EP1350600B1 - Apparatus and procedure for surface finishing of pipes by means of lamellar wheels - Google Patents
Apparatus and procedure for surface finishing of pipes by means of lamellar wheels Download PDFInfo
- Publication number
- EP1350600B1 EP1350600B1 EP03004196A EP03004196A EP1350600B1 EP 1350600 B1 EP1350600 B1 EP 1350600B1 EP 03004196 A EP03004196 A EP 03004196A EP 03004196 A EP03004196 A EP 03004196A EP 1350600 B1 EP1350600 B1 EP 1350600B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- pipe
- brush
- finishing
- holding means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
- B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
-
- 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
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
- B24B27/04—Grinding machines or devices in which the grinding tool is supported on a swinging arm
-
- 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
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
- B24B29/06—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction
- B24B29/08—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction the cross-section being circular, e.g. tubes, wires, needles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/38—Single-purpose machines or devices for externally grinding travelling elongated stock, e.g. wire
Definitions
- the present invention refers to the field of surface finishing of pipes.
- US-A-5 371 972 discloses an apparatus for surface finishing of a pipe comprising means rotatably supporting the pipe, means to make the pipe rotate around its own axis, means to feed the pipe in the direction defined by its own axis, a brush element and means for positioning and for driving in rotation said brush element.
- a brushing treatment on the outside surface of pipes by means of rotating brushes is known, in lines for the production of pipes starting from sheet metal, using a brush-holding head that turns around the pipe.
- the pipe advances without rotating.
- the finishing obtained is not precise and therefore the procedure cannot be used when a precision finishing is required.
- a further drawback is the need to lubricate the pipe with plenty of water in the area of friction thereof with the belt, and the use of water or other liquid for lubrication and cooling leads to the production of sludge, which is difficult and laborious to dispose of. Furthermore, water is a cause of deterioration of the fixed or moving mechanical parts and the sludge produced must be manually removed from the line by the operators, with a resulting waste of time.
- the procedure comprises the stages of operating on a pipe advancing along its own axis and rotating with a plurality of lamellar wheels or brushes placed alongside the pipe and rotating around an axis which is generally parallel to the axis of the pipe.
- the apparatus comprises a bed of idle rollers supporting the pipe, a brush-holding sleeve mounted on a support adjustable in position with respect to the pipe bed, means for causing the pipe to advance and to rotate and means to determine the position of the brush-holding sleeve.
- an apparatus for surface finishing of pipes is generally designated 10 and comprises, on a bed 12, a pipe supporting and feeding bed, designated 14, and a finishing unit, hereunder also called a grinding unit, designated 16.
- T The pipe under production will hereunder be denoted generically by T; in Figure 1 a maximum diameter pipe T1 and a minimum diameter pipe T2, such as can be finished with the apparatus of the invention, have been drawn.
- the pipe supporting and feeding bed 14 comprises a plurality of roller assemblies 18, each comprising one or more rollers or wheels 20 idle around generally horizontal axes a 20.
- the roller assemblies are generally disposed on two rows, offset or in a quincunx, that is to say one on one side and the next, shifted longitudinally by a distance, on the other side of a runway for the pipe, which they define.
- Each roller assembly 18 comprises a fixed frame 20 fixed to the bed and a moveable frame 24 thereon, rocking around a horizontal axis a 24 under the control of a cylinder-piston 25.
- the rocking controlled by the cylinder-piston assemblies 25 disposes the frames 24 in a more or less upwardly widened position and, consequently, sets the rollers in a position more or less close to each other to adapt them to pipes to be treated of different diameters.
- an adjustable frame 26 bearing the roller, which can be rotated, by not illustrated means, around the respective vertical axis a 26 to dispose the respective roller at the desired angle with respect to the axis of the pipe.
- a brush-holding shaft or sleeve 30 of the grinding unit 16 ( Figures 3, 5) is supported.
- the brush-holding sleeve has a horizontal axis a 30 parallel to the axis a T of the pipe and is rotatably supported, through two end universal joints 33 and 33', on the side arms 34 and 34' of a rocking arm structure 35 of the unit 16.
- the arms 34, 34' are each mounted on a support 36, respectively 36', fixed to the bed, by means of a pivot part 37 ( Figure 6) which defines a horizontal rocking axis a 16 for the unit 16.
- the arm 34 of the structure carries a motor 40 for rotation of the brushes, visible in Figures 2 and 7.
- the motor 40 has a drive shaft 41 which bears a drive pulley 42.
- a belt 43 transmits the motion to a driven pulley 44 integral with the pivot of a universal joint 33, of the end universal joints of the brush-holding shaft.
- the unit 16 rocks therefore around the axis a 16 defined by the pivots 37.
- an element of a cylinder-piston assembly 48 acts on the part of the structure 34 opposite the brush-holding shaft.
- a linear transducer 50 of the optical or incremental type, per se known, is also mounted between the bed and the same part of the brush-holding structure to allow adjustment of the position of the brushes with respect to the pipe in view of the diameter of the pipe and of the wear of the brushes.
- the brushes used are preferably lamellar rotating brushes ("wheels"), available on the market and denoted by S in the figures.
- Said lamellar wheels comprise a body, generally of plastic material, and radial foils extending from the body, generally consisting of cotton or polyester cloths, or of wheels of different materials that have abrasive incorporated, with or without abrasive powders applied.
- Lamellar wheels preferably from 10 to 500 mm in diameter and lengths from 100 to 1000 mm can be used. The wheels are locked in a pack on the sleeve, possibly with a longitudinal gap between wheels or groups of wheels.
- the pinch roll assembly which can be seen in Figures 3, 4 and 7 and is generally designated 60, comprises a pinch roll 61 coated with a layer of material suitable to create a drawing or gripping contact on the pipe, for example a rubber-type material that can grip the pipe and is integral with a shaft 62 taking its drive from the drive shaft of a motor 63.
- the assembly is supported by a rocker arm 66 mounted rocking on an upright 67 fixed to the bed.
- the position of the roller with respect to the pipe is determined by means of a cylinder-piston assembly 68, connected to the bed and to the arm 66.
- Feeding of the pipe is determined by rotation thereof, due to the pinch roll, in contact with the rollers 20 disposed with their axes oblique with respect to the axis of the pipe.
- Reference numeral 70 denotes a dust suction slit.
- An air-cooling tunnel (not illustrated) can be provided along the course of the pipe. It is not necessary to use cooling liquids.
- Reference numeral 74 denotes a sensor to detect the presence of the pipe.
- the surface finishing that is obtained is good and uniform over the whole pipe, since the brushes are brought nearer to the axis of the pipe as they wear and no overheating and consequent deformations occur.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Handcart (AREA)
Abstract
Description
- The present invention refers to the field of surface finishing of pipes.
- US-A-5 371 972 discloses an apparatus for surface finishing of a pipe comprising means rotatably supporting the pipe, means to make the pipe rotate around its own axis, means to feed the pipe in the direction defined by its own axis, a brush element and means for positioning and for driving in rotation said brush element.
- A brushing treatment on the outside surface of pipes by means of rotating brushes is known, in lines for the production of pipes starting from sheet metal, using a brush-holding head that turns around the pipe. In these systems the pipe advances without rotating. The finishing obtained is not precise and therefore the procedure cannot be used when a precision finishing is required.
- It is also known to cany out more precise surface finishing on pipes, generally satin finishing, by means of abrasive belts. The pipe is supported on a bed of idle rollers and it is made to advance and to turn round its own axis by means of a motorised pinch roll. Each abrasive belt is endless and is wound on wheels, one of which is a rubber-coated drive wheel that presses the abrasive belt against the pipe. The operation is generally carried out by working on the pipe with a succession of belts of different grain, that is, in practice, by passing the pipe along belts with different grains. A problem of this type of finishing is the great wear on the abrasive belts, which could involve that an ever different type of finishing is obtained on successive parts of the product. To overcome this drawback, the operator is obliged to change the belt often, using the worn belts in different positions until they are worn out, and this leads to a considerable waste of time.
- A further drawback is the need to lubricate the pipe with plenty of water in the area of friction thereof with the belt, and the use of water or other liquid for lubrication and cooling leads to the production of sludge, which is difficult and laborious to dispose of. Furthermore, water is a cause of deterioration of the fixed or moving mechanical parts and the sludge produced must be manually removed from the line by the operators, with a resulting waste of time.
- Lastly, in the area of friction between the belt and the pipe there is considerable development of heat, which can lead to a loss of straightness of said pipe.
- To overcome the abovementioned drawbacks, the machine and the procedure disclosed in claims 1 and 6 have been devised.
- In other words, the procedure comprises the stages of operating on a pipe advancing along its own axis and rotating with a plurality of lamellar wheels or brushes placed alongside the pipe and rotating around an axis which is generally parallel to the axis of the pipe.
- The apparatus comprises a bed of idle rollers supporting the pipe, a brush-holding sleeve mounted on a support adjustable in position with respect to the pipe bed, means for causing the pipe to advance and to rotate and means to determine the position of the brush-holding sleeve.
- The invention makes it possible to overcome the aforementioned drawbacks, in particular to obtain an excellent level of surface finishing of the pipe (from satin finishing to polishing), and to avoid overheating and the resulting deformations of the pipe, though without requiring the use of cooling liquids.
- An embodiment of the invention will be described below purely by way of nonlimiting example and with reference to the appended figures, in which:
- Figure 1 is a partially schematic front view of the apparatus, with the idle rollers of the pipe-supporting bed illustrated in a position with their axes parallel to the axis of the pipe; two possible configurations of the pipe under production are illustrated, one with the maximum diameter and one with the minimum diameter,
- Figure 2 is a plan view of the apparatus of Figure 1; the lamellar wheels or brushes and the sleeve whereon they are mounted are drawn with a dashed line and the pipe under production has been omitted for the sake of clarity of the drawing; the pipe-supporting idle rollers are illustrated in an oblique arrangement with respect to the axis of the pipe, that is to the advance direction;
- Figure 3 is a side view from the left with respect to Figure 1, with the idle rollers in the arrangement of Figure 2;
- Figure 4 is a rear view of the apparatus, that is to say from the opposite side to that illustrated in Figure 1,
- Figure 5 is a section along the vertical plane marked 5-5 in Figure 1;
- Figure 6 is a section along the plane marked 6-6 in Figure 1 and illustrates one of the pivot supports of a rocker arm which carries the sleeve with the lamellar wheels;
- Figure 7 is a section along the vertical plane marked 7-7 in Figure 1;
- Figure 8 is a section along the vertical plane marked 8-8 of Figure 4, but illustrates only the pinch roll, in the arrangement thereof with the axis parallel to the axis of the pipe.
- Referring first to Figure 1, an apparatus for surface finishing of pipes according to the present invention is generally designated 10 and comprises, on a
bed 12, a pipe supporting and feeding bed, designated 14, and a finishing unit, hereunder also called a grinding unit, designated 16. - The pipe under production will hereunder be denoted generically by T; in Figure 1 a maximum diameter pipe T1 and a minimum diameter pipe T2, such as can be finished with the apparatus of the invention, have been drawn.
- The pipe supporting and
feeding bed 14 comprises a plurality ofroller assemblies 18, each comprising one or more rollers orwheels 20 idle around generally horizontal axes a20. The roller assemblies are generally disposed on two rows, offset or in a quincunx, that is to say one on one side and the next, shifted longitudinally by a distance, on the other side of a runway for the pipe, which they define. - Each
roller assembly 18 comprises afixed frame 20 fixed to the bed and amoveable frame 24 thereon, rocking around a horizontal axis a24 under the control of a cylinder-piston 25. The rocking controlled by the cylinder-piston assemblies 25 disposes theframes 24 in a more or less upwardly widened position and, consequently, sets the rollers in a position more or less close to each other to adapt them to pipes to be treated of different diameters. On eachrocking frame 24 there is installed anadjustable frame 26 bearing the roller, which can be rotated, by not illustrated means, around the respective vertical axis a26 to dispose the respective roller at the desired angle with respect to the axis of the pipe. - Above the
roller bed 14, according the invention, a brush-holding shaft or sleeve 30 of the grinding unit 16 (Figures 3, 5) is supported. The brush-holding sleeve has a horizontal axis a30 parallel to the axis aT of the pipe and is rotatably supported, through two enduniversal joints 33 and 33', on theside arms 34 and 34' of arocking arm structure 35 of theunit 16. - The
arms 34, 34' are each mounted on asupport 36, respectively 36', fixed to the bed, by means of a pivot part 37 (Figure 6) which defines a horizontal rocking axis a16 for theunit 16. - The
arm 34 of the structure carries amotor 40 for rotation of the brushes, visible in Figures 2 and 7. Themotor 40 has adrive shaft 41 which bears adrive pulley 42. Abelt 43 transmits the motion to a drivenpulley 44 integral with the pivot of auniversal joint 33, of the end universal joints of the brush-holding shaft. - The
unit 16 rocks therefore around the axis a16 defined by thepivots 37. To define the position of theunit 16 around the axis a16, an element of a cylinder-piston assembly 48, the other element of which is connected to thebed 12, acts on the part of thestructure 34 opposite the brush-holding shaft. Alinear transducer 50 of the optical or incremental type, per se known, is also mounted between the bed and the same part of the brush-holding structure to allow adjustment of the position of the brushes with respect to the pipe in view of the diameter of the pipe and of the wear of the brushes. The brushes used are preferably lamellar rotating brushes ("wheels"), available on the market and denoted by S in the figures. Said lamellar wheels comprise a body, generally of plastic material, and radial foils extending from the body, generally consisting of cotton or polyester cloths, or of wheels of different materials that have abrasive incorporated, with or without abrasive powders applied. Lamellar wheels preferably from 10 to 500 mm in diameter and lengths from 100 to 1000 mm can be used. The wheels are locked in a pack on the sleeve, possibly with a longitudinal gap between wheels or groups of wheels. - Rotation of a pipe T under production (T1, T2) around its own axis is determined by means of one or more pinch rolls, per se known. The pinch roll assembly, which can be seen in Figures 3, 4 and 7 and is generally designated 60, comprises a
pinch roll 61 coated with a layer of material suitable to create a drawing or gripping contact on the pipe, for example a rubber-type material that can grip the pipe and is integral with ashaft 62 taking its drive from the drive shaft of amotor 63. The assembly is supported by arocker arm 66 mounted rocking on an upright 67 fixed to the bed. The position of the roller with respect to the pipe is determined by means of a cylinder-piston assembly 68, connected to the bed and to thearm 66. - Feeding of the pipe is determined by rotation thereof, due to the pinch roll, in contact with the
rollers 20 disposed with their axes oblique with respect to the axis of the pipe. -
Reference numeral 70 denotes a dust suction slit. An air-cooling tunnel (not illustrated) can be provided along the course of the pipe. It is not necessary to use cooling liquids. -
Reference numeral 74 denotes a sensor to detect the presence of the pipe. - The surface finishing that is obtained is good and uniform over the whole pipe, since the brushes are brought nearer to the axis of the pipe as they wear and no overheating and consequent deformations occur.
Claims (7)
- Apparatus for surface finishing of a pipe, for example satin finishing or polishing, comprising means (14) to support the pipe rotatably around its own axis, means (60) to make the pipe rotate around its own axis, means to feed the pipe in the direction defined by its own axis, brush-holding means assembling a plurality of rotating lamellar finishing brushes or wheels (S), means (48) for positioning said brush-holding means and means (42) for driving said brush-holding means in rotation, characterised in that said brush-holding means comprises a brush-holding sleeve (30), whose axis (a30) is substantially parallel to the axis of the pipe under production, which is rotatably supported by two end universal joints (33, 33') on side arms (34, 34') each pivotally mounted on a support (36, 36') respectively.
- Apparatus according to claim 1, characterised in that the breish-holding means comprise a sleeve (30) carried on a rocker arm support (35) mounted on supports (36) which define a rocking axis (a16) of the support parallel to the axis of the pipe.
- Apparatus according to claim 1, characterized in that the means for supporting the pipe rotatably comprise an idle roller bed wherein the idle rollers are disposed according to a quincunx arrangement.
- Apparatus according to claim 3, characterized in that each roller has its axis of rotation (a 20) adjustable around a vertical axis (a26).
- Apparatus according to claim 4 wherein the rollers (20) are supported so as to be able to be moved away from or toward each other to adapt to pipes of different diameters.
- A finishing procedure on the outer surface of pipes through an apparatus according to at least one of the previous claims, characterized in that brush-holding means comprising a brush-holding sleeve (30) - whose axis (a30) is substantially parallel to the axis of the pipe under production - rotatably supported by two end universal joints (33, 33') on side arms (34, 34') each pivotally mounted on a support (36, 36') respectively are used and in that the pipe is fed along a feeding axis coinciding with the longitudinal axis of the pipe and, at the same time, it is made to rotate around said axis.
- A procedure according to claim 6, characterized in that the position of the axis of rotation of the brushes is adjusted with respect to the axis of the pipe.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20020684 | 2002-04-02 | ||
IT2002MI000684A ITMI20020684A1 (en) | 2002-04-02 | 2002-04-02 | EQUIPMENT AND PROCEDURE FOR SURFACE FINISHING OF TUBES VIA FLAP WHEELS |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1350600A1 EP1350600A1 (en) | 2003-10-08 |
EP1350600B1 true EP1350600B1 (en) | 2006-04-26 |
EP1350600B8 EP1350600B8 (en) | 2006-06-21 |
Family
ID=11449622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03004196A Expired - Lifetime EP1350600B8 (en) | 2002-04-02 | 2003-02-27 | Apparatus and procedure for surface finishing of pipes by means of lamellar wheels |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1350600B8 (en) |
AT (1) | ATE324224T1 (en) |
DE (1) | DE60304762T2 (en) |
ES (1) | ES2263860T3 (en) |
IT (1) | ITMI20020684A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007038287A1 (en) | 2007-08-14 | 2009-02-19 | Lars Struckmann | Cylindrical, bottle-like and box-like or rotation symmetric parts circumferential surface polishing method, involves guiding disk with center line perpendicular to gradient of surface contour of parts during constant contact pressure |
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ITMI20041641A1 (en) * | 2004-08-10 | 2004-11-10 | Olimpia 80 Srl | LAMELLAR WHEELS SATINING SYSTEM FOR SHAPED TUBES |
ITMI20052123A1 (en) | 2005-11-08 | 2007-05-09 | Olimpia 80 Srl | PLANT FOR SATIN FINISHING OF SHEETS BY LAMELLAR WHEELS WITH MECHANICAL FIXING |
CN101249638B (en) * | 2008-03-20 | 2010-06-02 | 北京古日机电科技有限公司 | Device driving object up-down and automatic grinding mill |
CN102049721A (en) * | 2009-10-29 | 2011-05-11 | 陆惠琪 | Automatic polishing machine |
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CN103009223A (en) * | 2012-12-05 | 2013-04-03 | 广州高澜节能技术股份有限公司 | Cylinder polishing machine |
CN103072067A (en) * | 2013-01-25 | 2013-05-01 | 汪正友 | Polishing wheel type selection and configuration for improving surface polishing quality of stainless steel composite pipe |
CN103144015B (en) * | 2013-03-29 | 2015-03-25 | 苏州市职业大学 | Titanium pipe friction rolling mechanism |
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CN103659495A (en) * | 2013-11-30 | 2014-03-26 | 南通宝田包装科技有限公司 | Cylinder polishing device |
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CN104440490A (en) * | 2014-12-15 | 2015-03-25 | 济南玛钢钢管制造有限公司 | Automatic derusting machine of steel pipes |
CN105108626A (en) * | 2015-09-08 | 2015-12-02 | 河南省天利工业炉有限公司 | Cylindrical cast steel polisher |
CN106826505A (en) * | 2016-12-29 | 2017-06-13 | 中车西安车辆有限公司 | A kind of sander |
JP7028565B2 (en) * | 2017-03-08 | 2022-03-02 | Jfe建材株式会社 | Pipe surface polishing method |
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CN108515442A (en) * | 2018-04-04 | 2018-09-11 | 浙江久立特材科技股份有限公司 | A kind of steel pipe surface intelligence burnishing device |
CN111037378A (en) * | 2019-11-28 | 2020-04-21 | 安徽永茂泰汽车零部件有限公司 | Surface treatment equipment for machining automobile casting parts |
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CN111745474A (en) * | 2020-07-06 | 2020-10-09 | 湖北华越汽车零部件有限公司 | Polishing device for production and processing of vehicle brake nylon pipeline and use method thereof |
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CN112059762A (en) * | 2020-09-24 | 2020-12-11 | 缙云县恩润工业设计有限公司 | Machining is with round roller outer wall grinding device |
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US3503156A (en) * | 1967-09-26 | 1970-03-31 | Engelberg Inc | Centerless grinding system |
US4107880A (en) * | 1976-02-02 | 1978-08-22 | Randall John P | Floating buffing wheel assembly |
IT1213147B (en) * | 1984-03-06 | 1989-12-14 | Sillem Spa | MACHINE FOR ABRASIVE PROCESSING WITHOUT CENTER OF TUBES, BARS AND SIMILAR. |
US5311652A (en) * | 1992-05-26 | 1994-05-17 | Shaw Industries Ltd. | Method of improving the surface of steel pipe for corrosion resistant coating |
-
2002
- 2002-04-02 IT IT2002MI000684A patent/ITMI20020684A1/en unknown
-
2003
- 2003-02-27 AT AT03004196T patent/ATE324224T1/en not_active IP Right Cessation
- 2003-02-27 DE DE60304762T patent/DE60304762T2/en not_active Expired - Lifetime
- 2003-02-27 EP EP03004196A patent/EP1350600B8/en not_active Expired - Lifetime
- 2003-02-27 ES ES03004196T patent/ES2263860T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007038287A1 (en) | 2007-08-14 | 2009-02-19 | Lars Struckmann | Cylindrical, bottle-like and box-like or rotation symmetric parts circumferential surface polishing method, involves guiding disk with center line perpendicular to gradient of surface contour of parts during constant contact pressure |
Also Published As
Publication number | Publication date |
---|---|
ATE324224T1 (en) | 2006-05-15 |
DE60304762T2 (en) | 2007-04-26 |
ES2263860T3 (en) | 2006-12-16 |
EP1350600A1 (en) | 2003-10-08 |
EP1350600B8 (en) | 2006-06-21 |
DE60304762D1 (en) | 2006-06-01 |
ITMI20020684A1 (en) | 2003-10-02 |
ITMI20020684A0 (en) | 2002-04-02 |
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