel custom, intend carrying out tool setting with the aggregate velocity of 2000 millis m/min.Grinding start position P 2z coordinate be 700 millimeters; Grinding terminal P 3z coordinate position be 1400 millimeters; Tool setting starting point P 0z coordinate position be 900 millimeters; Tool setting terminal P 1z coordinate position be 1100 millimeters.Implementation step is as follows:
The 1st step: aggregate velocity 3000 millis m/min while making emery wheel with grinding, from tool setting starting point P 0(900, A0) to tool setting terminal P1 (1100, a 0+ 360*200/4) mobile;
The 2nd step: system, during Z coordinate is 910 millimeters to 1000 millimeters, gathers current Z axis coordinate figure and A axial coordinate value automatically, according to (3a) formula or (3b) formula calculate Δ z lv or Δ a lv ;
(3a)
(3b)
The 3rd step: aggregate velocity 2000 millis m/min while making emery wheel with tool setting, from tool setting starting point P 0(900, a 0) to tool setting terminal P 1(1100, a 0+ 360*200/4) mobile;
The 4th step: operation handwheel, make emery wheel be positioned at thread groove centre position, and emery wheel both sides spark equal and opposite in direction, press " tool setting success button ", system records current Z axis coordinate position and A coordinate positions P automatically 4( z 4, a 4).System calculates grinding starting point coordinate position P thus automatically 2( z 2, a 2) and grinding terminal point coordinate position P 3( z 3, a 3) as follows:
(13a)
(13b)
(14a)
(14b)
The 5th step: digital control system is sent instruction automatically, makes Z axis and A axle with aggregate velocity 3000 mm/second, from grinding original position , to grinding final position grinding.Or, make Z axis and A axle with aggregate velocity 3000 mm/second, from grinding original position , to grinding final position grinding.
Illustrate: tool setting departure Δ z lv and Δ a lv only relevant with workpiece leading screw pitch helical pitch, the Z axis A axle aggregate velocity during with grinding vrelevant.If grinding process requires with a plurality of different Z axis A axle aggregate velocities v 1, v 2, v 3complete grinding, by the 1st, 2 steps in triplicate, show that Z axis A axle aggregate velocity is v 1, v 2with v 3time, corresponding tool setting departure Δ z lv1 (Δ a lv1 ), Δ z lv2 (Δ a lv2 ) and Δ z lv3 (Δ a lv3 ); The 5th step with v 1, v 2with v 3during speed grinding work piece, use respectively Δ z lv1 (Δ a lv1 ), Δ z lv2 (Δ a lv2 ) and Δ z lv3 (Δ a lv3 ) determine grinding start position P 2' (P 2' ') and grinding final position P 3' (P 3' ').

Claims (2)

1. an extraction method for the departure in numerical control screw thread mill tool setting and grinding, is characterized in that comprising the steps:
The 1st step: leading screw workpiece to be ground is fixed on numerical control screw thread Grinder bench, or does not install, workpiece lead is set is l, during grinding work piece, Z axis and A axle aggregate velocity are v, described aggregate velocity vrefer to that Z axis moves lead lapart from time, the aggregate velocity of A axle rotating 360 degrees simultaneously;
The 2nd step: digital control system is sent instruction, the aggregate velocity while making Z axis and A axle with grinding work piece v, from origin coordinates position P 0( z 0, a 0) to terminal point coordinate position P 1( z 1, a 1) mobile;
P wherein 0( z 0, a 0) and P 1( z 1, a 1) coordinate meets following relation:
(1)
Z axis starts 1 ~ 5 millimeter of displacement, and A axle interlock is followed, and when the aggregate velocity of Z axis and A axle reaches while stablizing, then carries out next step;
The 3rd step: in aggregate velocity vafter stable, system records Z axis real coordinate position automatically z 1, z 2..., z i ..., z n-1 , z n , and A axle real coordinate position a 1, a 2..., a i ..., a n-1 , a n ; When Z axis moves to distance P 1( z 1, a 1) first 5 ~ 1 millimeters, system stops record automatically;
The 4th step: according to the 2nd step P 0( z 0, a 0) and P 1( z 1, a 1) coordinate figure and the 3rd step record A axle real coordinate position a 1, a 2..., a i ..., a n-1 , a n , calculate corresponding Z axis theoretical coordinate position z 1 ', z 2 '..., z i '..., z n-1 ', z n ';
or according to the 2nd step P 0( z 0, a 0) and P 1( z 1, a 1) coordinate figure and the 3rd step record the real coordinate position of Z axis z 1, z 2..., z i ..., z n-1 , z n time, calculate the theoretical coordinate position of corresponding A axle a 1 ', a 2 '..., a i '..., a n-1 ', a n ';
Computing formula is as follows:
(2a)
(2b)
The 5th step: the mean value Δ that calculates the difference of Z axis theoretical coordinate position and real coordinate position z lv or the mean value Δ of the difference of A axle theoretical coordinate position and real coordinate position a lv ;
Computing formula is as follows:
(3a)
(3b)
Δ z lv that Z axis and A axle are according to pitch helical pitch l, with stable aggregate velocity vwhen mobile, Z axis theoretical coordinate position and real coordinate position poor;
Δ z lv be the Z axis departure in numerical control screw thread mill;
Δ a lv that Z axis and A axle are according to pitch helical pitch l, with stable aggregate velocity vwhen mobile, A axle theoretical coordinate position and real coordinate position poor;
Δ a lv be the A axle departure in numerical control screw thread mill;
Δ z lv and Δ a lv all can be for correcting the tool setting bias phenomenon of screw thread mill;
Said process is the extraction method of Z axis in numerical control screw thread mill or A axle departure.
2. in the grinding of screw thread mill, eliminate a method for departure, it is characterized in that comprising the steps:
The 1st step: leading screw workpiece to be ground is fixed on numerical control screw thread Grinder bench;
Workpiece lead is set is l, during grinding work piece, the synthetic translational speed of Z axis and A axle is v;
The 2nd step: by traditional tool setting process, calculate grinding starting point Z coordinate position z 2corresponding rotating shaft A coordinate figure a 2, calculate grinding terminal Z coordinate position z 3corresponding rotating shaft A coordinate figure a 3;
The 3rd step: make Z axis and A axle with aggregate velocity v, from grinding original position ( z 2+ Δ z lv , a 2), to grinding terminal point coordinate position ( z 3+ Δ z lv , a 3) grinding; Or, make Z axis and A axle with aggregate velocity v, from grinding original position ( z 2, a 2+ Δ a lv ), to grinding terminal point coordinate position ( z 3, a 3+ Δ a lv ) grinding;
Δ wherein z lv for Z axis departure claimed in claim 1;
Δ wherein a lv for A axle departure claimed in claim 1.
CN201410315013.8A 2014-07-04 2014-07-04 Numerical control screw thread mill automatically extracting and removing method cutter and grinding large deviations amount Active CN104148752B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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