CN111571320B - Micro-removal approximation method for correcting unbalance of micro-diameter milling cutter - Google Patents
Micro-removal approximation method for correcting unbalance of micro-diameter milling cutter Download PDFInfo
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- CN111571320B CN111571320B CN202010496823.3A CN202010496823A CN111571320B CN 111571320 B CN111571320 B CN 111571320B CN 202010496823 A CN202010496823 A CN 202010496823A CN 111571320 B CN111571320 B CN 111571320B
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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
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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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
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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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
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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
- 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
- B24B49/16—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 taking regard of the load
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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
- B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention discloses a micro-removal approximation method for correcting unbalance of a micro-diameter milling cutter, which comprises the following steps: (1) building a micro-removal approximation system; (2) loading the micro-diameter milling cutter into a phasing device according to the phase mark to perform approximate rotary motion; (3) positioning a lateral removal position; (4) performing approximate coarse feeding; (5) carrying out micro-feeding motion, monitoring the output of the micro-torque sensor by a control system, finishing the approximation once a micro-force signal is detected, turning the micro-diameter milling cutter to a removal phase, starting a precision removal rotating motor, and realizing a micro-removal procedure; (6) and if the approximation is not realized, returning to the initial position, starting the longitudinal macro-motion precision motion platform to perform coarse motion feeding of half stroke of the flexible hinge micro-motion workbench, and then starting the process of (4) again until the approximation is successful. The method can realize weak rigidity approximation in the correction process and large rigidity removal in the correction process, thereby realizing high resolution and high precision correction micro-removal.
Description
Technical Field
The invention belongs to the technical field of cutter manufacturing, and relates to a micro-removal approximation method for correcting unbalance of a micro-diameter milling cutter.
Background
For the ultra-precise milling of complex tiny metal parts, the requirement of the processing technical index of the surface roughness can be met only by adopting a single-crystal diamond micro-diameter milling cutter under the current technical situation to realize the nano-scale processing surface roughness. Meanwhile, in order to control the surface residual stress, the cutting deformation should be minimized during the cutting process, and thus the tool rake angle needs 0 ° or a positive rake angle. Considering the characteristics of the single crystal diamond that the machining is difficult due to the ultra-high hardness, the rake angle of the micro-diameter milling cutter of the single crystal diamond is 0 degree in order to reduce the preparation difficulty. In the actual process of manufacturing the cutter, the 0-degree front angle is realized on the tungsten steel milling cutter handle, namely, a through groove is cut on the central symmetry plane of the end part of the tungsten steel milling cutter handle to place the diamond sheet, as shown in fig. 1.
Because the center symmetry plane of the end part of the tungsten steel milling cutter handle is provided with the offset through groove, mass eccentricity exists at the end part, and the mass eccentricity can cause the micro-diameter milling cutter rotating at high speed to generate centrifugal force. When the working rotating speed of the diamond micro-diameter milling cutter is 10000-20000 rpm or above, self-excited vibration caused by centrifugal force is difficult to ignore, and particularly obvious negative effects can be brought to the surface roughness of milling processing, so that special instrument equipment is required to be adopted to calibrate and correct the unbalanced eccentric amount of the prepared diamond micro-diameter milling cutter.
The correction method is generally as follows: firstly, mounting a diamond micro-diameter milling cutter on a high-speed air-floatation main shaft, measuring and reading the unbalance amount and corresponding phase information of the micro-diameter milling cutter by using CB-8802, and storing the unbalance amount and the corresponding phase information; the method comprises the steps that a diamond micro-diameter milling cutter is detached from a high-speed air-floatation main shaft and is remounted on a spring chuck of a precise electric control rotary table, stored information is synchronously transferred to a controller of a motor of the precise rotary table to accurately position the phase of the unbalance, then a CCD optical monitoring system is matched to carry out a coarse tool setting process, then an industrial personal computer is matched with a motion controller to control a force servo macro-micro ultra-precise motion machine to carry out surface micro-force approximation (similar to the sample surface approximation process of an atomic force microscope), corresponding removing force and removing time are set according to 'process parameters', correction is automatically calculated, and finally milling and grinding correction of the unbalance is automatically completed.
Through theoretical calculation, to realize ideal dynamic balance correction of the micro-diameter milling cutter, the correction precision of the unbalance is superior to 0.002g, the precision of the phase angle is superior to 1 degree, and the grinding depth corrected by the small diamond grinding head is superior to the submicron level. The technical difficulties here are: how to approach the removal part without damage by a small diamond grinding head so as to ensure the realization of a submicron high-precision removal process. To simplify the structure, there is a contradiction: "lossless" approximation requires a weak stiffness system with low force to achieve "lossless" approximation to the surface of the object to be removed, while the removal process requires a relatively high stiffness system to ensure removal accuracy and efficiency. How to solve the contradiction is the key for realizing the micro-removal of the unbalance correction of the micro-diameter milling cutter, so that a micro-removal approximation method for correcting the unbalance of the micro-diameter milling cutter, which can solve the contradiction, is needed.
Disclosure of Invention
In order to solve the contradiction existing in the prior art, the invention provides a micro-removal approximation method for correcting unbalance of a micro-diameter milling cutter.
The purpose of the invention is realized by the following technical scheme:
a micro-removal approximation method for correcting unbalance of a micro-diameter milling cutter comprises the following steps:
(1) constructing a micro-removal approximation system:
the micro-removal approximation system comprises a system base platform, a rotary positioning and rotary approximation device and a correction removal device;
the rotary positioning and rotary approaching device comprises a rotary positioning and rotary approaching support frame body, a rotary positioning and rotary approaching motor and a micro-torque sensor;
the rotary positioning and rotary approaching support frame body is fixed on the system foundation platform;
the rotary positioning and rotary approximation motor is arranged on the rotary positioning and rotary approximation support frame body and used for positioning, removing and correcting a phase and carrying out a micro-torsion approximation test;
the rotary positioning and rotary approaching motor and the micro-torque sensor form a phasing device;
the micro-torque sensor is arranged on the rotary positioning and rotary approaching motor and used for detecting micro force during approaching, a spring chuck is arranged on the micro-torque sensor, and a diamond micro-milling cutter (removed correcting object) to be corrected is clamped on the spring chuck;
the correcting and removing device comprises a transverse precise motion platform, a longitudinal macro-motion precise motion platform, a flexible hinge micro-motion workbench, a precise removing rotary motor, a diamond small grinding head and a micro-vision system;
the transverse precise motion platform is arranged on the system base platform and used for adjusting a transverse removal correction position;
the longitudinal macro precise motion platform is arranged on the transverse precise motion platform and used for macro positioning during removal, and a micro-vision system is arranged in the vertical direction of the longitudinal macro precise motion platform;
the flexible hinge micro-motion workbench is arranged on the longitudinal macro-motion precision motion platform and is used for removing high-rigidity precision micro-motion feed during correction;
the precise removal rotating motor is arranged on the flexible hinge micro-motion workbench, a pneumatic chuck is arranged on the precise removal rotating motor, and a diamond small grinding head (removal correction tool) is clamped on the pneumatic chuck;
(2) loading the diamond micro milling cutter to be corrected with the determined removal amount into a phasing device consisting of a rotary positioning and rotary approximation motor and a micro torque sensor according to a phase mark, and driving the micro torque sensor and the diamond micro milling cutter to be corrected to perform approximation rotary motion by the rotary positioning and rotary approximation motor;
(3) performing transverse adjustment by a transverse precision motion platform, and positioning a transverse removal position;
(4) the longitudinal macro-motion precise motion platform drives the flexible hinge micro-motion workbench, the precise removal rotating motor and the small diamond grinding head, the small diamond grinding head performs approximate rough-motion feeding on the diamond micro-milling cutter to be corrected, and the diamond micro-milling cutter is observed by a micro-vision system until the diamond micro-milling cutter approaches visually (the distance is generally less than 1 mm);
(5) the flexible hinge micro-motion workbench is started to carry out micro-feeding motion, the control system monitors the output of the micro-torque sensor, once a micro-force signal (about 20 mu Nm) is detected, the approximation is completed, at the moment, the diamond micro-milling cutter to be corrected is rotated to a removal phase by the rotary positioning and rotary approximation motor, the precision removal rotary motor is started to remove grinding, and the flexible hinge micro-motion workbench is fed to realize a micro-removal program, wherein: the approaching force measuring direction is orthogonal to the removing grinding direction;
(6) and (5) if the approach cannot be realized in the precision feeding stroke of the flexible hinge micro-motion workbench, the flexible hinge micro-motion workbench returns to the initial position, the longitudinal macro-motion precision motion platform is started to perform rough feeding of half stroke of the flexible hinge micro-motion workbench, and then the process is started again until the approach is successful.
Compared with the prior art, the invention has the following advantages:
in the invention, the approaching force measuring direction is orthogonal (vertical) to the removing and grinding direction, so that the weak rigidity approaching in the correction process and the large rigidity removing requirement in the correction process can be simultaneously realized, and the high-resolution and high-precision correction micro-removal is realized.
Drawings
FIG. 1 shows a tungsten steel milling cutter handle and a natural diamond sheet;
FIG. 2 is a schematic structural diagram of a dynamic balance correction system of the micro-diameter milling cutter;
FIG. 3 is a schematic structural diagram of a dynamic balance correction system of the micro-diameter milling cutter;
fig. 4 shows the modified micro-diameter milling cutter.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides a micro-removal approximation system for correcting unbalance of a micro-diameter milling cutter, which comprises a system base platform 1, a rotary positioning and rotary approximation device and a correction removal device, as shown in figures 2 and 3;
the rotary positioning and rotary approaching device comprises a rotary positioning and rotary approaching support frame body 2, a rotary positioning and rotary approaching motor 3 and a micro-torque sensor 4;
the rotary positioning and rotary approaching support frame body 2 is fixed on the system foundation platform 1;
the rotary positioning and rotary approaching motor 3 is arranged on the rotary positioning and rotary approaching support frame body 2 and is used for positioning, removing and correcting a phase and carrying out a micro-torsion approaching test;
the rotary positioning and rotating approaching motor 3 and the micro-torque sensor 4 form a phasing device;
the micro torque sensor 4 is arranged on the rotary positioning and rotary approaching motor 3 and is used for detecting micro force during approaching, a spring chuck is arranged on the micro torque sensor 4, and a diamond micro milling cutter 5 to be corrected (a corrected object is removed) is clamped on the spring chuck;
the correcting and removing device comprises a transverse precise motion platform 6, a longitudinal macro-motion precise motion platform 7, a flexible hinge micro-motion workbench 8, a precise removing rotating motor 9, a diamond small grinding head 10 and a micro-vision system;
the transverse precise motion platform 6 is arranged on the system base platform 1 and is used for adjusting a transverse removal correction position;
the longitudinal macro precise motion platform 7 is arranged on the transverse precise motion platform 6 and used for macro positioning during removal, and a micro-vision system is arranged in the vertical direction of the longitudinal macro precise motion platform 7;
the flexible hinge micro-motion workbench 8 is arranged on the longitudinal macro-motion precision motion platform 7 and is used for removing high-rigidity precision micro-motion feeding during correction;
the precise removal rotating motor 9 is arranged on the flexible hinge micro-motion workbench 8, a pneumatic chuck is arranged on the precise removal rotating motor 9, and a small diamond grinding head 10 (removal correcting tool) is clamped on the pneumatic chuck.
In the work, system foundation platform 1, rotational positioning and rotatory approaching support body do not move, are structural support, and specific working process is as follows:
(1) the diamond micro milling cutter 5 to be corrected, which determines the removal amount, is loaded into a phasing device consisting of a rotary positioning and rotary approximation motor 3 and a micro torsion sensor 4 according to a phase mark, and the rotary positioning and rotary approximation motor 3 drives the micro torsion sensor 4 and the diamond micro milling cutter 5 to be corrected to perform approximation rotary motion;
(2) the transverse precision motion platform 6 is used for carrying out transverse adjustment to position a transverse removal position;
(3) the longitudinal macro-motion precise motion platform 7 drives the flexible hinge micro-motion workbench 8, the precise removal rotating motor 9 and the small diamond grinding head 10, the small diamond grinding head 10 performs approximate coarse-motion feeding on the diamond micro-milling cutter 5 to be corrected, and the diamond micro-milling cutter is observed by a micro-vision system until the diamond micro-milling cutter approaches visually;
(4) the flexible hinge micro-motion workbench 8 is started to carry out micro-feeding motion, the output of the micro-torque sensor 4 is monitored by the control system, once a micro-force signal is detected, the approaching is completed, the diamond micro-milling cutter 5 to be corrected is rotated to a removal phase by the rotation positioning and rotation approaching motor 3 at the moment, the rotating motor 9 is started to precisely remove grinding, and the micro-removal program is realized by the feeding of the flexible hinge micro-motion workbench 8, wherein: the approaching force measuring direction is orthogonal to the removing grinding direction;
(5) and (3) if the approach cannot be realized in the precision feeding stroke of the flexible hinge micro-motion workbench 8, the flexible hinge micro-motion workbench 8 returns to the initial position, the longitudinal macro-motion precision motion platform 7 is started again to perform coarse feeding of half stroke of the flexible hinge micro-motion workbench 8, and then the process of (4) is started again until the approach is successful.
In the invention, the micro-torsion sensor 4 is matched with TFF400 torsion sensor of FUTEK company in America, the measuring range is 0.04 N.m, the resolution ratio is 0.05%, and the approximation of a rigidity removing system to a micro-diameter milling cutter is realized by detecting micro-torsion. The rigid micro-removing system adopts a flexible hinge micro-motion workbench 8, and the radial rigidity is as follows: 35N/μm, axial stiffness: 105N/. mu.m, 50 μm stroke, 2nm resolution. The travel of the device is 100mm and the positioning precision is 5 microns by matching with a longitudinal macro-motion precision motion platform 7. The rotational positioning and the rotational approximation motor 3 have a repeated positioning accuracy of 0.005 °. The maximum rotational speed of the precision removal rotating electrical machine 9 was 12000 rpm. The system realizes the set technical index requirement and proves the practicability of the approaching system. The modified micro-diameter milling cutter is shown in fig. 4.
Claims (8)
1. A micro-removal approximation method for correcting unbalance of a micro-diameter milling cutter is characterized by comprising the following steps:
(1) constructing a micro-removal approximation system:
the micro-removal approximation system comprises a system base platform, a rotary positioning and rotary approximation device and a correction removal device;
the rotary positioning and rotary approaching device comprises a rotary positioning and rotary approaching support frame body, a rotary positioning and rotary approaching motor and a micro-torque sensor;
the rotary positioning and rotary approaching support frame body is fixed on the system foundation platform;
the rotary positioning and rotary approximation motor is arranged on the rotary positioning and rotary approximation support frame body and used for positioning, removing and correcting a phase and carrying out a micro-torsion approximation test;
the rotary positioning and rotary approaching motor and the micro-torque sensor form a phasing device;
the micro torque force sensor is arranged on the rotary positioning and rotary approaching motor and used for detecting micro force during approaching, a spring chuck is arranged on the micro torque force sensor, and a diamond micro milling cutter to be corrected is clamped on the spring chuck;
the correcting and removing device comprises a transverse precise motion platform, a longitudinal macro-motion precise motion platform, a flexible hinge micro-motion workbench, a precise removing rotary motor, a diamond small grinding head and a micro-vision system;
the transverse precise motion platform is arranged on the system base platform and used for adjusting a transverse removal correction position;
the longitudinal macro precise motion platform is arranged on the transverse precise motion platform and used for macro positioning during removal, and a micro-vision system is arranged in the vertical direction of the longitudinal macro precise motion platform;
the flexible hinge micro-motion workbench is arranged on the longitudinal macro-motion precision motion platform and is used for removing high-rigidity precision micro-motion feed during correction;
the precise removal rotating motor is arranged on the flexible hinge micro-motion workbench, a pneumatic chuck is arranged on the precise removal rotating motor, and a diamond small grinding head is clamped on the pneumatic chuck;
(2) loading the diamond micro milling cutter to be corrected with the determined removal amount into a phasing device consisting of a rotary positioning and rotary approximation motor and a micro torque sensor according to a phase mark, and driving the micro torque sensor and the diamond micro milling cutter to be corrected to perform approximation rotary motion by the rotary positioning and rotary approximation motor;
(3) performing transverse adjustment by a transverse precision motion platform, and positioning a transverse removal position;
(4) the longitudinal macro-motion precise motion platform drives the flexible hinge micro-motion workbench, the precise removal rotating motor and the small diamond grinding head, the small diamond grinding head performs approximate rough-motion feeding on the diamond micro-milling cutter to be corrected, and the diamond micro-milling cutter is observed by a micro-vision system until the diamond micro-milling cutter approaches visually;
(5) the flexible hinge micro-motion workbench is started to carry out micro-feeding motion, the output of the micro-torque sensor is monitored by the control system, once a micro-force signal is detected, the approaching is completed, the diamond micro-milling cutter to be corrected is rotated to the removal phase by the rotation positioning and rotation approaching motor, the rotation motor is started to be precisely removed to remove grinding, and the micro-motion workbench of the flexible hinge is fed to realize micro-removal procedures, wherein: the approaching force measuring direction is orthogonal to the removing grinding direction;
(6) and (5) if the approach cannot be realized in the precision feeding stroke of the flexible hinge micro-motion workbench, the flexible hinge micro-motion workbench returns to the initial position, the longitudinal macro-motion precision motion platform is started to perform rough feeding of half stroke of the flexible hinge micro-motion workbench, and then the process is started again until the approach is successful.
2. The method of claim 1, wherein said micro torsion sensor is selected from TFF400 torsion sensors of FUTEK corporation of america with a range of 0.04N · m and a resolution of 0.05%.
3. The method of claim 1, wherein the flexible hinge micro-motion stage has a radial stiffness of 35N/μm, an axial stiffness of 105N/μm, a stroke of 50 μm, and a resolution of 2 nm.
4. The method according to claim 1, wherein the stroke of the longitudinal macro-motion precision motion platform is 100mm, and the positioning precision is 5 μm.
5. The method of claim 1, wherein the rotational positioning and rotational approximation motor has a repeated positioning accuracy of 0.005 °.
6. The method of approaching micro-removal for correcting unbalance of a micro-radius milling cutter according to claim 1, wherein the maximum rotation speed of the precision removal rotating motor is 12000 rpm.
7. The method for approaching micro-removal for correcting the unbalance amount of the micro-diameter milling cutter according to claim 1, wherein in the step (4), the distance between the small diamond grinding head and the diamond micro-milling cutter to be corrected is less than 1 mm.
8. The minor diameter mill unbalance amount correction micro removal approximation method according to claim 1, wherein in the step (5), the micro force signal is 20 μ Nm.
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DE2647148C3 (en) * | 1976-10-19 | 1979-04-05 | Feinmechanik Michael Deckel, 8120 Weilheim | Tool grinding machine |
JP2739312B1 (en) * | 1997-02-06 | 1998-04-15 | 株式会社ビック.ツール | Automatic drill polishing machine |
CN103612168B (en) * | 2013-11-12 | 2016-06-01 | 广州市技师学院 | For the small-sized six-axis linkage Sharpening device of milling cutter |
CN108284388B (en) * | 2017-12-26 | 2019-09-27 | 华中科技大学 | A kind of intelligent Force control grinding and polishing apparatus of vision guide |
CN108262649B (en) * | 2018-01-17 | 2019-11-22 | 沈阳航空航天大学 | A kind of appraisal procedure of cutter single maximum reconditioning thickness |
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