CN102205438A - Equipment and method for milling inner surface of bent pipe - Google Patents

Equipment and method for milling inner surface of bent pipe Download PDF

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Publication number
CN102205438A
CN102205438A CN 201110137311 CN201110137311A CN102205438A CN 102205438 A CN102205438 A CN 102205438A CN 201110137311 CN201110137311 CN 201110137311 CN 201110137311 A CN201110137311 A CN 201110137311A CN 102205438 A CN102205438 A CN 102205438A
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bend pipe
guide rail
servomotor
equipment
arc
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CN 201110137311
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CN102205438B (en
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王续跃
孙建立
高航
刘巍
杨连文
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Dalian University of Technology
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Dalian University of Technology
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Abstract

The invention belongs to the field of large-scale heavy load part processing and relates to equipment and a method for milling the inner surface of a bent pipe. The equipment comprises an equipment machine body, a vertical column, a supporting rod, a clamping device, a revolution milling device, a workbench and a guide rail. The machining of the inner surface of the arc line section of the bent pipe is realized in a mode of guide rail leading matched with gear transmission by matching the circular motion along the guide rail and the revolution motion around a slide block, and through the screw feed cutting motion along the bus of the bent pipe under the drive of a servo motor. The equipment can perform transmission stably and reliably; the mechanism has a simple design; the control mode is simple and direct; the cutting state is stable; the cutting impact load is small; and the surface quality, the efficiency and accuracy are high. The equipment and the method are suitable for processing the inner surfaces of the arc line sections of various large-and-medium-sized bent pipe parts.

Description

A kind of Milling Process Apparatus and method for of bend pipe inner surface
Technical field
The invention belongs to large-scale heavy duty part processing field, relate to a kind of Milling Process Apparatus and method for of bend pipe inner surface.
Background technology
The bend pipe part plays a part very crucial in the engineering field, and some bend pipe parts need carry out mechanical cold working to it and ensure the quality of products.Cooling agent trunk line in the nuclear power station is the large thick-wall pipeline of coupled reaction core pressure vessel and steam generator, is one of 1 grade of critical component of nuclear of nuclear power station.What the third generation AP1000 nuclear power technology of China's introduction at present adopted is the manufacturing of monobloc forging formula, and itself does not have weld seam trunk line, has reduced the inservice inspection workload, has improved service life.The machining process route of third generation trunk line is forging-machined-bend-fine finishining.The defective of the trunk line surfaces externally and internally that the bending technique process causes is inevitable, therefore must carry out fine finishining to inner surface.When third generation trunk line monobloc forging formula integral forming mode was brought up to 60 years with service life by 40 years on the one hand, also greatly increased final accurately machined difficulty on the other hand.
Third generation monobloc forging formula trunk line is by two sections straightways and one section middle tangent being formed by connecting of arc at two ends.It is special complex-curved that bending technique makes inner surface become by the face of cylinder of script rule, constituted a kind of elongated special-shaped enclosed cavity structure.The curved surface of trunk line arc be the bending of two vertical direction constitute complex-curved, curvature changes greatly, thereby causing adding the cutter position that contacts with piece surface man-hour constantly changes, cutting state constantly changes, the shock loading that produces is big and change violent, processing lines density inequality causes crudy inconsistent.It is seriously limited that simultaneously inner surface adds the area of space that is used for holding cutter man-hour, cutter can only stretch out from the pipeline oral area, and movable space is little, has limited the athletic posture of cutter largely, cutter and part very easily produce interference, cause finishing the processing to whole bend pipe inner surface.Therefore how to avoid the interference of cutter and part in available space, reduce the shock loading in the machining simultaneously, the surface quality after the final assurance processing is the problem that the processing of trunk line inner surface faces.
Follow-up machining at the pipeline after the bending does not have the mature technique method and apparatus at present.The particularly inner surface processing of monobloc forging formula trunk line after bending, domestic only have application for a patent for invention number to be 200910210449.X, the patent of " the AP1000 nuclear power technology one primary loop piping bend pipe finish machining equipment for inner bore " of Yantai Taihai Manoir Nuclear Equipment Co., Ltd. adopts the power boring head that can swing, finishes the processing of bend pipe inner surface.This method needs specialized designs boring unit head, follows the bend pipe bending with algorithm control unit head and carries out corresponding swing, and mechanism adopts the worm and gear transmission, and efficient is low, and owing to wearing and tearing cause precision not high greatly.Greatly develop in China under the background of nuclear power industry, by adopting advanced technical method and equipment, formation system, the process technology of bend pipe inner surface efficiently for the production domesticization that realizes China's third generation nuclear power generating equipment provides technical support, have very significant meaning and value.
Summary of the invention
The invention provides a kind of Milling Process equipment of bend pipe inner surface, overcome the defective of prior art, particularly a machining bend pipe part inner surface ten minutes difficult technologies difficult problem.The present invention adopts the mode of rail guidance mate gear transmission, stable drive, reliable, and the efficient height, the precision height overcomes the defective that transmission efficiency is low, precision is low that has the power boring equipment that can swing now, has realized the machining of bend pipe arc inner surface.
The technical solution used in the present invention is as follows:
A kind of Milling Process equipment of bend pipe inner surface comprises equipment lathe bed, column, support bar, clamping device, revolution milling attachment, workbench and guide rail; On the equipment lathe bed guide rail is installed, the workbench that can move along the X-direction of equipment lathe bed is installed on the guide rail, the clamping device of fixing processing bend pipe part is installed on the workbench; Be installed with column on the equipment lathe bed, column is fixedly connected with support bar, and the front end of support bar is fixedly connected with the revolution milling attachment of being made up of arc-shaped guide rail pair.
Described revolution milling attachment comprises bearing, band tooth arc guide rail and the adjustable bracing frame of first gear, first servomotor, circular arc slide block, second servomotor, second gear, electric main shaft, band gear ring; Band tooth arc guide rail is fixedly connected on the support bar end, and its two ends are equipped with adjustable bracing frame; On the band tooth arc guide rail circular arc slide block that slides along guide rail is installed also, is installed with first servomotor on the circular arc slide block, first servomotor is connected with and with first gear of tooth arc guide rail engagement; Also be installed with the bearing of band gear ring on the circular arc slide block, be fixed with the electric main shaft of cutting on the bearing of band gear ring; Also be installed with second servomotor on the circular arc slide block, second servomotor is connected with and with second gear of the bearing of gear ring engagement.
The present invention adopts the arc guide rail more than one or two to be used, and when using two above arc guide rails, mounting means has two kinds: a kind of employing horizontal Tile is laid, the anti-better effects if of toppling; The pairing of a kind of employing symmetry is laid, and the stability of revolution cutting is higher.
The positive effect that the present invention has has:
(1) by by the circular motion of the circular arc slide block of band tooth arc guide rail guiding and the compound motion that forms based on the gyration of circular arc slide block, being cutter shaft radially does screwfeed campaign along the vertical generatrix direction of bend pipe towards the bend pipe circumference, drive electric main shaft and cutter, realized the processing of bend pipe arc inner surface.
(2) removal amount changes gently, and cutting state is more consistent, effectively reduces the cutting shock loading, and the surface quality uniformity is better, can reach Ra3.2 and above roughness requirement.
(3) the circular arc slide block is controlled by the servomotor of band brake along the slip of arc guide rail and the gyration of cutting electric main shaft, has realized accurate speed control and Position Control.
(4) design of this equipment mechanism is simpler, and driving-chain is short, and control mode is simply direct, and processing method is applicable to the processing of the arc inner surface of all kinds of bend pipe class parts.
Description of drawings
Accompanying drawing 1 is a process equipment overall structure schematic diagram.
Accompanying drawing 2 is connection front views of each part of revolution milling attachment.
Accompanying drawing 3 is connection A-A cutaway views of each part of revolution milling attachment.
Accompanying drawing 4 is connection vertical views of each part of revolution milling attachment.
Accompanying drawing 5 is adjustable supporter schematic diagrames.
Among the figure: 1 equipment lathe bed, 2 columns, 3 support bars, 4 clamping devices, 5 revolution milling attachments, 6 workbench, 7 guide rails;
5-1 first gear, 5-2 first servomotor, 5-3 circular arc slide block, 5-4 second servomotor, 5-5 second gear, 5-6 electricity main shaft, the bearing of 5-7 band gear ring, 5-8 band tooth arc guide rail, the bracing frame that 5-9 is adjustable.
The specific embodiment
Describe the specific embodiment of the present invention in detail with technical scheme in conjunction with the accompanying drawings, this Apparatus and method for is implemented on the typical trunk line part, finished the processing of arc inner surface.Trunk line belongs to the large thick-wall pipeline, and heavily about 11 tons, outer surface has two angled pressure inlets, and the two ends straightway is connected with arc is tangent.Line size is that internal diameter Φ 785mm, external diameter Φ 965mm, arc angle of bend are 56.4 °, and the two ends length of straigh line is respectively 2560.3mm and 1234.2mm.As shown in Figure 1, process equipment is based on that the equipment lathe bed constitutes, and comprises equipment lathe bed, column, support bar, clamping device, revolution milling attachment, workbench and guide rail.On the equipment lathe bed guide rail is installed, the workbench that can move along guide rail is installed on the guide rail, moving direction is the directions X along the equipment lathe bed, drives workbench and drives ball-screw by stepper motor and realize.Moving along equipment lathe bed X-axis of workbench is in order to adjust the position that bend pipe is fixed in the X-axis behind the workbench.
The clamping device of fixing processing bend pipe part is installed on the workbench.The position of clamping device fixed bending tube part is at the straightway outer surface of a parallel end with X-axis.Clamping device is made of soon fixed block and activity, and fixed block plays the effect of determining the Y-axis position simultaneously, relies on during work and manually can finish location clamping work.
Also be installed with column on the equipment lathe bed, column is fixedly connected with the support bar that is horizontal, and in view of the bend pipe size is bigger, the cantilever that support bar stretches out is very long, for keeping balance, can balance weight be installed in the other direction at support bar and reduce owing to lay particular stress on the distortion that brings.
The front end of support bar is fixedly connected with the revolution milling attachment of being made up of arc-shaped guide rail pair.This device is a critical piece of finishing the processing of bend pipe arc inner surface.Be divided into four module main the composition, as Fig. 2, Fig. 3 and Fig. 4:
First module: circular motion module.Comprise band tooth arc guide rail, circular arc slide block, be fixed in first servomotor and first gear on the circular arc slide block.The tooth of band tooth arc guide rail can directly be processed in the guide rail inboard, also arc rack can be fixed in the guide rail inboard.One end of band tooth arc guide rail is fixedlyed connected with support bar.Its rigidity relies on support bar to guarantee with the adjustable bracing frame of fixedlying connected with its two ends.The arc center of the center of arc of arc guide rail and bend pipe overlaps, and its effect is that guiding circular arc slide block is done accurate and the concentric circular motion of bend pipe arc along bend pipe center bus.The power of circular motion is provided by first servomotor, by driving first gear that meshes with band tooth arc guide rail, realizes the circular arc feed motion.First servomotor has the self-retention function, can realize accurate speed and Position Control.
Second module: gyration module.Comprise second servomotor that is fixed on the circular arc slide block and second gear and and the bearing of the band gear ring of second gears engaged.The parts of this module are all attached on the circular arc slide block, and second servomotor drives the rotation of second gear, and the bearing of the second gear driven band gear ring and the electric main shaft that is fixed in the above carry out gyration.For making things convenient for the installation of miscellaneous part, the shape fabricating of circular arc slide block is that the part of fixing two motors is square, and the part of the bearing of fixed band gear ring is a circular arc.The outer ring one side band tooth of bearing of band gear ring, as the second gear meshing part that drives with second servomotor, opposite side is fixed with electric main shaft.Second servomotor has the self-retention function equally, can realize accurate speed and Position Control.
The 3rd module: electric main shaft cutting module.Comprise electric main shaft and cutting tool on the bearing that is fixed in the band gear ring.Electricity main axle structure compactness, in light weight, inertia is little, vibration is little, response is fast, power is big, design greatly simplifies the structure.The electricity main shaft is subsidiary annexes such as high frequency converter plant, oil mist lubricator, cooling device, built-in encoder, tool changing device, can be easily process velocity etc. be controlled.
Four module: supporting module.Mainly comprise the adjustable bracing frame that is fixed in band tooth arc guide rail two ends.The function of this module improves revolution milling attachment whole rigidity and stability exactly, thereby guarantees crudy and stock-removing efficiency.
The using method of Milling Process equipment of the present invention, concrete steps are as follows,
(1) prepares processing object and process equipment etc.Be bend pipe part, present device and cutter etc.;
(2) on the equipment workbench, bend pipe is positioned and clamps.Utilize the bend pipe outer surface that it is positioned, at first bend pipe is lain against on the workbench of process equipment, bend pipe outer surface and workbench are close together, and then utilize the workbench surface just bend pipe to be carried out Z to accurate location; Mobile bend pipe makes the straightway of an end of its appointment be in the X-direction of equipment, mobile gently bend pipe makes straightway part outer surface abut in the fixed block of clamping device, thus determined Y to accurate location; The manual closing clamping device carries out fasteningly simultaneously to proper site such as the bend pipe other ends, prevent to have in process loosening.After clamping bend pipe, drive ball-screw by stepper motor, ball-screw drives workbench, adjust bend pipe equipment X to the position, finally determine X to the exact position, the clamping and the location of so far having finished bend pipe.
(3) the revolution milling attachment is installed.In the clamping process of location, support bar just has been deep into the inside of bend pipe, also just has been in the accurate position of Milling Process after the bend pipe location clamps.To turn round milling attachment is fixed on the support bar, relatively accurate position based on equipment lathe bed, support bar and bend pipe, so device also is in the tram of processing, i.e. the arc guide rail and the concyclic heart of bend pipe bus, the device centre of gyration and the concyclic heart in bend pipe cross section and be in accurate position along bend pipe generatrix direction device.The bolt of rotation adjustable supporter upper support pin, the feet length of regulating the adjustable support frame makes bracing frame stable support package unit, makes the device work in-process that enough rigidity and stability be arranged.
(4) processing beginning.At first device is adjusted to the cutting starting point, i.e. an end of bend pipe arc.Control electric main shaft then and drive the cutter rotation, regulate the micro-adjusting device that places on the electric main shaft, realize that electric main shaft drives cutter along bend pipe microfeed radially, finishes tool setting.Continue to feed to accurate position according to set cutting depth consumption then.Control swivel feeding then and drive that second servomotor drives electric main shaft and cutter turns round cutting.Attention: be not activated the circular arc feeding and drive first servomotor this moment, carries out the no circular arc length feed machining in 2~3 weeks, and purpose is the stable and crudy that guarantees to cut cutter.Start the circular arc feeding afterwards and drive first servomotor, cooperate swivel feeding to drive second servomotor and carry out cutting, to the other end, and then finish the processing of bend pipe arc inner surface from an end of bend pipe arc along the screwfeed of bend pipe bus with electric main shaft.Drive the rotating speed that first servomotor and swivel feeding drive second servomotor by the electric main shaft of accurate control, circular arc feeding in the process, realize control cutting surface pattern and quality.When being machined to the arc other end, when promptly processing end stage, job step and previous opposite, promptly the feeding of braking circular arc drives first servomotor earlier, stops the feeding of circular arc direction, finishes after the no length feed machining in 2~3 weeks, the brake rotary feeding drives second servomotor, stop to turn round cutting movement, utilize micro-adjusting device to make cutter then, stop electric main shaft at last towards circumference opposite direction withdrawing radially.
(5) the turning down milling attachment is unloaded in the support of releasing adjustable supporter, unclamps clamping device, unloads bend pipe, process finishing.
This equipment and method are applicable to all kinds of big-and-middle-sized bend pipe part arc inner surface processing, the bend pipe class part that especially draw ratio is big, angle of bend is big.Mechanism design is simple, and driving-chain is short, and control mode is simply direct, and cutting state is stable, and the cutting shock loading is little, and surface quality is good, the efficient height.

Claims (3)

1. the Milling Process equipment of a bend pipe inner surface comprises equipment lathe bed (1), column (2), support bar (3), clamping device (4), revolution milling attachment (5), workbench (6) and guide rail (7); It is characterized in that: guide rail (7) is installed on the equipment lathe bed (1), the workbench (6) that can move along equipment lathe bed (1) X-direction is installed on the guide rail (7), the clamping device (4) of fixing processing bend pipe part is installed on the workbench (6); Be installed with column (2) on the equipment lathe bed (1), column (2) is fixedly connected with support bar (3), and the front end of support bar (3) is fixedly connected with the revolution milling attachment of being made up of arc-shaped guide rail pair (5);
Revolution milling attachment (5) comprises the bearing (5-7), band tooth arc guide rail (5-8) of first gear (5-1), first servomotor (5-2), circular arc slide block (5-3), second servomotor (5-4), second gear (5-5), electric main shaft (5-6), band gear ring, adjustable bracing frame (5-9); Band tooth arc guide rail (5-8) is fixedly connected on support bar (3) end; Band tooth arc guide rail (5-8) two ends are equipped with adjustable bracing frame (5-9); The circular arc slide block (5-3) that slides along guide rail also is installed on the band tooth arc guide rail (5-8), be installed with first servomotor (5-2) on the circular arc slide block (5-3), first servomotor (5-2) is connected with and with first gear (5-1) of tooth arc guide rail (5-8) engagement; Also be installed with the bearing (5-7) of band gear ring on the circular arc slide block (5-3), be fixed with electric main shaft (5-6) on the bearing (5-7) of band gear ring; Also be installed with second servomotor (5-4) on the circular arc slide block (5-3), second servomotor (5-4) is connected with and with second gear (5-5) of the bearing (5-7) of gear ring engagement.
2. Milling Process equipment according to claim 1, its feature also are, adopt one or two above arc guide rails, when using two above arc guide rails, it are carried out horizontal Tile is laid or the symmetry pairing is laid.
3. the using method of claim 1 or 2 described Milling Process equipment is characterized in that following steps,
Prepare before a, the processing: upward bend pipe is positioned and clamps at equipment workbench (6); With the bend pipe outer surface is that benchmark positions bend pipe, utilize the fixed block and the work top of clamping device (4), finish Y to Z to the location, closed then clamping device (4), then by stepper motor drive ball-screw drive workbench along equipment X to moving, finish X to the location; Revolution milling attachment (5) is installed at last; To turn round milling attachment (5) accurately is fixed on the support bar (3), relatively accurate position based on equipment lathe bed (1) and support bar (3) and bend pipe, device also is in the accurate position of processing, i.e. the arc guide rail and the concyclic heart of bend pipe bus, the device centre of gyration and the concyclic heart in bend pipe cross section and also be in accurate position along bend pipe generatrix direction device; By regulating the feet length of adjustable bracing frame (5-9), make bracing frame (5-9) stable support package unit;
B, processing: at first slide block is placed the cutting starting point, i.e. an end of bend pipe arc; Control electric main shaft (5-6) then and drive the cutter rotation, regulate the micro-adjusting device that places on the electric main shaft (5-6), realize that electric main shaft (5-6) drives cutter along bend pipe microfeed radially, finishes tool setting; Continue to feed to accurate position according to set cutting depth consumption then; Control swivel feeding then and drive that second servomotor (5-4) drives electric main shaft (5-6) and cutter turns round cutting, promptly carry out the no circular arc length feed machining in 2~3 weeks; Start the circular arc feeding afterwards and drive first servomotor (5-2), cooperating swivel feeding to drive second servomotor (5-4) carries out cutting along the screwfeed of bend pipe bus with electric main shaft (5-6), to the other end, and then finish the processing of bend pipe arc inner surface from an end of bend pipe arc; Drive the rotating speed that first servomotor (5-2) and swivel feeding drive second servomotor (5-4) by accurately control electric main shaft (5-6), circular arc feeding in the process, realization is to the control of cutting surface pattern and quality; When being machined to the arc other end, when promptly processing end stage, job step and previous opposite, promptly the feeding of braking circular arc drives first servomotor (5-2) earlier, stops the feeding of circular arc direction, finishes after the no length feed machining in 2~3 weeks, the brake rotary feeding drives second servomotor (5-4), stop to turn round cutting movement, utilize micro-adjusting device to make cutter then, stop electric main shaft (5-6) at last towards circumference opposite direction withdrawing radially;
C, end processing; Remove the support of adjustable supporter (5-9), unload turning down milling attachment (5), unclamp clamping device (4), unload bend pipe.
CN201110137311A 2011-05-24 2011-05-24 Equipment and method for milling inner surface of bent pipe Expired - Fee Related CN102205438B (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179555A (en) * 2011-06-09 2011-09-14 大连理工大学 Device and method for milling internal surface of bent pipe
CN102513790A (en) * 2011-12-08 2012-06-27 舟山市恒瑞汽配有限公司 Processing method for rotating shaft of sunshading board
CN103506654A (en) * 2013-10-11 2014-01-15 一重集团绍兴重型机床有限公司 Mechanism for machining holes inside pipeline
CN103521803A (en) * 2013-10-11 2014-01-22 一重集团绍兴重型机床有限公司 Inner hole machining device of pipeline arc bend
CN103862225A (en) * 2012-12-14 2014-06-18 上海重型机器厂有限公司 Processing method for inner hole of elbow of nuclear power main pipeline
CN105215765A (en) * 2015-10-08 2016-01-06 四川大学 A kind of tubular body surface processing device
CN105834496A (en) * 2016-04-28 2016-08-10 齐齐哈尔精工伟业机床有限公司 Multifunctional milling machine for milling in large-diameter inner hole
CN106965019A (en) * 2017-04-13 2017-07-21 上海司恩金属加工技术有限公司 The special machine tool that a kind of crystallizer copper pipe embedded SMA actuators are used
CN107538053A (en) * 2017-09-15 2018-01-05 西安航空职业技术学院 A kind of circular arc elbow internal wall machining tool
CN108637277A (en) * 2018-07-15 2018-10-12 赖旭亮 It is bent class workpiece surface high-precision turning process and its process equipment
CN108645337A (en) * 2018-04-27 2018-10-12 北京理工大学 A kind of depth inside pipe wall Surface Location Error on-line measurement and compensation method
CN108724300A (en) * 2018-05-24 2018-11-02 夏文斌 A kind of portable processing unit (plant) of heavy caliber PP pipes
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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179555B (en) * 2011-06-09 2012-07-04 大连理工大学 Device and method for milling internal surface of bent pipe
CN102179555A (en) * 2011-06-09 2011-09-14 大连理工大学 Device and method for milling internal surface of bent pipe
CN102513790A (en) * 2011-12-08 2012-06-27 舟山市恒瑞汽配有限公司 Processing method for rotating shaft of sunshading board
CN102513790B (en) * 2011-12-08 2014-12-03 舟山市恒瑞汽配有限公司 Processing method for rotating shaft of sunshading board
CN103862225A (en) * 2012-12-14 2014-06-18 上海重型机器厂有限公司 Processing method for inner hole of elbow of nuclear power main pipeline
CN103521803B (en) * 2013-10-11 2017-01-11 一重集团绍兴重型机床有限公司 Inner hole machining device of pipeline arc bend
CN103521803A (en) * 2013-10-11 2014-01-22 一重集团绍兴重型机床有限公司 Inner hole machining device of pipeline arc bend
CN103506654B (en) * 2013-10-11 2016-04-20 一重集团绍兴重型机床有限公司 A kind of inner bore of pipeline organisation of working
CN103506654A (en) * 2013-10-11 2014-01-15 一重集团绍兴重型机床有限公司 Mechanism for machining holes inside pipeline
CN105215765A (en) * 2015-10-08 2016-01-06 四川大学 A kind of tubular body surface processing device
CN105834496A (en) * 2016-04-28 2016-08-10 齐齐哈尔精工伟业机床有限公司 Multifunctional milling machine for milling in large-diameter inner hole
CN106965019A (en) * 2017-04-13 2017-07-21 上海司恩金属加工技术有限公司 The special machine tool that a kind of crystallizer copper pipe embedded SMA actuators are used
CN107538053A (en) * 2017-09-15 2018-01-05 西安航空职业技术学院 A kind of circular arc elbow internal wall machining tool
CN108645337A (en) * 2018-04-27 2018-10-12 北京理工大学 A kind of depth inside pipe wall Surface Location Error on-line measurement and compensation method
CN108724300A (en) * 2018-05-24 2018-11-02 夏文斌 A kind of portable processing unit (plant) of heavy caliber PP pipes
CN108637277A (en) * 2018-07-15 2018-10-12 赖旭亮 It is bent class workpiece surface high-precision turning process and its process equipment
CN108637277B (en) * 2018-07-15 2023-06-30 赖旭亮 High-precision turning process and equipment for surface of curved workpiece
CN110405261A (en) * 2019-08-30 2019-11-05 南京信息职业技术学院 inner ring groove milling device
CN110732715A (en) * 2019-10-29 2020-01-31 庄小梅 numerical control cutting machine tool for hollow pipe internal cutting
CN114871790A (en) * 2022-04-21 2022-08-09 黄山和泰汇精密科技有限公司 Intelligent CNC machine tool based on digital control
CN114871790B (en) * 2022-04-21 2022-11-22 黄山和泰汇精密科技有限公司 Intelligent CNC machine tool based on digital control
CN118023595A (en) * 2024-04-12 2024-05-14 秦皇岛优益创联特种车辆制造有限公司 Rotatable milling machine

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