CN111230653A - Novel wheeled gasbag polishing device - Google Patents
Novel wheeled gasbag polishing device Download PDFInfo
- Publication number
- CN111230653A CN111230653A CN202010079036.9A CN202010079036A CN111230653A CN 111230653 A CN111230653 A CN 111230653A CN 202010079036 A CN202010079036 A CN 202010079036A CN 111230653 A CN111230653 A CN 111230653A
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- Prior art keywords
- air
- air bag
- polishing
- handle part
- polishing device
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Classifications
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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
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
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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
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
- B24B13/012—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools conformable in shape to the optical surface, e.g. by fluid pressure acting on an elastic membrane
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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
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
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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
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a novel wheel type air bag polishing device which comprises a handle part, wherein an annular groove is formed in an outer revolution surface of the lower part of the handle part, an air chamber is arranged in the lower part of the handle part, a radial air inlet through hole is formed in the side wall of the air chamber, a sleeve which rotates relative to the handle part is sleeved on the lower part of the handle part, an air hole communicated with the air chamber is formed in the side wall of the sleeve, and an air bag polishing wheel component is connected to the lower; the air bag polishing wheel component comprises a metal hollow rod, a metal rotary wheel shaft, an air bag and a polishing pad, the vent hole is connected to the air pump, and after the air pump is started, air sequentially passes through the annular groove, the radial air inlet through hole, the air chamber, the metal hollow rod, the radial air outlet through hole and the metal rotary wheel shaft from the vent hole to the air bag. In the machining process, the machining equipment provides rotary motion and deterministic track motion for the air bag polishing device, the external air pump provides stable air pressure for the interior of the air bag polishing wheel component, and the polishing pad of the air bag polishing wheel component is in flexible contact with the surface of a workpiece to be machined, so that material removal is realized.
Description
Technical Field
The invention relates to a free-form surface grinding and polishing device in the field of mechanical manufacturing, in particular to an air bag polishing device suitable for machining a deep cavity profiled surface.
Background
In recent years, with the development and progress of science and technology, optical elements have been widely used in aerospace, large-scale laser systems and microelectronic systems due to their excellent characteristics such as high transparency, optical uniformity and stable chemical properties. However, with the continuous progress of recent optical and optoelectronic technologies, higher requirements are put on the precision and structure of optical elements, and the development requirements of optical engineering and photonic technologies are difficult to meet by common optical elements. The special-shaped optical element, as a class of novel optical elements, is different from a common optical element due to a special structure, and is widely applied to optical products and communication products by virtue of the unique structural advantages of the special-shaped optical element, so that the special-shaped optical element becomes an indispensable part in aerospace, navigation guidance, laser weapons and military defense. Due to the increasing demand for special-shaped precise optical elements, higher requirements are put forward on the processing method, the processing precision and the processing efficiency of the special-shaped precise optical elements in the processing process. The deep cavity special-shaped optical element is used as one of special-shaped optical elements, and has strict requirements on the shape and the structure in the precision machining process, and the machining precision of the deep cavity special-shaped surface is also strictly controlled, so that the precision and the reliability of the deep cavity special-shaped optical element are ensured. Therefore, how to realize the precision machining of the deep cavity special-shaped optical element with high quality, high precision and high efficiency becomes a problem to be solved in the field of optical machining and manufacturing.
For deep cavity profiled optical elements, the usual machining methods are ultrasonic vibration polishing and abrasive flow polishing. The working principle of ultrasonic polishing is that the tool head is applied with up-and-down reciprocating high-frequency ultrasonic vibration of tens of thousands of hertz on the basis of common rotary grinding, in the process of processing a cavity structure, polishing solution containing abrasive particles is added between the tool head and the cavity wall, and along with the vibration of the tool head, the abrasive particles in the polishing solution collide and rub with the surface of the cavity, so that the surface material is removed. Although ultrasonic polishing has high processing efficiency and good processing precision, the processing precision and the processing efficiency gradually decrease due to inevitable abrasion of the polishing tool head and decrease of fit with the cavity. The abrasive flow polishing is realized by extruding viscoelastic polishing liquid containing fine abrasive particles through a cavity under the action of pressure. However, the flow rate of the viscoelastic polishing solution is reduced, so that the polishing efficiency is affected, and the surfaces of the inner cavities polished by the abrasive flow generate mutually parallel long strips, which is not ideal for reducing the surface roughness. The existing precision grinding and polishing methods such as small grinding head polishing, magnetorheological polishing, jet polishing, airbag polishing and the like have the advantages of controllable polishing area, stable removal effect, high removal rate, high processing precision and the like, but are generally limited to be applied to processing of outer surfaces of plane, aspheric optical elements and the like. Due to the structural particularity of the deep-cavity profiled optical element, the grinding and polishing methods are difficult to grind and polish.
Disclosure of Invention
Aiming at the problems of difficult processing, low processing precision and low efficiency of the inner part of the cavity of the deep-cavity special-shaped optical element in the prior art, the invention provides a novel wheel type air bag polishing device based on the traditional air bag polishing technology, and the novel wheel type air bag polishing device can be applied to the rapid grinding and polishing processing of the deep-cavity special-shaped surface of the deep-cavity special-shaped optical element.
In order to solve the technical problem, the novel wheel type air bag polishing device comprises a handle part, wherein an annular groove is formed in an outer revolution surface of the lower part of the handle part, an air chamber is arranged inside the lower part of the handle part, a plurality of radial air inlet through holes which are uniformly distributed in the circumferential direction and are communicated with the annular groove are formed in the side wall of the air chamber, a sleeve which rotates relative to the handle part is sleeved on the lower part of the handle part, air holes communicated with the air chamber are formed in the side wall of the sleeve, and an air bag polishing wheel component is connected to the lower end of the handle part; the air bag polishing wheel component comprises a metal hollow rod, a metal rotating wheel shaft, an air bag and a polishing pad, one end of the metal hollow rod is connected with the bottom end of the handle part, a plurality of radial air outlet through holes are formed in the other end of the metal hollow rod, the metal rotating wheel shaft is connected to the other end of the metal hollow rod, the air bag is wrapped on the metal rotating wheel shaft, and the polishing pad is adhered to the outer surface of the air bag; the air vent is connected to the air pump, and after the air pump is started, air passes through the annular groove, the radial air inlet through hole, the air chamber, the metal hollow rod, the radial air outlet through hole and the metal rotary wheel shaft from the air vent to the air bag in sequence.
Further, the novel wheel type air bag polishing device provided by the invention is characterized in that the number of the radial air inlet through holes and the number of the radial air outlet through holes are 4. The radial air inlet through holes are rectangular holes, and the radial air outlet through holes are round holes.
An upper rolling bearing and a lower rolling bearing are arranged between the upper end of the sleeve and an outer revolution surface of the lower portion arranged between the handle portions, so that the sleeve is kept static when the handle portions rotate.
An upper sealing ring is arranged between the sleeve and the handle part, a locking ring is arranged at the bottom of the sleeve, and a lower sealing ring is arranged between the sleeve and the locking ring.
The metal hollow rod and the metal rotating wheel shaft are detachably connected or non-detachably connected.
The metal hollow rod and the handle part can be in standard connection such as threaded connection, ER joint connection, BT joint connection and the like.
The air bag is formed by sealing and bonding an elastic rubber layer and a metal rotating wheel shaft.
The polishing pad is a grinding or polishing pad such as a non-woven fabric pad, a foamed polyurethane pad, a damping fabric pad, a consolidation abrasive pad and the like.
Compared with the prior art, the invention has the beneficial effects that:
(1) the wheel type air bag polishing device can realize the flexible contact of the polishing pad and the surface of the inner cavity by adjusting the internal air pressure, thereby ensuring certain processing precision.
(2) The tail end (the upper end of the handle part) of the wheeled air bag polishing device is a stainless steel substrate which is designed into a standard tool handle joint or other joints, so that the device can be clamped with a numerical control machine tool or an industrial robot, and high-speed rotary motion and deterministic track motion of the device are realized.
(3) The air bag polishing wheel component of the wheel type air bag polishing device can be replaced by an air bag polishing wheel component with a corresponding size according to the length change and the diameter change of a deep-cavity special-shaped workpiece;
(4) the invention is suitable for grinding and polishing planes, aspheric surfaces, free-form surfaces and the like, and is particularly suitable for processing deep cavity profiled surfaces.
(5) The wheel type air bag polishing device is suitable for polishing and processing various metals, non-metallic materials, composite materials and the like with deep cavity special-shaped structures.
Drawings
FIG. 1 is a front view of a wheeled bladder polishing device of the present invention;
fig. 2 is a sectional view of the wheel type bladder polishing apparatus shown in fig. 1.
In the figure:
1-handle part 11-air chamber 12-annular groove 13-radial air inlet through hole
14-connecting hole 2-upper sealing ring 3-vent hole 4-sleeve
5-lower seal ring 6-locking ring 7-airbag polishing wheel component 71-metal hollow rod
72-Metal rotating wheel shaft 73-polishing pad 74-elastic rubber layer 75-radial vent hole
8-deep cavity special-shaped workpiece 9-upper rolling bearing 10-lower rolling bearing
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
As shown in fig. 1 and 2, the novel wheel type air bag polishing device provided by the invention comprises a handle part 1, wherein an annular groove 12 is formed in an outer revolution surface of the lower part of the handle part 1, an air chamber 11 is formed in the lower part of the handle part 1, a plurality of radial air inlet through holes 13 which are uniformly distributed in the circumferential direction and are communicated with the annular groove 12 are formed in the side wall of the air chamber 11, the number of the radial air inlet through holes 13 is 4, and the radial air inlet through holes 13 are rectangular holes. A sleeve 4 which rotates relative to the handle 1 is sleeved on the lower part of the handle 1, and an upper rolling bearing 9 and a lower rolling bearing 10 are arranged between the upper end of the sleeve 4 and the outer revolution surface of the lower part arranged between the handle 1 and the upper end of the sleeve 4; an upper sealing ring 2 is arranged between the sleeve 4 and the handle part 1, a locking ring 6 is arranged at the bottom of the sleeve 4, and a lower sealing ring 5 is arranged between the sleeve 4 and the locking ring 6. The side wall of the sleeve 4 is provided with a vent hole 3 communicated with the air chamber 11, and the lower end of the handle part 1 is connected with an air bag polishing wheel component 7; the gasbag aureola part 7 includes pole 71, the rotatory shaft 72 of metal, gasbag 74 and polishing pad 73 in the metal, the one end of pole 71 in the metal with the bottom threaded connection of stalk portion 1, the other end of pole 71 in the metal is equipped with a plurality of radial air outlet hole 75, the number of radial air outlet hole 75 is 4, radial air outlet hole 75 is the round hole. The metal rotating wheel shaft 72 is connected to the other end of the metal hollow rod 71, and the metal hollow rod 71 and the metal rotating wheel shaft 72 are detachably connected or non-detachably connected. The air bag 74 is wrapped on the metal rotating wheel shaft 72, the air bag 74 is formed by sealing and bonding an elastic rubber layer and the metal rotating wheel shaft 72, and the polishing pad 73 is adhered to the outer surface of the elastic rubber layer.
In the processing process, a mobile platform of processing equipment provides rotary motion and deterministic track motion for the air bag polishing device; an external air pump provides stable air pressure for the interior of the air bag polishing wheel component through the vent hole; the polishing pad of the air bag polishing wheel component is in flexible contact with the surface of the workpiece to be processed, so that material removal is realized.
In the invention, the handle part 1 is a stainless steel substrate, the upper part of the stainless steel substrate can be a BT shank joint or other joints, and is conveniently clamped by a numerical control machine tool or an industrial robot, and when the air bag polishing device is used for grinding and processing the inner cavity of the deep cavity special-shaped workpiece 8, the air bag of the air bag polishing wheel component is provided with high-speed rotary motion and is tightly attached to the deep cavity special-shaped surface to do deterministic track motion, so that the deterministic grinding and polishing processing of the inner surface and the outer surface of the deep cavity special-shaped workpiece are realized.
In the invention, the sleeve 4 is connected with the lower part of the handle part 1 through the upper and lower rolling bearings 9 and 10, so that the sleeve 4 is kept static under the high-speed rotation of the handle part 1, and the winding of an air pipe is avoided. The side wall of the sleeve 4 is provided with a vent hole 3, the vent hole 3 arranged on the side wall of the sleeve 4 is connected with an external air pump, and compressed air is transported in an air chamber 11 inside the polishing device. The middle part of the handle part 1 is provided with an annular groove 12, the annular groove 12 is provided with four rectangular radial air inlet through holes 13 of an image air chamber 11, the air chamber 11 is formed between the sleeve 4 and the outer revolution surface at the lower end of the handle part 1 through the structures of the annular groove 12, the radial air outlet through holes 13 and the like, the air chamber 11 is provided with four circular radial air outlet through holes 75 inside the air bag polishing wheel part 7, and the air chamber 11 is communicated with the air bag 74 of the air bag polishing wheel part 7 through the structures of a metal hollow rod 71 and the radial air outlet through holes 75. When the polishing machine is used, the vent holes 3 are connected to an external air pump, after the air pump is started, air sequentially passes through the vent holes 3, the annular groove 12, the radial air inlet through hole 13, the air chamber 11, the metal hollow rod 71, the radial air outlet through hole 75 and the metal rotating wheel shaft 72 to the air bag 74, so that compressed air with certain external pressure is conveyed to the interior of the air bag 74, and under the action of the compressed air, the polishing pad 73 of the air bag polishing wheel component 7 is in flexible contact with the special-shaped surface of the deep-cavity special-shaped workpiece 8, so that the special-shaped surface of the deep-cavity special-shaped workpiece is. The pressure output of the external air pump is adjusted to control the contact area (contact area) of the air bag 74 and the special-shaped surface of the deep-cavity special-shaped workpiece 8, so that certain processing precision is ensured.
In the present invention, the upper end of the air bag polishing wheel component 7 is provided with a metal hollow rod 71 with a certain length, and the metal hollow rod 71 is connected with the air chamber 11 in a sealing manner through a screw thread. The metal hollow rod 71 is provided with a number of radial air outlet holes for transporting compressed air to the interior of the air bag 74. The contact area between the air bag polishing wheel and the inner and outer surfaces of the deep-cavity special-shaped workpiece is adjusted in real time by adjusting the output air pressure value of the external air pump in real time.
In the present invention, the air cell 74 is formed by hermetically bonding an elastic rubber layer and the metal rotary wheel 72, and the polishing pad 73 is bonded to the outside of the elastic rubber layer, and may be any one of a non-woven fabric pad, a foamed polyurethane pad, a damping fabric pad and a fixed abrasive pad. When the airbag polishing device provided by the invention is used for grinding and processing the deep cavity special-shaped surface, grinding fluid or polishing fluid is injected into the contact area between the airbag 74 and the inner and outer surfaces of the deep cavity special-shaped workpiece, and during the actual grinding and polishing process, the specific material of the polishing pad 73 bonded on the outer part of the corresponding airbag polishing wheel component 7 and the grinding fluid or polishing fluid with different particle sizes can be replaced according to different processing precision requirements. The air bag polishing wheel component 7 with corresponding size can be replaced according to the requirements of the diameter and the length of different deep cavity special-shaped workpieces 8, and comprises the length of a metal hollow rod 71, the diameter of a metal rotating wheel shaft 72 and the like.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (10)
1. A novel wheel type air bag polishing device comprises a handle part (1), and is characterized in that an annular groove (12) is formed in an outer revolution surface of the lower part of the handle part (1), an air chamber (11) is arranged in the lower part of the handle part (1), a plurality of radial air inlet through holes (13) which are uniformly distributed in the circumferential direction and are communicated with the annular groove (12) are formed in the side wall of the air chamber (11), a sleeve (4) which rotates relative to the handle part (1) is sleeved on the lower part of the handle part (1), air holes (3) communicated with the air chamber (11) are formed in the side wall of the sleeve (4), and an air bag polishing wheel component (7) is connected to the lower end of the handle part (1); the air bag polishing wheel component (7) comprises a metal hollow rod (71), a metal rotating wheel shaft (72), an air bag (74) and a polishing pad (73), one end of the metal hollow rod (71) is connected with the bottom end of the handle part (1), the other end of the metal hollow rod (71) is provided with a plurality of radial air outlet through holes (75), the metal rotating wheel shaft (72) is connected with the other end of the metal hollow rod (71), the air bag (74) wraps the metal rotating wheel shaft (72), and the polishing pad (73) is adhered to the outer surface of the air bag (74); the air vent (3) is connected to an air pump, and after the air pump is started, air passes through the annular groove (12), the radial air inlet through hole (13), the air chamber (11), the metal hollow rod (71), the radial air outlet through hole (75), the metal rotating wheel shaft (72) and the air bag (74) from the air vent (3) in sequence.
2. The novel wheel type air bag polishing device according to claim 1, characterized in that the number of the radial air inlet through holes (13) and the number of the radial air outlet through holes (75) are 4.
3. A novel wheel type air bag polishing device according to claim 1, characterized in that the radial air inlet through hole (13) is a rectangular hole, and the radial air outlet through hole (75) is a circular hole.
4. A novel wheel-type airbag polishing device according to claim 1, characterized in that an upper rolling bearing (9) and a lower rolling bearing (10) are arranged between the upper end of the sleeve (4) and the outer surface of revolution of the lower part of the handle (1) to ensure that the sleeve (4) remains stationary when the handle (1) rotates.
5. A novel wheel type air bag polishing device according to claim 1, characterized in that an upper sealing ring (2) is arranged between the sleeve (4) and the handle part (1), a locking ring (6) is arranged at the bottom of the sleeve (4), and a lower sealing ring (5) is arranged between the sleeve (4) and the locking ring (6).
6. The novel wheeled bladder polishing device according to claim 1, wherein the connection between the metal hollow stem (74) and the handle (1) is one of a threaded connection, an ER-joint connection and a BT-joint connection.
7. The novel wheeled airbag polishing device according to claim 1, characterized in that the metal hollow rod (71) is detachably connected with the metal rotary axle (72).
8. A novel wheeled airbag polishing device according to claim 1, characterized in that the metal hollow rod (71) is non-detachably connected with the metal rotary axle (72).
9. A novel wheeled bladder polishing device according to claim 1, wherein said bladder (74) is constructed of a resilient rubber layer sealingly bonded to a metal rotating hub (72).
10. A novel wheeled bladder polishing device according to claim 1, wherein said polishing pad (73) is any one of a non-woven cloth pad, a foamed polyurethane pad, a damping cloth pad and a fixed abrasive pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079036.9A CN111230653A (en) | 2020-02-03 | 2020-02-03 | Novel wheeled gasbag polishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079036.9A CN111230653A (en) | 2020-02-03 | 2020-02-03 | Novel wheeled gasbag polishing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111230653A true CN111230653A (en) | 2020-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010079036.9A Pending CN111230653A (en) | 2020-02-03 | 2020-02-03 | Novel wheeled gasbag polishing device |
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| CN (1) | CN111230653A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872790A (en) * | 2020-07-07 | 2020-11-03 | 霍祥宇 | Overheat protection device is prevented in optical lens location processing |
| CN112775726A (en) * | 2021-01-25 | 2021-05-11 | 党晓宏 | High-finish grinding method based on pneumatic grinding machine |
| CN112809471A (en) * | 2021-01-25 | 2021-05-18 | 党晓宏 | Grinding method for straight inner hole with high finish degree |
| CN112873006A (en) * | 2021-01-25 | 2021-06-01 | 潘长挺 | Bidirectional synchronous inner hole grinding machine |
| CN112917250A (en) * | 2021-01-25 | 2021-06-08 | 潘长挺 | Grinding method for machining arc-shaped inner hole of workpiece |
| CN112917377A (en) * | 2021-01-25 | 2021-06-08 | 党晓宏 | Pneumatic type part inner hole high-finish grinding machine |
| CN112917376A (en) * | 2021-01-25 | 2021-06-08 | 党晓宏 | Straight hole high finish grinds machine |
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| CN109676507A (en) * | 2019-01-23 | 2019-04-26 | 厦门大学 | A kind of high speed air-floating main shaft air bag polishing device |
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| JPS60259379A (en) * | 1984-06-01 | 1985-12-21 | Osaka Kiko Co Ltd | Grinding apparatus |
| DE3910581C2 (en) * | 1989-04-01 | 1991-02-14 | Messer Griesheim Gmbh, 6000 Frankfurt, De | |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872790A (en) * | 2020-07-07 | 2020-11-03 | 霍祥宇 | Overheat protection device is prevented in optical lens location processing |
| CN112775726A (en) * | 2021-01-25 | 2021-05-11 | 党晓宏 | High-finish grinding method based on pneumatic grinding machine |
| CN112809471A (en) * | 2021-01-25 | 2021-05-18 | 党晓宏 | Grinding method for straight inner hole with high finish degree |
| CN112873006A (en) * | 2021-01-25 | 2021-06-01 | 潘长挺 | Bidirectional synchronous inner hole grinding machine |
| CN112917250A (en) * | 2021-01-25 | 2021-06-08 | 潘长挺 | Grinding method for machining arc-shaped inner hole of workpiece |
| CN112917377A (en) * | 2021-01-25 | 2021-06-08 | 党晓宏 | Pneumatic type part inner hole high-finish grinding machine |
| CN112917376A (en) * | 2021-01-25 | 2021-06-08 | 党晓宏 | Straight hole high finish grinds machine |
| CN112917376B (en) * | 2021-01-25 | 2022-09-02 | 青岛毅峰盛机械设备有限公司 | Straight hole high finish grinds machine |
| CN112917377B (en) * | 2021-01-25 | 2022-09-27 | 西安宏盛达精密机械制造有限公司 | Pneumatic type part inner hole high-finish grinding machine |
| CN112775726B (en) * | 2021-01-25 | 2022-12-06 | 东莞市元锦成精密科技有限公司 | High-finish grinding method based on pneumatic grinding machine |
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