CN110614588B - Rotary polishing device and method for polishing blind holes - Google Patents
Rotary polishing device and method for polishing blind holes Download PDFInfo
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- CN110614588B CN110614588B CN201910984160.7A CN201910984160A CN110614588B CN 110614588 B CN110614588 B CN 110614588B CN 201910984160 A CN201910984160 A CN 201910984160A CN 110614588 B CN110614588 B CN 110614588B
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- abrasive particle
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- air
- clamping head
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- 238000005498 polishing Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 116
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000000605 extraction Methods 0.000 claims abstract description 44
- 239000006061 abrasive grain Substances 0.000 claims description 31
- 238000009434 installation Methods 0.000 claims description 22
- 238000003754 machining Methods 0.000 claims description 22
- 238000009423 ventilation Methods 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000010146 3D printing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007517 polishing process Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 210000003709 heart valve Anatomy 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a rotary polishing device and a method for polishing blind holes, wherein the rotary polishing device comprises a workbench, a movable positioning assembly, a runner assembly and a rotary clamping assembly, wherein the movable positioning assembly comprises a horizontal module mounting frame, a horizontal linear module, a horizontal module driving motor, a vertical linear module and a vertical module driving motor, the rotary clamping assembly comprises a rotary motor, a motor mounting seat, a bearing, a supporting block, a secondary clamping head and a vertical mounting seat, and the runner assembly comprises a main clamping head, a rotary joint fixing seat, a runner fixing plate, a sliding rail connecting plate, an extraction opening one-way valve, a gas-liquid abrasive particle flow joint, an abrasive particle inflow opening valve, a gas-compressing opening one-way valve, a runner joint, a flange type rotary joint and a main clamping end O-shaped ring; according to the invention, the blind holes of the blind hole type workpieces can be polished, and the workpieces to be processed are driven to rotate by the rotating motor during processing, so that abrasive particle flows can be more disordered to collide with the inner walls of the blind holes during processing, and the processing efficiency of the blind holes is improved.
Description
Technical Field
The invention relates to the field of abrasive particle flow polishing, in particular to a rotary polishing device for blind hole polishing and a method thereof, wherein the rotary polishing device utilizes periodical positive and negative pressure to enable abrasive particle flow to impact a rotary workpiece.
Background
The 3D printing technology is also called additive manufacturing technology, namely an advanced manufacturing technology called rapid forming in China, and the essential principle is dispersion and accumulation, namely, the manufacturing of a three-dimensional entity is converted into accumulation of two-dimensional layers and continuous superposition along the forming direction by slicing a solid model with the aid of a computer, so that the manufacturing of the three-dimensional entity is finally realized. As 3D printing technology is used more and more widely, blind hole products generated by using the 3D printing technology are more and more generated. The blind holes refer to blind holes which are not communicated with the through holes, so that the blind holes are widely applied to life and industrial production, and meanwhile, the high-precision blind holes are increasingly widely used, such as blind holes of pressure sensor shells; key parts in the vehicle engine such as a plunger, an electromagnetic valve seat, an intermediate body of an oil sprayer, a blind hole of a pump body and the like are used for realizing the efficient operation of the engine; blind holes in prosthetic heart valve holders in medical applications.
Although 3D printing technology is better and better, the fineness is high, the surface of a model printed by 3D is rough. In order to solve the problem of surface roughness, the traditional post-treatment methods adopt mechanical polishing, surface sand blasting and the like, but the traditional methods are easy to destroy the shape required by the parts, dust generated in the polishing process affects the environment and processing workers, and the traditional polishing method cannot polish blind hole type workpieces with small apertures printed in 3D (three-dimensional) mode, in particular blind holes of the blind hole type workpieces.
Disclosure of Invention
The invention aims to solve the problem that the existing polishing method cannot polish blind holes printed by a 3D printing technology, and provides a rotary polishing device and a rotary polishing method for polishing blind holes.
The invention realizes the above purpose through the following technical scheme: a rotary polishing device for polishing blind holes comprises a workbench, a movable positioning assembly, a runner assembly and a rotary clamping assembly;
the movable positioning assembly comprises a horizontal module mounting frame, a horizontal linear module, a horizontal module driving motor, a vertical linear module and a vertical module driving motor, wherein the horizontal module mounting frame is fixed on the workbench; the horizontal linear module is horizontally fixed on the horizontal module mounting frame, the horizontal module driving motor is fixed at one end of the horizontal linear module, and a driving shaft of the horizontal module driving motor is connected with the horizontal linear module and drives a horizontal sliding block on the horizontal linear module to do linear motion along the horizontal direction; the vertical module driving motor is vertically fixed on the workbench, the vertical linear module is vertically fixed at the upper end of the vertical module driving motor, and a driving shaft of the vertical module driving motor is connected with the vertical linear module and drives a vertical sliding block on the vertical linear module to do linear motion along the vertical direction; the runner assembly is arranged on a horizontal sliding block of the horizontal linear module, and the rotary clamping assembly is arranged on a vertical sliding block of the vertical linear module; the rotary clamping assembly and the runner assembly are arranged on the same side of the horizontal linear module;
the rotary clamping assembly comprises a rotary motor, a motor mounting seat, a bearing, a supporting block, a secondary clamping head and a vertical mounting seat, wherein the vertical mounting seat is fixed on a vertical sliding block, the supporting block is fixed on the vertical mounting seat, and an inclined downward mounting inclined surface is arranged on the supporting block; the mounting inclined plane is provided with a circular groove for mounting the auxiliary clamping head; the support block is also provided with a motor mounting groove for mounting a rotating motor, the rotating motor is fixed in the motor mounting groove of the support block through a motor mounting seat, the bottom of the motor mounting groove is provided with a bearing hole communicated with the circular groove, the bearing is embedded in the bearing hole, and an output shaft of the rotating motor penetrates through the bearing and is fixedly connected with the bottom of a secondary clamping head arranged in the circular groove;
the runner assembly comprises a main clamping head, a rotating joint fixing seat, a runner fixing plate, a sliding rail connecting plate, an extraction opening one-way valve, a gas-liquid abrasive particle flow joint, an abrasive particle inflow opening valve, a gas-compressing opening one-way valve, a runner joint, a flange-type rotating joint and a main clamping end O-shaped ring, wherein the sliding rail connecting plate is vertically arranged on a horizontal sliding block of the horizontal linear module; one end of the flange type rotary joint, which is close to the rotary clamping assembly, is a rotary end of the flange type rotary joint, a flange plate is arranged on the rotary end of the flange type rotary joint, the main clamping head is arranged on the flange plate of the rotary end of the flange type rotary joint, two ends of a workpiece to be processed are respectively clamped through the main clamping head and the auxiliary clamping head, and a blind hole of the workpiece to be processed is positioned at one end of the main clamping head; the other end of the flange type rotary joint is a fixed end of the flange type rotary joint, the flange type rotary joint is connected with a gas-liquid abrasive particle flow joint through a runner joint, the gas-liquid abrasive particle flow joint is provided with three inlets and outlets which are an abrasive particle inflow port end, an abrasive particle outflow port end and a ventilation end respectively, the abrasive particle inflow port end, the abrasive particle outflow port end and the ventilation end are mutually communicated, the abrasive particle outflow port end of the gas-liquid abrasive particle flow joint is connected with the runner joint, the abrasive particle inflow port end of the gas-liquid abrasive particle flow joint is connected with an external abrasive particle flow generating device through an abrasive particle inflow port valve and an abrasive particle flow pipeline, and the ventilation end of the gas-liquid abrasive particle flow joint is connected with a pumping T-shaped joint; the suction gas T-shaped connector is provided with an extraction opening, a pressure air opening and a ventilation opening, the extraction opening, the pressure air opening and the ventilation opening are communicated with each other, the ventilation opening of the suction gas T-shaped connector is connected with the ventilation end of the gas-liquid abrasive particle flow connector, the extraction opening of the suction gas T-shaped connector is connected with an external air extraction device through an extraction opening one-way valve and an air extraction pipeline, and the air compression opening of the suction gas T-shaped connector is connected with the external air compression device through an air compression opening one-way valve and an air compression pipeline; the ventilation end of the gas-liquid abrasive particle flow joint is positioned above the abrasive particle inflow end.
Further, the main clamping head comprises a flange-shaped fixed flange end and a main mounting end for fixing a workpiece to be machined, the fixed flange end of the main clamping head is fixedly connected with a flange plate of a rotating end of the flange-type rotary joint through bolts, a workpiece mounting main groove matched with the machining end of the workpiece to be machined is formed in the main mounting end of the main clamping head, the machining end of the workpiece to be machined is mounted in the workpiece mounting main groove, a main clamping end O-shaped ring for preventing the machining end of the workpiece to be machined from sliding is arranged in the workpiece mounting main groove of the main clamping head, an inner ring of the main clamping end O-shaped ring is attached to and sleeved on the machining end of the workpiece to be machined, and an outer ring of the main clamping end O-shaped ring is attached to the inner wall of the workpiece mounting main groove; the auxiliary clamping head comprises a cylindrical fixed end and an auxiliary mounting end used for fixing a workpiece to be machined, the fixed end of the auxiliary clamping head is fixedly mounted on an output shaft of the rotating motor, a workpiece mounting auxiliary groove matched with the rear end of the workpiece to be machined is formed in the auxiliary mounting end of the auxiliary clamping head, the rear end of the workpiece to be machined is mounted in the workpiece mounting auxiliary groove, an auxiliary clamping end O-shaped ring used for preventing the workpiece to be machined from sliding is arranged at the bottom of the workpiece mounting auxiliary groove of the auxiliary clamping head, an inner ring of the auxiliary clamping end O-shaped ring is attached to and sleeved on the rear end of the workpiece to be machined, and an outer ring of the auxiliary clamping end O-shaped ring is attached to the inner wall of the workpiece mounting auxiliary groove.
Further, the vertical module driving motor is fixed on the workbench through a vertical module mounting seat. The vertical module driving motor is fixed on the vertical module installation seat through bolts, and the vertical module installation seat is fixed on the workbench through bolts. One end of the horizontal linear module is provided with four bolt holes, the horizontal module driving motor is provided with four bolt holes matched with the bolt holes on the horizontal linear module, and the horizontal linear module is fixed through four fixing bolts penetrating through the bolt holes.
Further, the gas-liquid abrasive particle flow connector is a square connector, and the gas-liquid abrasive particle flow connector is fixed on the sliding rail connecting plate.
Further, the rotary joint fixing seat comprises a flange type rotary joint fixing base and a flange type rotary joint fixing upper seat, arc grooves matched with the flange type rotary joint are formed in the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat, the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat clamp the flange type rotary joint together, and the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat are fixedly connected through bolts.
Furthermore, the axial lead of the flange type rotary joint and the axial lead of the fixed end of the auxiliary clamping head are inclined at an angle of 30-60 degrees with the horizontal plane, and the axial lead of the flange type rotary joint and the axial lead of the fixed end of the auxiliary clamping head are perpendicular to the installation inclined plane of the supporting block.
Further, the supporting block is a right-angle triangular prism-shaped supporting block, two right-angle faces and an installation inclined face are arranged on the supporting block, the vertical installation seat is fixed on one right-angle face of the supporting block, and the auxiliary clamping head is installed on the installation inclined face of the supporting block.
Further, the air extracting device is an air extracting pump, and the air compressing device is an air compressor.
A rotary polishing method for polishing blind holes based on a rotary polishing device for polishing blind holes specifically comprises the following steps:
step one: the fixed end of a workpiece to be processed is arranged on a secondary clamping head through a secondary clamping end O-shaped ring;
step two: starting a vertical module driving motor, driving a rotary clamping assembly and a rotary clamping assembly for clamping a workpiece to be processed to move downwards by driving a vertical sliding block on a vertical linear module to move downwards in a linear manner, and stopping the vertical module driving motor when the vertical sliding block reaches a proper height;
step three: starting a horizontal module driving motor, driving a runner assembly connected with a horizontal sliding block to move towards a workpiece to be processed by driving the horizontal sliding block on the horizontal linear module to horizontally move, and stopping the horizontal module driving motor after the proper position is reached;
step four: repeating the second step and the third step, so that the workpiece to be machined and the main clamping head on the horizontal linear module are gradually close to each other until the machining end of the workpiece to be machined completely stretches into the main clamping head, and the O-shaped ring at the main clamping end in the main clamping head completely sleeves the machining end of the workpiece to be machined, and at the moment, the workpiece to be machined is clamped by the main clamping head and the auxiliary clamping head together, and the blind hole of the workpiece to be machined is communicated with the flange-type rotary joint;
step five: opening the abrasive particle flow generating device, the air extracting device and the air compressing device;
step six: closing the abrasive grain inflow port valve and the air inlet check valve, opening the air extraction port check valve, and performing air extraction by connecting the air extraction device with the air extraction port check valve through an air extraction pipeline, so that the blind hole of the workpiece to be processed and the inside of the flange type rotary joint are in a negative pressure state;
step seven: closing the air suction port one-way valve, keeping the air pressure port one-way valve closed and opening the abrasive grain inflow port valve, so that abrasive grain flow generated in the abrasive grain flow generating device flows through the abrasive grain inflow port valve and the gas-liquid abrasive grain flow joint to enter the flange type rotary joint, and the abrasive grain flow flows into the blind hole of the workpiece to be processed because the blind hole of the workpiece to be processed and the flange type rotary joint are both in a negative pressure state;
step eight: closing the abrasive grain inflow port valve, and enabling abrasive grain flow in the blind hole of the workpiece to be processed to flow backwards under the action of gravity;
step nine: the air pumping device comprises a suction port check valve, an air compressing device, a flange type rotary joint, a suction T-shaped joint, an air-liquid abrasive particle flow joint, a blind hole, a rotary joint and a rotary joint, wherein the suction port check valve is closed;
step ten: opening a rotating motor, wherein the rotating motor drives a workpiece to be processed, the main clamping head and the rotating end of the flange type rotating joint to rotate together through the auxiliary clamping head;
step eleven: closing the air pressing port check valve, opening the air extraction port check valve, and extracting air in the flange type rotary joint by using the air extraction device, so that the abrasive particle flow rapidly flows out of the blind hole under the gravity and the acting force generated by the air extraction device, and the air exchange end of the air-liquid abrasive particle flow joint is positioned above the air exchange end of the abrasive particle inflow port, so that the abrasive particle flow cannot be extracted from the air exchange end of the air-liquid abrasive particle flow joint when the air extraction device extracts air;
step twelve: opening the one-way valve of the air suction port and the one-way valve of the air compression port in turn rapidly, namely rapidly repeating the step nine and the step eleven, so that the abrasive particle flow circularly enters and exits the blind hole of the workpiece to be processed under the action of periodical air suction and compression until the blind hole polishing of the workpiece to be processed is completed;
step thirteen: after the machining is finished, the rotating motor is firstly closed, then the air compressing opening one-way valve and the abrasive grain inflow port valve are opened, the air extracting opening one-way valve, the air extracting device, the air compressing device and the abrasive grain flow generating device are closed, abrasive grain flows in the blind hole and the flange type rotating joint flow back to the abrasive grain flow generating device through the abrasive grain inflow port valve, then the air compressing opening one-way valve and the air compressing device are closed, the horizontal module driving motor and the vertical module driving motor are sequentially started, the runner assembly is separated from the rotating clamping assembly, the workpiece to be machined and the rotating clamping assembly are taken down, and the whole machining operation is completed.
The invention has the beneficial effects that:
1. according to the invention, the blind holes of the blind hole type workpiece can be polished, and the blind holes of the workpiece to be polished are in a negative pressure state by exhausting, so that abrasive particle flows can smoothly enter the blind holes.
2. In the polishing process, the abrasive particle flow repeatedly impacts the blind hole of the workpiece, so that the polishing efficiency is faster, the effect is better, the micro cutting is performed, and the mechanical deformation of the surface of the workpiece is avoided.
3. The invention uses a small amount of abrasive particle flow in the polishing process, and the abrasive particle flow is nontoxic, has higher safety, small pollution and is environment-friendly.
4. The invention utilizes the movable positioning assembly formed by the horizontal linear module and the vertical linear module to carry out movable positioning, and can realize accurate positioning in space too quickly and accurately.
5. According to the invention, the workpiece to be processed is obliquely arranged on the right-angle triangular prism-shaped supporting block, and the blind hole of the workpiece to be processed has a certain inclination angle, so that the movement of abrasive particle flow entering the blind hole during polishing is more disordered, and the polishing effect is better.
6. According to the polishing device, the orifice of the workpiece to be processed is inclined downwards, so that abrasive particle flow in the air extraction stage of the polishing process flows backwards under the action of gravity and the action of the action force generated by air extraction.
7. According to the invention, during processing, the rotary motor is utilized to drive the auxiliary clamping head, the workpiece to be processed, the main clamping head and the rotary end of the flange type rotary joint to jointly rotate, so that abrasive particle flow can be more disordered during processing and collide with the inner wall of the blind hole, and the processing efficiency of the blind hole is improved.
Drawings
Fig. 1 is a schematic view showing the overall structure of a rotary polishing apparatus for blind hole polishing according to the present invention.
FIG. 2 is a schematic view of the overall structure of the mobile positioning assembly of the present invention.
FIG. 3 is a schematic view of the flow channel assembly of the present invention.
Fig. 4 is a schematic three-dimensional view of one angle of the gas-liquid abrasive flow joint and suction gas T-joint of the present invention.
Fig. 5 is a schematic three-dimensional view of another angle of the gas-liquid abrasive flow joint and suction gas T-joint of the present invention.
Fig. 6 is a schematic cross-sectional structural view of a flow path portion of a flow path assembly of the present invention.
Fig. 7 is a schematic view of the overall mechanism of the rotary clamping assembly of the present invention.
Fig. 8 is a cross-sectional view of a rotary clamp assembly of the present invention.
In the figure, the device comprises a 1-moving positioning assembly, a 2-runner assembly, a 3-rotating clamping assembly, a 4-workpiece to be processed, a 5-workbench, a 101-horizontal module mounting frame, a 102-horizontal module driving motor, a 103-horizontal sliding block, a 104-horizontal linear module, a 105-vertical linear module, a 106-vertical sliding block, a 107-vertical module driving motor, a 108-vertical module mounting seat, a 201-main clamping head, a 202-flange type rotating joint, a 203-rotating joint fixing seat, a 204-runner joint, a 205-suction opening check valve, a 206-suction gas T-shaped joint, a 207-abrasive particle inflow valve, a 208-gas-liquid abrasive particle inflow joint, a 209-air pressure opening check valve, a 210-runner fixing plate, a 211-slide connecting plate, a 212-air pressure opening, a 213-suction opening, a 214-abrasive particle inflow opening end, a 215-abrasive particle outflow end, a 216-main clamping end O-shaped ring, a 301-supporting block, a 302-rotating motor, a 303-vertical mounting seat, a 304-auxiliary clamping head, a 305-auxiliary clamping end O-shaped ring, a 306-bearing and a 307-motor mounting seat.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 8, a rotary polishing device for polishing blind holes comprises a workbench 5, a movable positioning assembly 1, a runner assembly 2 and a rotary clamping assembly 3.
The mobile positioning assembly 1 comprises a horizontal module mounting frame 101, a horizontal linear module 104, a horizontal module driving motor 102, a vertical linear module 105 and a vertical module driving motor 107, wherein the horizontal module mounting frame 101 is fixed on the workbench 5; the horizontal linear module 104 is horizontally fixed on the horizontal module mounting frame 101, the horizontal module driving motor 102 is fixed at one end of the horizontal linear module 104, and a driving shaft of the horizontal module driving motor 102 is connected with the horizontal linear module 104 and drives the horizontal sliding block 103 on the horizontal linear module 104 to do linear motion along the horizontal direction; the vertical module driving motor 107 is vertically fixed on the workbench 5, the vertical linear module 105 is vertically fixed at the upper end of the vertical module driving motor 107, and a driving shaft of the vertical module driving motor 107 is connected with the vertical linear module 105 and drives the vertical sliding block 106 on the vertical linear module 105 to do linear motion along the vertical direction; the runner assembly 2 is arranged on a horizontal sliding block 103 of the horizontal linear module 104, and the rotary clamping assembly 3 is arranged on a vertical sliding block 106 of the vertical linear module 105; the rotary clamping assembly 3 and the runner assembly 2 are arranged on the same side of the horizontal linear module 104.
The rotary clamping assembly 3 comprises a rotary motor 302, a motor mounting seat 307, a bearing 306, a supporting block 301, a secondary clamping head 304 and a vertical mounting seat 303, wherein the vertical mounting seat 303 is fixed on a vertical sliding block 106, the supporting block 301 is fixed on the vertical mounting seat 303, and an inclined downward mounting inclined surface is arranged on the supporting block 301; the installation inclined plane is provided with a circular groove for installing the auxiliary clamping head 304; the supporting block 301 is further provided with a motor mounting groove for mounting the rotating motor 302, the rotating motor 302 is fixed in the motor mounting groove of the supporting block 301 through a motor mounting seat 307, the bottom of the motor mounting groove is provided with a bearing hole communicated with the circular groove, the bearing 306 is embedded in the bearing hole, and an output shaft of the rotating motor 302 penetrates through the bearing 306 to be fixedly connected with the bottom of the auxiliary clamping head 304 mounted in the circular groove.
The runner assembly 2 comprises a main clamping head 201, a rotating joint fixing seat 203, a runner fixing plate 210, a sliding rail connecting plate 211, an extraction opening one-way valve 205, a gas-liquid abrasive particle flow joint 208, an abrasive particle inflow opening valve 207, a gas-air opening one-way valve 209, a runner joint 204, a flange type rotating joint 202 and a main clamping end O-shaped ring 216, wherein the sliding rail connecting plate 211 is vertically arranged on a horizontal sliding block 103 of the horizontal linear module 104, the runner fixing plate 210 is fixedly arranged on the sliding rail connecting plate 211, the rotating joint fixing seat 203 is fixedly arranged on the runner fixing plate 210, the flange type rotating joint 202 is arranged on the rotating joint fixing seat 203, and the axial lead of the flange type rotating joint 202 is parallel to the axial lead of an output shaft of a rotating motor 302 when the flange type rotating joint 202 is arranged; one end of the flange type rotary joint 202, which is close to the rotary clamping assembly 3, is a rotary end of the flange type rotary joint 202, a flange is arranged on the rotary end of the flange type rotary joint 202, the main clamping head 201 is arranged on the flange of the rotary end of the flange type rotary joint 202, two ends of a workpiece 4 to be machined are respectively clamped through the main clamping head 201 and the auxiliary clamping head 304, and a blind hole of the workpiece 4 to be machined is positioned at one end of the main clamping head 201; the other end of the flange-type rotary joint 202 is a fixed end of the flange-type rotary joint 202, the flange-type rotary joint 202 is connected with a gas-liquid abrasive particle flow joint 208 through a runner joint 204, the gas-liquid abrasive particle flow joint 208 is provided with three inlets and outlets, namely an abrasive particle inflow port end 214, an abrasive particle outflow port end 215 and a ventilation end, the abrasive particle inflow port end 214, the abrasive particle outflow port end 215 and the ventilation end are mutually communicated, the abrasive particle outflow port end 215 of the gas-liquid abrasive particle flow joint 208 is connected with the runner joint 204, the abrasive particle inflow port end 214 of the gas-liquid abrasive particle flow joint 208 is connected with an external abrasive particle flow generating device through an abrasive particle inflow port valve 207 and an abrasive particle flow pipeline, and the ventilation end of the gas-liquid abrasive particle flow joint 208 is connected with a suction T-shaped joint 206; the suction gas T-shaped joint 206 is provided with an extraction opening 213, an air compressing opening 212 and an air exchanging opening, the extraction opening 213, the air compressing opening 212 and the air exchanging opening are communicated with each other, the air exchanging opening of the suction gas T-shaped joint 206 is connected with the air exchanging end of the gas-liquid abrasive particle flow joint 208, the extraction opening 213 of the suction gas T-shaped joint 206 is connected with an external air extracting device through an extraction opening check valve 205 and an air extracting pipeline, and the air compressing opening 212 of the suction gas T-shaped joint 206 is connected with the external air compressing device through an air compressing opening check valve 209 and an air compressing pipeline; the ventilation end of the gas-liquid abrasive particle flow connector 208 is positioned above the abrasive particle flow inlet end 214.
The main clamping head 201 comprises a flange-shaped fixed flange end and a main mounting end for fixing the workpiece 4 to be machined, the fixed flange end of the main clamping head 201 is fixedly connected with a flange plate of a rotating end of the flange-type rotary joint 202 through bolts, a workpiece mounting main groove matched with the machining end of the workpiece 4 to be machined is formed in the main mounting end of the main clamping head 201, the machining end of the workpiece 4 to be machined is mounted in the workpiece mounting main groove, a main clamping end O-shaped ring 216 for preventing the machining end of the workpiece 4 to be machined from sliding is arranged in the workpiece mounting main groove of the main clamping head 201, an inner ring of the main clamping end O-shaped ring 216 is attached to and sleeved on the machining end of the workpiece 4 to be machined, and an outer ring of the main clamping end O-shaped ring 216 is attached to the inner wall of the workpiece mounting main groove; the auxiliary clamping head 304 comprises a cylindrical fixed end and an auxiliary installation end for fixing the workpiece 4 to be machined, the fixed end of the auxiliary clamping head 304 is fixedly arranged on an output shaft of the rotating motor, a workpiece installation auxiliary groove matched with the rear end of the workpiece 4 to be machined is formed in the auxiliary installation end of the auxiliary clamping head 304, the rear end of the workpiece 4 to be machined is installed in the workpiece installation auxiliary groove, an auxiliary clamping end O-shaped ring 305 for preventing the workpiece 4 to be machined from sliding is arranged at the bottom of the workpiece installation auxiliary groove of the auxiliary clamping head 304, the inner ring of the auxiliary clamping end O-shaped ring 305 is attached to and sleeved on the rear end of the workpiece 4 to be machined, and the outer ring of the auxiliary clamping end O-shaped ring 305 is attached to the inner wall of the workpiece installation auxiliary groove.
The main clamping head 201 and the auxiliary clamping head 304 are clamping heads which can be conveniently assembled and disassembled for replacement, and when different blind hole workpieces are manufactured, only the corresponding main clamping head 201 and auxiliary clamping head 304 are required to be replaced, and the flange-shaped fixed flange end of the main clamping head 201 and the cylindrical fixed end of the auxiliary clamping head 304 are identical, so that the difference is that one end for mounting the blind hole workpieces is formed.
The vertical module driving motor 107 is fixed on the workbench 5 through a vertical module mounting seat 108.
The gas-liquid abrasive particle flow joint 208 is a square joint, and the gas-liquid abrasive particle flow joint 208 is fixed on the slide rail connecting plate 211.
The rotary joint fixing seat 203 comprises a flange type rotary joint fixing base and a flange type rotary joint fixing upper seat, arc-shaped grooves matched with the flange type rotary joint 202 are formed in the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat, the flange type rotary joint 202 is clamped by the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat together, and the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat are fixedly connected through bolts.
The axis of the flange type rotary joint 202 and the axis of the fixed end of the auxiliary clamping head 304 are inclined at an angle of 30-60 degrees with respect to the horizontal plane, and the axis of the flange type rotary joint 202 and the axis of the fixed end of the auxiliary clamping head 304 are perpendicular to the installation inclined plane of the supporting block 301.
The supporting block 301 is a right-angle triangular prism-shaped supporting block 301, two right-angle faces and an installation inclined face are arranged on the supporting block 301, the vertical installation base 303 is fixed on one right-angle face of the supporting block 301, and the auxiliary clamping head 304 is installed on the installation inclined face of the supporting block 301.
The air extracting device is an air extracting pump, and the air compressing device is an air compressor.
A rotary polishing method for polishing blind holes based on a rotary polishing device for polishing blind holes specifically comprises the following steps:
step one: the fixed end of the workpiece 4 to be processed is arranged on the auxiliary clamping head 304 through the auxiliary clamping end O-shaped ring 305;
step two: starting a vertical module driving motor 107, driving a rotary clamping assembly 3 and a rotary clamping assembly 3 for clamping a workpiece 4 to be processed to move downwards by driving a vertical sliding block 106 on a vertical linear module 105 to move downwards in a linear manner, and stopping the vertical module driving motor 107 when the proper height is reached;
step three: starting a horizontal module driving motor 102, driving a runner assembly 2 connected with a horizontal sliding block 103 to move towards a workpiece 4 to be processed by driving the horizontal sliding block 103 on a horizontal linear module 104 to horizontally move, and stopping the horizontal module driving motor 102 after the proper position is reached;
step four: repeating the second step and the third step, gradually approaching the workpiece 4 to be processed and the main clamping head 201 on the horizontal linear module 104 until the processing end of the workpiece 4 to be processed completely stretches into the main clamping head 201, and completely sleeving the processing end of the workpiece 4 to be processed on the main clamping end O-shaped ring 216 in the main clamping head 201, wherein the workpiece 4 to be processed is clamped by the main clamping head 201 and the auxiliary clamping head 304 together at the moment, and the blind hole of the workpiece 4 to be processed is communicated with the flange type rotary joint 202;
step five: opening the abrasive particle flow generating device, the air extracting device and the air compressing device;
step six: the abrasive grain inflow port valve 207 and the air inlet check valve 209 are closed, the air extraction port check valve 205 is opened, and air is extracted by connecting an air extraction device with the air extraction port check valve 205 through an air extraction pipeline, so that the blind hole of the workpiece 4 to be processed and the inside of the flange type rotary joint 202 are in a negative pressure state;
step seven: closing the air suction port check valve 205, keeping the air pressure port check valve 209 closed and opening the abrasive grain inflow port valve 207, so that abrasive grain flow generated in the abrasive grain flow generating device flows through the abrasive grain inflow port valve 207 and the gas-liquid abrasive grain flow joint 208 into the flange type rotary joint 202, and the abrasive grain flow can flow into the blind hole of the workpiece 4 to be processed because the blind hole of the workpiece 4 to be processed and the flange type rotary joint 202 are both in a negative pressure state;
step eight: the abrasive grain inflow port valve 207 is closed, and at this time, the abrasive grain flow in the blind hole of the workpiece 4 to be processed is reversed due to the action of gravity;
step nine: the air suction port check valve 205 is kept closed, the air compression port check valve 209 is opened, compressed air injected by the air compression device passes through the air compression port check valve 209, the suction air T-shaped joint 206 and the air-liquid abrasive particle flow joint 208 to be quickly flushed into the flange type rotary joint 202, and the injected compressed air pushes abrasive particle flow to be quickly flushed into the blind hole of the workpiece 4 to be processed;
step ten: turning on the rotating motor 302, and driving the workpiece 4 to be processed, the main clamping head 201 and the rotating end of the flange type rotating joint 202 to rotate together by the rotating motor 302 through the auxiliary clamping head 304;
step eleven: closing the air pressing port check valve 209, opening the air extraction port check valve 205, and extracting air in the flange type rotary joint 202 by using the air extraction device, so that the abrasive particle flow rapidly flows out of the blind hole under the gravity and the acting force generated by the air extraction device, and the air exchange end of the gas-liquid abrasive particle flow joint 208 is positioned above the abrasive particle inflow port end 214, so that the abrasive particle flow cannot be extracted from the air exchange end of the gas-liquid abrasive particle flow joint 208 when the air extraction device extracts air;
step twelve: the pumping hole one-way valve 205 and the air-pressing hole one-way valve 209 are rapidly opened in turn, namely, the step nine and the step eleven are rapidly repeated, so that the abrasive particle flow is circulated into and out of the blind hole of the workpiece 4 to be processed under the action of periodical pumping air until the blind hole polishing of the workpiece 4 to be processed is completed;
step thirteen: after the machining is finished, the rotating motor 302 is firstly closed, the air inlet check valve 209 and the abrasive grain inflow port valve 207 are opened, the air extraction port check valve 205, the air extraction device, the air compression device and the abrasive grain flow generating device are closed, abrasive grain flows in the blind hole and the flange type rotating joint 202 flow back to the abrasive grain flow generating device through the abrasive grain inflow port valve 207, the air inlet check valve 209 and the air compression device are closed, the horizontal module driving motor 102 and the vertical module driving motor 107 are sequentially started, the runner assembly 2 is separated from the rotating clamping assembly 3, and the workpiece 4 to be machined and the rotating clamping assembly 3 are taken down, so that the whole machining operation is completed.
The above embodiments are only preferred embodiments of the present invention, and are not limiting to the technical solutions of the present invention, and any technical solution that can be implemented on the basis of the above embodiments without inventive effort should be considered as falling within the scope of protection of the patent claims of the present invention.
Claims (7)
1. A rotatory burnishing device for blind hole polishing, its characterized in that: comprises a workbench (5), a movable positioning component (1), a runner component (2) and a rotary clamping component (3);
the movable positioning assembly (1) comprises a horizontal module mounting frame (101), a horizontal linear module (104), a horizontal module driving motor (102), a vertical linear module (105) and a vertical module driving motor (107), wherein the horizontal module mounting frame (101) is fixed on the workbench (5); the horizontal linear module (104) is horizontally fixed on the horizontal module mounting frame (101), the horizontal module driving motor (102) is fixed at one end of the horizontal linear module (104), and a driving shaft of the horizontal module driving motor (102) is connected with the horizontal linear module (104) and drives a horizontal sliding block (103) on the horizontal linear module (104) to do linear motion along the horizontal direction; the vertical module driving motor (107) is vertically fixed on the workbench (5), the vertical linear module (105) is vertically fixed at the upper end of the vertical module driving motor (107), and a driving shaft of the vertical module driving motor (107) is connected with the vertical linear module (105) and drives a vertical sliding block (106) on the vertical linear module (105) to do linear motion along the vertical direction; the runner assembly (2) is arranged on a horizontal sliding block (103) of the horizontal linear module (104), and the rotary clamping assembly (3) is arranged on a vertical sliding block (106) of the vertical linear module (105); the rotary clamping assembly (3) and the runner assembly (2) are arranged on the same side of the horizontal linear module (104);
the rotary clamping assembly (3) comprises a rotary motor (302), a motor mounting seat (307), a bearing (306), a supporting block (301), a secondary clamping head (304) and a vertical mounting seat (303), wherein the vertical mounting seat (303) is fixed on a vertical sliding block (106), the supporting block (301) is fixed on the vertical mounting seat (303), and an inclined downward mounting inclined surface is arranged on the supporting block (301); the installation inclined plane is provided with a circular groove for installing the auxiliary clamping head (304); the supporting block (301) is also provided with a motor mounting groove for mounting the rotating motor (302), the rotating motor (302) is fixed in the motor mounting groove of the supporting block (301) through a motor mounting seat (307), the bottom of the motor mounting groove is provided with a bearing hole communicated with the circular groove, the bearing (306) is embedded in the bearing hole, and an output shaft of the rotating motor (302) penetrates through the bearing (306) to be fixedly connected with the bottom of a secondary clamping head (304) mounted in the circular groove;
the runner assembly (2) comprises a main clamping head (201), a rotating joint fixing seat (203), a runner fixing plate (210), a sliding rail connecting plate (211), an extraction opening one-way valve (205), a gas-liquid abrasive particle flow joint (208), an abrasive particle inflow opening valve (207), an air compressing opening one-way valve (209), a runner joint (204), a flange type rotating joint (202) and a main clamping end O-shaped ring (216), wherein the sliding rail connecting plate (211) is vertically arranged on a horizontal sliding block (103) of the horizontal linear module (104), the runner fixing plate (210) is fixedly arranged on the sliding rail connecting plate (211), the rotating joint fixing seat (203) is fixedly arranged on the runner fixing plate (210), the flange type rotating joint (202) is arranged on the rotating joint fixing seat (203), and the axial lead of the flange type rotating joint (202) is parallel to the axial lead of an output shaft of the rotating motor (302) when the flange type rotating joint (202) is arranged; one end of the flange type rotary joint (202) close to the rotary clamping assembly (3) is a rotary end of the flange type rotary joint (202), a flange is arranged on the rotary end of the flange type rotary joint (202), a main clamping head (201) is arranged on the flange of the rotary end of the flange type rotary joint (202), two ends of a workpiece (4) to be processed are respectively clamped through the main clamping head (201) and an auxiliary clamping head (304), and a blind hole of the workpiece (4) to be processed is positioned at one end of the main clamping head (201); the other end of the flange type rotary joint (202) is a fixed end of the flange type rotary joint (202), the flange type rotary joint (202) is connected with a gas-liquid abrasive particle flow joint (208) through a runner joint (204), the gas-liquid abrasive particle flow joint (208) is provided with three inlets and outlets which are an abrasive particle inflow end (214), an abrasive particle outflow end (215) and a ventilation end respectively, the abrasive particle inflow end (214), the abrasive particle outflow end (215) and the ventilation end are mutually communicated, the abrasive particle outflow end (215) of the gas-liquid abrasive particle flow joint (208) is connected with the runner joint (204), the abrasive particle inflow end (214) of the gas-liquid abrasive particle flow joint (208) is connected with an external abrasive particle flow generating device through an abrasive particle inflow valve (207) and an abrasive particle flow pipeline, and the ventilation end of the gas-liquid abrasive particle flow joint (208) is connected with the pumping T-shaped joint (206); the suction gas T-shaped connector (206) is provided with a suction opening (213), a gas compressing opening (212) and a gas exchanging opening, the suction opening (213), the gas compressing opening (212) and the gas exchanging opening are communicated with each other, the gas exchanging opening of the suction gas T-shaped connector (206) is connected with the gas exchanging end of the gas-liquid abrasive particle flow connector (208), the suction opening (213) of the suction gas T-shaped connector (206) is connected with an external gas extracting device through a suction opening one-way valve (205) and a suction pipeline, and the gas compressing opening (212) of the suction gas T-shaped connector (206) is connected with the external gas compressing device through a gas compressing opening one-way valve (209) and a gas compressing pipeline; the ventilation end of the gas-liquid abrasive particle flow joint (208) is positioned above the abrasive particle inflow end (214);
the main clamping head (201) comprises a flange-shaped fixed flange end and a main mounting end used for fixing a workpiece (4) to be machined, the fixed flange end of the main clamping head (201) is fixedly connected with a flange plate of the rotating end of the flange-type rotary joint (202) through bolts, a workpiece mounting main groove matched with the machining end of the workpiece (4) to be machined is formed in the main mounting end of the main clamping head (201), the machining end of the workpiece (4) to be machined is mounted in the main workpiece mounting main groove, a main clamping end O-shaped ring (216) used for preventing the machining end of the workpiece (4) to be machined from sliding is arranged in the main workpiece mounting main groove, an inner ring of the main clamping end O-shaped ring (216) is attached to and sleeved on the machining end of the workpiece (4) to be machined, and an outer ring of the main clamping end O-shaped ring (216) is attached to the inner wall of the main workpiece mounting groove; the auxiliary clamping head (304) comprises a cylindrical fixed end and an auxiliary mounting end for fixing a workpiece (4) to be machined, the fixed end of the auxiliary clamping head (304) is fixedly arranged on an output shaft of the rotating motor, a workpiece mounting auxiliary groove matched with the rear end of the workpiece (4) to be machined is formed in the auxiliary mounting end of the auxiliary clamping head (304), the rear end of the workpiece (4) to be machined is mounted in the workpiece mounting auxiliary groove, an auxiliary clamping end O-shaped ring (305) for preventing the workpiece (4) to be machined from sliding is arranged at the bottom of the workpiece mounting auxiliary groove of the auxiliary clamping head (304), the inner ring of the auxiliary clamping end O-shaped ring (305) is attached to the rear end of the workpiece (4) to be machined, and the outer ring of the auxiliary clamping end O-shaped ring (305) is attached to the inner wall of the workpiece mounting auxiliary groove;
the supporting block (301) is a right-angle triangular prism-shaped supporting block (301), two right-angle faces and an installation inclined face are arranged on the supporting block (301), the vertical installation base (303) is fixed on one right-angle face of the supporting block (301), and the auxiliary clamping head (304) is installed on the installation inclined face of the supporting block (301).
2. A rotary polishing apparatus for blind hole polishing as recited in claim 1, wherein: the vertical module driving motor (107) is fixed on the workbench (5) through a vertical module mounting seat (108).
3. A rotary polishing apparatus for blind hole polishing as recited in claim 1, wherein: the gas-liquid abrasive particle flow connector (208) is a square connector, and the gas-liquid abrasive particle flow connector (208) is fixed on the sliding rail connecting plate (211).
4. A rotary polishing apparatus for blind hole polishing as recited in claim 1, wherein: the rotary joint fixing seat (203) comprises a flange type rotary joint fixing base and a flange type rotary joint fixing upper seat, arc grooves matched with the flange type rotary joint (202) are formed in the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat, the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat clamp the flange type rotary joint (202) together, and the flange type rotary joint fixing base and the flange type rotary joint fixing upper seat are fixedly connected through bolts.
5. A rotary polishing apparatus for blind hole polishing as recited in claim 1, wherein: the axial lead of the flange type rotary joint (202) and the axial lead of the fixed end of the auxiliary clamping head (304) are inclined at an angle of 30-60 degrees with the horizontal plane, and the axial lead of the flange type rotary joint (202) and the axial lead of the fixed end of the auxiliary clamping head (304) are perpendicular to the installation inclined plane of the supporting block (301).
6. A rotary polishing apparatus for blind hole polishing as recited in claim 1, wherein: the air extracting device is an air extracting pump, and the air compressing device is an air compressor.
7. A spin polishing method for blind hole polishing, employing a spin polishing apparatus for blind hole polishing as claimed in claim 1, characterized in that: the method specifically comprises the following steps:
step one: the fixed end of a workpiece (4) to be processed is arranged on a secondary clamping head (304) through a secondary clamping end O-shaped ring (305);
step two: starting a vertical module driving motor (107), driving a rotary clamping assembly (3) and a rotary clamping assembly (3) for clamping a workpiece (4) to be processed to move downwards by driving a vertical sliding block (106) on a vertical linear module (105) to move downwards in a linear manner, and stopping the vertical module driving motor (107) when the height reaches a proper level;
step three: starting a horizontal module driving motor (102), driving a runner assembly (2) connected with a horizontal sliding block (103) to move towards a workpiece (4) to be processed by driving the horizontal sliding block (103) on a horizontal linear module (104) to horizontally move, and stopping the horizontal module driving motor (102) after the horizontal linear module reaches a proper position;
step four: repeating the second step and the third step, so that the workpiece (4) to be machined and the main clamping head (201) on the horizontal linear module (104) are gradually close to each other until the machining end of the workpiece (4) to be machined completely stretches into the main clamping head (201), and the main clamping end O-shaped ring (216) in the main clamping head (201) completely sleeves the machining end of the workpiece (4) to be machined, and at the moment, the workpiece (4) to be machined is clamped by the main clamping head (201) and the auxiliary clamping head (304) together, and a blind hole of the workpiece (4) to be machined is communicated with the flange-type rotary joint (202);
step five: opening the abrasive particle flow generating device, the air extracting device and the air compressing device;
step six: the abrasive grain inflow port valve (207) and the air inlet check valve (209) are closed, the air extraction port check valve (205) is opened, and the air extraction device is connected through the air extraction pipeline by utilizing the air extraction port check valve (205) to carry out air extraction, so that the blind hole of the workpiece (4) to be processed and the inside of the flange type rotary joint (202) are in a negative pressure state;
step seven: closing the air suction port one-way valve (205), keeping the air pressure port one-way valve (209) closed and opening the abrasive particle inflow port valve (207), so that abrasive particle flow generated in the abrasive particle flow generating device flows through the abrasive particle inflow port valve (207) and the gas-liquid abrasive particle flow joint (208) to enter the flange type rotary joint (202), and the abrasive particle flow flows into the blind hole of the workpiece (4) to be processed because the blind hole of the workpiece (4) to be processed and the flange type rotary joint (202) are both in a negative pressure state;
step eight: closing the abrasive grain inflow port valve (207), wherein abrasive grain flow in the blind hole of the workpiece (4) to be processed flows backwards under the action of gravity;
step nine: the air pumping port check valve (205) is kept closed, the air pressing port check valve (209) is opened, compressed air injected by the air pressing device is quickly flushed into the flange type rotary joint (202) through the air pressing port check valve (209), the suction air T-shaped joint (206) and the air-liquid abrasive particle flow joint (208), and the injected compressed air pushes abrasive particle flow to be quickly flushed into a blind hole of a workpiece (4) to be processed;
step ten: opening a rotating motor (302), wherein the rotating motor (302) drives the workpiece (4) to be processed, the main clamping head (201) and the rotating end of the flange type rotating joint (202) to rotate together through a secondary clamping head (304);
step eleven: closing a pressure air port one-way valve (209), opening an extraction opening one-way valve (205), extracting air in the flange type rotary joint (202) by using an extraction device, enabling abrasive particle flow to rapidly flow out of the blind hole under the action force generated by gravity and the extraction device, and preventing the abrasive particle flow from being extracted from the air exchange end of the gas-liquid abrasive particle flow joint (208) when the extraction device extracts air because the air exchange end of the gas-liquid abrasive particle flow joint (208) is positioned above the abrasive particle inflow port (214);
step twelve: opening the air suction port one-way valve (205) and the air compression port one-way valve (209) in turn rapidly, namely rapidly repeating the step nine and the step eleven, so that abrasive particle flows circularly enter and exit the blind hole of the workpiece (4) to be processed under the action of periodical air suction and compression until the blind hole of the workpiece (4) to be processed is polished;
step thirteen: after the machining is finished, firstly, the rotating motor (302) is closed, then the air compressing opening one-way valve (209) and the abrasive particle inflow opening valve (207) are opened, the air extracting opening one-way valve (205), the air extracting device, the air compressing device and the abrasive particle flow generating device are closed, abrasive particle flows in the blind hole and the flange type rotating joint (202) flow back to the abrasive particle flow generating device through the abrasive particle inflow opening valve (207), then the air compressing opening one-way valve (209) and the air compressing device are closed, the horizontal module driving motor (102) and the vertical module driving motor (107) are sequentially started, the runner assembly (2) is separated from the rotating clamping assembly (3), and the workpiece (4) to be machined is taken down from the rotating clamping assembly (3), so that the whole machining operation is completed.
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