CN110328567B  Integrated machining method for measuring and grinding largedepthdiameterratio hole  Google Patents
Integrated machining method for measuring and grinding largedepthdiameterratio hole Download PDFInfo
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 CN110328567B CN110328567B CN201910544895.8A CN201910544895A CN110328567B CN 110328567 B CN110328567 B CN 110328567B CN 201910544895 A CN201910544895 A CN 201910544895A CN 110328567 B CN110328567 B CN 110328567B
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 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B47/00—Drives or gearings; Equipment therefor
 B24B47/20—Drives or gearings; Equipment therefor relating to feed movement

 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
 B24B49/003—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving acoustic means

 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
 B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent

 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
 B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
 B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally
 B24B5/10—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally involving a horizontal tool spindle

 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
 B24B5/36—Singlepurpose machines or devices
 B24B5/40—Singlepurpose machines or devices for grinding tubes internally

 B—PERFORMING OPERATIONS; TRANSPORTING
 B24—GRINDING; POLISHING
 B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
 B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
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 Mechanical Engineering (AREA)
 Physics & Mathematics (AREA)
 Acoustics & Sound (AREA)
 Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
 Numerical Control (AREA)
 Automatic Control Of Machine Tools (AREA)
Abstract
A large depthdiameter ratio hole measuring and grinding integrated processing method belongs to the field of inner circle precision grinding processing. In the machining process, the measuring needle is used for measuring the aperture of each section of the workpiece, the machining stage is judged by calculating the machining allowance delta of the inner hole of the workpiece, and the corresponding machining parameters are selected for grinding the inner hole of the workpiece. When delta_{0}More than 0.5mm, rough machining parameters are adopted, and the grinding rod prepressing amount is 2/3Xs & lt Xa_{p0}Xs is less than or equal to, and the cutting depth is 20 mu m and is less than a_{p}Less than or equal to 30 mu m; when 0.1mm < delta_{1}When the thickness is less than or equal to 0.5mm, adopting semifinishing parameters, and the prepressing quantity of the grinding rod is 1/3Xs and Xa is less than_{p0}Not more than 2/3Xs, and a depth of 10 μm_{p}Less than or equal to 20 mu m; when 0.01mm < delta_{2}When the thickness is less than or equal to 0.1mm, fine machining parameters are adopted, and the prepressing amount of the grinding rod is 1/4Xs and Xa is less than_{p0}Not more than 1/3Xs, and a depth of 2 μm_{p}Less than or equal to 10 mu m; when delta_{3}When the diameter is less than or equal to 0.01mm, parameters of the final processing stage are adopted, and the prepressing amount of the grinding rod is more than 0 and less than Xa_{p0}Not more than 1/4Xs, and a is cut to a depth of 0 μm_{p}Less than or equal to 2 mu m. The invention realizes the integrated automatic processing of the measurement and grinding of the hole with large depthdiameter ratio, improves the production efficiency, reduces the rejection rate, has simple operation and lightens the labor intensity of operators.
Description
Technical Field
The invention belongs to the field of inner circle precision grinding and machining, and relates to a large depthdiameter ratio hole measuring and grinding integrated machining method.
Background
The parts such as the thinwall sleeve with large depthdiameter ratio, the actuator cylinder and the like are important supporting parts and hydraulic moving parts for forming a vibration buffering unit and a retraction moving unit of the aircraft landing gear, and are core components of the aircraft landing gear. In order to ensure high reliability and high quality of service performance of the aircraft landing gear and prevent highpressure oil leakage or jamming and other faults of moving parts in the using process, the precision and surface quality of inner holes of deephole thinwall structural parts such as sleeves and actuating cylinders must be ensured.
At present, the parts are mainly processed on a common deep hole internal grinding machine, and because the parts have the characteristics of large depthdiameter ratio, small aperture and thin wall, a grinding rod used for processing is slender, the rigidity is poor, and a grinding wheel has large cutter backoff in the processing process, so that the actual removal depth of materials is smaller than the theoretical cutting depth a each time_{p}In order to ensure that the inner hole meets the requirement of dimensional precision after the workpiece is machined, an operator needs to repeatedly measure the aperture of the workpiece by using an inside micrometer in the semifinishing and finishing stages and determine the next feeding cutting depth a_{p}The size of (2). Because the internal micrometer used for measurement is long, the coaxiality error between the axis of the internal micrometer and the axis of the inner hole of the workpiece during measurement brings great error to the measurement result, and the serious result that the aperture of the workpiece is processed out of tolerance and is scrapped is easily caused; meanwhile, the inner hole structure of the actuating cylinder is complex and comprises a plurality of steps, transition arcs and step surfaces, the hole diameters of a plurality of sections of inner holes are required to be measured during the hole diameter measurement, the measurement workload is very large in the whole processing period of a workpiece, the labor intensity of workers is greatly increased, the measuring process occupies a large part of the whole processing time, and the processing efficiency is seriously reduced; because the aperture measurement is completed manually, the automatic processing of the integration of measurement and processing can not be realized. The traditional machining method has the advantages of low machining efficiency, poor workpiece precision consistency, high rejection rate, extremely high technical requirements on operators and high labor intensity of workers, and cannot meet the requirements of precise and efficient machining and mass production of parts, so that a new hole measuring and grinding integrated machining process with a large depthdiameter ratio is urgently needed to be invented or developed to solve the problems and achieve precise, efficient and automatic machining of parts with the large depthdiameter ratio, and a technical guarantee is provided for precise machining of key parts for aerospace.
Disclosure of Invention
Aiming at the problems of low processing efficiency, poor part precision retentivity and incapability of establishing a relative position relation between measurement and grinding, the invention provides a large depthdiameter ratio hole measurement and grinding integrated processing method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a large depthdiameter ratio hole measuring and grinding integrated processing method comprises the following steps:
and S1, starting the machine tool, installing the workpiece and the grinding wheel, and confirming that the working state and the machining program of the machine tool are normal.
S2, controlling the Zaxis workbench of the machine tool to rapidly move to a Zdirection safety position coordinate Z_{1}＝Z_{0}180, wherein Z_{0}When the right end face of the grinding wheel is contacted with the left end face of the workpiece, the Zaxis raster coordinate value of the machine tool, namely Z_{0}Is a zero point of the workpiece in the Z direction;
s3, controlling the Xaxis workbench of the machine tool to rapidly move to the Xdirection safe position coordinate X_{0}，X_{0}And when the rotation center of the workpiece is coincident with the axis of the grinding rod, the Xaxis raster coordinate value of the machine tool is obtained.
S4, pore diameter measurement: controlling the Xaxis workbench and the Zaxis workbench of the machine tool to move, measuring the aperture of each section of the workpiece by using the measuring needle, recording Xdirection and Zdirection coordinates of a ball head of the measuring needle at the corresponding aperture in a machine tool coordinate system, and taking the minimum value D in the measured apertures_{min}And the coordinate (X) of the ball of the stylus at its corresponding position in the machine coordinate system_{2},Z_{2})。
S5, tool setting of a grinding wheel: at the position of the minimum cross section of the aperture of the workpiece, according to the relative position relationship between the grinding wheel and the ball head of the measuring probe, the quick tool setting of the grinding wheel is completed by utilizing acoustic emission, and the coordinate values (Xdirection and Zdirection coordinate values) of the grinding wheel in the machine tool coordinate system at the moment are recorded_{3},Z_{3}) And controlling the Xaxis workbench and the Zaxis workbench of the machine tool to rapidly move to an Xdirection safety position X_{0}And Zdirection safety position Z_{1}。
S6, judging the machining allowance delta_{0}＝D_{0}+EID_{min}If > 0.5mm is true, yes, go to step S7, no, go to step S11, where D is_{0}Is the nominal aperture of the workpiece and EI is the lower deviation of the aperture.
S7, starting a workpiece spindle motor to drive a workpiece to rotate to a working rotating speed through a threejaw chuck, simultaneously starting a grinding wheel spindle to the working rotating speed, adopting rough machining parameters, wherein Xs is the maximum bending deformation allowed when the grinding rod is safely used, and controlling the prepressing amount of the grinding rod applied to the Xaxis workbench of the machine tool to be Xa_{p0}，2/3Xs＜Xa_{p0}≤Xs。
S8, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number of grinding cycles n in the rough machining stage_{1}Wherein L is the length of the inner hole of the workpiece, and delta b is more than or equal to 0_{1}≤1/2B，1/2B≤Δb_{2}B is not more than B, B is the width of the grinding wheel, f is not less than 100mm/min_{a}≤200mm/min。
S9, judgmentIf true, execute step S10, if true, execute step S8, where N is_{1}1, 2 and 3 …, the concrete value is determined according to the grinding rod prepressing Xa of the rough machining stage_{p0}Cutting depth a_{p}And a machining allowance delta_{0}And (4) determining.
S10, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{1}。
S11, judging that the machining allowance is more than delta and 0.1mm_{1}＝D_{0}+EID_{1}If not more than 0.5mm is established, if yes, step S12 is executed, and if no, step S8 is executed.
S12, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting semifinishing parameters_{p0}，1/3Xs＜Xa_{p0}≤2/3Xs。
S13, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，10μm＜a_{p}Less than or equal to 20 mu m, reciprocating of Zaxis workbenchSpeed f_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，10μm＜a_{p}Less than or equal to 20 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number n of grinding cycles in the semifinishing stage_{2}。
S14, judgmentIf true, go to step S15, No, go to step S13, where N is_{2}1, 2 and 3 …, the concrete value is according to the grinding rod prepressing amount Xa of the semifinishing stage_{p0}Cutting depth a_{p}And a machining allowance delta_{1}And (4) determining.
S15, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{2}。
S16, judging that the machining allowance is more than delta and 0.01mm_{2}＝D_{0}+EID_{2}If not more than 0.1mm is true, if yes, step S17 is executed, and if no, step S13 is executed.
S17, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting the finish machining parameters_{p0}，1/4Xs＜Xa_{p0}≤1/3Xs。
S18, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}。
S19, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{3}。
S20, judging the machining allowance delta_{3}＝D_{0}+EID_{3}If not greater than 0.01mm, if yes, go to step S21, if no, go to step S18.
S21, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting the final stage machining parameters_{p0}，0≤Xa_{p0}≤1/4Xs。
S22, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，0＜a_{p}Less than or equal to 2 microns, the reciprocating speed f of the Zaxis worktable_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，0＜a_{p}Less than or equal to 2 microns, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}。
S23, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{4}。
S24, judgment D_{0}+EI≤D_{4}≤D_{0}If + ES is established, if yes, step S25 is executed, and if no, step S22 is executed.
S25, controlling the Xaxis workbench of the machine tool to rapidly move to the Xdirection safety position X_{0}Zaxis workbench rapidly moves to Zdirection safety position Z_{1}And finishing the grinding processing.
Further, the number of grinding cycles for the grinding wheel to wear in the different grinding stages is determined(wherein N is the largest integer, G is the grinding ratio determined by a process test based on the grinding wheel and the material of the workpiece to be machined, v_{Grinding wheel}D is the abrasion loss of the grinding wheel_{min}、D_{1}、D_{2}、D_{3}，a_{p}Corresponding to the cutting depth of one machining stage), dressing the grinding wheel after the grinding wheel is worn, and compensating the grinding wheel dressing amount b into the Xdirection feeding coordinate of the machine tool.
Compared with the prior art, the invention has the following advantages:
(1) the hole measuring and grinding integrated processing method with the large depthdiameter ratio can be realized, the measuring needle is used for automatically measuring the aperture of each section of the workpiece in the grinding process, the manual measurement in the traditional grinding processing is avoided, the labor intensity of workers is reduced, and the aperture measuring precision is ensured, so that the rejection rate is reduced, the consistency of the inner hole precision of the workpiece is improved, and the processing efficiency is improved.
(2) The large depthdiameter ratio hole measuring and grinding integrated processing method can be realized, the current processing stage of the workpiece is determined according to the hole diameter measuring result, and the grinding processing is carried out by selecting proper technological parameters, so that the processing efficiency is improved, and the automatic processing integrating measuring and grinding is realized; meanwhile, the invention has simple operation and reduces the technical requirements on operators.
Drawings
Fig. 1 is a schematic view of a measurementmachining integrated numerical control deep hole grinding machine according to an embodiment of the invention.
FIG. 2 is a flow chart of the large depth to diameter ratio hole grinding process according to an embodiment of the present invention.
In the figure: the device comprises a lathe bed 1, a 2Zaxis workbench, a 3 workpiece, a 4 grinding wheel, a 5 center frame, a 6 grinding wheel dresser, a 7 grinding rod, an 8Xaxis workbench, a 9 measuring rod, a 10 measuring pin, a11 measuring pin ball a, a 12 measuring pin ball b, a 13 threejaw chuck, a 14 spindle box and a 15 motor.
Detailed Description
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts.
A measuring and grinding integrated processing method for a hole with a large depthdiameter ratio is realized based on a measuringprocessing integrated numerical control deep hole grinding machine shown in figure 1, and the grinding machine comprises a machine body 1, a Zaxis workbench 2, a center frame 5, a grinding wheel dresser 6, a grinding rod 7, an Xaxis workbench 8, a measuring rod 9, a measuring needle 10, a measuring needle ball head a11, a measuring needle ball head b12, a threejaw chuck 13, a spindle box 14 and a motor 15. The Xaxis workbench 8 and the Zaxis workbench 2 are arranged on the bed body 1 and can move on the bed body 1 along the Xaxis direction and the Zaxis direction, one end of the grinding rod 7 is clamped and fixed on the Xaxis workbench 8 through a tensioning sleeve, the other end of the grinding rod is connected with the grinding wheel 4, one end of the measuring rod 9 is clamped and fixed on the Xaxis workbench 8 through the tensioning sleeve, and the other end of the measuring rod is connected with the measuring needle 10. The workpiece 3 is mounted on the Zaxis table 2, one end of the workpiece 3 is connected to a threejaw chuck 13, the threejaw chuck 13 is connected to a motor 15 through a headstock 14, and the other end of the workpiece 3 is supported by a center frame 5.
A measuring and grinding integrated processing method for a hole with a large depthdiameter ratio is shown in figure 2 and comprises the following steps:
s1, starting the machine tool, installing the workpiece 3 and the grinding wheel 4, and confirming that the working state and the machining program of the machine tool are normal;
s2, controlling the Zaxis workbench 2 of the machine tool to rapidly move to a Zdirection safety position coordinate Z_{1}＝Z_{0}180, wherein Z_{0}When the right end face of the grinding wheel 4 is contacted with the left end face of the workpiece 3, the Zaxis raster coordinate value of the machine tool, namely Z_{0}Is the zero point of the workpiece in the 3Z direction;
s3, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safe position coordinate X_{0}，X_{0}When the rotation center of the workpiece 3 coincides with the axis of the grinding rod 7, the Xaxis raster coordinate value of the machine tool is obtained;
s4, pore diameter measurement: controlling the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to move, measuring the aperture of each section of the workpiece 3 by using the measuring needle 10, recording Xdirection and Zdirection coordinates of a ball head of the measuring needle at the corresponding aperture in a machine tool coordinate system, and taking the minimum value D in the measured aperture_{min}And the coordinate (X) of the ball of the stylus at its corresponding position in the machine coordinate system_{2},Z_{2})；
S5, tool setting of a grinding wheel: at the position of the minimum cross section of the aperture of the workpiece 3, according to the relative position relationship between the grinding wheel 4 and the ball head of the measuring probe, the quick tool setting of the grinding wheel 4 is completed by utilizing acoustic emission, and the coordinate values (Xdirection and Zdirection coordinate values) of the grinding wheel 4 in the machine tool coordinate system at the moment are recorded_{3},Z_{3}) And controls the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to rapidly move to an Xdirection safety position X_{0}And Zdirection safety position Z_{1}；
S6, judging the machining allowance delta_{0}＝D_{0}+EID_{min}If > 0.5mm is true, yes, go to step S7, no, go to step S11, where D is_{0}Is the nominal aperture of the workpiece 3, and EI is the lower deviation of the aperture;
s7, starting the workpiece spindle motor 15 to drive the workpiece 3 to rotate to a working rotating speed through the threejaw chuck 13, and simultaneously starting the grinding wheel spindle to the working rotating speed, wherein rough machining parameters are adopted, and Xs is used as the following for installing the grinding rod 7The maximum bending deformation allowed in full use controls the prepressing quantity of the grinding rod 7 applied by the Xaxis worktable 8 of the machine tool to be Xa_{p0}，2/3Xs＜Xa_{p0}≤Xs；
S8, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}Moving to Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number of grinding cycles n in the rough machining stage_{1}Wherein L is the length of an inner hole of the workpiece 3, and delta b is more than or equal to 0_{1}≤1/2B，1/2B≤Δb_{2}B is not more than B, B is the width of the grinding wheel 4, f is not less than 100mm/min_{a}≤200mm/min；
S9, judgmentIf true, execute step S10, if true, execute step S8, where N is_{1}1, 2 and 3 …, the specific value is determined according to the prepressing amount Xa of the grinding rod 7 at the rough machining stage_{p0}Cutting depth a_{p}And a machining allowance delta_{0}Determining;
s10, measuring the aperture of each section of the workpiece 3 by using the measuring needle, and recording the minimum aperture as D_{1}；
S11, judging that the machining allowance is more than delta and 0.1mm_{1}＝D_{0}+EID_{1}If the thickness is less than or equal to 0.5mm, if yes, executing the step S12, and if not, executing the step S8;
s12, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting semifinishing parameters_{p0}，1/3Xs＜Xa_{p0}≤2/3Xs；
S13, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}，10μm＜a_{p}Less than or equal to 20 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}，10μm＜a_{p}Less than or equal to 20 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number n of grinding cycles in the semifinishing stage_{2}；
S14, judgmentIf true, go to step S15, No, go to step S13, where N is_{2}1, 2 and 3 …, the specific value is determined according to the prepressing amount Xa of the grinding rod 7 at the semifinishing stage_{p0}Cutting depth a_{p}And a machining allowance delta_{1}Determining;
s15, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{2}；
S16, judging that the machining allowance is more than delta and 0.01mm_{2}＝D_{0}+EID_{2}If the thickness is less than or equal to 0.1mm, if yes, executing the step S17, and if not, executing the step S13;
s17, controlling the Xaxis workbench 8 of the machine tool to apply the prepressing amount Xa of the grinding rod 7 by adopting the finish machining parameters_{p0}，1/4Xs＜Xa_{p0}≤1/3Xs；
S18, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}；
S19, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{3}；
S20, judging the machining allowance delta_{3}＝D_{0}+EID_{3}If the thickness is less than or equal to 0.01mm, if yes, executing the step S21, and if not, executing the step S18;
s21, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting the final stage processing parameters_{p0}，0≤Xa_{p0}≤1/4Xs；
S22, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}，0＜a_{p}Less than or equal to 2 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlFeeding cutting depth a of Xaxis worktable 8 of machine tool_{p}，0＜a_{p}Less than or equal to 2 mu m, the reciprocating speed f of the Zaxis worktable 2_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}；
S23, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{4}；
S24, judgment D_{0}+EI≤D_{4}≤D_{0}If + ES is established, if yes, step S25 is executed, if no, step S22 is executed;
s25, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safety position X_{0}Zaxis workbench 2 rapidly moves to Zdirection safety position Z_{1}And finishing the grinding processing.
The specific method for completing the quick tool setting of the grinding wheel 4 by using acoustic emission in the step S5 is the same as that described in chinese patent No. CN201710047333.3, and specifically includes: according to the coordinate (X) of the corresponding measuring needle ball head b12 at the minimum measuring section of the bore diameter in a bed coordinate system_{2},Z_{2}) And determining the coordinates (including the safety allowance in the X direction and the Z direction) of the target tool setting position of the grinding wheel by measuring the relative position relationship between the ball head b12 and the grinding wheel 4 in the X direction and the Z direction, controlling the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to enable the grinding wheel 4 to rapidly move to the target tool setting position and switch to slow movement, monitoring the contact state between the grinding wheel 4 and the workpiece 3 through a fluid acoustic emission sensor, generating transient elastic waves, namely acoustic emission signals, by friction between the grinding wheel 4 and the workpiece 3 and material removal of the workpiece 3 when the grinding wheel 4 is in contact with the workpiece 3, detecting the acoustic emission signals when the grinding wheel 4 is in contact with the workpiece 3 through the fluid acoustic emission sensor, finishing the precise tool setting of the grinding wheel 4 and the workpiece 3, and recording the coordinate values (X direction and Z direction) of the grinding wheel 4_{3},Z_{3})。
In addition, the number of grinding cycles for which the grinding wheel 4 has reached wear in the different grinding stages is determined(wherein N is the largest integer, G is the grinding ratio determined by a process test based on the materials of the grinding wheel 4 and the workpiece 3 to be machined, v_{Grinding wheel}The abrasion loss of the grinding wheel 4 is D ═ D_{min}、D_{1}、D_{2}、D_{3}，a_{p}Corresponding to the cutting depth of one machining stage), the grinding wheel 4 is dressed after it has worn out, and the dressing amount b of the grinding wheel 4 is compensated into the machine tool Xfeed coordinate.
Example 1
And S1, starting the machine tool, respectively installing the workpiece 3 and the grinding wheel 4 on the Zaxis workbench 2 and the grinding rod 7, and confirming that the working state and the machining program of the machine tool are normal.
S2, controlling the Zaxis workbench 2 of the machine tool to rapidly move to a Zdirection safety position coordinate Z_{1}＝Z_{0}180, wherein Z_{0}When the right end face of the grinding wheel 4 is contacted with the left end face of the workpiece 3, the Zaxis raster coordinate value of the machine tool, namely Z_{0}Is the zero point of the workpiece in the 3Z direction.
S3, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safe position coordinate X_{0}，X_{0}The Xaxis raster coordinate value of the machine tool is obtained when the rotation center of the workpiece 3 is coincident with the axis of the grinding rod 7.
S4, pore diameter measurement: controlling the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to move, measuring the aperture of each section of the workpiece 3 by using the measuring needle 10, recording Xdirection and Zdirection coordinates of a measuring needle ball head b12 at the position corresponding to the aperture in a machine tool coordinate system, and taking the minimum value D in the measured aperture_{min}And the coordinates (X) of the stylus ball b12 at its corresponding position in the machine coordinate system_{2},Z_{2})。
S5, tool setting of a grinding wheel: at the position of the minimum section of the aperture of the workpiece 3, according to the relative position relationship between the grinding wheel 4 and the measuring probe ball b12, the quick tool setting of the grinding wheel 4 is completed by utilizing acoustic emission, and the coordinate values (Xdirection and Zdirection coordinate values) of the grinding wheel 4 in the machine tool coordinate system at the moment are recorded_{3},Z_{3}) And controls the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to rapidly move to an Xdirection safety position X_{0}And Zdirection safety position Z_{1}。
S6, judging the machining allowance delta_{0}＝D_{0}+EID_{min}If > 0.5mm is true, yes, go to step S7, no, go to step S11, where D is_{0}Is the nominal aperture of the workpiece 3 and EI is the lower deviation of the aperture.
S7, starting the workpiece spindle motor 15 to drive the workpiece spindle motor through the threejaw chuck 13The part 3 rotates to the working rotating speed, meanwhile, the grinding wheel spindle is started to the working rotating speed, rough machining parameters are adopted, the maximum allowable bending deformation amount of the grinding rod in the embodiment is 0.7mm, and the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool is controlled_{p0}At this time, the preload amount Xa_{p0}＝0.65mm。
S8, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}30 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}30 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}Recording the number of grinding cycles n in the rough machining stage_{1}Wherein L is the length of the inner hole of the workpiece 3, Δ b_{1}＝Δb_{2}1/2B, B is the width of the grinding wheel 4.
S10, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{1}。
S11, judging that the machining allowance is more than delta and 0.1mm_{1}＝D_{0}+EID_{1}If not more than 0.5mm is established, if yes, step S12 is executed, and if no, step S8 is executed.
S12, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting semifinishing parameters_{p0}At this time, the preload amount Xa_{p0}＝0.4mm。
S13, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}20 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}20 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}Recording the number n of grinding cycles in the semifinishing stage_{2}。
S15, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{2}。
S16, judging that the machining allowance is more than delta and 0.01mm_{2}＝D_{0}+EID_{2}If not more than 0.1mm is true, if yes, step S17 is executed, and if no, step S13 is executed.
S17, controlling the Xaxis workbench 8 of the machine tool to apply the prepressing amount Xa of the grinding rod 7 by adopting the finish machining parameters_{p0}At this time, the preload amount Xa_{p0}＝0.2mm。
S18, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{ } _{p}8 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}8 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}。
S19, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{3}。
S20, judging the machining allowance delta_{3}＝D_{0}+EID_{3}If not greater than 0.01mm, if yes, go to step S21, if no, go to step S18.
S21, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting the final stage processing parameters_{p0}At this time, the preload amount Xa_{p0}＝0.15mm。
S22, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}2 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}2 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}。
S23, measuring the aperture of each section of the workpiece 3 by using the measuring needle 10, and measuring the minimumThe pore diameter is denoted D_{4}。
S24, judgment D_{0}+EI≤D_{4}≤D_{0}If + ES is established, if yes, step S25 is executed, and if no, step S22 is executed.
S25, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safety position X_{0}Zaxis workbench 2 rapidly moves to Zdirection safety position Z_{1}And finishing the grinding processing.
Grinding wheel reciprocating grinding in rough machining stageAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; grinding wheel reciprocating grinding in semifinishing stageAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; grinding wheel reciprocating grinding in finishing stageAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; grinding wheel reciprocating grinding in final machining stageAnd (4) performing grinding wheel dressing after the times (wherein N is the maximum integer), and compensating the grinding wheel dressing amount of each stage into the Xdirection feeding coordinate of the machine tool.
Example 2
And S1, starting the machine tool, respectively installing the workpiece 3 and the grinding wheel 4 on the Zaxis workbench 2 and the grinding rod 7, and confirming that the working state and the machining program of the machine tool are normal.
S2, controlling the Zaxis workbench 2 of the machine tool to rapidly move to a Zdirection safety position coordinate Z_{1}＝Z_{0}180, wherein Z_{0}When the right end face of the grinding wheel 4 is contacted with the left end face of the workpiece 3, the Zaxis raster coordinate value of the machine tool, namely Z_{0}Is the zero point of the workpiece in the 3Z direction.
S3, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safe position coordinate X_{0}，X_{0}When the rotation center of the workpiece 3 is coincident with the axis of the grinding rod 7Machine Xaxis raster coordinate values.
S4, pore diameter measurement: controlling the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to move, measuring the aperture of each section of the workpiece 3 by using the measuring needle 10, recording Xdirection and Zdirection coordinates of a measuring needle ball head b12 at the position corresponding to the aperture in a machine tool coordinate system, and taking the minimum value D in the measured aperture_{min}And the coordinates (X) of the stylus ball b12 at its corresponding position in the machine coordinate system_{2},Z_{2})。
S5, tool setting of a grinding wheel: at the position of the minimum section of the aperture of the workpiece 3, according to the relative position relationship between the grinding wheel 4 and the measuring probe ball b12, the quick tool setting of the grinding wheel 4 is completed by utilizing acoustic emission, and the coordinate values (Xdirection and Zdirection coordinate values) of the grinding wheel 4 in the machine tool coordinate system at the moment are recorded_{3},Z_{3}) And controls the Xaxis workbench 8 and the Zaxis workbench 2 of the machine tool to rapidly move to an Xdirection safety position X_{0}And Zdirection safety position Z_{1}。
S6, judging the machining allowance delta_{0}＝D_{0}+EID_{min}If > 0.5mm is true, yes, go to step S7, no, go to step S11, where D is_{0}Is the nominal aperture of the workpiece 3 and EI is the lower deviation of the aperture.
S7, starting the workpiece spindle motor 15 to drive the workpiece 3 to rotate to a working rotating speed through the threejaw chuck 13, simultaneously starting the grinding wheel spindle to the working rotating speed, adopting rough machining parameters, wherein the maximum allowable bending deformation of the grinding rod of the embodiment is 0.7mm, and controlling the Xaxis workbench 8 of the machine tool to apply the prepressing amount Xa of the grinding rod 7_{p0}At this time, the preload amount Xa_{p0}＝0.5mm。
S8, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}20 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}23 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}Recording the number of grinding cycles n in the rough machining stage_{1}Wherein L is the length of the inner hole of the workpiece 3, Δ b_{1}＝1/5B，Δb_{2}B is the width of the grinding wheel 4.
S10, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{1}。
S11, judging that the machining allowance is more than delta and 0.1mm_{1}＝D_{0}+EID_{1}If not more than 0.5mm is established, if yes, step S12 is executed, and if no, step S8 is executed.
S12, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting semifinishing parameters_{p0}At this time, the preload amount Xa_{p0}＝0.25mm。
S13, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{ } _{p}12 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}12 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}Recording the number n of grinding cycles in the semifinishing stage_{2}。
S15, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{2}。
S16, judging that the machining allowance is more than delta and 0.01mm_{2}＝D_{0}+EID_{2}If not more than 0.1mm is true, if yes, step S17 is executed, and if no, step S13 is executed.
S17, controlling the Xaxis workbench 8 of the machine tool to apply the prepressing amount Xa of the grinding rod 7 by adopting the finish machining parameters_{p0}At this time, the preload amount Xa_{p0}＝0.18mm。
S18, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{ } _{p}4 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}4 μm, the Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}。
S19, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{3}。
S20, judging the machining allowance delta_{3}＝D_{0}+EID_{3}If not greater than 0.01mm, if yes, go to step S21, if no, go to step S18.
S21, controlling the prepressing amount Xa of the grinding rod 7 applied by the Xaxis workbench 8 of the machine tool by adopting the final stage processing parameters_{p0}At this time, the preload amount Xa_{p0}＝0.08mm。
S22, controlling the feeding depth a of the Xaxis workbench 8 of the machine tool_{p}1 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min in Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable 8 of the machine tool to feed the cutting depth a_{p}1 μm, Zaxis table 2 has a reciprocating speed f_{a}160mm/min to Z coordinate Z_{0}+L+Δb_{1}。
S23, measuring the aperture of each section of the workpiece 3 by using the measuring pin 10, and recording the minimum aperture as D_{4}。
S24, judgment D_{0}+EI≤D_{4}≤D_{0}If + ES is established, if yes, step S25 is executed, and if no, step S22 is executed.
S25, controlling the Xaxis workbench 8 of the machine tool to rapidly move to the Xdirection safety position X_{0}Zaxis workbench 2 rapidly moves to Zdirection safety position Z_{1}And finishing the grinding processing.
Grinding wheel reciprocating grinding in rough machining stageAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; grinding wheel reciprocating grinding in semifinishing stageAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; finish machiningStaged grinding wheel reciprocating grindingAfter the next time (wherein N is the maximum integer), carrying out grinding wheel dressing; grinding wheel reciprocating grinding in final machining stageAnd (4) performing grinding wheel dressing after the times (wherein N is the maximum integer), and compensating the grinding wheel dressing amount of each stage into the Xdirection feeding coordinate of the machine tool.
The present invention is not limited to the embodiment, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention, and all the equivalents and modifications thereof are covered by the protection scope of the present invention.
Claims (1)
1. The integrated machining method for measuring and grinding the hole with the large depthdiameter ratio is characterized by comprising the following steps of:
s1, starting the machine tool, installing the workpiece and the grinding wheel, and confirming that the working state and the processing program of the machine tool are normal;
s2, controlling the Zaxis workbench of the machine tool to rapidly move to a Zdirection safety position coordinate Z_{1}＝Z_{0}180, wherein Z_{0}When the right end face of the grinding wheel is contacted with the left end face of the workpiece, the Zaxis raster coordinate value of the machine tool, namely Z_{0}Is a zero point of the workpiece in the Z direction;
s3, controlling the Xaxis workbench of the machine tool to rapidly move to the Xdirection safe position coordinate X_{0}，X_{0}When the rotation center of the workpiece is coincident with the axis of the grinding rod, the Xaxis raster coordinate value of the machine tool is obtained;
s4, pore diameter measurement: controlling the Xaxis workbench and the Zaxis workbench of the machine tool to move, measuring the aperture of each section of the workpiece by using the measuring needle, recording Xdirection and Zdirection coordinates of a ball head of the measuring needle at the corresponding aperture in a machine tool coordinate system, and taking the minimum value D in the measured apertures_{min}And the coordinate (X) of the ball of the stylus at its corresponding position in the machine coordinate system_{2},Z_{2})；
S5, tool setting of a grinding wheel: at the smallest cross section of the workpiece apertureAccording to the relative position relationship between the grinding wheel and the probe ball, the quick tool setting of the grinding wheel is completed by utilizing acoustic emission, and the coordinate values (Xdirection and Zdirection) of the grinding wheel in the machine tool coordinate system at the moment are recorded_{3},Z_{3}) And controlling the Xaxis workbench and the Zaxis workbench of the machine tool to rapidly move to an Xdirection safety position X_{0}And Zdirection safety position Z_{1}；
S6, judging the machining allowance delta_{0}＝D_{0}+EID_{min}If > 0.5mm is true, yes, go to step S7, no, go to step S11, where D is_{0}Is the nominal aperture of the workpiece, and EI is the lower deviation of the aperture;
s7, starting a workpiece spindle motor to drive a workpiece to rotate to a working rotating speed through a threejaw chuck, simultaneously starting a grinding wheel spindle to the working rotating speed, adopting rough machining parameters, wherein Xs is the maximum bending deformation allowed when the grinding rod is safely used, and controlling the prepressing amount of the grinding rod applied to the Xaxis workbench of the machine tool to be Xa_{p0}，2/3Xs＜Xa_{p0}≤Xs；
S8, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，20μm＜a_{p}Less than or equal to 30 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number of grinding cycles n in the rough machining stage_{1}Wherein L is the length of the inner hole of the workpiece, and delta b is more than or equal to 0_{1}≤1/2B，1/2B≤Δb_{2}B is not more than B, B is the width of the grinding wheel, f is not less than 100mm/min_{a}≤200mm/min；
S9, judgmentYES, go to step S10, NO, go to step S8, where N_{1}1, 2 and 3 …, the concrete value is determined according to the grinding rod prepressing Xa of the rough machining stage_{p0}Cutting depth a_{p}And a machining allowance delta_{0}Determining;
s10, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{1}；
S11, judging that the machining allowance is more than delta and 0.1mm_{1}＝D_{0}+EID_{1}If the thickness is less than or equal to 0.5mm, if yes, executing the step S12, and if not, executing the step S8;
s12, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting semifinishing parameters_{p0}，1/3Xs＜Xa_{p0}≤2/3Xs；
S13, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，10μm＜a_{p}Less than or equal to 20 mu m, the reciprocating speed f of the Zaxis worktable_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，10μm＜a_{p}Less than or equal to 20 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}Recording the number n of grinding cycles in the semifinishing stage_{2}；
S14, judgmentYES in step S15, NO, go to step S13, where N_{2}1, 2 and 3 …, the concrete value is according to the grinding rod prepressing amount Xa of the semifinishing stage_{p0}Cutting depth a_{p}And a machining allowance delta_{1}Determining;
s15, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{2}；
S16, judging that the machining allowance is more than delta and 0.01mm_{2}＝D_{0}+EID_{2}If the thickness is less than or equal to 0.1mm, if yes, executing the step S17, and if not, executing the step S13;
s17, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting the finish machining parameters_{p0}，1/4Xs＜Xa_{p0}≤1/3Xs；
S18, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，2μm＜a_{p}Less than or equal to 10 mu m, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}；
S19, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{3}；
S20, judging the machining allowance delta_{3}＝D_{0}+EID_{3}If the thickness is less than or equal to 0.01mm, if yes, executing the step S21, and if not, executing the step S18;
s21, controlling the prepressing amount Xa of the grinding rod applied by the Xaxis workbench of the machine tool by adopting the final stage machining parameters_{p0}，0≤Xa_{p0}≤1/4Xs；
S22, controlling the feeding depth a of the Xaxis workbench of the machine tool_{p}，0＜a_{p}Less than or equal to 2 microns, the reciprocating speed f of the Zaxis worktable_{a}In the Zdirection coordinate Z_{0}+Δb_{2}Then controlling the Xaxis worktable of the machine tool to feed the cutting depth a_{p}，0＜a_{p}Less than or equal to 2 microns, the reciprocating speed f of the Zaxis worktable_{a}Moving to Z coordinate Z_{0}+L+Δb_{1}；
S23, measuring the aperture of each section of the workpiece by using a measuring pin, and recording the minimum aperture as D_{4}；
S24, judgment D_{0}+EI≤D_{4}≤D_{0}If + ES is established, if yes, step S25 is executed, if no, step S22 is executed;
s25, controlling the Xaxis workbench of the machine tool to rapidly move to the Xdirection safety position X_{0}Zaxis workbench rapidly moves to Zdirection safety position Z_{1}Finishing grinding processing;
determining the number of grinding cycles for which the grinding wheel has reached wear in different stages of grindingWherein N is the maximum integer, G is the grinding ratio determined by the process test according to the grinding wheel and the processed workpiece material, v_{Grinding wheel}D is the abrasion loss of the grinding wheel_{min}、D_{1}、D_{2}、D_{3}，a_{p}Cutting depth corresponding to each processing stage; the grinding wheel is dressed after being worn, and the grinding wheel dressing amount b is compensated into the Xdirection feeding coordinate of the machine tool.
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